First National (FXNC) 10-Q 12 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 12, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Trading Symbol	FXNC
Entity Registrant Name	FIRST NATIONAL CORP /VA/
Entity Central Index Key	719,402
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		4,940,766

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	[1]
Assets
Cash and due from banks	$ 10,593	$ 10,106
Interest-bearing deposits in banks	35,246	30,986
Securities available for sale, at fair value	91,907	94,802
Securities held to maturity, at amortized cost (fair value, 2017, $51,608; 2016, $52,709)	51,999	53,398
Restricted securities, at cost	1,570	1,548
Loans held for sale		337
Loans, net of allowance for loan losses, 2017, $5,451; 2016, $5,321	492,319	480,746
Other real estate owned, net of valuation allowance, 2017, $0; 2016, $0	250	250
Premises and equipment, net	20,709	20,785
Accrued interest receivable	1,753	1,746
Bank owned life insurance	14,013	13,928
Core deposit intangibles, net	1,382	1,551
Other assets	5,555	5,817
Total assets	727,296	716,000
Deposits:
Noninterest-bearing demand deposits	173,963	168,076
Savings and interest-bearing demand deposits	353,958	349,067
Time deposits	126,848	128,427
Total deposits	654,769	645,570
Subordinated debt	4,934	4,930
Junior subordinated debt	9,279	9,279
Accrued interest payable and other liabilities	4,336	4,070
Total liabilities	673,318	663,849
Shareholders' Equity
Preferred stock, par value $1.25 per share; authorized 1,000,000 shares; none issued and outstanding
Common stock, par value $1.25 per share; authorized 8,000,000 shares; issued and outstanding, 2017, 4,940,766 shares; 2016, 4,929,403 shares	6,176	6,162
Surplus	7,155	7,093
Retained earnings	41,126	39,756
Accumulated other comprehensive loss, net	(479)	(860)
Total shareholders' equity	53,978	52,151
Total liabilities and shareholders' equity	$ 727,296	$ 716,000
[1]	Derived from audited consolidated financial statements.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	[1]
Statement of Financial Position [Abstract]
Securities held to maturity, at fair value	$ 51,608	$ 52,709
Allowance for loan losses	5,451	5,321
Other real estate owned, valuation allowance	$ 0	$ 0
Preferred stock, par value	$ 1.25	$ 1.25
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 1.25	$ 1.25
Common stock, shares authorized	8,000,000	8,000,000
Common stock, shares issued	4,940,766	4,929,403
Common stock, shares outstanding	4,940,766	4,929,403
[1]	Derived from audited consolidated financial statements.

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest and Dividend Income
Interest and fees on loans	$ 5,646	$ 5,236
Interest on deposits in banks	61	48
Interest and dividends on securities:
Taxable interest	662	741
Tax-exempt interest	143	147
Dividends	20	19
Total interest and dividend income	6,532	6,191
Interest Expense
Interest on deposits	383	333
Interest on federal funds purchased		3
Interest on subordinated debt	89	90
Interest on junior subordinated debt	68	61
Interest on other borrowings		5
Total interest expense	540	492
Net interest income	5,992	5,699
Provision for loan losses	0	0
Net interest income after provision for loan losses	5,992	5,699
Noninterest Income
Service charges on deposit accounts	755	780
ATM and check card fees	501	488
Wealth management fees	347	336
Fees for other customer services	140	147
Income from bank owned life insurance	85	86
Net gains on calls and sales of securities available for sale		6
Net gains on sale of loans	33	21
Other operating income	80	79
Total noninterest income	1,941	1,943
Noninterest Expense
Salaries and employee benefits	3,242	3,444
Occupancy	367	424
Equipment	408	432
Marketing	136	107
Supplies	91	101
Legal and professional fees	197	311
ATM and check card fees	162	205
FDIC assessment	79	122
Bank franchise tax	104	103
Telecommunications expense	110	114
Data processing expense	150	128
Postage expense	61	69
Amortization expense	169	207
Other real estate owned expense (income), net	2	(72)
Other operating expense	473	422
Total noninterest expense	5,751	6,117
Income before income taxes	2,182	1,525
Income tax expense	639	426
Net income	$ 1,543	$ 1,099
Earnings per common share
Basic	$ 0.31	$ 0.22
Diluted	$ 0.31	$ 0.22

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,543	$ 1,099
Other comprehensive income, net of tax,
Unrealized holding gains on available for sale securities, net of tax $196 and $387, respectively	381	749
Reclassification adjustment for gains included in net income, net of tax $0 and ($2), respectively		(4)
Total other comprehensive income	381	745
Total comprehensive income	$ 1,924	$ 1,844

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized holding gains on available for sale securities, tax	$ 196	$ 387
Reclassification adjustment for (gains) losses included in net income, tax	$ 0	$ (2)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 1,543	$ 1,099
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	351	334
Amortization of core deposit intangibles	169	207
Amortization of debt issuance costs	4	4
Origination of loans held for sale	(1,428)	(1,506)
Proceeds from sale of loans held for sale	1,798	1,327
Net gains on sales of loans held for sale	(33)	(21)
Net gains on calls and sales of securities available for sale		(6)
Net gains on sale of other real estate owned		(94)
Income from bank owned life insurance	(85)	(86)
Accretion of discounts and amortization of premiums on securities, net	156	219
Accretion of premium on time deposits	(29)	(51)
Stock-based compensation	64	40
Excess tax benefits on stock-based compensation	(14)
Deferred income tax benefit	(102)	(76)
Changes in assets and liabilities:
Increase in interest receivable	(7)	(80)
Decrease (increase) in other assets	168	(45)
Increase in accrued expenses and other liabilities	280	688
Net cash provided by operating activities	2,835	1,953
Cash Flows from Investing Activities
Proceeds from maturities, calls, principal payments, and sales of securities available for sale	3,370	7,531
Proceeds from maturities, calls, and principal payments of securities held to maturity	1,345	1,481
Net purchase of restricted securities	(22)	(157)
Purchase of premises and equipment	(275)	(311)
Proceeds from sale of other real estate owned		698
Purchase of bank owned life insurance		(2,000)
Net increase in loans	(11,573)	(15,118)
Net cash used in investing activities	(7,155)	(7,876)
Cash Flows from Financing Activities
Net increase in demand deposits and savings accounts	10,778	10,367
Net decrease in time deposits	(1,550)	(4,314)
Cash dividends paid on common stock, net of reinvestment	(161)	(137)
Net cash provided by financing activities	9,067	5,916
Increase (decrease) in cash and cash equivalents	4,747	(7)
Cash and Cash Equivalents
Cash and cash equivalents, beginning of year	41,092	39,334
Cash and cash equivalents, end of year	45,839	39,327
Cash payments for:
Interest	576	550
Income Taxes		271
Supplemental Disclosures of Noncash Investing and Financing Activities
Unrealized gains on securities available for sale	577	1,130
Transfer from loans to other real estate owned		37
Issuance of common stock, dividend reinvestment plan	$ 12	$ 11

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total		Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Jan. 01, 2016	$ 45,953		$ 6,145	$ 6,956	$ 34,440	$ (1,588)
Net income	1,099				1,099
Other comprehensive income	745					745
Cash dividends on common stock	(148)				(148)
Stock-based compensation	40			40
Issuance of common stock, dividend reinvestment plan	11		2	9
Issuance of common stock, stock incentive plan			9	(9)
Ending Balance at Mar. 31, 2016	47,700		6,156	6,996	35,391	(843)
Beginning Balance at Dec. 31, 2016	52,151	[1]	6,162	7,093	39,756	(860)
Net income	1,543				1,543
Other comprehensive income	381					381
Cash dividends on common stock	(173)				(173)
Stock-based compensation	64			64
Issuance of common stock, dividend reinvestment plan	12		1	11
Issuance of common stock, stock incentive plan			13	(13)
Ending Balance at Mar. 31, 2017	$ 53,978		$ 6,176	$ 7,155	$ 41,126	$ (479)
[1]	Derived from audited consolidated financial statements.

Consolidated Statements of Cha9

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash dividends on common stock, per share	$ 0.035	$ 0.03
Issuance of common stock dividend reinvestment plan, shares	827	1,185
Issuance of common stock incentive plan, shares	10,536	7,224
Common Stock [Member]
Cash dividends on common stock, per share	$ 0.035	$ 0.03
Issuance of common stock dividend reinvestment plan, shares	827	1,185
Issuance of common stock incentive plan, shares	10,536	7,224

General

General	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
General	Note 1. General The accompanying unaudited consolidated financial statements of First National Corporation (the Company) and its subsidiary, First Bank (the Bank), have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP. All significant intercompany balances and transactions have been eliminated. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments and reclassifications of a normal and recurring nature considered necessary to present fairly the financial positions at March 31, 2017 and December 31, 2016, the statements of income and comprehensive income for the three months ended March 31, 2017 and 2016 and the cash flows and changes in shareholders’ equity for the three months ended March 31, 2017 and 2016. The statements should be read in conjunction with the consolidated financial statements and related notes included in the Annual Report on Form 10-K Change in Accounting Principle On January 1, 2017, the Company adopted ASU No. 2016-09, paid-in one-time 2016-09 Recent Accounting Pronouncements In January 2016, the FASB issued ASU 2016-01, 825-10): 2016-01, 2016-01 In February 2016, the FASB issued ASU No. 2016-02, 2016-02, right-of-use 2016-02 During June 2016, the FASB issued ASU No. 2016-13, available-for-sale 2016-13 During August 2016, the FASB issued ASU No. 2016-15, 2016-15 During January 2017, the FASB issued ASU No. 2017-01, 2017-01 During January 2017, the FASB issued ASU No. 2017-04, 2017-04 During March 2017, the FASB issued ASU 2017-07, disclosed. In addition, only the service cost component will be eligible for capitalization as part of an asset, when applicable. The amendments are effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. Early adoption is permitted. The Company does not expect the adoption of ASU 2017-07 During March 2017, the FASB issued ASU 2017-08, 310-20), 2017-08

Securities

Securities	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	Note 2. Securities The Company invests in U.S. agency and mortgage-backed securities, obligations of state and political subdivisions, corporate equity securities, and corporate debt securities. Amortized costs and fair values of securities at March 31, 2017 and December 31, 2016 were as follows (in thousands): March 31, 2017 Amortized Gross Gross Fair Securities available for sale: U.S. agency and mortgage-backed securities $ 78,026 $ 186 $ (985 ) $ 77,227 Obligations of states and political subdivisions 14,607 198 (136 ) 14,669 Corporate equity securities 1 10 — 11 Total securities available for sale $ 92,634 $ 394 $ (1,121 ) $ 91,907 Securities held to maturity: U.S. agency and mortgage-backed securities $ 35,888 $ 20 $ (351 ) $ 35,557 Obligations of states and political subdivisions 14,611 49 (93 ) 14,567 Corporate debt securities 1,500 — (16 ) 1,484 Total securities held to maturity $ 51,999 $ 69 $ (460 ) $ 51,608 Total securities $ 144,633 $ 463 $ (1,581 ) $ 143,515 December 31, 2016 Amortized Gross Gross Fair Securities available for sale: U.S. agency and mortgage-backed securities $ 81,451 $ 177 $ (1,457 ) $ 80,171 Obligations of states and political subdivisions 14,654 146 (180 ) 14,620 Corporate equity securities 1 10 — 11 Total securities available for sale $ 96,106 $ 333 $ (1,637 ) $ 94,802 Securities held to maturity: U.S. agency and mortgage-backed securities $ 37,269 $ 1 $ (483 ) $ 36,787 Obligations of states and political subdivisions 14,629 18 (211 ) 14,436 Corporate debt securities 1,500 — (14 ) 1,486 Total securities held to maturity $ 53,398 $ 19 $ (708 ) $ 52,709 Total securities $ 149,504 $ 352 $ (2,345 ) $ 147,511 At March 31, 2017 and December 31, 2016, investments in an unrealized loss position that were temporarily impaired were as follows (in thousands): March 31, 2017 Less than 12 months 12 months or more Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Securities available for sale: U.S. agency and mortgage-backed securities $ 52,461 $ (797 ) $ 5,190 $ (188 ) $ 57,651 $ (985 ) Obligations of states and political subdivisions 3,526 (136 ) — — 3,526 (136 ) Total securities available for sale $ 55,987 $ (933 ) $ 5,190 $ (188 ) $ 61,177 $ (1,121 ) Securities held to maturity: U.S. agency and mortgage-backed securities $ 26,783 $ (351 ) $ — $ — $ 26,783 $ (351 ) Obligations of states and political subdivisions 8,755 (93 ) — — 8,755 (93 ) Corporate debt securities 1,484 (16 ) — — 1,484 (16 ) Total securities held to maturity $ 37,022 $ (460 ) $ — $ — $ 37,022 $ (460 ) Total securities $ 93,009 $ (1,393 ) $ 5,190 $ (188 ) $ 98,199 $ (1,581 ) December 31, 2016 Less than 12 months 12 months or more Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Securities available for sale: U.S. agency and mortgage-backed securities $ 60,943 $ (1,249 ) $ 5,499 $ (208 ) $ 66,442 $ (1,457 ) Obligations of states and political subdivisions 5,130 (180 ) — — 5,130 (180 ) Total securities available for sale $ 66,073 $ (1,429 ) $ 5,499 $ (208 ) $ 71,572 $ (1,637 ) Securities held to maturity: U.S. agency and mortgage-backed securities $ 34,770 $ (483 ) $ — $ — $ 34,770 $ (483 ) Obligations of states and political subdivisions 12,724 (211 ) — — 12,724 (211 ) Corporate debt securities 1,486 (14 ) — — 1,486 (14 ) Total securities held to maturity $ 48,980 $ (708 ) $ — $ — $ 48,980 $ (708 ) Total securities $ 115,053 $ (2,137 ) $ 5,499 $ (208 ) $ 120,552 $ (2,345 ) The tables above provide information about securities that have been in an unrealized loss position for less than twelve consecutive months and securities that have been in an unrealized loss position for twelve consecutive months or more. Management evaluates securities for other-than-temporary impairment at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. Impairment is considered to be other-than-temporary if the Company (1) intends to sell the security, (2) more likely than not will be required to sell the security before recovering its cost, or (3) does not expect to recover the security’s entire amortized cost basis. Presently, the Company does not intend to sell any of these securities, does not expect to be required to sell these securities, and expects to recover the entire amortized cost of all the securities. At March 31, 2017, there were fifty-four out of eighty-three U.S. agency and mortgage-backed securities, thirty-three out of seventy-eight obligations of states and political subdivisions, and one corporate debt security in an unrealized loss position. One hundred percent of the Company’s investment portfolio is considered investment grade. The weighted-average re-pricing agency and mortgage-backed securities, fifty out of seventy-eight obligations of states and political subdivisions, and one corporate debt security in an unrealized loss position. One hundred percent of the Company’s investment portfolio was considered investment grade at December 31, 2016. The weighted-average re-pricing The amortized cost and fair value of securities at March 31, 2017 by contractual maturity are shown below (in thousands). Expected maturities of mortgage-backed securities will differ from contractual maturities because borrowers may have the right to prepay obligations with or without call or prepayment penalties. Corporate equity securities are not included in the maturity categories in the following maturity summary because they do not have a stated maturity date. Available for Sale Held to Maturity Amortized Fair Amortized Fair Due within one year $ 1,075 $ 1,077 $ — $ — Due after one year through five years 14,229 14,244 1,773 1,786 Due after five years through ten years 12,185 12,109 18,806 18,770 Due after ten years 65,144 64,466 31,420 31,052 Corporate equity securities 1 11 — — $ 92,634 $ 91,907 $ 51,999 $ 51,608 Federal Home Loan Bank, Federal Reserve Bank and Community Bankers’ Bank stock are generally viewed as long-term investments and as restricted securities, which are carried at cost, because there is a minimal market for the stock. Therefore, when evaluating restricted securities for impairment, their value is based on the ultimate recoverability of the par value rather than by recognizing temporary declines in value. The Company does not consider these investments to be other-than-temporarily impaired at March 31, 2017, and no impairment has been recognized. The composition of restricted securities at March 31, 2017 and December 31, 2016 was as follows (in thousands): March 31, December 31, Federal Home Loan Bank stock $ 645 $ 623 Federal Reserve Bank stock 875 875 Community Bankers’ Bank stock 50 50 $ 1,570 $ 1,548

Loans

Loans	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loans	Note 3. Loans Loans at March 31, 2017 and December 31, 2016 are summarized as follows (in thousands): March 31, December 31, Real estate loans: Construction and land development $ 36,024 $ 34,699 Secured by 1-4 205,623 198,763 Other real estate loans 216,591 211,210 Commercial and industrial loans 29,192 29,981 Consumer and other loans 10,340 11,414 Total loans $ 497,770 $ 486,067 Allowance for loan losses (5,451 ) (5,321 ) Loans, net $ 492,319 $ 480,746 Net deferred loan fees included in the above loan categories were $221 thousand and $142 thousand at March 31, 2017 and December 31, 2016, respectively. Consumer and other loans included $199 thousand and $264 thousand of demand deposit overdrafts at March 31, 2017 and December 31, 2016, respectively. Risk characteristics of each loan portfolio class that are considered by the Company include: • 1-4 • Real estate construction and land development loans carry risks that the project may not be finished according to schedule, the project may not be finished according to budget and the value of the collateral may, at any point in time, be less than the principal amount of the loan. Construction loans also bear the risk that the general contractor, who may or may not be a loan customer, may be unable to finish the construction project as planned because of financial pressure or other factors unrelated to the project. • Other real estate loans carry risks associated with the successful operation of a business or a real estate project, in addition to other risks associated with the ownership of real estate, because repayment of these loans may be dependent upon the profitability and cash flows of the business or project. • Commercial and industrial loans carry risks associated with the successful operation of a business because repayment of these loans may be dependent upon the profitability and cash flows of the business. In addition, there is risk associated with the value of collateral other than real estate which may depreciate over time and cannot be appraised with as much reliability. • Consumer and other loans carry risk associated with the continued creditworthiness of the borrower and the value of the collateral, i.e. rapidly depreciating assets such as automobiles, or lack thereof. Consumer loans are likely to be immediately adversely affected by job loss, divorce, illness or personal bankruptcy, or other changes in circumstances. The following tables provide a summary of loan classes and an aging of past due loans as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 30-59 60-89 > 90 Total Current Total Non-accrual 90 Days Real estate loans: Construction and land development $ 504 $ 41 $ — $ 545 $ 35,479 $ 36,024 $ 1,134 $ — Secured by 1-4 678 494 149 1,321 204,302 205,623 389 33 Other real estate loans 254 538 86 878 215,713 216,591 73 86 Commercial and industrial — 26 — 26 29,166 29,192 — — Consumer and other loans 40 31 — 71 10,269 10,340 — — Total $ 1,476 $ 1,130 $ 235 $ 2,841 $ 494,929 $ 497,770 $ 1,596 $ 119 December 31, 2016 30-59 60-89 > 90 Total Current Total Non-accrual 90 Days Real estate loans: Construction and land development $ — $ 40 $ — $ 40 $ 34,659 $ 34,699 $ 1,033 $ — Secured by 1-4 980 170 410 1,560 197,203 198,763 413 84 Other real estate loans 321 701 — 1,022 210,188 211,210 74 — Commercial and industrial 36 309 32 377 29,604 29,981 — 32 Consumer and other loans 19 7 — 26 11,388 11,414 — — Total $ 1,356 $ 1,227 $ 442 $ 3,025 $ 483,042 $ 486,067 $ 1,520 $ 116 Credit Quality Indicators As part of the ongoing monitoring of the credit quality of the Company’s loan portfolio, management tracks certain credit quality indicators including trends related to the risk grading of specified classes of loans. The Company utilizes a risk grading matrix to assign a rating to each of its loans. The loan ratings are summarized into the following categories: pass, special mention, substandard, doubtful and loss. Pass rated loans include all risk rated credits other than those included in special mention, substandard or doubtful. Loans classified as loss are charged-off. Pass – Special Mention – Substandard – Doubtful – non-accrual Loss – The following tables provide an analysis of the credit risk profile of each loan class as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Pass Special Substandard Doubtful Total Real estate loans: Construction and land development $ 30,522 $ 2,267 $ 3,235 $ — $ 36,024 Secured by 1-4 200,347 3,319 1,957 — 205,623 Other real estate loans 205,504 6,933 4,154 — 216,591 Commercial and industrial 28,689 377 126 — 29,192 Consumer and other loans 10,340 — — — 10,340 Total $ 475,402 $ 12,896 $ 9,472 $ — $ 497,770 December 31, 2016 Pass Special Substandard Doubtful Total Real estate loans: Construction and land development $ 29,416 $ 2,402 $ 2,881 $ — $ 34,699 Secured by 1-4 193,395 3,295 2,073 — 198,763 Other real estate loans 200,009 6,990 4,211 — 211,210 Commercial and industrial 29,456 386 139 — 29,981 Consumer and other loans 11,414 — — — 11,414 Total $ 463,690 $ 13,073 $ 9,304 $ — $ 486,067

Allowance for Loan Losses

Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Allowance for Loan Losses	Note 4. Allowance for Loan Losses The following tables present, as of March 31, 2017, December 31, 2016 and March 31, 2016, the total allowance for loan losses, the allowance by impairment methodology and loans by impairment methodology (in thousands): March 31, 2017 Construction Secured by 1-4 Other Real Commercial Consumer Total Allowance for loan losses: Beginning Balance, December 31, 2016 $ 441 $ 1,019 $ 3,142 $ 380 $ 339 $ 5,321 Charge-offs — — — — (106 ) (106 ) Recoveries 1 128 47 5 55 236 Provision for (recovery of) loan losses 39 (187 ) 78 (10 ) 80 — Ending Balance, March 31, 2017 $ 481 $ 960 $ 3,267 $ 375 $ 368 $ 5,451 Ending Balance: Individually evaluated for impairment — 31 — — — 31 Collectively evaluated for impairment 481 929 3,267 375 368 5,420 Loans: Ending Balance $ 36,024 $ 205,623 $ 216,591 $ 29,192 $ 10,340 $ 497,770 Individually evaluated for impairment 2,022 1,443 977 71 — 4,513 Collectively evaluated for impairment 34,002 204,180 215,614 29,121 10,340 493,257 December 31, 2016 Construction Secured by 1-4 Other Real Commercial Consumer Total Allowance for loan losses: Beginning Balance, December 31, 2015 $ 1,532 $ 939 $ 2,534 $ 306 $ 213 $ 5,524 Charge-offs — (83 ) (165 ) — (540 ) (788 ) Recoveries 4 293 2 11 275 585 Provision for (recovery of) loan losses (1,095 ) (130 ) 771 63 391 — Ending Balance, December 31, 2016 $ 441 $ 1,019 $ 3,142 $ 380 $ 339 $ 5,321 Ending Balance: Individually evaluated for impairment — 37 — — — 37 Collectively evaluated for impairment 441 982 3,142 380 339 5,284 Loans: Ending Balance $ 34,699 $ 198,763 $ 211,210 $ 29,981 $ 11,414 $ 486,067 Individually evaluated for impairment 1,973 1,828 984 75 — 4,860 Collectively evaluated for impairment 32,726 196,935 210,226 29,906 11,414 481,207 March 31, 2016 Construction Secured by 1-4 Other Real Commercial Consumer Total Allowance for loan losses: Beginning Balance, December 31, 2015 $ 1,532 $ 939 $ 2,534 $ 306 $ 213 $ 5,524 Charge-offs — (2 ) — — (118 ) (120 ) Recoveries 1 9 — 3 103 116 Provision for (recovery of) loan losses (163 ) 38 117 (12 ) 20 — Ending Balance, March 31, 2016 $ 1,370 $ 984 $ 2,651 $ 297 $ 218 $ 5,520 Ending Balance: Individually evaluated for impairment 222 22 190 — — 434 Collectively evaluated for impairment 1,148 962 2,461 297 218 5,086 Loans: Ending Balance $ 31,505 $ 196,165 $ 191,306 $ 24,215 $ 10,885 $ 454,076 Individually evaluated for impairment 2,675 2,062 2,990 89 — 7,816 Collectively evaluated for impairment 28,830 194,103 188,316 24,126 10,885 446,260 Impaired loans and the related allowance at March 31, 2017, December 31, 2016 and March 31, 2016, were as follows (in thousands): March 31, 2017 Unpaid Recorded Recorded Total Related Average Interest Real estate loans: Construction and land development $ 2,455 $ 2,022 $ — $ 2,022 $ — $ 1,922 $ 13 Secured by 1-4 1,469 1,358 85 1,443 31 1,781 16 Other real estate loans 1,206 977 — 977 — 980 19 Commercial and industrial 89 71 — 71 — 73 1 Total $ 5,219 $ 4,428 $ 85 $ 4,513 $ 31 $ 4,756 $ 49 December 31, 2016 Unpaid Recorded Recorded Total Related Average Interest Real estate loans: Construction and land development $ 2,388 $ 1,973 $ — $ 1,973 $ — $ 2,407 $ 66 Secured by 1-4 1,851 1,675 153 1,828 37 2,013 87 Other real estate loans 1,213 984 — 984 — 2,529 22 Commercial and industrial 93 75 — 75 — 85 1 Total $ 5,545 $ 4,707 $ 153 $ 4,860 $ 37 $ 7,034 $ 176 March 31, 2016 Unpaid Recorded Recorded Total Related Average Interest Real estate loans: Construction and land development $ 2,897 $ 2,253 $ 422 $ 2,675 $ 222 $ 2,593 $ 16 Secured by 1-4 2,136 2,040 22 2,062 22 2,059 24 Other real estate loans 3,549 2,436 554 2,990 190 3,069 8 Commercial and industrial 104 89 — 89 — 92 — Total $ 8,686 $ 6,818 $ 998 $ 7,816 $ 434 $ 7,813 $ 48 The “Recorded Investment” amounts in the table above represent the outstanding principal balance on each loan represented in the table. The “Unpaid Principal Balance” represents the outstanding principal balance on each loan represented in the table plus any amounts that have been charged off on each loan and/or payments that have been applied towards principal on non-accrual As of March 31, 2017, loans classified as troubled debt restructurings (TDRs) and included in impaired loans in the disclosure above totaled $454 thousand. At March 31, 2017, $296 thousand of the loans classified as TDRs were performing under the restructured terms and were not considered non-performing For the three months ended March 31, 2017 and 2016, there were no troubled debt restructurings that subsequently defaulted within twelve months of the loan modification. Management defines default as over ninety days past due or the foreclosure and repossession of the collateral or charge-off

Other Real Estate Owned (OREO)

Other Real Estate Owned (OREO)	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Other Real Estate Owned (OREO)	Note 5. Other Real Estate Owned (OREO) Changes in the balance for OREO are as follows (in thousands): For the three months ended For the year ended March 31, December 31, 2017 2016 Balance at the beginning of year, gross $ 250 $ 2,903 Transfers in — 287 Charge-offs — (251 ) Sales proceeds — (2,882 ) Gain on disposition — 193 Balance at the end of period, gross $ 250 $ 250 Less: valuation allowance — — Balance at the end of period, net $ 250 $ 250 There were no residential real estate properties included in the ending OREO balances above at March 31, 2017 and December 31, 2016. The Bank did not have any consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process as of March 31, 2017. Changes in the valuation allowance are as follows (in thousands): For the three months ended For the year ended March 31, March 31, December 31, 2017 2016 2016 Balance at beginning of year $ — $ 224 $ 224 Provision for losses — — 27 Charge-offs, net — (70 ) (251 ) Balance at end of period $ — $ 154 $ — Net expenses applicable to OREO, other than the provision for losses, were $2 thousand and $22 thousand for the three months ended March 31, 2017 and 2016, respectively and $46 thousand for the year ended December 31, 2016.

Other Borrowings

Other Borrowings	3 Months Ended
	Mar. 31, 2017
Text Block [Abstract]
Other Borrowings	Note 6. Other Borrowings The Bank had unused lines of credit totaling $131.0 million and $125.6 million available with non-affiliated

Capital Requirements

Capital Requirements	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Capital Requirements	Note 7. Capital Requirements The Bank is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance-sheet The final rules implementing the Basel Committee on Banking Supervision’s capital guidelines for U.S. banks (Basel III rules) became effective January 1, 2015, with full compliance of all the requirements being phased in over a multi-year schedule, and becoming fully phased in by January 1, 2019. As part of the new requirements, the common equity Tier 1 capital ratio is calculated and utilized in the assessment of capital for all institutions. The final rules also established a “capital conservation buffer” above the new regulatory minimum capital requirements. The capital conservation buffer is being phased-in Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the following table) of total (as defined in the regulations), Tier 1 (as defined), and common equity Tier 1 capital (as defined) to risk-weighted assets (as defined), and of Tier 1 capital to average assets. Management believes, as of March 31, 2017 and December 31, 2016, that the Bank met all capital adequacy requirements to which it is subject. As of March 31, 2017, the most recent notification from the Federal Reserve Bank categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum risk-based capital and leverage ratios as set forth in the following table. There are no conditions or events since that notification that management believes have changed the Bank’s category. A comparison of the capital of the Bank at March 31, 2017 and December 31, 2016 with the minimum regulatory guidelines were as follows (dollars in thousands): Minimum To Be Well Capitalized Under Minimum Capital Prompt Corrective Actual Requirement Action Provisions Amount Ratio Amount Ratio Amount Ratio March 31, 2017: Total Capital (to Risk-Weighted Assets) $ 67,264 13.53 % $ 39,769 8.00 % $ 49,711 10.00 % Tier 1 Capital (to Risk-Weighted Assets) $ 61,813 12.43 % $ 29,827 6.00 % $ 39,769 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 61,813 12.43 % $ 22,370 4.50 % $ 32,312 6.50 % Tier 1 Capital (to Average Assets) $ 61,813 8.66 % $ 28,539 4.00 % $ 35,674 5.00 % December 31, 2016: Total Capital (to Risk-Weighted Assets) $ 65,590 13.47 % $ 38,951 8.00 % $ 48,689 10.00 % Tier 1 Capital (to Risk-Weighted Assets) $ 60,269 12.38 % $ 29,213 6.00 % $ 38,951 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 60,269 12.38 % $ 21,910 4.50 % $ 31,648 6.50 % Tier 1 Capital (to Average Assets) $ 60,269 8.48 % $ 28,432 4.00 % $ 35,540 5.00 % In addition to the regulatory minimum risk-based capital amounts presented above, the Bank must maintain a capital conservation buffer as required by the Basel III final rules. The buffer began applying to the Bank on January 1, 2016, and is subject to phase-in

Subordinated Debt

Subordinated Debt	3 Months Ended
	Mar. 31, 2017
Brokers and Dealers [Abstract]
Subordinated Debt	Note 8. Subordinated Debt On October 30, 2015, the Company entered into a Subordinated Loan Agreement (the Agreement) pursuant to which the Company issued an interest only subordinated term note due 2025 in the aggregate principal amount of $5.0 million (the Note). The Note bears interest at a fixed rate of 6.75% per annum. The Note qualifies as Tier 2 capital for regulatory capital purposes and at March 31, 2017, the total amount of subordinated debt issued was included in the Company’s Tier 2 capital. Unamortized debt issuance costs related to the Note were $66 thousand and $70 thousand at March 31, 2017 and December 31, 2016, respectively. The Note has a maturity date of October 1, 2025. Subject to regulatory approval, the Company may prepay the Note, in part or in full, beginning on October 30, 2020. The Note is an unsecured, subordinated obligation of the Company and ranks junior in right of payment to the Company’s senior indebtedness and to the Company’s obligations to its general creditors. The Note ranks equally with all other unsecured subordinated debt, except any which by its terms is expressly stated to be subordinated to the Note. The Note ranks senior to all current and future junior subordinated debt obligations, preferred stock and common stock of the Company. The Note is not convertible into common stock or preferred stock. The Agreement contains customary events of default such as the bankruptcy of the Company and the non-payment

Junior Subordinated Debt

Junior Subordinated Debt	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Junior Subordinated Debt	Note 9. Junior Subordinated Debt On June 8, 2004, First National (VA) Statutory Trust II (Trust II), a wholly-owned subsidiary of the Company, was formed for the purpose of issuing redeemable capital securities, commonly known as trust preferred securities. On June 17, 2004, $5.0 million of trust preferred securities were issued through a pooled underwriting. The securities have a LIBOR-indexed floating rate of interest. The interest rate at March 31, 2017 and December 31, 2016 was 3.75% and 3.59%, respectively. The securities have a mandatory redemption date of June 17, 2034, and were subject to varying call provisions that began September 17, 2009. The principal asset of Trust II is $5.2 million of the Company’s junior subordinated debt with maturities and interest rates comparable to the trust preferred securities. The Trust’s obligations under the trust preferred securities are fully and unconditionally guaranteed by the Company. The Company is current on its interest payments on the junior subordinated debt. On July 24, 2006, First National (VA) Statutory Trust III (Trust III), a wholly-owned subsidiary of the Company, was formed for the purpose of issuing redeemable capital securities. On July 31, 2006, $4.0 million of trust preferred securities were issued through a pooled underwriting. The securities have a LIBOR-indexed floating rate of interest. The interest rate at March 31, 2017 and December 31, 2016 was 2.60% and 2.45%, respectively. The securities have a mandatory redemption date of October 1, 2036, and were subject to varying call provisions that began October 1, 2011. The principal asset of Trust III is $4.1 million of the Company’s junior subordinated debt with maturities and interest rates comparable to the trust preferred securities. The Trust’s obligations under the trust preferred securities are fully and unconditionally guaranteed by the Company. The Company is current on its interest payments on the junior subordinated debt. While these securities are debt obligations of the Company, they are included in capital for regulatory capital ratio calculations. Under present regulations, the junior subordinated debt may be included in Tier 1 capital for regulatory capital adequacy purposes as long as their amount does not exceed 25% of Tier 1 capital, including total junior subordinated debt. The portion of the junior subordinated debt not considered as Tier 1 capital, if any, may be included in Tier 2 capital. At March 31, 2017 and December 31, 2016, the total amount of junior subordinated debt issued by the Trusts was included in the Company’s Tier 1 capital.

Benefit Plans

Benefit Plans	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Benefit Plans	Note 10. Benefit Plans The Bank has a noncontributory, defined benefit pension plan for all full-time employees over 21 years of age with at least one year of credited service and hired prior to May 1, 2011. Effective May 1, 2011, the plan was frozen to new participants. Only individuals employed on or before April 30, 2011 were eligible to become participants in the plan upon satisfaction of the eligibility requirements. Benefits are generally based upon years of service and average compensation for the five highest-paid consecutive years of service. The Bank’s funding practice has been to make at least the minimum required annual contribution permitted by the Employee Retirement Income Security Act of 1974, as amended, and the Internal Revenue Code of 1986, as amended. On September 14, 2016, the defined benefit pension plan was amended to be terminated and the amendment has been submitted to the Internal Revenue Service and the Pension Benefit Guarantee Corporation for approval. Under the amendment, benefit accruals ceased as of November 30, 2016. Although an application for termination approval is in process, the date of possible Internal Revenue Service approval is unknown and there can be no assurance of when the plan will be terminated. The funding status of the plan upon termination is not expected to be significantly different from the funded status disclosed in Note 13 of the consolidated financial statements included in the Company’s Annual Report on Form 10-K Components of the net periodic benefit cost of the plan for the three months ended March 31, 2017 and 2016 were as follows (in thousands): For the three months ended March 31, 2017 2016 Service cost $ — $ 102 Interest cost 21 83 Expected return on plan assets (9 ) (74 ) Recognized net actuarial loss — 21 Net periodic benefit cost $ 12 $ 132 The Company previously disclosed in its consolidated financial statements in its Annual Report on Form 10-K In addition to the defined benefit pension plan, the Company maintains a 401(k) plan and an employee stock ownership plan (ESOP) for eligible employees. On September 14, 2016, the ESOP was amended to freeze the plan to new participants and to cease all contributions, effective December 31, 2016. The amendment also directs matching contributions and certain other retirement contributions made by the Company to the 401(k) plan. The ESOP shall be maintained as a frozen plan and continue to be invested in Company stock and such other assets as permitted under the ESOP and Trust Agreement for the benefit of participants and their beneficiaries. See Note 13 of the consolidated financial statements included in the Company’s Annual Report on Form 10-K

Earnings per Common Share

Earnings per Common Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings per Common Share	Note 11. Earnings per Common Share Basic earnings per common share represents income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per common share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustment to income that would result from the assumed issuance. The following table presents the computation of basic and diluted earnings per share for the three months ended March 31, 2017 and 2016 (dollars in thousands, except per share data): For the three months ended March 31, March 31, (Numerator): Net income $ 1,543 $ 1,099 (Denominator): Weighted average shares outstanding – basic 4,935,421 4,920,315 Potentially dilutive common shares – restricted stock units 2,204 2,802 Weighted average shares outstanding – diluted 4,937,625 4,923,117 Income per common share Basic $ 0.31 $ 0.22 Diluted $ 0.31 $ 0.22

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 12. Fair Value Measurements The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In accordance with the “Fair Value Measurement and The fair value guidance provides a consistent definition of fair value, which focuses on exit price in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. The fair value is a reasonable point within the range that is most representative of fair value under current market conditions. Fair Value Hierarchy In accordance with this guidance, the Company groups its assets and liabilities generally measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. Level 1 – Valuation is based on quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 1 assets and liabilities generally include debt and equity securities that are traded in an active exchange market. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. Level 2 – Valuation is based on inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. The valuation may be based on quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. Level 3 – Valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which determination of fair value requires a significant management judgment or estimation. An instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The following describes the valuation techniques used by the Company to measure certain assets recorded at fair value on a recurring basis in the financial statements: Securities available for sale Securities available for sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted market prices, when available (Level 1). If quoted market prices are not available, fair values are measured utilizing independent valuation techniques of identical or similar securities for which significant assumptions are derived primarily from or corroborated by observable market data. Third party vendors compile prices from various sources and may determine the fair value of identical or similar securities by using pricing models that consider observable market data (Level 2). The following tables present the balances of assets measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 (in thousands). Fair Value Measurements at March 31, 2017 Description Balance as of Quoted Significant Significant Securities available for sale U.S. agency and mortgage-backed securities $ 77,227 $ — $ 77,227 $ — Obligations of states and political subdivisions 14,669 — 14,669 — Corporate equity securities 11 11 — — $ 91,907 $ 11 $ 91,896 $ — Fair Value Measurements at December 31, 2016 Description Balance as of Quoted Significant Significant Securities available for sale U.S. agency and mortgage-backed securities $ 80,171 $ — $ 80,171 $ — Obligations of states and political subdivisions 14,620 — 14,620 — Corporate equity securities 11 11 — — $ 94,802 $ 11 $ 94,791 $ — Certain assets are measured at fair value on a nonrecurring basis in accordance with GAAP. Adjustments to the fair value of these assets usually result from the application of lower-of-cost-or-market The following describes the valuation techniques used by the Company to measure certain assets recorded at fair value on a nonrecurring basis in the financial statements: Loans held for sale Loans held for sale are carried at the lower of cost or market value. These loans currently consist of one-to-four Impaired Loans Loans are designated as impaired when, in the judgment of management based on current information and events, it is probable that all amounts due according to the contractual terms of the loan agreements will not be collected. The measurement of loss associated with impaired loans can be based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the observable market price of the loan, or the fair value of the collateral less estimated costs to sell. Collateral may be in the form of real estate or business assets including equipment, inventory, and accounts receivable. The vast majority of the Company’s collateral is real estate. The value of real estate collateral is determined utilizing a market valuation approach based on an appraisal conducted by an independent, licensed appraiser using observable market data (Level 2) within the last twelve months. However, if the collateral is a house or building in the process of construction or if an appraisal of the property is more than one year old and not solely based on observable market comparables or management determines the fair value of the collateral is further impaired below the appraised value, then a Level 3 valuation is considered to measure the fair value. The value of business equipment is based upon an outside appraisal, of one year or less, if deemed significant, or the net book value on the applicable business’s financial statements if not considered significant using observable market data. Likewise, values for inventory and accounts receivables collateral are based on financial statement balances or aging reports (Level 3). Impaired loans allocated to the allowance for loan losses are measured at fair value on a nonrecurring basis. Any fair value adjustments are recorded in the period incurred as provision for loan losses on the Consolidated Statements of Income. Other real estate owned Loans are transferred to other real estate owned when the collateral securing them is foreclosed on or acquired through a deed in lieu of foreclosure. The measurement of loss associated with other real estate owned is based on the appraisal documents and assessed the same way as impaired loans described above. Any fair value adjustments are recorded in the period incurred as other real estate owned expense (income) on the Consolidated Statements of Income. The following tables summarize the Company’s assets that were measured at fair value on a nonrecurring basis during the periods (dollars in thousands): Fair Value Measurements at March 31, 2017 Description Balance as of Quoted Significant Significant Impaired loans, net $ 54 $ — $ — $ 54 Other real estate owned 250 — — 250 Fair Value Measurements at December 31, 2016 Description Balance as of Quoted Significant Significant Impaired loans, net $ 116 $ — $ — $ 116 Other real estate owned 250 — — 250 Quantitative information about Level 3 Fair Value Measurements for March 31, 2017 Fair Value Valuation Technique Unobservable Input Range (Weighted-Average) Impaired loans, net $ 54 Property appraisals Selling cost 10 % Other real estate owned $ 250 Property appraisals Selling cost 0 % Quantitative information about Level 3 Fair Value Measurements for December 31, 2016 Fair Value Valuation Technique Unobservable Input Range Impaired loans, net $ 116 Property appraisals Selling cost 10 % Other real estate owned $ 250 Property appraisals Selling cost 0 % The amount disclosed as fair value of other real estate owned at March 31, 2017 and December 31, 2016 represents the carrying value of the property. Since the appraised value of the property, net of selling costs, exceeded the Company’s carrying value on the date the property was transferred from premises and equipment to other real estate owned, the Company did not adjust the carrying value for selling costs. Accounting guidance requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring non-recurring Cash and Cash Equivalents and Federal Funds Sold The carrying amounts of cash and short-term instruments approximate fair values. Securities Held to Maturity Certain debt securities that management has the positive intent and ability to hold until maturity are recorded at amortized cost. Fair values are determined in a manner that is consistent with securities available for sale. Restricted Securities The carrying value of restricted securities approximates fair value based on redemption provisions. Loans For variable-rate loans that re-price non-performing Deposit Liabilities The fair value of demand deposits, savings accounts, and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed-rate certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. Accrued Interest Accrued interest receivable and payable were estimated to equal the carrying value due to the short-term nature of these financial instruments. Borrowings and Federal Funds Purchased The carrying amounts of federal funds purchased and other short-term borrowings maturing within ninety days approximate their fair values. Fair values of all other borrowings are estimated using discounted cash flow analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. Bank Owned Life Insurance Bank owned life insurance represents insurance policies on officers, directors, and past directors of the Company. The cash values of these policies are estimates using information provided by insurance carriers. These policies are carried at their cash surrender value, which approximates the fair value. Commitments and Unfunded Credits The fair value of commitments to extend credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of stand-by The carrying values and estimated fair values of the Company’s financial instruments at March 31, 2017 and December 31, 2016 are as follows (in thousands): Fair Value Measurements at March 31, 2017 Using Carrying Quoted Significant Significant Fair Value Financial Assets Cash and short-term investments $ 45,839 $ 45,839 $ — $ — $ 45,839 Securities available for sale 91,907 11 91,896 — 91,907 Securities held to maturity 51,999 — 50,124 1,484 51,608 Restricted securities 1,570 — 1,570 — 1,570 Loans, net 492,319 — — 492,578 492,578 Bank owned life insurance 14,013 — 14,013 — 14,013 Accrued interest receivable 1,753 — 1,753 — 1,753 Financial Liabilities Deposits $ 654,769 $ — $ 527,921 $ 125,608 $ 653,529 Subordinated debt 4,934 — — 4,709 4,709 Junior subordinated debt 9,279 — — 9,175 9,175 Accrued interest payable 88 — 88 — 88 Fair Value Measurements at December 31, 2016 Using Carrying Quoted Significant Significant Fair Value Financial Assets Cash and short-term investments $ 41,092 $ 41,092 $ — $ — $ 41,092 Securities available for sale 94,802 11 94,791 — 94,802 Securities held to maturity 53,398 — 51,223 1,486 52,709 Restricted securities 1,548 — 1,548 — 1,548 Loans held for sale 337 — 337 — 337 Loans, net 480,746 — — 481,475 481,475 Bank owned life insurance 13,928 — 13,928 — 13,928 Accrued interest receivable 1,746 — 1,746 — 1,746 Financial Liabilities Deposits $ 645,570 $ — $ 517,143 $ 127,179 $ 644,322 Subordinated debt 4,930 — — 4,715 4,715 Junior subordinated debt 9,279 — — 9,075 9,075 Accrued interest payable 95 — 95 — 95 The Company assumes interest rate risk (the risk that general interest rate levels will change) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments will change when interest rate levels change and that change may be either favorable or unfavorable to the Company. Management attempts to match maturities of assets and liabilities to the extent believed necessary to minimize interest rate risk. However, borrowers with fixed rate obligations are less likely to prepay in a rising rate environment and more likely to prepay in a falling rate environment. Conversely, depositors who are receiving fixed rates are more likely to withdraw funds before maturity in a rising rate environment and less likely to do so in a falling rate environment. Management monitors rates and maturities of assets and liabilities and attempts to minimize interest rate risk by adjusting terms of new loans and deposits and by investing in securities with terms that mitigate the Company’s overall interest rate risk.

Stock Compensation Plans

Stock Compensation Plans	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation Plans	Note 13. Stock Compensation Plans On May 13, 2014, the Company’s shareholders approved the First National Corporation 2014 Stock Incentive Plan, which makes available up to 240,000 shares of common stock for the granting of stock options, restricted stock awards, stock appreciation rights and other stock-based awards. Awards are made at the discretion of the Board of Directors and compensation cost equal to the fair value of the award is recognized over the vesting period. Stock Awards Whenever the Company deems it appropriate to grant a stock award, the recipient receives a specified number of unrestricted shares of employer stock. Stock awards may be made by the Company at its discretion without cash consideration and may be granted as settlement of a performance-based compensation award. During the first quarter of 2017, the Company granted and issued 2,000 shares of common stock to the Chief Executive Officer for his individual performance and dedicated service to the Company. Compensation expense related to stock awards totaled $30 thousand for the three months ended March 31, 2017. The Company did not have compensation expense related to stock awards for the three months ended March 31, 2016. Restricted Stock Units Restricted stock units are an award of units that correspond in number and value to a specified number of shares of employer stock which the recipient receives according to a vesting plan and distribution schedule after achieving required performance milestones or upon remaining with the employer for a particular length of time. Each restricted stock unit that vests entitles the recipient to receive one share of common stock on a specified issuance date. In the first quarter of 2017, 3,939 restricted stock units were granted to employees, with 1,317 units vesting immediately and 2,622 units subject to a two year vesting schedule with one half of the units vesting each year on the grant date anniversary. The recipient does not have any stockholder rights, including voting, dividend or liquidation rights, with respect to the shares underlying awarded restricted stock units until vesting has occurred and the recipient becomes the record holder of those shares. The unvested restricted stock units will vest on the established schedule if the employees remain employed by the Company on future vesting dates. A summary of the activity for the Company’s restricted stock units for the period indicated is presented in the following table: March 31, 2017 Shares Weighted Unvested, beginning of period 10,259 $ 8.88 Granted 3,939 15.20 Vested (8,536 ) 9.89 Forfeited — — Unvested, end of period 5,662 $ 11.76 At March 31, 2017, based on restricted stock unit awards outstanding at that time, the total unrecognized pre-tax

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 14. Accumulated Other Comprehensive Loss Changes in each component of accumulated other comprehensive loss were as follows (in thousands): Net Adjustments Accumulated Balance at December 31, 2015 $ (192 ) $ (1,396 ) $ (1,588 ) Unrealized holding gains (net of tax, $387) 749 — 749 Reclassification adjustment (net of tax, ($2)) (4 ) — (4 ) Change during period 745 — 745 Balance at March 31, 2016 $ 553 $ (1,396 ) $ (843 ) Balance at December 31, 2016 $ (860 ) $ — $ (860 ) Unrealized holding gains (net of tax, $196) 381 — 381 Change during period 381 — 381 Balance at March 31, 2017 $ (479 ) $ — $ (479 ) The following tables present information related to reclassifications from accumulated other comprehensive loss for the three month periods ended March 31, 2017 and 2016 (in thousands). Details About Accumulated Other Comprehensive Loss Amount Reclassified from Affected Line Item in the Consolidated Statements of Income For the three months ended March 31 2017 2016 Securities available for sale: Net securities gains reclassified into earnings $ — $ (6 ) Net gains on calls and sales of securities available for sale Related income tax expense — 2 Income tax expense Total reclassifications $ — $ (4 ) Net of tax

General (Policies)

General (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Change in Accounting Principle	Change in Accounting Principle On January 1, 2017, the Company adopted ASU No. 2016-09, paid-in one-time 2016-09
Recent Accounting Pronouncements	Recent Accounting Pronouncements In January 2016, the FASB issued ASU 2016-01, 825-10): 2016-01, 2016-01 In February 2016, the FASB issued ASU No. 2016-02, 2016-02, right-of-use 2016-02 During June 2016, the FASB issued ASU No. 2016-13, available-for-sale 2016-13 During August 2016, the FASB issued ASU No. 2016-15, 2016-15 During January 2017, the FASB issued ASU No. 2017-01, 2017-01 During January 2017, the FASB issued ASU No. 2017-04, 2017-04 During March 2017, the FASB issued ASU 2017-07, disclosed. In addition, only the service cost component will be eligible for capitalization as part of an asset, when applicable. The amendments are effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. Early adoption is permitted. The Company does not expect the adoption of ASU 2017-07 During March 2017, the FASB issued ASU 2017-08, 310-20), 2017-08
Fair Value Measurement and Disclosures	The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In accordance with the “Fair Value Measurement and

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Costs and Fair Values of Securities	Amortized costs and fair values of securities at March 31, 2017 and December 31, 2016 were as follows (in thousands): March 31, 2017 Amortized Gross Gross Fair Securities available for sale: U.S. agency and mortgage-backed securities $ 78,026 $ 186 $ (985 ) $ 77,227 Obligations of states and political subdivisions 14,607 198 (136 ) 14,669 Corporate equity securities 1 10 — 11 Total securities available for sale $ 92,634 $ 394 $ (1,121 ) $ 91,907 Securities held to maturity: U.S. agency and mortgage-backed securities $ 35,888 $ 20 $ (351 ) $ 35,557 Obligations of states and political subdivisions 14,611 49 (93 ) 14,567 Corporate debt securities 1,500 — (16 ) 1,484 Total securities held to maturity $ 51,999 $ 69 $ (460 ) $ 51,608 Total securities $ 144,633 $ 463 $ (1,581 ) $ 143,515 December 31, 2016 Amortized Gross Gross Fair Securities available for sale: U.S. agency and mortgage-backed securities $ 81,451 $ 177 $ (1,457 ) $ 80,171 Obligations of states and political subdivisions 14,654 146 (180 ) 14,620 Corporate equity securities 1 10 — 11 Total securities available for sale $ 96,106 $ 333 $ (1,637 ) $ 94,802 Securities held to maturity: U.S. agency and mortgage-backed securities $ 37,269 $ 1 $ (483 ) $ 36,787 Obligations of states and political subdivisions 14,629 18 (211 ) 14,436 Corporate debt securities 1,500 — (14 ) 1,486 Total securities held to maturity $ 53,398 $ 19 $ (708 ) $ 52,709 Total securities $ 149,504 $ 352 $ (2,345 ) $ 147,511
Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired	At March 31, 2017 and December 31, 2016, investments in an unrealized loss position that were temporarily impaired were as follows (in thousands): March 31, 2017 Less than 12 months 12 months or more Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Securities available for sale: U.S. agency and mortgage-backed securities $ 52,461 $ (797 ) $ 5,190 $ (188 ) $ 57,651 $ (985 ) Obligations of states and political subdivisions 3,526 (136 ) — — 3,526 (136 ) Total securities available for sale $ 55,987 $ (933 ) $ 5,190 $ (188 ) $ 61,177 $ (1,121 ) Securities held to maturity: U.S. agency and mortgage-backed securities $ 26,783 $ (351 ) $ — $ — $ 26,783 $ (351 ) Obligations of states and political subdivisions 8,755 (93 ) — — 8,755 (93 ) Corporate debt securities 1,484 (16 ) — — 1,484 (16 ) Total securities held to maturity $ 37,022 $ (460 ) $ — $ — $ 37,022 $ (460 ) Total securities $ 93,009 $ (1,393 ) $ 5,190 $ (188 ) $ 98,199 $ (1,581 ) December 31, 2016 Less than 12 months 12 months or more Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Securities available for sale: U.S. agency and mortgage-backed securities $ 60,943 $ (1,249 ) $ 5,499 $ (208 ) $ 66,442 $ (1,457 ) Obligations of states and political subdivisions 5,130 (180 ) — — 5,130 (180 ) Total securities available for sale $ 66,073 $ (1,429 ) $ 5,499 $ (208 ) $ 71,572 $ (1,637 ) Securities held to maturity: U.S. agency and mortgage-backed securities $ 34,770 $ (483 ) $ — $ — $ 34,770 $ (483 ) Obligations of states and political subdivisions 12,724 (211 ) — — 12,724 (211 ) Corporate debt securities 1,486 (14 ) — — 1,486 (14 ) Total securities held to maturity $ 48,980 $ (708 ) $ — $ — $ 48,980 $ (708 ) Total securities $ 115,053 $ (2,137 ) $ 5,499 $ (208 ) $ 120,552 $ (2,345 )
Amortized Cost and Fair Value of Securities	The amortized cost and fair value of securities at March 31, 2017 by contractual maturity are shown below (in thousands). Expected maturities of mortgage-backed securities will differ from contractual maturities because borrowers may have the right to prepay obligations with or without call or prepayment penalties. Corporate equity securities are not included in the maturity categories in the following maturity summary because they do not have a stated maturity date. Available for Sale Held to Maturity Amortized Fair Amortized Fair Due within one year $ 1,075 $ 1,077 $ — $ — Due after one year through five years 14,229 14,244 1,773 1,786 Due after five years through ten years 12,185 12,109 18,806 18,770 Due after ten years 65,144 64,466 31,420 31,052 Corporate equity securities 1 11 — — $ 92,634 $ 91,907 $ 51,999 $ 51,608
Composition of Restricted Securities	The composition of restricted securities at March 31, 2017 and December 31, 2016 was as follows (in thousands): March 31, December 31, Federal Home Loan Bank stock $ 645 $ 623 Federal Reserve Bank stock 875 875 Community Bankers’ Bank stock 50 50 $ 1,570 $ 1,548

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Summary of Loans	Loans at March 31, 2017 and December 31, 2016 are summarized as follows (in thousands): March 31, December 31, Real estate loans: Construction and land development $ 36,024 $ 34,699 Secured by 1-4 205,623 198,763 Other real estate loans 216,591 211,210 Commercial and industrial loans 29,192 29,981 Consumer and other loans 10,340 11,414 Total loans $ 497,770 $ 486,067 Allowance for loan losses (5,451 ) (5,321 ) Loans, net $ 492,319 $ 480,746
Summary of Loan Classes and an Aging of Past Due Loans	The following tables provide a summary of loan classes and an aging of past due loans as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 30-59 60-89 > 90 Total Current Total Non-accrual 90 Days Real estate loans: Construction and land development $ 504 $ 41 $ — $ 545 $ 35,479 $ 36,024 $ 1,134 $ — Secured by 1-4 678 494 149 1,321 204,302 205,623 389 33 Other real estate loans 254 538 86 878 215,713 216,591 73 86 Commercial and industrial — 26 — 26 29,166 29,192 — — Consumer and other loans 40 31 — 71 10,269 10,340 — — Total $ 1,476 $ 1,130 $ 235 $ 2,841 $ 494,929 $ 497,770 $ 1,596 $ 119 December 31, 2016 30-59 60-89 > 90 Total Current Total Non-accrual 90 Days Real estate loans: Construction and land development $ — $ 40 $ — $ 40 $ 34,659 $ 34,699 $ 1,033 $ — Secured by 1-4 980 170 410 1,560 197,203 198,763 413 84 Other real estate loans 321 701 — 1,022 210,188 211,210 74 — Commercial and industrial 36 309 32 377 29,604 29,981 — 32 Consumer and other loans 19 7 — 26 11,388 11,414 — — Total $ 1,356 $ 1,227 $ 442 $ 3,025 $ 483,042 $ 486,067 $ 1,520 $ 116
Analysis of the Credit Risk Profile of Each Loan Class	The following tables provide an analysis of the credit risk profile of each loan class as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Pass Special Substandard Doubtful Total Real estate loans: Construction and land development $ 30,522 $ 2,267 $ 3,235 $ — $ 36,024 Secured by 1-4 200,347 3,319 1,957 — 205,623 Other real estate loans 205,504 6,933 4,154 — 216,591 Commercial and industrial 28,689 377 126 — 29,192 Consumer and other loans 10,340 — — — 10,340 Total $ 475,402 $ 12,896 $ 9,472 $ — $ 497,770 December 31, 2016 Pass Special Substandard Doubtful Total Real estate loans: Construction and land development $ 29,416 $ 2,402 $ 2,881 $ — $ 34,699 Secured by 1-4 193,395 3,295 2,073 — 198,763 Other real estate loans 200,009 6,990 4,211 — 211,210 Commercial and industrial 29,456 386 139 — 29,981 Consumer and other loans 11,414 — — — 11,414 Total $ 463,690 $ 13,073 $ 9,304 $ — $ 486,067

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Allowance by Impairment Methodology and Loans by Impairment Methodology	The following tables present, as of March 31, 2017, December 31, 2016 and March 31, 2016, the total allowance for loan losses, the allowance by impairment methodology and loans by impairment methodology (in thousands): March 31, 2017 Construction Secured by 1-4 Other Real Commercial Consumer Total Allowance for loan losses: Beginning Balance, December 31, 2016 $ 441 $ 1,019 $ 3,142 $ 380 $ 339 $ 5,321 Charge-offs — — — — (106 ) (106 ) Recoveries 1 128 47 5 55 236 Provision for (recovery of) loan losses 39 (187 ) 78 (10 ) 80 — Ending Balance, March 31, 2017 $ 481 $ 960 $ 3,267 $ 375 $ 368 $ 5,451 Ending Balance: Individually evaluated for impairment — 31 — — — 31 Collectively evaluated for impairment 481 929 3,267 375 368 5,420 Loans: Ending Balance $ 36,024 $ 205,623 $ 216,591 $ 29,192 $ 10,340 $ 497,770 Individually evaluated for impairment 2,022 1,443 977 71 — 4,513 Collectively evaluated for impairment 34,002 204,180 215,614 29,121 10,340 493,257 December 31, 2016 Construction Secured by 1-4 Other Real Commercial Consumer Total Allowance for loan losses: Beginning Balance, December 31, 2015 $ 1,532 $ 939 $ 2,534 $ 306 $ 213 $ 5,524 Charge-offs — (83 ) (165 ) — (540 ) (788 ) Recoveries 4 293 2 11 275 585 Provision for (recovery of) loan losses (1,095 ) (130 ) 771 63 391 — Ending Balance, December 31, 2016 $ 441 $ 1,019 $ 3,142 $ 380 $ 339 $ 5,321 Ending Balance: Individually evaluated for impairment — 37 — — — 37 Collectively evaluated for impairment 441 982 3,142 380 339 5,284 Loans: Ending Balance $ 34,699 $ 198,763 $ 211,210 $ 29,981 $ 11,414 $ 486,067 Individually evaluated for impairment 1,973 1,828 984 75 — 4,860 Collectively evaluated for impairment 32,726 196,935 210,226 29,906 11,414 481,207 March 31, 2016 Construction Secured by 1-4 Other Real Commercial Consumer Total Allowance for loan losses: Beginning Balance, December 31, 2015 $ 1,532 $ 939 $ 2,534 $ 306 $ 213 $ 5,524 Charge-offs — (2 ) — — (118 ) (120 ) Recoveries 1 9 — 3 103 116 Provision for (recovery of) loan losses (163 ) 38 117 (12 ) 20 — Ending Balance, March 31, 2016 $ 1,370 $ 984 $ 2,651 $ 297 $ 218 $ 5,520 Ending Balance: Individually evaluated for impairment 222 22 190 — — 434 Collectively evaluated for impairment 1,148 962 2,461 297 218 5,086 Loans: Ending Balance $ 31,505 $ 196,165 $ 191,306 $ 24,215 $ 10,885 $ 454,076 Individually evaluated for impairment 2,675 2,062 2,990 89 — 7,816 Collectively evaluated for impairment 28,830 194,103 188,316 24,126 10,885 446,260
Impaired Loans and Related Allowance	Impaired loans and the related allowance at March 31, 2017, December 31, 2016 and March 31, 2016, were as follows (in thousands): March 31, 2017 Unpaid Recorded Recorded Total Related Average Interest Real estate loans: Construction and land development $ 2,455 $ 2,022 $ — $ 2,022 $ — $ 1,922 $ 13 Secured by 1-4 1,469 1,358 85 1,443 31 1,781 16 Other real estate loans 1,206 977 — 977 — 980 19 Commercial and industrial 89 71 — 71 — 73 1 Total $ 5,219 $ 4,428 $ 85 $ 4,513 $ 31 $ 4,756 $ 49 December 31, 2016 Unpaid Recorded Recorded Total Related Average Interest Real estate loans: Construction and land development $ 2,388 $ 1,973 $ — $ 1,973 $ — $ 2,407 $ 66 Secured by 1-4 1,851 1,675 153 1,828 37 2,013 87 Other real estate loans 1,213 984 — 984 — 2,529 22 Commercial and industrial 93 75 — 75 — 85 1 Total $ 5,545 $ 4,707 $ 153 $ 4,860 $ 37 $ 7,034 $ 176 March 31, 2016 Unpaid Recorded Recorded Total Related Average Interest Real estate loans: Construction and land development $ 2,897 $ 2,253 $ 422 $ 2,675 $ 222 $ 2,593 $ 16 Secured by 1-4 2,136 2,040 22 2,062 22 2,059 24 Other real estate loans 3,549 2,436 554 2,990 190 3,069 8 Commercial and industrial 104 89 — 89 — 92 — Total $ 8,686 $ 6,818 $ 998 $ 7,816 $ 434 $ 7,813 $ 48

Other Real Estate Owned (OREO)

Other Real Estate Owned (OREO) (Tables)	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Summary of Changes in the Balance for OREO	Changes in the balance for OREO are as follows (in thousands): For the three months ended For the year ended March 31, December 31, 2017 2016 Balance at the beginning of year, gross $ 250 $ 2,903 Transfers in — 287 Charge-offs — (251 ) Sales proceeds — (2,882 ) Gain on disposition — 193 Balance at the end of period, gross $ 250 $ 250 Less: valuation allowance — — Balance at the end of period, net $ 250 $ 250
Summary of Changes in the Valuation Allowance	Changes in the valuation allowance are as follows (in thousands): For the three months ended For the year ended March 31, March 31, December 31, 2017 2016 2016 Balance at beginning of year $ — $ 224 $ 224 Provision for losses — — 27 Charge-offs, net — (70 ) (251 ) Balance at end of period $ — $ 154 $ —

Capital Requirements (Tables)

Capital Requirements (Tables)	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Comparison of Capital of Company and Bank with Minimum Regulatory Guidelines	A comparison of the capital of the Bank at March 31, 2017 and December 31, 2016 with the minimum regulatory guidelines were as follows (dollars in thousands): Minimum To Be Well Capitalized Under Minimum Capital Prompt Corrective Actual Requirement Action Provisions Amount Ratio Amount Ratio Amount Ratio March 31, 2017: Total Capital (to Risk-Weighted Assets) $ 67,264 13.53 % $ 39,769 8.00 % $ 49,711 10.00 % Tier 1 Capital (to Risk-Weighted Assets) $ 61,813 12.43 % $ 29,827 6.00 % $ 39,769 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 61,813 12.43 % $ 22,370 4.50 % $ 32,312 6.50 % Tier 1 Capital (to Average Assets) $ 61,813 8.66 % $ 28,539 4.00 % $ 35,674 5.00 % December 31, 2016: Total Capital (to Risk-Weighted Assets) $ 65,590 13.47 % $ 38,951 8.00 % $ 48,689 10.00 % Tier 1 Capital (to Risk-Weighted Assets) $ 60,269 12.38 % $ 29,213 6.00 % $ 38,951 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) $ 60,269 12.38 % $ 21,910 4.50 % $ 31,648 6.50 % Tier 1 Capital (to Average Assets) $ 60,269 8.48 % $ 28,432 4.00 % $ 35,540 5.00 %

Benefit Plans (Tables)

Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Components of Net Periodic Benefit Cost	Components of the net periodic benefit cost of the plan for the three months ended March 31, 2017 and 2016 were as follows (in thousands): For the three months ended March 31, 2017 2016 Service cost $ — $ 102 Interest cost 21 83 Expected return on plan assets (9 ) (74 ) Recognized net actuarial loss — 21 Net periodic benefit cost $ 12 $ 132

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table presents the computation of basic and diluted earnings per share for the three months ended March 31, 2017 and 2016 (dollars in thousands, except per share data): For the three months ended March 31, March 31, (Numerator): Net income $ 1,543 $ 1,099 (Denominator): Weighted average shares outstanding – basic 4,935,421 4,920,315 Potentially dilutive common shares – restricted stock units 2,204 2,802 Weighted average shares outstanding – diluted 4,937,625 4,923,117 Income per common share Basic $ 0.31 $ 0.22 Diluted $ 0.31 $ 0.22

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Balances of Assets Measured at Fair Value on a Recurring Basis	The following tables present the balances of assets measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 (in thousands). Fair Value Measurements at March 31, 2017 Description Balance as of Quoted Significant Significant Securities available for sale U.S. agency and mortgage-backed securities $ 77,227 $ — $ 77,227 $ — Obligations of states and political subdivisions 14,669 — 14,669 — Corporate equity securities 11 11 — — $ 91,907 $ 11 $ 91,896 $ — Fair Value Measurements at December 31, 2016 Description Balance as of Quoted Significant Significant Securities available for sale U.S. agency and mortgage-backed securities $ 80,171 $ — $ 80,171 $ — Obligations of states and political subdivisions 14,620 — 14,620 — Corporate equity securities 11 11 — — $ 94,802 $ 11 $ 94,791 $ —
Summary of Assets Measured at Fair Value on a Nonrecurring Basis	The following tables summarize the Company’s assets that were measured at fair value on a nonrecurring basis during the periods (dollars in thousands): Fair Value Measurements at March 31, 2017 Description Balance as of Quoted Significant Significant Impaired loans, net $ 54 $ — $ — $ 54 Other real estate owned 250 — — 250 Fair Value Measurements at December 31, 2016 Description Balance as of Quoted Significant Significant Impaired loans, net $ 116 $ — $ — $ 116 Other real estate owned 250 — — 250
Quantitative Information about Level 3 Fair Value Measurements	Quantitative information about Level 3 Fair Value Measurements for March 31, 2017 Fair Value Valuation Technique Unobservable Input Range (Weighted-Average) Impaired loans, net $ 54 Property appraisals Selling cost 10 % Other real estate owned $ 250 Property appraisals Selling cost 0 % Quantitative information about Level 3 Fair Value Measurements for December 31, 2016 Fair Value Valuation Technique Unobservable Input Range Impaired loans, net $ 116 Property appraisals Selling cost 10 % Other real estate owned $ 250 Property appraisals Selling cost 0 %
Carrying Values and Estimated Fair Values of Company's Financial Instruments	The carrying values and estimated fair values of the Company’s financial instruments at March 31, 2017 and December 31, 2016 are as follows (in thousands): Fair Value Measurements at March 31, 2017 Using Carrying Quoted Significant Significant Fair Value Financial Assets Cash and short-term investments $ 45,839 $ 45,839 $ — $ — $ 45,839 Securities available for sale 91,907 11 91,896 — 91,907 Securities held to maturity 51,999 — 50,124 1,484 51,608 Restricted securities 1,570 — 1,570 — 1,570 Loans, net 492,319 — — 492,578 492,578 Bank owned life insurance 14,013 — 14,013 — 14,013 Accrued interest receivable 1,753 — 1,753 — 1,753 Financial Liabilities Deposits $ 654,769 $ — $ 527,921 $ 125,608 $ 653,529 Subordinated debt 4,934 — — 4,709 4,709 Junior subordinated debt 9,279 — — 9,175 9,175 Accrued interest payable 88 — 88 — 88 Fair Value Measurements at December 31, 2016 Using Carrying Quoted Significant Significant Fair Value Financial Assets Cash and short-term investments $ 41,092 $ 41,092 $ — $ — $ 41,092 Securities available for sale 94,802 11 94,791 — 94,802 Securities held to maturity 53,398 — 51,223 1,486 52,709 Restricted securities 1,548 — 1,548 — 1,548 Loans held for sale 337 — 337 — 337 Loans, net 480,746 — — 481,475 481,475 Bank owned life insurance 13,928 — 13,928 — 13,928 Accrued interest receivable 1,746 — 1,746 — 1,746 Financial Liabilities Deposits $ 645,570 $ — $ 517,143 $ 127,179 $ 644,322 Subordinated debt 4,930 — — 4,715 4,715 Junior subordinated debt 9,279 — — 9,075 9,075 Accrued interest payable 95 — 95 — 95

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Restricted Stock Units	A summary of the activity for the Company’s restricted stock units for the period indicated is presented in the following table: March 31, 2017 Shares Weighted Unvested, beginning of period 10,259 $ 8.88 Granted 3,939 15.20 Vested (8,536 ) 9.89 Forfeited — — Unvested, end of period 5,662 $ 11.76

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Schedule of Changes in Component of Accumulated Other Comprehensive Loss	Changes in each component of accumulated other comprehensive loss were as follows (in thousands): Net Adjustments Accumulated Balance at December 31, 2015 $ (192 ) $ (1,396 ) $ (1,588 ) Unrealized holding gains (net of tax, $387) 749 — 749 Reclassification adjustment (net of tax, ($2)) (4 ) — (4 ) Change during period 745 — 745 Balance at March 31, 2016 $ 553 $ (1,396 ) $ (843 ) Balance at December 31, 2016 $ (860 ) $ — $ (860 ) Unrealized holding gains (net of tax, $196) 381 — 381 Change during period 381 — 381 Balance at March 31, 2017 $ (479 ) $ — $ (479 )
Reclassifications from Accumulated Other Comprehensive Loss	The following tables present information related to reclassifications from accumulated other comprehensive loss for the three month periods ended March 31, 2017 and 2016 (in thousands). Details About Accumulated Other Comprehensive Loss Amount Reclassified from Affected Line Item in the Consolidated Statements of Income For the three months ended March 31 2017 2016 Securities available for sale: Net securities gains reclassified into earnings $ — $ (6 ) Net gains on calls and sales of securities available for sale Related income tax expense — 2 Income tax expense Total reclassifications $ — $ (4 ) Net of tax

General - Additional Informatio

General - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Accounting Policies [Abstract]
Excess tax benefits on stock-based compensation	$ 14

Securities - Summary of Amortiz

Securities - Summary of Amortized Costs and Fair Values of Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	$ 92,634	$ 96,106
Securities available for sale, Gross Unrealized Gains	394	333
Securities available for sale, Gross Unrealized (Losses)	(1,121)	(1,637)
Securities available for sale, Fair Value	91,907	94,802	[1]
Securities held to maturity, Amortized Cost	51,999	53,398
Securities held to maturity, Gross Unrealized Gains	69	19
Securities held to maturity, Gross Unrealized (Losses)	(460)	(708)
Securities held to maturity, Fair Value	51,608	52,709	[1]
Total securities, Amortized Cost	144,633	149,504
Total securities, Gross Unrealized Gains	463	352
Total securities, Gross Unrealized (Losses)	(1,581)	(2,345)
Total securities, Fair Value	143,515	147,511
U.S. Agency and Mortgage-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	78,026	81,451
Securities available for sale, Gross Unrealized Gains	186	177
Securities available for sale, Gross Unrealized (Losses)	(985)	(1,457)
Securities available for sale, Fair Value	77,227	80,171
Securities held to maturity, Amortized Cost	35,888	37,269
Securities held to maturity, Gross Unrealized Gains	20	1
Securities held to maturity, Gross Unrealized (Losses)	(351)	(483)
Securities held to maturity, Fair Value	35,557	36,787
Obligations of States and Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	14,607	14,654
Securities available for sale, Gross Unrealized Gains	198	146
Securities available for sale, Gross Unrealized (Losses)	(136)	(180)
Securities available for sale, Fair Value	14,669	14,620
Securities held to maturity, Amortized Cost	14,611	14,629
Securities held to maturity, Gross Unrealized Gains	49	18
Securities held to maturity, Gross Unrealized (Losses)	(93)	(211)
Securities held to maturity, Fair Value	14,567	14,436
Corporate Equity Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	1	1
Securities available for sale, Gross Unrealized Gains	10	10
Securities available for sale, Fair Value	11	11
Corporate Debt Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	1,500	1,500
Securities held to maturity, Gross Unrealized (Losses)	(16)	(14)
Securities held to maturity, Fair Value	$ 1,484	$ 1,486
[1]	Derived from audited consolidated financial statements.

Securities - Summary of Investm

Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months - Fair Value	$ 55,987	$ 66,073
Securities available for sale, 12 months or more - Fair Value	5,190	5,499
Securities available for sale, Total - Fair Value	61,177	71,572
Securities available for sale, Less than 12 months - Unrealized (Loss)	(933)	(1,429)
Securities available for sale, 12 months or more - Unrealized (Loss)	(188)	(208)
Total Unrealized (Loss)	(1,121)	(1,637)
Securities held to maturity, Less than 12 months - Fair Value	37,022	48,980
Securities held to maturity, 12 months or more - Fair Value	0	0
Securities held to maturity, Total - Fair Value	37,022	48,980
Securities held to maturity, Less than 12 months - Unrealized (Loss)	(460)	(708)
Securities held to maturity, 12 months or more - Unrealized (Loss)	0	0
Total Unrealized (Loss)	(460)	(708)
Total securities, Less than 12 months - Fair Value	93,009	115,053
Total securities, 12 months or more - Fair Value	5,190	5,499
Total securities, Total - Fair Value	98,199	120,552
Total securities, Less than 12 months - Unrealized (Loss)	(1,393)	(2,137)
Total securities, 12 months or more - Unrealized (Loss)	(188)	(208)
Total Unrealized (Loss)	(1,581)	(2,345)
U.S. Agency and Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months - Fair Value	52,461	60,943
Securities available for sale, 12 months or more - Fair Value	5,190	5,499
Securities available for sale, Total - Fair Value	57,651	66,442
Securities available for sale, Less than 12 months - Unrealized (Loss)	(797)	(1,249)
Securities available for sale, 12 months or more - Unrealized (Loss)	(188)	(208)
Total Unrealized (Loss)	(985)	(1,457)
Securities held to maturity, Less than 12 months - Fair Value	26,783	34,770
Securities held to maturity, 12 months or more - Fair Value	0	0
Securities held to maturity, Total - Fair Value	26,783	34,770
Securities held to maturity, Less than 12 months - Unrealized (Loss)	(351)	(483)
Securities held to maturity, 12 months or more - Unrealized (Loss)	0	0
Total Unrealized (Loss)	(351)	(483)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Less than 12 months - Fair Value	3,526	5,130
Securities available for sale, Total - Fair Value	3,526	5,130
Securities available for sale, Less than 12 months - Unrealized (Loss)	(136)	(180)
Total Unrealized (Loss)	(136)	(180)
Securities held to maturity, Less than 12 months - Fair Value	8,755	12,724
Securities held to maturity, 12 months or more - Fair Value	0	0
Securities held to maturity, Total - Fair Value	8,755	12,724
Securities held to maturity, Less than 12 months - Unrealized (Loss)	(93)	(211)
Securities held to maturity, 12 months or more - Unrealized (Loss)	0	0
Total Unrealized (Loss)	(93)	(211)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities held to maturity, Less than 12 months - Fair Value	1,484	1,486
Securities held to maturity, 12 months or more - Fair Value	0	0
Securities held to maturity, Total - Fair Value	1,484	1,486
Securities held to maturity, Less than 12 months - Unrealized (Loss)	(16)	(14)
Securities held to maturity, 12 months or more - Unrealized (Loss)	0	0
Total Unrealized (Loss)	$ (16)	$ (14)

Securities - Additional Informa

Securities - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)Securities	Dec. 31, 2016Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of investment portfolio	100.00%	100.00%
Weighted-average period of re-pricing of portfolio	4 years 6 months	4 years 8 months 12 days
Impairment recognized | $	$ 0
U.S. Agency and Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in an unrealized loss position	54	64
Total number of securities	83	83
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in an unrealized loss position	33	50
Total number of securities	78	78
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in an unrealized loss position	1	1

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost and Fair Value Debt Securities [Abstract]
Due within one year, Available for Sale Amortized Cost	$ 1,075
Due after one year through five years, Available for Sale Amortized Cost	14,229
Due after five years through ten years, Available for Sale Amortized Cost	12,185
Due after ten years, Available for Sale Amortized Cost	65,144
Corporate equity securities, Available for Sale Amortized Cost	1
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total	92,634	$ 96,106
Due within one year, Available for Sale Fair Value	1,077
Due after one year through five years, Available for Sale Fair Value	14,244
Due after five years through ten years, Available for Sale Fair Value	12,109
Due after ten years, Available for Sale Fair Value	64,466
Corporate equity securities, Available for Sale Fair Value	11
Available for Sale Securities, Debt and Equity, Fair Value, Total	91,907	94,802	[1]
Due within one year, Held to Maturity Amortized Cost	0
Due after one year through five years, Held to Maturity Amortized Cost	1,773
Due after five years through ten years, Held to Maturity Amortized Cost	18,806
Due after ten years, Held to Maturity Amortized Cost	31,420
Corporate equity securities, Held to Maturity Amortized Cost	0
Held to Maturity Amortized Cost, Total	51,999	53,398	[1]
Due within one year, Held to Maturity Fair Value	0
Due after one year through five years, Held to Maturity Fair Value	1,786
Due after five years through ten years, Held to Maturity Fair Value	18,770
Due after ten years, Held to Maturity Fair Value	31,052
Corporate equity securities, Held to Maturity Fair Value	0
Held to Maturity Fair Value, Total	$ 51,608	$ 52,709	[1]
[1]	Derived from audited consolidated financial statements.

Securities - Composition of Res

Securities - Composition of Restricted Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank Stock and Federal Reserve Bank Stock [Abstract]
Federal Home Loan Bank stock	$ 645	$ 623
Federal Reserve Bank stock	875	875
Community Bankers' Bank stock	50	50
Total Restricted Securities	$ 1,570	$ 1,548	[1]
[1]	Derived from audited consolidated financial statements.

Loans - Summary of Loans (Detai

Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016		Mar. 31, 2016	Jan. 01, 2016
Real estate loans:
Loans	$ 497,770	$ 486,067		$ 454,076
Allowance for loan losses	(5,451)	(5,321)	[1]	(5,520)	$ (5,524)
Loans, net	492,319	480,746	[1]
Construction and Land Development [Member]
Real estate loans:
Loans	36,024	34,699		31,505
Allowance for loan losses	(481)	(441)		(1,370)	(1,532)
Secured by 1-4 Family Residential [Member]
Real estate loans:
Loans	205,623	198,763		196,165
Allowance for loan losses	(960)	(1,019)		(984)	(939)
Other Real Estate Loans [Member]
Real estate loans:
Loans	216,591	211,210
Commercial and Industrial [Member]
Real estate loans:
Loans	29,192	29,981		24,215
Allowance for loan losses	(375)	(380)		(297)	(306)
Consumer and Other Loans [Member]
Real estate loans:
Loans	10,340	11,414		10,885
Allowance for loan losses	$ (368)	$ (339)		$ (218)	$ (213)
[1]	Derived from audited consolidated financial statements.

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Net deferred loan fees and costs	$ 221	$ 142
Total loans	497,770	486,067	$ 454,076
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,340	11,414	$ 10,885
Consumer and Other Loans [Member] | Demand Deposit Overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 199	$ 264

Loans - Summary of Loan Classes

Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	$ 2,841	$ 3,025
Current	494,929	483,042
Total loans	497,770	486,067	$ 454,076
Non- accrual Loans	1,596	1,520
90 Days or More Past Due and Accruing	119	116
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	545	40
Current	35,479	34,659
Total loans	36,024	34,699	31,505
Non- accrual Loans	1,134	1,033
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	1,321	1,560
Current	204,302	197,203
Total loans	205,623	198,763	196,165
Non- accrual Loans	389	413
90 Days or More Past Due and Accruing	33	84
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	878	1,022
Current	215,713	210,188
Total loans	216,591	211,210
Non- accrual Loans	73	74
90 Days or More Past Due and Accruing	86
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	26	377
Current	29,166	29,604
Total loans	29,192	29,981	24,215
90 Days or More Past Due and Accruing		32
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	71	26
Current	10,269	11,388
Total loans	10,340	11,414	$ 10,885
30 - 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	1,476	1,356
30 - 59 Days Past Due [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	504
30 - 59 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	678	980
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	254	321
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due		36
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	40	19
60 - 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	1,130	1,227
60 - 89 Days Past Due [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	41	40
60 - 89 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	494	170
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	538	701
60 - 89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	26	309
60 - 89 Days Past Due [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	31	7
> 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	235	442
> 90 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	149	410
> 90 Days Past Due [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	$ 86
> 90 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due		$ 32

Loans - Analysis of the Credit

Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total	$ 497,770	$ 486,067	$ 454,076
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	36,024	34,699	31,505
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	205,623	198,763	196,165
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	216,591	211,210
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	29,192	29,981	24,215
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,340	11,414	$ 10,885
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	475,402	463,690
Pass [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	30,522	29,416
Pass [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	200,347	193,395
Pass [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	205,504	200,009
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	28,689	29,456
Pass [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,340	11,414
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,896	13,073
Special Mention [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,267	2,402
Special Mention [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,319	3,295
Special Mention [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,933	6,990
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	377	386
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	9,472	9,304
Substandard [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,235	2,881
Substandard [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,957	2,073
Substandard [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,154	4,211
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 126	$ 139

Allowance for Loan Losses - All

Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2017		Mar. 31, 2016	Dec. 31, 2016
Allowance for loan losses:
Beginning Balance	$ 5,321	[1]	$ 5,524	$ 5,524
Charge-offs	(106)		(120)	(788)
Recoveries	236		116	585
Provision for (recovery of) loan losses	0		0
Ending Balance	5,451		5,520	5,321	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	31		434	37
Allowance for loan losses, Collectively evaluated for impairment	5,420		5,086	5,284
Loans:
Ending Balance	497,770		454,076	486,067
Loans, Individually evaluated for impairment	4,513		7,816	4,860
Loans, Collectively evaluated for impairment	493,257		446,260	481,207
Construction and Land Development [Member]
Allowance for loan losses:
Beginning Balance	441		1,532	1,532
Recoveries	1		1	4
Provision for (recovery of) loan losses	39		(163)	(1,095)
Ending Balance	481		1,370	441
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment			222
Allowance for loan losses, Collectively evaluated for impairment	481		1,148	441
Loans:
Ending Balance	36,024		31,505	34,699
Loans, Individually evaluated for impairment	2,022		2,675	1,973
Loans, Collectively evaluated for impairment	34,002		28,830	32,726
Secured by 1-4 Family Residential [Member]
Allowance for loan losses:
Beginning Balance	1,019		939	939
Charge-offs			(2)	(83)
Recoveries	128		9	293
Provision for (recovery of) loan losses	(187)		38	(130)
Ending Balance	960		984	1,019
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	31		22	37
Allowance for loan losses, Collectively evaluated for impairment	929		962	982
Loans:
Ending Balance	205,623		196,165	198,763
Loans, Individually evaluated for impairment	1,443		2,062	1,828
Loans, Collectively evaluated for impairment	204,180		194,103	196,935
Other Real Estate [Member]
Allowance for loan losses:
Beginning Balance	3,142		2,534	2,534
Charge-offs				(165)
Recoveries	47			2
Provision for (recovery of) loan losses	78		117	771
Ending Balance	3,267		2,651	3,142
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment			190
Allowance for loan losses, Collectively evaluated for impairment	3,267		2,461	3,142
Loans:
Ending Balance	216,591		191,306	211,210
Loans, Individually evaluated for impairment	977		2,990	984
Loans, Collectively evaluated for impairment	215,614		188,316	210,226
Commercial and Industrial [Member]
Allowance for loan losses:
Beginning Balance	380		306	306
Recoveries	5		3	11
Provision for (recovery of) loan losses	(10)		(12)	63
Ending Balance	375		297	380
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	375		297	380
Loans:
Ending Balance	29,192		24,215	29,981
Loans, Individually evaluated for impairment	71		89	75
Loans, Collectively evaluated for impairment	29,121		24,126	29,906
Consumer and Other Loans [Member]
Allowance for loan losses:
Beginning Balance	339		213	213
Charge-offs	(106)		(118)	(540)
Recoveries	55		103	275
Provision for (recovery of) loan losses	80		20	391
Ending Balance	368		218	339
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	368		218	339
Loans:
Ending Balance	10,340		10,885	11,414
Loans, Collectively evaluated for impairment	$ 10,340		$ 10,885	$ 11,414
[1]	Derived from audited consolidated financial statements.

Allowance for Loan losses - Imp

Allowance for Loan losses - Impaired Loans and Related Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 5,219	$ 8,686	$ 5,545
Recorded Investment with No Allowance	4,428	6,818	4,707
Recorded Investment with Allowance	85	998	153
Total Recorded Investment	4,513	7,816	4,860
Related Allowance	31	434	37
Average Recorded Investment	4,756	7,813	7,034
Interest Income Recognized	49	48	176
Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,455	2,897	2,388
Recorded Investment with No Allowance	2,022	2,253	1,973
Recorded Investment with Allowance		422
Total Recorded Investment	2,022	2,675	1,973
Related Allowance		222
Average Recorded Investment	1,922	2,593	2,407
Interest Income Recognized	13	16	66
Secured by 1-4 Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,469	2,136	1,851
Recorded Investment with No Allowance	1,358	2,040	1,675
Recorded Investment with Allowance	85	22	153
Total Recorded Investment	1,443	2,062	1,828
Related Allowance	31	22	37
Average Recorded Investment	1,781	2,059	2,013
Interest Income Recognized	16	24	87
Other Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,206	3,549	1,213
Recorded Investment with No Allowance	977	2,436	984
Recorded Investment with Allowance		554
Total Recorded Investment	977	2,990	984
Related Allowance		190
Average Recorded Investment	980	3,069	2,529
Interest Income Recognized	19	8	22
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	89	104	93
Recorded Investment with No Allowance	71	89	75
Total Recorded Investment	71	89	75
Average Recorded Investment	73	$ 92	85
Interest Income Recognized	$ 1		$ 1

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017USD ($)Contracts	Mar. 31, 2016USD ($)Contracts	Dec. 31, 2016USD ($)
Allowance For Loan Losses [Line Items]
TDRs performing under the restructured terms	$ 454,000		$ 460,000
Loans modified under TDRs | Contracts	0	0
Troubled debt restructuring loan subsequent default	$ 0	$ 0
Troubled debt restructuring loan subsequent default period	90 days
Performing Financing Receivable [Member]
Allowance For Loan Losses [Line Items]
TDRs performing under the restructured terms	$ 296,000		$ 300,000

Other Real Estate Owned (OREO48

Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Real Estate [Abstract]
Balance at the beginning of year, gross	$ 250	$ 2,903
Transfers in		287
Charge-offs		(251)
Sales proceeds		(2,882)
Gain on disposition		193
Balance at the end of period, gross	250	250
Less: valuation allowance	0	0
Balance at the end of period, net	$ 250	$ 250	[1]
[1]	Derived from audited consolidated financial statements.

Other Real Estate Owned (OREO49

Other Real Estate Owned (OREO) - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jan. 01, 2016
Other Real Estate [Line Items]
Residential real estate carrying amount included in OREO	$ 250,000		$ 250,000	$ 2,903,000
Net expenses applicable to other real estate owned	2,000	$ 22,000	46,000
Residential Real Estate Properties [Member]
Other Real Estate [Line Items]
Residential real estate carrying amount included in OREO	0		$ 0
Mortgage loans foreclosed	$ 0

Other Real Estate Owned (OREO50

Other Real Estate Owned (OREO) - Summary of Changes in the Valuation Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016
Real Estate [Abstract]
Balance at beginning of year	$ 224	$ 224
Provision for losses		27
Charge-offs, net	(70)	(251)
Balance at end of period	$ 154	$ 0	[1]
[1]	Derived from audited consolidated financial statements.

Other Borrowings - Additional I

Other Borrowings - Additional Information (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unused lines of credit	$ 131,000,000	$ 125,600,000
Blanket floating lien agreement	19.00%
Collateral pledged on borrowings including real estate loans	$ 102,500,000	103,900,000
FHLB stock book value	645,000	623,000
Borrowings from FHLB	0	$ 0
FHLB [Member]
Debt Instrument [Line Items]
Unused lines of credit	$ 80,400,000

Capital Requirements - Addition

Capital Requirements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer period	4 years
Capital conservation buffer percentage	1.25%			0.625%	0.625%	0.625%
Capital conservation buffer percentage maintained at bank	5.53%				5.47%
Scenario, Forecast [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer percentage		0.625%	0.625%

Capital Requirements - Comparis

Capital Requirements - Comparison of Capital of Company and Bank with Minimum Regulatory Guidelines (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
Actual Amount Total Capital (to Risk Weighted Assets)	$ 67,264	$ 65,590
Actual Ratio Total Capital (to Risk Weighted Assets)	13.53%	13.47%
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets)	$ 39,769	$ 38,951
Minimum Capital Requirement Ratio Total Capital (to Risk Weighted Assets)	8.00%	8.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Total Capital (to Risk Weighted Assets)	$ 49,711	$ 48,689
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Total Capital (to Risk Weighted Assets)	10.00%	10.00%
Actual Amount Tier 1 Capital (to Risk Weighted Assets)	$ 61,813	$ 60,269
Actual Ratio Tier 1 Capital (to Risk Weighted Assets)	12.43%	12.38%
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets)	$ 29,827	$ 29,213
Minimum Capital Requirement Ratio Tier 1 Capital (to Risk Weighted Assets)	6.00%	6.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Risk Weighted Assets)	$ 39,769	$ 38,951
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Risk Weighted Assets)	8.00%	8.00%
Actual Amount Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 61,813	$ 60,269
Actual Ratio Common Equity Tier 1 Capital (to Risk Weighted Assets)	12.43%	12.38%
Minimum Capital Requirement Amount Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 22,370	$ 21,910
Minimum Capital Requirement Ratio Common Equity Tier 1 Capital (to Risk Weighted Assets)	4.50%	4.50%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Common Equity Tier 1 Capital (to Risk Weighted Assets)	$ 32,312	$ 31,648
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Common Equity Tier 1 Capital (to Risk Weighted Assets)	6.50%	6.50%
Actual Amount Tier 1 Capital (to Average Assets)	$ 61,813	$ 60,269
Actual Ratio Tier 1 Capital (to Average Assets)	8.66%	8.48%
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets)	$ 28,539	$ 28,432
Minimum Capital Requirement Ratio Tier 1 Capital (to Average Assets)	4.00%	4.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Average Assets)	$ 35,674	$ 35,540
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Average Assets)	5.00%	5.00%

Subordinated Debt - Additional

Subordinated Debt - Additional Information (Detail) - USD ($) $ in Thousands	Oct. 30, 2015	Mar. 31, 2017	Dec. 31, 2016
6.75% Fixed Interest Subordinate Term Note [Member]
Subordinated Borrowing [Line Items]
Aggregate principal amount	$ 5,000
Fixed interest rate	6.75%
Unsecured Debt [Member]
Subordinated Borrowing [Line Items]
Debt instrument maturity date	Oct. 1, 2025
Debt instrument prepay date	Oct. 30, 2020
Unsecured Debt [Member] | 6.75% Fixed Interest Subordinate Term Note [Member]
Subordinated Borrowing [Line Items]
Unamortized debt issuance costs		$ 66	$ 70

Junior Subordinated Debt - Addi

Junior Subordinated Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
First National (VA) Statutory Trust III [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Formation of wholly-owned subsidiary	Jul. 24, 2006
Preferred securities issued through pooled underwriting date	Jul. 31, 2006
Issuance of trust preferred securities	$ 4
LIBOR-indexed floating rate of interest	2.60%	2.45%
Junior subordinated debt	$ 4.1
Securities mandatory redemption date	Oct. 1, 2036
Maximum capital required for capital adequacy	25.00%
First National (VA) Statutory Trust II [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Formation of wholly-owned subsidiary	Jun. 8, 2004
Preferred securities issued through pooled underwriting date	Jun. 17, 2004
Issuance of trust preferred securities	$ 5
LIBOR-indexed floating rate of interest	3.75%	3.59%
Junior subordinated debt	$ 5.2
Securities mandatory redemption date	Jun. 17, 2034

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of highest-paid consecutive years for benefits	5 years
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum eligibility for full-time employees, age	21 years
Amount contributed to pension plan, Expected in future	$ 2.1
Defined Benefit Pension Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Period of service credit by employee	1 year

Benefit Plans - Components of N

Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 102
Interest cost	$ 21	83
Expected return on plan assets	(9)	(74)
Recognized net actuarial loss		21
Net periodic benefit cost	$ 12	$ 132

Earnings per Common Share - Com

Earnings per Common Share - Computation of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
(Numerator):
Net income	$ 1,543	$ 1,099
(Denominator):
Weighted average shares outstanding - basic	4,935,421	4,920,315
Potentially dilutive common shares - restricted stock units	2,204	2,802
Weighted average shares outstanding - diluted	4,937,625	4,923,117
Income per common share
Basic	$ 0.31	$ 0.22
Diluted	$ 0.31	$ 0.22

Fair Value Measurements - Balan

Fair Value Measurements - Balances of Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	$ 91,907	$ 94,802	[1]
U.S. Agency and Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	77,227	80,171
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	14,669	14,620
Corporate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	11	11
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	91,907	94,802
Fair Value, Measurements, Recurring [Member] | U.S. Agency and Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	77,227	80,171
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	14,669	14,620
Fair Value, Measurements, Recurring [Member] | Corporate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	11	11
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	11	11
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	11	11
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	91,896	94,791
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency and Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	77,227	80,171
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale Securities, Fair Value	$ 14,669	$ 14,620
[1]	Derived from audited consolidated financial statements.

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Period of maturity as classifies as short-term borrowings	90 days
Fair value of loan commitments and standby letters of credit	$ 0	$ 0
Loans Held For Sale [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Non recurring fair value adjustments on loans held for sale	$ 0	$ 0
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Period under consideration for valuation of real estate collateral	12 months
Period under consideration for valuation of business equipment	1 year
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Period under consideration for valuation of house or building in the process of construction	1 year

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets Measured at Fair Value on a Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 250	$ 250	[1]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, net	54	116
Other real estate owned	250	250
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, net	54	116
Other real estate owned	$ 250	$ 250
[1]	Derived from audited consolidated financial statements.

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Fair Value, Measurements, Nonrecurring [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Impaired Loans Asset, Net [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value assets	$ 54	$ 116
Fair Value Measurements, Valuation Techniques	Property appraisals
Selling cost	10.00%	10.00%
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value assets	$ 250	$ 250
Fair Value Measurements, Valuation Techniques	Property appraisals
Selling cost	0.00%	0.00%

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial Assets
Securities available for sale	$ 91,907	$ 94,802	[1]
Securities held to maturity	51,999	53,398	[1]
Restricted securities	1,570	1,548	[1]
Bank owned life insurance	14,013	13,928	[1]
Accrued interest receivable	1,753	1,746	[1]
Carrying Amount [Member]
Financial Assets
Cash and short-term investments	45,839	41,092
Securities available for sale	91,907	94,802
Securities held to maturity	51,999	53,398
Restricted securities	1,570	1,548
Loans held for sale		337
Loans, net	492,319	480,746
Bank owned life insurance	14,013	13,928
Accrued interest receivable	1,753	1,746
Financial Liabilities
Deposits	654,769	645,570
Subordinated debt	4,934	4,930
Junior subordinated debt	9,279	9,279
Accrued interest payable	88	95
Fair Value [Member]
Financial Assets
Cash and short-term investments	45,839	41,092
Securities available for sale	91,907	94,802
Securities held to maturity	51,608	52,709
Restricted securities	1,570	1,548
Loans held for sale		337
Loans, net	492,578	481,475
Bank owned life insurance	14,013	13,928
Accrued interest receivable	1,753	1,746
Financial Liabilities
Deposits	653,529	644,322
Subordinated debt	4,709	4,715
Junior subordinated debt	9,175	9,075
Accrued interest payable	88	95
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets
Cash and short-term investments	45,839	41,092
Securities available for sale	11	11
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets
Securities available for sale	91,896	94,791
Securities held to maturity	50,124	51,223
Restricted securities	1,570	1,548
Loans held for sale		337
Bank owned life insurance	14,013	13,928
Accrued interest receivable	1,753	1,746
Financial Liabilities
Deposits	527,921	517,143
Accrued interest payable	88	95
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets
Securities held to maturity	1,484	1,486
Loans, net	492,578	481,475
Financial Liabilities
Deposits	125,608	127,179
Subordinated debt	4,709	4,715
Junior subordinated debt	$ 9,175	$ 9,075
[1]	Derived from audited consolidated financial statements.

Stock Compensation Plans - Addi

Stock Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	May 13, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted	2,000
Stock-based compensation expense related to stock awards	$ 30,000	$ 0
Stock-based compensation	$ 64,000	40,000
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant				240,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted	3,939
Restricted stock units, vested	8,536
Restricted stock units, nonvested	5,662		10,259
Vesting period	2 years
Total unrecognized pre-tax compensation expense related to unvested restricted stock unit awards	$ 60,000
Stock-based compensation	$ 34,000	$ 40,000
Restricted Stock Units [Member] | Vesting Immediately [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, vested	1,317
Restricted Stock Units [Member] | Vesting Within Two Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, nonvested	2,622
Percentage of units vesting	50.00%
Restricted Stock Units [Member] | Vesting Within One Year [ [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vesting	50.00%

Stock Compensation Plans - Summ

Stock Compensation Plans - Summary of Restricted Stock Units (Detail)	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted	2,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Unvested, beginning of period	10,259
Shares, Granted	3,939
Shares, Vested	(8,536)
Shares, Forfeited	0
Shares, unvested, end of period	5,662
Weighted Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares	$ 8.88
Weighted Average Grant Date Fair Value, Granted | $ / shares	15.20
Weighted Average Grant Date Fair Value, Vested | $ / shares	9.89
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	0
Weighted Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares	$ 11.76

Accumulated Other Comprehensi66

Accumulated Other Comprehensive Loss - Schedule of Changes in Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 52,151	[1]	$ 45,953
Unrealized holding gains, net of tax	381		749
Reclassification adjustment, net of tax			(4)
Change during period	381		745
Ending Balance	53,978		47,700
Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(860)		(192)
Unrealized holding gains, net of tax	381		749
Reclassification adjustment, net of tax			(4)
Change during period	381		745
Ending Balance	(479)		553
Adjustments Related to Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(1,396)
Ending Balance			(1,396)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(860)		(1,588)
Change during period	381		745
Ending Balance	$ (479)		$ (843)
[1]	Derived from audited consolidated financial statements.

Accumulated Other Comprehensi67

Accumulated Other Comprehensive Loss - Schedule of Changes in Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Unrealized holding gains, tax	$ 196	$ 387
Reclassification adjustment, tax	$ 0	$ (2)

Accumulated Other Comprehensi68

Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings		$ (6)
Related income tax expense	$ 639	426
Total reclassifications	$ (1,543)	(1,099)
Amount Reclassified from Accumulated Other Comprehensive Loss [Member] | Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings		(6)
Related income tax expense		2
Total reclassifications		$ (4)