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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income, Gross $ 458,412 $ 280,186 $ 505,310
Unrealized holding gains (losses) during the period, gross 106,845 (668,107) (151,391)
Unrealized gains (losses) on securities with credit loss recognized in earnings, gross 60,234 (187,968) (9,061)
Amounts reclassified into net income: HTM securities, gross   4 (11)
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, gross 20,458 60,048 (3,825)
Amounts reclassified into net income: Credit loss (benefit) expense, gross (12,898) 39,169 6,858
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax, Total 174,639 (756,854) (157,430)
Defined benefit pension and post-retirement plans: Net actuarial gain (loss), gross (19,385) (20,941) 21,636
Amounts reclassified into net income: net actuarial (gain) loss, gross 3,026 1,668 2,772
Total defined benefit pension and post-retirement benefit plans, gross (16,359) (19,273) 24,408
Other comprehensive income (loss), gross 158,280 (776,127) (133,022)
Comprehensive income (loss), gross 616,692 (495,941) 372,288
Net income, tax 93,174 55,300 101,473
Unrealized holding gains (losses) during the period, tax 22,438 (140,302) (31,793)
Unrealized gains (losses) on securities with credit loss recognized in earnings, tax 12,649 (39,473) (1,902)
Amounts reclassified into net income: HTM securities, tax   1 (2)
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, tax 4,296 12,610 (803)
Amounts reclassified into net income: Credit loss (benefit) expense, tax (2,709) 8,225 1,440
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax, Total 36,674 (158,939) (33,060)
Defined benefit pension and post-retirement plans: Net actuarial gain (loss), tax (4,070) (4,398) 4,543
Amount reclassified into net income: Net actuarial (gain) loss, tax 635 351 582
Total defined benefit pension and post-retirement benefit plans, tax (3,435) (4,047) 5,125
Other comprehensive income (loss), tax 33,239 (162,986) (27,935)
Comprehensive income (loss), tax 126,413 (107,686) 73,538
Net income 365,238 224,886 403,837
Unrealized holding (losses) gains during period, net 84,407 (527,805) (119,598)
Unrealized (gains) losses on securities with credit loss recognized in earnings, net 47,585 (148,495) (7,159)
Amount reclassified into net income: HTM securities, net 0 3 (9)
Amounts reclassified into net income: Net realized (gains) losses on disposals and losses on intent-to-sell available-for-sale securities 16,162 47,438 (3,022)
Amounts reclassified into net income: Credit loss (benefit) expense, net (10,189) 30,944 5,418
Total unrealized gains (losses) on investment securities 137,965 (597,915) (124,370)
Defined benefit pension and post-retirement plans: Net actuarial gain (loss), net (15,315) (16,543) 17,093
Amount reclassified into net income: Net actuarial (gain) loss, net 2,391 1,317 2,190
Total defined benefit pension and post-retirement plans (12,924) (15,226) 19,283
Other comprehensive income (loss) 125,041 (613,141) (105,087)
Comprehensive income (loss) $ 490,279 $ (388,255) $ 298,750