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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Participating Mortgage Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid principal balance | $ 7,245,952 | $ 5,892,229
Unamortized net premiums | 18,005 | 6,535
Unamortized net deferred costs | 819 | 5,331
Unamortized SBA PPP fees | (831) | (1,739)
Fair value adjustment | (12,465) | (3,951)
Total | 7,251,480 | $ 5,898,405
PMB Acquisition |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Fair value adjustment | (10,600) |
PMB Acquisition | PCD loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Fair value adjustment | $ (3,900) |

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