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Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | $ 1,115,034 |  | $ 1,115,034 |  | $ 1,081,883
Individually evaluated for impairment | 21,352 |  | 21,352 |  | 23,450
Loans acquired with deteriorated credit quality | 1,328 |  | 1,328 |  | 1,859
Collectively evaluated for impairment | 1,092,354 |  | 1,092,354 |  | 1,056,574
Allowance for loan losses | 13,679 |  | 13,679 |  | 12,884
Individually evaluated for impairment | 810 |  | 810 |  | 676
Allowance for loan losses related to loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 12,869 |  | 12,869 |  | 12,208
Net loans | 1,101,355 |  | 1,101,355 |  | 1,068,999
Net loans, individually evaluated for impairment | 20,542 |  | 20,542 |  | 22,774
Net loans, loans acquired with deteriorated credit quality | 1,328 |  | 1,328 |  | 1,859
Net loans, collectively evaluated for impairment | 1,079,485 |  | $ 1,079,485 |  | 1,044,366
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 | 215,717 |  | $ 215,717 |  | 215,305
Individually evaluated for impairment | 1,195 |  | 1,195 |  | 890
Loans acquired with deteriorated credit quality | 24 |  | 24 |  | 28
Collectively evaluated for impairment | 214,498 |  | 214,498 |  | 214,387
Individually evaluated for impairment | 22 |  | 22 |  | 24
Collectively evaluated for impairment | 1,069 |  | 1,069 |  | 1,081
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 349,269 |  | 349,269 |  | 319,265
Individually evaluated for impairment | 11,921 |  | 11,921 |  | 13,327
Loans acquired with deteriorated credit quality | 1,213 |  | 1,213 |  | 1,321
Collectively evaluated for impairment | 336,135 |  | 336,135 |  | 304,617
Individually evaluated for impairment | 342 |  | 342 |  | 216
Collectively evaluated for impairment | 4,299 |  | 4,299 |  | 3,899
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 305,948 |  | 305,948 |  | 284,520
Individually evaluated for impairment | 4,781 |  | 4,781 |  | 5,592
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 301,167 |  | 301,167 |  | 278,928
Individually evaluated for impairment | 145 |  | 145 |  | 84
Collectively evaluated for impairment | 4,567 |  | 4,567 |  | 4,180
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 11,448 |  | 11,448 |  | 33,913
Individually evaluated for impairment | 0 |  | 0 |  | 0
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 11,448 |  | 11,448 |  | 33,913
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 19 |  | 19 |  | 58
Consumer [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 9,709 |  | 9,709 |  | 9,858
Individually evaluated for impairment | 6 |  | 6 |  | 0
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 9,703 |  | 9,703 |  | 9,858
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 119 |  | 119 |  | 120
Other Commercial Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 76,785 |  | 76,785 |  | 74,118
Individually evaluated for impairment | 2,042 |  | 2,042 |  | 2,206
Loans acquired with deteriorated credit quality | 91 |  | 91 |  | 510
Collectively evaluated for impairment | 74,652 |  | 74,652 |  | 71,402
Individually evaluated for impairment | 144 |  | 144 |  | 193
Collectively evaluated for impairment | 1,205 |  | 1,205 |  | 1,161
Other Agricultural Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 50,334 |  | 50,334 |  | 42,186
Individually evaluated for impairment | 1,407 |  | 1,407 |  | 1,435
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 48,927 |  | 48,927 |  | 40,751
Individually evaluated for impairment | 157 |  | 157 |  | 159
Collectively evaluated for impairment | 712 |  | 712 |  | 593
State and Political Subdivision Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 95,824 |  | 95,824 |  | 102,718
Individually evaluated for impairment | 0 |  | 0 |  | 0
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 95,824 |  | 95,824 |  | 102,718
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 536 |  | 536 |  | 762
First National Bank of Fredericksburg [Member] |  |  |  |  |
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |
Balance at beginning of period | 100 | $ 59 | 104 | $ 106 |
Accretion | (10) | (24) | (14) | (71) |
Reclassification of non-accretable discount | 0 | 93 | 0 | 93 |
Balance at end of period | 90 | $ 128 | 90 | $ 128 |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |
Outstanding balance | 4,076 |  | 4,076 |  | 4,529
Carrying amount | $ 1,328 |  | $ 1,328 |  | $ 1,859

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