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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Marketable Securities [Line Items]    
Document Period End Date Mar. 31, 2022  
Total Amortized Cost $ 394,879 $ 398,643
Available for sale securities, Unrealized Gains 1,344 6,223
Available for sale securities, Unrealized Losses 21,368 3,763
Debt Securities, Available-for-sale 374,855 401,103 [1]
U S Government Corporations And Agencies Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 34,193 36,820
Available for sale securities, Unrealized Gains 131 169
Available for sale securities, Unrealized Losses 425 360
Debt Securities, Available-for-sale 33,899 36,629
Government Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 58,521 61,646
Available for sale securities, Unrealized Gains 410 1,153
Available for sale securities, Unrealized Losses 1,738 588
Debt Securities, Available-for-sale 57,193 62,211
Nongovernment Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 32,859 26,839
Available for sale securities, Unrealized Gains 18 26
Available for sale securities, Unrealized Losses 597 279
Debt Securities, Available-for-sale 32,280 26,586
State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 76,033 78,627
Available for sale securities, Unrealized Gains 3 377
Available for sale securities, Unrealized Losses 8,876 1,323
Debt Securities, Available-for-sale 67,160 77,681
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost   9,839
Available for sale securities, Unrealized Gains   294
Available for sale securities, Unrealized Losses   0
Debt Securities, Available-for-sale   10,133
State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost   6,401
Available for sale securities, Unrealized Gains   215
Available for sale securities, Unrealized Losses   26
Debt Securities, Available-for-sale   6,590
State and Political Subdivisions Income Tax Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost   6,487
Available for sale securities, Unrealized Gains   250
Available for sale securities, Unrealized Losses   3
Debt Securities, Available-for-sale   6,734
State and Political Subdivisions Sales Tax Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost   6,909
Available for sale securities, Unrealized Gains   19
Available for sale securities, Unrealized Losses   99
Debt Securities, Available-for-sale   6,829
State and Political Subdivisions Various Tax Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost 13,023 13,031
Available for sale securities, Unrealized Gains 8 218
Available for sale securities, Unrealized Losses 1,170 203
Debt Securities, Available-for-sale 11,861 13,046
State and Political Subdivisions Utility Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost   7,153
Available for sale securities, Unrealized Gains   137
Available for sale securities, Unrealized Losses   130
Debt Securities, Available-for-sale   7,160
State and Policital Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 35,490 9,291
Available for sale securities, Unrealized Gains 34 331
Available for sale securities, Unrealized Losses 2,596 9
Debt Securities, Available-for-sale 32,928 9,613
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 32,818 30,524
Available for sale securities, Unrealized Gains 30 78
Available for sale securities, Unrealized Losses 482 324
Debt Securities, Available-for-sale 32,366 30,278
Asset-backed Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 24,319 24,873
Available for sale securities, Unrealized Gains 38 97
Available for sale securities, Unrealized Losses 280 87
Debt Securities, Available-for-sale 24,077 24,883
Taxable Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 307,256 318,440
Available for sale securities, Unrealized Gains 672 3,364
Available for sale securities, Unrealized Losses 16,164 3,431
Debt Securities, Available-for-sale 291,764 318,373
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 49,441 47,583
Available for sale securities, Unrealized Gains 375 1,526
Available for sale securities, Unrealized Losses 2,953 270
Debt Securities, Available-for-sale 46,863 48,839
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 10,510 10,618
Available for sale securities, Unrealized Gains 76 375
Available for sale securities, Unrealized Losses 505 15
Debt Securities, Available-for-sale 10,081 10,978
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 7,945 7,974
Available for sale securities, Unrealized Gains 144 553
Available for sale securities, Unrealized Losses 232 31
Debt Securities, Available-for-sale 7,857 8,496
Tax Exempt State and Political Subdivisions Various Tax Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost 9,631  
Available for sale securities, Unrealized Gains 21  
Available for sale securities, Unrealized Losses 796  
Debt Securities, Available-for-sale 8,856  
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 10,096 14,028
Available for sale securities, Unrealized Gains 56 405
Available for sale securities, Unrealized Losses 718 16
Debt Securities, Available-for-sale 9,434 14,417
Tax Exempt Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 87,623 80,203
Available for sale securities, Unrealized Gains 672 2,859
Available for sale securities, Unrealized Losses 5,204 332
Debt Securities, Available-for-sale $ 83,091 $ 82,730
[1] Derived from audited consolidated financial statements