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Organization and Business (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Carrier
Agent
Mar. 31, 2014
Business Organization [Line Item]    
Years in business (minimum) 23 years  
Number of independent agents 3,800fnhc_NumberOfIndependentAgents  
Number of agents that actively sell and service the entity's products 2,300fnhc_NumberOfAgentsThatActivelySellAndServiceEntitySProducts  
Ratio of homeowners' premiums underwritten to total premiums underwritten (in hundredths) 91.70%fnhc_RatioOfHomeownersPremiumsUnderwrittenToTotalPremiumsUnderwritten 91.20%fnhc_RatioOfHomeownersPremiumsUnderwrittenToTotalPremiumsUnderwritten
Ratio of commercial general liability premiums underwritten to total premiums underwritten (in hundredths) 3.70%fnhc_RatioOfCommercialGeneralLiabilityPremiumsUnderwrittenToTotalPremiumsUnderwritten 3.90%fnhc_RatioOfCommercialGeneralLiabilityPremiumsUnderwrittenToTotalPremiumsUnderwritten
Ratio of federal flood premiums underwritten to total premiums underwritten (in hundredths) 1.40%fnhc_RatioOfFederalFloodPremiumsUnderwrittenToTotalPremiumsUnderwritten 1.90%fnhc_RatioOfFederalFloodPremiumsUnderwrittenToTotalPremiumsUnderwritten
Ratio of automobile insurance premiums underwritten to total premiums underwritten (in hundredths) 3.20%fnhc_RatioOfAutomobileInsurancePremiumsUnderwrittenToTotalPremiumsUnderwritten 3.00%fnhc_RatioOfAutomobileInsurancePremiumsUnderwrittenToTotalPremiumsUnderwritten
Portion of homeowners' gross premium written produced under the agreement with "ISA" $ 19,700,000fnhc_PortionOfHomeownersGrossPremiumWrittenProducedUnderAgreementWithIsa $ 11,600,000fnhc_PortionOfHomeownersGrossPremiumWrittenProducedUnderAgreementWithIsa
Percentage of homeowners' gross premium written produced under the agreement with "ISA" (in hundredths) 20.10%fnhc_PercentageOfHomeownersGrossPremiumWrittenProducedUnderAgreementWithIsa 15.70%fnhc_PercentageOfHomeownersGrossPremiumWrittenProducedUnderAgreementWithIsa
Homeowners' gross premiums written 97,800,000fnhc_DirectAndAssumedPremiumsWrittenPropertyAndCasualtyHomeowners 74,000,000fnhc_DirectAndAssumedPremiumsWrittenPropertyAndCasualtyHomeowners
Percentage of total increase in sale of Homeowners' policy related to ISA (in hundredths) 82.60%fnhc_PercentageOfTotalIncreaseInSalesOfHomeownerPolicy  
Number of carriers the entity provides insurance through 40fnhc_NumberOfCarriersEntityProvidesInsuranceThrough  
Original percentage commission fee from its affiliate (in hundredths) 4.00%fnhc_OriginalPercentageCommissionFeeFromItsAffiliate  
Minimum [Member]    
Business Organization [Line Item]    
Fees earned per policy 25us-gaap_InsuranceCommissionsAndFees
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]    
Business Organization [Line Item]    
Fees earned per policy $ 55us-gaap_InsuranceCommissionsAndFees
/ us-gaap_RangeAxis
= us-gaap_MaximumMember