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Short-Term Borrowings (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) loan item | Dec. 31, 2016 USD ($)
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,703,890 | $ 1,225,406
FHLB Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 1,132,567 | $ 865,000
FHLB Borrowings [Member] | $450 Debt Due 2020 [Member] | Variable-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 450,000 |
Short-term maturity year | 2020 |
FHLB Borrowings [Member] | $200 Debt Due 2025 [Member] | Variable-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 200,000 |
Short-term maturity year | 2025 |
FHLB Borrowings [Member] | $260 Debt Due 2026 [Member] | Variable-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 260,000 |
Short-term maturity year | 2026 |
FHLB Borrowings [Member] | FHLB Borrowings, 6 Fixed Rate Notes [Member] | Fixed-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Number of fixed rate short-term borrowings | item | 6 |
Short-term borrowings | $ 223,000 |
Short-term maturity year | 2018 |
FHLB Borrowings [Member] | FHLB Borrowings, 6 Variable Rate Notes [Member] | Variable-rate Term Notes [Member] |  |
Short-term Debt [Line Items] |  |
Number of variable rate short-term borrowings | loan | 6 |
Short-term borrowings | $ 910,000 |

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