XML 152 R137.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Regulatory Matters - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Percentage of capital securities qualified as Tier I |  | 25.00% |  | 100.00%
Capital conservation buffer, phase-in period | 5 years |  |  |
Capital conservation buffer, percentage at the beginning stage | 0.625% |  |  |
Capital conservation buffer, percentage fully phased in 2019 | 2.50% |  |  |
Exceeding percentage of Risk-based capital ratio above the minimum requirement for capital adequacy purposes | 4.12% |  |  |
Exceeding percentage of Risk-based capital ratio above the fully-phased in capital conservation buffer | 1.62% |  |  |
Minimum leverage capital ratio to be categorized as well capitalized | 5.00% |  |  |
Minimum Tier 1 risk based capital ratio to be categorized as well capitalized | 8.00% |  |  |
Minimum total risk based capital ratio to be categorized as well capitalized | 10.00% |  |  |
Minimum Common equity Tier 1 risk-based capital ratio | 6.50% |  |  |
Increase decrease in total regulatory capital, common equity, Tier 1 ratio |  | (0.54%) |  |
Increase decrease in total regulatory capital, risk-based capital, Tier 1 ratio |  | (0.56%) |  |
Increase decrease in total regulatory capital, risk-based capital, total ratio |  | (0.62%) |  |
New York Community Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Increase decrease in total regulatory capital, common equity, Tier 1 ratio |  | (0.57%) |  |
Increase decrease in total regulatory capital, risk-based capital, Tier 1 ratio |  | (0.57%) |  |
Increase decrease in total regulatory capital, risk-based capital, total ratio |  | (0.59%) |  |
New York Commercial Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Increase decrease in total regulatory capital, common equity, Tier 1 ratio |  | (0.72%) |  |
Increase decrease in total regulatory capital, risk-based capital, Tier 1 ratio |  | (0.72%) |  |
Increase decrease in total regulatory capital, risk-based capital, total ratio |  | (0.76%) |  |
Multi-Family |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Minimum total risk based capital ratio to be categorized as well capitalized |  |  | 100.00% |
Scenario, Previously Reported | Multi-Family |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Minimum total risk based capital ratio to be categorized as well capitalized |  |  | 50.00% |

X
- Definition Capital Conservation Buffer Percentage, at Beginning Stage + References No definition available. + Details
Name: | nyb_CapitalConservationBufferPercentageAtBeginningStage
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Capital Conservation Buffer Percentage, at Fully Phased-in Stage + References No definition available. + Details
Name: | nyb_CapitalConservationBufferPercentageAtFullyPhasedinStage
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Capital Conservation Buffer, Phase-in Period + References No definition available. + Details
Name: | nyb_CapitalConservationBufferPhaseInPeriod
Namespace Prefix: | nyb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Capital Securities Qualified As Tier One Capital + References No definition available. + Details
Name: | nyb_CapitalSecuritiesQualifiedAsTierOneCapital
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common Equity Tier One Capital Required To Be Well Capitalized To Risk Weighted Assets + References No definition available. + Details
Name: | nyb_CommonEquityTierOneCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Increase (Decrease) in Capital to Risk Weighted Assets + References No definition available. + Details
Name: | nyb_IncreaseDecreaseInCapitalToRiskWeightedAssets
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (Decrease) in Tier One Common Equity to Average Assets + References No definition available. + Details
Name: | nyb_IncreaseDecreaseInTierOneCommonEquityToAverageAssets
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (Decrease) in Tier One Risk Based Capital to Risk Weighted Assets + References No definition available. + Details
Name: | nyb_IncreaseDecreaseInTierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk-Based Capital Ratio in Excess of Fully Phased-in Capital Conservation Buffer, Percentage + References No definition available. + Details
Name: | nyb_RiskbasedCapitalRatioInExcessOfFullyPhasedinCapitalConservationBufferPercentage
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk-Based Capital Ratio in Excess of Minimum Requirement for Capital Adequacy Purposes, Percentage + References No definition available. + Details
Name: | nyb_RiskbasedCapitalRatioInExcessOfMinimumRequirementForCapitalAdequacyPurposesPercentage
Namespace Prefix: | nyb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=nyb_NewYorkCommunityBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nyb_NewYorkCommercialBankMember
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_StatementScenarioAxis=us-gaap_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |