Derivative Financial Instruments (Schedule of Fair Value of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative Assets	$ 278,423	$ 103,644
Derivative Liabilities	288,465	129,204
Interest rate derivatives
Derivative [Line Items]
Derivative Assets	229,387	100,569
Derivative Liabilities	275,843	126,805
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	8,182	310
Derivative Liabilities	54,235	25,908
Not designed as hedging instrument
Derivative [Line Items]
Derivative Assets	270,241	103,334
Derivative Liabilities	234,230	103,296
Not designed as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	221,205	100,259
Derivative Liabilities	221,608	100,897
Not designed as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	48,925	2,860
Derivative Liabilities	0	259
Not designed as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	0	142
Derivative Liabilities	12,510	2,070
Not designed as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	111	73
Derivative Liabilities	112	70
Cash flow hedging | Designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	8,182	0
Derivative Liabilities	39,715	19,385
Fair value hedging | Designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	0	310
Derivative Liabilities	$ 14,520	$ 6,523