Derivative Instruments and Hedging Activities (Effect of Fair Value Hedges on Consolidated Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
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Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income		$ 2,500
Derivatives not designated as hedging instruments
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ 2,359		$ (1,431)	$ 7,237	$ (621)
Derivatives not designated as hedging instruments | Interest rate contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	176		549	225	640
Derivatives not designated as hedging instruments | Other contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	47		(144)	(286)	(144)
Derivatives not designated as hedging instruments | Mortgage derivatives | Mortgage derivatives - interest rate lock commitments | Mortgage banking income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	2,532		22	8,922	970
Derivatives not designated as hedging instruments | Mortgage derivatives | Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans | Mortgage banking income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(396)		642	(1,624)	413
Derivatives not designated as hedging instruments | Visa derivative | Other non-interest expense
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ 0		$ (2,500)	$ 0	$ (2,500)