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Commitments and Contingencies - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]          
Reserve for unfunded commitments $ 41,900,000   $ 1,375,000    
Financing receivable, allowance for credit loss 427,597,000 $ 605,736,000 $ 281,402,000 $ 281,402,000 $ 250,555,000
Other Assets          
Loss Contingencies [Line Items]          
Guarantor obligations, advanced payment to merchant 15,300,000        
Total letters of credit and unfunded lending commitments   15,600,000      
Unfunded Loan Commitment          
Loss Contingencies [Line Items]          
Financing receivable, allowance for credit loss   47,800,000      
Minimum          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 0        
Maximum          
Loss Contingencies [Line Items]          
Total letters of credit and unfunded lending commitments 5,000,000        
Guarantee Obligations          
Loss Contingencies [Line Items]          
Guarantor obligations, monetary amount 105,140,000,000 78,190,000,000      
Total letters of credit and unfunded lending commitments $ 16,256,231,000 $ 14,768,588,000