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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 28, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dividends declared (in dollars per share)   $ 0.57 $ 0.55 $ 1.71 $ 1.65
Schedule of Accumulated Other Income (Loss) [Abstract]          
Balance, beginning of period   $ 5,893,356 $ 5,231,970 $ 5,550,957 $ 5,145,419
Net change in unrealized gain (loss)   73,209 341,185 333,866 263,436
Interest revenue, Investment securities   8,642 11,431 27,280 35,641
Loss (gain) on available-for-sale securities, net   (213) 691 (213) 45,828
Other comprehensive income, before income taxes   81,638 353,307 360,933 344,905
Federal and state income taxes   19,292 83,094 84,557 81,094
Other comprehensive income, net of income taxes   62,346 270,213 276,376 263,811
Balance, end of period   6,024,925 5,615,198 6,024,925 5,615,198
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]          
Schedule of Accumulated Other Income (Loss) [Abstract]          
Balance, beginning of period       (412,348) (473,212)
Net change in unrealized gain (loss)       333,866 263,436
Interest revenue, Investment securities       0 0
Loss (gain) on available-for-sale securities, net       (213) 45,828
Other comprehensive income, before income taxes       333,653 309,264
Federal and state income taxes       78,244 72,711
Other comprehensive income, net of income taxes       255,409 236,553
Balance, end of period   (156,939) (236,659) (156,939) (236,659)
AOCI, Accumulated Gain (Loss), Debt Securities, Investment Securities Transferred from Available-for-sale, Parent          
Schedule of Accumulated Other Income (Loss) [Abstract]          
Balance, beginning of period       (90,692) (125,888)
Net change in unrealized gain (loss)       0 0
Interest revenue, Investment securities       27,280 35,641
Loss (gain) on available-for-sale securities, net       0 0
Other comprehensive income, before income taxes       27,280 35,641
Federal and state income taxes       6,313 8,383
Other comprehensive income, net of income taxes       20,967 27,258
Balance, end of period   (69,725) (98,630) (69,725) (98,630)
Accumulated Other Comprehensive Income (Loss) [Member]          
Schedule of Accumulated Other Income (Loss) [Abstract]          
Balance, beginning of period   (289,010) (605,502) (503,040) (599,100)
Net change in unrealized gain (loss)       333,866 263,436
Interest revenue, Investment securities       27,280 35,641
Loss (gain) on available-for-sale securities, net       (213) 45,828
Other comprehensive income, before income taxes       360,933 344,905
Federal and state income taxes       84,557 81,094
Other comprehensive income, net of income taxes   62,346 270,213 276,376 263,811
Balance, end of period   $ (226,664) $ (335,289) $ (226,664) $ (335,289)
Subsequent Event [Member] | O2025Q4DividendsMember          
Dividends Payable, Date Declared Oct. 28, 2025        
Dividends Payable, Amount Per Share $ 0.63        
Dividends Payable, Date to be Paid Nov. 26, 2025        
Dividends Payable, Date of Record Nov. 12, 2025