Loans, Allowance for Credit Losses and Credit Quality - Amortized Cost of Loan Modifications (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 26,483	$ 29,128
Other-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	0	9,818
Combination - Interest Rate Reduction and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	0	44
Term Extension and Other-Than Insignificant Payment Delay [Domain]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	8,822	8,822
Commercial Real Estate [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 15,921	$ 18,461
% of Total Class of Financing Receivable	0.20%	0.24%
Commercial Real Estate [Member] | Other-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 7,013
% of Total Class of Financing Receivable	0.00%	0.09%
Commercial Real Estate [Member] | Term Extension and Other-Than Insignificant Payment Delay [Domain]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 6,857	$ 6,857
% of Total Class of Financing Receivable	0.09%	0.09%
Small Business [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 105
% of Total Class of Financing Receivable	0.00%	0.04%
Small Business [Member] | Combination - Interest Rate Reduction and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 44
% of Total Class of Financing Receivable	0.00%	0.02%
Commercial And Industrial [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 8,193	$ 8,193
% of Total Class of Financing Receivable	0.48%	0.48%
Commercial And Industrial [Member] | Other-Than-Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 2,805
% of Total Class of Financing Receivable	0.00%	0.16%
Commercial And Industrial [Member] | Term Extension and Other-Than Insignificant Payment Delay [Domain]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 1,965	$ 1,965
% of Total Class of Financing Receivable	0.11%	0.11%
Construction Loans [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 2,369	$ 2,369
% of Total Class of Financing Receivable	0.23%	0.23%