Loans and Leases - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 59,706,531		$ 31,061,111
Allowance for loan and lease losses	(988,102)	$ (537,881)	(200,307)	$ (193,149)	$ (192,749)	$ (180,424)
Net loans and leases	58,718,429		30,860,804
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property, plant, and equipment and finance lease right-of-use asset	524,200
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	33,655,717		20,051,091
Allowance for loan and lease losses			(158,598)
Commercial | Commercial and industrial (a)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	28,048,649		15,640,208
Allowance for loan and lease losses	(489,094)	(318,722)	(122,486)	(114,130)	(116,096)	(98,947)
Commercial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,607,068		4,410,883
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	12,510,887		4,337,017
Allowance for loan and lease losses	(207,958)	(57,285)	(36,112)	(35,625)	(32,953)	(31,311)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	12,327,869		6,177,139
Consumer | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,549,837		1,287,441
Consumer | R/E installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	9,778,032		4,889,698
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,212,058		495,864
Allowance for loan and lease losses	$ (25,620)	$ (18,117)	$ (13,266)	$ (12,720)	$ (12,168)	$ (12,727)