5. Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Less than 12 months, Estimated Fair Value	$ 84,536	$ 123,127
Less than 12 months, Unrealized Loss	(1,669)	(3,876)
12 months or more, Estimated Fair Value	23,311	22,303
12 months or more, Unrealized Loss	(797)	(809)
Total Estimated Fair Value	107,847	145,430
Total Unrealized Loss	(2,466)	(4,685)
Temporarily Impaired Securities Member
Less than 12 months, Estimated Fair Value	84,536	123,127
Less than 12 months, Unrealized Loss	(1,667)	(3,876)
12 months or more, Estimated Fair Value	23,311	22,302
12 months or more, Unrealized Loss	(797)	(807)
Total Estimated Fair Value	107,847	145,429
Total Unrealized Loss	(2,464)	(4,683)
Temporarily Impaired Securities Member | U S Government Corporations And Agencies Securities [Member]
Less than 12 months, Estimated Fair Value	7,256	10,868
Less than 12 months, Unrealized Loss	(78)	(118)
12 months or more, Estimated Fair Value
12 months or more, Unrealized Loss
Total Estimated Fair Value	7,256	10,868
Total Unrealized Loss	(78)	(118)
Temporarily Impaired Securities Member | Government Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	33,536	55,035
Less than 12 months, Unrealized Loss	(763)	(1,385)
12 months or more, Estimated Fair Value	12,566	13,249
12 months or more, Unrealized Loss	(297)	(188)
Total Estimated Fair Value	46,102	68,284
Total Unrealized Loss	(1,060)	(1,573)
Temporarily Impaired Securities Member | Nongovernment Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	2,162	2,407
Less than 12 months, Unrealized Loss	(10)	(12)
12 months or more, Estimated Fair Value	409	565
12 months or more, Unrealized Loss	(7)	(7)
Total Estimated Fair Value	2,571	2,972
Total Unrealized Loss	(17)	(19)
Temporarily Impaired Securities Member | State and Political Subdivisions General Obligations [Member]
Less than 12 months, Estimated Fair Value	4,026	4,505
Less than 12 months, Unrealized Loss	(135)	(264)
12 months or more, Estimated Fair Value	1,162	2,337
12 months or more, Unrealized Loss	(74)	(211)
Total Estimated Fair Value	5,188	6,842
Total Unrealized Loss	(209)	(475)
Temporarily Impaired Securities Member | State and Political Subdivisions Water and Sewer Revenues [Member]
Less than 12 months, Estimated Fair Value	250	1,309
Less than 12 months, Unrealized Loss	(6)	(31)
12 months or more, Estimated Fair Value	1,577	1,554
12 months or more, Unrealized Loss	(54)	(83)
Total Estimated Fair Value	1,827	2,863
Total Unrealized Loss	(60)	(114)
Temporarily Impaired Securities Member | State and Political Subdivisions Other Revenues [Member]
Less than 12 months, Estimated Fair Value	2,915	3,142
Less than 12 months, Unrealized Loss	(106)	(142)
12 months or more, Estimated Fair Value
12 months or more, Unrealized Loss
Total Estimated Fair Value	2,915	3,142
Total Unrealized Loss	(106)	(142)
Temporarily Impaired Securities Member | Corporate Debt Securities [Member]
Less than 12 months, Estimated Fair Value	1,996	2,968
Less than 12 months, Unrealized Loss	(4)	(31)
12 months or more, Estimated Fair Value
12 months or more, Unrealized Loss
Total Estimated Fair Value	1,996	2,968
Total Unrealized Loss	(4)	(31)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions General Obligations [Member]
Less than 12 months, Estimated Fair Value	17,901	19,603
Less than 12 months, Unrealized Loss	(346)	(997)
12 months or more, Estimated Fair Value	3,423	2,102
12 months or more, Unrealized Loss	(158)	(157)
Total Estimated Fair Value	21,324	21,705
Total Unrealized Loss	(504)	(1,154)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]
Less than 12 months, Estimated Fair Value	6,301	5,643
Less than 12 months, Unrealized Loss	(85)	(224)
12 months or more, Estimated Fair Value	432	983
12 months or more, Unrealized Loss	(25)	(82)
Total Estimated Fair Value	6,733	6,626
Total Unrealized Loss	(110)	(306)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Lease Revenues [Member]
Less than 12 months, Estimated Fair Value	5,121	6,112
Less than 12 months, Unrealized Loss	(65)	(349)
12 months or more, Estimated Fair Value	2,083	958
12 months or more, Unrealized Loss	(103)	(42)
Total Estimated Fair Value	7,204	7,070
Total Unrealized Loss	(168)	(391)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Lottery/casino Revenues [Member]
Less than 12 months, Estimated Fair Value		2,720
Less than 12 months, Unrealized Loss		(132)
12 months or more, Estimated Fair Value	1,659	554
12 months or more, Unrealized Loss	(79)	(37)
Total Estimated Fair Value	1,659	3,274
Total Unrealized Loss	(79)	(169)
Temporarily Impaired Securities Member | Tax Exempt State and Political Subdivisions Other Revenues [Member]
Less than 12 months, Estimated Fair Value	3,072	8,815
Less than 12 months, Unrealized Loss	(69)	(191)
12 months or more, Estimated Fair Value
12 months or more, Unrealized Loss
Total Estimated Fair Value	3,072	8,815
Total Unrealized Loss	(69)	(191)
Other Than Temporarily Impaired Securities [Member]
Less than 12 months, Estimated Fair Value
Less than 12 months, Unrealized Loss	(2)
12 months or more, Estimated Fair Value		1
12 months or more, Unrealized Loss		(2)
Total Estimated Fair Value		1
Total Unrealized Loss	(2)	(2)
Other Than Temporarily Impaired Securities [Member] | Nongovernment Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value
Less than 12 months, Unrealized Loss	(2)
12 months or more, Estimated Fair Value		1
12 months or more, Unrealized Loss		(2)
Total Estimated Fair Value		1
Total Unrealized Loss	$ (2)	$ (2)