Allowance for Credit Losses and Credit Quality - Schedule of Amortized Cost Basis of Loans and Leases by Year of Origination (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 7,980,611
2019	6,575,571
2018	4,384,806
2017	3,079,577
2016	1,950,078
2015	3,936,426
Revolving Loans and Leases	6,319,940
Revolving Loans and Leases Converted to Term Loans and Leases	239,399
Total	34,466,408	$ 34,497,464
Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	38,046
2019	104,735
2018	118,588
2017	103,310
2016	51,547
2015	157,825
Revolving Loans and Leases	100,359
Revolving Loans and Leases Converted to Term Loans and Leases	2,892
Total	677,302
Commercial Loan and Lease Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5,734,281
2019	5,092,505
2018	3,521,993
2017	2,413,072
2016	1,356,381
2015	2,067,914
Revolving Loans and Leases	3,525,576
Revolving Loans and Leases Converted to Term Loans and Leases	230,479
Total	23,942,201
Commercial Loan and Lease Portfolio | Equipment Leased to Other Party
Financing Receivable, Credit Quality Indicator [Line Items]
Leased equipment	230,500
Commercial Loan and Lease Portfolio | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,160
2019	1,025
2018	774
2017	476
2016	392
2015	213
Revolving Loans and Leases	375
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	5,415
Commercial Loan and Lease Portfolio | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	34,493
2019	93,842
2018	101,486
2017	98,478
2016	47,937
2015	86,146
Revolving Loans and Leases	40,364
Revolving Loans and Leases Converted to Term Loans and Leases	1,954
Total	504,700
Commercial Loan and Lease Portfolio | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,324,560
2019	2,013,463
2018	1,134,482
2017	631,145
2016	415,172
2015	352,585
Revolving Loans and Leases	3,501,763
Revolving Loans and Leases Converted to Term Loans and Leases	49,213
Total	11,422,383
Commercial Loan and Lease Portfolio | Commercial and industrial | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	874
2019	50
2018	94
2017	13
2016	0
2015	52
Revolving Loans and Leases	375
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	1,458
Commercial Loan and Lease Portfolio | Commercial and industrial | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	26,109
2019	61,595
2018	60,686
2017	29,360
2016	17,669
2015	23,644
Revolving Loans and Leases	40,364
Revolving Loans and Leases Converted to Term Loans and Leases	12
Total	259,439
Commercial Loan and Lease Portfolio | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,385,857
2019	2,324,804
2018	1,962,391
2017	1,534,089
2016	820,373
2015	1,675,073
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	9,702,587
Commercial Loan and Lease Portfolio | Commercial real estate | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	22
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	22
Commercial Loan and Lease Portfolio | Commercial real estate | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5,194
2019	4,835
2018	14,452
2017	53,934
2016	21,667
2015	54,357
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	154,439
Commercial Loan and Lease Portfolio | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,023,864
2019	754,238
2018	425,120
2017	247,838
2016	120,836
2015	40,256
Revolving Loans and Leases	23,813
Revolving Loans and Leases Converted to Term Loans and Leases	181,266
Total	2,817,231
Commercial Loan and Lease Portfolio | Lease financing | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,286
2019	975
2018	680
2017	463
2016	392
2015	139
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	3,935
Commercial Loan and Lease Portfolio | Lease financing | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,190
2019	27,412
2018	26,348
2017	15,184
2016	8,601
2015	8,145
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	1,942
Total	90,822
Consumer Loan Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,246,330
2019	1,483,066
2018	862,813
2017	666,505
2016	593,697
2015	1,868,512
Revolving Loans and Leases	2,794,364
Revolving Loans and Leases Converted to Term Loans and Leases	8,920
Total	10,524,207
Consumer Loan Portfolio | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	85
2019	134
2018	0
2017	0
2016	0
2015	1,773
Revolving Loans and Leases	36
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	2,028
Consumer Loan Portfolio | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,553
2019	10,893
2018	17,102
2017	4,832
2016	3,610
2015	71,679
Revolving Loans and Leases	59,995
Revolving Loans and Leases Converted to Term Loans and Leases	938
Total	172,602
Consumer Loan Portfolio | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,015,083
2019	1,057,046
2018	621,395
2017	440,218
2016	443,630
2015	1,604,673
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	6,182,045
Consumer Loan Portfolio | Residential mortgage | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	85
2019	134
2018	0
2017	0
2016	0
2015	1,746
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	1,965
Consumer Loan Portfolio | Residential mortgage | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,631
2019	9,177
2018	16,391
2017	4,172
2016	2,812
2015	62,470
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	97,653
Consumer Loan Portfolio | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	24,006
2019	52,917
2018	48,671
2017	40,349
2016	29,495
2015	134,501
Revolving Loans and Leases	2,769,944
Revolving Loans and Leases Converted to Term Loans and Leases	8,853
Total	3,108,736
Consumer Loan Portfolio | Home equity | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	27
Revolving Loans and Leases	36
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	63
Consumer Loan Portfolio | Home equity | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	889
2019	1,449
2018	530
2017	379
2016	223
2015	5,149
Revolving Loans and Leases	59,826
Revolving Loans and Leases Converted to Term Loans and Leases	938
Total	69,383
Consumer Loan Portfolio | Consumer installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	207,241
2019	373,103
2018	192,747
2017	185,938
2016	120,572
2015	129,338
Revolving Loans and Leases	24,420
Revolving Loans and Leases Converted to Term Loans and Leases	67
Total	1,233,426
Consumer Loan Portfolio | Consumer installment | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	0
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	0
Consumer Loan Portfolio | Consumer installment | Impaired Loans With No Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	33
2019	267
2018	181
2017	281
2016	575
2015	4,060
Revolving Loans and Leases	169
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	5,566
Pass | Commercial Loan and Lease Portfolio | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,282,275
2019	1,877,468
2018	994,081
2017	547,940
2016	357,567
2015	316,557
Revolving Loans and Leases	3,286,687
Revolving Loans and Leases Converted to Term Loans and Leases	48,079
Total	10,710,654
Pass | Commercial Loan and Lease Portfolio | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,361,117
2019	2,193,489
2018	1,877,374
2017	1,211,426
2016	683,612
2015	1,480,027
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	8,807,045
Pass | Commercial Loan and Lease Portfolio | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,013,374
2019	715,327
2018	393,644
2017	226,818
2016	109,992
2015	30,620
Revolving Loans and Leases	23,806
Revolving Loans and Leases Converted to Term Loans and Leases	167,726
Total	2,681,307
Pass | Consumer Loan Portfolio | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,011,791
2019	1,047,735
2018	604,127
2017	435,617
2016	439,816
2015	1,539,779
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	6,078,865
Pass | Consumer Loan Portfolio | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,066
2019	51,448
2018	48,092
2017	39,834
2016	29,071
2015	126,147
Revolving Loans and Leases	2,703,354
Revolving Loans and Leases Converted to Term Loans and Leases	7,753
Total	3,028,765
Pass | Consumer Loan Portfolio | Consumer installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	206,994
2019	371,924
2018	192,067
2017	185,051
2016	119,663
2015	127,252
Revolving Loans and Leases	24,043
Revolving Loans and Leases Converted to Term Loans and Leases	67
Total	1,227,061
Special mention | Commercial Loan and Lease Portfolio | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13,377
2019	66,485
2018	46,174
2017	34,959
2016	4,661
2015	6,733
Revolving Loans and Leases	94,338
Revolving Loans and Leases Converted to Term Loans and Leases	858
Total	267,585
Special mention | Commercial Loan and Lease Portfolio | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	17,745
2019	78,236
2018	53,087
2017	197,935
2016	79,540
2015	104,473
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	531,016
Special mention | Commercial Loan and Lease Portfolio | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,050
2019	9,871
2018	3,897
2017	4,870
2016	1,484
2015	1,001
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	8,911
Total	34,084
Special mention | Consumer Loan Portfolio | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015	112
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	112
Substandard | Commercial Loan and Lease Portfolio | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	28,908
2019	69,510
2018	94,227
2017	48,246
2016	52,944
2015	29,295
Revolving Loans and Leases	120,738
Revolving Loans and Leases Converted to Term Loans and Leases	276
Total	444,144
Substandard | Commercial Loan and Lease Portfolio | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,995
2019	53,079
2018	31,930
2017	124,728
2016	57,221
2015	90,573
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	364,526
Substandard | Commercial Loan and Lease Portfolio | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,440
2019	29,040
2018	27,579
2017	16,150
2016	9,360
2015	8,635
Revolving Loans and Leases	7
Revolving Loans and Leases Converted to Term Loans and Leases	4,629
Total	101,840
Substandard | Consumer Loan Portfolio | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,292
2019	9,311
2018	17,268
2017	4,601
2016	3,814
2015	64,782
Revolving Loans and Leases	0
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	103,068
Substandard | Consumer Loan Portfolio | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	940
2019	1,469
2018	579
2017	515
2016	424
2015	8,354
Revolving Loans and Leases	66,590
Revolving Loans and Leases Converted to Term Loans and Leases	1,100
Total	79,971
Substandard | Consumer Loan Portfolio | Consumer installment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	247
2019	1,179
2018	680
2017	887
2016	909
2015	2,086
Revolving Loans and Leases	377
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	6,365
Financial Asset, Equal to or Greater than 90 Days Past Due | Impaired Loans With Valuation Allowance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,245
2019	1,159
2018	774
2017	476
2016	392
2015	1,986
Revolving Loans and Leases	411
Revolving Loans and Leases Converted to Term Loans and Leases	0
Total	$ 7,443