Securities (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments in pooled trust preferred securities
Amortized Cost	$ 647,658	$ 724	$ 9,130
Fair Value	646,805	553,584
Trust preferred securities
Investments in pooled trust preferred securities
Amortized Cost	24,770	26,400
Fair Value	19,469	$ 19,756
Unrealized Gain (Loss)	(5,301)
XXIII
Investments in pooled trust preferred securities
Amortized Cost	8,473
Fair Value	5,950
Unrealized Gain (Loss)	$ (2,523)
Issuers Currently in Deferral or Default (percent)	19.00%
XXIV
Investments in pooled trust preferred securities
Amortized Cost	$ 12,076
Fair Value	10,449
Unrealized Gain (Loss)	$ (1,627)
Issuers Currently in Deferral or Default (percent)	28.00%
XXVI
Investments in pooled trust preferred securities
Amortized Cost	$ 4,221
Fair Value	3,070
Unrealized Gain (Loss)	$ (1,151)
Issuers Currently in Deferral or Default (percent)	25.00%