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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 22,432,036	$ 22,359,396
Ratio of loan type to all loans	100.00%	100.00%
Allowance for credit losses on loans	$ 204,522	$ 203,753	$ 179,320	$ 177,207
Loans in process	903,253	1,009,798
Net deferred fees, costs and discounts	263,760	229,491
Total loan contra accounts	1,371,535	1,443,042
Net loans	21,060,501	20,916,354
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 13,117,218	$ 13,127,265
Ratio of loan type to all loans	58.50%	58.70%
Allowance for credit losses on loans	$ 152,468	$ 153,373	139,155	137,194
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 4,829,736	$ 4,658,119
Ratio of loan type to all loans	21.60%	20.80%
Allowance for credit losses on loans	$ 25,997	$ 25,248	13,791	13,155
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 3,637,986	$ 3,757,040
Ratio of loan type to all loans	16.20%	16.80%
Allowance for credit losses on loans	$ 37,873	$ 39,210	29,007	28,842
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,408,693	$ 2,337,139
Ratio of loan type to all loans	10.70%	10.50%
Allowance for credit losses on loans	$ 60,474	$ 58,748	60,836	58,773
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,062,116	$ 2,174,254
Ratio of loan type to all loans	9.20%	9.70%
Allowance for credit losses on loans	$ 20,903	$ 22,267	28,863	29,408
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 178,687	$ 200,713
Ratio of loan type to all loans	0.80%	0.90%
Allowance for credit losses on loans	$ 7,221	$ 7,900	6,658	7,016
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 9,314,818	$ 9,232,131
Ratio of loan type to all loans	41.50%	41.30%
Allowance for credit losses on loans	$ 52,054	$ 50,380	40,165	40,013
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 335,715	$ 384,161
Ratio of loan type to all loans	1.50%	1.70%
Allowance for credit losses on loans	$ 1,219	$ 1,427	2,262	2,781
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 8,520,833	$ 8,399,030
Ratio of loan type to all loans	38.00%	37.60%
Allowance for credit losses on loans	$ 42,117	$ 40,523	28,556	28,029
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 107,205	$ 108,791
Ratio of loan type to all loans	0.50%	0.50%
Allowance for credit losses on loans	$ 2,527	$ 2,564	3,345	3,512
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 275,132	$ 266,151
Ratio of loan type to all loans	1.20%	1.20%
Allowance for credit losses on loans	$ 3,158	$ 3,049	2,973	2,859
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 75,933	$ 73,998
Ratio of loan type to all loans	0.30%	0.30%
Allowance for credit losses on loans	$ 3,033	$ 2,817	$ 3,029	$ 2,832

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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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