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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) investment
Variable Interest Entity [Line Items] |  |  |  |  |
Funded commitments | $ (1,000) | $ 13 | $ (1,027) | $ 30,940 |
Gain (loss) on investments in alternative energy partnerships | (1,808) | (9,761) | (1,774) | (18,443) |
Tax credit | 1,900 | 15,700 | 9,200 | 24,500 |
Number of investments with completed funding | investment |  |  |  |  | 1
Number of investments | investment |  |  |  |  | 2
Aggregate funding commitment | 100,000 |  | 100,000 |  | $ 100,000
Total amount funded | 49,900 |  | 49,900 |  | 62,800
Canceled commitment | 50,100 |  | 50,100 |  | 37,200
Amount unused and returned | 1,000 |  | 1,000 |  |
Funding of equity investment |  |  | 1,864 | 10,332 |
Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Aggregate funding commitment | 29,300 |  | 29,300 |  |
Total amount funded | 15,300 |  | 15,300 |  |
Funding of equity investment | 1,600 | 2,000 | 1,600 | 2,000 |
Amortization expense | 477 | 604 | 974 | 727 |
Alternative investments unfunded investment commitments | 14,000 |  | 14,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Gain (loss) on investments in alternative energy partnerships | 1,800 | 9,800 | 1,800 | 18,400 |
Tax credit | 1,900 | 15,700 | 9,200 | 24,500 |
Cash | 8,022 |  | 8,022 |  | 16,518
Equipment, net of depreciation | 265,752 |  | 265,752 |  | 246,297
Other assets | 3,262 |  | 3,262 |  | 2,444
Total unconsolidated assets | 277,036 |  | 277,036 |  | 265,259
Total unconsolidated liabilities | 6,073 |  | 6,073 |  | 7,181
Maximum loss exposure | 44,806 |  | 44,806 |  | 98,910
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Tax credit | 466 | 432 | 941 | 539 |
Maximum loss exposure | 21,000 |  | 21,000 |  | $ 22,000
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total unconsolidated assets | $ 44,800 | $ 37,600 | $ 44,800 | $ 37,600 |

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