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Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	$ 1,031,738		$ 1,000,525
Individually evaluated for impairment	24,520		24,398
Loans acquired with deteriorated credit quality	2,584		2,638
Collectively evaluated for impairment	1,004,634		973,489
Allowance for loan losses	11,587		11,190
Allowance for loan losses related to individually evaluated for impairment	408		410
Allowance for loan losses related to loans acquired with deteriorated credit quality	0		0
Allowance for loan losses related to collectively evaluated for impairment	11,179		10,780
Net loans	1,020,151		989,335
Net loans, individually evaluated for impairment	24,112		23,988
Net loans, loans acquired with deteriorated credit quality	2,584		2,638
Net loans, collectively evaluated for impairment	$ 993,455		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	$ 215,349		214,479
Individually evaluated for impairment	1,234		1,065
Loans acquired with deteriorated credit quality	31		33
Collectively evaluated for impairment	214,084		213,381
Real Estate Loans [Member] | Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	320,381		308,084
Individually evaluated for impairment	13,949		13,864
Loans acquired with deteriorated credit quality	1,422		1,460
Collectively evaluated for impairment	305,010		292,760
Real Estate Loans [Member] | Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	248,710		239,957
Individually evaluated for impairment	3,818		3,901
Loans acquired with deteriorated credit quality	689		702
Collectively evaluated for impairment	244,203		235,354
Real Estate Loans [Member] | Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	22,239		13,502
Individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	22,239		13,502
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	9,672		9,944
Individually evaluated for impairment	0		8
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	9,672		9,936
Other Commercial Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	74,930		72,013
Individually evaluated for impairment	4,139		4,197
Loans acquired with deteriorated credit quality	442		443
Collectively evaluated for impairment	70,349		67,373
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	40,396		37,809
Individually evaluated for impairment	1,380		1,363
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	39,016		36,446
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	100,061		104,737
Individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	100,061		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	106	$ 389
Accretion	(24)	(114)
Balance at end of period	82	$ 275
Loans acquired with specific evidence of deterioration in credit quality [Abstract]
Outstanding balance	5,284		5,295
Carrying amount	$ 2,584		$ 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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