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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,540,254 | $ 12,201,387
Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,486,446 | $ 12,151,807
Total grade as a % of total net loans | 99.60% | 99.60%
Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 69,712 | $ 70,238
Nonaccrual loans by portfolio segment | $ 53,808 | $ 49,580
Grade as a percentage of total gross loans | 0.40% | 0.40%
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,705,350 | $ 5,711,004
Single-family residential | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,680,031 | $ 5,683,074
Total grade as a % of total net loans | 99.60% | 99.50%
Single-family residential | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 25,319 | $ 27,930
Grade as a percentage of total gross loans | 0.40% | 0.50%
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,732,202 | $ 1,597,996
Construction | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,729,906 | $ 1,597,996
Total grade as a % of total net loans | 99.90% | 100.00%
Construction | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 2,296 | $ 0
Grade as a percentage of total gross loans | 0.10% | 0.00%
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 597,671 | $ 602,631
Construction - custom | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 597,671 | $ 602,540
Total grade as a % of total net loans | 100.00% | 99.90%
Construction - custom | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 91
Grade as a percentage of total gross loans | 0.00% | 0.10%
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 141,628 | $ 124,308
Land - acquisition & development | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 139,624 | $ 124,012
Total grade as a % of total net loans | 98.60% | 99.80%
Land - acquisition & development | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 2,004 | $ 296
Grade as a percentage of total gross loans | 1.40% | 0.20%
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 102,779 | $ 104,405
Land - consumer lot loans | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 101,734 | $ 103,800
Total grade as a % of total net loans | 99.00% | 99.40%
Land - consumer lot loans | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 1,045 | $ 605
Grade as a percentage of total gross loans | 1.00% | 0.60%
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,328,049 | $ 1,303,148
Multi-family | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,328,049 | $ 1,303,009
Total grade as a % of total net loans | 100.00% | 99.90%
Multi-family | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 139
Grade as a percentage of total gross loans | 0.00% | 0.10%
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,443,437 | $ 1,434,610
Commercial real estate | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,433,910 | $ 1,422,795
Total grade as a % of total net loans | 99.30% | 99.20%
Commercial real estate | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 9,527 | $ 11,815
Grade as a percentage of total gross loans | 0.70% | 0.80%
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,151,108 | $ 1,093,360
Commercial & industrial | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,137,746 | $ 1,085,278
Total grade as a % of total net loans | 98.80% | 99.30%
Commercial & industrial | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 13,362 | $ 8,082
Grade as a percentage of total gross loans | 1.20% | 0.70%
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 135,119 | $ 144,850
HELOC | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 134,902 | $ 144,319
Total grade as a % of total net loans | 99.80% | 99.60%
HELOC | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 217 | $ 531
Grade as a percentage of total gross loans | 0.20% | 0.40%
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 202,911 | $ 85,075
Consumer | Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 202,873 | $ 84,984
Total grade as a % of total net loans | 100.00% | 99.90%
Consumer | Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 38 | $ 91
Grade as a percentage of total gross loans | 0.00% | 0.10%

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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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