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Schedule V Valuation and Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Loan and Lease Losses, Real Estate [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance, Beginning Balance $ 11,800,000 $ 6,200,000 $ 5,800,000
Valuation Allowances and Reserves, Charged to Cost and Expense 6,300,000 9,500,000 7,400,000
Valuation Allowances and Reserves, Charged to Other Accounts 0 0 0
Valuation Allowances and Reserves, Deductions 6,500,000 3,900,000 7,000,000
Valuation Allowances and Reserves, Balance, Ending Balance 11,600,000 11,800,000 6,200,000
Valuation Allowance of Deferred Tax Assets [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance, Beginning Balance 8,600,000 3,900,000 3,500,000
Valuation Allowances and Reserves, Charged to Cost and Expense 0 0 0
Valuation Allowances and Reserves, Charged to Other Accounts 1,600,000 5,400,000 3,200,000
Valuation Allowances and Reserves, Deductions 100,000 700,000 2,800,000
Valuation Allowances and Reserves, Balance, Ending Balance $ 10,100,000 $ 8,600,000 $ 3,900,000