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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	$ 10,255	$ 21,195
Nonaccrual Loans	8,679	10,747
Total Past Due Accruing and Nonaccrual Loans	18,934	31,942
Current	1,182,328	1,214,947
Total Loans	1,201,262	1,246,889	$ 1,189,425
SBA PPP loans
Aging analysis of the Bank's real estate and consumer loans
Total Loans	118,931	123,702
30-59 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	7,281	18,886
60-89 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	2,438	1,723
Greater Than 89 Days
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	536	586
Commercial/agriculture real estate
Aging analysis of the Bank's real estate and consumer loans
Total Loans	795,476	797,139	802,469
Commercial/agriculture real estate | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	3,218	10,035
Nonaccrual Loans	760	679
Total Past Due Accruing and Nonaccrual Loans	3,978	10,714
Current	511,211	496,961
Total Loans	515,189	507,675
Commercial/agriculture real estate | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	361	459
Nonaccrual Loans	4,511	5,084
Total Past Due Accruing and Nonaccrual Loans	4,872	5,543
Current	65,695	63,252
Total Loans	70,567	68,795
Commercial/agriculture real estate | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	308
Nonaccrual Loans	0	148
Total Past Due Accruing and Nonaccrual Loans	0	456
Current	118,988	121,696
Total Loans	118,988	122,152
Commercial/agriculture real estate | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	204	3,898
Nonaccrual Loans	0	0
Total Past Due Accruing and Nonaccrual Loans	204	3,898
Current	90,528	94,619
Total Loans	90,732	98,517
Commercial/agriculture real estate | 30-59 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	1,788	9,568
Commercial/agriculture real estate | 30-59 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	361	411
Commercial/agriculture real estate | 30-59 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	308
Commercial/agriculture real estate | 30-59 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	3,898
Commercial/agriculture real estate | 60-89 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	1,430	467
Commercial/agriculture real estate | 60-89 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	48
Commercial/agriculture real estate | 60-89 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
Commercial/agriculture real estate | 60-89 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	204	0
Commercial/agriculture real estate | Greater Than 89 Days | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
Commercial/agriculture real estate | Greater Than 89 Days | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
Commercial/agriculture real estate | Greater Than 89 Days | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
Commercial/agriculture real estate | Greater Than 89 Days | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
C&I/Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total Loans	243,114	273,040	159,946
C&I/Agricultural operating | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	737	927
Nonaccrual Loans	391	357
Total Past Due Accruing and Nonaccrual Loans	1,128	1,284
Current	94,805	115,269
Total Loans	95,933	116,553
C&I/Agricultural operating | SBA PPP loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
Nonaccrual Loans	0	0
Total Past Due Accruing and Nonaccrual Loans	0	0
Current	118,931	123,702
Total Loans	118,931	123,702
C&I/Agricultural operating | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	2,885	1,699
Nonaccrual Loans	764	1,872
Total Past Due Accruing and Nonaccrual Loans	3,649	3,571
Current	24,601	29,214
Total Loans	28,250	32,785
C&I/Agricultural operating | 30-59 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	592	436
C&I/Agricultural operating | 30-59 Days Past Due | SBA PPP loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
C&I/Agricultural operating | 30-59 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	2,506	1,499
C&I/Agricultural operating | 60-89 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	145	491
C&I/Agricultural operating | 60-89 Days Past Due | SBA PPP loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
C&I/Agricultural operating | 60-89 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	379	200
C&I/Agricultural operating | Greater Than 89 Days | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
C&I/Agricultural operating | Greater Than 89 Days | SBA PPP loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
C&I/Agricultural operating | Greater Than 89 Days | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total Loans	127,622	137,646	173,412
Residential mortgage | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	2,734	3,126
Nonaccrual Loans	1,933	2,217
Total Past Due Accruing and Nonaccrual Loans	4,667	5,343
Current	117,664	126,043
Total Loans	122,331	131,386
Residential mortgage | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	499
Nonaccrual Loans	234	234
Total Past Due Accruing and Nonaccrual Loans	234	733
Current	5,057	5,527
Total Loans	5,291	6,260
Residential mortgage | 30-59 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	1,974	2,238
Residential mortgage | 30-59 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	338
Residential mortgage | 60-89 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	246	372
Residential mortgage | 60-89 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	94
Residential mortgage | Greater Than 89 Days | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	514	516
Residential mortgage | Greater Than 89 Days | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	67
Consumer installment
Aging analysis of the Bank's real estate and consumer loans
Total Loans	35,050	39,064	$ 53,598
Consumer installment | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	53	127
Nonaccrual Loans	64	133
Total Past Due Accruing and Nonaccrual Loans	117	260
Current	23,069	25,591
Total Loans	23,186	25,851
Consumer installment | Other Consumer
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	63	117
Nonaccrual Loans	22	23
Total Past Due Accruing and Nonaccrual Loans	85	140
Current	11,779	13,073
Total Loans	11,864	13,213
Consumer installment | 30-59 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	20	90
Consumer installment | 30-59 Days Past Due | Other Consumer
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	40	100
Consumer installment | 60-89 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	33	37
Consumer installment | 60-89 Days Past Due | Other Consumer
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	1	14
Consumer installment | Greater Than 89 Days | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	0	0
Consumer installment | Greater Than 89 Days | Other Consumer
Aging analysis of the Bank's real estate and consumer loans
Total Past Due and Accruing	$ 22	$ 3

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