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Loans (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 11, 2015
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | $ 699,703,000 | $ 695,031,000 |
Individually evaluated for impairment |  |  | 13,238,000 | 12,284,000 |
Loans acquired with deteriorated credit quality |  |  | 3,483,000 | 3,818,000 |
Collectively evaluated for impairment |  |  | 682,982,000 | 678,929,000 |
Allowance for loan losses |  |  | 7,275,000 | 7,106,000 |
Allowance for loan losses related to individually evaluated for impairment |  |  | 475,000 | 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 |  |  | 6,800,000 | 6,751,000 |
Net loans |  |  | 692,428,000 | 687,925,000 |
Net loans, individually evaluated for impairment |  |  | 12,763,000 | 11,929,000 |
Net loans, loans acquired with deteriorated credit quality |  |  | 3,483,000 | 3,818,000 |
Net loans, collectively evaluated for impairment |  |  | 676,182,000 | 672,178,000 |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 475,000 | 355,000 |
Collectively evaluated for impairment |  |  | 6,800,000 | 6,751,000 |
Total | $ 7,275,000 | $ 6,815,000 | 7,275,000 | 7,106,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 7,106,000 | 6,815,000 |  |  |
Charge-offs | (15,000) | (25,000) |  |  |
Recoveries | 49,000 | 12,000 |  |  |
Provision | 135,000 | 120,000 |  |  |
Balance at end of period | $ 7,275,000 | 6,922,000 |  |  |
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 financing receivables |  |  | 201,988,000 | 203,407,000 |
Individually evaluated for impairment |  |  | 523,000 | 304,000 |
Loans acquired with deteriorated credit quality |  |  | 33,000 | 35,000 |
Collectively evaluated for impairment |  |  | 201,432,000 | 203,068,000 |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 49,000 | 37,000 |
Collectively evaluated for impairment |  |  | 917,000 | 868,000 |
Total | $ 966,000 | 878,000 | 966,000 | 905,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 905,000 | 878,000 |  |  |
Charge-offs | 0 | (17,000) |  |  |
Recoveries | 0 | 0 |  |  |
Provision | 61,000 | 62,000 |  |  |
Balance at end of period | 966,000 | 923,000 |  |  |
Commercial and Agricultural Real Estate Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 299,633,000 | 295,364,000 |
Individually evaluated for impairment |  |  | 6,438,000 | 6,235,000 |
Loans acquired with deteriorated credit quality |  |  | 2,761,000 | 2,908,000 |
Collectively evaluated for impairment |  |  | 290,434,000 | 286,221,000 |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 103,000 | 62,000 |
Collectively evaluated for impairment |  |  | 3,835,000 | 3,723,000 |
Total | 3,938,000 | 3,870,000 | 3,938,000 | 3,785,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 3,785,000 | 3,870,000 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 4,000 | 4,000 |  |  |
Provision | 149,000 | (175,000) |  |  |
Balance at end of period | 3,938,000 | 3,699,000 |  |  |
Construction [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 8,699,000 | 15,011,000 |
Individually evaluated for impairment |  |  | 0 | 0 |
Loans acquired with deteriorated credit quality |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 8,699,000 | 15,011,000 |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 14,000 | 24,000 |
Total | 14,000 | 26,000 | 14,000 | 24,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 24,000 | 26,000 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 0 |  |  |
Provision | (10,000) | (15,000) |  |  |
Balance at end of period | 14,000 | 11,000 |  |  |
Consumer [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 11,125,000 | 11,543,000 |
Individually evaluated for impairment |  |  | 0 | 0 |
Loans acquired with deteriorated credit quality |  |  | 8,000 | 9,000 |
Collectively evaluated for impairment |  |  | 11,117,000 | 11,534,000 |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 96,000 | 102,000 |
Total | 96,000 | 84,000 | 96,000 | 102,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 102,000 | 84,000 |  |  |
Charge-offs | (15,000) | (7,000) |  |  |
Recoveries | 39,000 | 8,000 |  |  |
Provision | (30,000) | (3,000) |  |  |
Balance at end of period | 96,000 | 82,000 |  |  |
Other Commercial and Agricultural Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 69,197,000 | 71,206,000 |
Individually evaluated for impairment |  |  | 6,277,000 | 5,745,000 |
Loans acquired with deteriorated credit quality |  |  | 681,000 | 866,000 |
Collectively evaluated for impairment |  |  | 62,239,000 | 64,595,000 |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 323,000 | 256,000 |
Collectively evaluated for impairment |  |  | 1,024,000 | 1,049,000 |
Total | 1,347,000 | 1,224,000 | 1,347,000 | 1,305,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 1,305,000 | 1,224,000 |  |  |
Charge-offs | 0 | (1,000) |  |  |
Recoveries | 6,000 | 0 |  |  |
Provision | 36,000 | 63,000 |  |  |
Balance at end of period | 1,347,000 | 1,286,000 |  |  |
State and Political Subdivision Loans [Member] |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |
Total financing receivables |  |  | 109,061,000 | 98,500,000 |
Individually evaluated for impairment |  |  | 0 | 0 |
Loans acquired with deteriorated credit quality |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 109,061,000 | 98,500,000 |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 666,000 | 593,000 |
Total | 666,000 | 545,000 | 666,000 | 593,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 593,000 | 545,000 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 0 |  |  |
Provision | 73,000 | 27,000 |  |  |
Balance at end of period | 666,000 | 572,000 |  |  |
Unallocated [Member] |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |
Individually evaluated for impairment |  |  | 0 | 0 |
Collectively evaluated for impairment |  |  | 248,000 | 392,000 |
Total | 392,000 | 188,000 | 248,000 | 392,000 |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance at beginning of period | 392,000 | 188,000 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 0 |  |  |
Provision | (144,000) | 161,000 |  |  |
Balance at end of period | 248,000 | $ 349,000 |  |  |
First National Bank of Fredericksburg [Member] |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |
Unpaid principal balance amount |  |  |  |  | $ 6,969,000
Estimated fair value |  |  |  |  | 3,809,000
Contractually required principal and interest at acquisition |  |  |  |  | 9,913,000
Expected cash flows |  |  |  |  | 4,474,000
Non-accretable discount |  |  |  |  | 5,439,000
Accretable discount | (637,000) |  | (551,000) | (637,000) | $ 665,000
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |
Balance at beginning of period | 637,000 |  |  |  |
Accretion | (86,000) |  |  |  |
Balance at end of period | $ 551,000 |  |  |  |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |
Outstanding balance |  |  | 6,516,000 | 6,950,000 |
Carrying amount |  |  | $ 3,483,000 | $ 3,818,000 |

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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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- Definition Refers to 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 Individually evaluated for impairment. + 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 Loans acquired with deteriorated credit quality. + References No definition available. + Details
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- Definition The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating 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 No definition available. + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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)(2) -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 Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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)(3) -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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