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Off Balance Sheet Activities - Schedule of Off-Balance Sheet Risks (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commitments to Make Loans [Member] | Fixed Rate [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Off-balance sheet risks, amount, liability	$ 28,831us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_FixedIncomeInterestRateMember	$ 54,556us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_FixedIncomeInterestRateMember
Commitments to Make Loans [Member] | Variable Rate [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Off-balance sheet risks, amount, liability	254,269us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember	155,391us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember
Unused Lines of Credit [Member] | Fixed Rate [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
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Unused Lines of Credit [Member] | Variable Rate [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Off-balance sheet risks, amount, liability	80,428us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember	78,937us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember
Standby Letters of Credit [Member] | Fixed Rate [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
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Standby Letters of Credit [Member] | Variable Rate [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Off-balance sheet risks, amount, liability	$ 15,132us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember	$ 13,520us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember

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- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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