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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | $ 1,060,331 |  | $ 1,060,331 |  | $ 1,000,525
Individually evaluated for impairment | 24,917 |  | 24,917 |  | 24,398
Loans acquired with deteriorated credit quality | 2,576 |  | 2,576 |  | 2,638
Collectively evaluated for impairment | 1,032,838 |  | 1,032,838 |  | 973,489
Allowance for loan losses | 12,383 |  | 12,383 |  | 11,190
Individually evaluated for impairment | 654 |  | 654 |  | 410
Allowance for loan losses related to loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 11,729 |  | 11,729 |  | 10,780
Net loans | 1,047,948 |  | 1,047,948 |  | 989,335
Net loans, individually evaluated for impairment | 24,263 |  | 24,263 |  | 23,988
Net loans, loans acquired with deteriorated credit quality | 2,576 |  | 2,576 |  | 2,638
Net loans, collectively evaluated for impairment | 1,021,109 |  | $ 1,021,109 |  | 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 | 213,255 |  | $ 213,255 |  | 214,479
Individually evaluated for impairment | 915 |  | 915 |  | 1,065
Loans acquired with deteriorated credit quality | 30 |  | 30 |  | 33
Collectively evaluated for impairment | 212,310 |  | 212,310 |  | 213,381
Individually evaluated for impairment | 27 |  | 27 |  | 56
Collectively evaluated for impairment | 1,025 |  | 1,025 |  | 993
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 312,982 |  | 312,982 |  | 308,084
Individually evaluated for impairment | 14,148 |  | 14,148 |  | 13,864
Loans acquired with deteriorated credit quality | 1,345 |  | 1,345 |  | 1,460
Collectively evaluated for impairment | 297,489 |  | 297,489 |  | 292,760
Individually evaluated for impairment | 224 |  | 224 |  | 94
Collectively evaluated for impairment | 3,701 |  | 3,701 |  | 3,773
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 280,569 |  | 280,569 |  | 239,957
Individually evaluated for impairment | 5,038 |  | 5,038 |  | 3,901
Loans acquired with deteriorated credit quality | 683 |  | 683 |  | 702
Collectively evaluated for impairment | 274,848 |  | 274,848 |  | 235,354
Individually evaluated for impairment | 86 |  | 86 |  | 3
Collectively evaluated for impairment | 3,843 |  | 3,843 |  | 3,140
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 30,262 |  | 30,262 |  | 13,502
Individually evaluated for impairment | 0 |  | 0 |  | 0
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 30,262 |  | 30,262 |  | 13,502
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 49 |  | 49 |  | 23
Consumer [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 9,702 |  | 9,702 |  | 9,944
Individually evaluated for impairment | 0 |  | 0 |  | 8
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 9,702 |  | 9,702 |  | 9,936
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 123 |  | 123 |  | 124
Other Commercial Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 72,219 |  | 72,219 |  | 72,013
Individually evaluated for impairment | 3,368 |  | 3,368 |  | 4,197
Loans acquired with deteriorated credit quality | 518 |  | 518 |  | 443
Collectively evaluated for impairment | 68,333 |  | 68,333 |  | 67,373
Individually evaluated for impairment | 152 |  | 152 |  | 231
Collectively evaluated for impairment | 1,067 |  | 1,067 |  | 1,041
Other Agricultural Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 39,917 |  | 39,917 |  | 37,809
Individually evaluated for impairment | 1,448 |  | 1,448 |  | 1,363
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 38,469 |  | 38,469 |  | 36,446
Individually evaluated for impairment | 165 |  | 165 |  | 26
Collectively evaluated for impairment | 534 |  | 534 |  | 466
State and Political Subdivision Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables | 101,425 |  | 101,425 |  | 104,737
Individually evaluated for impairment | 0 |  | 0 |  | 0
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 101,425 |  | 101,425 |  | 104,737
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 751 |  | 751 |  | 816
First National Bank of Fredericksburg [Member] |  |  |  |  |
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |
Balance at beginning of period | 59 | $ 167 | 106 | $ 389 |
Accretion | (24) | (90) | (71) | (312) |
Reclassification of non-accretable discount | 93 | 0 | 93 | 0 |
Balance at end of period | 128 | $ 77 | 128 | $ 77 |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |
Outstanding balance | 5,340 |  | 5,340 |  | 5,295
Carrying amount | $ 2,576 |  | $ 2,576 |  | $ 2,638

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