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Reclassifications Out of Accumulated Other Comprehensive Loss | 3 Months Ended
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Mar. 31, 2018
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, 2018
Details about Accumulated Other Comprehensive Loss |  | Amount Reclassified from Accumulated Other Comprehensive Loss (1) |  |  | Affected Line Item in the Consolidated Statements of Operations and Comprehensive Income (Loss)
Unrealized gains (losses) on debt securities available-for-sale |  | $ | — |  |  | Net gain on securities
|  |  | — |  |  | Income tax expense
|  | $ | — |  |  | Net gain on sales of securities, net of tax
Amortization of defined benefit pension plan items: |  |  |  |  |  |
Past service liability |  | $ | 62 |  |  | Included in the computation of net periodic (credit) expense (2)
Actuarial losses |  |  | (1,871 | ) |  | Included in the computation of net periodic (credit) expense (2)
|  |  | (1,809 | ) |  | Total before tax
|  |  | 532 |  |  | Tax benefit
|  | $ | (1,277 | ) |  | Amortization of defined benefit pension plan items, net of tax
Total reclassifications for the period |  | $ | (1,277 | ) |  |
(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