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Investments (Details 1) (Municipal Bonds [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Municipal Bonds [Member] |  |
Net Investment Income [Line Items] |  |
Unrealized Gains | $ 1,245 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | $ 1,279 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Unrealized Losses | $ (49)us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | $ (50)us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember

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- Definition Amount of unrecognized gain before loss on investments in held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of unrecognized loss before gain on investments in held-to-maturity securities. Excludes write-down for other than temporary impairment (OTTI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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