Investment Securities, Proceeds From Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Proceeds from sales and calls of securities [Abstract]
Gross proceeds	$ 105,941	$ 61,335	$ 130,174
Gross gains	250	275	1,204
Gross losses	$ 534	$ 0	$ 1,114