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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
investment
Variable Interest Entity [Line Items]          
Funded commitments $ (1,000) $ 13 $ (1,027) $ 30,940  
Gain (loss) on investments in alternative energy partnerships (1,808) (9,761) (1,774) (18,443)  
Tax credit 1,900 15,700 9,200 24,500  
Number of investments with completed funding | investment         1
Number of investments | investment         2
Aggregate funding commitment 100,000   100,000   $ 100,000
Total amount funded 49,900   49,900   62,800
Canceled commitment 50,100   50,100   37,200
Amount unused and returned 1,000   1,000    
Funding of equity investment     1,864 10,332  
Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Aggregate funding commitment 29,300   29,300    
Total amount funded 15,300   15,300    
Funding of equity investment 1,600 2,000 1,600 2,000  
Amortization expense 477 604 974 727  
Alternative investments unfunded investment commitments 14,000   14,000    
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Gain (loss) on investments in alternative energy partnerships 1,800 9,800 1,800 18,400  
Tax credit 1,900 15,700 9,200 24,500  
Cash 8,022   8,022   16,518
Equipment, net of depreciation 265,752   265,752   246,297
Other assets 3,262   3,262   2,444
Total unconsolidated assets 277,036   277,036   265,259
Total unconsolidated liabilities 6,073   6,073   7,181
Maximum loss exposure 44,806   44,806   98,910
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Tax credit 466 432 941 539  
Maximum loss exposure 21,000   21,000   $ 22,000
Variable Interest Entity, Not Primary Beneficiary | Other Assets          
Variable Interest Entity [Line Items]          
Total unconsolidated assets $ 44,800 $ 37,600 $ 44,800 $ 37,600