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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, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Operating income                      
Interest on deposits in banks                 $ 3,198 $ 1,586 $ 902
Operating expenses                 1,192 1,074 912
Income before income taxes and equity in undistributed income of Bank                 22,422 21,243 15,055
Benefit for income taxes $ 1,370 $ 1,334 $ 1,216 $ 1,781 $ 1,748 $ 2,188 $ 1,568 $ 1,572 5,701 7,076 4,901
Net income $ 4,422 $ 4,416 $ 4,269 $ 3,614 $ 3,615 $ 4,277 $ 3,128 $ 3,147 16,721 14,167 10,154
Parent Company                      
Operating income                      
Interest on deposits in banks                 37 27 3
Interest on loan receivable from ESOP                 53 96 136
Dividends from Bank                 4,429 1,390 3,039
Total operating income                 4,519 1,513 3,178
Operating expenses                 591 467 430
Income before income taxes and equity in undistributed income of Bank                 3,928 1,046 2,748
Benefit for income taxes                 (198) (385) (183)
Income before undistributed income of Bank                 4,126 1,431 2,931
Equity in undistributed income of Bank                 12,595 12,736 7,223
Net income                 $ 16,721 $ 14,167 $ 10,154