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Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income, Net of Tax) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | $ 267,370 |  |
Net other comprehensive income (loss) during period | 245,600 | $ 330,970 | $ (152,647)
Ending Balance | 512,970 | 267,370 |
Securities Available For Sale [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 313,304 | (16,103) | 117,230
Other comprehensive income (loss) before reclassification | 336,598 | 329,638 | (151,013)
Reclassification of amounts included in net income | (86,101) | (231) | 123
Net other comprehensive income (loss) during period | 250,497 | 329,407 | (150,890)
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act |  |  | 17,557
Ending Balance | 563,801 | 313,304 | (16,103)
Defined Benefit Plans [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (45,934) | (47,497) | (37,718)
Other comprehensive income (loss) before reclassification | (9,099) | (2,879) | (5,708)
Reclassification of amounts included in net income | 4,202 | 4,442 | 3,951
Net other comprehensive income (loss) during period | (4,897) | 1,563 | (1,757)
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act |  |  | (8,022)
Ending Balance | (50,831) | (45,934) | (47,497)
AOCI Attributable to Parent [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 267,370 | (63,600) | 79,512
Other comprehensive income (loss) before reclassification | 327,499 | 326,759 | (156,721)
Reclassification of amounts included in net income | (81,899) | 4,211 | 4,074
Net other comprehensive income (loss) during period | 245,600 | 330,970 | (152,647)
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act |  |  | 9,535
Ending Balance | $ 512,970 | $ 267,370 | $ (63,600)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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