SHARE-BASED COMPENSATION PLANS - Summary of Nonvested Restricted Shares Activity (Details) - Orrstown 2011 Incentive Stock Plan - Restricted Stock	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Shares
Nonvested shares, beginning of year (in shares) | shares	253,755
Granted (in shares) | shares	161,975
Forfeited (in shares) | shares	0
Vested (in shares) | shares	(70,438)
Nonvested shares, at period end (in shares) | shares	345,292
Weighted Average Grant Date Fair Value
Nonvested shares, beginning of year (in usd per share) | $ / shares	$ 30.47
Granted (in usd per share) | $ / shares	36.66
Forfeited (in usd per share) | $ / shares	0
Vested (in usd per share) | $ / shares	27.31
Nonvested shares, at period end (in usd per share) | $ / shares	$ 34.02