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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Variable Interest Entity [Line Items]            
(Gain) loss on investments in alternative energy partnerships $ (940,000) $ (355,000) $ 2,484,000 $ 655,000 $ 4,258,000  
Tax credit 900,000   412,000 2,600,000 9,600,000  
Funding of equity investment       14,599,000 2,874,000  
Affordable Housing Fund Investment            
Variable Interest Entity [Line Items]            
Total amount funded 26,500,000     26,500,000    
Aggregate funding commitment 49,300,000     49,300,000    
Funding of equity investment 8,300,000   384,000 8,800,000 2,000,000.0  
Amortization expense 1,500,000   498,000 2,700,000 1,500,000  
Alternative investments unfunded investment commitments 22,700,000     22,700,000    
Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Funding transferred 0   0 235,000 0  
Maximum loss exposure 30,835,000     30,835,000   $ 28,988,000
Return of capital 0   0 0 1,000,000.0  
(Gain) loss on investments in alternative energy partnerships (900,000)   2,500,000 700,000 4,300,000  
Tax credit 862,000   412,000 2,600,000 9,600,000  
Cash 3,871,000     3,871,000   3,012,000
Equipment, net of depreciation 250,892,000     250,892,000   259,464,000
Other assets 5,728,000     5,728,000   4,470,000
Total unconsolidated assets 260,491,000     260,491,000   266,946,000
Total unconsolidated liabilities 6,692,000     6,692,000   6,269,000
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Fund Investment            
Variable Interest Entity [Line Items]            
Maximum loss exposure 37,300,000     37,300,000   $ 20,000,000.0
Tax credit 724,000   470,000 1,800,000 1,400,000  
Variable Interest Entity, Not Primary Beneficiary | Other Assets            
Variable Interest Entity [Line Items]            
Total unconsolidated assets 27,000,000.0   $ 41,800,000 $ 27,000,000.0 $ 41,800,000  
Multifamily | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Funding transferred $ 573,500,000          
Credit losses guaranteed (percent) 12.00%     12.00%    
Maximum loss exposure $ 68,800,000     $ 68,800,000    
Repurchase liability recognized $ 4,400,000     $ 4,400,000