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INCOME TAXES - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Statutory income tax rate	21.00%	21.00%	21.00%
State income tax	2.30%	2.30%	1.70%
Tax-exempt interest income	(1.70%)	(2.10%)	(1.20%)
Interest expense disallowance	0.90%	1.20%	0.50%
Low-income housing investments	(1.10%)	(1.10%)	(1.30%)
Other differences	0.60%	0.60%	0.10%
Effective income tax rate	22.00%	21.90%	20.80%

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- 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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