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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
12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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   $ 423,480 137,788 $ 112,250
Interest Income Recognized   31,769 5,514 1,351
Commercial Loan and Lease Portfolio        
Financing Receivable, Impaired [Line Items]        
Average Loan and Lease Balance   299,602 66,538 33,282
Interest Income Recognized   22,094 4,431 400
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 Loan and Lease Portfolio        
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 Loan and Lease Portfolio | 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 Loan and Lease Portfolio | 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 Loan and Lease Portfolio | 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 Loan Portfolio        
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 Loan Portfolio | 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 Loan Portfolio | 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 Loan and Lease Portfolio        
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 Loan and Lease Portfolio | Commercial and industrial        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Balance     55,889  
Loan and Lease Balance     39,098  
Related Allowance Recorded     0  
Average Loan and Lease Balance   156,626 39,937 18,510
Interest Income Recognized   10,288 1,844 324
Impaired Loans With No Valuation Allowance | Commercial Loan and Lease Portfolio | 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   92,087 17,127 5,652
Interest Income Recognized   11,562 2,435 0
Impaired Loans With No Valuation Allowance | Commercial Loan and Lease Portfolio | Lease financing        
Financing Receivable, Impaired [Line Items]        
Average Loan and Lease Balance   50,889 9,474 9,120
Interest Income Recognized   244 152 76
Impaired Loans With No Valuation Allowance | Consumer Loan Portfolio        
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   123,878 71,250 78,968
Interest Income Recognized   9,675 1,083 951
Impaired Loans With No Valuation Allowance | Consumer Loan Portfolio | Residential mortgage        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Balance     31,142  
Loan and Lease Balance     22,594  
Related Allowance Recorded     0  
Average Loan and Lease Balance   68,115 35,843 47,529
Interest Income Recognized   3,342 640 680
Impaired Loans With No Valuation Allowance | Consumer Loan Portfolio | Home equity        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Balance     24,709  
Loan and Lease Balance     6,179  
Related Allowance Recorded     0  
Average Loan and Lease Balance   52,623 30,759 7,974
Interest Income Recognized   6,034 406 0
Impaired Loans With No Valuation Allowance | Consumer Loan Portfolio | Consumer installment        
Financing Receivable, Impaired [Line Items]        
Unpaid Contractual Balance     2,095  
Loan and Lease Balance     880  
Related Allowance Recorded     0  
Average Loan and Lease Balance   3,140 4,648 23,465
Interest Income Recognized   $ 299 $ 37 $ 271
Cumulative Effect, Period of Adoption, Adjustment        
Financing Receivable, Impaired [Line Items]        
Reclassification of previous purchased credit impaired loans $ 73,400