Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014		Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	$ 266,839	$ 276,631		$ 276,793
Available for sale securities, Unrealized Gains	6,258	7,170		6,863
Available for sale securities, Unrealized Losses	970	967		1,255
Available for sale securities, Estimated Fair Value	272,127	282,834	[1]	282,401
U S Government Corporations And Agencies Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	26,816	22,153		22,643
Available for sale securities, Unrealized Gains	1,275	1,073		919
Available for sale securities, Unrealized Losses	37	52		47
Available for sale securities, Estimated Fair Value	28,054	23,174		23,515
Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	141,116	147,951		153,095
Available for sale securities, Unrealized Gains	2,854	2,599		2,680
Available for sale securities, Unrealized Losses	406	773		891
Available for sale securities, Estimated Fair Value	143,564	149,777		154,884
Nongovernment Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	8,641	12,051		9,873
Available for sale securities, Unrealized Gains	96	142		323
Available for sale securities, Unrealized Losses	36	48		28
Available for sale securities, Estimated Fair Value	8,701	12,145		10,168
U S States And Political Subdivisions General Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	0	1,975		3,856
Available for sale securities, Unrealized Gains	0	2		16
Available for sale securities, Unrealized Losses	0	33		66
Available for sale securities, Estimated Fair Value	0	1,944		3,806
State and Policital Subdivisions Water and Sewer Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	500	1,976		2,375
Available for sale securities, Unrealized Gains	1	14		5
Available for sale securities, Unrealized Losses	0	7		36
Available for sale securities, Estimated Fair Value	501	1,983		2,344
State and Political Subdivisions Lottery/Casino Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	1,214
Available for sale securities, Unrealized Gains	0
Available for sale securities, Unrealized Losses	29
Available for sale securities, Estimated Fair Value	1,185
State and Policital Subdivisions Other Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	1,733	4,696		3,927
Available for sale securities, Unrealized Gains	7	73		29
Available for sale securities, Unrealized Losses	0	2		12
Available for sale securities, Estimated Fair Value	1,740	4,767		3,944
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	10,796	3,776		0
Available for sale securities, Unrealized Gains	17	0		0
Available for sale securities, Unrealized Losses	144	0		0
Available for sale securities, Estimated Fair Value	10,669	3,776		0
Taxable Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	190,816	194,578		195,769
Available for sale securities, Unrealized Gains	4,250	3,903		3,972
Available for sale securities, Unrealized Losses	652	915		1,080
Available for sale securities, Estimated Fair Value	194,414	197,566		198,661
State and Political Subdivisions General Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	47,618	49,515		46,610
Available for sale securities, Unrealized Gains	1,638	2,338		2,047
Available for sale securities, Unrealized Losses	197	12		62
Available for sale securities, Estimated Fair Value	49,059	51,841		48,595
State and Political Subdivisions Water and Sewer Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	8,954	11,258		12,436
Available for sale securities, Unrealized Gains	94	244		224
Available for sale securities, Unrealized Losses	9	3		25
Available for sale securities, Estimated Fair Value	9,039	11,499		12,635
State and Political Subdivisions Special Tax Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	4,540
Available for sale securities, Unrealized Gains	46
Available for sale securities, Unrealized Losses	55
Available for sale securities, Estimated Fair Value	4,531
State and Political Subdivisions Lease Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost		4,617		5,060
Available for sale securities, Unrealized Gains		75		65
Available for sale securities, Unrealized Losses		10		38
Available for sale securities, Estimated Fair Value		4,682		5,087
State and Political Subdivisions Lottery/casino Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	3,629	3,811		4,287
Available for sale securities, Unrealized Gains	11	206		115
Available for sale securities, Unrealized Losses	44	9		0
Available for sale securities, Estimated Fair Value	3,596	4,008		4,402
State and Political Subdivisions Other Revenues [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	7,223	12,845		12,624
Available for sale securities, Unrealized Gains	185	404		440
Available for sale securities, Unrealized Losses	4	18		50
Available for sale securities, Estimated Fair Value	7,404	13,231		13,014
Tax Exempt Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	75,946	82,046		81,017
Available for sale securities, Unrealized Gains	2,008	3,267		2,891
Available for sale securities, Unrealized Losses	318	52		175
Available for sale securities, Estimated Fair Value	77,636	85,261		83,733
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	77	7		7
Available for sale securities, Unrealized Gains	0	0		0
Available for sale securities, Unrealized Losses	0	0		0
Available for sale securities, Estimated Fair Value	$ 77	$ 7		$ 7

[1] December 31, 2014 financial information has been extracted from audited consolidated financial statements