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BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
BASIS OF PRESENTATION
Allowance for credit losses	$ 43,474	$ 43,401		$ 32,786	$ 32,173	$ 31,171	$ 31,418
Retained earnings	167,899			150,703
Adjustment to retained earnings	167,899			150,703
ASU 2016-13 \| Effect of adoption
BASIS OF PRESENTATION
Allowance for credit losses			$ 1,600	$ 1,625
Reserve for unfunded commitments			500
Retained earnings	1,500		0
Adjustment to retained earnings	$ 1,500		$ 0