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Subsequent Events (Details) - USD ($)
3 Months Ended
May 03, 2021
Apr. 30, 2021
Apr. 01, 2021
Mar. 31, 2021
Mar. 31, 2020
Feb. 01, 2021
Dec. 31, 2020
Subsequent Event [Line Items]              
Dividends declared per share (usd per share)       $ 0.25 $ 0.60    
Assets       $ 32,856,533,000     $ 29,498,442,000
Goodwill       $ 1,204,092,000     $ 1,078,670,000
Civic              
Subsequent Event [Line Items]              
Assets           $ 308,019,000  
Goodwill           $ 125,422,000  
Subsequent Event | Dividend Declared              
Subsequent Event [Line Items]              
Dividends declared per share (usd per share) $ 0.25            
Subsequent Event | April 30, 2021 Issuance              
Subsequent Event [Line Items]              
Subordinated Debt   $ 400,000,000          
Subordinated Borrowing, Interest Rate   3.25%          
Subsequent Event | HOASD              
Subsequent Event [Line Items]              
Deposit Premium on Acquisition     5.90%        
Business Combination, Consideration Transferred     $ 250,000,000        
Business Combination, Deposits Acquired     $ 4,000,000,000