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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 325,397 $ 267,105 $ 255,578
Available for sale securities, Unrealized Gains 5,101 3,005 7,206
Available for sale securities, Unrealized Losses 1,772 3,568 682
Available for sale securities, Estimated Fair Value 328,726 266,542 [1] 262,102
U S Government Corporations And Agencies Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 23,591 14,580 14,818
Available for sale securities, Unrealized Gains 608 642 921
Available for sale securities, Unrealized Losses 64 48 47
Available for sale securities, Estimated Fair Value 24,135 15,174 15,692
Government Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 120,898 138,451 132,913
Available for sale securities, Unrealized Gains 1,580 1,554 2,556
Available for sale securities, Unrealized Losses 719 1,159 264
Available for sale securities, Estimated Fair Value 121,759 138,846 135,205
Nongovernment Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 2,714 4,631 5,382
Available for sale securities, Unrealized Gains 49 44 48
Available for sale securities, Unrealized Losses 8 22 29
Available for sale securities, Estimated Fair Value 2,755 4,653 5,401
State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 2,803    
Available for sale securities, Unrealized Gains 11    
Available for sale securities, Unrealized Losses 1    
Available for sale securities, Estimated Fair Value 2,813    
State and Policital Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost     250
Available for sale securities, Unrealized Gains     0
Available for sale securities, Unrealized Losses     0
Available for sale securities, Estimated Fair Value     250
State and Policital Subdivisions Other Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 10,568    
Available for sale securities, Unrealized Gains 83    
Available for sale securities, Unrealized Losses 29    
Available for sale securities, Estimated Fair Value 10,622    
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 16,326 18,295 20,003
Available for sale securities, Unrealized Gains 0 23 49
Available for sale securities, Unrealized Losses 136 148 149
Available for sale securities, Estimated Fair Value 16,190 18,170 19,903
Taxable Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 176,900 175,957 173,366
Available for sale securities, Unrealized Gains 2,331 2,263 3,574
Available for sale securities, Unrealized Losses 957 1,377 489
Available for sale securities, Estimated Fair Value 178,274 176,843 176,451
Tax Exempt State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 70,714 49,449 47,014
Available for sale securities, Unrealized Gains 1,382 569 2,221
Available for sale securities, Unrealized Losses 510 1,388 115
Available for sale securities, Estimated Fair Value 71,586 48,630 49,120
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 25,049 9,087 7,980
Available for sale securities, Unrealized Gains 433 63 265
Available for sale securities, Unrealized Losses 74 149 11
Available for sale securities, Estimated Fair Value 25,408 9,001 8,234
Tax Exempt State and Political Subdivisions Lease Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 14,250 9,037 7,392
Available for sale securities, Unrealized Gains 283 7 321
Available for sale securities, Unrealized Losses 71 201 38
Available for sale securities, Estimated Fair Value 14,462 8,843 7,675
Tax Exempt State and Political Subdivisions Electric Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 6,226 3,247  
Available for sale securities, Unrealized Gains 76 10  
Available for sale securities, Unrealized Losses 23 48  
Available for sale securities, Estimated Fair Value 6,279 3,209  
Tax Exempt State and Political Subdivisions Sales Tax Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost   2,870 2,880
Available for sale securities, Unrealized Gains   0 124
Available for sale securities, Unrealized Losses   34 0
Available for sale securities, Estimated Fair Value   2,836 3,004
Tax Exempt State and Political Subdivisions University Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 5,290    
Available for sale securities, Unrealized Gains 3    
Available for sale securities, Unrealized Losses 22    
Available for sale securities, Estimated Fair Value 5,271    
Tax Exempt State and Political Subdivisions Other Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 26,831 17,321 16,869
Available for sale securities, Unrealized Gains 593 93 701
Available for sale securities, Unrealized Losses 115 371 29
Available for sale securities, Estimated Fair Value 27,309 17,043 17,541
Tax Exempt Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 148,360 91,011 82,135
Available for sale securities, Unrealized Gains 2,770 742 3,632
Available for sale securities, Unrealized Losses 815 2,191 193
Available for sale securities, Estimated Fair Value 150,315 89,562 85,574
Equity Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 137 137 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 $ 137 $ 137 $ 77
[1] Derived from audited consolidated financial statements