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Acquisitions, Salisbury Bancorp, Inc. (Details) shares in Thousands, $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 11, 2023 USD ($) Office shares | Dec. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Recognized amounts of identifiable assets acquired and (liabilities) assumed [Abstract] |  |  |  |
Goodwill |  | $ 361,851 | $ 362,010 |
Salisbury Bancorp, Inc [Member] |  |  |  |
Acquisition of Salisbury Bancorp, Inc. [Abstract] |  |  |  |
Number of banking offices | Office | 13 |  |  |
Common stock issued (in shares) | shares | 4,320 |  |  |
Increase in goodwill |  | $ 1,700 |  |
Consideration [Abstract] |  |  |  |
Cash paid to shareholders (fractional shares) | $ 15 |  |  |
Common stock issuance | 161,723 |  |  |
Total net consideration | 161,738 |  |  |
Recognized amounts of identifiable assets acquired and (liabilities) assumed [Abstract] |  |  |  |
Cash and cash equivalents | 48,665 |  |  |
Securities available for sale | 122,667 |  |  |
Loans, net of allowance for credit losses on purchased credit deteriorated loans | 1,174,237 |  |  |
Premises and equipment, net | 13,026 |  |  |
Bank owned life insurance | 30,315 |  |  |
Other assets | 37,631 |  |  |
Total identifiable assets acquired | 1,462,383 |  |  |
Deposits | (1,308,976) |  |  |
Borrowings | (55,461) |  |  |
Other liabilities | (15,949) |  |  |
Total liabilities assumed | (1,380,386) |  |  |
Total identifiable assets, net | 81,997 |  |  |
Goodwill | 79,741 |  |  | $ 78,100
Salisbury Bancorp, Inc [Member] | Core Deposits [Member] |  |  |  |
Recognized amounts of identifiable assets acquired and (liabilities) assumed [Abstract] |  |  |  |
Intangibles | 31,188 |  |  |
Salisbury Bancorp, Inc [Member] | Wealth Management Customer [Member] |  |  |  |
Recognized amounts of identifiable assets acquired and (liabilities) assumed [Abstract] |  |  |  |
Intangibles | $ 4,654 |  |  |

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