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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, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income | $ 9,711 |  | $ 10,165 |  | $ 9,299 |  | $ 9,163 |  | $ 8,938 | $ 8,596 | $ 8,650 | $ 8,691 |  |  |
Interest expense | (582) |  | (918) |  | (847) |  | (850) |  | (1,132) | (980) | (979) | (981) | $ (3,197) | $ (4,072) | $ (3,890)
Net interest income | 9,129 |  | 9,247 |  | 8,452 |  | 8,313 |  | 7,806 | 7,616 | 7,671 | 7,710 | 35,141 | 30,803 | 27,278
Recapture of loan losses | 0 |  | (1,000) |  | (250) |  | 0 |  |  |  |  |  | (1,250) | 0 | (1,525)
Non-interest income | 3,145 |  | 3,156 |  | 2,851 |  | 3,216 |  | 3,109 | 2,749 | 2,513 | 2,518 | 12,368 | 10,889 | 9,522
Non-interest expense | (6,911) |  | (6,938) |  | (6,857) |  | (6,810) |  | (6,961) | (6,568) | (6,629) | (6,479) | (27,516) | (26,637) | (25,841)
Income before income taxes | 5,363 |  | 6,465 |  | 4,696 |  | 4,719 |  | 3,954 | 3,797 | 3,555 | 3,749 |  |  |
Provision for income taxes | 1,748 |  | 2,188 |  | 1,568 |  | 1,572 |  | 1,255 | 1,250 | 1,175 | 1,221 | 7,076 | 4,901 | 4,192
Net income | $ 3,615 |  | $ 4,277 |  | $ 3,128 |  | $ 3,147 |  | $ 2,699 | $ 2,547 | $ 2,380 | $ 2,528 | $ 14,167 | $ 10,154 | $ 8,292
Net income per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.50 | [1] | $ 0.59 | [1] | $ 0.44 | [1] | $ 0.46 | [1] | $ 0.40 | $ 0.37 | $ 0.35 | $ 0.37 | $ 1.99 | $ 1.48 | $ 1.20
Diluted (in dollars per share) | $ 0.48 | [1] | $ 0.58 | [1] | $ 0.42 | [1] | $ 0.43 | [1] | $ 0.38 | $ 0.36 | $ 0.34 | $ 0.36 | $ 1.92 | $ 1.43 | $ 1.17
[1] | The net income per common share amounts for the quarters do not add to the total for the fiscal year due to rounding.

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