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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]    
Available-for-Sale, Maturing within one year, Amortized Cost $ 422us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Available-for-Sale, Maturing after one to five years, Amortized Cost 8,975us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 119,536us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Available-for-Sale, Maturing after ten years, Amortized Cost 78,201us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Available-for-Sale, Amortized Cost 207,134us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 202,039us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available-for-Sale, Maturing within one year, Estimated Fair Value 422us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 9,381us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 120,515us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 79,472us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Available-for-Sale, Estimated Fair Value, Total 209,790us-gaap_AvailableForSaleSecuritiesDebtSecurities 204,966us-gaap_AvailableForSaleSecuritiesDebtSecurities
Held-to-Maturity, Maturing after one to five years, Amortized Cost 971us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 6,568us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Held-to-Maturity, Maturing after ten years, Amortized Cost 32,535us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Held-to-Maturity, Amortized Cost 40,074us-gaap_HeldToMaturitySecurities 29,120us-gaap_HeldToMaturitySecurities
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 958us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Held-to-Maturity, Maturing after five to ten years, Estimated Fair Value 6,581us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 32,494us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Held-to-Maturity, Estimated Fair Value, Total $ 40,033us-gaap_HeldToMaturitySecuritiesFairValue $ 29,154us-gaap_HeldToMaturitySecuritiesFairValue