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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 1,424,828		$ 1,460,792
Allowance for credit losses	(21,000)	$ (21,178)	(22,908)	$ (22,973)	$ (23,164)	$ (17,939)
Loans receivable, net	$ 1,403,828		$ 1,437,884
Total, percent	100.00%		100.00%
Commercial/Agricultural Real Estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for credit losses	$ (16,923)	(17,033)	$ (18,784)	(18,855)	(18,933)	(14,085)
Commercial/Agricultural Real Estate | Commercial real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 728,447		$ 748,447
Total, percent	51.10%		51.20%
Commercial/Agricultural Real Estate | Agricultural real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 75,613		$ 83,157
Total, percent	5.30%		5.70%
Commercial/Agricultural Real Estate | Multi-family real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 239,065		$ 228,004
Total, percent	16.80%		15.60%
Commercial/Agricultural Real Estate | Construction and land development
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 87,381		$ 110,218
Total, percent	6.10%		7.50%
C&I/Agricultural operating:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for credit losses	$ (1,351)	(1,117)	$ (1,105)	(1,189)	(1,458)	(2,318)
C&I/Agricultural operating: | Commercial and industrial
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 119,514		$ 121,190
Total, percent	8.40%		8.30%
C&I/Agricultural operating: | Agricultural operating
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 27,567		$ 25,695
Total, percent	1.90%		1.80%
Residential mortgage:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for credit losses	$ (2,494)	(2,784)	$ (2,744)	(2,633)	(2,452)	(599)
Residential mortgage: | Residential mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 134,467		$ 128,479
Total, percent	9.50%		8.80%
Residential mortgage: | Purchased HELOC loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 2,932		$ 2,880
Total, percent	0.20%		0.20%
Consumer installment:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for credit losses	$ (232)	$ (244)	$ (275)	$ (296)	$ (321)	$ (129)
Consumer installment: | Originated indirect paper
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 4,405		$ 6,535
Total, percent	0.30%		0.40%
Consumer installment: | Other consumer
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 5,437		$ 6,187
Total, percent	0.40%		0.40%

X

- Definition

Percentage, before allowance for credit loss, of financing receivable to total financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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