v3.22.1

DEPOSITS - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
DEPOSITS |  |
Certificates of deposits of $250,000 or more, maturities within one year | $ 352 | $ 361
Certificates of deposits of $250,000 or more, maturities after one year | 5 | 6
Certificates of deposits of $250,000 or more, total | 357 | 367
Certificates of deposit of less than $ 250,000, maturities within one year | 223 | 229
Certificates of deposit of less than $ 250,000, maturities after one year | 59 | 72
Certificates of deposit of less than $250,000, total | $ 282 | $ 301

X
- Definition Time deposits 250000 or more. + References No definition available. + Details
Name: | ffwm_TimeDeposits250000OrMore
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Time deposits 250000 or more, maturities after one year. + References No definition available. + Details
Name: | ffwm_TimeDeposits250000OrMoreMaturitiesAfterOneYear
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Time deposits 250000 or more, maturities with in one year. + References No definition available. + Details
Name: | ffwm_TimeDeposits250000OrMoreMaturitiesWithInOneYear
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Time deposits less than 250000. + References No definition available. + Details
Name: | ffwm_TimeDepositsLessThan250000
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Time deposits less than 250000, maturities after one year. + References No definition available. + Details
Name: | ffwm_TimeDepositsLessThan250000MaturitiesAfterOneYear
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Time deposits less than 250000, maturities with in one year. + References No definition available. + Details
Name: | ffwm_TimeDepositsLessThan250000MaturitiesWithInOneYear
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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