Securities (Securities with Unrealized Losses, Presented by Length of Time Securities Have Been in Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	$ 88,484	$ 403,858
Less than 12 Months Unrealized Loss	(795)	(13,850)
12 Months or More Fair Value	256,191	1,735
12 Months or More Unrealized Loss	(7,933)	(88)
Total Fair Value	344,675	405,593
Total Unrealized Loss	(8,728)	(13,938)
U.S. Treasury and Agency Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	0	18,952
Less than 12 Months Unrealized Loss	0	(1,048)
12 Months or More Fair Value	19,321	0
12 Months or More Unrealized Loss	(679)	0
Total Fair Value	19,321	18,952
Total Unrealized Loss	(679)	(1,048)
Obligations of State and Political Subdivisions [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	7,935	38,878
Less than 12 Months Unrealized Loss	(33)	(899)
12 Months or More Fair Value	4,835	0
12 Months or More Unrealized Loss	(126)	0
Total Fair Value	12,770	38,878
Total Unrealized Loss	(159)	(899)
Mortgage-backed Securities - Residential [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	80,549	346,028
Less than 12 Months Unrealized Loss	(762)	(11,903)
12 Months or More Fair Value	232,035	1,735
12 Months or More Unrealized Loss	(7,128)	(88)
Total Fair Value	312,584	347,763
Total Unrealized Loss	(7,890)	(11,991)
Equity Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	0	0
Less than 12 Months Unrealized Loss	0	0
12 Months or More Fair Value	0	0
12 Months or More Unrealized Loss	0	0
Total Fair Value	0	0
Total Unrealized Loss	$ 0	$ 0