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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost $ 265,778 $ 294,251
Available for sale securities, Unrealized Gains 6,152 1,907
Available for sale securities, Unrealized Losses 2,010 3,011
Debt Securities, Available-for-sale 269,920 293,147 [1]
Tax Exempt State and Political Subdivisions University Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 3,439  
Available for sale securities, Unrealized Gains 101  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 3,540  
U S Government Corporations And Agencies Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 23,807 26,303
Available for sale securities, Unrealized Gains 259 203
Available for sale securities, Unrealized Losses 342 366
Debt Securities, Available-for-sale 23,724 26,140
Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 74,976 80,883
Available for sale securities, Unrealized Gains 974 603
Available for sale securities, Unrealized Losses 616 1,177
Debt Securities, Available-for-sale 75,334 80,309
Nongovernment Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 9,245 611
Available for sale securities, Unrealized Gains 13 4
Available for sale securities, Unrealized Losses 88 1
Debt Securities, Available-for-sale 9,170 614
State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 3,184 6,081
Available for sale securities, Unrealized Gains 69 0
Available for sale securities, Unrealized Losses 0 126
Debt Securities, Available-for-sale 3,253 5,955
State and Policital Subdivisions Other Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 15,680 13,457
Available for sale securities, Unrealized Gains 600 17
Available for sale securities, Unrealized Losses 0 186
Debt Securities, Available-for-sale 16,280 13,288
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 17,267 14,807
Available for sale securities, Unrealized Gains 28 9
Available for sale securities, Unrealized Losses 323 304
Debt Securities, Available-for-sale 16,972 14,512
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 34,078 25,288
Available for sale securities, Unrealized Gains 0 10
Available for sale securities, Unrealized Losses 626 123
Debt Securities, Available-for-sale 33,452 25,175
Taxable Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 181,987 167,430
Available for sale securities, Unrealized Gains 2,025 846
Available for sale securities, Unrealized Losses 1,995 2,283
Debt Securities, Available-for-sale 182,017 165,993
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 43,198 65,626
Available for sale securities, Unrealized Gains 2,352 624
Available for sale securities, Unrealized Losses 2 344
Debt Securities, Available-for-sale 45,548 65,906
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 12,924 20,018
Available for sale securities, Unrealized Gains 621 225
Available for sale securities, Unrealized Losses 0 98
Debt Securities, Available-for-sale 13,545 20,145
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 8,567 10,980
Available for sale securities, Unrealized Gains 485 135
Available for sale securities, Unrealized Losses 0 7
Debt Securities, Available-for-sale 9,052 11,108
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 15,663 30,197
Available for sale securities, Unrealized Gains 568 77
Available for sale securities, Unrealized Losses 13 279
Debt Securities, Available-for-sale 16,218 29,995
Tax Exempt Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 83,791 126,821
Available for sale securities, Unrealized Gains 4,127 1,061
Available for sale securities, Unrealized Losses 15 728
Debt Securities, Available-for-sale 87,903 $ 127,154
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 3,750  
Available for sale securities, Unrealized Gains 82  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale $ 3,832  
[1] Derived from audited consolidated financial statements