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Allowance for Credit Losses and Credit Quality - Balance Of Impaired Loans and Leases With and Without Allowances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           $ 251,943
Loan and Lease Balance           176,537
Related Allowance Recorded           7,237
Average Loan and Lease Balance   $ 334,085 $ 144,900 $ 273,189 $ 143,863  
Interest Income Recognized   8,939 277 17,921 754  
Commercial            
Financing Receivable, Impaired [Line Items]            
Average Loan and Lease Balance   213,613 62,487 173,635 65,816  
Interest Income Recognized   5,027 130 12,296 375  
Impaired Loans With Valuation Allowance            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           68,965
Loan and Lease Balance           66,049
Related Allowance Recorded           7,237
Impaired Loans With Valuation Allowance | Commercial            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           35,250
Loan and Lease Balance           35,008
Related Allowance Recorded           5,769
Impaired Loans With Valuation Allowance | Commercial | Commercial and industrial            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           20,069
Loan and Lease Balance           20,090
Related Allowance Recorded           2,844
Impaired Loans With Valuation Allowance | Commercial | Commercial real estate            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           4,225
Loan and Lease Balance           3,962
Related Allowance Recorded           333
Impaired Loans With Valuation Allowance | Commercial | Lease financing            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           10,956
Loan and Lease Balance           10,956
Related Allowance Recorded           2,592
Impaired Loans With Valuation Allowance | Consumer            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           33,715
Loan and Lease Balance           31,041
Related Allowance Recorded           1,468
Impaired Loans With Valuation Allowance | Consumer | Residential mortgage            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           24,297
Loan and Lease Balance           22,250
Related Allowance Recorded           1,030
Impaired Loans With Valuation Allowance | Consumer | Home equity            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           9,418
Loan and Lease Balance           8,791
Related Allowance Recorded           438
Impaired Loans With No Valuation Allowance            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           182,978
Loan and Lease Balance           110,488
Related Allowance Recorded           0
Impaired Loans With No Valuation Allowance | Commercial            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           125,032
Loan and Lease Balance           80,835
Related Allowance Recorded           0
Impaired Loans With No Valuation Allowance | Commercial | Commercial and industrial            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           55,889
Loan and Lease Balance           39,098
Average Loan and Lease Balance   119,338 36,761 97,153 40,550  
Interest Income Recognized   2,544 40 6,212 162  
Impaired Loans With No Valuation Allowance | Commercial | Commercial real estate            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           69,143
Loan and Lease Balance           41,737
Related Allowance Recorded           0
Average Loan and Lease Balance   63,885 13,531 49,993 15,518  
Interest Income Recognized   2,452 35 5,982 97  
Impaired Loans With No Valuation Allowance | Commercial | Lease financing            
Financing Receivable, Impaired [Line Items]            
Average Loan and Lease Balance   30,390 12,195 26,489 9,748  
Interest Income Recognized   31 55 102 116  
Impaired Loans With No Valuation Allowance | Consumer            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           57,946
Loan and Lease Balance           29,653
Related Allowance Recorded           0
Average Loan and Lease Balance   120,472 82,413 99,554 78,047  
Interest Income Recognized   3,912 147 5,625 379  
Impaired Loans With No Valuation Allowance | Consumer | Residential mortgage            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           31,142
Loan and Lease Balance           22,594
Average Loan and Lease Balance   66,498 41,788 51,906 40,963  
Interest Income Recognized   769 68 2,133 205  
Impaired Loans With No Valuation Allowance | Consumer | Home equity            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           24,709
Loan and Lease Balance           6,179
Average Loan and Lease Balance   49,872 35,991 44,023 32,476  
Interest Income Recognized   3,000 79 3,283 174  
Impaired Loans With No Valuation Allowance | Consumer | Consumer installment            
Financing Receivable, Impaired [Line Items]            
Unpaid Contractual Balance           2,095
Loan and Lease Balance           $ 880
Average Loan and Lease Balance   4,102 4,634 3,625 4,608  
Interest Income Recognized   $ 143 $ 0 $ 209 $ 0  
Cumulative Effect, Period of Adoption, Adjustment            
Financing Receivable, Impaired [Line Items]            
Reclassification of previous purchased credit impaired loans $ 73,400