v3.3.0.814

Allowance for Loan Losses - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Allowance of purchase impaired loans	1.01%	0.86%
Additional allowance on credit impaired loans	$ 400,000	$ 400,000
Interest income recognized on impaired loans	$ 0	$ 0

X

- Definition

Additional allowance on credit impaired loans.

+ References

No definition available.

+ Details

Name:	ffwm_AdditionalAllowanceOnCreditImpairedLoans
Namespace Prefix:	ffwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of allowance on purchase impaired loans.

+ References

No definition available.

+ Details

Name:	ffwm_PercentageOfAllowanceOnPurchaseImpairedLoans
Namespace Prefix:	ffwm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 15



-Subparagraph (c)(3)



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration