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Borrowings (Short-Term) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 738,233 | $ 572,287
Additional secured debt available | 8,990,000 |
Securities sold under customer repurchase agreements |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 442,956 | 543,936
Notes payable to FHLB of Atlanta |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 255,000 | 28,500
Other short-term debt |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 40,277 | 0
Unamortized purchase accounting adjustments |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 0 | $ (149)
Unsecured Debt |  |
Short-term Debt [Line Items] |  |
Accessible overnight borrowings | $ 582,700 |

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