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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)