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Timberland Bancorp, Inc. and Subsidiary Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified | Total | MRDP Stock | Stock Options | Preferred Stock | Common Stock | Common Stock MRDP Stock | Common Stock Stock Options | Unearned Shares Issued to ESOP | Retained Earnings | Accumulated Other Compre- hensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period - amount at Sep. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,850 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  | $ 5,850 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Preferred stock discount accretion |  |  |  |  |  | (70)us-gaap_PreferredStockAccretionOfRedemptionDiscount / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  | (70)us-gaap_PreferredStockAccretionOfRedemptionDiscount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Redemption of preferred stock - shares |  |  |  |  |  | (12,065)us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  |  |
Redemption of preferred stock - amount | (12,065)us-gaap_StockRedeemedOrCalledDuringPeriodValue |  |  |  |  | (12,006)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  | (59)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
5% preferred stock dividend | (58)us-gaap_DividendsPreferredStock |  |  |  |  |  |  |  |  |  |  |  | (58)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Common stock dividends ($0.11 per common share) | (1,127)us-gaap_DividendsCommonStock |  |  |  |  |  |  |  |  |  |  |  | (1,127)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Earned ESOP shares, net of tax | 328 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense |  |  |  |  |  | 64 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 264 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareDistributionMember |  |
Stock option/MRDP compensation expense | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | [1] | 4 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | [1] | 112 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | [1] | 4 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | [1] | 112 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Unrealized holding loss on investment securities available for sale, net of tax | (63)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  | (63)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Change in OTTI on investment securities held to maturity, net of tax | 34 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsPeriodIncreaseDecrease |  |  |  |  |  |  |  |  |  |  |  |  | 34 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsPeriodIncreaseDecrease / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accretion of OTTI on investment securities held to maturity, net of tax | (52)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities |  |  |  |  |  |  |  |  |  |  |  |  | (52)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at end of period - amount at Sep. 30, 2014 | 82,778 us-gaap_StockholdersEquity |  |  |  |  | 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 10,773 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | (1,190)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareDistributionMember | 73,534 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (339)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at end of period - shares at Sep. 30, 2014 |  |  |  |  |  | 0 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 7,047,336 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 3,178 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  | 3,178 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Preferred stock discount accretion | 0 us-gaap_PreferredStockAccretionOfRedemptionDiscount |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  | 5,300 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised | 25 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  | 25 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Common stock dividends ($0.11 per common share) | (775)us-gaap_DividendsCommonStock |  |  |  |  |  |  |  |  |  |  |  | (775)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Earned ESOP shares, net of tax | 168 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense |  |  |  |  |  | 36 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 132 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareDistributionMember |  |
Stock option/MRDP compensation expense | 46 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | [1] |  |  | 58 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 46 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | [1] |  |  | 58 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Unrealized holding loss on investment securities available for sale, net of tax | (25)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  | (25)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accretion (Amortization) of Discounts and Premiums, Investments | 15 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments |  |  |  |  |  |  |  |  |  |  |  |  | 15 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at end of period - amount at Mar. 31, 2015 | $ 85,424 us-gaap_StockholdersEquity |  |  |  |  | $ 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 10,892 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | $ (1,058)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareDistributionMember | $ 75,937 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (347)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at end of period - shares at Mar. 31, 2015 |  |  |  |  |  | 0 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 7,052,636 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
[1] | 1998 Management Recognition and Development Plan (“MRDP”).

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration