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Commitments and Contingencies (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 477,532,000 | $ 421,359,000 | $ 477,532,000 | $ 421,359,000 | $ 471,238,000 | $ 443,424,000 | $ 407,837,000 | $ 427,597,000
Covered chargebacks | 10,800,000 |  | 10,800,000 |  |  |  |  |
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 |  |  |  |  |
Guarantee obligations |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Maximum potential exposure for sponsored transactions | 27,780,000,000 | $ 30,330,000,000 | 87,280,000,000 | $ 89,940,000,000 |  |  |  |
Total letters of credit and unfunded lending commitments | 16,660,498,000 |  | 16,660,498,000 |  |  | 17,181,946,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 55,200,000 |  | $ 55,200,000 |  |  | $ 57,500,000 |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition Indicates, if estimable, the approximate extent to which the proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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