Investment Securities, Available-for-sale Securities, Transaction Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses [Abstract]
Proceeds from sales	$ 0	$ 42,228	$ 22,945	$ 42,228
Proceeds from calls	107,777	45,648	166,348	226,371
Gross realized gains	0	376	249	382
Gross realized losses	$ 0	0	0	0
Income tax expense recognized on net gains on sales and calls of securities available for sale		$ 151	$ 100	$ 153