Derivative Instruments and Hedging Activities - Schedule of the Carrying Amount and Associated Cumulative Basis Adjustment Related to the Application of Hedge Accounting (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value Hedges | Interest-bearing deposits
Derivative [Line Items]
Hedge Accounting Basis Adjustment	$ 2,067	$ 12,057
Fair Value Hedges | Long-term debt
Derivative [Line Items]
Hedge Accounting Basis Adjustment	1,918	$ 3,952
Interest Rate Contract | Interest-bearing deposits | Derivatives not designated as hedging instruments
Derivative [Line Items]
Hedge Accounting Basis Adjustment	866		$ 1,267
Interest Rate Contract | Long-term debt | Derivatives not designated as hedging instruments
Derivative [Line Items]
Hedge Accounting Basis Adjustment	9,042		9,638
Interest Rate Contract | Fair Value Hedges | Interest-bearing deposits | Designated as hedging instruments
Derivative [Line Items]
Carrying Amount of Assets/(Liabilities)	(1,975,613)		(2,013,504)
Hedge Accounting Basis Adjustment	17,583		(8,711)
Interest Rate Contract | Fair Value Hedges | Long-term debt | Designated as hedging instruments
Derivative [Line Items]
Carrying Amount of Assets/(Liabilities)	(749,119)		(546,872)
Hedge Accounting Basis Adjustment	$ 15,280		$ (5,986)