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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 11,280,574 | $ 11,051,453
Current | 11,232,320 | 11,007,440
Past due | $ 48,254 | $ 44,013
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.43% | 0.40%
Ratio of total past due loans to total loans receivable, current | 99.57% | 99.60%
Ratio of total past due loans to total loans receivable, past due | 0.43% | 0.40%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 15,222 | $ 12,015
Ratio of total past due loans to total loans receivable, past due | 0.13% | 0.11%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 9,034 | $ 6,245
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] |  |
Past due | $ 23,998 | $ 25,753
Ratio of total past due loans to total loans receivable, past due | 0.21% | 0.23%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 5,692,045 | $ 5,709,690
Current | 5,655,873 | 5,671,933
Past due | $ 36,172 | $ 37,757
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.64% | 0.66%
Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 9,801 | $ 10,925
Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 6,073 | 4,810
Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 20,298 | 22,022
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 852,164 | 793,959
Current | 847,793 | 793,959
Past due | $ 4,371 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.51% | 0.00%
Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 1,500 | $ 0
Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 2,507 | 0
Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 364 | 0
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 292,255 | 277,599
Current | 292,255 | 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 | 112,260 | 104,856
Current | 111,018 | 104,526
Past due | $ 1,242 | $ 330
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.11% | 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 | 1,242 | 330
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 104,996 | 104,335
Current | 104,246 | 103,389
Past due | $ 750 | $ 946
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.71% | 0.91%
Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 107 | $ 112
Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 153 | 680
Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 490 | 154
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,312,673 | 1,303,119
Current | 1,312,423 | 1,302,720
Past due | $ 250 | $ 399
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.02% | 0.03%
Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 0 | $ 5
Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 255
Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 250 | 139
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,436,508 | 1,434,610
Current | 1,436,064 | 1,432,052
Past due | $ 444 | $ 2,558
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.03% | 0.18%
Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 129 | $ 507
Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 315 | 2,051
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,120,707 | 1,093,360
Current | 1,117,240 | 1,092,735
Past due | $ 3,467 | $ 625
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.31% | 0.06%
Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 2,894 | $ 0
Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 51
Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 573 | 574
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 136,995 | 144,850
Current | 136,004 | 143,974
Past due | $ 991 | $ 876
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.72% | 0.60%
HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 439 | $ 221
HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 147 | 342
HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 405 | 313
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 219,971 | 85,075
Current | 219,404 | 84,644
Past due | $ 567 | $ 431
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.26% | 0.51%
Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 352 | $ 245
Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 154 | 107
Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 61 | $ 79

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