Significant Accounting Policies (Policies)	9 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2014
Significant Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents consist of cash and due from banks. At September 30, 2014 and December 31, 2013, cash and cash equivalents included $91.3 million and $104.9 million, respectively, on deposit to meet Federal Reserve Bank requirements. At September 30, 2014 and December 31, 2013, $125 thousand and $375 thousand, respectively, of the due from banks balance was restricted as to withdrawal.
Short-term Investment	Short-term investments consist of interest bearing funds with the Federal Reserve Bank, interest earning deposits with banks, and Federal funds sold and securities purchased under resale agreements. Interest earning deposits with banks include $7.1 million and $11.1 million at September 30, 2014 and December 31, 2013, respectively, which is pledged as collateral in connection with certain letters of credit. Federal funds sold include $68.1 million at September 30, 2014 and $72.2 million at December 31, 2013, which are pledged to collateralize certain derivative instruments. Federal funds sold and securities purchased under resale agreements, and Federal funds purchased and securities sold under repurchase agreements, generally mature in one day.
Recently Adopted Accounting Standards Updates	Effective January 1, 2014, Synovus adopted the provisions of ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This ASU provides guidance on financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. Income tax accounting guidance did not explicitly address how to present unrecognized tax benefits when a company also has net operating losses or tax credit carryforwards. Previously, most companies presented these unrecognized benefits as a liability (i.e., gross presentation), but some presented the liability as a reduction of their net operating losses or tax credit carryforwards (i.e., net presentation). To address this diversity in practice, the FASB issued ASU 2013-11, requiring unrecognized tax benefits to be offset against a deferred tax asset for a net operating loss carryforward, similar tax loss, or tax credit carryforward except when either (1) a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available as of the reporting date under the governing tax law to settle taxes that would result from the disallowance of the tax position, or (2) the entity does not intend to use the deferred tax asset for this purpose (provided that the tax law permits a choice). If either of these conditions exists, an entity should present an unrecognized tax benefit in the financial statements as a liability and should not net the unrecognized tax benefit with a deferred tax asset. Synovus adopted the provisions of ASU 2013-11 effective January 1, 2014. However, because prior to adoption Synovus already presented its unrecognized tax benefits as a reduction of its net operating losses, adoption of ASU 2013-11 did not have a significant impact on its consolidated balance sheet.
Reclassifications	Prior periods' consolidated financial statements are reclassified whenever necessary to conform to the current periods' presentation.
Subsequent Events	Synovus has evaluated for consideration, or disclosure, all transactions, events, and circumstances, subsequent to the date of the consolidated balance sheet and through the date the accompanying unaudited interim consolidated financial statements were issued, and has reflected, or disclosed, those items deemed appropriate within the unaudited interim consolidated financial statements.

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

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- Definition

Disclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.

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