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Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivables for loans	$ 73,192	$ 57,070
Loans pledged to secure borrowings from the Federal Home Loan Bank	8,963,870	$ 8,224,951
Nonaccrual interest income recognized	2,079
Impaired, interest income on accrual accrual and performed loans	$ 1,372
Basis point reduction, minimum	1.00%
Basis point reduction, maximum	2.00%
Percent of TDRs classified as performing	98.60%
Single family residential loans as percentage of restructured loans	81.30%
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction	6 months
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction	24 months
Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring, amount	$ 49,307

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Amount, before allowance for credit loss, of accrued interest on financing receivable.

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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

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Amount of interest income on financing receivable on nonaccrual status.

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Financing Receivables, Percent of Troubled Debt Restructuring Classified as Performing

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Single Family Residential Loans as Percentage of Restructured Loans

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