Derivative Financial Instruments (Schedule of Fair Value of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Assets	$ 103,644	$ 73,172
Derivative Liabilities	129,204	68,088
Interest rate derivatives
Derivative [Line Items]
Derivative Assets	100,569	68,425
Derivative Liabilities	126,805	62,571
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	310	8,906
Derivative Liabilities	25,908	3,412
Not designed as hedging instrument
Derivative [Line Items]
Derivative Assets	103,334	64,266
Derivative Liabilities	103,296	64,676
Not designed as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	100,259	59,519
Derivative Liabilities	100,897	59,159
Not designed as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	2,860	3,405
Derivative Liabilities	259	2,694
Not designed as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	142	0
Derivative Liabilities	2,070	1,486
Not designed as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	73	1,342
Derivative Liabilities	70	1,337
Cash flow hedging | Designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	0	6,270
Derivative Liabilities	19,385	1,656
Fair value hedging | Designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	310	2,636
Derivative Liabilities	$ 6,523	$ 1,756