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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Total $ 3,982us-gaap_ShortTermBorrowings $ 4,590us-gaap_ShortTermBorrowings
Weighted average interest rate 0.18%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.13%us-gaap_ShortTermDebtWeightedAverageInterestRate
Federal Funds Purchased [Member]    
Short-term Debt [Line Items]    
Total 1,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember		 700us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
Repurchase Agreements [Member]    
Short-term Debt [Line Items]    
Total $ 2,982us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		 $ 3,890us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Short-term Debt [Member]    
Short-term Debt [Line Items]    
End of period interest rate 0.14%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember		 0.15%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember