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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 10,630,552 | $ 10,071,124
Current | 10,561,096 | 10,002,844
Past due | $ 69,456 | $ 68,280
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.65% | 0.68%
Ratio of total past due loans to total loans receivable, current | 99.35% | 99.32%
Ratio of total past due loans to total loans receivable, past due | 0.65% | 0.68%
Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 22,162 | $ 25,007
Ratio of total past due loans to total loans receivable, past due | 0.21% | 0.25%
Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 8,409 | $ 7,014
Ratio of total past due loans to total loans receivable, past due | 0.08% | 0.07%
Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 38,885 | $ 36,259
Ratio of total past due loans to total loans receivable, past due | 0.37% | 0.36%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 5,692,305 | $ 5,658,122
Current | 5,639,158 | 5,601,457
Past due | $ 53,147 | $ 56,665
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.93% | 1.00%
Single-family residential | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 13,644 | $ 20,916
Single-family residential | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 7,660 | 5,271
Single-family residential | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 31,843 | 30,478
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 593,479 | 498,450
Current | 592,877 | 498,450
Past due | $ 601 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.10% | 0.00%
Construction | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 601 | $ 0
Construction | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Construction | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 251,906 | 229,957
Current | 251,666 | 229,419
Past due | $ 240 | $ 538
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.10% | 0.23%
Construction - custom | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 0 | $ 538
Construction - custom | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Construction - custom | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 240 | 0
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 103,280 | 94,928
Current | 103,018 | 94,928
Past due | $ 262 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.25% | 0.00%
Land - acquisition & development | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 262 | $ 0
Land - acquisition & development | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Land - acquisition & development | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 101,168 | 104,534
Current | 99,907 | 102,472
Past due | $ 1,261 | $ 2,062
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.25% | 1.97%
Land - consumer lot loans | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 360 | $ 816
Land - consumer lot loans | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 333 | 687
Land - consumer lot loans | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 568 | 559
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,266,845 | 1,124,290
Current | 1,265,622 | 1,122,307
Past due | $ 1,224 | $ 1,983
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.10% | 0.18%
Multi-family | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 0 | $ 1,190
Multi-family | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 399
Multi-family | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 1,224 | 394
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,296,019 | 1,093,549
Current | 1,289,677 | 1,088,680
Past due | $ 6,342 | $ 4,869
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.49% | 0.45%
Commercial real estate | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 1,802 | $ 69
Commercial real estate | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 298 | 325
Commercial real estate | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 4,242 | 4,475
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,071,622 | 978,582
Current | 1,066,658 | 978,540
Past due | $ 4,964 | $ 42
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.46% | 0.00%
Commercial & industrial | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 4,964 | $ 0
Commercial & industrial | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 42
Commercial & industrial | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 146,169 | 149,713
Current | 145,355 | 148,513
Past due | $ 814 | $ 1,200
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.56% | 0.80%
HELOC | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 124 | $ 763
HELOC | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 20 | 164
HELOC | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 670 | 273
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 107,759 | 138,999
Current | 107,158 | 138,078
Past due | $ 601 | $ 921
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.56% | 0.66%
Consumer | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 405 | $ 715
Consumer | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 98 | 126
Consumer | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 98 | $ 80

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