LOANS - Contractual Aging of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
LOANS
Loans current and past due less than 30 days	$ 1,584,535	$ 1,627,899
Loans receivable	1,597,856	1,644,209
Past Due 30-89 Days
LOANS
Loans past due	4,207	8,607
Past Due 90+ Days
LOANS
Loans past due	9,114	7,703
Commercial
LOANS
Loans current and past due less than 30 days	978,076	1,002,260
Loans receivable	985,403	1,007,751
Commercial \| Past Due 30-89 Days
LOANS
Loans past due	695	2,453
Commercial \| Past Due 90+ Days
LOANS
Loans past due	6,632	3,038
Commercial \| Real estate loan
LOANS
Loans current and past due less than 30 days	538,713	529,998
Loans receivable	544,202	531,810
Commercial \| Real estate loan \| Past Due 30-89 Days
LOANS
Loans past due	110	66
Commercial \| Real estate loan \| Past Due 90+ Days
LOANS
Loans past due	5,379	1,746
Commercial \| Commercial and industrial
LOANS
Loans current and past due less than 30 days	157,967	158,523
Loans receivable	158,907	159,577
Commercial \| Commercial and industrial \| Past Due 30-89 Days
LOANS
Loans past due	25	55
Commercial \| Commercial and industrial \| Past Due 90+ Days
LOANS
Loans past due	915	999
Commercial \| Paycheck Protection Program - 1st Draw
LOANS
Loans current and past due less than 30 days	37,902	132,269
Loans receivable	37,902	132,269
Commercial \| Paycheck Protection Program - 1st Draw \| Past Due 30-89 Days
LOANS
Loans past due	0	0
Commercial \| Paycheck Protection Program - 1st Draw \| Past Due 90+ Days
LOANS
Loans past due	0	0
Commercial \| Paycheck Protection Program - 2nd Draw
LOANS
Loans current and past due less than 30 days	72,409	0
Loans receivable	72,409	0
Commercial \| Paycheck Protection Program - 2nd Draw \| Past Due 30-89 Days
LOANS
Loans past due	0	0
Commercial \| Paycheck Protection Program - 2nd Draw \| Past Due 90+ Days
LOANS
Loans past due	0	0
Commercial \| Political subdivisions
LOANS
Loans current and past due less than 30 days	48,849	53,221
Loans receivable	48,849	53,221
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 \| Construction Loans
LOANS
Loans current and past due less than 30 days	42,649	42,590
Loans receivable	43,178	42,874
Commercial \| Construction Loans \| Past Due 30-89 Days
LOANS
Loans past due	529	284
Commercial \| Construction Loans \| 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	10,647	11,419
Loans receivable	10,950	11,736
Commercial \| Loans secured by farm land \| Past Due 30-89 Days
LOANS
Loans past due	31	95
Commercial \| Loans secured by farm land \| Past Due 90+ Days
LOANS
Loans past due	272	222
Commercial \| Multi-family (5 or more) residential
LOANS
Loans current and past due less than 30 days	51,916	53,860
Loans receivable	51,916	55,811
Commercial \| Multi-family (5 or more) residential \| Past Due 30-89 Days
LOANS
Loans past due	0	1,951
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	2,313	3,091
Loans receivable	2,379	3,164
Commercial \| Agricultural loans \| Past Due 30-89 Days
LOANS
Loans past due	0	2
Commercial \| Agricultural loans \| Past Due 90+ Days
LOANS
Loans past due	66	71
Commercial \| Other commercial loans
LOANS
Loans current and past due less than 30 days	14,711	17,289
Loans receivable	14,711	17,289
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
Residential mortgage
LOANS
Loans current and past due less than 30 days	590,026	609,576
Loans receivable	595,865	620,172
Residential mortgage \| Past Due 30-89 Days
LOANS
Loans past due	3,455	6,071
Residential mortgage \| Past Due 90+ Days
LOANS
Loans past due	2,384	4,525
Residential mortgage \| Real estate loan \| first liens
LOANS
Loans current and past due less than 30 days	502,311	523,191
Loans receivable	507,579	532,947
Residential mortgage \| Real estate loan \| first liens \| Past Due 30-89 Days
LOANS
Loans past due	3,143	5,703
Residential mortgage \| Real estate loan \| first liens \| Past Due 90+ Days
LOANS
Loans past due	2,125	4,053
Residential mortgage \| Real estate loan \| junior liens
LOANS
Loans current and past due less than 30 days	25,138	27,009
Loans receivable	25,287	27,311
Residential mortgage \| Real estate loan \| junior liens \| Past Due 30-89 Days
LOANS
Loans past due	32	111
Residential mortgage \| Real estate loan \| junior liens \| Past Due 90+ Days
LOANS
Loans past due	117	191
Residential mortgage \| Construction Loans
LOANS
Loans current and past due less than 30 days	23,567	20,457
Loans receivable	23,567	20,613
Residential mortgage \| Construction Loans \| Past Due 30-89 Days
LOANS
Loans past due	0	156
Residential mortgage \| Construction Loans \| Past Due 90+ Days
LOANS
Loans past due	0	0
Residential mortgage \| Home equity lines of credit
LOANS
Loans current and past due less than 30 days	39,010	38,919
Loans receivable	39,432	39,301
Residential mortgage \| Home equity lines of credit \| Past Due 30-89 Days
LOANS
Loans past due	280	101
Residential mortgage \| Home equity lines of credit \| Past Due 90+ Days
LOANS
Loans past due	142	281
Consumer
LOANS
Loans current and past due less than 30 days	16,433	16,063
Loans receivable	16,588	16,286
Consumer \| Past Due 30-89 Days
LOANS
Loans past due	57	83
Consumer \| Past Due 90+ Days
LOANS
Loans past due	$ 98	$ 140