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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Document Period End Date Jun. 30, 2021  
Total Amortized Cost $ 338,929 $ 277,157
Available for sale securities, Unrealized Gains 8,604 10,715
Available for sale securities, Unrealized Losses 1,791 1,745
Debt Securities, Available-for-sale 345,742 286,127 [1]
U S Government Corporations And Agencies Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 41,717 35,190
Available for sale securities, Unrealized Gains 304 361
Available for sale securities, Unrealized Losses 363 394
Debt Securities, Available-for-sale 41,658 35,157
Government Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 55,274 57,399
Available for sale securities, Unrealized Gains 1,594 1,996
Available for sale securities, Unrealized Losses 295 349
Debt Securities, Available-for-sale 56,573 59,046
Nongovernment Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 17,761 16,799
Available for sale securities, Unrealized Gains 102 132
Available for sale securities, Unrealized Losses 267 244
Debt Securities, Available-for-sale 17,596 16,687
State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 27,669 15,065
Available for sale securities, Unrealized Gains 510 804
Available for sale securities, Unrealized Losses 146 4
Debt Securities, Available-for-sale 28,033 15,865
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 13,955 10,176
Available for sale securities, Unrealized Gains 409 620
Available for sale securities, Unrealized Losses 1 0
Debt Securities, Available-for-sale 14,363 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 262 341
Available for sale securities, Unrealized Losses 21 0
Debt Securities, Available-for-sale 6,053 5,166
State and Political Subdivisions Income Tax Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,047 5,052
Available for sale securities, Unrealized Gains 340 376
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 5,387 5,428
State and Political Subdivisions Jail Authority Revenues    
Marketable Securities [Line Items]    
Total Amortized Cost 4,018  
Available for sale securities, Unrealized Gains 95  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 4,113  
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 Political Subdivisions Insurance Premium Revenue    
Marketable Securities [Line Items]    
Total Amortized Cost 5,070  
Available for sale securities, Unrealized Gains 17  
Available for sale securities, Unrealized Losses 16  
Debt Securities, Available-for-sale 5,071  
State and Policital Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 19,623 9,406
Available for sale securities, Unrealized Gains 920 907
Available for sale securities, Unrealized Losses 111 0
Debt Securities, Available-for-sale 20,432 10,313
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 33,934 26,483
Available for sale securities, Unrealized Gains 97 56
Available for sale securities, Unrealized Losses 181 112
Debt Securities, Available-for-sale 33,850 26,427
Asset-backed Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 47,164 46,579
Available for sale securities, Unrealized Gains 295 172
Available for sale securities, Unrealized Losses 181 625
Debt Securities, Available-for-sale 47,278 46,126
Taxable Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 277,044 229,996
Available for sale securities, Unrealized Gains 4,945 6,080
Available for sale securities, Unrealized Losses 1,582 1,728
Debt Securities, Available-for-sale 280,407 234,348
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 39,530 22,213
Available for sale securities, Unrealized Gains 1,740 2,416
Available for sale securities, Unrealized Losses 208 9
Debt Securities, Available-for-sale 41,062 24,620
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 7,497 8,266
Available for sale securities, Unrealized Gains 618 709
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 8,115 8,975
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,654 7,195
Available for sale securities, Unrealized Gains 573 799
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 6,227 7,994
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 9,204 9,487
Available for sale securities, Unrealized Gains 728 711
Available for sale securities, Unrealized Losses 1 8
Debt Securities, Available-for-sale 9,931 10,190
Tax Exempt Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 61,885 47,161
Available for sale securities, Unrealized Gains 3,659 4,635
Available for sale securities, Unrealized Losses 209 17
Debt Securities, Available-for-sale $ 65,335 $ 51,779
[1] Derived from audited consolidated financial statements