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USD ($)

USD ($) / shares
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USD ($)

USD ($) / shares
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1/1/2011 - 3/31/2011
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_InvestmentTypeAxis} : GNMA pass-through certificates [Member]
1/1/2011 - 3/31/2011
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_InvestmentTypeAxis} : FNMA pass-through certificates [Member]
1/1/2011 - 3/31/2011
USD ($)
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{us-gaap_InvestmentTypeAxis} : FNMA pass-through certificates [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_InvestmentTypeAxis} : FHLMC pass-through certificates [Member]
1/1/2011 - 3/31/2011
USD ($)
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{us-gaap_InvestmentTypeAxis} : FHLMC pass-through certificates [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_InvestmentTypeAxis} : FHLMC and FNMA - REMICs [Member]
1/1/2011 - 3/31/2011
USD ($)
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{us-gaap_InvestmentTypeAxis} : FHLMC and FNMA - REMICs [Member]
1/1/2010 - 12/31/2010
USD ($)
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1/1/2011 - 3/31/2011
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : United States government-sponsored enterprise securities [Member]
1/1/2011 - 3/31/2011
USD ($)
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{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : United States government-sponsored enterprise securities [Member]
1/1/2010 - 12/31/2010
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 115
 -Paragraph 20

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 115
 -Paragraph 19

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 115
 -Paragraph 137

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/><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 115
 -Paragraph 19

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 115
 -Paragraph 137

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