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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 889,958us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 866,904us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains 9,343us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 9,050us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses (12,331)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss (46,262)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Available for sale 886,970us-gaap_AvailableForSaleSecurities 829,692us-gaap_AvailableForSaleSecurities
U.S. Treasury securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 51,063us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember		 99,835us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Gains 2us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember		 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Losses (1,622)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember		 (15,170)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Available for sale 49,443us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember		 84,665us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
U.S. government agency securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 33,163us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 48,407us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains 748us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 923us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Losses (86)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 (703)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available for sale 33,825us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 48,627us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Obligations of states and state agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 11,160us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember		 11,441us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember
Gross Unrealized Gains 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember		 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember
Gross Unrealized Losses (24)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember		 (798)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember
Available for sale 11,136us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember		 10,643us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_StateAndLocalJurisdictionMember
Municipal bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 33,340us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember		 27,671us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember
Gross Unrealized Gains 127us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember		 751us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember
Gross Unrealized Losses (552)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember		 (1,365)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember
Available for sale 32,915us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember		 27,057us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_MunicipalBondsMember
Obligations of states and political subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 44,500us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 39,112us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Gains 127us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 751us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Losses (576)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 (2,163)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale 44,051us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 37,700us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Residential mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 643,382us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 524,781us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Gross Unrealized Gains 5,854us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 3,967us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Gross Unrealized Losses (4,960)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 (20,719)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Available for sale 644,276us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 508,029us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Trust preferred securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 23,194us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1] 23,333us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1]
Gross Unrealized Gains 296us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1] 113us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1]
Gross Unrealized Losses (2,953)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1] (4,231)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1]
Available for sale 20,537us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1] 19,215us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember		 [1]
Corporate and other debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 73,585us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember		 83,819us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains 1,645us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,682us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Losses (1,218)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember		 (2,103)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
Available for sale 74,012us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember		 83,398us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_CorporateDebtSecuritiesMember
Equity securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 21,071us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember		 47,617us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember
Gross Unrealized Gains 671us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember		 1,614us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember
Gross Unrealized Losses (916)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember		 (1,173)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember
Available for sale $ 20,826us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember		 $ 48,058us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_EquitySecuritiesMember
[1] Includes three pooled trust preferred securities, principally collateralized by securities issued by banks and insurance companies.