XML 80 R66.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Information Regarding Troubled Debt Restructurings (Detail) - Non-Covered Loans - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | $ 45,556 | $ 19,920
Multi-Family |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 8,885 | 10,736
Commercial Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 368 | 1,861
One-to-four family |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 1,066 | 1,971
Acquisition, Development and Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 8,652 |
Commercial and Industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 26,585 | 5,150
Other loans |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings |  | 202
Accruing |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 9,653 | 3,466
Accruing | Multi-Family |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 824 | 1,981
Accruing | One-to-four family |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings |  | 222
Accruing | Acquisition, Development and Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 8,652 |
Accruing | Commercial and Industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 177 | 1,263
Non-Accrual |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 35,903 | 16,454
Non-Accrual | Multi-Family |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 8,061 | 8,755
Non-Accrual | Commercial Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 368 | 1,861
Non-Accrual | One-to-four family |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | 1,066 | 1,749
Non-Accrual | Commercial and Industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings | $ 26,408 | 3,887
Non-Accrual | Other loans |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings |  | $ 202

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_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nyb_AccrualLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nyb_NonAccrualLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |