5. Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Less than 12 months, Estimated Fair Value	$ 113,521	$ 60,463
Less than 12 months, Unrealized Loss	(3,791)	(746)
12 months or more, Estimated Fair Value	15,029	12,417
12 months or more, Unrealized Loss	(363)	(254)
Total Estimated Fair Value	128,550	72,880
Total Unrealized Loss	(4,154)	(1,000)
TemporarilyImpairedSecuritiesMember
Less than 12 months, Estimated Fair Value	113,521	60,198
Less than 12 months, Unrealized Loss	(3,791)	(740)
12 months or more, Estimated Fair Value	15,029	11,824
12 months or more, Unrealized Loss	(363)	(134)
Total Estimated Fair Value	128,550	72,022
Total Unrealized Loss	(4,154)	(874)
TemporarilyImpairedSecuritiesMember | U S Government Corporations And Agencies Securities [Member]
Less than 12 months, Estimated Fair Value	7,770	0
Less than 12 months, Unrealized Loss	(67)	0
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	7,770	0
Total Unrealized Loss	(67)	0
TemporarilyImpairedSecuritiesMember | Government Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	48,957	36,498
Less than 12 months, Unrealized Loss	(1,011)	(414)
12 months or more, Estimated Fair Value	11,754	8,997
12 months or more, Unrealized Loss	(215)	(78)
Total Estimated Fair Value	60,711	45,495
Total Unrealized Loss	(1,226)	(492)
TemporarilyImpairedSecuritiesMember | Nongovernment Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	355	0
Less than 12 months, Unrealized Loss	(1)	(4)
12 months or more, Estimated Fair Value	858	1,478
12 months or more, Unrealized Loss	(8)	(14)
Total Estimated Fair Value	1,213	1,478
Total Unrealized Loss	(9)	(18)
TemporarilyImpairedSecuritiesMember | State and Political Subdivisions General Obligations [Member]
Less than 12 months, Estimated Fair Value	5,806	2,526
Less than 12 months, Unrealized Loss	(316)	(57)
12 months or more, Estimated Fair Value	876	0
12 months or more, Unrealized Loss	(67)	0
Total Estimated Fair Value	6,682	2,526
Total Unrealized Loss	(383)	(57)
TemporarilyImpairedSecuritiesMember | State and Political Subdivisions Water and Sewer Revenues [Member]
Less than 12 months, Estimated Fair Value	634	1,240
Less than 12 months, Unrealized Loss	(35)	(28)
12 months or more, Estimated Fair Value	1,175	387
12 months or more, Unrealized Loss	(56)	(4)
Total Estimated Fair Value	1,809	1,627
Total Unrealized Loss	(91)	(32)
TemporarilyImpairedSecuritiesMember | State and Political Subdivisions Other Revenues [Member]
Less than 12 months, Estimated Fair Value	3,185	0
Less than 12 months, Unrealized Loss	(112)	0
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	3,185	0
Total Unrealized Loss	(112)	0
TemporarilyImpairedSecuritiesMember | Corporate Debt Securities [Member]
Less than 12 months, Estimated Fair Value	2,954	0
Less than 12 months, Unrealized Loss	(45)	0
12 months or more, Estimated Fair Value	0	962
12 months or more, Unrealized Loss	0	(38)
Total Estimated Fair Value	2,954	962
Total Unrealized Loss	(45)	(38)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions General Obligations [Member]
Less than 12 months, Estimated Fair Value	21,134	11,926
Less than 12 months, Unrealized Loss	(1,112)	(145)
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	21,134	11,926
Total Unrealized Loss	(1,112)	(145)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]
Less than 12 months, Estimated Fair Value	6,505	2,534
Less than 12 months, Unrealized Loss	(290)	(47)
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	6,505	2,534
Total Unrealized Loss	(290)	(47)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Lease Revenues [Member]
Less than 12 months, Estimated Fair Value	7,522	1,013
Less than 12 months, Unrealized Loss	(424)	(13)
12 months or more, Estimated Fair Value	366	0
12 months or more, Unrealized Loss	(17)	0
Total Estimated Fair Value	7,888	1,013
Total Unrealized Loss	(441)	(13)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Lottery/casino Revenues [Member]
Less than 12 months, Estimated Fair Value	3,292	1,777
Less than 12 months, Unrealized Loss	(166)	(9)
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	3,292	1,777
Total Unrealized Loss	(166)	(9)
TemporarilyImpairedSecuritiesMember | Tax Exempt State and Political Subdivisions Other Revenues [Member]
Less than 12 months, Estimated Fair Value	5,407	2,684
Less than 12 months, Unrealized Loss	(212)	(23)
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	5,407	2,684
Total Unrealized Loss	(212)	(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	0	593
12 months or more, Unrealized Loss	0	(120)
Total Estimated Fair Value	0	858
Total Unrealized Loss	0	(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	0	593
12 months or more, Unrealized Loss	0	(120)
Total Estimated Fair Value	0	858
Total Unrealized Loss	$ 0	$ (126)