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Consolidated Statement of Changes in Stockholders' Equity - 9 months ended Sep. 30, 2015 - USD ($)
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [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     2,965,783      
Stock option compensation expense 10,968 0 $ 0 10,968 0 0
Issuance of common stock 14,046,248 $ 0 $ 936,419 13,109,829 0 0
Issuance of common stock (in shares)     936,419      
Issuance of stock grants 100,216   $ 6,659 93,557 0 0
Issuance of stock grants (in shares)   0 6,659      
Stock issuance costs (840,418) $ 0 $ 0 (840,418) 0 0
Exercise of stock options 133,932 0 $ 13,542 120,390 0 0
Exercise of stock options (in shares)     13,542      
Shares retained by shareholders of Cornerstone Bancshares, Inc. 28,435,075 0 $ 1,660,836 26,774,239 0 0
Shares retained by shareholders of Cornerstone Bancshares, Inc. (in shares)     1,660,836      
Cash dividends on preferred stock (90,000)   $ 0 0 (90,000) 0
Conversion shares issued to shareholders of SmartFinancial, Inc. $ 0   $ 148,904 (148,904) 0 0
Conversion shares issued to shareholders of SmartFinancial, Inc. (in shares) 0   148,904      
Net income $ 327,585 0 $ 0 0 327,585 0
Unrealized holding gains on securities available for sale, net of reclassification adjustment 424,963 0 0 0 0 424,963
BALANCE at Sep. 30, 2015 $ 98,436,356 $ 12,000 $ 5,732,143 $ 81,628,090 $ 10,942,361 $ 121,762
BALANCE (in shares) at Sep. 30, 2015     5,732,143