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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income, Before-tax Amount | $ 124,058 | $ 210,824 | $ 166,173 | $ 371,398
Net income, Tax Effect | (30,866) | (54,640) | (34,461) | (95,028)
Net income | 93,192 | 156,184 | 131,712 | 276,370
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 | (11,939) | 89,459 | 146,403 | 192,241
Reclassification adjustment for net losses realized in net income, Before-tax Amount | (69,409) | 1,845 | (78,144) | 1,771
Net unrealized gains (losses), Before-tax Amount | (81,348) | 91,304 | 68,259 | 194,012
Net unrealized gains (losses) on investment securities available for sale: Tax Effect |  |  |  |
Net unrealized holding gains (losses) arising during the period, Tax Effect | 3,092 | (23,169) | (37,919) | (49,788)
Reclassification adjustment for net losses realized in net income, Tax Effect | 17,977 | (478) | 20,239 | (459)
Net unrealized gains (losses), Tax Effect | 21,069 | (23,647) | (17,680) | (50,247)
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 | (8,847) | 66,290 | 108,484 | 142,453
Reclassification adjustment for net losses realized in net income, Net of Tax Amount | (51,432) | 1,367 | (57,905) | 1,312
Net unrealized gains (losses), Net of Tax Amount | (60,279) | 67,657 | 50,579 | 143,765
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 | 8,823 | 0 | 117,462 | 0
Reclassification adjustment for realized (gains) losses included in net income, Before-tax Amount | (270) | 0 | (390) | 0
Net change, Before-tax Amount | 8,553 | 0 | 117,072 | 0
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Tax Effect |  |  |  |
Net unrealized gains (losses) arising during the period, Income Tax | (2,285) | 0 | (30,423) | 0
Reclassification adjustment for realized (gains) losses included in net income, Income Tax | 70 | 0 | 101 | 0
Net change, Income Tax | (2,215) | 0 | (30,322) | 0
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 | 6,538 | 0 | 87,039 | 0
Reclassification adjustment for realized (gains) losses included in net income, Net of Tax Amount | (200) | 0 | (289) | 0
Net change, Net of Tax Amount | 6,338 | 0 | 86,750 | 0
Post-retirement unfunded health benefit: Before-tax Amount |  |  |  |
Reclassification adjustment for realized (gains) losses included in net income, Before-tax Amount | 0 | (35) | 0 | (70)
Post-retirement unfunded health benefit: Tax Effect |  |  |  |
Reclassification adjustment for realized (gains) losses included in net income, Tax Effect | 0 | 9 | 0 | 14
Post-retirement unfunded health benefit: Net of Tax Amount |  |  |  |
Reclassification adjustment for realized (gains) losses included in net income, Net of Tax Amount | 0 | (26) | 0 | (56)
Other comprehensive income (loss), Before-tax Amount | (72,795) | 91,269 | 185,331 | 193,942
Other comprehensive income (loss), Tax Effect | 18,854 | (23,638) | (48,002) | (50,233)
Other comprehensive income (loss), Net of Tax Amount | (53,941) | 67,631 | 137,329 | 143,709
Comprehensive income, Net of Tax Amount | $ 39,251 | $ 223,815 | $ 269,041 | $ 420,079

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