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MERGER - Narrative (Details) $ / shares in Units, $ in Thousands	Jul. 01, 2024 USD ($) branch $ / shares shares	Sep. 30, 2024 USD ($) $ / shares	Aug. 05, 2024 branch	Jun. 28, 2024 $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Common stock, stated value (usd per share) | $ / shares		$ 0.05205			$ 0.05205
Full service branches | branch			38
Limited purpose branches | branch			7
Total bank branch closures | branch			6
Goodwill		$ 70,655			$ 18,724	$ 18,724
Codorus Valley
Business Acquisition [Line Items]
Full service branches | branch	22
Limited purpose branches | branch	8
Consideration transferred	$ 233,400
Goodwill	$ 51,900
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 | Premises And Equipment
Business Acquisition [Line Items]
Adjustment to premises and equipment	6,600
Codorus Valley | Core deposit intangible
Business Acquisition [Line Items]
Other intangible assets, net	35,900
Codorus Valley | Customer relationship
Business Acquisition [Line Items]
Other intangible assets, net	$ 10,400
Expected life (in years)	10 years
Codorus Valley | Subordinated notes
Business Acquisition [Line Items]
Debt instrument, unamortized discount	$ 2,400
Codorus Valley | Junior Subordinated Debt
Business Acquisition [Line Items]
Debt instrument, unamortized discount	$ 2,700
Codorus Valley | 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
Codorus Valley | Common Stock
Business Acquisition [Line Items]
Business combination, shares of common stock to be received by acquiree for number of shares outstanding	0.875
Codorus Valley | Common Stock | Codorus Valley
Business Acquisition [Line Items]
Common stock, stated value (usd per share) | $ / shares	$ 2.50

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