Investment Securities (Details 6) - Trust preferred securities - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cumulative roll forward of credit losses recognized in earnings for trust preferred securities
Beginning balance	$ 140	$ 2,305	$ 351
Credit losses on debt securities for which other-than-temporary impairment has not been previously recognized			1,954
Sale of debt securities		$ (2,165)
Ending balance	$ 140	$ 140	$ 2,305