Acquisitions	12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]
Acquisition	Note 2 - Acquisitions Cabela's Transaction On September 25, 2017, Synovus' wholly owned subsidiary, Synovus Bank, completed the acquisition of certain assets and assumption of certain liabilities of WFB. Immediately following the closing of this transaction, Synovus Bank sold WFB’s credit card assets and related liabilities to Capital One Bank (USA), National Association, a bank subsidiary of Capital One Financial Corporation. Synovus retained WFB’s $1.10 billion brokered time deposits portfolio, which had a weighted average remaining maturity of 2.53 years and a weighted average rate of 1.83% as of September 25, 2017. The transaction was accounted for as an assumption of a liability (accounted for under the asset acquisition model). In accordance with ASC 820, Fair Value Measurements and Disclosures, the brokered time deposit portfolio was recorded at $1.10 billion, which was the amount of cash received for the deposits and represented the estimated fair value of the deposits at the transaction date. Additionally, Synovus received a $75.0 million transaction fee from Cabela’s Incorporated and Capital One, which was recognized into earnings on September 25, 2017 upon closing of the transaction, based on having achieved the recognition criteria outlined in SEC SAB Topic 13.A, Revenue Recognition. Acquisition of Global One On October 1, 2016, Synovus completed its acquisition of all of the outstanding stock of Global One. Under the terms of the merger agreement, Synovus acquired Global One for an up-front payment of $30 million, consisting of the issuance of 821 thousand shares of Synovus common stock valued at $26.6 million and $3.4 million in cash, with additional payments to Global One's former shareholders over a three to five year period based on earnings from the Global One business, as further discussed below. The acquisition of Global One constituted a business combination. Accordingly, the assets acquired and liabilities assumed were recorded at their estimated fair values on October 1, 2016. The determination of fair value required management to make estimates about discount rates, future expected earnings and cash flows, market conditions, future loan growth, and other future events that are highly subjective in nature and subject to change. Under the terms of the merger agreement, the purchase price includes additional annual payments ("Earnout Payments") to Global One's former shareholders over a three to five year period, with amounts based on a percentage of "Global One Earnings," as defined in the merger agreement. The Earnout Payments consist of shares of Synovus common stock as well as a smaller cash consideration component. The first and second annual Earnout Payments were made during November 2017 and November 2018, consisting of the issuance of 118 thousand and 199 thousand shares, respectively, of Synovus common stock valued at $5.5 million and $7.4 million, respectively, and $892 thousand and $1.2 million in cash, respectively. During 2018, Synovus recorded an $11.7 million increase to the earnout liability driven by increased earnings projections of Global One. The total fair value of the earnout liability at December 31, 2018 was $14.4 million based on the estimated fair value of the remaining Earnout Payments.

Note 2 - Acquisitions

Cabela's Transaction

On September 25, 2017, Synovus' wholly owned subsidiary, Synovus Bank, completed the acquisition of certain assets and assumption of certain liabilities of WFB. Immediately following the closing of this transaction, Synovus Bank sold WFB’s credit card assets and related liabilities to Capital One Bank (USA), National Association, a bank subsidiary of Capital One Financial Corporation.

Synovus retained WFB’s $1.10 billion brokered time deposits portfolio, which had a weighted average remaining maturity of 2.53 years and a weighted average rate of 1.83% as of September 25, 2017. The transaction was accounted for as an assumption of a liability (accounted for under the asset acquisition model). In accordance with ASC 820, Fair Value Measurements and Disclosures, the brokered time deposit portfolio was recorded at $1.10 billion, which was the amount of cash received for the deposits and represented the estimated fair value of the deposits at the transaction date. Additionally, Synovus received a $75.0 million transaction fee from Cabela’s Incorporated and Capital One, which was recognized into earnings on September 25, 2017 upon closing of the transaction, based on having achieved the recognition criteria outlined in SEC SAB Topic 13.A, Revenue Recognition.

Acquisition of Global One

On October 1, 2016, Synovus completed its acquisition of all of the outstanding stock of Global One. Under the terms of the merger agreement, Synovus acquired Global One for an up-front payment of $30 million, consisting of the issuance of 821 thousand shares of Synovus common stock valued at $26.6 million and $3.4 million in cash, with additional payments to Global One's former shareholders over a three to five year period based on earnings from the Global One business, as further discussed below.

The acquisition of Global One constituted a business combination. Accordingly, the assets acquired and liabilities assumed were recorded at their estimated fair values on October 1, 2016. The determination of fair value required management to make estimates about discount rates, future expected earnings and cash flows, market conditions, future loan growth, and other future events that are highly subjective in nature and subject to change.

Under the terms of the merger agreement, the purchase price includes additional annual payments ("Earnout Payments") to Global One's former shareholders over a three to five year period, with amounts based on a percentage of "Global One Earnings," as defined in the merger agreement. The Earnout Payments consist of shares of Synovus common stock as well as a smaller cash consideration component. The first and second annual Earnout Payments were made during November 2017 and November 2018, consisting of the issuance of 118 thousand and 199 thousand shares, respectively, of Synovus common stock valued at $5.5 million and $7.4 million, respectively, and $892 thousand and $1.2 million in cash, respectively. During 2018, Synovus recorded an $11.7 million increase to the earnout liability driven by increased earnings projections of Global One. The total fair value of the earnout liability at December 31, 2018 was $14.4 million based on the estimated fair value of the remaining Earnout Payments.