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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unamortized retained loan discounts | $ 9,800,000 |  | $ 9,800,000 |  | $ 9,600,000 |
Loan receivable, nonaccrual, past due period (more than) |  |  | 60 days |  |  |
Loans receivable, impairment and (recovery) recorded | 0 | $ (88,000) | $ 0 | $ 4,000 |  |
Loan loss reserves | 954,000 |  | 954,000 |  | 943,000 |
PMC Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquisition discount | $ 321,000 |  | $ 321,000 |  | $ 381,000 | $ 33,900,000

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