LOANS - Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans by risk rating
Total loans	$ 3,165,733	$ 2,980,252
Commercial real estate
Loans by risk rating
Total loans	1,172,351	934,420
Commercial real estate | Loans rated 1 - 6, pass
Loans by risk rating
Total loans	1,165,770	919,305
Commercial real estate | Loans rated 7, special mention
Loans by risk rating
Total loans	4,539	10,595
Commercial real estate | Loans rated 8, substandard
Loans by risk rating
Total loans	530	2,502
Commercial real estate | Loans not rated
Loans by risk rating
Total loans	1,512	2,018
Commercial
Loans by risk rating
Total loans	306,282	277,271
Commercial | Loans rated 1 - 6, pass
Loans by risk rating
Total loans	294,507	268,280
Commercial | Loans rated 7, special mention
Loans by risk rating
Total loans	6,117	5,165
Commercial | Loans rated 8, substandard
Loans by risk rating
Total loans	3,223	1,896
Commercial | Loans rated 9, doubtful
Loans by risk rating
Total loans	2,435	1,930
Commercial Construction
Loans by risk rating
Total loans	153,907	161,660
Commercial Construction | Loans rated 1 - 6, pass
Loans by risk rating
Total loans	127,962	147,124
Commercial Construction | Loans rated 7, special mention
Loans by risk rating
Total loans	14,701	$ 14,536
Commercial Construction | Loans rated 8, substandard
Loans by risk rating
Total loans	$ 11,244