LOANS - Risk rating (Details)	3 Months Ended
	Mar. 31, 2020 region
Risk category
Number of main regions	4
Commercial Portfolio | Credit Risk State One [Member]
Risk category
Credit Risk Rating Number for Commercial Loan	0-5
Commercial Portfolio | Credit Risk State Two [Member]
Risk category
Credit Risk Rating Number for Commercial Loan	6
Commercial Portfolio | Credit Risk State Three [Member]
Risk category
Credit Risk Rating Number for Commercial Loan	7
Commercial Portfolio | Credit Risk State Four [Member]
Risk category
Credit Risk Rating Number for Commercial Loan	8
Commercial Portfolio | Credit Risk State Default [Member]
Risk category
Credit Risk Rating Number for Commercial Loan	9+ and nonaccrual
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State One [Member] | Minimum
Risk category
Threshold period past due for loans	0 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State One [Member] | Maximum
Risk category
Threshold period past due for loans	14 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State Two [Member] | Minimum
Risk category
Threshold period past due for loans	15 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State Two [Member] | Maximum
Risk category
Threshold period past due for loans	29 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State Three [Member] | Minimum
Risk category
Threshold period past due for loans	30 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State Three [Member] | Maximum
Risk category
Threshold period past due for loans	59 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State Four [Member] | Minimum
Risk category
Threshold period past due for loans	60 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State Four [Member] | Maximum
Risk category
Threshold period past due for loans	89 days
Consumer Loans and Equipment Finance Loans and Leases | Credit Risk State Default [Member] | Minimum
Risk category
Threshold period past due for loans	90 days