Securities - (Details 5) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Investments in pooled trust preferred securities
Amortized Cost	$ 670,172
Securities available for sale	674,447	$ 646,805
Trust preferred securities
Investments in pooled trust preferred securities
Amortized Cost	24,675	24,770
Securities available for sale	18,179	$ 19,469
Unrealized Loss	(6,496)
XXIII
Investments in pooled trust preferred securities
Amortized Cost	8,377
Securities available for sale	5,621
Unrealized Loss	$ (2,756)
Issuers currently in deferral or default (percent)	17.00%
XXIV
Investments in pooled trust preferred securities
Amortized Cost	$ 12,077
Securities available for sale	9,578
Unrealized Loss	$ (2,499)
Issuers currently in deferral or default (percent)	28.00%
XXVI
Investments in pooled trust preferred securities
Amortized Cost	$ 4,221
Securities available for sale	2,980
Unrealized Loss	$ (1,241)
Issuers currently in deferral or default (percent)	25.00%