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MERGER - Summary of Consideration Paid and Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2024 | Sep. 30, 2025 | Dec. 31, 2024
Fair Value Adjustment |  |  |
Goodwill |  | $ 1,645 | $ 0
Codorus Valley |  |  |
Business Combination [Line Items] |  |  |
Total purchase price consideration | $ 233,437 |  |
Fair Value Adjustment |  |  |
Cash and cash equivalents | (31) |  |
Securities available for sale | (4,532) |  |
Loans, net of allowance for credit losses ("ACL") | (72,368) |  |
Premises and equipment, net | 6,551 |  |
Accrued interest receivable | 79 |  |
Goodwill | (2,301) |  |
Other intangible assets, net | 50,719 |  |
Deferred income tax asset, net | 3,088 |  |
Other assets | (2,781) |  |
Total identifiable assets acquired | (21,576) |  |
Deposits | (3,218) |  |
FHLB advances and other borrowings | (803) |  |
Subordinated notes and trust preferred debt | (4,983) |  |
Other liabilities | 3,241 |  |
Total liabilities assumed | (5,763) |  |
Total identifiable net assets | (15,813) |  |
Codorus Valley | Book Value |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed |  |  |
Cash and cash equivalents | 45,290 |  |
Restricted investments in bank stocks | 1,168 |  |
Securities available for sale | 331,032 |  |
Loans, net of allowance for credit losses ("ACL") | 1,715,761 |  |
Premises and equipment, net | 17,553 |  |
Cash surrender value of life insurance | 62,817 |  |
Accrued interest receivable | 8,138 |  |
Goodwill | 2,301 |  |
Other intangible assets, net | 0 |  |
Deferred income tax asset, net | 16,969 |  |
Other assets | 21,024 |  |
Total identifiable assets acquired | 2,222,053 |  |
Deposits | 1,948,467 |  |
Securities sold under agreements to repurchase | 7,943 |  |
FHLB advances and other borrowings | 1,195 |  |
Subordinated notes and trust preferred debt | 41,195 |  |
Other liabilities | 25,030 |  |
Total liabilities assumed | 2,023,830 |  |
Total identifiable net assets | 198,223 |  |
Codorus Valley | Fair Value |  |  |
Business Combination [Line Items] |  |  |
Total purchase price consideration | 233,437 |  |
Recognized amounts of identifiable assets acquired and liabilities assumed |  |  |
Cash and cash equivalents | 45,259 |  |
Restricted investments in bank stocks | 1,168 |  |
Securities available for sale | 326,500 |  |
Loans, net of allowance for credit losses ("ACL") | 1,643,393 |  |
Premises and equipment, net | 24,104 |  |
Cash surrender value of life insurance | 62,817 |  |
Accrued interest receivable | 8,217 |  |
Other intangible assets, net | 50,719 |  |
Deferred income tax asset, net | 20,057 |  |
Other assets | 18,243 |  |
Total identifiable assets acquired | 2,200,477 |  |
Deposits | 1,945,249 |  |
Securities sold under agreements to repurchase | 7,943 |  |
FHLB advances and other borrowings | 392 |  |
Subordinated notes and trust preferred debt | 36,212 |  |
Other liabilities | 28,271 |  |
Total liabilities assumed | 2,018,067 |  |
Total identifiable net assets | 182,410 |  |
Goodwill | $ 51,027 |  |

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