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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost $ 266,123 $ 276,443 $ 275,204
Available for sale securities, Unrealized Gains 6,803 5,576 7,732
Available for sale securities, Unrealized Losses 1,411 1,227 801
Available for sale securities, Estimated Fair Value 271,515 280,792 [1] 282,135
U S Government Corporations And Agencies Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 19,757 20,461 21,650
Available for sale securities, Unrealized Gains 1,231 1,063 1,227
Available for sale securities, Unrealized Losses 49 49 40
Available for sale securities, Estimated Fair Value 20,939 21,475 22,837
Government Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 151,895 145,586 153,904
Available for sale securities, Unrealized Gains 2,594 1,943 3,412
Available for sale securities, Unrealized Losses 596 795 501
Available for sale securities, Estimated Fair Value 153,893 146,734 156,815
Nongovernment Sponsored Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 7,162 7,836 11,034
Available for sale securities, Unrealized Gains 58 82 105
Available for sale securities, Unrealized Losses 56 33 71
Available for sale securities, Estimated Fair Value 7,164 7,885 11,068
U S States And Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost     1,617
Available for sale securities, Unrealized Gains     34
Available for sale securities, Unrealized Losses     0
Available for sale securities, Estimated Fair Value     1,651
State and Policital Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 250 250 1,969
Available for sale securities, Unrealized Gains 0 0 21
Available for sale securities, Unrealized Losses 0 0 0
Available for sale securities, Estimated Fair Value 250 250 1,990
State and Political Subdivisions Lottery/Casino Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost     3,084
Available for sale securities, Unrealized Gains     9
Available for sale securities, Unrealized Losses     28
Available for sale securities, Estimated Fair Value     3,065
State and Policital Subdivisions Other Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost   1,729 1,697
Available for sale securities, Unrealized Gains   0 67
Available for sale securities, Unrealized Losses   26 0
Available for sale securities, Estimated Fair Value   1,703 1,764
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 14,539 14,494 6,675
Available for sale securities, Unrealized Gains 38 0 0
Available for sale securities, Unrealized Losses 662 268 10
Available for sale securities, Estimated Fair Value 13,915 14,226 6,665
Taxable Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 193,603 190,356 201,630
Available for sale securities, Unrealized Gains 3,921 3,088 4,875
Available for sale securities, Unrealized Losses 1,363 1,171 650
Available for sale securities, Estimated Fair Value 196,161 192,273 205,855
State and Political Subdivisions General Obligations [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 40,103 52,490 47,947
Available for sale securities, Unrealized Gains 1,926 1,767 2,050
Available for sale securities, Unrealized Losses 45 41 136
Available for sale securities, Estimated Fair Value 41,984 54,216 49,861
State and Political Subdivisions Water and Sewer Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 7,547 7,614 10,302
Available for sale securities, Unrealized Gains 216 172 278
Available for sale securities, Unrealized Losses 0 0 1
Available for sale securities, Estimated Fair Value 7,763 7,786 10,579
State and Political Subdivisions Special Tax Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 3,022 4,532 2,272
Available for sale securities, Unrealized Gains 64 72 53
Available for sale securities, Unrealized Losses 0 0 0
Available for sale securities, Estimated Fair Value 3,086 4,604 2,325
State and Political Subdivisions Sales Tax Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 2,899    
Available for sale securities, Unrealized Gains 72    
Available for sale securities, Unrealized Losses 0    
Available for sale securities, Estimated Fair Value 2,971    
State and Political Subdivisions Lease Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 6,284 8,671  
Available for sale securities, Unrealized Gains 223 187  
Available for sale securities, Unrealized Losses 0 1  
Available for sale securities, Estimated Fair Value 6,507 8,857  
State and Political Subdivisions Lottery/casino Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost     2,800
Available for sale securities, Unrealized Gains     163
Available for sale securities, Unrealized Losses     0
Available for sale securities, Estimated Fair Value     2,963
State and Political Subdivisions Other Revenues [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 12,588 12,703 10,246
Available for sale securities, Unrealized Gains 381 290 313
Available for sale securities, Unrealized Losses 3 14 14
Available for sale securities, Estimated Fair Value 12,966 12,979 10,545
Tax Exempt Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 72,443 86,010 73,567
Available for sale securities, Unrealized Gains 2,882 2,488 2,857
Available for sale securities, Unrealized Losses 48 56 151
Available for sale securities, Estimated Fair Value 75,277 88,442 76,273
Equity Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total Amortized Cost 77 77 7
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 $ 7
[1] December 31, 2015 financial information has been extracted from audited consolidated financial statements