Securities - Proceeds from Sales of Securities and the Resulting Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Proceeds from Sales of Securities and the Resulting Gains and Losses
Proceeds	$ 71,832	$ 108,603	$ 26,944
Gross gains	751	1,008	310
Gross losses	$ (109)	$ (911)	$ (272)