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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)		3 Months Ended		9 Months Ended
	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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