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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, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Document Period End Date Sep. 30, 2021  
Total Amortized Cost $ 421,480 $ 277,157
Available for sale securities, Unrealized Gains 7,419 10,715
Available for sale securities, Unrealized Losses 4,158 1,745
Debt Securities, Available-for-sale 424,741 286,127 [1]
U S Government Corporations And Agencies Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 38,611 35,190
Available for sale securities, Unrealized Gains 242 361
Available for sale securities, Unrealized Losses 343 394
Debt Securities, Available-for-sale 38,510 35,157
Government Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 62,313 57,399
Available for sale securities, Unrealized Gains 1,482 1,996
Available for sale securities, Unrealized Losses 467 349
Debt Securities, Available-for-sale 63,328 59,046
Nongovernment Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 20,061 16,799
Available for sale securities, Unrealized Gains 67 132
Available for sale securities, Unrealized Losses 222 244
Debt Securities, Available-for-sale 19,906 16,687
State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 81,480 15,065
Available for sale securities, Unrealized Gains 431 804
Available for sale securities, Unrealized Losses 1,497 4
Debt Securities, Available-for-sale 80,414 15,865
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 15,958 10,176
Available for sale securities, Unrealized Gains 360 620
Available for sale securities, Unrealized Losses 64 0
Debt Securities, Available-for-sale 16,254 10,796
State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,811 4,825
Available for sale securities, Unrealized Gains 240 341
Available for sale securities, Unrealized Losses 33 0
Debt Securities, Available-for-sale 6,018 5,166
State and Political Subdivisions Income Tax Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 6,489 5,052
Available for sale securities, Unrealized Gains 293 376
Available for sale securities, Unrealized Losses 5 0
Debt Securities, Available-for-sale 6,777 5,428
State and Political Subdivisions University Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost   3,022
Available for sale securities, Unrealized Gains   315
Available for sale securities, Unrealized Losses   0
Debt Securities, Available-for-sale   3,337
State and Policital Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 29,988 9,406
Available for sale securities, Unrealized Gains 835 907
Available for sale securities, Unrealized Losses 328 0
Debt Securities, Available-for-sale 30,495 10,313
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 30,973 26,483
Available for sale securities, Unrealized Gains 97 56
Available for sale securities, Unrealized Losses 233 112
Debt Securities, Available-for-sale 30,837 26,427
Asset-backed Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 46,291 46,579
Available for sale securities, Unrealized Gains 286 172
Available for sale securities, Unrealized Losses 85 625
Debt Securities, Available-for-sale 46,492 46,126
Taxable Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 345,312 229,996
Available for sale securities, Unrealized Gains 4,355 6,080
Available for sale securities, Unrealized Losses 3,405 1,728
Debt Securities, Available-for-sale 346,262 234,348
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 48,494 22,213
Available for sale securities, Unrealized Gains 1,479 2,416
Available for sale securities, Unrealized Losses 632 9
Debt Securities, Available-for-sale 49,341 24,620
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 7,474 8,266
Available for sale securities, Unrealized Gains 488 709
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 7,962 8,975
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,635 7,195
Available for sale securities, Unrealized Gains 521 799
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 6,156 7,994
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 14,565 9,487
Available for sale securities, Unrealized Gains 576 711
Available for sale securities, Unrealized Losses 121 8
Debt Securities, Available-for-sale 15,020 10,190
Tax Exempt Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 76,168 47,161
Available for sale securities, Unrealized Gains 3,064 4,635
Available for sale securities, Unrealized Losses 753 17
Debt Securities, Available-for-sale 78,479 $ 51,779
State and Political Subdivisions Sales Tax Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost 7,337  
Available for sale securities, Unrealized Gains 22  
Available for sale securities, Unrealized Losses 128  
Debt Securities, Available-for-sale $ 7,231  
[1] Derived from audited consolidated financial statements