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Long-term Debt and Short-term Borrowings (Short Term Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Securities sold under repurchase agreements $ 227,922 $ 165,690  
Trading liability for short positions 7,717 1,560  
FHLB advances with original maturities of one year or less 0 1,752,000  
Total short-term borrowings $ 235,639 $ 1,919,250 $ 887,692