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Borrowed Funds - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Long term borrowings $ 513,900,000 $ 534,800,000  
Short term borrowings 1,510,000,000 1,440,000,000  
Available for sale debt securities, at fair value 2,768,915,000 1,690,112,000  
Interest expense on borrowings 74,900,000 56,000,000 $ 9,500,000
Amortization related to purchase accounting on FHLB advances (1,400,000) (105,000) $ (188,000)
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase      
Debt Instrument [Line Items]      
Available for sale debt securities, at fair value 1,120,000,000 924,600,000  
Asset Pledged as Collateral | Federal Funds Purchased      
Debt Instrument [Line Items]      
Available for sale debt securities, at fair value $ 0 $ 589,100,000