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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance $ 257,471 $ 166,209    
Impact of adopting CECL       $ (43,807)
Loans charged off 8,047 22,050    
Recoveries of loans previously charged off 3,926 6,813    
Current period net charge-offs (4,121) (15,237)    
Provision for credit losses 19,570 63,600    
Ending balance 272,920 272,920    
Cumulative Effect, Period of Adoption, Adjustment        
Allowance for Loan and Lease Losses [Roll Forward]        
Impact of adopting CECL     $ 0 $ 58,348
Off-Balance Sheet        
Allowance for Loan and Lease Losses [Roll Forward]        
Provision for credit losses $ 2,600 1,200    
Off-Balance Sheet | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance   $ 12,600