LOANS AND ALLOWANCE FOR CREDIT LOSSES - NON-PERFORMING LOANS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Non-performing loans and non-performing assets disclosures
Loans on nonaccrual status	$ 23,548	$ 23,332
Loans past due 90 days or more and still on accrual	47	157
Total nonperforming loans	23,595	23,489
Other real estate owned	2,499	113
Total nonperforming assets	$ 26,094	$ 23,602
Credit Quality Ratios - Total Company:
Nonperforming loans to total loans (as percent)	0.49%	0.53%
Nonperforming assets to total loans (including OREO) (as percent)	0.54%	0.53%
Nonperforming assets to total assets (as percent)	0.42%	0.42%
Core Banking
Non-performing loans and non-performing assets disclosures
Loans on nonaccrual status	$ 23,548	$ 23,332
Loans past due 90 days or more and still on accrual	$ 5
Credit Quality Ratios - Total Company:
Nonperforming loans to total loans (as percent)	0.50%	0.54%
Nonperforming assets to total loans (including OREO) (as percent)	0.56%	0.54%
Nonperforming assets to total assets (as percent)	0.45%	0.43%