v3.25.4
Investment Securities (Investment Securities Held at a Continuous Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Sep. 30, 2025
Schedule of Available For Sale Securities [Line Items]    
Available-for-sale, continuous unrealized loss position, less than 12 Months $ 22,994 $ 18,513
Available-for-sale, continuous unrealized loss position less than 12 Months, Accumulated Loss 30 122
Available-for-sale, continuous unrealized loss position, 12 months or longer 265,073 275,096
Available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 21,370 23,708
Available-for-sale, continuous unrealized loss position 288,067 293,609
Available-for-sale, continuous unrealized loss position, accumulated loss 21,400 23,830
REMIC's    
Schedule of Available For Sale Securities [Line Items]    
Available-for-sale, continuous unrealized loss position, less than 12 Months 22,994 18,513
Available-for-sale, continuous unrealized loss position less than 12 Months, Accumulated Loss 30 122
Available-for-sale, continuous unrealized loss position, 12 months or longer 259,909 269,958
Available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 21,290 23,596
Available-for-sale, continuous unrealized loss position 282,903 288,471
Available-for-sale, continuous unrealized loss position, accumulated loss 21,320 23,718
Fannie Mae Certificates    
Schedule of Available For Sale Securities [Line Items]    
Available-for-sale, continuous unrealized loss position, less than 12 Months 0 0
Available-for-sale, continuous unrealized loss position less than 12 Months, Accumulated Loss 0 0
Available-for-sale, continuous unrealized loss position, 12 months or longer 100 100
Available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 3 3
Available-for-sale, continuous unrealized loss position 100 100
Available-for-sale, continuous unrealized loss position, accumulated loss 3 3
Freddie Mac Certificates    
Schedule of Available For Sale Securities [Line Items]    
Available-for-sale, continuous unrealized loss position, less than 12 Months 0 0
Available-for-sale, continuous unrealized loss position less than 12 Months, Accumulated Loss 0 0
Available-for-sale, continuous unrealized loss position, 12 months or longer 1,115 1,115
Available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 17 19
Available-for-sale, continuous unrealized loss position 1,115 1,115
Available-for-sale, continuous unrealized loss position, accumulated loss 17 19
U.S. government and agency obligations    
Schedule of Available For Sale Securities [Line Items]    
Available-for-sale, continuous unrealized loss position, less than 12 Months 0 0
Available-for-sale, continuous unrealized loss position less than 12 Months, Accumulated Loss 0 0
Available-for-sale, continuous unrealized loss position, 12 months or longer 3,949 3,923
Available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 60 90
Available-for-sale, continuous unrealized loss position 3,949 3,923
Available-for-sale, continuous unrealized loss position, accumulated loss $ 60 $ 90