Investment Securities - Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 0	$ 29,724	$ 54,955	$ 55,795
Gross realized gains	0	169	345	171
Gross realized losses	$ 0	$ 72	$ 13	$ 78