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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | $ 12,077,615 | $ 11,658,172
Current | 12,029,102 | 11,608,959
Total Delinquent | $ 48,513 | $ 49,213
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.40% | 0.42%
Ratio of total past due loans to total loans receivable, current | 99.60% | 99.58%
Ratio of total past due loans to total loans receivable, past due | 0.40% | 0.42%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 13,636 | $ 9,182
Ratio of total past due loans to total loans receivable, past due | 0.11% | 0.08%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 3,393 | $ 6,513
Ratio of total past due loans to total loans receivable, past due | 0.03% | 0.06%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 31,484 | $ 33,518
Ratio of total past due loans to total loans receivable, past due | 0.26% | 0.29%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | $ 5,860,365 | $ 5,798,353
Current | 5,830,848 | 5,768,253
Total Delinquent | $ 29,517 | $ 30,100
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.50% | 0.52%
Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 10,018 | $ 7,983
Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 2,672 | 3,562
Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 16,827 | 18,555
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,139,970 | 1,062,855
Current | 1,138,688 | 1,060,428
Total Delinquent | $ 1,282 | $ 2,427
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.11% | 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 | 1,282 | 2,427
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 307,405 | 289,192
Current | 306,929 | 289,192
Total Delinquent | $ 476 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.15% | 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 | 476 | 0
Construction - custom | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 0
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 152,546 | 123,560
Current | 152,394 | 122,620
Total Delinquent | $ 152 | $ 940
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.10% | 0.76%
Land - acquisition & development | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 152 | $ 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 | 97,033 | 101,908
Current | 96,278 | 101,294
Total Delinquent | $ 755 | $ 614
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.78% | 0.60%
Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 502 | $ 144
Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 117
Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 253 | 353
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,423,701 | 1,385,103
Current | 1,422,270 | 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 | $ 1,431 | $ 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 | 0 | 0
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,570,502 | 1,452,169
Current | 1,566,393 | 1,448,946
Total Delinquent | $ 4,109 | $ 3,223
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.26% | 0.22%
Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 743 | $ 316
Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 1,767
Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 3,366 | 1,140
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,230,888 | 1,140,874
Current | 1,221,571 | 1,130,836
Total Delinquent | $ 9,317 | $ 10,038
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.76% | 0.88%
Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 311 | $ 0
Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 0
Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 9,006 | 10,038
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 139,203 | 130,852
Current | 137,982 | 129,510
Total Delinquent | $ 1,221 | $ 1,342
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.88% | 1.03%
HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 388 | $ 567
HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 229 | 469
HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 604 | 306
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 156,002 | 173,306
Current | 155,749 | 172,777
Total Delinquent | $ 253 | $ 529
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.16% | 0.31%
Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 91 | $ 172
Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 16 | 328
Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 146 | $ 29

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