LOANS - Contractual Aging of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loans current and past due less than 30 days	$ 1,225,235	$ 1,166,748
Loans receivable	1,241,413	1,182,222
Past Due 30-89 Days
Loans past due	6,391	10,023
Past Due 90+ Days
Loans past due	9,787	5,451
Residential mortgage
Loans current and past due less than 30 days	556,478	573,938
Loans receivable	566,293	586,580
Residential mortgage \| Past Due 30-89 Days
Loans past due	5,452	8,414
Residential mortgage \| Past Due 90+ Days
Loans past due	4,363	4,228
Residential mortgage \| Real estate loan \| first liens
Loans current and past due less than 30 days	484,129	499,024
Loans receivable	493,214	510,641
Residential mortgage \| Real estate loan \| first liens \| Past Due 30-89 Days
Loans past due	5,111	7,839
Residential mortgage \| Real estate loan \| first liens \| Past Due 90+ Days
Loans past due	3,974	3,778
Residential mortgage \| Real estate loan \| junior liens
Loans current and past due less than 30 days	25,482	27,041
Loans receivable	25,632	27,503
Residential mortgage \| Real estate loan \| junior liens \| Past Due 30-89 Days
Loans past due	4	83
Residential mortgage \| Real estate loan \| junior liens \| Past Due 90+ Days
Loans past due	146	379
Residential mortgage \| Home equity lines of credit
Loans current and past due less than 30 days	31,246	33,115
Loans receivable	31,826	33,638
Residential mortgage \| Home equity lines of credit \| Past Due 30-89 Days
Loans past due	337	452
Residential mortgage \| Home equity lines of credit \| Past Due 90+ Days
Loans past due	243	71
Residential mortgage \| Construction Loans
Loans current and past due less than 30 days	15,621	14,758
Loans receivable	15,621	14,798
Residential mortgage \| Construction Loans \| Past Due 30-89 Days
Loans past due	0	40
Residential mortgage \| Construction Loans \| Past Due 90+ Days
Loans past due	0	0
Commercial
Loans current and past due less than 30 days	652,552	576,314
Loans receivable	658,676	578,901
Commercial \| Past Due 30-89 Days
Loans past due	815	1,420
Commercial \| Past Due 90+ Days
Loans past due	5,309	1,167
Commercial \| Real estate loan
Loans current and past due less than 30 days	291,728	299,640
Loans receivable	293,304	301,227
Commercial \| Real estate loan \| Past Due 30-89 Days
Loans past due	245	737
Commercial \| Real estate loan \| Past Due 90+ Days
Loans past due	1,331	850
Commercial \| Construction Loans
Loans current and past due less than 30 days	39,947	33,505
Loans receivable	40,348	33,555
Commercial \| Construction Loans \| Past Due 30-89 Days
Loans past due	351	0
Commercial \| Construction Loans \| Past Due 90+ Days
Loans past due	50	50
Commercial \| Commercial and industrial
Loans current and past due less than 30 days	116,429	126,221
Loans receivable	120,202	126,374
Commercial \| Commercial and industrial \| Past Due 30-89 Days
Loans past due	67	16
Commercial \| Commercial and industrial \| Past Due 90+ Days
Loans past due	3,706	137
Commercial \| Small Business Administration - Paycheck Protection Program
Loans current and past due less than 30 days	97,103	0
Loans receivable	97,103	0
Commercial \| Small Business Administration - Paycheck Protection Program \| Past Due 30-89 Days
Loans past due	0	0
Commercial \| Small Business Administration - Paycheck Protection Program \| Past Due 90+ Days
Loans past due	0	0
Commercial \| Political subdivisions
Loans current and past due less than 30 days	43,134	53,570
Loans receivable	43,134	53,570
Commercial \| Political subdivisions \| Past Due 30-89 Days
Loans past due	0	0
Commercial \| Political subdivisions \| Past Due 90+ Days
Loans past due	0	0
Commercial \| Loans secured by farm land
Loans current and past due less than 30 days	11,159	11,455
Loans receivable	11,433	12,251
Commercial \| Loans secured by farm land \| Past Due 30-89 Days
Loans past due	52	666
Commercial \| Loans secured by farm land \| Past Due 90+ Days
Loans past due	222	130
Commercial \| Multi-family (5 or more) residential
Loans current and past due less than 30 days	32,699	31,070
Loans receivable	32,699	31,070
Commercial \| Multi-family (5 or more) residential \| Past Due 30-89 Days
Loans past due	0	0
Commercial \| Multi-family (5 or more) residential \| Past Due 90+ Days
Loans past due	0	0
Commercial \| Agricultural loans
Loans current and past due less than 30 days	3,800	4,318
Loans receivable	3,874	4,319
Commercial \| Agricultural loans \| Past Due 30-89 Days
Loans past due	74	1
Commercial \| Agricultural loans \| Past Due 90+ Days
Loans past due	0	0
Commercial \| Other commercial loans
Loans current and past due less than 30 days	16,553	16,535
Loans receivable	16,579	16,535
Commercial \| Other commercial loans \| Past Due 30-89 Days
Loans past due	26	0
Commercial \| Other commercial loans \| Past Due 90+ Days
Loans past due	0	0
Consumer
Loans current and past due less than 30 days	16,205	16,496
Loans receivable	16,444	16,741
Consumer \| Past Due 30-89 Days
Loans past due	124	189
Consumer \| Past Due 90+ Days
Loans past due	$ 115	$ 56