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Business Combination - Atlantic Capital Bank, N.A. Allocation of Purchase Price (Q2) (Details) - USD ($)
Nov. 01, 2017
May 19, 2017
Aug. 31, 2015
Business Acquisition [Line Items]      
Cash consideration paid $ 15,826,000    
Fair value of assets acquired and liabilities assumed:      
Cash and cash equivalents 16,810,000    
Premises and equipment 8,668,000    
Prepaid and other assets 6,360,000    
Total fair value of net assets acquired 47,675,000    
Goodwill $ 38,047,000   $ 42,873,689
Atlantic Capital Bank, N.A. [Member]      
Business Acquisition [Line Items]      
Cash consideration paid   $ 1,183,007  
Fair value of assets acquired and liabilities assumed:      
Cash and cash equivalents   133,000  
Loans   24,073,000  
Premises and equipment   2,839,000  
Core deposit intangible   310,000  
Prepaid and other assets   77,000  
Deposits   (26,888,000)  
Payables and other liabilities   (21,000)  
Total fair value of net assets acquired   523,000  
Goodwill   $ 660,000