Refers to percentage of quota share reinsurance treaty.

No definition available.

Name:	fnhc_PercentageOfQuotaShareReinsuranceTreaty
Namespace Prefix:	fnhc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-18)
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_ReinsurancePolicyTypeAxis=fnhc_QuotaShareTreatiesMember
Namespace Prefix:
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- Details

Name:	us-gaap_ProductOrServiceAxis=us-gaap_PropertyInsuranceProductLineMember
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LOSS AND LOSS ADJUSTMENT RESERVES (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Jul. 01, 2017	Jul. 31, 2016	Mar. 31, 2019	Mar. 31, 2018
Liability for Future Policy Benefit, by Product Segment [Line Items]
Claim and claim adjustment expenses incurred related to current year			$ 67,048	$ 48,459
Claim and claim adjustment expenses incurred related to prior year			(209)	(2,388)
Reinsurance Programs \| Florida
Liability for Future Policy Benefit, by Product Segment [Line Items]
Claim and claim adjustment expenses incurred related to current year			$ 700	$ (700)
Quota Share Treaties \| Florida \| Property Insurance Product Line
Liability for Future Policy Benefit, by Product Segment [Line Items]
Percentage of property quota share reinsurance treaty	10.00%	30.00%