Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Less Than 12 Months
Fair Value	$ 461,713	$ 502,714
Unrealized Losses	(12,349)	(17,370)
More Than 12 Months
Fair Value	76,936	45,958
Unrealized Losses	(7,154)	(9,314)
Total
Fair Value	538,649	548,672
Unrealized Losses	(19,503)	(26,684)
Mortgage Backed Securities - Residential
Less Than 12 Months
Fair Value	53,648	52,524
Unrealized Losses	(1,136)	(1,645)
More Than 12 Months
Fair Value	10,239	6,022
Unrealized Losses	(477)	(347)
Total
Fair Value	63,887	58,546
Unrealized Losses	(1,613)	(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	373,753	406,291
Unrealized Losses	(10,336)	(13,979)
More Than 12 Months
Fair Value	56,666	29,588
Unrealized Losses	(3,028)	(1,920)
Total
Fair Value	430,419	435,879
Unrealized Losses	(13,364)	(15,899)
State and Municipal Obligations
Less Than 12 Months
Fair Value	34,312	43,899
Unrealized Losses	(877)	(1,746)
More Than 12 Months
Fair Value	3,458	2,305
Unrealized Losses	(203)	(176)
Total
Fair Value	37,770	46,204
Unrealized Losses	(1,080)	(1,922)
Collateralized Debt Obligations
Less Than 12 Months
Fair Value	0	0
Unrealized Losses	0	0
More Than 12 Months
Fair Value	6,573	3,686
Unrealized Losses	(3,446)	(6,619)
Total
Fair Value	6,573	3,686
Unrealized Losses	$ (3,446)	$ (6,619)