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Securities - Composition of Restricted Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Federal Home Loan Bank stock $ 665 $ 645
Federal Reserve Bank stock 875 875
Community Bankers’ Bank stock 50 50
Total restricted securities $ 1,590 $ 1,570 [1]
[1] Derived from audited consolidated financial statements.