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Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     $ 845,307 $ 799,611
Individually evaluated for impairment     17,663 17,693
Loans acquired with deteriorated credit quality     3,601 3,367
Collectively evaluated for impairment     824,043 778,551
Allowance for loan losses     9,405 8,886
Allowance for loan losses related to individually evaluated for impairment     404 487
Allowance for loan losses related to loans acquired with deteriorated credit quality     0 0
Allowance for loan losses related to collectively evaluated for impairment     9,001 8,399
Net loans     835,902 790,725
Net loans, individually evaluated for impairment     17,259 17,206
Net loans, loans acquired with deteriorated credit quality     3,601 3,367
Net loans, collectively evaluated for impairment     815,042 770,152
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     404 487
Collectively evaluated for impairment     9,001 8,399
Total $ 8,886 $ 7,106 9,405 8,886
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 8,886 7,106    
Charge-offs (119) (15)    
Recoveries 23 49    
Provision 615 135    
Balance at end of period $ 9,405 7,275    
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      
Commercial [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     267,097 252,577
Individually evaluated for impairment     6,347 5,742
Loans acquired with deteriorated credit quality     1,965 1,969
Collectively evaluated for impairment     258,785 244,866
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     47 45
Collectively evaluated for impairment     3,618 3,544
Total $ 3,665 3,376 3,665 3,589
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 3,589 3,376    
Charge-offs (41) 0    
Recoveries 4 4    
Provision 113 153    
Balance at end of period 3,665 3,533    
Agricultural [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     156,299 123,624
Individually evaluated for impairment     3,476 3,346
Loans acquired with deteriorated credit quality     737 738
Collectively evaluated for impairment     152,086 119,540
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     103 54
Collectively evaluated for impairment     1,849 1,440
Total 1,952 409 1,952 1,494
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,494 409    
Charge-offs 0 0    
Recoveries 0 0    
Provision 458 (4)    
Balance at end of period 1,952 405    
Residential Real Estate Loans [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     203,817 207,423
Individually evaluated for impairment     945 957
Loans acquired with deteriorated credit quality     35 35
Collectively evaluated for impairment     202,837 206,431
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     38 32
Collectively evaluated for impairment     1,004 1,032
Total 1,042 905 1,042 1,064
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,064 905    
Charge-offs (45) 0    
Recoveries 0 0    
Provision 23 61    
Balance at end of period 1,042 966    
Construction Real Estate Loans [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     26,118 25,441
Individually evaluated for impairment     0 0
Loans acquired with deteriorated credit quality     0 0
Collectively evaluated for impairment     26,118 25,441
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     0 0
Collectively evaluated for impairment     46 47
Total 47 24 46 47
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 47 24    
Charge-offs 0 0    
Recoveries 0 0    
Provision (1) (10)    
Balance at end of period 46 14    
Consumer [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     10,508 11,005
Individually evaluated for impairment     2 0
Loans acquired with deteriorated credit quality     1 4
Collectively evaluated for impairment     10,505 11,001
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     2 0
Collectively evaluated for impairment     121 122
Total 123 102 123 122
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 122 102    
Charge-offs (28) (15)    
Recoveries 10 39    
Provision 19 (30)    
Balance at end of period 123 96    
Other Commercial Loans [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     59,800 58,639
Individually evaluated for impairment     5,281 5,994
Loans acquired with deteriorated credit quality     863 621
Collectively evaluated for impairment     53,656 52,024
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     195 326
Collectively evaluated for impairment     1,020 1,001
Total 1,215 1,183 1,215 1,327
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,327 1,183    
Charge-offs 0 0    
Recoveries 9 6    
Provision (121) 33    
Balance at end of period 1,215 1,222    
Other Agricultural Loans [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     24,227 23,388
Individually evaluated for impairment     1,612 1,654
Loans acquired with deteriorated credit quality     0 0
Collectively evaluated for impairment     22,615 21,734
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     19 30
Collectively evaluated for impairment     287 282
Total 312 122 306 312
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 312 122    
Charge-offs (5) 0    
Recoveries 0 0    
Provision (1) 3    
Balance at end of period 306 125    
State and Political Subdivision Loans [Member]        
Segments of loan portfolio and allowance for loan losses [Abstract]        
Total financing receivables     97,441 97,514
Individually evaluated for impairment     0 0
Loans acquired with deteriorated credit quality     0 0
Collectively evaluated for impairment     97,441 97,514
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     0 0
Collectively evaluated for impairment     824 833
Total 833 593 824 833
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 833 593    
Charge-offs 0 0    
Recoveries 0 0    
Provision (9) 73    
Balance at end of period 824 666    
Unallocated [Member]        
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]        
Individually evaluated for impairment     0 0
Collectively evaluated for impairment     232 98
Total 232 392 232 98
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 98 392    
Charge-offs 0 0    
Recoveries 0 0    
Provision 134 (144)    
Balance at end of period 232 248    
First National Bank of Fredericksburg [Member]        
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]        
Balance at beginning of period 389 637    
Accretion (114) (86)    
Balance at end of period $ 275 $ 551    
Loans acquired with specific evidence of deterioration in credit quality [Abstract]        
Outstanding balance     6,688 6,487
Carrying amount     $ 3,601 $ 3,367