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Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available-for-sale securities    
Due within one year, Amortized Cost $ 1,136us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year but within five years, Amortized Cost 31,823us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years but within ten years, Amortized Cost 64,193us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years, Amortized Cost 155,437us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Amortized Cost 356,640us-gaap_AvailableForSaleSecuritiesAmortizedCost 332,942us-gaap_AvailableForSaleSecuritiesAmortizedCost
Held-to-maturity securities    
Due within one year, Amortized Cost 190us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Due after one year but within five years, Amortized Cost 72,707us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Due after five years but within ten years, Amortized Cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Due after ten years, Amortized Cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Amortized Cost 72,897us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment 57,948us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Available-for-sale securities    
Due within one year, Fair Value 1,143us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year but within five years, Fair Value 31,908us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years but within ten years, Fair Value 67,014us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years, Fair Value 147,448us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fair Value 351,454us-gaap_AvailableForSaleSecurities 326,117us-gaap_AvailableForSaleSecurities
Held-to-maturity securities    
Due within one year, Fair Value 191us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year but within five years, Fair Value 73,096us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years but within ten years, Fair Value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years, Fair Value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fair Value 73,287us-gaap_HeldToMaturitySecuritiesFairValue 57,889us-gaap_HeldToMaturitySecuritiesFairValue
Debt Securities    
Available-for-sale securities    
Amortized Cost 252,589us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Available-for-sale securities    
Fair Value 247,513us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Total Mortgage Backed Securities    
Available-for-sale securities    
Amortized Cost 98,829us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Available-for-sale securities    
Fair Value 98,720us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Equity Securities    
Available-for-sale securities    
Amortized Cost 222us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
226us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale securities    
Fair Value 221us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
239us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Certificates of deposit    
Available-for-sale securities    
Amortized Cost 5,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CertificatesOfDepositMember
 
Available-for-sale securities    
Fair Value $ 5,000us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CertificatesOfDepositMember