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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 |  |  |

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