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Loans and Allowance for Loan Losses (FY) (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 1,575,435,000 $ 1,323,258,000 $ 813,376,000  
Less: Allowance for loan losses (7,073,937) (5,860,291) (5,105,000) $ (4,354,000)
Loans, net 1,568,360,556 1,317,397,909 808,271,003  
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 745,864,000 642,988,000 415,208,000  
Less: Allowance for loan losses (3,135,000) (2,465,000) (2,369,000) (1,906,000)
Consumer Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 355,876,000 293,457,000 187,802,000  
Less: Allowance for loan losses (1,528,000) (1,596,000) (1,382,000) (1,015,000)
Construction and Land Development [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 179,431,000 135,409,000 117,869,000  
Less: Allowance for loan losses (744,000) (521,000) (717,000) (627,000)
Commercial and Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 279,771,000 238,087,000 85,022,000  
Less: Allowance for loan losses (1,367,000) (1,062,000) (520,000) (777,000)
Consumer and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 14,493,000 13,317,000 7,475,000  
Less: Allowance for loan losses (300,000) (216,000) (117,000) $ (29,000)
Purchased Credit Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 32,658,000 32,794,000 27,193,000  
Less: Allowance for loan losses (19,000) (16,000) 0  
Loans, net 32,639,000 32,778,000 27,193,000  
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 18,474,000 17,903,000 14,943,000  
Less: Allowance for loan losses (19,000) (16,000) 0  
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 6,987,000 7,450,000 9,004,000  
Less: Allowance for loan losses 0 0 0  
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 5,690,000 5,120,000 1,678,000  
Less: Allowance for loan losses 0 0 0  
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 821,000 858,000 1,568,000  
Less: Allowance for loan losses 0 0 0  
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 686,000 1,463,000 0  
Less: Allowance for loan losses 0 0 0  
All Other Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 1,542,777,000 1,290,464,000 786,183,000  
Less: Allowance for loan losses (7,055,000) (5,844,000) (5,105,000)  
Loans, net 1,535,722,000 1,284,620,000 781,078,000  
All Other Loans [Member] | Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 727,390,000 625,085,000 400,265,000  
All Other Loans [Member] | Consumer Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 348,889,000 286,007,000 178,798,000  
All Other Loans [Member] | Construction and Land Development [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 173,741,000 130,289,000 116,191,000  
All Other Loans [Member] | Commercial and Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 278,950,000 237,229,000 83,454,000  
All Other Loans [Member] | Consumer and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 13,807,000 $ 11,854,000 $ 7,475,000