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Acquisition - Narrative (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended
Mar. 08, 2019
USD ($)
office
$ / shares
shares
Mar. 31, 2019
USD ($)
Mar. 07, 2019
$ / shares
Dec. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Share price (in dollars per share) | $ / shares     $ 43.07  
Goodwill acquired   $ 90,300    
TCC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Full-service retail and commercial banking offices | office 6      
Cash consideration per share (in dollars per share) | $ / shares $ 1.84      
Company shares issued per share acquired 0.1972      
Shares issued | shares 4.0      
Cash $ 37,276      
Total consideration paid 209,160      
Merger related costs   $ 7,300   $ 1,300
Goodwill acquired $ 90,300