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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	$ 1,416,135	$ 1,317,045
Unearned net deferred fees and costs and loans in process	(2,585)	(2,482)
Unamortized discount on acquired loans	(1,766)	(3,600)
Allowance for loan losses	(17,939)	(16,913)
Loans receivable, net	1,393,845	1,294,050
Total originated loans before SBA PPP loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	1,416,135	1,308,290
SBA PPP loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	0	8,755
Commercial/Agricultural real estate:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	1,125,279	1,034,829
Allowance for loan losses	(14,085)	(13,210)
Commercial/Agricultural real estate: | Commercial real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	725,971	698,465
Commercial/Agricultural real estate: | Agricultural real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	87,908	78,495
Commercial/Agricultural real estate: | Multi-family real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	208,908	178,349
Commercial/Agricultural real estate: | Construction and land development
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	102,492	79,520
C&I/Agricultural operating:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	164,819	162,510
Allowance for loan losses	(2,318)	(2,028)
C&I/Agricultural operating: | Commercial and industrial
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	136,013	122,167
C&I/Agricultural operating: | Agricultural operating
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	28,806	31,588
Residential mortgage:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	108,651	94,861
Allowance for loan losses	(599)	(648)
Residential mortgage: | Residential mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	105,389	90,990
Residential mortgage: | Purchased HELOC loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	3,262	3,871
Consumer installment:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	17,386	24,845
Allowance for loan losses	(129)	(253)
Consumer installment: | Originated indirect paper
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	10,236	15,971
Consumer installment: | Other Consumer
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	7,150	8,874
Originated Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	1,272,943	1,118,494
Allowance for loan losses	(17,309)	(15,830)	$ (14,819)
Originated Loans | Total originated loans before SBA PPP loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	1,272,943	1,109,739
Originated Loans | SBA PPP loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	0	8,755
Originated Loans | Commercial/Agricultural real estate:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	1,017,529	883,430
Allowance for loan losses	(13,551)	(12,354)	(10,271)
Originated Loans | Commercial/Agricultural real estate: | Commercial real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	640,816	578,395
Originated Loans | Commercial/Agricultural real estate: | Agricultural real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	69,431	52,372
Originated Loans | Commercial/Agricultural real estate: | Multi-family real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	205,601	174,050
Originated Loans | Commercial/Agricultural real estate: | Construction and land development
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	101,681	78,613
Originated Loans | C&I/Agricultural operating:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	150,239	142,894
Allowance for loan losses	(2,255)	(1,959)	(2,112)
Originated Loans | C&I/Agricultural operating: | Commercial and industrial
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	127,115	107,937
Originated Loans | C&I/Agricultural operating: | Agricultural operating
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	23,124	26,202
Originated Loans | Residential mortgage:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	88,045	67,726
Allowance for loan losses	(574)	(518)	(1,041)
Originated Loans | Residential mortgage: | Residential mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	84,783	63,855
Originated Loans | Residential mortgage: | Purchased HELOC loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	3,262	3,871
Originated Loans | Consumer installment:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	17,130	24,444
Allowance for loan losses	(121)	(225)	$ (489)
Originated Loans | Consumer installment: | Originated indirect paper
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	10,236	15,971
Originated Loans | Consumer installment: | Other Consumer
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	6,894	8,473
Acquired Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	143,192	198,551
Allowance for loan losses	(630)	(1,083)
Acquired Loans | Commercial/Agricultural real estate:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for loan losses	(534)	(856)
Acquired Loans | Commercial/Agricultural real estate: | Commercial real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	85,155	120,070
Acquired Loans | Commercial/Agricultural real estate: | Agricultural real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	18,477	26,123
Acquired Loans | Commercial/Agricultural real estate: | Multi-family real estate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	3,307	4,299
Acquired Loans | Commercial/Agricultural real estate: | Construction and land development
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	811	907
Acquired Loans | C&I/Agricultural operating:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for loan losses	(63)	(69)
Acquired Loans | C&I/Agricultural operating: | Commercial and industrial
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	8,898	14,230
Acquired Loans | C&I/Agricultural operating: | Agricultural operating
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	5,682	5,386
Acquired Loans | Residential mortgage:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for loan losses	(25)	(130)
Acquired Loans | Residential mortgage: | Residential mortgage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	20,606	27,135
Acquired Loans | Consumer installment:
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for loan losses	(8)	(28)
Acquired Loans | Consumer installment: | Other Consumer
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans receivable	$ 256	$ 401

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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