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Short-Term Borrowings (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($)
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,667,513 | $ 2,714,872
FHLB Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,100,000 | $ 2,035,000
FHLB Borrowings [Member] | FHLB Borrowings, 5 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Number of fixed rate short-term borrowings | item | 5 |
FHLB Borrowings [Member] | FHLB Borrowings, 5 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member] | Minimum [Member] |  |
Short-term Debt [Line Items] |  |
Short-term maturity year | 2034 |
FHLB Borrowings [Member] | FHLB Borrowings, 5 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member] | Maximum [Member] |  |
Short-term Debt [Line Items] |  |
Short-term maturity year | 2035 |

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