XML 74 R59.htm IDEA: XBRL DOCUMENT v3.25.0.1
Investments (Additional Information) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]          
Trading securities     $ 5,243,000 $ 4,647,000  
AFS debt securities, allowance     0 0  
Net unrealized loss on debt securities, net of tax     62,200,000 60,500,000  
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross       16,600,000  
Deferred Tax Liabilities, Investments     17,000,000.0    
Debt Securities, Held-to-Maturity, Excluded Accrued Interest from Amortized Cost     1,600,000 1,700,000 $ 0
Security Owned And Pledged As Collateral Amortized Cost     519,900,000 675,500,000  
Debt Securities, Held-to-Maturity, Credit Loss Expense (Reversal)   $ 1,800,000 (910,000) 1,838,000  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Writeoff     0 (1,838,000)  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Recovery     910,000 0  
Asset Pledged as Collateral          
Schedule of Investments [Line Items]          
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value     449,000,000.0 607,900,000  
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     41,800,000 46,900,000  
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross     11,400,000 12,800,000  
Available-for-sale Securities          
Schedule of Investments [Line Items]          
Interest Receivable     $ 1,700,000 $ 1,700,000  
Signature Bank Corporate Bond          
Schedule of Investments [Line Items]          
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Writeoff   $ 8,000