Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 17,304	$ 15,815
Charge-offs	(5)	(4)
Recoveries	7	99
Provision	250	650
Balance at end of period	17,556	16,560
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,147	1,174
Charge-offs	0	0
Recoveries	0	0
Provision	(77)	(7)
Balance at end of period	1,070	1,167
Real Estate Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	8,099	6,216
Charge-offs	0	0
Recoveries	0	89
Provision	295	378
Balance at end of period	8,394	6,683
Real Estate Loans [Member] | Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,729	4,953
Charge-offs	0	0
Recoveries	0	0
Provision	(213)	(36)
Balance at end of period	4,516	4,917
Real Estate Loans [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	434	122
Charge-offs	0	0
Recoveries	0	0
Provision	63	29
Balance at end of period	497	151
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	262	321
Charge-offs	(5)	(4)
Recoveries	5	6
Provision	(52)	(86)
Balance at end of period	210	237
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,023	1,226
Charge-offs	0	0
Recoveries	2	4
Provision	355	274
Balance at end of period	1,380	1,504
Other Agricultural Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	558	864
Charge-offs	0	0
Recoveries	0	0
Provision	(7)	(75)
Balance at end of period	551	789
State and Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	281	479
Charge-offs	0	0
Recoveries	0	0
Provision	4	(9)
Balance at end of period	285	470
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	771	460
Charge-offs	0	0
Recoveries	0	0
Provision	(118)	182
Balance at end of period	$ 653	$ 642