Visa Shares and Related Agreements	12 Months Ended
Dec. 31, 2017
Visa Shares and Litigation Expense [Abstract]
Visa Shares and Related Agreements	Note 18 - Visa Shares and Related Agreements Synovus is a member of the Visa USA network and received shares of Visa Class B common stock in exchange for its membership interest in Visa USA in conjunction with the Visa IPO in 2008. Visa members have indemnification obligations with respect to the Covered Litigation. Visa Class B shares are subject to certain restrictions until settlement of the Covered Litigation. As of December 31, 2017, all of the Covered Litigation had not been settled. Visa has established a litigation escrow to fund settlement of the Covered Litigation. The litigation escrow is funded by proceeds from Visa's conversion of Class B shares to Class A shares. In November 2009, Synovus sold its remaining Visa Class B shares to another Visa USA member financial institution. In conjunction with the sale, Synovus entered into a derivative contract with the purchaser which provides for settlements between the parties based upon a change in the ratio for conversion of Visa Class B shares to Visa Class A shares. As of December 31, 2017 and 2016, the fair value of the derivative contract was $4.3 million and $5.8 million, respectively. The fair value of the derivative contract is determined based on management's estimate of the timing and amount of the Covered Litigation settlement, and the resulting payments due to the counterparty under the terms of the contract. For the years ended December 31, 2016 and 2015, Synovus recognized fair value adjustments to the Visa derivative of $5.8 million and $1.5 million, respectively. No fair value adjustments were recognized during the year ended December 31, 2017. Management believes that the estimate of Synovus' exposure to the Visa indemnification and fees associated with the Visa derivative is adequate based on current information, including Visa's recent announcements and disclosures. However, future developments in the litigation could require potentially significant changes to Synovus' estimate.

Note 18 - Visa Shares and Related Agreements

Synovus is a member of the Visa USA network and received shares of Visa Class B common stock in exchange for its membership interest in Visa USA in conjunction with the Visa IPO in 2008. Visa members have indemnification obligations with respect to the Covered Litigation. Visa Class B shares are subject to certain restrictions until settlement of the Covered Litigation. As of December 31, 2017, all of the Covered Litigation had not been settled. Visa has established a litigation escrow to fund settlement of the Covered Litigation. The litigation escrow is funded by proceeds from Visa's conversion of Class B shares to Class A shares.

In November 2009, Synovus sold its remaining Visa Class B shares to another Visa USA member financial institution. In conjunction with the sale, Synovus entered into a derivative contract with the purchaser which provides for settlements between the parties based upon a change in the ratio for conversion of Visa Class B shares to Visa Class A shares. As of December 31, 2017 and 2016, the fair value of the derivative contract was $4.3 million and $5.8 million, respectively. The fair value of the derivative contract is determined based on management's estimate of the timing and amount of the Covered Litigation settlement, and the resulting payments due to the counterparty under the terms of the contract. For the years ended December 31, 2016 and 2015, Synovus recognized fair value adjustments to the Visa derivative of $5.8 million and $1.5 million, respectively. No fair value adjustments were recognized during the year ended December 31, 2017.

Management believes that the estimate of Synovus' exposure to the Visa indemnification and fees associated with the Visa derivative is adequate based on current information, including Visa's recent announcements and disclosures. However, future developments in the litigation could require potentially significant changes to Synovus' estimate.