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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Variable Interest Entity [Line Items] |  |  |
Funded commitments | $ 55,400 | $ 57,300 |
Loss on investments in alternative energy partnerships, net | 30,786 | 31,510 | $ 0
Aggregate funding commitment | 100,000 |  |
Total amount funded | 62,800 |  |
Amount of funding canceled | 37,200 |  |
Investment tax credit | 38,200 | 33,400 |
Unfunded commitments | 50,100 |  |
Payments of capital lease obligations | 1,434 | 954 | 947
Affordable Housing Fund Investment |  |  |
Variable Interest Entity [Line Items] |  |  |
Total amount funded | 13,700 | 29,300 |
Unfunded commitments | 15,600 | 11,000 | 50,600
Payments of capital lease obligations | 4,500 | 104 | 48
Investment amortization | 1,400 | 394 | 727
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Loss on investments in alternative energy partnerships, net | (30,800) | (31,500) |
Total unconsolidated assets | 265,259 | 152,072 |
Investment tax credit | 38,200 | 33,400 |
Maximum loss exposure | 98,910 | 68,298 |
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment tax credit | 849 | 435 | $ 632
Maximum loss exposure | 22,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |
Variable Interest Entity [Line Items] |  |  |
Total unconsolidated assets | 48,800 | 25,600 |
Variable Interest Entity, Not Primary Beneficiary | Other Assets | Affordable Housing Fund Investment |  |  |
Variable Interest Entity [Line Items] |  |  |
Total unconsolidated assets | $ 22,000 | $ 23,200 |

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