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Investments (Details 18) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Financing Receivable Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance $ 41,777,000   $ 40,566,000
Impaired Financing Receivable Recorded Investment 41,167,000   39,956,000
Impaired Financing Receivable Related Allowance 6,008,000   6,980,000
Impaired Financing Receivable Net Of Related Allowance 35,159,000   32,976,000
Impaired Financing Receivable, Average Recorded Investment 46,101,000 36,057,000  
Impaired Financing Receivable Interest Income Accrual Method 570,000 234,000  
Commercial Real Estate Other Receivable With No Related Allowance [Member]
      
Financing Receivable Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 14,802,000   13,039,000
Impaired Financing Receivable Recorded Investment 14,259,000   12,496,000
Impaired Financing Receivable Related Allowance 0   0
Impaired Financing Receivable Net Of Related Allowance 14,259,000   12,496,000
Impaired Financing Receivable, Average Recorded Investment 11,054,000 4,706,000  
Impaired Financing Receivable Interest Income Accrual Method 109,000 32,000  
Commercial Real Estate Other Receivable With Related Allowance [Member]
      
Financing Receivable Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 26,975,000   27,527,000
Impaired Financing Receivable Recorded Investment 26,908,000   27,460,000
Impaired Financing Receivable Related Allowance 6,008,000   6,980,000
Impaired Financing Receivable Net Of Related Allowance 20,900,000   20,480,000
Impaired Financing Receivable, Average Recorded Investment 35,047,000 31,351,000  
Impaired Financing Receivable Interest Income Accrual Method $ 461,000 $ 202,000