| Document and Entity Information | Jan. 25, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001598665 |
| Document Type | 8-K |
| Document Period End Date | Jan. 25, 2021 |
| Entity Registrant Name | HERITAGE INSURANCE HOLDINGS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36462 |
| Entity Tax Identification Number | 45-5338504 |
| Entity Address, Address Line One | 2600 McCormick Drive |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Clearwater |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33759 |
| City Area Code | (727) |
| Local Phone Number | 362-7202 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.0001 per share |
| Trading Symbol | HRTG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
