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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, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Operating income
Interest on deposits in banks									$ 2,535	$ 5,172	$ 3,198
Investment securities									1,579	1,264	217
Income before income taxes and equity in undistributed     income of Bank									30,307	29,921	22,422
Benefit for income taxes	$ 1,635	$ 1,463	$ 1,225	$ 1,715	$ 1,639	$ 1,552	$ 1,277	$ 1,433	6,038	5,901	5,701
Net income	$ 6,357	$ 6,211	$ 5,049	$ 6,652	$ 6,335	$ 5,956	$ 6,114	$ 5,615	24,269	24,020	16,721
Parent Company
Operating income
Interest on deposits in banks									26	67	37
Interest on loan receivable from ESOP									0	9	53
Investment securities									5	0	0
Dividends from Bank									8,762	6,607	4,429
Total operating income									8,793	6,683	4,519
Operating expenses									554	525	591
Income before income taxes and equity in undistributed     income of Bank									8,239	6,158	3,928
Benefit for income taxes									(186)	(169)	(198)
Income before undistributed income of Bank									8,425	6,327	4,126
Equity in undistributed income of Bank									15,844	17,693	12,595
Net income									$ 24,269	$ 24,020	$ 16,721

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