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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 15,736,144 | $ 14,004,870
% based on $, past due | 0.26% | 0.19%
Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 15,695,446 | $ 13,977,902
% based on $, current | 99.74% | 99.81%
Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 40,698 | $ 26,968
% based on $, past due | 0.26% | 0.19%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 5,419 | $ 4,802
% based on $, past due | 0.03% | 0.03%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,971 | $ 2,595
% based on $, past due | 0.01% | 0.02%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 33,308 | $ 19,571
% based on $, past due | 0.21% | 0.14%
90 Days Delinquent | SBA Payroll Protection Program, CARES Act |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 10,000 |
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 9,330,158 | $ 8,316,591
% based on $, past due | 0.18% | 0.05%
Commercial loans | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 9,313,386 | $ 8,312,095
Commercial loans | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 16,772 | 4,496
Commercial loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 369 | 971
Commercial loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 359 | 64
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 16,044 | 3,461
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,478,932 | $ 2,273,689
% based on $, past due | 0.00% | 0.02%
Commercial loans | Multi-family | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,478,932 | $ 2,273,214
Commercial loans | Multi-family | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 475
Commercial loans | Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 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 | 0 | 475
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,876,995 | $ 2,429,332
% based on $, past due | 0.01% | 0.05%
Commercial loans | Commercial real estate | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,876,644 | $ 2,428,014
Commercial loans | Commercial real estate | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 351 | 1,318
Commercial loans | Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 971
Commercial loans | Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 64
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 351 | 283
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,344,046 | $ 2,303,927
% based on $, past due | 0.70% | 0.01%
Commercial loans | Commercial & industrial | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 2,327,625 | $ 2,303,605
Commercial loans | Commercial & industrial | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 16,421 | 322
Commercial loans | Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 369 | 0
Commercial loans | Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 359 | 0
Commercial loans | Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 15,693 | 322
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,407,211 | $ 1,117,227
% based on $, past due | 0.00% | 0.00%
Commercial loans | Construction | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 1,407,211 | $ 1,117,186
Commercial loans | Construction | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 41
Commercial loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 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 | 41
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 222,974 | $ 192,416
% based on $, past due | 0.00% | 1.22%
Commercial loans | Land - acquisition & development | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 222,974 | $ 190,076
Commercial loans | Land - acquisition & development | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 2,340
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 | 0 | 2,340
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 6,405,986 | $ 5,688,279
% based on $, past due | 0.37% | 0.40%
Consumer loans | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 6,382,060 | $ 5,665,807
Consumer loans | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 23,926 | 22,472
Consumer loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 5,050 | 3,831
Consumer loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 1,612 | 2,531
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 17,264 | 16,110
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 368,839 | $ 347,752
% based on $, past due | 0.24% | 0.00%
Consumer loans | Construction | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 367,939 | $ 347,752
Consumer loans | Construction | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 900 | 0
Consumer loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 0
Consumer loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 0
Consumer loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 900 | 0
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 5,619,448 | $ 4,937,064
% based on $, past due | 0.39% | 0.43%
Consumer loans | Single-family residential | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 5,597,259 | $ 4,915,749
Consumer loans | Single-family residential | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 22,189 | 21,315
Consumer loans | Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 4,611 | 3,627
Consumer loans | Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 1,533 | 2,165
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 16,045 | 15,523
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 157,076 | $ 148,534
% based on $, past due | 0.24% | 0.39%
Consumer loans | Land - consumer lot loans | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 156,693 | $ 147,952
Consumer loans | Land - consumer lot loans | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 383 | 582
Consumer loans | Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 206 | 5
Consumer loans | Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 0 | 307
Consumer loans | Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 177 | 270
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 187,469 | $ 166,940
% based on $, past due | 0.11% | 0.19%
Consumer loans | HELOC | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 187,267 | $ 166,627
Consumer loans | HELOC | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 202 | 313
Consumer loans | HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 103 | 47
Consumer loans | HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 16 | 0
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 83 | 266
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 73,154 | $ 87,989
% based on $, past due | 0.34% | 0.30%
Consumer loans | Consumer | Financial Asset, Not Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 72,902 | $ 87,727
Consumer loans | Consumer | Financial Asset, Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 252 | 262
Consumer loans | Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 130 | 152
Consumer loans | Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 63 | 59
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 59 | $ 51

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