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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) |  | 3 Months Ended | 9 Months Ended
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Jul. 01, 2024 loan | Sep. 30, 2025 USD ($) borrower | Sep. 30, 2024 USD ($) borrower | Sep. 30, 2025 USD ($) customer borrower | Sep. 30, 2024 USD ($) borrower
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Amount of loan on which review have been made annually |  | $ 2,000,000.0 |  | $ 2,000,000.0 |
Amount of loan on which reviews require approval |  | 500,000 |  | $ 500,000 |
Loans that are deemed impaired, number of days past due (more than) |  |  |  | 90 days |
Appraisals, required period interval |  |  |  | 18 months |
Minimum amount on which annual updated appraisals for classified loans is required |  | $ 250,000 |  | $ 250,000 |
Number of borrowers experiencing financial difficulty that were given contract modifications | borrower |  | 2 | 3 | 5 | 3
Customer, commitment to lend to previously modified loans | customer |  |  |  | 1 |
Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modified, accumulated |  | $ 350,000 |  | $ 350,000 |
Financing receivable, outstanding loan balance |  |  |  | $ 293,000 |
90+ Days Past Due |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modified, accumulated |  |  | $ 295,000 |  | $ 295,000
Codorus Valley |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
FDM loans acquired | loan | 3 |  |  |  |
Maximum |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Percentage of loan-to-value ratio upon loan origination |  |  |  | 80.00% |
Percentage of loan-to-value ratios of the value of the real estate taken as collateral |  |  |  | 85.00% |
Percentage of strong loan-to-value (or lower) |  |  |  | 70.00% |

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