Loans and Leases - Loans by FICO Score, Consumer (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	$ 59,706,531	$ 31,061,111
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]
2020	1,458,649
2019	1,801,575
2018	1,233,928
2017	1,022,933
2016	1,139,118
Prior to 2016	3,121,829
Revolving loans	2,141,324
Revolving Loans converted to term loans	408,513
Total loans, net of unearned income	12,327,869	6,177,139
Consumer | Consumer real estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	809,079
2019	1,242,805
2018	797,553
2017	677,865
2016	746,150
Prior to 2016	1,910,304
Revolving loans	1,304,498
Revolving Loans converted to term loans	178,921
Total loans, net of unearned income	7,667,175
Consumer | Consumer real estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	96,670
2019	168,223
2018	110,859
2017	81,669
2016	93,933
Prior to 2016	205,824
Revolving loans	204,419
Revolving Loans converted to term loans	30,342
Total loans, net of unearned income	991,939
Consumer | Consumer real estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	84,995
2019	122,293
2018	89,193
2017	84,727
2016	73,587
Prior to 2016	225,227
Revolving loans	181,823
Revolving Loans converted to term loans	39,361
Total loans, net of unearned income	901,206
Consumer | Consumer real estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	88,346
2019	146,789
2018	143,213
2017	88,989
2016	91,062
Prior to 2016	316,577
Revolving loans	263,818
Revolving Loans converted to term loans	63,156
Total loans, net of unearned income	1,201,950
Consumer | Consumer real estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	21,847
2019	73,365
2018	40,104
2017	28,207
2016	36,391
Prior to 2016	140,682
Revolving loans	87,205
Revolving Loans converted to term loans	39,707
Total loans, net of unearned income	467,508
Consumer | Consumer real estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	357,712
2019	48,100
2018	53,006
2017	61,476
2016	97,995
Prior to 2016	323,215
Revolving loans	99,561
Revolving Loans converted to term loans	57,026
Total loans, net of unearned income	1,098,091
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	111,217
2019	105,688
2018	128,504
2017	90,662
2016	74,463
Prior to 2016	313,535
Revolving loans	372,706
Revolving Loans converted to term loans	15,283
Total loans, net of unearned income	1,212,058	495,864
Consumer | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	45,014
2019	60,629
2018	67,379
2017	44,445
2016	27,990
Prior to 2016	129,793
Revolving loans	143,754
Revolving Loans converted to term loans	5,263
Total loans, net of unearned income	524,267
Consumer | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	6,617
2019	8,673
2018	10,856
2017	9,913
2016	9,051
Prior to 2016	29,740
Revolving loans	90,623
Revolving Loans converted to term loans	1,630
Total loans, net of unearned income	167,103
Consumer | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	6,172
2019	9,215
2018	9,903
2017	8,635
2016	4,567
Prior to 2016	42,102
Revolving loans	41,039
Revolving Loans converted to term loans	1,731
Total loans, net of unearned income	123,364
Consumer | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	27,173
2019	14,206
2018	16,352
2017	11,032
2016	10,600
Prior to 2016	53,772
Revolving loans	54,963
Revolving Loans converted to term loans	3,737
Total loans, net of unearned income	191,835
Consumer | Credit Card and Other | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	3,526
2019	5,559
2018	7,990
2017	5,761
2016	12,823
Prior to 2016	29,168
Revolving loans	19,492
Revolving Loans converted to term loans	1,406
Total loans, net of unearned income	85,725
Consumer | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	22,715
2019	7,406
2018	16,024
2017	10,876
2016	9,432
Prior to 2016	28,960
Revolving loans	22,835
Revolving Loans converted to term loans	1,516
Total loans, net of unearned income	119,764
Unsecured Debt | Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving Loans converted to term loans	5,300
HELOC | Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving Loans converted to term loans	22,700
Total loans, net of unearned income	$ 2,549,837	$ 1,286,875