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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 |

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