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Mergers and Acquisitions - CSFL Narrative (Details)
$ in Thousands
3 Months Ended
Jun. 07, 2020
USD ($)
shares
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mergers and Acquisitions        
Goodwill   $ 1,579,758 $ 1,563,942  
CSFL        
Mergers and Acquisitions        
Shares of the common stock in exchange for each share 0.3001      
Number of shares issued as consideration | shares 37,271,069      
Purchase price $ 2,256,708      
Value of the conversion of outstanding stock options and restricted stock 15,500      
Purchased price decreased     $ 5,200  
Stock option conversion 2,900      
Loans at fair value acquired 12,950,583      
Loans at fair value acquired after initial fair value adjustment 13,000,000      
Estimated discount on loans $ 239,500      
Estimated discount on loans (as a percent) 1.82%      
Fair value adjustment on loans acquired   29,800    
Loans acquired as a percentage of total loans 113.90%      
Credit deficiencies that were identified as Purchased Credit Deteriorated ("PCD") loans. $ 3,100,000      
Estimated fair value of intangible asset 140,862      
Goodwill 561,042 561,000    
Acquisition costs   10,000   $ 4,100
CSFL | Core Deposits        
Mergers and Acquisitions        
Estimated fair value of intangible asset $ 125,900      
Estimated economic life of intangible asset 10 years      
Subsequent Fair Value Adjustments | CSFL        
Mergers and Acquisitions        
Loans at fair value acquired $ 29,834      
Estimated fair value of intangible asset 10,000 10,000    
Goodwill $ (39,441) $ 39,400