Derivative Instruments and Hedging Activities (Effect of Fair Value Hedges on Consolidated Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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	$ 3,724	$ 233	4,878	$ 810
Derivatives not designated as hedging instruments | Interest rate contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	653	221	49	91
Derivatives not designated as hedging instruments | Other contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	4	0	(333)	0
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	(634)	255	6,390	948
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	$ 3,701	$ (243)	$ (1,228)	$ (229)