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Borrowed Funds - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]          
Total long-term borrowings $ 539,700   $ 539,700   $ 534,800
Total short-term borrowings 1,760,000   1,760,000   1,440,000
FRBNY BTFP Borrowing 550,000   550,000   450,000
Available for sale debt securities, at fair value 2,626,783   2,626,783   1,690,112
Interest expense, borrowings 20,800 $ 14,100 38,200 $ 21,600  
Amortization related to purchase accounting on FHLB advances 276   276    
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase          
Debt Instrument [Line Items]          
Available for sale debt securities, at fair value 1,080,000   1,080,000   924,600
Asset Pledged as Collateral | Federal Funds Purchased          
Debt Instrument [Line Items]          
Available for sale debt securities, at fair value $ 569,400   $ 569,400   $ 589,100