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Investments In Securities and Fair Value (Schedule Of Unrealized Losses On Investments) (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
segment
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, unrealized loss position, number of positions | segment 34 60
Government obligations    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value   $ 0
Total temporarily impaired securities, less than 12 Months, unrealized losses   0
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   0
Debt securities, available-for-sale, unrealized loss position, accumulated loss   0
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 $ 1,416 1,960
Total temporarily impaired securities, less than 12 Months, unrealized losses (33) (2)
Total temporarily impaired securities, 12 months or longer, fair value 2,666 2,780
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (20) (29)
Debt securities, available-for-sale, unrealized loss position, total 4,082 4,740
Debt securities, available-for-sale, unrealized loss position, accumulated loss (53) (31)
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 2,604 5,477
Total temporarily impaired securities, less than 12 Months, unrealized losses (94) (45)
Total temporarily impaired securities, 12 months or longer, fair value 2,821 2,828
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (26) (28)
Debt securities, available-for-sale, unrealized loss position, total 5,425 8,305
Debt securities, available-for-sale, unrealized loss position, accumulated loss (120) (73)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value 7,998 22,641
Total temporarily impaired securities, less than 12 Months, unrealized losses (19) (131)
Total temporarily impaired securities, 12 months or longer, fair value 0 149
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 0 (1)
Debt securities, available-for-sale, unrealized loss position, total 7,998 22,790
Debt securities, available-for-sale, unrealized loss position, accumulated loss (19) (132)
Total temporarily impaired securities    
Debt Securities, Available-for-sale [Line Items]    
Total temporarily impaired securities, less than 12 months, fair value 12,018 30,078
Total temporarily impaired securities, less than 12 Months, unrealized losses (146) (178)
Total temporarily impaired securities, 12 months or longer, fair value 5,487 5,757
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss (46) (58)
Debt securities, available-for-sale, unrealized loss position, total 17,505 35,835
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ (192) $ (236)