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Mergers and Acquisitions - CSFL Narrative (Details) $ in Thousands		3 Months Ended				4 Months Ended	6 Months Ended
	Jun. 07, 2020 USD ($) shares	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Mergers and Acquisitions
Goodwill		$ 1,581,085	$ 1,563,942				$ 1,581,085
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			$ 15,500	10,300
Purchased price decreased			5,200
Stock option conversion	2,900
Loans at fair value acquired	12,950,583
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	562,400	562,400				562,400
Acquisition costs		33,000			$ 40,200		43,000	$ 44,300
CSFL | Core Deposits
Mergers and Acquisitions
Estimated fair value of intangible asset	$ 125,900
Estimated economic life of intangible asset	10 years
Subsequent Fair Value Adjustments | CSFL
Mergers and Acquisitions
Loans at fair value acquired	$ 29,834
Estimated fair value of intangible asset	10,000			$ 10,000		$ 10,000
Goodwill	$ (38,113)	$ 38,100	$ 38,100				$ 38,100

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Represents the value of stock options of the acquired entity converted as a part of consideration for acquisition.

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The amount of credit deficiencies that were identified as Purchased Credit Deteriorated ("PCD") loans recognized as of the acquisition date.

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