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Reclassifications Out of Accumulated Other Comprehensive Loss | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Reclassifications Of Accumulated Other Comprehensive Loss [Abstract] |  |
Reclassifications Out of Accumulated Other Comprehensive Loss | Note 3: Reclassifications out of Accumulated Other Comprehensive Loss
(in thousands) |  | For the Three Months Ended March 31, 2021
Details about Accumulated Other Comprehensive Loss |  | Amount Reclassified out of Accumulated Other Comprehensive Loss (1) |  |  | Affected Line Item in the Consolidated Statements of Income and Comprehensive Income
Unrealized gains (losses) on available-for-sale securities: |  | $ | — |  |  | Net gain (losses) on securities
|  |  | — |  |  | Income tax expense
|  | $ | — |  |  | Net gain (losses) on securities, net of tax
Unrealized loss on cash flow hedges: |  | $ | (5,891 | ) |  | Interest expense
|  |  | 1,617 |  |  | Income tax benefit
|  | $ | (4,274 | ) |  | Net loss on cash flow hedges, net of tax
Amortization of defined benefit pension plan items: |  |  |  |  |  |
Past service liability |  | $ | 62 |  |  | Included in the computation of net periodic credit (2)
Actuarial losses |  |  | (1,743 | ) |  | Included in the computation of net periodic cost (2)
|  |  | (1,681 | ) |  | Total before tax
|  |  | 462 |  |  | Income tax benefit
|  | $ | (1,219 | ) |  | Amortization of defined benefit pension plan items, net of tax
Total reclassifications for the period |  | $ | (5,493 | ) |  |
(1) | Amounts in parentheses indicate expense items.
(2) | See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.
| NOTE 3: RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS
(in thousands) |  | For the Twelve Months Ended December 31, 2020 |
Details about Accumulated Other Comprehensive Loss |  | Amount Reclassified out of Accumulated Other Comprehensive Loss (1) |  |  | Affected Line Item in the Consolidated Statements of Income and Comprehensive Income |
Unrealized gains on available-for-sale securities: |  | $ | 683 |  |  |  | Net gain on securities |
|  |  | (188 | ) |  |  | Income tax expense |
|  | $ | 495 |  |  |  | Net gain on securities, net of tax |
Unrealized gains on cash flow hedges: |  | $ | (11,767 | ) |  |  | Interest expense |
|  |  | 3,236 |  |  |  | Income tax benefit |
|  | $ | (8,531 | ) |  |  | Net gain on cash flow hedges, net of tax |
Amortization of defined benefit pension plan items: |  |  |  |  |  |  |  |
Past service liability |  | $ | 249 |  |  |  | Included in the computation of net periodic credit (2) |
Actuarial losses |  |  | (7,352 | ) |  |  | Included in the computation of net periodic cost (2) |
|  |  | (7,103 | ) |  |  | Total before tax |
|  |  | 1,953 |  |  |  | Income tax benefit |
|  | $ | (5,150 | ) |  |  | Amortization of defined benefit pension plan items, net of tax |
Total reclassifications for the period |  | $ | (13,186 | ) |  |  |  |
(1) | Amounts in parentheses indicate expense items.
(2) | See Note 14, “Employee Benefits,” for additional information.

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- Definition Accumulated Other Comprehensive Income [Text Block] + References No definition available. + Details
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- Definition Reclassifications of accumulated other comprehensive loss. + References No definition available. + Details
Name: | nycb_ReclassificationsOfAccumulatedOtherComprehensiveLossAbstract
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