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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | $ 13,208,075 | $ 12,959,272
Days delinquent, current | 13,169,902 | 12,928,463
Days delinquent, past due | $ 38,173 | $ 30,809
% based on $, current | 99.71% | 99.76%
% based on $, past due | 0.29% | 0.24%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 7,465 | $ 4,470
% based on $, past due | 0.06% | 0.03%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 1,733 | $ 3,973
% based on $, past due | 0.01% | 0.03%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 28,975 | $ 22,366
% based on $, past due | 0.22% | 0.17%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | $ 7,726,098 | $ 7,044,426
Days delinquent, current | 7,715,200 | 7,041,423
Days delinquent, past due | $ 10,898 | $ 3,003
% based on $, past due | 0.14% | 0.04%
Commercial loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 1,212 | $ 0
Commercial loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 586 | 778
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 9,100 | 2,225
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 1,987,120 | 1,538,240
Days delinquent, current | 1,986,645 | 1,538,240
Days delinquent, past due | $ 475 | $ 0
% based on $, past due | 0.02% | 0.00%
Commercial loans | Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Commercial loans | Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 475 | 0
Commercial loans | Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 2,211,065 | 1,884,688
Days delinquent, current | 2,206,097 | 1,884,210
Days delinquent, past due | $ 4,968 | $ 478
% based on $, past due | 0.22% | 0.03%
Commercial loans | Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 37 | $ 0
Commercial loans | Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 111 | 195
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 4,820 | 283
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 2,452,585 | 2,115,513
Days delinquent, current | 2,450,623 | 2,114,650
Days delinquent, past due | $ 1,962 | $ 863
% based on $, past due | 0.08% | 0.04%
Commercial loans | Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 1,175 | $ 0
Commercial loans | Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 583
Commercial loans | Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 787 | 280
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 925,017 | 1,352,414
Days delinquent, current | 923,864 | 1,350,752
Days delinquent, past due | $ 1,153 | $ 1,662
% based on $, past due | 0.12% | 0.12%
Commercial loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Commercial loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 1,153 | 1,662
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 150,311 | 153,571
Days delinquent, current | 147,971 | 153,571
Days delinquent, past due | $ 2,340 | $ 0
% based on $, past due | 1.56% | 0.00%
Commercial loans | Land - acquisition & development | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Commercial loans | Land - acquisition & development | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial loans | Land - acquisition & development | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 2,340 | 0
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 5,481,977 | 5,914,846
Days delinquent, current | 5,454,702 | 5,887,040
Days delinquent, past due | $ 27,275 | $ 27,806
% based on $, past due | 0.50% | 0.47%
Consumer loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 6,253 | $ 4,470
Consumer loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 1,147 | 3,195
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 19,875 | 20,141
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 308,831 | 295,953
Days delinquent, current | 308,831 | 295,953
Days delinquent, past due | $ 0 | $ 0
% based on $, past due | 0.00% | 0.00%
Consumer loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Consumer loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Consumer loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 4,802,575 | 5,293,962
Days delinquent, current | 4,776,367 | 5,267,608
Days delinquent, past due | $ 26,208 | $ 26,354
% based on $, past due | 0.55% | 0.50%
Consumer loans | Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 5,868 | $ 3,922
Consumer loans | Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 960 | 3,108
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 19,380 | 19,324
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 122,211 | 101,394
Days delinquent, current | 121,858 | 101,029
Days delinquent, past due | $ 353 | $ 365
% based on $, past due | 0.29% | 0.36%
Consumer loans | Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 93 | $ 152
Consumer loans | Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 185 | 0
Consumer loans | Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 75 | 213
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 145,066 | 140,222
Days delinquent, current | 144,667 | 139,491
Days delinquent, past due | $ 399 | $ 731
% based on $, past due | 0.28% | 0.52%
Consumer loans | HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 118 | $ 275
Consumer loans | HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 76
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 281 | 380
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 103,294 | 83,315
Days delinquent, current | 102,979 | 82,959
Days delinquent, past due | $ 315 | $ 356
% based on $, past due | 0.30% | 0.43%
Consumer loans | Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 174 | $ 121
Consumer loans | Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 2 | 11
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 139 | $ 224

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