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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 13,020,468 | $ 12,853,678
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,884,713 | $ 12,728,537
Total grade as a % of total gross loans | 99.00% | 99.00%
Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 40,822 | $ 27,197
Total grade as a % of total gross loans | 0.30% | 0.20%
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 94,933 | $ 97,944
Total grade as a % of total gross loans | 0.70% | 0.80%
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Total grade as a % of total gross loans | 0.00% | 0.00%
Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Total grade as a % of total gross loans | 0.00% | 0.00%
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,844,963 | $ 5,798,966
Single-family residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,815,029 | 5,766,096
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 | 29,934 | 32,870
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 | 1,841,674 | 1,890,668
Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,832,326 | 1,886,304
Construction | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,968 | 1,937
Construction | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,380 | 2,427
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 | 607,071 | 624,479
Construction - custom | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 607,071 | 624,479
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 | 0
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 | 181,323 | 155,204
Land - acquisition & development | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 179,602 | 152,984
Land - acquisition & development | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land - acquisition & development | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,721 | 2,220
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 | 100,563 | 102,036
Land - consumer lot loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 99,778 | 101,249
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 | 785 | 787
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 | 1,405,172 | 1,385,125
Multi-family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,397,920 | 1,378,803
Multi-family | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,254 | 1,633
Multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,998 | 4,689
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 | 1,526,887 | 1,452,168
Commercial real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,484,559 | 1,421,602
Commercial real estate | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 19,810 | 7,114
Commercial real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 22,518 | 23,452
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 | 1,213,738 | 1,140,874
Commercial & industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,169,981 | 1,093,405
Commercial & industrial | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 9,790 | 16,513
Commercial & industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 33,967 | 30,956
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 | 136,856 | 130,852
HELOC | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 136,256 | 130,330
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 | 600 | 522
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 | 162,221 | 173,306
Consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 162,191 | 173,285
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 | 30 | 21
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://fasb.org/us-gaap/role/ref/legacyRef -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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