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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 1,424,988		$ 1,416,135	$ 1,351,827
Unearned net deferred fees and costs and loans in process			(2,585)
Unamortized discount on acquired loans			(1,766)
Total allowance for credit losses on loans	1,424,988		1,411,784
Allowance for credit losses	(23,164)	$ (22,679)	(17,939)
Loans receivable, net	$ 1,401,824		$ 1,393,845
Total, percent	100.00%		100.30%
Unearned net deferred fees and costs and loans in process, (in percent)			(0.20%)
Unamortized discount on acquired loans (in percent)			(0.10%)
Total loans receivable (in percent)			100.00%
Commercial/Agricultural Real Estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans			$ 1,125,279	1,075,841
Allowance for credit losses	$ (18,933)	(18,496)	(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	$ 730,391		$ 725,971
Total, percent	51.30%		51.50%
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	$ 86,959		$ 87,908
Total, percent	6.10%		6.20%
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	$ 208,109		$ 208,908
Total, percent	14.60%		14.80%
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	$ 104,891		$ 102,492
Total, percent	7.40%		7.30%
C&I/Agricultural operating
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans			$ 164,819	163,471
Allowance for credit losses	$ (1,458)	(1,848)	(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	$ 133,248		$ 136,013
Total, percent	9.40%		9.60%
C&I/Agricultural operating | Agricultural operating
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 24,381		$ 28,806
Total, percent	1.70%		2.00%
Residential Mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans			$ 108,651	91,994
Allowance for credit losses	$ (2,452)	(2,000)	(599)
Residential Mortgage | Residential mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 119,118		$ 105,389
Total, percent	8.40%		7.50%
Residential Mortgage | Purchased HELOC loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 3,216		$ 3,262
Total, percent	0.20%		0.20%
Consumer Installment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans			$ 17,386	$ 20,521
Allowance for credit losses	$ (321)	$ (335)	(129)
Consumer Installment | Originated indirect paper
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 8,189		$ 10,236
Total, percent	0.60%		0.70%
Consumer Installment | Other consumer
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Total Loans	$ 6,486		$ 7,150
Total, percent	0.50%		0.50%

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