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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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