v3.21.2

BASIS OF PRESENTATION (Details) | 9 Months Ended
--- | ---
Sep. 30, 2021 subsidiary
BASIS OF PRESENTATION |
Number of inactive wholly owned subsidiaries | 2

X
- Definition Number of inactive wholly owned subsidiaries. + References No definition available. + Details
Name: | ffwm_NumberOfInactiveWhollyOwnedSubsidiaries
Namespace Prefix: | ffwm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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