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Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         $ 888,049 $ 799,611
Individually evaluated for impairment         25,034 17,693
Loans acquired with deteriorated credit quality         3,626 3,367
Collectively evaluated for impairment         859,389 778,551
Allowance for loan losses         9,979 8,886
Allowance for loan losses related to individually evaluated for impairment         457 487
Allowance for loan losses related to loans acquired with deteriorated credit quality         0 0
Allowance for loan losses related to collectively evaluated for impairment         9,522 8,399
Net loans         878,070 790,725
Net loans, individually evaluated for impairment         24,577 17,206
Net loans, loans acquired with deteriorated credit quality         3,626 3,367
Net loans, collectively evaluated for impairment         849,867 770,152
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         457 487
Collectively evaluated for impairment         9,522 8,399
Total $ 9,979 $ 7,275 $ 8,886 $ 7,106 9,979 8,886
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 9,405 7,275 8,886 7,106    
Charge-offs (65) (84) (184) (99)    
Recoveries 14 33 37 82    
Provision 625 135 1,240 270    
Balance at end of period 9,979 7,359 $ 9,979 7,359    
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         271,342 252,577
Individually evaluated for impairment         13,680 5,742
Loans acquired with deteriorated credit quality         1,989 1,969
Collectively evaluated for impairment         255,673 244,866
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         58 45
Collectively evaluated for impairment         3,483 3,544
Total 3,541 3,533 $ 3,541 3,376 3,541 3,589
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 3,665 3,533 3,589 3,376    
Charge-offs 0 0 (41) 0    
Recoveries 2 4 6 8    
Provision (126) (199) (13) (46)    
Balance at end of period 3,541 3,338 3,541 3,338    
Agricultural [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         188,547 123,624
Individually evaluated for impairment         3,728 3,346
Loans acquired with deteriorated credit quality         734 738
Collectively evaluated for impairment         184,085 119,540
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         95 54
Collectively evaluated for impairment         2,357 1,440
Total 2,452 405 1,494 409 2,452 1,494
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 1,952 405 1,494 409    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision 500 176 958 172    
Balance at end of period 2,452 581 2,452 581    
Residential Real Estate Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         205,725 207,423
Individually evaluated for impairment         1,254 957
Loans acquired with deteriorated credit quality         35 35
Collectively evaluated for impairment         204,436 206,431
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         77 32
Collectively evaluated for impairment         1,027 1,032
Total 1,104 966 1,064 905 1,104 1,064
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 1,042 966 1,064 905    
Charge-offs (48) (43) (93) (43)    
Recoveries 0 0 0 0    
Provision 110 67 133 128    
Balance at end of period 1,104 990 1,104 990    
Construction Real Estate Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         25,569 25,441
Individually evaluated for impairment         0 0
Loans acquired with deteriorated credit quality         0 0
Collectively evaluated for impairment         25,569 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         45 47
Total 45 14 45 24 45 47
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 46 14 47 24    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision (1) 4 (2) (6)    
Balance at end of period 45 18 45 18    
Consumer [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         10,603 11,005
Individually evaluated for impairment         4 0
Loans acquired with deteriorated credit quality         0 4
Collectively evaluated for impairment         10,599 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         123 122
Total 125 96 125 102 125 122
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 123 96 122 102    
Charge-offs (17) (23) (45) (38)    
Recoveries 12 29 22 68    
Provision 7 2 26 (28)    
Balance at end of period 125 104 125 104    
Other Commercial Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         56,952 58,639
Individually evaluated for impairment         4,902 5,994
Loans acquired with deteriorated credit quality         868 621
Collectively evaluated for impairment         51,182 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         207 326
Collectively evaluated for impairment         924 1,001
Total 1,131 1,222 1,327 1,183 1,131 1,327
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 1,215 1,222 1,327 1,183    
Charge-offs 0 (18) 0 (18)    
Recoveries 0 0 9 6    
Provision (84) 112 (205) 145    
Balance at end of period 1,131 1,316 1,131 1,316    
Other Agricultural Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         32,974 23,388
Individually evaluated for impairment         1,466 1,654
Loans acquired with deteriorated credit quality         0 0
Collectively evaluated for impairment         31,508 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         18 30
Collectively evaluated for impairment         413 282
Total 431 125 312 122 431 312
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 306 125 312 122    
Charge-offs 0 0 (5) 0    
Recoveries 0 0 0 0    
Provision 125 123 124 126    
Balance at end of period 431 248 431 248    
State and Political Subdivision Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables         96,337 97,514
Individually evaluated for impairment         0 0
Loans acquired with deteriorated credit quality         0 0
Collectively evaluated for impairment         96,337 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         838 833
Total 838 666 838 593 838 833
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 824 666 833 593    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision 14 98 5 171    
Balance at end of period 838 764 838 764    
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         312 98
Total 312 248 98 392 312 98
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance at beginning of period 232 248 98 392    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision 80 (248) 214 (392)    
Balance at end of period 312 0 312 0    
First National Bank of Fredericksburg [Member]            
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]            
Balance at beginning of period 275 551 389 637    
Accretion (108) (87) (222) (173)    
Balance at end of period $ 167 $ 464 $ 167 $ 464    
Loans acquired with specific evidence of deterioration in credit quality [Abstract]            
Outstanding balance         6,660 6,487
Carrying amount         $ 3,626 $ 3,367