Derivatives (Derivative Instruments and Hedging Activities) (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Included in Other Assets:
Interest Rate Swaps, Notional Amount	$ 87,800	$ 67,900
Other Assets
Included in Other Assets:
Interest Rate Swaps, Notional Amount	87,788	67,902
Interest Rate Swaps, Fair Value	1,564	1,291
Other Liabilities
Included in Other Liabilities:
Interest Rate Swaps, Notional Amount	87,788	67,902
Interest Rate Swaps, Fair Value	$ 1,633	$ 1,238