Employee Benefits and Retirement Plans (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase decrease in accrued pension liability	$ 716,622	$ 775,423	$ 928,160
Changes to other comprehensive income (loss) on pre-tax basis	62,698	(72,802)
Increased in fair value of plan assets	$ 98,666
Targeted investment portfolio allocated	45.00%
Investments	$ 300,000,000
Expected contribute from employer	480,000	550,000	500,000
Estimated amortization amounts, net loss	544,601
Expense incurred	$ 129,086	472,947	927,935
Stock options exercise period	10 years
Common stock authorized for issuance	196,680
Pension Plan 2018 [Member]
Expected contribute from employer	$ 360,000
Southwest Georgia Bank 401(K) Plan [Member]
Employee contributions	204,565	186,253	188,338
Employee Stock Ownership Plan [Member]
Expected contribute from employer	$ 425,000	400,000	294,642
ESOP holds Corporation's outstanding common stock	256,225
Number of shares are allocated to participants	249,618
Unreleased shares are pledged as collateral	6,607
Long-term debt incurred from repurchasing participants' shares	$ 105,000
Directors and Executive Officers Stock Purchase Plan [Member]
Employee contributions	900
Expense incurred	$ 265,900	$ 290,573	$ 282,600
Dividend Reinvestment and Share Purchase Plan [Member]
Reinvestment of common stock dividends, voluntary cash payments description		not less than $5 nor more than $5,000 per month
Shares issued through the plan	5,286	6,955	6,702
Shares issued at an average price per share	$ 21.18	$ 15.92	$ 14.73
2013 Omnibus Incentive Plan [Member]
Common stock authorized for issuance	125,000
Incentive Plan [Member]
Number of restricted stock awards shares granted during the period	4,271
Equity Securities [Member]
Targeted investment portfolio allocated	20.00%
Minimum [Member]
Targeted investment portfolio allocated	50.00%
Maximum [Member]
Targeted investment portfolio allocated	90.00%
Pension Plan [Member]
Increase decrease in accrued pension liability	$ 503,167	$ 110,306