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Securities - Contractual Maturities - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Securities    
Proceeds from maturities, calls and principal repayments of securities $ 9,500,000 $ 6,200,000
Proceeds from calls and maturities of securities 1,000,000.0 1,000,000.0
Gross realized gains on securities   97,000
Gross realized loss on securities $ 0 $ 0