Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets [Roll Forward]
Total goodwill, end of period	$ 823,172	$ 765,842	$ 765,842
Established through acquisitions	57,330	0	0
Core deposit intangible, net, beginning of period	26,734
CDI current period amortization	(7,987)	(8,724)	(10,479)
Indefinite-lived Intangible Assets (Excluding Goodwill)	919	919	919
Total core deposit intangible, end of period	34,647	26,734
Intangible Assets, Net (Excluding Goodwill)	34,647	26,734	35,458
Total goodwill and intangible assets, end of period	857,819	792,576	801,300
Core Deposits
Goodwill and Intangible Assets [Roll Forward]
Gross core deposit intangible balance, beginning of period	78,821	105,473	105,473
Accumulated amortization, beginning of period	(53,006)	(70,934)	(60,455)
Core deposit intangible, net, beginning of period	25,815	34,539	45,018
Established through acquisitions	15,900	0	0
CDI current period amortization	(7,987)	(8,724)	(10,479)
Total core deposit intangible, end of period	$ 33,728	$ 25,815	$ 34,539
Estimated life of CDI, in years	10 years