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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

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