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INVESTMENT SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Jan. 01, 2021
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]      
Accrued interest on investment securities $ 24,600 $ 29,500  
Allowance for credit losses 245 245  
Carrying value of securities pledged as collateral 1,900,000 941,300  
Securities sold under repurchase agreements 205,600 196,700  
State and municipal      
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]      
Allowance for credit losses $ 245 $ 245  
State and municipal | Cumulative Effect, Period of Adoption, Adjustment      
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]      
Allowance for credit losses     $ 245