LOANS - Troubled debt restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) Integer	Jun. 30, 2019 USD ($) Integer	Jun. 30, 2020 USD ($) Integer	Jun. 30, 2019 USD ($) Integer
Residential real estate
Quantity of troubled debt restructurings | Integer		2		2
Pre-modification balance		$ 623		$ 623
Post-modification balance		$ 623		$ 623
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	1	1		1
Pre-modification balance		$ 42		$ 42
Post-modification balance		$ 42		$ 42
Troubled debt restructurings
Quantity of troubled debt restructurings | Integer		3	1	3
Pre-modification balance		$ 665	$ 133	$ 665
Post-modification balance		$ 665	$ 133	$ 665
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		3		3
Pre-modification balance		$ 665		$ 665
Post-modification balance		$ 665		$ 665
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