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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net income, Gross $ 153,198 $ 42,693 $ 288,830 $ 58,690
Unrealized holding gains (losses) during the period, Gross 35,553 188,768 (67,755) 94,787
Unrealized gains (losses) on securities with credit loss recognized in earnings; Gross 9,985 37,479 (1,335) (27,911)
Amounts reclassified into net income: HTM securities, Gross (3) (31) (5) (6)
Amounts reclassified into net income: Net realized losses (gains) on disposals and losses on intent-to-sell AFS securities, Gross 58 (1,686) 662 9,641
Amounts reclassified into net income: Credit loss (benefit) expense, Gross (2,272) (4,924) 2,725 10,863
Total unrealized gains (losses) on investment securities, Gross 43,321 219,606 (65,708) 87,374
Amount reclassified into net income: Net actuarial loss, Gross 693 753 1,386 1,507
Total defined benefit pension and post-retirement benefit plans, Gross 693 753 1,386 1,507
Other comprehensive income (loss), Gross 44,014 220,359 (64,322) 88,881
Comprehensive income before tax 197,212 263,052 224,508 147,571
Net income, Tax 31,315 8,510 57,677 9,271
Unrealized holding gains (losses) during the period, Tax 7,467 39,641 (14,228) 19,905
Unrealized gains (losses) on securities with credit loss recognized in earnings; Tax 2,097 7,871 (280) (5,861)
Amounts reclassified into net income: HTM securities, Tax (1) (6) (1) (1)
Amounts reclassified into net income: Net realized losses (gains) on disposals and losses on intent-to-sell AFS securities, Tax 12 (354) 139 2,025
Amounts reclassified into net income: Credit loss (benefit) expense, Tax (477) (1,034) 572 2,281
Total unrealized losses (gains) on investment securities, Tax 9,098 46,118 (13,798) 18,349
Amount reclassified into net income: Net actuarial loss, Tax 145 158 291 316
Total defined benefit pension and post-retirement benefit plans, Tax 145 158 291 316
Other comprehensive income (loss), Tax 9,243 46,276 (13,507) 18,665
Comprehensive income, Tax 40,558 54,786 44,170 27,936
Net income 121,883 34,183 231,153 49,419
Unrealized holding gains (losses) arising during period, Net 28,086 149,127 (53,527) 74,882
Unrealized gains (losses) on securities with credit loss recognized in earnings, Net 7,888 29,608 (1,055) (22,050)
Amounts reclassified into net income: HTM Securities, Net (2) (25) (4) (5)
Amounts reclassified into net income: Net realized losses (gains) on disposals and losses on intent-to-sell AFS Securities, Net 46 (1,332) 523 7,616
Amounts reclassified into net income: Credit loss (benefit) expense, Net (1,795) (3,890) 2,153 8,582
Total Unrealized Gains (Losses) on Investment Securities, Net 34,223 173,488 (51,910) 69,025
Amount reclassified into net income: Net actuarial loss, Net 548 595 1,095 1,191
Total defined benefit pension and post-retirement plans, Net 548 595 1,095 1,191
Other Comprehensive income (loss) 34,771 174,083 (50,815) 70,216
Comprehensive Income $ 156,654 $ 208,266 $ 180,338 $ 119,635