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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income, Gross $ 92,636 $ 85,257 $ 381,466 $ 143,947
Unrealized holding gains (losses) during the period, Gross (35,285) 37,836 (103,040) 132,623
Unrealized gains (losses) on securities with credit loss recognized in earnings; Gross (2,343) 9,239 (3,678) (18,672)
Amounts reclassified into net income: HTM securities, Gross 1 (1) (4) (7)
Amounts reclassified into net income: Net realized losses (gains) on disposals and losses on intent-to-sell AFS securities, Gross (1,296) (515) (634) 9,126
Amounts reclassified into net income: Credit loss (benefit) expense, Gross 1,334 (2,853) 4,059 8,010
Total unrealized gains (losses) on investment securities, Gross (37,589) 43,706 (103,297) 131,080
Amount reclassified into net income: Net actuarial loss, Gross 693 754 2,079 2,261
Total defined benefit pension and post-retirement benefit plans, Gross 693 754 2,079 2,261
Other comprehensive income (loss), Gross (36,896) 44,460 (101,218) 133,341
Comprehensive income before tax 55,740 129,717 280,248 277,288
Net income, Tax 18,931 15,382 76,608 24,653
Unrealized holding gains (losses) during the period, Tax (7,410) 7,947 (21,638) 27,852
Unrealized gains (losses) on securities with credit loss recognized in earnings; Tax (492) 1,940 (772) (3,921)
Amounts reclassified into net income: HTM securities, Tax 0 (1) (1) (2)
Amounts reclassified into net income: Net realized losses (gains) on disposals and losses on intent-to-sell AFS securities, Tax (272) (109) (133) 1,916
Amounts reclassified into net income: Credit loss (benefit) expense, Tax 280 (599) 852 1,682
Total unrealized losses (gains) on investment securities, Tax (7,894) 9,178 (21,692) 27,527
Amount reclassified into net income: Net actuarial loss, Tax 145 158 436 474
Total defined benefit pension and post-retirement benefit plans, Tax 145 158 436 474
Other comprehensive income (loss), Tax (7,749) 9,336 (21,256) 28,001
Comprehensive income, Tax 11,182 24,718 55,352 52,654
Net income 73,705 69,875 304,858 119,294
Unrealized holding gains (losses) arising during period, Net (27,875) 29,889 (81,402) 104,771
Unrealized (losses) gains on securities with credit loss recognized in earnings, Net (1,851) 7,299 (2,906) (14,751)
Amounts reclassified into net income: HTM Securities, Net 1 0 (3) (5)
Amounts reclassified into net income: Net realized (gains) losses on disposals and losses on intent-to-sell AFS Securities, Net (1,024) (406) (501) 7,210
Amounts reclassified into net income: Credit loss (benefit) expense, Net 1,054 (2,254) 3,207 6,328
Total Unrealized (Losses) Gains on Investment Securities, Net (29,695) 34,528 (81,605) 103,553
Amount reclassified into net income: Net actuarial loss, Net 548 596 1,643 1,787
Total defined benefit pension and post-retirement plans, Net 548 596 1,643 1,787
Other Comprehensive (loss) income (29,147) 35,124 (79,962) 105,340
Comprehensive Income $ 44,558 $ 104,999 $ 224,896 $ 224,634