Securities (Schedule of Securities with Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Less than 12 Months
Fair Value	$ 403,858	$ 39,227
Unrealized Loss	(13,850)	(195)
12 Months or More
Fair Value	1,735
Unrealized Loss	(88)
Total
Fair Value	405,593	39,227
Unrealized Loss	(13,938)	(195)
U.S. Treasury and Agency Securities [Member]
Less than 12 Months
Fair Value	18,952	19,862
Unrealized Loss	(1,048)	(138)
12 Months or More
Fair Value
Unrealized Loss
Total
Fair Value	18,952	19,862
Unrealized Loss	(1,048)	(138)
Obligations of State and Political Subdivisions [Member]
Less than 12 Months
Fair Value	38,878	1,042
Unrealized Loss	(899)	(12)
12 Months or More
Fair Value
Unrealized Loss
Total
Fair Value	38,878	1,042
Unrealized Loss	(899)	(12)
Mortgage-backed Securities - Residential [Member]
Less than 12 Months
Fair Value	346,028	18,323
Unrealized Loss	(11,903)	(45)
12 Months or More
Fair Value	1,735
Unrealized Loss	(88)
Total
Fair Value	347,763	18,323
Unrealized Loss	(11,991)	(45)
Equity Securities [Member]
Less than 12 Months
Fair Value
Unrealized Loss
12 Months or More
Fair Value
Unrealized Loss
Total
Fair Value
Unrealized Loss