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Derivatives and Hedging Activities - Derivatives (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Cumulative basis adjustments for fair value hedges      
Amortized cost of the Hedged Assets $ 3,109,057   $ 3,242,878
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Fair Value   Fair Value
Amortized Cost of Fair Value Hedging Included in the Carrying Amount of the Hedged Assets $ (5,130)   $ (9,287)
Interest rate swap      
Notional and estimated fair value amount of derivative positions      
Notional Amount 1,630,500   1,630,500
Asset Derivative 5,130   9,287
Liability Derivative $ 0   $ 0
Remaining Maturity 10 months 24 days   1 year 2 months 12 days
Pay Rate 3.68%   3.68%
Interest rate swap | Interest income on investment securities      
Fair value hedge relationships on the income statement      
Gain (loss) on fair value hedges recognized in earnings $ (1,459) $ 19,600  
Debt securities available-for-sale | Interest income on investment securities      
Fair value hedge relationships on the income statement      
Gain (loss) on fair value hedges recognized in earnings $ 4,157 $ (16,777)