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Shareholders' Equity and Other Comprehensive Income - OCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance $ 5,296,800 $ 5,161,334 $ 4,941,690
Other comprehensive income (loss) before reclassifications (1,377,998) (231,951) 153,993
Amounts reclassified from accumulated other comprehensive income (loss) 18,202 (9,005) (60,999)
Other comprehensive income (loss) (1,359,796) (240,956) 92,994
Ending balance 4,475,801 5,296,800 5,161,334
Accumulated other comprehensive income (loss), net (1,442,117) (82,321)  
Net Unrealized Gains (Losses) on Investment Securities Available for Sale      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (67,980) 105,669 83,666
Other comprehensive income (loss) before reclassifications (1,152,283) (174,246) 80,491
Amounts reclassified from accumulated other comprehensive income (loss) 0 597 (58,488)
Other comprehensive income (loss) (1,152,283) (173,649) 22,003
Ending balance (1,220,263) (67,980) 105,669
Accumulated other comprehensive income (loss), net 13,300    
Net Unrealized Gains (Losses) on Cash Flow Hedges      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (14,341) 52,966 (18,487)
Other comprehensive income (loss) before reclassifications (225,715) (57,705) 73,502
Amounts reclassified from accumulated other comprehensive income (loss) 18,202 (9,602) (2,049)
Other comprehensive income (loss) (207,513) (67,307) 71,453
Ending balance (221,854) (14,341) 52,966
Accumulated other comprehensive income (loss), net 12,100    
Post-Retirement Unfunded Health Benefit      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance 0 0 462
Other comprehensive income (loss) before reclassifications 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 (462)
Other comprehensive income (loss) 0 0 (462)
Ending balance 0 0 0
AOCI      
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]      
Beginning balance (82,321) 158,635 65,641
Other comprehensive income (loss) (1,359,796) (240,956) 92,994
Ending balance $ (1,442,117) $ (82,321) $ 158,635