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v3.19.1

Investments (Narrative) (Details) shares in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) investment investments shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2018 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Investment in marketable equity securities | $ 109,884,000 |  | $ 92,599,000 |
Investment securities available for sale | $ 4,589,800,000 |  | 4,557,110,000 |
Cumulative effect of new accounting principle in period of adoption |  |  |  | $ (50,051,000)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investment | 230 |  |  |
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | investment | 2 |  |  |
Unrealized losses related to marketability of securities or issuer's ability to honor redemption obligations | $ 0 |  |  |
Investment value deemed to be OTTI | 0 |  |  |
Investment securities, aggregate carrying value, pledged as collateral | 3,680,000,000 |  | 4,030,000,000 |
Mortgage Backed Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment securities available for sale | $ 2,895,944,000 |  | 2,909,339,000 |
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to one year | investments | 223 |  |  |
U. S. Treasury |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment securities available for sale | $ 1,197,042,000 |  | 1,247,710,000 |
Corporate Bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment securities available for sale | $ 142,162,000 |  | $ 139,101,000 |
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to one year | investments | 2 |  |  |
Visa Class B Common Stock |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment owned (in shares) | shares | 298 |  |  |
Investment owned, fair value | $ 0 |  |  |
U. S. Treasury |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investment | 5 |  |  |

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