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Quarterly Financial Data (Unaudited) - Summary of Quarterly Operating Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | $ 107,052 | $ 97,482 | $ 77,174
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 26,916 | 24,700 | 14,791
Net interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 80,136 | 72,782 | 62,383
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 6,002 | 2,032 | 3,047
Noninterest income |  |  |  |  |  |  |  |  |  |  |  |  | 14,750 | 13,093 | 12,369
Noninterest expense |  |  |  |  |  |  |  |  |  |  |  |  | 54,452 | 47,892 | 42,973
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 6,887 | 7,047 | 7,803
NET INCOME |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,545 | $ 28,904 | $ 20,929
Quarterly Operating Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 27,264 | $ 26,220 | $ 26,646 | $ 26,922 | $ 26,047 | $ 25,186 | $ 24,207 | $ 22,042 | $ 20,147 | $ 19,385 | $ 19,231 | $ 18,411 |  |  |
Interest expense | 5,483 | 6,802 | 7,269 | 7,362 | 7,054 | 6,632 | 6,139 | 4,875 | 4,245 | 3,710 | 3,528 | 3,308 |  |  |
Net interest expense | 21,781 | 19,418 | 19,377 | 19,560 | 18,993 | 18,554 | 18,068 | 17,167 | 15,902 | 15,675 | 15,703 | 15,103 |  |  |
Provision for loan losses | 1,868 | 2,850 | 388 | 896 | 545 | 491 | 314 | 682 | 987 | 550 | 642 | 868 |  |  |
Noninterest income | 4,358 | 3,229 | 3,674 | 3,489 | 3,158 | 3,423 | 3,568 | 2,944 | 3,134 | 3,506 | 2,811 | 2,918 |  |  |
Noninterest expense | 15,509 | 13,569 | 13,025 | 12,349 | 12,196 | 12,667 | 12,066 | 10,963 | 10,852 | 11,563 | 10,156 | 10,402 |  |  |
Income before income taxes | 8,762 | 6,228 | 9,638 | 9,804 | 9,410 | 8,819 | 9,256 | 8,466 | 7,197 | 7,068 | 7,716 | 6,751 |  |  |
Income tax expense | 1,861 | 1,129 | 1,921 | 1,976 | 1,854 | 1,725 | 1,802 | 1,666 | 1,558 | 1,810 | 2,546 | 1,889 |  |  |
NET INCOME | $ 6,901 | $ 5,099 | $ 7,717 | $ 7,828 | $ 7,556 | $ 7,094 | $ 7,454 | $ 6,800 | $ 5,639 | $ 5,258 | $ 5,170 | $ 4,862 |  |  |

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