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Debt Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 2,583,800 $ 4,123,091
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (36,285) (89,623)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,835,887 2,850,214
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (423,555) (501,899)
Debt Securities, Available-for-sale, Unrealized Loss Position 5,419,687 6,973,305
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (459,840) (591,522)
U.S. Treasury and agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 100,399 185,042
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (305) (2,770)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 768,214 794,521
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (50,017) (71,077)
Debt Securities, Available-for-sale, Unrealized Loss Position 868,613 979,563
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (50,322) (73,847)
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 484,667 539,440
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (8,995) (8,036)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 273,928 224,973
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (21,207) (24,225)
Debt Securities, Available-for-sale, Unrealized Loss Position 758,595 764,413
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (30,202) (32,261)
Mortgage-backed securities and collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,998,734 3,398,609
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (26,985) (78,817)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,793,745 1,830,720
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (352,331) (406,597)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,792,479 5,229,329
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (379,316) $ (485,414)