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Acquisitions - The Banc Ed Corp. and Cummins-American Corp. (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Jan. 19, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
Jan. 15, 2021
$ / shares
GSB      
Merger agreement      
Special cash dividend $ 60.0    
CAC      
Merger agreement      
Special cash dividend $ 60.0    
CAC      
Merger agreement      
Share consideration conversion ratio 444.4783    
Per share cash consideration entitled (in dollars per share) | $ / shares $ 27,969.67    
Common stock Cash consideration 73.00%    
Common stock share consideration 27.00%    
Share price | $ / shares     $ 23.54
Business acquisition share price | $ / shares $ 38,432.69    
Market value of common stock issued $ 190.8    
Adjustments to the fair value assigned to various assets and liabilities $ 169.6    
Pre-tax acquisition expenses   $ 0.3