Goodwill and Other Intangible Assets (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2019	Apr. 12, 2019
Goodwill [Line Items]
Goodwill		$ 1,146,007,000	$ 1,075,305,000
Goodwill impairment	$ 0	0	0
Amortization of intangibles		$ 13,494,000	13,495,000	$ 11,805,000
Minimum
Goodwill [Line Items]
Finite-lived intangible asset, useful life		10 years
Maximum
Goodwill [Line Items]
Finite-lived intangible asset, useful life		15 years
Core deposit intangible
Goodwill [Line Items]
Amortization of intangibles		$ 12,122,000	12,121,000	10,700,000
Core deposit intangible | Minimum
Goodwill [Line Items]
Finite-lived intangible asset, useful life		10 years
Core deposit intangible | Maximum
Goodwill [Line Items]
Finite-lived intangible asset, useful life		15 years
Books of Business Intangible
Goodwill [Line Items]
Amortization of intangibles		$ 1,374,000	1,372,000	1,100,000
Landrum Company
Goodwill [Line Items]
Goodwill				131,300,000	$ 151,125,000
Goodwill increase			$ 19,800,000
Reliance Bancshares, Inc.
Goodwill [Line Items]
Goodwill				$ 78,500,000		$ 78,493,000
Triumph
Goodwill [Line Items]
Goodwill		39,000,000
Landmark Bank
Goodwill [Line Items]
Goodwill		$ 31,700,000