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Customer Accounts - Interest Expense on Customer Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Banking and Thrift, Interest [Abstract]
Checking accounts	$ 10,086	$ 5,545	$ 8,447
Savings accounts	1,377	1,143	959
Money market accounts	12,423	8,723	18,951
Time deposit accounts	19,422	27,100	72,494
Interest expense on customer accounts, gross	43,308	42,511	100,851
Less early withdrawal penalties	(267)	(198)	(539)
Interest expense on customer accounts, net	$ 43,041	$ 42,313	$ 100,312
Weighted average interest rate at end of year	0.51%	0.23%	0.48%
Daily weighted average interest rate during the year	0.34%	0.35%	0.94%

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The interest expense recognized during the period on customer deposits or security deposits held in interest bearing accounts.

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Interest expense incurred on demand deposit accounts that represent borrowings rather than outstanding drafts.

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Aggregate amount of interest expense on all deposits.

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Early withdrawal penalties on domestic deposits which discourage customer withdrawal prior to maturity.

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Interest expense incurred on all money market deposits.

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Interest expense incurred on all savings account deposits.

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The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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Weighted average interest rate calculated over time for domestic deposit liability.

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