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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 57,998	$ 56,446
Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount	$ 10,492	$ 8,634	49,533	37,762
Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			106
Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			200	44
Term Extension and OtherThan Insignificant Payment Delays
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount		8,822	8,159
Other-Than Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount				9,818
Commercial And Industrial [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount	$ 5,985	$ 7,915	$ 8,368	$ 16,108
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	0.38%	0.48%	0.53%	0.97%
Added weighted-average contractual term to the life of the loan	4 months	2 months	7 months	2 months
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 97
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage			0.01%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member] | Maximum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			10.10%
Added weighted-average contractual term to the life of the loan			1 year 6 months
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member] | Minimum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			7.20%
Commercial And Industrial [Member] | Term Extension and OtherThan Insignificant Payment Delays
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 1,809	$ 1,965
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage		0.12%	0.11%
Commercial And Industrial [Member] | Other-Than Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount				$ 2,805
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage				0.17%
Commercial Real Estate [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount	$ 4,507	$ 719	$ 37,380	$ 19,180
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	0.06%	0.01%	0.46%	0.24%
Added weighted-average contractual term to the life of the loan		2 years 10 months 24 days	1 year	1 year 9 months 18 days
Commercial Real Estate [Member] | Term Extension and OtherThan Insignificant Payment Delays
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount		$ 6,857	$ 6,350
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage		0.09%	0.08%
Commercial Real Estate [Member] | Other-Than Insignificant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount				$ 7,013
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage				0.09%
Construction Loans [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 3,488	$ 2,369
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage			0.47%	0.25%
Added weighted-average contractual term to the life of the loan	5 months		10 months	2 months
Residential Real Estate [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 297
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage			0.01%
Added weighted-average contractual term to the life of the loan			6 years 2 months 12 days
Home Equity Loan [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 64
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage			0.01%
Home Equity Loan [Member] | Contractual Interest Rate Reduction [Member] | Maximum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			7.99%
Home Equity Loan [Member] | Contractual Interest Rate Reduction [Member] | Minimum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			7.00%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 69
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage			0.01%
Added weighted-average contractual term to the life of the loan			8 years 1 month 6 days
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction [Member] | Maximum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			10.00%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction [Member] | Minimum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			6.80%
Small Business [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount				$ 105
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage				0.04%
Added weighted-average contractual term to the life of the loan				4 years 3 months 18 days
Small Business [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 42
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage			0.02%
Small Business [Member] | Contractual Interest Rate Reduction [Member] | Maximum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			11.00%
Small Business [Member] | Contractual Interest Rate Reduction [Member] | Minimum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			8.20%
Small Business [Member] | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modified in Period, Amount			$ 34	$ 44
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage			0.01%	0.02%
Added weighted-average contractual term to the life of the loan			2 years 6 months
Small Business [Member] | Extended Maturity and Interest Rate Reduction [Member] | Maximum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			10.25%	10.00%
Small Business [Member] | Extended Maturity and Interest Rate Reduction [Member] | Minimum [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted-average contractual interest rate			6.50%	6.50%

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