Name:	ffwm_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix:	ffwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Business acquisition pro forma interest income expense net.

No definition available.

Name:	ffwm_BusinessAcquisitionProFormaInterestIncomeExpenseNet
Namespace Prefix:	ffwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Business acquisition pro forma net earning per share.

No definition available.

Name:	ffwm_BusinessAcquisitionProFormaNetEarningPerShareAbstract
Namespace Prefix:	ffwm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Business acquisition pro forma non interest expense.

No definition available.

Name:	ffwm_BusinessAcquisitionProFormaNonInterestExpense
Namespace Prefix:	ffwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Business acquisition pro forma non interest income.

No definition available.

Name:	ffwm_BusinessAcquisitionProFormaNonInterestIncome
Namespace Prefix:	ffwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Business acquisition pro forma provision for loan losses and lease losses.

No definition available.

Name:	ffwm_BusinessAcquisitionProFormaProvisionForLoanAndLeaseLosses
Namespace Prefix:	ffwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Business acquisitions pro forma income tax expense benefit.

No definition available.

Name:	ffwm_BusinessAcquisitionsProFormaIncomeTaxExpenseBenefit
Namespace Prefix:	ffwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.