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COMMITMENTS AND CONTINGENCIES - Investment holdings schedule (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments $ 162,917   $ 162,917   $ 134,035
Qualified Affordable Housing Project Investments, Commitment 100,650   100,650   72,511
Amortization Method Qualified Affordable Housing Project Investments, Amortization 20,423 $ 7,429 26,730 $ 13,253  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (21,771) (7,430) (27,829) (13,079)  
Low Income Housing Tax Credits          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 124,155   124,155   108,974
Qualified Affordable Housing Project Investments, Commitment 70,911   70,911   57,341
Amortization Method Qualified Affordable Housing Project Investments, Amortization 3,211 2,120 9,311 6,580  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (2,757) (2,097) (8,551) (6,434)  
Historic tax credit [Member]          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 17,921   17,921   2,581
Qualified Affordable Housing Project Investments, Commitment 11,955   11,955   56
Amortization Method Qualified Affordable Housing Project Investments, Amortization 0 64 0 283  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (80) (80) (239) (239)  
New Markets Tax Credit          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 3,184   3,184   3,895
Qualified Affordable Housing Project Investments, Commitment 0   0   0
Amortization Method Qualified Affordable Housing Project Investments, Amortization 104 53 311 158  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (53) (53) (158) (158)  
Renewable Energy Program          
Summary of Investment Holdings [Line Items]          
Amortization Method Qualified Affordable Housing Project Investments 17,657   17,657   18,585
Qualified Affordable Housing Project Investments, Commitment 17,784   17,784   $ 15,114
Amortization Method Qualified Affordable Housing Project Investments, Amortization 17,108 5,192 17,108 6,232  
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ (18,881) $ (5,200) $ (18,881) $ (6,248)