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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.