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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 11, 2015
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | $ 1,000,525 | $ 799,611 |
Individually evaluated for impairment |  |  | 24,398 | 17,693 |
Loans acquired with deteriorated credit quality |  |  | 2,638 | 3,367 |
Collectively evaluated for impairment |  |  | 973,489 | 778,551 |
Allowance for loan losses |  |  | 11,190 | 8,886 |
Allowance for loan losses related to individually evaluated for impairment |  |  | 410 | 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 |  |  | 10,780 | 8,399 |
Net loans |  |  | 989,335 | 790,725 |
Net loans, individually evaluated for impairment |  |  | 23,988 | 17,206 |
Net loans, loans acquired with deteriorated credit quality |  |  | 2,638 | 3,367 |
Net loans, collectively evaluated for impairment |  |  | 962,709 | 770,152 |
Net unamortized loan fees and costs |  |  | 794 | 732 |
Real estate loans serviced for Freddie Mac and Fannie Mae |  |  | 142,972 | 135,404 |
Real estate loans sold to Freddie Mac and Fannie Mae without recourse | $ 114,643 | $ 102,444 |  |  |
Portfolio balance under MPF |  |  | 28,329 | 32,960 |
First-loss position for MPF maintained by FHLB |  |  | 123 |  |
Credit enhancement for MPF by FHLB | $ 980 |  |  |  |
Number of days past for loan to be considered impaired, Minimum | 90 days |  |  |  |
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 |  |  | 214,479 | 207,423 |
Individually evaluated for impairment |  |  | 1,065 | 957 |
Loans acquired with deteriorated credit quality |  |  | 33 | 35 |
Collectively evaluated for impairment |  |  | 213,381 | 206,431 |
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 308,084 | 252,577 |
Individually evaluated for impairment |  |  | 13,864 | 5,742 |
Loans acquired with deteriorated credit quality |  |  | 1,460 | 1,969 |
Collectively evaluated for impairment |  |  | 292,760 | 244,866 |
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 239,957 | 123,624 |
Individually evaluated for impairment |  |  | 3,901 | 3,347 |
Loans acquired with deteriorated credit quality |  |  | 702 | 738 |
Collectively evaluated for impairment |  |  | 235,354 | 119,539 |
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 13,502 | 25,441 |
Individually evaluated for impairment |  |  | 0 | 0 |
Loans acquired with deteriorated credit quality |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 13,502 | 25,441 |
Consumer [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 9,944 | 11,005 |
Individually evaluated for impairment |  |  | 8 | 0 |
Loans acquired with deteriorated credit quality |  |  | 0 | 4 |
Collectively evaluated for impairment |  |  | 9,936 | 11,001 |
Other Commercial Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 72,013 | 58,639 |
Individually evaluated for impairment |  |  | 4,197 | 5,994 |
Loans acquired with deteriorated credit quality |  |  | 443 | 621 |
Collectively evaluated for impairment |  |  | 67,373 | 52,024 |
Other Agricultural Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 37,809 | 23,388 |
Individually evaluated for impairment |  |  | 1,363 | 1,653 |
Loans acquired with deteriorated credit quality |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 36,446 | 21,735 |
State and Political Subdivision Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 104,737 | 97,514 |
Individually evaluated for impairment |  |  | 0 | 0 |
Loans acquired with deteriorated credit quality |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 104,737 | 97,514 |
First National Bank of Fredericksburg [Member] |  |  |  |  |
Components of the purchase accounting adjustments related to the purchased impaired loans in FNB Acquisition [Abstract] |  |  |  |  |
Estimated fair value |  |  |  |  | $ 3,809
Contractually required principal and interest at acquisition |  |  |  |  | 9,913
Expected cash flows |  |  |  |  | 4,474
Non-accretable discount |  |  |  |  | 5,439
Accretable discount | $ 389 | 389 | 106 | 389 | 665
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |
Balance at beginning of period | 389 | 637 |  |  |
Accretion | (632) | (349) |  |  |
Reclassification of non-accretable discount | 349 | 101 |  |  |
Balance at end of period | $ 106 | $ 389 |  |  |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |
Outstanding balance |  |  | 5,295 | 6,487 | $ 6,969
Carrying amount |  |  | $ 2,638 | $ 3,367 |

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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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