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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 |

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