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VARIABLE INTEREST ENTITIES - Balances and Activity in Affordable Housing Partnerships (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]          
Funding of equity investment     $ 14,201 $ 1,501  
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Maximum loss exposure     32,525    
Maximum loss exposure $ 26,967   26,967    
Income tax credits recognized (38) $ 380 398 380  
Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Alternative investments unfunded investment commitments 20,500   20,500    
Funding of equity investment 9,312 0 13,871 454  
Proportional amortization recognized 1,148 553 2,295 1,190  
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Maximum loss exposure     36,462    
Aggregate funding commitment 61,278   61,278   $ 49,278
Total amount funded 40,776   40,776   26,905
Alternative investments unfunded investment commitments 20,502   20,502   $ 22,373
Maximum loss exposure 46,167   46,167    
Income tax credits recognized $ 1,152 $ 554 $ 2,208 $ 1,109