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COMMITMENTS AND CONTINGENCIES - Investment holdings schedule (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments $ 168,674   $ 158,440
Qualified Affordable Housing Project Investments, Commitment 94,319   84,334
Amortization Method Qualified Affordable Housing Project Investments, Amortization 3,431 $ 3,152  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (3,673) (3,092)  
Low Income Housing Tax Credits      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 124,454   126,537
Qualified Affordable Housing Project Investments, Commitment 69,356   70,690
Amortization Method Qualified Affordable Housing Project Investments, Amortization 3,327 3,048  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (3,540) (2,959)  
Historic tax credit [Member]      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 17,108   17,108
Qualified Affordable Housing Project Investments, Commitment 11,955   11,955
Amortization Method Qualified Affordable Housing Project Investments, Amortization 0 0  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (80) (80)  
New Markets Tax Credit      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 2,695   2,944
Qualified Affordable Housing Project Investments, Commitment 0   0
Amortization Method Qualified Affordable Housing Project Investments, Amortization 104 104  
Affordable Housing Tax Credits and Other Tax Benefits, Amount (53) (53)  
Renewable Energy Program      
Summary of Investment Holdings [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments 24,417   11,851
Qualified Affordable Housing Project Investments, Commitment 13,008   $ 1,689
Amortization Method Qualified Affordable Housing Project Investments, Amortization 0 0  
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ 0 $ 0