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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost $ 259,136 $ 294,251
Available for sale securities, Unrealized Gains 7,807 1,907
Available for sale securities, Unrealized Losses 1,596 3,011
Debt Securities, Available-for-sale 265,347 293,147 [1]
U S Government Corporations And Agencies Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 22,186 26,303
Available for sale securities, Unrealized Gains 248 203
Available for sale securities, Unrealized Losses 367 366
Debt Securities, Available-for-sale 22,067 26,140
Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 71,119 80,883
Available for sale securities, Unrealized Gains 1,245 603
Available for sale securities, Unrealized Losses 477 1,177
Debt Securities, Available-for-sale 71,887 80,309
Nongovernment Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 8,057 611
Available for sale securities, Unrealized Gains 19 4
Available for sale securities, Unrealized Losses 38 1
Debt Securities, Available-for-sale 8,038 614
State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 6,716 6,081
Available for sale securities, Unrealized Gains 143 0
Available for sale securities, Unrealized Losses 0 126
Debt Securities, Available-for-sale 6,859 5,955
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 4,752  
Available for sale securities, Unrealized Gains 115  
Available for sale securities, Unrealized Losses 9  
Debt Securities, Available-for-sale 4,858  
State and Political Subdivisions University Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 4,598  
Available for sale securities, Unrealized Gains 244  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 4,842  
State and Policital Subdivisions Other Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 16,590 13,457
Available for sale securities, Unrealized Gains 515 17
Available for sale securities, Unrealized Losses 0 186
Debt Securities, Available-for-sale 17,105 13,288
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 16,553 14,807
Available for sale securities, Unrealized Gains 50 9
Available for sale securities, Unrealized Losses 164 304
Debt Securities, Available-for-sale 16,439 14,512
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 33,957 25,288
Available for sale securities, Unrealized Gains 0 10
Available for sale securities, Unrealized Losses 538 123
Debt Securities, Available-for-sale 33,419 25,175
Taxable Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 184,528 167,430
Available for sale securities, Unrealized Gains 2,579 846
Available for sale securities, Unrealized Losses 1,593 2,283
Debt Securities, Available-for-sale 185,514 165,993
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 41,473 65,626
Available for sale securities, Unrealized Gains 3,095 624
Available for sale securities, Unrealized Losses 0 344
Debt Securities, Available-for-sale 44,568 65,906
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 9,592 20,018
Available for sale securities, Unrealized Gains 672 225
Available for sale securities, Unrealized Losses 0 98
Debt Securities, Available-for-sale 10,264 20,145
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 8,542 10,980
Available for sale securities, Unrealized Gains 650 135
Available for sale securities, Unrealized Losses 0 7
Debt Securities, Available-for-sale 9,192 11,108
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 15,001 30,197
Available for sale securities, Unrealized Gains 811 77
Available for sale securities, Unrealized Losses 3 279
Debt Securities, Available-for-sale 15,809 29,995
Tax Exempt Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 74,608 126,821
Available for sale securities, Unrealized Gains 5,228 1,061
Available for sale securities, Unrealized Losses 3 728
Debt Securities, Available-for-sale $ 79,833 $ 127,154
[1] Derived from audited consolidated financial statements