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Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	$ 1,040,200		$ 1,040,200		$ 1,000,525
Individually evaluated for impairment	25,531		25,531		24,398
Loans acquired with deteriorated credit quality	2,526		2,526		2,638
Collectively evaluated for impairment	1,012,143		1,012,143		973,489
Allowance for loan losses	11,941		11,941		11,190
Allowance for loan losses related to individually evaluated for impairment	405		405		410
Allowance for loan losses related to loans acquired with deteriorated credit quality	0		0		0
Allowance for loan losses related to collectively evaluated for impairment	11,536		11,536		10,780
Net loans	1,028,259		1,028,259		989,335
Net loans, individually evaluated for impairment	25,126		25,126		23,988
Net loans, loans acquired with deteriorated credit quality	2,526		2,526		2,638
Net loans, collectively evaluated for impairment	1,000,607		$ 1,000,607		962,709
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	213,242		$ 213,242		214,479
Individually evaluated for impairment	1,131		1,131		1,065
Loans acquired with deteriorated credit quality	30		30		33
Collectively evaluated for impairment	212,081		212,081		213,381
Real Estate Loans [Member] | Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	309,571		309,571		308,084
Individually evaluated for impairment	13,791		13,791		13,864
Loans acquired with deteriorated credit quality	1,388		1,388		1,460
Collectively evaluated for impairment	294,392		294,392		292,760
Real Estate Loans [Member] | Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	262,691		262,691		239,957
Individually evaluated for impairment	5,204		5,204		3,901
Loans acquired with deteriorated credit quality	683		683		702
Collectively evaluated for impairment	256,804		256,804		235,354
Real Estate Loans [Member] | Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	27,901		27,901		13,502
Individually evaluated for impairment	0		0		0
Loans acquired with deteriorated credit quality	0		0		0
Collectively evaluated for impairment	27,901		27,901		13,502
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	9,740		9,740		9,944
Individually evaluated for impairment	0		0		8
Loans acquired with deteriorated credit quality	0		0		0
Collectively evaluated for impairment	9,740		9,740		9,936
Other Commercial Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	75,002		75,002		72,013
Individually evaluated for impairment	3,934		3,934		4,197
Loans acquired with deteriorated credit quality	425		425		443
Collectively evaluated for impairment	70,643		70,643		67,373
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	42,131		42,131		37,809
Individually evaluated for impairment	1,471		1,471		1,363
Loans acquired with deteriorated credit quality	0		0		0
Collectively evaluated for impairment	40,660		40,660		36,446
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	99,922		99,922		104,737
Individually evaluated for impairment	0		0		0
Loans acquired with deteriorated credit quality	0		0		0
Collectively evaluated for impairment	99,922		99,922		104,737
First National Bank of Fredericksburg [Member]
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]
Balance at beginning of period	82	$ 275	106	$ 389
Accretion	(23)	(108)	(47)	(222)
Balance at end of period	59	$ 167	59	$ 167
Loans acquired with specific evidence of deterioration in credit quality [Abstract]
Outstanding balance	5,262		5,262		5,295
Carrying amount	$ 2,526		$ 2,526		$ 2,638

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The balance of financing receivables that were acquired with deteriorated credit quality.

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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