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Financial Instruments With Off-Balance Sheet Risk - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loan Purchase Commitments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Outstanding loan commitment under financial instrument off balance sheet risk $ 36,400us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanPurchaseCommitmentsMember		 $ 37,300us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanPurchaseCommitmentsMember
Unused lines of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Outstanding loan commitment under financial instrument off balance sheet risk $ 355us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember		 $ 329us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember