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1. Significant Accounting Policies Immaterial Errors Related to Presentation (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Net Unrealized Holding Gain (Loss) Net Of Income Tax [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | $ 65,448,000 | $ 12,663,000
Income Tax On Net Unrealized Holding Gain (Loss) [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | 38,108,000 | 7,373,000
Reclassification Adjustments For Net Holding (Gain) Loss Net Of Income Tax [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | (5,045,000) | 104,000
Income Tax on Reclassification Adjustments For Net Holding (Gain) Loss [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | (2,937,000) | 61,000
Income Tax on Reclassification Adjustments For Net Holding (Gain) Loss [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | (5,874,000) | 121,000
Reclassification Adjustments For Net Holding (Gain) Loss Net Of Income Tax [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | (10,090,000) | 208,000
Income Tax On Net Unrealized Holding Gain (Loss) [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | (5,874,000) | 121,000
Net Unrealized Holding Gain (Loss) Net Of Income Tax [Member] |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | $ (10,090,000) | $ 208,000

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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 1.N.Q3) -URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 1 -Section N + Details
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