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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 23 Months Ended
May 08, 2023
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Jan. 01, 2023
Dec. 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   $ 1,633      
Allowance for credit loss impact of adoption   $ 28,364   $ 28,364   25,178      
Reserves under Incurred Loss Model     $ 21,508     25,178 $ 21,180    
Number of shares reserved to be issued (in shares)   1,045,000   1,045,000          
Number of shares available to be issued under employee stock purchase plan (in shares)   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)   27,004 93,438 873,203          
Acquisition of treasury stock       $ 19,800          
Acquisition of treasury stock (in usd per share)   $ 21.65   $ 22.71          
Stock repurchase program, shares available for future repurchase   104,797   104,797          
Stock repurchase program percentage of outstanding shares of common stock available for future purchase   1.00%   1.00%          
Common Stock                  
Equity, Class of Treasury Stock [Line Items]                  
Treasury stock, shares acquired (in shares)   54,262              
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          
Number of shares available to be issued under employee stock purchase plan (in shares)   413,800   413,800          
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