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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 11, 2015 | Dec. 31, 2014
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | $ 799,611 | $ 695,031 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 17,693 | 12,284 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 3,367 | 3,818 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 778,551 | 678,929 |  |
Less: Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  | 8,886 | 7,106 |  |
Allowance for loan losses related to individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 487 | 355 |  |
Allowance for loan losses related to loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Allowance for loan losses related to collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 8,399 | 6,751 |  |
Net loans |  |  |  |  |  |  |  |  |  |  |  | 790,725 | 687,925 |  |
Net loans, individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 17,206 | 11,929 |  |
Net loans, loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 3,367 | 3,818 |  |
Net loans, collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 770,152 | 672,178 |  |
Real estate loans serviced for Freddie Mac and Fannie Mae |  |  |  |  |  |  |  |  |  |  |  | 135,404 | 133,210 |  |
Real estate loans sold to Freddie Mac and Fannie Mae without recourse |  |  |  |  |  |  |  |  | $ 102,444 | $ 92,773 |  |  |  |  |
Portfolio balance under MPF |  |  |  |  |  |  |  |  |  |  |  | 32,960 | 40,437 |  |
First-loss position for MPF maintained by FHLB |  |  |  |  |  |  |  |  |  |  |  | 120 |  |  |
Credit enhancement for MPF by FHLB |  |  |  |  |  |  |  |  | $ 985 |  |  |  |  |  |
Net unamortized loan fees and costs |  |  |  |  |  |  |  |  |  |  |  | 732 | 1,170 |  |
Number of days past for loan to be considered impaired, Minimum |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 7,106 |  |  |  | $ 6,815 | $ 7,106 | 6,815 | $ 7,098 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (340) | (238) | (910) |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 600 | 49 | 42 |  |  |  |
Provision | $ 750 | $ 500 | $ 135 | 135 | $ 120 | $ 120 | $ 120 | 120 | 1,520 | 480 | 585 |  |  |  |
Balance at end of period | 8,886 |  |  |  | 7,106 |  |  |  | $ 8,886 | 7,106 | 6,815 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 487 | 355 |  | $ 98
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 8,399 | 6,751 |  | 6,717
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 |  |  |  |  |  |  |  |  |  |  |  | 252,577 | 237,542 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 5,742 | 6,068 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 1,969 | 2,170 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 244,866 | 229,304 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 3,376 |  |  |  | 3,419 | $ 3,376 | 3,419 | 3,983 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (100) | (84) | (516) |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 479 | 14 | 15 |  |  |  |
Provision |  |  |  |  |  |  |  |  | (166) | 27 | (63) |  |  |  |
Balance at end of period | 3,589 |  |  |  | 3,376 |  |  |  | 3,589 | 3,376 | 3,419 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 45 | 62 |  | 72
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 3,544 | 3,314 |  | 3,347
Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | 123,624 | 57,822 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 3,346 | 167 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 738 | 738 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 119,540 | 56,917 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 409 |  |  |  | 451 | 409 | 451 | 575 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Provision |  |  |  |  |  |  |  |  | 1,085 | (42) | (124) |  |  |  |
Balance at end of period | 1,494 |  |  |  | 409 |  |  |  | 1,494 | 409 | 451 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 54 | 0 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,440 | 409 |  | 451
Residential Real Estate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | 207,423 | 203,407 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 957 | 304 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 35 | 35 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 206,431 | 203,068 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 905 |  |  |  | 878 | 905 | 878 | 946 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (85) | (66) | (97) |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Provision |  |  |  |  |  |  |  |  | 244 | 93 | 29 |  |  |  |
Balance at end of period | 1,064 |  |  |  | 905 |  |  |  | 1,064 | 905 | 878 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 32 | 37 |  | 25
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,032 | 868 |  | 853
Construction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | 25,441 | 15,011 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 25,441 | 15,011 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 24 |  |  |  | 26 | 24 | 26 | 50 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Provision |  |  |  |  |  |  |  |  | 23 | (2) | (24) |  |  |  |
Balance at end of period | 47 |  |  |  | 24 |  |  |  | 47 | 24 | 26 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 47 | 24 |  | 26
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | 11,005 | 11,543 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 4 | 9 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 11,001 | 11,534 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 102 |  |  |  | 84 | 102 | 84 | 105 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (100) | (47) | (47) |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 88 | 33 | 27 |  |  |  |
Provision |  |  |  |  |  |  |  |  | 32 | 32 | (1) |  |  |  |
Balance at end of period | 122 |  |  |  | 102 |  |  |  | 122 | 102 | 84 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 122 | 102 |  | 84
Other Commercial Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | 58,639 | 57,549 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 5,994 | 5,640 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 621 | 866 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 52,024 | 51,043 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1,183 |  |  |  | 1,007 | 1,183 | 1,007 | 686 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (55) | (41) | (250) |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 33 | 2 | 0 |  |  |  |
Provision |  |  |  |  |  |  |  |  | 166 | 215 | 571 |  |  |  |
Balance at end of period | 1,327 |  |  |  | 1,183 |  |  |  | 1,327 | 1,183 | 1,007 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 326 | 256 |  | 1
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,001 | 927 |  | 1,006
Other Agricultural Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | 23,388 | 13,657 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,654 | 105 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 21,734 | 13,552 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 122 |  |  |  | 217 | 122 | 217 | 256 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Provision |  |  |  |  |  |  |  |  | 190 | (95) | (39) |  |  |  |
Balance at end of period | 312 |  |  |  | 122 |  |  |  | 312 | 122 | 217 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 282 | 122 |  | 217
State and Political Subdivision Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total financing receivables |  |  |  |  |  |  |  |  |  |  |  | 97,514 | 98,500 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 97,514 | 98,500 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 593 |  |  |  | 545 | 593 | 545 | 330 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Provision |  |  |  |  |  |  |  |  | 240 | 48 | 215 |  |  |  |
Balance at end of period | 833 |  |  |  | 593 |  |  |  | 833 | 593 | 545 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 833 | 593 |  | 545
Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 392 |  |  |  | 188 | 392 | 188 | 167 |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Provision |  |  |  |  |  |  |  |  | (294) | 204 | 21 |  |  |  |
Balance at end of period | 98 |  |  |  | 392 |  |  |  | 98 | 392 | 188 |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 98 | 392 |  | 188
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 |  |  | 637 | 637 |  |  | 665 | 637 | 665 | 665 | 389 | 637 | 665 | $ 665
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 637 |  |  |  | $ 665 | 637 | 665 |  |  |  |  |
Accretion |  |  |  |  |  |  |  |  | (349) | (28) |  |  |  |  |
Reclassification of non-accretable discount |  |  |  |  |  |  |  |  | 101 | 0 |  |  |  |  |
Balance at end of period | $ 389 |  |  |  | $ 637 |  |  |  | $ 389 | $ 637 | $ 665 |  |  |  |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  |  |  |  |  |  | 6,487 | 6,950 | $ 6,969 |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  | $ 3,367 | $ 3,818 |  |

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- Definition Amount of credit enhancement for Mortgage Partnership Finance Program Portfolio losses by Federal Home Loan Bank. + References No definition available. + Details
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- Definition Amount of first loss position maintained by Federal Home Loan Bank under Mortgage Partnership Finance Program. + References No definition available. + Details
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- Definition The balance of financing receivables that were acquired with deteriorated credit quality. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements, related to Individually evaluated for impairment, related to Collectively evaluated for impairment. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements, related to Individually evaluated for impairment. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements, related to loans acquired with deteriorated credit quality. + References No definition available. + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. Related to Collectively evaluated for impairment. + References No definition available. + Details
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