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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 22,359,396	$ 19,648,504
Ratio of loan type to all loans	100.00%	100.00%
Allowance for loan losses	$ 203,753	$ 177,207	$ 172,808
Loans in process	1,009,798	1,895,940
Net deferred fees, costs and discounts	229,491	98,807
Total loan contra accounts	1,443,042	2,171,954
Net loans	20,916,354	17,476,550
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 13,127,265	$ 12,094,294
Ratio of loan type to all loans	58.70%	61.60%
Allowance for loan losses	$ 153,373	$ 137,194	133,476
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 4,658,119	$ 2,907,086
Ratio of loan type to all loans	20.80%	14.80%
Allowance for loan losses	$ 25,248	$ 13,155	12,013
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 3,757,040	$ 3,344,959
Ratio of loan type to all loans	16.80%	17.00%
Allowance for loan losses	$ 39,210	$ 28,842	25,814
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,337,139	$ 2,321,717
Ratio of loan type to all loans	10.40%	11.80%
Allowance for loan losses	$ 58,748	$ 58,773	57,210
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,174,254	$ 3,318,994
Ratio of loan type to all loans	9.70%	16.90%
Allowance for loan losses	$ 22,267	$ 29,408	26,161
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 200,713	$ 201,538
Ratio of loan type to all loans	1.00%	1.00%
Allowance for loan losses	$ 7,900	$ 7,016	12,278
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 9,232,131	$ 7,554,210
Ratio of loan type to all loans	41.30%	38.40%
Allowance for loan losses	$ 50,380	$ 40,013	39,332
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 384,161	$ 672,643
Ratio of loan type to all loans	1.70%	3.40%
Allowance for loan losses	$ 1,427	$ 2,781	3,410
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 8,399,030	$ 6,451,270
Ratio of loan type to all loans	37.60%	32.80%
Allowance for loan losses	$ 40,523	$ 28,029	25,518
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 108,791	$ 125,723
Ratio of loan type to all loans	0.50%	0.60%
Allowance for loan losses	$ 2,564	$ 3,512	5,047
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 266,151	$ 234,410
Ratio of loan type to all loans	1.20%	1.20%
Allowance for loan losses	$ 3,049	$ 2,859	2,482
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 73,998	$ 70,164
Ratio of loan type to all loans	0.30%	0.40%
Allowance for loan losses	$ 2,817	$ 2,832	$ 2,875

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Name Accounting Standards Codification
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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

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Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement.

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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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