Investment Securities, Available-for-sale Securities, Transaction Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses [Abstract]
Proceeds from sales	$ 0	$ 0	$ 22,945	$ 0
Proceeds from calls	28,891	39,301	58,571	180,623
Gross realized gains	0	0	249	6
Gross realized losses	0	0	0	0
Income tax expense recognized on net gains on sales and calls of securities available for sale	$ 0	$ 0	$ 100	$ 2