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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income before federal income tax $ 159,041 $ 85,257 $ 42,693 $ 15,997 $ 101,293 $ 71,178 $ 90,225 $ 73,694 $ 302,988 $ 336,390 $ 211,721
Income Tax Expense (Benefit)                 56,633 64,767 32,782
Net income $ 127,061 $ 69,875 $ 34,183 $ 15,236 $ 81,859 $ 56,150 $ 72,266 $ 61,348 246,355 271,623 178,939
Unrealized holding gains (losses) during the period, Gross                 168,487 212,683 (123,145)
Unrealized holding gains (losses) during the period, Tax                 35,383 44,662 (25,861)
Unrealized holding gains (losses) arising during period, Net                 133,104 168,021 (97,284)
Unrealized losses on securities with credit loss recognized in earnings; Gross                 (8,176)    
Unrealized losses on securities with credit loss recognized in earnings; Tax                 (1,717)    
Unrealized losses on securities with credit loss recognized in earnings                 (6,459) 0 0
Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Before Tax                 (24) (58) 110
Amounts reclassified into net income: HTM securities, Tax                 (5) (12) 23
Amount reclassified into net income: HTM securities, Net                 (19) (46) 87
Net realized losses (gains) on disposals and losses on intent-to-sell of AFS securities, Gross                 5,376 671 39,641
Net realized losses (gains) on disposals and losses on intent-to-sell of AFS securities, Tax                 1,129 141 8,325
Net realized losses (gains) on disposals and losses on intent-to-sell of AFS securities                 4,247 530 31,316
Credit loss expense, Gross                 5,042    
Credit loss expense, Tax                 1,058    
Credit loss expense, Net                 3,984    
Net unrealized gains (losses), Gross                 170,705 213,296 (83,394)
Net unrealized gains (losses), Tax                 35,848 44,791 (17,513)
Total unrealized gains (losses) on investment securities                 134,857 168,505 (65,881)
Net actuarial gain (loss), Gross                 1,515 (13,795) (11,273)
Net actuarial gain (loss), Tax                 318 (2,897) (2,367)
Net actuarial (loss), Net                 1,197 (10,898) (8,906)
Amount reclassified into net income: Net actuarial loss, Gross                 3,015 2,657 2,127
Amount reclassified into Net Income: Net actuarial loss, Tax                 633 558 447
Amount reclassified into net income: Net actuarial loss, Net                 2,382 2,099 1,680
Defined pension and other post-retirement benefit plans, Gross                 4,530 (11,138) (9,146)
Defined pension and other post-retirement benefit plans, Tax                 951 (2,339) (1,920)
Total defined benefit pension and post-retirement plans                 3,579 (8,799) (7,226)
Other Comprehensive Income (Loss), Gross                 175,235 202,158 (92,540)
Other Comprehensive Income (Loss), Tax                 36,799 42,452 (19,433)
Other comprehensive income (loss)                 138,436 159,706 (73,107)
Comprehensive Income, Before Tax                 478,223 538,548 119,181
Comprehensive Income, Tax                 93,432 107,219 13,349
Comprehensive income                 $ 384,791 $ 431,329 $ 105,832