Loans and Leases and the Allowance for Loan and Lease Losses (Credit Quality Indicators by Year of Origination) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	$ 2,013,950
2019	1,990,890
2018	1,373,829
2017	1,111,169
2016	1,132,671
Prior	1,930,563
Revolving Loans	2,206,300
Revolving Loans Converted to Term Loans	45,998
Total Loans and Leases	11,805,370
Revolving loans, converted to term loan during the period	1,300
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	1,329,023
2019	905,766
2018	664,215
2017	391,924
2016	421,812
Prior	730,306
Revolving Loans	578,447
Revolving Loans Converted to Term Loans	1,266
Total Loans and Leases	5,022,759
Commercial | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	780,037
2019	222,956
2018	203,266
2017	79,823
2016	85,200
Prior	121,886
Revolving Loans	462,505
Revolving Loans Converted to Term Loans	1,266
Total Loans and Leases	1,956,939
Commercial | Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	755,648
2019	221,992
2018	199,600
2017	78,712
2016	83,437
Prior	101,529
Revolving Loans	431,950
Revolving Loans Converted to Term Loans	1,163
Total Loans and Leases	1,874,031
Commercial | Commercial and Industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	1,358
2019	126
2018	2,046
2017	0
2016	114
Prior	194
Revolving Loans	7,131
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	10,969
Commercial | Commercial and Industrial | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	23,031
2019	838
2018	1,620
2017	1,111
2016	1,649
Prior	20,163
Revolving Loans	23,424
Revolving Loans Converted to Term Loans	103
Total Loans and Leases	71,939
Commercial | Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	471,453
2019	572,718
2018	410,283
2017	295,301
2016	325,180
Prior	558,677
Revolving Loans	73,922
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	2,707,534
Commercial | Commercial Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	433,742
2019	568,350
2018	385,977
2017	280,736
2016	319,128
Prior	543,951
Revolving Loans	73,922
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	2,605,806
Commercial | Commercial Mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	4,543
2019	0
2018	21,517
2017	13,160
2016	1,261
Prior	5,453
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	45,934
Commercial | Commercial Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	33,168
2019	4,368
2018	2,789
2017	1,405
2016	4,791
Prior	9,273
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	55,794
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	68,005
2019	87,978
2018	33,825
2017	11,356
2016	0
Prior	1,915
Revolving Loans	42,020
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	245,099
Commercial | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	66,853
2019	87,978
2018	33,825
2017	11,356
2016	0
Prior	1,915
Revolving Loans	42,020
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	243,947
Commercial | Lease Financing
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	9,528
2019	22,114
2018	16,841
2017	5,444
2016	11,432
Prior	47,828
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	113,187
Commercial | Lease Financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	9,492
2019	22,039
2018	15,672
2017	5,390
2016	11,303
Prior	47,828
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	111,724
Commercial | Lease Financing | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	36
2019	75
2018	1,169
2017	54
2016	129
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	1,463
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	684,927
2019	1,085,124
2018	709,614
2017	719,245
2016	710,859
Prior	1,200,257
Revolving Loans	1,627,853
Revolving Loans Converted to Term Loans	44,732
Total Loans and Leases	6,782,611
Consumer | Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	529,394
2019	666,174
2018	404,470
2017	570,927
2016	650,609
Prior	1,167,819
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	3,989,393
Consumer | Residential Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	529,394
2019	666,174
2018	404,470
2017	569,995
2016	650,609
Prior	1,162,732
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	3,983,374
Consumer | Residential Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	0
2019	0
2018	0
2017	932
2016	0
Prior	5,087
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	6,019
Consumer | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	5,635
Revolving Loans	1,592,155
Revolving Loans Converted to Term Loans	43,097
Total Loans and Leases	1,640,887
Consumer | Home Equity Loan [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	5,563
Revolving Loans	1,587,454
Revolving Loans Converted to Term Loans	41,957
Total Loans and Leases	1,634,974
Consumer | Home Equity Loan [Member] | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	72
Revolving Loans	4,701
Revolving Loans Converted to Term Loans	1,140
Total Loans and Leases	5,913
Consumer | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	104,123
2019	248,977
2018	191,890
2017	88,589
2016	45,398
Prior	21,725
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	700,702
Consumer | Automobile | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	104,123
2019	248,977
2018	191,876
2017	88,540
2016	45,333
Prior	21,721
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	700,570
Consumer | Automobile | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	0
2019	0
2018	14
2017	49
2016	65
Prior	4
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	132
Consumer | Other Loans
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	51,410
2019	169,973
2018	113,254
2017	59,729
2016	14,852
Prior	5,078
Revolving Loans	35,698
Revolving Loans Converted to Term Loans	1,635
Total Loans and Leases	451,629
Consumer | Other Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	51,410
2019	169,940
2018	113,204
2017	59,637
2016	14,852
Prior	5,078
Revolving Loans	35,615
Revolving Loans Converted to Term Loans	1,596
Total Loans and Leases	451,332
Consumer | Other Loans | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD June 30, 2020	0
2019	33
2018	50
2017	92
2016	0
Prior	0
Revolving Loans	83
Revolving Loans Converted to Term Loans	39
Total Loans and Leases	$ 297