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OPERATING SEGMENTS AND RELATED INFORMATION - Schedule of Financial Results by Operating Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Interest income | $ 247,446 | $ 131,939 | $ 414,261 | $ 257,759
Intersegment interest income | 0 | 0 | 0 | 0
Interest expense | 94,263 | 49,407 | 157,347 | 99,373
Intersegment interest expense | 0 | 0 | 0 | 0
Net interest income | 153,183 | 82,532 | 256,914 | 158,386
Provision for credit losses | 5,700 | 1,908 | 51,293 | 6,268
Net interest income after provision for credit losses | 147,483 | 80,624 | 205,621 | 152,118
Noninterest income |  |  |  |
All other noninterest income | 11,756 | 3,975 | 2,283 | 10,421
Intersegment noninterest income | 0 | 0 | 0 | 0
Total noninterest income | 44,863 | 33,703 | 66,086 | 68,616
Revenue | 198,046 | 116,235 | 323,000 | 227,002
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 78,360 | 43,478 | 145,923 | 85,568
Data processing | 14,021 | 7,100 | 23,596 | 13,650
Amortization of intangible assets | 4,592 | 2,629 | 7,675 | 5,038
Interchange expense | 1,297 | 1,733 | 2,640 | 3,344
All other noninterest expense | 29,563 | 20,966 | 60,029 | 39,753
Intersegment noninterest expense | 0 | 0 | 0 | 0
Total noninterest expense | 127,833 | 75,906 | 239,863 | 147,353
Income (loss) before income taxes | 64,513 | 38,421 | 31,844 | 73,381
Income taxes | 17,109 | 11,064 | 14,430 | 19,799
Net income | 47,404 | 27,357 | 17,414 | 53,582
Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 16,777 | 15,917 | 34,141 | 31,466
Payment technology solutions |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,956 | 5,915 | 10,029 | 11,624
Treasury management services |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,981 | 2,145 | 7,998 | 4,046
Card services and ATM fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,880 | 3,430 | 8,589 | 6,390
Other service charges on deposit accounts |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 1,513 | 2,321 | 3,046 | 4,669
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 2 | 11 | 5 | 21
Intersegment interest income | (17) | (336) | (30) | (349)
Interest expense | 4,016 | 4,281 | 8,583 | 8,924
Intersegment interest expense | (866) | (785) | (1,357) | (1,652)
Net interest income | (3,165) | (3,821) | (7,251) | (7,600)
Provision for credit losses | 0 | 0 | 0 | 0
Net interest income after provision for credit losses | (3,165) | (3,821) | (7,251) | (7,600)
Noninterest income |  |  |  |
All other noninterest income | 5,991 | (339) | 5,697 | 84
Intersegment noninterest income | (745) | (580) | (1,442) | (1,158)
Total noninterest income | 5,246 | (919) | 4,255 | (1,074)
Revenue | 2,081 | (4,740) | (2,996) | (8,674)
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 11,156 | 4,159 | 22,481 | 9,680
Data processing | 96 | 164 | 192 | 307
Amortization of intangible assets | 0 | 0 | 0 | 0
Interchange expense | 0 | 0 | 0 | 0
All other noninterest expense | 2,093 | 1,652 | 11,380 | 3,383
Intersegment noninterest expense | (6,294) | (3,979) | (12,108) | (7,994)
Total noninterest expense | 7,051 | 1,996 | 21,945 | 5,376
Income (loss) before income taxes | (4,970) | (6,736) | (24,941) | (14,050)
Income taxes | (1,257) | (1,807) | (4,951) | (3,770)
Net income | (3,713) | (4,929) | (19,990) | (10,280)
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 | 247,444 | 131,928 | 414,256 | 257,738
Intersegment interest income | 0 | 324 | 0 | 324
Interest expense | 90,247 | 45,126 | 148,764 | 90,449
Intersegment interest expense | 866 | 785 | 1,357 | 1,652
Net interest income | 156,331 | 86,341 | 264,135 | 165,961
Provision for credit losses | 5,700 | 1,908 | 51,293 | 6,268
Net interest income after provision for credit losses | 150,631 | 84,433 | 212,842 | 159,693
Noninterest income |  |  |  |
All other noninterest income | 5,556 | 4,123 | (3,823) | 9,983
Intersegment noninterest income | 316 | 316 | 668 | 632
Total noninterest income | 17,246 | 12,335 | 16,478 | 25,720
Revenue | 173,577 | 98,676 | 280,613 | 191,681
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 57,247 | 30,382 | 103,973 | 57,743
Data processing | 12,381 | 5,411 | 20,330 | 10,444
Amortization of intangible assets | 4,364 | 2,335 | 7,205 | 4,437
Interchange expense | 0 | 0 | 0 | 0
All other noninterest expense | 26,162 | 17,990 | 45,987 | 33,681
Intersegment noninterest expense | 5,156 | 2,848 | 9,821 | 5,726
Total noninterest expense | 105,310 | 58,966 | 187,316 | 112,031
Income (loss) before income taxes | 62,567 | 37,802 | 42,004 | 73,382
Income taxes | 16,729 | 11,105 | 15,859 | 20,193
Net income | 45,838 | 26,697 | 26,145 | 53,189
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 | 4,981 | 2,145 | 7,998 | 4,046
Banking | Operating Segments | Card services and ATM fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,880 | 3,430 | 8,589 | 6,390
Banking | Operating Segments | Other service charges on deposit accounts |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 1,513 | 2,321 | 3,046 | 4,669
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 | 209 | 191 | 411 | 354
Intersegment noninterest income | 0 | 0 | 0 | 0
Total noninterest income | 16,986 | 16,108 | 34,552 | 31,820
Revenue | 16,986 | 16,108 | 34,552 | 31,820
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 7,106 | 6,466 | 14,137 | 13,225
Data processing | 622 | 531 | 1,215 | 1,047
Amortization of intangible assets | 228 | 294 | 470 | 601
Interchange expense | 0 | 0 | 0 | 0
All other noninterest expense | 590 | 726 | 1,327 | 1,506
Intersegment noninterest expense | 778 | 774 | 1,558 | 1,548
Total noninterest expense | 9,324 | 8,791 | 18,707 | 17,927
Income (loss) before income taxes | 7,662 | 7,317 | 15,845 | 13,893
Income taxes | 1,839 | 1,756 | 3,803 | 3,334
Net income | 5,823 | 5,561 | 12,042 | 10,559
Wealth Management | Operating Segments | Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 16,777 | 15,917 | 34,141 | 31,466
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 | 17 | 12 | 30 | 25
Interest expense | 0 | 0 | 0 | 0
Intersegment interest expense | 0 | 0 | 0 | 0
Net interest income | 17 | 12 | 30 | 25
Provision for credit losses | 0 | 0 | 0 | 0
Net interest income after provision for credit losses | 17 | 12 | 30 | 25
Noninterest income |  |  |  |
All other noninterest income | 0 | 0 | (2) | 0
Intersegment noninterest income | 429 | 264 | 774 | 526
Total noninterest income | 5,385 | 6,179 | 10,801 | 12,150
Revenue | 5,402 | 6,191 | 10,831 | 12,175
Noninterest expense |  |  |  |
Salaries, wages, and employee benefits | 2,851 | 2,471 | 5,332 | 4,920
Data processing | 922 | 994 | 1,859 | 1,852
Amortization of intangible assets | 0 | 0 | 0 | 0
Interchange expense | 1,297 | 1,733 | 2,640 | 3,344
All other noninterest expense | 718 | 598 | 1,335 | 1,183
Intersegment noninterest expense | 360 | 357 | 729 | 720
Total noninterest expense | 6,148 | 6,153 | 11,895 | 12,019
Income (loss) before income taxes | (746) | 38 | (1,064) | 156
Income taxes | (202) | 10 | (281) | 42
Net income | (544) | 28 | (783) | 114
FirsTech | Operating Segments | Wealth management fees |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 0 | 0 | 0 | 0
FirsTech | Operating Segments | Payment technology solutions |  |  |  |
Noninterest income |  |  |  |
Noninterest income | 4,956 | 5,915 | 10,029 | 11,624
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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