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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 2,380 $ 1,451 $ 4,908 $ 3,178
Denominator – weighted average common shares outstanding (in shares) 6,846,527 6,898,192 6,858,190 6,895,038
Basic net income per common share (in dollars per share) $ 0.35 $ 0.21 $ 0.72 $ 0.46
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) [1] 62,028 36,730 57,482 36,775
Effect of dilutive stock warrant (in shares) [2] 171,450 136,870 166,273 135,808
Weighted average common shares and common stock equivalents (in shares) 7,080,005 7,071,792 7,081,945 7,067,621
Diluted net income per common share (in dollars per share) $ 0.34 $ 0.21 $ 0.69 $ 0.45
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 14,000 122,000 84,383 122,000
Warrant        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares)     370,899  
Common Stock        
Earnings Per Share, Diluted [Abstract]        
Class of warrant, exercise price (in dollars per share) $ 6.73   $ 6.73  
[1] For the three and six months ended March 31, 2016, average options to purchase 14,000 and 84,383 shares of common stock, respectively, were outstanding but not included in the computation of diluted net income per share because their effect would have been anti-dilutive. For both the three and six months ended March 31, 2015, average options to purchase 122,000 shares of common stock were outstanding but not included in the computation of diluted net income per common share because their effect would have been anti-dilutive.
[2] Represents a warrant to purchase 370,899 shares of the Company's common stock at an exercise price of $6.73 per share (subject to anti-dilution adjustments) at any time through December 23, 2018 (the "Warrant"). The Warrant was granted on December 23, 2008 to the U.S. Treasury Department ("Treasury") as part of the Company's participation in the Treasury's Troubled Asset Relief Program ("TARP"). On June 12, 2013, the Treasury sold the Warrant to private investors.