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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 11,640,489 | $ 10,950,608
Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 11,379,052 | $ 10,673,989
Total grade as a % of total net loans | 99.50% | 99.60%
Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 79,738 | $ 71,441
Nonaccrual loans by portfolio segment | $ 57,195 | $ 42,414
Grade as a percentage of total gross loans | 0.50% | 0.40%
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,693,072 | $ 5,658,830
Single-family residential | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,626,725 | $ 5,587,919
Total grade as a % of total net loans | 99.40% | 99.40%
Single-family residential | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 34,373 | $ 33,148
Grade as a percentage of total gross loans | 0.60% | 0.60%
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,311,635 | $ 1,110,411
Construction | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,311,636 | $ 1,110,411
Total grade as a % of total net loans | 100.00% | 100.00%
Construction | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 0
Grade as a percentage of total gross loans | 0.00% | 0.00%
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 527,319 | $ 473,069
Construction - custom | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 527,079 | $ 473,069
Total grade as a % of total net loans | 100.00% | 100.00%
Construction - custom | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 240 | $ 0
Grade as a percentage of total gross loans | 0.00% | 0.00%
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 118,726 | $ 118,497
Land - acquisition & development | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 116,857 | $ 116,097
Total grade as a % of total net loans | 99.90% | 99.90%
Land - acquisition & development | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 80 | $ 58
Grade as a percentage of total gross loans | 0.10% | 0.10%
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 101,227 | $ 104,567
Land - consumer lot loans | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 97,537 | $ 101,343
Total grade as a % of total net loans | 98.90% | 99.50%
Land - consumer lot loans | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 1,129 | $ 510
Grade as a percentage of total gross loans | 1.10% | 0.50%
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,266,911 | $ 1,124,290
Multi-family | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,263,004 | $ 1,118,025
Total grade as a % of total net loans | 99.90% | 99.90%
Multi-family | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 1,364 | $ 776
Grade as a percentage of total gross loans | 0.10% | 0.10%
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,296,039 | $ 1,093,639
Commercial real estate | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,173,483 | $ 949,064
Total grade as a % of total net loans | 99.10% | 99.30%
Commercial real estate | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 10,507 | $ 7,100
Grade as a percentage of total gross loans | 0.90% | 0.70%
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,071,629 | $ 978,589
Commercial & industrial | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,021,889 | $ 946,065
Total grade as a % of total net loans | 99.10% | 99.90%
Commercial & industrial | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 8,864 | $ 583
Grade as a percentage of total gross loans | 0.90% | 0.10%
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 146,172 | $ 149,716
HELOC | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 134,376 | $ 134,546
Total grade as a % of total net loans | 99.60% | 99.80%
HELOC | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 583 | $ 239
Grade as a percentage of total gross loans | 0.40% | 0.20%
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 107,759 | $ 139,000
Consumer | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 106,466 | $ 137,450
Total grade as a % of total net loans | 99.90% | 100.00%
Consumer | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 55 | $ 0
Grade as a 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=65884687&loc=d3e4428-111522 + Details
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