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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Investment [Line Items] |  |
Estimated fair value less than 12 months | $ 8,700 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | $ 101,792 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Estimated fair value 12 months or more | 13,833 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 3,554 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Estimated fair value total | 22,533 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 105,346 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Unrealized losses, 12 months or more | 183 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | 262 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Unrealized losses, less than 12 months | 15 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses | 2,661 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
Unrealized losses, total | 198 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses | 2,923 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Estimated fair value less than 12 months | 8,700 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 101,792 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Estimated fair value 12 months or more | 13,833 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 3,554 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Estimated fair value total | 22,533 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 105,346 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized losses, 12 months or more | 183 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 262 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized losses, less than 12 months | 15 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 2,661 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized losses, total | 198 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 2,923 us-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 |  |

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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