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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Allowance for credit losses | $ 67,300,000 |  |  |  |  |
Troubled Debt Restructurings Internal Grading System Substandard |  | $ 2,800,000 |  |  |  | $ 2,900,000
Financing Receivables, Troubled Debt Restructuring |  | 3,600,000 |  | $ 3,600,000 |  | 3,900,000
Non-accrual loans for no related allowance amortized cost |  |  |  | 2,900,000 |  |
TDR loans evaluated on individual | 100,000 |  |  |  |  |
After-tax effect decreased retained earnings | 14,200,000 |  |  |  |  |
Troubled Debt Restructurings Returned to Accrual Status |  | 290,000 | $ 310,000 | 511,000 | $ 337,000 |
Loans and Leases Receivable, Allowance |  | 61,058,000 |  | 61,058,000 |  | 60,754,000
Impaired Financing Receivable, Related Allowance |  | 211,000 |  | 211,000 |  | 495,000
Provision for Loan Losses |  | 0 | (1,000,000.0) | 0 | (700,000) |
FDIC-acquired loans and remaining Accretable yield |  |  |  |  |  | $ 429,000
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans |  |  |  | 100,000 |  |
Allowance for unfunded commitment |  |  |  |  |  |
Allowance for credit losses | 8,700,000 |  |  |  |  |
Provision for Loan Losses |  | $ 2,200,000 | $ (307,000) | $ 2,000,000.0 | $ (981,000) |
PCI [Member] |  |  |  |  |  |
Allowance for credit losses | 1,900,000 |  |  |  |  |
Adopted ASC 326 [Member] |  |  |  |  |  |
Loans and Leases Receivable, Allowance | $ 11,600,000 |  |  |  |  |

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