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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]    
Fair value of securities $ 11,100 $ 17,500
Debt Securities, Available-for-sale, Restriction Type [Extensible List] us-gaap:CollateralPledgedMember us-gaap:CollateralPledgedMember
Securities sold under repurchase agreements $ 6,323 $ 6,089 [1]
Company's investment in Federal Home Loan Bank stock 3,900 5,100
Company's investment in Federal Reserve Bank stock 2,600 2,300
Investment in primary correspondent bank stock $ 220 $ 220
[1] Derived from audited December 31, 2018 Consolidated Financial Statements.