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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 255,578 $ 276,443 $ 266,839
Available for sale securities, Unrealized Gains 7,206 5,576 6,258
Available for sale securities, Unrealized Losses 682 1,227 970
Available for sale securities, Estimated Fair Value 262,102 280,792 [1] 272,127
U S Government Corporations And Agencies Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 14,818 20,461 26,816
Available for sale securities, Unrealized Gains 921 1,063 1,275
Available for sale securities, Unrealized Losses 47 49 37
Available for sale securities, Estimated Fair Value 15,692 21,475 28,054
Government Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 132,913 145,586 141,116
Available for sale securities, Unrealized Gains 2,556 1,943 2,854
Available for sale securities, Unrealized Losses 264 795 406
Available for sale securities, Estimated Fair Value 135,205 146,734 143,564
Nongovernment Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 5,382 7,836 8,641
Available for sale securities, Unrealized Gains 48 82 96
Available for sale securities, Unrealized Losses 29 33 36
Available for sale securities, Estimated Fair Value 5,401 7,885 8,701
State and Policital Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 250 250 500
Available for sale securities, Unrealized Gains 0 0 1
Available for sale securities, Unrealized Losses 0 0 0
Available for sale securities, Estimated Fair Value 250 250 501
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   1,729 1,733
Available for sale securities, Unrealized Gains   0 7
Available for sale securities, Unrealized Losses   26 0
Available for sale securities, Estimated Fair Value   1,703 1,740
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 20,003 14,494 10,796
Available for sale securities, Unrealized Gains 49 0 17
Available for sale securities, Unrealized Losses 149 268 144
Available for sale securities, Estimated Fair Value 19,903 14,226 10,669
Taxable Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 173,366 190,356 190,816
Available for sale securities, Unrealized Gains 3,574 3,088 4,250
Available for sale securities, Unrealized Losses 489 1,171 652
Available for sale securities, Estimated Fair Value 176,451 192,273 194,414
State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 47,014 52,490 47,618
Available for sale securities, Unrealized Gains 2,221 1,767 1,638
Available for sale securities, Unrealized Losses 115 41 197
Available for sale securities, Estimated Fair Value 49,120 54,216 49,059
State and Political Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 7,980 7,614 8,954
Available for sale securities, Unrealized Gains 265 172 94
Available for sale securities, Unrealized Losses 11 0 9
Available for sale securities, Estimated Fair Value 8,234 7,786 9,039
State and Political Subdivisions Special Tax Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost   4,532 4,540
Available for sale securities, Unrealized Gains   72 46
Available for sale securities, Unrealized Losses   0 55
Available for sale securities, Estimated Fair Value   4,604 4,531
State and Political Subdivisions Sales Tax Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 2,880    
Available for sale securities, Unrealized Gains 124    
Available for sale securities, Unrealized Losses 0    
Available for sale securities, Estimated Fair Value 3,004    
State and Political Subdivisions Lease Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 7,392 8,671 3,982
Available for sale securities, Unrealized Gains 321 187 34
Available for sale securities, Unrealized Losses 38 1 9
Available for sale securities, Estimated Fair Value 7,675 8,857 4,007
State and Political Subdivisions Lottery/casino Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost     3,629
Available for sale securities, Unrealized Gains     11
Available for sale securities, Unrealized Losses     44
Available for sale securities, Estimated Fair Value     3,596
State and Political Subdivisions Other Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 16,869 12,703 7,223
Available for sale securities, Unrealized Gains 701 290 185
Available for sale securities, Unrealized Losses 29 14 4
Available for sale securities, Estimated Fair Value 17,541 12,979 7,404
Tax Exempt Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 82,135 86,010 75,946
Available for sale securities, Unrealized Gains 3,632 2,488 2,008
Available for sale securities, Unrealized Losses 193 56 318
Available for sale securities, Estimated Fair Value 85,574 88,442 77,636
Equity Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total 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
[1] December 31, 2015 financial information has been extracted from audited consolidated financial statements