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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | $ 11,507,160 | $ 11,051,453
Current | 11,461,528 | 11,007,440
Total Delinquent | $ 45,632 | $ 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] |  |
Total Delinquent | $ 9,172 | $ 12,015
Ratio of total past due loans to total loans receivable, past due | 0.08% | 0.11%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 5,981 | $ 6,245
Ratio of total past due loans to total loans receivable, past due | 0.05% | 0.06%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 30,479 | $ 25,753
Ratio of total past due loans to total loans receivable, past due | 0.26% | 0.23%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | $ 5,744,620 | $ 5,709,690
Current | 5,714,962 | 5,671,933
Total Delinquent | $ 29,658 | $ 37,757
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.52% | 0.66%
Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 7,201 | $ 10,925
Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 4,521 | 4,810
Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 17,936 | 22,022
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,012,239 | 793,959
Current | 1,009,782 | 793,959
Total Delinquent | $ 2,457 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.24% | 0.00%
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 | 616 | 0
Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 1,841 | 0
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 285,858 | 277,599
Current | 285,687 | 277,508
Total Delinquent | $ 171 | $ 91
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.06% | 0.03%
Construction - custom | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 171 | $ 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 | 91
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 121,508 | 104,856
Current | 119,593 | 104,526
Total Delinquent | $ 1,915 | $ 330
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.58% | 0.31%
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 | 270 | 0
Land - acquisition & development | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 1,645 | 330
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 103,040 | 104,335
Current | 102,303 | 103,389
Total Delinquent | $ 737 | $ 946
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.72% | 0.91%
Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 128 | $ 112
Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 301 | 680
Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 308 | 154
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,346,512 | 1,303,119
Current | 1,346,512 | 1,302,720
Total Delinquent | $ 0 | $ 399
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.00% | 0.03%
Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 0 | $ 5
Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 255
Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 139
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,435,417 | 1,434,610
Current | 1,433,030 | 1,432,052
Total Delinquent | $ 2,387 | $ 2,558
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.17% | 0.18%
Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 684 | $ 507
Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 0
Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 1,703 | 2,051
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 1,133,075 | 1,093,360
Current | 1,126,480 | 1,092,735
Total Delinquent | $ 6,595 | $ 625
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.58% | 0.06%
Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 0 | $ 0
Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 0 | 51
Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 6,595 | 574
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 136,766 | 144,850
Current | 135,406 | 143,974
Total Delinquent | $ 1,360 | $ 876
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.99% | 0.60%
HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 863 | $ 221
HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 146 | 342
HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 351 | 313
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Loans In Process | 188,125 | 85,075
Current | 187,773 | 84,644
Total Delinquent | $ 352 | $ 431
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.19% | 0.51%
Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 125 | $ 245
Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | 127 | 107
Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Delinquent | $ 100 | $ 79

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