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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Quarterly Financial Information Disclosure [Abstract]                              
Interest and dividend income $ 129,439 $ 123,592 $ 142,004 $ 128,357 $ 131,342 $ 125,833 $ 137,094 $ 124,789 $ 118,866 $ 104,696 $ 108,955 $ 89,433 $ 523,392 $ 519,058 $ 421,950
Interest expense 1,488 1,279 5,725 3,106 3,828 3,083 8,460 5,862 4,708 1,881 3,282 1,003 11,598 21,233 10,874
Net interest income 127,951 122,313 136,279 125,251 127,514 122,750 128,634 118,927 114,158 102,815 105,673 88,430 511,794 497,825 411,076
Provision for credit loss (6,431) 9,278 35,266 18,661 8,672 11,927 29,744 7,758 28,007 22,517 41,960 16,758 56,774 58,101 109,242
Noninterest income 58,756 73,442 138,524 57,378 52,010 65,871 128,945 52,761 56,051 67,733 127,038 65,777 328,100 299,587 316,599
Net income attributable to parent $ 38,801 $ 42,147 $ 74,957 $ 29,967 $ 33,533 $ 44,869 $ 69,918 $ 34,899 $ 25,277 $ 36,080 $ 54,119 $ 27,790 $ 185,872 $ 183,219 $ 143,266
Earnings per common share                              
Basic (in dollars per share) $ 1.69 $ 1.83 $ 3.16 $ 1.23 $ 1.34 $ 1.78 $ 2.74 $ 1.34 $ 0.96 $ 1.35 $ 1.97 $ 0.98 $ 7.91 $ 7.21 $ 5.26
Diluted (in dollars per share) 1.69 1.81 3.14 1.23 1.34 1.78 2.74 1.34 0.96 1.34 1.96 0.98 7.87 7.20 5.24
Dividend declared per share (in dollars per share) $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.20 $ 0.20 $ 0.20