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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenue $ 24,705 $ 22,190
Products and services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 11,992 10,748
Products and services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 12,713 11,442
Trust management fees    
Disaggregation of Revenue [Line Items]    
Revenue 12,246 11,098
Financial services fees    
Disaggregation of Revenue [Line Items]    
Revenue 1,132 966
Interchange fees    
Disaggregation of Revenue [Line Items]    
Revenue 6,668 4,899
Customer deposit fees    
Disaggregation of Revenue [Line Items]    
Revenue 3,746 4,281
Other customer service fees    
Disaggregation of Revenue [Line Items]    
Revenue $ 913 $ 946