Loans and Leases - Accruing And Non-Accruing Loans By Class (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]
Current, Accruing	$ 59,171,038		$ 30,841,035
Total Accruing	59,259,695		30,898,946
Current, Non-Accruing	272,103		100,382
Total Non-Accruing	446,836		162,165
Total 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
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	74,042		36,052
Past Due, Non-Accruing	36,600		20,217
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	14,615		21,859
Past Due, Non-Accruing	138,133		41,566
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total 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]
Current, Accruing	33,422,866		19,967,302
Total Accruing	33,442,907		19,976,779
Current, Non-Accruing	126,674		36,564
Total Non-Accruing	212,810		74,312
Total 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 | Commercial and industrial (a) | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	19,892		7,442
Past Due, Non-Accruing	25,327		14,385
Commercial | Commercial and industrial (a) | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	149		2,035
Past Due, Non-Accruing	60,809		23,363
Commercial | Commercial and industrial (a) | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	27,815,798		15,532,579
Total Accruing	27,835,839		15,539,971
Current, Non-Accruing	126,674		36,564
Total Non-Accruing	212,810		74,312
Total loans, net of unearned income	28,048,649		15,614,283
Nonaccrual, no allowance	125,700
Commercial | Commercial and industrial (a) | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	19,892		7,155
Past Due, Non-Accruing	25,327		14,385
Commercial | Commercial and industrial (a) | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	149		237
Past Due, Non-Accruing	60,809		23,363
Commercial | Commercial and industrial (a) | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	5,607,068		4,410,883
Total Accruing	5,607,068		4,410,883
Current, Non-Accruing	0		0
Total Non-Accruing	0		0
Total loans, net of unearned income	5,607,068		4,410,883
Commercial | Commercial and industrial (a) | Loans to mortgage companies | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	0		0
Past Due, Non-Accruing	0		0
Commercial | Commercial and industrial (a) | Loans to mortgage companies | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	0		0
Past Due, Non-Accruing	0		0
Commercial | Commercial and industrial (a) | TRUPS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	209,400		218,300
Allowance for loan and lease losses	18,200		19,100
Commercial | Commercial and industrial (a) | C&I Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing			23,840
Total Accruing			25,925
Current, Non-Accruing			0
Total Non-Accruing			0
Total loans, net of unearned income			25,925
Commercial | Commercial and industrial (a) | C&I Purchase Credit Impaired Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			287
Past Due, Non-Accruing			0
Commercial | Commercial and industrial (a) | C&I Purchase Credit Impaired Loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			1,798
Past Due, Non-Accruing			0
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing			4,334,283
Total Accruing			4,335,192
Current, Non-Accruing			0
Total Non-Accruing			1,825
Total 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
Commercial | Commercial real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			814
Past Due, Non-Accruing			485
Commercial | Commercial real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			95
Past Due, Non-Accruing			1,340
Commercial | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing			4,329,531
Total Accruing			4,330,217
Current, Non-Accruing			0
Total Non-Accruing			1,825
Total loans, net of unearned income	12,510,887		4,332,042
Commercial | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			686
Past Due, Non-Accruing			485
Commercial | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			0
Past Due, Non-Accruing			1,340
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing			4,752
Total Accruing			4,975
Current, Non-Accruing			0
Total Non-Accruing			0
Total loans, net of unearned income			4,975
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			128
Past Due, Non-Accruing			0
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			95
Past Due, Non-Accruing			0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	12,327,869		6,177,139
Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	12,099,420		6,048,510
Total Accruing	12,147,781		6,091,445
Current, Non-Accruing	101,707		63,717
Total Non-Accruing	180,088		85,694
Total loans, net of unearned income	12,327,869		6,177,139
Allowance for loan and lease losses	265,430	143,757	28,443	30,674	31,532	37,439
Consumer | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	34,806		24,820
Past Due, Non-Accruing	8,022		5,303
Consumer | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	13,555		18,115
Past Due, Non-Accruing	70,359		16,674
Consumer | Consumer Real Estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	2,467,907		1,217,344
Total Accruing	2,486,683		1,232,169
Current, Non-Accruing	47,101		43,007
Total Non-Accruing	63,154		54,706
Total loans, net of unearned income	2,549,837		1,286,875
Consumer | Consumer Real Estate | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	11,884		9,156
Past Due, Non-Accruing	4,628		4,227
Consumer | Consumer Real Estate | HELOC | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	6,892		5,669
Past Due, Non-Accruing	11,425		7,472
Consumer | Consumer Real Estate | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	9,631,513		4,812,446
Total Accruing	9,661,098		4,834,510
Current, Non-Accruing	54,606		20,710
Total Non-Accruing	116,934		30,988
Total loans, net of unearned income	9,778,032		4,865,498
Consumer | Consumer Real Estate | R/E Installment Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	22,922		12,894
Past Due, Non-Accruing	3,394		1,076
Consumer | Consumer Real Estate | R/E Installment Loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	6,663		9,170
Past Due, Non-Accruing	58,934		9,202
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing			18,720
Total Accruing			24,766
Current, Non-Accruing			0
Total Non-Accruing			0
Total loans, net of unearned income			24,766
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			2,770
Past Due, Non-Accruing			0
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			3,276
Past Due, Non-Accruing			0
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	1,204,059		490,940
Total Accruing	1,209,181		495,530
Current, Non-Accruing	1,205		101
Total Non-Accruing	2,877		334
Total 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
Consumer | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	4,211		2,976
Past Due, Non-Accruing	720		44
Consumer | Credit Card and Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	911		1,614
Past Due, Non-Accruing	952		189
Consumer | Credit Card and Other | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	267,880		198,917
Total Accruing	270,182		201,171
Current, Non-Accruing	242		0
Total Non-Accruing	329		0
Total loans, net of unearned income	270,511		201,171
Consumer | Credit Card and Other | Credit Card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	1,513		1,076
Past Due, Non-Accruing	38		0
Consumer | Credit Card and Other | Credit Card | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	789		1,178
Past Due, Non-Accruing	49		0
Consumer | Credit Card and Other | Other Consumer Loans Class
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	936,179		291,700
Total Accruing	938,999		293,839
Current, Non-Accruing	963		101
Total Non-Accruing	2,548		334
Total loans, net of unearned income	941,547		294,173
Consumer | Credit Card and Other | Other Consumer Loans Class | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	2,698		1,802
Past Due, Non-Accruing	682		44
Consumer | Credit Card and Other | Other Consumer Loans Class | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	122		337
Past Due, Non-Accruing	903		189
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing			323
Total Accruing			520
Current, Non-Accruing			0
Total Non-Accruing			0
Total loans, net of unearned income			520
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			98
Past Due, Non-Accruing			0
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing			99
Past Due, Non-Accruing			$ 0
Commercial real estate | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	12,444,693
Total Accruing	12,459,826
Current, Non-Accruing	42,517
Total Non-Accruing	51,061
Total loans, net of unearned income	12,510,887
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	15,133
Past Due, Non-Accruing	2,531
Commercial real estate | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	0
Past Due, Non-Accruing	$ 6,013