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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, 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
Operating income                      
Interest on deposits in banks                 $ 5,172 $ 3,198 $ 1,586
Operating expenses                 1,358 1,192 1,074
Income before income taxes and equity in undistributed income of Bank                 29,921 22,422 21,243
Benefit 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
Parent Company                      
Operating income                      
Interest on deposits in banks                 67 37 27
Interest on loan receivable from ESOP                 9 53 96
Dividends from Bank                 6,607 4,429 1,390
Total operating income                 6,683 4,519 1,513
Operating expenses                 525 591 467
Income before income taxes and equity in undistributed income of Bank                 6,158 3,928 1,046
Benefit for income taxes                 (169) (198) (385)
Income before undistributed income of Bank                 6,327 4,126 1,431
Equity in undistributed income of Bank                 17,693 12,595 12,736
Net income                 $ 24,020 $ 16,721 $ 14,167