XML 11 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document and Entity Information - shares
 3 Months Ended
Dec. 31, 2015
Jan. 31, 2016
Document and Entity Information    
Entity Registrant Name TIMBERLAND BANCORP INC,  
Document Type 10-Q  
Document Period End Date Dec. 31, 2015  
Amendment Flag false  
Entity Central Index Key 0001046050  
Current Fiscal Year End Date --09-30  
Entity Common Stock, Shares Outstanding   6,994,948
Entity Filer Category Smaller Reporting Company  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1