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Borrowings (Short-Term) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Short-term Debt [Line Items] |  |
Additional secured debt available | $ 12,870,000 |
Securities sold under customer repurchase agreements |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 589,101 | $ 641,487
Unsecured Debt |  |
Short-term Debt [Line Items] |  |
Accessible overnight borrowings | $ 556,000 |

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