Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	$ 276,443	$ 276,631
Available for sale securities, Unrealized Gains	5,576	7,170
Available for sale securities, Unrealized Losses	1,227	967
Available for sale securities, Estimated Fair Value	280,792	282,834
U.S. Government and agencies and corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	20,461	22,153
Available for sale securities, Unrealized Gains	1,063	1,073
Available for sale securities, Unrealized Losses	49	52
Available for sale securities, Estimated Fair Value	21,475	23,174
Government-sponsored agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	145,586	147,951
Available for sale securities, Unrealized Gains	1,943	2,599
Available for sale securities, Unrealized Losses	795	773
Available for sale securities, Estimated Fair Value	146,734	149,777
Nongovernment-sponsored entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	7,836	12,051
Available for sale securities, Unrealized Gains	82	142
Available for sale securities, Unrealized Losses	33	48
Available for sale securities, Estimated Fair Value	7,885	12,145
State and political subdivisions, General obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost		1,975
Available for sale securities, Unrealized Gains		2
Available for sale securities, Unrealized Losses		33
Available for sale securities, Estimated Fair Value		1,944
State and policital subdivisions, Water and sewer revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	250	1,976
Available for sale securities, Unrealized Gains	0	14
Available for sale securities, Unrealized Losses	0	7
Available for sale securities, Estimated Fair Value	250	1,983
State and policital subdivisions, Other revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	1,729	4,696
Available for sale securities, Unrealized Gains	0	73
Available for sale securities, Unrealized Losses	26	2
Available for sale securities, Estimated Fair Value	1,703	4,767
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	14,494	3,776
Available for sale securities, Unrealized Gains	0	0
Available for sale securities, Unrealized Losses	268	0
Available for sale securities, Estimated Fair Value	14,226	3,776
Total taxable debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	190,356	194,578
Available for sale securities, Unrealized Gains	3,088	3,903
Available for sale securities, Unrealized Losses	1,171	915
Available for sale securities, Estimated Fair Value	192,273	197,566
State and political subdivisions, General obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	52,490	49,515
Available for sale securities, Unrealized Gains	1,767	2,338
Available for sale securities, Unrealized Losses	41	12
Available for sale securities, Estimated Fair Value	54,216	51,841
State and political subdivisions, Water and sewer revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	7,614	11,258
Available for sale securities, Unrealized Gains	172	244
Available for sale securities, Unrealized Losses	0	3
Available for sale securities, Estimated Fair Value	7,786	11,499
State and political subdivisions, Lease revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	8,671	4,617
Available for sale securities, Unrealized Gains	187	75
Available for sale securities, Unrealized Losses	1	10
Available for sale securities, Estimated Fair Value	8,857	4,682
State and political subdivisions, Lottery/casino revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost		3,811
Available for sale securities, Unrealized Gains		206
Available for sale securities, Unrealized Losses		9
Available for sale securities, Estimated Fair Value		4,008
State and Political Subdivisions Special Tax Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	4,532
Available for sale securities, Unrealized Gains	72
Available for sale securities, Unrealized Losses	0
Available for sale securities, Estimated Fair Value	4,604
State and political subdivisions, Other revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	12,703	12,845
Available for sale securities, Unrealized Gains	290	404
Available for sale securities, Unrealized Losses	14	18
Available for sale securities, Estimated Fair Value	12,979	13,231
Total tax-exempt debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	86,010	82,046
Available for sale securities, Unrealized Gains	2,488	3,267
Available for sale securities, Unrealized Losses	56	52
Available for sale securities, Estimated Fair Value	88,442	85,261
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	77	7
Available for sale securities, Unrealized Gains	0	0
Available for sale securities, Unrealized Losses	0	0
Available for sale securities, Estimated Fair Value	$ 77	$ 7