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SEGMENT REPORTING - Schedule of Segment Reporting, by Reportable Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | $ 355,046 | $ 355,146 | $ 1,036,462 | $ 1,031,921 |
Interest expense | 117,082 | 141,086 | 344,846 | 404,552 |
Net interest income | 237,964 | 214,060 | 691,616 | 627,369 |
Provision for credit losses | 22,630 | 6,107 | 47,294 | 45,985 |
Noninterest income | 76,274 | 69,709 | 209,208 | 224,298 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 90,948 | 88,700 | 266,871 | 259,831 |
Occupancy and equipment | 11,524 | 11,716 | 33,602 | 37,160 |
Data processing and communications expenses | 16,058 | 15,221 | 46,279 | 45,068 |
Other expenses | 36,036 | 36,140 | 114,108 | 113,786 |
Total noninterest expense | 154,566 | 151,777 | 460,860 | 455,845 |
Income before income tax expense | 137,042 | 125,885 | 392,670 | 349,837 |
Income tax expense | 31,013 | 26,673 | 88,872 | 85,528 |
Net income | 106,029 | 99,212 | 303,798 | 264,309 |
Total assets | 27,099,829 | 26,399,782 | 27,099,829 | 26,399,782 | $ 26,262,050
Goodwill | 1,015,646 | 1,015,646 | 1,015,646 | 1,015,646 | 1,015,646
Other intangible assets, net | 58,703 | 74,941 | 58,703 | 74,941 | $ 70,761
Banking Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 245,322 | 243,964 | 717,852 | 722,943 |
Interest expense | 47,262 | 71,329 | 144,078 | 212,303 |
Net interest income | 198,060 | 172,635 | 573,774 | 510,640 |
Provision for credit losses | 21,617 | 5,566 | 38,714 | 45,581 |
Noninterest income | 35,419 | 26,435 | 93,418 | 90,325 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 66,301 | 62,634 | 191,018 | 181,473 |
Occupancy and equipment | 10,718 | 10,725 | 31,069 | 33,952 |
Data processing and communications expenses | 14,668 | 13,922 | 41,884 | 40,862 |
Other expenses | 22,286 | 22,619 | 73,449 | 71,680 |
Total noninterest expense | 113,973 | 109,900 | 337,420 | 327,967 |
Income before income tax expense | 97,889 | 83,604 | 291,058 | 227,417 |
Income tax expense | 22,824 | 17,832 | 67,645 | 59,950 |
Net income | 75,065 | 65,772 | 223,413 | 167,467 |
Total assets | 19,510,473 | 18,983,335 | 19,510,473 | 18,983,335 |
Goodwill | 951,148 | 951,148 | 951,148 | 951,148 |
Other intangible assets, net | 57,773 | 71,164 | 57,773 | 71,164 |
Retail Mortgage Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 60,261 | 60,789 | 179,549 | 174,889 |
Interest expense | 40,082 | 37,236 | 115,495 | 104,307 |
Net interest income | 20,179 | 23,553 | 64,054 | 70,582 |
Provision for credit losses | 529 | 254 | 6,730 | (296) |
Noninterest income | 40,081 | 41,498 | 112,536 | 130,408 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 21,589 | 23,233 | 66,942 | 69,560 |
Occupancy and equipment | 760 | 957 | 2,400 | 3,014 |
Data processing and communications expenses | 1,232 | 1,184 | 3,920 | 3,826 |
Other expenses | 12,480 | 12,164 | 36,939 | 38,091 |
Total noninterest expense | 36,061 | 37,538 | 110,201 | 114,491 |
Income before income tax expense | 23,670 | 27,259 | 59,659 | 86,795 |
Income tax expense | 4,970 | 5,724 | 12,528 | 18,227 |
Net income | 18,700 | 21,535 | 47,131 | 68,568 |
Total assets | 4,693,083 | 4,899,282 | 4,693,083 | 4,899,282 |
Goodwill | 0 | 0 | 0 | 0 |
Other intangible assets, net | 0 | 0 | 0 | 0 |
Warehouse Lending Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 18,803 | 21,677 | 52,177 | 57,540 |
Interest expense | 11,329 | 13,865 | 31,710 | 37,408 |
Net interest income | 7,474 | 7,812 | 20,467 | 20,132 |
Provision for credit losses | 23 | (170) | 217 | 334 |
Noninterest income | 756 | 1,765 | 3,203 | 3,533 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 566 | 621 | 1,736 | 2,633 |
Occupancy and equipment | 7 | 6 | 21 | 20 |
Data processing and communications expenses | 57 | 32 | 154 | 116 |
Other expenses | 195 | 217 | 561 | 752 |
Total noninterest expense | 825 | 876 | 2,472 | 3,521 |
Income before income tax expense | 7,382 | 8,871 | 20,981 | 19,810 |
Income tax expense | 1,550 | 1,863 | 4,406 | 4,160 |
Net income | 5,832 | 7,008 | 16,575 | 15,650 |
Total assets | 1,105,821 | 1,001,666 | 1,105,821 | 1,001,666 |
Goodwill | 0 | 0 | 0 | 0 |
Other intangible assets, net | 0 | 0 | 0 | 0 |
Premium Finance Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 30,660 | 28,716 | 86,884 | 76,549 |
Interest expense | 18,409 | 18,656 | 53,563 | 50,534 |
Net interest income | 12,251 | 10,060 | 33,321 | 26,015 |
Provision for credit losses | 461 | 457 | 1,633 | 366 |
Noninterest income | 18 | 11 | 51 | 32 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 2,492 | 2,212 | 7,175 | 6,165 |
Occupancy and equipment | 39 | 28 | 112 | 174 |
Data processing and communications expenses | 101 | 83 | 321 | 264 |
Other expenses | 1,075 | 1,140 | 3,159 | 3,263 |
Total noninterest expense | 3,707 | 3,463 | 10,767 | 9,866 |
Income before income tax expense | 8,101 | 6,151 | 20,972 | 15,815 |
Income tax expense | 1,669 | 1,254 | 4,293 | 3,191 |
Net income | 6,432 | 4,897 | 16,679 | 12,624 |
Total assets | 1,790,452 | 1,515,499 | 1,790,452 | 1,515,499 |
Goodwill | 64,498 | 64,498 | 64,498 | 64,498 |
Other intangible assets, net | $ 930 | $ 3,777 | $ 930 | $ 3,777 |

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