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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |  |  |
Funded commitments | $ 15,000 |  | $ 45,926 | $ 41,572 |
Loss on investments in alternative energy partnerships | 8,348 | $ 17,660 | 26,791 | 17,660 |
Total amount funded | 103,300 | 41,600 | 103,300 | 41,600 |
Aggregate funding commitment | 200,000 | 100,000 | 200,000 | 100,000 |
Tax credit | 8,800 | 19,400 | 33,300 | 19,400 |
Funding of equity investment |  |  | 24,506 | 0 |
Alternative investments unfunded investment commitments | 96,700 |  | 96,700 |  |
Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total amount funded | 13,400 |  | 13,400 |  |
Aggregate funding commitment | 29,500 |  | 29,500 |  |
Funding of equity investment | 2,200 |  | 4,200 |  |
Amortization expense | 255 |  | 982 |  |
Alternative investments unfunded investment commitments | 16,200 |  | 16,200 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Loss on investments in alternative energy partnerships | 8,300 | 17,700 | 26,800 | 17,700 |
Tax credit | 8,800 | 19,400 | 33,300 | 19,400 |
Cash | 5,550 |  | 5,550 |  | $ 0
Equipment, net of depreciation | 245,717 |  | 245,717 |  | 151,721
Other assets | 1,631 |  | 1,631 |  | 351
Total unconsolidated assets | 252,898 |  | 252,898 |  | 152,072
Total unconsolidated liabilities | 3,157 |  | 3,157 |  | 0
Maximum loss exposure | 140,550 |  | 140,550 |  | $ 68,298
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Tax credit | 98 |  | 637 |  |
Maximum loss exposure | 22,600 |  | 22,600 |  |
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total unconsolidated assets | 43,800 | $ 23,900 | 43,800 | $ 23,900 |
Variable Interest Entity, Not Primary Beneficiary | Other Assets | Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total unconsolidated assets | $ 6,500 |  | $ 6,500 |  |

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