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Borrowings (Summary of Short term and Long term Borrowings and Subordinated Debentures) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Securities Sold under Agreements to Repurchase | $ 211,608 | $ 162,439 |
Total short-term borrowings | $ 211,608 | $ 162,439 |
FHLBB Borrowings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) | 0.00% | 0.98% |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months | $ 0 |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2022 | 0 |  |
2023 | 0 |  |
2025 | 0 |  |
Customer repurchase agreements |  |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2021 | 211,608 |  |
FHLBB and correspondent bank overnight borrowings |  |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2021 | $ 0 |  |
Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) | 0.00% | 0.98% |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months | $ 0 |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2022 | 0 |  |
2023 | 0 |  |
2024 |  |  |
2025 | 0 |  |
Thereafter | 0 |  |
Total long-term borrowings | $ 0 | $ 25,000 |
Subordinated Debt and Junior Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) | 5.50% | 5.50% |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2025 | $ 0 |  |
Thereafter | 44,331 |  |
Total long-term borrowings | $ 44,331 | $ 59,331 |
Subordinated Debt | Subordinated debentures |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) | 0.00% | 5.50% |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2025 | $ 0 |  |
Thereafter | 0 |  |
Total long-term borrowings | 0 | $ 15,000 |
Debt Issuance Costs, Net | 0 | 251 | $ 115
Short-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total short-term borrowings | $ 211,608 | $ 162,439 |
Weighted Average Rate (as a percent) | 0.25% | 0.34% |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2021 | $ 211,608 |  |
Short-term Debt | Customer repurchase agreements |  |  |
Debt Instrument [Line Items] |  |  |
Securities Sold under Agreements to Repurchase | $ 211,608 | $ 162,439 |
Weighted Average Rate (as a percent) | 0.25% | 0.34% |
Short-term Debt | FHLBB and correspondent bank overnight borrowings |  |  |
Debt Instrument [Line Items] |  |  |
FHLBB and correspondent bank overnight borrowings | $ 0 | $ 0 |
Weighted Average Rate (as a percent) | 0.00% | 0.00% |
Long-term Debt | FHLBB Borrowings [Member] |  |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
Long-term Federal Home Loan Bank Advances | $ 0 | $ 25,000 |
Subsidiary One [Member] | Junior Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) | 5.50% | 5.50% |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
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) | 5.48% | 5.48% |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
Thereafter | $ 8,248 |  |
Total long-term borrowings | $ 8,248 | $ 8,248 |

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