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Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term Funding [Abstract] |  |
Federal funds purchased | $ 20,720 | $ 141,950
Securities sold under agreements to repurchase | 183,013 | 182,865
Federal funds purchased and securities sold under agreements to repurchase | 203,733 | 324,815
Commercial paper | 52,791 | 67,467
Total short-term funding | 256,525 | 392,282
Long-term Funding |  |
Senior notes, at par | 250,000 | 250,000
Subordinated notes, at par | 250,000 | 250,000
Other long-term funding and capitalized costs | (2,381) | (2,718)
Total long-term funding | 497,619 | 497,282
TotalShortTermLongTermExcludingFHLB | 754,144 | 889,564
Advances from Federal Home Loan Banks [Abstract] |  |
ShortTermFHLBAdvances | 370,000 | 284,000
LongTermFHLBAdvances | 4,427,857 | 2,900,168
TotalFHLB_Advances | 4,797,857 | 3,184,168
Total short and long-term funding, excluding FHLB advances | $ 5,552,001 | $ 4,073,732

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