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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue $ 6,418 $ 5,566 $ 18,497 $ 16,172
Products and services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 3,133 2,839 9,026 7,874
Products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 3,285 2,727 9,471 8,298
Trust management fees        
Disaggregation of Revenue [Line Items]        
Revenue 3,256 2,737 9,194 8,055
Financial services fees        
Disaggregation of Revenue [Line Items]        
Revenue 276 276 867 781
Interchange fees        
Disaggregation of Revenue [Line Items]        
Revenue 1,709 1,323 4,910 3,567
Customer deposit fees        
Disaggregation of Revenue [Line Items]        
Revenue 937 1,112 2,836 3,046
Other customer service fees        
Disaggregation of Revenue [Line Items]        
Revenue $ 240 $ 118 $ 691 $ 723