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LOAN LOSS ALLOWANCE - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
grade
Credit quality information  
Allowance for losses on acquired loans under Subtopic ASC 310-30 | $ $ 6.7
Acquired Loans  
Credit quality information  
Number of grades in internal loan rating system (grade) 11
Residential mortgages | Business Activities Loans  
Credit quality information  
Number of grades in internal loan rating system (grade) 3
Residential mortgages | Business Activities Loans | Pass | Maximum  
Credit quality information  
Delinquency period of loans based on which risk rating is assigned to loans (in days) 59 days
Residential mortgages | Business Activities Loans | Special mention | Minimum  
Credit quality information  
Delinquency period of loans based on which risk rating is assigned to loans (in days) 60 days
Residential mortgages | Business Activities Loans | Special mention | Maximum  
Credit quality information  
Delinquency period of loans based on which risk rating is assigned to loans (in days) 89 days
Residential mortgages | Business Activities Loans | Substandard | Minimum  
Credit quality information  
Delinquency period of loans based on which risk rating is assigned to loans (in days) 90 days
Consumer | Business Activities Loans | Other  
Credit quality information  
Number of grades in internal loan rating system (grade) 2
Consumer | Business Activities Loans | Performing | Maximum | Other  
Credit quality information  
Period within which loans are current, based on which risk rating is assigned (in days) 119 days
Consumer | Business Activities Loans | Nonperforming | Minimum | Other  
Credit quality information  
Delinquency period of loans based on which risk rating is assigned to loans (in days) 120 days