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Goodwill and Core Deposit Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jan. 02, 2025 | Sep. 30, 2025
Goodwill [Roll Forward] |  |
Goodwill, Beginning Balance |  | $ 94,697
Goodwill, Period Increase (Decrease) |  | 56,808
Goodwill, Ending Balance |  | $ 151,505
Finite-Lived Intangible Assets, Remaining Amortization Period |  | 10 years
Northway Financial, Inc "NFI" |  |
Goodwill [Roll Forward] |  |
Goodwill, Period Increase (Decrease) | $ 56,800 |
Goodwill, Ending Balance | $ 56,808 |

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