Investment Securities Available-for-sale gross gains and losses realized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gross gains and gross losses realized from sales of available-for-sale securities:
Gross gains realized	$ 795	$ 1,136	$ 3,358
Gross losses realized	66	738	2,869
Net gain realized	$ 729	$ 398	$ 489