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Allowance for Loan Losses - Gross Loans by Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 17,653,757	$ 16,286,372
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	10,507,610	9,728,501
Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,886,594	2,626,479
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	3,310,101	3,111,112
Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,315,318	2,343,403
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	1,838,936	1,423,891
Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	156,661	223,616
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	7,146,147	6,557,871
Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	324,451	397,343
Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	6,388,990	5,726,979
Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	124,842	151,945
Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	237,754	206,033
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	70,110	75,571
Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 17,603,335	$ 16,251,838
% of Total Loans	99.70%	99.80%
Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 10,472,966	$ 9,712,205
% of Total Loans	99.70%	99.80%
Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,881,467	$ 2,620,567
% of Total Loans	99.80%	99.80%
Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 3,286,666	$ 3,106,421
% of Total Loans	99.30%	99.80%
Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,309,236	$ 2,337,710
% of Total Loans	99.70%	99.80%
Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 1,838,936	$ 1,423,891
% of Total Loans	100.00%	100.00%
Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 156,661	$ 223,616
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 7,130,369	$ 6,539,633
% of Total Loans	99.80%	99.70%
Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 324,363	$ 396,908
% of Total Loans	100.00%	99.90%
Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 6,374,072	$ 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]
Amount	$ 124,833	$ 151,861
% of Total Loans	100.00%	99.90%
Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 237,018	$ 205,800
% of Total Loans	99.70%	99.90%
Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 70,083	$ 75,535
% of Total Loans	100.00%	100.00%
Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 50,422	$ 34,534
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 34,644	$ 16,296
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 5,127	$ 5,912
% of Total Loans	0.20%	0.20%
Non-Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 23,435	$ 4,691
% of Total Loans	0.70%	0.20%
Non-Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 6,082	$ 5,693
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 15,778	$ 18,238
% of Total Loans	0.20%	0.30%
Non-Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 88	$ 435
% of Total Loans	0.00%	0.10%
Non-Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 14,918	$ 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]
Amount	$ 9	$ 84
% of Total Loans	0.00%	0.10%
Non-Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 736	$ 233
% of Total Loans	0.30%	0.10%
Non-Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 27	$ 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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