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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Statutory income tax rate	21.00%	21.00%	21.00%
State income tax	2.30%	1.70%	1.90%
Tax-exempt interest income	(2.10%)	(1.20%)	(0.90%)
Interest expense disallowance	1.20%	0.50%	0.10%
Low-income housing investments	(1.10%)	(1.30%)	(0.90%)
Other differences	0.60%	0.10%	0.00%
Effective income tax rate	21.90%	20.80%	21.20%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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