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Mortgage Loans on Real Estate (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 loans | Sep. 30, 2012 loans | Sep. 30, 2013 loans | Sep. 30, 2012 loans | Dec. 31, 2012
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage loans on real estate | $ 2,593,851,000 |  | $ 2,593,851,000 |  | $ 2,623,940,000
Commitments outstanding | 81,200,000 |  | 81,200,000 |  |
Number of portfolio segments that make up financing receivables | 1 |  | 1 |  |
Number of days past due, delinquent status |  |  | 60 days |  |
Number of days past due, non-accrual status |  |  | 90 days |  |
Impaired mortgage loans, workout terms, interest only payments, six month terms |  |  | 6 months |  |
Impaired mortgage loans, workout terms, interest only payments, twelve month terms |  |  | 12 months |  |
Impaired mortgage loans, workout terms, cash flow sweep, number of months |  |  | 12 months |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |
Mortgage loans on real estate | 2,593,851,000 |  | 2,593,851,000 |  | 2,623,940,000
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of mortgage loans satisfied by foreclosure | 3 | 2 | 4 | 8 |
Outstanding principal of loans in a non-accrual status | $ 6,000,000 |  | $ 6,000,000 |  | $ 34,700,000

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- Definition Number of days past due for loans to be considered delinquent. + References No definition available. + Details
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- Definition Circumstances in which borrowers pay a protion of their loan payment into an escrow account that can be used for capital and tenant improvements of a period not more than 12 months. + References No definition available. + Details
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- Definition Loan workout terms in which a borrower makes interest only payments on the commerical mortgage loan. + References No definition available. + Details
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- Definition Loan workout terms in which a borrower makes interest only payments on the commerical mortgage loan. + References No definition available. + Details
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- Definition Represents the number of loans that were satisfied by taking ownership of the underlying collateral during the reporting period. + References No definition available. + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + 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 (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + Details
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- Definition The undisbursed portion of the commercial loan receivable balance (loans in process) which is deducted separately from total loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph g -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 47 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph c -Article 7 + Details
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