MERGER - Narrative (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Jul. 01, 2024 USD ($) branch $ / shares shares	Dec. 31, 2024 USD ($) $ / shares	Nov. 30, 2024 branch	Jun. 28, 2024 $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Common stock, stated value (in dollars per share) | $ / shares		$ 0.05205			$ 0.05205
Full service branches | branch			38
Limited purpose branches | branch			7
Total bank branch closures | branch			6
Goodwill		$ 68,106			$ 18,724	$ 18,724
Codorus Valley Bancorp, Inc
Business Acquisition [Line Items]
Consideration transferred	$ 233,400
Goodwill	$ 49,400
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 | Premises And Equipment
Business Acquisition [Line Items]
Adjustment to premises and equipment	6,600
Codorus Valley Bancorp, Inc | Core deposit intangible
Business Acquisition [Line Items]
Other intangible assets, net	40,100
Other intangible assets, net		4,300
Deferred tax liabilities		974
Codorus Valley Bancorp, Inc | Customer relationships
Business Acquisition [Line Items]
Other intangible assets, net	$ 10,600
Other intangible assets, net		179
Deferred tax liabilities		$ 41
Expected life (in years)	7 years
Codorus Valley Bancorp, Inc | Customer-related intangibles
Business Acquisition [Line Items]
Expected life (in years)	10 years
Codorus Valley Bancorp, Inc | Subordinated notes
Business Acquisition [Line Items]
Debt instrument, unamortized discount	$ 2,400
Codorus Valley Bancorp, Inc | Junior Subordinated Debt
Business Acquisition [Line Items]
Debt instrument, unamortized discount	$ 2,700
Codorus Valley Bancorp, Inc | Orrstown Financial Services Inc
Business Acquisition [Line Items]
Number of branches operated | branch	51
Bank branch closures | branch			3
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
Business Acquisition [Line Items]
Full service branches | branch	22
Limited purpose branches | branch	8
Pending Acquisition, Codorus Valley Bancorp, Inc | Common Stock
Business Acquisition [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 Acquisition [Line Items]
Common stock, stated value (in dollars per share) | $ / shares	$ 2.50