Loans and Leases and the Allowance for Credit Losses - Schedule of Amortized Cost Basis of Loans and Leases by Credit Quality Indicator, Loan Class, and Year of Origination (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	$ 2,750,366
2019	1,877,674
2018	1,243,476
2017	1,021,317
2016	1,026,082
Prior	1,738,977
Revolving Loans	2,093,169
Revolving Loans Converted to Term Loans	42,547
Total Loans and Leases	11,793,608
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	1,630,318
2019	859,546
2018	619,148
2017	377,449
2016	373,294
Prior	655,942
Revolving Loans	500,055
Revolving Loans Converted to Term Loans	1,115
Total Loans and Leases	5,016,867
Commercial | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	891,773
2019	173,211
2018	187,317
2017	74,812
2016	66,055
Prior	106,492
Revolving Loans	407,707
Revolving Loans Converted to Term Loans	1,115
Total Loans and Leases	1,908,482
Commercial | Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	858,458
2019	171,894
2018	184,256
2017	73,712
2016	62,461
Prior	86,296
Revolving Loans	364,123
Revolving Loans Converted to Term Loans	977
Total Loans and Leases	1,802,177
Commercial | Commercial and Industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	9,201
2019	510
2018	2,155
2017	162
2016	2,001
Prior	147
Revolving Loans	20,397
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	34,573
Commercial | Commercial and Industrial | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	24,114
2019	807
2018	906
2017	938
2016	1,593
Prior	20,049
Revolving Loans	23,187
Revolving Loans Converted to Term Loans	138
Total Loans and Leases	71,732
Commercial | Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	635,585
2019	547,416
2018	401,930
2017	286,356
2016	296,618
Prior	503,159
Revolving Loans	74,547
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	2,745,611
Commercial | Commercial Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	588,510
2019	521,907
2018	377,630
2017	270,617
2016	290,575
Prior	487,821
Revolving Loans	74,547
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	2,611,607
Commercial | Commercial Mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	5,621
2019	24,850
2018	19,416
2017	15,463
2016	1,252
Prior	5,432
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	72,034
Commercial | Commercial Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	41,454
2019	659
2018	4,884
2017	276
2016	4,791
Prior	9,906
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	61,970
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	89,712
2019	117,759
2018	14,221
2017	11,450
2016	0
Prior	0
Revolving Loans	17,801
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	250,943
Commercial | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	89,712
2019	117,759
2018	14,221
2017	11,450
2016	0
Prior	0
Revolving Loans	17,801
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	250,943
Commercial | Lease Financing
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	13,248
2019	21,160
2018	15,680
2017	4,831
2016	10,621
Prior	46,291
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	111,831
Commercial | Lease Financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	13,214
2019	21,089
2018	14,549
2017	4,783
2016	10,509
Prior	46,291
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	110,435
Commercial | Lease Financing | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	34
2019	71
2018	1,131
2017	48
2016	112
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	1,396
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	1,120,048
2019	1,018,128
2018	624,328
2017	643,868
2016	652,788
Prior	1,083,035
Revolving Loans	1,593,114
Revolving Loans Converted to Term Loans	41,432
Total Loans and Leases	6,776,741
Consumer | Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	894,542
2019	629,503
2018	345,194
2017	517,338
2016	601,481
Prior	1,056,170
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	4,044,228
Consumer | Residential Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	894,542
2019	629,503
2018	345,194
2017	516,410
2016	601,481
Prior	1,052,843
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	4,039,973
Consumer | Residential Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	0
2019	0
2018	0
2017	928
2016	0
Prior	3,327
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	4,255
Consumer | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	5,406
Revolving Loans	1,560,252
Revolving Loans Converted to Term Loans	39,828
Total Loans and Leases	1,605,486
Consumer | Home Equity Loan [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	5,337
Revolving Loans	1,557,040
Revolving Loans Converted to Term Loans	38,766
Total Loans and Leases	1,601,143
Consumer | Home Equity Loan [Member] | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	69
Revolving Loans	3,212
Revolving Loans Converted to Term Loans	1,062
Total Loans and Leases	4,343
Consumer | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	167,991
2019	230,997
2018	175,196
2017	78,552
2016	39,677
Prior	17,524
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	709,937
Consumer | Automobile | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	167,991
2019	230,969
2018	175,173
2017	78,461
2016	39,677
Prior	17,509
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	709,780
Consumer | Automobile | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	0
2019	28
2018	23
2017	91
2016	0
Prior	15
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	157
Consumer | Other Loans
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	57,515
2019	157,628
2018	103,938
2017	47,978
2016	11,630
Prior	3,935
Revolving Loans	32,862
Revolving Loans Converted to Term Loans	1,604
Total Loans and Leases	417,090
Consumer | Other Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	57,497
2019	157,529
2018	103,895
2017	47,942
2016	11,616
Prior	3,933
Revolving Loans	32,845
Revolving Loans Converted to Term Loans	1,575
Total Loans and Leases	416,832
Consumer | Other Loans | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD September 30, 2020	18
2019	99
2018	43
2017	36
2016	14
Prior	2
Revolving Loans	17
Revolving Loans Converted to Term Loans	29
Total Loans and Leases	$ 258