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Borrowings (Summary of Short term and Long term Borrowings and Subordinated Debentures) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |  |
FHLBB borrowings |  | $ 25,000 |
Securities Sold under Agreements to Repurchase |  | $ 237,984 | $ 245,868
FHLBB borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) |  | 1.87% | 1.87%
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months |  | $ 10,000 |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2018 |  | 25,000 |
2019 |  | 0 |
2020 |  | 0 |
Customer repurchase agreements |  |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2018 |  | 237,984 |
FHLBB and correspondent bank overnight borrowings |  |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2018 |  | $ 5,825 |
Capital lease obligation |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) | [1] | 0.00% | 4.20%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2018 | [1] | $ 0 |
2019 | [1] | 0 |
2020 | [1] | 0 |
2021 | [1] | 0 |
2022 | [1] | 0 |
Thereafter | [1] | $ 0 |
Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) |  | 1.87% | 2.19%
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months |  | $ 10,000 |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2019 |  | 0 |
2020 |  | 0 |
2021 |  | 0 |
2022 |  | 0 |
Thereafter |  | 0 |
Total long-term borrowings |  | $ 10,000 | $ 11,580
Long-term Debt | FHLBB borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) |  | 1.87% | 1.87%
Subordinated Debt and Junior Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) |  | 5.35% | 5.23%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
Thereafter |  | $ 59,080 |
Total long-term borrowings |  | $ 59,080 | $ 59,067
Subordinated Debt | Subordinated debentures |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) | [2] | 5.50% | 5.50%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
Thereafter | [2] | $ 14,749 |
Total long-term borrowings | [2] | 14,749 | $ 14,634
Debt Issuance Costs, Net |  | 251 | 366
Short-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total short-term borrowings |  | $ 268,809 | $ 270,868
Weighted Average Rate (as a percent) |  | 1.28% | 1.43%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
2018 |  | $ 268,809 |
Short-term Debt | FHLBB borrowings |  |  |
Debt Instrument [Line Items] |  |  |
FHLBB borrowings |  | $ 25,000 | $ 25,000
Weighted Average Rate (as a percent) |  | 1.79% | 2.71%
Short-term Debt | Customer repurchase agreements |  |  |
Debt Instrument [Line Items] |  |  |
Securities Sold under Agreements to Repurchase |  | $ 237,984 | $ 245,868
Short-term Debt | FHLBB and correspondent bank overnight borrowings |  |  |
Debt Instrument [Line Items] |  |  |
FHLBB and correspondent bank overnight borrowings |  | 5,825 | 0
Long-term Debt | FHLBB borrowings |  |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
Long-term Federal Home Loan Bank Advances |  | 10,000 | 10,000
Long-term Debt | Capital lease obligation |  |  |
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
Capital lease obligation | [1] | $ 0 | $ 1,580
Subsidiary One [Member] | Junior Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Rate (as a percent) |  | 5.50% | 5.38%
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) |  | 4.45% | 4.14%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract] |  |  |
Thereafter |  | $ 8,248 |
Total long-term borrowings |  | $ 8,248 | $ 8,350
[1] | (1)Upon adoption of ASU 2016-02, effective January 1, 2019, lease liabilities are presented within other liabilities on the consolidated statements of condition. Refer to Notes 1 and 6 for further information.
[2] | (2)The outstanding balance of subordinated debentures was presented net of debt issuance costs of $251,000 and $366,000 at December 31, 2019 and 2018, respectively.

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