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INVESTMENTS (Details) (USD $)
1 Months Ended 12 Months Ended
Aug. 31, 2014
Dec. 31, 2014
Reinsurer
Dec. 31, 2013
Dec. 31, 2012
INVESTMENTS [Abstract]        
Increase in total investments   $ 110,100,000us-gaap_UnrealizedGainOnSecurities    
Percentage increase in investments (in hundredths)   49.90%fnhc_PercentageIncreaseInInvestments    
Increase in gross premiums written   133,800,000fnhc_IncreaseDecreaseInGrossPremiumWritten    
Net proceeds from offering 43,400,000us-gaap_ProceedsFromIssuanceOfCommonStock 43,110,000us-gaap_ProceedsFromIssuanceOfCommonStock 27,879,000us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock
Ratio of available-for-sale securities to total investments (in hundredths)   98.00%fnhc_RatioOfAvailableForSaleSecuritiesToTotalInvestments 97.00%fnhc_RatioOfAvailableForSaleSecuritiesToTotalInvestments  
Net realized investment losses charged to operations   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 44,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Schedule of Available-for-sale Securities [Line Items]        
Bond portfolio reclassified between available-for-sale and held-to-maturity   0fnhc_BondPortfolioReclassifiedBetweenAvailableForSaleAndHeldToMaturity 150,000fnhc_BondPortfolioReclassifiedBetweenAvailableForSaleAndHeldToMaturity  
Number of reinsurers   2fnhc_NumberOfReinsurersThatRequireMaintenanceOfSecurities    
Fair market value of securities required to be maintained by reinsurers   4,900,000fnhc_SecuritiesRequiredToBeMaintainedByReinsurerFairValue    
Fully funded trust agreements maintained in favor of reinsurers   4,900,000fnhc_AmountOfSecuritiesMaintainedInFavorOfReinsurers 4,900,000fnhc_AmountOfSecuritiesMaintainedInFavorOfReinsurers  
Amount held in trust in favor of another reinsurer   1,000,000us-gaap_AssetsHeldInTrust 1,000,000us-gaap_AssetsHeldInTrust  
Debt securities, at market [Abstract]        
Debt securities, at market   284,099,000us-gaap_AvailableForSaleSecuritiesDebtSecurities 174,912,000us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Percent of debt securities at market to total investments (in hundredths)   85.90%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments 79.26%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments  
Debt securities, at amortized cost [Abstract]        
Debt securities, at amortized cost   7,417,000us-gaap_HeldToMaturitySecurities 7,214,000us-gaap_HeldToMaturitySecurities  
Percent of debt securities at amortized cost to total investments (in hundredths)   2.24%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments 3.27%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments  
Total debt securities   291,516,000fnhc_TotalDebtSecurities 182,126,000fnhc_TotalDebtSecurities  
Percent of debt securities to total investments (in hundredths)   88.14%fnhc_PercentOfDebtSecuritiesToTotalInvestments 82.53%fnhc_PercentOfDebtSecuritiesToTotalInvestments  
Equity securities, at market   39,247,000us-gaap_AvailableForSaleSecuritiesEquitySecurities 38,584,000us-gaap_AvailableForSaleSecuritiesEquitySecurities  
Percentage of equity securities to total investments (in hundredths)   11.86%fnhc_PercentageOfEquitySecuritiesToTotalInvestments 17.47%fnhc_PercentageOfEquitySecuritiesToTotalInvestments  
Total investments   330,763,000us-gaap_Investments 220,710,000us-gaap_Investments  
Total investments (in hundredths)   100.00%fnhc_TotalInvestmentsPercentage 100.00%fnhc_TotalInvestmentsPercentage  
Realized gains (losses) [Abstract]        
Total realized gains   5,214,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 4,548,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Fair value at sale of securities with realized gains   68,258,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedGains 53,308,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedGains  
Total realized losses   (788,000)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments (1,667,000)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments  
Fair value at sale of securities with realized losses   13,249,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedLosses 46,803,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedLosses  
Net realized gains on investments   4,426,000us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments 2,881,000us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments  
Fair value of investments at sale   81,507,000us-gaap_PaymentsForProceedsFromInvestments 100,111,000us-gaap_PaymentsForProceedsFromInvestments  
Debt Securities Available For Sale [Abstract]        
Debt Securities - Available-For-Sale, Amortized Cost   281,021,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 174,511,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Debt Securities - Available-For-Sale, Gross Unrealized Gains   3,609,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 1,727,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax  
Debt Securities - Available-For-Sale, Gross Unrealized Losses   531,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax 1,326,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax  
Debt Securities - Available-For-Sale, Estimated Fair Value   284,099,000us-gaap_AvailableForSaleSecuritiesDebtSecurities 174,912,000us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Debt Securities - Held-To-Maturity [Abstract]        
Debt Securities - Held-To-Maturity, Amortized Cost   7,417,000us-gaap_HeldToMaturitySecurities 7,214,000us-gaap_HeldToMaturitySecurities  
Debt Securities - Held-To-Maturity, Gross Unrealized Gains   73,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain 54,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain  
Debt Securities - Held-To-Maturity, Gross Unrealized Losses   231,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss 344,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss  
Debt Securities - Held-To-Maturity, Estimated Fair Value   7,259,000us-gaap_HeldToMaturitySecuritiesFairValue 6,924,000us-gaap_HeldToMaturitySecuritiesFairValue  
Equity securities - common stocks, Estimated Fair Value   39,247,000us-gaap_AvailableForSaleSecuritiesEquitySecurities 38,584,000us-gaap_AvailableForSaleSecuritiesEquitySecurities  
Continuous unrealized loss position [Abstract]        
Debt/Equity securities, Unrealized Losses   1,028,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue    
Debt/Equity securities, Less than 12 months   863,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue    
Debt/Equity securities, 12 months or longer   165,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue    
Amortized Cost [Abstract]        
Due in one year or less, Amortized Cost   16,777,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost 5,161,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one through five years, Amortized Cost   173,236,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost 113,027,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five through ten years, Amortized Cost   98,404,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost 62,656,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years, Amortized Cost   26,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost 881,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Total Amortized Cost   288,443,000fnhc_TotalAvailableForSaleAndHeldToMaturitySecuritiesAmortizedCost 181,725,000fnhc_TotalAvailableForSaleAndHeldToMaturitySecuritiesAmortizedCost  
Estimated Fair Value [Abstract]        
Due in one year or less, Estimated Fair Value   16,797,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue 5,181,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one through five years, Estimated Fair Value   174,273,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue 113,561,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five through ten years, Estimated Fair Value   100,259,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue 62,220,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years, Estimated Fair Value   33,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue 874,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total Estimated Fair Value   291,362,000fnhc_AvailableForSaleAndHeldToMaturityDebtMaturitiesFairValue 181,836,000fnhc_AvailableForSaleAndHeldToMaturityDebtMaturitiesFairValue  
Investment income [Abstract]        
Interest on debt securities   4,775,000us-gaap_InvestmentIncomeInterest 2,850,000us-gaap_InvestmentIncomeInterest 3,380,000us-gaap_InvestmentIncomeInterest
Dividends on equity securities   553,000us-gaap_InvestmentIncomeDividend 478,000us-gaap_InvestmentIncomeDividend 436,000us-gaap_InvestmentIncomeDividend
Interest on cash and cash equivalents   57,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions 4,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions 3,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions
Total investment income   5,385,000us-gaap_InvestmentIncomeInterestAndDividend 3,332,000us-gaap_InvestmentIncomeInterestAndDividend 3,819,000us-gaap_InvestmentIncomeInterestAndDividend
Net realized gains   4,426,000us-gaap_RealizedInvestmentGainsLosses 2,881,000us-gaap_RealizedInvestmentGainsLosses 1,072,000us-gaap_RealizedInvestmentGainsLosses
Proceeds from sales and maturity of marketable securities   87,151,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 106,173,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 90,449,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Net realized and unrealized investment gains (losses) [Abstract]        
Net realized gains (losses)   4,426,000us-gaap_RealizedInvestmentGainsLosses 2,881,000us-gaap_RealizedInvestmentGainsLosses 1,072,000us-gaap_RealizedInvestmentGainsLosses
Net unrealized gains   12,417,000us-gaap_UnrealizedGainLossOnSecurities 9,562,000us-gaap_UnrealizedGainLossOnSecurities  
Federated National [Member]        
INVESTMENTS [Abstract]        
Net proceeds from offering   43,110,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
27,879,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Realized gains (losses) [Abstract]        
Fair value of investments at sale   32,374,000us-gaap_PaymentsForProceedsFromInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,792,000us-gaap_PaymentsForProceedsFromInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
451,000us-gaap_PaymentsForProceedsFromInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Diverse Industries Debt Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Percentage of debt securities to total debt portfolio (in hundredths)   77.00%fnhc_PercentageOfDebtSecuritiesToTotalDebtPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fnhc_DiverseIndustriesDebtSecuritiesMember
83.00%fnhc_PercentageOfDebtSecuritiesToTotalDebtPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fnhc_DiverseIndustriesDebtSecuritiesMember
 
Percentage of equity holdings to total equity portfolio (in hundredths)   88.00%fnhc_PercentageOfEquityHoldingsToTotalEquityPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fnhc_DiverseIndustriesDebtSecuritiesMember
91.00%fnhc_PercentageOfEquityHoldingsToTotalEquityPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fnhc_DiverseIndustriesDebtSecuritiesMember
 
United States Government Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Percentage of debt securities to total debt portfolio (in hundredths)   23.00%fnhc_PercentageOfDebtSecuritiesToTotalDebtPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
17.00%fnhc_PercentageOfDebtSecuritiesToTotalDebtPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
 
Mutual Funds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Percentage of equity holdings to total equity portfolio (in hundredths)   12.00%fnhc_PercentageOfEquityHoldingsToTotalEquityPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fnhc_MutualFundsMember
9.00%fnhc_PercentageOfEquityHoldingsToTotalEquityPortfolio
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fnhc_MutualFundsMember
 
United States Government Obligations and Authorities [Member]        
Debt securities, at market [Abstract]        
Debt securities, at market   62,323,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
27,209,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Percent of debt securities at market to total investments (in hundredths)   18.84%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
12.33%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt securities, at amortized cost [Abstract]        
Debt securities, at amortized cost   4,490,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
4,630,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Percent of debt securities at amortized cost to total investments (in hundredths)   1.36%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
2.10%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities Available For Sale [Abstract]        
Debt Securities - Available-For-Sale, Amortized Cost   61,376,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
27,422,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Gains   1,022,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
186,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Losses   75,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
399,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities - Available-For-Sale, Estimated Fair Value   62,323,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
27,209,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities - Held-To-Maturity [Abstract]        
Debt Securities - Held-To-Maturity, Amortized Cost   4,490,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
4,630,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities - Held-To-Maturity, Gross Unrealized Gains   41,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
32,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities - Held-To-Maturity, Gross Unrealized Losses   225,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
326,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Debt Securities - Held-To-Maturity, Estimated Fair Value   4,306,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
4,336,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Continuous unrealized loss position [Abstract]        
Debt/Equity securities, Unrealized Losses   75,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
   
Debt/Equity securities, Less than 12 months   22,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
   
Debt/Equity securities, 12 months or longer   53,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
   
Obligations of States and Political Subdivisions [Member]        
Debt securities, at market [Abstract]        
Debt securities, at market   91,614,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
52,064,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Percent of debt securities at market to total investments (in hundredths)   27.70%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
23.59%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Debt Securities Available For Sale [Abstract]        
Debt Securities - Available-For-Sale, Amortized Cost   90,728,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
51,883,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Gains   956,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
303,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Losses   70,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
122,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Debt Securities - Available-For-Sale, Estimated Fair Value   91,614,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
52,064,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Continuous unrealized loss position [Abstract]        
Debt/Equity securities, Unrealized Losses   70,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Debt/Equity securities, Less than 12 months   66,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Debt/Equity securities, 12 months or longer   4,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Corporate [Member]        
Debt securities, at market [Abstract]        
Debt securities, at market   119,024,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
91,941,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Percent of debt securities at market to total investments (in hundredths)   35.99%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
41.66%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt securities, at amortized cost [Abstract]        
Debt securities, at amortized cost   2,681,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
2,475,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Percent of debt securities at amortized cost to total investments (in hundredths)   0.81%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
1.12%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities Available For Sale [Abstract]        
Debt Securities - Available-For-Sale, Amortized Cost   117,778,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
91,475,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Gains   1,578,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
1,233,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Losses   332,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
767,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities - Available-For-Sale, Estimated Fair Value   119,024,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
91,941,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity [Abstract]        
Debt Securities - Held-To-Maturity, Amortized Cost   2,681,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
2,475,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity, Gross Unrealized Gains   31,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
22,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity, Gross Unrealized Losses   5,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
17,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity, Estimated Fair Value   2,707,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
2,480,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Continuous unrealized loss position [Abstract]        
Debt/Equity securities, Unrealized Losses   332,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Debt/Equity securities, Less than 12 months   260,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Debt/Equity securities, 12 months or longer   72,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Debt Securities [Member]        
Realized gains (losses) [Abstract]        
Total realized gains   725,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
1,690,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Fair value at sale of securities with realized gains   54,154,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
41,256,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Total realized losses   (147,000)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
(1,001,000)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Fair value at sale of securities with realized losses   11,013,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
43,239,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Continuous unrealized loss position [Abstract]        
Debt/Equity securities, Unrealized Losses   531,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
   
Debt/Equity securities, Less than 12 months   402,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
   
Debt/Equity securities, 12 months or longer   129,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
   
Investment income [Abstract]        
Net realized gains   578,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
689,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
1,392,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Net realized and unrealized investment gains (losses) [Abstract]        
Net realized gains (losses)   578,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
689,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
1,392,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Net unrealized gains   3,078,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
401,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Equity Securities [Member]        
Realized gains (losses) [Abstract]        
Total realized gains   4,489,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
2,858,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Fair value at sale of securities with realized gains   14,104,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
12,052,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Total realized losses   (641,000)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(666,000)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Fair value at sale of securities with realized losses   2,236,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
3,564,000fnhc_FairValueAtSaleOfSecuritiesWithRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Investment income [Abstract]        
Net realized gains   3,848,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
2,192,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(320,000)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Net realized and unrealized investment gains (losses) [Abstract]        
Net realized gains (losses)   3,848,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
2,192,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(320,000)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Net unrealized gains   9,339,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
9,161,000us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
International [Member]        
Debt securities, at market [Abstract]        
Debt securities, at market   11,138,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
3,698,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Percent of debt securities at market to total investments (in hundredths)   3.37%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
1.68%fnhc_PercentOfDebtSecuritiesAtMarketToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt securities, at amortized cost [Abstract]        
Debt securities, at amortized cost   246,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
109,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Percent of debt securities at amortized cost to total investments (in hundredths)   0.07%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
0.05%fnhc_PercentOfDebtSecuritiesAtAmortizedCostToTotalInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities Available For Sale [Abstract]        
Debt Securities - Available-For-Sale, Amortized Cost   11,139,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
3,731,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Gains   53,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
5,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities - Available-For-Sale, Gross Unrealized Losses   54,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
38,000us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities - Available-For-Sale, Estimated Fair Value   11,138,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
3,698,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity [Abstract]        
Debt Securities - Held-To-Maturity, Amortized Cost   246,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
109,000us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity, Gross Unrealized Gains   1,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
0us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity, Gross Unrealized Losses   1,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
1,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Debt Securities - Held-To-Maturity, Estimated Fair Value   246,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
108,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
 
Continuous unrealized loss position [Abstract]        
Debt/Equity securities, Unrealized Losses   54,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
   
Debt/Equity securities, Less than 12 months   54,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
   
Debt/Equity securities, 12 months or longer   0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignCorporateDebtSecuritiesMember
   
Common Stock [Member]        
Debt securities, at amortized cost [Abstract]        
Equity securities, at market   39,247,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
38,584,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
 
Debt Securities - Held-To-Maturity [Abstract]        
Equity securities - common stocks, Amortized Cost   29,908,000us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
29,423,000us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
 
Equity securities - common stocks, Gross Unrealized Gains   9,836,000us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
9,436,000us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
 
Equity securities - common stocks, Gross Unrealized Losses   497,000us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
275,000us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
 
Equity securities - common stocks, Estimated Fair Value   39,247,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
38,584,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
 
Continuous unrealized loss position [Abstract]        
Debt/Equity securities, Unrealized Losses   497,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
Debt/Equity securities, Less than 12 months   461,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
Debt/Equity securities, 12 months or longer   36,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
United States Treasury Notes [Member] | Federated National [Member]        
Amortized Cost [Abstract]        
Due in one year or less, Amortized Cost   61,465us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryNotesSecuritiesMember
   
Due after one through five years, Amortized Cost     2,208,588us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryNotesSecuritiesMember
 
United States Treasury Notes [Member] | American Vehicle [Member]        
Amortized Cost [Abstract]        
Due in one year or less, Amortized Cost   62,490us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryNotesSecuritiesMember
   
Due after one through five years, Amortized Cost     $ 2,193,814us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryNotesSecuritiesMember