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Commitments and Contingencies - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Loss Contingencies [Line Items]      
Reserve for unfunded commitments $ 53,600,000   $ 57,200,000
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 10,000,000    
Total letters of credit and unfunded lending commitments      
Loss Contingencies [Line Items]      
Guarantor obligations, monetary amount 27,890,000,000 $ 30,120,000,000  
Total letters of credit and unfunded lending commitments $ 15,334,949,000   $ 16,253,624,000