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Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives $ 841 $ 159
Total Liability Derivatives 3,390 2,795
Derivatives Designated as Hedging Instruments [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives 372 53
Total Liability Derivatives 3,368 2,773
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives   7
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Other Liabilities [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Liability Derivatives 372 53
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Liabilities [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Liability Derivatives 2,996 2,826
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Assets [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives 372 60
Derivatives Not Designated as Hedging Instruments [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives 469 212
Total Liability Derivatives 22 22
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Liabilities [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Liability Derivatives 22 22
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Assets [Member]
    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives $ 469 $ 212