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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Investment [Line Items]    
Estimated fair value, less than 12 months $ 8,354us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue $ 8,700us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Estimated fair value, 12 months or more 1,220us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 13,833us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Estimated fair value, total 9,574us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 22,533us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Unrealized losses, 12 months or more 40us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 15us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Unrealized losses, less than 12 months 21us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses 183us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
Unrealized losses, total 61us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses 198us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
State and Political Subdivisions [Member]    
Investment [Line Items]    
Estimated fair value, less than 12 months 8,354us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 8,700us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Estimated fair value, 12 months or more 1,220us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 13,833us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Estimated fair value, total 9,574us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 22,533us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized losses, 12 months or more 40us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 15us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized losses, less than 12 months 21us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 183us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized losses, total 61us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 198us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Certificates Of deposit [Member]    
Investment [Line Items]    
Estimated fair value, less than 12 months      
Estimated fair value, 12 months or more      
Estimated fair value, total      
Unrealized losses, 12 months or more      
Unrealized losses, less than 12 months      
Unrealized losses, total