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Securities Sold Under Agreements To Repurchase - Summary of Securities Pledged as Collateral Under Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Offsetting Liabilities [Line Items]      
Securities pledged for repurchase agreements $ 28,925 $ 25,040  
Gross amount of recognized liabilities for repurchase agreements 28,925 25,040 $ 21,613
Amounts related to agreements not included in offsetting disclosures above 0 0  
U.S.Treasury Securities [Member]      
Offsetting Liabilities [Line Items]      
Securities pledged for repurchase agreements 1,761 894  
Obligations of U.S. Government Agencies [Member]      
Offsetting Liabilities [Line Items]      
Securities pledged for repurchase agreements $ 27,164 $ 24,146