XML 66 R51.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Summary of Portfolio of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 105,567 |  | $ 199,071
Gross Unrealized Gain | 1,980 |  | 7,988
Gross Unrealized Loss | 3,266 |  | 2,804
Fair Value | 104,281 |  | 204,255
Mortgage-Related Securities | GSE certificates |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 7,786 | [1] | 53,820
Gross Unrealized Gain |  |  | 33
Gross Unrealized Loss | 460 | [1] | 1
Fair Value | 7,326 | [1] | 53,852
Other Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 97,781 |  | 145,251
Gross Unrealized Gain | 1,980 |  | 7,955
Gross Unrealized Loss | 2,806 |  | 2,803
Fair Value | 96,955 |  | 150,403
Other Securities | Municipal bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 583 |  | 725
Gross Unrealized Gain | 48 |  | 70
Fair Value | 631 |  | 795
Other Securities | Capital trust notes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 9,458 |  | 9,444
Gross Unrealized Gain | 2 |  |
Gross Unrealized Loss | 2,217 |  | 2,480
Fair Value | 7,243 |  | 6,964
Other Securities | Preferred stock |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 70,866 |  | 118,205
Gross Unrealized Gain | 1,446 |  | 7,415
Gross Unrealized Loss | 328 |  | 248
Fair Value | 71,984 |  | 125,372
Other Securities | Mutual Funds and Common Stock |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 16,874 | [2] | 16,877
Gross Unrealized Gain | 484 | [2] | 470
Gross Unrealized Loss | 261 | [2] | 75
Fair Value | $ 17,097 | [2] | $ 17,272
[1] | Government-sponsored enterprise.
[2] | Primarily consists of mutual funds that are Community Reinvestment Act-qualified investments.

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=nyb_OtherSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateNoteSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=nyb_MutualFundsAndCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |