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Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost $ 294,985 $ 294,251
Available for sale securities, Unrealized Gains 4,233 1,907
Available for sale securities, Unrealized Losses 2,092 3,011
Debt Securities, Available-for-sale 297,126 293,147 [1]
U S Government Corporations And Agencies Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 25,185 26,303
Available for sale securities, Unrealized Gains 213 203
Available for sale securities, Unrealized Losses 352 366
Debt Securities, Available-for-sale 25,046 26,140
Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 82,661 80,883
Available for sale securities, Unrealized Gains 674 603
Available for sale securities, Unrealized Losses 877 1,177
Debt Securities, Available-for-sale 82,458 80,309
Nongovernment Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 7,818 611
Available for sale securities, Unrealized Gains 4 4
Available for sale securities, Unrealized Losses 93 1
Debt Securities, Available-for-sale 7,729 614
State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 7,071 6,081
Available for sale securities, Unrealized Gains 13 0
Available for sale securities, Unrealized Losses 27 126
Debt Securities, Available-for-sale 7,057 5,955
State and Policital Subdivisions Other Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 13,450 13,457
Available for sale securities, Unrealized Gains 70 17
Available for sale securities, Unrealized Losses 30 186
Debt Securities, Available-for-sale 13,490 13,288
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 15,740 14,807
Available for sale securities, Unrealized Gains 10 9
Available for sale securities, Unrealized Losses 300 304
Debt Securities, Available-for-sale 15,450 14,512
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 34,194 25,288
Available for sale securities, Unrealized Gains 0 10
Available for sale securities, Unrealized Losses 360 123
Debt Securities, Available-for-sale 33,834 25,175
Taxable Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 186,119 167,430
Available for sale securities, Unrealized Gains 984 846
Available for sale securities, Unrealized Losses 2,039 2,283
Debt Securities, Available-for-sale 185,064 165,993
Tax Exempt State and Political Subdivisions General Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 57,027 65,626
Available for sale securities, Unrealized Gains 1,921 624
Available for sale securities, Unrealized Losses 23 344
Debt Securities, Available-for-sale 58,925 65,906
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 15,776 20,018
Available for sale securities, Unrealized Gains 435 225
Available for sale securities, Unrealized Losses 5 98
Debt Securities, Available-for-sale 16,206 20,145
Tax Exempt State and Political Subdivisions Lease Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 11,545 10,980
Available for sale securities, Unrealized Gains 419 135
Available for sale securities, Unrealized Losses 0 7
Debt Securities, Available-for-sale 11,964 11,108
Tax Exempt State and Political Subdivisions Other Revenues [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 24,518 30,197
Available for sale securities, Unrealized Gains 474 77
Available for sale securities, Unrealized Losses 25 279
Debt Securities, Available-for-sale 24,967 29,995
Tax Exempt Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total Amortized Cost 108,866 126,821
Available for sale securities, Unrealized Gains 3,249 1,061
Available for sale securities, Unrealized Losses 53 728
Debt Securities, Available-for-sale $ 112,062 $ 127,154
[1] Derived from audited consolidated financial statements