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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 282,289 $ 267,105 $ 266,123
Available for sale securities, Unrealized Gains 3,070 3,005 6,803
Available for sale securities, Unrealized Losses 3,331 3,568 1,411
Available for sale securities, Estimated Fair Value 282,028 266,542 [1] 271,515
U S Government Corporations And Agencies Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 14,001 14,580 19,757
Available for sale securities, Unrealized Gains 618 642 1,231
Available for sale securities, Unrealized Losses 55 48 49
Available for sale securities, Estimated Fair Value 14,564 15,174 20,939
Government Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 132,920 138,451 151,895
Available for sale securities, Unrealized Gains 1,332 1,554 2,594
Available for sale securities, Unrealized Losses 1,277 1,159 596
Available for sale securities, Estimated Fair Value 132,975 138,846 153,893
Nongovernment Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 3,972 4,631 7,162
Available for sale securities, Unrealized Gains 42 44 58
Available for sale securities, Unrealized Losses 16 22 56
Available for sale securities, Estimated Fair Value 3,998 4,653 7,164
State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 785    
Available for sale securities, Unrealized Gains 0    
Available for sale securities, Unrealized Losses 6    
Available for sale securities, Estimated Fair Value 779    
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 4,217    
Available for sale securities, Unrealized Gains 31    
Available for sale securities, Unrealized Losses 7    
Available for sale securities, Estimated Fair Value 4,241    
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 18,363 18,295 14,539
Available for sale securities, Unrealized Gains 39 23 38
Available for sale securities, Unrealized Losses 93 148 662
Available for sale securities, Estimated Fair Value 18,309 18,170 13,915
Taxable Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 174,258 175,957 193,603
Available for sale securities, Unrealized Gains 2,062 2,263 3,921
Available for sale securities, Unrealized Losses 1,454 1,377 1,363
Available for sale securities, Estimated Fair Value 174,866 176,843 196,161
Tax Exempt State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 57,545 49,449 40,103
Available for sale securities, Unrealized Gains 689 569 1,926
Available for sale securities, Unrealized Losses 1,174 1,388 45
Available for sale securities, Estimated Fair Value 57,060 48,630 41,984
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 12,074 9,087 7,547
Available for sale securities, Unrealized Gains 101 63 216
Available for sale securities, Unrealized Losses 88 149 0
Available for sale securities, Estimated Fair Value 12,087 9,001 7,763
Tax Exempt State and Political Subdivisions Lease Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 9,011 9,037 6,284
Available for sale securities, Unrealized Gains 20 7 223
Available for sale securities, Unrealized Losses 167 201 0
Available for sale securities, Estimated Fair Value 8,864 8,843 6,507
Tax Exempt State and Political Subdivisions Special Tax Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost     3,022
Available for sale securities, Unrealized Gains     64
Available for sale securities, Unrealized Losses     0
Available for sale securities, Estimated Fair Value     3,086
Tax Exempt State and Political Subdivisions Electric Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 3,236 3,247  
Available for sale securities, Unrealized Gains 15 10  
Available for sale securities, Unrealized Losses 74 48  
Available for sale securities, Estimated Fair Value 3,177 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 2,899
Available for sale securities, Unrealized Gains   0 72
Available for sale securities, Unrealized Losses   34 0
Available for sale securities, Estimated Fair Value   2,836 2,971
Tax Exempt State and Political Subdivisions Transit Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 3,404    
Available for sale securities, Unrealized Gains 29    
Available for sale securities, Unrealized Losses 41    
Available for sale securities, Estimated Fair Value 3,392    
Tax Exempt State and Political Subdivisions Other Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 22,624 17,321 12,588
Available for sale securities, Unrealized Gains 154 93 381
Available for sale securities, Unrealized Losses 333 371 3
Available for sale securities, Estimated Fair Value 22,445 17,043 12,966
Tax Exempt Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 107,894 91,011 72,443
Available for sale securities, Unrealized Gains 1,008 742 2,882
Available for sale securities, Unrealized Losses 1,877 2,191 48
Available for sale securities, Estimated Fair Value 107,025 89,562 75,277
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] December 31, 2016 financial information has been extracted from audited consolidated financial statements