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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 30,668 | $ 156,509 | $ (129,111) | $ 386,627
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (245) | (308) | (504) | (685)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | 0 | 0 | (108,989)
Total securities available for sale and transferred securities, before tax amount | 30,423 | 156,201 | (129,615) | 276,953
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount | 1,529 | 1,329 | 3,058 | 2,659
Total defined-benefit post-retirement benefit plans | 1,529 | 1,329 | 3,058 | 2,659
Total other comprehensive income (loss), before tax | 31,952 | 157,530 | (126,557) | 279,612
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 6,441 | 32,868 | (27,113) | 81,193
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (52) | (65) | (106) | (144)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) |  |  | 0 | (22,888)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 6,389 | 32,803 | (27,219) | 58,161
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), Tax Expense (Benefit) | 321 | 278 | 642 | 557
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 321 | 278 | 642 | 557
Total other comprehensive income (loss), Tax Expense (Benefit) | 6,710 | 33,081 | (26,577) | 58,718
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 24,227 | 123,641 | (101,998) | 305,434
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (193) | (243) | (398) | (541)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax |  |  | 0 | (86,101)
Total securities available for sale and transferred securities, Net of Tax | 24,034 | 123,398 | (102,396) | 218,792
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income as a component of net periodic cost (benefit), Net of Tax | 1,208 | 1,051 | 2,416 | 2,102
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 1,208 | 1,051 | 2,416 | 2,102
Other comprehensive income (loss), net of tax | $ 25,242 | $ 124,449 | $ (99,980) | $ 220,894

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