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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue $ 28,391 $ 24,705
Products and services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 14,250 11,992
Products and services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 14,141 12,713
Trust management fees    
Disaggregation of Revenue [Line Items]    
Revenue 13,495 12,246
Financial services fees    
Disaggregation of Revenue [Line Items]    
Revenue 1,684 1,132
Interchange fees    
Disaggregation of Revenue [Line Items]    
Revenue 7,368 6,668
Customer deposit fees    
Disaggregation of Revenue [Line Items]    
Revenue 4,905 3,746
Other customer service fees    
Disaggregation of Revenue [Line Items]    
Revenue $ 939 $ 913