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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
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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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