Investment Securities - Proceeds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Proceeds from the sales and calls of securities and the associated gains and losses
Proceeds	$ 55,184	$ 129,074	$ 161,765
Gross gains	815	1,050	5,599
Gross losses	(174)	(404)	(1,673)
Income tax expense (benefit) related to net realized gains (losses) on sale of securities	$ 300	$ 300	$ 1,600