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Mergers and Acquisitions - Narrative (Details) $ in Thousands				3 Months Ended	4 Months Ended	12 Months Ended
	Jul. 23, 2021	Feb. 01, 2021 USD ($)	Jun. 07, 2020 USD ($) shares	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Mergers and Acquisitions
Goodwill				$ 1,563,942		$ 1,581,085	$ 1,563,942	$ 1,002,900
Assets				37,789,873		41,960,032	37,789,873
CSFL
Mergers and Acquisitions
Shares of the common stock in exchange for each share			0.3001
Number of shares issued as consideration | shares			37,271,069
Purchase price			$ 2,256,708
Value of the conversion of outstanding stock options and restricted stock			10,300	10,300	$ 15,500
Purchased price decreased				5,200
Loans at fair value acquired after initial fair value adjustment			13,000,000
Estimated discount on loans			$ 239,500
Estimated discount on loans (as a percent)			1.82%
Fair value adjustment on loans acquired			$ 29,800
Loans acquired as a percentage of total loans			113.90%
Credit deficiencies that were identified as Purchased Credit Deteriorated ("PCD") loans.			$ 3,100,000
Estimated fair value of intangible asset			140,862
Goodwill			562,370
Acquisition costs						64,400	83,000
CSFL | Core deposit intangibles
Mergers and Acquisitions
Estimated fair value of intangible asset			$ 125,900
Estimated economic life of intangible asset			10 years
Duncan-Williams, Inc.
Mergers and Acquisitions
Purchase price		$ 48,300
Goodwill		$ 15,800
Atlantic Capital
Mergers and Acquisitions
Shares of the common stock in exchange for each share	0.36
Assets						3,800
Loans						2,400
Deposits						3,300
Subsequent Fair Value Adjustments | CSFL
Mergers and Acquisitions
Estimated fair value of intangible asset			$ 10,000		$ 10,000
Goodwill			$ (38,113)	$ 562,400		$ 38,100	$ 562,400

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