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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Variable Interest Entity [Line Items]      
Gain (loss) on investments in alternative energy partnerships $ (1,950) $ 34  
Tax credit   7,300  
Funding of equity investment 574 275  
Affordable Housing Fund Investment      
Variable Interest Entity [Line Items]      
Aggregate funding commitment 29,300    
Total amount funded 18,200    
Funding of equity investment 454 14  
Amortization expense 637 497  
Alternative investments unfunded investment commitments 11,100    
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Gain (loss) on investments in alternative energy partnerships (2,000) 34  
Tax credit 0 7,300  
Cash 4,694   $ 3,012
Equipment, net of depreciation 257,475   259,464
Other assets 4,470   4,470
Total unconsolidated assets 266,639   266,946
Total unconsolidated liabilities 6,269   6,269
Maximum loss exposure 26,578   28,988
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment      
Variable Interest Entity [Line Items]      
Tax credit 555 475  
Maximum loss exposure 19,300   $ 20,000
Variable Interest Entity, Not Primary Beneficiary | Other Assets      
Variable Interest Entity [Line Items]      
Total unconsolidated assets $ 26,600 $ 48,300