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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
May 02, 2023
Mar. 31, 2023
Mar. 31, 2022
Dividends declared (in dollars per share)   $ 0.54 $ 0.53
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, Beginning of Period   $ (836,955) $ 72,371
Net change in unrealized gain (loss)   124,045 (639,041)
Gain on available for sale securities, net   0 (937)
Interest revenue, Investment securities   16,051 0
Other comprehensive income, before income taxes   140,096 (639,978)
Federal and state income taxes   31,695 (149,781)
Other comprehensive income, net of income taxes   108,401 (490,197)
Balance, End of Period   (728,554) (417,826)
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]      
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, Beginning of Period   (664,618) 69,775
Net change in unrealized gain (loss)   124,045 (639,041)
Gain on available for sale securities, net     (937)
Interest revenue, Investment securities   0  
Other comprehensive income, before income taxes   124,045 (639,978)
Federal and state income taxes   28,179 (149,781)
Other comprehensive income, net of income taxes   95,866 (490,197)
Balance, End of Period   (568,752) (420,422)
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   (172,337) 0
Net change in unrealized gain (loss)   0 0
Gain on available for sale securities, net     0
Interest revenue, Investment securities   16,051  
Other comprehensive income, before income taxes   16,051 0
Federal and state income taxes   3,516 0
Other comprehensive income, net of income taxes   12,535 0
Balance, End of Period   (159,802) 0
Accumulated Unrealized Gain (Loss) on Employee Benefit Plans [Member]      
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, Beginning of Period   0 2,596
Net change in unrealized gain (loss)   0 0
Gain on available for sale securities, net     0
Interest revenue, Investment securities   0  
Other comprehensive income, before income taxes   0 0
Federal and state income taxes   0 0
Other comprehensive income, net of income taxes   0 0
Balance, End of Period   $ 0 $ 2,596
Subsequent Event [Member]      
Dividends Payable, Date Declared May 02, 2023    
Dividends declared (in dollars per share) $ 0.54    
Dividends Payable, Date to be Paid May 30, 2023    
Dividends Payable, Date of Record May 15, 2023