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Condensed Financial Information - Parent Company Only: Condensed Statements of Operations, Parent Company (Details) - USD ($)
$ 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
Operating income                      
Interest on deposits in banks                 $ 1,586 $ 902 $ 491
Operating expenses                 1,074 912 812
Income before income taxes and equity in undistributed income of Bank                 21,243 15,055 12,484
Benefit 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
Parent Company                      
Operating income                      
Interest on deposits in banks                 27 3 0
Interest on loan receivable from ESOP                 96 136 173
Dividends from Bank                 1,390 3,039 2,698
Total operating income                 1,513 3,178 2,871
Operating expenses                 467 430 445
Income before income taxes and equity in undistributed income of Bank                 1,046 2,748 2,426
Benefit for income taxes                 (385) (183) (150)
Income before undistributed income of Bank                 1,431 2,931 2,576
Equity in undistributed income of Bank                 12,736 7,223 5,716
Net income                 $ 14,167 $ 10,154 $ 8,292