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USD ($)
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 -Paragraph 32
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 157
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USD ($)
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1/1/2011 - 3/31/2011
USD ($)
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{pre_FairValueByAssetClassAxis} : Equity securities [Member]
1/1/2010 - 3/31/2010
USD ($)
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 -Name Statement of Financial Accounting Standard (FAS)
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USD ($)
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 -Number 157
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 -Number 157
 -Paragraph 32
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 -Paragraph 32
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 -Name Statement of Financial Accounting Standard (FAS)
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USD ($)
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3/31/2011
USD ($)
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12/31/2010
USD ($)
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 -Paragraph 13, 16
 -Article 9

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3/31/2011
USD ($)
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12/31/2010
USD ($)
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3/31/2011
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USD ($)
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