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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net income, Gross $ 112,517 $ 52,639 $ 301,433 $ 172,433
Unrealized holding gains (losses) during the period, Gross (101,722) (189,622) (96,478) (674,357)
Unrealized gains (losses) on securities with credit loss recognized in earnings, Gross (32,898) (68,287) (16,497) (227,599)
Amounts reclassified into net income: HTM securities, Gross   1   2
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, Gross 4,628 14,235 20,115 48,396
Amounts reclassified into net income: Credit loss (benefit) expense, Gross 2,468 4,471 (7,925) 42,042
Total unrealized gains (losses) on investment securities, Gross (127,524) (239,202) (100,785) (811,516)
Amount reclassified into net income: Net actuarial (gain) loss, Gross 756 417 2,270 1,251
Total defined benefit pension and post-retirement plans, Gross 756 417 2,270 1,251
Other comprehensive income (loss), Gross (126,768) (238,785) (98,515) (810,265)
Comprehensive income (loss), Gross (14,251) (186,146) 202,918 (637,832)
Net income, Tax 23,309 10,114 61,043 34,058
Unrealized holding gains (losses) during the period, Tax (21,361) (39,819) (20,259) (141,613)
Unrealized gains (losses) on securities with credit loss recognized in earnings, Tax (6,909) (14,341) (3,465) (47,796)
Amounts reclassified into net income: HTM securities, Tax   0   0
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, Tax 972 2,989 4,224 10,163
Amounts reclassified into net income: Credit loss (benefit) expense, Tax 519 939 (1,664) 8,828
Total unrealized gains (losses) on investment securities, Tax (26,779) (50,232) (21,164) (170,418)
Amount reclassified into net income: Net actuarial (gain) loss, Tax 158 88 476 263
Total defined benefit pension and post-retirement plans, Tax 158 88 476 263
Other comprehensive income (loss), Tax (26,621) (50,144) (20,688) (170,155)
Comprehensive income (loss), Tax (3,312) (40,030) 40,355 (136,097)
Net income 89,208 42,525 240,390 138,375
Unrealized holding gains (losses) during the period, Net (80,361) (149,803) (76,219) (532,744)
Unrealized gains (losses) on securities with credit loss recognized in earnings, Net (25,989) (53,946) (13,032) (179,803)
Amounts reclassified into net income: HTM securities, Net 0 1 0 2
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, Net 3,656 11,246 15,891 38,233
Amounts reclassified into net income: Credit loss (benefit) expense, Net 1,949 3,532 (6,261) 33,214
Total unrealized gains (losses) on investment securities (100,745) (188,970) (79,621) (641,098)
Amount reclassified into net income: Net actuarial (gain) loss, Net 598 329 1,794 988
Total defined benefit pension and post-retirement plans, Net 598 329 1,794 988
Other comprehensive income (loss) (100,147) (188,641) (77,827) (640,110)
Comprehensive income (loss) $ (10,939) $ (146,116) $ 162,563 $ (501,735)