LOANS - Troubled debt restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Integer	Dec. 31, 2018 USD ($) Integer
Business Activities Loans - Residential real estate
Quantity of troubled debt restructurings | Integer	3	1
Pre-modification balance	$ 1,416	$ 68
Post-modification balance	$ 1,416	$ 68
Business Activities Loans - Commercial real estate
Quantity of troubled debt restructurings | Integer	4	1
Pre-modification balance	$ 977	$ 566
Post-modification balance	$ 1,191	$ 566
Business Activities Loans - Consumer
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance
Post-modification balance	$ 36
Business Activities Loans - Troubled debt restructurings, total
Quantity of troubled debt restructurings | Integer	8	2
Pre-modification balance	$ 2,393	$ 634
Post-modification balance	$ 2,643	$ 634
Business Activities Loans - Interest only payments to sell property
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance	$ 791
Post-modification balance	$ 791
Business Activities Loans - Rate reduction
Quantity of troubled debt restructurings | Integer		2
Pre-modification balance		$ 634
Post-modification balance		$ 634
Business Activities Loans - Modification and Rate reduction
Quantity of troubled debt restructurings | Integer	2
Pre-modification balance	$ 625
Post-modification balance	$ 625
Business Activities Loans - Extension of new funds to pay outstanding taxes
Quantity of troubled debt restructurings | Integer	3
Pre-modification balance	$ 259
Post-modification balance	$ 442
Business Activities Loans - Modification and term extension
Quantity of troubled debt restructurings | Integer	2
Pre-modification balance	$ 718
Post-modification balance	$ 785