MERGER - Narrative (Details) $ / shares in Units, $ in Thousands		6 Months Ended	12 Months Ended
	Jul. 01, 2024 USD ($) $ / shares shares	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares	Jun. 28, 2024 $ / shares	Dec. 31, 2023 USD ($)
Business Combination [Line Items]
Common stock, stated value (in dollars per share) | $ / shares			$ 0.05205	$ 0.05205
Goodwill			$ 69,751	$ 68,106		$ 18,724
Adjustments to acquired goodwill			$ 1,645	$ 0
Codorus Valley Bancorp, Inc
Business Combination [Line Items]
Consideration transferred	$ 233,400
Goodwill	$ 49,400	$ 51,000
Adjustments to acquired goodwill		$ 1,600
Expected life (in years)	10 years
Estimated useful life (in years)	40 years
Operating lease assets acquired	$ 5,100
Operating lease liabilities acquired	5,100
Finance lease asset acquired	392
Finance lease liability acquired	392
Fair value adjustments of operating lease assets	(1,100)
Fair value adjustments of finance lease assets	(133)
Adjustments to deposits	3,200
Codorus Valley Bancorp, Inc | Subordinated notes
Business Combination [Line Items]
Debt instrument, unamortized discount	2,400
Codorus Valley Bancorp, Inc | Junior Subordinated Debt
Business Combination [Line Items]
Debt instrument, unamortized discount	2,700
Codorus Valley Bancorp, Inc | Premises And Equipment
Business Combination [Line Items]
Adjustment to premises and equipment	6,600
Codorus Valley Bancorp, Inc | Core deposit intangible
Business Combination [Line Items]
Other intangible assets, net	40,100
Codorus Valley Bancorp, Inc | Customer relationships
Business Combination [Line Items]
Other intangible assets, net	$ 10,600
Expected life (in years)	7 years
Codorus Valley Bancorp, Inc | Orrstown Financial Services Inc
Business Combination [Line Items]
Common stock, no par value (usd per share) | $ / shares	$ 0
Shares issued for common stock (in shares) | shares	8,532,038
Share price (usd per share) | $ / shares					$ 27.36
Pending Acquisition, Codorus Valley Bancorp, Inc | Common Stock
Business Combination [Line Items]
Business combination, shares of common stock to be received by acquiree for number of shares outstanding	0.875
Pending Acquisition, Codorus Valley Bancorp, Inc | Common Stock | Codorus Valley Bancorp, Inc
Business Combination [Line Items]
Common stock, stated value (in dollars per share) | $ / shares	$ 2.50