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Loans and Allowance for Credit Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans		$ 1,309,800	$ 1,189,782
Loan 90 days and accruing		0	0
Agricultural [Member]
Financing Receivable, Past Due [Line Items]
Loans		43,290	64,159
Loan 90 days and accruing		0	0
Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans		222,357	210,210
Loan 90 days and accruing		0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans		37,605	39,808
Loan 90 days and accruing		0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans		709,960	630,953
Loan 90 days and accruing		0	0
Construction Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans		16,477	14,736
Loan 90 days and accruing		0	0
Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans		256,348	229,916
Loan 90 days and accruing			0
Loans To Other Financial Institutions [Member]
Financing Receivable, Past Due [Line Items]
Loans		23,763
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	1,451	721
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	101
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	30	39
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	1,320	682
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	36	178
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0	171
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	6	7
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	30
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	792	842
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	90
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	702	842
Financial Asset, Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	2,279	1,741
Financial Asset, Past Due [Member] | Agricultural [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	191	171
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	36	46
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, Past Due [Member] | Construction Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	0
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans	[1]	2,052	1,524
Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans		1,307,521	1,188,041
Financial Asset, Not Past Due [Member] | Agricultural [Member]
Financing Receivable, Past Due [Line Items]
Loans		43,290	64,159
Financial Asset, Not Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans		222,166	210,039
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans		37,569	39,762
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans		709,960	630,953
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Loans		16,477	14,736
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans		254,296	$ 228,392
Financial Asset, Not Past Due [Member] | Loans To Other Financial Institutions [Member]
Financing Receivable, Past Due [Line Items]
Loans		$ 23,763
[1] Includes nonaccrual loans.

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