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VARIABLE INTEREST ENTITIES - Balances and Activity in Affordable Housing Partnerships (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]          
Funding of equity investment     $ 17,346 $ 14,599  
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Maximum loss exposure     32,525    
Maximum loss exposure $ 27,786   27,786    
Income tax credits recognized 185 $ 254 (111) (177)  
Affordable Housing Fund Investment          
Variable Interest Entity [Line Items]          
Alternative investments unfunded investment commitments 18,900   18,900    
Funding of equity investment 1,602 8,325 15,473 8,779  
Proportional amortization recognized 1,724 1,464 4,019 2,654  
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 42,378   42,378   26,905
Alternative investments unfunded investment commitments 18,900   18,900   $ 22,373
Maximum loss exposure 44,443   44,443    
Income tax credits recognized $ 1,007 $ 724 $ 3,215 $ 1,833