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Derivative Financial Instruments - Free-Standing (Details) $ in Thousands | 3 Months Ended | 12 Months Ended | 96 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2016 shares | Dec. 31, 2015 shares | Dec. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Jun. 28, 2018 | Dec. 31, 2017
Visa | Class B restricted shares |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Number of shares sold | shares |  |  | 274,000 | 0 |  |  |  |
Funding Swap (Visa Derivative) | Class B restricted shares |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Conversion rate |  |  |  |  |  |  | 1.6298 | 1.6483
Funding Swap (Visa Derivative) | Visa |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Estimated liability that was subsequently paid to the buyer |  |  |  |  |  | $ 700 |  |
Derivatives Not Designated as Hedging Instruments | Interest rate swaps |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Notional Amount | $ 2,334,559 |  |  |  | $ 2,269,247 |  |  |
Net interest expense on derivative | $ 0 | $ 200 |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Minimum |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 2.02% |  |  |  | 2.02% |  |  |
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Maximum |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 5.78% |  |  |  | 5.78% |  |  |
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Customer swap program |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  | $ 2,200,000 |  |  |
Upfront fees on the dealer swap | $ 800 | $ 3,200 |  |  |  |  |  |
Derivative asset value | 29,000 |  |  |  | 12,300 |  |  |
Derivative liability value | 1,900 |  |  |  | 11,200 |  |  |
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other assets |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Positive fair value, derivative asset | 29,034 |  |  |  | 12,305 |  |  |
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other liabilities |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Negative fair value, derivative liability | 1,897 |  |  |  | 12,007 |  |  |
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Notional Amount | 64,395 |  |  |  | 62,039 |  |  |
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Included in other liabilities |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |
Negative fair value, derivative liability | $ 1,839 |  |  |  | $ 2,607 |  |  |

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