LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan delinquencies (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans past due
Current	$ 1,850,467	$ 1,598,994
Total Accruing Past Due	7,247	21,147
Non-accrual	9,071	10,203
Total Financing Receivables	1,866,785	1,630,344
30-89 Days
Loans past due
Total Accruing Past Due	7,247	21,147
Construction and development
Loans past due
Current	52,087	45,497
Total Financing Receivables	52,087	45,497
Commercial real estate
Loans past due
Current	469,143	472,707
Non-accrual	2,173	2,860
Total Financing Receivables	471,316	475,567
Commercial and industrial
Loans past due
Current	162,449	134,463
Total Accruing Past Due		155
Non-accrual	95	34
Total Financing Receivables	162,544	134,652
Commercial and industrial | 30-89 Days
Loans past due
Total Accruing Past Due		155
Residential real estate
Loans past due
Current	1,166,619	946,144
Total Accruing Past Due	7,247	20,992
Non-accrual	6,803	7,309
Total Financing Receivables	1,180,669	974,445
Residential real estate | 30-89 Days
Loans past due
Total Accruing Past Due	7,247	20,992
Consumer and Other
Loans past due
Current	169	183
Total Financing Receivables	$ 169	$ 183