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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
 12 Months Ended
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