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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 11, 2015
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total Loans |  |  | $ 554,105,000 |  | $ 695,031,000 |
Allowance for loan losses |  |  | 6,815,000 |  | 7,106,000 |
Allowance for loan losses related to individually evaluated for impairment |  |  | 98,000 |  | 355,000 |
Allowance for loan losses related to Loans Acquired With Deteriorated Credit Quality |  |  | 0 |  | 0 |
Allowance for loan losses related to collectively evaluated for impairment |  |  | 6,717,000 |  | 6,751,000 |
Net loans |  |  | 547,290,000 |  | 687,925,000 |
Net loans, individually evaluated for impairment |  |  | 8,724,000 |  | 11,929,000 |
Net loans, loans acquired with deteriorated credit quality |  |  | 0 |  | 3,818,000 |
Net loans, collectively evaluated for impairment |  |  | 538,566,000 |  | 672,178,000 |
Loans acquired with deteriorated credit quality |  |  | 0 |  | 3,818,000 |
Individually evaluated for impairment |  |  | 8,822,000 |  | 12,284,000 |
Collectively evaluated for impairment |  |  | 545,283,000 |  | 678,929,000 |
Real estate loans serviced for Freddie Mac and Fannie Mae |  |  | 84,676,000 |  | 133,210,000 |
Real estate loans sold to Freddie Mac and Fannie Mae without recourse |  | $ 92,773,000 | 84,676,000 |  |  |
Portfolio balance under MPF |  |  |  |  | 40,437,000 |
First-loss position for MPF maintained by FHLB |  |  |  |  | 104,000 |
Credit enhancement for MPF by FHLB |  | $ 4,345,000 |  |  |  |
Net unamortized loan fees and costs |  |  | 1,173,000 |  | 1,170,000 |
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 |  | $ 6,815,000 | 7,098,000 | $ 6,784,000 |  |
Charge-offs |  | (238,000) | (910,000) | (134,000) |  |
Recoveries |  | 49,000 | 42,000 | 43,000 |  |
Provision |  | 480,000 | 585,000 | 405,000 |  |
Balance at end of period | $ 7,106,000 | $ 7,106,000 | 6,815,000 | 7,098,000 |  |
Individually evaluated for impairment |  |  | 98,000 | 333,000 | 355,000 |
Collectively evaluated for impairment |  |  | 6,717,000 | 6,765,000 | 6,751,000 |
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 |  |  |  |
Residential Real Estate Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total Loans |  |  | 185,438,000 |  | 203,407,000 |
Loans acquired with deteriorated credit quality |  |  | 0 |  | 35,000 |
Individually evaluated for impairment |  |  | 316,000 |  | 304,000 |
Collectively evaluated for impairment |  |  | 185,122,000 |  | 203,068,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | $ 878,000 | 946,000 | 875,000 |  |
Charge-offs |  | (66,000) | (97,000) | (17,000) |  |
Recoveries |  | 0 | 0 | 5,000 |  |
Provision |  | 93,000 | 29,000 | 83,000 |  |
Balance at end of period | 905,000 | 905,000 | 878,000 | 946,000 |  |
Individually evaluated for impairment |  |  | 25,000 | 27,000 | 37,000 |
Collectively evaluated for impairment |  |  | 853,000 | 919,000 | 868,000 |
Commercial and Agricultural Real Estate Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total Loans |  |  | 215,584,000 |  | 295,364,000 |
Loans acquired with deteriorated credit quality |  |  | 0 |  | 2,908,000 |
Individually evaluated for impairment |  |  | 6,112,000 |  | 6,235,000 |
Collectively evaluated for impairment |  |  | 209,472,000 |  | 286,221,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 3,870,000 | 4,558,000 | 4,437,000 |  |
Charge-offs |  | (84,000) | (516,000) | (62,000) |  |
Recoveries |  | 14,000 | 15,000 | 5,000 |  |
Provision |  | (15,000) | (187,000) | 178,000 |  |
Balance at end of period | 3,785,000 | 3,785,000 | 3,870,000 | 4,558,000 |  |
Individually evaluated for impairment |  |  | 72,000 | 305,000 | 62,000 |
Collectively evaluated for impairment |  |  | 3,798,000 | 4,253,000 | 3,723,000 |
Change in loan portfolio |  | (11,168,000) | (187,000) |  |  |
Construction [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total Loans |  |  | 6,353,000 |  | 15,011,000 |
Loans acquired with deteriorated credit quality |  |  | 0 |  | 0 |
Individually evaluated for impairment |  |  | 0 |  | 0 |
Collectively evaluated for impairment |  |  | 6,353,000 |  | 15,011,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 26,000 | 50,000 | 38,000 |  |
Charge-offs |  | 0 | 0 | 0 |  |
Recoveries |  | 0 | 0 | 0 |  |
Provision |  | (2,000) | (24,000) | 12,000 |  |
Balance at end of period | 24,000 | 24,000 | 26,000 | 50,000 |  |
Individually evaluated for impairment |  |  | 0 | 0 | 0 |
Collectively evaluated for impairment |  |  | 26,000 | 50,000 | 24,000 |
Consumer [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total Loans |  |  | 8,497,000 |  | 11,543,000 |
Loans acquired with deteriorated credit quality |  |  | 0 |  | 9,000 |
Individually evaluated for impairment |  |  | 0 |  | 0 |
Collectively evaluated for impairment |  |  | 8,497,000 |  | 11,534,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 84,000 | 105,000 | 119,000 |  |
Charge-offs |  | (47,000) | (47,000) | (54,000) |  |
Recoveries |  | 33,000 | 27,000 | 33,000 |  |
Provision |  | 32,000 | (1,000) | 7,000 |  |
Balance at end of period | 102,000 | 102,000 | 84,000 | 105,000 |  |
Individually evaluated for impairment |  |  | 0 | 0 | 0 |
Collectively evaluated for impairment |  |  | 84,000 | 105,000 | 102,000 |
Other Commercial and Agricultural Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total Loans |  |  | 58,516,000 |  | 71,206,000 |
Loans acquired with deteriorated credit quality |  |  | 0 |  | 866,000 |
Individually evaluated for impairment |  |  | 2,394,000 |  | 5,745,000 |
Collectively evaluated for impairment |  |  | 56,122,000 |  | 64,595,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 1,224,000 | 942,000 | 728,000 |  |
Charge-offs |  | (41,000) | (250,000) | (1,000) |  |
Recoveries |  | 2,000 | 0 | 0 |  |
Provision |  | 120,000 | 532,000 | 215,000 |  |
Balance at end of period | 1,305,000 | 1,305,000 | 1,224,000 | 942,000 |  |
Individually evaluated for impairment |  |  | 1,000 | 1,000 | 256,000 |
Collectively evaluated for impairment |  |  | 1,223,000 | 941,000 | 1,049,000 |
State and Political Subdivision Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total Loans |  |  | 79,717,000 |  | 98,500,000 |
Loans acquired with deteriorated credit quality |  |  | 0 |  | 0 |
Individually evaluated for impairment |  |  | 0 |  | 0 |
Collectively evaluated for impairment |  |  | 79,717,000 |  | 98,500,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 545,000 | 330,000 | 271,000 |  |
Charge-offs |  | 0 | 0 | 0 |  |
Recoveries |  | 0 | 0 | 0 |  |
Provision |  | 48,000 | 215,000 | 59,000 |  |
Balance at end of period | 593,000 | 593,000 | 545,000 | 330,000 |  |
Individually evaluated for impairment |  |  | 0 | 0 | 0 |
Collectively evaluated for impairment |  |  | 545,000 | 330,000 | 593,000 |
Unallocated [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 188,000 | 167,000 | 316,000 |  |
Charge-offs |  | 0 | 0 | 0 |  |
Recoveries |  | 0 | 0 | 0 |  |
Provision |  | 204,000 | 21,000 | (149,000) |  |
Balance at end of period | 392,000 | 392,000 | 188,000 | 167,000 |  |
Individually evaluated for impairment |  |  | 0 | 0 | 0 |
Collectively evaluated for impairment |  |  | $ 188,000 | $ 167,000 | 392,000 |
First National Bank of Fredericksburg [Member] |  |  |  |  |  |
Components of the purchase accounting adjustments related to the purchased impaired loans in FNB Acquisition [Abstract] |  |  |  |  |  |
Contractually required principal and interest at acquisition |  |  |  |  |  | $ 9,913,000
Non-accretable discount |  |  |  |  |  | (5,439,000)
Expected cash flows |  |  |  |  |  | 4,474,000
Accretable discount | (665,000) | (637,000) |  |  | (637,000) | (665,000)
Estimated fair value |  |  |  |  |  | 3,809,000
Changes in the amortizable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 665,000 |  |  |  |  |
Accretion | (28,000) |  |  |  |  |
Balance at end of period | $ 637,000 | $ 637,000 |  |  |  |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |  |
Outstanding balance |  |  |  |  | 6,950,000 | 6,969,000
Carrying amount |  |  |  |  | $ 3,818,000 | $ 3,809,000

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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