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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Mar. 11, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unamortized retained loan discounts | $ 9,600 | $ 7,800 |
Loan receivable, nonaccrual, past due period (more than) | 60 days |  |
Impairment (recovery) on loans receivable | $ 19 | (16) |
Loan loss reserves | 943 | 885 |
PMC Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Acquisition discounts | $ 381 | $ 492 | $ 33,900

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