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Investments (Details 18) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | $ 40,566,000 | $ 61,812,000 |
Impaired Financing Receivable, Recorded Investment | 39,956,000 | 60,904,000 |
Impaired Financing Receivable, Related Allowance | 6,980,000 | 8,188,000 |
Loans And Leases Receivable Impaired At Carrying Value 1 | 32,976,000 | 52,716,000 |
Impaired Financing Receivable, Average Recorded Investment | 49,983,000 | 42,589,000 | 41,178,000
Impaired Financing Receivable, Interest Income, Accrual Method | 1,669,000 | 1,048,000 | 820,000
Commercial Real Estate Other Receivable With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 13,039,000 | 32,088,000 |
Impaired Financing Receivable, Recorded Investment | 12,496,000 | 31,496,000 |
Impaired Financing Receivable, Related Allowance | 0 | 0 |
Loans And Leases Receivable Impaired At Carrying Value 1 | 12,496,000 | 31,496,000 |
Impaired Financing Receivable, Average Recorded Investment | 15,549,000 | 14,877,000 | 19,253,000
Impaired Financing Receivable, Interest Income, Accrual Method | 1,244,000 | 630,000 | 525,000
Commercial Real Estate Other Receivable With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 27,527,000 | 29,724,000 |
Impaired Financing Receivable, Recorded Investment | 27,460,000 | 29,408,000 |
Impaired Financing Receivable, Related Allowance | 6,980,000 | 8,188,000 |
Loans And Leases Receivable Impaired At Carrying Value 1 | 20,480,000 | 21,220,000 |
Impaired Financing Receivable, Average Recorded Investment | 34,434,000 | 27,712,000 | 21,925,000
Impaired Financing Receivable, Interest Income, Accrual Method | $ 425,000 | $ 418,000 | $ 295,000

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- Definition Reflects the adjusted carrying amount of loans for which it is probable, based on current facts and circumstances, that a creditor will not initially be able to collect all amounts due according to the contractual terms of the loan agreement, or will not recover the previously reported carrying amount of the loan. + References No definition available. + Details
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- Definition The average recorded investment related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(1) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5258-111524 + Details
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- Definition The interest income recognized during the time within that period that the financing receivables were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(2) + Details
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- Definition The recorded investment related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953550-111524 -Subparagraph (b) + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (a)(3) + Details
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- Definition The unpaid principal balance related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 + Details
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