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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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