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OPERATING SEGMENTS AND RELATED INFORMATION - Schedule of Financial Results by Operating Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 523,681 | $ 480,543 | $ 360,176
Intersegment interest income | 0 | 0 | 0
Interest expense | 201,070 | 159,922 | 36,548
Intersegment interest expense | 0 | 0 | 0
Net interest income | 322,611 | 320,621 | 323,628
Provision for credit losses | 8,590 | 2,399 | 4,623
Net interest income after provision for credit losses | 314,021 | 318,222 | 319,005
Noninterest income |  |  |
All other noninterest income | 23,136 | 13,669 | 18,057
Intersegment noninterest income | 0 | 0 | 0
Total noninterest income | 139,682 | 121,214 | 126,613
Revenue | 462,293 | 441,835 | 450,241
Noninterest expense |  |  |
Salaries, wages, and employee benefits | 175,619 | 162,597 | 159,016
Data processing | 27,124 | 23,708 | 21,648
Amortization of intangible assets | 10,057 | 10,432 | 11,628
Interchange expense | 6,001 | 6,864 | 6,298
Other noninterest expense | 81,598 | 81,931 | 85,291
Intersegment noninterest expense | 0 | 0 | 0
Total noninterest expense | 300,399 | 285,532 | 283,881
Income (loss) before income taxes | 153,304 | 153,904 | 161,737
Income taxes | 39,613 | 31,339 | 33,426
Net income | 113,691 | 122,565 | 128,311
Wealth management fees |  |  |
Noninterest income |  |  |
Noninterest income | 63,630 | 57,309 | 55,378
Fees for customer services |  |  |
Noninterest income |  |  |
Noninterest income | 30,933 | 29,044 | 33,111
Payment technology solutions |  |  |
Noninterest income |  |  |
Noninterest income | 21,983 | 21,192 | 20,067
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 33 | 105 | 50
Intersegment interest income | (372) | (54) | (65)
Interest expense | 17,944 | 19,005 | 17,854
Intersegment interest expense | (2,664) | (3,006) | (1,159)
Net interest income | (15,619) | (15,948) | (16,710)
Provision for credit losses | 0 | 0 | 0
Net interest income after provision for credit losses | (15,619) | (15,948) | (16,710)
Noninterest income |  |  |
All other noninterest income | 942 | (2,182) | (1,846)
Intersegment noninterest income | (2,473) | (2,703) | (2,618)
Total noninterest income | (1,531) | (4,885) | (4,464)
Revenue | (17,150) | (20,833) | (21,174)
Noninterest expense |  |  |
Salaries, wages, and employee benefits | 21,128 | 17,767 | 20,965
Data processing | 538 | 541 | 545
Amortization of intangible assets | 0 | 0 | 0
Interchange expense | 0 | 0 | 0
Other noninterest expense | 9,593 | 6,015 | 6,739
Intersegment noninterest expense | (15,996) | (16,976) | (18,528)
Total noninterest expense | 15,263 | 7,347 | 9,721
Income (loss) before income taxes | (32,413) | (28,180) | (30,895)
Income taxes | (7,478) | (7,258) | (8,220)
Net income | (24,935) | (20,922) | (22,675)
Other | Wealth management fees |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
Other | Fees for customer services |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
Other | Payment technology solutions |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
Banking | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 523,648 | 480,438 | 360,126
Intersegment interest income | 324 | 0 | 0
Interest expense | 183,126 | 140,917 | 18,694
Intersegment interest expense | 2,664 | 3,006 | 1,159
Net interest income | 338,182 | 336,515 | 340,273
Provision for credit losses | 8,590 | 2,399 | 4,623
Net interest income after provision for credit losses | 329,592 | 334,116 | 335,650
Noninterest income |  |  |
All other noninterest income | 20,871 | 15,337 | 19,890
Intersegment noninterest income | 1,402 | 1,149 | 962
Total noninterest income | 53,206 | 45,530 | 53,963
Revenue | 391,388 | 382,045 | 394,236
Noninterest expense |  |  |
Salaries, wages, and employee benefits | 117,730 | 111,834 | 107,159
Data processing | 20,631 | 18,217 | 16,420
Amortization of intangible assets | 8,916 | 8,963 | 9,831
Interchange expense | 0 | 0 | 0
Other noninterest expense | 66,433 | 71,259 | 73,544
Intersegment noninterest expense | 11,457 | 13,178 | 15,042
Total noninterest expense | 225,167 | 223,451 | 221,996
Income (loss) before income taxes | 157,631 | 156,195 | 167,617
Income taxes | 40,365 | 32,342 | 36,021
Net income | 117,266 | 123,853 | 131,596
Banking | Operating Segments | Wealth management fees |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
Banking | Operating Segments | Fees for customer services |  |  |
Noninterest income |  |  |
Noninterest income | 30,933 | 29,044 | 33,111
Banking | Operating Segments | Payment technology solutions |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
Wealth Management | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 0 | 0 | 0
Intersegment interest income | 0 | 0 | 0
Interest expense | 0 | 0 |
Intersegment interest expense | 0 | 0 | 0
Net interest income | 0 | 0 | 0
Provision for credit losses | 0 | 0 | 0
Net interest income after provision for credit losses | 0 | 0 | 0
Noninterest income |  |  |
All other noninterest income | 1,323 | 514 | 16
Intersegment noninterest income | 0 | 0 | 0
Total noninterest income | 64,953 | 57,823 | 55,394
Revenue | 64,953 | 57,823 | 55,394
Noninterest expense |  |  |
Salaries, wages, and employee benefits | 26,631 | 24,474 | 22,993
Data processing | 2,263 | 1,937 | 1,962
Amortization of intangible assets | 1,141 | 1,469 | 1,797
Interchange expense | 0 | 0 | 0
Other noninterest expense | 2,836 | 2,503 | 2,593
Intersegment noninterest expense | 3,096 | 2,698 | 2,200
Total noninterest expense | 35,967 | 33,081 | 31,545
Income (loss) before income taxes | 28,986 | 24,742 | 23,849
Income taxes | 6,956 | 5,938 | 5,306
Net income | 22,030 | 18,804 | 18,543
Wealth Management | Operating Segments | Wealth management fees |  |  |
Noninterest income |  |  |
Noninterest income | 63,630 | 57,309 | 55,378
Wealth Management | Operating Segments | Fees for customer services |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
Wealth Management | Operating Segments | Payment technology solutions |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
FirsTech | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 0 | 0 | 0
Intersegment interest income | 48 | 54 | 65
Interest expense | 0 | 0 | 0
Intersegment interest expense | 0 | 0 | 0
Net interest income | 48 | 54 | 65
Provision for credit losses | 0 | 0 | 0
Net interest income after provision for credit losses | 48 | 54 | 65
Noninterest income |  |  |
All other noninterest income | 0 | 0 | (3)
Intersegment noninterest income | 1,071 | 1,554 | 1,656
Total noninterest income | 23,054 | 22,746 | 21,720
Revenue | 23,102 | 22,800 | 21,785
Noninterest expense |  |  |
Salaries, wages, and employee benefits | 10,130 | 8,522 | 7,899
Data processing | 3,692 | 3,013 | 2,721
Amortization of intangible assets | 0 | 0 | 0
Interchange expense | 6,001 | 6,864 | 6,298
Other noninterest expense | 2,736 | 2,154 | 2,415
Intersegment noninterest expense | 1,443 | 1,100 | 1,286
Total noninterest expense | 24,002 | 21,653 | 20,619
Income (loss) before income taxes | (900) | 1,147 | 1,166
Income taxes | (230) | 317 | 319
Net income | (670) | 830 | 847
FirsTech | Operating Segments | Wealth management fees |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
FirsTech | Operating Segments | Fees for customer services |  |  |
Noninterest income |  |  |
Noninterest income | 0 | 0 | 0
FirsTech | Operating Segments | Payment technology solutions |  |  |
Noninterest income |  |  |
Noninterest income | $ 21,983 | $ 21,192 | $ 20,067

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