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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loss on investments in alternative energy partnerships | $ (355,000) | $ 1,950,000 | $ 1,808,000 | $ 1,595,000 | $ 1,774,000 |
Tax credit | 1,700,000 |  | 1,900,000 | 1,700,000 | 9,200,000 |
Funding of equity investment |  |  |  | 1,501,000 | 1,864,000 |
Affordable Housing Fund Investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Total amount funded | 18,200,000 |  |  | 18,200,000 |  |
Aggregate funding commitment | 29,300,000 |  |  | 29,300,000 |  |
Funding of equity investment | 0 |  | 1,600,000 | 454,000 | 1,600,000 |
Amortization expense | 553,000 |  | 477,000 | 1,200,000 | 974,000 |
Alternative investments unfunded investment commitments | 11,100,000 |  |  | 11,100,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Funding | 235,000 |  | 13,000 | 235,000 | 30,900,000 |
Return of capital | 0 |  | 1,000,000.0 | 0 | 1,000,000.0 |
Loss on investments in alternative energy partnerships | (400,000) |  | 1,800,000 | 1,600,000 | (1,800,000) |
Tax credit | 1,700,000 |  | 1,900,000 | 1,700,000 | 9,200,000 |
Cash | 3,610,000 |  |  | 3,610,000 |  | $ 3,012,000
Equipment, net of depreciation | 252,888,000 |  |  | 252,888,000 |  | 259,464,000
Other assets | 4,842,000 |  |  | 4,842,000 |  | 4,470,000
Total unconsolidated assets | 261,340,000 |  |  | 261,340,000 |  | 266,946,000
Total unconsolidated liabilities | 6,166,000 |  |  | 6,166,000 |  | 6,269,000
Maximum loss exposure | 30,429,000 |  |  | 30,429,000 |  | 28,988,000
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Tax credit | 554,000 |  | 466,000 | 1,100,000 | 941,000 |
Maximum loss exposure | 18,800,000 |  |  | 18,800,000 |  | $ 20,000,000.0
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Total unconsolidated assets | $ 26,600,000 |  | $ 44,800,000 | $ 26,600,000 | $ 44,800,000 |

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