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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Derivatives not designated as hedging instruments, fair value    
Interest rate swap contracts not designated as hedging instruments - assets, gross $ 1,040 $ 575
Interest rate swap contracts not designated as hedging instruments - liabilities, gross $ 1,040 $ 575
Accrued interest receivable and other assets    
Derivatives not designated as hedging instruments, fair value    
Description of location of interest rate derivative instruments not designated as hedging instruments on balance sheet Accrued interest receivable and other assets Accrued interest receivable and other assets
Accrued interest payable and other liabilities    
Derivatives not designated as hedging instruments, fair value    
Description of location of interest rate derivative instruments not designated as hedging instruments on balance sheet Accrued interest payable and other liabilities Accrued interest payable and other liabilities