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Investments (Details 4) (USD $)
Dec. 31, 2012
CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAbstract  
CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesOutstandingBalance $ 108,831,000
CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesCarryingAmountNet $ 84,765,000