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COMMITMENTS AND CONTINGENCIES - Investment Holdings Schedule (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments $ 134,035 $ 100,417  
Qualified Affordable Housing Project Investments, Commitment 72,511 55,556  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 21,687 13,481 $ 10,143
Affordable Housing Tax Credits and Other Tax Benefits, Amount (21,270) (13,144) (10,089)
Low Income Housing Tax Credits      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 108,974 90,401  
Qualified Affordable Housing Project Investments, Commitment 57,341 47,531  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 8,894 8,076 6,931
Affordable Housing Tax Credits and Other Tax Benefits, Amount (8,581) (7,629) (6,397)
Historic tax credit [Member]      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 2,581 3,607  
Qualified Affordable Housing Project Investments, Commitment 56 364  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 1,116 474 2,862
Affordable Housing Tax Credits and Other Tax Benefits, Amount (263) (563) (3,342)
New Markets Tax Credit      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 3,895 1,165  
Qualified Affordable Housing Project Investments, Commitment 0 0  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 210 175 350
Affordable Housing Tax Credits and Other Tax Benefits, Amount (210) (175) (350)
Renewable Energy Program [Member]      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 18,585 5,244  
Qualified Affordable Housing Project Investments, Commitment 15,114 7,661  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 11,467 4,756 0
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ (12,216) $ (4,777) $ 0