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OPERATING SEGMENTS AND RELATED INFORMATION - Schedule of Information Relating to Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | $ 333,498 |  | $ 333,498 |  | $ 317,873
Total Assets | 11,986,839 |  | 11,986,839 |  | 12,283,415
Net interest income | 82,541 | $ 77,791 | 240,742 | $ 242,318 |
Noninterest income | 35,951 | 31,008 | 104,752 | 90,868 |
Noninterest expense | 75,926 | 70,945 | 222,232 | 210,553 |
Income before income taxes | 42,564 | 37,490 | 115,945 | 120,689 |
Net income | 32,004 | 30,666 | 85,586 | 96,816 |
Operating segment | Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 310,398 |  | 310,398 |  | 294,773
Total Assets | 11,806,647 |  | 11,806,647 |  | 12,125,298
Net interest income | 86,425 | 81,794 | 252,200 | 254,394 |
Noninterest income | 14,056 | 11,983 | 39,962 | 34,716 |
Noninterest expense | 56,740 | 55,172 | 167,724 | 163,314 |
Income before income taxes | 43,739 | 38,241 | 117,121 | 123,852 |
Net income | 33,221 | 31,189 | 86,410 | 98,689 |
Operating segment | Wealth Management |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 14,108 |  | 14,108 |  | 14,108
Total Assets | 119,801 |  | 119,801 |  | 103,147
Noninterest income | 16,169 | 14,350 | 47,989 | 43,993 |
Noninterest expense | 8,777 | 8,059 | 26,704 | 24,821 |
Income before income taxes | 7,392 | 6,291 | 21,285 | 19,172 |
Net income | 5,618 | 4,781 | 16,177 | 14,571 |
Operating segment | FirsTech |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 8,992 |  | 8,992 |  | 8,992
Total Assets | 51,474 |  | 51,474 |  | 51,600
Net interest income | 12 | 14 | 37 | 41 |
Noninterest income | 5,551 | 5,665 | 17,700 | 16,954 |
Noninterest expense | 5,648 | 5,245 | 17,666 | 16,303 |
Income before income taxes | (85) | 434 | 71 | 692 |
Net income | (61) | 317 | 53 | 505 |
Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 0 |  | 0 |  | 0
Total Assets | 8,917 |  | 8,917 |  | $ 3,370
Net interest income | (3,896) | (4,017) | (11,495) | (12,117) |
Noninterest income | 175 | (990) | (899) | (4,795) |
Noninterest expense | 4,761 | 2,469 | 10,138 | 6,115 |
Income before income taxes | (8,482) | (7,476) | (22,532) | (23,027) |
Net income | $ (6,774) | $ (5,621) | $ (17,054) | $ (16,949) |

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