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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 1,382,975		$ 1,340,325
Less: Allowance for credit losses	(25,899)	$ (22,966)	(22,401)	$ (21,347)	$ (20,205)	$ (20,549)
Loans receivable, net	$ 1,357,076		$ 1,317,924
% 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	$ (21,421)	(18,251)	$ (17,654)	(17,164)	(16,244)	(16,516)
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	$ 729,330		$ 681,646
% of Total	52.70%		50.90%
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	$ 71,293		$ 69,042
% of Total	5.20%		5.10%
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	$ 253,072		$ 245,491
% of Total	18.30%		18.30%
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	$ 55,850		$ 75,399
% of Total	4.00%		5.60%
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	$ (2,272)	(2,626)	$ (2,358)	(1,658)	(1,430)	(1,330)
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	$ 117,018		$ 105,756
% of Total	8.50%		7.90%
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	$ 29,424		$ 33,364
% of Total	2.10%		2.50%
Residential Mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Less: Allowance for credit losses	$ (2,047)	(1,939)	$ (2,230)	(2,347)	(2,338)	(2,489)
Residential Mortgage \| Residential mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 116,757		$ 121,666
% of Total	8.50%		9.10%
Residential Mortgage \| Purchased HELOC loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 1,405		$ 1,739
% of Total	0.10%		0.10%
Consumer Installment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Less: Allowance for credit losses	$ (159)	$ (150)	$ (159)	$ (178)	$ (193)	$ (214)
Consumer Installment \| Originated indirect paper
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 1,559		$ 2,225
% of Total	0.10%		0.20%
Consumer Installment \| Other consumer
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total loans receivable	$ 7,267		$ 3,997
% of Total	0.50%		0.30%