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Borrowings (Short-Term) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 641,487 | $ 738,233
Additional secured debt available | 11,310,000 |
Securities sold under customer repurchase agreements |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 641,487 | 442,956
Notes payable to FHLB of Atlanta |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 0 | 255,000
Other short-term debt |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 0 | $ 40,277
Unsecured Debt |  |
Short-term Debt [Line Items] |  |
Accessible overnight borrowings | $ 598,000 |

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