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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]    
Fair value of securities $ 11,200 $ 11,100
Debt Securities, Available-for-sale, Restriction Type [Extensible List] us-gaap:CollateralPledgedMember us-gaap:CollateralPledgedMember
Securities sold under repurchase agreements $ 3,284 $ 6,525 [1]
Company's investment in Federal Home Loan Bank stock 2,900 2,900
Company's investment in Federal Reserve Bank stock 2,600 2,600
Investment in primary correspondent bank stock $ 220 $ 220
[1] Derived from audited December 31, 2019 Consolidated Financial Statements.