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Securities - Additional Information (Detail)
9 Months Ended
Sep. 30, 2020
USD ($)
Security
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Investments Debt And Equity Securities [Abstract]      
Fair value of pledged securities $ 92,300,000   $ 80,300,000
Restricted stock investment in FHLB stock 4,100,000   4,100,000
Federal Reserve Bank stock 471,000   $ 471,000
Proceeds from sale of available-for-sale securities $ 0 $ 0  
Number of securities in an unrealized loss position, Total | Security 25    
Number of securities in continuous unrealized loss position, 12 months or more | Security 8