Securities (Schedule of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	$ 177,303	$ 30,371
Less than 12 Months Unrealized Loss	(2,236)	(216)
12 Months or More Fair Value	154,447	233,538
12 Months or More Unrealized Loss	(3,950)	(5,302)
Total Fair Value	331,750	263,909
Total Unrealized Loss	(6,186)	(5,518)
U.S. Treasury and Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	0	0
Less than 12 Months Unrealized Loss	0	0
12 Months or More Fair Value	9,890	19,561
12 Months or More Unrealized Loss	(110)	(439)
Total Fair Value	9,890	19,561
Total Unrealized Loss	(110)	(439)
Obligations of State and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	55,209	3,765
Less than 12 Months Unrealized Loss	(1,102)	(25)
12 Months or More Fair Value	351	4,298
12 Months or More Unrealized Loss	(8)	(34)
Total Fair Value	55,560	8,063
Total Unrealized Loss	(1,110)	(59)
Mortgage-backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	122,094	26,606
Less than 12 Months Unrealized Loss	(1,134)	(191)
12 Months or More Fair Value	144,206	209,679
12 Months or More Unrealized Loss	(3,832)	(4,829)
Total Fair Value	266,300	236,285
Total Unrealized Loss	(4,966)	(5,020)
Equity Securities
Schedule of Available-for-sale Securities [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