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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) - USD ($)
$ in Thousands
Jun. 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 $ 4,276,251 $ 1,292,794
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (60,346) (12,009)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,660,546 2,809,244
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (540,291) (476,099)
Debt Securities, Available-for-sale, Unrealized Loss Position 7,936,797 4,102,038
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (600,637) (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 503,063 99,898
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,498) (1,074)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 913,887 822,245
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (84,842) (77,800)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,416,950 922,143
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (86,340) (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 499,412 103,256
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (7,526) (580)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 221,760 169,231
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (26,160) (21,030)
Debt Securities, Available-for-sale, Unrealized Loss Position 721,172 272,487
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (33,686) (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 3,273,776 1,089,640
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (51,322) (10,355)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,524,899 1,817,768
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (429,289) (377,269)
Debt Securities, Available-for-sale, Unrealized Loss Position 5,798,675 2,907,408
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (480,611) $ (387,624)