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BANK PREMISES AND EQUIPMENT - Depreciation Expense (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
BANK PREMISES AND EQUIPMENT      
Total depreciation expense $ 3,074,000 $ 2,941,000 $ 2,709,000
Number of branches closed or consolidated | item 6    
Bank premises held for sale total $ 1,452,000 121,000  
Impairment losses on bank premises held for sale 661,000 0 37,000
Building and improvements      
BANK PREMISES AND EQUIPMENT      
Total depreciation expense 1,694,000 1,761,000 1,813,000
Furniture, fixtures, and equipment      
BANK PREMISES AND EQUIPMENT      
Total depreciation expense $ 1,380,000 $ 1,180,000 $ 896,000