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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 29, 2025
Mar. 31, 2025
Mar. 31, 2024
Dividends declared (in dollars per share)   $ 0.57 $ 0.55
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, beginning of period   $ 5,550,957 $ 5,145,419
Net change in unrealized gain (loss)   173,828 (71,806)
Interest revenue, Investment securities   9,444 12,183
Loss on available-for-sale securities, net   0 45,171
Other comprehensive income, before income taxes   183,272 (14,452)
Federal and state income taxes   42,575 (3,424)
Other comprehensive income, net of income taxes   140,697 (11,028)
Balance, end of period   5,774,378 5,131,635
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)   173,828 (71,806)
Interest revenue, Investment securities   0 0
Loss on available-for-sale securities, net   0 45,171
Other comprehensive income, before income taxes   173,828 (26,635)
Federal and state income taxes   40,476 (6,289)
Other comprehensive income, net of income taxes   133,352 (20,346)
Balance, end of period   (278,996) (493,558)
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   9,444 12,183
Loss on available-for-sale securities, net   0 0
Other comprehensive income, before income taxes   9,444 12,183
Federal and state income taxes   2,099 2,865
Other comprehensive income, net of income taxes   7,345 9,318
Balance, end of period   (83,347) (116,570)
Accumulated Other Comprehensive Income (Loss) [Member]      
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, beginning of period   (503,040) (599,100)
Net change in unrealized gain (loss)   173,828 (71,806)
Interest revenue, Investment securities   9,444 12,183
Loss on available-for-sale securities, net   0 45,171
Other comprehensive income, before income taxes   183,272 (14,452)
Federal and state income taxes   42,575 (3,424)
Other comprehensive income, net of income taxes   140,697 (11,028)
Balance, end of period   $ (362,343) $ (610,128)
Subsequent Event [Member] | O2025Q2DividendsMember      
Dividends Payable, Date Declared Apr. 29, 2025    
Dividends declared (in dollars per share) $ 0.57    
Dividends Payable, Date to be Paid May 28, 2025    
Dividends Payable, Date of Record May 15, 2025