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COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 16, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Commitments and contingencies |  |  |  |  |
Contract amount of commitments and contingencies |  | $ 1,615,899 | $ 1,555,901 |  |
Loss contingency accrual, payments |  |  | 5,800 |  |
Basis points | 0.134% |  |  |  |
Uninsured deposits |  |  |  |  | $ 5,000,000
FDIC expenses |  | 400 | 1,500 |  |
Litigation accrual |  |  | 5,800 |  |
Litigation accrual for the year |  | 0 |  |  |
FDIC insurance expense |  | 2,600 |  | $ 2,100 |
Commitments to extend credit |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Contract amount of commitments and contingencies |  | 1,550,998 | 1,494,549 |  |
Standby letters of credit |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Contract amount of commitments and contingencies |  | $ 64,901 | $ 61,352 |  |

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