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Condensed Parent Information, Statements of Income (FY) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
INCOME              
Interest income $ 22,993,384 $ 11,517,489 $ 42,371,438 $ 22,466,812 $ 52,022,396 $ 42,564,391  
EXPENSES              
Interest expense 3,455,362 1,268,821 6,022,096 2,397,784 5,693,353 4,299,682  
Income tax benefit (1,294,707) (725,694) (2,235,162) (1,671,548) (6,428,791) (3,362,080)  
Net income 3,931,556 1,648,286 7,346,326 3,292,138 5,015,064 5,798,808  
Preferred stock dividend requirements 0 0 0 195,000 195,000 1,022,000 $ 120,000
Net income available to common shareholders $ 3,931,556 $ 1,648,286 $ 7,346,326 $ 3,097,138 4,820,064 4,776,808  
Parent [Member]              
INCOME              
Dividends         0 3,000,000  
Interest income         0 0  
Interest and dividend income         0 3,000,000  
EXPENSES              
Interest expense         69,000 17,000  
Other operating expenses         2,657,000 1,146,000  
Loss before equity in undistributed earnings of subsidiaries and income tax benefit         (2,726,000) 1,837,000  
Equity in undistributed earnings of subsidiaries         7,134,000 3,520,000  
Income tax benefit         607,000 442,000  
Net income         5,015,000 5,799,000  
Preferred stock dividend requirements         195,000 1,022,000  
Net income available to common shareholders         $ 4,820,000 $ 4,777,000