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OPERATING SEGMENTS AND RELATED INFORMATION - Schedule of Goodwill and Total Assets of Segments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Goodwill | $ 333,695 | $ 317,873
Total assets | 12,046,722 | 12,283,415
Banking |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 310,595 | 294,773
Wealth Management |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 14,108 | 14,108
FirsTech |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 8,992 | 8,992
Operating Segments | Banking |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 310,595 | 294,773
Total assets | 11,856,651 | 12,125,298
Operating Segments | Wealth Management |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 14,108 | 14,108
Total assets | 126,180 | 103,147
Operating Segments | FirsTech |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 8,992 | 8,992
Total assets | 57,737 | 51,600
Other |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 0 | 0
Total assets | $ 6,154 | $ 3,370

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