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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
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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 | $ 28,831 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_FixedIncomeInterestRateMember | $ 54,556 us-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 | 254,269 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember | 155,391 us-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] |  |
Off-balance sheet risks, amount, liability | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_FixedIncomeInterestRateMember | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_FixedIncomeInterestRateMember
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 | 80,428 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember | 78,937 us-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] |  |
Off-balance sheet risks, amount, liability | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_FixedIncomeInterestRateMember | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_FixedIncomeInterestRateMember
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 | $ 15,132 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_TradingActivityByTypeAxis = us-gaap_VariableIncomeInterestRateMember | $ 13,520 us-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 + Details
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