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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)