Loans, Allowance for Credit Losses and Credit Quality - Amortized Cost of Loan Modifications (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 2,645
Other-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	9,818
Combination - Interest Rate Reduction and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	44
Commercial Real Estate [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 2,540
% of Total Class of Financing Receivable	0.03%
Commercial Real Estate [Member] | Other-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 7,013
% of Total Class of Financing Receivable	0.09%
Small Business [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 105
% of Total Class of Financing Receivable	0.05%
Small Business [Member] | Combination - Interest Rate Reduction and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 44
% of Total Class of Financing Receivable	0.02%
Commercial And Industrial [Member] | Other-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 2,805
% of Total Class of Financing Receivable	0.17%