Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 18,552	$ 17,304
Charge-offs	(7)	(5)
Recoveries	5	7
Provision	0	250
Balance at end of period	15,250	17,556
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	(3,300)
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	(1)
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	0
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs	0
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,056	1,147
Charge-offs	0	0
Recoveries	0	0
Provision	60	(77)
Balance at end of period	1,195	1,070
Real Estate Loans [Member] | Residential [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	79
Real Estate Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	10,120	8,099
Charge-offs	0	0
Recoveries	0	0
Provision	(303)	295
Balance at end of period	6,747	8,394
Real Estate Loans [Member] | Commercial [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	(3,070)
Real Estate Loans [Member] | Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,589	4,729
Charge-offs	0	0
Recoveries	0	0
Provision	(35)	(213)
Balance at end of period	3,409	4,516
Real Estate Loans [Member] | Agricultural [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	(1,145)
Real Estate Loans [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	801	434
Charge-offs	0	0
Recoveries	0	0
Provision	153	63
Balance at end of period	851	497
Real Estate Loans [Member] | Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	(103)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	135	262
Charge-offs	(7)	(5)
Recoveries	4	5
Provision	48	(52)
Balance at end of period	1,220	210
Consumer [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,040
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,040	1,023
Charge-offs	0	0
Recoveries	1	2
Provision	(1)	355
Balance at end of period	712	1,380
Other Commercial Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	(328)
Other Agricultural Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	489	558
Charge-offs	0	0
Recoveries	0	0
Provision	(20)	(7)
Balance at end of period	250	551
Other Agricultural Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	(219)
Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	322	281
Charge-offs	0	0
Recoveries	0	0
Provision	0	4
Balance at end of period	42	285
Subdivision Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	(280)
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	0	771
Charge-offs	0	0
Recoveries	0	0
Provision	98	(118)
Balance at end of period	824	$ 653
Unallocated [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 726