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Derivative Instruments And Hedging Activities - Summary of Derivative Financial Instruments (Detail) (Mortgages [Member], USD $)
Dec. 31, 2014
Dec. 31, 2013
Other Assets [Member]    
Fair Value Of Derivative Instruments [Line Items]    
Notional Amount $ 38,868,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 $ 66,285,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Fair Value 1,757,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 1,180,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Other Assets [Member] | Forward Contracts Related to Mortgage Loans Held for Sale [Member]    
Fair Value Of Derivative Instruments [Line Items]    
Notional Amount   31,250,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Fair Value   98,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Other Assets [Member] | Interest Rate Lock Commitments [Member]    
Fair Value Of Derivative Instruments [Line Items]    
Notional Amount 38,868,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 35,035,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Fair Value 1,757,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 1,082,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Other Liabilities [Member]    
Fair Value Of Derivative Instruments [Line Items]    
Notional Amount 46,500,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		  
Fair Value 249,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		  
Other Liabilities [Member] | Forward Contracts Related to Mortgage Loans Held for Sale [Member]    
Fair Value Of Derivative Instruments [Line Items]    
Notional Amount 46,500,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		  
Fair Value $ 249,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember