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Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives $ 2,430 $ 1,655
Total Liability Derivatives 5,458 4,547
Derivatives Designated as Hedging Instruments [Member]    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives 1,787 1,208
Total Liability Derivatives 5,458 4,547
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 1,787 1,208
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 3,671 3,339
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 1,787 1,208
Derivatives Not Designated as Hedging Instruments [Member]    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Total Asset Derivatives 643 447
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 $ 643 $ 447