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Deposits (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Affiliate company deposits | Assets pledged as collateral    
Cash and Cash Equivalents    
Deposit liabilities uninsured by FDIC $ 0.2  
Retail accounts    
Cash and Cash Equivalents    
Percentage of deposit held 41.00%  
Commercial accounts    
Cash and Cash Equivalents    
Percentage of deposit held 32.80%  
Municipal relationships    
Cash and Cash Equivalents    
Percentage of deposit held 18.10%  
Municipal relationships | Collateralized by letters of credit    
Cash and Cash Equivalents    
Letters of credit pledged as collateral $ 475.7  
Brokered deposits    
Cash and Cash Equivalents    
Percentage of deposit held 8.10%  
Deposit uninsured by FDIC    
Cash and Cash Equivalents    
Percentage of deposit held 28.40% 36.90%
Deposit liabilities uninsured by FDIC $ 955.9 $ 1,100.0