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Business Combinations - Textuals (Details) - USD ($)
12 Months Ended
Jul. 02, 2018
Jan. 16, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 29, 2018
Jan. 12, 2018
Business Acquisition [Line Items]              
Goodwill     $ 0 $ 0 $ 121,910,000    
Share price (in usd per share)         $ 31.80    
Number of shares forfeited to pay applicable taxes (in shares)         26,741    
Puget Sound              
Business Acquisition [Line Items]              
Goodwill   $ 68,520,000          
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   $ 130,800,000          
Share price paid in cash (in usd per share)   $ 3,000          
Total consideration paid   $ 130,773,000          
Total fair value of shares forfeited to pay applicable taxes   $ 851,000          
Number of shares forfeited to pay applicable taxes (in shares)   26,741          
Acquisition-related costs     0 75,000 $ 5,400,000    
Premier Commercial              
Business Acquisition [Line Items]              
Goodwill $ 53,390,000            
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 $ 99,300,000            
Share price paid in cash (in usd per share) $ 2,000            
Total consideration paid $ 99,275,000            
Acquisition-related costs     $ 0 $ 57,000 $ 4,900,000