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FAIR VALUE - Narrative (Detail)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value option, aggregate fair value exceeded principal amount $ 150,000 $ 436,000  
OREO balances 0 0  
Valuation allowance for impairment of assets 79,000 1,100,000  
Mortgage servicing rights impairment (987,000) 997,000  
Impaired loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Changes in fair value of impaired loans and foreclosed real estate (247,000) $ 244,000 $ 77,000
Interest rate lock commitments with customers      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Increase (decrease) in fair value $ 19,000    
Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Mortgage loans originated for sale     $ 226,000
Level 3 | Measurement Input, Pull Through | Interest rate lock commitments with customers      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Asset, measurement input (percent) 0.89    
Level 3 | Measurement Input, Pull Through Increase (Decrease) | Interest rate lock commitments with customers      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Asset, measurement input (percent) 0.05