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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, 2013 | Sep. 30, 2012
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Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 7,990,545 | $ 7,866,336
Nonaccrual loans by portfolio segment | 131,299 | 173,427
Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,373,950 | 5,779,264
Nonaccrual loans by portfolio segment | 100,460 | 131,193
Construction - speculative |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 130,778 | 131,526
Nonaccrual loans by portfolio segment | 4,560 | 10,634
Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 302,722 | 211,690
Nonaccrual loans by portfolio segment | 0 | 539
Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 81,660 | 128,379
Nonaccrual loans by portfolio segment | 2,903 | 13,477
Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 124,984 | 141,844
Nonaccrual loans by portfolio segment | 3,337 | 5,149
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 835,598 | 710,741
Nonaccrual loans by portfolio segment | 6,573 | 4,185
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 625,293 | 406,364
Nonaccrual loans by portfolio segment | 11,736 | 7,653
Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 326,450 | 166,115
Nonaccrual loans by portfolio segment | 477 | 16
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 133,631 | 126,942
Nonaccrual loans by portfolio segment | 263 | 198
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 55,479 | 63,471
Nonaccrual loans by portfolio segment | 990 | 383
Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,509,967 | 7,581,792
Grade as percentage of total gross assets | 98.30% | 97.80%
Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,258,688 | 5,647,729
Grade as percentage of total gross assets | 98.10% | 97.70%
Performing Loans | Construction - speculative |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 126,218 | 119,003
Grade as percentage of total gross assets | 96.50% | 91.80%
Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 302,722 | 211,151
Grade as percentage of total gross assets | 100.00% | 99.70%
Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 74,872 | 111,200
Grade as percentage of total gross assets | 96.30% | 89.20%
Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 118,334 | 136,695
Grade as percentage of total gross assets | 97.30% | 96.40%
Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 825,111 | 705,955
Grade as percentage of total gross assets | 99.20% | 99.40%
Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 389,423 | 311,557
Grade as percentage of total gross assets | 97.10% | 97.60%
Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 256,525 | 162,807
Grade as percentage of total gross assets | 99.80% | 100.00%
Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 111,923 | 112,704
Grade as percentage of total gross assets | 99.80% | 99.80%
Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 46,151 | 62,991
Grade as percentage of total gross assets | 97.90% | 99.40%
Non-Performing Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 213,616 | 272,905
Nonaccrual loans by portfolio segment | 131,299 | 173,427
Percentage of Total Gross Loans | 1.70% | 2.20%
Non-Performing Loans | Single-family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 100,460 | 131,193
Percentage of Total Gross Loans | 1.90% | 2.30%
Non-Performing Loans | Construction - speculative |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 4,560 | 10,634
Percentage of Total Gross Loans | 3.50% | 8.20%
Non-Performing Loans | Construction - custom |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 0 | 539
Percentage of Total Gross Loans | 0.00% | 0.30%
Non-Performing Loans | Land - acquisition & development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 2,903 | 13,477
Percentage of Total Gross Loans | 3.70% | 10.80%
Non-Performing Loans | Land - consumer lot loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 3,337 | 5,149
Percentage of Total Gross Loans | 2.70% | 3.60%
Non-Performing Loans | Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 6,573 | 4,185
Percentage of Total Gross Loans | 0.80% | 0.60%
Non-Performing Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 11,736 | 7,653
Percentage of Total Gross Loans | 2.90% | 2.40%
Non-Performing Loans | Commercial & industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 477 | 16
Percentage of Total Gross Loans | 0.20% | 0.00%
Non-Performing Loans | HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | 263 | 198
Percentage of Total Gross Loans | 0.20% | 0.20%
Non-Performing Loans | Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 990 | $ 383
Percentage of Total Gross Loans | 2.10% | 0.60%

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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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