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Other Borrowings - Subordinated Debt and Notes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other Borrowings    
Subordinated debentures redeemed $ 39.9  
CenterState Bank Corporation subordinated debt    
Other Borrowings    
Subordinated Debt   $ 200.0
Debt issuance cost $ 3.1 3.1
Subordinated Debt.    
Other Borrowings    
Subordinated Debt   $ 209.9
Discount amortization period 7 years 6 months  
Weighted average cost of the subordinated debt 5.80% 5.78%
Weighted average cost year to date 5.81% 5.69%
Subordinated debt qualify for Tier 2 $ 213.0  
Subordinated debt do not qualify for Tier 2 11.0  
Subordinated debentures redeemed 25.0  
Subordinate notes matured $ 11.0  
Subordinated Debt net of discount    
Other Borrowings    
Weighted average cost year to date 6.06% 5.93%