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Commitments and Contingencies (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 471,238,000 | $ 407,837,000 | $ 471,238,000 | $ 407,837,000 | $ 457,010,000 | $ 443,424,000 | $ 414,956,000 | $ 427,597,000
Covered chargebacks, net of reserves |  |  |  |  |  | 15,300,000 |  |
Minimum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 0 |  | 0 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 5,000,000 |  | 5,000,000 |  |  |  |  |
Fair Value, Measurements, Nonrecurring Basis | Qualpay receivable | Other Operating Income (Expense) |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Assets, fair value adjustment |  |  | 2,700,000 |  |  |  |  |
Fair Value, Measurements, Nonrecurring Basis | Qualpay receivable | Non-Interest Income |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Assets, fair value adjustment |  |  | 13,100,000 |  |  |  |  |
Fair Value, Measurements, Nonrecurring Basis | Level 3 |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Qualpay receivable | 31,100,000 |  | 31,100,000 |  |  |  |  |
Guarantee obligations |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Maximum potential exposure for sponsored transactions | 29,390,000,000 | $ 31,000,000,000 | 59,500,000,000 | $ 59,600,000,000 |  |  |  |
Total letters of credit and unfunded lending commitments | 16,772,795,000 |  | 16,772,795,000 |  |  | 17,181,946,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 55,700,000 |  | $ 55,700,000 |  |  | $ 57,500,000 |  |

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