Citizens Holding (CIZN) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 06, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
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		4,904,530

Consolidated Financial Statemen

Consolidated Financial Statements - USD ($)	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 12,641,231	$ 17,962,990
Interest bearing deposits with other banks	1,293,179	1,532,420
Investment securities available for sale, at fair value	463,752,185	505,046,377
Loans, net of allowance for loan losses of $3,027,950 in 2018 and $3,019,228 in 2017	417,589,558	402,390,574
Premises and equipment, net	19,894,685	20,571,551
Other real estate owned, net	3,312,484	3,980,127
Accrued interest receivable	4,297,013	4,450,723
Cash surrender value of life insurance	24,977,849	24,612,779
Deferred tax assets, net	7,518,048	5,362,750
Other assets	7,793,327	7,185,537
TOTAL ASSETS	963,069,559	993,095,828
Deposits:
Noninterest-bearing demand	160,581,057	159,291,356
Interest-bearing NOW and money market accounts	333,739,645	306,047,053
Savings deposits	79,274,222	77,784,876
Certificates of deposit	191,016,056	177,562,214
Total deposits	764,610,980	720,685,499
Securities sold under agreement to repurchase	74,124,947	142,497,938
Federal Funds Purchased	12,500,000	1,500,000
Federal Home Loan Bank advances	20,000,000	30,000,000
Accrued interest payable	194,431	198,183
Deferred compensation payable	8,820,103	8,620,890
Other liabilities	1,137,728	1,142,278
Total liabilities	881,388,189	904,644,788
SHAREHOLDERS' EQUITY
Common stock; $0.20 par value, 22,500,000 shares authorized, 4,904,530 shares issued and outstanding at June 30, 2018 and 4,894,705 shares issued and outstanding at December 31, 2017	980,906	978,941
Additional paid-in capital	4,215,811	4,103,139
Retained earnings	92,703,089	91,594,379
Accumulated other comprehensive loss, net of tax benefit of $5,391,738 in 2018 and $2,734,500 in 2017	(16,218,436)	(8,225,419)
Total shareholders' equity	81,681,370	88,451,040
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 963,069,559	$ 993,095,828

Consolidated Financial Stateme3

Consolidated Financial Statements (Parenthetical) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Loans, allowance for loan losses	$ 3,027,950	$ 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	4,904,530	4,894,705
Common stock, shares outstanding	4,904,530	4,894,705
Accumulated other comprehensive loss, tax benefits	$ 5,391,738	$ 2,734,500

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST INCOME
Loans, including fees	$ 4,984,492	$ 4,863,971	$ 9,700,911	$ 9,432,050
Investment securities	2,734,424	2,919,236	5,557,112	5,751,687
Other interest	60,060	59,086	120,344	127,633
Total interest income	7,778,976	7,842,293	15,378,367	15,311,370
INTEREST EXPENSE
Deposits	515,506	486,003	1,016,715	963,645
Other borrowed funds	311,034	343,814	604,466	673,619
Total interest expense	826,540	829,817	1,621,181	1,637,264
NET INTEREST INCOME	6,952,436	7,012,476	13,757,186	13,674,106
PROVISION FOR (REVERSAL OF) LOAN LOSSES	88,962	(29,586)	(147,811)	(180,806)
NET INTEREST INCOME AFTER PROVISION FOR (REVERSAL OF) LOAN LOSSES	6,863,474	7,042,062	13,904,997	13,854,912
OTHER INCOME
Other operating income	294,097	430,349	582,470	705,806
Total other income	2,078,410	2,123,192	4,178,840	4,057,452
OTHER EXPENSES
Salaries and employee benefits	3,675,422	3,745,433	7,343,279	7,409,237
Occupancy expense	1,361,622	1,338,630	2,887,001	2,648,873
Other operating expense	1,910,845	1,826,548	3,765,290	3,961,657
Total other expenses	6,947,889	6,910,611	13,995,570	14,019,767
INCOME BEFORE PROVISION FOR INCOME TAXES	1,993,995	2,254,643	4,088,267	3,892,597
PROVISION FOR INCOME TAXES	305,855	471,190	627,740	671,819
NET INCOME	$ 1,688,140	$ 1,783,453	$ 3,460,527	$ 3,220,778
NET INCOME PER SHARE -Basic	$ 0.35	$ 0.37	$ 0.71	$ 0.66
NET INCOME PER SHARE -Diluted	0.35	0.36	0.71	0.66
DIVIDENDS PAID PER SHARE	$ 0.24	$ 0.24	$ 0.48	$ 0.48
Deposit Account [Member]
OTHER INCOME
Other income	$ 1,067,260	$ 1,019,372	$ 2,210,853	$ 2,061,403
Financial Service, Other [Member]
OTHER INCOME
Other income	$ 717,053	$ 673,471	$ 1,385,517	$ 1,290,243

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,688,140	$ 1,783,453	$ 3,460,527	$ 3,220,778
Securities available-for-sale
Unrealized holding (losses) gains	(1,245,076)	6,111,996	(10,661,302)	10,516,085
Income tax effect	310,646	(2,279,774)	2,659,994	(3,922,499)
Net unrealized gains	(934,430)	3,832,222	(8,001,308)	6,593,586
Reclassification adjustment for gains included in net income	3,026	89,096	11,047	89,096
Income tax effect	(755)	(33,233)	(2,756)	(33,233)
Net gains included in net income	2,271	55,863	8,291	55,863
Total other comprehensive (loss) income	(932,159)	3,888,085	(7,993,017)	6,649,449
Comprehensive income (loss)	$ 755,981	$ 5,671,538	$ (4,532,490)	$ 9,870,227

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash provided by operating activities	$ 5,402,261	$ 4,972,412
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from maturities and calls of securities available for sale	21,903,064	21,382,709
Proceeds from sale of investment securities	17,609,891	24,502,095
Purchases of investment securities available for sale	(10,550,000)	(70,927,550)
Purchases of bank premises and equipment	(48,702)	(2,139,487)
Sales of bank premises and equipment	264,000
Decrease in interest bearing deposits with other banks	239,241	39,794,411
Purchase of Federal Home Loan Bank stock		(498,700)
Proceeds from sale of other real estate	782,095	127,722
Net (increase) decrease in loans	(15,151,283)	677,105
Net cash provided by investing activities	15,048,306	12,918,305
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	43,925,481	19,771,233
Net change in securities sold under agreement to repurchase	(68,372,991)	(35,025,549)
Increase in Federal Funds Purchased	11,000,000
Repayment of Federal Home Loan Bank advances	(10,000,000)
Proceeds from exercise of stock options	27,000	92,625
Payment of dividends	(2,351,816)	(2,347,598)
Net cash used in financing activities	(25,772,326)	(17,509,289)
Net (decrease) increase in cash and due from banks	(5,321,759)	381,428
Cash and due from banks, beginning of period	17,962,990	21,688,557
Cash and due from banks, end of period	$ 12,641,231	$ 22,069,985

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 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 June 30, 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 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”). 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	6 Months Ended
	Jun. 30, 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 June 30, 2018, the Corporation had entered into loan commitments with certain customers with an aggregate unused balance of $59,126,558 compared to an aggregate unused balance of $46,405,869 at December 31, 2017. There were $2,549,810 of letters of credit outstanding at June 30, 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	6 Months Ended
	Jun. 30, 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 June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 Basic weighted average shares outstanding 4,889,772 4,878,986 4,886,258 4,874,565 Dilutive effect of granted options 5,020 11,064 7,729 18,777 Diluted weighted average shares outstanding 4,894,792 4,890,050 4,893,987 4,893,342 Net income $ 1,688,140 $ 1,783,453 $ 3,460,527 $ 3,220,778 Net income per share-basic $ 0.35 $ 0.37 $ 0.71 $ 0.66 Net income per share-diluted $ 0.35 $ 0.36 $ 0.71 $ 0.66

Equity Compensation Plans

Equity Compensation Plans	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2018. Directors’ Plan 2013 Plan Number Weighted Number Weighted Outstanding at December 31, 2017 63,000 $ 20.96 — $ — Granted — — — — Exercised (6,000 ) 18.00 — — Expired (4,500 ) 18.00 — — Outstanding at June 30, 2018 52,500 $ 21.55 — $ — The intrinsic value of options outstanding under the Directors’ Plan at June 30, 2018, was $141,570. No options were outstanding under the 2013 Plan or the Employee’s Plan as of June 30, 2018. During the quarter ended June 30, 2018, 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	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 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	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	Note 6. Securities The amortized cost and estimated fair value of securities available-for-sale June 30, 2018 Amortized Gross Gross Estimated Securities available-for-sale Obligations of U.S. Government agencies $ 99,566,635 $ — $ 4,269,911 $ 95,296,724 Mortgage backed securities 278,584,218 6,438 12,561,575 266,029,081 State, County, Municipals 107,211,506 78,334 4,863,460 102,426,380 Total $ 485,362,359 $ 84,772 $ 21,694,946 $ 463,752,185 December 31, 2017 Amortized Unrealized Unrealized Estimated 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 During the 2 nd The amortized cost and estimated fair value of securities by contractual maturity at June 30, 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. June 30, 2018 December 31, 2017 Amortized Estimated Amortized Estimated Available-for-sale Due in one year or less $ 1,817,972 $ 1,820,005 $ 3,398,727 $ 3,421,576 Due after one year through five years 97,858,493 94,124,451 75,887,288 74,589,829 Due after five years through ten years 31,088,580 29,855,611 55,691,854 54,740,055 Due after ten years 354,597,314 337,952,118 381,028,427 372,294,917 Total $ 485,362,359 $ 463,752,185 $ 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, June 30, 2018 Less than 12 months 12 months or more Total Description of Securities Fair Unrealized Fair Unrealized Fair Unrealized Obligations of U.S. government agencies $ 15,119,779 $ 647,021 $ 80,176,945 $ 3,622,890 $ 95,296,724 $ 4,269,911 Mortgage backed securities 93,958,426 3,434,432 171,878,931 9,127,143 265,837,357 12,561,575 State, County, Municipal 25,411,940 806,404 64,746,595 4,057,056 90,158,535 4,863,460 Total $ 134,490,145 $ 4,887,857 $ 316,802,471 $ 16,807,089 $ 451,292,616 $ 21,694,946 December 31, 2017 Less than 12 months 12 months or more Total Description of Securities Fair Unrealized Fair Unrealized Fair Unrealized 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	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Loans	Note 7. Loans The composition of net loans (in thousands) at June 30, 2018 and December 31, 2017 was as follows: June 30, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 37,360 $ 25,923 Farmland 15,889 16,905 1-4 88,627 95,925 Commercial Real Estate 196,715 191,736 Total Real Estate Loans 338,591 330,489 Business Loans: Commercial and Industrial Loans 66,382 58,204 Farm Production and Other Farm Loans 999 922 Total Business Loans 67,381 59,126 Consumer Loans: Credit Cards 1,342 1,310 Other Consumer Loans 13,408 14,680 Total Consumer Loans 14,750 15,990 Total Gross Loans 420,722 405,605 Unearned Income (105 ) (195 ) Allowance for Loan Losses (3,028 ) (3,019 ) Loans, net $ 417,589 $ 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 June 30, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 420 $ — Farmland 272 366 1-4 1,927 2,131 Commercial Real Estate 4,279 4,891 Total Real Estate Loans 6,898 7,388 Business Loans: Commercial and Industrial Loans 83 78 Farm Production and Other Farm Loans 31 32 Total Business Loans 114 110 Consumer Loans: Other Consumer Loans 71 84 Total Consumer Loans 71 84 Total Nonaccrual Loans $ 7,083 $ 7,582 An aging analysis of past due loans (in thousands), segregated by class, as of June 30, 2018, was as follows: Loans 30-89 Days Loans Total Past Current Total Accruing Real Estate: Land Development and Construction $ 16 $ 420 $ 436 $ 36,924 $ 37,360 $ — Farmland 294 32 326 15,563 15,889 — 1-4 1,978 255 2,233 86,394 88,627 — Commercial Real Estate 2,635 1,150 3,785 192,930 196,715 — Total Real Estate Loans 4,923 1,857 6,780 331,811 338,591 — Business Loans: Commercial and Industrial Loans 154 — 154 66,228 66,382 — Farm Production and Other Farm Loans — — — 999 999 — Total Business Loans 154 — 154 67,227 67,381 — Consumer Loans: Credit Cards 40 10 50 1,292 1,342 10 Other Consumer Loans 311 58 369 13,039 13,408 8 Total Consumer Loans 351 68 419 14,331 14,750 18 Total Loans $ 5,428 $ 1,925 $ 7,353 $ 413,369 $ 420,722 $ 18 An aging analysis of past due loans (in thousands), segregated by class, as of December 31, 2017 was as follows: Loans 30-89 Days Loans Total Current Total Accruing 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 June 30, 2018, segregated by class, were as follows: Unpaid Recorded Recorded Total Related Average Real Estate: Land Development and Construction $ 420 $ — $ 420 $ 420 $ 112 $ 321 Farmland 272 272 — 272 — 262 1-4 1,232 1,034 198 1,232 33 1,288 Commercial Real Estate 5,686 1,739 3,947 5,686 384 5,744 Total Real Estate Loans 7,610 3,045 4,565 7,610 529 7,615 Business Loans: Farm Production and Other Farm Loans — — — — — 25 Total Business Loans — — — — — 25 Total Loans $ 7,610 $ 3,045 $ 4,565 $ 7,610 $ 529 $ 7,640 Impaired loans (in thousands) as of December 31, 2017, segregated by class, were as follows: Unpaid Recorded Recorded Total Related Average Real Estate: Land Development and Construction $ 222 $ — $ 222 $ 222 $ — $ 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: June 30, 2018 Number of Pre-Modification Post-Modification Commercial real estate 3 $ 4,871 $ 2,998 Total 3 $ 4,871 $ 2,998 December 31, 2017 Number of Pre-Modification Post-Modification 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 of Recorded Totals at January 1, 2018 3 $ 3,047 Reductions due to: Principal paydowns (49 ) Total at June 30, 2018 3 $ 2,998 The allocated allowance for loan losses attributable to restructured loans was $174,274 at June 30, 2018 and December 31, 2017. The Corporation had no remaining availability under commitments to lend additional funds on these troubled debt restructurings as of June 30, 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 June 30, 2018. The following table details the amount of gross loans (in thousands), segregated by loan grade and class, as of June 30, 2018: Satisfactory Special Substandard Doubtful Loss Total Real Estate: Land Development and Construction $ 35,479 $ 881 $ 1,000 $ — $ — $ 37,360 Farmland 14,488 367 1,034 — — 15,889 1-4 78,362 2,482 7,783 — — 88,627 Commercial Real Estate 157,962 28,584 10,169 — — 196,715 Total Real Estate Loans 286,291 32,314 19,986 — — 338,591 Business Loans: Commercial and Industrial Loans 63,280 995 2,107 — — 66,382 Farm Production and Other Farm Loans 958 5 36 — — 999 Total Business Loans 64,238 1,000 2,143 — — 67,381 Consumer Loans: Credit Cards 1,332 — 10 — — 1,342 Other Consumer Loans 13,167 84 99 58 — 13,408 Total Consumer Loans 14,499 84 109 58 — 14,750 Total Loans $ 365,028 $ 33,398 $ 22,238 $ 58 $ — $ 420,722 The following table details the amount of gross loans (in thousands) segregated by loan grade and class, as of December 31, 2017: Satisfactory Special Substandard Doubtful Loss Total 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 six months ended June 30, 2018: June 30, 2018 Real Business Consumer Total Beginning Balance, January 1, 2018 $ 2,151,715 $ 346,781 $ 520,732 $ 3,019,228 Provision for (reversal of) loan losses 481,714 (410,727 ) (218,798 ) (147,811 ) Chargeoffs 98,644 15,347 59,355 173,346 Recoveries 82,114 197,321 50,444 329,879 Net chargeoffs (recoveries) 16,530 (181,974 ) 8,911 (156,533 ) Ending Balance $ 2,616,899 $ 118,028 $ 293,023 $ 3,027,950 Period end allowance allocated to: Loans individually evaluated for impairment $ 528,937 $ — $ — $ 528,937 Loans collectively evaluated for impairment 2,087,962 118,028 293,023 2,499,013 Ending Balance, June 30, 2018 $ 2,616,899 $ 118,028 $ 293,023 $ 3,027,950 The following table details activity in the allowance for loan losses by portfolio segment for the six months ended June 30, 2017: June 30, 2017 Real Business Consumer Total Beginning Balance, January 1, 2017 $ 3,117,134 $ 257,554 $ 528,108 $ 3,902,796 (Reversal of) provision for loan losses (271,448 ) 153,428 (62,786 ) (180,806 ) Chargeoffs 117,157 128,207 21,536 266,900 Recoveries 19,397 273 31,246 50,916 Net chargeoffs (recoveries) 97,760 127,934 (9,710 ) 215,984 Ending Balance $ 2,747,926 $ 283,048 $ 475,032 $ 3,506,006 Period end allowance allocated to: Loans individually evaluated for impairment $ 547,621 $ — $ — $ 547,621 Loans collectively evaluated for impairment 2,200,305 283,048 475,032 2,958,385 Ending Balance, June 30, 2017 $ 2,747,926 $ 283,048 $ 475,032 $ 3,506,006 The Corporation’s recorded investment in loans as of June 30, 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): June 30, 2018 Real Business Consumer Total Loans individually evaluated for specific impairment $ 7,610 $ — $ — $ 7,610 Loans collectively evaluated for general impairment 330,981 67,381 14,750 413,112 $ 338,591 $ 67,381 $ 14,750 $ 420,722 December 31, 2017 Real Business Consumer Total 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	6 Months Ended
	Jun. 30, 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 June 30, 2018: 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 $ — $ 95,296,724 $ — $ 95,296,724 Mortgage-backed securities — 266,029,081 — 266,029,081 State, county and municipal obligations — 102,426,380 — 102,426,380 Total $ — $ 463,752,185 $ — $ 463,752,185 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 Structured Financial Product As of June 30, 2018 2017 Beginning Balance $ 3,074,227 $ 2,971,106 Sales (2,865,294 ) — Principal payments received — (5,067 ) Unrealized (loss) gains included in other comprehensive income (208,933 ) 39,303 Ending Balance $ — $ 3,005,342 The Corporation recorded no gains or losses in earnings for the period ended June 30, 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. For assets measured at fair value on a nonrecurring basis during 2018 that were still held on the Corporation’s balance sheet at June 30, 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 $ — $ — $ 305,297 $ 305,297 Total $ — $ — $ 305,297 $ 305,297 The following table presents information as of June 30, 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 Inputs Range of Inputs Impaired loans $305,297 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 $7,609,500 and $7,668,908 had an allocated allowance for loan losses of $528,937 and $442,589 at June 30, 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 six-month 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 June 30, 2018: Fair Value Measurements Using: June 30, 2018 Carrying Quoted Prices Significant Significant Total (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 12,641,231 $ 12,641,231 $ — $ — $ 12,641,231 Interest bearing deposits with banks 1,293,179 1,293,179 — — 1,293,179 Securities available-for-sale 463,752,185 — 463,752,185 — 463,752,185 Net loans 417,589,558 — — 413,544,127 413,544,127 Financial liabilities Deposits $ 764,610,980 $ — $ 764,674,148 $ — $ 764,674,148 Federal Funds Purchased 12,500,000 12,500,000 — — 12,500,000 Federal Home Loan Bank advances 20,000,000 — 20,000,000 — 20,000,000 Securities Sold under Agreement to Repurchase 74,124,947 — 74,124,947 — 74,124,947 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 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)	6 Months Ended
	Jun. 30, 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 June 30, 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 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”). 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)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Net income per share was computed as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 Basic weighted average shares outstanding 4,889,772 4,878,986 4,886,258 4,874,565 Dilutive effect of granted options 5,020 11,064 7,729 18,777 Diluted weighted average shares outstanding 4,894,792 4,890,050 4,893,987 4,893,342 Net income $ 1,688,140 $ 1,783,453 $ 3,460,527 $ 3,220,778 Net income per share-basic $ 0.35 $ 0.37 $ 0.71 $ 0.66 Net income per share-diluted $ 0.35 $ 0.36 $ 0.71 $ 0.66

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2018. Directors’ Plan 2013 Plan Number Weighted Number Weighted Outstanding at December 31, 2017 63,000 $ 20.96 — $ — Granted — — — — Exercised (6,000 ) 18.00 — — Expired (4,500 ) 18.00 — — Outstanding at June 30, 2018 52,500 $ 21.55 — $ —

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2018 Amortized Gross Gross Estimated Securities available-for-sale Obligations of U.S. Government agencies $ 99,566,635 $ — $ 4,269,911 $ 95,296,724 Mortgage backed securities 278,584,218 6,438 12,561,575 266,029,081 State, County, Municipals 107,211,506 78,334 4,863,460 102,426,380 Total $ 485,362,359 $ 84,772 $ 21,694,946 $ 463,752,185 December 31, 2017 Amortized Unrealized Unrealized Estimated 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 June 30, 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. June 30, 2018 December 31, 2017 Amortized Estimated Amortized Estimated Available-for-sale Due in one year or less $ 1,817,972 $ 1,820,005 $ 3,398,727 $ 3,421,576 Due after one year through five years 97,858,493 94,124,451 75,887,288 74,589,829 Due after five years through ten years 31,088,580 29,855,611 55,691,854 54,740,055 Due after ten years 354,597,314 337,952,118 381,028,427 372,294,917 Total $ 485,362,359 $ 463,752,185 $ 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, June 30, 2018 Less than 12 months 12 months or more Total Description of Securities Fair Unrealized Fair Unrealized Fair Unrealized Obligations of U.S. government agencies $ 15,119,779 $ 647,021 $ 80,176,945 $ 3,622,890 $ 95,296,724 $ 4,269,911 Mortgage backed securities 93,958,426 3,434,432 171,878,931 9,127,143 265,837,357 12,561,575 State, County, Municipal 25,411,940 806,404 64,746,595 4,057,056 90,158,535 4,863,460 Total $ 134,490,145 $ 4,887,857 $ 316,802,471 $ 16,807,089 $ 451,292,616 $ 21,694,946 December 31, 2017 Less than 12 months 12 months or more Total Description of Securities Fair Unrealized Fair Unrealized Fair Unrealized 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)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Composition of Net Loans	The composition of net loans (in thousands) at June 30, 2018 and December 31, 2017 was as follows: June 30, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 37,360 $ 25,923 Farmland 15,889 16,905 1-4 88,627 95,925 Commercial Real Estate 196,715 191,736 Total Real Estate Loans 338,591 330,489 Business Loans: Commercial and Industrial Loans 66,382 58,204 Farm Production and Other Farm Loans 999 922 Total Business Loans 67,381 59,126 Consumer Loans: Credit Cards 1,342 1,310 Other Consumer Loans 13,408 14,680 Total Consumer Loans 14,750 15,990 Total Gross Loans 420,722 405,605 Unearned Income (105 ) (195 ) Allowance for Loan Losses (3,028 ) (3,019 ) Loans, net $ 417,589 $ 402,391
Period-End, Non-Accrual Loans, Segregated by Class	Period-end, non-accrual June 30, 2018 December 31, 2017 Real Estate: Land Development and Construction $ 420 $ — Farmland 272 366 1-4 1,927 2,131 Commercial Real Estate 4,279 4,891 Total Real Estate Loans 6,898 7,388 Business Loans: Commercial and Industrial Loans 83 78 Farm Production and Other Farm Loans 31 32 Total Business Loans 114 110 Consumer Loans: Other Consumer Loans 71 84 Total Consumer Loans 71 84 Total Nonaccrual Loans $ 7,083 $ 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 June 30, 2018, was as follows: Loans 30-89 Days Loans Total Past Current Total Accruing Real Estate: Land Development and Construction $ 16 $ 420 $ 436 $ 36,924 $ 37,360 $ — Farmland 294 32 326 15,563 15,889 — 1-4 1,978 255 2,233 86,394 88,627 — Commercial Real Estate 2,635 1,150 3,785 192,930 196,715 — Total Real Estate Loans 4,923 1,857 6,780 331,811 338,591 — Business Loans: Commercial and Industrial Loans 154 — 154 66,228 66,382 — Farm Production and Other Farm Loans — — — 999 999 — Total Business Loans 154 — 154 67,227 67,381 — Consumer Loans: Credit Cards 40 10 50 1,292 1,342 10 Other Consumer Loans 311 58 369 13,039 13,408 8 Total Consumer Loans 351 68 419 14,331 14,750 18 Total Loans $ 5,428 $ 1,925 $ 7,353 $ 413,369 $ 420,722 $ 18 An aging analysis of past due loans (in thousands), segregated by class, as of December 31, 2017 was as follows: Loans 30-89 Days Loans Total Current Total Accruing 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 June 30, 2018, segregated by class, were as follows: Unpaid Recorded Recorded Total Related Average Real Estate: Land Development and Construction $ 420 $ — $ 420 $ 420 $ 112 $ 321 Farmland 272 272 — 272 — 262 1-4 1,232 1,034 198 1,232 33 1,288 Commercial Real Estate 5,686 1,739 3,947 5,686 384 5,744 Total Real Estate Loans 7,610 3,045 4,565 7,610 529 7,615 Business Loans: Farm Production and Other Farm Loans — — — — — 25 Total Business Loans — — — — — 25 Total Loans $ 7,610 $ 3,045 $ 4,565 $ 7,610 $ 529 $ 7,640 Impaired loans (in thousands) as of December 31, 2017, segregated by class, were as follows: Unpaid Recorded Recorded Total Related Average Real Estate: Land Development and Construction $ 222 $ — $ 222 $ 222 $ — $ 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: June 30, 2018 Number of Pre-Modification Post-Modification Commercial real estate 3 $ 4,871 $ 2,998 Total 3 $ 4,871 $ 2,998 December 31, 2017 Number of Pre-Modification Post-Modification 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 of Recorded Totals at January 1, 2018 3 $ 3,047 Reductions due to: Principal paydowns (49 ) Total at June 30, 2018 3 $ 2,998
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 June 30, 2018: Satisfactory Special Substandard Doubtful Loss Total Real Estate: Land Development and Construction $ 35,479 $ 881 $ 1,000 $ — $ — $ 37,360 Farmland 14,488 367 1,034 — — 15,889 1-4 78,362 2,482 7,783 — — 88,627 Commercial Real Estate 157,962 28,584 10,169 — — 196,715 Total Real Estate Loans 286,291 32,314 19,986 — — 338,591 Business Loans: Commercial and Industrial Loans 63,280 995 2,107 — — 66,382 Farm Production and Other Farm Loans 958 5 36 — — 999 Total Business Loans 64,238 1,000 2,143 — — 67,381 Consumer Loans: Credit Cards 1,332 — 10 — — 1,342 Other Consumer Loans 13,167 84 99 58 — 13,408 Total Consumer Loans 14,499 84 109 58 — 14,750 Total Loans $ 365,028 $ 33,398 $ 22,238 $ 58 $ — $ 420,722 The following table details the amount of gross loans (in thousands) segregated by loan grade and class, as of December 31, 2017: Satisfactory Special Substandard Doubtful Loss Total 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 six months ended June 30, 2018: June 30, 2018 Real Business Consumer Total Beginning Balance, January 1, 2018 $ 2,151,715 $ 346,781 $ 520,732 $ 3,019,228 Provision for (reversal of) loan losses 481,714 (410,727 ) (218,798 ) (147,811 ) Chargeoffs 98,644 15,347 59,355 173,346 Recoveries 82,114 197,321 50,444 329,879 Net chargeoffs (recoveries) 16,530 (181,974 ) 8,911 (156,533 ) Ending Balance $ 2,616,899 $ 118,028 $ 293,023 $ 3,027,950 Period end allowance allocated to: Loans individually evaluated for impairment $ 528,937 $ — $ — $ 528,937 Loans collectively evaluated for impairment 2,087,962 118,028 293,023 2,499,013 Ending Balance, June 30, 2018 $ 2,616,899 $ 118,028 $ 293,023 $ 3,027,950 The following table details activity in the allowance for loan losses by portfolio segment for the six months ended June 30, 2017: June 30, 2017 Real Business Consumer Total Beginning Balance, January 1, 2017 $ 3,117,134 $ 257,554 $ 528,108 $ 3,902,796 (Reversal of) provision for loan losses (271,448 ) 153,428 (62,786 ) (180,806 ) Chargeoffs 117,157 128,207 21,536 266,900 Recoveries 19,397 273 31,246 50,916 Net chargeoffs (recoveries) 97,760 127,934 (9,710 ) 215,984 Ending Balance $ 2,747,926 $ 283,048 $ 475,032 $ 3,506,006 Period end allowance allocated to: Loans individually evaluated for impairment $ 547,621 $ — $ — $ 547,621 Loans collectively evaluated for impairment 2,200,305 283,048 475,032 2,958,385 Ending Balance, June 30, 2017 $ 2,747,926 $ 283,048 $ 475,032 $ 3,506,006
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 June 30, 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): June 30, 2018 Real Business Consumer Total Loans individually evaluated for specific impairment $ 7,610 $ — $ — $ 7,610 Loans collectively evaluated for general impairment 330,981 67,381 14,750 413,112 $ 338,591 $ 67,381 $ 14,750 $ 420,722 December 31, 2017 Real Business Consumer Total 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)	6 Months Ended
	Jun. 30, 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 June 30, 2018: 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 $ — $ 95,296,724 $ — $ 95,296,724 Mortgage-backed securities — 266,029,081 — 266,029,081 State, county and municipal obligations — 102,426,380 — 102,426,380 Total $ — $ 463,752,185 $ — $ 463,752,185 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 Structured Financial Product As of June 30, 2018 2017 Beginning Balance $ 3,074,227 $ 2,971,106 Sales (2,865,294 ) — Principal payments received — (5,067 ) Unrealized (loss) gains included in other comprehensive income (208,933 ) 39,303 Ending Balance $ — $ 3,005,342
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 June 30, 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 $ — $ — $ 305,297 $ 305,297 Total $ — $ — $ 305,297 $ 305,297 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 June 30, 2018: Fair Value Measurements Using: June 30, 2018 Carrying Quoted Prices Significant Significant Total (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 12,641,231 $ 12,641,231 $ — $ — $ 12,641,231 Interest bearing deposits with banks 1,293,179 1,293,179 — — 1,293,179 Securities available-for-sale 463,752,185 — 463,752,185 — 463,752,185 Net loans 417,589,558 — — 413,544,127 413,544,127 Financial liabilities Deposits $ 764,610,980 $ — $ 764,674,148 $ — $ 764,674,148 Federal Funds Purchased 12,500,000 12,500,000 — — 12,500,000 Federal Home Loan Bank advances 20,000,000 — 20,000,000 — 20,000,000 Securities Sold under Agreement to Repurchase 74,124,947 — 74,124,947 — 74,124,947 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 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, 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 June 30, 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 Inputs Range of Inputs Impaired loans $305,297 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 ($)	Jun. 30, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 59,126,558	$ 46,405,869
Letters of credit outstanding	$ 2,549,810	$ 2,842,010

Net Income per Share - Earnings

Net Income per Share - Earnings Per Share (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	4,889,772	4,878,986	4,886,258	4,874,565
Dilutive effect of granted options	5,020	11,064	7,729	18,777
Diluted weighted average shares outstanding	4,894,792	4,890,050	4,893,987	4,893,342
Net income	$ 1,688,140	$ 1,783,453	$ 3,460,527	$ 3,220,778
Net income per share-basic	$ 0.35	$ 0.37	$ 0.71	$ 0.66
Net income per share-diluted	$ 0.35	$ 0.36	$ 0.71	$ 0.66

Equity Compensation Plans - Sum

Equity Compensation Plans - Summary of Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 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	(6,000)
Expired | shares	(4,500)
Ending Balance | shares	52,500
Weighted Average Exercise Price
Beginning Balance | $ / shares	$ 20.96
Granted | $ / shares	0
Exercised | $ / shares	18
Expired | $ / shares	18
Ending Balance | $ / shares	$ 21.55

Equity Compensation Plans - Add

Equity Compensation Plans - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2018USD ($)shares
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 | shares	7,500
Restricted stock vesting period	1 year
Restricted stock grant date fair value	$ 165,375
Restricted stock cost	13,781
Restricted stock, deferred taxes	3,438
Directors Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding	141,570
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 ($)	6 Months Ended	12 Months Ended
	Jun. 30, 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 ($)	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 485,362,359	$ 516,006,296
Gross Unrealized Gains	84,772	1,101,494
Gross Unrealized Losses	21,694,946	12,061,413
Estimated Fair Value	463,752,185	505,046,377
Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99,566,635	180,647,580
Gross Unrealized Losses	4,269,911	4,199,022
Estimated Fair Value	95,296,724	176,448,558
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	278,584,218	213,707,125
Gross Unrealized Gains	6,438	43,197
Gross Unrealized Losses	12,561,575	5,327,265
Estimated Fair Value	266,029,081	208,423,057
State, County and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	107,211,506	118,786,297
Gross Unrealized Gains	78,334	849,364
Gross Unrealized Losses	4,863,460	2,535,126
Estimated Fair Value	$ 102,426,380	117,100,535
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,865,294
Gross Unrealized Gains		208,933
Estimated Fair Value		$ 3,074,227

Securities - Additional Informa

Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Jun. 30, 2018USD ($)
Mortgage-Backed Securities [Member]
Investment [Line Items]
Reclassification adjustment securities	$ 76,518,180

Securities - Amortized Cost a29

Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale, Amortized Cost
Due in one year or less	$ 1,817,972	$ 3,398,727
Due after one year through five years	97,858,493	75,887,288
Due after five years through ten years	31,088,580	55,691,854
Due after ten years	354,597,314	381,028,427
Amortized Cost	485,362,359	516,006,296
Available-for-sale, Estimated Fair Value
Due in one year or less	1,820,005	3,421,576
Due after one year through five years	94,124,451	74,589,829
Due after five years through ten years	29,855,611	54,740,055
Due after ten years	337,952,118	372,294,917
Total Fair Value	$ 463,752,185	$ 505,046,377

Securities - Summary of Unreali

Securities - Summary of Unrealized Loss Information for Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 134,490,145	$ 111,299,318
Less than 12 months Unrealized Losses	4,887,857	1,895,666
12 months or more Fair Value	316,802,471	344,493,101
12 months or more Unrealized Losses	16,807,089	10,165,747
Total Fair Value	451,292,616	455,792,419
Total Unrealized Losses	21,694,946	12,061,413
Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	15,119,779	15,681,866
Less than 12 months Unrealized Losses	647,021	223,534
12 months or more Fair Value	80,176,945	160,766,691
12 months or more Unrealized Losses	3,622,890	3,975,488
Total Fair Value	95,296,724	176,448,557
Total Unrealized Losses	4,269,911	4,199,022
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	93,958,426	88,499,852
Less than 12 months Unrealized Losses	3,434,432	1,613,091
12 months or more Fair Value	171,878,931	116,753,236
12 months or more Unrealized Losses	9,127,143	3,714,175
Total Fair Value	265,837,357	205,253,088
Total Unrealized Losses	12,561,575	5,327,266
State, County and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	25,411,940	7,117,600
Less than 12 months Unrealized Losses	806,404	59,041
12 months or more Fair Value	64,746,595	66,973,174
12 months or more Unrealized Losses	4,057,056	2,476,084
Total Fair Value	90,158,535	74,090,774
Total Unrealized Losses	$ 4,863,460	$ 2,535,125

Loans - Composition of Net Loan

Loans - Composition of Net Loans (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans	$ 420,722,000	$ 405,605,000
Unearned Income	(105,000)	(195,000)
Allowance for Loan Losses	(3,027,950)	(3,019,228)	$ (3,506,006)	$ (3,902,796)
Loans, net	417,589,558	402,390,574
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	338,591,000	330,489,000
Total Gross Loans	338,591,000	330,489,000
Allowance for Loan Losses	(2,616,899)	(2,151,715)	(2,747,926)	(3,117,134)
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	37,360,000	25,923,000
Total Gross Loans	37,360,000	25,923,000
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,889,000	16,905,000
Total Gross Loans	15,889,000	16,905,000
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	88,627,000	95,925,000
Total Gross Loans	88,627,000	95,925,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	196,715,000	191,736,000
Total Gross Loans	196,715,000	191,736,000
Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	67,381,000	59,126,000
Total Gross Loans	67,381,000	59,126,000
Allowance for Loan Losses	(118,028)	(346,781)	(283,048)	(257,554)
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	66,382,000	58,204,000
Total Gross Loans	66,382,000	58,204,000
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	999,000	922,000
Total Gross Loans	999,000	922,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	14,750,000	15,990,000
Total Gross Loans	14,750,000	15,990,000
Allowance for Loan Losses	(293,023)	(520,732)	$ (475,032)	$ (528,108)
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,342,000	1,310,000
Total Gross Loans	1,342,000	1,310,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,408,000	14,680,000
Total Gross Loans	$ 13,408,000	$ 14,680,000

Loans - Period-End Non-Accrual

Loans - Period-End Non-Accrual Loans, Segregated by Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	$ 7,083	$ 7,582
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	6,898	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	420
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	272	366
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	1,927	2,131
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	4,279	4,891
Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	114	110
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	31	32
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	83	78
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	71	84
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	$ 71	$ 84

Loans - Aging Analysis of Past

Loans - Aging Analysis of Past Due Loans, Segregated by Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	$ 5,428	$ 6,114
Total Past Due Loans	7,353	6,982
Current Loans	413,369	398,623
Total Gross Loans	420,722	405,605
Accruing Loans 90 or more Days Past Due	18	813
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	4,923	5,616
Total Past Due Loans	6,780	6,478
Current Loans	331,811	324,011
Total Gross Loans	338,591	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	16	281
Total Past Due Loans	436	281
Current Loans	36,924	25,642
Total Gross Loans	37,360	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	294	93
Total Past Due Loans	326	93
Current Loans	15,563	16,812
Total Gross Loans	15,889	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	1,978	2,657
Total Past Due Loans	2,233	2,657
Current Loans	86,394	93,268
Total Gross Loans	88,627	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	2,635	2,585
Total Past Due Loans	3,785	3,447
Current Loans	192,930	188,289
Total Gross Loans	196,715	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	154	51
Total Past Due Loans	154	51
Current Loans	67,227	59,075
Total Gross Loans	67,381	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	154	32
Total Past Due Loans	154	32
Current Loans	66,228	58,172
Total Gross Loans	66,382	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		19
Total Past Due Loans		19
Current Loans	999	903
Total Gross Loans	999	922
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	351	447
Total Past Due Loans	419	453
Current Loans	14,331	15,537
Total Gross Loans	14,750	15,990
Accruing Loans 90 or more Days Past Due	18	6
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	40	25
Total Past Due Loans	50	31
Current Loans	1,292	1,279
Total Gross Loans	1,342	1,310
Accruing Loans 90 or more Days Past Due	10	6
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	311	422
Total Past Due Loans	369	422
Current Loans	13,039	14,258
Total Gross Loans	13,408	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	1,925	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	1,857	862
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	420
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	32
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	255
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	1,150	862
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	68	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	$ 58

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($)	Jun. 30, 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 ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 7,610,000	$ 7,669,000
Recorded Investment With No Allowance	3,045,000	3,206,000
Recorded Investment With Allowance	4,565,000	4,463,000
Total Recorded Investment	7,609,500	7,668,908
Related Allowance	528,937	442,589
Average Recorded Investment	7,640,000	6,162,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	7,610,000	7,619,000
Recorded Investment With No Allowance	3,045,000	3,156,000
Recorded Investment With Allowance	4,565,000	4,463,000
Total Recorded Investment	7,610,000	7,619,000
Related Allowance	529,000	443,000
Average Recorded Investment	7,615,000	6,137,000
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	420,000	222,000
Recorded Investment With No Allowance		0
Recorded Investment With Allowance	420,000	222,000
Total Recorded Investment	420,000	222,000
Related Allowance	112,000
Average Recorded Investment	321,000	111,000
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	272,000	252,000
Recorded Investment With No Allowance	272,000	252,000
Total Recorded Investment	272,000	252,000
Average Recorded Investment	262,000	126,000
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,232,000	1,344,000
Recorded Investment With No Allowance	1,034,000	1,141,000
Recorded Investment With Allowance	198,000	203,000
Total Recorded Investment	1,232,000	1,344,000
Related Allowance	33,000	46,000
Average Recorded Investment	1,288,000	906,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5,686,000	5,801,000
Recorded Investment With No Allowance	1,739,000	1,763,000
Recorded Investment With Allowance	3,947,000	4,038,000
Total Recorded Investment	5,686,000	5,801,000
Related Allowance	384,000	397,000
Average Recorded Investment	5,744,000	4,994,000
Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		50,000
Recorded Investment With No Allowance		50,000
Total Recorded Investment		50,000
Average Recorded Investment	25,000	25,000
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		50,000
Recorded Investment With No Allowance		50,000
Total Recorded Investment		50,000
Average Recorded Investment	$ 25,000	$ 25,000

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructurings Segregated by Class (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)Loan	Dec. 31, 2017USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	3
Post-Modification Outstanding Recorded Investment	$ 2,998	$ 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	$ 2,998	$ 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	$ 2,998	$ 3,047

Loans - Changes in Troubled Deb

Loans - Changes in Troubled Debt Restructurings (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)Loan	Dec. 31, 2017USD ($)Loan
Receivables [Abstract]
Number of Loans | Loan	3	3
Principal paydowns, Recorded Investment	$ (49)
Post-Modification Outstanding Recorded Investment	$ 2,998	$ 3,047

Loans - Detailed Amount of Gros

Loans - Detailed Amount of Gross Loans Segregated by Loan Grade and Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 420,722	$ 405,605
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	338,591	330,489
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	37,360	25,923
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	15,889	16,905
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	88,627	95,925
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	196,715	191,736
Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	67,381	59,126
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	66,382	58,204
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	999	922
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	14,750	15,990
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,342	1,310
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	13,408	14,680
Satisfactory 1, 2, 3, 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	365,028	336,366
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	286,291	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	35,479	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	14,488	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	78,362	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	157,962	143,271
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	64,238	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	63,280	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	958	853
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	14,499	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	1,332	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	13,167	14,414
Special Mention 5,6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	33,398	53,011
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	32,314	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	881	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	367	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	2,482	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	28,584	41,833
Special Mention 5,6 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,000	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	995	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	5	9
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	84	71
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	84	71
Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	22,238	16,170
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	19,986	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	1,034	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	7,783	8,083
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	10,169	6,632
Substandard 7 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,143	193
Substandard 7 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,107	133
Substandard 7 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	36	60
Substandard 7 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	109	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	99	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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			$ 3,019,228	$ 3,902,796
(Reversal of) provision for loan losses	$ 88,962	$ (29,586)	(147,811)	(180,806)
Chargeoffs			173,346	266,900
Recoveries			329,879	50,916
Net chargeoffs (recoveries)			(156,533)	215,984
Ending Balance	3,027,950	3,506,006	3,027,950	3,506,006
Loans individually evaluated for impairment					$ 528,937	$ 547,621
Loans collectively evaluated for impairment					2,499,013	2,958,385
Ending Balance	3,027,950	3,506,006	3,027,950	3,506,006	3,027,950	3,506,006
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			481,714	(271,448)
Chargeoffs			98,644	117,157
Recoveries			82,114	19,397
Net chargeoffs (recoveries)			16,530	97,760
Ending Balance	2,616,899	2,747,926	2,616,899	2,747,926
Loans individually evaluated for impairment					528,937	547,621
Loans collectively evaluated for impairment					2,087,962	2,200,305
Ending Balance	2,616,899	2,747,926	2,616,899	2,747,926	2,616,899	2,747,926
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			346,781	257,554
(Reversal of) provision for loan losses			(410,727)	153,428
Chargeoffs			15,347	128,207
Recoveries			197,321	273
Net chargeoffs (recoveries)			(181,974)	127,934
Ending Balance	118,028	283,048	118,028	283,048
Loans collectively evaluated for impairment					118,028	283,048
Ending Balance	118,028	283,048	118,028	283,048	118,028	283,048
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			520,732	528,108
(Reversal of) provision for loan losses			(218,798)	(62,786)
Chargeoffs			59,355	21,536
Recoveries			50,444	31,246
Net chargeoffs (recoveries)			8,911	(9,710)
Ending Balance	293,023	475,032	293,023	475,032
Loans collectively evaluated for impairment					293,023	475,032
Ending Balance	$ 293,023	$ 475,032	$ 293,023	$ 475,032	$ 293,023	$ 475,032

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	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment	$ 7,610	$ 4,396
Loans collectively evaluated for general impairment	413,112	401,209
Total Gross Loans	420,722	405,605
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment	7,610	4,396
Loans collectively evaluated for general impairment	330,981	326,093
Total Gross Loans	338,591	330,489
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans collectively evaluated for general impairment	67,381	59,126
Total Gross Loans	67,381	59,126
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans collectively evaluated for general impairment	14,750	15,990
Total Gross Loans	$ 14,750	$ 15,990

Fair Value of Financial Instr41

Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 463,752,185	$ 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	95,296,724	176,448,558
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	266,029,081	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	102,426,380	117,100,535
Other Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		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	463,752,185	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		3,074,227
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	463,752,185	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	95,296,724	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	266,029,081	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	102,426,380	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		3,074,227
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	463,752,185	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	95,296,724	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	266,029,081	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	$ 102,426,380	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		3,074,227
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		$ 3,074,227

Fair Value of Financial Instr42

Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Beginning Balance	$ 3,074,227	$ 2,971,106
Sales	(2,865,294)
Principal payments received		(5,067)
Unrealized (loss) gains included in other comprehensive income	$ (208,933)	39,303
Ending Balance		$ 3,005,342

Fair Value of Financial Instr43

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 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	7,609,500	7,668,908
Impaired loans, allowance for loan losses	528,937	442,589
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 Instr44

Fair Value of Financial Instruments - Asset Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Jun. 30, 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	$ 305,297	$ 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	305,297	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	305,297	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	$ 305,297	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 ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 305,297	$ 1,851,752
Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 305,297	$ 544,502
Valuation Technique	Appraised value of collateral less estimated costs to sell
Measurement Input, Loss Severity [Member] | Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
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 ($)	Jun. 30, 2018	Dec. 31, 2017
Financial assets
Cash and due from banks	$ 12,641,231	$ 17,962,990
Interest bearing deposits with banks	1,293,179	1,532,420
Securities available-for-sale	463,752,185	505,046,377
Net loans	413,544,127	401,706,081
Financial liabilities
Deposits	764,674,148	720,821,564
Federal Funds Purchase	12,500,000	1,500,000
Federal Home Loan Bank advances	20,000,000	30,005,541
Securities Sold under Agreement to Repurchase	74,124,947	142,497,938
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Cash and due from banks	12,641,231	17,962,990
Interest bearing deposits with banks	1,293,179	1,532,420
Financial liabilities
Deposits		543,123,284
Federal Funds Purchase	12,500,000
Securities Sold under Agreement to Repurchase		142,497,938
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Securities available-for-sale	463,752,185	501,972,150
Financial liabilities
Deposits	764,674,148
Federal Home Loan Bank advances	20,000,000
Securities Sold under Agreement to Repurchase	74,124,947
Significant Unobservable Inputs (Level 3) [Member]
Financial assets
Securities available-for-sale		3,074,227
Net loans	413,544,127	401,706,081
Financial liabilities
Deposits		177,698,280
Federal Home Loan Bank advances		30,005,541
Carrying Value [Member]
Financial assets
Cash and due from banks	12,641,231	17,962,990
Interest bearing deposits with banks	1,293,179	1,532,420
Securities available-for-sale	463,752,185	505,046,377
Net loans	417,589,558	402,390,574
Financial liabilities
Deposits	764,610,980	720,685,499
Federal Funds Purchase	12,500,000
Federal Home Loan Bank advances	20,000,000	30,000,000
Securities Sold under Agreement to Repurchase	$ 74,124,947	$ 142,497,938