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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
9 Months Ended
Aug. 19, 2021
Aug. 12, 2021
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]        
Reserve balances, Federal Reserve Bank     $ 0 $ 0
IPO        
Finite-Lived Intangible Assets [Line Items]        
Number of shares sold (in shares)   996,429    
Sale of stock (in dollars per share)   $ 19.00    
Over-Allotment Option        
Finite-Lived Intangible Assets [Line Items]        
Number of shares sold (in shares) 300,000      
Core Deposits        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, remaining amortization period     7 years  
Minimum | Buildings        
Finite-Lived Intangible Assets [Line Items]        
Premises and equipment, estimated useful life     10 years  
Minimum | Furniture and equipment        
Finite-Lived Intangible Assets [Line Items]        
Premises and equipment, estimated useful life     3 years  
Maximum | Buildings        
Finite-Lived Intangible Assets [Line Items]        
Premises and equipment, estimated useful life     39 years  
Maximum | Furniture and equipment        
Finite-Lived Intangible Assets [Line Items]        
Premises and equipment, estimated useful life     7 years