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Other Borrowings (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Maximum line of credit with FHLB $ 227,300,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable $ 220,900,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable  
Outstanding advances from FHLB 135,500,000us-gaap_AdvancesFromFederalHomeLoanBanks 119,000,000us-gaap_AdvancesFromFederalHomeLoanBanks 83,066,000us-gaap_AdvancesFromFederalHomeLoanBanks
Unused credit facility with another financial institution 50,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity    
Single Family Residential Mortgages      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Investments pledged as collateral for FHLB advances 171,700,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ffnw_SingleFamilyResidentialMortgagesMember
170,600,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ffnw_SingleFamilyResidentialMortgagesMember
 
Commercial Real Estate      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Investments pledged as collateral for FHLB advances 105,800,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialRealEstateMember
89,600,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialRealEstateMember
 
Mulitfamily Loans Under Blanket Lien Arrangement      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Investments pledged as collateral for FHLB advances 74,200,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ffnw_MulitfamilyLoansUnderBlanketLienArrangementMember
66,300,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ffnw_MulitfamilyLoansUnderBlanketLienArrangementMember
 
Zero Point Seven One Advance Due October Two Thousand Fifteen [Member] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 10,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSevenOnePercentAdvanceMaturingDueOctoberTwoThousandFifteenMemberDomainDomain
10,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSevenOnePercentAdvanceMaturingDueOctoberTwoThousandFifteenMemberDomainDomain
 
Advances, Fixed Interest Rate 0.71%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSevenOnePercentAdvanceMaturingDueOctoberTwoThousandFifteenMemberDomainDomain
0.71%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSevenOnePercentAdvanceMaturingDueOctoberTwoThousandFifteenMemberDomainDomain
 
Zero Point Eight One Percent Advance Maturing Due March Two Thousand Sixteen [Member] [Domain] [Domain] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 34,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightOnePercentAdvanceMaturingDueMarchTwoThousandSixteenMemberDomainDomainDomain
34,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightOnePercentAdvanceMaturingDueMarchTwoThousandSixteenMemberDomainDomainDomain
 
Advances, Fixed Interest Rate 0.81%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightOnePercentAdvanceMaturingDueMarchTwoThousandSixteenMemberDomainDomainDomain
0.81%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightOnePercentAdvanceMaturingDueMarchTwoThousandSixteenMemberDomainDomainDomain
 
Zero Point Seventy Percent Advance Maturing Due May Two Thousand Sixteen [Member] [Domain] [Domain] [Domain] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSeventyPercentAdvanceMaturingDueMayTwoThousandSixteenMemberDomainDomainDomainDomain
20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSeventyPercentAdvanceMaturingDueMayTwoThousandSixteenMemberDomainDomainDomainDomain
 
Advances, Fixed Interest Rate 0.70%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSeventyPercentAdvanceMaturingDueMayTwoThousandSixteenMemberDomainDomainDomainDomain
0.70%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointSeventyPercentAdvanceMaturingDueMayTwoThousandSixteenMemberDomainDomainDomainDomain
 
One Point Zero Two Percent Advance Maturing Due October Two Thousand Sixteen [Member] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 10,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointZeroTwoPercentAdvanceMaturingDueOctoberTwoThousandSixteenMemberDomain
10,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointZeroTwoPercentAdvanceMaturingDueOctoberTwoThousandSixteenMemberDomain
 
Advances, Fixed Interest Rate 1.02%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointZeroTwoPercentAdvanceMaturingDueOctoberTwoThousandSixteenMemberDomain
1.02%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointZeroTwoPercentAdvanceMaturingDueOctoberTwoThousandSixteenMemberDomain
 
Zero Point Eight Four Percent Advance Maturing Due November Two Thousand Sixteen [Member] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightFourPercentAdvanceMaturingDueNovemberTwoThousandSixteenMemberDomain
20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightFourPercentAdvanceMaturingDueNovemberTwoThousandSixteenMemberDomain
 
Advances, Fixed Interest Rate 0.84%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightFourPercentAdvanceMaturingDueNovemberTwoThousandSixteenMemberDomain
0.84%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightFourPercentAdvanceMaturingDueNovemberTwoThousandSixteenMemberDomain
 
Zero Point Eight Seven Percent Advance Maturing Due April Two Thousand Seventeen [Member] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightSevenPercentAdvanceMaturingDueAprilTwoThousandSeventeenMemberDomain
20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightSevenPercentAdvanceMaturingDueAprilTwoThousandSeventeenMemberDomain
 
Advances, Fixed Interest Rate 0.87%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightSevenPercentAdvanceMaturingDueAprilTwoThousandSeventeenMemberDomain
0.87%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ZeroPointEightSevenPercentAdvanceMaturingDueAprilTwoThousandSeventeenMemberDomain
 
One Point Seven Six Percent Advance Maturing Due November Two Thousand Eighteen [Member] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 5,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointSevenSixPercentAdvanceMaturingDueNovemberTwoThousandEighteenMemberDomain
5,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointSevenSixPercentAdvanceMaturingDueNovemberTwoThousandEighteenMemberDomain
 
Advances, Fixed Interest Rate 1.76%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointSevenSixPercentAdvanceMaturingDueNovemberTwoThousandEighteenMemberDomain
1.76%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointSevenSixPercentAdvanceMaturingDueNovemberTwoThousandEighteenMemberDomain
 
One Point five Two Percent Advance Due June Two Thousand Eighteen [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 6,500,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointfiveTwoPercentAdvanceDueJuneTwoThousandEighteenDomain
   
Advances, Fixed Interest Rate 1.52%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointfiveTwoPercentAdvanceDueJuneTwoThousandEighteenDomain
   
One Point Seven Zero Percent Advance Due May Two Thousand Nineteen [Domain] [Domain]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB 10,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointSevenZeroPercentAdvanceDueMayTwoThousandNineteenDomainDomain
   
Advances, Fixed Interest Rate 1.70%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointSevenZeroPercentAdvanceDueMayTwoThousandNineteenDomainDomain
   
Two Point One Seven Percent Advance Maturing January Two Thousand and Thirteen [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB     50,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointOneSevenPercentAdvanceMaturingJanuaryTwoThousandAndThirteenMember
Advances, Fixed Interest Rate     2.17%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointOneSevenPercentAdvanceMaturingJanuaryTwoThousandAndThirteenMember
Three Point Three Eight Percent Advance Maturing December Two Thousand and Thirteen [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB     7,450,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_ThreePointThreeEightPercentAdvanceMaturingDecemberTwoThousandAndThirteenMember
Advances, Fixed Interest Rate     3.38%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_ThreePointThreeEightPercentAdvanceMaturingDecemberTwoThousandAndThirteenMember
Two Point Nine Four Percent Advance Maturing December Two Thousand and Thirteen [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB     20,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointNineFourPercentAdvanceMaturingDecemberTwoThousandAndThirteenMember
Advances, Fixed Interest Rate     2.94%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointNineFourPercentAdvanceMaturingDecemberTwoThousandAndThirteenMember
Two Point Six Four Percent Advance Maturing December Two Thousand and Thirteen [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB     700,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointSixFourPercentAdvanceMaturingDecemberTwoThousandAndThirteenMember
Advances, Fixed Interest Rate     2.64%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointSixFourPercentAdvanceMaturingDecemberTwoThousandAndThirteenMember
Two Point Nine Eight Percent Advance Maturing April Two Thousand and Fourteen [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB     1,750,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointNineEightPercentAdvanceMaturingAprilTwoThousandAndFourteenMember
Advances, Fixed Interest Rate     2.98%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_TwoPointNineEightPercentAdvanceMaturingAprilTwoThousandAndFourteenMember
One Point Eight Nine Percent Advance Maturing July Two Thousand and Fifteen [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Outstanding advances from FHLB     $ 3,166,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointEightNinePercentAdvanceMaturingJulyTwoThousandAndFifteenMember
Advances, Fixed Interest Rate     1.89%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= ffnw_OnePointEightNinePercentAdvanceMaturingJulyTwoThousandAndFifteenMember