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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, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Operating income                      
Interest on deposits in banks                 $ 3,576 $ 1,117 $ 2,535
Interest on investment securities                 3,488 1,195 1,579
Income before income taxes and equity in undistributed     income of Bank $ 8,835 $ 7,210 $ 6,643 $ 6,874 $ 7,543 $ 8,810 $ 8,902 $ 9,173 29,562 34,428 30,307
Benefit for income taxes 1,785 1,472 1,316 1,389 1,525 1,786 1,651 1,883 5,962 6,845 6,038
Net income $ 7,050 $ 5,738 $ 5,327 $ 5,485 $ 6,018 $ 7,024 $ 7,251 $ 7,290 23,600 27,583 24,269
Parent Company                      
Operating income                      
Interest on deposits in banks                 3 5 26
Interest on investment securities                 24 24 5
Dividends from Bank                 10,255 9,085 8,762
Total operating income                 10,282 9,114 8,793
Operating expenses                 303 495 554
Income before income taxes and equity in undistributed     income of Bank                 9,979 8,619 8,239
Benefit for income taxes                 (139) (238) (186)
Income before undistributed income of Bank                 10,118 8,857 8,425
Equity in undistributed income of Bank                     13,482 18,726 15,844
Net income                 $ 23,600 $ 27,583 $ 24,269