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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 20,996,836	$ 17,653,757
% based on $, past due	0.36%	0.36%
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 20,920,788	$ 17,590,442
% based on $, current	99.64%	99.64%
Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 76,048	$ 63,315
% based on $, past due	0.36%	0.36%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 23,645	$ 9,715
% based on $, past due	0.11%	0.06%
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,033	$ 11,682
% based on $, past due	0.01%	0.07%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 48,370	$ 41,918
% based on $, past due	0.23%	0.24%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 11,717,725	$ 10,507,610
% based on $, past due	0.41%	0.31%
Commercial loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 11,670,036	$ 10,474,752
Commercial loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	47,689	32,858
Commercial loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	15,769	878
Commercial loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	2,331
Commercial loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	31,920	29,649
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,089,719	$ 2,886,594
% based on $, past due	0.43%	0.00%
Commercial loans | Multi-family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 4,072,075	$ 2,886,462
Commercial loans | Multi-family | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	17,644	132
Commercial loans | Multi-family | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	14,869	0
Commercial loans | Multi-family | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,775	132
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,544,884	$ 3,310,101
% based on $, past due	0.69%	0.74%
Commercial loans | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,520,286	$ 3,285,673
Commercial loans | Commercial real estate | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	24,598	24,428
Commercial loans | Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	848
Commercial loans | Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	145
Commercial loans | Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	24,598	23,435
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,283,922	$ 2,315,318
% based on $, past due	0.20%	0.36%
Commercial loans | Commercial & industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,279,347	$ 2,307,020
Commercial loans | Commercial & industrial | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	4,575	8,298
Commercial loans | Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	140	30
Commercial loans | Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	2,186
Commercial loans | Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	4,435	6,082
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,623,496	$ 1,838,936
% based on $, past due	0.05%	0.00%
Commercial loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,622,736	$ 1,838,936
Commercial loans | Construction | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	760	0
Commercial loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	760	0
Commercial loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 175,704	$ 156,661
% based on $, past due	0.06%	0.00%
Commercial loans | Land - acquisition & development | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 175,592	$ 156,661
Commercial loans | Land - acquisition & development | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	112	0
Commercial loans | Land - acquisition & development | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Land - acquisition & development | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Commercial loans | Land - acquisition & development | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	112	0
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 9,279,111	$ 7,146,147
% based on $, past due	0.31%	0.43%
Consumer loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 9,250,752	$ 7,115,690
Consumer loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	28,359	30,457
Consumer loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	7,876	8,837
Consumer loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	4,033	9,351
Consumer loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	16,450	12,269
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 223,377	$ 324,451
% based on $, past due	0.38%	1.07%
Consumer loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 222,530	$ 320,987
Consumer loans | Construction | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	847	3,464
Consumer loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	760	760
Consumer loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	2,617
Consumer loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	87	87
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,619,916	$ 6,388,990
% based on $, past due	0.30%	0.37%
Consumer loans | Single-family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 8,594,155	$ 6,365,065
Consumer loans | Single-family residential | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	25,761	23,925
Consumer loans | Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	6,274	6,441
Consumer loans | Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,828	6,068
Consumer loans | Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	15,659	11,416
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 114,256	$ 124,842
% based on $, past due	0.27%	0.49%
Consumer loans | Land - consumer lot loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 113,949	$ 124,231
Consumer loans | Land - consumer lot loans | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	307	611
Consumer loans | Land - consumer lot loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	307	358
Consumer loans | Land - consumer lot loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	245
Consumer loans | Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	8
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 247,305	$ 237,754
% based on $, past due	0.41%	0.86%
Consumer loans | HELOC | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 246,296	$ 235,708
Consumer loans | HELOC | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,009	2,046
Consumer loans | HELOC | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	483	1,050
Consumer loans | HELOC | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	86	314
Consumer loans | HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	440	682
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 74,257	$ 70,110
% based on $, past due	0.59%	0.59%
Consumer loans | Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 73,822	$ 69,699
Consumer loans | Consumer | Total Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	435	411
Consumer loans | Consumer | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	52	228
Consumer loans | Consumer | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	119	107
Consumer loans | Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 264	$ 76

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