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ORGANIZATION AND BUSINESS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Agent
Dec. 31, 2013
Business Organization [Line Item]    
Years in business (minimum) 23 years  
Number of independent agents 3,600fnhc_NumberOfIndependentAgents  
Number of agents that actively sell and service the entity's products 2,300fnhc_NumberOfAgentsThatActivelySellAndServiceEntitySProducts  
Commission fee as percentage of gross written premium (in hundredths) 4.00%fnhc_CommissionFeeAsPercentageOfGrossWrittenPremium  
Maximum number of days from the policy inception MGA has the right to cancel any policy 90 days  
Number of days notice to cancel any policy for MGA 25 days  
Number of days after policy inception MGA has right to cancel any policy 90 days  
Number of days of notice after policy inception MGA has the right to cancel any policy 95 days  
Ratio of homeowners' premiums underwritten to total premiums underwritten (in hundredths) 91.40%fnhc_RatioOfHomeownersPremiumsUnderwrittenToTotalPremiumsUnderwritten 89.60%fnhc_RatioOfHomeownersPremiumsUnderwrittenToTotalPremiumsUnderwritten
Ratio of commercial general liability premiums underwritten to total premiums underwritten (in hundredths) 3.30%fnhc_RatioOfCommercialGeneralLiabilityPremiumsUnderwrittenToTotalPremiumsUnderwritten 4.30%fnhc_RatioOfCommercialGeneralLiabilityPremiumsUnderwrittenToTotalPremiumsUnderwritten
Ratio of federal flood premiums underwritten to total premiums underwritten (in hundredths) 2.00%fnhc_RatioOfFederalFloodPremiumsUnderwrittenToTotalPremiumsUnderwritten 2.60%fnhc_RatioOfFederalFloodPremiumsUnderwrittenToTotalPremiumsUnderwritten
Ratio of automobile insurance premiums underwritten to total premiums underwritten (in hundredths) 3.30%fnhc_RatioOfAutomobileInsurancePremiumsUnderwrittenToTotalPremiumsUnderwritten 3.50%fnhc_RatioOfAutomobileInsurancePremiumsUnderwrittenToTotalPremiumsUnderwritten
Homeowners' gross premiums written $ 344,900,000fnhc_DirectAndAssumedPremiumsWrittenPropertyAndCasualtyHomeowners  
Portion of homeowners' gross premium written produced under the agreement with "ISA" 39,600,000fnhc_PortionOfHomeownersGrossPremiumWrittenProducedUnderAgreementWithIsa  
Percentage of homeowners' gross premium written produced under the agreement with "ISA" (in hundredths) 11.00%fnhc_PercentageOfHomeownersGrossPremiumWrittenProducedUnderAgreementWithIsa  
Percentage of total increase in sale of homeowners' policy (in hundredths) 31.00%fnhc_PercentageOfTotalIncreaseInSalesOfHomeownerPolicy  
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