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Acquisitions, Evans Bancorp, Inc. (Details) $ in Thousands, shares in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 02, 2025 USD ($) Location shares | Dec. 31, 2024 USD ($) Location | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Recognized amounts of identifiable assets acquired and (liabilities) assumed [Abstract] |  |  |  |
Goodwill |  | $ 362,663 | $ 454,072 | $ 362,010
Evans Bancorp, Inc [Member] |  |  |  |
Acquisition of Evans Bancorp, Inc [Abstract] |  |  |  |
Total consideration | $ 221,792 |  |  |
Assets of the acquiree |  | $ 2,190,000 |  |
Number of banking locations operated by acquiree | Location | 18 | 18 |  |
Common stock issued (in shares) | shares | 5.1 |  |  |
Consideration [Abstract] |  |  |  |
Cash paid to shareholders (fractional shares) | $ 25 |  |  |
Common stock issuance | 221,767 |  |  |
Total net consideration | 221,792 |  |  |
Recognized amounts of identifiable assets acquired and (liabilities) assumed [Abstract] |  |  |  |
Cash and cash equivalents | 40,197 |  |  |
Securities available for sale | 255,487 |  |  |
Securities held to maturity | 3,494 |  |  |
Loans, net of allowance for credit losses on purchased credit deteriorated loans | 1,665,712 |  |  |
Premises and equipment, net | 15,069 |  |  |
Core deposit intangibles | 33,240 |  |  |
Bank owned life insurance | 44,100 |  |  |
Other assets | 70,337 |  |  |
Total identifiable assets acquired | 2,127,636 |  |  |
Deposits | (1,864,049) |  |  |
Borrowings | (113,712) |  |  |
Other liabilities | (19,492) |  |  |
Total liabilities assumed | (1,997,253) |  |  |
Total identifiable assets, net | 130,383 |  |  |
Goodwill | $ 91,409 |  |  |

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