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Investments (Narrative) (Details) shares in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
May 01, 2018 USD ($) | Dec. 31, 2018 USD ($) investment investments shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |
Investment in marketable equity securities |  |  | $ 92,599,000 | $ 0 |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | $ (50,051,000)
Investment securities available for sale transferred to held to maturity fair value, net of tax |  | $ 109,500,000 | (109,507,000) | 0 | $ 0 |
Other Comprehensive Income Loss Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity Arising During Period Net Of Tax |  | 84,000,000 | (71,149,000) | 0 | 0 |
Other Comprehensive Income Loss Reclassification Adjustment For Accretion On Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity Arising During Period Before Tax |  |  | (17,106,000) | 0 | $ 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1] |  | $ (23,667,000) | (3,419,000) |  |
Number of investments in continuous unrealized loss position for more than twelve months | investment |  |  | 221 |  |  |
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | investment |  |  | 2 |  |  |
Unrealized losses related to marketability of securities or issuers ability to honor redemption obligations |  |  | $ 0 |  |  |
Investment value deemed to be OTTI |  |  | 0 |  |  |
Investment securities, aggregate carrying value, pledged as collateral |  |  | $ 4,030,826,000 | 4,593,198,000 |  |
Visa Class B Common Stock |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Investment owned (in shares) | shares |  |  | 298 |  |  |
Investment owned, fair value |  |  | $ 0 |  |  |
Equity Securities |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Fair value of marketable equity securities |  |  |  | $ 105,208,000 |  |
Mortgage Backed Securities |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Investment securities available for sale transferred to held to maturity amortized cost |  | 2,490,000,000 |  |  |  |
Investment securities available for sale transferred to held to maturity fair value |  | $ 2,380,000,000 |  |  |  |
Number of investments in continuous unrealized loss position for more than twelve months | investments |  |  | 213 |  |  |
U. S. Treasury |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Number of investments in continuous unrealized loss position for more than twelve months | investments |  |  | 7 |  |  |
Corporate Bonds |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to on year | investments |  |  | 1 |  |  |
Financial Instruments ASU cumulative effect adjustment |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | $ 18,700,000
[1] | Amounts in parentheses indicate debits to profit/loss.

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