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COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS. |  |  |
Contract amount of commitments and contingencies | $ 1,486,563,000 | $ 1,352,781,000 |
Unused lines of credit | 25,000,000.0 |  |
Federal Home Loan Bank unused borrowing capacity | 1,710,000,000 |  |
Federal Reserve unused borrowing capacity | 247,700,000 |  |
Federal Reserve required average total reserve | 0 | 0 |
Litigation accrual | (100,000) | 2,950,000 | $ 0
Litigation settlement amount | 2,900,000 |  |
Adjustment to the Company's litigation accrual | 100,000 |  |
Minimum |  |  |
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS. |  |  |
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability | 0 |  |
Maximum |  |  |
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS. |  |  |
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability | 1,000,000 |  |
Commitments to Extend Credit |  |  |
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS. |  |  |
Contract amount of commitments and contingencies | 1,443,879,000 | 1,313,568,000 |
Standby Letters of Credit |  |  |
COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS. |  |  |
Contract amount of commitments and contingencies | $ 42,684,000 | $ 39,213,000 |

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