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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 165,288 | $ (113,268) | $ 287,506 | $ (78,741)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (9,185) | (8,207) | (17,351) | (16,094)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | 0 | (14,903) | (228)
Total securities available for sale and transferred securities, before tax amount | 156,103 | (121,475) | 255,252 | (95,063)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 1,553 | 1,749 | 3,106 | 3,498
Remeasurement of projected benefit obligation related to SERP | (862) | 0 | (862) | 0
Reclassification adjustment for SERP settlement costs included in net income, before tax amount | 187 | 0 | 187 | 0
Total defined-benefit post-retirement benefit plans | 878 | 1,749 | 2,431 | 3,498
Total other comprehensive income (loss), before tax | 156,981 | (119,726) | 257,683 | (91,565)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 57,851 | (39,643) | 100,627 | (27,559)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (3,215) | (2,873) | (6,073) | (5,633)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | 0 | (5,216) | (80)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 54,636 | (42,516) | 89,338 | (33,272)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 543 | 612 | 1,087 | 1,224
Remeasurement of projected benefit obligation related to SERP, Tax | (302) | 0 | (302) | 0
Reclassification adjustment for SERP settlement costs included in net income, tax expense (benefit) amount | 66 | 0 | 66 | 0
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 307 | 612 | 851 | 1,224
Total other comprehensive income (loss), Tax Expense (Benefit) | 54,943 | (41,904) | 90,189 | (32,048)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 107,437 | (73,625) | 186,879 | (51,182)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (5,970) | (5,334) | (11,278) | (10,461)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 0 | 0 | (9,687) | (148)
Total securities available for sale and transferred securities, Net of Tax | 101,467 | (78,959) | 165,914 | (61,791)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/lloss, Net of Tax | 1,010 | 1,137 | 2,019 | 2,274
Remeasurement of projected benefit obligation related to SERP, Net of Tax | (560) | 0 | (560) | 0
Reclassification adjustment for SERP settlement costs included in net income, net of tax amount | 121 | 0 | 121 | 0
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 571 | 1,137 | 1,580 | 2,274
Other comprehensive income (loss), net of tax | $ 102,038 | $ (77,822) | $ 167,494 | $ (59,517)

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