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Investment Securities - Visa Class B Restricted Shares (Details) $ in Thousands | 12 Months Ended | 96 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) shares | Dec. 31, 2008 USD ($) shares | Dec. 31, 2015 shares | Mar. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jul. 31, 2018 USD ($) | Jun. 28, 2018 | Dec. 31, 2017
Visa | Class B restricted shares |  |  |  |  |  |  |  |
Visa Class B Restricted Shares |  |  |  |  |  |  |  |
Historical cost included in the balance sheets |  | $ 0 |  |  |  |  |  |
Net realized gain related to the sale of stock | $ 22,700 |  |  |  |  |  |  |
Number of shares sold | shares | 274,000 |  | 0 |  |  |  |  |
Shares held | shares |  |  |  | 120,000 | 120,000 |  |  |
Cost basis |  |  |  | $ 0 | $ 0 |  |  |
Visa | Class B restricted shares |  |  |  |  |  |  |  |
Visa Class B Restricted Shares |  |  |  |  |  |  |  |
Stock received in initial public offering (in shares) | shares |  | 394,000 |  |  |  |  |  |
Funding Swap (Visa Derivative) | Class B restricted shares |  |  |  |  |  |  |  |
Visa Class B Restricted Shares |  |  |  |  |  |  |  |
Conversion rate |  |  |  |  |  |  | 1.6298 | 1.6483
Funding Swap (Visa Derivative) | Visa |  |  |  |  |  |  |  |
Visa Class B Restricted Shares |  |  |  |  |  |  |  |
Estimated liability that was subsequently paid to the buyer |  |  |  |  |  | $ 700 |  |

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