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Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	$ 1,093,720		$ 1,115,569
Individually evaluated for impairment	19,731		19,672
Loans acquired with deteriorated credit quality (PCI)	1,248		1,282
Collectively evaluated for impairment	1,072,741		1,094,615
Less: allowance for loan losses	14,247		13,845
Individually evaluated for impairment	753		735
Less: allowance for loan losses related to loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	13,494		13,110
Net loans	1,079,473		1,101,724
Net loans, individually evaluated for impairment	18,978		18,937
Net loans, loans acquired with deteriorated credit quality	1,248		1,282
Net loans, collectively evaluated for impairment	$ 1,059,247		1,081,505
Minimum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Number of days past for loan to be considered impaired, Minimum	90 days
First Mortgage [Member] | Minimum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate	15 years
First Mortgage [Member] | Maximum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate	30 years
Second Mortgage [Member] | Maximum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate	15 years
Real Estate Loans [Member] | Residential [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	$ 216,179		217,088
Individually evaluated for impairment	1,220		1,166
Loans acquired with deteriorated credit quality (PCI)	23		23
Collectively evaluated for impairment	214,936		215,899
Individually evaluated for impairment	31		32
Collectively evaluated for impairment	1,123		1,082
Real Estate Loans [Member] | Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	338,490		342,023
Individually evaluated for impairment	11,480		11,537
Loans acquired with deteriorated credit quality (PCI)	1,195		1,210
Collectively evaluated for impairment	325,815		329,276
Individually evaluated for impairment	335		251
Collectively evaluated for impairment	4,394		4,298
Real Estate Loans [Member] | Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	300,606		311,464
Individually evaluated for impairment	3,893		3,782
Loans acquired with deteriorated credit quality (PCI)	0		0
Collectively evaluated for impairment	296,713		307,682
Individually evaluated for impairment	86		151
Collectively evaluated for impairment	4,792		4,871
Real Estate Loans [Member] | Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	17,926		15,519
Individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality (PCI)	0		0
Collectively evaluated for impairment	17,926		15,519
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	56		43
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	9,533		9,947
Individually evaluated for impairment	3		4
Loans acquired with deteriorated credit quality (PCI)	0		0
Collectively evaluated for impairment	9,530		9,943
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	117		112
Other Commercial Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	71,038		69,970
Individually evaluated for impairment	1,842		1,902
Loans acquired with deteriorated credit quality (PCI)	30		49
Collectively evaluated for impairment	69,166		68,019
Individually evaluated for impairment	148		147
Collectively evaluated for impairment	1,149		1,108
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	46,170		55,112
Individually evaluated for impairment	1,293		1,281
Loans acquired with deteriorated credit quality (PCI)	0		0
Collectively evaluated for impairment	44,877		53,831
Individually evaluated for impairment	153		154
Collectively evaluated for impairment	682		807
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	93,778		94,446
Individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality (PCI)	0		0
Collectively evaluated for impairment	93,778		94,446
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	558		536
First National Bank of Fredericksburg [Member]
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]
Balance at beginning of period	89	$ 104
Accretion	(1)	(2)
Balance at end of period	88	$ 102
Loans acquired with specific evidence of deterioration in credit quality [Abstract]
Outstanding balance	4,057		4,072
Carrying amount	$ 1,248		$ 1,282

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