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Deposits - Brokered Deposits (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Other Liabilities Disclosure [Abstract] |  |
Brokered money market accounts | $ 137 | $ 1,258
Brokered interest-bearing checking accounts represented | 577 | 1,599
Brokered certificates of deposit | 9,510 | 6,605
Total brokered deposits | $ 10,224 | $ 9,462

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- Definition Interest-Bearing Deposit, Brokered, Checking Account + References No definition available. + Details
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Namespace Prefix: | fbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest-Bearing Domestic Deposit, Brokered, Certificates Of Deposits + References No definition available. + Details
Name: | fbc_InterestBearingDomesticDepositBrokeredCertificatesOfDeposits
Namespace Prefix: | fbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest-Bearing Domestic Deposit, Brokered, Money Market + References No definition available. + Details
Name: | fbc_InterestBearingDomesticDepositBrokeredMoneyMarket
Namespace Prefix: | fbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration