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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Loans receivable, allowance for credit losses | $ 67,300,000 | $ 62,761,000 |  | $ 62,761,000 |  | $ 60,754,000
Troubled debt restructurings internal grading system substandard |  | 1,800,000 |  |  |  | 2,900,000
TDR loans, Balance |  | 2,986,000 |  | 2,986,000 |  | 3,851,000
Non-accrual loans for no related allowance amortized cost |  |  |  | 2,400,000 |  |
TDR loans evaluated on individual | 100,000 |  |  |  |  |
After-tax effect decreased retained earnings | 14,200,000 |  |  |  |  |
Troubled debt restructurings returned to accrual status |  | 66,000 | $ 96,000 | 578,000 | $ 433,000 |
Provision for Loan Losses |  | 2,000,000 | (3,000,000) | 2,000,000 | (3,700,000) |
Provision for Loan Losses |  | 2,000,000.0 | 3,000,000.0 | 2,000,000.0 | (3,700,000) |
Provision (credit) for unfunded commitments |  | 1,315,000 | 643,000 | 3,345,000 | (338,000) |
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 |  |
Interest income |  | 0 | 0 | 0 | 0 |
Allowance for unfunded commitment |  |  |  |  |  |
Provision for Loan Losses |  | $ 1,300,000 | $ (643,000) | $ 3,300,000 | $ (338,000) |
Allowance for credit losses | 8,700,000 |  |  |  |  |
PCI [Member] |  |  |  |  |  |
Allowance for credit losses | 1,900,000 |  |  |  |  |
Adopted ASC 326 [Member] |  |  |  |  |  |
Allowance for credit losses | $ 11,600,000 |  |  |  |  |

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