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Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Nov. 30, 2014
Mar. 31, 2014
Document and Entity Information      
Entity Registrant Name TIMBERLAND BANCORP INC,    
Entity Central Index Key 0001046050    
Current Fiscal Year End Date --09-30    
Entity Filer Category Smaller Reporting Company    
Document Type 10-K    
Document Period End Date Sep. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   7,052,036  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 71.4