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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) investment
Variable Interest Entity [Line Items] |  |  |  |  |
Funded commitments | $ 0 | $ 15,000,000 | $ (1,027,000) | $ 45,926,000 |
Gain (loss) on investments in alternative energy partnerships | (2,484,000) | (8,348,000) | (4,258,000) | (26,791,000) |
Tax credit | 412,000 | 8,800,000 | 9,600,000 | 33,300,000 |
Number of investments with completed funding | investment |  |  |  |  | 1
Number of investments | investment |  |  |  |  | 2
Aggregate funding commitment | 100,000,000 |  | 100,000,000 |  | $ 100,000,000
Total amount funded | 49,900,000 |  | 49,900,000 |  | 62,800,000
Canceled commitment | 50,100,000 |  | 50,100,000 |  | 37,200,000
Amount unused and returned | 1,000,000 |  | 1,000,000 |  |
Funding of equity investment |  |  | 2,874,000 | 24,506,000 |
Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Aggregate funding commitment | 29,300,000 |  | 29,300,000 |  |
Total amount funded | 15,600,000 |  | 15,600,000 |  |
Funding of equity investment | 384,000 | 2,200,000 | 2,000,000 | 4,200,000 |
Amortization expense | 498,000 | 255,000 | 1,500,000 | 982,000 |
Alternative investments unfunded investment commitments | 13,600,000 |  | 13,600,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Gain (loss) on investments in alternative energy partnerships | 2,500,000 | 8,300,000 | 4,300,000 | 26,800,000 |
Tax credit | 412,000 | 8,800,000 | 9,600,000 | 33,300,000 |
Cash | 6,281,000 |  | 6,281,000 |  | 16,518,000
Equipment, net of depreciation | 261,304,000 |  | 261,304,000 |  | 246,297,000
Other assets | 3,952,000 |  | 3,952,000 |  | 2,444,000
Total unconsolidated assets | 271,537,000 |  | 271,537,000 |  | 265,259,000
Total unconsolidated liabilities | 6,127,000 |  | 6,127,000 |  | 7,181,000
Maximum loss exposure | 41,781,000 |  | 41,781,000 |  | 98,910,000
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Tax credit | 470,000 | 98,000 | 1,400,000 | 637,000 |
Maximum loss exposure | 20,500,000 |  | 20,500,000 |  | $ 22,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total unconsolidated assets | $ 41,800,000 | $ 43,800,000 | $ 41,800,000 | $ 43,800,000 |

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