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Allowance for Losses on Loans - Internally Assigned Grade (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
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 11,486,002 | $ 10,764,097
Total grade as a % of total net loans | 98.70% | 98.30%
Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 24,017 | $ 32,485
Total grade as a % of total net loans | 0.20% | 0.30%
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 130,470 | $ 154,026
Total grade as a % of total net loans | 1.10% | 1.40%
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 | $ 5,693,072 | $ 5,658,830
Single-family residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,643,124 | 5,607,521
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 | 49,948 | 51,309
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 | 1,311,635 | 1,110,411
Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,302,209 | 1,098,549
Construction | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,875 | 8,595
Construction | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,551 | 3,267
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 | 527,319 | 473,069
Construction - custom | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 527,079 | 473,069
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 | 240 | 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 | 118,726 | 118,497
Land - acquisition & development | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 115,816 | 111,225
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 | 2,910 | 7,272
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 | 101,227 | 104,567
Land - consumer lot loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 100,098 | 103,528
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 | 1,129 | 1,039
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 | 1,266,911 | 1,124,290
Multi-family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,251,583 | 1,117,437
Multi-family | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,206 | 3,237
Multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 12,122 | 3,616
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 | 1,296,039 | 1,093,639
Commercial real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,251,520 | 1,033,880
Commercial real estate | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 6,918 | 13,446
Commercial real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 37,601 | 46,313
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 | 1,071,629 | 978,589
Commercial & industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,041,903 | 930,776
Commercial & industrial | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 8,018 | 7,207
Commercial & industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 21,708 | 40,606
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 | 146,172 | 149,716
HELOC | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 144,972 | 149,195
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 | 1,200 | 521
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 | 107,759 | 139,000
Consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 107,698 | 138,917
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 | 61 | 83
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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