Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	$ 49,087	$ 123,127
Less than 12 months, Unrealized Loss	(600)	(3,876)
12 months or more, Estimated Fair Value	32,701	22,303
12 months or more, Unrealized Loss	(367)	(809)
Total Estimated Fair Value	81,788	145,430
Total Unrealized Loss	(967)	(4,685)
Temporarily Impaired Securities Member
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	49,087	123,127
Less than 12 months, Unrealized Loss	(600)	(3,876)
12 months or more, Estimated Fair Value	32,701	22,302
12 months or more, Unrealized Loss	(367)	(807)
Total Estimated Fair Value	81,788	145,429
Total Unrealized Loss	(967)	(4,683)
Temporarily Impaired Securities Member | U.S. Government and agencies and corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	0	10,868
Less than 12 months, Unrealized Loss	0	(118)
12 months or more, Estimated Fair Value	3,912	0
12 months or more, Unrealized Loss	(52)	0
Total Estimated Fair Value	3,912	10,868
Total Unrealized Loss	(52)	(118)
Temporarily Impaired Securities Member | Government-sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	36,825	55,035
Less than 12 months, Unrealized Loss	(535)	(1,385)
12 months or more, Estimated Fair Value	21,915	13,249
12 months or more, Unrealized Loss	(238)	(188)
Total Estimated Fair Value	58,740	68,284
Total Unrealized Loss	(773)	(1,573)
Temporarily Impaired Securities Member | Nongovernment-sponsored entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	5,488	2,407
Less than 12 months, Unrealized Loss	(44)	(12)
12 months or more, Estimated Fair Value	2,163	565
12 months or more, Unrealized Loss	(4)	(7)
Total Estimated Fair Value	7,651	2,972
Total Unrealized Loss	(48)	(19)
Temporarily Impaired Securities Member | State and political subdivisions, General obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	0	4,505
Less than 12 months, Unrealized Loss	0	(264)
12 months or more, Estimated Fair Value	316	2,337
12 months or more, Unrealized Loss	(33)	(211)
Total Estimated Fair Value	316	6,842
Total Unrealized Loss	(33)	(475)
Temporarily Impaired Securities Member | State and political subdivisions, Water and sewer revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	0	1,309
Less than 12 months, Unrealized Loss	0	(31)
12 months or more, Estimated Fair Value	817	1,554
12 months or more, Unrealized Loss	(7)	(83)
Total Estimated Fair Value	817	2,863
Total Unrealized Loss	(7)	(114)
Temporarily Impaired Securities Member | State and political subdivisions, Other revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	1,098	3,142
Less than 12 months, Unrealized Loss	(2)	(142)
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	1,098	3,142
Total Unrealized Loss	(2)	(142)
Temporarily Impaired Securities Member | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	0	2,968
Less than 12 months, Unrealized Loss	0	(31)
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	0	2,968
Total Unrealized Loss	0	(31)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions General Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	3,708	19,603
Less than 12 months, Unrealized Loss	(8)	(997)
12 months or more, Estimated Fair Value	438	2,102
12 months or more, Unrealized Loss	(4)	(157)
Total Estimated Fair Value	4,146	21,705
Total Unrealized Loss	(12)	(1,154)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	721	5,643
Less than 12 months, Unrealized Loss	(3)	(224)
12 months or more, Estimated Fair Value	0	983
12 months or more, Unrealized Loss	0	(82)
Total Estimated Fair Value	721	6,626
Total Unrealized Loss	(3)	(306)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Lease Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	0	6,112
Less than 12 months, Unrealized Loss	0	(349)
12 months or more, Estimated Fair Value	1,168	958
12 months or more, Unrealized Loss	(10)	(42)
Total Estimated Fair Value	1,168	7,070
Total Unrealized Loss	(10)	(391)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Lottery/casino Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	0	2,720
Less than 12 months, Unrealized Loss	0	(132)
12 months or more, Estimated Fair Value	1,126	554
12 months or more, Unrealized Loss	(9)	(37)
Total Estimated Fair Value	1,126	3,274
Total Unrealized Loss	(9)	(169)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Other Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	1,247	8,815
Less than 12 months, Unrealized Loss	(8)	(191)
12 months or more, Estimated Fair Value	846	0
12 months or more, Unrealized Loss	(10)	0
Total Estimated Fair Value	2,093	8,815
Total Unrealized Loss	(18)	(191)
Other Than Temporarily Impaired Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	0	0
Less than 12 months, Unrealized Loss	0	0
12 months or more, Estimated Fair Value	0	1
12 months or more, Unrealized Loss	0	(2)
Total Estimated Fair Value	0	1
Total Unrealized Loss	0	(2)
Other Than Temporarily Impaired Securities [Member] | Nongovernment-sponsored entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Estimated Fair Value		0
Less than 12 months, Unrealized Loss		0
12 months or more, Estimated Fair Value		1
12 months or more, Unrealized Loss		(2)
Total Estimated Fair Value		1
Total Unrealized Loss		$ (2)