Consolidated Statements of Income (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
INTEREST INCOME
Interest and fees on loans receivable	$ 5,606	$ 5,620	$ 11,135	$ 11,018
Interest on mortgage-backed and related securities	757	684	1,533	1,344
Interest on investment securities	330us-gaap_InterestIncomeOperating	269us-gaap_InterestIncomeOperating	647us-gaap_InterestIncomeOperating	555us-gaap_InterestIncomeOperating
Interest-bearing deposits and other	22	15	27	29
FHLB dividends	2fnwb_DividendIncomeFederalHomeLoanBank	2fnwb_DividendIncomeFederalHomeLoanBank	5fnwb_DividendIncomeFederalHomeLoanBank	5fnwb_DividendIncomeFederalHomeLoanBank
Total interest income	6,717	6,590	13,347	12,951
INTEREST EXPENSE
Deposits	382us-gaap_InterestExpenseDeposits	385us-gaap_InterestExpenseDeposits	753us-gaap_InterestExpenseDeposits	789us-gaap_InterestExpenseDeposits
Borrowings	734us-gaap_InterestExpenseBorrowings	827us-gaap_InterestExpenseBorrowings	1,470us-gaap_InterestExpenseBorrowings	1,654us-gaap_InterestExpenseBorrowings
Total interest expense	1,116us-gaap_InterestExpense	1,212us-gaap_InterestExpense	2,223us-gaap_InterestExpense	2,443us-gaap_InterestExpense
Net interest income	5,601us-gaap_InterestIncomeExpenseNet	5,378us-gaap_InterestIncomeExpenseNet	11,124us-gaap_InterestIncomeExpenseNet	10,508us-gaap_InterestIncomeExpenseNet
PROVISION FOR (RECAPTURE OF) LOAN LOSSES	0us-gaap_ProvisionForLoanAndLeaseLosses	(1)us-gaap_ProvisionForLoanAndLeaseLosses	0us-gaap_ProvisionForLoanAndLeaseLosses	432us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for (recapture of) loan losses	5,601	5,379	11,124	10,076
NONINTEREST INCOME
Loan and deposit service fees	824	912	1,659	1,773
Mortgage servicing fees, net of amortization	60	42	133	75
Net gain on sale of loans	41us-gaap_GainLossOnSalesOfLoansNet	151us-gaap_GainLossOnSalesOfLoansNet	138us-gaap_GainLossOnSalesOfLoansNet	354us-gaap_GainLossOnSalesOfLoansNet
Net (loss) on sale of investment securities	0us-gaap_GainLossOnSaleOfSecuritiesNet	0us-gaap_GainLossOnSaleOfSecuritiesNet	0us-gaap_GainLossOnSaleOfSecuritiesNet	(68)us-gaap_GainLossOnSaleOfSecuritiesNet
(Decrease) increase in cash surrender value of bank-owned life insurance	(16)us-gaap_BankOwnedLifeInsuranceIncome	(25)us-gaap_BankOwnedLifeInsuranceIncome	23us-gaap_BankOwnedLifeInsuranceIncome	15us-gaap_BankOwnedLifeInsuranceIncome
Other income	70	79	168	152
Total noninterest income	979us-gaap_NoninterestIncome	1,159us-gaap_NoninterestIncome	2,121us-gaap_NoninterestIncome	2,301us-gaap_NoninterestIncome
NONINTEREST EXPENSE
Compensation and benefits	3,049us-gaap_LaborAndRelatedExpense	2,719us-gaap_LaborAndRelatedExpense	6,089us-gaap_LaborAndRelatedExpense	5,354us-gaap_LaborAndRelatedExpense
Real estate owned and repossessed assets (income) expense, net	(146)	148	(62)	162
Data processing	622	538	1,232	1,032
Occupancy and equipment	768fnwb_OccupancyandEquipmentCosts	738fnwb_OccupancyandEquipmentCosts	1,562fnwb_OccupancyandEquipmentCosts	1,447fnwb_OccupancyandEquipmentCosts
Supplies, postage, and telephone	171	181	331	368
Regulatory assessments and state taxes	78fnwb_RegulatoryFeesandStateTaxExpense	102fnwb_RegulatoryFeesandStateTaxExpense	163fnwb_RegulatoryFeesandStateTaxExpense	209fnwb_RegulatoryFeesandStateTaxExpense
Advertising	144us-gaap_AdvertisingExpense	147us-gaap_AdvertisingExpense	272us-gaap_AdvertisingExpense	276us-gaap_AdvertisingExpense
Professional fees	128us-gaap_ProfessionalFees	194us-gaap_ProfessionalFees	297us-gaap_ProfessionalFees	380us-gaap_ProfessionalFees
FDIC insurance premium	131	130	267	281
Other	497us-gaap_OtherNoninterestExpense	449us-gaap_OtherNoninterestExpense	808us-gaap_OtherNoninterestExpense	803us-gaap_OtherNoninterestExpense
Total noninterest expense	5,442us-gaap_NoninterestExpense	5,346us-gaap_NoninterestExpense	10,959us-gaap_NoninterestExpense	10,312us-gaap_NoninterestExpense
INCOME BEFORE PROVISION FOR INCOME TAXES	1,138	1,192	2,286	2,065
PROVISION FOR INCOME TAXES	256us-gaap_IncomeTaxExpenseBenefit	335us-gaap_IncomeTaxExpenseBenefit	555us-gaap_IncomeTaxExpenseBenefit	528us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 882us-gaap_NetIncomeLoss	$ 857us-gaap_NetIncomeLoss	$ 1,731us-gaap_NetIncomeLoss	$ 1,537us-gaap_NetIncomeLoss

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