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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 17,653,757 | $ 16,286,372
% based on $, past due | 0.36% | 0.17%
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 17,590,442 | $ 16,259,445
Delinquency %, current | 99.64% | 99.83%
Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 63,315 | $ 26,927
% based on $, past due | 0.36% | 0.17%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 9,715 | $ 3,651
% based on $, past due | 0.06% | 0.02%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 11,682 | $ 2,887
% based on $, past due | 0.07% | 0.02%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 41,918 | $ 20,389
% based on $, past due | 0.24% | 0.13%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 10,507,610 | $ 9,728,501
% based on $, past due | 0.31% | 0.08%
Commercial loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 10,474,752 | $ 9,720,833
Commercial loans | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 32,858 | 7,668
Commercial loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 878 | 538
Commercial loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 2,331 | 1,369
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 29,649 | 5,761
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 2,886,594 | $ 2,626,479
% based on $, past due | 0.00% | 0.00%
Commercial loans | Multi-family | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 2,886,462 | $ 2,626,479
Commercial loans | Multi-family | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 132 | 0
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 | 132 | 0
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 3,310,101 | $ 3,111,112
% based on $, past due | 0.74% | 0.03%
Commercial loans | Commercial real estate | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 3,285,673 | $ 3,110,056
Commercial loans | Commercial real estate | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 24,428 | 1,056
Commercial loans | Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 848 | 538
Commercial loans | Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 145 | 450
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 23,435 | 68
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 2,315,318 | $ 2,343,403
% based on $, past due | 0.36% | 0.28%
Commercial loans | Commercial & industrial | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 2,307,020 | $ 2,336,791
Commercial loans | Commercial & industrial | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 8,298 | 6,612
Commercial loans | Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 30 | 0
Commercial loans | Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 2,186 | 919
Commercial loans | Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 6,082 | 5,693
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 1,838,936 | $ 1,423,891
% 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 | $ 1,838,936 | $ 1,423,891
Commercial loans | Construction | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 0 | 0
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 | 0 |
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 156,661 | $ 223,616
% based on $, past due | 0.00% | 0.00%
Commercial loans | Land - acquisition & development | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 156,661 | $ 223,616
Commercial loans | Land - acquisition & development | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 0 | 0
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 | 0
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 7,146,147 | $ 6,557,871
% based on $, past due | 0.43% | 0.29%
Consumer loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 7,115,690 | $ 6,538,612
Consumer loans | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 30,457 | 19,259
Consumer loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 8,837 | 3,113
Consumer loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 9,351 | 1,518
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 12,269 | 14,628
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 324,451 | $ 397,343
% based on $, past due | 1.07% | 0.11%
Consumer loans | Construction | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 320,987 | $ 396,908
Consumer loans | Construction | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 3,464 | 435
Consumer loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 760 | 0
Consumer loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 2,617 | 0
Consumer loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 87 | 435
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 6,388,990 | $ 5,726,979
% based on $, past due | 0.37% | 0.31%
Consumer loans | Single-family residential | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 6,365,065 | $ 5,708,996
Consumer loans | Single-family residential | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 23,925 | 17,983
Consumer loans | Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 6,441 | 2,796
Consumer loans | Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 6,068 | 1,316
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 11,416 | 13,871
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 124,842 | $ 151,945
% based on $, past due | 0.49% | 0.13%
Consumer loans | Land - consumer lot loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 124,231 | $ 151,746
Consumer loans | Land - consumer lot loans | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 611 | 199
Consumer loans | Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 358 | 0
Consumer loans | Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 245 | 139
Consumer loans | Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 8 | 60
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 237,754 | $ 206,033
% based on $, past due | 0.86% | 0.21%
Consumer loans | HELOC | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 235,708 | $ 205,605
Consumer loans | HELOC | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 2,046 | 428
Consumer loans | HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,050 | 155
Consumer loans | HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 314 | 46
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 682 | 227
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 70,110 | $ 75,571
% based on $, past due | 0.59% | 0.28%
Consumer loans | Consumer | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 69,699 | $ 75,357
Consumer loans | Consumer | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 411 | 214
Consumer loans | Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 228 | 162
Consumer loans | Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 107 | 17
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 76 | $ 35

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