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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivatives not designated as hedging instruments, fair value    
Interest rate swaps - assets $ 942 $ 352
Interest rate swaps - liabilities $ 942 $ 352
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
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