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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
investment
Variable Interest Entity [Line Items]      
Funded commitments $ 0 $ 30,927  
Gain (loss) on investments in alternative energy partnerships 34 (8,682)  
Tax credit 7,300 8,800  
Number of investments with completed funding | investment     1
Number of investments | investment     2
Aggregate funding commitment     $ 100,000
Total amount funded     62,800
Canceled commitment     37,200
Funding of equity investment 275 0  
Alternative investments unfunded investment commitments 50,100    
Affordable Housing Fund Investment      
Variable Interest Entity [Line Items]      
Aggregate funding commitment 29,300    
Total amount funded 13,700    
Funding of equity investment 14 0  
Amortization expense 497 123  
Alternative investments unfunded investment commitments 15,600    
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Gain (loss) on investments in alternative energy partnerships 34 (8,700)  
Tax credit 7,300 8,800  
Cash 6,107   16,518
Equipment, net of depreciation 268,320   246,297
Other assets 2,444   2,444
Total unconsolidated assets 276,871   265,259
Total unconsolidated liabilities 7,181   7,181
Maximum loss exposure 98,428   98,910
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment      
Variable Interest Entity [Line Items]      
Tax credit 475 106  
Maximum loss exposure 21,500   $ 22,000
Variable Interest Entity, Not Primary Beneficiary | Other Assets      
Variable Interest Entity [Line Items]      
Total unconsolidated assets $ 48,300 $ 47,600