Loans, Allowance for Credit Losses and Credit Quality - Amortized Cost of Loan Modifications (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 8,634	$ 37,762
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	0	8,822
Commercial Real Estate [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 719	$ 19,180
% of Total Class of Financing Receivable	0.01%	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	$ 0	$ 6,857
% of Total Class of Financing Receivable	0.00%	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	$ 7,915	$ 16,108
% of Total Class of Financing Receivable	0.48%	0.97%
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%	0.17%
Commercial And Industrial [Member] | Term Extension and Other-Than Insignificant Payment Delay [Domain]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 1,965
% of Total Class of Financing Receivable	0.00%	0.12%
Construction Loans [Member] | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 2,369
% of Total Class of Financing Receivable	0.00%	0.25%