Statements of Financial Condition (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Consolidated Statements of Financial Condition [Abstract]
Securities available-for-sale, amortized cost	$ 174,231	$ 174,069
Securities held-to-maturity, fair value	71,218	82,036
Allowance for loan losses	$ 4,288	$ 5,763
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 1,000	$ 1,000
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	7,000	7,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,679,164	3,673,638
Treasury stock, cost	610,513	610,513