LOAN PERFORMANCE - Outstanding Troubled debt restructurings and other loans individually evaluated (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)
Restructured loans
Accruing TDR	$ 8,441,000	$ 33,781,000
Non-Accrual TDR	393,000	1,019,000
Total TDR	8,834,000	34,800,000
Other Non-Accrual	584,000	10,149,000
Other Accruing	3,499,000	2,458,000
Total Individually Evaluated	12,917,000	47,407,000
Commitment to fund on loans that were previously restructured	$ 2,000,000.0	2,700,000
Loans modified as a troubled debt restructured loan	0
Commercial and industrial
Restructured loans
Accruing TDR	$ 397,000	3,147,000
Non-Accrual TDR	282,000	404,000
Total TDR	679,000	3,551,000
Other Non-Accrual	314,000	5,115,000
Other Accruing	6,000	748,000
Total Individually Evaluated	999,000	9,414,000
Commercial real estate
Restructured loans
Accruing TDR	1,337,000	10,631,000
Total TDR	1,337,000	10,631,000
Other Non-Accrual	67,000	4,811,000
Total Individually Evaluated	1,404,000	15,442,000
Construction and development
Restructured loans
Accruing TDR		12,032,000
Non-Accrual TDR		506,000
Total TDR		12,538,000
Total Individually Evaluated		12,538,000
1-4 family residential
Restructured loans
Accruing TDR	54,000	1,699,000
Non-Accrual TDR	111,000	109,000
Total TDR	165,000	1,808,000
Other Non-Accrual	203,000	223,000
Other Accruing	3,283,000	1,710,000
Total Individually Evaluated	3,651,000	3,741,000
Other
Restructured loans
Accruing TDR	6,653,000	6,272,000
Total TDR	6,653,000	6,272,000
Total Individually Evaluated	6,653,000	$ 6,272,000
Consumer
Restructured loans
Other Accruing	210,000
Total Individually Evaluated	$ 210,000