Commitments, Contingencies and Derivatives (Interest rate locks) (Details) - Interest Rate Lock Commitments [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Notional Amount	$ 21,746	$ 15,249
Derivative, Fair Value, Net	285	187
Derivative Liability, Fair Value, Gross Liability	(22)	(15)
Derivative Asset, Fair Value, Gross Asset	307	202
Other Liabilities [Member]
Other Commitments [Line Items]
Notional Amount	1,860	2,939
Other Assets [Member]
Other Commitments [Line Items]
Notional Amount	$ 19,886	$ 12,310