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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 11,399,236 | $ 11,051,453
Current | 11,353,747 | 11,007,440
Past due | $ 45,489 | $ 44,013
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.40% | 0.40%
Ratio of total past due loans to total loans receivable, current | 99.60% | 99.60%
Ratio of total past due loans to total loans receivable, past due | 0.40% | 0.40%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 11,209 | $ 12,015
Ratio of total past due loans to total loans receivable, past due | 0.10% | 0.11%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 9,762 | $ 6,245
Ratio of total past due loans to total loans receivable, past due | 0.09% | 0.06%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 24,518 | $ 25,753
Ratio of total past due loans to total loans receivable, past due | 0.22% | 0.23%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 5,704,505 | $ 5,709,690
Current | 5,675,605 | 5,671,933
Past due | $ 28,900 | $ 37,757
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.51% | 0.66%
Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 6,268 | $ 10,925
Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 3,621 | 4,810
Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 19,011 | 22,022
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 916,662 | 793,959
Current | 913,419 | 793,959
Past due | $ 3,243 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.35% | 0.00%
Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 948 | $ 0
Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 2,295 | 0
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 295,699 | 277,599
Current | 295,699 | 277,508
Past due | $ 0 | $ 91
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.00% | 0.03%
Construction - custom | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 0 | $ 0
Construction - custom | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Construction - custom | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 91
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 119,063 | 104,856
Current | 117,200 | 104,526
Past due | $ 1,863 | $ 330
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.56% | 0.31%
Land - acquisition & development | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 0 | $ 0
Land - acquisition & development | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Land - acquisition & development | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 1,863 | 330
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 102,705 | 104,335
Current | 101,837 | 103,389
Past due | $ 868 | $ 946
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.85% | 0.91%
Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 328 | $ 112
Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 680
Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 540 | 154
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,328,027 | 1,303,119
Current | 1,327,864 | 1,302,720
Past due | $ 163 | $ 399
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.01% | 0.03%
Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 29 | $ 5
Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 134 | 255
Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 139
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,443,437 | 1,434,610
Current | 1,441,459 | 1,432,052
Past due | $ 1,978 | $ 2,558
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.14% | 0.18%
Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 1,275 | $ 507
Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 98 | 0
Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 605 | 2,051
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,151,108 | 1,093,360
Current | 1,143,385 | 1,092,735
Past due | $ 7,723 | $ 625
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.67% | 0.06%
Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 1,850 | $ 0
Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 5,752 | 51
Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 121 | 574
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 135,119 | 144,850
Current | 134,866 | 143,974
Past due | $ 253 | $ 876
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.19% | 0.60%
HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 163 | $ 221
HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 30 | 342
HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 60 | 313
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 202,911 | 85,075
Current | 202,413 | 84,644
Past due | $ 498 | $ 431
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.25% | 0.51%
Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 348 | $ 245
Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 127 | 107
Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 23 | $ 79

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