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Small Business Lending Fund (Q2) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 06, 2017
Jan. 30, 2017
Feb. 04, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Class of Stock [Line Items]                      
Preferred stock, shares issued (in shares)       0   0   0 12,000    
Preferred stock, dividend rate (as a percent)     9.00%         9.00%   1.00%  
Preferred stock dividends       $ 0 $ 0 $ 0 $ 195,000 $ 195,000 $ 1,022,000 $ 120,000  
Proceeds from issuance of common stock           1,079,979 37,591,479 37,852,113 803,957    
Payments for redemption of preferred stock $ 12,000,000                    
Payment of dividends on preferred stock $ 195,000         $ 0 $ 195,000 $ 195,000 $ 752,000    
SBLF Program [Member]                      
Class of Stock [Line Items]                      
Preferred stock, shares issued (in shares)                   12,000 12,000
Share price (in dollars per share)                   $ 1,000 $ 1,000
Common Stock [Member]                      
Class of Stock [Line Items]                      
Issuance of common stock in public offering (in shares)   2,010,084                  
Proceeds from issuance of common stock   $ 33,200,000