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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

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