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Investments (Details 20) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financing Receivable Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance $ 45,066,000   $ 45,066,000   $ 61,812,000
Impaired Financing Receivable Recorded Investment 44,394,000   44,394,000   60,904,000
Impaired Financing Receivable Related Allowance 8,343,000   8,343,000   8,188,000
Impaired Financing Receivable Net Of Related Allowance 36,051,000   36,051,000   52,716,000
Impaired Financing Receivable, Average Recorded Investment 46,101,000 36,057,000 52,490,000 36,274,000  
Impaired Financing Receivable Interest Income Accrual Method 570,000 234,000 1,485,000 780,000  
Commercial Real Estate Other Receivable With No Related Allowance [Member]
          
Financing Receivable Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 13,127,000   13,127,000   32,088,000
Impaired Financing Receivable Recorded Investment 12,585,000   12,585,000   31,496,000
Impaired Financing Receivable Related Allowance 0   0   0
Impaired Financing Receivable Net Of Related Allowance 12,585,000   12,585,000   31,496,000
Impaired Financing Receivable, Average Recorded Investment 11,054,000 4,706,000 16,312,000 11,228,000  
Impaired Financing Receivable Interest Income Accrual Method 109,000 32,000 305,000 102,000  
Commercial Real Estate Other Receivable With Related Allowance [Member]
          
Financing Receivable Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 31,939,000   31,939,000   29,724,000
Impaired Financing Receivable Recorded Investment 31,809,000   31,809,000   29,408,000
Impaired Financing Receivable Related Allowance 8,343,000   8,343,000   8,188,000
Impaired Financing Receivable Net Of Related Allowance 23,466,000   23,466,000   21,220,000
Impaired Financing Receivable, Average Recorded Investment 35,047,000 31,351,000 36,178,000 25,046,000  
Impaired Financing Receivable Interest Income Accrual Method $ 461,000 $ 202,000 $ 1,180,000 $ 678,000