Allowance for Credit Losses and Credit Quality - Summary of Defaulted TDR Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	$ 5,592	$ 4,237	$ 9,949
Commercial Loan and Lease Portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	2,420	956	4,697
Commercial Loan and Lease Portfolio | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	827	956	4,697
Commercial Loan and Lease Portfolio | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	1,593	0	0
Consumer Loan Portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	3,172	3,281	5,252
Consumer Loan Portfolio | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	1,756	1,325	3,258
Consumer Loan Portfolio | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	1,372	401	558
Consumer Loan Portfolio | Consumer installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Defaulted TDR loan balances modified during the applicable period	$ 44	$ 1,555	$ 1,436