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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,456,216 | $ 12,201,387
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 12,326,705 | $ 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 | $ 17,346 | $ 26,760
Total grade as a % of total net loans | 0.10% | 0.20%
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 112,165 | $ 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 | $ 5,693,318 | $ 5,711,004
Single-family residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,657,731 | 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 | 35,587 | 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 | 1,710,418 | 1,597,996
Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,707,044 | 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 | 3,374 | 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 | 583,580 | 602,631
Construction - custom | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 583,580 | 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 | 136,938 | 124,308
Land - acquisition & development | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 134,625 | 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 | 2,313 | 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 | 105,086 | 104,405
Land - consumer lot loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 104,105 | 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 | 981 | 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 | 1,312,695 | 1,303,148
Multi-family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,304,991 | 1,295,261
Multi-family | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,159 | 5,795
Multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 4,545 | 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 | 1,436,508 | 1,434,610
Commercial real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,401,236 | 1,391,996
Commercial real estate | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,764 | 5,944
Commercial real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 31,508 | 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 | 1,120,707 | 1,093,360
Commercial & industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,077,207 | 1,054,972
Commercial & industrial | Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 10,423 | 14,814
Commercial & industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 33,077 | 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 | 136,995 | 144,850
HELOC | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 136,287 | 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 | 708 | 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 | 219,971 | 85,075
Consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 219,899 | 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 | 72 | 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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