XML 47 R37.htm IDEA: XBRL DOCUMENT
v3.20.2

Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | $ 5,163,064 | [1] | $ 5,841,796
Gross Unrealized Gain |  | 136,449 | [1] | 77,498
Gross Unrealized Loss |  | 34,321 | [1] | 33,407
Fair Value |  | 5,265,192 | [1] | 5,885,887
Asset-backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 541,390 | [2] | 384,108
Gross Unrealized Gain | [2] | 850 |  |
Gross Unrealized Loss |  | 9,987 | [2] | 10,854
Fair Value |  | 532,253 | [2] | 373,254
Mutual Funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 15,815 |  |
Gross Unrealized Gain |  | 342 |  |
Fair Value |  | 16,157 |  |
Mutual Funds and Common Stock |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  |  |  | 16,871
Gross Unrealized Gain |  |  |  | 718
Gross Unrealized Loss |  |  |  | 173
Fair Value |  |  |  | 17,416
Mortgage-related Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 2,544,414 |  | 3,313,757
Gross Unrealized Gain |  | 108,690 |  | 47,282
Gross Unrealized Loss |  | 108 |  | 7,304
Fair Value |  | 2,652,996 |  | 3,353,735
Mortgage-related Securities | GSE Certificates |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 1,160,210 |  | 1,530,317
Gross Unrealized Gain |  | 58,146 |  | 26,069
Gross Unrealized Loss |  | 25 |  | 3,763
Fair Value |  | 1,218,331 |  | 1,552,623
Mortgage-related Securities | GSE CMOs |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 1,384,204 |  | 1,783,440
Gross Unrealized Gain |  | 50,544 |  | 21,213
Gross Unrealized Loss |  | 83 |  | 3,541
Fair Value |  | 1,434,665 |  | 1,801,112
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 2,587,543 |  | 2,495,876
Gross Unrealized Gain |  | 27,417 |  | 29,376
Gross Unrealized Loss |  | 34,212 |  | 25,930
Fair Value |  | 2,580,748 |  | 2,499,322
Debt Securities | U.S. Treasury Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 61,986 |  | 41,820
Gross Unrealized Gain |  | 1 |  | 19
Gross Unrealized Loss |  | 3 |  |
Fair Value |  | 61,984 |  | 41,839
Debt Securities | GSE Debentures |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 991,865 |  | 1,093,845
Gross Unrealized Gain |  | 5,739 |  | 5,707
Gross Unrealized Loss |  | 3,639 |  | 5,312
Fair Value |  | 993,965 |  | 1,094,240
Debt Securities | Municipal Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 26,304 |  | 26,808
Gross Unrealized Gain |  | 667 |  | 559
Gross Unrealized Loss |  | 114 |  | 475
Fair Value |  | 26,857 |  | 26,892
Debt Securities | Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 870,610 |  | 854,195
Gross Unrealized Gain |  | 14,949 |  | 15,970
Gross Unrealized Loss |  | 8,761 |  | 2,983
Fair Value |  | 876,798 |  | 867,182
Debt Securities | Capital Trust Notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 95,388 |  | 95,100
Gross Unrealized Gain |  | 5,211 |  | 7,121
Gross Unrealized Loss |  | 11,708 |  | 6,306
Fair Value |  | 88,891 |  | 95,915
Mortgage Backed Securities And Other Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 5,131,957 |  | 5,809,633
Gross Unrealized Gain |  | 136,107 |  | 76,658
Gross Unrealized Loss |  | 34,320 |  | 33,234
Fair Value |  | 5,233,744 |  | 5,853,057
Equity Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 31,107 |  | 32,163
Gross Unrealized Gain |  | 342 |  | 840
Gross Unrealized Loss |  | 1 |  | 173
Fair Value |  | 31,448 |  | 32,830
Equity Securities | Preferred stock |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 15,292 |  | 15,292
Gross Unrealized Gain |  |  |  | 122
Gross Unrealized Loss |  | 1 |  |
Fair Value |  | $ 15,291 |  | $ 15,414
[1] | Excludes accrued interest receivable of $14.0 million included in other assets in the Consolidated Statements of Condition.
[2] | The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&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 No definition available. + 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 No definition available. + 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_InvestmentTypeAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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_InvestmentTypeAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
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_CorporateBondSecuritiesMember
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_FairValueByAssetClassAxis=nycb_MortgageBackedSecuritiesAndOtherSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
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: |