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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 10,950,608 | $ 9,823,270
Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 10,716,403 | 9,493,987
Acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 115,394 | 166,293
Credit-impaired acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 89,837 | 87,081
Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 28,974 | 75,909
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,658,827 |
Single-family residential | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,621,066 | 5,651,845
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,110,411 |
Construction | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,110,411 | 200,509
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 473,069 |
Construction - custom | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 473,069 | 396,307
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 118,497 |
Land - acquisition & development | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 116,156 | 94,208
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 104,568 |
Land - consumer lot loans | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 101,853 | 103,989
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,124,289 |
Multi-family | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,118,801 | 1,125,722
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,093,639 |
Commercial real estate | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 956,164 | 986,270
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 978,589 |
Commercial & industrial | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 946,648 | 612,836
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 149,717 |
HELOC | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 134,785 | 127,646
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 139,002 |
Consumer | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 137,450 | 194,655
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 10,764,097 | $ 9,605,919
Grade as percentage of total gross assets | 98.30% | 97.80%
Pass | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 10,565,849 | $ 9,333,233
Pass | Acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 108,616 | 149,891
Pass | Credit-impaired acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 60,985 | 61,019
Pass | Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 28,647 | 61,776
Pass | Single-family residential | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,570,634 | 5,558,700
Pass | Construction | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,098,549 | 197,935
Pass | Construction - custom | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 473,069 | 396,307
Pass | Land - acquisition & development | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 110,125 | 89,656
Pass | Land - consumer lot loans | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 100,862 | 103,569
Pass | Multi-family | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,112,342 | 1,118,673
Pass | Commercial real estate | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 928,032 | 971,510
Pass | Commercial & industrial | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 900,571 | 575,034
Pass | HELOC | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 134,298 | 127,398
Pass | Consumer | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 137,367 | 194,451
Special mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 32,485 | $ 6,721
Grade as percentage of total gross assets | 0.30% | 0.10%
Special mention | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 32,438 | $ 6,721
Special mention | Acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 47 | 0
Special mention | Credit-impaired acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Special mention | Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Special mention | Single-family residential | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Special mention | Construction | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 8,595 | 0
Special mention | Construction - custom | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Special mention | Land - acquisition & development | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Special mention | Land - consumer lot loans | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Special mention | Multi-family | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,237 | 865
Special mention | Commercial real estate | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 13,446 | 4,360
Special mention | Commercial & industrial | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,160 | 1,496
Special mention | HELOC | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Special mention | Consumer | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 154,026 | $ 210,630
Grade as percentage of total gross assets | 1.40% | 2.10%
Substandard | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 118,116 | $ 154,033
Substandard | Acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 6,731 | 16,402
Substandard | Credit-impaired acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 28,852 | 26,062
Substandard | Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 327 | 14,133
Substandard | Single-family residential | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 50,432 | 93,145
Substandard | Construction | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,267 | 2,574
Substandard | Construction - custom | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Substandard | Land - acquisition & development | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 6,031 | 4,552
Substandard | Land - consumer lot loans | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 991 | 420
Substandard | Multi-family | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,222 | 6,184
Substandard | Commercial real estate | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 14,686 | 10,400
Substandard | Commercial & industrial | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 38,917 | 36,306
Substandard | HELOC | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 487 | 248
Substandard | Consumer | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 83 | 204
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Grade as percentage of total gross assets | 0.00% | 0.00%
Doubtful | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Doubtful | Acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Credit-impaired acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Single-family residential | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Construction | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Construction - custom | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Land - acquisition & development | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Land - consumer lot loans | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Multi-family | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Commercial real estate | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Commercial & industrial | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | HELOC | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Doubtful | Consumer | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Grade as percentage of total gross assets | 0.00% | 0.00%
Loss | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 0 | $ 0
Loss | Acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Credit-impaired acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Single-family residential | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Construction | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Construction - custom | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Land - acquisition & development | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Land - consumer lot loans | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Multi-family | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Commercial real estate | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Commercial & industrial | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | HELOC | Non-acquired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Loss | Consumer | Non-acquired loans |  |
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=65884687&loc=d3e4428-111522 + Details
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