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Timberland Bancorp, Inc. and Subsidiary Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |
Unrealized holding loss on investment securities available for sale, tax | $ 6 | $ 4 | $ (1) | $ 2
Reclassification adjustment for gain on sale of investment securities available for sale included in net income, tax | 0 | 0 | 0 | (15)
Additional amount recovered related to credit loss for which OTTI was previously recognized, tax | 6 | 1 | 7 | 1
Amount reclassified to previously recorded market loss, tax | (1) | 1 | (1) | 1
Accretion of OTTI on investment securities held to maturity, tax | $ 4 | $ 4 | $ 9 | $ 8

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