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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 8,669,717 | $ 7,990,545
Nonaccrual loans by portfolio segment | 87,431 | 131,299
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,572,244 | 5,373,950
Nonaccrual loans by portfolio segment | 74,067 | 100,460
Construction - speculative |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 140,060 | 130,778
Nonaccrual loans by portfolio segment | 1,477 | 4,560
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 385,824 | 302,722
Nonaccrual loans by portfolio segment | 0 | 0
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 80,359 | 81,660
Nonaccrual loans by portfolio segment | 811 | 2,903
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 111,130 | 124,984
Nonaccrual loans by portfolio segment | 2,637 | 3,337
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 920,285 | 835,598
Nonaccrual loans by portfolio segment | 1,742 | 6,573
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 752,957 | 625,293
Nonaccrual loans by portfolio segment | 5,106 | 11,736
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 434,088 | 326,450
Nonaccrual loans by portfolio segment | 7 | 477
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 134,455 | 133,631
Nonaccrual loans by portfolio segment | 795 | 263
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 138,315 | 55,479
Nonaccrual loans by portfolio segment | 789 | 990
Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 8,321,591 | 7,509,967
Grade as percentage of total gross assets | 99.00% | 98.30%
Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,486,136 | 5,258,688
Grade as percentage of total gross assets | 98.70% | 98.10%
Performing Loans | Construction - speculative |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 138,583 | 126,218
Grade as percentage of total gross assets | 98.90% | 96.50%
Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 385,824 | 302,722
Grade as percentage of total gross assets | 100.00% | 100.00%
Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 77,021 | 74,872
Grade as percentage of total gross assets | 99.00% | 96.30%
Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 105,986 | 118,334
Grade as percentage of total gross assets | 97.60% | 97.30%
Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 915,544 | 825,111
Grade as percentage of total gross assets | 99.80% | 99.20%
Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 586,230 | 389,423
Grade as percentage of total gross assets | 99.10% | 97.10%
Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 379,219 | 256,525
Grade as percentage of total gross assets | 100.00% | 99.80%
Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 115,247 | 111,923
Grade as percentage of total gross assets | 99.30% | 99.80%
Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 131,801 | 46,151
Grade as percentage of total gross assets | 99.40% | 97.90%
Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 147,311 | 213,616
Nonaccrual loans by portfolio segment | 87,431 | 131,299
Percentage of total gross loans | 1.00% | 1.70%
Non-Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 74,067 | 100,460
Percentage of total gross loans | 1.30% | 1.90%
Non-Performing Loans | Construction - speculative |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 1,477 | 4,560
Percentage of total gross loans | 1.10% | 3.50%
Non-Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 0 | 0
Percentage of total gross loans | 0.00% | 0.00%
Non-Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 811 | 2,903
Percentage of total gross loans | 1.00% | 3.70%
Non-Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 2,637 | 3,337
Percentage of total gross loans | 2.40% | 2.70%
Non-Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 1,742 | 6,573
Percentage of total gross loans | 0.20% | 0.80%
Non-Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 5,106 | 11,736
Percentage of total gross loans | 0.90% | 2.90%
Non-Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 7 | 477
Percentage of total gross loans | 0.00% | 0.20%
Non-Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 795 | 263
Percentage of total gross loans | 0.70% | 0.20%
Non-Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 789 | $ 990
Percentage of total gross loans | 0.60% | 2.10%

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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=28367877&loc=d3e4428-111522 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans. + References No definition available. + Details
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- Definition Grade as Percentage of Total Gross Loans + References No definition available. + Details
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