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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Interest and dividend income $ 14,384 $ 14,185 $ 13,841 $ 13,315 $ 11,051 $ 10,457 $ 10,290 $ 10,035      
Interest expense (1,233) (1,248) (1,113) (971) (781) (730) (666) (601) $ (4,565) $ (2,778) $ (3,197)
Net interest income 13,151 12,937 12,728 12,344 10,270 9,727 9,624 9,434 51,160 39,055 35,141
Non-interest income 3,597 3,538 3,940 3,266 3,180 3,145 3,082 3,137 14,341 12,544 12,368
Non-interest expense (8,774) (8,967) (9,277) (8,562) (7,658) (7,122) (7,221) (7,176) (35,580) (29,177) (27,516)
Income before income taxes 7,974 7,508 7,391 7,048 5,792 5,750 5,485 5,395      
Provision for income taxes 1,639 1,552 1,277 1,433 1,370 1,334 1,216 1,781 5,901 5,701 7,076
Net income $ 6,335 $ 5,956 $ 6,114 $ 5,615 $ 4,422 $ 4,416 $ 4,269 $ 3,614 $ 24,020 $ 16,721 $ 14,167
Net income per common share                      
Basic (in dollars per share) $ 0.76 $ 0.71 $ 0.74 $ 0.68 $ 0.60 $ 0.60 $ 0.58 $ 0.49 $ 2.89 $ 2.28 $ 1.99
Diluted (in dollars per share) $ 0.75 $ 0.70 $ 0.72 $ 0.66 $ 0.59 $ 0.59 $ 0.57 $ 0.48 $ 2.84 $ 2.22 $ 1.92