4. Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Less than 12 months, Estimated Fair Value	$ 123,127	$ 60,463
Less than 12 months, Unrealized Loss	(3,876)	(746)
12 months or more, Estimated Fair Value	22,303	12,417
12 months or more, Unrealized Loss	(809)	(254)
Total Estimated Fair Value	145,430	72,880
Total Unrealized Loss	(4,685)	(1,000)
TemporarilyImpairedSecuritiesMember
Less than 12 months, Estimated Fair Value	123,127	60,198
Less than 12 months, Unrealized Loss	(3,876)	(740)
12 months or more, Estimated Fair Value	22,302	11,824
12 months or more, Unrealized Loss	(807)	(134)
Total Estimated Fair Value	145,429	72,022
Total Unrealized Loss	(4,683)	(874)
TemporarilyImpairedSecuritiesMember | U S Government Corporations And Agencies Securities [Member]
Less than 12 months, Estimated Fair Value	10,868	0
Less than 12 months, Unrealized Loss	(118)	0
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	10,868	0
Total Unrealized Loss	(118)	0
TemporarilyImpairedSecuritiesMember | Government Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	55,035	36,498
Less than 12 months, Unrealized Loss	(1,385)	(414)
12 months or more, Estimated Fair Value	13,249	8,997
12 months or more, Unrealized Loss	(188)	(78)
Total Estimated Fair Value	68,284	45,495
Total Unrealized Loss	(1,573)	(492)
TemporarilyImpairedSecuritiesMember | Nongovernment Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	2,407	0
Less than 12 months, Unrealized Loss	(12)	(4)
12 months or more, Estimated Fair Value	565	1,478
12 months or more, Unrealized Loss	(7)	(14)
Total Estimated Fair Value	2,972	1,478
Total Unrealized Loss	(19)	(18)
TemporarilyImpairedSecuritiesMember | State and Political Subdivisions General Obligations [Member]
Less than 12 months, Estimated Fair Value	4,505	2,526
Less than 12 months, Unrealized Loss	(264)	(57)
12 months or more, Estimated Fair Value	2,337	0
12 months or more, Unrealized Loss	(211)	0
Total Estimated Fair Value	6,842	2,526
Total Unrealized Loss	(475)	(57)
TemporarilyImpairedSecuritiesMember | State and Political Subdivisions Water and Sewer Revenues [Member]
Less than 12 months, Estimated Fair Value	1,309	1,240
Less than 12 months, Unrealized Loss	(31)	(28)
12 months or more, Estimated Fair Value	1,554	387
12 months or more, Unrealized Loss	(83)	(4)
Total Estimated Fair Value	2,863	1,627
Total Unrealized Loss	(114)	(32)
TemporarilyImpairedSecuritiesMember | State and Political Subdivisions Other Revenues [Member]
Less than 12 months, Estimated Fair Value	3,142	0
Less than 12 months, Unrealized Loss	(142)	0
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	3,142	0
Total Unrealized Loss	(142)	0
TemporarilyImpairedSecuritiesMember | Corporate Debt Securities [Member]
Less than 12 months, Estimated Fair Value	2,968	0
Less than 12 months, Unrealized Loss	(31)	0
12 months or more, Estimated Fair Value	0	962
12 months or more, Unrealized Loss	0	(38)
Total Estimated Fair Value	2,968	962
Total Unrealized Loss	(31)	(38)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions General Obligations [Member]
Less than 12 months, Estimated Fair Value	19,603	11,926
Less than 12 months, Unrealized Loss	(997)	(145)
12 months or more, Estimated Fair Value	2,102	0
12 months or more, Unrealized Loss	(157)	0
Total Estimated Fair Value	21,705	11,926
Total Unrealized Loss	(1,154)	(145)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]
Less than 12 months, Estimated Fair Value	5,643	2,534
Less than 12 months, Unrealized Loss	(224)	(47)
12 months or more, Estimated Fair Value	983	0
12 months or more, Unrealized Loss	(82)	0
Total Estimated Fair Value	6,626	2,534
Total Unrealized Loss	(306)	(47)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Lease Revenues [Member]
Less than 12 months, Estimated Fair Value	6,112	1,013
Less than 12 months, Unrealized Loss	(349)	(13)
12 months or more, Estimated Fair Value	958	0
12 months or more, Unrealized Loss	(42)	0
Total Estimated Fair Value	7,070	1,013
Total Unrealized Loss	(391)	(13)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Lottery/casino Revenues [Member]
Less than 12 months, Estimated Fair Value	2,720	1,777
Less than 12 months, Unrealized Loss	(132)	(9)
12 months or more, Estimated Fair Value	554	0
12 months or more, Unrealized Loss	(37)	0
Total Estimated Fair Value	3,274	1,777
Total Unrealized Loss	(169)	(9)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Other Revenues [Member]
Less than 12 months, Estimated Fair Value	8,815	2,684
Less than 12 months, Unrealized Loss	(191)	(23)
12 months or more, Estimated Fair Value		0
12 months or more, Unrealized Loss		0
Total Estimated Fair Value	8,815	2,684
Total Unrealized Loss	(191)	(23)
Other Than Temporarily Impaired Securities [Member]
Less than 12 months, Estimated Fair Value	0	265
Less than 12 months, Unrealized Loss	0	(6)
12 months or more, Estimated Fair Value	1	593
12 months or more, Unrealized Loss	(2)	(120)
Total Estimated Fair Value	1	858
Total Unrealized Loss	(2)	(126)
Other Than Temporarily Impaired Securities [Member] | Nongovernment Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	0	265
Less than 12 months, Unrealized Loss	0	(6)
12 months or more, Estimated Fair Value	1	593
12 months or more, Unrealized Loss	(2)	(120)
Total Estimated Fair Value	1	858
Total Unrealized Loss	$ (2)	$ (126)