| Document and Entity Information | May 21, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | CenterState Bank Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001102266 |
| Document Type | 8-K |
| Document Period End Date | May 21, 2020 |
| Entity Incorporation State Country Code | FL |
| Entity File Number | 000-32017 |
| Entity Tax Identification Number | 59-3606741 |
| Entity Address, Address Line One | 1101 First Street South |
| Entity Address, Address Line Two | Suite 202 |
| Entity Address, City or Town | Winter Haven |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33880 |
| City Area Code | (863) |
| Local Phone Number | 293-4710 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock |
| Trading Symbol | CSFL |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
