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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income, Gross $ 280,186 $ 505,310 $ 302,988
Unrealized holding (losses) gains during the period, Gross (668,107) (151,391) 168,487
Unrealized losses on securities with credit loss recognized in earnings, gross (187,968) 9,061 (8,176)
Amounts reclassified into net income: HTM securities, gross 4 (11) (24)
Amounts reclassified into net income: net realized losses (gains) on disposals and intent-to-sell AFS securities, gross 60,048 (3,825) 5,376
Amounts reclassified into net income: Credit loss expense, gross 39,169 6,858 5,042
Total unrealized losses (gains) on investment securities, gross 756,854 157,430 (170,705)
Defined benefit pension and post-retirement plans: Net actuarial loss (gain), gross (20,941) 21,636 1,515
Amounts reclassified into net income: net actuarial loss, gross 1,668 2,772 3,015
Total defined benefit pension and post-retirement benefit plans, gross (19,273) 24,408 4,530
Other comprehensive income (loss), gross (776,127) (133,022) 175,235
Comprehensive income (loss), gross (495,941) 372,288 478,223
Net income, tax 55,300 101,473 56,633
Unrealized holding (losses) gains during the period, tax (140,302) (31,793) 35,383
Unrealized losses on securities with credit loss recognized in earnings, tax (39,473) (1,902) (1,717)
Amounts reclassified into net income: HTM securities, tax 1 (2) (5)
Amounts reclassified into net income: net realized losses (gains) on disposals and intent-to-sell AFS securities, tax 12,610 (803) 1,129
Amounts reclassified into net income: Credit loss expense, tax 8,225 1,440 1,058
Total unrealized (losses) gains on investment securities, tax (158,939) (33,060) 35,848
Defined benefit pension and post-retirement plans: Net actuarial (loss) gain, tax (4,398) 4,543 318
Amount reclassified into net income: Net actuarial loss, tax 351 582 633
Total defined benefit pension and post-retirement benefit plans, tax (4,047) 5,125 951
Other comprehensive (loss) income, tax (162,986) (27,935) 36,799
Comprehensive (loss) income, tax (107,686) 73,538 93,432
Net income 224,886 403,837 246,355
Unrealized holding (losses) gains during period, net 527,805 119,598 133,104
Unrealized losses on securities with credit loss recognized in earnings (148,495) (7,159) (6,459)
Amount reclassified into net income: HTM securities, net 3 (9) (19)
Amounts reclassified into net income: Net realized losses (gains) on disposals and losses on intent-to-sell available-for-sale securities 47,438 (3,022) 4,247
Amounts reclassified into net income: Credit loss expense, net 30,944 5,418 3,984
Total unrealized (losses) gains on investment securities (597,915) (124,370) (134,857)
Defined benefit pension and post-retirement plans: Net actuarial (loss) gain, net (16,543) 17,093 1,197
Amount reclassified into net income: Net actuarial loss, net 1,317 2,190 2,382
Total defined benefit pension and post-retirement plans, net (15,226) 19,283 3,579
Other comprehensive (loss) income (613,141) (105,087) 138,436
Comprehensive (loss) income $ (388,255) $ 298,750 $ 384,791