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Investments In Securities and Fair Value (Schedule Of Unrealized Losses On Investments) (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, unrealized loss position, number of positions 59 51
Government obligations    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value   $ 1,488
Total temporarily impaired securities, less than 12 months, unrealized losses   (2)
Total temporarily impaired securities, 12 months or longer, fair value   0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss   0
Debt securities, available-for-sale, unrealized loss position, total   1,488
Debt securities, available-for-sale, unrealized loss position, accumulated loss   (2)
General obligations of U.S. states, territories and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value $ 3,276 5,925
Total temporarily impaired securities, less than 12 months, unrealized losses (18) (23)
Total temporarily impaired securities, 12 months or longer, fair value 2,692 101
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (37) (1)
Debt securities, available-for-sale, unrealized loss position, total 5,968 6,026
Debt securities, available-for-sale, unrealized loss position, accumulated loss (55) (24)
Special revenue issuer obligations of U.S. states, territories and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value 11,709 7,124
Total temporarily impaired securities, less than 12 months, unrealized losses (26) (16)
Total temporarily impaired securities, 12 months or longer, fair value 2,844 3,085
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (41) (50)
Debt securities, available-for-sale, unrealized loss position, total 14,553 10,209
Debt securities, available-for-sale, unrealized loss position, accumulated loss (67) (66)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value 5,832 6,052
Total temporarily impaired securities, less than 12 months, unrealized losses (46) (29)
Total temporarily impaired securities, 12 months or longer, fair value 1,230 296
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (9) (4)
Debt securities, available-for-sale, unrealized loss position, total 7,062 6,348
Debt securities, available-for-sale, unrealized loss position, accumulated loss (55) (33)
Total temporarily impaired securities    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value 20,817 20,589
Total temporarily impaired securities, less than 12 months, unrealized losses (90) (70)
Total temporarily impaired securities, 12 months or longer, fair value 6,766 3,482
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (87) (55)
Debt securities, available-for-sale, unrealized loss position, total 27,583 24,071
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ (177) $ (125)