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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Variable Interest Entity [Line Items]        
Funded commitments $ 0 $ 55,400    
Loss on investments in alternative energy partnerships, net 5,044 30,786 $ 31,510  
Aggregate funding commitment   100,000   $ 100,000
Total amount funded   62,800   49,900
Amounts not used and therefore returned       1,000
Amount of funding canceled   37,200   $ 50,100
Investment tax credit 9,600 38,200 33,400  
Payments of capital lease obligations 463 1,434 954  
Affordable Housing Fund Investment        
Variable Interest Entity [Line Items]        
Total amount funded 17,800 29,300    
Unfunded commitments 11,500 8,800 501  
Payments of capital lease obligations 4,100 4,500 104  
Investment amortization 2,000 1,400 394  
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Loss on investments in alternative energy partnerships, net (5,000) (30,800)    
Total unconsolidated assets 266,946 265,259    
Investment tax credit 9,600 38,200    
Maximum loss exposure 28,988 98,910    
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment        
Variable Interest Entity [Line Items]        
Investment tax credit 1,900 849 $ 435  
Maximum loss exposure 20,000      
Variable Interest Entity, Not Primary Beneficiary | Other Assets        
Variable Interest Entity [Line Items]        
Total unconsolidated assets 29,000 48,800    
Variable Interest Entity, Not Primary Beneficiary | Other Assets | Affordable Housing Fund Investment        
Variable Interest Entity [Line Items]        
Total unconsolidated assets $ 20,000 $ 22,000