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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income before federal income tax $ 505,310 $ 302,988 $ 336,390
Income Tax Expense (Benefit) 101,473 56,633 64,767
Net income 403,837 246,355 271,623
Unrealized holding (losses) gains during the period, Gross 151,391 168,487 212,683
Unrealized holding (losses) gains during the period, Tax 31,793 35,383 44,662
Unrealized holding (losses) gains arising during period, Net 119,598 133,104 168,021
Unrealized losses on securities with credit loss recognized in earnings; Gross (9,061) (8,176)  
Unrealized losses on securities with credit loss recognized in earnings; Tax (1,902) (1,717)  
Unrealized losses on securities with credit loss recognized in earnings (7,159) (6,459) 0
Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Before Tax (11) (24) (58)
Amounts reclassified into net income: HTM securities, Tax (2) (5) (12)
Amount reclassified into net income: HTM securities, Net (9) (19) (46)
Net realized losses (gains) on disposals and losses on intent-to-sell of AFS securities, Gross (3,825) 5,376 671
Net realized losses (gains) on disposals and losses on intent-to-sell of AFS securities, Tax (803) 1,129 141
Net realized losses (gains) on disposals and losses on intent-to-sell of AFS securities (3,022) 4,247 530
Credit loss expense, Gross 6,858 5,042  
Credit loss expense, Tax 1,440 1,058  
Credit loss expense, Net 5,418 3,984  
Net unrealized gains (losses), Gross (157,430) 170,705 213,296
Net unrealized gains (losses), Tax (33,060) 35,848 44,791
Total unrealized (losses) gains on investment securities 124,370 134,857 168,505
Net actuarial gain (loss), Gross 21,636 1,515 (13,795)
Net actuarial gain (loss), Tax 4,543 318 (2,897)
Net actuarial (loss), Net (17,093) 1,197 10,898
Amount reclassified into net income: Net actuarial loss, Gross 2,772 3,015 2,657
Amount reclassified into Net Income: Net actuarial loss, Tax 582 633 558
Amount reclassified into net income: Net actuarial loss, Net 2,190 2,382 2,099
Defined pension and other post-retirement benefit plans, Gross 24,408 4,530 (11,138)
Defined pension and other post-retirement benefit plans, Tax 5,125 951 (2,339)
Total defined benefit pension and post-retirement plans 19,283 3,579 (8,799)
Other Comprehensive Income (Loss), Gross (133,022) 175,235 202,158
Other Comprehensive Income (Loss), Tax (27,935) 36,799 42,452
Other comprehensive (loss) income (105,087) 138,436 159,706
Comprehensive Income, Before Tax 372,288 478,223 538,548
Comprehensive Income, Tax 73,538 93,432 107,219
Comprehensive income $ 298,750 $ 384,791 $ 431,329