Subsequent Events	12 Months Ended
Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 20 - Subsequent Events Acquisition of FCB Financial Holdings, Inc. Effective January 1, 2019, Synovus completed its acquisition of all of the outstanding stock of FCB Financial Holdings, Inc. (FCB), a bank holding company based in Weston, Florida. The fair value of the consideration transferred totaled approximately $1.60 billion. Effective January 1, 2019, Florida Community Bank merged into Synovus Bank. At the acquisition date, FCB had total loans of $9.42 billion, total deposits of $10.89 billion and operated 51 full service banking centers through its wholly-owned banking subsidiary, Florida Community Bank. With the addition of FCB, Synovus will become a top five regional bank by deposits in the Southeast region. The addition of FCB will elevate Synovus' growth profile through a deepened presence in high-growth Florida markets. Conversion of FCB systems is expected during the second quarter of 2019. As the acquisition of FCB was completed after December 31, 2018, Synovus' consolidated financial statements as of and for the years ended December 31, 2018 do not include amounts for FCB. Merger-related expenses totaling $10.1 million relating to this transaction were recorded during the year ended December 31, 2018. Given the timing of the closing of this transaction, Synovus is currently in the process of valuing the assets acquired and liabilities assumed in the business combination. As a result, we are not yet able to provide the amounts to be recognized as of the closing date for the major classes of assets acquired and liabilities assumed and other related disclosures. If the acquisition of FCB had been completed on January 1, 2018, unaudited pro forma total revenue, net of interest expense would have been approximately $1.9 billion for 2018, and unaudited pro forma net income available to common shareholders would have been approximately $613 million. The unaudited pro forma results include the impact of amortizing and accreting certain estimated purchase accounting adjustments such as intangible assets as well as fair value adjustments to loans, deposits, and long-term debt. Merger-related expenses that occurred at the effective time of the merger or subsequent to the merger are not reflected in the unaudited pro forma amounts. Cost savings are also not reflected in the unaudited pro forma amounts for the twelve months ended December 31, 2018. The pro forma information does not necessarily reflect the results of operations that would have occurred had Synovus merged with FCB at the beginning of 2018. Issuance of Subordinated Debt On February 7, 2019, Synovus completed a public offering of $300.0 million aggregate principal amount of 5.900% fixed-to-fixed rate subordinated notes due in 2029. Subject to any redemption prior to February 7, 2029, the notes will bear interest at the rate of 5.900% per annum for the first five years and, thereafter, at a fixed rate which will be 3.379% above the 5-Year Mid-Swap Rate as of the reset date. Interest on the notes will be payable semi-annually in arrears. The notes will mature on February 7, 2029.

Note 20 - Subsequent Events

Acquisition of FCB Financial Holdings, Inc.

Effective January 1, 2019, Synovus completed its acquisition of all of the outstanding stock of FCB Financial Holdings, Inc. (FCB), a bank holding company based in Weston, Florida. The fair value of the consideration transferred totaled approximately $1.60 billion. Effective January 1, 2019, Florida Community Bank merged into Synovus Bank. At the acquisition date, FCB had total loans of $9.42 billion, total deposits of $10.89 billion and operated 51 full service banking centers through its wholly-owned banking subsidiary, Florida Community Bank. With the addition of FCB, Synovus will become a top five regional bank by deposits in the Southeast region. The addition of FCB will elevate Synovus' growth profile through a deepened presence in high-growth Florida markets. Conversion of FCB systems is expected during the second quarter of 2019.

As the acquisition of FCB was completed after December 31, 2018, Synovus' consolidated financial statements as of and for the years ended December 31, 2018 do not include amounts for FCB. Merger-related expenses totaling $10.1 million relating to this transaction were recorded during the year ended December 31, 2018. Given the timing of the closing of this transaction, Synovus is currently in the process of valuing the assets acquired and liabilities assumed in the business combination. As a result, we are not yet able to provide the amounts to be recognized as of the closing date for the major classes of assets acquired and liabilities assumed and other related disclosures.

If the acquisition of FCB had been completed on January 1, 2018, unaudited pro forma total revenue, net of interest expense would have been approximately $1.9 billion for 2018, and unaudited pro forma net income available to common shareholders would have been approximately $613 million. The unaudited pro forma results include the impact of amortizing and accreting certain estimated purchase accounting adjustments such as intangible assets as well as fair value adjustments to loans, deposits, and long-term debt. Merger-related expenses that occurred at the effective time of the merger or subsequent to the merger are not reflected in the unaudited pro forma amounts. Cost savings are also not reflected in the unaudited pro forma amounts for the twelve months ended December 31, 2018. The pro forma information does not necessarily reflect the results of operations that would have occurred had Synovus merged with FCB at the beginning of 2018.

Issuance of Subordinated Debt

On February 7, 2019, Synovus completed a public offering of $300.0 million aggregate principal amount of 5.900% fixed-to-fixed rate subordinated notes due in 2029. Subject to any redemption prior to February 7, 2029, the notes will bear interest at the rate of 5.900% per annum for the first five years and, thereafter, at a fixed rate which will be 3.379% above the 5-Year Mid-Swap Rate as of the reset date. Interest on the notes will be payable semi-annually in arrears. The notes will mature on February 7, 2029.