Securities (Details) - Securities Gains (Losses) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gains (losses) on sales of securities:
Gross realized gains	$ 524	$ 2,570	$ 1,689	$ 8,188
Gross realized losses	0	0	(138)	0
Net realized gains on sales of securities	524	2,570	1,551	8,188
Non-cash impairment charges:
Other-than-temporary securities impairment (OTTI)	0	0	0	(28)
Net realized gains	$ 524	$ 2,570	$ 1,551	$ 8,160