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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net income, Gross | $ 85,257 | $ 71,178 | $ 143,947 | $ 235,097
Unrealized holding gains during the period, Gross | 37,836 | 34,392 | 132,623 | 220,864
Non-Credit Portion of OTTI Recognized in OCI; Gross | 9,239 |  | (18,672) |
Amounts reclassified into net income: HTM securities, Gross | (1) | (3) | (7) | (33)
Realized (gains) losses on disposals and intent-to-sell OTTI on AFS securities, Gross | (515) | 2,821 | 9,126 | 444
Credit loss (benefit) expense recognized in OTTI, Gross | (2,853) |  | 8,010 |
Total unrealized gains on investment securities, Gross | 43,706 | 37,210 | 131,080 | 221,275
Amount reclassified into net income: Net actuarial loss, Gross | 754 | 665 | 2,261 | 1,993
Total defined benefit pension and post-retirement benefit plans, Gross | 754 | 665 | 2,261 | 1,993
Other comprehensive income, Gross | 44,460 | 37,875 | 133,341 | 223,268
Comprehensive income before tax | 129,717 | 109,053 | 277,288 | 458,365
Net income, Tax | 15,382 | 15,028 | 24,653 | 45,333
Unrealized holding gains during the period, Tax | 7,947 | 7,224 | 27,852 | 46,381
Non-Credit Portion of OTTI Recognized in OCI; Tax | 1,940 |  | (3,921) |
Amounts reclassified into net income: HTM securities, Tax | (1) | (1) | (2) | (7)
Realized (gains) losses on disposals and intent-to-sell OTTI on AFS securities, Tax | (109) | 592 | 1,916 | 93
Credit loss (benefit) expense recognized in OTTI, Tax | (599) |  | 1,682 |
Total unrealized gains on investment securities, Tax | 9,178 | 7,815 | 27,527 | 46,467
Amount reclassified into net income: Net actuarial loss, Tax | 158 | 140 | 474 | 419
Total defined benefit pension and post-retirement benefit plans, Tax | 158 | 140 | 474 | 419
Other comprehensive income, Tax | 9,336 | 7,955 | 28,001 | 46,886
Comprehensive income, Tax | 24,718 | 22,983 | 52,654 | 92,219
Net income | 69,875 | 56,150 | 119,294 | 189,764
Unrealized holding gains arising during period, Net | 29,889 | 27,168 | 104,771 | 174,483
Non-Credit Portion of OTTI Recognized in OCI, Net | 7,299 | 0 | (14,751) | 0
Amounts reclassified into net income: HTM Securities, Net | 0 | (2) | (5) | (26)
Realized (gains) losses on disposals and intent-to-sell OTTI on AFS Securities, Net | (406) | 2,229 | 7,210 | 351
Credit loss (benefit) expense recognized in OTTI, Net | (2,254) | 0 | 6,328 | 0
Total Unrealized Gains Losses on Investment Securities, Net | 34,528 | 29,395 | 103,553 | 174,808
Amount reclassified into net income: Net actuarial loss, Net | 596 | 525 | 1,787 | 1,574
Total defined benefit pension and post-retirement plans, Net | 596 | 525 | 1,787 | 1,574
Other Comprehensive Income, Net | 35,124 | 29,920 | 105,340 | 176,382
Comprehensive Income, Net | $ 104,999 | $ 86,070 | $ 224,634 | $ 366,146

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