Allowance for Credit Losses and Credit Quality - Summary of TDR Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	$ 89,679	$ 45,620
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	50,197	18,342
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	39,482	27,278
Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	54,903	25,389
Accruing TDR Loans | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	36,947	12,986
Accruing TDR Loans | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	17,956	12,403
Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	34,776	20,231
Nonaccrual TDR Loans | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	13,250	5,356
Nonaccrual TDR Loans | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	$ 21,526	$ 14,875