XML 245 R130.htm IDEA: XBRL DOCUMENT
v3.21.2

Fair Value Measurements - Changes in Fair Value of Loans Held for Sale (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | [1]
Fair Value Option Quantitative Disclosures [Line Items] |
Mortgage Banking Income | $ (224)
Mortgage Servicing Rights |
Fair Value Option Quantitative Disclosures [Line Items] |
Mortgage Banking Income | $ (224)
[1] | Included in “Non-interest income.

X
- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
Name: | us-gaap_FairValueOptionChangesInFairValueGainLoss1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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