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Commitments and Contingent Liabilities (Q2) (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Other Commitments
A summary of the Bank’s total contractual amount for all off-balance sheet commitments at June 30, 2018 is as follows: 
Commitments to extend credit
$
299.6
 million
Standby letters of credit
$
3.7
 million
A summary of the Company's total contractual amount for all off-balance sheet commitments at December 31, 2017 is as follows: 
Commitments to extend credit
292.8
 million
Standby letters of credit, issued by the Company
5.5
 million