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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 07, 2020	Dec. 31, 2019	Jun. 30, 2019
Goodwill [Line Items]
Goodwill	$ 1,603,383		$ 1,002,900	$ 1,002,900
Core deposit and other intangibles	170,911		49,816	56,351
CSFL
Goodwill [Line Items]
Goodwill		$ 600,483	$ 1,000	$ 1,000
Goodwill related to the CSFL merger	1,600
Core deposit and other intangibles	125,900
Core Deposits
Goodwill [Line Items]
Intangible assets related to the CSFL merger	$ 600,500