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Securities - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Fair market value of pledged securities $ 94,300 $ 88,400
Restricted stock investment in FHLB stock 4,100 4,100
Federal Reserve Bank stock $ 471 $ 471