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Investments In Securities and Fair Value (Schedule Of Unrealized Losses On Investments) (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, unrealized loss position, number of positions 45 51
Government obligations    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value $ 1,449 $ 4,322
Total temporarily impaired securities, less than 12 months, unrealized losses (1) (7)
Total temporarily impaired securities, 12 months or longer, fair value 0 0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 0 0
Debt securities, available-for-sale, unrealized loss position, total 1,449 4,322
Debt securities, available-for-sale, unrealized loss position, accumulated loss (1) (7)
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 2,752 3,221
Total temporarily impaired securities, less than 12 months, unrealized losses (18) (36)
Total temporarily impaired securities, 12 months or longer, fair value 0 0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 0 0
Debt securities, available-for-sale, unrealized loss position, total 2,752 3,221
Debt securities, available-for-sale, unrealized loss position, accumulated loss (18) (36)
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 3,753 12,568
Total temporarily impaired securities, less than 12 months, unrealized losses (35) (216)
Total temporarily impaired securities, 12 months or longer, fair value 2,157 1,100
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (40) (3)
Debt securities, available-for-sale, unrealized loss position, total 5,910 13,668
Debt securities, available-for-sale, unrealized loss position, accumulated loss (75) (219)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value 3,941 6,498
Total temporarily impaired securities, less than 12 months, unrealized losses (24) (68)
Total temporarily impaired securities, 12 months or longer, fair value 397 0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (5) 0
Debt securities, available-for-sale, unrealized loss position, total 4,338 6,498
Debt securities, available-for-sale, unrealized loss position, accumulated loss (29) (68)
Total temporarily impaired securities    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value 11,895 26,609
Total temporarily impaired securities, less than 12 months, unrealized losses (78) (327)
Total temporarily impaired securities, 12 months or longer, fair value 2,554 1,100
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (45) (3)
Debt securities, available-for-sale, unrealized loss position, total 14,449 27,709
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ (123) $ (330)