Document and Entity Information	9 Months Ended
	Jun. 30, 2013	Jul. 31, 2013
Document and Entity Information
Entity Registrant Name	TIMBERLAND BANCORP INC,
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Amendment Flag	false
Entity Central Index Key	0001046050
Current Fiscal Year End Date	--09-30
Entity Common Stock, Shares Outstanding		7,045,036
Entity Filer Category	Smaller Reporting Company
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3