Investment Securities, Available-for-sale Securities, Transaction Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses [Abstract]
Proceeds from sales	$ 0	$ 118,560	$ 0	$ 118,560
Proceeds from calls	39,301	96,417	180,623	205,414
Gross realized gains	0	1,512	6	1,514
Gross realized losses	0	80	0	80
Income tax expense recognized on net gains on sales and calls of securities available for sale	$ 0	$ 573	$ 2	$ 574