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Abstract
This study aims to examine the non-linear impact of bank size on the profitability of Islamic rural banks (IRBs). Our study selected 90 banks situated on the Java Island. The study period spans 2018-2021, with quarterly data. Our study employs a dynamic panel regression using the GMM method. The results indicate that assets positively affect profitability. More importantly, the impact of an asset on profitability is inverted. In addition, these findings suggest that strong bank fundamentals, derived from high efficiency and high CAR, positively impact profitability. Several policy implications can be drawn from our findings. First, each bank must have a minimum of assets to achieve high profitability, around 187 billion. Second, to increase their profitability, Islamic rural banks must have adequate capital and a high operating efficiency.
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Copyright (c) 2025 Zul Hendri, Eka Wulandari, Mohd Sollehudin Shuib

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References
- Arellano, M., & Bond, S. (1991). Some Tests of Specification for Panel Data: Monte Carlo Evidence and an Application to Employment Equations. The Review of Economic Studies, 58(2), 277–279. https://doi.org/10.2307/2297968
- Arellano, M., & Bover, O. (1995). Another look at the instrumental variable estimation of error-components models. Journal of Econometrics, 68(1), 29–51. https://doi.org/10.1016/0304-4076(94)01642-D
- Blundell, R., & Bond, S. (1998). Initial conditions and moment restrictions in dynamic panel data models. Journal of Econometrics, 87(1), 115–143. https://doi.org/10.1016/S0304-4076(98)00009-8
- Hidayah, N., & Karimah, N. A. (2023). Are Sharia Financing Schemes Profitable? the Case of Islamic Rural Banks in Indonesia. EL DINAR: Jurnal Keuangan Dan Perbankan Syariah, 11(1), 58–76. https://doi.org/10.18860/ed.v11i1.19561
- Ibrahim, M. H., Aun, S., & Rizvi, R. (2017). Do we need bigger Islamic banks ? An assessment of bank stability. Journal of Multinational Financial Management, 40, 77–91. https://doi.org/10.1016/j.mulfin.2017.05.002
- Jusuf, N., & Widarjono, A. (2024). Funding Liquidity risk, Bank-Specific Variables and Profitability of Islamic Rural Banks. Iqtishaduna: Jurnal Ilmiah Ekonomi Kita, 13(2), 434–450. https://doi.org/10.46367/iqtishaduna.v13i2.2227
- Khattak, M. A., Ali, M., Khan, N. A., & Ahmad, F. (2022). the Adjusted Market Power, Competition, and Performance: Islamic Vs Conventional Banks. Journal of Islamic Monetary Economics and Finance, 8(4), 577–598. https://doi.org/10.21098/jimf.v8i4.1532
- Lubis, D., Anjani, D. A., & Nursyamsiah, T. (2023). Determinants of the Profitability of Islamic Rural Banks during Covid-19 in Indonesia. Journal of Islamic Economics and Finance Studies, 4(1), 48–65.
- Meslier, C., Risfandy, T., & Tarazi, A. (2020). Islamic banks’ equity financing, Shariah supervisory board, and banking environments. Pacific Basin Finance Journal, 62(4), 101354. https://doi.org/10.1016/j.pacfin.2020.101354
- Misanam, M., & Widarjono, A. (2023). Market Concentration, Bank Characteristics, Macroeconomic Conditions, and Indonesian Islamic Bank Financing. Muqtasid: Jurnal Ekonomi Dan Perbankan Syariah, 14(2), 165–184. https://doi.org/10.18326/muqtasid.v14i2.165-184
- Putri, D. W. E. P., & Widarjono, A. (2023). Effect of Stability and Funding Risk on Shariah Rural Bank’s Profitability. Jurnal Ekonomi Syariah Teori Dan Terapan, 10(6), 620–631. https://doi.org/10.20473/vol10iss20236pp620-631
- Risfandy, T. (2018). Equity Financing and Islamic Banks’ Profitability: Evidence from the Biggest Muslim Country. Jurnal Keuangan Dan Perbankan, 22(3), 496–505. https://doi.org/10.26905/jkdp.v22i3.2150
- Risfandy, T., & Pratiwi, D. I. (2022). The Performance of Indonesian Islamic Rural Banks During Covid-19 Outbreak: the Role of Diversification. Journal of Islamic Monetary Economics and Finance, 8(3), 455–470. https://doi.org/10.21098/jimf.v8i3.1564
- Rizvi, S. A. R., Narayan, P. K., Sakti, A., & Syarifuddin, F. (2020). Role of Islamic banks in Indonesian banking industry: an empirical exploration. Pacific Basin Finance Journal, 62(4), 101117. https://doi.org/10.1016/j.pacfin.2019.02.002
- Sudarsono, H., Afriadi, F., & Suciningtias, S. A. (2021). Do stability and size affect the profitability of Islamic rural bank in Indonesia? Jurnal Ekonomi & Keuangan Islam, 7(2), 161–174. https://doi.org/10.20885/jeki.vol7.iss2.art5
- Sudarsono, H., Sholihin, M., & Susamto, A. A. (2024). Bank ownership and credit risk: an empirical study of Indonesian Islamic local banks. Journal of Islamic Accounting and Business Research. https://doi.org/10.1108/JIABR-02-2023-0069
- Sunarsih, Al Hashfi, R. U., Munawaroh, U., & Suhari, E. (2022). Nexus of Risk and Stability in Islamic Banks During the Pandemic: Evidence From Indonesia. Journal of Islamic Monetary Economics and Finance, 8(4), 599–614. https://doi.org/10.21098/jimf.v8i4.1444
- Sutrisno, Mr. (2018). Factors determinant of bank capital buffer: empirical study on islamic rural banking in Indonesia. Advance in Social Science, Education, Humanities Research, 186(Insyma), 84–87. https://doi.org/10.2991/insyma-18.2018.21
- Sutrisno, S., & Widarjono, A. (2022). Is Profit – Loss- Sharing Financing Matter for Islamic Bank ’ s Profitability ? The Indonesian Case. Risks, 10(11), 1–13. https://doi.org/https://doi.org/10.3390/risks10110207
- Sutrisno, S., Widarjono, A., & Mohamad, M. (2023). Does Financing Diversification Improve Bank Risk? Evidence From Indonesian Islamic Rural Banks. International Journal of Economics and Finance Studies, 15(4), 103–124. https://doi.org/10.34109/ijefs.202315406
- Trinugroho, I., Risfandy, T., & Ariefianto, M. D. (2018). Competition , diversification , and bank margins : Evidence from Indonesian Islamic rural banks. Borsa Istanbul Review, 18(4), 349–358. https://doi.org/10.1016/j.bir.2018.07.006
- Trinugroho, I., Santoso, W., Irawanto, R., & Pamungkas, P. (2021). Is spin-off policy an effective way to improve performance of Islamic banks? Evidence from Indonesia. Research in International Business and Finance, 56(2). https://doi.org/10.1016/j.ribaf.2020.101352
- Wastuti, W., Husin, H. A., & Fitrijanto, A. (2025). The Determinants of Islamic Rural Banks’ Efficiency in Indonesia. International Journal of Islamic Economics and Finance (IJIEF), 8(1), 58–81. https://doi.org/10.18196/ijief.v7i2.21491
- Widarjono, A., Alam, M. M., Rafik, A., Afandi, A., & Sidiq, S. (2025). Nexus between competition, concentration and bank risk-taking in Indonesian Islamic banking. International Journal of Islamic and Middle Eastern Finance and Management, 18(3), 672–690. https://doi.org/10.1108/IMEFM-02-2024-0099
- Widarjono, A., & Anto, M. B. H. (2020). Does market structure matter for Islamic rural banks’ profitability? Jurnal Keuangan Dan Perbankan, 24(4), 393–406. https://doi.org/10.26905/jkdp.v24i4.4810
- Widarjono, A., Mifrahi, M. N., & Perdana, A. R. A. (2020). Determinants of Indonesian Islamic Rural Banks’ Profitability: Collusive or Non-Collusive Behavior? Journal of Asian Finance, Economics and Business, 7(11), 657–668. https://doi.org/10.13106/jafeb.2020.vol7.no11.657
- Yanikkaya, H., Gümüş, N., & Pabuçcu, Y. U. (2018). How profitability differs between conventional and Islamic banks: A dynamic panel data approach. Pacific Basin Finance Journal, 48(February), 99–111. https://doi.org/10.1016/j.pacfin.2018.01.006
References
Arellano, M., & Bond, S. (1991). Some Tests of Specification for Panel Data: Monte Carlo Evidence and an Application to Employment Equations. The Review of Economic Studies, 58(2), 277–279. https://doi.org/10.2307/2297968
Arellano, M., & Bover, O. (1995). Another look at the instrumental variable estimation of error-components models. Journal of Econometrics, 68(1), 29–51. https://doi.org/10.1016/0304-4076(94)01642-D
Blundell, R., & Bond, S. (1998). Initial conditions and moment restrictions in dynamic panel data models. Journal of Econometrics, 87(1), 115–143. https://doi.org/10.1016/S0304-4076(98)00009-8
Hidayah, N., & Karimah, N. A. (2023). Are Sharia Financing Schemes Profitable? the Case of Islamic Rural Banks in Indonesia. EL DINAR: Jurnal Keuangan Dan Perbankan Syariah, 11(1), 58–76. https://doi.org/10.18860/ed.v11i1.19561
Ibrahim, M. H., Aun, S., & Rizvi, R. (2017). Do we need bigger Islamic banks ? An assessment of bank stability. Journal of Multinational Financial Management, 40, 77–91. https://doi.org/10.1016/j.mulfin.2017.05.002
Jusuf, N., & Widarjono, A. (2024). Funding Liquidity risk, Bank-Specific Variables and Profitability of Islamic Rural Banks. Iqtishaduna: Jurnal Ilmiah Ekonomi Kita, 13(2), 434–450. https://doi.org/10.46367/iqtishaduna.v13i2.2227
Khattak, M. A., Ali, M., Khan, N. A., & Ahmad, F. (2022). the Adjusted Market Power, Competition, and Performance: Islamic Vs Conventional Banks. Journal of Islamic Monetary Economics and Finance, 8(4), 577–598. https://doi.org/10.21098/jimf.v8i4.1532
Lubis, D., Anjani, D. A., & Nursyamsiah, T. (2023). Determinants of the Profitability of Islamic Rural Banks during Covid-19 in Indonesia. Journal of Islamic Economics and Finance Studies, 4(1), 48–65.
Meslier, C., Risfandy, T., & Tarazi, A. (2020). Islamic banks’ equity financing, Shariah supervisory board, and banking environments. Pacific Basin Finance Journal, 62(4), 101354. https://doi.org/10.1016/j.pacfin.2020.101354
Misanam, M., & Widarjono, A. (2023). Market Concentration, Bank Characteristics, Macroeconomic Conditions, and Indonesian Islamic Bank Financing. Muqtasid: Jurnal Ekonomi Dan Perbankan Syariah, 14(2), 165–184. https://doi.org/10.18326/muqtasid.v14i2.165-184
Putri, D. W. E. P., & Widarjono, A. (2023). Effect of Stability and Funding Risk on Shariah Rural Bank’s Profitability. Jurnal Ekonomi Syariah Teori Dan Terapan, 10(6), 620–631. https://doi.org/10.20473/vol10iss20236pp620-631
Risfandy, T. (2018). Equity Financing and Islamic Banks’ Profitability: Evidence from the Biggest Muslim Country. Jurnal Keuangan Dan Perbankan, 22(3), 496–505. https://doi.org/10.26905/jkdp.v22i3.2150
Risfandy, T., & Pratiwi, D. I. (2022). The Performance of Indonesian Islamic Rural Banks During Covid-19 Outbreak: the Role of Diversification. Journal of Islamic Monetary Economics and Finance, 8(3), 455–470. https://doi.org/10.21098/jimf.v8i3.1564
Rizvi, S. A. R., Narayan, P. K., Sakti, A., & Syarifuddin, F. (2020). Role of Islamic banks in Indonesian banking industry: an empirical exploration. Pacific Basin Finance Journal, 62(4), 101117. https://doi.org/10.1016/j.pacfin.2019.02.002
Sudarsono, H., Afriadi, F., & Suciningtias, S. A. (2021). Do stability and size affect the profitability of Islamic rural bank in Indonesia? Jurnal Ekonomi & Keuangan Islam, 7(2), 161–174. https://doi.org/10.20885/jeki.vol7.iss2.art5
Sudarsono, H., Sholihin, M., & Susamto, A. A. (2024). Bank ownership and credit risk: an empirical study of Indonesian Islamic local banks. Journal of Islamic Accounting and Business Research. https://doi.org/10.1108/JIABR-02-2023-0069
Sunarsih, Al Hashfi, R. U., Munawaroh, U., & Suhari, E. (2022). Nexus of Risk and Stability in Islamic Banks During the Pandemic: Evidence From Indonesia. Journal of Islamic Monetary Economics and Finance, 8(4), 599–614. https://doi.org/10.21098/jimf.v8i4.1444
Sutrisno, Mr. (2018). Factors determinant of bank capital buffer: empirical study on islamic rural banking in Indonesia. Advance in Social Science, Education, Humanities Research, 186(Insyma), 84–87. https://doi.org/10.2991/insyma-18.2018.21
Sutrisno, S., & Widarjono, A. (2022). Is Profit – Loss- Sharing Financing Matter for Islamic Bank ’ s Profitability ? The Indonesian Case. Risks, 10(11), 1–13. https://doi.org/https://doi.org/10.3390/risks10110207
Sutrisno, S., Widarjono, A., & Mohamad, M. (2023). Does Financing Diversification Improve Bank Risk? Evidence From Indonesian Islamic Rural Banks. International Journal of Economics and Finance Studies, 15(4), 103–124. https://doi.org/10.34109/ijefs.202315406
Trinugroho, I., Risfandy, T., & Ariefianto, M. D. (2018). Competition , diversification , and bank margins : Evidence from Indonesian Islamic rural banks. Borsa Istanbul Review, 18(4), 349–358. https://doi.org/10.1016/j.bir.2018.07.006
Trinugroho, I., Santoso, W., Irawanto, R., & Pamungkas, P. (2021). Is spin-off policy an effective way to improve performance of Islamic banks? Evidence from Indonesia. Research in International Business and Finance, 56(2). https://doi.org/10.1016/j.ribaf.2020.101352
Wastuti, W., Husin, H. A., & Fitrijanto, A. (2025). The Determinants of Islamic Rural Banks’ Efficiency in Indonesia. International Journal of Islamic Economics and Finance (IJIEF), 8(1), 58–81. https://doi.org/10.18196/ijief.v7i2.21491
Widarjono, A., Alam, M. M., Rafik, A., Afandi, A., & Sidiq, S. (2025). Nexus between competition, concentration and bank risk-taking in Indonesian Islamic banking. International Journal of Islamic and Middle Eastern Finance and Management, 18(3), 672–690. https://doi.org/10.1108/IMEFM-02-2024-0099
Widarjono, A., & Anto, M. B. H. (2020). Does market structure matter for Islamic rural banks’ profitability? Jurnal Keuangan Dan Perbankan, 24(4), 393–406. https://doi.org/10.26905/jkdp.v24i4.4810
Widarjono, A., Mifrahi, M. N., & Perdana, A. R. A. (2020). Determinants of Indonesian Islamic Rural Banks’ Profitability: Collusive or Non-Collusive Behavior? Journal of Asian Finance, Economics and Business, 7(11), 657–668. https://doi.org/10.13106/jafeb.2020.vol7.no11.657
Yanikkaya, H., Gümüş, N., & Pabuçcu, Y. U. (2018). How profitability differs between conventional and Islamic banks: A dynamic panel data approach. Pacific Basin Finance Journal, 48(February), 99–111. https://doi.org/10.1016/j.pacfin.2018.01.006