LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - NON-PERFORMING LOANS (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Non-performing loans and non-performing assets disclosures
Loans on nonaccrual status	$ 15,475	$ 15,892
Loans past due 90 days or more and still on accrual	906	167
Total nonperforming loans	16,381	16,059
Other real estate owned	167	1,391
Total nonperforming assets	$ 16,548	$ 17,450
Credit Quality Ratios - Total Company:
Nonperforming loans to total loans (as percent)	0.41%	0.42%
Nonperforming assets to total loans (including OREO) (as percent)	0.42%	0.46%
Nonperforming assets to total assets (as percent)	0.33%	0.36%
Core Banking Activities
Non-performing loans and non-performing assets disclosures
Loans on nonaccrual status	$ 15,475	$ 15,892
Loans past due 90 days or more and still on accrual	$ 55	$ 85
Credit Quality Ratios - Total Company:
Nonperforming loans to total loans (as percent)	0.40%	0.42%
Nonperforming assets to total loans (including OREO) (as percent)	0.40%	0.46%
Nonperforming assets to total assets (as percent)	0.32%	0.36%