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Loans and Allowance for Credit Losses - Modifications Narrative (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 loan | Dec. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of contracts modified in TDR | 0 | 0 |
Cares Act and ASC 310-40 | Payment Deferral |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of contracts modified in TDR | 31 |  | 36
Troubled debt restructuring | $ | $ 77 |  | $ 72
Troubled debt restructuring, percent of total loans | 1.10% |  | 0.90%

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