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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost $ 272,215 $ 294,251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,455 1,907
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,315 3,011
Debt Securities, Available-for-sale 276,355 293,147
U.S. Government and agencies and corporations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 21,036 26,303
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 212 203
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 384 366
Debt Securities, Available-for-sale 20,864 26,140
Government-sponsored agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 70,379 80,883
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,031 603
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 435 1,177
Debt Securities, Available-for-sale 70,975 80,309
Nongovernment-sponsored entities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 10,253 611
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 17 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 41 1
Debt Securities, Available-for-sale 10,229 614
State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 12,603 6,081
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 25 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 171 126
Debt Securities, Available-for-sale 12,457 5,955
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 7,170  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 71  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 114  
Debt Securities, Available-for-sale 7,127  
State and Political Subdivisions Lease Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 5,310  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 25  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 77  
Debt Securities, Available-for-sale 5,258  
State and Political Subdivisions University Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 5,917  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 164  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 16  
Debt Securities, Available-for-sale 6,065  
State and policital subdivisions, Other revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 18,831 13,457
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 344 17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 109 186
Debt Securities, Available-for-sale 19,066 13,288
Corporate debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 18,268 14,807
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 81 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 149 304
Debt Securities, Available-for-sale 18,200 14,512
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 33,826 25,288
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 10
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 812 123
Debt Securities, Available-for-sale 33,014 25,175
Total taxable debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 203,593 167,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,970 846
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,308 2,283
Debt Securities, Available-for-sale 203,255 165,993
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 36,673 65,626
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,526 624
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 344
Debt Securities, Available-for-sale 39,199 65,906
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 9,565 20,018
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 633 225
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 98
Debt Securities, Available-for-sale 10,198 20,145
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 8,455 10,980
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 598 135
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 7
Debt Securities, Available-for-sale 9,053 11,108
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 13,929 30,197
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 728 77
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 7 279
Debt Securities, Available-for-sale 14,650 29,995
Total tax-exempt debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 68,622 126,821
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,485 1,061
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 7 728
Debt Securities, Available-for-sale $ 73,100 $ 127,154