Timberland Bancorp, Inc. and Subsidiary Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Mortgage-backed securities and other investments held to maturity-fair value	$ 547	$ 1,285
Allowance for Loan Losses	$ (11,825)	$ (11,946)
Preferred stock par value	$ 0.01	$ 0.01
Preferred stock shares authorized	1,000,000	1,000,000
Preferred stock shares issued	16,641	16,641
Preferred stock shares outstanding	16,641	16,641
Preferred stock per share liquidation value	$ 1,000	$ 1,000
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	50,000,000	50,000,000
Common stock shares issued	7,045,036	7,045,036
Common stock shares outstanding	7,045,036	7,045,036