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Investment Securities, Securities in Continuous Unrealized Loss Position (Q2) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]        
Less than 12 months, fair value $ 12,871      
Less than 12 months, unrealized losses (354)      
Greater than 12 months, fair value 13,470      
Greater than 12 months, unrealized losses (654)      
Total, fair value 26,341      
Total, unrealized losses (1,008)      
Available-for-sale Securities, Fair Value and Gross Unrealized Losses [Abstract]        
Less than 12 months, fair value     $ 13,494 $ 21,500
Less than 12 months, unrealized losses     (705) (511)
Greater than 12 months, fair value     12,568 141
Greater than 12 months, unrealized losses     (322) (3)
Total, fair value     26,062 21,641
Total, unrealized Losses     (1,027) (514)
Fair value of securities pledged to secure public funds     0  
Proceeds from sales and calls of securities [Abstract]        
Proceeds from sales of securities 0 $ 0 0 802
Pledged [Member]        
Available-for-sale Securities, Fair Value and Gross Unrealized Losses [Abstract]        
Fair value of securities pledged to secure public funds 1,000      
U.S. Government and Federal Agency [Member]        
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]        
Less than 12 months, fair value 7,721   7,101 5,332
Less than 12 months, unrealized losses (236)   (88) (138)
Greater than 12 months, fair value 2,962   2,008 0
Greater than 12 months, unrealized losses (150)   (71) 0
Total, fair value 10,683   9,109 5,332
Total, unrealized losses (386)   (159) (138)
Mortgage-backed Securities [Member]        
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]        
Less than 12 months, fair value 4,864 [1]   5,472 [1],[2] 14,965 [2]
Less than 12 months, unrealized losses (109) [1]   (38) [1],[2] (282) [2]
Greater than 12 months, fair value 10,508 [1]   10,560 [1],[2] 140 [2]
Greater than 12 months, unrealized losses (504) [1]   (250) [1],[2] (2) [2]
Total, fair value 15,372 [1]   16,032 [1],[2] 15,105 [2]
Total, unrealized losses (613) [1]   (288) [1],[2] (284) [2]
Municipal Securities [Member]        
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract]        
Less than 12 months, fair value 286   295  
Less than 12 months, unrealized losses (9)   (2)  
Greater than 12 months, fair value 0   0  
Greater than 12 months, unrealized losses 0   0  
Total, fair value 286   295  
Total, unrealized losses $ (9)   (2)  
Equity Securities [Member]        
Available-for-sale Securities, Fair Value and Gross Unrealized Losses [Abstract]        
Less than 12 months, fair value     626 1,203
Less than 12 months, unrealized losses     (577) (91)
Greater than 12 months, fair value     0 1
Greater than 12 months, unrealized losses     (1) (1)
Total, fair value     626 1,204
Total, unrealized Losses     $ (578) $ (92)
[1] All mortgage-backed securities are issued either by the U.S. Government through GNMA or by government-sponsored enterprises FNMA or FHLMC.
[2] All mortgage-backed securities are issued either by the U.S. Government through GNMA or by government sponsored enterprises FNMA or FHLMC.