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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income, Before-tax Amount | $ 131,363 | $ 186,985 | $ 297,536 | $ 558,383
Net income, Tax Effect | (39,789) | (51,259) | (74,250) | (146,287)
Net income | 91,574 | 135,726 | 223,286 | 412,096
Net unrealized gains (losses) on investment securities available for sale: Before-tax Amount |  |  |  |
Net unrealized holding gains (losses) arising during the period, Before-tax Amount | (29,428) | 33,919 | 116,975 | 226,160
Reclassification adjustment for net losses realized in net income, Before-tax Amount | 1,550 | 3,731 | (76,594) | 5,502
Net unrealized gains (losses), Before-tax Amount | (27,878) | 37,650 | 40,381 | 231,662
Net unrealized gains (losses) on investment securities available for sale: Tax Effect |  |  |  |
Net unrealized holding gains (losses) arising during the period, Tax Effect | 7,622 | (8,786) | (30,297) | (58,574)
Reclassification adjustment for net losses realized in net income, Tax Effect | (401) | (966) | 19,838 | (1,425)
Net unrealized gains (losses), Tax Effect | 7,221 | (9,752) | (10,459) | (59,999)
Net unrealized gains (losses) on investment securities available for sale: Net of Tax Amount |  |  |  |
Net unrealized holding gains (losses) arising during the period, Net of Tax Amount | (21,806) | 25,133 | 86,678 | 167,586
Reclassification adjustment for net losses realized in net income, Net of Tax Amount | 1,149 | 2,765 | (56,756) | 4,077
Net unrealized gains (losses), Net of Tax Amount | (20,657) | 27,898 | 29,922 | 171,663
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Before-tax Amount |  |  |  |
Net unrealized gains (losses) arising during the period, Before-tax Amount | (8,954) | (1,182) | 108,508 | (1,182)
Reclassification adjustment for realized (gains) losses included in net income, Before-tax Amount | (1,031) | 0 | (1,421) | 0
Net change, Before-tax Amount | (9,985) | (1,182) | 107,087 | (1,182)
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Tax Effect |  |  |  |
Net unrealized gains (losses) arising during the period, Income Tax | 2,319 | 306 | (28,104) | 306
Reclassification adjustment for realized (gains) losses included in net income, Income Tax | 267 | 0 | 368 | 0
Net change, Income Tax | 2,586 | 306 | (27,736) | 306
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Net of Tax Amount |  |  |  |
Net unrealized gains (losses) arising during the period, Net of Tax Amount | (6,635) | (876) | 80,404 | (876)
Reclassification adjustment for realized (gains) losses included in net income, Net of Tax Amount | (764) | 0 | (1,053) | 0
Net change, Net of Tax Amount | (7,399) | (876) | 79,351 | (876)
Post-retirement unfunded health benefit: Before-tax Amount |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 0 | (510) | 0 | (510)
Reclassification adjustment for realized (gains) losses included in net income, Before-tax Amount | 0 | 0 | 0 | (70)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | 0 | (510) | 0 | (580)
Post-retirement unfunded health benefit: Tax Effect |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | 0 | (132) | 0 | (132)
Reclassification adjustment for realized (gains) losses included in net income, Tax Effect | 0 | 0 | 0 | 14
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 0 | 132 | 0 | 146
Post-retirement unfunded health benefit: Net of Tax Amount |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax | 0 | (378) | 0 | (378)
Reclassification adjustment for realized (gains) losses included in net income, Net of Tax Amount | 0 | 0 | 0 | (56)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 | (378) | 0 | (434)
Other comprehensive income (loss), Before-tax Amount | (37,863) | 35,958 | 147,468 | 229,900
Other comprehensive income (loss), Tax Effect | 9,807 | (9,314) | (38,195) | (59,547)
Other comprehensive income (loss), net of income taxes | (28,056) | 26,644 | 109,273 | 170,353
Comprehensive income, Net of Tax Amount | $ 63,518 | $ 162,370 | $ 332,559 | $ 582,449

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