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VARIABLE INTEREST ENTITIES - Balances and Activity in Affordable Housing Partnerships (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |
Funding of equity investment | $ 4,437 | $ 574 |
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Maximum loss exposure | 32,525 |  |
Maximum loss exposure | 27,347 |  |
Tax credit | 458 | 527 |
Affordable Housing Fund Investment |  |  |
Variable Interest Entity [Line Items] |  |  |
Alternative investments unfunded investment commitments | 17,800 |  |
Funding of equity investment | 4,559 | 454 |
Amortization expense | 1,147 | 637 |
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Maximum loss exposure | 36,462 |  |
Aggregate funding commitment | 49,278 |  | $ 49,278
Total amount funded | 31,464 |  | 26,905
Alternative investments unfunded investment commitments | 17,814 |  | $ 22,373
Maximum loss exposure | 35,315 |  |
Tax credit | $ 1,056 | $ 555 |

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