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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
security
$ / shares
Dec. 31, 2023
USD ($)
location
lease
item
security
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Jan. 01, 2023
USD ($)
Dec. 31, 2020
USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Number of Stores 17 17        
Number of locations in Southwestern Pennsylvania Counties | item   5        
Assets under Management, Carrying Amount $ 2,500,000,000 $ 2,500,000,000 $ 2,300,000,000      
Number of locations in Pennsylvania | location   16        
Number of locations in state Maryland | location   1        
Held to maturity, allowance for credit losses 37,000 $ 37,000     $ 114,000  
Accrued interest receivable on held to maturity debt securities 388,000 388,000        
Held to maturity debt securities in non-accrual 0 0        
Allowance for credit losses 926,000 926,000        
Accrued interest receivable on available for sale debt securities $ 988,000 $ 988,000        
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest income receivable Accrued interest income receivable        
Number of available for sale debt securities in non accrual status | security 1 1        
Available-for-Sale debt securities in non-accrual $ 926,000 $ 926,000        
Federal Home Loan Bank Stock Par Value | $ / shares $ 100 $ 100        
Accrued interest receivable $ 4,200,000 $ 4,200,000 $ 3,500,000      
Threshold Period Past Due for Write-off of Financing Receivable 90 days 90 days        
Description Of Accounting Treatment For Short Term Operating Lease   As of December 31, 2023, the Company had no short-term leases compared to one short-term lease for an office location as of December 31, 2022.        
Percentage of general reserve 49.00%          
Percentage of quantitative reserve 51.00%          
Evaluated for impairment $ 150,000 $ 150,000        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   218,000 22,000 22,000    
Income Taxes Paid   $ 625,000,000,000 $ 1,100,000 $ 200,000    
Real Estate Owned, Transfer from Real Estate Owned   15,000 53,000 8,000    
Operating lease liabilities 658,000 658,000 643,000      
Operating lease right-of-use asset 646,000 646,000 630,000      
Finance Lease, Right-of-Use Asset 2,384,000 2,384,000 2,413,000      
Finance Lease, Liability 2,700,000 2,700,000 2,680,000      
Total interest payments   21,771,000 8,450,000 8,049,000    
Allowance for credit losses - Loans 15,053,000 15,053,000 10,743,000 $ 12,398,000 11,947,000 $ 11,345,000
Allowance for credit losses 940,000 940,000 $ 746,000   923,000  
Consumer and residential mortgage loans            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Minimum aggregate balances for commercial loan relationship under structure loan rating process. $ 250,000 $ 250,000        
Core Deposits Intangibles            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Finite-lived intangible asset useful life 10 years 10 years        
Minimum            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Price Of Anti Dilutive Option Amount | $ / shares $ 3.18 $ 3.18 $ 4.00 $ 4.00    
Maximum            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Price Of Anti Dilutive Option Amount | $ / shares $ 4.22 $ 4.22 $ 4.22 $ 4.22    
Impact of adopting ASU 2016-13            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Held to maturity, allowance for credit losses     $ 114,000      
ASU 2016-13            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Held to maturity, allowance for credit losses $ 114,000 $ 114,000        
Allowance for credit losses - Loans 1,200,000 1,200,000     1,200,000  
Allowance for credit losses         177,000  
ASU 2016-13 | Unfunded Loan Commitment            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Held to maturity, allowance for credit losses         114,000  
Allowance for credit losses 177,000 177,000        
ASU 2016-13 | Revision of Prior Period, Adjustment            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Held to maturity, allowance for credit losses         114,000  
Allowance for credit losses - Loans         1,204,000  
Allowance for credit losses         $ 177,000  
ASU 2016-13 | Impact of adopting ASU 2016-13            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Allowance for credit losses - Loans (1,204,000) (1,204,000)        
U.S. Agency            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Held to maturity, allowance for credit losses 0 0        
U.S. Agency mortgage-backed securities            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Held to maturity, allowance for credit losses 0 0        
Commercial | Commercial            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Minimum aggregate balances for commercial loan relationship under structure loan rating process. $ 1,000,000 $ 1,000,000        
Premises            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Property, Plant and Equipment, Useful Life 30 years 30 years        
Equipment            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Property, Plant and Equipment, Useful Life 10 years 10 years        
New Finance Leased Assets            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Number of financing leases | lease   2        
Finance Lease, Right-of-Use Asset     45,000      
Finance Lease, Liability $ 248,000 $ 248,000 $ 45,000      
Operating lease relating to office location            
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES            
Operating lease liabilities 85,000 85,000        
Operating lease right-of-use asset $ 85,000 $ 85,000