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Investments (Additional Information) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2020
Schedule of Investments [Line Items]        
Trading securities   $ 4,647,000 $ 3,990,000  
AFS debt securities, allowance   0 0 $ 0
Net unrealized loss on debt securities, net of tax   (60,500,000) 79,400,000  
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross     21,700,000  
Deferred Tax Liabilities, Investments   16,600,000    
Debt Securities, Held-to-Maturity, Excluded Accrued Interest from Amortized Cost   1,700,000    
Security Owned And Pledged As Collateral Amortized Cost   675,500,000 821,900,000  
Debt Securities, Held-to-Maturity, Credit Loss Expense (Reversal)   1,838,000 0  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Writeoff   (1,838,000) 0  
Proceeds, Debt Securities, Held-to-Maturity, Previously Written off, Recovery   910,000    
Asset Pledged as Collateral        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value   607,900,000 726,500,000  
Transferred Securities        
Schedule of Investments [Line Items]        
AFS debt securities, fair value, transfer amount $ 520,300,000      
AFS debt securities, transfer, unrealized loss $ 72,100,000      
Net unrealized loss on debt securities, net of tax   46,900,000    
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross   12,800,000    
Available-for-sale Securities        
Schedule of Investments [Line Items]        
Interest Receivable   1,700,000 $ 1,900,000  
Signature Bank Corporate Bond        
Schedule of Investments [Line Items]        
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Writeoff   $ 8,000