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INVESTMENTS - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items]      
Amortized cost of debt securities transferred to held-to-maturity $ 305,600 $ 305,600  
Fair value of debt securities transferred to held-to-maturity 289,400    
Unrealized losses on debt securities transferred to held-to-maturity 16,200    
Book value of debt securities pledged as collateral 1,676,991   $ 1,466,350
Asset pledged as collateral | Deposits      
Fair Value, Separate Account Investment [Line Items]      
Book value of debt securities pledged as collateral 549,700   $ 531,600
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations | Collateralized Mortgage Obligations      
Fair Value, Separate Account Investment [Line Items]      
Mortgage-backed securities 503,300    
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations | Collateralized Mortgage Backed Securities      
Fair Value, Separate Account Investment [Line Items]      
Mortgage-backed securities 686,800    
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations | SBA asset backed securities      
Fair Value, Separate Account Investment [Line Items]      
Mortgage-backed securities $ 43,700