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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 16,286,372	$ 14,004,870
% based on $, past due	0.17%	0.19%
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 16,259,445	$ 13,977,902
Delinquency %, current	99.83%	99.81%
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 26,927	$ 26,968
% based on $, past due	0.17%	0.19%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 3,651	$ 4,802
% based on $, past due	0.02%	0.03%
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,887	$ 2,595
% based on $, past due	0.02%	0.02%
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 20,389	$ 19,571
% based on $, past due	0.13%	0.14%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 9,728,501	$ 8,316,591
% based on $, past due	0.08%	0.05%
Commercial loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 9,720,833	$ 8,312,095
Commercial loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	7,668	4,496
Commercial loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	538	971
Commercial loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,369	64
Commercial loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	5,761	3,461
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,626,479	$ 2,273,689
% based on $, past due	0.00%	0.02%
Commercial loans | Multi-family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,626,479	$ 2,273,214
Commercial loans | Multi-family | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	475
Commercial loans | Multi-family | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Multi-family | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	475
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 3,111,112	$ 2,429,332
% based on $, past due	0.03%	0.05%
Commercial loans | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 3,110,056	$ 2,428,014
Commercial loans | Commercial real estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,056	1,318
Commercial loans | Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	538	971
Commercial loans | Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	450	64
Commercial loans | Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	68	283
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,343,403	$ 2,303,927
% based on $, past due	0.28%	0.01%
Commercial loans | Commercial & industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 2,336,791	$ 2,303,605
Commercial loans | Commercial & industrial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	6,612	322
Commercial loans | Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	919	0
Commercial loans | Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	5,693	322
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 1,423,891	$ 1,117,227
% based on $, past due	0.00%	0.00%
Commercial loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 1,423,891	$ 1,117,186
Commercial loans | Construction | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	41
Commercial loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process		41
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 223,616	$ 192,416
% based on $, past due	0.00%	1.22%
Commercial loans | Land - acquisition & development | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 223,616	$ 190,076
Commercial loans | Land - acquisition & development | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	2,340
Commercial loans | Land - acquisition & development | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Land - acquisition & development | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Commercial loans | Land - acquisition & development | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	2,340
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 6,557,871	$ 5,688,279
% based on $, past due	0.29%	0.40%
Consumer loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 6,538,612	$ 5,665,807
Consumer loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	19,259	22,472
Consumer loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	3,113	3,831
Consumer loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,518	2,531
Consumer loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	14,628	16,110
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 397,343	$ 347,752
% based on $, past due	0.11%	0.00%
Consumer loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 396,908	$ 347,752
Consumer loans | Construction | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	435	0
Consumer loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Consumer loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	0
Consumer loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	435	0
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 5,726,979	$ 4,937,064
% based on $, past due	0.31%	0.43%
Consumer loans | Single-family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 5,708,996	$ 4,915,749
Consumer loans | Single-family residential | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	17,983	21,315
Consumer loans | Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	2,796	3,627
Consumer loans | Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	1,316	2,165
Consumer loans | Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	13,871	15,523
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 151,945	$ 148,534
% based on $, past due	0.13%	0.39%
Consumer loans | Land - consumer lot loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 151,746	$ 147,952
Consumer loans | Land - consumer lot loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	199	582
Consumer loans | Land - consumer lot loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	0	5
Consumer loans | Land - consumer lot loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	139	307
Consumer loans | Land - consumer lot loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	60	270
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 206,033	$ 166,940
% based on $, past due	0.21%	0.19%
Consumer loans | HELOC | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 205,605	$ 166,627
Consumer loans | HELOC | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	428	313
Consumer loans | HELOC | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	155	47
Consumer loans | HELOC | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	46	0
Consumer loans | HELOC | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	227	266
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 75,571	$ 87,989
% based on $, past due	0.28%	0.30%
Consumer loans | Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 75,357	$ 87,727
Consumer loans | Consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	214	262
Consumer loans | Consumer | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	162	152
Consumer loans | Consumer | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	17	59
Consumer loans | Consumer | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of loans in process	$ 35	$ 51

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