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Allowance for Losses on Loans - Internally Assigned Grade (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
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,411,646 | $ 12,066,952
Total grade as a % of total net loans | 99.00% | 98.90%
Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 10,971 | $ 26,760
Total grade as a % of total net loans | 0.10% | 0.20%
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 117,637 | $ 107,675
Total grade as a % of total net loans | 0.90% | 0.90%
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Total grade as a % of total net loans | 0.00% | 0.00%
Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Total grade as a % of total net loans | 0.00% | 0.00%
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,705,350 | $ 5,711,004
Single-family residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,670,826 | 5,671,229
Single-family residential | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Single-family residential | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 34,524 | 39,775
Single-family residential | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Single-family residential | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,732,202 | 1,597,996
Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,727,190 | 1,594,926
Construction | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,012 | 3,070
Construction | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 597,671 | 602,631
Construction - custom | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 597,671 | 602,540
Construction - custom | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction - custom | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 91
Construction - custom | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction - custom | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 141,628 | 124,308
Land - acquisition & development | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 139,442 | 123,028
Land - acquisition & development | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 207
Land - acquisition & development | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 2,186 | 1,073
Land - acquisition & development | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land - acquisition & development | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 102,779 | 104,405
Land - consumer lot loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 101,733 | 103,787
Land - consumer lot loans | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land - consumer lot loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,046 | 618
Land - consumer lot loans | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land - consumer lot loans | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,328,049 | 1,303,148
Multi-family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,325,076 | 1,295,261
Multi-family | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 379 | 5,795
Multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 2,594 | 2,092
Multi-family | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Multi-family | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,443,437 | 1,434,610
Commercial real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,410,194 | 1,391,996
Commercial real estate | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 634 | 5,944
Commercial real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 32,609 | 36,670
Commercial real estate | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Commercial real estate | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,151,108 | 1,093,360
Commercial & industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,101,878 | 1,054,972
Commercial & industrial | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 9,958 | 14,814
Commercial & industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 39,272 | 23,574
Commercial & industrial | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Commercial & industrial | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 135,119 | 144,850
HELOC | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 134,763 | 144,229
HELOC | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
HELOC | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 356 | 621
HELOC | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
HELOC | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 202,911 | 85,075
Consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 202,873 | 84,984
Consumer | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Consumer | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 38 | 91
Consumer | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Consumer | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0

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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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