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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 29, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dividends declared (in dollars per share)   $ 0.55 $ 0.54 $ 1.65 $ 1.62
Schedule of Accumulated Other Income (Loss) [Abstract]          
Balance, Beginning of Period       $ (599,100) $ (836,955)
Net change in unrealized gain (loss)   $ 341,185 $ (135,614) 263,436 (171,977)
Interest revenue, Investment securities   11,431 14,912 35,641 46,996
Loss on available-for-sale securities, net   691 0 45,828 3,010
Other comprehensive income, before income taxes   353,307 (120,702) 344,905 (121,971)
Federal and state income taxes   83,094 (28,389) 81,094 (29,941)
Other comprehensive income, net of income taxes   270,213 (92,313) 263,811 (92,030)
Balance, End of Period   (335,289) (928,985) (335,289) (928,985)
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]          
Schedule of Accumulated Other Income (Loss) [Abstract]          
Balance, Beginning of Period       (473,212) (664,618)
Net change in unrealized gain (loss)       263,436 (171,977)
Interest revenue, Investment securities       0 0
Loss on available-for-sale securities, net       45,828 3,010
Other comprehensive income, before income taxes       309,264 (168,967)
Federal and state income taxes       72,711 (40,735)
Other comprehensive income, net of income taxes       236,553 (128,232)
Balance, End of Period   (236,659) (792,850) (236,659) (792,850)
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       (125,888) (172,337)
Net change in unrealized gain (loss)       0 0
Interest revenue, Investment securities       35,641 46,996
Loss on available-for-sale securities, net       0 0
Other comprehensive income, before income taxes       35,641 46,996
Federal and state income taxes       8,383 10,794
Other comprehensive income, net of income taxes       27,258 36,202
Balance, End of Period   $ (98,630) $ (136,135) $ (98,630) $ (136,135)
Subsequent Event [Member]          
Dividends declared (in dollars per share) $ 0.57        
Subsequent Event [Member] | Dividend Declared          
Dividends Payable, Date Declared Oct. 29, 2024        
Dividends Payable, Date to be Paid Nov. 27, 2024        
Dividends Payable, Date of Record Nov. 15, 2024