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LOANS AND ALLOWANCE FOR LOAN LOSSES - Purchases and Sales Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Premium on loans and leases purchased |  | $ 2,300 |  |
Transfers to loans held for sale | $ 1,139,597 | 376,995 | $ 465,854 |
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 | 752,087 | $ 81,449 | $ 6,583 |
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 on loans |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Combined notional value |  |  |  | $ 543,400

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