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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, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Document Period End Date Mar. 31, 2021  
Total Amortized Cost $ 305,989 $ 277,157
Available for sale securities, Unrealized Gains 7,667 10,715
Available for sale securities, Unrealized Losses 2,272 1,745
Debt Securities, Available-for-sale 311,384 286,127 [1]
U S Government Corporations And Agencies Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 43,517 35,190
Available for sale securities, Unrealized Gains 323 361
Available for sale securities, Unrealized Losses 388 394
Debt Securities, Available-for-sale 43,452 35,157
Government Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 59,719 57,399
Available for sale securities, Unrealized Gains 1,719 1,996
Available for sale securities, Unrealized Losses 364 349
Debt Securities, Available-for-sale 61,074 59,046
Nongovernment Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 18,675 16,799
Available for sale securities, Unrealized Gains 123 132
Available for sale securities, Unrealized Losses 307 244
Debt Securities, Available-for-sale 18,491 16,687
State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 23,440 15,065
Available for sale securities, Unrealized Gains 264 804
Available for sale securities, Unrealized Losses 505 4
Debt Securities, Available-for-sale 23,199 15,865
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 11,212 10,176
Available for sale securities, Unrealized Gains 238 620
Available for sale securities, Unrealized Losses 91 0
Debt Securities, Available-for-sale 11,359 10,796
State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,812 4,825
Available for sale securities, Unrealized Gains 148 341
Available for sale securities, Unrealized Losses 73 0
Debt Securities, Available-for-sale 5,887 5,166
State and Political Subdivisions Income Tax Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,050 5,052
Available for sale securities, Unrealized Gains 271 376
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 5,321 5,428
State and Political Subdivisions Jail Authority Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost 4,019  
Available for sale securities, Unrealized Gains 44  
Available for sale securities, Unrealized Losses 25  
Debt Securities, Available-for-sale 4,038  
State and Political Subdivisions Various Tax Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost 3,342  
Available for sale securities, Unrealized Gains 0  
Available for sale securities, Unrealized Losses 184  
Debt Securities, Available-for-sale 3,158  
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 11,060 9,406
Available for sale securities, Unrealized Gains 773 907
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 11,833 10,313
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 29,568 26,483
Available for sale securities, Unrealized Gains 125 56
Available for sale securities, Unrealized Losses 35 112
Debt Securities, Available-for-sale 29,658 26,427
Asset-backed Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 48,022 46,579
Available for sale securities, Unrealized Gains 264 172
Available for sale securities, Unrealized Losses 265 625
Debt Securities, Available-for-sale 48,021 46,126
Taxable Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 263,436 229,996
Available for sale securities, Unrealized Gains 4,292 6,080
Available for sale securities, Unrealized Losses 2,237 1,728
Debt Securities, Available-for-sale 265,491 234,348
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 18,509 22,213
Available for sale securities, Unrealized Gains 1,536 2,416
Available for sale securities, Unrealized Losses 30 9
Debt Securities, Available-for-sale 20,015 24,620
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 8,177 8,266
Available for sale securities, Unrealized Gains 571 709
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 8,748 8,975
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 7,171 7,195
Available for sale securities, Unrealized Gains 640 799
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 7,811 7,994
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 8,696 9,487
Available for sale securities, Unrealized Gains 628 711
Available for sale securities, Unrealized Losses 5 8
Debt Securities, Available-for-sale 9,319 10,190
Tax Exempt Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 42,553 47,161
Available for sale securities, Unrealized Gains 3,375 4,635
Available for sale securities, Unrealized Losses 35 17
Debt Securities, Available-for-sale $ 45,893 $ 51,779
[1] Derived from audited consolidated financial statements