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Derivative Financial Instruments (Fair Value of Derivative Instruments) (Detail) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Derivatives Fair Value [Line Items]    
Derivatives, Assets $ 22,339,000 $ 24,316,000
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 35,668,000 50,247,000
Interest Rate Contract [Member] | Other Assets [Member] | Designated As Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivatives, Assets 725,000 1,419,000
Interest Rate Contract [Member] | Other Assets [Member] | Not Designated As Hedging Instruments [Member]
   
Derivatives Fair Value [Line Items]    
Derivatives, Assets 21,614,000 22,897,000
Interest Rate Contract [Member] | Other Liabilities [Member] | Designated As Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet 17,506,000 31,662,000
Interest Rate Contract [Member] | Other Liabilities [Member] | Not Designated As Hedging Instruments [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Financial Liabilities, Net Amounts Presented In The Consolidated Balance Sheet $ 18,162,000 $ 18,585,000