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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivatives not designated as hedging instruments, fair value      
Fair value of interest rate swaps $ 1,380   $ 352
Interest rate swap contracts not designated as hedging instruments - liabilities, gross $ 1,380   $ 352
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