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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | $ 11,882,160 | $ 11,658,172
Current | 11,832,581 | 11,608,959
Total Delinquent | $ 49,579 | $ 49,213
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.42% | 0.42%
Ratio of total past due loans to total loans receivable, current | 99.58% | 99.58%
Ratio of total past due loans to total loans receivable, past due | 0.42% | 0.42%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 9,403 | $ 9,182
Ratio of total past due loans to total loans receivable, past due | 0.08% | 0.08%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 9,540 | $ 6,513
Ratio of total past due loans to total loans receivable, past due | 0.08% | 0.06%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 30,636 | $ 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 | $ 5,844,383 | $ 5,798,353
Current | 5,817,233 | 5,768,253
Total Delinquent | $ 27,150 | $ 30,100
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.46% | 0.52%
Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 5,857 | $ 7,983
Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 5,019 | 3,562
Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 16,274 | 18,555
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,047,229 | 1,062,855
Current | 1,045,849 | 1,060,428
Total Delinquent | $ 1,380 | $ 2,427
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.13% | 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 | 1,380 | 2,427
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 299,622 | 289,192
Current | 299,622 | 289,192
Total Delinquent | $ 0 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.00% | 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 | 0 | 0
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 145,635 | 123,560
Current | 145,443 | 122,620
Total Delinquent | $ 192 | $ 940
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.13% | 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 | 192 | 670
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 100,440 | 101,908
Current | 99,957 | 101,294
Total Delinquent | $ 483 | $ 614
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.48% | 0.60%
Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 0 | $ 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 | 483 | 353
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,405,149 | 1,385,103
Current | 1,403,524 | 1,385,103
Total Delinquent | $ 1,625 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.12% | 0.00%
Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 974 | $ 0
Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 651 | 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 | 1,526,887 | 1,452,169
Current | 1,520,083 | 1,448,946
Total Delinquent | $ 6,804 | $ 3,223
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.45% | 0.22%
Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 1,757 | $ 316
Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 2,942 | 1,767
Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 2,105 | 1,140
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,213,738 | 1,140,874
Current | 1,203,436 | 1,130,836
Total Delinquent | $ 10,302 | $ 10,038
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.85% | 0.88%
Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 283 | $ 0
Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 234 | 0
Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 9,785 | 10,038
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 136,856 | 130,852
Current | 135,488 | 129,510
Total Delinquent | $ 1,368 | $ 1,342
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.00% | 1.03%
HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 411 | $ 567
HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 569 | 469
HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 388 | 306
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 162,221 | 173,306
Current | 161,946 | 172,777
Total Delinquent | $ 275 | $ 529
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.17% | 0.31%
Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 121 | $ 172
Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 125 | 328
Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 29 | $ 29

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