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Summary of Significant Accounting Policies - Recent Accounting and Regulatory Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Right to use asset $ 113,400   $ 87,400      
Lease Liability 118,321   88,800      
Allowance for credit losses 457,309 $ 54,400 56,927      
Shareholders' equity 4,647,880   2,373,013   $ 2,366,296 $ 2,308,920
ASU 2016- 02 | Adjustment for ASU            
Right to use asset       $ 82,200    
Lease Liability       $ 82,200    
ASU 2016-13            
Allowance for credit losses   $ 54,438        
ASU 2016-13 | Cumulative Effect of Adoption of ASU            
Shareholders' equity $ (44,820)          
2018-15            
Capitalized implementation costs related to internal use software     $ 2,900