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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenue $ 6,481 $ 4,922
Trust management fees    
Disaggregation of Revenue [Line Items]    
Revenue 3,046 2,525
Financial services fees    
Disaggregation of Revenue [Line Items]    
Revenue 323 233
Interchange fees    
Disaggregation of Revenue [Line Items]    
Revenue 1,738 1,031
Customer deposit fees    
Disaggregation of Revenue [Line Items]    
Revenue 1,110 907
Other customer service fees    
Disaggregation of Revenue [Line Items]    
Revenue $ 264 $ 226