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Definitive Agreement Definitive Agreement	9 Months Ended
Definitive Agreement Definitive Agreement	Jun. 30, 2018
Business Combinations [Abstract]
Definitive Agreement	DEFINITIVE AGREEMENT On May 23, 2018, the Company announced the signing of a definitive agreement and plan of merger (the "Agreement") with South Sound Bank, a Washington-state chartered bank, pursuant to which South Sound Bank will merge with and into Timberland Bank. Under the terms of the Agreement, based on 1,213,027 shares of South Sound Bank outstanding as of the date of the Agreement, South Sound Bank shareholders will receive 904,918 shares of the Company's common stock and $6.90 million in cash (fixed per share consideration of (i) 0.7460 of a share of the Company's common stock and (ii) $5.68825 in cash). The transaction is expected to close during the fourth calendar quarter of 2018, subject to approval by South Sound Bank shareholders, the receipt of all required regulatory approvals, and the satisfaction of customary closing conditions.