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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 10,301,465 | $ 10,071,124
Current | 10,225,248 | 10,002,844
Past due | $ 76,217 | $ 68,280
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.74% | 0.68%
Ratio of total past due loans to total loans receivable, current | 99.26% | 99.32%
Ratio of total past due loans to total loans receivable, past due | 0.74% | 0.68%
Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 23,060 | $ 25,007
Ratio of total past due loans to total loans receivable, past due | 0.22% | 0.25%
Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 8,323 | $ 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 | $ 44,834 | $ 36,259
Ratio of total past due loans to total loans receivable, past due | 0.44% | 0.36%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 5,623,668 | $ 5,658,122
Current | 5,563,465 | 5,601,457
Past due | $ 60,203 | $ 56,665
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.07% | 1.00%
Single-family residential | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 16,670 | $ 20,916
Single-family residential | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 6,808 | 5,271
Single-family residential | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 36,725 | 30,478
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 513,046 | 498,450
Current | 512,705 | 498,450
Past due | $ 341 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.07% | 0.00%
Construction | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 341 | $ 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 | 236,668 | 229,957
Current | 236,511 | 229,419
Past due | $ 157 | $ 538
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.07% | 0.23%
Construction - custom | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 49 | $ 538
Construction - custom | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 108 | 0
Construction - custom | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 103,148 | 94,928
Current | 101,886 | 94,928
Past due | $ 1,262 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.22% | 0.00%
Land - acquisition & development | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 728 | $ 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 | 534 | 0
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 101,045 | 104,534
Current | 99,969 | 102,472
Past due | $ 1,076 | $ 2,062
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.06% | 1.97%
Land - consumer lot loans | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 235 | $ 816
Land - consumer lot loans | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 43 | 687
Land - consumer lot loans | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 798 | 559
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,217,594 | 1,124,290
Current | 1,215,726 | 1,122,307
Past due | $ 1,868 | $ 1,983
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.15% | 0.18%
Multi-family | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 853 | $ 1,190
Multi-family | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 616 | 399
Multi-family | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 399 | 394
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,175,475 | 1,093,549
Current | 1,167,710 | 1,088,680
Past due | $ 7,765 | $ 4,869
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.66% | 0.45%
Commercial real estate | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 1,771 | $ 69
Commercial real estate | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 267 | 325
Commercial real estate | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 5,727 | 4,475
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 1,057,826 | 978,582
Current | 1,056,718 | 978,540
Past due | $ 1,108 | $ 42
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.10% | 0.00%
Commercial & industrial | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 858 | $ 0
Commercial & industrial | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 250 | 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 | 148,448 | 149,713
Current | 147,074 | 148,513
Past due | $ 1,374 | $ 1,200
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.93% | 0.80%
HELOC | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 893 | $ 763
HELOC | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 164
HELOC | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 481 | 273
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 124,547 | 138,999
Current | 123,484 | 138,078
Past due | $ 1,063 | $ 921
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.85% | 0.66%
Consumer | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 662 | $ 715
Consumer | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 231 | 126
Consumer | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 170 | $ 80

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