Citizens Holding (CIZN) 10-Q 9 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 06, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	CIZN
Entity Registrant Name	CITIZENS HOLDING CO /MS/
Entity Central Index Key	1,075,706
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		4,894,705

Consolidated Statements of Cond

Consolidated Statements of Condition - USD ($)	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 20,791,594	$ 21,688,557
Interest bearing deposits with other banks	29,640,509	48,603,182
Investment securities available for sale, at fair value	518,236,091	496,124,574
Loans, net of allowance for loan losses of $3,403,933 in 2017 and $3,902,796 in 2016	389,674,425	390,148,343
Premises and equipment, net	20,752,738	18,664,084
Other real estate owned, net	4,174,291	4,443,010
Accrued interest receivable	4,052,086	4,720,189
Cash surrender value of life insurance	24,338,620	23,890,333
Deferred tax assets, net	7,382,774	10,634,669
Other assets	7,081,369	6,294,966
TOTAL ASSETS	1,026,124,497	1,025,211,907
Deposits:
Noninterest-bearing demand	152,450,812	149,512,941
Interest-bearing NOW and money market accounts	338,083,326	340,180,286
Savings deposits	76,628,605	73,745,005
Certificates of deposit	187,605,623	196,714,108
Total deposits	754,768,366	760,152,340
Securities sold under agreement to repurchase	149,451,950	150,282,913
Federal Home Loan Bank advances	20,000,000	20,000,000
Accrued interest payable	176,973	199,368
Deferred compensation payable	8,513,978	8,209,427
Other liabilities	1,270,799	1,308,464
Total liabilities	934,182,066	940,152,512
SHAREHOLDERS' EQUITY
Common stock; $0.20 par value, 22,500,000 shares authorized, 4,894,705 shares issued and outstanding at September 30, 2017 and 4,882,579 shares issued and outstanding at December 31, 2016	978,941	976,516
Additional paid-in capital	4,058,083	3,802,204
Retained earnings	92,305,609	90,999,689
Accumulated other comprehensive loss, net of tax benefit of $3,212,560 in 2017 and $6,376,702 in 2016	(5,400,202)	(10,719,014)
Total shareholders' equity	91,942,431	85,059,395
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,026,124,497	$ 1,025,211,907

Consolidated Statements of Con3

Consolidated Statements of Condition (Parenthetical) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Loans, allowance for loan losses	$ 3,403,933	$ 3,902,796
Common stock, par value	$ 0.20	$ 0.20
Common stock, shares authorized	22,500,000	22,500,000
Common stock, shares issued	4,894,705	4,882,579
Common stock, shares outstanding	4,894,705	4,882,579
Accumulated other comprehensive loss, tax benefits	$ (3,212,560)	$ (6,376,702)

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
INTEREST INCOME
Loans, including fees	$ 4,585,668	$ 4,825,800	$ 14,017,718	$ 14,344,314
Investment securities	2,892,063	2,719,014	8,643,750	8,286,600
Other interest	66,633	28,813	194,266	147,781
Total interest income	7,544,364	7,573,627	22,855,734	22,778,695
INTEREST EXPENSE
Deposits	471,049	447,554	1,434,694	1,366,412
Other borrowed funds	353,968	305,934	1,027,587	911,213
Total interest expense	825,017	753,488	2,462,281	2,277,625
NET INTEREST INCOME	6,719,347	6,820,139	20,393,453	20,501,070
(Reversal of) provision for loan losses	(73,808)	184,018	(254,614)	97,468
NET INTEREST INCOME AFTER (REVERSAL OF) PROVISION FOR LOAN LOSSES	6,793,155	6,636,121	20,648,067	20,403,602
OTHER INCOME
Service charges on deposit accounts	1,115,474	1,009,486	3,176,877	2,794,790
Other service charges and fees	702,686	658,644	1,992,929	1,852,141
Other operating income	308,012	411,528	1,013,818	1,156,554
Total other income	2,126,172	2,079,658	6,183,624	5,803,485
OTHER EXPENSES
Salaries and employee benefits	3,744,831	3,460,948	11,154,068	10,341,493
Occupancy expense	1,335,676	1,329,796	3,984,549	3,867,043
Other operating expense	1,806,713	1,766,669	5,768,370	5,648,661
Total other expenses	6,887,220	6,557,413	20,906,987	19,857,197
INCOME BEFORE PROVISION FOR INCOME TAXES	2,032,107	2,158,366	5,924,704	6,349,890
PROVISION FOR INCOME TAXES	424,638	406,076	1,096,457	1,292,427
NET INCOME	$ 1,607,469	$ 1,752,290	$ 4,828,247	$ 5,057,463
NET INCOME PER SHARE -Basic	$ 0.33	$ 0.36	$ 0.99	$ 1.04
NET INCOME PER SHARE -Diluted	0.33	0.36	0.99	1.04
DIVIDENDS PAID PER SHARE	$ 0.24	$ 0.24	$ 0.72	$ 0.72

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,607,469	$ 1,752,290	$ 4,828,247	$ 5,057,463
Securities available-for-sale
Unrealized holding gains	(2,137,839)	(556,424)	8,378,246	2,882,502
Income tax effect	797,413	207,546	(3,125,086)	(1,075,174)
Net unrealized gains	(1,340,426)	(348,878)	5,253,160	1,807,328
Securities transferred from available-for-sale to held-to-maturity
Amortization of net unrealized losses during the period		6,183,648		11,305,439
Income tax effect		(2,306,501)		(4,216,929)
Net unrealized (losses) gains, securities held-to-maturity		3,877,147		7,088,510
Reclassification adjustment for gains included in net income	15,612	60,053	104,708	97,191
Income tax effect	(5,823)	(22,400)	(39,056)	(36,252)
Net gains included in net income	9,789	37,653	65,652	60,939
Total other comprehensive (loss) income	(1,330,637)	3,565,922	5,318,812	8,956,777
Comprehensive income	$ 276,832	$ 5,318,212	$ 10,147,059	$ 14,014,240

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net cash provided by operating activities	$ 8,034,077	$ 18,157,449
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from maturities and calls of securities available for sale	31,045,728	112,497,410
Proceeds from maturities and calls of securities held to maturity		161,829,797
Proceeds from sale of investment securities	114,060,844	764,023
Purchases of investment securities available for sale	(160,967,616)	(301,273,861)
Purchases of bank premises and equipment	(2,844,102)	(335,501)
Increase (decrease) in interest bearing deposits with other banks	18,962,673	(36,901,945)
Purchase of Federal Home Loan Bank Stock	(498,700)	(3,600)
Proceeds from sale of other real estate	127,722	790,032
Net decrease in loans	829,450	14,956,106
Net cash provided by (used by) investing activities	715,999	(47,677,539)
CASH FLOWS FROM FINANCING ACTIVITIES
Net (decrease) increase in deposits	(5,386,374)	27,058,666
Net change in securities sold under agreement to repurchase	(830,963)	13,755,873
Proceeds from exercise of stock options	92,625
Payment of dividends	(3,522,327)	(3,514,296)
Net cash (used by) provided by financing activities	(9,647,039)	37,300,243
Net (decrease) increase in cash and due from banks	(896,963)	7,780,153
Cash and due from banks, beginning of period	21,688,557	14,947,690
Cash and due from banks, end of period	$ 20,791,594	$ 22,727,843

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Note 1. 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 September 30, 2017 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

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017, the Corporation had entered into loan commitments with certain customers with an aggregate unused balance of $38,122,030 compared to an aggregate unused balance of $37,194,220 at December 31, 2016. There were $2,713,880 of letters of credit outstanding at September 30, 2017 and $3,456,180 at December 31, 2016. 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	9 Months Ended
	Sep. 30, 2017
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 using the treasury stock method. Net income per share was computed as follows: For the Three Months For the Nine Months Ended September 30, Ended September 30, 2017 2016 2017 2016 Basic weighted average shares outstanding 4,882,705 4,869,079 4,877,338 4,864,924 Dilutive effect of granted options 10,443 8,614 17,412 8,316 Diluted weighted average shares outstanding 4,893,148 4,877,693 4,894,750 4,873,240 Net income $ 1,607,469 $ 1,752,290 $ 4,828,247 $ 5,057,463 Net income per share-basic $ 0.33 $ 0.36 $ 0.99 $ 1.04 Net income per share-diluted $ 0.33 $ 0.36 $ 0.99 $ 1.04

Equity Compensation Plans

Equity Compensation Plans	9 Months Ended
	Sep. 30, 2017
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 nine months ended September 30, 2017. Directors’ Plan 2013 Plan Weighted Weighted Number Average Number Average of Exercise of Exercise Shares Price Shares Price Outstanding at December 31, 2016 78,000 $ 21.08 — $ — Granted — — — — Exercised (6,000 ) 20.94 — — Expired (9,000 ) 22.00 — — Outstanding at September 30, 2017 63,000 $ 20.96 — $ — The intrinsic value of options previously granted under the Directors’ Plan at September 30, 2017, was $258,885 and since there were no options granted under the 2013 Plan during the three-month period ended September 30, 2017, the intrinsic value for the 2013 Plan at September 30, 2017 is $0, for an aggregate intrinsic value at September 30, 2017 of $258,885. During the quarter ended September 30, 2017, the Corporation’s directors received restricted stock grants totaling 7,500 shares of common stock under the 2013 Plan. These grants vest over a one-year one-year

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 5. Income Taxes The Corporation files a consolidated United States federal income tax return. The Corporation is currently open to audit under the statute of limitations by the Internal Revenue Service for all tax years after 2013. The Corporation’s consolidated state income tax returns are also open to audit under the statute of limitations for the same period.

Securities

Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	Note 6. Securities The amortized cost and estimated fair value of securities available-for-sale Gross Gross September 30, 2017 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 183,095,272 $ — $ 3,090,044 $ 180,005,228 Mortgage backed securities 223,005,218 85,489 3,812,513 219,278,194 State, County, Municipals 117,883,069 1,003,224 2,972,681 115,913,612 Other investments 2,865,294 173,763 — 3,039,057 Total $ 526,848,853 $ 1,262,476 $ 9,875,238 $ 518,236,091 Gross Gross December 31, 2016 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 207,080,794 $ — $ 7,114,186 $ 199,966,608 Mortgage backed securities 152,765,924 340,419 4,841,633 148,264,710 State, County, Municipals 150,503,811 1,269,356 6,851,017 144,922,150 Other investments 2,869,761 101,345 — 2,971,106 Total $ 513,220,290 $ 1,711,120 $ 18,806,836 $ 496,124,574 The amortized cost and estimated fair value of securities by contractual maturity at September 30, 2017 and December 31, 2016 are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay certain obligations. September 30, 2017 December 31, 2016 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Available-for-sale Due in one year or less $ 3,294,221 $ 3,331,064 $ 6,333,181 $ 6,370,921 Due after one year through five years 64,109,627 63,563,038 30,059,503 30,278,557 Due after five years through ten years 65,862,472 65,246,785 126,336,589 122,562,724 Due after ten years 393,582,533 386,095,204 350,491,017 336,912,372 Total $ 526,848,853 $ 518,236,091 $ 513,220,290 $ 496,124,574 The tables below show the Corporation’s gross unrealized losses and fair value of available-for-sale held-to-maturity A summary of unrealized loss information for securities available-for-sale, September 30, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 161,875 $ 2,654 $ 18,130 $ 436 $ 180,005 $ 3,090 Mortgage backed securities 163,292 2,548 47,507 1,264 210,799 3,812 State, County, Municipal 11,017 215 58,098 2,758 69,115 2,973 Total $ 336,184 $ 5,417 $ 123,735 $ 4,458 $ 459,919 $ 9,875 December 31, 2016 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 195,363 $ 6,753 $ 4,604 $ 362 $ 199,967 $ 7,115 Mortgage backed securities 117,438 4,183 24,353 658 141,791 4,841 State, County, Municipal 95,088 6,663 3,092 188 98,180 6,851 Total $ 407,889 $ 17,599 $ 32,049 $ 1,208 $ 439,938 $ 18,807 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	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans	Note 7. Loans The composition of net loans (in thousands) at September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 Real Estate: Land Development and Construction $ 22,342 $ 23,793 Farmland 18,036 18,175 1-4 97,431 97,812 Commercial Real Estate 183,613 180,880 Total Real Estate Loans 321,422 320,660 Business Loans: Commercial and Industrial Loans 54,154 53,761 Farm Production and Other Farm Loans 1,069 765 Total Business Loans 55,223 54,526 Consumer Loans: Credit Cards 1,202 1,156 Other Consumer Loans 15,495 18,310 Total Consumer Loans 16,697 19,466 Total Gross Loans 393,342 394,652 Unearned Income (264 ) (601 ) Allowance for Loan Losses (3,404 ) (3,903 ) Loans, net $ 389,674 $ 390,148 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 September 30, 2017 December 31, 2016 Real Estate: Land Development and Construction $ 42 $ 133 Farmland 382 234 1-4 2,169 1,954 Commercial Real Estate 5,066 6,293 Total Real Estate Loans 7,659 8,614 Business Loans: Commercial and Industrial Loans 82 239 Total Business Loans 82 239 Consumer Loans: Other Consumer Loans 92 26 Total Consumer Loans 92 26 Total Nonaccrual Loans $ 7,833 $ 8,879 An aging analysis of past due loans (in thousands), segregated by class, as of September 30, 2017, was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 54 $ — $ 54 $ 22,288 $ 22,342 $ — Farmland 183 31 214 17,822 18,036 — 1-4 3,338 233 3,571 93,860 97,431 — Commercial Real Estate 2,032 155 2,187 181,426 183,613 — Total Real Estate Loans 5,607 419 6,026 315,396 321,422 — Business Loans: Commercial and Industrial Loans 254 247 501 53,653 54,154 247 Farm Production and Other Farm Loans 53 — 53 1,016 1,069 — Total Business Loans 307 247 554 54,669 55,223 247 Consumer Loans: Credit Cards 8 1 9 1,193 1,202 1 Other Consumer Loans 588 70 658 14,837 15,495 51 Total Consumer Loans 596 71 667 16,030 16,697 52 Total Loans $ 6,510 $ 737 $ 7,247 $ 386,095 $ 393,342 $ 299 An aging analysis of past due loans (in thousands), segregated by class, as of December 31, 2016 was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 208 $ 78 $ 286 $ 23,507 $ 23,793 $ — Farmland 584 65 649 17,526 18,175 — 1-4 2,993 596 3,589 94,223 97,812 179 Commercial Real Estate 903 185 1,088 179,792 180,880 — Total Real Estate Loans 4,688 924 5,612 315,048 320,660 179 Business Loans: Commercial and Industrial Loans 66 186 252 53,509 53,761 — Farm Production and Other Farm Loans — — — 765 765 — Total Business Loans 66 186 252 54,274 54,526 — Consumer Loans: Credit Cards 7 3 10 1,146 1,156 3 Other Consumer Loans 788 27 815 17,495 18,310 27 Total Consumer Loans 795 30 825 18,641 19,466 30 Total Loans $ 5,549 $ 1,140 $ 6,689 $ 387,963 $ 394,652 $ 209 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 September 30, 2017, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Allowance Real Estate: 1-4 $ 468 $ — $ 468 $ 468 $ 136 $ 167 Commercial Real Estate 4,186 — 4,186 4,186 402 417 Total Real Estate Loans 4,654 — 4,654 4,654 538 584 Business Loans: Commercial and Industrial Loans — — — — — 15 Total Business Loans — — — — — 15 Total Loans $ 4,654 $ — $ 4,654 $ 4,654 $ 538 $ 599 Impaired loans (in thousands) as of December 31, 2016, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Allowance Real Estate: Land Development and Construction $ — $ — $ — $ — $ — $ 43 Farmland 163 — 163 163 28 87 1-4 1,448 — 1,448 1,448 252 218 Commercial Real Estate 5,327 — 5,327 5,327 469 1,577 Total Real Estate Loans 6,938 — 6,938 6,938 749 1,925 Business Loans: Commercial and Industrial Loans 126 — 126 126 38 19 Total Business Loans 126 — 126 126 38 19 Total Loans $ 7,064 $ — $ 7,064 $ 7,064 $ 787 $ 1,944 The following table presents troubled debt restructurings (in thousands, except for number of loans), segregated by class: Pre-Modification Post-Modification September 30, 2017 Outstanding Outstanding Number of Recorded Recorded Loans Investment Investment Commercial real estate 3 $ 4,871 $ 3,160 Total 3 $ 4,871 $ 3,160 Pre-Modification Post-Modification December 31, 2016 Outstanding Outstanding Number of Recorded Recorded Loans Investment Investment Commercial real estate 3 $ 4,871 $ 3,288 Total 3 $ 4,871 $ 3,288 Changes in the Corporation’s troubled debt restructurings (in thousands, except for number of loans) are set forth in the table below: Number Recorded of Loans Investment Totals at January 1, 2017 3 $ 3,288 Reductions due to: Principal paydowns (128 ) Total at September 30, 2017 3 $ 3,160 The allocated allowance for loan losses attributable to restructured loans was $174,274 at September 30, 2017 and December 31, 2016. The Corporation had no remaining availability under commitments to lend additional funds on these troubled debt restructurings as of September 30, 2017. 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 September 30, 2017. The following table details the amount of gross loans (in thousands), segregated by loan grade and class, as of September 30, 2017: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 21,375 $ 835 $ 132 $ — $ — $ 22,342 Farmland 16,599 641 796 — — 18,036 1-4 83,316 5,454 8,661 — — 97,431 Commercial Real Estate 154,274 22,259 7,080 — — 183,613 Total Real Estate Loans 275,564 29,189 16,669 — — 321,422 Business Loans: Commercial and Industrial Loans 50,747 3,018 389 — — 54,154 Farm Production and Other Farm Loans 986 12 71 — — 1,069 Total Business Loans 51,733 3,030 460 — — 55,223 Consumer Loans: Credit Cards 1,201 — 1 — — 1,202 Other Consumer Loans 15,158 73 264 — — 15,495 Total Consumer Loans 16,359 73 265 — — 16,697 Total Loans $ 343,656 $ 32,292 $ 17,394 $ — $ — $ 393,342 The following table details the amount of gross loans (in thousands) segregated by loan grade and class, as of December 31, 2016: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 23,038 $ 186 $ 569 $ — $ — $ 23,793 Farmland 16,448 776 951 — — 18,175 1-4 86,043 1,754 10,015 — — 97,812 Commercial Real Estate 161,323 11,072 8,485 — — 180,880 Total Real Estate Loans 286,852 13,788 20,020 — — 320,660 Business Loans: Commercial and Industrial Loans 51,985 1,427 349 — — 53,761 Farm Production and Other Farm Loans 727 28 10 — — 765 Total Business Loans 52,712 1,455 359 — — 54,526 Consumer Loans: Credit Cards 1,153 — 3 — — 1,156 Other Consumer Loans 18,027 149 132 2 — 18,310 Total Consumer Loans 19,180 149 135 2 — 19,466 Total Loans $ 358,744 $ 15,392 $ 20,514 $ 2 $ — $ 394,652 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 nine months ended September 30, 2017: Real Business September 30, 2017 Estate Loans Consumer Total Beginning Balance, January 1, 2017 $ 3,117,134 $ 257,554 $ 528,108 $ 3,902,796 (Reversal of) provision for loan losses (482,980 ) 199,355 29,011 (254,614 ) Chargeoffs 126,757 146,139 41,788 314,684 Recoveries 26,188 754 43,493 70,435 Net chargeoffs (recoveries) 100,569 145,385 (1,705 ) 244,249 Ending Balance $ 2,533,585 $ 311,524 $ 558,824 $ 3,403,933 Period end allowance allocated to: Loans individually evaluated for impairment $ 537,897 $ — $ — $ 537,897 Loans collectively evaluated for impairment 1,995,688 311,524 558,824 2,866,036 Ending Balance, September 30, 2017 $ 2,533,585 $ 311,524 $ 558,824 $ 3,403,933 The following table details activity in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2016: Real Business September 30, 2016 Estate Loans Consumer Total Beginning Balance, January 1, 2016 $ 5,238,895 $ 643,248 $ 591,560 $ 6,473,703 (Reversal of) provision for loan losses 214,491 (93,733 ) (23,290 ) 97,468 Chargeoffs 2,508,459 5,428 49,317 2,563,204 Recoveries 32,424 14,381 58,670 105,475 Net chargeoffs (recoveries) 2,476,035 (8,953 ) (9,353 ) 2,457,729 Ending Balance $ 2,977,351 $ 558,468 $ 577,623 $ 4,113,442 Period end allowance allocated to: Loans individually evaluated for impairment $ 848,091 $ — $ — $ 848,091 Loans collectively evaluated for impairment 2,129,260 558,468 577,623 3,265,351 Ending Balance, September 30, 2016 $ 2,977,351 $ 558,468 $ 577,623 $ 4,113,442 The Corporation’s recorded investment in loans as of September 30, 2017 and December 31, 2016 related to each balance in the allowance for possible loan losses by portfolio segment and disaggregated on the basis of the Corporation’s impairment methodology was as follows (in thousands): Real Business September 30, 2017 Estate Loans Consumer Total Loans individually evaluated for specific impairment $ 4,654 $ — $ — $ 4,654 Loans collectively evaluated for general impairment 316,768 55,223 16,697 388,688 $ 321,422 $ 55,223 $ 16,697 $ 393,342 Real Business December 31, 2016 Estate Loans Consumer Total Loans individually evaluated for specific impairment $ 6,938 $ 126 $ — $ 7,064 Loans collectively evaluated for general impairment 313,722 54,400 19,466 387,588 $ 320,660 $ 54,526 $ 19,466 $ 394,652

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 180,005,228 $ — $ 180,005,228 Mortgage-backed securities — 219,278,194 — 219,278,194 State, county and municipal obligations — 115,913,612 — 115,913,612 Other investments — — 3,039,057 3,039,057 Total $ — $ 515,197,034 $ 3,039,057 $ 518,236,091 The following table presents assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2016: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 199,966,608 $ — $ 199,966,608 Mortgage-backed securities — 148,264,710 — 148,264,710 State, county and municipal obligations — 144,922,150 — 144,922,150 Other investments — — 2,971,106 2,971,106 Total $ — $ 493,153,468 $ 2,971,106 $ 496,124,574 The following table reports the activity in assets measured at fair value on a recurring basis using significant unobservable inputs: Fair Value Measurements Using: Significant Unobservable Inputs (Level 3) Structured Financial Product As of September 30, 2017 2016 Beginning Balance $ 2,971,106 $ 2,915,709 Principal payments received (5,067 ) (46,326 ) Unrealized gains included in other comprehensive income 73,018 71,576 Ending Balance $ 3,039,057 $ 2,940,959 The Corporation recorded no gains or losses in earnings for the period ended September 30, 2017 or December 31, 2016 that were attributable to the change in unrealized gains or losses relating to assets still held at the reporting date. The following table presents information as of September 30, 2017 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis: Financial instrument Fair Value Valuation Technique Significant Range of Inputs Trust preferred securities $ 3,039,057 Discounted cash flows Default rate 0-100% For assets measured at fair value on a nonrecurring basis during 2017 that were still held on the Corporation’s balance sheet at September 30, 2017, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 539,865 $ 539,865 Total $ — $ — $ 539,865 $ 539,865 The following table presents information as of September 30, 2017 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation Technique Significant Unobservable Range of Impaired loans $ 539,865 Appraised value of collateral less Estimated costs to sell 25% For assets measured at fair value on a nonrecurring basis during 2016 that were still held on the Corporation’s balance sheet at December 31, 2016, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 3,591,516 $ 3,591,516 Other real estate owned — — 1,893,949 1,893,949 Total $ — $ — $ 5,485,465 $ 5,485,465 Impaired loans with a carrying value of $4,654,471 and $7,064,185 had an allocated allowance for loan losses of $537,897 and $786,893 at September 30, 2017 and December 31, 2016, 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 nine-month period ended September 30, 2017, and recorded at fair value, less costs to sell, was $11,200, of which $11,200 was sold during this period. There were no writedowns during the period on properties owned. OREO acquired during 2016 and recorded at fair value, less costs to sell, was $2,187,125. There were $220,419 in additional writedowns during 2016 on OREO acquired in previous years. The financial instruments topic of the ASC requires disclosure of financial instruments’ fair values, as well as the methodology and significant assumptions used in estimating fair values. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instrument. The financial instruments topic of the ASC excludes certain financial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Corporation and may not be indicative of amounts that might ultimately be realized upon disposition or settlement of those assets and liabilities. The following represents the carrying value and estimated fair value of the Corporation’s financial instruments at September 30, 2017: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Total Carrying Identical Observable Unobservable Fair September 30, 2017 Value Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 20,791,594 $ 20,791,594 $ — $ — $ 20,791,594 Interest bearing deposits with banks 29,640,509 29,640,509 — — 29,640,509 Securities available-for-sale 518,236,091 — 515,197,034 3,039,057 518,236,091 Net loans 389,674,425 — — 390,351,005 390,351,005 Financial liabilities Deposits $ 754,768,366 $ 567,162,743 $ — $ 187,740,115 $ 754,902,858 Federal Home Loan Bank advances 20,000,000 — — 20,130,400 20,130,400 Securities Sold under Agreement to Repurchase 149,451,950 149,451,950 — — 149,451,950 The following represents the carrying value and estimated fair value of the Corporation’s financial instruments at December 31, 2016: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Total Carrying Identical Observable Unobservable Fair December 31, 2016 Value Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 21,688,557 $ 21,688,557 $ — $ — $ 21,688,557 Interest bearing deposits with banks 48,603,182 48,603,182 — — 48,603,182 Securities available-for-sale 496,124,574 — 493,153,468 2,971,106 496,124,574 Net loans 390,148,343 — — 391,106,337 391,106,337 Financial liabilities Deposits $ 760,152,340 $ 563,440,632 $ — $ 196,859,851 $ 760,300,483 Federal Home Loan Bank advances 20,000,000 — — 20,283,999 20,283,999 Securities Sold under Agreement to Repurchase 150,282,913 150,282,913 — — 150,282,913 The fair value estimates, methods and assumptions used by the Corporation in estimating its fair value disclosures for financial statements were as follows: Cash and Due from Banks and Interest Bearing Deposits with Banks The carrying amounts reported in the balance sheet for these instruments approximate fair value because of their immediate and shorter-term maturities, which are considered to be three months or less when purchased. Securities Available-for-Sale Fair values for investment securities are based on quoted market prices, when available (Level 1). If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments (Level 2). When neither quoted prices nor comparable instruments are available, unobservable inputs are needed to form an expected future cash flow analysis to establish fair values (Level 3). The Corporation owns certain beneficial interests in one collateralized debt obligation secured by community bank trust preferred securities. These interests do not trade in a liquid market, and therefore, market quotes are not a reliable indicator of their ultimate realizability. The Corporation utilizes a discounted cash flow model using inputs of (1) market yields of trust-preferred securities as the discount rate and (2) expected cash flows which are estimated using assumptions related to defaults, deferrals and prepayments to determine the fair values of these beneficial interests. Many of the factors that adjust the timing and extent of cash flows are based on judgment and not directly observable in the markets. Therefore, these fair values are classified as Level 3 valuations for accounting and disclosure purposes. Since observable transactions in these securities are rare, the Corporation uses assumptions that a market participant would use in valuing these instruments. These assumptions primarily include cash flow estimates and market discount rates. The cash flow estimates are sensitive to the assumptions related to the ability of the issuers to pay the underlying trust preferred securities according to their terms. The market discount rates depend on transactions, which are rare given the lack of interest of investors in these types of beneficial interests. Net Loans For variable-rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. The fair values for other loans, including impaired loans, (i.e., commercial real estate and rental property mortgage loans, commercial and industrial loans, financial institution loans, and agricultural loans) are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Deposits The fair values for demand deposits, NOW and money market accounts and savings accounts are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). The carrying amounts for variable-rate, fixed-term money market accounts and time deposits approximate their fair values at the reporting date. Fair values for fixed-rate time deposits are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits. Federal Home Loan Bank (“FHLB”) Borrowings The fair value of FHLB advances is based on a discounted cash flow analysis. Securities Sold Under Agreement to Repurchase Due to the short term nature of these instruments, which is generally three months or less, the carrying amount is equal to the fair value. Off-Balance The fair value of commitments to extend credit and letters of credit are estimated using fees currently charged to enter into similar agreements. The fees associated with these financial instruments are not material.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Note 9. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU 2014-09, “Revenue from Contracts with Customers” 2014-09”). 2014-09 2015-14, 2014-09 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 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 February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02”). ASU 2016-02 on-balance right-of-use lease’s classification, which may significantly increase reported assets and liabilities. The accounting model and disclosure requirements for lessors remains substantially unchanged from current GAAP. ASU 2016-02 2016-02 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 March 2017, the FASB issued ASU No. 2017-08, Receivables- Nonrefundable Fees and Other Costs (Subtopic 310-20) 2017-08”). ASU 2017-08 2017-08 2017-08 In May 2017, the FASB issued ASU 2017-09, “Compensation—Stock Compensation (Subtopic 718): Scope of Modification Accounting” 2017-09”). 2017-09 2017-09 2017-09

Recent Accounting Pronounceme16

Recent Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU 2014-09, “Revenue from Contracts with Customers” 2014-09”). 2014-09 2015-14, 2014-09 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 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 February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 2016-02”). ASU 2016-02 on-balance right-of-use lease’s classification, which may significantly increase reported assets and liabilities. The accounting model and disclosure requirements for lessors remains substantially unchanged from current GAAP. ASU 2016-02 2016-02 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 March 2017, the FASB issued ASU No. 2017-08, Receivables- Nonrefundable Fees and Other Costs (Subtopic 310-20) 2017-08”). ASU 2017-08 2017-08 2017-08 In May 2017, the FASB issued ASU 2017-09, “Compensation—Stock Compensation (Subtopic 718): Scope of Modification Accounting” 2017-09”). 2017-09 2017-09 2017-09

Net Income per Share (Tables)

Net Income per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Net income per share was computed as follows: For the Three Months For the Nine Months Ended September 30, Ended September 30, 2017 2016 2017 2016 Basic weighted average shares outstanding 4,882,705 4,869,079 4,877,338 4,864,924 Dilutive effect of granted options 10,443 8,614 17,412 8,316 Diluted weighted average shares outstanding 4,893,148 4,877,693 4,894,750 4,873,240 Net income $ 1,607,469 $ 1,752,290 $ 4,828,247 $ 5,057,463 Net income per share-basic $ 0.33 $ 0.36 $ 0.99 $ 1.04 Net income per share-diluted $ 0.33 $ 0.36 $ 0.99 $ 1.04

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2017
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 nine months ended September 30, 2017. Directors’ Plan 2013 Plan Weighted Weighted Number Average Number Average of Exercise of Exercise Shares Price Shares Price Outstanding at December 31, 2016 78,000 $ 21.08 — $ — Granted — — — — Exercised (6,000 ) 20.94 — — Expired (9,000 ) 22.00 — — Outstanding at September 30, 2017 63,000 $ 20.96 — $ —

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Value of Securities Available-for-Sale	The amortized cost and estimated fair value of securities available-for-sale Gross Gross September 30, 2017 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 183,095,272 $ — $ 3,090,044 $ 180,005,228 Mortgage backed securities 223,005,218 85,489 3,812,513 219,278,194 State, County, Municipals 117,883,069 1,003,224 2,972,681 115,913,612 Other investments 2,865,294 173,763 — 3,039,057 Total $ 526,848,853 $ 1,262,476 $ 9,875,238 $ 518,236,091 Gross Gross December 31, 2016 Amortized Unrealized Unrealized Estimated Cost Gains Losses Fair Value Securities available-for-sale Obligations of U.S. Government agencies $ 207,080,794 $ — $ 7,114,186 $ 199,966,608 Mortgage backed securities 152,765,924 340,419 4,841,633 148,264,710 State, County, Municipals 150,503,811 1,269,356 6,851,017 144,922,150 Other investments 2,869,761 101,345 — 2,971,106 Total $ 513,220,290 $ 1,711,120 $ 18,806,836 $ 496,124,574
Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity	The amortized cost and estimated fair value of securities by contractual maturity at September 30, 2017 and December 31, 2016 are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay certain obligations. September 30, 2017 December 31, 2016 Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Available-for-sale Due in one year or less $ 3,294,221 $ 3,331,064 $ 6,333,181 $ 6,370,921 Due after one year through five years 64,109,627 63,563,038 30,059,503 30,278,557 Due after five years through ten years 65,862,472 65,246,785 126,336,589 122,562,724 Due after ten years 393,582,533 386,095,204 350,491,017 336,912,372 Total $ 526,848,853 $ 518,236,091 $ 513,220,290 $ 496,124,574
Summary of Unrealized Loss Information for Available-for-sale Securities	A summary of unrealized loss information for securities available-for-sale, September 30, 2017 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 161,875 $ 2,654 $ 18,130 $ 436 $ 180,005 $ 3,090 Mortgage backed securities 163,292 2,548 47,507 1,264 210,799 3,812 State, County, Municipal 11,017 215 58,098 2,758 69,115 2,973 Total $ 336,184 $ 5,417 $ 123,735 $ 4,458 $ 459,919 $ 9,875 December 31, 2016 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Description of Securities Value Losses Value Losses Value Losses Obligations of U.S. government agencies $ 195,363 $ 6,753 $ 4,604 $ 362 $ 199,967 $ 7,115 Mortgage backed securities 117,438 4,183 24,353 658 141,791 4,841 State, County, Municipal 95,088 6,663 3,092 188 98,180 6,851 Total $ 407,889 $ 17,599 $ 32,049 $ 1,208 $ 439,938 $ 18,807

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Composition of Net Loans	The composition of net loans (in thousands) at September 30, 2017 and December 31, 2016 was as follows: September 30, 2017 December 31, 2016 Real Estate: Land Development and Construction $ 22,342 $ 23,793 Farmland 18,036 18,175 1-4 97,431 97,812 Commercial Real Estate 183,613 180,880 Total Real Estate Loans 321,422 320,660 Business Loans: Commercial and Industrial Loans 54,154 53,761 Farm Production and Other Farm Loans 1,069 765 Total Business Loans 55,223 54,526 Consumer Loans: Credit Cards 1,202 1,156 Other Consumer Loans 15,495 18,310 Total Consumer Loans 16,697 19,466 Total Gross Loans 393,342 394,652 Unearned Income (264 ) (601 ) Allowance for Loan Losses (3,404 ) (3,903 ) Loans, net $ 389,674 $ 390,148
Period-End Non-Accrual Loans, Segregated by Class	Period-end, non-accrual September 30, 2017 December 31, 2016 Real Estate: Land Development and Construction $ 42 $ 133 Farmland 382 234 1-4 2,169 1,954 Commercial Real Estate 5,066 6,293 Total Real Estate Loans 7,659 8,614 Business Loans: Commercial and Industrial Loans 82 239 Total Business Loans 82 239 Consumer Loans: Other Consumer Loans 92 26 Total Consumer Loans 92 26 Total Nonaccrual Loans $ 7,833 $ 8,879
Aging Analysis of Past Due Loans, Segregated by Class	An aging analysis of past due loans (in thousands), segregated by class, as of September 30, 2017, was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 54 $ — $ 54 $ 22,288 $ 22,342 $ — Farmland 183 31 214 17,822 18,036 — 1-4 3,338 233 3,571 93,860 97,431 — Commercial Real Estate 2,032 155 2,187 181,426 183,613 — Total Real Estate Loans 5,607 419 6,026 315,396 321,422 — Business Loans: Commercial and Industrial Loans 254 247 501 53,653 54,154 247 Farm Production and Other Farm Loans 53 — 53 1,016 1,069 — Total Business Loans 307 247 554 54,669 55,223 247 Consumer Loans: Credit Cards 8 1 9 1,193 1,202 1 Other Consumer Loans 588 70 658 14,837 15,495 51 Total Consumer Loans 596 71 667 16,030 16,697 52 Total Loans $ 6,510 $ 737 $ 7,247 $ 386,095 $ 393,342 $ 299 An aging analysis of past due loans (in thousands), segregated by class, as of December 31, 2016 was as follows: Accruing Loans Loans Loans 90 or more 90 or more 30-89 Days Days Total Past Current Total Days Past Due Past Due Due Loans Loans Loans Past Due Real Estate: Land Development and Construction $ 208 $ 78 $ 286 $ 23,507 $ 23,793 $ — Farmland 584 65 649 17,526 18,175 — 1-4 2,993 596 3,589 94,223 97,812 179 Commercial Real Estate 903 185 1,088 179,792 180,880 — Total Real Estate Loans 4,688 924 5,612 315,048 320,660 179 Business Loans: Commercial and Industrial Loans 66 186 252 53,509 53,761 — Farm Production and Other Farm Loans — — — 765 765 — Total Business Loans 66 186 252 54,274 54,526 — Consumer Loans: Credit Cards 7 3 10 1,146 1,156 3 Other Consumer Loans 788 27 815 17,495 18,310 27 Total Consumer Loans 795 30 825 18,641 19,466 30 Total Loans $ 5,549 $ 1,140 $ 6,689 $ 387,963 $ 394,652 $ 209
Impaired Loans, Segregated by Class	Impaired loans (in thousands) as of September 30, 2017, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Allowance Real Estate: 1-4 $ 468 $ — $ 468 $ 468 $ 136 $ 167 Commercial Real Estate 4,186 — 4,186 4,186 402 417 Total Real Estate Loans 4,654 — 4,654 4,654 538 584 Business Loans: Commercial and Industrial Loans — — — — — 15 Total Business Loans — — — — — 15 Total Loans $ 4,654 $ — $ 4,654 $ 4,654 $ 538 $ 599 Impaired loans (in thousands) as of December 31, 2016, segregated by class, were as follows: Recorded Recorded Unpaid Investment Investment Total Average Principal With No With Recorded Related Recorded Balance Allowance Allowance Investment Allowance Allowance Real Estate: Land Development and Construction $ — $ — $ — $ — $ — $ 43 Farmland 163 — 163 163 28 87 1-4 1,448 — 1,448 1,448 252 218 Commercial Real Estate 5,327 — 5,327 5,327 469 1,577 Total Real Estate Loans 6,938 — 6,938 6,938 749 1,925 Business Loans: Commercial and Industrial Loans 126 — 126 126 38 19 Total Business Loans 126 — 126 126 38 19 Total Loans $ 7,064 $ — $ 7,064 $ 7,064 $ 787 $ 1,944
Troubled Debt Restructurings Segregated by Class	The following table presents troubled debt restructurings (in thousands, except for number of loans), segregated by class: Pre-Modification Post-Modification September 30, 2017 Outstanding Outstanding Number of Recorded Recorded Loans Investment Investment Commercial real estate 3 $ 4,871 $ 3,160 Total 3 $ 4,871 $ 3,160 Pre-Modification Post-Modification December 31, 2016 Outstanding Outstanding Number of Recorded Recorded Loans Investment Investment Commercial real estate 3 $ 4,871 $ 3,288 Total 3 $ 4,871 $ 3,288
Changes in Troubled Debt Restructurings	Changes in the Corporation’s troubled debt restructurings (in thousands, except for number of loans) are set forth in the table below: Number Recorded of Loans Investment Totals at January 1, 2017 3 $ 3,288 Reductions due to: Principal paydowns (128 ) Total at September 30, 2017 3 $ 3,160
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 September 30, 2017: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 21,375 $ 835 $ 132 $ — $ — $ 22,342 Farmland 16,599 641 796 — — 18,036 1-4 83,316 5,454 8,661 — — 97,431 Commercial Real Estate 154,274 22,259 7,080 — — 183,613 Total Real Estate Loans 275,564 29,189 16,669 — — 321,422 Business Loans: Commercial and Industrial Loans 50,747 3,018 389 — — 54,154 Farm Production and Other Farm Loans 986 12 71 — — 1,069 Total Business Loans 51,733 3,030 460 — — 55,223 Consumer Loans: Credit Cards 1,201 — 1 — — 1,202 Other Consumer Loans 15,158 73 264 — — 15,495 Total Consumer Loans 16,359 73 265 — — 16,697 Total Loans $ 343,656 $ 32,292 $ 17,394 $ — $ — $ 393,342 The following table details the amount of gross loans (in thousands) segregated by loan grade and class, as of December 31, 2016: Special Satisfactory Mention Substandard Doubtful Loss Total 1,2,3,4 5,6 7 8 9 Loans Real Estate: Land Development and Construction $ 23,038 $ 186 $ 569 $ — $ — $ 23,793 Farmland 16,448 776 951 — — 18,175 1-4 86,043 1,754 10,015 — — 97,812 Commercial Real Estate 161,323 11,072 8,485 — — 180,880 Total Real Estate Loans 286,852 13,788 20,020 — — 320,660 Business Loans: Commercial and Industrial Loans 51,985 1,427 349 — — 53,761 Farm Production and Other Farm Loans 727 28 10 — — 765 Total Business Loans 52,712 1,455 359 — — 54,526 Consumer Loans: Credit Cards 1,153 — 3 — — 1,156 Other Consumer Loans 18,027 149 132 2 — 18,310 Total Consumer Loans 19,180 149 135 2 — 19,466 Total Loans $ 358,744 $ 15,392 $ 20,514 $ 2 $ — $ 394,652
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 nine months ended September 30, 2017: Real Business September 30, 2017 Estate Loans Consumer Total Beginning Balance, January 1, 2017 $ 3,117,134 $ 257,554 $ 528,108 $ 3,902,796 (Reversal of) provision for loan losses (482,980 ) 199,355 29,011 (254,614 ) Chargeoffs 126,757 146,139 41,788 314,684 Recoveries 26,188 754 43,493 70,435 Net chargeoffs (recoveries) 100,569 145,385 (1,705 ) 244,249 Ending Balance $ 2,533,585 $ 311,524 $ 558,824 $ 3,403,933 Period end allowance allocated to: Loans individually evaluated for impairment $ 537,897 $ — $ — $ 537,897 Loans collectively evaluated for impairment 1,995,688 311,524 558,824 2,866,036 Ending Balance, September 30, 2017 $ 2,533,585 $ 311,524 $ 558,824 $ 3,403,933 The following table details activity in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2016: Real Business September 30, 2016 Estate Loans Consumer Total Beginning Balance, January 1, 2016 $ 5,238,895 $ 643,248 $ 591,560 $ 6,473,703 (Reversal of) provision for loan losses 214,491 (93,733 ) (23,290 ) 97,468 Chargeoffs 2,508,459 5,428 49,317 2,563,204 Recoveries 32,424 14,381 58,670 105,475 Net chargeoffs (recoveries) 2,476,035 (8,953 ) (9,353 ) 2,457,729 Ending Balance $ 2,977,351 $ 558,468 $ 577,623 $ 4,113,442 Period end allowance allocated to: Loans individually evaluated for impairment $ 848,091 $ — $ — $ 848,091 Loans collectively evaluated for impairment 2,129,260 558,468 577,623 3,265,351 Ending Balance, September 30, 2016 $ 2,977,351 $ 558,468 $ 577,623 $ 4,113,442
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 September 30, 2017 and December 31, 2016 related to each balance in the allowance for possible loan losses by portfolio segment and disaggregated on the basis of the Corporation’s impairment methodology was as follows (in thousands): Real Business September 30, 2017 Estate Loans Consumer Total Loans individually evaluated for specific impairment $ 4,654 $ — $ — $ 4,654 Loans collectively evaluated for general impairment 316,768 55,223 16,697 388,688 $ 321,422 $ 55,223 $ 16,697 $ 393,342 Real Business December 31, 2016 Estate Loans Consumer Total Loans individually evaluated for specific impairment $ 6,938 $ 126 $ — $ 7,064 Loans collectively evaluated for general impairment 313,722 54,400 19,466 387,588 $ 320,660 $ 54,526 $ 19,466 $ 394,652

Fair Value of Financial Instr21

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 180,005,228 $ — $ 180,005,228 Mortgage-backed securities — 219,278,194 — 219,278,194 State, county and municipal obligations — 115,913,612 — 115,913,612 Other investments — — 3,039,057 3,039,057 Total $ — $ 515,197,034 $ 3,039,057 $ 518,236,091 The following table presents assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2016: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Securities available for sale Obligations of U.S. Government Agencies $ — $ 199,966,608 $ — $ 199,966,608 Mortgage-backed securities — 148,264,710 — 148,264,710 State, county and municipal obligations — 144,922,150 — 144,922,150 Other investments — — 2,971,106 2,971,106 Total $ — $ 493,153,468 $ 2,971,106 $ 496,124,574
Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs	The following table reports the activity in assets measured at fair value on a recurring basis using significant unobservable inputs: Fair Value Measurements Using: Significant Unobservable Inputs (Level 3) Structured Financial Product As of September 30, 2017 2016 Beginning Balance $ 2,971,106 $ 2,915,709 Principal payments received (5,067 ) (46,326 ) Unrealized gains included in other comprehensive income 73,018 71,576 Ending Balance $ 3,039,057 $ 2,940,959
Asset Measured at Fair Value on Nonrecurring Basis	For assets measured at fair value on a nonrecurring basis during 2017 that were still held on the Corporation’s balance sheet at September 30, 2017, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 539,865 $ 539,865 Total $ — $ — $ 539,865 $ 539,865 For assets measured at fair value on a nonrecurring basis during 2016 that were still held on the Corporation’s balance sheet at December 31, 2016, the following table provides the hierarchy level and the fair value of the related assets: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Level 1) (Level 2) (Level 3) Totals Impaired loans $ — $ — $ 3,591,516 $ 3,591,516 Other real estate owned — — 1,893,949 1,893,949 Total $ — $ — $ 5,485,465 $ 5,485,465
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 September 30, 2017: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Total Carrying Identical Observable Unobservable Fair September 30, 2017 Value Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 20,791,594 $ 20,791,594 $ — $ — $ 20,791,594 Interest bearing deposits with banks 29,640,509 29,640,509 — — 29,640,509 Securities available-for-sale 518,236,091 — 515,197,034 3,039,057 518,236,091 Net loans 389,674,425 — — 390,351,005 390,351,005 Financial liabilities Deposits $ 754,768,366 $ 567,162,743 $ — $ 187,740,115 $ 754,902,858 Federal Home Loan Bank advances 20,000,000 — — 20,130,400 20,130,400 Securities Sold under Agreement to Repurchase 149,451,950 149,451,950 — — 149,451,950 The following represents the carrying value and estimated fair value of the Corporation’s financial instruments at December 31, 2016: Fair Value Measurements Using: Quoted Prices in Active Significant Markets for Other Significant Total Carrying Identical Observable Unobservable Fair December 31, 2016 Value Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) Financial assets Cash and due from banks $ 21,688,557 $ 21,688,557 $ — $ — $ 21,688,557 Interest bearing deposits with banks 48,603,182 48,603,182 — — 48,603,182 Securities available-for-sale 496,124,574 — 493,153,468 2,971,106 496,124,574 Net loans 390,148,343 — — 391,106,337 391,106,337 Financial liabilities Deposits $ 760,152,340 $ 563,440,632 $ — $ 196,859,851 $ 760,300,483 Federal Home Loan Bank advances 20,000,000 — — 20,283,999 20,283,999 Securities Sold under Agreement to Repurchase 150,282,913 150,282,913 — — 150,282,913
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) Used in Valuation of Assets and Liabilities Measured at Fair Value	The following table presents information as of September 30, 2017 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis: Financial instrument Fair Value Valuation Technique Significant Range of Inputs Trust preferred securities $ 3,039,057 Discounted cash flows Default rate 0-100%
Fair Value, Measurements, Nonrecurring [Member]
Significant Unobservable Inputs (Level 3) Used in Valuation of Assets and Liabilities Measured at Fair Value	The following table presents information as of September 30, 2017 about significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation Technique Significant Unobservable Range of Impaired loans $ 539,865 Appraised value of collateral less Estimated costs to sell 25%

Commitments and Contingent Li22

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 38,122,030	$ 37,194,220
Letters of credit outstanding	$ 2,713,880	$ 3,456,180

Net Income per Share - Earnings

Net Income per Share - Earnings Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	4,882,705	4,869,079	4,877,338	4,864,924
Dilutive effect of granted options	10,443	8,614	17,412	8,316
Diluted weighted average shares outstanding	4,893,148	4,877,693	4,894,750	4,873,240
Net income	$ 1,607,469	$ 1,752,290	$ 4,828,247	$ 5,057,463
Net income per share-basic	$ 0.33	$ 0.36	$ 0.99	$ 1.04
Net income per share-diluted	$ 0.33	$ 0.36	$ 0.99	$ 1.04

Equity Compensation Plans - Sum

Equity Compensation Plans - Summary of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2017$ / 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	78,000
Granted | shares	0
Exercised | shares	(6,000)
Expired | shares	(9,000)
Ending Balance | shares	63,000
Weighted Average Exercise Price
Beginning Balance | $ / shares	$ 21.08
Granted | $ / shares	0
Exercised | $ / shares	20.94
Expired | $ / shares	22
Ending Balance | $ / shares	$ 20.96

Equity Compensation Plans - Add

Equity Compensation Plans - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2017USD ($)shares	Sep. 30, 2017USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options granted		$ 258,885
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	$ 180,225	$ 180,225
Restricted stock cost	15,018
Restricted stock, deferred taxes	$ 5,602
Number of restricted Shares Vested | shares	1,500	1,500
Directors Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options granted		$ 258,885
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options granted	$ 0
Granted, shares | shares	0

Securities - Amortized Cost and

Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 526,848,853	$ 513,220,290
Gross Unrealized Gains	1,262,476	1,711,120
Gross Unrealized Losses	9,875,238	18,806,836
Estimated Fair Value	518,236,091	496,124,574
Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	183,095,272	207,080,794
Gross Unrealized Losses	3,090,044	7,114,186
Estimated Fair Value	180,005,228	199,966,608
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	223,005,218	152,765,924
Gross Unrealized Gains	85,489	340,419
Gross Unrealized Losses	3,812,513	4,841,633
Estimated Fair Value	219,278,194	148,264,710
State, County and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	117,883,069	150,503,811
Gross Unrealized Gains	1,003,224	1,269,356
Gross Unrealized Losses	2,972,681	6,851,017
Estimated Fair Value	115,913,612	144,922,150
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,865,294	2,869,761
Gross Unrealized Gains	173,763	101,345
Estimated Fair Value	$ 3,039,057	$ 2,971,106

Securities - Amortized Cost a27

Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale, Amortized Cost
Due in one year or less	$ 3,294,221	$ 6,333,181
Due after one year through five years	64,109,627	30,059,503
Due after five years through ten years	65,862,472	126,336,589
Due after ten years	393,582,533	350,491,017
Amortized Cost	526,848,853	513,220,290
Available-for-sale, Estimated Fair Value
Due in one year or less	3,331,064	6,370,921
Due after one year through five years	63,563,038	30,278,557
Due after five years through ten years	65,246,785	122,562,724
Due after ten years	386,095,204	336,912,372
Total Fair Value	$ 518,236,091	$ 496,124,574

Securities - Summary of Unreali

Securities - Summary of Unrealized Loss Information for Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 336,184	$ 407,889
Less than 12 months Unrealized Losses	5,417	17,599
12 months or more Fair Value	123,735	32,049
12 months or more Unrealized Losses	4,458	1,208
Total Fair Value	459,919	439,938
Total Unrealized Losses	9,875	18,807
Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	161,875	195,363
Less than 12 months Unrealized Losses	2,654	6,753
12 months or more Fair Value	18,130	4,604
12 months or more Unrealized Losses	436	362
Total Fair Value	180,005	199,967
Total Unrealized Losses	3,090	7,115
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	163,292	117,438
Less than 12 months Unrealized Losses	2,548	4,183
12 months or more Fair Value	47,507	24,353
12 months or more Unrealized Losses	1,264	658
Total Fair Value	210,799	141,791
Total Unrealized Losses	3,812	4,841
State, County and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	11,017	95,088
Less than 12 months Unrealized Losses	215	6,663
12 months or more Fair Value	58,098	3,092
12 months or more Unrealized Losses	2,758	188
Total Fair Value	69,115	98,180
Total Unrealized Losses	$ 2,973	$ 6,851

Loans - Composition of Net Loan

Loans - Composition of Net Loans (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans	$ 393,342,000	$ 394,652,000
Unearned Income	(264,000)	(601,000)
Allowance for Loan Losses	(3,403,933)	(3,902,796)	$ (4,113,442)	$ (6,473,703)
Loans, net	389,674,425	390,148,343
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	321,422,000	320,660,000
Total Gross Loans	321,422,000	320,660,000
Allowance for Loan Losses	(2,533,585)	(3,117,134)	(2,977,351)	(5,238,895)
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	22,342,000	23,793,000
Total Gross Loans	22,342,000	23,793,000
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,036,000	18,175,000
Total Gross Loans	18,036,000	18,175,000
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	97,431,000	97,812,000
Total Gross Loans	97,431,000	97,812,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	183,613,000	180,880,000
Total Gross Loans	183,613,000	180,880,000
Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	55,223,000	54,526,000
Total Gross Loans	55,223,000	54,526,000
Allowance for Loan Losses	(311,524)	(257,554)	(558,468)	(643,248)
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	54,154,000	53,761,000
Total Gross Loans	54,154,000	53,761,000
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business loans	1,069,000	765,000
Total Gross Loans	1,069,000	765,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,697,000	19,466,000
Total Gross Loans	16,697,000	19,466,000
Allowance for Loan Losses	(558,824)	(528,108)	$ (577,623)	$ (591,560)
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,202,000	1,156,000
Total Gross Loans	1,202,000	1,156,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,495,000	18,310,000
Total Gross Loans	$ 15,495,000	$ 18,310,000

Loans - Period-End Non-Accrual

Loans - Period-End Non-Accrual Loans, Segregated by Class (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	$ 7,833	$ 8,879
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	7,659	8,614
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	42	133
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	382	234
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	2,169	1,954
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	5,066	6,293
Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	82	239
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	82	239
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	92	26
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual Loans	$ 92	$ 26

Loans - Aging Analysis of Past

Loans - Aging Analysis of Past Due Loans, Segregated by Class (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	$ 6,510	$ 5,549
Total Past Due Loans	7,247	6,689
Current Loans	386,095	387,963
Total Gross Loans	393,342	394,652
Accruing Loans 90 or more Days Past Due	299	209
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	5,607	4,688
Total Past Due Loans	6,026	5,612
Current Loans	315,396	315,048
Total Gross Loans	321,422	320,660
Accruing Loans 90 or more Days Past Due		179
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	54	208
Total Past Due Loans	54	286
Current Loans	22,288	23,507
Total Gross Loans	22,342	23,793
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	183	584
Total Past Due Loans	214	649
Current Loans	17,822	17,526
Total Gross Loans	18,036	18,175
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	3,338	2,993
Total Past Due Loans	3,571	3,589
Current Loans	93,860	94,223
Total Gross Loans	97,431	97,812
Accruing Loans 90 or more Days Past Due		179
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	2,032	903
Total Past Due Loans	2,187	1,088
Current Loans	181,426	179,792
Total Gross Loans	183,613	180,880
Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	307	66
Total Past Due Loans	554	252
Current Loans	54,669	54,274
Total Gross Loans	55,223	54,526
Accruing Loans 90 or more Days Past Due	247
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	254	66
Total Past Due Loans	501	252
Current Loans	53,653	53,509
Total Gross Loans	54,154	53,761
Accruing Loans 90 or more Days Past Due	247
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	53
Total Past Due Loans	53
Current Loans	1,016	765
Total Gross Loans	1,069	765
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	596	795
Total Past Due Loans	667	825
Current Loans	16,030	18,641
Total Gross Loans	16,697	19,466
Accruing Loans 90 or more Days Past Due	52	30
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	8	7
Total Past Due Loans	9	10
Current Loans	1,193	1,146
Total Gross Loans	1,202	1,156
Accruing Loans 90 or more Days Past Due	1	3
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-89 Days Past Due	588	788
Total Past Due Loans	658	815
Current Loans	14,837	17,495
Total Gross Loans	15,495	18,310
Accruing Loans 90 or more Days Past Due	51	27
Loans 90 or more Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	737	1,140
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	419	924
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		78
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	31	65
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	233	596
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	155	185
Loans 90 or more Days Past Due [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	247	186
Loans 90 or more Days Past Due [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	247	186
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	71	30
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	1	3
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	$ 70	$ 27

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
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 (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 4,654,000	$ 7,064,000
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	4,654,471	7,064,185
Total Recorded Investment	4,654,000	7,064,000
Related Allowance	537,897	786,893
Average Recorded Allowance	599,000	1,944,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,654,000	6,938,000
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	4,654,000	6,938,000
Total Recorded Investment	4,654,000	6,938,000
Related Allowance	538,000	749,000
Average Recorded Allowance	584,000	1,925,000
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		0
Average Recorded Allowance		43,000
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		163,000
Recorded Investment With No Allowance		0
Recorded Investment With Allowance		163,000
Total Recorded Investment		163,000
Related Allowance		28,000
Average Recorded Allowance		87,000
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	468,000	1,448,000
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	468,000	1,448,000
Total Recorded Investment	468,000	1,448,000
Related Allowance	136,000	252,000
Average Recorded Allowance	167,000	218,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,186,000	5,327,000
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	4,186,000	5,327,000
Total Recorded Investment	4,186,000	5,327,000
Related Allowance	402,000	469,000
Average Recorded Allowance	417,000	1,577,000
Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		126,000
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance		126,000
Total Recorded Investment		126,000
Related Allowance		38,000
Average Recorded Allowance	15,000	19,000
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		126,000
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance		126,000
Total Recorded Investment		126,000
Related Allowance		38,000
Average Recorded Allowance	$ 15,000	$ 19,000

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructurings Segregated by Class (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)Loan	Dec. 31, 2016USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	3	3
Post-Modification Outstanding Recorded Investment	$ 3,160	$ 3,288
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	$ 3,160	$ 3,288
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	$ 3,160	$ 3,288

Loans - Changes in Troubled Deb

Loans - Changes in Troubled Debt Restructurings (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)Loan	Dec. 31, 2016USD ($)Loan
Receivables [Abstract]
Number of Loans | Loan	3	3
Principal paydowns, Recorded Investment	$ (128)
Post-Modification Outstanding Recorded Investment	$ 3,160	$ 3,288

Loans - Detailed Amount of Gros

Loans - Detailed Amount of Gross Loans Segregated by Loan Grade and Class (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 393,342	$ 394,652
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	321,422	320,660
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	22,342	23,793
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	18,036	18,175
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	97,431	97,812
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	183,613	180,880
Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	55,223	54,526
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	54,154	53,761
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,069	765
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	16,697	19,466
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,202	1,156
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	15,495	18,310
Satisfactory 1, 2, 3, 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	343,656	358,744
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	275,564	286,852
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	21,375	23,038
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	16,599	16,448
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	83,316	86,043
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	154,274	161,323
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	51,733	52,712
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	50,747	51,985
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	986	727
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	16,359	19,180
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,201	1,153
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	15,158	18,027
Special Mention 5,6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	32,292	15,392
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	29,189	13,788
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	835	186
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	641	776
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	5,454	1,754
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	22,259	11,072
Special Mention 5,6 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	3,030	1,455
Special Mention 5,6 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	3,018	1,427
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	12	28
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	73	149
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	73	149
Substandard 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	17,394	20,514
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	16,669	20,020
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	132	569
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	796	951
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	8,661	10,015
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	7,080	8,485
Substandard 7 [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	460	359
Substandard 7 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	389	349
Substandard 7 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	71	10
Substandard 7 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	265	135
Substandard 7 [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1	3
Substandard 7 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 264	132
Doubtful 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans		2
Doubtful 8 [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans		2
Doubtful 8 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans		$ 2

Loans - Detailed Activity in Al

Loans - Detailed Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			$ 3,902,796	$ 6,473,703
(Reversal of) provision for loan losses	$ (73,808)	$ 184,018	(254,614)	97,468
Chargeoffs			314,684	2,563,204
Recoveries			70,435	105,475
Net chargeoffs (recoveries)			244,249	2,457,729
Ending Balance	3,403,933	4,113,442	3,403,933	4,113,442
Loans individually evaluated for impairment					$ 537,897	$ 848,091
Loans collectively evaluated for impairment					2,866,036	3,265,351
Ending Balance	3,403,933	4,113,442	3,403,933	4,113,442	3,403,933	4,113,442
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			3,117,134	5,238,895
(Reversal of) provision for loan losses			(482,980)	214,491
Chargeoffs			126,757	2,508,459
Recoveries			26,188	32,424
Net chargeoffs (recoveries)			100,569	2,476,035
Ending Balance	2,533,585	2,977,351	2,533,585	2,977,351
Loans individually evaluated for impairment					537,897	848,091
Loans collectively evaluated for impairment					1,995,688	2,129,260
Ending Balance	2,533,585	2,977,351	2,533,585	2,977,351	2,533,585	2,977,351
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			257,554	643,248
(Reversal of) provision for loan losses			199,355	(93,733)
Chargeoffs			146,139	5,428
Recoveries			754	14,381
Net chargeoffs (recoveries)			145,385	(8,953)
Ending Balance	311,524	558,468	311,524	558,468
Loans collectively evaluated for impairment					311,524	558,468
Ending Balance	311,524	558,468	311,524	558,468	311,524	558,468
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			528,108	591,560
(Reversal of) provision for loan losses			29,011	(23,290)
Chargeoffs			41,788	49,317
Recoveries			43,493	58,670
Net chargeoffs (recoveries)			(1,705)	(9,353)
Ending Balance	558,824	577,623	558,824	577,623
Loans collectively evaluated for impairment					558,824	577,623
Ending Balance	$ 558,824	$ 577,623	$ 558,824	$ 577,623	$ 558,824	$ 577,623

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	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment	$ 4,654	$ 7,064
Loans collectively evaluated for general impairment	388,688	387,588
Total Gross Loans	393,342	394,652
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment	4,654	6,938
Loans collectively evaluated for general impairment	316,768	313,722
Total Gross Loans	321,422	320,660
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for specific impairment		126
Loans collectively evaluated for general impairment	55,223	54,400
Total Gross Loans	55,223	54,526
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans collectively evaluated for general impairment	16,697	19,466
Total Gross Loans	$ 16,697	$ 19,466

Fair Values of Financial Instru

Fair Values of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 518,236,091	$ 496,124,574
Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	180,005,228	199,966,608
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	219,278,194	148,264,710
State, County and Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	115,913,612	144,922,150
Other Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,039,057	2,971,106
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	515,197,034	493,153,468
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,039,057	2,971,106
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	518,236,091	496,124,574
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	180,005,228	199,966,608
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	219,278,194	148,264,710
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	115,913,612	144,922,150
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	3,039,057	2,971,106
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	515,197,034	493,153,468
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	180,005,228	199,966,608
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	219,278,194	148,264,710
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	115,913,612	144,922,150
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	3,039,057	2,971,106
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	$ 3,039,057	$ 2,971,106

Fair Values of Financial Inst40

Fair Values of Financial Instruments - Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Beginning Balance	$ 2,971,106	$ 2,915,709
Principal payments received	(5,067)	(46,326)
Unrealized gains included in other comprehensive income	73,018	71,576
Ending Balance	$ 3,039,057	$ 2,940,959

Fair Values of Financial Inst41

Fair Values of Financial Instruments - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
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	4,654,471	7,064,185
Impaired loans, allowance for loan losses	537,897	786,893
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned acquired	11,200	2,187,125
Other real estate owned ("OREO") sold during period	11,200
Additional write downs on OREO previously acquired	$ 0	$ 220,419

Fair Values of Financial Inst42

Fair Values of Financial Instruments - Significant Unobservable Inputs (Level 3) used in Valuation of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 3,039,057	$ 2,971,106	$ 2,940,959	$ 2,915,709
Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 3,039,057
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique	Discounted cash flows
Minimum [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Default rate	0.00%
Maximum [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Default rate	100.00%

Fair Values of Financial Inst43

Fair Values of Financial Instruments - Asset Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring Basis	$ 539,865	$ 5,485,465
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	539,865	3,591,516
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		1,893,949
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	539,865	5,485,465
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	$ 539,865	3,591,516
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		$ 1,893,949

Fair Values of Financial Inst44

Fair Values 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 ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 539,865	$ 5,485,465
Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 539,865	$ 3,591,516
Valuation Technique	Appraised value of collateral less estimated costs to sell
Estimated costs to sell	25.00%

Fair Values of Financial Inst45

Fair Values of Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Financial assets
Cash and due from banks	$ 20,791,594	$ 21,688,557
Interest bearing deposits with banks	29,640,509	48,603,182
Securities available-for-sale	518,236,091	496,124,574
Net loans	390,351,005	391,106,337
Financial liabilities
Deposits	754,902,858	760,300,483
Federal Home Loan Bank advances	20,130,400	20,283,999
Securities Sold under Agreement to Repurchase	149,451,950	150,282,913
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Cash and due from banks	20,791,594	21,688,557
Interest bearing deposits with banks	29,640,509	48,603,182
Financial liabilities
Deposits	567,162,743	563,440,632
Securities Sold under Agreement to Repurchase	149,451,950	150,282,913
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Securities available-for-sale	515,197,034	493,153,468
Significant Unobservable Inputs (Level 3) [Member]
Financial assets
Securities available-for-sale	3,039,057	2,971,106
Net loans	390,351,005	391,106,337
Financial liabilities
Deposits	187,740,115	196,859,851
Federal Home Loan Bank advances	20,130,400	20,283,999
Carrying Value [Member]
Financial assets
Cash and due from banks	20,791,594	21,688,557
Interest bearing deposits with banks	29,640,509	48,603,182
Securities available-for-sale	518,236,091	496,124,574
Net loans	389,674,425	390,148,343
Financial liabilities
Deposits	754,768,366	760,152,340
Federal Home Loan Bank advances	20,000,000	20,000,000
Securities Sold under Agreement to Repurchase	$ 149,451,950	$ 150,282,913