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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]    
Fair value of securities $ 18,800 $ 17,500
Debt Securities, Available-for-sale, Restriction Type [Extensible List] us-gaap:CollateralPledgedMember us-gaap:CollateralPledgedMember
Securities sold under repurchase agreements $ 7,220 $ 6,089 [1]
Company's investment in Federal Home Loan Bank stock 5,200 5,100
Company's investment in Federal Reserve Bank stock 2,400 2,300
Investment in primary correspondent bank stock $ 220 $ 220
[1] Derived from audited December 31, 2018 Consolidated Financial Statements.