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Selected Quarterly Financial Data (Unaudited): Selected financial data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Quarterly Financial Information Disclosure [Abstract]                      
Interest and dividend income $ 26,611 $ 25,544 $ 24,865 $ 25,257 $ 25,035 $ 24,139 $ 23,156 $ 22,495 $ 102,277 $ 94,825 $ 79,951
Interest Expense, Operating 8,216 7,922 7,652 8,287 8,488 8,158 7,521 6,491 32,077 30,658 11,592
Net interest income 18,395 17,622 17,213 16,970 16,547 15,981 15,635 16,004 70,200 64,167 68,359
Provision for credit losses, net (221) (440) (246) (27) (490) (244) (81) (336) (934) (1,151) (2,132)
Non-interest income 4,093 2,875 2,687 2,697 2,932 2,791 2,615 2,798 12,352 11,136 11,140
Non-interest expense (11,959) (11,167) (11,194) (11,067) (11,062) (11,069) (10,991) (10,624) (45,387) (43,746) (43,373)
Income before income taxes 10,308 8,890 8,460 8,573 7,927 7,459 7,178 7,842 36,231 30,406 33,994
Provision for income taxes 1,861 1,790 1,705 1,714 1,572 1,535 1,470 1,546 7,070 6,123 6,876
Net income $ 8,447 $ 7,100 $ 6,755 $ 6,859 $ 6,355 $ 5,924 $ 5,708 $ 6,296 $ 29,161 $ 24,283 $ 27,118
Net income per common share                      
Basic (in dollars per share) $ 1.07 $ 0.90 $ 0.85 $ 0.86 $ 0.80 $ 0.74 $ 0.71 $ 0.78 $ 3.68 $ 3.02 $ 3.32
Diluted (in dollars per share) $ 1.07 $ 0.90 $ 0.85 $ 0.86 $ 0.79 $ 0.74 $ 0.70 $ 0.77 $ 3.67 $ 3.01 $ 3.29