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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	$ 1,450,159	$ 1,460,792
Total Loans	1,450,159	1,460,792
Financial Asset, Past Due
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	6,033	10,524
30-59 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	2,326	1,405
60-89 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	547	891
Greater Than 89 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	3,160	8,228
Current
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	1,444,126	1,450,268
Commercial/Agricultural real estate: | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	743,630	748,447
Total Loans	743,630	748,447
Commercial/Agricultural real estate: | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	80,267	83,157
Total Loans	80,267	83,157
Commercial/Agricultural real estate: | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	235,318	228,004
Total Loans	235,318	228,004
Commercial/Agricultural real estate: | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	93,055	110,218
Total Loans	93,055	110,218
Commercial/Agricultural real estate: | Financial Asset, Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	541	5,937
Commercial/Agricultural real estate: | Financial Asset, Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	441	391
Commercial/Agricultural real estate: | Financial Asset, Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Commercial/Agricultural real estate: | Financial Asset, Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	54
Commercial/Agricultural real estate: | 30-59 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	50
Commercial/Agricultural real estate: | 30-59 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	87	30
Commercial/Agricultural real estate: | 30-59 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Commercial/Agricultural real estate: | 30-59 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Commercial/Agricultural real estate: | 60-89 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	50	308
Commercial/Agricultural real estate: | 60-89 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Commercial/Agricultural real estate: | 60-89 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Commercial/Agricultural real estate: | 60-89 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Commercial/Agricultural real estate: | Greater Than 89 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	491	5,579
Commercial/Agricultural real estate: | Greater Than 89 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	354	361
Commercial/Agricultural real estate: | Greater Than 89 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Commercial/Agricultural real estate: | Greater Than 89 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	54
Commercial/Agricultural real estate: | Current | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	743,089	742,510
Commercial/Agricultural real estate: | Current | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	79,826	82,766
Commercial/Agricultural real estate: | Current | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	235,318	228,004
Commercial/Agricultural real estate: | Current | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	93,055	110,164
C&I/Agricultural operating: | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	128,011	121,190
Total Loans	128,011	121,190
C&I/Agricultural operating: | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	26,244	25,695
Total Loans	26,244	25,695
C&I/Agricultural operating: | Financial Asset, Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	810	248
C&I/Agricultural operating: | Financial Asset, Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	1,192	1,179
C&I/Agricultural operating: | 30-59 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	373	248
C&I/Agricultural operating: | 30-59 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	71	0
C&I/Agricultural operating: | 60-89 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
C&I/Agricultural operating: | 60-89 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	15	0
C&I/Agricultural operating: | Greater Than 89 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	437	0
C&I/Agricultural operating: | Greater Than 89 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	1,106	1,179
C&I/Agricultural operating: | Current | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	127,201	120,942
C&I/Agricultural operating: | Current | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	25,052	24,516
Residential mortgage: | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	129,139	128,479
Total Loans	129,139	128,479
Residential mortgage: | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	2,895	2,880
Total Loans	2,895	2,880
Residential mortgage: | Financial Asset, Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	2,863	2,462
Residential mortgage: | Financial Asset, Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	117	117
Residential mortgage: | 30-59 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	1,741	856
Residential mortgage: | 30-59 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	117
Residential mortgage: | 60-89 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	365	583
Residential mortgage: | 60-89 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	117	0
Residential mortgage: | Greater Than 89 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	757	1,023
Residential mortgage: | Greater Than 89 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Residential mortgage: | Current | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	126,276	126,017
Residential mortgage: | Current | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	2,778	2,763
Consumer installment: | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	5,851	6,535
Total Loans	5,851	6,535
Consumer installment: | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	5,749	6,187
Total Loans	5,749	6,187
Consumer installment: | Financial Asset, Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	47	78
Consumer installment: | Financial Asset, Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	22	58
Consumer installment: | 30-59 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	35	66
Consumer installment: | 30-59 Days Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	19	38
Consumer installment: | 60-89 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Consumer installment: | 60-89 Days Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	0	0
Consumer installment: | Greater Than 89 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	12	12
Consumer installment: | Greater Than 89 Days Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	3	20
Consumer installment: | Current | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	5,804	6,457
Consumer installment: | Current | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Loans receivable	$ 5,727	$ 6,129

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481598/310-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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