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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 156,509 | $ 158,140 | $ 386,627 | $ 356,286
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (308) | (308) | (685) | (652)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | (169) | (108,989) | (169)
Total securities available for sale and transferred securities, before tax amount | 156,201 | 157,663 | 276,953 | 355,465
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount | 1,329 | 1,406 | 2,659 | 2,812
Total defined-benefit post-retirement benefit plans | 1,329 | 1,406 | 2,659 | 2,812
Total other comprehensive income (loss), before tax | 157,530 | 159,069 | 279,612 | 358,277
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 32,868 | 33,209 | 81,193 | 74,820
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (65) | (65) | (144) | (137)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | (35) | (22,888) | (35)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 32,803 | 33,109 | 58,161 | 74,648
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), Tax Expense (Benefit) | 278 | 296 | 557 | 591
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 278 | 296 | 557 | 591
Total other comprehensive income (loss), Tax Expense (Benefit) | 33,081 | 33,405 | 58,718 | 75,239
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 123,641 | 124,931 | 305,434 | 281,466
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (243) | (243) | (541) | (515)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 0 | (134) | (86,101) | (134)
Total securities available for sale and transferred securities, Net of Tax | 123,398 | 124,554 | 218,792 | 280,817
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax | 1,051 | 1,110 | 2,102 | 2,221
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 1,051 | 1,110 | 2,102 | 2,221
Other comprehensive income (loss), net of tax | $ 124,449 | $ 125,664 | $ 220,894 | $ 283,038

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