ALLOWANCE FOR LOAN LOSSES - ACL for loans by loan class (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Loan Category
Allowance for credit losses on loans	$ 39,678	$ 25,280	$ 25,342	$ 23,693
Allowance for loan losses (as a percent)	100.00%	100.00%
Commercial and industrial
Loan Category
Allowance for credit losses on loans	$ 12,108	$ 7,671	7,792	7,719
Allowance for loan losses (as a percent)	30.50%	30.30%
Commercial real estate
Loan Category
Allowance for credit losses on loans	$ 12,424	$ 7,975	7,371	6,730
Allowance for loan losses (as a percent)	31.30%	31.60%
Construction and development
Loan Category
Allowance for credit losses on loans	$ 7,050	$ 4,446	4,579	4,298
Allowance for loan losses (as a percent)	17.80%	17.60%
1-4 family residential
Loan Category
Allowance for credit losses on loans	$ 3,173	$ 2,257	2,236	2,281
Allowance for loan losses (as a percent)	8.00%	8.90%
Multifamily residential
Loan Category
Allowance for credit losses on loans	$ 2,880	$ 1,699	2,178	1,511
Allowance for loan losses (as a percent)	7.30%	6.70%
Consumer
Loan Category
Allowance for credit losses on loans	$ 529	$ 388	458	387
Allowance for loan losses (as a percent)	1.30%	1.50%
Agriculture
Loan Category
Allowance for credit losses on loans	$ 134	$ 74	73	62
Allowance for loan losses (as a percent)	0.30%	0.30%
Other
Loan Category
Allowance for credit losses on loans	$ 1,380	$ 770	$ 655	$ 705
Allowance for loan losses (as a percent)	3.50%	3.10%