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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill and Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Goodwill |  |  |
Balance, beginning | $ 497,318 | $ 497,318 | $ 497,260
Goodwill true-up |  |  | 58
Balance, ending | 497,318 | 497,318 | 497,318
Intangible Assets |  |  |
Balance, beginning | 92,546 |  |
Amortization | (21,580) | (24,220) | (26,883)
Balance, ending | 71,018 | 92,546 |
Core Deposit Intangibles |  |  |
Intangible Assets |  |  |
Balance, beginning | 92,546 | 116,712 | 143,525
Amortization | (21,528) | (24,166) | (26,813)
Balance, ending | 71,018 | 92,546 | 116,712
Servicing Assets |  |  |
Intangible Assets |  |  |
Balance, beginning | 146 | 212 | 309
Amortization | (52) | (54) | (70)
Decrease due to payoff of serviced loans | (24) | (12) | (27)
Balance, ending | $ 70 | $ 146 | $ 212

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