Citizens Holding (CIZN) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 10, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	CIZN
Entity Registrant Name	CITIZENS HOLDING CO /MS/
Entity Central Index Key	1,075,706
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		4,894,705

Consolidated Financial Statemen

Consolidated Financial Statements - USD ($)	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 13,190,006	$ 17,962,990
Interest bearing deposits with other banks	20,125,134	1,532,420
Investment securities available for sale, at fair value	469,894,602	505,046,377
Loans, net of allowance for loan losses of $2,725,441 in 2018 and $3,019,228 in 2017	405,457,118	402,390,574
Premises and equipment, net	20,373,791	20,571,551
Other real estate owned, net	3,434,734	3,980,127
Accrued interest receivable	4,128,882	4,450,723
Cash surrender value of life insurance	24,799,688	24,612,779
Deferred tax assets, net	7,075,740	5,362,750
Other assets	7,561,187	7,185,537
TOTAL ASSETS	976,040,882	993,095,828
Deposits:
Noninterest-bearing demand	170,079,423	159,291,356
Interest-bearing NOW and money market accounts	329,016,907	306,047,053
Savings deposits	80,409,620	77,784,876
Certificates of deposit	206,121,133	177,562,214
Total deposits	785,627,083	720,685,499
Securities sold under agreement to repurchase	98,843,862	142,497,938
Federal Funds Purchased		1,500,000
Federal Home Loan Bank advances		30,000,000
Accrued interest payable	201,615	198,183
Deferred compensation payable	8,729,801	8,620,890
Other liabilities	605,625	1,142,278
Total liabilities	894,007,986	904,644,788
SHAREHOLDERS' EQUITY
Common stock; $0.20 par value, 22,500,000 shares authorized, 4,894,705 shares issued and outstanding at March 31, 2018 and 4,894,705 shares issued and outstanding at December 31, 2017	978,941	978,941
Additional paid-in capital	4,148,195	4,103,139
Retained earnings	92,192,037	91,594,379
Accumulated other comprehensive loss, net of tax benefit of $5,081,847 in 2018 and $2,734,500 in 2017	(15,286,277)	(8,225,419)
Total shareholders' equity	82,032,896	88,451,040
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 976,040,882	$ 993,095,828

Consolidated Financial Stateme3

Consolidated Financial Statements (Parenthetical) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Loans, allowance for loan losses	$ 2,725,441	$ 3,019,228
Common stock, par value	$ 0.20	$ 0.20
Common stock, shares authorized	22,500,000	22,500,000
Common stock, shares issued	4,894,705	4,894,705
Common stock, shares outstanding	4,894,705	4,894,705
Accumulated other comprehensive loss, tax benefits	$ 5,081,847	$ 2,734,500

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Loans, including fees	$ 4,716,419	$ 4,568,079
Investment securities	2,822,688	2,832,451
Other interest	60,284	68,547
Total interest income	7,599,391	7,469,077
INTEREST EXPENSE
Deposits	501,209	477,642
Other borrowed funds	293,431	329,805
Total interest expense	794,640	807,447
NET INTEREST INCOME	6,804,751	6,661,630
REVERSAL OF LOAN LOSSES	(236,773)	(151,220)
NET INTEREST INCOME AFTER REVERSAL OF LOAN LOSSES	7,041,524	6,812,850
OTHER INCOME
Service charges on deposit accounts	1,143,593	1,042,031
Other service charges and fees	668,464	616,772
Other operating income	288,373	275,457
Total other income	2,100,430	1,934,260
OTHER EXPENSES
Salaries and employee benefits	3,667,857	3,663,804
Occupancy expense	1,525,379	1,310,243
Other operating expense	1,854,446	2,135,109
Total other expenses	7,047,682	7,109,156
INCOME BEFORE PROVISION FOR INCOME TAXES	2,094,272	1,637,954
PROVISION FOR INCOME TAXES	321,885	200,629
NET INCOME	$ 1,772,387	$ 1,437,325
NET INCOME PER SHARE -Basic	$ 0.36	$ 0.29
NET INCOME PER SHARE -Diluted	0.36	0.29
DIVIDENDS PAID PER SHARE	$ 0.24	$ 0.24

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,772,387	$ 1,437,325
Securities available-for-sale
Unrealized holding (losses) gains	(9,416,226)	4,404,089
Income tax effect	2,349,348	(1,642,725)
Net unrealized gains	(7,066,878)	2,761,364
Reclassification adjustment for gains included in net income	8,021
Income tax effect	(2,001)
Net gains included in net income	6,020
Total other comprehensive income (loss)	(7,060,858)	2,761,364
Comprehensive (loss) income	$ (5,288,471)	$ 4,198,689

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash provided by operating activities	$ 2,567,892	$ 2,350,831
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from maturities and calls of securities available for sale	10,181,801	11,142,246
Proceeds from sale of investment securities	14,752,618
Purchases of investment securities available for sale		(1,322,106)
Purchases of bank premises and equipment	(32,732)	(1,023,788)
Increase in interest bearing deposits with other banks	(18,592,714)	(25,111,537)
Proceeds from sale of other real estate	667,253	82,550
Net (increase) decrease in loans	(2,929,881)	1,104,924
Net cash provided by (used by) investing activities	4,046,345	(15,127,711)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	64,941,584	29,060,135
Net change in securities sold under agreement to repurchase	(43,654,076)	(9,184,626)
Decrease in Federal Funds Purchased	(1,500,000)
Payment of Federal Home Loan Bank advances	(30,000,000)
Proceeds from exercise of stock options		92,625
Payment of dividends	(1,174,729)	(1,172,899)
Net cash (used by) provided by financing activities	(11,387,221)	18,795,235
Net (decrease) increase in cash and due from banks	(4,772,984)	6,018,355
Cash and due from banks, beginning of period	17,962,990	21,688,557
Cash and due from banks, end of period	$ 13,190,006	$ 27,706,912

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1. Summary of Significant Accounting Policies Basis of Presentation These interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). However, these interim consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The interim consolidated financial statements are unaudited and reflect all adjustments and reclassifications, which, in the opinion of management, are necessary for a fair presentation of the results of operations and financial condition as of and for the interim periods presented. All adjustments and reclassifications are of a normal and recurring nature. Results for the period ended March 31, 2018 are not necessarily indicative of the results that may be expected for any other interim period or for the year as a whole. The interim consolidated financial statements of Citizens Holding Company (the “Company”) include the accounts of its wholly-owned subsidiary, The Citizens Bank of Philadelphia (the “Bank” and collectively with Citizens Holding Company, the “Corporation”). All significant intercompany transactions have been eliminated in consolidation. For further information and significant accounting policies of the Corporation, see the Notes to Consolidated Financial Statements of Citizens Holding Company included in the Corporation’s Annual Report on Form 10-K Nature of Business The Bank operates under a state bank charter and provides general banking services. As a state bank, the Bank is subject to regulations of the Mississippi Department of Banking and Consumer Finance and the Federal Deposit Insurance Company. The Company is also subject to the regulations of the Federal Reserve. The area served by the Bank is east central and southern counties of Mississippi and the surrounding areas. Services are provided at several branch offices. Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses and the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans. In connection with the determination of the allowance for loan losses and valuation of foreclosed real estate, management obtains independent appraisals for significant properties. While management uses available information to recognize losses on loans and to value foreclosed real estate, future additions to the allowance or adjustments to the valuation may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan losses and valuations of foreclosed real estate. Such agencies may require the Company to recognize additions to the allowance or to make adjustments to the valuation based on their judgments about information available to them at the time of their examination. Due to these factors, it is reasonably possible that the allowance for loan losses and valuation of foreclosed real estate may change materially in the near term. Revenue from Contracts with Customers The Company records revenue from contracts with customers in accordance with Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (“Topic 606”). Under Topic 606, the Company must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) the Company satisfies a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous or future periods. The Company’s primary sources of revenue are derived from interest and dividends earned on loans, investment securities, and other financial instruments that are not within the scope of Topic 606. The Company has evaluated the nature of its contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Income was not necessary. The Company generally fully satisfies its performance obligations on its contracts with customers as services are rendered and the transaction prices are typically fixed; charged either on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers. Adoption of New Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, 2014-09”), 2014-09 2014-09. 2014-09, 2014-09 In January 2016, the FASB issued ASU No. 2016-01, 2016-01”). 2016-01 2016-01. 2016-01 In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments 2016-15”). 2016-15 zero-coupon In January 2017, FASB issued ASU 2017-01, “Business Combinations (Topic 805), Clarifying the Definition of a Business” 2017-01”), 2017-01 2017-01 In February 2018, FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220)” 2018-02”). 2018-02 2018-02 2018-02 Newly Issued, But Not Yet Effective Accounting Standards On September 16, 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments 2016-13”). held-to-maturity In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02”). ASU 2016-02 on-balance right-of-use 2016-02 2016-02 In March 2017, the FASB issued ASU No. 2017-08, Receivables- Nonrefundable Fees and Other Costs (Subtopic 310-20) 2017-08”). ASU 2017-08 2017-08 2017-08 In May 2017, the FASB issued ASU 2017-09, “Compensation - Stock Compensation (Subtopic 718): Scope of Modification Accounting” 2017-09”). 2017-09 2017-09 2017-09

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 2. Commitments and Contingent Liabilities In the ordinary course of business, the Corporation enters into commitments to extend credit to its customers. The unused portion of these commitments is not reflected in the accompanying financial statements. As of March 31, 2018, the Corporation had entered into loan commitments with certain customers with an aggregate unused balance of $43,850,794 compared to an aggregate unused balance of $46,405,869 at December 31, 2017. There were $2,884,010 of letters of credit outstanding at March 31, 2018 and $2,842,010 at December 31, 2017. The fair value of such commitments is not considered material because letters of credit and loan commitments often are not used in their entirety, if at all, before they expire. The balances of such letters and commitments should not be used to project actual future liquidity requirements. However, the Corporation does incorporate expectations about the utilization under its credit-related commitments and into its asset and liability management program. The Corporation is a party to lawsuits and other claims that arise in the ordinary course of business, all of which are being vigorously contested. In the regular course of business, management evaluates estimated losses or costs related to litigation, and provisions are made for anticipated losses whenever management believes that such losses are probable and can be reasonably estimated. At the present time, management believes, based on the advice of legal counsel, that the final resolution of pending legal proceedings will not likely have a material impact on the Corporation’s consolidated financial condition or results of operations.

Net Income per Share

Net Income per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income per Share	Note 3. Net Income per Share Net income per share - basic has been computed based on the weighted average number of shares outstanding during each period. Net income per share - diluted has been computed based on the weighted average number of shares outstanding during each period plus the dilutive effect of outstanding stock options and restricted stock using the treasury stock method. Net income per share was computed as follows: For the Three Months Ended March 31 2018 2017 Basic weighted average shares outstanding 4,882,705 4,883,679 Dilutive effect of granted options 5,802 14,214 Diluted weighted average shares outstanding 4,888,507 4,897,893 Net income $ 1,772,387 $ 1,437,325 Net income per share-basic $ 0.36 $ 0.29 Net income per share-diluted $ 0.36 $ 0.29

Equity Compensation Plans

Equity Compensation Plans	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Compensation Plans	Note 4. Equity Compensation Plans The Corporation has adopted the 2013 Incentive Compensation Plan (the “2013 Plan”), which the Corporation intends to use for all future equity grants to employees, directors or consultants until the termination or expiration of the 2013 Plan. Prior to the adoption of the 2013 Plan, the Corporation utilized two stock-based compensation plans, the 1999 Directors’ Stock Compensation Plan (the “Directors’ Plan”) for directors, and the 1999 Employees’ Long-Term Incentive Plan (the “Employees’ Plan”) for employees, both of which have expired. The following table is a summary of the stock option activity for the three months ended March 31, 2018. Directors’ Plan 2013 Plan Weighted Weighted Number Average Number Average of Exercise of Exercise Shares Price Shares Price Outstanding at December 31, 2017 63,000 $ 20.96 — $ — Granted — — — — Exercised — — — — Expired — — — — Outstanding at March 31, 2018 63,000 $ 20.96 — $ — The intrinsic value of options outstanding under the Directors’ Plan at March 31, 2018, was $107,910. No options were outstanding under the 2013 Plan or the Employee’s Plan as of March 31, 2018. During the quarter ended June 30, 2017, the Corporation’s directors received restricted stock grants totaling 7,500 shares of common stock under the 2013 Plan. These grants vest over a one-year one-year

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 5. Income Taxes The Tax Cuts and Jobs Act (the “Tax Act”), enacted on December 22, 2017, among other things, permanently lowered the statutory federal corporate tax rate from 34% to 21%, effective for tax years including or beginning January 1, 2018. Under the guidance of ASC 740, “Income Taxes” (“ASC 740”), the Company revalued its net deferred tax assets on the date of enactment based on the reduction in the overall future tax benefit expected to be realized at the lower tax rate implemented by the new legislation, the Company’s revaluation of its net deferred tax assets was $2,558,859, which was included in “Provision for Income Taxes” in the Consolidated Statements of Income at December 31, 2017. Although in the normal course of business the Company is required to make estimates and assumptions for certain tax items which cannot be fully determined at period end, the Company did not identify items for which the income tax effects of the Tax Act had not been completed as of December 31, 2017 and, therefore, considered its accounting for the tax effects of the Tax Act on its net deferred tax asset to have been completed as of December 31, 2017. The effective tax rate for the three months ended March 31, 2018 and 2017 differ from the statutory federal income tax rates of 21% and 34%, respectively, due primarily to state income taxes offset by tax exempt interest income.

Securities

Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	Note 6. Securities The amortized cost and estimated fair value of securities available-for-sale Gross Gross March 31, 2018 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 177,818,695 $ — $ 6,826,209 $ 170,992,486 Mortgage backed securities 199,874,987 25,388 8,745,057 191,155,318 State, County, Municipals 109,703,750 99,882 5,139,691 104,663,941 Other investments 2,865,294 217,563 — 3,082,857 Total $ 490,262,726 $ 342,833 $ 20,710,957 $ 469,894,602 Gross Gross December 31, 2017 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 180,647,580 $ — $ 4,199,022 $ 176,448,558 Mortgage backed securities 213,707,125 43,197 5,327,265 208,423,057 State, County, Municipals 118,786,297 849,364 2,535,126 117,100,535 Other investments 2,865,294 208,933 — 3,074,227 Total $ 516,006,296 $ 1,101,494 $ 12,061,413 $ 505,046,377 The amortized cost and estimated fair value of securities by contractual maturity at March 31, 2018 and December 31, 2017 are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay certain obligations. March 31, 2018 December 31, 2017 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Available-for-sale Due in one year or less $ 3,074,035 $ 3,081,588 $ 3,398,727 $ 3,421,576 Due after one year through five years 97,798,708 94,415,999 75,887,288 74,589,829 Due after five years through ten years 31,372,044 30,271,799 55,691,854 54,740,055 Due after ten years 358,017,939 342,125,216 381,028,427 372,294,917 Total $ 490,262,726 $ 469,894,602 $ 516,006,296 $ 505,046,377 The tables below show the Corporation’s gross unrealized losses and fair value of available-for-sale A summary of unrealized loss information for securities available-for-sale, March 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 15,177,232 $ 494,132 $ 155,715,253 $ 6,332,077 $ 170,892,485 $ 6,826,209 Mortgage backed securities 85,334,413 2,998,856 103,673,842 5,746,201 189,008,255 8,745,057 State, County, Municipal 25,761,217 872,610 64,908,255 4,267,081 90,669,472 5,139,691 Total $ 126,272,862 $ 4,365,598 $ 324,297,350 $ 16,345,359 $ 450,570,212 $ 20,710,957 December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 15,681,866 $ 223,534 $ 160,766,691 $ 3,975,488 $ 176,448,557 $ 4,199,022 Mortgage backed securities 88,499,852 1,613,091 116,753,236 3,714,175 205,253,088 5,327,266 State, County, Municipal 7,117,600 59,041 66,973,174 2,476,084 74,090,774 2,535,125 Total $ 111,299,318 $ 1,895,666 $ 344,493,101 $ 10,165,747 $ 455,792,419 $ 12,061,413 The Corporation’s unrealized losses on its obligations of United States government agencies, mortgage backed securities and state, county and municipal bonds are the result of an upward trend in interest rates, mainly in the mid-term

Loans

Loans	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans	Note 7. Loans The composition of net loans (in thousands) at March 31, 2018 and December 31, 2017 was as follows: March 31, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 29,219 $ 25,923 Farmland 16,364 16,905 1-4 90,823 95,925 Commercial Real Estate 199,810 191,736 Total Real Estate Loans 336,216 330,489 Business Loans: Commercial and Industrial Loans 56,838 58,204 Farm Production and Other Farm Loans 951 922 Total Business Loans 57,789 59,126 Consumer Loans: Credit Cards 1,230 1,310 Other Consumer Loans 13,095 14,680 Total Consumer Loans 14,325 15,990 Total Gross Loans 408,330 405,605 Unearned Income (148 ) (195 ) Allowance for Loan Losses (2,725 ) (3,019 ) Loans, net $ 405,457 $ 402,391 Loans are considered to be past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are placed on non-accrual non-accrual Period-end, non-accrual March 31, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 416 $ — Farmland 353 366 1-4 1,950 2,131 Commercial Real Estate 4,763 4,891 Total Real Estate Loans 7,482 7,388 Business Loans: Farm Production and Other Farm Loans 50 32 Commercial and Industrial Loans 90 78 Total Business Loans 140 110 Consumer Loans: Other Consumer Loans 75 84 Total Consumer Loans 75 84 Total Nonaccrual Loans $ 7,697 $ 7,582 An aging analysis of past due loans (in thousands), segregated by class, as of March 31, 2018, was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 437 $ — $ 437 $ 28,782 $ 29,219 $ — Farmland 286 25 311 16,053 16,364 — 1-4 2,611 266 2,877 87,946 90,823 — Commercial Real Estate 10,345 8 10,353 189,457 199,810 — Total Real Estate Loans 13,679 299 13,978 322,238 336,216 — Business Loans: Commercial and Industrial Loans 660 17 677 56,161 56,838 — Farm Production and Other Farm Loans 73 19 92 859 951 — Total Business Loans 733 36 769 57,020 57,789 — Consumer Loans: Credit Cards 16 10 26 1,204 1,230 — Other Consumer Loans 388 78 466 12,629 13,095 8 Total Consumer Loans 404 88 492 13,833 14,325 8 Total Loans $ 14,816 $ 423 $ 15,239 $ 393,091 $ 408,330 $ 8 An aging analysis of past due loans (in thousands), segregated by class, as of December 31, 2017 was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 281 $ — $ 281 $ 25,642 $ 25,923 $ — Farmland 93 — 93 16,812 16,905 — 1-4 2,657 — 2,657 93,268 95,925 — Commercial Real Estate 2,585 862 3,447 188,289 191,736 807 Total Real Estate Loans 5,616 862 6,478 324,011 330,489 807 Business Loans: Commercial and Industrial Loans 32 — 32 58,172 58,204 — Farm Production and Other Farm Loans 19 — 19 903 922 — Total Business Loans 51 — 51 59,075 59,126 — Consumer Loans: Credit Cards 25 6 31 1,279 1,310 6 Other Consumer Loans 422 — 422 14,258 14,680 — Total Consumer Loans 447 6 453 15,537 15,990 6 Total Loans $ 6,114 $ 868 $ 6,982 $ 398,623 $ 405,605 $ 813 Loans are considered impaired when, based on current information and events, it is probable the Corporation will be unable to collect all amounts due in accordance with the original contractual terms of the loan agreement, including scheduled principal and interest payments. In determining which loans to evaluate for impairment, management looks at all loans over $100,000 that are past due loans, bankruptcy filings and any situation that might lend itself to cause a borrower to be unable to repay the loan according to the original agreement terms. If a loan is determined to be impaired and the collateral is deemed to be insufficient to fully repay the loan, a specific reserve will be established. Interest payments on impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis. Impaired loans or portions thereof, are charged-off Impaired loans (in thousands) as of March 31, 2018, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Investment Real Estate: Land Development and Construction $ 222 $ — $ 222 $ 222 $ 40 $ 222 Farmland 248 248 — 248 — 250 1-4 1,329 1,128 201 1,329 37 1,337 Commercial Real Estate 5,715 1,712 4,003 5,715 383 5,758 Total Real Estate Loans 7,514 3,088 4,426 7,514 460 7,567 Business Loans: Farm Production and Other Farm Loans 50 50 — 50 — 50 Total Business Loans 50 50 — 50 — 50 Total Loans $ 7,564 $ 3,138 $ 4,426 $ 7,564 $ 460 $ 7,617 Impaired loans (in thousands) as of December 31, 2017, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Investment Real Estate: Land Development and Construction $ 222 $ — $ 222 $ 222 $ 0 $ 111 Farmland 252 252 — 252 — 126 1-4 1,344 1,141 203 1,344 46 906 Commercial Real Estate 5,801 1,763 4,038 5,801 397 4,994 Total Real Estate Loans 7,619 3,156 4,463 7,619 443 6,137 Business Loans: Farm Production and Other Farm Loans 50 50 — 50 — 25 Total Business Loans 50 50 — 50 — 25 Total Loans $ 7,669 $ 3,206 $ 4,463 $ 7,669 $ 443 $ 6,162 The following table presents troubled debt restructurings (in thousands, except for number of loans), segregated by class: March 31, 2018 Number of Pre-Modification Post-Modification Commercial real estate 3 $ 4,871 $ 2,984 Total 3 $ 4,871 $ 2,984 Pre-Modification Post-Modification December 31, 2017 Outstanding Outstanding Number of Recorded Recorded Loans Investment Investment Commercial real estate 3 $ 4,871 $ 3,047 Total 3 $ 4,871 $ 3,047 Changes in the Corporation’s troubled debt restructurings (in thousands, except for number of loans) are set forth in the table below: Number Recorded of Loans Investment Totals at January 1, 2017 3 $ 3,047 Reductions due to: Principal paydowns (63 ) Total at March 31, 2018 3 $ 2,984 The allocated allowance for loan losses attributable to restructured loans was $174,274 at March 31, 2018 and December 31, 2017. The Corporation had no remaining availability under commitments to lend additional funds on these troubled debt restructurings as of March 31, 2018. The Corporation utilizes a risk grading matrix to assign a risk grade to each of its loans when originated and is updated as factors related to the strength of the loan changes. Loans are graded on a scale of 1 to 9. A description of the general characteristics of the 9 risk grades follows. Grade 1. MINIMAL RISK - These loans are without loss exposure to the Corporation. This classification is reserved for only the best, well secured loans to borrowers with significant capital strength, low leverage, stable earnings and growth and other readily available financing alternatives. This type of loan would also include loans secured by a program of the government. Grade 2. MODEST RISK - These loans include borrowers with solid credit quality and moderate risk of loss. These loans may be fully secured by certificates of deposit with another reputable financial institution, or secured by readily marketable securities with acceptable margins. Grade 3. AVERAGE RISK - This is the rating assigned to the majority of the loans held by the Corporation. This includes loans with average loss exposure and average overall quality. These loans should liquidate through possessing adequate collateral and adequate earnings of the borrower. In addition, these loans are properly documented and are in accordance with all aspects of the current loan policy. Grade 4. ACCEPTABLE RISK - Borrower generates sufficient cash flow to fund debt service but most working asset and capital expansion needs are provided from external sources. Profitability and key balance sheet ratios are usually close to peers but one or more may be higher than peers. Grade 5. MANAGEMENT ATTENTION - Borrower has significant weaknesses resulting from performance trends or management concerns. The financial condition of the borrower has taken a negative turn and may be temporarily strained. Cash flow is weak but cash reserves remain adequate to meet debt service. Management weakness is evident. Grade 6. OTHER LOANS ESPECIALLY MENTIONED (“OLEM”) - Loans in this category are fundamentally sound but possess some weaknesses. OLEM loans have potential weaknesses which may, if not checked or corrected, weaken the asset or inadequately protect the bank’s credit position at some future date. These loans have an identifiable weakness in credit, collateral, or repayment ability but there is no expectation of loss. Grade 7. SUBSTANDARD ASSETS - Assets classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Assets classified as substandard must have a well-defined weakness based upon objective evidence. Assets classified as substandard are characterized by the distinct possibility that the insured institution will sustain some loss if the deficiencies are not corrected. The possibility that liquidation would not be timely requires a substandard classification even if there is little likelihood of total loss. This classification does not mean that the loan will incur a total or partial loss. Substandard loans may or may not be impaired. Grade 8. DOUBTFUL - A loan classified as doubtful has all the weaknesses of a substandard classification and the added characteristic that the weakness makes collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable or improbable. The possibility of loss is extremely high, but because of certain important and reasonable specific pending factors which may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. A doubtful classification could reflect the fact that the primary source of repayment is gone and serious doubt exists as to the quality of a secondary source of repayment. Grade 9. LOSS - Loans classified as loss are considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification does not mean that the asset has absolutely no recovery or salvage value, but rather it is not practical or desirable to defer writing off this basically worthless asset even though partial recovery may occur in the future. Also included in this classification is the defined loss portion of loans rated substandard assets and doubtful assets. These internally assigned grades are updated on a continual basis throughout the course of the year and represent management’s most updated judgment regarding grades at March 31, 2018. The following table details the amount of gross loans (in thousands), segregated by loan grade and class, as of March 31, 2018: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 26,669 $ 1,550 $ 1,000 $ — $ — $ 29,219 Farmland 14,997 372 995 — — 16,364 1-4 80,294 2,517 8,012 — — 90,823 Commercial Real Estate 148,350 34,385 17,075 — — 199,810 Total Real Estate Loans 270,310 38,824 27,082 — — 336,216 Business Loans: Commercial and Industrial Loans 53,700 986 2,152 — — 56,838 Farm Production and Other Farm Loans 886 7 58 — — 951 Total Business Loans 54,586 993 2,210 — — 57,789 Consumer Loans: Credit Cards 1,220 — 10 — — 1,230 Other Consumer Loans 12,803 110 124 58 — 13,095 Total Consumer Loans 14,023 110 134 58 — 14,325 Total Loans $ 338,919 $ 39,927 $ 29,426 $ 58 $ — $ 408,330 The following table details the amount of gross loans (in thousands) segregated by loan grade and class, as of December 31, 2017: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 23,720 $ 2,116 $ 87 $ — $ — $ 25,923 Farmland 15,496 377 1,032 — — 16,905 1-4 82,227 5,615 8,083 — — 95,925 Commercial Real Estate 143,271 41,833 6,632 — — 191,736 Total Real Estate Loans 264,714 49,941 15,834 — — 330,489 Business Loans: Commercial and Industrial Loans 55,081 2,990 133 — — 58,204 Farm Production and Other Farm Loans 853 9 60 — — 922 Total Business Loans 55,934 2,999 193 — — 59,126 Consumer Loans: Credit Cards 1,304 — 6 — — 1,310 Other Consumer Loans 14,414 71 137 58 — 14,680 Total Consumer Loans 15,718 71 143 58 — 15,990 Total Loans $ 336,366 $ 53,011 $ 16,170 $ 58 $ — $ 405,605 The allowance for loan losses is established through a provision for loan losses charged to expense, which represents management’s best estimate of probable losses within the existing portfolio of loans. The allowance, in the judgment of management, is necessary to reserve for estimated loan losses and risks inherent in the loan portfolio. The allowance on the majority of the loan portfolio is calculated using a historical chargeoff percentage applied to the current loan balances by loan segment. This historical period is the average of the previous twenty quarters with the most current quarters weighted more heavily to show the effect of the most recent chargeoff activity. This percentage is also adjusted for economic factors such as local unemployment and general business conditions, both local and nationwide. The group of loans that are considered to be impaired are individually evaluated for possible loss and a specific reserve is established to cover any loss contingency. Loans that are determined to be a loss with no benefit of remaining in the portfolio are charged off to the allowance. These specific reserves are reviewed periodically for continued impairment and adequacy of the specific reserve and are adjusted when necessary. The following table details activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2018: Real Business Estate Loans Consumer Total March 31, 2018 Beginning Balance, January 1, 2018 $ 2,151,715 $ 346,781 $ 520,732 $ 3,019,228 Reversal of loan losses (65,925 ) (150,889 ) (19,959 ) (236,773 ) Chargeoffs 83,045 15,347 30,845 129,237 Recoveries 45,114 861 26,248 72,223 Net chargeoffs (recoveries) 37,931 14,486 4,597 57,014 Ending Balance $ 2,047,859 $ 181,406 $ 496,176 $ 2,725,441 Period end allowance allocated to: Loans individually evaluated for impairment $ 459,359 $ — $ — $ 459,359 Loans collectively evaluated for impairment 1,588,500 181,406 496,176 2,266,082 Ending Balance, March 31, 2018 $ 2,047,859 $ 181,406 $ 496,176 $ 2,725,441 The following table details activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017: Real Business Estate Loans Consumer Total March 31, 2017 Beginning Balance, January 1, 2017 $ 3,117,134 $ 257,554 $ 528,108 $ 3,902,796 (Reversal of) provision for loan losses (282,820 ) 175,477 (43,877 ) (151,220 ) Chargeoffs 4,107 67,850 12,046 84,003 Recoveries 12,465 254 21,622 34,341 Net chargeoffs (recoveries) (8,358 ) 67,596 (9,576 ) 49,662 Ending Balance $ 2,842,672 $ 365,435 $ 493,807 $ 3,701,914 Period end allowance allocated to: Loans individually evaluated for impairment $ 649,449 $ 61,288 $ — $ 710,737 Loans collectively evaluated for impairment 2,193,223 304,147 493,807 2,991,177 Ending Balance, March 31, 2017 $ 2,842,672 $ 365,435 $ 493,807 $ 3,701,914 The Corporation’s recorded investment in loans as of March 31, 2018 and December 31, 2017 related to each balance in the allowance for possible loan losses by portfolio segment and disaggregated on the basis of the Corporation’s impairment methodology was as follows (in thousands): Real Business Estate Loans Consumer Total March 31, 2018 Loans individually evaluated for specific impairment $ 7,514 $ 50 $ — $ 7,564 Loans collectively evaluated for general impairment 328,702 57,739 14,325 400,766 $ 336,216 $ 57,789 $ 14,325 $ 408,330 Real Business Estate Loans Consumer Total December 31, 2017 Loans individually evaluated for specific impairment $ 4,396 $ — $ — $ 4,396 Loans collectively evaluated for general impairment 326,093 59,126 15,990 401,209 $ 330,489 $ 59,126 $ 15,990 $ 405,605

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 8. Fair Value of Financial Instruments The fair value topic of the ASC establishes a framework for measuring fair value and requires enhanced disclosures about fair value measurements. This topic clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. This topic also requires disclosure about how fair value was determined for assets and liabilities and establishes a hierarchy for which these assets and liabilities must be grouped, based on significant levels of inputs as follows: Level 1 Quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 Inputs other than quoted prices in active markets for identical assets and liabilities included in Level 1 that are observable for the asset or liability, either directly or indirectly, such as quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in markets that are not active; or Level 3 Unobservable inputs for an asset or liability, such as discounted cash flow models or valuations. The determination of where assets and liabilities fall within this hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The following table presents assets and liabilities that were measured at fair value on a recurring basis as of March 31, 2018: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 170,992,486 $ — $ 170,992,486 Mortgage-backed securities — 191,155,318 — 191,155,318 State, county and municipal obligations — 104,663,941 — 104,663,941 Other investments — — 3,082,857 3,082,857 Total $ — $ 466,811,745 $ 3,082,857 $ 469,894,602 The following table presents assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2017: Fair Value Measurements Using: Quoted Prices Significant Significant (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 176,448,558 $ — $ 176,448,558 Mortgage-backed securities — 208,423,057 — 208,423,057 State, county and municipal obligations — 117,100,535 — 117,100,535 Other investments — — 3,074,227 3,074,227 Total $ — $ 501,972,150 $ 3,074,227 $ 505,046,377 The following table reports the activity in assets measured at fair value on a recurring basis using significant unobservable inputs: Fair Value Measurements Using: Significant Unobservable Inputs (Level 3) Structured Financial Product As of March 31, 2018 2017 Beginning Balance $ 3,074,227 $ 2,971,106 Principal payments received — (4,466 ) Unrealized gains included in other comprehensive income 8,630 19,119 Ending Balance $ 3,082,857 $ 2,985,759 The Corporation recorded no gains or losses in earnings for the period ended March 31, 2018 or December 31, 2017 that were attributable to the change in unrealized gains or losses relating to assets still held at the reporting date. The following table presents information as of March 31, 2018 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis: Significant Financial instrument Fair Value Valuation Technique Unobservable Inputs Range of Inputs Trust preferred securities $ 3,082,857 Discounted cash flows Default rate 0-100 % For assets measured at fair value on a nonrecurring basis during 2018 that were still held on the Corporation’s balance sheet at March 31, 2018, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices Significant Significant (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 182,250 $ 182,250 Total $ — $ — $ 182,250 $ 182,250 The following table presents information as of March 31, 2018 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation Technique Significant Unobservable Range of Impaired loans $ 182,250 Appraised value of collateral less estimated costs to sell Estimated costs to sell 25 % For assets measured at fair value on a nonrecurring basis during 2017 that were still held on the Corporation’s balance sheet at December 31, 2017, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices Significant Significant (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 544,502 $ 544,502 Other real estate owned — — 1,307,250 1,307,250 Total $ — $ — $ 1,851,752 $ 1,851,752 Impaired loans with a carrying value of $7,564,145 and $7,668,808 had an allocated allowance for loan losses of $459,359 and $442,589 at March 31, 2018 and December 31, 2017, respectively. The allocated allowance is based on the carrying value of the impaired loan and the fair value of the underlying collateral less estimated costs to sell. Real estate acquired through foreclosure or deed in lieu, sometimes referred to as other real estate owned (“OREO”), during the three-month period ended March 31, 2018, and recorded at fair value, less costs to sell, was $100,109. There were no writedowns during the period on properties owned. OREO acquired during 2017 and recorded at fair value, less costs to sell, was $88,579. There were $413,740 in additional writedowns during 2017 on OREO acquired in previous years. The financial instruments topic of the ASC requires disclosure of financial instruments’ fair values, as well as the methodology and significant assumptions used in estimating fair values. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instrument. The financial instruments topic of the ASC excludes certain financial instruments from its disclosure requirements. The following represents the carrying value and estimated fair value of the Corporation’s financial instruments at March 31, 2018: Fair Value Measurements Using: March 31, 2018 Carrying Value Quoted Prices in Significant Significant Total (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 13,190,006 $ 13,190,006 $ — $ — $ 13,190,006 Interest bearing deposits with banks 20,125,134 20,125,134 — — 20,125,134 Securities available-for-sale 469,894,602 — 466,811,745 3,082,857 469,894,602 Net loans 405,457,118 — — 402,515,468 402,515,468 Financial liabilities Deposits $ 785,627,083 $ 579,505,950 $ — $ 206,254,956 $ 785,760,906 Securities Sold under Agreement to Repurchase 98,843,862 98,843,862 — — 98,843,862 The following represents the carrying value and estimated fair value of the Corporation’s financial instruments at December 31, 2017: Fair Value Measurements Using: December 31, 2017 Carrying Value Quoted Prices in Significant Significant Total (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 17,962,990 $ 17,962,990 $ — $ — $ 17,962,990 Interest bearing deposits with banks 1,532,420 1,532,420 — — 1,532,420 Securities available-for-sale 505,046,377 — 501,972,150 3,074,227 505,046,377 Net loans 402,390,574 — — 401,706,081 401,706,081 Financial liabilities Deposits $ 720,685,499 $ 543,123,284 $ — $ 177,698,280 $ 720,821,564 Federal Home Loan Bank advances 30,000,000 — — 30,005,541 30,005,541 Securities Sold under Agreement to Repurchase 142,497,938 142,497,938 — — 142,497,938

Summary of Significant Accoun15

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). However, these interim consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The interim consolidated financial statements are unaudited and reflect all adjustments and reclassifications, which, in the opinion of management, are necessary for a fair presentation of the results of operations and financial condition as of and for the interim periods presented. All adjustments and reclassifications are of a normal and recurring nature. Results for the period ended March 31, 2018 are not necessarily indicative of the results that may be expected for any other interim period or for the year as a whole. The interim consolidated financial statements of Citizens Holding Company (the “Company”) include the accounts of its wholly-owned subsidiary, The Citizens Bank of Philadelphia (the “Bank” and collectively with Citizens Holding Company, the “Corporation”). All significant intercompany transactions have been eliminated in consolidation. For further information and significant accounting policies of the Corporation, see the Notes to Consolidated Financial Statements of Citizens Holding Company included in the Corporation’s Annual Report on Form 10-K
Nature of Business	Nature of Business The Bank operates under a state bank charter and provides general banking services. As a state bank, the Bank is subject to regulations of the Mississippi Department of Banking and Consumer Finance and the Federal Deposit Insurance Company. The Company is also subject to the regulations of the Federal Reserve. The area served by the Bank is east central and southern counties of Mississippi and the surrounding areas. Services are provided at several branch offices.
Estimates	Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses and the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans. In connection with the determination of the allowance for loan losses and valuation of foreclosed real estate, management obtains independent appraisals for significant properties. While management uses available information to recognize losses on loans and to value foreclosed real estate, future additions to the allowance or adjustments to the valuation may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan losses and valuations of foreclosed real estate. Such agencies may require the Company to recognize additions to the allowance or to make adjustments to the valuation based on their judgments about information available to them at the time of their examination. Due to these factors, it is reasonably possible that the allowance for loan losses and valuation of foreclosed real estate may change materially in the near term.
Revenue from Contracts with Customers	Revenue from Contracts with Customers The Company records revenue from contracts with customers in accordance with Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (“Topic 606”). Under Topic 606, the Company must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) the Company satisfies a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous or future periods. The Company’s primary sources of revenue are derived from interest and dividends earned on loans, investment securities, and other financial instruments that are not within the scope of Topic 606. The Company has evaluated the nature of its contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Income was not necessary. The Company generally fully satisfies its performance obligations on its contracts with customers as services are rendered and the transaction prices are typically fixed; charged either on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.
Adoption of New Accounting Standards	Adoption of New Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, 2014-09”), 2014-09 2014-09. 2014-09, 2014-09 In January 2016, the FASB issued ASU No. 2016-01, 2016-01”). 2016-01 2016-01. 2016-01 In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments 2016-15”). 2016-15 zero-coupon In January 2017, FASB issued ASU 2017-01, “Business Combinations (Topic 805), Clarifying the Definition of a Business” 2017-01”), 2017-01 2017-01 In February 2018, FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220)” 2018-02”). 2018-02 2018-02 2018-02 Newly Issued, But Not Yet Effective Accounting Standards On September 16, 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments 2016-13”). held-to-maturity In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02”). ASU 2016-02 on-balance right-of-use 2016-02 2016-02 In March 2017, the FASB issued ASU No. 2017-08, Receivables- Nonrefundable Fees and Other Costs (Subtopic 310-20) 2017-08”). ASU 2017-08 2017-08 2017-08 In May 2017, the FASB issued ASU 2017-09, “Compensation - Stock Compensation (Subtopic 718): Scope of Modification Accounting” 2017-09”). 2017-09 2017-09 2017-09

Net Income per Share (Tables)

Net Income per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Net income per share was computed as follows: For the Three Months Ended March 31 2018 2017 Basic weighted average shares outstanding 4,882,705 4,883,679 Dilutive effect of granted options 5,802 14,214 Diluted weighted average shares outstanding 4,888,507 4,897,893 Net income $ 1,772,387 $ 1,437,325 Net income per share-basic $ 0.36 $ 0.29 Net income per share-diluted $ 0.36 $ 0.29

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Activity	The following table is a summary of the stock option activity for the three months ended March 31, 2018. Directors’ Plan 2013 Plan Weighted Weighted Number Average Number Average of Exercise of Exercise Shares Price Shares Price Outstanding at December 31, 2017 63,000 $ 20.96 — $ — Granted — — — — Exercised — — — — Expired — — — — Outstanding at March 31, 2018 63,000 $ 20.96 — $ —

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Value of Securities Available-for-Sale	The amortized cost and estimated fair value of securities available-for-sale Gross Gross March 31, 2018 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 177,818,695 $ — $ 6,826,209 $ 170,992,486 Mortgage backed securities 199,874,987 25,388 8,745,057 191,155,318 State, County, Municipals 109,703,750 99,882 5,139,691 104,663,941 Other investments 2,865,294 217,563 — 3,082,857 Total $ 490,262,726 $ 342,833 $ 20,710,957 $ 469,894,602 Gross Gross December 31, 2017 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 180,647,580 $ — $ 4,199,022 $ 176,448,558 Mortgage backed securities 213,707,125 43,197 5,327,265 208,423,057 State, County, Municipals 118,786,297 849,364 2,535,126 117,100,535 Other investments 2,865,294 208,933 — 3,074,227 Total $ 516,006,296 $ 1,101,494 $ 12,061,413 $ 505,046,377
Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity	The amortized cost and estimated fair value of securities by contractual maturity at March 31, 2018 and December 31, 2017 are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay certain obligations. March 31, 2018 December 31, 2017 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Available-for-sale Due in one year or less $ 3,074,035 $ 3,081,588 $ 3,398,727 $ 3,421,576 Due after one year through five years 97,798,708 94,415,999 75,887,288 74,589,829 Due after five years through ten years 31,372,044 30,271,799 55,691,854 54,740,055 Due after ten years 358,017,939 342,125,216 381,028,427 372,294,917 Total $ 490,262,726 $ 469,894,602 $ 516,006,296 $ 505,046,377
Summary of Unrealized Loss Information for Available-for-sale Securities	A summary of unrealized loss information for securities available-for-sale, March 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 15,177,232 $ 494,132 $ 155,715,253 $ 6,332,077 $ 170,892,485 $ 6,826,209 Mortgage backed securities 85,334,413 2,998,856 103,673,842 5,746,201 189,008,255 8,745,057 State, County, Municipal 25,761,217 872,610 64,908,255 4,267,081 90,669,472 5,139,691 Total $ 126,272,862 $ 4,365,598 $ 324,297,350 $ 16,345,359 $ 450,570,212 $ 20,710,957 December 31, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 15,681,866 $ 223,534 $ 160,766,691 $ 3,975,488 $ 176,448,557 $ 4,199,022 Mortgage backed securities 88,499,852 1,613,091 116,753,236 3,714,175 205,253,088 5,327,266 State, County, Municipal 7,117,600 59,041 66,973,174 2,476,084 74,090,774 2,535,125 Total $ 111,299,318 $ 1,895,666 $ 344,493,101 $ 10,165,747 $ 455,792,419 $ 12,061,413

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Composition of Net Loans	The composition of net loans (in thousands) at March 31, 2018 and December 31, 2017 was as follows: March 31, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 29,219 $ 25,923 Farmland 16,364 16,905 1-4 90,823 95,925 Commercial Real Estate 199,810 191,736 Total Real Estate Loans 336,216 330,489 Business Loans: Commercial and Industrial Loans 56,838 58,204 Farm Production and Other Farm Loans 951 922 Total Business Loans 57,789 59,126 Consumer Loans: Credit Cards 1,230 1,310 Other Consumer Loans 13,095 14,680 Total Consumer Loans 14,325 15,990 Total Gross Loans 408,330 405,605 Unearned Income (148 ) (195 ) Allowance for Loan Losses (2,725 ) (3,019 ) Loans, net $ 405,457 $ 402,391
Period-End, Non-Accrual Loans, Segregated by Class	Period-end, non-accrual March 31, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 416 $ — Farmland 353 366 1-4 1,950 2,131 Commercial Real Estate 4,763 4,891 Total Real Estate Loans 7,482 7,388 Business Loans: Farm Production and Other Farm Loans 50 32 Commercial and Industrial Loans 90 78 Total Business Loans 140 110 Consumer Loans: Other Consumer Loans 75 84 Total Consumer Loans 75 84 Total Nonaccrual Loans $ 7,697 $ 7,582
Aging Analysis of Past Due Loans, Segregated by Class	An aging analysis of past due loans (in thousands), segregated by class, as of March 31, 2018, was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 437 $ — $ 437 $ 28,782 $ 29,219 $ — Farmland 286 25 311 16,053 16,364 — 1-4 2,611 266 2,877 87,946 90,823 — Commercial Real Estate 10,345 8 10,353 189,457 199,810 — Total Real Estate Loans 13,679 299 13,978 322,238 336,216 — Business Loans: Commercial and Industrial Loans 660 17 677 56,161 56,838 — Farm Production and Other Farm Loans 73 19 92 859 951 — Total Business Loans 733 36 769 57,020 57,789 — Consumer Loans: Credit Cards 16 10 26 1,204 1,230 — Other Consumer Loans 388 78 466 12,629 13,095 8 Total Consumer Loans 404 88 492 13,833 14,325 8 Total Loans $ 14,816 $ 423 $ 15,239 $ 393,091 $ 408,330 $ 8 An aging analysis of past due loans (in thousands), segregated by class, as of December 31, 2017 was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 281 $ — $ 281 $ 25,642 $ 25,923 $ — Farmland 93 — 93 16,812 16,905 — 1-4 2,657 — 2,657 93,268 95,925 — Commercial Real Estate 2,585 862 3,447 188,289 191,736 807 Total Real Estate Loans 5,616 862 6,478 324,011 330,489 807 Business Loans: Commercial and Industrial Loans 32 — 32 58,172 58,204 — Farm Production and Other Farm Loans 19 — 19 903 922 — Total Business Loans 51 — 51 59,075 59,126 — Consumer Loans: Credit Cards 25 6 31 1,279 1,310 6 Other Consumer Loans 422 — 422 14,258 14,680 — Total Consumer Loans 447 6 453 15,537 15,990 6 Total Loans $ 6,114 $ 868 $ 6,982 $ 398,623 $ 405,605 $ 813
Impaired Loans, Segregated by Class of Loans	Impaired loans (in thousands) as of March 31, 2018, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Investment Real Estate: Land Development and Construction $ 222 $ — $ 222 $ 222 $ 40 $ 222 Farmland 248 248 — 248 — 250 1-4 1,329 1,128 201 1,329 37 1,337 Commercial Real Estate 5,715 1,712 4,003 5,715 383 5,758 Total Real Estate Loans 7,514 3,088 4,426 7,514 460 7,567 Business Loans: Farm Production and Other Farm Loans 50 50 — 50 — 50 Total Business Loans 50 50 — 50 — 50 Total Loans $ 7,564 $ 3,138 $ 4,426 $ 7,564 $ 460 $ 7,617 Impaired loans (in thousands) as of December 31, 2017, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Investment Real Estate: Land Development and Construction $ 222 $ — $ 222 $ 222 $ 0 $ 111 Farmland 252 252 — 252 — 126 1-4 1,344 1,141 203 1,344 46 906 Commercial Real Estate 5,801 1,763 4,038 5,801 397 4,994 Total Real Estate Loans 7,619 3,156 4,463 7,619 443 6,137 Business Loans: Farm Production and Other Farm Loans 50 50 — 50 — 25 Total Business Loans 50 50 — 50 — 25 Total Loans $ 7,669 $ 3,206 $ 4,463 $ 7,669 $ 443 $ 6,162
Troubled Debt Restructurings Segregated by Class	The following table presents troubled debt restructurings (in thousands, except for number of loans), segregated by class: March 31, 2018 Number of Pre-Modification Post-Modification Commercial real estate 3 $ 4,871 $ 2,984 Total 3 $ 4,871 $ 2,984 Pre-Modification Post-Modification December 31, 2017 Outstanding Outstanding Number of Recorded Recorded Loans Investment Investment Commercial real estate 3 $ 4,871 $ 3,047 Total 3 $ 4,871 $ 3,047
Changes in Troubled Debt Restructurings	Changes in the Corporation’s troubled debt restructurings (in thousands, except for number of loans) are set forth in the table below: Number Recorded of Loans Investment Totals at January 1, 2017 3 $ 3,047 Reductions due to: Principal paydowns (63 ) Total at March 31, 2018 3 $ 2,984
Detailed Amount of Gross Loans Segregated by Loan Grade and Class	The following table details the amount of gross loans (in thousands), segregated by loan grade and class, as of March 31, 2018: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 26,669 $ 1,550 $ 1,000 $ — $ — $ 29,219 Farmland 14,997 372 995 — — 16,364 1-4 80,294 2,517 8,012 — — 90,823 Commercial Real Estate 148,350 34,385 17,075 — — 199,810 Total Real Estate Loans 270,310 38,824 27,082 — — 336,216 Business Loans: Commercial and Industrial Loans 53,700 986 2,152 — — 56,838 Farm Production and Other Farm Loans 886 7 58 — — 951 Total Business Loans 54,586 993 2,210 — — 57,789 Consumer Loans: Credit Cards 1,220 — 10 — — 1,230 Other Consumer Loans 12,803 110 124 58 — 13,095 Total Consumer Loans 14,023 110 134 58 — 14,325 Total Loans $ 338,919 $ 39,927 $ 29,426 $ 58 $ — $ 408,330 The following table details the amount of gross loans (in thousands) segregated by loan grade and class, as of December 31, 2017: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 23,720 $ 2,116 $ 87 $ — $ — $ 25,923 Farmland 15,496 377 1,032 — — 16,905 1-4 82,227 5,615 8,083 — — 95,925 Commercial Real Estate 143,271 41,833 6,632 — — 191,736 Total Real Estate Loans 264,714 49,941 15,834 — — 330,489 Business Loans: Commercial and Industrial Loans 55,081 2,990 133 — — 58,204 Farm Production and Other Farm Loans 853 9 60 — — 922 Total Business Loans 55,934 2,999 193 — — 59,126 Consumer Loans: Credit Cards 1,304 — 6 — — 1,310 Other Consumer Loans 14,414 71 137 58 — 14,680 Total Consumer Loans 15,718 71 143 58 — 15,990 Total Loans $ 336,366 $ 53,011 $ 16,170 $ 58 $ — $ 405,605
Detailed Activity in Allowance for Possible Loan Losses by Portfolio Segment	The following table details activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2018: Real Business Estate Loans Consumer Total March 31, 2018 Beginning Balance, January 1, 2018 $ 2,151,715 $ 346,781 $ 520,732 $ 3,019,228 Reversal of loan losses (65,925 ) (150,889 ) (19,959 ) (236,773 ) Chargeoffs 83,045 15,347 30,845 129,237 Recoveries 45,114 861 26,248 72,223 Net chargeoffs (recoveries) 37,931 14,486 4,597 57,014 Ending Balance $ 2,047,859 $ 181,406 $ 496,176 $ 2,725,441 Period end allowance allocated to: Loans individually evaluated for impairment $ 459,359 $ — $ — $ 459,359 Loans collectively evaluated for impairment 1,588,500 181,406 496,176 2,266,082 Ending Balance, March 31, 2018 $ 2,047,859 $ 181,406 $ 496,176 $ 2,725,441 The following table details activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017: Real Business Estate Loans Consumer Total March 31, 2017 Beginning Balance, January 1, 2017 $ 3,117,134 $ 257,554 $ 528,108 $ 3,902,796 (Reversal of) provision for loan losses (282,820 ) 175,477 (43,877 ) (151,220 ) Chargeoffs 4,107 67,850 12,046 84,003 Recoveries 12,465 254 21,622 34,341 Net chargeoffs (recoveries) (8,358 ) 67,596 (9,576 ) 49,662 Ending Balance $ 2,842,672 $ 365,435 $ 493,807 $ 3,701,914 Period end allowance allocated to: Loans individually evaluated for impairment $ 649,449 $ 61,288 $ — $ 710,737 Loans collectively evaluated for impairment 2,193,223 304,147 493,807 2,991,177 Ending Balance, March 31, 2017 $ 2,842,672 $ 365,435 $ 493,807 $ 3,701,914
Recorded Investment in Loans Related to Balance in Allowance for Possible Loan Losses by Portfolio Segment	The Corporation’s recorded investment in loans as of March 31, 2018 and December 31, 2017 related to each balance in the allowance for possible loan losses by portfolio segment and disaggregated on the basis of the Corporation’s impairment methodology was as follows (in thousands): Real Business Estate Loans Consumer Total March 31, 2018 Loans individually evaluated for specific impairment $ 7,514 $ 50 $ — $ 7,564 Loans collectively evaluated for general impairment 328,702 57,739 14,325 400,766 $ 336,216 $ 57,789 $ 14,325 $ 408,330 Real Business Estate Loans Consumer Total December 31, 2017 Loans individually evaluated for specific impairment $ 4,396 $ — $ — $ 4,396 Loans collectively evaluated for general impairment 326,093 59,126 15,990 401,209 $ 330,489 $ 59,126 $ 15,990 $ 405,605

Fair Value of Financial Instr20

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table presents assets and liabilities that were measured at fair value on a recurring basis as of March 31, 2018: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 170,992,486 $ — $ 170,992,486 Mortgage-backed securities — 191,155,318 — 191,155,318 State, county and municipal obligations — 104,663,941 — 104,663,941 Other investments — — 3,082,857 3,082,857 Total $ — $ 466,811,745 $ 3,082,857 $ 469,894,602 The following table presents assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2017: Fair Value Measurements Using: Quoted Prices Significant Significant (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 176,448,558 $ — $ 176,448,558 Mortgage-backed securities — 208,423,057 — 208,423,057 State, county and municipal obligations — 117,100,535 — 117,100,535 Other investments — — 3,074,227 3,074,227 Total $ — $ 501,972,150 $ 3,074,227 $ 505,046,377
Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs	The following table reports the activity in assets measured at fair value on a recurring basis using significant unobservable inputs: Fair Value Measurements Using: Significant Unobservable Inputs (Level 3) Structured Financial Product As of March 31, 2018 2017 Beginning Balance $ 3,074,227 $ 2,971,106 Principal payments received — (4,466 ) Unrealized gains included in other comprehensive income 8,630 19,119 Ending Balance $ 3,082,857 $ 2,985,759
Asset Measured at Fair Value on Nonrecurring Basis	For assets measured at fair value on a nonrecurring basis during 2018 that were still held on the Corporation’s balance sheet at March 31, 2018, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices Significant Significant (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 182,250 $ 182,250 Total $ — $ — $ 182,250 $ 182,250 For assets measured at fair value on a nonrecurring basis during 2017 that were still held on the Corporation’s balance sheet at December 31, 2017, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices Significant Significant (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 544,502 $ 544,502 Other real estate owned — — 1,307,250 1,307,250 Total $ — $ — $ 1,851,752 $ 1,851,752
Carrying Value and Estimated Fair Value of Financial Instruments	The following represents the carrying value and estimated fair value of the Corporation’s financial instruments at March 31, 2018: Fair Value Measurements Using: March 31, 2018 Carrying Value Quoted Prices in Significant Significant Total (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 13,190,006 $ 13,190,006 $ — $ — $ 13,190,006 Interest bearing deposits with banks 20,125,134 20,125,134 — — 20,125,134 Securities available-for-sale 469,894,602 — 466,811,745 3,082,857 469,894,602 Net loans 405,457,118 — — 402,515,468 402,515,468 Financial liabilities Deposits $ 785,627,083 $ 579,505,950 $ — $ 206,254,956 $ 785,760,906 Securities Sold under Agreement to Repurchase 98,843,862 98,843,862 — — 98,843,862 Fair Value Measurements Using: December 31, 2017 Carrying Value Quoted Prices in Significant Significant Total (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 17,962,990 $ 17,962,990 $ — $ — $ 17,962,990 Interest bearing deposits with banks 1,532,420 1,532,420 — — 1,532,420 Securities available-for-sale 505,046,377 — 501,972,150 3,074,227 505,046,377 Net loans 402,390,574 — — 401,706,081 401,706,081 Financial liabilities Deposits $ 720,685,499 $ 543,123,284 $ — $ 177,698,280 $ 720,821,564 Federal Home Loan Bank advances 30,000,000 — — 30,005,541 30,005,541 Securities Sold under Agreement to Repurchase 142,497,938 142,497,938 — — 142,497,938
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) Used in Valuation of Assets and Liabilities Measured at Fair Value	The following table presents information as of March 31, 2018 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis: Significant Financial instrument Fair Value Valuation Technique Unobservable Inputs Range of Inputs Trust preferred securities $ 3,082,857 Discounted cash flows Default rate 0-100 %
Fair Value, Measurements, Nonrecurring [Member]
Significant Unobservable Inputs (Level 3) Used in Valuation of Assets and Liabilities Measured at Fair Value	The following table presents information as of March 31, 2018 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation Technique Significant Unobservable Range of Impaired loans $ 182,250 Appraised value of collateral less estimated costs to sell Estimated costs to sell 25 %

Summary of Significant Accoun21

Summary of Significant Accounting Policies - Additional Information (Detail)	Dec. 31, 2017USD ($)
ASU 2018-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to retained earnings	$ 1,588,198

Commitments and Contingent Li22

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 43,850,794	$ 46,405,869
Letters of credit outstanding	$ 2,884,010	$ 2,842,010

Net Income per Share - Earnings

Net Income per Share - Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	4,882,705	4,883,679
Dilutive effect of granted options	5,802	14,214
Diluted weighted average shares outstanding	4,888,507	4,897,893
Net income	$ 1,772,387	$ 1,437,325
Net income per share-basic	$ 0.36	$ 0.29
Net income per share-diluted	$ 0.36	$ 0.29

Equity Compensation Plans - Sum

Equity Compensation Plans - Summary of Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
2013 Plan [Member]
Number of Options
Beginning Balance | shares	0
Granted | shares	0
Exercised | shares	0
Expired | shares	0
Ending Balance | shares	0
Weighted Average Exercise Price
Beginning Balance | $ / shares	$ 0
Granted | $ / shares	0
Exercised | $ / shares	0
Expired | $ / shares	0
Ending Balance | $ / shares	$ 0
Directors Stock Option Plan [Member]
Number of Options
Beginning Balance | shares	63,000
Granted | shares	0
Exercised | shares	0
Expired | shares	0
Ending Balance | shares	63,000
Weighted Average Exercise Price
Beginning Balance | $ / shares	$ 20.96
Granted | $ / shares	0
Exercised | $ / shares	0
Expired | $ / shares	0
Ending Balance | $ / shares	$ 20.96

Equity Compensation Plans - Add

Equity Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2018
Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding		$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants	7,500
Restricted stock vesting period	1 year
Restricted stock grant date fair value	$ 180,225
Restricted stock cost	15,018
Restricted stock, deferred taxes	$ 5,602
Directors Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding		107,910
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding		$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal corporate tax rate	21.00%	34.00%
Revaluation of net deferred tax assets as a result of the Tax Cuts and Jobs Act		$ 2,558,859

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 490,262,726	$ 516,006,296
Gross Unrealized Gains	342,833	1,101,494
Gross Unrealized Losses	20,710,957	12,061,413
Estimated Fair Value	469,894,602	505,046,377
Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	177,818,695	180,647,580
Gross Unrealized Losses	6,826,209	4,199,022
Estimated Fair Value	170,992,486	176,448,558
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	199,874,987	213,707,125
Gross Unrealized Gains	25,388	43,197
Gross Unrealized Losses	8,745,057	5,327,265
Estimated Fair Value	191,155,318	208,423,057
State, County and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	109,703,750	118,786,297
Gross Unrealized Gains	99,882	849,364
Gross Unrealized Losses	5,139,691	2,535,126
Estimated Fair Value	104,663,941	117,100,535
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,865,294	2,865,294
Gross Unrealized Gains	217,563	208,933
Estimated Fair Value	$ 3,082,857	$ 3,074,227

Securities - Amortized Cost a28

Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale, Amortized Cost
Due in one year or less	$ 3,074,035	$ 3,398,727
Due after one year through five years	97,798,708	75,887,288
Due after five years through ten years	31,372,044	55,691,854
Due after ten years	358,017,939	381,028,427
Amortized Cost	490,262,726	516,006,296
Available-for-sale, Estimated Fair Value
Due in one year or less	3,081,588	3,421,576
Due after one year through five years	94,415,999	74,589,829
Due after five years through ten years	30,271,799	54,740,055
Due after ten years	342,125,216	372,294,917
Total Fair Value	$ 469,894,602	$ 505,046,377

Securities - Summary of Unreali

Securities - Summary of Unrealized Loss Information for Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 126,272,862	$ 111,299,318
Less than 12 months Unrealized Losses	4,365,598	1,895,666
12 months or more Fair Value	324,297,350	344,493,101
12 months or more Unrealized Losses	16,345,359	10,165,747
Total Fair Value	450,570,212	455,792,419
Total Unrealized Losses	20,710,957	12,061,413
Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	15,177,232	15,681,866
Less than 12 months Unrealized Losses	494,132	223,534
12 months or more Fair Value	155,715,253	160,766,691
12 months or more Unrealized Losses	6,332,077	3,975,488
Total Fair Value	170,892,485	176,448,557
Total Unrealized Losses	6,826,209	4,199,022
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	85,334,413	88,499,852
Less than 12 months Unrealized Losses	2,998,856	1,613,091
12 months or more Fair Value	103,673,842	116,753,236
12 months or more Unrealized Losses	5,746,201	3,714,175
Total Fair Value	189,008,255	205,253,088
Total Unrealized Losses	8,745,057	5,327,266
State, County and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	25,761,217	7,117,600
Less than 12 months Unrealized Losses	872,610	59,041
12 months or more Fair Value	64,908,255	66,973,174
12 months or more Unrealized Losses	4,267,081	2,476,084
Total Fair Value	90,669,472	74,090,774
Total Unrealized Losses	$ 5,139,691	$ 2,535,125

Loans - Composition of Net Loan

Loans - Composition of Net Loans (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans	$ 408,330,000	$ 405,605,000
Unearned Income	(148,000)	(195,000)
Allowance for Loan Losses	(2,725,441)	(3,019,228)	$ (3,701,914)	$ (3,902,796)
Loans, net	405,457,118	402,390,574
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	336,216,000	330,489,000
Total Gross Loans	336,216,000	330,489,000
Allowance for Loan Losses	(2,047,859)	(2,151,715)	(2,842,672)	(3,117,134)
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	29,219,000	25,923,000
Total Gross Loans	29,219,000	25,923,000
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,364,000	16,905,000
Total Gross Loans	16,364,000	16,905,000
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	90,823,000	95,925,000
Total Gross Loans	90,823,000	95,925,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	199,810,000	191,736,000
Total Gross Loans	199,810,000	191,736,000
Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	57,789,000	59,126,000
Total Gross Loans	57,789,000	59,126,000
Allowance for Loan Losses	(181,406)	(346,781)	(365,435)	(257,554)
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	56,838,000	58,204,000
Total Gross Loans	56,838,000	58,204,000
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	951,000	922,000
Total Gross Loans	951,000	922,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	14,325,000	15,990,000
Total Gross Loans	14,325,000	15,990,000
Allowance for Loan Losses	(496,176)	(520,732)	$ (493,807)	$ (528,108)
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,230,000	1,310,000
Total Gross Loans	1,230,000	1,310,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,095,000	14,680,000
Total Gross Loans	$ 13,095,000	$ 14,680,000

Loans - Period-End Non-Accrual

Loans - Period-End Non-Accrual Loans, Segregated by Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	$ 7,697	$ 7,582
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	7,482	7,388
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	416
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	353	366
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	1,950	2,131
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	4,763	4,891
Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	140	110
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	50	32
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	90	78
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	75	84
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	$ 75	$ 84

Loans - Aging Analysis of Past

Loans - Aging Analysis of Past Due Loans, Segregated by Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	$ 14,816	$ 6,114
Total Past Due Loans	15,239	6,982
Current Loans	393,091	398,623
Total Gross Loans	408,330	405,605
Accruing Loans 90 or more Days Past Due	8	813
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	13,679	5,616
Total Past Due Loans	13,978	6,478
Current Loans	322,238	324,011
Total Gross Loans	336,216	330,489
Accruing Loans 90 or more Days Past Due		807
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	437	281
Total Past Due Loans	437	281
Current Loans	28,782	25,642
Total Gross Loans	29,219	25,923
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	286	93
Total Past Due Loans	311	93
Current Loans	16,053	16,812
Total Gross Loans	16,364	16,905
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	2,611	2,657
Total Past Due Loans	2,877	2,657
Current Loans	87,946	93,268
Total Gross Loans	90,823	95,925
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	10,345	2,585
Total Past Due Loans	10,353	3,447
Current Loans	189,457	188,289
Total Gross Loans	199,810	191,736
Accruing Loans 90 or more Days Past Due		807
Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	733	51
Total Past Due Loans	769	51
Current Loans	57,020	59,075
Total Gross Loans	57,789	59,126
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	660	32
Total Past Due Loans	677	32
Current Loans	56,161	58,172
Total Gross Loans	56,838	58,204
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	73	19
Total Past Due Loans	92	19
Current Loans	859	903
Total Gross Loans	951	922
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	404	447
Total Past Due Loans	492	453
Current Loans	13,833	15,537
Total Gross Loans	14,325	15,990
Accruing Loans 90 or more Days Past Due	8	6
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	16	25
Total Past Due Loans	26	31
Current Loans	1,204	1,279
Total Gross Loans	1,230	1,310
Accruing Loans 90 or more Days Past Due		6
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	388	422
Total Past Due Loans	466	422
Current Loans	12,629	14,258
Total Gross Loans	13,095	14,680
Accruing Loans 90 or more Days Past Due	8
Loans 90 or more Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	423	868
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	299	862
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	25
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	266
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	8	862
Loans 90 or more Days Past Due [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	36
Loans 90 or more Days Past Due [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	17
Loans 90 or more Days Past Due [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	19
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	88	6
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	10	$ 6
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 78

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum loan limit considered for impairment evaluation by management	$ 100,000
Restructured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 174,274	$ 174,274

Loans - Impaired Loans, Segrega

Loans - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 7,564	$ 7,669
Recorded Investment With No Allowance	3,138	3,206
Recorded Investment With Allowance	4,426	4,463
Total Recorded Investment	7,564	7,669
Related Allowance	460	443
Average Recorded Investment	7,617	6,162
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	7,514	7,619
Recorded Investment With No Allowance	3,088	3,156
Recorded Investment With Allowance	4,426	4,463
Total Recorded Investment	7,514	7,619
Related Allowance	460	443
Average Recorded Investment	7,567	6,137
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	222	222
Recorded Investment With Allowance	222	222
Total Recorded Investment	222	222
Related Allowance	40	0
Average Recorded Investment	222	111
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	248	252
Recorded Investment With No Allowance	248	252
Total Recorded Investment	248	252
Average Recorded Investment	250	126
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,329	1,344
Recorded Investment With No Allowance	1,128	1,141
Recorded Investment With Allowance	201	203
Total Recorded Investment	1,329	1,344
Related Allowance	37	46
Average Recorded Investment	1,337	906
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5,715	5,801
Recorded Investment With No Allowance	1,712	1,763
Recorded Investment With Allowance	4,003	4,038
Total Recorded Investment	5,715	5,801
Related Allowance	383	397
Average Recorded Investment	5,758	4,994
Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	50	50
Recorded Investment With No Allowance	50	50
Total Recorded Investment	50	50
Average Recorded Investment	50	25
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	50	50
Recorded Investment With No Allowance	50	50
Total Recorded Investment	50	50
Average Recorded Investment	$ 50	$ 25

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructurings Segregated by Class (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)Loan	Dec. 31, 2017USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	3
Post-Modification Outstanding Recorded Investment	$ 2,984	$ 3,047
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	3
Pre-Modification Outstanding Recorded Investment	$ 4,871	$ 4,871
Post-Modification Outstanding Recorded Investment	$ 2,984	$ 3,047
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	3
Pre-Modification Outstanding Recorded Investment	$ 4,871	$ 4,871
Post-Modification Outstanding Recorded Investment	$ 2,984	$ 3,047

Loans - Changes in Troubled Deb

Loans - Changes in Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)Loan	Dec. 31, 2017USD ($)Loan
Receivables [Abstract]
Number of Loans | Loan	3	3
Principal paydowns, Recorded Investment	$ (63)
Post-Modification Outstanding Recorded Investment	$ 2,984	$ 3,047

Loans - Detailed Amount of Gros

Loans - Detailed Amount of Gross Loans Segregated by Loan Grade and Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 408,330	$ 405,605
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	336,216	330,489
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	29,219	25,923
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	16,364	16,905
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	90,823	95,925
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	199,810	191,736
Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	57,789	59,126
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	56,838	58,204
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	951	922
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	14,325	15,990
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,230	1,310
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	13,095	14,680
Satisfactory 1, 2, 3, 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	338,919	336,366
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	270,310	264,714
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	26,669	23,720
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	14,997	15,496
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	80,294	82,227
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	148,350	143,271
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	54,586	55,934
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	53,700	55,081
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	886	853
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	14,023	15,718
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,220	1,304
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	12,803	14,414
Special Mention 5,6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	39,927	53,011
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	38,824	49,941
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,550	2,116
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	372	377
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,517	5,615
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	34,385	41,833
Special Mention 5,6 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	993	2,999
Special Mention 5,6 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	986	2,990
Special Mention 5,6 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	7	9
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	110	71
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	110	71
Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	29,426	16,170
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	27,082	15,834
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,000	87
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	995	1,032
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	8,012	8,083
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	17,075	6,632
Substandard 7 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,210	193
Substandard 7 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,152	133
Substandard 7 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	58	60
Substandard 7 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	134	143
Substandard 7 [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	10	6
Substandard 7 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	124	137
Doubtful 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	58	58
Doubtful 8 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	58	58
Doubtful 8 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 58	$ 58

Loans - Detailed Activity in Al

Loans - Detailed Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 3,019,228	$ 3,902,796
(Reversal of) provision for loan losses	(236,773)	(151,220)
Chargeoffs	129,237	84,003
Recoveries	72,223	34,341
Net chargeoffs (recoveries)	57,014	49,662
Ending Balance	2,725,441	3,701,914
Loans individually evaluated for impairment			$ 459,359	$ 710,737
Loans collectively evaluated for impairment			2,266,082	2,991,177
Ending Balance	2,725,441	3,701,914	2,725,441	3,701,914
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,151,715	3,117,134
(Reversal of) provision for loan losses	(65,925)	(282,820)
Chargeoffs	83,045	4,107
Recoveries	45,114	12,465
Net chargeoffs (recoveries)	37,931	(8,358)
Ending Balance	2,047,859	2,842,672
Loans individually evaluated for impairment			459,359	649,449
Loans collectively evaluated for impairment			1,588,500	2,193,223
Ending Balance	2,047,859	2,842,672	2,047,859	2,842,672
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	346,781	257,554
(Reversal of) provision for loan losses	(150,889)	175,477
Chargeoffs	15,347	67,850
Recoveries	861	254
Net chargeoffs (recoveries)	14,486	67,596
Ending Balance	181,406	365,435
Loans individually evaluated for impairment				61,288
Loans collectively evaluated for impairment			181,406	304,147
Ending Balance	181,406	365,435	181,406	365,435
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	520,732	528,108
(Reversal of) provision for loan losses	(19,959)	(43,877)
Chargeoffs	30,845	12,046
Recoveries	26,248	21,622
Net chargeoffs (recoveries)	4,597	(9,576)
Ending Balance	496,176	493,807
Loans collectively evaluated for impairment			496,176	493,807
Ending Balance	$ 496,176	$ 493,807	$ 496,176	$ 493,807

Loans - Recorded Investment in

Loans - Recorded Investment in Loans Related to Balance in Allowance for Possible Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment	$ 7,564	$ 4,396
Loans collectively evaluated for general impairment	400,766	401,209
Total Gross Loans	408,330	405,605
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment	7,514	4,396
Loans collectively evaluated for general impairment	328,702	326,093
Total Gross Loans	336,216	330,489
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment	50
Loans collectively evaluated for general impairment	57,739	59,126
Total Gross Loans	57,789	59,126
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans collectively evaluated for general impairment	14,325	15,990
Total Gross Loans	$ 14,325	$ 15,990

Fair Value of Financial Instr40

Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 469,894,602	$ 505,046,377
Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	170,992,486	176,448,558
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	191,155,318	208,423,057
State, County and Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	104,663,941	117,100,535
Other Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,082,857	3,074,227
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	466,811,745	501,972,150
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,082,857	3,074,227
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	469,894,602	505,046,377
Fair Value, Measurements, Recurring [Member] | Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	170,992,486	176,448,558
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	191,155,318	208,423,057
Fair Value, Measurements, Recurring [Member] | State, County and Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	104,663,941	117,100,535
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,082,857	3,074,227
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]
Securities available for sale	466,811,745	501,972,150
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	170,992,486	176,448,558
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	191,155,318	208,423,057
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State, County and Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	104,663,941	117,100,535
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,082,857	3,074,227
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 3,082,857	$ 3,074,227

Fair Value of Financial Instr41

Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Beginning Balance	$ 3,074,227	$ 2,971,106
Principal payments received		(4,466)
Unrealized gains included in other comprehensive income	8,630	19,119
Ending Balance	$ 3,082,857	$ 2,985,759

Fair Value of Financial Instr42

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains or losses in earnings attributable to the change in unrealized gains or losses	$ 0	$ 0
Carrying value of an impaired loan	7,564,000	7,669,000
Impaired loans, allowance for loan losses	460,000	443,000
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned acquired	100,109	88,579
Additional write downs on OREO previously acquired	$ 0	$ 413,740

Fair Value of Financial Instr43

Fair Value of Financial Instruments - Significant Unobservable Inputs (Level 3) used in Valuation of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 3,082,857	$ 3,074,227	$ 2,985,759	$ 2,971,106
Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 3,082,857
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique	Discounted cash flows
Minimum [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Default rate	0.00%
Maximum [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Default rate	100.00%

Fair Value of Financial Instr44

Fair Value of Financial Instruments - Asset Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring Basis	$ 182,250	$ 1,851,752
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring Basis	182,250	544,502
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring Basis		1,307,250
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring Basis	182,250	1,851,752
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring Basis	$ 182,250	544,502
Significant Unobservable Inputs (Level 3) [Member] | Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring Basis		$ 1,307,250

Fair Value of Financial Instr45

Fair Value of Financial Instruments - Significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a nonrecurring basis (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 182,250	$ 1,851,752
Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 182,250	$ 544,502
Valuation Technique	Appraised value of collateral less estimated costs to sell
Estimated costs to sell	25.00%

Fair Value of Financial Instr46

Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Financial assets
Cash and due from banks	$ 13,190,006	$ 17,962,990
Interest bearing deposits with banks	20,125,134	1,532,420
Securities available-for-sale	469,894,602	505,046,377
Net loans	402,515,468	401,706,081
Financial liabilities
Deposits	785,760,906	720,821,564
Federal Home Loan Bank advances		30,005,541
Securities Sold under Agreement to Repurchase	98,843,862	142,497,938
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Cash and due from banks	13,190,006	17,962,990
Interest bearing deposits with banks	20,125,134	1,532,420
Financial liabilities
Deposits	579,505,950	543,123,284
Securities Sold under Agreement to Repurchase	98,843,862	142,497,938
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Securities available-for-sale	466,811,745	501,972,150
Significant Unobservable Inputs (Level 3) [Member]
Financial assets
Securities available-for-sale	3,082,857	3,074,227
Net loans	402,515,468	401,706,081
Financial liabilities
Deposits	206,254,956	177,698,280
Federal Home Loan Bank advances		30,005,541
Carrying Value [Member]
Financial assets
Cash and due from banks	13,190,006	17,962,990
Interest bearing deposits with banks	20,125,134	1,532,420
Securities available-for-sale	469,894,602	505,046,377
Net loans	405,457,118	402,390,574
Financial liabilities
Deposits	785,627,083	720,685,499
Federal Home Loan Bank advances		30,000,000
Securities Sold under Agreement to Repurchase	$ 98,843,862	$ 142,497,938