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SEGMENT REPORTING - Schedule of Segment Reporting, by Reportable Business Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 1,378,284 | $ 1,280,435 | $ 893,886
Interest expense | 529,094 | 445,391 | 92,860
Net interest income | 849,190 | 835,044 | 801,026
Provision for credit losses | 58,793 | 142,656 | 71,697
Noninterest income | 293,257 | 242,828 | 284,424
Noninterest expense |  |  |
Salaries and employee benefits | 347,641 | 320,110 | 319,719
Occupancy and equipment expenses | 48,784 | 51,450 | 51,361
Data processing and communications expenses | 59,699 | 53,486 | 49,228
Other expenses | 151,670 | 153,235 | 140,347
Total noninterest expense | 607,794 | 578,281 | 560,655
Income before income tax expense | 475,860 | 356,935 | 453,098
Income tax expense | 117,175 | 87,830 | 106,558
Net income | 358,685 | 269,105 | 346,540
Total assets | 26,262,050 | 25,203,699 | 25,053,286
Goodwill | 1,015,646 | 1,015,646 | 1,015,646
Other intangible assets, net | 70,761 | 87,949 | 106,194
Banking Division |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 962,918 | 913,439 | 648,309
Interest expense | 271,201 | 224,543 | (12,698)
Net interest income | 691,717 | 688,896 | 661,007
Provision for credit losses | 60,434 | 132,789 | 61,549
Noninterest income | 121,972 | 102,177 | 97,815
Noninterest expense |  |  |
Salaries and employee benefits | 243,795 | 228,399 | 202,128
Occupancy and equipment expenses | 44,568 | 46,232 | 45,441
Data processing and communications expenses | 54,121 | 48,155 | 44,073
Other expenses | 96,049 | 100,752 | 87,340
Total noninterest expense | 438,533 | 423,538 | 378,982
Income before income tax expense | 314,722 | 234,746 | 318,291
Income tax expense | 83,503 | 62,297 | 78,343
Net income | 231,219 | 172,449 | 239,948
Total assets | 18,954,256 | 18,291,626 | 18,105,049
Goodwill | 951,148 | 951,148 | 951,148
Other intangible assets, net | 67,721 | 81,959 | 97,254
Retail Mortgage Division |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 236,670 | 212,106 | 155,533
Interest expense | 142,374 | 123,804 | 76,339
Net interest income | 94,296 | 88,302 | 79,194
Provision for credit losses | (2,799) | 9,535 | 12,351
Noninterest income | 167,031 | 137,145 | 182,039
Noninterest expense |  |  |
Salaries and employee benefits | 92,436 | 80,317 | 107,810
Occupancy and equipment expenses | 3,965 | 4,899 | 5,579
Data processing and communications expenses | 5,048 | 4,836 | 4,580
Other expenses | 50,209 | 47,393 | 48,224
Total noninterest expense | 151,658 | 137,445 | 166,193
Income before income tax expense | 112,468 | 78,467 | 82,689
Income tax expense | 23,618 | 16,478 | 17,364
Net income | 88,850 | 61,989 | 65,325
Total assets | 4,828,842 | 4,916,753 | 4,739,612
Goodwill | 0 | 0 | 0
Other intangible assets, net | 0 | 0 | 0
Warehouse Lending Division |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 75,264 | 71,110 | 43,521
Interest expense | 48,492 | 47,271 | 16,794
Net interest income | 26,772 | 23,839 | 26,727
Provision for credit losses | 275 | (440) | (1,074)
Noninterest income | 4,209 | 3,475 | 4,537
Noninterest expense |  |  |
Salaries and employee benefits | 3,216 | 2,794 | 1,973
Occupancy and equipment expenses | 26 | 5 | 4
Data processing and communications expenses | 160 | 171 | 187
Other expenses | 976 | 873 | 830
Total noninterest expense | 4,378 | 3,843 | 2,994
Income before income tax expense | 26,328 | 23,911 | 29,344
Income tax expense | 5,529 | 5,021 | 6,162
Net income | 20,799 | 18,890 | 23,182
Total assets | 983,229 | 825,415 | 1,016,192
Goodwill | 0 | 0 | 0
Other intangible assets, net | 0 | 0 | 0
Premium Finance Division |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 103,432 | 83,780 | 46,523
Interest expense | 67,027 | 49,773 | 12,425
Net interest income | 36,405 | 34,007 | 34,098
Provision for credit losses | 883 | 772 | (1,129)
Noninterest income | 45 | 31 | 33
Noninterest expense |  |  |
Salaries and employee benefits | 8,194 | 8,600 | 7,808
Occupancy and equipment expenses | 225 | 314 | 337
Data processing and communications expenses | 370 | 324 | 388
Other expenses | 4,436 | 4,217 | 3,953
Total noninterest expense | 13,225 | 13,455 | 12,486
Income before income tax expense | 22,342 | 19,811 | 22,774
Income tax expense | 4,525 | 4,034 | 4,689
Net income | 17,817 | 15,777 | 18,085
Total assets | 1,495,723 | 1,169,905 | 1,192,433
Goodwill | 64,498 | 64,498 | 64,498
Other intangible assets, net | $ 3,040 | $ 5,990 | $ 8,940

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