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Parent Company Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Assets |  |  |  |
Cash and cash equivalents | $ 92,165 | $ 46,552 |  |
Other assets | 7,910 | 6,886 |  |
Total assets | 1,624,625 | 1,340,908 |  |
Liabilities and Shareholders' Equity |  |  |  |
Junior subordinated debentures | 13,403 | 13,403 |  |
Shareholders' equity | 149,686 | 109,872 | $ 94,240 | $ 82,992
Total liabilities and shareholders' equity | 1,624,625 | 1,340,908 |  |
Revenues |  |  |  |
Interest income | 61,209 | 51,191 | 46,030 |
Expenses |  |  |  |
Interest expense | 10,333 | 8,192 | 7,501 |
Income tax benefit | 10,616 | 7,333 | 5,369 |
Net income | 13,045 | 13,036 | 10,167 |
Operating activities |  |  |  |
Net income | 13,045 | 13,036 | 10,167 |
Adjustments to reconcile net income to net cash used for operating activities |  |  |  |
Compensation expense related to stock options and restricted stock grants | 1,258 | 1,998 | 759 |
(Increase) decrease in other assets | (1,421) | (1,867) | (495) |
Financing activities |  |  |  |
Issuance of common stock | 24,758 |  |  |
Net increase (decrease) in cash and cash equivalents | 45,613 | (16,314) | 21,602 |
Cash and cash equivalents, beginning of year | 46,552 | 62,866 | 41,264 |
Cash and cash equivalents, end of year | 92,165 | 46,552 | 62,866 |
Southern First Bancshares, Inc. [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 3,623 | 1,949 |  |
Investment in subsidiaries | 159,440 | 118,526 |  |
Other assets | 32 | 2,804 |  |
Total assets | 163,095 | 123,279 |  |
Liabilities and Shareholders' Equity |  |  |  |
Accounts payable and accrued expenses | 6 | 4 |  |
Junior subordinated debentures | 13,403 | 13,403 |  |
Shareholders' equity | 149,686 | 109,872 |  |
Total liabilities and shareholders' equity | 163,095 | 123,279 |  |
Revenues |  |  |  |
Interest income | 11 | 2 | 4 |
Total revenue | 11 | 2 | 4 |
Expenses |  |  |  |
Interest expense | 514 | 402 | 349 |
Other expenses | 246 | 243 | 829 |
Total expenses | 760 | 645 | 1,178 |
Income tax benefit | 262 | 172 | 212 |
Loss before equity in undistributed net income of subsidiaries | (487) | (471) | (962) |
Equity in undistributed net income of subsidiaries | 13,532 | 13,507 | 11,129 |
Net income | 13,045 | 13,036 | 10,167 |
Operating activities |  |  |  |
Net income | 13,045 | 13,036 | 10,167 |
Adjustments to reconcile net income to net cash used for operating activities |  |  |  |
Equity in undistributed net income of subsidiaries | (13,532) | (13,507) | (11,129) |
Compensation expense related to stock options and restricted stock grants | 1,258 | 1,998 | 759 |
(Increase) decrease in other assets | 2,772 | (449) | (192) |
Increase (decrease) in accounts payable and accrued expenses | 2 | (1) |  |
Net cash used for operating activities | 3,545 | 1,077 | (395) |
Investing activities |  |  |  |
Investment in subsidiaries, net | (27,334) | (668) | (2,250) |
Net cash used for investing activities | (27,334) | (668) | (2,250) |
Financing activities |  |  |  |
Issuance of common stock | 24,758 |  |  |
Proceeds from the exercise of stock options and warrants | 705 | 1,098 | 628 |
Net cash provided by financing activities | 25,463 | 1,098 | 628 |
Net increase (decrease) in cash and cash equivalents | 1,674 | 1,507 | (2,017) |
Cash and cash equivalents, beginning of year | 1,949 | 442 | 2,459 |
Cash and cash equivalents, end of year | $ 3,623 | $ 1,949 | $ 442 |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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