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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 26 Months Ended
Jul. 25, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Apr. 19, 2021
Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items]                          
Off-balance-sheet, credit risk exposure liability   $ 1,700   $ 1,700   $ 1,700     $ 1,633        
Allowance for credit loss impact of adoption   $ 28,383   $ 28,383   $ 28,383 $ 28,364   25,178        
Reserves under Incurred Loss Model     $ 23,279   $ 23,279       25,178 $ 21,508 $ 21,180    
Number of shares reserved to be issued (in shares)   1,045,000   1,045,000   1,045,000              
Number of shares available to be issued under employee stock purchase plan (in shares)   665,000   665,000   665,000              
Number of shares authorized to be repurchased (in shares)                       978,000 416,000
Stock repurchase program, additional number of shares authorized to be repurchased                       562,000  
Treasury stock, shares acquired (in shares)   65,830 392,324 38,826 485,762 949,533              
Acquisition of treasury stock           $ 21,200              
Acquisition of treasury stock (in usd per share)   $ 18.40       $ 22.36              
Stock repurchase program, shares available for future repurchase   28,467   28,467   28,467              
Stock repurchase program percentage of outstanding shares of common stock available for future purchase   0.30%   0.30%   0.30%              
Common Stock                          
Equity, Class of Treasury Stock [Line Items]                          
Treasury stock, shares acquired (in shares)   76,330                      
Orrstown 2011 Incentive Stock Plan                          
Equity, Class of Treasury Stock [Line Items]                          
Number of shares reserved to be issued (in shares)   1,281,920   1,281,920   1,281,920              
Number of shares available to be issued under employee stock purchase plan (in shares)   420,758   420,758   420,758              
Subsequent Event                          
Equity, Class of Treasury Stock [Line Items]                          
Dividends declared per share (in usd per share) $ 0.20                        
Cumulative Effect, Period of Adoption, Adjustment                          
Equity, Class of Treasury Stock [Line Items]                          
Off-balance-sheet, credit risk exposure liability               $ 100          
Allowance for credit loss impact of adoption               2,423 $ 2,423        
Allowance for credit losses on loans and off-balance sheet credit risk liability               $ 2,500