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Timberland Bancorp, Inc. and Subsidiary Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Comprehensive income:
Net income	$ 1,451us-gaap_NetIncomeLoss	$ 1,159us-gaap_NetIncomeLoss	$ 3,178us-gaap_NetIncomeLoss	$ 2,770us-gaap_NetIncomeLoss
Unrealized holding gain (loss) on investment securities available for sale, net of tax	8us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax	(69)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax	(25)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax	(67)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
Change in OTTI on investment securities held to maturity, net of tax:
Additional amount recovered related to credit loss for which OTTI was previously recognized	1tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLossesHeldToMaturitySecuritiesNetOfTax	1tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLossesHeldToMaturitySecuritiesNetOfTax	1tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLossesHeldToMaturitySecuritiesNetOfTax	0tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLossesHeldToMaturitySecuritiesNetOfTax
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold, Held-to-maturity Securities, Net of Tax	1tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldHeldToMaturitySecuritiesNetOfTax	0tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldHeldToMaturitySecuritiesNetOfTax	1tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldHeldToMaturitySecuritiesNetOfTax	0tsbk_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSoldHeldToMaturitySecuritiesNetOfTax
Accretion of OTTI on investment securities held to maturity, net of tax	7us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments	12us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments	15us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments	24us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Other Comprehensive Income (Loss), Net of Tax	17us-gaap_OtherComprehensiveIncomeLossNetOfTax	(56)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income	$ 1,468us-gaap_ComprehensiveIncomeNetOfTax	$ 1,103us-gaap_ComprehensiveIncomeNetOfTax	$ 3,170us-gaap_ComprehensiveIncomeNetOfTax	$ 2,727us-gaap_ComprehensiveIncomeNetOfTax

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