Securities - (Details 4) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Investments in pooled trust preferred securities
Amortized Cost	$ 528,454
Securities available for sale	526,220	$ 553,584
Trust preferred securities
Investments in pooled trust preferred securities
Amortized Cost	24,844	26,400
Securities available for sale	19,127	$ 19,756
Unrealized Loss	(5,717)
XXIII
Investments in pooled trust preferred securities
Amortized Cost	8,547
Securities available for sale	6,139
Unrealized Loss	$ (2,408)
Issuers Currently in Deferral or Default (percent)	17.00%
XXIV
Investments in pooled trust preferred securities
Amortized Cost	$ 12,076
Securities available for sale	9,963
Unrealized Loss	$ (2,113)
Issuers Currently in Deferral or Default (percent)	29.00%
XXVI
Investments in pooled trust preferred securities
Amortized Cost	$ 4,221
Securities available for sale	3,025
Unrealized Loss	$ (1,196)
Issuers Currently in Deferral or Default (percent)	24.00%