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Reclassifications Out of Accumulated Other Comprehensive Loss | 12 Months Ended
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Dec. 31, 2015
Reclassifications Out of Accumulated Other Comprehensive Loss | NOTE 3: RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS
(in thousands) |  | For the Twelve Months Ended December 31, 2015
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 (Loss) Income
Unrealized gains on available-for-sale securities |  | $ | 740 |  |  | Net gain on sales of securities
|  |  | (306 | ) |  | Tax expense
|  | $ | 434 |  |  | Net gain on sales of securities, net of tax
Amortization of defined benefit pension plan items: |  |  |  |  |  |
Prior-service costs |  | $ | 249 |  |  | Included in the computation of net periodic (credit) expense (2)
Actuarial losses |  |  | (8,591 | ) |  | Included in the computation of net periodic (credit) expense (2)
|  |  | (8,342 | ) |  | Total before tax
|  |  | 3,458 |  |  | Tax benefit
|  | $ | (4,884 | ) |  | Amortization of defined benefit pension plan items, net of tax
Total reclassifications for the period |  | $ | 4,450 |  |  |
(1) | Amounts in parentheses indicate expense items.
(2) | Please see Note 12, “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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Namespace Prefix: | nyb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration