Stockholders' Equity / Regulatory Matters - Summary of Leverage Ratio (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Total capital (to risk- weighted assets), Ratio	8.00%
Tier I capital (to risk- weighted assets), Ratio	4.50%
Leverage (Tier I capital to average assets), Ratio	9.13%
Tier I capital (to risk- weighted assets), For Capital Adequacy Purposes, Ratio	6.00%
Southwest Georgia Financial Corporation [Member]
Common equity Tier 1 (to risk-weighted assets)	$ 37,230,740
Total capital (to risk- weighted assets), Actual Amount	40,262,982	$ 37,845,154
Tier I capital (to risk- weighted assets), Actual Amount	37,230,740	34,830,148
Leverage (Tier I capital to average assets), Actual Amount	$ 37,230,740	$ 34,830,148
Common equity Tier 1 (to risk-weighted assets), Ratio	14.07%
Total capital (to risk- weighted assets), Ratio	15.22%	15.70%
Tier I capital (to risk- weighted assets), Ratio	14.07%	14.45%
Leverage (Tier I capital to average assets), Ratio	9.13%	9.14%
Common equity Tier 1 (to risk-weighted assets), amount	$ 11,907,692
Total capital (to risk- weighted assets), For Capital Adequacy Purposes, Amount	21,169,230	$ 19,288,109
Tier I capital (to risk- weighted assets), For Capital Adequacy Purposes, Amount	15,876,922	9,644,054
Leverage (Tier I capital to average assets), For Capital Adequacy Purposes, Amount	$ 16,316,153	$ 15,246,906
Common equity Tier 1 (to risk-weighted assets), Ratio	4.50%
Total capital (to risk- weighted assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier I capital (to risk- weighted assets), For Capital Adequacy Purposes, Ratio	6.00%	4.00%
Leverage (Tier I capital to average assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Common equity Tier 1 (to risk-weighted assets)	$ 17,199,999
Total capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	26,461,534	$ 24,110,136
Tier I capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	21,169,230	14,466,082
Leverage (Tier I capital to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 20,395,191	$ 19,058,633
Common equity Tier 1 (to risk-weighted assets), amount	6.50%
Total capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier I capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	6.00%
Leverage (Tier I capital to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Southwest Georgia Bank [Member]
Common equity Tier 1 (to risk-weighted assets)	$ 34,279,795
Total capital (to risk- weighted assets), Actual Amount	37,312,037	$ 36,510,112
Tier I capital (to risk- weighted assets), Actual Amount	34,279,795	33,503,088
Leverage (Tier I capital to average assets), Actual Amount	$ 34,279,795	$ 33,503,088
Common equity Tier 1 (to risk-weighted assets), Ratio	12.99%
Total capital (to risk- weighted assets), Ratio	14.14%	15.18%
Tier I capital (to risk- weighted assets), Ratio	12.99%	13.93%
Leverage (Tier I capital to average assets), Ratio	8.43%	8.81%
Common equity Tier 1 (to risk-weighted assets), amount	$ 11,874,310
Total capital (to risk- weighted assets), For Capital Adequacy Purposes, Amount	21,109,884	$ 19,236,387
Tier I capital (to risk- weighted assets), For Capital Adequacy Purposes, Amount	15,832,413	9,618,193
Leverage (Tier I capital to average assets), For Capital Adequacy Purposes, Amount	$ 16,274,473	$ 15,211,031
Common equity Tier 1 (to risk-weighted assets), Ratio	4.50%
Total capital (to risk- weighted assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier I capital (to risk- weighted assets), For Capital Adequacy Purposes, Ratio	6.00%	4.00%
Leverage (Tier I capital to average assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Common equity Tier 1 (to risk-weighted assets)	$ 17,151,781
Total capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	26,387,355	$ 24,045,483
Tier I capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	21,109,884	14,427,290
Leverage (Tier I capital to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 20,343,091	$ 19,013,789
Common equity Tier 1 (to risk-weighted assets), amount	6.50%
Total capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier I capital (to risk- weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	6.00%
Leverage (Tier I capital to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%