Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	$ 60,821	$ 60,463
Less than 12 months, Unrealized Loss	(944)	(746)
12 months or more, Estimated Fair Value	7,188	12,417
12 months or more, Unrealized Loss	(168)	(254)
Total Estimated Fair Value	68,009	72,880
Total Unrealized Loss	(1,112)	(1,000)
Temporarily Impaired Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	60,821	60,198
Less than 12 months, Unrealized Loss	(944)	(740)
12 months or more, Estimated Fair Value	6,883	11,824
12 months or more, Unrealized Loss	(100)	(134)
Total Estimated Fair Value	67,704	72,022
Total Unrealized Loss	(1,044)	(874)
Temporarily Impaired Securities [Member] | U. S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value
Less than 12 months, Unrealized Loss
12 months or more, Estimated Fair Value
12 months or more, Unrealized Loss
Total Estimated Fair Value
Total Unrealized Loss
Temporarily Impaired Securities [Member] | Government-Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	39,272	36,498
Less than 12 months, Unrealized Loss	(579)	(414)
12 months or more, Estimated Fair Value	4,228	8,997
12 months or more, Unrealized Loss	(68)	(78)
Total Estimated Fair Value	43,500	45,495
Total Unrealized Loss	(647)	(492)
Temporarily Impaired Securities [Member] | Nongovernment Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	1
Less than 12 months, Unrealized Loss	(5)	(4)
12 months or more, Estimated Fair Value	1,287	1,478
12 months or more, Unrealized Loss	(10)	(14)
Total Estimated Fair Value	1,288	1,478
Total Unrealized Loss	(15)	(18)
Temporarily Impaired Securities [Member] | State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	4,317	3,766
Less than 12 months, Unrealized Loss	(89)	(85)
12 months or more, Estimated Fair Value	387	387
12 months or more, Unrealized Loss	(4)	(4)
Total Estimated Fair Value	4,704	4,153
Total Unrealized Loss	(93)	(89)
Temporarily Impaired Securities [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value
Less than 12 months, Unrealized Loss
12 months or more, Estimated Fair Value	981	962
12 months or more, Unrealized Loss	(18)	(38)
Total Estimated Fair Value	981	962
Total Unrealized Loss	(18)	(38)
Temporarily Impaired Securities [Member] | Tax-Exempt State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	17,231	19,934
Less than 12 months, Unrealized Loss	(271)	(237)
12 months or more, Estimated Fair Value
12 months or more, Unrealized Loss
Total Estimated Fair Value	17,231	19,934
Total Unrealized Loss	(271)	(237)
Other-Than-Temporarily Impaired Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value		265
Less than 12 months, Unrealized Loss		(6)
12 months or more, Estimated Fair Value	305	593
12 months or more, Unrealized Loss	(68)	(120)
Total Estimated Fair Value	305	858
Total Unrealized Loss	(68)	(126)
Other-Than-Temporarily Impaired Securities [Member] | Nongovernment Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value		265
Less than 12 months, Unrealized Loss		(6)
12 months or more, Estimated Fair Value	305	593
12 months or more, Unrealized Loss	(68)	(120)
Total Estimated Fair Value	305	858
Total Unrealized Loss	$ (68)	$ (126)