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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |  |  |  |
(Gain) loss on investments in alternative energy partnerships | $ (940,000) | $ (355,000) | $ 2,484,000 | $ 655,000 | $ 4,258,000 |
Tax credit | 900,000 |  | 412,000 | 2,600,000 | 9,600,000 |
Funding of equity investment |  |  |  | 14,599,000 | 2,874,000 |
Affordable Housing Fund Investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Total amount funded | 26,500,000 |  |  | 26,500,000 |  |
Aggregate funding commitment | 49,300,000 |  |  | 49,300,000 |  |
Funding of equity investment | 8,300,000 |  | 384,000 | 8,800,000 | 2,000,000.0 |
Amortization expense | 1,500,000 |  | 498,000 | 2,700,000 | 1,500,000 |
Alternative investments unfunded investment commitments | 22,700,000 |  |  | 22,700,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Funding transferred | 0 |  | 0 | 235,000 | 0 |
Maximum loss exposure | 30,835,000 |  |  | 30,835,000 |  | $ 28,988,000
Return of capital | 0 |  | 0 | 0 | 1,000,000.0 |
(Gain) loss on investments in alternative energy partnerships | (900,000) |  | 2,500,000 | 700,000 | 4,300,000 |
Tax credit | 862,000 |  | 412,000 | 2,600,000 | 9,600,000 |
Cash | 3,871,000 |  |  | 3,871,000 |  | 3,012,000
Equipment, net of depreciation | 250,892,000 |  |  | 250,892,000 |  | 259,464,000
Other assets | 5,728,000 |  |  | 5,728,000 |  | 4,470,000
Total unconsolidated assets | 260,491,000 |  |  | 260,491,000 |  | 266,946,000
Total unconsolidated liabilities | 6,692,000 |  |  | 6,692,000 |  | 6,269,000
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Maximum loss exposure | 37,300,000 |  |  | 37,300,000 |  | $ 20,000,000.0
Tax credit | 724,000 |  | 470,000 | 1,800,000 | 1,400,000 |
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Total unconsolidated assets | 27,000,000.0 |  | $ 41,800,000 | $ 27,000,000.0 | $ 41,800,000 |
Multifamily | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Funding transferred | $ 573,500,000 |  |  |  |  |
Credit losses guaranteed (percent) | 12.00% |  |  | 12.00% |  |
Maximum loss exposure | $ 68,800,000 |  |  | $ 68,800,000 |  |
Repurchase liability recognized | $ 4,400,000 |  |  | $ 4,400,000 |  |

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