| Cover | Oct. 18, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 17, 2024 |
| Entity Registrant Name | Home Bancorp, Inc. |
| Entity Incorporation, State or Country Code | LA |
| Entity File Number | 001-34190 |
| Entity Tax Identification Number | 71-1051785 |
| Entity Address, Address Line One | 503 Kaliste Saloom Road |
| Entity Address, City or Town | Lafayette |
| Entity Address, State or Province | LA |
| Entity Address, Postal Zip Code | 70508 |
| City Area Code | 337 |
| Local Phone Number | 237-1960 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | HBCP |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001436425 |
| Amendment Flag | false |
