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Purchased Loans - Narrative (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract]        
Outstanding balance of restructured loans $ 10,515,302,000   $ 10,757,503,000  
Allowance for loan losses attributable to restructured loans $ 173,106,000 $ 120,185,000 $ 176,144,000 $ 52,162,000
Purchased loans        
Loans and Allowance for Loan Losses (Textual) [Abstract]        
Number of restructured loans | loan 0 2    
Restructured loans discontinued past due period 90 days 90 days    
Remaining availability under commitments to lend additional funds on restructured loans $ 153,000 $ 7,000    
Troubled debt restructured that has subsequently defaulted $ 0 0    
Purchased loans | Loan deferral | Loan Deferral Program, CARES Act        
Loans and Allowance for Loan Losses (Textual) [Abstract]        
Number of loan modifications | loan 139      
Modified loans, balance $ 12,000,000      
Purchased loans | Nonaccruing loans        
Loans and Allowance for Loan Losses (Textual) [Abstract]        
Outstanding balance of restructured loans   134,000    
Purchased loans | Restructured loans        
Loans and Allowance for Loan Losses (Textual) [Abstract]        
Outstanding balance of restructured loans 19,140,000 3,797,000    
Allowance for loan losses attributable to restructured loans $ 167,000 $ 56,000