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Document and Entity Information
Oct. 31, 2024
Document Information [Line Items]  
Document Period End Date Oct. 31, 2024
Document Type 8-K
Amendment Flag false
Entity Registrant Name FLAGSTAR FINANCIAL, INC.
Entity Central Index Key 0000910073
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 06-1377322
Entity Address, City or Town Hicksville,
Entity Address, Postal Zip Code 11801
City Area Code 516
Local Phone Number 683-4100
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity File Number 1-31565
Entity Address, Address Line One 102 Duffy Avenue,
Entity Address, State or Province NY
Entity Information, Former Legal or Registered Name New York Community Bancorp, Inc.
Common Stock  
Document Information [Line Items]  
Security Exchange Name NYSE
Title of 12(b) Security Common stock, $0.01 par value per share
Trading Symbol FLG
Bifurcated Option Note Unit Securities [Member]  
Document Information [Line Items]  
Security Exchange Name NYSE
Title of 12(b) Security Bifurcated Option Note Unit SecuritiESSM
Trading Symbol FLG PRU
Fixed To Floating Rate Series A Noncumulative Perpetual Preferred Stock [Member]  
Document Information [Line Items]  
Security Exchange Name NYSE
Title of 12(b) Security Depositary Shares each representing a 1/40th interest in a share of Fixed-to-Floating Rate Series A Noncumulative Perpetual Preferred Stock
Trading Symbol FLG PRA