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Other Borrowings - Subordinated Debt and Notes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
CenterState Bank Corporation subordinated debt    
Other Borrowings    
Subordinated Debt $ 200,000  
Debt issuance cost 3,100  
Subordinated Debt    
Other Borrowings    
Subordinated Debt 245,900 $ 0
Debt issuance cost $ 3,146  
Discount amortization period 8 years 6 months  
Weighted average cost of the subordinated debt 5.78%  
Weighted average cost year to date 5.69%  
Subordinated debt qualify for Tier 2 $ 238,000  
Subordinated debt do not qualify for Tier 2 $ 11,000  
Subordinated Debt net of discount    
Other Borrowings    
Weighted average cost year to date 5.93%