LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Allowance for Loans by Loan Portfolio (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Allowance for Loan Losses:
Beginning balance	$ 10,320
Provision	7,750	$ 3,525
Ending balance	17,043	10,320
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Amount of allowance for loan losses arising from loans individually evaluated for impairment	1,115	956
Amount of allowance for loan losses arising from loans collectively evaluated for impairment	15,928	9,364
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	1,246,889	1,187,264
Ending balance: individually evaluated for impairment	43,397	63,196
Ending balance: collectively evaluated for impairment	1,203,492	1,124,068
Commercial/Agricultural real estate:
Allowance for Loan Losses:
Beginning balance	6,731
Ending balance	11,955	6,731
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Amount of allowance for loan losses arising from loans individually evaluated for impairment	698	495
Amount of allowance for loan losses arising from loans collectively evaluated for impairment	11,257	6,236
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	797,139	773,240
Ending balance: individually evaluated for impairment	26,303	42,658
Ending balance: collectively evaluated for impairment	770,836	730,582
C&I/Agricultural operating:
Allowance for Loan Losses:
Beginning balance	1,670
Ending balance	2,253	1,670
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Amount of allowance for loan losses arising from loans individually evaluated for impairment	190	312
Amount of allowance for loan losses arising from loans collectively evaluated for impairment	2,063	1,358
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	273,040	171,514
Ending balance: individually evaluated for impairment	7,115	9,966
Ending balance: collectively evaluated for impairment	265,925	161,548
Residential mortgage:
Allowance for Loan Losses:
Beginning balance	1,042
Ending balance	1,376	1,042
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Amount of allowance for loan losses arising from loans individually evaluated for impairment	226	136
Amount of allowance for loan losses arising from loans collectively evaluated for impairment	1,150	906
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	137,646	184,739
Ending balance: individually evaluated for impairment	9,621	10,126
Ending balance: collectively evaluated for impairment	128,025	174,613
Consumer installment:
Allowance for Loan Losses:
Beginning balance	520
Ending balance	553	520
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Amount of allowance for loan losses arising from loans individually evaluated for impairment	1	13
Amount of allowance for loan losses arising from loans collectively evaluated for impairment	552	507
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	39,064	57,771
Ending balance: individually evaluated for impairment	358	446
Ending balance: collectively evaluated for impairment	38,706	57,325
Unallocated
Allowance for Loan Losses:
Beginning balance	357
Ending balance	906	357
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Amount of allowance for loan losses arising from loans individually evaluated for impairment	0	0
Amount of allowance for loan losses arising from loans collectively evaluated for impairment	906	357
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	0	0
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	0	0
Originated Loans
Allowance for Loan Losses:
Beginning balance	9,551	7,119
Charge-offs	(1,082)	(732)
Recoveries	159	84
Provision	6,191	3,080
Ending balance	14,819	9,551
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	960,725	762,520
Originated Loans | Commercial/Agricultural real estate:
Allowance for Loan Losses:
Beginning balance	6,205	4,019
Charge-offs	0	(355)
Recoveries	75	0
Provision	3,991	2,541
Ending balance	10,271	6,205
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	586,826	479,916
Originated Loans | C&I/Agricultural operating:
Allowance for Loan Losses:
Beginning balance	1,643	1,258
Charge-offs	(932)	0
Recoveries	8	0
Provision	1,393	385
Ending balance	2,112	1,643
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	243,449	110,447
Originated Loans | Residential mortgage:
Allowance for Loan Losses:
Beginning balance	879	1,048
Charge-offs	(5)	(120)
Recoveries	7	0
Provision	160	(49)
Ending balance	1,041	879
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	92,543	117,026
Originated Loans | Consumer installment:
Allowance for Loan Losses:
Beginning balance	467	641
Charge-offs	(145)	(257)
Recoveries	69	84
Provision	98	(1)
Ending balance	489	467
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	37,907	55,131
Originated Loans | Unallocated
Allowance for Loan Losses:
Beginning balance	357	153
Charge-offs	0	0
Recoveries	0	0
Provision	549	204
Ending balance	906	357
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	0	0
Accountable for under ASC 310-30 (PCI loans)
Allowance for Loan Losses:
Beginning balance	0
Ending balance	0	0
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	17,946	38,268
Accountable for under ASC 310-30 (PCI loans) | Commercial/Agricultural real estate:
Allowance for Loan Losses:
Beginning balance	0
Ending balance	0	0
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	15,100	31,408
Accountable for under ASC 310-30 (PCI loans) | C&I/Agricultural operating:
Allowance for Loan Losses:
Beginning balance	0
Ending balance	0	0
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	1,534	4,666
Accountable for under ASC 310-30 (PCI loans) | Residential mortgage:
Allowance for Loan Losses:
Beginning balance	0
Ending balance	0	0
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	1,312	2,194
Accountable for under ASC 310-30 (PCI loans) | Consumer installment:
Allowance for Loan Losses:
Beginning balance	0
Ending balance	0	0
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	0	0
Accountable for under ASC 310-30 (PCI loans) | Unallocated
Allowance for Loan Losses:
Beginning balance	0
Ending balance	0	0
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	0	0
Other Acquired Loans
Allowance for Loan Losses:
Beginning balance	769	485
Charge-offs	(236)	(179)
Recoveries	132	18
Provision	1,559	445
Ending balance	2,224	769
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	268,218	386,476
Other Acquired Loans | Commercial/Agricultural real estate:
Allowance for Loan Losses:
Beginning balance	526	183
Charge-offs	0	(26)
Recoveries	77	3
Provision	1,081	366
Ending balance	1,684	526
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	195,213	261,916
Other Acquired Loans | C&I/Agricultural operating:
Allowance for Loan Losses:
Beginning balance	27	32
Charge-offs	(159)	0
Recoveries	33	0
Provision	240	(5)
Ending balance	141	27
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	28,057	56,401
Other Acquired Loans | Residential mortgage:
Allowance for Loan Losses:
Beginning balance	163	205
Charge-offs	(74)	(120)
Recoveries	15	5
Provision	231	73
Ending balance	335	163
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	43,791	65,519
Other Acquired Loans | Consumer installment:
Allowance for Loan Losses:
Beginning balance	53	65
Charge-offs	(3)	(33)
Recoveries	7	10
Provision	7	11
Ending balance	64	53
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	1,157	2,640
Other Acquired Loans | Unallocated
Allowance for Loan Losses:
Beginning balance	0	0
Charge-offs	0	0
Recoveries	0	0
Provision	0	0
Ending balance	0	0
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	0	0
Acquired Loans
Allowance for Loan Losses:
Beginning balance	769
Ending balance	2,224	769
Loans Receivable:
Total Past Due Accruing and Nonaccrual Loans	286,164	424,744
Acquired Loans | Commercial/Agricultural real estate:
Allowance for Loan Losses:
Beginning balance	526
Ending balance	1,684	526
Acquired Loans | C&I/Agricultural operating:
Allowance for Loan Losses:
Beginning balance	27
Ending balance	141	27
Acquired Loans | Residential mortgage:
Allowance for Loan Losses:
Beginning balance	163
Ending balance	335	163
Acquired Loans | Consumer installment:
Allowance for Loan Losses:
Beginning balance	53
Ending balance	64	53
Acquired Loans | Unallocated
Allowance for Loan Losses:
Beginning balance	0
Ending balance	$ 0	$ 0