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Investment Securities - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Investments in an unrealized loss position    
Amount of pretax loss if securities in an unrealized loss position are sold $ 34.4  
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings    
Investments in an unrealized loss position    
Amortized cost $ 224.6 $ 247.4