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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 12,144,837 | $ 12,111,047
Days delinquent, current | 12,105,192 | 12,075,677
Days delinquent, past due | $ 39,645 | $ 35,370
% based on $ | 0.33% | 0.29%
% based on $, current | 99.67% | 99.71%
% based on $, past due | 0.33% | 0.29%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 9,267 | $ 6,273
% based on $, past due | 0.08% | 0.05%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 4,664 | $ 4,415
% based on $, past due | 0.04% | 0.04%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 25,714 | $ 24,682
% based on $, past due | 0.21% | 0.20%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 5,582,243 | $ 5,835,186
Days delinquent, current | 5,556,051 | 5,809,239
Days delinquent, past due | $ 26,192 | $ 25,947
% based on $ | 0.47% | 0.44%
Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 5,154 | $ 3,672
Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 3,857 | 3,211
Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 17,181 | 19,064
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,235,731 | 1,164,889
Days delinquent, current | 1,232,378 | 1,164,889
Days delinquent, past due | $ 3,353 | $ 0
% based on $ | 0.27% | 0.00%
Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 3,353 | 0
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 270,880 | 255,505
Days delinquent, current | 270,880 | 255,505
Days delinquent, past due | $ 0 | $ 0
% based on $ | 0.00% | 0.00%
Construction - custom | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Construction - custom | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Construction - custom | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 152,623 | 161,194
Days delinquent, current | 152,229 | 161,194
Days delinquent, past due | $ 394 | $ 0
% based on $ | 0.26% | 0.00%
Land - acquisition & development | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 394 | $ 0
Land - acquisition & development | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Land - acquisition & development | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 96,580 | 99,694
Days delinquent, current | 95,796 | 98,916
Days delinquent, past due | $ 784 | $ 778
% based on $ | 0.81% | 0.78%
Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 141 | $ 112
Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 270 | 619
Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 373 | 47
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,467,208 | 1,422,652
Days delinquent, current | 1,466,852 | 1,422,652
Days delinquent, past due | $ 356 | $ 0
% based on $ | 0.02% | 0.00%
Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 356 | $ 0
Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,717,535 | 1,631,171
Days delinquent, current | 1,712,893 | 1,625,509
Days delinquent, past due | $ 4,642 | $ 5,662
% based on $ | 0.27% | 0.35%
Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 580 | $ 1,614
Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 414 | 285
Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 3,648 | 3,763
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,371,128 | 1,268,695
Days delinquent, current | 1,368,840 | 1,267,828
Days delinquent, past due | $ 2,288 | $ 867
% based on $ | 0.17% | 0.07%
Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 2,215 | $ 0
Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 73 | 867
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 145,761 | 142,178
Days delinquent, current | 144,709 | 140,718
Days delinquent, past due | $ 1,052 | $ 1,460
% based on $ | 0.72% | 1.03%
HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 151 | $ 580
HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 37 | 183
HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 864 | 697
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 105,148 | 129,883
Days delinquent, current | 104,564 | 129,227
Days delinquent, past due | $ 584 | $ 656
% based on $ | 0.56% | 0.51%
Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 276 | $ 295
Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 86 | 117
Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 222 | $ 244

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