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Investments (Details 15) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | $ 48,490 |  | $ 48,490 |  | $ 61,812
Impaired Financing Receivable Recorded Investment | 47,808 |  | 47,808 |  | 60,904
Impaired Financing Receivable Related Allowance | 6,959 |  | 6,959 |  | 8,188
Impaired Financing Receivable Net Of Related Allowance | 40,849 |  | 40,849 |  | 52,716
Impaired Financing Receivable, Average Recorded Investment | 52,332 | 36,628 | 55,189 | 36,301 |
Impaired Financing Receivable Interest Income Accrual Method | 438 | 260 | 915 | 546 |
Commercial Real Estate Other Receivable With No Related Allowance [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 10,066 |  | 10,066 |  | 32,088
Impaired Financing Receivable Recorded Investment | 9,523 |  | 9,523 |  | 31,496
Impaired Financing Receivable Related Allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable Net Of Related Allowance | 9,523 |  | 9,523 |  | 31,496
Impaired Financing Receivable, Average Recorded Investment | 10,585 | 12,720 | 17,555 | 14,114 |
Impaired Financing Receivable Interest Income Accrual Method | 28 | 51 | 197 | 93 |
Commercial Real Estate Other Receivable With Related Allowance [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 38,424 |  | 38,424 |  | 29,724
Impaired Financing Receivable Recorded Investment | 38,285 |  | 38,285 |  | 29,408
Impaired Financing Receivable Related Allowance | 6,959 |  | 6,959 |  | 8,188
Impaired Financing Receivable Net Of Related Allowance | 31,326 |  | 31,326 |  | 21,220
Impaired Financing Receivable, Average Recorded Investment | 41,747 | 23,908 | 37,634 | 22,187 |
Impaired Financing Receivable Interest Income Accrual Method | $ 410 | $ 209 | $ 718 | $ 453 |

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