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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]      
Federal Reserve and Federal Home Loan Bank stock $ 54,678   $ 25,748
Provision for credit losses - HTM debt securities 1 $ 1,242  
Provision for credit losses - AFS debt securities 0 14  
Allowance for credit losses 17   17
HTM Allowance for credit losses 1,957   $ 1,956
Debt securities, available-for-sale, realized gain 4 5  
Debt securities, available-for-sale, realized loss 0 (26)  
Gross proceeds from sales and calls $ 27,100 $ 8,400  
Holdings of securities of any one issuer 10.00%   10.00%
Collateral Pledged      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available-for-sale, restricted $ 2,100,000    
Other Assets      
Debt Securities, Available-for-sale [Line Items]      
Accrued interest on available for sale securities 7,800   $ 7,600
Residential mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Unrealized loss 50,000   51,700
Allowance for credit losses $ 0   $ 0