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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost $ 297,463 $ 324,908
Available for sale securities, Unrealized Gains 2,584 5,329
Available for sale securities, Unrealized Losses 3,157 1,514
Available for sale securities, Estimated Fair Value 296,890 328,723 [1]
U S Government Corporations And Agencies Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 32,357 31,260
Available for sale securities, Unrealized Gains 351 498
Available for sale securities, Unrealized Losses 255 145
Available for sale securities, Estimated Fair Value 32,453 31,613
Government Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 102,294 120,948
Available for sale securities, Unrealized Gains 908 1,276
Available for sale securities, Unrealized Losses 1,231 903
Available for sale securities, Estimated Fair Value 101,971 121,321
Nongovernment Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 1,623 2,045
Available for sale securities, Unrealized Gains 31 39
Available for sale securities, Unrealized Losses 5 7
Available for sale securities, Estimated Fair Value 1,649 2,077
State and Political Subdivisions General Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 6,088 6,090
Available for sale securities, Unrealized Gains 0 0
Available for sale securities, Unrealized Losses 184 55
Available for sale securities, Estimated Fair Value 5,904 6,035
State and Policital Subdivisions Other Revenues [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 13,474 11,657
Available for sale securities, Unrealized Gains 3 47
Available for sale securities, Unrealized Losses 283 62
Available for sale securities, Estimated Fair Value 13,194 11,642
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 10,874 16,375
Available for sale securities, Unrealized Gains 0 0
Available for sale securities, Unrealized Losses 146 130
Available for sale securities, Estimated Fair Value 10,728 16,245
Taxable Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 166,710 188,375
Available for sale securities, Unrealized Gains 1,293 1,860
Available for sale securities, Unrealized Losses 2,104 1,302
Available for sale securities, Estimated Fair Value 165,899 188,933
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 57,305 65,560
Available for sale securities, Unrealized Gains 699 1,530
Available for sale securities, Unrealized Losses 560 198
Available for sale securities, Estimated Fair Value 57,444 66,892
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 21,962 23,108
Available for sale securities, Unrealized Gains 183 566
Available for sale securities, Unrealized Losses 94 3
Available for sale securities, Estimated Fair Value 22,051 23,671
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 12,983 13,024
Available for sale securities, Unrealized Gains 149 451
Available for sale securities, Unrealized Losses 22 2
Available for sale securities, Estimated Fair Value 13,110 13,473
Tax Exempt State and Political Subdivisions Electric Revenues [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost   6,205
Available for sale securities, Unrealized Gains   128
Available for sale securities, Unrealized Losses   0
Available for sale securities, Estimated Fair Value   6,333
Tax Exempt State and Political Subdivisions Sales Tax Revenues [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 5,252 4,126
Available for sale securities, Unrealized Gains 25 140
Available for sale securities, Unrealized Losses 41 0
Available for sale securities, Estimated Fair Value 5,236 4,266
Tax Exempt State and Political Subdivisions University Revenues [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost   5,272
Available for sale securities, Unrealized Gains   38
Available for sale securities, Unrealized Losses   9
Available for sale securities, Estimated Fair Value   5,301
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 33,114 19,101
Available for sale securities, Unrealized Gains 235 616
Available for sale securities, Unrealized Losses 336 0
Available for sale securities, Estimated Fair Value 33,013 19,717
Tax Exempt Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 130,616 136,396
Available for sale securities, Unrealized Gains 1,291 3,469
Available for sale securities, Unrealized Losses 1,053 212
Available for sale securities, Estimated Fair Value 130,854 139,653
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total Amortized Cost 137 137
Available for sale securities, Unrealized Gains 0 0
Available for sale securities, Unrealized Losses 0 0
Available for sale securities, Estimated Fair Value $ 137 $ 137
[1] Derived from audited consolidated financial statements