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Allowance for Loan Losses - Gross Loans by Payment Activity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 17,653,757 | $ 16,286,372
Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 10,507,610 | 9,728,501
Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,886,594 | 2,626,479
Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 3,310,101 | 3,111,112
Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,315,318 | 2,343,403
Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 1,838,936 | 1,423,891
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 156,661 | 223,616
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 7,146,147 | 6,557,871
Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 324,451 | 397,343
Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 6,388,990 | 5,726,979
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 124,842 | 151,945
Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 237,754 | 206,033
Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 70,110 | 75,571
Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 17,603,335 | $ 16,251,838
% of Total Loans | 99.70% | 99.80%
Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 10,472,966 | $ 9,712,205
% of Total Loans | 99.70% | 99.80%
Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,881,467 | $ 2,620,567
% of Total Loans | 99.80% | 99.80%
Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 3,286,666 | $ 3,106,421
% of Total Loans | 99.30% | 99.80%
Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,309,236 | $ 2,337,710
% of Total Loans | 99.70% | 99.80%
Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 1,838,936 | $ 1,423,891
% of Total Loans | 100.00% | 100.00%
Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 156,661 | $ 223,616
% of Total Loans | 100.00% | 100.00%
Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 7,130,369 | $ 6,539,633
% of Total Loans | 99.80% | 99.70%
Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 324,363 | $ 396,908
% of Total Loans | 100.00% | 99.90%
Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 6,374,072 | $ 5,709,529
% of Total Loans | 99.80% | 99.70%
Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 124,833 | $ 151,861
% of Total Loans | 100.00% | 99.90%
Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 237,018 | $ 205,800
% of Total Loans | 99.70% | 99.90%
Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 70,083 | $ 75,535
% of Total Loans | 100.00% | 100.00%
Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 50,422 | $ 34,534
% of Total Loans | 0.30% | 0.20%
Non-Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 34,644 | $ 16,296
% of Total Loans | 0.30% | 0.20%
Non-Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 5,127 | $ 5,912
% of Total Loans | 0.20% | 0.20%
Non-Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 23,435 | $ 4,691
% of Total Loans | 0.70% | 0.20%
Non-Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 6,082 | $ 5,693
% of Total Loans | 0.30% | 0.20%
Non-Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 0 | $ 0
% of Total Loans | 0.00% | 0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 0 | $ 0
% of Total Loans | 0.00% | 0.00%
Non-Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 15,778 | $ 18,238
% of Total Loans | 0.20% | 0.30%
Non-Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 88 | $ 435
% of Total Loans | 0.00% | 0.10%
Non-Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 14,918 | $ 17,450
% of Total Loans | 0.20% | 0.30%
Non-Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 9 | $ 84
% of Total Loans | 0.00% | 0.10%
Non-Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 736 | $ 233
% of Total Loans | 0.30% | 0.10%
Non-Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 27 | $ 36
% of Total Loans | 0.00% | 0.00%

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