Loans and Leases and the Allowance for Loan and Lease Losses (Credit Quality Indicators by Year of Origination) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	$ 765,372
2019	2,130,793
2018	1,482,924
2017	1,233,613
2016	1,185,676
Prior	2,116,189
Revolving Loans	2,390,521
Revolving Loans Converted to Term Loans	47,692
Total Loans and Leases	11,352,780
Revolving loans, converted to term loan during the period	600
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	443,731
2019	978,587
2018	704,845
2017	439,225
2016	437,800
Prior	814,757
Revolving Loans	710,334
Revolving Loans Converted to Term Loans	1,290
Total Loans and Leases	4,530,569
Commercial | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	161,330
2019	275,910
2018	216,666
2017	95,769
2016	88,538
Prior	129,583
Revolving Loans	589,146
Revolving Loans Converted to Term Loans	1,290
Total Loans and Leases	1,558,232
Commercial | Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	160,663
2019	253,285
2018	212,901
2017	93,614
2016	87,982
Prior	108,952
Revolving Loans	557,732
Revolving Loans Converted to Term Loans	1,122
Total Loans and Leases	1,476,251
Commercial | Commercial and Industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	62
2019	508
2018	2,087
2017	700
2016	116
Prior	152
Revolving Loans	19,345
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	22,970
Commercial | Commercial and Industrial | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	605
2019	22,117
2018	1,678
2017	1,455
2016	440
Prior	20,479
Revolving Loans	12,069
Revolving Loans Converted to Term Loans	168
Total Loans and Leases	59,011
Commercial | Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	225,358
2019	597,288
2018	424,611
2017	317,292
2016	337,108
Prior	633,550
Revolving Loans	81,036
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	2,616,243
Commercial | Commercial Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	209,933
2019	591,055
2018	396,239
2017	302,711
2016	329,045
Prior	602,337
Revolving Loans	81,036
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	2,512,356
Commercial | Commercial Mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	3,961
2019	820
2018	19,919
2017	13,176
2016	7,359
Prior	7,884
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	53,119
Commercial | Commercial Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	11,464
2019	5,413
2018	8,453
2017	1,405
2016	704
Prior	23,329
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	50,768
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	54,220
2019	81,985
2018	45,600
2017	20,336
2016	0
Prior	3,097
Revolving Loans	40,152
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	245,390
Commercial | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	54,220
2019	81,985
2018	45,600
2017	20,336
2016	0
Prior	1,936
Revolving Loans	40,152
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	244,229
Commercial | Construction | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	1,161
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	1,161
Commercial | Lease Financing
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	2,823
2019	23,404
2018	17,968
2017	5,828
2016	12,154
Prior	48,527
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	110,704
Commercial | Lease Financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	2,785
2019	23,324
2018	16,762
2017	5,767
2016	12,007
Prior	48,527
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	109,172
Commercial | Lease Financing | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	0
2018	0
2017	2
2016	34
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	36
Commercial | Lease Financing | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	38
2019	80
2018	1,206
2017	59
2016	113
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	1,496
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	321,641
2019	1,152,206
2018	778,079
2017	794,388
2016	747,876
Prior	1,301,432
Revolving Loans	1,680,187
Revolving Loans Converted to Term Loans	46,402
Total Loans and Leases	6,822,211
Consumer | Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	212,313
2019	704,271
2018	445,511
2017	626,091
2016	678,049
Prior	1,261,948
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	3,928,183
Consumer | Residential Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	212,313
2019	704,271
2018	445,511
2017	625,159
2016	678,049
Prior	1,258,545
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	3,923,848
Consumer | Residential Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	0
2018	0
2017	932
2016	0
Prior	3,403
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	4,335
Consumer | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	6,348
Revolving Loans	1,641,055
Revolving Loans Converted to Term Loans	44,751
Total Loans and Leases	1,692,154
Consumer | Home Equity Loan [Member] | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	6,245
Revolving Loans	1,637,082
Revolving Loans Converted to Term Loans	43,589
Total Loans and Leases	1,686,916
Consumer | Home Equity Loan [Member] | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	0
2018	0
2017	0
2016	0
Prior	103
Revolving Loans	3,973
Revolving Loans Converted to Term Loans	1,162
Total Loans and Leases	5,238
Consumer | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	63,914
2019	265,698
2018	208,439
2017	99,244
2016	51,925
Prior	26,994
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	716,214
Consumer | Automobile | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	63,914
2019	265,516
2018	208,273
2017	98,987
2016	51,746
Prior	26,912
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	715,348
Consumer | Automobile | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	182
2018	166
2017	257
2016	179
Prior	82
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total Loans and Leases	866
Consumer | Other Loans
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	45,414
2019	182,237
2018	124,129
2017	69,053
2016	17,902
Prior	6,142
Revolving Loans	39,132
Revolving Loans Converted to Term Loans	1,651
Total Loans and Leases	485,660
Consumer | Other Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	45,414
2019	181,911
2018	123,803
2017	68,751
2016	17,783
Prior	6,098
Revolving Loans	39,053
Revolving Loans Converted to Term Loans	1,643
Total Loans and Leases	484,456
Consumer | Other Loans | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
YTD March 31, 2020	0
2019	326
2018	326
2017	302
2016	119
Prior	44
Revolving Loans	79
Revolving Loans Converted to Term Loans	8
Total Loans and Leases	$ 1,204