4. Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Available for sale securities, Amortized Cost	$ 289,614	$ 273,684
Available for sale securities, Unrealized Gains	3,851	8,855
Available for sale securities, Unrealized Losses	4,685	1,000
Available for sale securities, Estimated Fair Value	288,780	281,539
U S Government Corporations And Agencies Securities [Member]
Available for sale securities, Amortized Cost	29,100	28,128
Available for sale securities, Unrealized Gains	675	892
Available for sale securities, Unrealized Losses	118	0
Available for sale securities, Estimated Fair Value	29,657	29,020
Government Sponsored Agencies [Member]
Available for sale securities, Amortized Cost	155,270	133,812
Available for sale securities, Unrealized Gains	2,019	3,250
Available for sale securities, Unrealized Losses	1,573	492
Available for sale securities, Estimated Fair Value	155,716	136,570
Nongovernment Sponsored Agencies [Member]
Available for sale securities, Amortized Cost	11,519	15,380
Available for sale securities, Unrealized Gains	321	509
Available for sale securities, Unrealized Losses	21	144
Available for sale securities, Estimated Fair Value	11,819	15,745
U S States And Political Subdivisions General Obligations [Member]
Available for sale securities, Amortized Cost	9,317	8,847
Available for sale securities, Unrealized Gains	0	58
Available for sale securities, Unrealized Losses	475	57
Available for sale securities, Estimated Fair Value	8,842	8,848
State and Policital Subdivisions Water and Sewer Revenues [Member]
Available for sale securities, Amortized Cost	3,229	1,920
Available for sale securities, Unrealized Gains	0	0
Available for sale securities, Unrealized Losses	114	32
Available for sale securities, Estimated Fair Value	3,115	1,888
State and Policital Subdivisions Other Revenues [Member]
Available for sale securities, Amortized Cost	4,051	1,420
Available for sale securities, Unrealized Gains	4	13
Available for sale securities, Unrealized Losses	142	0
Available for sale securities, Estimated Fair Value	3,913	1,433
Corporate Debt Securities [Member]
Available for sale securities, Amortized Cost	3,973	1,959
Available for sale securities, Unrealized Gains	24	29
Available for sale securities, Unrealized Losses	31	38
Available for sale securities, Estimated Fair Value	3,966	1,950
Taxable Debt Securities [Member]
Available for sale securities, Amortized Cost	216,459	191,466
Available for sale securities, Unrealized Gains	3,043	4,751
Available for sale securities, Unrealized Losses	2,474	763
Available for sale securities, Estimated Fair Value	217,028	195,454
State and Political Subdivisions General Obligations [Member]
Available for sale securities, Amortized Cost	41,156	54,948
Available for sale securities, Unrealized Gains	675	3,259
Available for sale securities, Unrealized Losses	1,154	145
Available for sale securities, Estimated Fair Value	40,677	58,062
State and Political Subdivisions Water and Sewer Revenues [Member]
Available for sale securities, Amortized Cost	8,996	5,773
Available for sale securities, Unrealized Gains	15	171
Available for sale securities, Unrealized Losses	306	47
Available for sale securities, Estimated Fair Value	8,705	5,897
State and Political Subdivisions Lease Revenues [Member]
Available for sale securities, Amortized Cost	7,956	6,910
Available for sale securities, Unrealized Gains		159
Available for sale securities, Unrealized Losses	391	13
Available for sale securities, Estimated Fair Value	7,565	7,056
State and Political Subdivisions Lottery/casino Revenues [Member]
Available for sale securities, Amortized Cost	4,443	4,500
Available for sale securities, Unrealized Gains	63	305
Available for sale securities, Unrealized Losses	169	9
Available for sale securities, Estimated Fair Value	4,337	4,796
State and Political Subdivisions Other Revenues [Member]
Available for sale securities, Amortized Cost	10,527	7,272
Available for sale securities, Unrealized Gains	55	210
Available for sale securities, Unrealized Losses	191	23
Available for sale securities, Estimated Fair Value	10,391	7,459
Tax Exempt Debt Securities Residential Mortgage Backed Securities [Member]
Available for sale securities, Amortized Cost	0	2,738
Available for sale securities, Unrealized Gains	0	0
Available for sale securities, Unrealized Losses	0	0
Available for sale securities, Estimated Fair Value	0	2,738
Tax Exempt Debt Securities [Member]
Available for sale securities, Amortized Cost	73,078	82,141
Available for sale securities, Unrealized Gains	808	4,104
Available for sale securities, Unrealized Losses	2,211	237
Available for sale securities, Estimated Fair Value	71,675	86,008
Equity Securities [Member]
Available for sale securities, Amortized Cost	77	77
Available for sale securities, Unrealized Gains	0	0
Available for sale securities, Unrealized Losses	0	0
Available for sale securities, Estimated Fair Value	$ 77	$ 77