LOANS - Troubled debt restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) Integer	Mar. 31, 2019 USD ($) Integer
Residential real estate
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Commercial real estate
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance	$ 133
Post-modification balance	$ 133
Consumer
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Troubled debt restructurings
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance	$ 133
Post-modification balance	$ 133
Interest only payments to sell property
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Rate reduction
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Modification and Rate reduction
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Workout refinance. Extension of new funds to pay outstanding taxes
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance	$ 133
Post-modification balance	$ 133
Modification and term extension
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance