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v3.20.2

Investments (Narrative) (Details) shares in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) investments investment shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) investments investment shares | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |
Stock issued by Federal Home Loan Bank | $ 45,400,000 |  | $ 45,400,000 |  |  | $ 43,000,000.0
Non-marketable equity securities | 13,100,000 |  | 13,100,000 |  |  | 12,500,000
Accrued Interest receivable excluded from estimate of credit losses | 21,300,000 |  | 21,300,000 |  |  |
Available for sale securities, realized gains | 13,800,000 |  | 34,200,000 |  |  |
Available for sale securities, realized loss | 0 | $ 0 | 679,000 | $ 0 |  |
Available for sale securities, realized gain (loss) | $ 13,752,000 | $ 5,719,000 | $ 33,547,000 | $ 5,719,000 | $ 5,700,000 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investment | 47 |  | 47 |  |  |
Unrealized losses related to marketability of securities or issuer's ability to honor redemption obligations | $ 0 |  | $ 0 |  |  |
Investment value deemed to be OTTI |  |  | 0 |  |  |
Investment securities, aggregate carrying value, pledged as collateral | 4,530,000,000 |  | 4,530,000,000 |  |  | $ 3,930,000,000
Debt Securities, Accrued Interest, WriteOff | 0 |  | 0 |  |  |
Held-to-maturity securities | 0 |  | 0 |  |  |
Past due securities | $ 0 |  | $ 0 |  |  |
Residential mortgage-backed securities |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to one year | investments | 45 |  | 45 |  |  |
Corporate Bonds |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to one year | investments | 2 |  | 2 |  |  |
Visa Class B Common Stock |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Investment owned (in shares) | shares | 354 |  | 354 |  |  |
Investment owned | $ 0 |  | $ 0 |  |  |

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