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Investment Securities - Narrative (Details) - USD ($)	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Schedule of Available-for-sale Securities
Federal and state income tax rate			21.00%
Gross gains (losses) from sales of held to maturity			$ 0		$ 0
Debt securities held to maturity, allowance for credit loss	$ 233,000		233,000		236,000
Proceeds from sale of FHLB stock			34,900,000
Purchase of FRB stock			46,700,000
Unrealized gain	12,000		45,000
Unrealized loss		$ 26,000		$ 28,000
Debt securities available for sale, allowance for credit loss	0		0		0
Investment Securities
Schedule of Available-for-sale Securities
Interest receivable	$ 9,100,000		$ 9,100,000		$ 9,000,000.0