SHAREHOLDERS’ EQUITY AND REGULATORY CAPITAL - Schedule of Actual and Required Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Orrstown Financial Services, Inc.
Total risk-based capital:
Actual, Amount	$ 334,597	$ 326,878
Actual, Ratio	0.134	0.130
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 263,098	$ 264,019
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	0.105	0.105
Tier 1 risk-based capital:
Actual, Amount	$ 279,405	$ 272,677
Actual, Ratio	0.112	0.108
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 212,984	$ 213,730
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	0.085	0.085
Tier 1 common equity risk-based capital:
Actual, Amount	$ 279,405	$ 272,677
Actual, Ratio	11.20%	10.80%
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 175,399	$ 176,013
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	7.00%	7.00%
Tier 1 leverage capital:
Actual, Amount	$ 279,405	$ 272,677
Actual, Ratio	0.090	0.089
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 124,560	$ 122,907
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	0.040	0.040
Orrstown Bank
Total risk-based capital:
Actual, Amount	$ 328,644	$ 320,687
Actual, Ratio	0.131	0.128
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 263,020	$ 263,942
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	0.105	0.105
To Be Well Capitalized Under Prompt Corrective Action Regulations, Amount	$ 250,495	$ 251,373
To Be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	0.100	0.100
Tier 1 risk-based capital:
Actual, Amount	$ 299,141	$ 292,160
Actual, Ratio	0.119	0.116
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 212,921	$ 213,667
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	0.085	0.085
To Be Well Capitalized Under Prompt Corrective Action Regulations, Amount	$ 200,396	$ 201,099
To Be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	0.080	0.080
Tier 1 common equity risk-based capital:
Actual, Amount	$ 299,141	$ 292,160
Actual, Ratio	11.90%	11.60%
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 175,347	$ 175,961
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	7.00%	7.00%
To Be Well Capitalized Under Prompt Corrective Action Regulations, Amount	$ 162,822	$ 163,393
To Be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	6.50%	6.50%
Tier 1 leverage capital:
Actual, Amount	$ 299,141	$ 292,160
Actual, Ratio	0.096	0.095
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Amount	$ 124,550	$ 122,907
For Capital Adequacy Purposes (includes applicable capital conservation buffer), Ratio	0.040	0.040
To Be Well Capitalized Under Prompt Corrective Action Regulations, Amount	$ 155,687	$ 153,634
To Be Well Capitalized Under Prompt Corrective Action Regulations, Ratio	0.050	0.050