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Allowance for Losses on Loans (Credit Risk Profile Based on Payment Activity) (Details) (USD $) | Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 8,447,709,000 | $ 7,990,545,000 |
Nonaccrual loans by portfolio segment | 94,226,000 | 131,299,000 | 131,299,000
Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 8,072,881,000 | 7,509,967,000 |
Grade as percentage of total gross loans | 98.80% | 98.30% |
Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 162,357,000 |  | 213,616,000
Grade as percentage of total gross loans | 1.10% |  | 1.60%
Nonaccrual loans by portfolio segment | 94,226,000 | 131,299,000 |
Grade as a percentage of total gross loans | 1.20% | 1.70% |
Single-Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 5,479,111,000 | 5,373,950,000 |
Nonaccrual loans by portfolio segment | 78,317,000 | 100,460,000 |
Single-Family Residential [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 5,388,454,000 | 5,258,688,000 |
Grade as percentage of total gross loans | 98.60% | 98.10% |
Single-Family Residential [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 78,317,000 | 100,460,000 |
Grade as a percentage of total gross loans | 1.40% | 1.90% |
Construction - Speculative [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 126,926,000 | 130,778,000 |
Nonaccrual loans by portfolio segment | 1,966,000 | 4,560,000 |
Construction - Speculative [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 124,960,000 | 126,218,000 |
Grade as percentage of total gross loans | 98.50% | 96.50% |
Construction - Speculative [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 1,966,000 | 4,560,000 |
Grade as a percentage of total gross loans | 1.50% | 3.50% |
Construction - Custom [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 372,789,000 | 302,722,000 |
Nonaccrual loans by portfolio segment | 143,000 | 0 |
Construction - Custom [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 372,646,000 | 302,722,000 |
Grade as percentage of total gross loans | 100.00% | 100.00% |
Construction - Custom [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 143,000 | 0 |
Grade as a percentage of total gross loans | 0.00% | 0.00% |
Land - Acquisition & Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 91,058,000 | 81,660,000 |
Nonaccrual loans by portfolio segment | 2,295,000 | 2,903,000 |
Land - Acquisition & Development [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 86,024,000 | 74,872,000 |
Grade as percentage of total gross loans | 97.40% | 96.30% |
Land - Acquisition & Development [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 2,295,000 | 2,903,000 |
Grade as a percentage of total gross loans | 2.60% | 3.70% |
Land - Consumer Lot Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 114,573,000 | 124,984,000 |
Nonaccrual loans by portfolio segment | 1,879,000 | 3,337,000 |
Land - Consumer Lot Loans [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 110,040,000 | 118,334,000 |
Grade as percentage of total gross loans | 98.30% | 97.30% |
Land - Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 1,879,000 | 3,337,000 |
Grade as a percentage of total gross loans | 1.70% | 2.70% |
Multi-Family [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 896,799,000 | 835,598,000 |
Nonaccrual loans by portfolio segment | 2,103,000 | 6,573,000 |
Multi-Family [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 891,639,000 | 825,111,000 |
Grade as percentage of total gross loans | 99.80% | 99.20% |
Multi-Family [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 2,103,000 | 6,573,000 |
Grade as a percentage of total gross loans | 0.20% | 0.80% |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 693,421,000 | 625,293,000 |
Nonaccrual loans by portfolio segment | 5,442,000 | 11,736,000 |
Commercial Real Estate [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 518,408,000 | 389,423,000 |
Grade as percentage of total gross loans | 99.00% | 97.10% |
Commercial Real Estate [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 5,442,000 | 11,736,000 |
Grade as a percentage of total gross loans | 1.00% | 2.90% |
Commercial & Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 398,181,000 | 326,450,000 |
Nonaccrual loans by portfolio segment | 516,000 | 477,000 |
Commercial & Industrial [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 333,036,000 | 256,525,000 |
Grade as percentage of total gross loans | 99.80% | 99.80% |
Commercial & Industrial [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 516,000 | 477,000 |
Grade as a percentage of total gross loans | 0.20% | 0.20% |
HELOC [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 136,304,000 | 133,631,000 |
Nonaccrual loans by portfolio segment | 970,000 | 263,000 |
HELOC [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 116,207,000 | 111,923,000 |
Grade as percentage of total gross loans | 99.20% | 99.80% |
HELOC [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 970,000 | 263,000 |
Grade as a percentage of total gross loans | 0.80% | 0.20% |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 138,547,000 | 55,479,000 |
Nonaccrual loans by portfolio segment | 595,000 | 990,000 |
Consumer [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 131,467,000 | 46,151,000 |
Grade as percentage of total gross loans | 99.50% | 97.90% |
Consumer [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 595,000 | $ 990,000 |
Grade as a percentage of total gross loans | 0.50% | 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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