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Subsequent Events - Narrative (Details) - USD ($)
Nov. 01, 2018
Oct. 31, 2018
Sep. 30, 2018
Jun. 27, 2018
Dec. 31, 2017
Subsequent Event [Line Items]          
Common stock, shares outstanding (in shares)     12,750,272   11,152,561
Foothills Bancorp [Member]          
Subsequent Event [Line Items]          
Cash paid upon conversion (in dollars per share)       $ 1.75  
Common shares converted (in shares)       0.666  
Subsequent Event [Member] | Foothills Bancorp [Member]          
Subsequent Event [Line Items]          
Common stock, shares outstanding (in shares)   1,776,925      
Cash consideration paid $ 3,110,603        
Common stock issued (in shares) 1,183,232