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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 01, 2021
Jul. 30, 2021
Jul. 22, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Subsequent Event [Line Items]              
Dividends declared per share (in dollars per share)       $ 0.1025 $ 0.10 $ 0.21 $ 0.20
Subsequent Event              
Subsequent Event [Line Items]              
Dividends declared per share (in dollars per share)     $ 0.1025        
Subsequent Event | SouthCrest Financial Group, Inc.              
Subsequent Event [Line Items]              
Cash paid in exchange for each share (in dollars per share) $ 10.45            
Shares exchanged for each share (in shares) 0.7318            
Percentage of shares that will be converted to cash consideration 27.50%            
Percentage of shares that will be converted to common stock 72.50%            
Stock price (in dollars per share)   $ 17.90          
Value of combined stock-and-cash transaction   $ 96          
Shares of stock issued (in shares) 4,000,000.0