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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value $ 343,018us-gaap_AvailableForSaleSecurities $ 257,770us-gaap_AvailableForSaleSecurities
Equity Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 28us-gaap_AvailableForSaleSecurities
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= us-gaap_EquitySecuritiesMember
Other Investments [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 11,748us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherInvestmentsMember		 10,591us-gaap_AvailableForSaleSecurities
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= us-gaap_OtherInvestmentsMember
Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 343,018us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 257,770us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 331,242us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 11,748us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherInvestmentsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring [Member] | Common Stock [Member] | Equity Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 28us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CommonStockMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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= us-gaap_CommonStockMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 157,374us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
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= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 150,375us-gaap_AvailableForSaleSecurities
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= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Measurements, Recurring [Member] | U.S. Agency-Based Mortgage-Backed Securities [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 8,498us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 7,074us-gaap_AvailableForSaleSecurities
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= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 165,370us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 80,428us-gaap_AvailableForSaleSecurities
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= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 28us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock [Member] | Equity Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 28us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CommonStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 9,302us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CommonStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 331,242us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 237,877us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 331,242us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 237,877us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | States and Political Subdivisions [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 157,374us-gaap_AvailableForSaleSecurities
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= us-gaap_USStatesAndPoliticalSubdivisionsMember
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 150,375us-gaap_AvailableForSaleSecurities
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency-Based Mortgage-Backed Securities [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 8,498us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 7,074us-gaap_AvailableForSaleSecurities
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= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Debt Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 165,370us-gaap_AvailableForSaleSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 80,428us-gaap_AvailableForSaleSecurities
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= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value 11,748us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member]    
Fair Value Measurements Disclosure [Line Items]    
Securities available for sale/Available-for-sale, Fair value $ 11,748us-gaap_AvailableForSaleSecurities
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= us-gaap_OtherInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 $ 10,591us-gaap_AvailableForSaleSecurities
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