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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Statement of Financial Position [Abstract]    
Investments securities held to maturity, estimated fair value $ 7,912 $ 8,395
Allowance for loan losses $ 9,610 $ 9,826
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) 7,354,577 6,943,868
Common stock shares outstanding (shares) 7,354,577 6,943,868