Allowance for Credit Losses and Credit Quality - Schedule of Amortized Cost Basis of Loans and Leases by Year of Origination (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 2,360,096
2019	8,208,723
2018	5,797,920
2017	4,136,665
2016	2,698,466
Prior	5,054,767
Revolving Loans and Leases	7,360,772
Revolving Loans and Leases Converted to Term Loans and Leases	304,205
Total	35,921,614	$ 34,497,464
Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,091
2019	10,495
2018	21,460
2017	27,495
2016	27,496
Prior	118,854
Revolving Loans and Leases	40,864
Revolving Loans and Leases Converted to Term Loans and Leases	2,720
Total	250,475
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	614,657
2019	2,083,080
2018	1,377,030
2017	994,051
2016	851,187
Prior	2,402,037
Revolving Loans and Leases	3,029,261
Revolving Loans and Leases Converted to Term Loans and Leases	47,466
Total	11,398,769
Consumer | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	795
2019	3,433
2018	3,308
2017	3,160
2016	2,142
Prior	57,671
Revolving Loans and Leases	33,773
Revolving Loans and Leases Converted to Term Loans and Leases	1,834
Total	106,116
Consumer | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5
2019	0
2018	0
2017	0
2016	0
Prior	553
Revolving Loans and Leases	415
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	973
Consumer | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	505,138
2019	1,528,521
2018	1,048,568
2017	671,249
2016	620,422
Prior	2,043,917
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	17,499
Total	6,435,314
Consumer | Residential mortgage | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	267
2019	1,517
2018	2,383
2017	2,673
2016	1,857
Prior	52,338
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	945
Total	61,980
Consumer | Residential mortgage | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	553
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	553
Consumer | Consumer installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	97,037
2019	483,175
2018	258,760
2017	266,232
2016	189,220
Prior	179,585
Revolving Loans and Leases	35,944
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	1,509,953
Consumer | Consumer installment | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	33
2018	241
2017	122
2016	70
Prior	438
Revolving Loans and Leases	85
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	989
Consumer | Consumer installment | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	5
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	12,482
2019	71,384
2018	69,702
2017	56,570
2016	41,545
Prior	178,535
Revolving Loans and Leases	2,993,317
Revolving Loans and Leases Converted to Term Loans and Leases	29,967
Total	3,453,502
Consumer | Home equity | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	528
2019	1,883
2018	684
2017	365
2016	215
Prior	4,895
Revolving Loans and Leases	33,688
Revolving Loans and Leases Converted to Term Loans and Leases	889
Total	43,147
Consumer | Home equity | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans and Leases	415
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	415
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,745,439
2019	6,125,643
2018	4,420,890
2017	3,142,614
2016	1,847,279
Prior	2,652,730
Revolving Loans and Leases	4,331,511
Revolving Loans and Leases Converted to Term Loans and Leases	256,739
Total	24,522,845
Commercial | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	296
2019	7,062
2018	18,152
2017	24,335
2016	25,354
Prior	61,183
Revolving Loans and Leases	7,091
Revolving Loans and Leases Converted to Term Loans and Leases	886
Total	144,359
Commercial | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	2,012
2018	806
2017	219
2016	99
Prior	1,461
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	4,597
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	793,651
2019	2,814,079
2018	1,700,136
2017	996,744
2016	686,308
Prior	1,008,925
Revolving Loans and Leases	4,285,752
Revolving Loans and Leases Converted to Term Loans and Leases	41,348
Total	12,326,943
Commercial | Commercial and industrial | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	296
2019	5,192
2018	12,329
2017	15,382
2016	13,883
Prior	29,984
Revolving Loans and Leases	7,091
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	84,157
Commercial | Commercial and industrial | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	67
2016	39
Prior	4
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	110
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	685,194
2019	2,367,644
2018	2,163,830
2017	1,778,220
2016	942,600
Prior	1,548,339
Revolving Loans and Leases	1,077
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	9,486,904
Commercial | Commercial real estate | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	457
2018	3,758
2017	4,457
2016	9,707
Prior	28,653
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	47,032
Commercial | Commercial real estate | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	115
2017	0
2016	0
Prior	1,327
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	1,442
Commercial | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	266,594
2019	943,920
2018	556,924
2017	367,650
2016	218,371
Prior	95,466
Revolving Loans and Leases	44,682
Revolving Loans and Leases Converted to Term Loans and Leases	215,391
Total	2,708,998
Commercial | Lease financing | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1,413
2018	2,065
2017	4,496
2016	1,764
Prior	2,546
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	886
Total	13,170
Commercial | Lease financing | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	2,012
2018	691
2017	152
2016	60
Prior	130
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	3,045
Pass | Consumer | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	504,871
2019	1,526,611
2018	1,045,969
2017	668,442
2016	618,565
Prior	1,987,061
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	16,554
Total	6,368,073
Pass | Consumer | Consumer installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	97,037
2019	483,133
2018	258,519
2017	266,110
2016	189,150
Prior	179,147
Revolving Loans and Leases	35,851
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	1,508,947
Pass | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	11,857
2019	68,988
2018	68,945
2017	56,168
2016	41,278
Prior	172,810
Revolving Loans and Leases	2,956,158
Revolving Loans and Leases Converted to Term Loans and Leases	29,015
Total	3,405,219
Pass | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	791,458
2019	2,781,870
2018	1,607,788
2017	940,905
2016	630,425
Prior	917,788
Revolving Loans and Leases	4,058,569
Revolving Loans and Leases Converted to Term Loans and Leases	40,089
Total	11,768,892
Pass | Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	685,194
2019	2,328,888
2018	2,141,432
2017	1,671,351
2016	889,876
Prior	1,436,544
Revolving Loans and Leases	1,077
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	9,154,362
Pass | Commercial | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	262,563
2019	935,170
2018	549,772
2017	357,029
2016	212,876
Prior	89,606
Revolving Loans and Leases	44,682
Revolving Loans and Leases Converted to Term Loans and Leases	200,917
Total	2,652,615
Special Mention | Consumer | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	393
2018	0
2017	0
2016	0
Prior	382
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	775
Special Mention | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	230
2018	0
2017	37
2016	0
Prior	372
Revolving Loans and Leases	30
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	669
Special Mention | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	667
2019	15,050
2018	47,411
2017	37,612
2016	26,010
Prior	45,499
Revolving Loans and Leases	139,147
Revolving Loans and Leases Converted to Term Loans and Leases	1,259
Total	312,655
Special Mention | Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	38,094
2018	16,882
2017	97,826
2016	36,102
Prior	50,891
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	239,795
Special Mention | Commercial | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	660
2019	5,154
2018	3,781
2017	4,256
2016	2,899
Prior	2,327
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	11,524
Total	30,601
Substandard | Consumer | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	267
2019	1,517
2018	2,599
2017	2,807
2016	1,857
Prior	56,474
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	945
Total	66,466
Substandard | Consumer | Consumer installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	42
2018	241
2017	122
2016	70
Prior	438
Revolving Loans and Leases	93
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	1,006
Substandard | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	625
2019	2,166
2018	757
2017	365
2016	267
Prior	5,353
Revolving Loans and Leases	37,129
Revolving Loans and Leases Converted to Term Loans and Leases	952
Total	47,614
Substandard | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,526
2019	17,159
2018	43,437
2017	14,028
2016	29,873
Prior	45,130
Revolving Loans and Leases	88,036
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	239,189
Substandard | Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	662
2018	5,516
2017	9,043
2016	16,622
Prior	60,904
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	92,747
Substandard | Commercial | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,371
2019	3,596
2018	3,371
2017	6,365
2016	2,596
Prior	3,533
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	2,950
Total	25,782
Doubtful | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	1,500
2017	4,199
2016	0
Prior	508
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	6,207
Financial Asset, Equal to or Greater than 90 Days Past Due | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5
2019	2,012
2018	806
2017	219
2016	99
Prior	2,014
Revolving Loans and Leases	415
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	$ 5,570