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Allowance for Losses on Loans (Credit Risk Profile Based on Payment Activity) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 8,031,093 | $ 7,866,336 |
Nonaccrual loans by portfolio segment | 163,116 | 173,427 | 185,783
Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 7,421,176 | 7,581,792 |
Grade as percentage of total gross loans | 97.80% | 97.80% |
Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 264,219 |  | 343,665
Grade as percentage of total gross loans | 2.02% |  | 2.52%
Nonaccrual loans by portfolio segment | 163,116 | 173,427 |
Grade as a percetage of total gross loans | 2.20% | 2.20% |
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 5,589,425 | 5,779,264 |
Nonaccrual loans by portfolio segment | 108,570 | 131,193 |
Residential Portfolio Segment [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 5,465,020 | 5,647,729 |
Grade as percentage of total gross loans | 98.10% | 97.70% |
Residential Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 108,570 | 131,193 |
Grade as a percetage of total gross loans | 1.90% | 2.30% |
Construction, Speculative [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 125,716 | 131,526 |
Nonaccrual loans by portfolio segment | 9,471 | 10,634 |
Construction, Speculative [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 114,400 | 119,003 |
Grade as percentage of total gross loans | 92.40% | 91.80% |
Construction, Speculative [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 9,471 | 10,634 |
Grade as a percetage of total gross loans | 7.60% | 8.20% |
Construction, Custom [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 229,134 | 211,690 |
Nonaccrual loans by portfolio segment | 39 | 539 |
Construction, Custom [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 228,101 | 211,151 |
Grade as percentage of total gross loans | 100.00% | 99.70% |
Construction, Custom [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 39 | 539 |
Grade as a percetage of total gross loans | 0.00% | 0.30% |
Land, Acquisition and Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 115,655 | 128,379 |
Nonaccrual loans by portfolio segment | 14,318 | 13,477 |
Land, Acquisition and Development [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 95,140 | 111,200 |
Grade as percentage of total gross loans | 86.90% | 89.20% |
Land, Acquisition and Development [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 14,318 | 13,477 |
Grade as a percetage of total gross loans | 13.10% | 10.80% |
Land, Consumer Lot Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 140,997 | 141,844 |
Nonaccrual loans by portfolio segment | 4,024 | 5,149 |
Land, Consumer Lot Loans [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 133,082 | 136,695 |
Grade as percentage of total gross loans | 97.10% | 96.40% |
Land, Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 4,024 | 5,149 |
Grade as a percetage of total gross loans | 2.90% | 3.60% |
Multi Family Housing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 731,135 | 710,741 |
Nonaccrual loans by portfolio segment | 7,907 | 4,185 |
Multi Family Housing [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 713,895 | 705,955 |
Grade as percentage of total gross loans | 98.90% | 99.40% |
Multi Family Housing [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 7,907 | 4,185 |
Grade as a percetage of total gross loans | 1.10% | 0.60% |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 609,948 | 406,364 |
Nonaccrual loans by portfolio segment | 16,958 | 7,653 |
Commercial Real Estate Portfolio Segment [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 330,606 | 311,557 |
Grade as percentage of total gross loans | 95.10% | 97.60% |
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 16,958 | 7,653 |
Grade as a percetage of total gross loans | 4.90% | 2.40% |
Commercial and Industrial Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 280,458 | 166,115 |
Nonaccrual loans by portfolio segment | 987 | 16 |
Commercial and Industrial Loans [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 170,657 | 162,807 |
Grade as percentage of total gross loans | 99.40% | 100.00% |
Commercial and Industrial Loans [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 987 | 16 |
Grade as a percetage of total gross loans | 0.60% | 0.00% |
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 138,645 | 126,942 |
Nonaccrual loans by portfolio segment | 489 | 198 |
Home Equity Line of Credit [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 111,497 | 112,704 |
Grade as percentage of total gross loans | 99.60% | 99.80% |
Home Equity Line of Credit [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 489 | 198 |
Grade as a percetage of total gross loans | 0.40% | 0.20% |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 69,980 | 63,471 |
Nonaccrual loans by portfolio segment | 353 | 383 |
Consumer Portfolio Segment [Member] | Performing Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | 58,778 | 62,991 |
Grade as percentage of total gross loans | 99.40% | 99.40% |
Consumer Portfolio Segment [Member] | Nonperforming Financing Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 353 | $ 383 |
Grade as a percetage of total gross loans | 0.60% | 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=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=7512638&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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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