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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 107,786 | $ (96,147) | $ 464,072 | $ (286,935)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (305) | (3,764) | (957) | (8,424)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | (97) | 34 | (266) | 113
Total securities available for sale and transferred securities, before tax amount | 107,384 | (99,877) | 462,849 | (295,246)
Change in the net actuarial gain/loss,Before Tax Amount | 0 | 0 | 0 | 0
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount | 1,406 | 1,250 | 4,218 | 3,751
Total defined-benefit post-retirement benefit plans | 1,406 | 1,250 | 4,218 | 3,751
Total other comprehensive income (loss), before tax | 108,790 | (98,627) | 467,067 | (291,495)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 22,635 | (20,190) | 97,455 | (60,256)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (64) | (790) | (201) | (1,769)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | (21) | 7 | (56) | 24
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 22,550 | (20,973) | 97,198 | (62,001)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), Tax Expense (Benefit) | 295 | 262 | 886 | 788
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 295 | 262 | 886 | 788
Total other comprehensive income (loss), Tax Expense (Benefit) | 22,845 | (20,711) | 98,084 | (61,213)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 85,151 | (75,957) | 366,617 | (226,679)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (241) | (2,974) | (756) | (6,655)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | (76) | 27 | (210) | 89
Total securities available for sale and transferred securities, Net of Tax | 84,834 | (78,904) | 365,651 | (233,245)
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax | 1,111 | 988 | 3,332 | 2,963
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 1,111 | 988 | 3,332 | 2,963
Other comprehensive income (loss), net of tax | $ 85,945 | $ (77,916) | $ 368,983 | $ (230,282)

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