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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | $ 12,155,867 | $ 11,658,172
Current | 12,113,208 | 11,608,959
Total Delinquent | $ 42,659 | $ 49,213
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.35% | 0.42%
Ratio of total past due loans to total loans receivable, current | 99.65% | 99.58%
Ratio of total past due loans to total loans receivable, past due | 0.35% | 0.42%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 8,350 | $ 9,182
Ratio of total past due loans to total loans receivable, past due | 0.07% | 0.08%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 8,536 | $ 6,513
Ratio of total past due loans to total loans receivable, past due | 0.07% | 0.06%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 25,773 | $ 33,518
Ratio of total past due loans to total loans receivable, past due | 0.21% | 0.29%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | $ 5,872,750 | $ 5,798,353
Current | 5,846,159 | 5,768,253
Total Delinquent | $ 26,591 | $ 30,100
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.45% | 0.52%
Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 6,290 | $ 7,983
Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 5,081 | 3,562
Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 15,220 | 18,555
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,168,667 | 1,062,855
Current | 1,168,667 | 1,060,428
Total Delinquent | $ 0 | $ 2,427
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.00% | 0.23%
Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 0 | $ 0
Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 0
Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 2,427
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 294,224 | 289,192
Current | 293,063 | 289,192
Total Delinquent | $ 1,161 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.39% | 0.00%
Construction - custom | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 0 | $ 0
Construction - custom | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 0
Construction - custom | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 1,161 | 0
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 160,383 | 123,560
Current | 160,383 | 122,620
Total Delinquent | $ 0 | $ 940
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.00% | 0.76%
Land - acquisition & development | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 0 | $ 0
Land - acquisition & development | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 270
Land - acquisition & development | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 670
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 95,150 | 101,908
Current | 93,829 | 101,294
Total Delinquent | $ 1,321 | $ 614
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.39% | 0.60%
Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 813 | $ 144
Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 173 | 117
Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 335 | 353
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,403,120 | 1,385,103
Current | 1,401,689 | 1,385,103
Total Delinquent | $ 1,431 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.10% | 0.00%
Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 0 | $ 0
Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 0
Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 1,431 | 0
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,622,944 | 1,452,169
Current | 1,618,544 | 1,448,946
Total Delinquent | $ 4,400 | $ 3,223
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.27% | 0.22%
Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 289 | $ 316
Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 1,535 | 1,767
Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 2,576 | 1,140
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,256,398 | 1,140,874
Current | 1,250,654 | 1,130,836
Total Delinquent | $ 5,744 | $ 10,038
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.46% | 0.88%
Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 86 | $ 0
Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 1,326 | 0
Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 4,332 | 10,038
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 139,914 | 130,852
Current | 138,400 | 129,510
Total Delinquent | $ 1,514 | $ 1,342
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.08% | 1.03%
HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 743 | $ 567
HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 183 | 469
HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 588 | 306
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 142,317 | 173,306
Current | 141,820 | 172,777
Total Delinquent | $ 497 | $ 529
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.35% | 0.31%
Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 129 | $ 172
Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 238 | 328
Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 130 | $ 29

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