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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 10,950,608 | $ 9,823,270
Nonaccrual loans by portfolio segment | 42,414 | 67,810
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,658,827 |
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,110,411 |
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 473,069 |
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 118,497 |
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 104,568 |
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,124,289 |
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,093,639 |
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 978,589 |
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 149,717 |
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 139,002 |
Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 10,673,989 | $ 9,426,177
Grade as percentage of total gross assets | 99.60% | 99.30%
Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,587,919 | $ 5,592,771
Grade as percentage of total gross assets | 99.40% | 99.00%
Performing Loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,110,411 | $ 199,755
Grade as percentage of total gross assets | 100.00% | 99.60%
Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 473,069 | $ 395,575
Grade as percentage of total gross assets | 100.00% | 99.80%
Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 116,097 | $ 94,208
Grade as percentage of total gross assets | 99.90% | 100.00%
Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 101,343 | $ 102,716
Grade as percentage of total gross assets | 99.50% | 98.80%
Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,118,025 | $ 1,123,165
Grade as percentage of total gross assets | 99.90% | 99.80%
Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 949,064 | $ 984,093
Grade as percentage of total gross assets | 99.30% | 99.80%
Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 946,065 | $ 612,836
Grade as percentage of total gross assets | 99.90% | 100.00%
Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 134,546 | $ 127,083
Grade as percentage of total gross assets | 99.80% | 99.60%
Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 137,450 | $ 193,975
Grade as percentage of total gross assets | 100.00% | 99.70%
Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 71,441 | $ 128,908
Nonaccrual loans by portfolio segment | $ 42,414 | $ 67,810
Percentage of total gross loans | 0.40% | 0.70%
Non-Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 33,148 | $ 59,074
Percentage of total gross loans | 0.60% | 1.00%
Non-Performing Loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 754
Percentage of total gross loans | 0.00% | 0.40%
Non-Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 732
Percentage of total gross loans | 0.00% | 0.20%
Non-Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 58 | $ 0
Percentage of total gross loans | 0.10% | 0.00%
Non-Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 510 | $ 1,273
Percentage of total gross loans | 0.50% | 1.20%
Non-Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 776 | $ 2,558
Percentage of total gross loans | 0.10% | 0.20%
Non-Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 7,100 | $ 2,176
Percentage of total gross loans | 0.70% | 0.20%
Non-Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 583 | $ 0
Percentage of total gross loans | 0.10% | 0.00%
Non-Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 239 | $ 563
Percentage of total gross loans | 0.20% | 0.40%
Non-Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 680
Percentage of total gross loans | 0.00% | 0.30%

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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=65884687&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=66008989&loc=d3e5111-111524 + Details
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