XML 75 R65.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Activity in Allowance for Losses on Covered Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Valuation Allowance [Line Items] |  |  |  |
Balance, beginning of period |  |  | $ 23,701 | $ 31,395
Recovery of losses on covered loans | $ (6,261) | $ 895 | (10,269) | 719
Balance, end of period |  | $ 26,649 |  | 26,649
Covered | Covered loans held for sale |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Recovery of losses on covered loans |  |  | $ (23,701) | $ (4,746)

X
- Definition Provision Recoveries For Loan Losses + References No definition available. + Details
Name: | nyb_ProvisionRecoveriesForLoanLosses
Namespace Prefix: | nyb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for loan and lease losses covered by loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowanceCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ValuationAllowanceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis=nyb_CoveredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |