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Selected Quarterly Financial Data (Unaudited): Selected financial data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Interest and dividend income $ 11,051 $ 10,457 $ 10,290 $ 10,035 $ 9,711 $ 10,165 $ 9,299 $ 9,163      
Interest expense (781) (730) (666) (601) (582) (918) (847) (850) $ (2,778) $ (3,197) $ (4,072)
Net interest income 10,270 9,727 9,624 9,434 9,129 9,247 8,452 8,313 39,055 35,141 30,803
Recapture of loan losses         0 (1,000) (250) 0 0 (1,250) 0
Non-interest income 3,180 3,145 3,082 3,137 3,145 3,156 2,851 3,216 12,544 12,368 10,889
Non-interest expense (1) (7,658) (7,122) (7,221) (7,176) (6,911) (6,938) (6,857) (6,810) (29,177) (27,516) (26,637)
Income before income taxes 5,792 5,750 5,485 5,395 5,363 6,465 4,696 4,719      
Provision for income taxes 1,370 1,334 1,216 1,781 1,748 2,188 1,568 1,572 5,701 7,076 4,901
Net income $ 4,422 $ 4,416 $ 4,269 $ 3,614 $ 3,615 $ 4,277 $ 3,128 $ 3,147 $ 16,721 $ 14,167 $ 10,154
Net income per common share                      
Basic (in dollars per share) $ 0.60 $ 0.60 $ 0.58 $ 0.49 $ 0.50 $ 0.59 $ 0.44 $ 0.46 $ 2.28 $ 1.99 $ 1.48
Diluted (in dollars per share) $ 0.59 $ 0.59 $ 0.57 $ 0.48 $ 0.48 $ 0.58 $ 0.42 $ 0.43 $ 2.22 $ 1.92 $ 1.43