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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, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |  |  |  |
TDR loans evaluated on individual | $ 100,000 |  |  |  |  |  |
Interest income |  | $ 0 |  | $ 0 | $ 0 | $ 0 |
Non-accrual loans for no related allowance for credit losses |  |  |  |  | 1,700,000 |  |
Minimum loan balance required for collateral-dependent loans |  | 100,000 |  |  | 100,000 |  |
Provision expense on its portfolio of outstanding loans |  | $ 0 |  | 2,000,000.0 | 1,500,000 | 2,000,000.0 |
Provision for loan losses |  |  |  | 2,000,000 | $ 1,500,000 | 2,000,000 |
Maximum percentage of concessions granted of their respective classes of loan portfolios |  | 2.00% |  |  | 2.00% |  |
Loan modifications |  |  |  |  |  |  | $ 2,949,000
Troubled debt restructurings internal grading system substandard |  |  |  |  |  |  | 1,700,000
Troubled debt restructurings returned to accrual status |  |  |  | 66,000 |  | 578,000 |
Consumer |  |  |  |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |  |  |  |
Loan modifications |  |  |  |  |  |  | 252,000
Consumer | Principal forgiveness |  |  |  |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |  |  |  |
Loan modification |  | $ 13,000 |  |  | $ 52,000 |  |
Commercial real estate |  |  |  |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |  |  |  |
Loan paid during period |  |  | $ 21,600,000 |  |  |  |
Loan modifications |  |  |  |  |  |  | $ 1,571,000
Family residential loan |  |  |  |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |  |  |  |
Loan paid during period |  | 143,000 |  |  |  |  |
Commercial business loan |  |  |  |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |  |  |  |
Loan paid during period |  | 16,000 |  |  |  |  |
Allowance for unfunded commitment |  |  |  |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |  |  |  |
Provision for loan losses |  | $ (1,200,000) |  | $ 1,300,000 | $ (3,600,000) | $ 3,300,000 |

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