ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Troubled Debt Restructuring (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY
Accruing troubled debt restructured loans	$ 5,040
Nonaccrual troubled debt restructured loans	5,938
Total troubled debt restructured loans	$ 10,978
Accruing troubled debt restructured loans		$ 5,237
Nonaccrual troubled debt restructured loans		6,476
Total troubled debt restructured loans		$ 11,713