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Borrowings (Summary of Short term and Long term Borrowings and Subordinated Debentures) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Securities Sold under Agreements to Repurchase	$ 200,657	$ 196,451
Total short-term borrowings	485,607	$ 265,176
Customer repurchase agreements(1)
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2024	200,657
2025	0
2026	0
2027	0
2028	0
Thereafter	0
FHLBB and correspondent bank overnight borrowings(2)
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2024	149,950
2025	0
2026	0
2027	0
2028	0
Thereafter	0
Bank term funding program
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2024	135,000
2025	0
2026	0
2027	0
2028	0
Thereafter	$ 0
Subordinated Debt and Junior Subordinated Debt
Debt Instrument [Line Items]
Weighted Average Rate (as a percent)	4.79%	4.76%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2024	$ 0
2025	0
2026	0
2027	0
2028	0
Thereafter	44,331
Total long-term borrowings	44,331	$ 44,331
Short-term Debt
Debt Instrument [Line Items]
Total short-term borrowings	$ 485,607	$ 265,176
Weighted Average Rate (as a percent)	3.66%	1.98%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2024	$ 485,607
2025	0
2026	0
2027	0
2028	0
Thereafter	0
Short-term Debt | Customer repurchase agreements(1)
Debt Instrument [Line Items]
Securities Sold under Agreements to Repurchase	$ 200,657	$ 196,451
Weighted Average Rate (as a percent)	1.56%	1.00%
Short-term Debt | FHLBB and correspondent bank overnight borrowings(2)
Debt Instrument [Line Items]
FHLBB and correspondent bank overnight borrowings	$ 149,950	$ 68,725
Weighted Average Rate (as a percent)	5.53%	4.78%
Short-term Debt | Bank term funding program
Debt Instrument [Line Items]
FHLBB and correspondent bank overnight borrowings	$ 135,000	$ 0
Weighted Average Rate (as a percent)	4.70%	0.00%
Subsidiary One [Member] | Junior Subordinated Debt
Debt Instrument [Line Items]
Weighted Average Rate (as a percent)	4.82%	4.62%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2024	$ 0
2025	0
2026	0
2027	0
2028	0
Thereafter	36,083
Total long-term borrowings	$ 36,083	$ 36,083
Subsidiary Two [Member] | Junior Subordinated Debt
Debt Instrument [Line Items]
Weighted Average Rate (as a percent)	4.65%	5.39%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2024	$ 0
2025	0
2026	0
2027	0
2028	0
Thereafter	8,248
Total long-term borrowings	$ 8,248	$ 8,248

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