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NON-INTEREST INCOME - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Disaggregation of Revenue [Line Items]    
Revenue $ 5,442 $ 16,097
Trust management fees    
Disaggregation of Revenue [Line Items]    
Revenue 2,720 8,268
Financial services fees    
Disaggregation of Revenue [Line Items]    
Revenue 232 768
Interchange fees    
Disaggregation of Revenue [Line Items]    
Revenue 1,146 3,277
Customer deposit fees    
Disaggregation of Revenue [Line Items]    
Revenue 1,095 3,093
Other customer service fees    
Disaggregation of Revenue [Line Items]    
Revenue $ 249 $ 691