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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Statement of Financial Position [Abstract]    
Investments securities held to maturity, estimated fair value $ 8,553 $ 7,744
Allowance for loan losses $ 9,544 $ 9,553
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock shares authorized (shares) 1,000,000 1,000,000
Preferred stock shares issued (shares) 0 0
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (shares) 50,000,000 50,000,000
Common stock shares issued (shares) 7,390,227 7,361,077
Common stock shares outstanding (shares) 7,390,227 7,361,077