SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	$ 21,153	$ 18,552	$ 17,304	$ 15,815
Allowance for credit losses - off-balance sheet credit exposure	1,265	165	165
Real Estate Loans [Member] | Residential [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	2,354	1,056	1,147	1,174
Real Estate Loans [Member] | Commercial [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	9,178	10,120	8,099	6,216
Real Estate Loans [Member] | Agricultural [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	3,264	4,589	4,729	4,953
Real Estate Loans [Member] | Construction [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	1,950	801	434	122
Consumer [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	1,496	135	262	321
Other Commercial Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	2,229	1,040	1,023	1,226
Other Agricultural Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	270	489	558	864
State and Political Subdivision Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	45	322	281	479
Unallocated [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses	$ 367	0	$ 771	$ 460
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		(3,300)
Allowance for credit losses - off-balance sheet credit exposure		1,064
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate Loans [Member] | Residential [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		79
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate Loans [Member] | Commercial [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		(3,070)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate Loans [Member] | Agricultural [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		(1,145)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate Loans [Member] | Construction [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		(103)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Consumer [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		1,040
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Other Commercial Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		(328)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Other Agricultural Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		(219)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | State and Political Subdivision Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		(280)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Unallocated [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		726
As Reported [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		15,252
Allowance for credit losses - off-balance sheet credit exposure		1,229
As Reported [Member] | Real Estate Loans [Member] | Residential [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		1,135
As Reported [Member] | Real Estate Loans [Member] | Commercial [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		7,050
As Reported [Member] | Real Estate Loans [Member] | Agricultural [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		3,444
As Reported [Member] | Real Estate Loans [Member] | Construction [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		698
As Reported [Member] | Consumer [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		1,175
As Reported [Member] | Other Commercial Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		712
As Reported [Member] | Other Agricultural Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		270
As Reported [Member] | State and Political Subdivision Loans [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		42
As Reported [Member] | Unallocated [Member]
Impact of Change from Incurred Loss Model to Current Expected Credit Loss Model [Abstract]
Allowance for Credit Losses		$ 726