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SEGMENT REPORTING - Schedule of Segment Reporting, by Reportable Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | $ 347,323 | $ 321,952 | $ 676,775 | $ 617,668 |
Interest expense | 135,402 | 112,412 | 263,466 | 196,476 |
Net interest income | 211,921 | 209,540 | 413,309 | 421,192 |
Provision for credit losses | 18,773 | 45,516 | 39,878 | 95,245 |
Noninterest income | 88,711 | 67,349 | 154,589 | 123,399 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 88,201 | 81,336 | 171,131 | 162,246 |
Occupancy and equipment | 12,559 | 12,522 | 25,444 | 25,508 |
Data processing and communications expenses | 15,193 | 13,451 | 29,847 | 26,485 |
Other expenses | 39,404 | 41,094 | 77,646 | 73,585 |
Total noninterest expense | 155,357 | 148,403 | 304,068 | 287,824 |
Income before income tax expense | 126,502 | 82,970 | 223,952 | 161,522 |
Income tax expense | 35,717 | 20,335 | 58,855 | 38,466 |
Net income | 90,785 | 62,635 | 165,097 | 123,056 |
Total assets | 26,520,728 | 25,800,618 | 26,520,728 | 25,800,618 | $ 25,203,699
Goodwill | 1,015,646 | 1,015,646 | 1,015,646 | 1,015,646 | 1,015,646
Other intangible assets, net | 79,120 | 96,800 | 79,120 | 96,800 | $ 87,949
Banking Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 243,857 | 230,199 | 478,979 | 442,789 |
Interest expense | 70,320 | 56,427 | 140,974 | 91,732 |
Net interest income | 173,537 | 173,772 | 338,005 | 351,057 |
Provision for credit losses | 20,888 | 41,255 | 40,015 | 88,291 |
Noninterest income | 37,527 | 26,128 | 63,890 | 50,631 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 59,923 | 56,512 | 118,839 | 114,263 |
Occupancy and equipment | 11,474 | 11,215 | 23,227 | 22,858 |
Data processing and communications expenses | 13,756 | 11,944 | 26,940 | 23,778 |
Other expenses | 24,614 | 27,976 | 49,061 | 47,421 |
Total noninterest expense | 109,767 | 107,647 | 218,067 | 208,320 |
Income before income tax expense | 80,409 | 50,998 | 143,813 | 105,077 |
Income tax expense | 26,090 | 13,658 | 42,118 | 26,687 |
Net income | 54,319 | 37,340 | 101,695 | 78,390 |
Total assets | 18,933,072 | 18,532,088 | 18,933,072 | 18,532,088 |
Goodwill | 951,148 | 951,148 | 951,148 | 951,148 |
Other intangible assets, net | 74,605 | 89,335 | 74,605 | 89,335 |
Retail Mortgage Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 59,001 | 52,867 | 114,100 | 101,456 |
Interest expense | 35,259 | 31,450 | 67,071 | 60,012 |
Net interest income | 23,742 | 21,417 | 47,029 | 41,444 |
Provision for credit losses | (2,882) | 3,278 | (550) | 6,131 |
Noninterest income | 50,145 | 39,808 | 88,910 | 70,866 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 25,254 | 21,930 | 46,327 | 42,090 |
Occupancy and equipment | 1,008 | 1,224 | 2,057 | 2,507 |
Data processing and communications expenses | 1,276 | 1,397 | 2,642 | 2,466 |
Other expenses | 13,397 | 11,859 | 25,927 | 23,606 |
Total noninterest expense | 40,935 | 36,410 | 76,953 | 70,669 |
Income before income tax expense | 35,834 | 21,537 | 59,536 | 35,510 |
Income tax expense | 7,525 | 4,523 | 12,503 | 7,457 |
Net income | 28,309 | 17,014 | 47,033 | 28,053 |
Total assets | 5,100,837 | 4,921,354 | 5,100,837 | 4,921,354 |
Goodwill | 0 | 0 | 0 | 0 |
Other intangible assets, net | 0 | 0 | 0 | 0 |
Warehouse Lending Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 19,380 | 18,960 | 35,863 | 35,574 |
Interest expense | 13,088 | 12,794 | 23,543 | 23,708 |
Net interest income | 6,292 | 6,166 | 12,320 | 11,866 |
Provision for credit losses | 359 | 411 | 504 | 217 |
Noninterest income | 1,028 | 1,404 | 1,768 | 1,884 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 1,124 | 772 | 2,012 | 1,574 |
Occupancy and equipment | 7 | 0 | 14 | 1 |
Data processing and communications expenses | 59 | 44 | 84 | 90 |
Other expenses | 298 | 223 | 535 | 425 |
Total noninterest expense | 1,488 | 1,039 | 2,645 | 2,090 |
Income before income tax expense | 5,473 | 6,120 | 10,939 | 11,443 |
Income tax expense | 1,149 | 1,285 | 2,297 | 2,403 |
Net income | 4,324 | 4,835 | 8,642 | 9,040 |
Total assets | 1,089,263 | 1,152,690 | 1,089,263 | 1,152,690 |
Goodwill | 0 | 0 | 0 | 0 |
Other intangible assets, net | 0 | 0 | 0 | 0 |
Premium Finance Division |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income | 25,085 | 19,926 | 47,833 | 37,849 |
Interest expense | 16,735 | 11,741 | 31,878 | 21,024 |
Net interest income | 8,350 | 8,185 | 15,955 | 16,825 |
Provision for credit losses | 408 | 572 | (91) | 606 |
Noninterest income | 11 | 9 | 21 | 18 |
Noninterest expense |  |  |  |  |
Salaries and employee benefits | 1,900 | 2,122 | 3,953 | 4,319 |
Occupancy and equipment | 70 | 83 | 146 | 142 |
Data processing and communications expenses | 102 | 66 | 181 | 151 |
Other expenses | 1,095 | 1,036 | 2,123 | 2,133 |
Total noninterest expense | 3,167 | 3,307 | 6,403 | 6,745 |
Income before income tax expense | 4,786 | 4,315 | 9,664 | 9,492 |
Income tax expense | 953 | 869 | 1,937 | 1,919 |
Net income | 3,833 | 3,446 | 7,727 | 7,573 |
Total assets | 1,397,556 | 1,194,486 | 1,397,556 | 1,194,486 |
Goodwill | 64,498 | 64,498 | 64,498 | 64,498 |
Other intangible assets, net | $ 4,515 | $ 7,465 | $ 4,515 | $ 7,465 |

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