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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 71,157 $ 1,292,794
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (431) (12,009)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,039,561 2,809,244
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (399,847) (476,099)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,110,718 4,102,038
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (400,278) (488,108)
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 0 99,898
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (1,074)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 842,948 822,245
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (53,780) (77,800)
Debt Securities, Available-for-sale, Unrealized Loss Position 842,948 922,143
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (53,780) (78,874)
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 49,619 103,256
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (308) (580)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 237,547 169,231
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (18,222) (21,030)
Debt Securities, Available-for-sale, Unrealized Loss Position 287,166 272,487
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (18,530) (21,610)
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 21,538 1,089,640
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (123) (10,355)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,959,066 1,817,768
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (327,845) (377,269)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,980,604 2,907,408
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (327,968) $ (387,624)