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Reclassifications Out of Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2018
Reclassifications Out of Accumulated Other Comprehensive Loss | Note 3. Reclassifications Out of Accumulated Other Comprehensive Loss
(in thousands) |  | For the Six Months Ended June 30, 2018
Details about Accumulated Other Comprehensive Loss |  | Amount Reclassified from Accumulated Other Comprehensive Loss (1) |  | Affected Line Item in the Consolidated Statement of Operations and Comprehensive Income (Loss)
Unrealized gains (losses) on debt securities available-for-sale |  |  | $ | -- |  |  | Net (loss) gain on securities
|  |  |  | -- |  |  | Income tax expense
|  |  | $ | -- |  |  | Total net (loss) gain on securities
Amortization of defined benefit pension plan items: |  |  |  |  |  |  |
Past service liability |  |  | $ | 124 |  |  | Included in the computation of net periodic (credit) expense (2)
Actuarial losses |  |  |  | (3,744) |  |  | Included in the computation of net periodic (credit) expense (2)
|  |  |  | (3,620) |  |  | Total before tax
|  |  |  | 1,065 |  |  | Tax benefit
|  |  |  | $(2,555) |  |  | Amortization of defined benefit pension plan items, net of tax
Total reclassifications for the period |  |  |  | $(2,555) |  |  |
(1) | Amounts in parentheses indicate expense items.
(2) | See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.

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- Definition Accumulated Other Comprehensive Income [Text Block] + References No definition available. + Details
Name: | nyb_AccumulatedOtherComprehensiveIncomeTextBlock
Namespace Prefix: | nyb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration