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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 334,090 $ 267,105 $ 253,671
Available for sale securities, Unrealized Gains 4,935 3,005 8,838
Available for sale securities, Unrealized Losses 2,214 3,568 876
Available for sale securities, Estimated Fair Value 336,811 266,542 [1] 261,633
U S Government Corporations And Agencies Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 24,410 14,580 16,815
Available for sale securities, Unrealized Gains 649 642 1,123
Available for sale securities, Unrealized Losses 80 48 53
Available for sale securities, Estimated Fair Value 24,979 15,174 17,885
Government Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 127,422 138,451 136,821
Available for sale securities, Unrealized Gains 1,738 1,554 2,862
Available for sale securities, Unrealized Losses 859 1,159 318
Available for sale securities, Estimated Fair Value 128,301 138,846 139,365
Nongovernment Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 3,280 4,631 6,265
Available for sale securities, Unrealized Gains 44 44 61
Available for sale securities, Unrealized Losses 11 22 41
Available for sale securities, Estimated Fair Value 3,313 4,653 6,285
State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 3,944    
Available for sale securities, Unrealized Gains 12    
Available for sale securities, Unrealized Losses 7    
Available for sale securities, Estimated Fair Value 3,949    
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 15,291    
Available for sale securities, Unrealized Gains 37    
Available for sale securities, Unrealized Losses 36    
Available for sale securities, Estimated Fair Value 15,292    
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 16,176 18,295 19,928
Available for sale securities, Unrealized Gains 34 23 60
Available for sale securities, Unrealized Losses 121 148 460
Available for sale securities, Estimated Fair Value 16,089 18,170 19,528
Taxable Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 190,523 175,957 180,079
Available for sale securities, Unrealized Gains 2,514 2,263 4,106
Available for sale securities, Unrealized Losses 1,114 1,377 872
Available for sale securities, Estimated Fair Value 191,923 176,843 183,313
Tax Exempt State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 69,737 49,449 41,282
Available for sale securities, Unrealized Gains 1,283 569 2,788
Available for sale securities, Unrealized Losses 661 1,388 4
Available for sale securities, Estimated Fair Value 70,359 48,630 44,066
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 22,108 9,087 7,535
Available for sale securities, Unrealized Gains 343 63 360
Available for sale securities, Unrealized Losses 102 149 0
Available for sale securities, Estimated Fair Value 22,349 9,001 7,895
Tax Exempt State and Political Subdivisions Lease Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 14,293 9,037 6,267
Available for sale securities, Unrealized Gains 214 7 458
Available for sale securities, Unrealized Losses 102 201 0
Available for sale securities, Estimated Fair Value 14,405 8,843 6,725
Tax Exempt State and Political Subdivisions Electric Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 4,952 3,247  
Available for sale securities, Unrealized Gains 53 10  
Available for sale securities, Unrealized Losses 24 48  
Available for sale securities, Estimated Fair Value 4,981 3,209  
Tax Exempt State and Political Subdivisions Sales Tax Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 5,853 2,870 2,889
Available for sale securities, Unrealized Gains 84 0 182
Available for sale securities, Unrealized Losses 14 34 0
Available for sale securities, Estimated Fair Value 5,923 2,836 3,071
Tax Exempt State and Political Subdivisions Other Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 26,487 17,321 15,542
Available for sale securities, Unrealized Gains 444 93 944
Available for sale securities, Unrealized Losses 197 371 0
Available for sale securities, Estimated Fair Value 26,734 17,043 16,486
Tax Exempt Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 143,430 91,011 73,515
Available for sale securities, Unrealized Gains 2,421 742 4,732
Available for sale securities, Unrealized Losses 1,100 2,191 4
Available for sale securities, Estimated Fair Value 144,751 89,562 78,243
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