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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