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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 17,562,257	$ 16,286,372
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	10,488,716	9,728,501
Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	2,858,433	2,626,479
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	3,218,451	3,111,112
Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	2,490,740	2,343,403
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	1,759,434	1,423,891
Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	161,658	223,616
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	7,073,541	6,557,871
Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	376,045	397,343
Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	6,258,592	5,726,979
Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	133,994	151,945
Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	228,132	206,033
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	76,778	75,571
Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 17,506,981	$ 16,251,838
% of Total Loans	99.70%	99.80%
Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 10,449,992	$ 9,712,205
% of Total Loans	99.60%	99.90%
Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 2,852,482	$ 2,620,567
% of Total Loans	99.80%	99.80%
Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 3,217,364	$ 3,106,421
% of Total Loans	100.00%	99.80%
Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 2,459,054	$ 2,337,710
% of Total Loans	98.70%	99.80%
Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 1,759,434	$ 1,423,891
% of Total Loans	100.00%	100.00%
Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 161,658	$ 223,616
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 7,056,989	$ 6,539,633
% of Total Loans	99.80%	99.70%
Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 375,958	$ 396,908
% of Total Loans	100.00%	99.90%
Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 6,243,082	$ 5,709,529
% of Total Loans	99.80%	99.70%
Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 133,872	$ 151,861
% of Total Loans	99.90%	99.90%
Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 227,331	$ 205,800
% of Total Loans	99.60%	99.90%
Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 76,746	$ 75,535
% of Total Loans	100.00%	100.00%
Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 55,276	$ 34,534
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 38,724	$ 16,296
% of Total Loans	0.40%	0.10%
Non-Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 5,951	$ 5,912
% of Total Loans	0.20%	0.20%
Non-Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 1,087	$ 4,691
% of Total Loans	0.00%	0.20%
Non-Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 31,686	$ 5,693
% of Total Loans	1.30%	0.20%
Non-Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 0	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 0	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 16,552	$ 18,238
% of Total Loans	0.20%	0.40%
Non-Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 87	$ 435
% of Total Loans	0.00%	0.10%
Non-Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 15,510	$ 17,450
% of Total Loans	0.20%	0.30%
Non-Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 122	$ 84
% of Total Loans	0.10%	0.10%
Non-Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 801	$ 233
% of Total Loans	0.40%	0.10%
Non-Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 32	$ 36
% of Total Loans	0.00%	0.00%

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- Definition

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

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