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NET INCOME PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income (Numerator) [Abstract]      
Basic net income $ 37,199us-gaap_NetIncomeLoss $ 12,727us-gaap_NetIncomeLoss $ 4,313us-gaap_NetIncomeLoss
Fully diluted income $ 37,199fnhc_FullyDilutedIncomeLoss $ 12,727fnhc_FullyDilutedIncomeLoss $ 4,313fnhc_FullyDilutedIncomeLoss
Shares Outstanding (Denominator) [Abstract]      
Basic net income per share (in shares) 12,082,269us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 8,505,967us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,951,906us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Fully diluted income per share (in shares) 12,438,418us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 8,772,060us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 8,016,110us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per-share Amount [Abstract]      
Basic net income per share (in dollars per share) $ 3.08us-gaap_EarningsPerShareBasic $ 1.50us-gaap_EarningsPerShareBasic $ 0.53us-gaap_EarningsPerShareBasic
Fully diluted income per share (in dollars per share) $ 2.99us-gaap_EarningsPerShareDiluted $ 1.45us-gaap_EarningsPerShareDiluted $ 0.53us-gaap_EarningsPerShareDiluted