Derivative Instruments and Hedging Activities (Effect of Fair Value Hedges on Consolidated Statements of Income) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ 1,154	$ 576
Interest rate contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(604)	(130)
Interest rate contracts | Swap | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	2,500
Other contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(337)	0
Mortgage derivatives | Interest rate lock commitments | Mortgage banking income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	7,024	693
Mortgage derivatives | Frward commitments to sell fixed-rate mortgage loans | Mortgage banking income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ (4,929)	$ 13