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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Variable Interest Entity [Line Items] |  |  |  |  |
Loss on investments in alternative energy partnerships, net |  | $ 5,214 | $ 5,044 | $ 30,786 |
Aggregate funding commitment |  | 4,000 |  | 100,000 | $ 100,000
Total amount funded |  | 806 |  | 62,800 | 49,900
Amount of funding canceled |  |  |  | 37,200 | 50,100
Amounts not used and therefore returned |  |  |  |  | $ 1,000
Investment tax credit |  | 3,400 | 9,600 | 38,200 |
Payments of capital lease obligations |  | 14,800 | 6,361 | 35,826 |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Multifamily loans transferred |  | 806 | 0 | 55,400 |
Maximum loss exposure |  | 32,525 | 28,988 |  |
Loss on investments in alternative energy partnerships, net |  | 1,700 | 5,000 | 30,800 |
Total unconsolidated assets |  | 259,445 | 266,946 |  |
Investment tax credit |  | 3,400 | 9,600 | 38,200 |
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total unconsolidated assets |  | $ 29,300 | 29,000 |  |
Multifamily | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Multifamily loans transferred | $ 573,500 |  |  |  |
Guaranteed credit losses (maximum) |  | 12.00% |  |  |
Maximum loss exposure |  | $ 68,800 |  |  |
Repurchase liability recognized |  | 4,400 |  |  |
Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Aggregate funding commitment |  | 49,300 |  |  |
Total amount funded |  | 26,900 |  |  |
Payments of capital lease obligations |  | 9,100 | 4,100 | 4,500 |
Investment amortization |  | 3,500 | 2,000 | 1,400 |
Unfunded commitments |  | 22,400 |  |  |
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum loss exposure |  | 36,500 | 20,000 |  |
Investment tax credit |  | $ 2,400 | $ 1,900 | $ 849 |

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