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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 1,323,010		$ 1,368,981
Less: Allowance for credit losses	(22,182)	$ (21,347)	(20,549)	$ (21,000)	$ (21,178)	$ (22,908)
Loans receivable, net	$ 1,300,828		$ 1,348,432
% of Total	100.00%		100.00%
Commercial/Agricultural Real Estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Less: Allowance for credit losses	$ (17,552)	(17,164)	$ (16,516)	(16,923)	(17,033)	(18,784)
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 receivable	$ 682,440		$ 707,009
% of Total	51.60%		51.70%
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 receivable	$ 64,001		$ 72,738
% of Total	4.80%		5.30%
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 receivable	$ 237,068		$ 220,706
% of Total	17.90%		16.10%
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 receivable	$ 74,354		$ 78,146
% of Total	5.60%		5.70%
C&I/Agricultural operating:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Less: Allowance for credit losses	$ (2,144)	(1,658)	$ (1,330)	(1,351)	(1,117)	(1,105)
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 receivable	$ 101,535		$ 115,535
% of Total	7.70%		8.40%
C&I/Agricultural operating: | Agricultural operating
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 30,078		$ 31,017
% of Total	2.30%		2.30%
Residential mortgage:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Less: Allowance for credit losses	$ (2,323)	(2,347)	$ (2,489)	(2,494)	(2,784)	(2,744)
Residential mortgage: | Residential mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 124,834		$ 131,892
% of Total	9.40%		9.60%
Residential mortgage: | Purchased HELOC loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 1,979		$ 2,956
% of Total	0.20%		0.20%
Consumer installment:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Less: Allowance for credit losses	$ (163)	$ (178)	$ (214)	$ (232)	$ (244)	$ (275)
Consumer installment: | Originated indirect paper
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 2,566		$ 3,970
% of Total	0.20%		0.30%
Consumer installment: | Other consumer
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 4,155		$ 5,012
% of Total	0.30%		0.40%

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