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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net gain on securities |  | $ 534 | $ 5,409
Interest expense |  | 196,575 | 204,849
Income tax expense |  | (14,915) | (30,988)
Net income |  | 100,328 | $ 97,577
Reclassifications, net of tax | [1] | (278) |
Past service liability |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, before tax | [1],[2] | 62 |
Actuarial losses |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, before tax | [1],[2] | (1,837) |
Amortization of defined benefit pension |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, before tax | [1] | (1,775) |
Tax benefit | [1] | 487 |
Reclassifications, net of tax | [1] | (1,288) |
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available-for-sale securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net gain on securities | [1] | 749 |
Income tax expense | [1] | (206) |
Net income | [1] | 543 |
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains (loss) on cash flow hedges |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | [1] | 645 |
Income tax expense | [1] | (178) |
Net income | [1] | $ 467 |
[1] | Amounts in parentheses indicate expense items.
[2] | See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.

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