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OPERATING SEGMENTS AND RELATED INFORMATION - Schedule of Financial Results by Operating Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Interest income | $ 244,505 | $ 134,606 | $ 658,766 | $ 392,365
Intersegment interest income | 0 | 0 | 0 | 0
Interest expense | 89,368 | 51,959 | 246,715 | 151,332
Intersegment interest expense | 0 | 0 | 0 | 0
Net interest income | 155,137 | 82,647 | 412,051 | 241,033
Provision for credit losses | (985) | 409 | 50,308 | 6,677
Net interest income after provision for credit losses | 156,122 | 82,238 | 361,743 | 234,356
Noninterest income |  |  |  |
All other noninterest income | 7,908 | 7,054 | 10,191 | 17,475
Intersegment noninterest income | 0 | 0 | 0 | 0
Total noninterest income | 41,198 | 35,845 | 107,284 | 104,461
Revenue | 196,335 | 118,492 | 519,335 | 345,494
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 74,145 | 44,593 | 220,068 | 130,161
Data processing | 9,714 | 6,910 | 33,310 | 20,560
Amortization of intangible assets | 4,507 | 2,548 | 12,182 | 7,586
Interchange expense | 1,336 | 1,352 | 3,976 | 4,696
All other noninterest expense | 30,316 | 20,116 | 90,345 | 59,869
Intersegment noninterest expense | 0 | 0 | 0 | 0
Total noninterest expense | 120,018 | 75,519 | 359,881 | 222,872
Income (loss) before income taxes | 77,302 | 42,564 | 109,146 | 115,945
Income taxes | 20,204 | 10,560 | 34,634 | 30,359
Net income | 57,098 | 32,004 | 74,512 | 85,586
Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 17,184 | 15,378 | 51,325 | 46,844
Payment technology solutions |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 5,092 | 5,265 | 15,121 | 16,889
Treasury management services |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,598 | 2,201 | 12,596 | 6,247
Card services and ATM fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,799 | 3,557 | 13,388 | 9,947
Other service charges on deposit accounts |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 1,617 | 2,390 | 4,663 | 7,059
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 1 | 8 | 6 | 29
Intersegment interest income | (16) | (12) | (46) | (361)
Interest expense | 2,844 | 4,348 | 11,427 | 13,272
Intersegment interest expense | (951) | (457) | (2,308) | (2,109)
Net interest income | (1,908) | (3,895) | (9,159) | (11,495)
Provision for credit losses | 0 | 0 | 0 | 0
Net interest income after provision for credit losses | (1,908) | (3,895) | (9,159) | (11,495)
Noninterest income |  |  |  |
All other noninterest income | 1,772 | 833 | 7,469 | 917
Intersegment noninterest income | (1,007) | (658) | (2,449) | (1,816)
Total noninterest income | 765 | 175 | 5,020 | (899)
Revenue | (1,143) | (3,720) | (4,139) | (12,394)
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 10,685 | 6,015 | 33,166 | 15,695
Data processing | 63 | 130 | 255 | 437
Amortization of intangible assets | 0 | 0 | 0 | 0
Interchange expense | 0 | 0 | 0 | 0
All other noninterest expense | 2,374 | 2,631 | 13,754 | 6,014
Intersegment noninterest expense | (5,635) | (4,014) | (17,743) | (12,008)
Total noninterest expense | 7,487 | 4,762 | 29,432 | 10,138
Income (loss) before income taxes | (8,630) | (8,482) | (33,571) | (22,532)
Income taxes | (2,760) | (1,708) | (7,711) | (5,478)
Net income | (5,870) | (6,774) | (25,860) | (17,054)
Other | Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Other | Payment technology solutions |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Other | Treasury management services |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Other | Card services and ATM fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Other | Other service charges on deposit accounts |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Banking | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 244,504 | 134,598 | 658,760 | 392,336
Intersegment interest income | 0 | 0 | 0 | 324
Interest expense | 86,524 | 47,611 | 235,288 | 138,060
Intersegment interest expense | 951 | 457 | 2,308 | 2,109
Net interest income | 157,029 | 86,530 | 421,164 | 252,491
Provision for credit losses | (985) | 409 | 50,308 | 6,677
Net interest income after provision for credit losses | 158,014 | 86,121 | 370,856 | 245,814
Noninterest income |  |  |  |
All other noninterest income | 5,957 | 5,431 | 2,134 | 15,414
Intersegment noninterest income | 564 | 372 | 1,232 | 1,004
Total noninterest income | 17,535 | 13,951 | 34,013 | 39,671
Revenue | 174,564 | 100,481 | 455,177 | 292,162
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 53,264 | 29,615 | 157,237 | 87,358
Data processing | 8,062 | 5,298 | 28,392 | 15,742
Amortization of intangible assets | 4,292 | 2,268 | 11,497 | 6,705
Interchange expense | 0 | 0 | 0 | 0
All other noninterest expense | 26,706 | 16,273 | 72,693 | 49,954
Intersegment noninterest expense | 4,346 | 2,879 | 14,167 | 8,605
Total noninterest expense | 96,670 | 56,333 | 283,986 | 168,364
Income (loss) before income taxes | 78,879 | 43,739 | 120,883 | 117,121
Income taxes | 21,283 | 10,518 | 37,142 | 30,711
Net income | 57,596 | 33,221 | 83,741 | 86,410
Banking | Operating Segments | Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Banking | Operating Segments | Payment technology solutions |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Banking | Operating Segments | Treasury management services |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,598 | 2,201 | 12,596 | 6,247
Banking | Operating Segments | Card services and ATM fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,799 | 3,557 | 13,388 | 9,947
Banking | Operating Segments | Other service charges on deposit accounts |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 1,617 | 2,390 | 4,663 | 7,059
Wealth Management | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 0 | 0 | 0 | 0
Intersegment interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Intersegment interest expense | 0 | 0 | 0 | 0
Net interest income | 0 | 0 | 0 | 0
Provision for credit losses | 0 | 0 | 0 | 0
Net interest income after provision for credit losses | 0 | 0 | 0 | 0
Noninterest income |  |  |  |
All other noninterest income | 183 | 791 | 594 | 1,145
Intersegment noninterest income | 0 | 0 | 0 | 0
Total noninterest income | 17,367 | 16,169 | 51,919 | 47,989
Revenue | 17,367 | 16,169 | 51,919 | 47,989
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 7,576 | 6,606 | 21,713 | 19,831
Data processing | 658 | 544 | 1,873 | 1,591
Amortization of intangible assets | 215 | 280 | 685 | 881
Interchange expense | 0 | 0 | 0 | 0
All other noninterest expense | 562 | 573 | 1,889 | 2,079
Intersegment noninterest expense | 885 | 774 | 2,443 | 2,322
Total noninterest expense | 9,896 | 8,777 | 28,603 | 26,704
Income (loss) before income taxes | 7,471 | 7,392 | 23,316 | 21,285
Income taxes | 1,793 | 1,774 | 5,596 | 5,108
Net income | 5,678 | 5,618 | 17,720 | 16,177
Wealth Management | Operating Segments | Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 17,184 | 15,378 | 51,325 | 46,844
Wealth Management | Operating Segments | Payment technology solutions |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Wealth Management | Operating Segments | Treasury management services |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Wealth Management | Operating Segments | Card services and ATM fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
Wealth Management | Operating Segments | Other service charges on deposit accounts |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
FirsTech | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 0 | 0 | 0 | 0
Intersegment interest income | 16 | 12 | 46 | 37
Interest expense | 0 | 0 | 0 | 0
Intersegment interest expense | 0 | 0 | 0 | 0
Net interest income | 16 | 12 | 46 | 37
Provision for credit losses | 0 | 0 | 0 | 0
Net interest income after provision for credit losses | 16 | 12 | 46 | 37
Noninterest income |  |  |  |
All other noninterest income | (4) | (1) | (6) | (1)
Intersegment noninterest income | 443 | 286 | 1,217 | 812
Total noninterest income | 5,531 | 5,550 | 16,332 | 17,700
Revenue | 5,547 | 5,562 | 16,378 | 17,737
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 2,620 | 2,357 | 7,952 | 7,277
Data processing | 931 | 938 | 2,790 | 2,790
Amortization of intangible assets | 0 | 0 | 0 | 0
Interchange expense | 1,336 | 1,352 | 3,976 | 4,696
All other noninterest expense | 674 | 639 | 2,009 | 1,822
Intersegment noninterest expense | 404 | 361 | 1,133 | 1,081
Total noninterest expense | 5,965 | 5,647 | 17,860 | 17,666
Income (loss) before income taxes | (418) | (85) | (1,482) | 71
Income taxes | (112) | (24) | (393) | 18
Net income | (306) | (61) | (1,089) | 53
FirsTech | Operating Segments | Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
FirsTech | Operating Segments | Payment technology solutions |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 5,092 | 5,265 | 15,121 | 16,889
FirsTech | Operating Segments | Treasury management services |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
FirsTech | Operating Segments | Card services and ATM fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
FirsTech | Operating Segments | Other service charges on deposit accounts |  |  |  |
Noninterest income |  |  |  |
Noninterest income | $ 0 | $ 0 | $ 0 | $ 0

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