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Mortgage Loans on Real Estate Allowance for Loan Losses Table (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Mar. 31, 2012 | Mar. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing Receivable, Periods Considered for Calculation of General Loan Loss Allowance |  |  | 4 |  |  |
Financing Receivable, Debt Service Coverage Ratio Considered for Calculation of General Loan Loss Allowance |  |  | 1.0 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Specific Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  | $ (23,664) | $ (13,224) | $ (25,445) | $ (15,027)
Financing Receivable, Allowance for Credit Losses, Charge-offs | 1,932 | 5,877 | 10,445 | 8,994 |  |
Financing Receivable, Allowance for Credit Losses, Recoveries | 0 | 0 | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Provisions | (2,909) | (15,961) | (13,203) | (20,881) |  |
Financing Receivable, Allowance for Credit Losses | (26,422) | (25,111) | (26,422) | (25,111) | (25,445) | (15,027)
Commercial Real Estate Portfolio Segment [Member] | General Allowance [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  | (9,300) | (3,000) | (11,200) | (4,200)
Financing Receivable, Allowance for Credit Losses, Charge-offs | 0 | 0 | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Recoveries | 0 | 0 | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Provisions | (400) | (1,500) | (2,300) | (2,700) |  |
Financing Receivable, Allowance for Credit Losses | $ (11,600) | $ (5,700) | $ (11,600) | $ (5,700) | $ (11,200) | $ (4,200)

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- Definition Represents the Debt Service Coverage Ratio (DSCR) utilized in calculating the general loan loss allowance. Loans analyzed have a DSCR less than 1.0. + References No definition available. + Details
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- Definition Represents the number of quarters considered for calculation of general loan loss allowance. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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 (c)(1) + Details
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- Definition Charge to expense for financing receivables that are expected to be uncollectible. + 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 (c)(2) + Details
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- Definition Reduction to the allowance for credit losses related to collections on financing receivables which have been partially or fully charged off as bad debts. + 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 (c)(4) + Details
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- Definition Reduction to the allowance for credit losses related to financing receivables deemed uncollectible. + 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 (c)(3) + Details
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