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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 12,898,775 | $ 12,111,047
Days delinquent, current | 12,857,170 | 12,075,677
Days delinquent, past due | $ 41,605 | $ 35,370
% based on $, current | 99.68% | 99.71%
% based on $, past due | 0.32% | 0.29%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 4,773 | $ 6,273
% based on $, past due | 0.04% | 0.05%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 10,776 | $ 4,415
% based on $, past due | 0.08% | 0.04%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 26,056 | $ 24,682
% based on $, past due | 0.20% | 0.20%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 6,836,049 | $ 5,648,601
Days delinquent, current | 6,825,470 | 5,642,072
Days delinquent, past due | $ 10,579 | $ 6,529
% based on $, past due | 0.15% | 0.12%
Commercial loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 177 | $ 1,614
Commercial loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 5,196 | 285
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 5,206 | 4,630
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,509,837 | 1,422,652
Days delinquent, current | 1,509,613 | 1,422,652
Days delinquent, past due | $ 224 | $ 0
% based on $, past due | 0.01% | 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 | 0 | 0
Commercial loans | Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 224 | 0
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,700,568 | 1,631,171
Days delinquent, current | 1,697,302 | 1,625,509
Days delinquent, past due | $ 3,266 | $ 5,662
% based on $, past due | 0.19% | 0.35%
Commercial loans | Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 177 | $ 1,614
Commercial loans | Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 1,938 | 285
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 1,151 | 3,763
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 2,138,462 | 1,268,695
Days delinquent, current | 2,134,726 | 1,267,828
Days delinquent, past due | $ 3,736 | $ 867
% based on $, past due | 0.17% | 0.07%
Commercial loans | Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Commercial loans | Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 3,258 | 0
Commercial loans | Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 478 | 867
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,334,948 | 1,164,889
Days delinquent, current | 1,331,595 | 1,164,889
Days delinquent, past due | $ 3,353 | $ 0
% based on $, past due | 0.25% | 0.00%
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 | 3,353 | 0
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 152,234 | 161,194
Days delinquent, current | 152,234 | 161,194
Days delinquent, past due | $ 0 | $ 0
% based on $, past due | 0.00% | 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 | 0 | 0
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 6,062,726 | 6,462,446
Days delinquent, current | 6,031,700 | 6,433,605
Days delinquent, past due | $ 31,026 | $ 28,841
% based on $, past due | 0.51% | 0.45%
Consumer loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 4,596 | $ 4,659
Consumer loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 5,580 | 4,130
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 20,850 | 20,052
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 278,182 | 255,505
Days delinquent, current | 278,182 | 255,505
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, net of loans in process | 5,452,424 | 5,835,186
Days delinquent, current | 5,423,302 | 5,809,239
Days delinquent, past due | $ 29,122 | $ 25,947
% based on $, past due | 0.53% | 0.44%
Consumer loans | Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 3,971 | $ 3,672
Consumer loans | Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 5,418 | 3,211
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 19,733 | 19,064
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 99,255 | 99,694
Days delinquent, current | 98,773 | 98,916
Days delinquent, past due | $ 482 | $ 778
% based on $, past due | 0.49% | 0.78%
Consumer loans | Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 136 | $ 112
Consumer loans | Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 103 | 619
Consumer loans | Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 243 | 47
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 141,165 | 142,178
Days delinquent, current | 140,445 | 140,718
Days delinquent, past due | $ 720 | $ 1,460
% based on $, past due | 0.51% | 1.03%
Consumer loans | HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 14 | $ 580
Consumer loans | HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 17 | 183
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 689 | 697
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 91,700 | 129,883
Days delinquent, current | 90,998 | 129,227
Days delinquent, past due | $ 702 | $ 656
% based on $, past due | 0.77% | 0.51%
Consumer loans | Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 475 | $ 295
Consumer loans | Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 42 | 117
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 185 | $ 244

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