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Consolidated Statements of Changes in Stockholders' Equity - USD ($) | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2014 | $ 55,887,787 | $ 12,000 | $ 2,965,783 | $ 42,508,429 | $ 10,704,776 | $ (303,201)
BALANCE (in shares) at Dec. 31, 2014 |  | 12,000 | 2,965,783 |  |  |
Net income | 1,509,712 | $ 0 | $ 0 | 0 | 1,509,712 | 0
Other comprehensive loss | (48,920) | 0 | 0 | 0 | 0 | (48,920)
Issuance of common stock | 15,000,004 | $ 0 | $ 1,000,003 | 14,000,001 | 0 | 0
Issuance of common stock (in shares) |  | 0 | 1,000,003 |  |  |
Issuance of stock grants | 100,216 |  | $ 6,659 | 93,557 |  |
Issuance of stock grants (in shares) |  |  | 6,659 |  |  |
Stock issuance costs | (840,418) |  |  | (840,418) |  |
Exercise of stock options | 213,542 |  | $ 24,292 | 189,250 |  |
Exercise of stock options (in shares) |  |  | 24,292 |  |  |
Shares retained by shareholders of Cornerstone Bancshares, Inc. | 28,435,075 |  | $ 1,660,836 | 26,774,239 |  |
Shares retained by shareholders of Cornerstone Bancshares, Inc. (in shares) |  |  | 1,660,836 |  |  |
Conversion shares issued to shareholders of SmartFinancial, Inc. | 0 |  | $ 148,904 | (148,904) |  |
Conversion shares issued to shareholders of SmartFinancial, Inc. (in shares) |  |  | 148,904 |  |  |
Dividends on preferred stock | (120,000) | $ 0 | $ 0 | 0 | (120,000) | 0
Stock option compensation expense | 39,861 | 0 | 0 | 39,861 | 0 | 0
BALANCE at Dec. 31, 2015 | 100,176,859 | $ 12,000 | $ 5,806,477 | 82,616,015 | 12,094,488 | (352,121)
BALANCE (in shares) at Dec. 31, 2015 |  | 12,000 | 5,806,477 |  |  |
Net income | 5,798,808 | $ 0 | $ 0 | 0 | 5,798,808 | 0
Other comprehensive loss | (650,119) | 0 | 0 | 0 | 0 | (650,119)
Exercise of stock options | 803,957 | $ 0 | $ 89,556 | 714,401 | 0 | 0
Exercise of stock options (in shares) |  | 0 | 89,556 |  |  |
Dividends on preferred stock | (1,022,000) | $ 0 | $ 0 | 0 | (1,022,000) | 0
Stock option compensation expense | 132,635 | 0 | 0 | 132,635 | 0 | 0
BALANCE at Dec. 31, 2016 | $ 105,240,140 | $ 12,000 | $ 5,896,033 | $ 83,463,051 | $ 16,871,296 | $ (1,002,240)
BALANCE (in shares) at Dec. 31, 2016 |  | 12,000 | 5,896,033 |  |  |

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