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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Variable Interest Entity [Line Items]          
Loss on investments in alternative energy partnerships, net   $ 5,214 $ 5,044 $ 30,786  
Aggregate funding commitment   4,000   100,000 $ 100,000
Total amount funded   806   62,800 49,900
Amount of funding canceled       37,200 50,100
Amounts not used and therefore returned         $ 1,000
Investment tax credit   3,400 9,600 38,200  
Payments of capital lease obligations   14,800 6,361 35,826  
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Multifamily loans transferred   806 0 55,400  
Maximum loss exposure   32,525 28,988    
Loss on investments in alternative energy partnerships, net   1,700 5,000 30,800  
Total unconsolidated assets   259,445 266,946    
Investment tax credit   3,400 9,600 38,200  
Variable Interest Entity, Not Primary Beneficiary | Other Assets          
Variable Interest Entity [Line Items]          
Total unconsolidated assets   $ 29,300 29,000    
Multifamily | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Multifamily loans transferred $ 573,500        
Guaranteed credit losses (maximum)   12.00%      
Maximum loss exposure   $ 68,800      
Repurchase liability recognized   4,400      
Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Aggregate funding commitment   49,300      
Total amount funded   26,900      
Payments of capital lease obligations   9,100 4,100 4,500  
Investment amortization   3,500 2,000 1,400  
Unfunded commitments   22,400      
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Maximum loss exposure   36,500 20,000    
Investment tax credit   $ 2,400 $ 1,900 $ 849