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Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2014 | Jun. 30, 2018 | Dec. 31, 2017
Subordinated Borrowing [Line Items] |  |  |
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed |  | $ 279,000 |
Federal Home Loan Bank, Advances, Weighted Average Interest Rate |  | 1.97% | 1.26%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  | $ 4,797,857 | $ 3,184,168
FHLB Advances, Weighted Average Life |  | 1 year 4 months 24 days |
FHLB Put Contractual Maturity Weighted Average Life |  | 6 years 7 months 6 days |
Two Thousand Fourteen Senior Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
New Senior Debt Issued | $ 250,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |  |
Two Thousand Fourteen Subordinated Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Junior Subordinated Debentures Issued | $ 250,000 |  |
Debt Instrument, Term | 10 years |  |
Subordinated Borrowing, Interest Rate | 4.25% |  |
FHLB Maturity within One Year [Domain] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  | $ 2,632,613 | $ 2,434,000
FHLB, Increase in Advances [Domain] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  | $ 1,600,000 |

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- Definition Carrying value of securities purchased under agreements to resell and deposits paid for securities borrowed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.3) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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