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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Purchases and Sales Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Premium on loans and leases purchased | $ 17,500 | $ 4,700 | $ 0 |
Transfers to loans held for sale | 15,206 | 0 | 1,139,597 |
Realized loss on derivatives |  |  | 9,000 |
Gain on securitization |  |  | 8,900 |
Multifamily | Commercial |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Transfers to loans held for sale | $ 0 | $ 0 | 752,087 |
Multifamily | Federal Home Loan Mortgage Corporation | Commercial |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Transfers to loans held for sale |  |  | $ 573,900 |
Weighted average coupon rate (percent) |  |  | 3.79% |
Weighted average term to initial reset |  |  | 3 years 6 months |
Interest rate swaps and caps |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Combined notional value |  |  |  | $ 543,400

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