v3.8.0.1

Allowance for Loan Losses - Balance in Allowance for Loan Losses and Recorded Investment in Loans by Impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 909 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 17,491 | $ 15,400
Total Allowance for Loan Losses | 18,400 | 15,400
Unaccreted Credit Component Other Loans | 3,005 | 432
Loans, Individually Evaluated for Impairment | 13,436 | 8,994
Loans, Collectively Evaluated for Impairment | 3,600,909 | 2,539,649
Total loans | 3,655,262 | 2,552,016
Unaccreted Credit Component Other Loans | 260,577 | 59,037
Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable Impaired [Line Items] |  |
Loans, Purchased Impaired | 3,757 | 3,373
Residential Properties |  |
Financing Receivable Impaired [Line Items] |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,715 | 6,669
Total Allowance for Loan Losses | 9,715 | 6,669
Unaccreted Credit Component Other Loans | 248 | 128
Loans, Individually Evaluated for Impairment |  | 6,093
Loans, Collectively Evaluated for Impairment | 2,581,245 | 1,774,796
Total loans | 2,581,245 | 1,780,889
Unaccreted Credit Component Other Loans | 26,605 | 12,373
Commercial Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,399 | 2,983
Total Allowance for Loan Losses | 4,399 | 2,983
Unaccreted Credit Component Other Loans | 1,449 | 136
Loans, Individually Evaluated for Impairment | 4,037 | 2,148
Loans, Collectively Evaluated for Impairment | 691,632 | 474,634
Total loans | 696,748 | 476,959
Unaccreted Credit Component Other Loans | 168,057 | 24,796
Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable Impaired [Line Items] |  |
Loans, Purchased Impaired | 1,079 | 177
Commercial and Industrial Loans |  |
Financing Receivable Impaired [Line Items] |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 909 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 2,715 | 5,227
Total Allowance for Loan Losses | 3,624 | 5,227
Unaccreted Credit Component Other Loans | 1,204 | 147
Loans, Individually Evaluated for Impairment | 9,399 | 753
Loans, Collectively Evaluated for Impairment | 299,539 | 233,992
Total loans | 310,779 | 237,941
Unaccreted Credit Component Other Loans | 62,849 | 20,165
Commercial and Industrial Loans | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable Impaired [Line Items] |  |
Loans, Purchased Impaired | 1,841 | 3,196
Consumer Loans |  |
Financing Receivable Impaired [Line Items] |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 267 | 288
Total Allowance for Loan Losses | 267 | 288
Unaccreted Credit Component Other Loans | 100 | 19
Loans, Collectively Evaluated for Impairment | 29,330 | 32,127
Total loans | 29,330 | 32,127
Unaccreted Credit Component Other Loans | 2,899 | 1,266
Land |  |
Financing Receivable Impaired [Line Items] |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 395 | 233
Total Allowance for Loan Losses | 395 | 233
Unaccreted Credit Component Other Loans | 4 | 2
Loans, Collectively Evaluated for Impairment | 837 | 24,100
Total loans | 37,160 | 24,100
Unaccreted Credit Component Other Loans | 167 | $ 437
Land | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable Impaired [Line Items] |  |
Loans, Purchased Impaired | $ 837 |

X
- Definition Allowance for loan losses in unaccreted credit component other loans. + References No definition available. + Details
Name: | ffwm_AllowanceForLoanLossesInUnaccretedCreditComponentOtherLoans
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and lease receivable in unaccreted credit component other loan. + References No definition available. + Details
Name: | ffwm_LoansAndLeaseReceivableInUnaccretedCreditComponentOtherLoan
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loans and leases receivable allowance impaired. + References No definition available. + Details
Name: | ffwm_LoansAndLeasesReceivableAllowanceImpaired
Namespace Prefix: | ffwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis=us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorPropertyClassAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |