Securities Securities (Summary of Gross Realized Gains and Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Gross Realized Gains	$ 1,181	$ 1,591	$ 553
Available-for-sale Securities, Gross Realized Losses	0	(10)	(1)
Gain (Loss) on Sale of Securities, Net	$ 1,181	$ 1,581	$ 552