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LOANS AND ALLOWANCE FOR LOAN LOSSES - Purchases, Sales, and Transfers (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases of loans (excluding loans held-for-sale) | $ 0 |  | $ 0 | $ 0 | $ 0
Transfers from Held-For-Sale |  |  | 0 |  |
Transfers (to) Held-For-Sale |  |  | (20,019,000) |  |
Gain (loss) on derivatives | 603,000 |  |  | (8,964,000) | 0
Gain on securitization of loans | 8,900,000 |  |  |  |
Gain on sale of loans | 4,326,000 | $ 2,826,000 | 279,000 | 8,705,000 | 1,059,000
Commercial | Commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers from Held-For-Sale | 0 |  |  | 0 |
Transfers (to) Held-For-Sale | 0 |  |  | (573,000) |
Commercial | Multifamily |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers from Held-For-Sale | 0 |  | 0 | 0 | 0
Transfers (to) Held-For-Sale | 0 |  | 0 | (752,087,000) | (71,449,000)
Loans sold |  |  |  | 751,600,000 |
Gain on sale of loans | 8,900,000 |  |  | 11,700,000 |
Commercial | SBA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers from Held-For-Sale | 0 |  |  | 0 |
Transfers (to) Held-For-Sale | (559,000) |  |  | (559,000) |
Commercial | Commercial and Industrial Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers from Held-For-Sale |  |  | 0 |  | 0
Transfers (to) Held-For-Sale |  |  | (1,133,000) |  | (1,133,000)
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers from Held-For-Sale | 0 |  |  | 0 | 0
Transfers (to) Held-For-Sale | (559,000) |  |  | (1,127,898,000) | (231,843,000)
Consumer | Single family residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers from Held-For-Sale | 0 |  | 0 | 0 | 0
Transfers (to) Held-For-Sale | 0 |  | (18,886,000) | (374,679,000) | (154,899,000)
Loans sold | 144,000 |  |  | 374,800,000 |
Gain on sale of loans | $ (150,000) |  |  | 1,600,000 |
Consumer | Other consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers from Held-For-Sale |  |  | 0 |  | 0
Transfers (to) Held-For-Sale |  |  | $ 0 |  | $ (4,362,000)
Interest rate swap |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Notional value |  | $ 543,400,000 |  |  |
Freddie Mac | Commercial | Multifamily |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Transfers (to) Held-For-Sale |  |  |  | $ (573,900,000) |
Weighted average coupon (percent) |  |  |  | 3.79% |
Weighted average term to reset |  |  |  | 3 years 6 months |

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