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Allowance for Loan Losses - Gross Loans by Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 21,120,107	$ 17,653,757
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	12,205,420	10,507,610
Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	4,556,200	2,886,594
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	3,732,155	3,310,101
Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,332,732	2,315,318
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	1,424,016	1,838,936
Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	160,317	156,661
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	8,914,687	7,146,147
Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	182,415	324,451
Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	8,280,300	6,388,990
Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	108,060	124,842
Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	269,857	237,754
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	74,055	70,110
Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 21,050,566	$ 17,603,335
% of Total Loans	99.70%	99.70%
Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 12,159,121	$ 10,472,966
% of Total Loans	99.60%	99.70%
Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 4,537,457	$ 2,881,467
% of Total Loans	99.60%	99.80%
Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 3,705,793	$ 3,286,666
% of Total Loans	99.30%	99.30%
Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,332,732	$ 2,309,236
% of Total Loans	100.00%	99.70%
Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 1,422,896	$ 1,838,936
% of Total Loans	99.90%	100.00%
Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 160,243	$ 156,661
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,891,445	$ 7,130,369
% of Total Loans	99.70%	99.80%
Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 181,567	$ 324,363
% of Total Loans	99.50%	100.00%
Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,258,812	$ 6,374,072
% of Total Loans	99.70%	99.80%
Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 108,060	$ 124,833
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 269,261	$ 237,018
% of Total Loans	99.80%	99.70%
Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 73,745	$ 70,083
% of Total Loans	99.60%	100.00%
Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 69,541	$ 50,422
% of Total Loans	0.30%	0.30%
Non-Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 46,299	$ 34,644
% of Total Loans	0.40%	0.30%
Non-Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 18,743	$ 5,127
% of Total Loans	0.40%	0.20%
Non-Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 26,362	$ 23,435
% of Total Loans	0.70%	0.70%
Non-Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 6,082
% of Total Loans	0.00%	0.30%
Non-Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 1,120	$ 0
% of Total Loans	0.10%	0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 74	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 23,242	$ 15,778
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 848	$ 88
% of Total Loans	0.50%	0.00%
Non-Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 21,488	$ 14,918
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 9
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 596	$ 736
% of Total Loans	0.20%	0.30%
Non-Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 310	$ 27
% of Total Loans	0.40%	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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