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Shareholders' Equity (Details) - USD ($)
 12 Months Ended 45 Months Ended
Sep. 01, 2020
May 05, 2019
May 06, 2016
May 05, 2016
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Nov. 30, 2019
Feb. 28, 2019
Mar. 31, 2017
Subsidiary, Sale of Stock [Line Items]                    
Deferred compensation paid to participants             $ 5,500,000      
Equity issued related to acquisition         $ 494,000 $ 3,070,000        
Number of shares repurchased (in shares)         1,117,208 282,000        
Average price (in dollars per share)         $ 28.53 $ 35.51        
Value of repurchased shares         $ 31,900,000 $ 10,000,000        
Authorized repurchase amount         20,000,000   20,000,000 $ 40,000,000 $ 25,000,000  
Carolina Bank                    
Subsidiary, Sale of Stock [Line Items]                    
Deferred compensation plan         $ 2,200,000 $ 2,600,000 $ 2,200,000     $ 7,700,000
SBA Complete                    
Subsidiary, Sale of Stock [Line Items]                    
Earn-out period     3 years 3 years            
Earn-out liability       $ 3,000,000.0            
Stock issued, shares   78,353                
Equity issued related to acquisition   $ 3,100,000                
Magnolia Financial, Inc.                    
Subsidiary, Sale of Stock [Line Items]                    
Loans acquired $ 14,600,000                  
Other assets acquired 500,000                  
Liabilities assumed 11,700,000                  
Total purchase price 10,000,000.0                  
Payments for acquisition $ 9,500,000                  
Number of shares issued 24,096                  
Value of shares issued $ 500,000