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Customer Accounts - Schedule of Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Deposit Account Balance
Non-interest checking	$ 2,500,467	$ 2,706,448
Interest checking	4,486,444	3,882,715
Savings	718,560	817,547
Money market	4,111,714	3,358,603
Time deposits	9,556,785	5,305,016
Customer accounts	$ 21,373,970	$ 16,070,329
As a % of Total Deposits
Non-interest checking	11.70%	16.80%
Interest checking	21.00%	24.20%
Savings	3.40%	5.10%
Money market	19.20%	20.90%
Time deposits	44.70%	33.00%
Total	100.00%	100.00%
Weighted Average Rate
Interest checking	2.89%	2.28%
Savings	0.23%	0.21%
Money market	2.22%	1.48%
Time deposits	4.58%	3.77%
Total	3.09%	2.12%	0.51%

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- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount of interest-bearing domestic checking deposit liabilities.

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