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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, before tax amount | $ 418,556 | $ (182,340) | $ 157,016
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, before tax amount | (1,292) | (8,818) | (16,193)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, before tax amount | (293) | 156 | 4,941
Total securities available for sale and transferred securities before tax amount | 416,971 | (191,002) | 145,764
Change in the net actuarial gain/loss before tax amount | (3,644) | (7,225) | (597)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) before tax amount | 5,623 | 5,002 | 5,429
Total defined-benefit post-retirement benefit plans | 1,979 | (2,223) | 4,832
Other comprehensive income (loss), before tax | 418,950 | (193,225) | 150,596
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, tax expense (benefit) | 87,897 | (38,292) | 48,626
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit | (271) | (1,853) | (5,668)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, tax expense (benefit) | (62) | 33 | 1,729
Total securities available for sale and transferred securities, tax expense (benefit) | 87,564 | (40,112) | 44,687
Change in the net actuarial gain/loss, tax expense (benefit) | (765) | (1,517) | (126)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit) , tax expense (benefit) | 1,181 | 1,051 | 1,900
Total defined-benefit post-retirement benefit plans, tax expense (benefit) | 416 | (466) | 1,774
Total other comprehensive income, tax expense (benefit) | 87,980 | (40,578) | 46,461
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax amount | 330,659 | (144,048) | 108,390
Securities available for sale and transferred securities. change in net unrealized gain on securities transfers to held-to-maturity, net of tax amount | (1,021) | (6,965) | (10,525)
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax amount | (231) | 123 | 3,212
Total securities available for sale and transferred securities, net of tax amount | 329,407 | (150,890) | 101,077
Change in the net actuarial gain/loss, net of tax amount | (2,879) | (5,708) | (471)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit), net of tax amount | 4,442 | 3,951 | 3,529
Total defined-benefit post-retirement benefit plans, net of tax amount | 1,563 | (1,757) | 3,058
Other comprehensive income (loss), net of tax | $ 330,970 | $ (152,647) | $ 104,135

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Name: | us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration