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Loans and Allowance for Credit Losses, Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) Loan	Sep. 30, 2024 USD ($) Loan
Modifications to Borrowers Experiencing Financial Difficulty [Abstract]
Number of modified loans to borrowers experiencing financial difficulty	7	1
Single Borrower [Member]
Modifications to Borrowers Experiencing Financial Difficulty [Abstract]
Number of modified loans to borrowers experiencing financial difficulty	6
Construction & Development [Member]
Modifications to Borrowers Experiencing Financial Difficulty [Abstract]
Number of modified loans to borrowers experiencing financial difficulty	1
Amortized cost basis | $	$ 1.3
Financing receivables percentage	0.80%
Commercial and Industrial [Member]
Modifications to Borrowers Experiencing Financial Difficulty [Abstract]
Number of modified loans to borrowers experiencing financial difficulty	5
Amortized cost basis | $	$ 4.7	$ 33.4
Modified loan with Subsequent default | $		$ 18.5
Financing receivables percentage	0.90%

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