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USD ($)
USD ($) / shares
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USD ($)
USD ($) / shares
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USD ($)
USD ($) / shares
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12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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12/31/2010
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
$D2009_ResidentialMortgageBackedSecuritiesMemberhttp://www.sec.gov/CIK0000018230duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseResidential mortgage-backed securitiesus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$19falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Residential mortgage-backed securities
1/1/2008 - 12/31/2008
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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