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Deposits (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Affiliate company deposits | Assets pledged as collateral    
Cash and Cash Equivalents    
Deposit liabilities uninsured by FDIC $ 0.7  
Retail accounts    
Cash and Cash Equivalents    
Percentage of deposit held 42.80%  
Commercial accounts    
Cash and Cash Equivalents    
Percentage of deposit held 34.70%  
Municipal relationships    
Cash and Cash Equivalents    
Percentage of deposit held 14.40%  
Municipal relationships | Collateralized by letters of credit    
Cash and Cash Equivalents    
Letters of credit pledged as collateral $ 292.9  
Brokered deposits    
Cash and Cash Equivalents    
Percentage of deposit held 8.10%  
Deposit uninsured by FDIC    
Cash and Cash Equivalents    
Deposit liabilities uninsured by FDIC $ 744.7 $ 883.5
Percentage of deposit held 24.30% 26.90%