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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Variable Interest Entity [Line Items]          
Funded commitments $ 13   $ 30,940 $ 0  
Loss on investments in alternative energy partnerships 9,761 $ 0 18,443 0  
Total amount funded 88,300   88,300    
Aggregate funding commitment 200,000   200,000    
Tax credit 15,700   24,500    
Funding of equity investment     10,332 $ 0  
Alternative investments unfunded investment commitments 111,700   111,700    
Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Total amount funded 11,200   11,200    
Aggregate funding commitment 29,500   29,500    
Funding of equity investment     2,000    
Amortization expense 604   727    
Alternative investments unfunded investment commitments 18,400   18,400    
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Loss on investments in alternative energy partnerships 9,800   18,400    
Tax credit 15,700   24,500    
Cash 6,777   6,777   $ 0
Equipment, net of depreciation 212,550   212,550   151,721
Other assets 1,165   1,165   351
Total unconsolidated assets 220,492   220,492   152,072
Total unconsolidated liabilities 2,843   2,843   0
Maximum loss exposure 149,324   149,324   $ 68,298
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Tax credit 432   539    
Maximum loss exposure 4,500   4,500    
Variable Interest Entity, Not Primary Beneficiary | Other Assets          
Variable Interest Entity [Line Items]          
Total unconsolidated assets 37,600   37,600    
Variable Interest Entity, Not Primary Beneficiary | Other Assets | Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Total unconsolidated assets $ 4,500   $ 4,500