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Consolidated Statements of Changes in Stockholders' Equity (FY) - 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, 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 |  |  |  | 5,798,808 |
Other comprehensive gain | (650,119) |  |  |  |  | (650,119)
Exercise of stock options | 803,957 |  | $ 89,556 | 714,401 |  |
Exercise of stock options (in shares) |  | 0 | 89,556 |  |  |
Dividends on preferred stock | (1,022,000) |  |  |  | (1,022,000) |
Stock option compensation expense | 132,635 |  |  | 132,635 |  |
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 |  |  |
Net income | 3,292,138 |  |  |  | 3,292,138 |
Issuance of common stock | 32,934,676 |  | $ 1,840,000 | 31,094,676 |  |
Issuance of stock grants | 31,791 |  | 1,511 | 30,280 |  |
Redemption of preferred stock | (12,000,000) | $ (12,000) |  | (11,988,000) |  |
Exercise of stock options | 4,625,012 |  | 481,717 | 4,143,295 |  |
Dividends on preferred stock | (195,000) |  |  |  | (195,000) |
Stock option compensation expense | 50,530 |  |  | 50,530 |  |
BALANCE at Jun. 30, 2017 | 134,734,011 | 0 | 8,219,261 | 106,793,832 | 19,968,434 | (247,516)
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 |  |  |
Net income | 5,015,064 |  |  |  | 5,015,064 |
Other comprehensive gain | 1,406 |  |  |  |  | 1,406
Reclassification adjustment for tax rate change | 0 |  |  |  | 197,215 | (197,215)
Issuance of common stock | 32,934,676 |  | $ 1,840,000 | 31,094,676 |  |
Issuance of common stock (in shares) |  |  | 1,840,000 |  |  |
Issuance of stock grants | 31,791 |  | $ 1,511 | 30,280 |  |
Issuance of stock grants (in shares) |  |  | 1,511 |  |  |
Redemption of preferred stock | (12,000,000) | $ (12,000) |  | (11,988,000) |  |
Redemption of preferred stock (in shares) |  | (12,000) |  |  |  |
Conversion shares issued to shareholders of Capstone Bancshares, Inc. | 69,783,821 |  | $ 2,908,094 | 66,875,727 |  |
Conversion shares issued to shareholders of Capstone Bancshares, Inc. (in shares) |  |  | 2,908,094 |  |  |
Exercise of stock options | 4,885,646 |  | $ 506,923 | 4,378,723 |  |
Exercise of stock options (in shares) |  | 0 | 506,923 |  |  |
Dividends on preferred stock | (195,000) |  |  |  | (195,000) |
Restricted stock compensation expense | 56,330 |  |  | 56,330 |  |
Stock option compensation expense | 97,966 |  |  | 97,966 |  |
BALANCE at Dec. 31, 2017 | 205,851,840 | $ 0 | $ 11,152,561 | 174,008,753 | 21,888,575 | (1,198,049)
BALANCE (in shares) at Dec. 31, 2017 |  | 0 | 11,152,561 |  |  |
Net income | 7,346,326 |  |  |  | 7,346,326 |
Issuance of common stock | 34,731,922 |  | $ 1,458,981 | 33,272,941 |  |
Issuance of stock grants | 9,062 |  | 394 | 8,668 |  |
Exercise of stock options | 1,070,917 |  | 92,645 | 978,272 |  |
Stock option compensation expense | 244,228 |  |  | 244,228 |  |
BALANCE at Jun. 30, 2018 | $ 247,486,577 |  | $ 12,704,581 | $ 208,512,862 | $ 29,234,901 | $ (2,965,767)

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