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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Marketable Securities [Line Items]    
Document Period End Date Sep. 30, 2020  
Total Amortized Cost $ 289,727 $ 272,215
Available for sale securities, Unrealized Gains 11,158 6,455
Available for sale securities, Unrealized Losses 2,896 2,315
Debt Securities, Available-for-sale 297,989 276,355 [1]
U S Government Corporations And Agencies Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 36,818 21,036
Available for sale securities, Unrealized Gains 366 212
Available for sale securities, Unrealized Losses 418 384
Debt Securities, Available-for-sale 36,766 20,864
Government Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 60,678 70,379
Available for sale securities, Unrealized Gains 2,072 1,031
Available for sale securities, Unrealized Losses 399 435
Debt Securities, Available-for-sale 62,351 70,975
Nongovernment Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 15,255 10,253
Available for sale securities, Unrealized Gains 187 17
Available for sale securities, Unrealized Losses 252 41
Debt Securities, Available-for-sale 15,190 10,229
State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 12,756 12,603
Available for sale securities, Unrealized Gains 749 25
Available for sale securities, Unrealized Losses 0 171
Debt Securities, Available-for-sale 13,505 12,457
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 9,602 7,170
Available for sale securities, Unrealized Gains 667 71
Available for sale securities, Unrealized Losses 0 114
Debt Securities, Available-for-sale 10,269 7,127
State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,837 5,310
Available for sale securities, Unrealized Gains 344 25
Available for sale securities, Unrealized Losses 3 77
Debt Securities, Available-for-sale 6,178 5,258
State and Political Subdivisions Income Tax Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,055  
Available for sale securities, Unrealized Gains 435  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 5,490  
State and Political Subdivisions University Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost   5,917
Available for sale securities, Unrealized Gains   164
Available for sale securities, Unrealized Losses   16
Debt Securities, Available-for-sale   6,065
State and Policital Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 15,550 18,831
Available for sale securities, Unrealized Gains 1,309 344
Available for sale securities, Unrealized Losses 1 109
Debt Securities, Available-for-sale 16,858 19,066
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 26,438 18,268
Available for sale securities, Unrealized Gains 42 81
Available for sale securities, Unrealized Losses 524 149
Debt Securities, Available-for-sale 25,956 18,200
Asset-backed Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 47,291 33,826
Available for sale securities, Unrealized Gains 14 0
Available for sale securities, Unrealized Losses 1,270 812
Debt Securities, Available-for-sale 46,035 33,014
Taxable Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 235,280 203,593
Available for sale securities, Unrealized Gains 6,185 1,970
Available for sale securities, Unrealized Losses 2,867 2,308
Debt Securities, Available-for-sale 238,598 203,255
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 29,149 36,673
Available for sale securities, Unrealized Gains 2,828 2,526
Available for sale securities, Unrealized Losses 17 0
Debt Securities, Available-for-sale 31,960 39,199
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 8,290 9,565
Available for sale securities, Unrealized Gains 669 633
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 8,959 10,198
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 7,283 8,455
Available for sale securities, Unrealized Gains 743 598
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 8,026 9,053
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 9,725 13,929
Available for sale securities, Unrealized Gains 733 728
Available for sale securities, Unrealized Losses 12 7
Debt Securities, Available-for-sale 10,446 14,650
Tax Exempt Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 54,447 68,622
Available for sale securities, Unrealized Gains 4,973 4,485
Available for sale securities, Unrealized Losses 29 7
Debt Securities, Available-for-sale $ 59,391 $ 73,100
[1] Derived from audited consolidated financial statements