XML 96 R82.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Off-Balance-Sheet Originate Loans and Letters of Credit (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | $ 2,543,065 |
Total loan commitments |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 2,034,944 | $ 1,900,000
Commercial, performance stand-by, and financial stand-by letters of credit |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 508,121 | $ 339,400
Total mortgage loan commitments |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 608,734 |
Total mortgage loan commitments | Multi-family and commercial real estate |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 365,788 |
Total mortgage loan commitments | One-to-four family |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 1,478 |
Total mortgage loan commitments | Acquisition, development, and construction |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 241,468 |
Other loan commitments |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | $ 1,426,210 |

X
- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
Name: | nyb_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | nyb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommitmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_LoanOriginationCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=nyb_MortgageLoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=nyb_MultifamilyAndCommercialRealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=nyb_OneToFourFamilyMortgageLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=nyb_AcquisitionDevelopmentAndConstructionMortgageLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=nyb_OtherLoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |