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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Derivatives not designated as hedging instruments, fair value      
Interest rate swap contracts not designated as hedging instruments - assets, gross $ 1,139   $ 552
Interest rate swap contracts not designated as hedging instruments - liabilities, gross $ 1,139   $ 552
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