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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | $ 248,492 us-gaap_AvailableForSaleSecurities | $ 324,509 us-gaap_AvailableForSaleSecurities |
U.S. Treasury [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 25,393 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 25,272 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
U.S. Government Agency [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 119,234 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 172,972 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Mortgage-backed Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 29,562 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 44,792 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
State and Local Governments [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 74,303 us-gaap_AvailableForSaleSecurities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 81,473 us-gaap_AvailableForSaleSecurities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 25,393 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 25,272 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Level 1 [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 25,393 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 25,272 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 1 [Member] | U.S. Treasury [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 25,393 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 25,272 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
Level 1 [Member] | U.S. Government Agency [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale |  |  |
Level 1 [Member] | Mortgage-backed Securities [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale |  |  |
Level 1 [Member] | State and Local Governments [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale |  |  |
Level 2 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 215,168 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 288,891 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 215,168 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 288,891 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 2 [Member] | U.S. Treasury [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale |  |  |
Level 2 [Member] | U.S. Government Agency [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 119,234 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 172,972 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Level 2 [Member] | Mortgage-backed Securities [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 29,562 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 44,792 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Level 2 [Member] | State and Local Governments [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 66,372 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 71,127 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Level 3 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 7,931 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 10,346 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Level 3 [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 7,931 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 10,346 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 3 [Member] | U.S. Treasury [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale |  |  |
Level 3 [Member] | U.S. Government Agency [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale |  |  |
Level 3 [Member] | Mortgage-backed Securities [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale |  |  |
Level 3 [Member] | State and Local Governments [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | 7,931 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 10,346 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 16,408 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Level 3 [Member] | State and Local Governments [Member] | Fair Value on a Recurring Basis [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total Securities Available for Sale | $ 7,931 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | $ 10,346 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |

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