XML 11 R1.htm IDEA: XBRL DOCUMENT v3.6.0.2
Document and Entity Information - shares
 3 Months Ended
Dec. 31, 2016
Feb. 09, 2017
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-Q  
Document Period End Date Dec. 31, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   7,345,397