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COMMITMENTS AND CONTINGENCIES - Investment holdings schedule (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments $ 127,689   $ 127,689   $ 100,417
Qualified Affordable Housing Project Investments, Commitment 69,488   69,488   55,556
Amortization Method Qualified Affordable Housing Project Investments, Amortization 7,429 $ 2,078 13,253 $ 6,409  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (7,430) (1,938) (13,079) (6,019)  
Low Income Housing Tax Credits          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 111,288   111,288   90,401
Qualified Affordable Housing Project Investments, Commitment 61,492   61,492   47,531
Amortization Method Qualified Affordable Housing Project Investments, Amortization 2,120 1,972 6,580 6,076  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (2,097) (1,812) (6,434) (5,643)  
Historic tax credit [Member]          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 3,414   3,414   3,607
Qualified Affordable Housing Project Investments, Commitment 56   56   364
Amortization Method Qualified Affordable Housing Project Investments, Amortization 64 62 283 202  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (80) (82) (239) (245)  
New Markets Tax Credit          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 4,074   4,074   1,165
Qualified Affordable Housing Project Investments, Commitment 0   0   0
Amortization Method Qualified Affordable Housing Project Investments, Amortization 53 44 158 131  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (53) (44) (158) (131)  
Renewable Energy Program          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 8,913   8,913   5,244
Qualified Affordable Housing Project Investments, Commitment 7,940   7,940   $ 7,661
Amortization Method Qualified Affordable Housing Project Investments, Amortization 5,192 0 6,232 0  
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ (5,200) $ 0 $ (6,248) $ 0