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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,201,387 | $ 10,950,608
Nonaccrual loans by portfolio segment | 49,580 | 42,414
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,711,004 | 5,658,830
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,597,996 | 1,110,411
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 602,631 | 473,069
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 124,308 | 118,497
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 104,405 | 104,567
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,303,148 | 1,124,290
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,434,610 | 1,093,639
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,093,360 | 978,589
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 144,850 | 149,716
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 85,075 | 139,000
Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,151,807 | $ 10,908,194
Grade as percentage of total gross assets | 99.60% | 99.60%
Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,683,074 | $ 5,625,682
Grade as percentage of total gross assets | 99.50% | 99.40%
Performing Loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,597,996 | $ 1,110,411
Grade as percentage of total gross assets | 100.00% | 100.00%
Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 602,540 | $ 473,069
Grade as percentage of total gross assets | 99.90% | 100.00%
Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 124,012 | $ 118,439
Grade as percentage of total gross assets | 99.80% | 99.90%
Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 103,800 | $ 104,057
Grade as percentage of total gross assets | 99.40% | 99.50%
Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,303,009 | $ 1,123,583
Grade as percentage of total gross assets | 99.90% | 99.90%
Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,422,795 | $ 1,086,470
Grade as percentage of total gross assets | 99.20% | 99.30%
Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,085,278 | $ 978,006
Grade as percentage of total gross assets | 99.30% | 99.90%
Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 144,319 | $ 149,477
Grade as percentage of total gross assets | 99.60% | 99.80%
Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 84,984 | $ 139,000
Grade as percentage of total gross assets | 99.90% | 100.00%
Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 70,238 | $ 71,441
Nonaccrual loans by portfolio segment | $ 49,580 | $ 42,414
Percentage of total gross loans | 0.40% | 0.40%
Non-Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 27,930 | $ 33,148
Percentage of total gross loans | 0.50% | 0.60%
Non-Performing Loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 0
Percentage of total gross loans | 0.00% | 0.00%
Non-Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 91 | $ 0
Percentage of total gross loans | 0.10% | 0.00%
Non-Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 296 | $ 58
Percentage of total gross loans | 0.20% | 0.10%
Non-Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 605 | $ 510
Percentage of total gross loans | 0.60% | 0.50%
Non-Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 139 | $ 776
Percentage of total gross loans | 0.10% | 0.10%
Non-Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 11,815 | $ 7,100
Percentage of total gross loans | 0.80% | 0.70%
Non-Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 8,082 | $ 583
Percentage of total gross loans | 0.70% | 0.10%
Non-Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 531 | $ 239
Percentage of total gross loans | 0.40% | 0.20%
Non-Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 91 | $ 0
Percentage of total gross loans | 0.10% | 0.00%

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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