Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Less Than 12 Months
Fair Value	$ 97,958	$ 502,714
Unrealized Losses	(671)	(17,370)
More Than 12 Months
Fair Value	338,424	45,958
Unrealized Losses	(12,018)	(9,314)
Total
Fair Value	436,382	548,672
Unrealized Losses	(12,689)	(26,684)
Mortgage Backed Securities - Residential
Less Than 12 Months
Fair Value	4,205	52,524
Unrealized Losses	(30)	(1,645)
More Than 12 Months
Fair Value	53,169	6,022
Unrealized Losses	(912)	(347)
Total
Fair Value	57,374	58,546
Unrealized Losses	(942)	(1,992)
Mortgage Backed Securities - Commercial
Less Than 12 Months
Fair Value		0
Unrealized Losses		0
More Than 12 Months
Fair Value		4,357
Unrealized Losses		(252)
Total
Fair Value		4,357
Unrealized Losses		(252)
Collateralized Mortgage Obligations
Less Than 12 Months
Fair Value	92,936	406,291
Unrealized Losses	(637)	(13,979)
More Than 12 Months
Fair Value	270,267	29,588
Unrealized Losses	(10,821)	(1,920)
Total
Fair Value	363,203	435,879
Unrealized Losses	(11,458)	(15,899)
State and Municipal Obligations
Less Than 12 Months
Fair Value	817	43,899
Unrealized Losses	(4)	(1,746)
More Than 12 Months
Fair Value	14,799	2,305
Unrealized Losses	(257)	(176)
Total
Fair Value	15,616	46,204
Unrealized Losses	(261)	(1,922)
Collateralized Debt Obligations
Less Than 12 Months
Fair Value	0	0
Unrealized Losses	0	0
More Than 12 Months
Fair Value	189	3,686
Unrealized Losses	(28)	(6,619)
Total
Fair Value	189	3,686
Unrealized Losses	$ (28)	$ (6,619)