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Mortgage Loans on Real Estate Schedule of Impaired Financing Receivables (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 Months | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |
Mortgage Loans on Real Estate, Interest Only Workout Period Allowed | 6 |
Impaired Financing Receivable, Recorded Investment | $ 70,164 | $ 107,057
Impaired Financing Receivable, Unpaid Principal Balance | 96,586 | 130,721
Impaired Financing Receivable, Related Allowance | (26,422) | (23,664)
Impaired Financing Receivable, Average Recorded Investment | 79,084 | 114,591
Impaired Financing Receivable, Interest Income, Accrual Method | 3,449 | 6,793
Mortgage Loans on Real Estate, Interest Only Workout Period Allowed, Certain Cases | 12 |
Mortgage Loans on Real Estate, Loans in Workout, Period Allowed for Using Amount In Escrow Account for Capital and Tenant Improvement | 12 |
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 39,629 | 44,034
Impaired Financing Receivable, Unpaid Principal Balance | 66,051 | 67,698
Impaired Financing Receivable, Related Allowance | (26,422) | (23,664)
Impaired Financing Receivable, Average Recorded Investment | 48,873 | 53,617
Impaired Financing Receivable, Interest Income, Accrual Method | 1,970 | 3,284
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 30,535 | 63,023
Impaired Financing Receivable, Unpaid Principal Balance | 30,535 | 63,023
Impaired Financing Receivable, Related Allowance | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 30,211 | 60,974
Impaired Financing Receivable, Interest Income, Accrual Method | 1,479 | 3,509
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Individually Evaluated for Impairment | 96,586 | 130,721
Impaired Financing Receivable, Unpaid Principal Balance | 2,762,861 | 2,856,011
Financing Receivable, Collectively Evaluated for Impairment | $ 2,666,275 | $ 2,725,290

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- Definition Represents the total unpaid principal balance of loans that were individually and collectively evaluated for establishment of specific loan loss allowances and the general loan loss allowance. + References No definition available. + Details
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- Definition Represents an interest only period allowed for mortgage loans with workout terms. + References No definition available. + Details
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- Definition Represents an interest onlyperiod of workout terms allowed for mortgage loans under certain circumstances. + References No definition available. + Details
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- Definition Represents the period allowed for payments to be applied to an escrow account to be utilized for capital and tenant improvements to underlying collateral real estate. + References No definition available. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (h) + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (h) + Details
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- Definition The average recorded investment related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(1) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5258-111524 + Details
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- Definition The interest income recognized during the time within that period that the financing receivables were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(2) + Details
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- Definition The recorded investment related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953550-111524 -Subparagraph (b) + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (a)(3) + Details
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- Definition The unpaid principal balance related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 + Details
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