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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, 2020
Dec. 31, 2019
Marketable Securities [Line Items]    
Document Period End Date Jun. 30, 2020  
Total Amortized Cost $ 314,864 $ 272,215
Available for sale securities, Unrealized Gains 12,073 6,455
Available for sale securities, Unrealized Losses 4,398 2,315
Debt Securities, Available-for-sale 322,539 276,355 [1]
Debt Securities, Held-to-maturity 80,497 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1,150  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 38  
Debt Securities, Held-to-maturity, Fair Value 81,609 0
Tax Exempt State and Political Subdivisions Sales Tax Revenues [Member]    
Marketable Securities [Line Items]    
Debt Securities, Held-to-maturity 2,923  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 2  
Debt Securities, Held-to-maturity, Fair Value 2,921  
U S Government Corporations And Agencies Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 38,201 21,036
Available for sale securities, Unrealized Gains 388 212
Available for sale securities, Unrealized Losses 450 384
Debt Securities, Available-for-sale 38,139 20,864
Nongovernment Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 12,820 10,253
Available for sale securities, Unrealized Gains 159 17
Available for sale securities, Unrealized Losses 344 41
Debt Securities, Available-for-sale 12,635 10,229
Government Sponsored Agencies [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 64,206 70,379
Available for sale securities, Unrealized Gains 2,260 1,031
Available for sale securities, Unrealized Losses 404 435
Debt Securities, Available-for-sale 66,062 70,975
State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 17,607 12,603
Available for sale securities, Unrealized Gains 710 25
Available for sale securities, Unrealized Losses 5 171
Debt Securities, Available-for-sale 18,312 12,457
State and Policital Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 10,724 7,170
Available for sale securities, Unrealized Gains 552 71
Available for sale securities, Unrealized Losses 2 114
Debt Securities, Available-for-sale 11,274 7,127
State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,310 5,310
Available for sale securities, Unrealized Gains 411 25
Available for sale securities, Unrealized Losses 0 77
Debt Securities, Available-for-sale 5,721 5,258
State and Political Subdivisions Income Tax Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,057  
Available for sale securities, Unrealized Gains 392  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 5,449  
State and Political Subdivisions University Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 5,912 5,917
Available for sale securities, Unrealized Gains 548 164
Available for sale securities, Unrealized Losses 0 16
Debt Securities, Available-for-sale 6,460 6,065
State and Policital Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 13,988 18,831
Available for sale securities, Unrealized Gains 989 344
Available for sale securities, Unrealized Losses 34 109
Debt Securities, Available-for-sale 14,943 19,066
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 23,304 18,268
Available for sale securities, Unrealized Gains 37 81
Available for sale securities, Unrealized Losses 685 149
Debt Securities, Available-for-sale 22,656 18,200
Asset-backed Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 47,763 33,826
Available for sale securities, Unrealized Gains 0 0
Available for sale securities, Unrealized Losses 2,459 812
Debt Securities, Available-for-sale 45,304 33,014
Taxable Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 244,892 203,593
Available for sale securities, Unrealized Gains 6,446 1,970
Available for sale securities, Unrealized Losses 4,383 2,308
Debt Securities, Available-for-sale 246,955 203,255
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 36,328 36,673
Available for sale securities, Unrealized Gains 3,289 2,526
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale 39,617 39,199
Debt Securities, Held-to-maturity 66,626  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 918  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 34  
Debt Securities, Held-to-maturity, Fair Value 67,510  
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 8,873 9,565
Available for sale securities, Unrealized Gains 627 633
Available for sale securities, Unrealized Losses 1 0
Debt Securities, Available-for-sale 9,499 10,198
Debt Securities, Held-to-maturity 6,644  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 86  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0  
Debt Securities, Held-to-maturity, Fair Value 6,730  
Tax Exempt State and Political Subdivisions Transportation Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 6,600  
Available for sale securities, Unrealized Gains 290  
Available for sale securities, Unrealized Losses 0  
Debt Securities, Available-for-sale 6,890  
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 10,865 13,929
Available for sale securities, Unrealized Gains 699 728
Available for sale securities, Unrealized Losses 14 7
Debt Securities, Available-for-sale 11,550 14,650
Debt Securities, Held-to-maturity 4,304  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 146  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 2  
Debt Securities, Held-to-maturity, Fair Value 4,448  
Tax Exempt Debt Securities [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 69,972 68,622
Available for sale securities, Unrealized Gains 5,627 4,485
Available for sale securities, Unrealized Losses 15 7
Debt Securities, Available-for-sale 75,584 73,100
Debt Securities, Held-to-maturity 80,497  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1,150  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 38  
Debt Securities, Held-to-maturity, Fair Value 81,609  
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Marketable Securities [Line Items]    
Total Amortized Cost 7,306 8,455
Available for sale securities, Unrealized Gains 722 598
Available for sale securities, Unrealized Losses 0 0
Debt Securities, Available-for-sale $ 8,028 $ 9,053
[1] Derived from audited consolidated financial statements