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Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]  
Minimum number of days past due for loans to be considered nonperforming 90 days
Credit Quality by Loan Class by Vintage [Abstract]  
2020 $ 1,297,018
2019 1,491,043
2018 1,086,557
2017 888,249
2016 598,519
Prior 1,459,207
Revolving Loans Amortized Cost Basis 790,186
Revolving Loans Converted to Term 17,212
Total 7,627,991
Commercial & Industrial [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 190,302
2019 234,986
2018 125,966
2017 70,724
2016 52,195
Prior 53,049
Revolving Loans Amortized Cost Basis 400,652
Revolving Loans Converted to Term 977
Total 1,128,851
Commercial & Industrial [Member] | Pass [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 188,416
2019 215,181
2018 109,174
2017 61,336
2016 46,937
Prior 42,658
Revolving Loans Amortized Cost Basis 361,229
Revolving Loans Converted to Term 976
Total 1,025,907
Commercial & Industrial [Member] | Special Mention [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 700
2019 16,231
2018 7,001
2017 5,833
2016 4,111
Prior 3,923
Revolving Loans Amortized Cost Basis 30,708
Revolving Loans Converted to Term 0
Total 68,507
Commercial & Industrial [Member] | Substandard [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 1,186
2019 3,574
2018 9,791
2017 3,336
2016 1,147
Prior 6,468
Revolving Loans Amortized Cost Basis 8,715
Revolving Loans Converted to Term 1
Total 34,218
Commercial & Industrial [Member] | Doubtful [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 0
2019 0
2018 0
2017 219
2016 0
Prior 0
Revolving Loans Amortized Cost Basis 0
Revolving Loans Converted to Term 0
Total 219
Commercial Real Estate [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 245,261
2019 446,132
2018 308,270
2017 382,247
2016 271,248
Prior 577,742
Revolving Loans Amortized Cost Basis 104,391
Revolving Loans Converted to Term 703
Total 2,335,994
Commercial Real Estate [Member] | Pass [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 241,844
2019 395,753
2018 263,881
2017 320,976
2016 225,572
Prior 452,302
Revolving Loans Amortized Cost Basis 82,421
Revolving Loans Converted to Term 703
Total 1,983,452
Commercial Real Estate [Member] | Special Mention [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 3,221
2019 45,851
2018 38,192
2017 57,295
2016 41,079
Prior 65,378
Revolving Loans Amortized Cost Basis 10,713
Revolving Loans Converted to Term 0
Total 261,729
Commercial Real Estate [Member] | Substandard [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 196
2019 4,528
2018 6,197
2017 3,976
2016 4,597
Prior 60,062
Revolving Loans Amortized Cost Basis 11,257
Revolving Loans Converted to Term 0
Total 90,813
Paycheck Protection Plan [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 510,097
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans Amortized Cost Basis 0
Revolving Loans Converted to Term 0
Total 510,097
Paycheck Protection Plan [Member] | Pass [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 510,097
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans Amortized Cost Basis 0
Revolving Loans Converted to Term 0
Total 510,097
Auto [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 134,147
2019 382,655
2018 262,727
2017 165,237
2016 73,813
Prior 30,184
Revolving Loans Amortized Cost Basis 24
Revolving Loans Converted to Term 0
Total 1,048,787
Auto [Member] | Performing [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 134,078
2019 381,783
2018 261,558
2017 164,661
2016 73,374
Prior 30,184
Revolving Loans Amortized Cost Basis 24
Revolving Loans Converted to Term 0
Total 1,045,662
Auto [Member] | Nonperforming [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 69
2019 872
2018 1,169
2017 576
2016 439
Prior 0
Revolving Loans Amortized Cost Basis 0
Revolving Loans Converted to Term 0
Total 3,125
Other Consumer [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 107,692
2019 196,838
2018 153,750
2017 70,393
2016 21,715
Prior 22,766
Revolving Loans Amortized Cost Basis 19,077
Revolving Loans Converted to Term 18
Total 592,249
Other Consumer [Member] | Performing [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 107,544
2019 196,607
2018 153,420
2017 70,130
2016 21,537
Prior 22,642
Revolving Loans Amortized Cost Basis 19,065
Revolving Loans Converted to Term 18
Total 590,963
Other Consumer [Member] | Nonperforming [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 148
2019 231
2018 330
2017 263
2016 178
Prior 124
Revolving Loans Amortized Cost Basis 12
Revolving Loans Converted to Term 0
Total 1,286
Residential [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 109,519
2019 230,432
2018 235,844
2017 199,648
2016 179,548
Prior 775,466
Revolving Loans Amortized Cost Basis 266,042
Revolving Loans Converted to Term 15,514
Total 2,012,013
Residential [Member] | Performing [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 109,485
2019 229,947
2018 235,193
2017 198,283
2016 179,197
Prior 766,771
Revolving Loans Amortized Cost Basis 266,042
Revolving Loans Converted to Term 15,514
Total 2,000,432
Residential [Member] | Nonperforming [Member]  
Credit Quality by Loan Class by Vintage [Abstract]  
2020 34
2019 485
2018 651
2017 1,365
2016 351
Prior 8,695
Revolving Loans Amortized Cost Basis 0
Revolving Loans Converted to Term 0
Total $ 11,581