Allowance for Credit Losses and Credit Quality - Summary of TDR Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	$ 70,529	$ 98,734
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	33,675	59,272
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	36,854	39,462
Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	29,275	52,355
Accruing TDR Loans | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	12,121	35,697
Accruing TDR Loans | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	17,154	16,658
Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	41,254	46,379
Nonaccrual TDR Loans | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	21,554	23,575
Nonaccrual TDR Loans | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	$ 19,700	$ 22,804