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Business Combinations - Textuals (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jul. 02, 2018
Jan. 16, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 29, 2018
Jan. 12, 2018
Business Acquisition [Line Items]                
Share price (in usd per share)     $ 31.80 $ 31.80        
Number of shares forfeited to pay applicable taxes (in shares)     26,741 26,741        
Goodwill       $ 121,910 $ 0 $ 0    
Puget Sound                
Business Acquisition [Line Items]                
Number of shares issued (in shares)   1.1688            
Number of shares issued   4,112,258            
Share price (in usd per share)   $ 31.80           $ 31.80
Fair value of shares issued   $ 130,800            
Share price paid in cash (in usd per share)   $ 3,000            
Total consideration paid   $ 130,773            
Total fair value of shares forfeited to pay applicable taxes   $ 851            
Number of shares forfeited to pay applicable taxes (in shares)   26,741            
Acquisition-related costs       5,400 $ 810      
Goodwill   $ 68,520   68,500        
Premier Commercial                
Business Acquisition [Line Items]                
Number of shares issued (in shares) 0.4863              
Number of shares issued 2,848,579              
Share price (in usd per share) $ 34.85           $ 34.85  
Fair value of shares issued $ 99,300              
Share price paid in cash (in usd per share) $ 2,000              
Total consideration paid $ 99,275              
Acquisition-related costs       4,900        
Goodwill $ 53,390     $ 53,400        
Goodwill, purchase accounting adjustment     $ 102