LOANS - Contractual Aging of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
LOANS
Loans current and past due less than 30 days	$ 1,675,372	$ 1,166,748
Loans receivable	1,691,370	1,182,222
Past Due 30-89 Days
LOANS
Loans past due	4,727	10,023
Past Due 90+ Days
LOANS
Loans past due	11,271	5,451
Residential mortgage
LOANS
Loans current and past due less than 30 days	630,329	573,938
Loans receivable	639,023	586,580
Residential mortgage \| Past Due 30-89 Days
LOANS
Loans past due	3,525	8,414
Residential mortgage \| Past Due 90+ Days
LOANS
Loans past due	5,169	4,228
Residential mortgage \| Real estate loan \| first liens
LOANS
Loans current and past due less than 30 days	534,303	499,024
Loans receivable	541,827	510,641
Residential mortgage \| Real estate loan \| first liens \| Past Due 30-89 Days
LOANS
Loans past due	2,819	7,839
Residential mortgage \| Real estate loan \| first liens \| Past Due 90+ Days
LOANS
Loans past due	4,705	3,778
Residential mortgage \| Real estate loan \| junior liens
LOANS
Loans current and past due less than 30 days	27,660	27,041
Loans receivable	27,907	27,503
Residential mortgage \| Real estate loan \| junior liens \| Past Due 30-89 Days
LOANS
Loans past due	44	83
Residential mortgage \| Real estate loan \| junior liens \| Past Due 90+ Days
LOANS
Loans past due	203	379
Residential mortgage \| Home equity lines of credit
LOANS
Loans current and past due less than 30 days	39,737	33,115
Loans receivable	40,143	33,638
Residential mortgage \| Home equity lines of credit \| Past Due 30-89 Days
LOANS
Loans past due	145	452
Residential mortgage \| Home equity lines of credit \| Past Due 90+ Days
LOANS
Loans past due	261	71
Residential mortgage \| Construction Loans
LOANS
Loans current and past due less than 30 days	28,629	14,758
Loans receivable	29,146	14,798
Residential mortgage \| Construction Loans \| Past Due 30-89 Days
LOANS
Loans past due	517	40
Residential mortgage \| Construction Loans \| Past Due 90+ Days
LOANS
Loans past due	0	0
Commercial
LOANS
Loans current and past due less than 30 days	1,027,966	576,314
Loans receivable	1,035,071	578,901
Commercial \| Past Due 30-89 Days
LOANS
Loans past due	1,115	1,420
Commercial \| Past Due 90+ Days
LOANS
Loans past due	5,990	1,167
Commercial \| Real estate loan
LOANS
Loans current and past due less than 30 days	525,211	299,640
Loans receivable	530,874	301,227
Commercial \| Real estate loan \| Past Due 30-89 Days
LOANS
Loans past due	867	737
Commercial \| Real estate loan \| Past Due 90+ Days
LOANS
Loans past due	4,796	850
Commercial \| Construction Loans
LOANS
Loans current and past due less than 30 days	41,857	33,505
Loans receivable	41,906	33,555
Commercial \| Construction Loans \| Past Due 30-89 Days
LOANS
Loans past due	49	0
Commercial \| Construction Loans \| Past Due 90+ Days
LOANS
Loans past due	0	50
Commercial \| Commercial and industrial
LOANS
Loans current and past due less than 30 days	155,140	126,221
Loans receivable	156,169	126,374
Commercial \| Commercial and industrial \| Past Due 30-89 Days
LOANS
Loans past due	57	16
Commercial \| Commercial and industrial \| Past Due 90+ Days
LOANS
Loans past due	972	137
Commercial \| Small Business Administration - Paycheck Protection Program
LOANS
Loans current and past due less than 30 days	163,050	0
Loans receivable	163,050	0
Commercial \| Small Business Administration - Paycheck Protection Program \| Past Due 30-89 Days
LOANS
Loans past due	0	0
Commercial \| Small Business Administration - Paycheck Protection Program \| Past Due 90+ Days
LOANS
Loans past due	0	0
Commercial \| Political subdivisions
LOANS
Loans current and past due less than 30 days	47,883	53,570
Loans receivable	47,883	53,570
Commercial \| Political subdivisions \| Past Due 30-89 Days
LOANS
Loans past due	0	0
Commercial \| Political subdivisions \| Past Due 90+ Days
LOANS
Loans past due	0	0
Commercial \| Loans secured by farm land
LOANS
Loans current and past due less than 30 days	11,654	11,455
Loans receivable	11,913	12,251
Commercial \| Loans secured by farm land \| Past Due 30-89 Days
LOANS
Loans past due	37	666
Commercial \| Loans secured by farm land \| Past Due 90+ Days
LOANS
Loans past due	222	130
Commercial \| Multi-family (5 or more) residential
LOANS
Loans current and past due less than 30 days	62,330	31,070
Loans receivable	62,330	31,070
Commercial \| Multi-family (5 or more) residential \| Past Due 30-89 Days
LOANS
Loans past due	0	0
Commercial \| Multi-family (5 or more) residential \| Past Due 90+ Days
LOANS
Loans past due	0	0
Commercial \| Agricultural loans
LOANS
Loans current and past due less than 30 days	3,456	4,318
Loans receivable	3,561	4,319
Commercial \| Agricultural loans \| Past Due 30-89 Days
LOANS
Loans past due	105	1
Commercial \| Agricultural loans \| Past Due 90+ Days
LOANS
Loans past due	0	0
Commercial \| Other commercial loans
LOANS
Loans current and past due less than 30 days	17,385	16,535
Loans receivable	17,385	16,535
Commercial \| Other commercial loans \| Past Due 30-89 Days
LOANS
Loans past due	0	0
Commercial \| Other commercial loans \| Past Due 90+ Days
LOANS
Loans past due	0	0
Consumer
LOANS
Loans current and past due less than 30 days	17,077	16,496
Loans receivable	17,276	16,741
Consumer \| Past Due 30-89 Days
LOANS
Loans past due	87	189
Consumer \| Past Due 90+ Days
LOANS
Loans past due	$ 112	$ 56