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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019
Variable Interest Entity [Line Items] |  |  |  |
Loss on investments in alternative energy partnerships | $ 3,052 |  |  | $ 2,587
Funding of equity investment | 4,437 |  |  | 574
Affordable Housing Fund Investment |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Funding of equity investment | 4,559 |  |  | 454
Amortization expense | 1,147 |  |  | 637
Alternative investments unfunded investment commitments | 17,800 |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Funding transferred | 3,631 |  |  | 0
Maximum loss exposure | 27,347 | $ 32,525 |  |
Loss on investments in alternative energy partnerships | 1,905 | 1,039 |  | 1,950
Tax credit | 458 |  |  | 527
Cash | 5,748 | 4,224 |  |
Equipment, net of depreciation | 246,932 | 248,920 |  |
Other assets | 6,438 | 6,301 |  |
Total unconsolidated assets | 259,118 | 259,445 |  |
Total unconsolidated liabilities | 7,009 | 7,143 |  |
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Maximum loss exposure | 35,315 | 36,462 |  |
Tax credit | 1,056 |  |  | $ 555
Total amount funded | 31,464 | 26,905 |  |
Aggregate funding commitment | 49,278 | 49,278 |  |
Alternative investments unfunded investment commitments | 17,814 | 22,373 |  |
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total unconsolidated assets | $ 27,300 | $ 29,300 |  |
Variable Interest Entity, Not Primary Beneficiary | Multifamily |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Funding transferred |  |  | $ 573,500 |
Credit losses guaranteed (percent) | 12.00% |  |  |
Maximum loss exposure | $ 68,800 |  |  |
Repurchase liability recognized | $ 4,400 |  |  |

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