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Derivative Activities (Maturity Years of Swaptions tied to S&P) (Details) - Swaption Member
Dec. 31, 2015
USD ($)
ContractReceivableAbstract  
Contract Receivable Due One Year Or Less $ 3,375,000
Contract Receivable, Total 3,375,000
PurchaseObligationFiscalYearMaturityAbstract  
Purchase Obligation Due In Next Twelve Months 3,152,000
Purchase Obligation, Total $ 3,152,000