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		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value Hedges | Interest-bearing deposits
Derivative [Line Items]
Hedge Accounting Basis Adjustment	$ (1,072)	$ 17,523	$ 7,224	$ 20,341
Fair Value Hedges | Long-term debt
Derivative [Line Items]
Hedge Accounting Basis Adjustment	939	$ 17,769	6,365	$ 19,224
Interest Rate Contract | Interest-bearing deposits | Derivatives not designated as hedging instruments
Derivative [Line Items]
Hedge Accounting Basis Adjustment			1,669
Interest Rate Contract | Long-term debt | Derivatives not designated as hedging instruments
Derivative [Line Items]
Hedge Accounting Basis Adjustment			7,546
Interest Rate Contract | Fair Value Hedges | Interest-bearing deposits | Designated as hedging instruments
Derivative [Line Items]
Carrying Amount of Assets/(Liabilities)	(2,073,504)		(2,073,504)		$ (1,680,000)
Hedge Accounting Basis Adjustment			7,224		24,227
Interest Rate Contract | Fair Value Hedges | Long-term debt | Designated as hedging instruments
Derivative [Line Items]
Carrying Amount of Assets/(Liabilities)	$ (695,562)		(695,562)		(545,787)
Hedge Accounting Basis Adjustment			$ 6,366		$ 19,348