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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Derivatives not designated as hedging instruments, fair value    
Fair value of interest rate swaps $ 961 $ 942
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 961 942
Effective portion of interest rate cash flow hedge, Fair Value included in accumulated other comprehensive income 550 122
Interest Rate Cash Flow Hedge Asset at Fair Value $ 550  
Interest Rate Cash Flow Hedge Liability at Fair Value   $ 122
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
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet 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
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet   Accrued interest payable and other liabilities
Accumulated other comprehensive income    
Derivatives not designated as hedging instruments, fair value    
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet Accumulated other comprehensive income (1) Accumulated other comprehensive income (1)