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Investment Securities Available-for-Sale - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]      
Federal Reserve and Federal Home Loan Bank stock $ 34,093   $ 40,104
Allowance for credit losses $ 256   $ 167
Debt securities as percentage of total investment securities 99.90%    
Debt securities weighted average duration 4 years 9 months 18 days    
Gross realized gains on sales of investment securities $ 2,100 $ 1,700  
Gross realized losses on sales of investment 47 0  
Proceeds from sale/call of available-for-sale securities $ 164,569 $ 130,265  
Holdings of securities of any one issuer 10.00%   10.00%
Other Assets      
Debt Securities, Available-for-sale [Line Items]      
Accrued interest on available for sale securities $ 4,500   $ 3,500
Collateral Pledged      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available-for-sale, restricted $ 240,200   $ 268,400