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1. Basis of Presentation and Use of Estimates Immaterial Errors Related to Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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 | $ 27,422 | $ 65,448 | $ 12,663 | $ 15,495
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 | 15,967 | 38,108 | 7,373 | 9,022
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 | (4,084) | (5,045) | 104 | (385)
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 | (2,378) | (2,937) | 61 | (224)
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 | (4,756) | (5,874) | 121 | (448)
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 | (8,168) | (10,090) | 208 | (770)
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 | (4,756) | (5,874) | 121 | (448)
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 | $ (8,168) | $ (10,090) | $ 208 | $ (770)

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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=6369664&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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