5. Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Available for sale securities, Amortized Cost	$ 283,248	$ 289,822	$ 289,614
Available for sale securities, Unrealized Gains	6,339	5,501	3,851
Available for sale securities, Unrealized Losses	1,704	4,143	4,685
Available for sale securities, Estimated Fair Value	287,883	291,180	288,780
U S Government Corporations And Agencies Securities [Member]
Available for sale securities, Amortized Cost	24,998	35,605	29,100
Available for sale securities, Unrealized Gains	885	1,186	675
Available for sale securities, Unrealized Losses	53	27	118
Available for sale securities, Estimated Fair Value	25,830	36,764	29,657
Government Sponsored Agencies [Member]
Available for sale securities, Amortized Cost	155,631	147,738	155,270
Available for sale securities, Unrealized Gains	2,921	2,313	2,019
Available for sale securities, Unrealized Losses	997	1,510	1,573
Available for sale securities, Estimated Fair Value	157,555	148,541	155,716
Nongovernment Sponsored Agencies [Member]
Available for sale securities, Amortized Cost	9,555	12,373	11,519
Available for sale securities, Unrealized Gains	385	326	321
Available for sale securities, Unrealized Losses	9	42	21
Available for sale securities, Estimated Fair Value	9,931	12,657	11,819
U S States And Political Subdivisions General Obligations [Member]
Available for sale securities, Amortized Cost	4,532		9,317
Available for sale securities, Unrealized Gains	9		0
Available for sale securities, Unrealized Losses	144		475
Available for sale securities, Estimated Fair Value	4,397		8,842
State and Policital Subdivisions Water and Sewer Revenues [Member]
Available for sale securities, Amortized Cost	2,382		3,229
Available for sale securities, Unrealized Gains	7		0
Available for sale securities, Unrealized Losses	44		114
Available for sale securities, Estimated Fair Value	2,345		3,115
State and Policital Subdivisions Other Revenues [Member]
Available for sale securities, Amortized Cost	3,319		4,051
Available for sale securities, Unrealized Gains	7		4
Available for sale securities, Unrealized Losses	33		142
Available for sale securities, Estimated Fair Value	3,293		3,913
Corporate Debt Securities [Member]
Available for sale securities, Amortized Cost	0	3,966	3,973
Available for sale securities, Unrealized Gains	0	27	24
Available for sale securities, Unrealized Losses	0	34	31
Available for sale securities, Estimated Fair Value	0	3,959	3,966
Taxable Debt Securities [Member]
Available for sale securities, Amortized Cost	200,417	213,520	216,459
Available for sale securities, Unrealized Gains	4,214	3,854	3,043
Available for sale securities, Unrealized Losses	1,280	2,106	2,474
Available for sale securities, Estimated Fair Value	203,351	215,268	217,028
State and Political Subdivisions General Obligations [Member]
Available for sale securities, Amortized Cost	46,859		41,156
Available for sale securities, Unrealized Gains	1,552		675
Available for sale securities, Unrealized Losses	204		1,154
Available for sale securities, Estimated Fair Value	48,207		40,677
State and Political Subdivisions Water and Sewer Revenues [Member]
Available for sale securities, Amortized Cost	11,868		8,996
Available for sale securities, Unrealized Gains	176		15
Available for sale securities, Unrealized Losses	58		306
Available for sale securities, Estimated Fair Value	11,986		8,705
State and Political Subdivisions Lease Revenues [Member]
Available for sale securities, Amortized Cost	7,990		7,956
Available for sale securities, Unrealized Gains	54		0
Available for sale securities, Unrealized Losses	68		391
Available for sale securities, Estimated Fair Value	7,976		7,565
State and Political Subdivisions Lottery/casino Revenues [Member]
Available for sale securities, Amortized Cost	3,832		4,443
Available for sale securities, Unrealized Gains	145		63
Available for sale securities, Unrealized Losses	41		169
Available for sale securities, Estimated Fair Value	3,936		4,337
State and Political Subdivisions Other Revenues [Member]
Available for sale securities, Amortized Cost	12,205		10,527
Available for sale securities, Unrealized Gains	198		55
Available for sale securities, Unrealized Losses	53		191
Available for sale securities, Estimated Fair Value	12,350		10,391
Tax Exempt Debt Securities [Member]
Available for sale securities, Amortized Cost	82,754	76,225	73,078
Available for sale securities, Unrealized Gains	2,125	1,647	808
Available for sale securities, Unrealized Losses	424	2,037	2,211
Available for sale securities, Estimated Fair Value	84,455	75,835	71,675
Equity Securities [Member]
Available for sale securities, Amortized Cost	77	77	77
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	77	77
State and political subdivisions
Available for sale securities, Amortized Cost		13,838
Available for sale securities, Unrealized Gains		2
Available for sale securities, Unrealized Losses		493
Available for sale securities, Estimated Fair Value		13,347
Tax Exempt Debt Securities Us States And Political Subdivisions [Member]
Available for sale securities, Amortized Cost		76,225
Available for sale securities, Unrealized Gains		1,647
Available for sale securities, Unrealized Losses		2,037
Available for sale securities, Estimated Fair Value		75,835
Tax Exempt Debt Securities Residential Mortgage Backed Securities [Member]
Available for sale securities, Amortized Cost		0
Available for sale securities, Unrealized Gains		0
Available for sale securities, Unrealized Losses		0
Available for sale securities, Estimated Fair Value		$ 0