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Stock Plans - Average Assumptions Used To Value Option Awards (Details) (USD$) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Stock Plans - Average Assumptions Used To Value Option Awards Details Usd    
Weighted average grant date fair value $ 3.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 2.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Expected dividend yield 1.91%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 3.12%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Expected volatility 28.01%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 28.74%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Risk free interest rate 1.94%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 2.02%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected term (years) 10 years 10 years
Expected forfeiture 0.00%UNAM_ShareBasedCompensationArrangementbyShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate 0.00%UNAM_ShareBasedCompensationArrangementbyShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate