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Short-Term Borrowings - Summary of Securities Pledged as Collateral Under Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Offsetting Liabilities [Line Items]    
Gross amount of recognized liabilities for repurchase agreements $ 20,887 $ 21,613
Gross amount of recognized liabilities for repurchase agreements 20,887 21,613
Amounts related to agreements not included in offsetting disclosures above 0 0
U.S.Treasury Securities [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 813 876
Gross amount of recognized liabilities for repurchase agreements 813 876
Obligations of U.S. Government Agencies [Member]    
Offsetting Liabilities [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 20,074 20,737
Gross amount of recognized liabilities for repurchase agreements $ 20,074 $ 20,737