Synovus Financial (SNV) 10-Q 5 Nov 14 2014 Q3 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'SYNOVUS FINANCIAL CORP	'
Entity Central Index Key	'0000018349	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	136,571,459

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and cash equivalents	$386,402	$469,630
Interest bearing funds with Federal Reserve Bank	750,446	644,528
Interest earning deposits with banks	13,612	24,325
Federal funds sold and securities purchased under resale agreements	70,918	80,975
Trading account assets, at fair value	12,705	6,113
Mortgage loans held for sale, at fair value	72,333	45,384
Other loans held for sale	338	10,685
Investment securities available for sale, at fair value	3,050,257	3,199,358
Loans, net of deferred fees and costs	20,588,566	20,057,798
Allowance for loan losses	-269,376	-307,560
Loans, net	20,319,190	19,750,238
Premises and equipment, net	456,633	468,871
Goodwill	24,431	24,431
Other intangible assets, net	1,471	3,415
Other real estate	81,636	112,629
Deferred tax asset, net	656,151	744,646
Other assets	622,587	616,376
Total assets	26,519,110	26,201,604
LIABILITIES AND SHAREHOLDERS' EQUITY	'	'
Non-interest bearing deposits	5,813,809	5,642,751
Interest bearing deposits, excluding brokered deposits	13,609,038	14,140,037
Brokered deposits	1,566,934	1,094,002
Total deposits	20,989,781	20,876,790
Federal funds purchased and securities sold under repurchase agreements	107,160	148,132
Long-term debt	2,130,934	2,033,141
Other liabilities	214,690	194,556
Total liabilities	23,442,565	23,252,619
Shareholders' Equity:	'	'
Common stock - $1.00 par value. Authorized 342,857,143 shares; 139,877,971 issued at September 30, 2014 and 139,720,701 issued at December 31, 2013; 139,064,621 outstanding at September 30, 2014 and 138,907,351 outstanding at December 31, 2013	139,878	139,721
Additional paid-in capital	2,974,319	2,976,348
Treasury stock, at cost – 813,350 shares at September 30, 2014 and December 31, 2013	-114,176	-114,176
Accumulated other comprehensive loss, net	-24,827	-41,258
Accumulated deficit	-24,629	-137,512
Total shareholders' equity	3,076,545	2,948,985
Total liabilities and shareholders' equity	26,519,110	26,201,604
Series C Preferred Stock [Member]	'	'
Shareholders' Equity:	'	'
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at September 30, 2014 and December 31, 2013	$125,980	$125,862

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Common stock, par value (per share)	$1	$1
Common stock, shares authorized	342,857,143	342,857,143
Common stock, shares issued	139,877,971	139,720,701
Common stock, shares outstanding	139,064,621	138,907,351
Treasury stock, shares at cost	813,350	813,350
Series C Preferred Stock [Member]	'	'
Preferred stock, shares outstanding	5,200,000	5,200,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income:	'	'	'	'
Loans, including fees	$217,288	$217,982	$644,392	$650,192
Investment securities available for sale	14,029	13,584	43,775	37,302
Trading account assets	106	155	357	433
Mortgage loans held for sale	701	869	1,719	3,987
Federal Reserve Bank balances	562	814	1,561	2,498
Other earning assets	708	448	2,185	1,343
Total interest income	233,394	233,852	693,989	695,755
Interest expense:	'	'	'	'
Deposits	13,504	16,354	41,246	48,964
Federal funds purchased and securities sold under repurchase agreements	35	72	186	242
Long-term debt	13,592	13,456	40,728	40,688
Total interest expense	27,131	29,882	82,160	89,894
Net interest income	206,263	203,970	611,829	605,861
Provision for loan losses	3,843	6,761	25,638	55,534
Net interest income after provision for loan losses	202,420	197,209	586,191	550,327
Non-interest income:	'	'	'	'
Service charges on deposit accounts	20,159	19,426	58,610	58,142
Fiduciary and asset management fees	11,207	10,389	33,536	32,471
Brokerage revenue	7,281	6,636	20,201	21,231
Mortgage banking income	4,665	5,314	13,459	19,569
Bankcard fees	8,182	7,760	24,394	22,662
Investment securities gains, net	0	1,124	1,331	2,571
Other fee income	4,704	5,199	14,495	16,461
(Decrease) increase in fair value of private equity investments, net	-144	284	-513	-856
Gain on sale of Memphis branches, net	0	0	5,789	0
Other non-interest income	7,931	7,446	26,253	21,139
Total non-interest income	63,985	63,578	197,555	193,390
Non-interest expense:	'	'	'	'
Salaries and other personnel expense	93,870	92,794	279,855	276,190
Net occupancy and equipment expense	26,956	26,475	79,436	77,025
Third-party processing expense	10,044	10,151	29,604	30,446
FDIC insurance and other regulatory fees	8,013	7,639	25,781	24,059
Professional fees	2,526	11,410	18,427	28,922
Advertising expense	7,177	3,114	15,935	6,513
Foreclosed real estate expense, net	9,074	10,359	18,818	28,800
Losses (gains) on other loans held for sale, net	-176	408	2,050	487
Visa indemnification charges	1,979	0	2,731	801
Restructuring charges	809	687	17,101	7,295
Other operating expenses	33,477	24,291	70,377	70,261
Total non-interest expense	193,749	187,328	560,115	550,799
Income before income taxes	72,656	73,459	223,631	192,918
Income tax expense	25,868	27,765	81,554	72,114
Net income	46,788	45,694	142,077	120,804
Dividends and accretion of discount on preferred stock	2,559	8,506	7,678	38,100
Net income available to common shareholders	$44,229	$37,188	$134,399	$82,704
Net income per common share, basic	$0.32	$0.27	$0.97	$0.67
Net income per common share, diluted	$0.32	$0.27	$0.96	$0.62
Weighted average common shares outstanding, basic	139,043	136,671	138,989	123,652
Weighted average common shares outstanding, diluted	139,726	137,097	139,600	132,476

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income, Before-tax Amount	$72,656	$73,459	$223,631	$192,918
Net income, Tax (Expense) Benefit	-25,868	-27,765	-81,554	-72,114
Net income, Net of Tax Amount	46,788	45,694	142,077	120,804
Reclassification adjustment for losses realized in net income, Before-tax Amount	112	112	336	336
Reclassification adjustment for losses realized in net income, Tax (Expense) Benefit	-43	-43	-130	-131
Reclassification adjustment for losses realized in net income, Net of Tax Amount	69	69	206	205
Net unrealized gains/losses on investment securities available for sale: Before-tax Amount	'	'	'	'
Reclassification adjustment for net gains realized in net income, Before-tax Amount	0	-1,124	-1,331	-2,571
Net unrealized gains (losses) arising during the period, Before-tax Amount	-18,173	6,849	27,467	-53,166
Net unrealized gains (losses), Before-tax Amount	-18,173	5,725	26,136	-55,737
Net unrealized gains/losses on investment securities available for sale: Tax (Expense) Benefit	'	'	'	'
Reclassification adjustment for net gains realized in net income, Tax (Expense) Benefit	0	433	513	990
Net unrealized gains (losses) arising during the period, Tax (Expense) Benefit	6,993	-2,637	-10,579	20,468
Net unrealized gains (losses), Tax (Expense) Benefit	6,993	-2,204	-10,066	21,458
Net unrealized gains/losses on investment securities available for sale: Net of Tax Amount	'	'	'	'
Reclassification adjustment for net gains realized in net income, Net of Tax Amount	0	-691	-818	-1,581
Net unrealized gains (losses) arising during the period, Net of Tax Amount	-11,180	4,212	16,888	-32,698
Net unrealized gains (losses), Net of Tax Amount	-11,180	3,521	16,070	-34,279
Post-retirement unfunded health benefit: Before-tax Amount	'	'	'	'
Reclassification adjustment for (gains) losses realized in net income, Before-tax Amount	0	-72	-144	-98
Actuarial gains arising during the period, Before-tax Amount	'	'	395	830
Net unrealized gains, Before-tax Amount	'	'	251	732
Post-retirement unfunded health benefit: Tax (Expense) Benefit	'	'	'	'
Reclassification adjustment for (gains) losses realized in net income, Tax (Expense) Benefit	0	28	56	38
Actuarial gains arising during the period, Tax (Expense) Benefit	'	'	-152	-311
Net unrealized gains, Tax (Expense) Benefit	'	'	-96	-273
Post-retirement unfunded health benefit: Net of Tax Amount	'	'	'	'
Reclassification adjustment for (gains) losses realized in net income, Net of Tax Amount	0	-44	-88	-60
Actuarial gains arising during the period, Net of Tax Amount	'	'	243	519
Net unrealized gains, Net of Tax Amount	'	'	155	459
Other comprehensive (loss) income, Before-tax Amount	-18,061	5,765	26,723	-54,669
Other comprehensive (loss) income, Tax (Expense) Benefit	6,950	-2,219	-10,292	21,054
Other comprehensive (loss) income, Net of Tax Amount	-11,111	3,546	16,431	-33,615
Comprehensive income, Net of Tax Amount	$35,677	$49,240	$158,508	$87,189

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (USD $)

Total

Series A Preferred Stock [Member]

Series C Preferred Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Common Stock [Member]

Additional Paid-In Capital [Member]

Additional Paid-In Capital [Member]

Additional Paid-In Capital [Member]

Treasury Stock [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Accumulated Deficit [Member]

In Thousands

Series A Preferred Stock [Member]

Series C Preferred Stock [Member]

Series A Preferred Stock [Member]

Series C Preferred Stock [Member]

Balance at Dec. 31, 2012

$3,569,431

'

'

$957,327

'

$113,182

$2,868,965

'

'

($114,176)

$4,101

($259,968)

Net income

120,804

'

'

'

'

'

'

'

'

'

'

120,804

Other comprehensive income (loss), net of income taxes

-33,615

'

'

'

'

'

'

'

'

'

-33,615

'

Cash dividends declared on Common Stock - $0.21 per share

-26,703

'

'

'

'

'

'

'

'

'

'

-26,703

Cash dividends paid on Preferred Stock

'

-33,741

'

'

'

'

'

-33,741

'

'

'

'

Accretion of discount on Series A Preferred Stock

'

'

'

10,543

'

'

'

-10,543

'

'

'

'

Redemption of Series A Preferred Stock

'

-967,870

'

-967,870

'

'

'

'

'

'

'

'

Settlement of prepaid common stock purchase contracts

122,848

'

'

'

'

17,550

-17,550

'

'

'

'

'

Issuance of stock, net of issuance costs

174,764

'

125,400

'

125,400

8,553

166,211

'

'

'

'

'

Restricted share unit activity

-3,541

'

'

'

'

372

-3,413

'

'

'

'

-500

Stock options exercised

789

'

'

'

'

47

742

'

'

'

'

'

Share-based compensation tax benefit

371

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation expense

5,771

'

'

'

'

'

5,771

'

'

'

'

'

Balance at Sep. 30, 2013

2,931,860

'

'

0

125,400

139,704

2,976,813

'

'

-114,176

-29,514

-166,367

Balance at Dec. 31, 2013

2,948,985

'

'

'

125,862

139,721

2,976,348

'

'

-114,176

-41,258

-137,512

Net income

142,077

'

'

'

'

'

'

'

'

'

'

142,077

Other comprehensive income (loss), net of income taxes

16,431

'

'

'

'

'

'

'

'

'

16,431

'

Cash dividends declared on Common Stock - $0.21 per share

-29,194

'

'

'

'

'

'

'

'

'

'

-29,194

Cash dividends paid on Preferred Stock

'

'

-7,678

'

'

'

'

'

-7,678

'

'

'

Settlement of prepaid common stock purchase contracts

0

'

'

'

'

'

'

'

'

'

'

'

Issuance of stock, net of issuance costs

'

'

118

'

118

'

'

'

'

'

'

'

Restricted share unit activity

-468

'

'

'

'

41

-509

'

'

'

'

'

Stock options exercised

1,985

'

'

'

'

116

1,869

'

'

'

'

'

Share-based compensation tax deficiency

-3,164

'

'

'

'

'

-3,164

'

'

'

'

'

Share-based compensation expense

7,453

'

'

'

'

'

7,453

'

'

'

'

'

Balance at Sep. 30, 2014

$3,076,545

'

'

'

$125,980

$139,878

$2,974,319

'

'

($114,176)

($24,827)

($24,629)

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Statement of Stockholders' Equity [Abstract]	'	'
Cash dividends declared on common stock, per share	$0.21	$0.21

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating Activities	'	'
Net income	$142,077	$120,804
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Provision for loan losses	25,638	55,534
Depreciation, amortization, and accretion, net	39,524	46,513
Deferred income tax expense	74,940	64,101
Decrease in interest receivable	1,459	8,229
Decrease in interest payable	-1,575	-3,207
Increase in trading account assets	-6,592	-6,261
Originations of mortgage loans held for sale	-579,139	-749,437
Proceeds from sales of mortgage loans held for sale	561,796	893,348
Gains on sales of mortgage loans held for sale	-8,971	-10,789
(Increase) decrease in fair value of mortgage loans held for sale	-969	3,838
Decrease in other assets	1,392	36,138
Increase (decrease) in accrued salaries and benefits	6,772	-4,584
Increase in other liabilities	14,934	333
Investment securities gains, net	-1,331	-2,571
Losses on sales of other loans held for sale, net	2,050	487
Losses and write-downs on other real estate, net	16,734	22,714
Share-based compensation expense	7,453	5,771
Write-downs on other assets held for sale	7,608	0
Gain on sale of Memphis branches, net	-5,789	0
Gain on sale of branch property	-3,116	0
Net cash provided by operating activities	294,895	480,961
Investing Activities	'	'
Net cash (used) received in dispositions/acquisitions	-90,571	56,328
Net decrease in interest earning deposits with banks	10,713	9,382
Net decrease in federal funds sold and securities purchased under resale agreements	10,057	33,340
Net (increase) decrease in interest bearing funds with Federal Reserve Bank	-105,918	531,955
Proceeds from maturities and principal collections of investment securities available for sale	417,704	584,810
Proceeds from sales of investment securities available for sale	20,815	403,792
Purchases of investment securities available for sale	-277,375	-1,197,122
Proceeds from sales of loans	44,001	75,359
Proceeds from sale of other real estate	49,754	77,168
Principal repayments by borrowers on other loans held for sale	770	3,966
Net increase in loans	-754,930	-423,252
Purchases of premises and equipment	-36,059	-24,971
Proceeds from disposals of premises and equipment	4,838	3,172
Proceeds from sale of other assets held for sale	507	1,085
Net cash (used in) provided by investing activities	-705,694	135,012
Financing Activities	'	'
Net increase (decrease) in demand and savings deposits	8,677	-281,267
Net increase in certificates of deposit	295,687	141,252
Net decrease in federal funds purchased and securities sold under repurchase agreements	-40,972	-6,630
Principal repayments on long-term debt	-605	-301,431
Proceeds from issuance of long-term debt	99,938	462,500
Dividends paid to common shareholders	-29,194	-26,703
Dividends paid to preferred shareholders	-7,678	-33,741
Stock options exercised	1,985	789
Proceeds from issuance of Series C Preferred Stock	0	125,400
Redemption of Series A Preferred Stock	0	-967,870
Proceeds from issuance of common stock	0	174,764
Excess tax benefit from share-based compensation	201	569
Restricted stock activity	-468	-3,541
Net cash provided by (used in) financing activities	327,571	-715,909
Decrease in cash and cash equivalents	-83,228	-99,936
Cash and cash equivalents at beginning of period	469,630	614,630
Cash and cash equivalents at end of period	386,402	514,694
Supplemental Cash Flow Information	'	'
Income tax payments, net	4,693	1,669
Interest paid	83,861	85,332
Non-cash Investing Activities:	'	'
Mortgage loans held for sale transferred to loans at fair value	334	14,471
Premises and equipment transferred to other assets held for sale	16,613	490
Loans foreclosed and transferred to other real estate	35,495	72,854
Loans transferred to other loans held for sale at fair value	36,736	117,806
Other loans held for sale transferred to loans at fair value	0	1,235
Other loans held for sale foreclosed and transferred to other real estate at fair value	0	3,246
Settlement of prepaid common stock purchase contracts	0	122,848
Securities purchased during the period but settled after period-end	0	35,160
Dispositions/Acquisitions:	'	'
Fair value of non-cash assets (sold) acquired	-100,982	536
Fair value of liabilities (sold) assumed	($191,553)	$56,864

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Significant Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	Note 1 - Significant Accounting Policies
	Business Operations
	The accompanying unaudited interim consolidated financial statements of Synovus include the accounts of the Parent Company and its consolidated subsidiaries. Synovus provides integrated financial services, including commercial and retail banking, financial management, insurance, and mortgage services to its customers through locally-branded divisions of its wholly-owned subsidiary bank, Synovus Bank, in offices located throughout Georgia, Alabama, South Carolina, Florida, and Tennessee.
	In addition to our banking operations, we also provide various other financial services to our customers through direct and indirect wholly-owned non-bank subsidiaries, including: Synovus Securities, Inc., headquartered in Columbus, Georgia, which specializes in professional portfolio management for fixed-income securities, investment banking, the execution of securities transactions as a broker/dealer and the provision of individual investment advice on equity and other securities; Synovus Trust Company, N.A., headquartered in Columbus, Georgia, which provides trust, asset management and financial planning services; and Synovus Mortgage Corp., headquartered in Birmingham, Alabama, which offers mortgage services.
	Basis of Presentation
	The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the instructions to the SEC Form 10-Q and Article 10 of Regulation S-X; therefore, they do not include all information and footnotes necessary for a fair presentation of financial position, results of operations, comprehensive income, and cash flows in conformity with GAAP. All adjustments consisting of normally recurring accruals that, in the opinion of management, are necessary for a fair presentation of the consolidated financial position and results of operations for the periods covered by this Report have been included. The accompanying unaudited interim consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes appearing in Synovus' 2013 Form 10-K. There have been no significant changes to the accounting policies as disclosed in Synovus' 2013 Form 10-K.
	In preparing the unaudited interim consolidated financial statements in accordance with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the respective consolidated balance sheets and the reported amounts of revenues and expenses for the periods presented. Actual results could differ significantly from those estimates.
	Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses; the valuation of other real estate; the fair value of investment securities; the fair value of private equity investments; the valuation of deferred tax assets; and contingent liabilities related to legal matters.
	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 Investments
	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.

Share_Repurchase_Program

Share Repurchase Program	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Share Repurchase	'
	Note 2 - Share Repurchase Program
	On October 21, 2014, Synovus announced a common stock repurchase program of up to $250 million which will expire on October 23, 2015.

Reverse_Stock_Split_and_Increa

Reverse Stock Split and Increase in Number of Authorized Common Shares	9 Months Ended
	Sep. 30, 2014
Reverse Stock Split and Increase in Number of Authorized Common Shares [Abstract]	'
Reverse Stock Split and Increase in Number of Authorized Common Shares	'
	Note 3 - Reverse Stock Split and Increase in Number of Authorized Common Shares
	On April 24, 2014, at Synovus' 2014 Annual Shareholders' Meeting ("Annual Meeting"), Synovus’ shareholders approved a proposal authorizing Synovus’ Board of Directors to effect a one-for-seven reverse stock split of Synovus’ common stock. Following the Annual Meeting, Synovus’ Board of Directors authorized the one-for-seven reverse stock split.  The reverse stock split became effective on May 16, 2014, and Synovus' shares of common stock began trading on a post-split basis on the New York Stock Exchange (NYSE) at the opening of trading on May 19, 2014. All prior periods presented in this Report have been adjusted to reflect the one-for-seven reverse stock split. Financial information updated by this capital change includes earnings per common share, dividends per common share, stock price per common share, weighted average common shares, outstanding common shares, treasury shares, common stock, additional paid-in capital, and share-based compensation.
	Additionally, on April 24, 2014, Synovus’ shareholders also approved an amendment to Synovus’ articles of incorporation to increase the number of authorized shares of Synovus’ common stock from 1.2 billion shares to 2.4 billion shares. Synovus effected the increase in the number of authorized shares on April 24, 2014. Upon the reverse stock split effective date, the number of Synovus’ authorized shares of common stock were proportionately reduced from 2.4 billion shares to 342.9 million shares.

Sale_of_Branches

Sale of Branches	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Sale of Branches	'
	Note 4 - Sale of Branches
	On January 17, 2014, Synovus completed the sale of certain loans, premises, deposits, and other assets and liabilities of the Memphis, Tennessee branches of Trust One Bank, a division of Synovus Bank.  The sale included $89.6 million in total loans and $191.3 million in total deposits.   Results for the nine months ended September 30, 2014 reflect a pre-tax gain, net of associated costs, of $5.8 million relating to this transaction.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2014
Investments [Abstract]	'
Investment Securities	'
	Note 5 - Investment Securities
	The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities available for sale at September 30, 2014 and December 31, 2013 are summarized below.
			September 30, 2014
	(in thousands)		Amortized Cost(1)				Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	42,627			41			—			42,668
	U.S. Government agency securities		26,435				1,034			—			27,469
	Securities issued by U.S. Government sponsored enterprises		81,549				778			—			82,327
	Mortgage-backed securities issued by U.S. Government agencies		176,254				2,074			(933	)		177,395
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,323,561				13,516			(20,469	)		2,316,608
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		371,656				4,052			(2,249	)		373,459
	State and municipal securities		5,099				204			(2	)		5,301
	Equity securities		3,228				3,129			—			6,357
	Other investments		19,110				—			(437	)		18,673
	Total investment securities available for sale		$	3,049,519			24,828			(24,090	)		3,050,257
			31-Dec-13
	(in thousands)		Amortized Cost(1)				Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	17,791			—			—			17,791
	U.S. Government agency securities		33,480				1,161			—			34,641
	Securities issued by U.S. Government sponsored enterprises		112,305				1,440			—			113,745
	Mortgage-backed securities issued by U.S. Government agencies		196,521				2,257			(3,661	)		195,117
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,443,282				9,718			(31,640	)		2,421,360
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		406,717				698			(8,875	)		398,540
	State and municipal securities		6,723				168			(2	)		6,889
	Equity securities		3,856				3,728			—			7,584
	Other investments		4,074				—			(383	)		3,691
	Total investment securities available for sale		$	3,224,749			19,170			(44,561	)		3,199,358
	(1)	Amortized cost is adjusted for other-than-temporary impairment charges in 2014 and 2013, which have been recognized in the consolidated statements of income in the applicable year, and were considered inconsequential.
	At September 30, 2014 and December 31, 2013, investment securities with a carrying value of $1.93 billion and $2.33 billion respectively, were pledged to secure certain deposits and securities sold under repurchase agreements as required by law and contractual agreements.
	Synovus has reviewed investment securities that are in an unrealized loss position as of September 30, 2014 and December 31, 2013 for OTTI and does not consider any securities in an unrealized loss position to be other-than-temporarily impaired. If Synovus intended to sell a security in an unrealized loss position, the entire unrealized loss would be reflected in income. Synovus does not intend to sell investment securities in an unrealized loss position prior to the recovery of the unrealized loss, which may be until maturity, and has the ability and intent to hold those securities for that period of time. Additionally, Synovus is not currently aware of any circumstances which will require it to sell any of the securities that are in an unrealized loss position.
	Declines in the fair value of available for sale securities below their cost that are deemed to have OTTI are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. Currently, unrealized losses on debt securities are attributable to increases in interest rates on comparable securities from the date of purchase. Synovus regularly evaluates its investment securities portfolio to ensure that there are no conditions that would indicate that unrealized losses represent OTTI. These factors include the length of time the security has been in a loss position, the extent that the fair value is below amortized cost, and the credit standing of the issuer. As of September 30, 2014, Synovus had ten investment securities in a loss position for less than twelve months and fifty investment securities in a loss position for twelve months or longer.
	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2014 and December 31, 2013, are presented below.
		September 30, 2014
		Less than 12 Months							12 Months or Longer						Total
	(in thousands)	Fair				Gross Unrealized			Fair			Gross Unrealized			Fair	Gross Unrealized
		Value				Losses			Value			Losses			Value	Losses
	U.S. Treasury securities	$	—			—			—			—			—	—
	U.S. Government agency securities	—				—			—			—			—	—
	Securities issued by U.S. Government sponsored enterprises	—				—			—			—			—	—
	Mortgage-backed securities issued by U.S. Government agencies	9,678				14			29,955			919			39,633	933
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	220,542				562			1,099,220			19,907			1,319,762	20,469
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				—			122,239			2,249			122,239	2,249
	State and municipal securities	—				—			43			2			43	2
	Equity securities	—				—			—			—			—	—
	Other investments	16,889				221			1,784			216			18,673	437
	Total	$	247,109			797			1,253,241			23,293			1,500,350	24,090
		December 31, 2013
		Less than 12 Months							12 Months or Longer						Total
	(in thousands)	Fair				Gross Unrealized			Fair			Gross Unrealized			Fair	Gross Unrealized
		Value				Losses			Value			Losses			Value	Losses
	U.S. Treasury securities	$	—			—			—			—			—	—
	U.S. Government agency securities	—				—			—			—			—	—
	Securities issued by U.S. Government sponsored enterprises	—				—			—			—			—	—
	Mortgage-backed securities issued by U.S. Government agencies	121,607				3,363			2,951			298			124,558	3,661
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	1,885,521				31,640			—			—			1,885,521	31,640
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	282,898				8,875			—			—			282,898	8,875
	State and municipal securities	—				—			40			2			40	2
	Equity securities	—				—			—			—			—	—
	Other investments	1,969				105			1,722			278			3,691	383
	Total	$	2,291,995			43,983			4,713			578			2,296,708	44,561
	The amortized cost and fair value by contractual maturity of investment securities available for sale at September 30, 2014 are shown below. The expected life of mortgage-backed securities or CMOs may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. For purposes of the maturity table, mortgage-backed securities and CMOs, which are not due at a single maturity date, have been classified based on the final contractual maturity date.
		Distribution of Maturities at September 30, 2014
	(in thousands)	Within One				1 to 5			5 to 10			More Than			No Stated	Total
		Year				Years			Years			10 Years			Maturity
Amortized Cost
U.S. Treasury securities	$	17,793			24,834			—			—			—	42,627
U.S. Government agency securities	78				12,577			13,780			—			—	26,435
Securities issued by U.S. Government sponsored enterprises	—				81,549			—			—			—	81,549
Mortgage-backed securities issued by U.S. Government agencies	5				1			—			176,248			—	176,254
Mortgage-backed securities issued by U.S. Government sponsored enterprises	431				1,605			1,926,129			395,396			—	2,323,561
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				—			—			371,656			—	371,656
State and municipal securities	100				1,971			289			2,739			—	5,099
Equity securities	—				—			—			—			3,228	3,228
Other investments	—				—			—			17,000			2,110	19,110
Total amortized cost	$	18,407			122,537			1,940,198			963,039			5,338	3,049,519
Fair Value
U.S. Treasury securities	$	17,793			24,875			—			—			—	42,668
U.S. Government agency securities	80				13,014			14,375			—			—	27,469
Securities issued by U.S. Government sponsored enterprises	—				82,327			—			—			—	82,327
Mortgage-backed securities issued by U.S. Government agencies	5				1			—			177,389			—	177,395
Mortgage-backed securities issued by U.S. Government sponsored enterprises	456				1,707			1,912,088			402,357			—	2,316,608
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				—			—			373,459			—	373,459
State and municipal securities	100				2,009			305			2,887			—	5,301
Equity securities	—				—			—			—			6,357	6,357
Other investments	—				—			—			16,666			2,007	18,673
Total fair value	$	18,434			123,933			1,926,768			972,758			8,364	3,050,257
Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the nine and three months ended September 30, 2014 and 2013 are presented below. Other-than-temporary impairment charges of $88 thousand are included in gross realized losses for the nine months ended September 30, 2014. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale.
		Nine Months Ended September 30,							Three Months Ended September 30,
(in thousands)		2014				2013			2014			2013
Proceeds from sales of investment securities available for sale		$	20,815			$403,792			—			56,406
Gross realized gains		1,419				3,185			—			1,150
Gross realized losses		(88		)		(614	)		—			(26	)
Investment securities gains, net		$	1,331			2,571			—			1,124

Restructuring_Charges

Restructuring Charges	9 Months Ended
	Sep. 30, 2014
Restructuring Charges [Abstract]	'
Restructuring Charges	'
	Note 6 - Restructuring Charges
	For the nine and three months ended September 30, 2014 and 2013 total restructuring charges are as follows:
		Nine Months Ended September 30,				Three Months Ended September 30,
	(in thousands)	2014		2013		2014		2013
	Severance charges	$	8,046	7,311		$	—	701
	Asset impairment charges	7,374		—		36		—
	Professional fees and other charges	1,681		(16	)	773		(14	)
	Total restructuring charges	$	17,101	7,295		$	809	687
	In January 2014, Synovus announced the planned implementation during 2014 of new expense savings initiatives. The initiatives include planned workforce reductions as well as planned reductions in occupancy expenses. Synovus began to implement these initiatives during the first quarter of 2014, undertaking the first targeted staff reductions. As a result of these actions, Synovus recorded aggregate restructuring charges of $8.6 million during the three months ended March 31, 2014, consisting primarily of $8.0 million in severance charges related to employees identified for involuntary termination. These termination benefits are provided under an ongoing benefit arrangement as defined in ASC 712, Compensation-Nonretirement Postemployment Benefits; accordingly, the charges were recorded pursuant to the liability recognition criteria of ASC 712. Additionally, during the second quarter of 2014, upon management's decision to close 13 branches across the five-state footprint during the fourth quarter of 2014, Synovus recorded asset impairment charges of $7.4 million. During the third quarter of 2014, Synovus recorded restructuring charges of $809 thousand primarily for professional fees related to organizational restructuring. Restructuring charges for the fourth quarter of 2014 are expected to include approximately $6 million in charges related to operating lease exit costs associated with the branch closings which were completed in October 2014.
	Severance charges recorded during the nine months ended September 30, 2013 relate to involuntary terminations in connection with previously announced efficiency initiatives. These termination benefits were provided under a one-time benefit arrangement as defined in ASC 420, Exit or Disposal Costs or Obligations; accordingly, the charges were recorded pursuant to the liability recognition criteria of ASC 420.
	At September 30, 2014, the liability for restructuring activities was $5.1 million, and consisted primarily of involuntary termination benefits.

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2014
Allowance for Loan and Lease Losses, Adjustments, Net [Abstract]	'
Loans and Allowance for Loan Losses	'
	Note 7 - Loans and Allowance for Loan Losses
	The following is a summary of current, accruing past due, and non-accrual loans by portfolio class as of September 30, 2014 and December 31, 2013.
	Current, Accruing Past Due, and Non-accrual Loans
		September 30, 2014
	(in thousands)	Current				Accruing 30-89 Days Past Due			Accruing 90 Days or Greater Past Due			Total Accruing Past Due			Non-accrual			Total
	Investment properties	$	4,978,360			1,565			142			1,707			38,979			5,019,046
	1-4 family properties	1,098,574				9,759			103			9,862			29,118			1,137,554
	Land acquisition	546,490				2,085			76			2,161			40,128			588,779
	Total commercial real estate	6,623,424				13,409			321			13,730			108,225			6,745,379
	Commercial, financial and agricultural	5,935,845				13,659			545			14,204			53,360			6,003,409
	Owner-occupied	3,970,755				15,871			230			16,101			26,810			4,013,666
	Total commercial and industrial	9,906,600				29,530			775			30,305			80,170			10,017,075
	Home equity lines	1,658,917				9,656			524			10,180			16,875			1,685,972
	Consumer mortgages	1,574,526				11,615			1,004			12,619			34,759			1,621,904
	Credit cards	250,768				1,688			1,397			3,085			—			253,853
	Other retail	288,086				2,747			46			2,793			2,353			293,232
	Total retail	3,772,297				25,706			2,971			28,677			53,987			3,854,961
	Total loans	$	20,302,321			68,645			4,067			72,712			242,382			20,617,415	(1	)
		December 31, 2013
	(in thousands)	Current				Accruing 30-89 Days Past Due			Accruing 90 Days or Greater Past Due			Total Accruing Past Due			Non-accrual			Total
	Investment properties	$	4,546,439			3,552			40			3,592			66,454			4,616,485
	1-4 family properties	1,144,447				6,267			527			6,794			33,819			1,185,060
	Land acquisition	549,936				1,100			300			1,400			154,095			705,431
	Total commercial real estate	6,240,822				10,919			867			11,786			254,368			6,506,976
	Commercial, financial and agricultural	5,812,490				18,985			813			19,798			62,977			5,895,265
	Owner-occupied	3,985,705				11,113			129			11,242			39,239			4,036,186
	Total commercial and industrial	9,798,195				30,098			942			31,040			102,216			9,931,451
	Home equity lines	1,564,578				4,919			136			5,055			17,908			1,587,541
	Consumer mortgages	1,460,219				18,068			1,011			19,079			39,770			1,519,068
	Credit cards	253,422				1,917			1,507			3,424			—			256,846
	Other retail	280,524				2,190			26			2,216			2,038			284,778
	Total retail	3,558,743				27,094			2,680			29,774			59,716			3,648,233
	Total loans	$	19,597,760			68,111			4,489			72,600			416,300			20,086,660	(2	)
	(1)Total before net deferred fees and costs of $28.8 million.
	(2)Total before net deferred fees and costs of $28.9 million.
	The credit quality of the loan portfolio is summarized no less frequently than quarterly using the standard asset classification system utilized by the federal banking agencies. These classifications are divided into three groups – Not Criticized (Pass), Special Mention, and Classified or Adverse rating (Substandard, Doubtful, and Loss) and are defined as follows:
	Pass - loans which are well protected by the current net worth and paying capacity of the obligor (or guarantors, if any) or by the fair value, less cost to acquire and sell in a timely manner, of any underlying collateral.
	Special Mention - loans which have potential weaknesses that deserve management's close attention. These loans are not adversely classified and do not expose an institution to sufficient risk to warrant an adverse classification.
	Substandard - loans which are inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. Loans with this classification are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected.
	Doubtful - loans which have all the weaknesses inherent in loans classified as Substandard with the added characteristic that the weaknesses make collection or liquidation in full highly questionable and improbable on the basis of currently known facts, conditions, and values.
	Loss - loans which are considered by management to be uncollectible and of such little value that their continuance on the institution's books as an asset, without establishment of a specific valuation allowance or charge-off is not warranted.
	In the following tables, retail loans and small business loans are generally assigned a risk grade similar to the classifications described above; however, upon reaching 90 days and 120 days past due, they are generally downgraded to Substandard and Loss, respectively, in accordance with the FFIEC Uniform Retail Credit Classification and Account Management Policy. Additionally, in accordance with the Interagency Supervisory Guidance on Allowance for Loan and Lease Losses Estimation Practices for Loans and Lines of Credit Secured by Junior Liens on 1-4 Family Residential Properties, the risk grade classifications of retail loans (home equity lines and consumer mortgages) secured by junior liens on 1-4 family residential properties also consider available information on the payment status of the associated senior lien with other financial institutions.
	Loan Portfolio Credit Exposure by Risk Grade
		September 30, 2014
	(in thousands)	Pass				Special			Substandard(1)			Doubtful(2)			Loss			Total
						Mention
	Investment properties	$	4,687,315			197,501			134,230			—			—			5,019,046
	1-4 family properties	925,346				99,686			104,994			7,528			—			1,137,554
	Land acquisition	460,829				55,707			71,336			907			—			588,779
	Total commercial real estate	6,073,490				352,894			310,560			8,435			—			6,745,379
	Commercial, financial and agricultural	5,667,272				174,559			151,871			8,562			1,145		(3)	6,003,409
	Owner-occupied	3,728,191				124,702			159,502			839			432		(3)	4,013,666
	Total commercial and industrial	9,395,463				299,261			311,373			9,401			1,577			10,017,075
	Home equity lines	1,661,751				—			19,239			2,090			2,892		(3)	1,685,972
	Consumer mortgages	1,577,632				—			42,323			1,610			339		(3)	1,621,904
	Credit cards	252,510				—			539			—			804		(4)	253,853
	Other retail	289,713				—			3,383			32			104		(3)	293,232
	Total retail	3,781,606				—			65,484			3,732			4,139			3,854,961
	Total loans	$	19,250,559			652,155			687,417			21,568			5,716			20,617,415	(5	)
		31-Dec-13
	(in thousands)	Pass				Special			Substandard(1)			Doubtful(2)			Loss			Total
						Mention
	Investment properties	$	4,197,368			249,890			167,503			1,724			—			4,616,485
1-4 family properties	920,392				126,715			129,599			8,062			292		(3)	1,185,060
Land acquisition	422,054				94,316			186,514			2,547			—			705,431
Total commercial real estate	5,539,814				470,921			483,616			12,333			292			6,506,976
Commercial, financial and agricultural	5,451,369				224,620			208,422			10,764			90		(3)	5,895,265
Owner-occupied	3,714,400				155,097			164,560			2,129			—			4,036,186
Total commercial and industrial	9,165,769				379,717			372,982			12,893			90			9,931,451
Home equity lines	1,559,272				—			25,177			1,314			1,778		(3)	1,587,541
Consumer mortgages	1,475,928				—			40,368			2,485			287		(3)	1,519,068
Credit cards	255,339				—			541			—			966		(4)	256,846
Other retail	281,179				—			3,400			75			124		(3)	284,778
Total retail	3,571,718				—			69,486			3,874			3,155			3,648,233
Total loans	$	18,277,301			850,638			926,084			29,100			3,537			20,086,660	(6	)
(1) Includes $215.1 million and $383.7 million of non-accrual Substandard loans at September 30, 2014 and December 31, 2013, respectively.
(2) The loans within this risk grade are on non-accrual status. Commercial loans generally have an allowance for loan losses in accordance with ASC 310, and retail loans generally have an allowance for loan losses equal to 50% of the loan amount.
(3) The loans within this risk grade are on non-accrual status and have an allowance for loan losses equal to the full loan amount.
(4) Represent amounts that were 120 days past due. These credits are downgraded to the Loss category with an allowance for loan losses equal to the full loan amount and are generally charged off upon reaching 181 days past due in accordance with the FFIEC Uniform Retail Credit Classification and Account Management Policy.
(5)Total before net deferred fees and costs of $28.8 million.
(6)Total before net deferred fees and costs of $28.9 million.
The following table details the changes in the allowance for loan losses by loan segment for the nine months ended September 30, 2014 and 2013.
Allowance for Loan Losses and Recorded Investment in Loans
	As Of and For The Nine Months Ended September 30, 2014
(in thousands)	Commercial Real Estate				Commercial & Industrial			Retail			Unallocated			Total
Allowance for loan losses:
Beginning balance	$	127,646			115,435			41,479			23,000			307,560
Allowance for loan losses of sold branches	(281		)		(398	)		(340	)		—			(1,019	)
Charge-offs	(41,139		)		(26,896	)		(19,082	)		—			(87,117	)
Recoveries	8,318				9,562			6,434			—			24,314
Provision (credit) for loan losses	7,445				27,140			14,053			(23,000	)		25,638
Ending balance	$	101,989			124,843			42,544			—			269,376
Ending balance: individually evaluated for impairment	22,107				15,863			1,195			—			39,165
Ending balance: collectively evaluated for impairment	$	79,882			108,980			41,349			—			230,211
Loans:
Ending balance: total loans(1)	$	6,745,379			10,017,075			3,854,961			—			20,617,415
Ending balance: individually evaluated for impairment	317,011				172,860			47,669			—			537,540
Ending balance: collectively evaluated for impairment	$	6,428,368			9,844,215			3,807,292			—			20,079,875
	As Of and For The Nine Months Ended September 30, 2013
(in thousands)	Commercial Real Estate				Commercial & Industrial			Retail			Unallocated			Total
Allowance for loan losses:
Beginning balance	$	167,926			138,495			38,984			28,000			373,405
Charge-offs	(73,825		)		(44,104	)		(27,359	)		—			(145,288	)
Recoveries	11,861				17,266			5,834			—			34,961
Provision (credit) for loan losses	31,221				7,462			21,851			(5,000	)		55,534
Ending balance	$	137,183			119,119			39,310			23,000			318,612
Ending balance: individually evaluated for impairment	50,737				25,194			2,120			—			78,051
Ending balance: collectively evaluated for impairment	$	86,446			93,925			37,190			23,000			240,561
Loans:
Ending balance: total loans(2)	$	6,458,518			9,705,425			3,572,669			—			19,736,612
Ending balance: individually evaluated for impairment	569,128				259,764			53,061			—			881,953
Ending balance: collectively evaluated for impairment	$	5,889,390			9,445,661			3,519,608			—			18,854,659
(1)Total before net deferred fees and costs of $28.8 million.
(2)Total before net deferred fees and costs of $25.0 million.
The following table details the changes in the allowance for loan losses by loan segment for the three months ended September 30, 2014 and 2013.
Allowance for Loan Losses and Recorded Investment in Loans
	As Of and For The Three Months Ended September 30, 2014
(in thousands)	Commercial Real Estate				Commercial & Industrial				Retail			Unallocated			Total
Allowance for loan losses:
Beginning balance	$	104,394			130,814				42,575			—			277,783
Charge-offs	(5,233		)		(11,306		)		(6,222	)		—			(22,761	)
Recoveries	3,099				5,257				2,155			—			10,511
Provision for loan losses	(271		)		78				4,036			—			3,843
Ending balance	$	101,989			124,843				42,544			—			269,376
Ending balance: individually evaluated for impairment	22,107				15,863				1,195			—			39,165
Ending balance: collectively evaluated for impairment	$	79,882			108,980				41,349			—			230,211
Loans:
Ending balance: total loans(1)	$	6,745,379			10,017,075				3,854,961			—			20,617,415
Ending balance: individually evaluated for impairment	317,011				172,860				47,669			—			537,540
Ending balance: collectively evaluated for impairment	$	6,428,368			9,844,215				3,807,292			—			20,079,875
	As Of and For The Three Months Ended September 30, 2013
(in thousands)	Commercial Real Estate				Commercial & Industrial				Retail			Unallocated			Total
Allowance for loan losses:
Beginning balance	$	138,329			133,190				40,361			23,000			334,880
Charge-offs	(9,474		)		(13,871		)		(6,908	)		—			(30,253	)
Recoveries	2,766				2,152				2,306			—			7,224
Provision (credit) for loan losses	5,562				(2,352		)		3,551			—			6,761
Ending balance	$	137,183			$	119,119			39,310			23,000			318,612
Ending balance: individually evaluated for impairment	50,737				25,194				2,120			—			78,051
Ending balance: collectively evaluated for impairment	$	86,446			93,925				37,190			23,000			240,561
Loans:
Ending balance: total loans(2)	$	6,458,518			9,705,425				3,572,669			—			19,736,612
Ending balance: individually evaluated for impairment	569,128				259,764				53,061			—			881,953
Ending balance: collectively evaluated for impairment	$	5,889,390			9,445,661				3,519,608			—			18,854,659
(1)Total before net deferred fees and costs of $28.8 million.
(2)Total before net deferred fees and costs of $25.0 million.
During the first quarter of 2014, Synovus designated $23.0 million of allowance for loan losses that was included in the unallocated component of the allowance for loan losses at December 31, 2013 to the allowance for loan losses allocated to the respective loan segments.  The allocation of the allowance for loan losses to the loan segments related to the qualitative factors evaluated at December 31, 2013 on a total loan portfolio basis and included in the unallocated component of the allowance for loan losses at December 31, 2013.   These qualitative factors consider the inherent risk of loss relating to the following:
•	changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses
•	changes in the volume and severity of past due loans, the volume of non-accrual loans, and the volume and severity of adversely classified or grade loans
•	experience, ability, and depth of lending management, loan review personnel, and other relevant staff
•	changes in the quality of the loan review function
•	national and local economic trends and conditions
•	changes in the value of underlying collateral for collateral-dependent loans
•	changes in the nature and volume of the loan portfolio
•	effects of changes in credit concentrations
•	model uncertainty
Management determined that, prospectively, the assessment of these qualitative factors for each loan segment would improve the overall level of precision of the allowance for loan loss estimation process.  The designation of this component of the unallocated allowance to the allocated allowance did not result in a change to the total allowance for loan losses or provision expense for the first quarter of 2014. The allowance for loan losses continues to consist of an allocated component (which includes the qualitative factors noted above as well as the qualitative factors disclosed in Synovus' 2013 Form 10-K) and an unallocated component. Beginning March 31, 2014, the unallocated component relates to risk elements, if any, which are not already included in the allocated allowance.
The tables below summarize impaired loans (including accruing TDRs) as of September 30, 2014 and December 31, 2013.
Impaired Loans (including accruing TDRs)
	September 30, 2014										Nine Months Ended						Three Months Ended September 30, 2014
											30-Sep-14
(in thousands)	Recorded Investment				Unpaid Principal Balance			Related Allowance			Average Recorded Investment			Interest Income Recognized			Average Recorded Investment		Interest Income Recognized
With no related allowance recorded
Investment properties	$	33,849			46,096			—			24,949			—			33,167		—
1-4 family properties	4,386				12,251			—			5,984			—			4,151		—
Land acquisition	29,501				76,068			—			31,187			—			29,584		—
Total commercial real estate	67,736				134,415			—			62,120			—			66,902		—
Commercial, financial and agricultural	5,705				12,109			—			9,917			—			6,785		—
Owner-occupied	15,300				17,512			—			21,024			—			17,942		—
Total commercial and industrial	21,005				29,621			—			30,941			—			24,727		—
Home equity lines	—				—			—			—			—			—		—
Consumer mortgages	995				2,065			—			1,471			—			1,869		—
Credit cards	—				—			—			—			—			—		—
Other retail	—				—			—			—			—			—		—
Total retail	995				2,065			—			1,471			—			1,869		—
Total impaired loans with no	$	89,736			166,101			—			94,532			—			93,498		—
related allowance recorded
With allowance recorded
Investment properties	117,707				119,560			6,621			141,128			3,034			118,729		961
1-4 family properties	83,797				84,588			10,694			99,038			2,209			87,829		613
Land acquisition	47,771				47,914			4,792			102,880			1,264			48,499		418
Total commercial real estate	249,275				252,062			22,107			343,046			6,507			255,057		1,992
Commercial, financial and agricultural	81,036				85,771			12,532			97,143			1,877			82,271		553
Owner-occupied	70,819				70,842			3,331			83,392			2,029			80,653		601
Total commercial and industrial	151,855				156,613			15,863			180,535			3,906			162,924		1,154
Home equity lines	3,822				3,822			68			3,253			71			3,809		40
Consumer mortgages	37,591				37,591			1,029			40,582			999			39,217		457
Credit cards	—				—			—			—			—			—		—
Other retail	5,261				5,261			98			4,892			228			5,171		88
Total retail	46,674				46,674			1,195			48,727			1,298			48,197		585
Total impaired loans with	$	447,804			455,349			39,165			572,308			11,711			466,178		3,731
allowance recorded
Total impaired loans
Investment properties	$	151,556			165,656			6,621			166,077			3,034			151,896		961
1-4 family properties	88,183				96,839			10,694			105,022			2,209			91,980		613
Land acquisition	77,272				123,982			4,792			134,067			1,264			78,083		418
Total commercial real estate	317,011				386,477			22,107			405,166			6,507			321,959		1,992
Commercial, financial and agricultural	86,741				97,880			12,532			107,060			1,877			89,056		553
Owner-occupied	86,119				88,354			3,331			104,416			2,029			98,595		601
Total commercial and industrial	172,860				186,234			15,863			211,476			3,906			187,651		1,154
Home equity lines	3,822				3,822			68			3,253			71			3,809		40
Consumer mortgages	38,586				39,656			1,029			42,053			999			41,086		457
Credit cards	—				—			—			—			—			—		—
Other retail	5,261				5,261			98			4,892			228			5,171		88
Total retail	47,669				48,739			1,195			50,198			1,298			50,066		585
Total impaired loans	$	537,540			621,450			39,165			666,840			11,711			559,676		3,731
Impaired Loans (including accruing TDRs)
	December 31, 2013										Year Ended December 31, 2013
(in thousands)	Recorded Investment				Unpaid Principal Balance			Related Allowance			Average Recorded Investment			Interest Income Recognized
With no related allowance recorded
Investment properties	$	14,218			15,820			—			18,046			—
1-4 family properties	9,679				29,741			—			23,879			—
Land acquisition	30,595				78,470			—			41,007			—
Total commercial real estate	54,492				124,031			—			82,932			—
Commercial, financial and agricultural	13,490				22,312			—			15,355			—
Owner-occupied	24,839				32,626			—			22,472			—
Total commercial and industrial	38,329				54,938			—			37,827			—
Home equity lines	—				—			—			33			—
Consumer mortgages	1,180				2,840			—			1,487			—
Credit cards	—				—			—			—			—
Other retail	—				—			—			4			—
Total retail	1,180				2,840			—			1,524			—
Total impaired loans with no	$	94,001			181,809			—			122,283			—
related allowance recorded
With allowance recorded
Investment properties	$	186,058			193,765			8,863			227,073			5,062
1-4 family properties	115,151				117,498			11,135			115,629			3,464
Land acquisition	183,029				202,048			26,789			191,807			2,931
Total commercial real estate	484,238				513,311			46,787			534,509			11,457
Commercial, financial and agricultural	115,532				120,290			15,559			128,680			3,630
Owner-occupied	89,001				94,869			4,459			107,949			3,656
Total commercial and industrial	204,533				215,159			20,018			236,629			7,286
Home equity lines	2,750				2,750			116			4,668			176
Consumer mortgages	44,019				44,019			967			48,674			1,910
Credit cards	—				—			—			—			—
Other retail	7,013				7,013			109			5,555			285
Total retail	53,782				53,782			1,192			58,897			2,371
Total impaired loans with	$	742,553			782,252			67,997			830,035			21,114
allowance recorded
Total impaired loans
Investment properties	$	200,276			209,585			8,863			245,119			5,062
1-4 family properties	124,830				147,239			11,135			139,508			3,464
Land acquisition	213,624				280,518			26,789			232,814			2,931
Total commercial real estate	538,730				637,342			46,787			617,441			11,457
Commercial, financial and agricultural	129,022				142,602			15,559			144,035			3,630
Owner-occupied	113,840				127,495			4,459			130,421			3,656
Total commercial and industrial	242,862				270,097			20,018			274,456			7,286
Home equity lines	2,750				2,750			116			4,701			176
Consumer mortgages	45,199				46,859			967			50,161			1,910
Credit cards	—				—			—			—			—
Other retail	7,013				7,013			109			5,559			285
Total retail	54,962				56,622			1,192			60,421			2,371
Total impaired loans	$	836,554			964,061			67,997			952,318			21,114
The average recorded investment in impaired loans was $666.8 million and $559.7 million for the nine and three months ended September 30, 2014, respectively. Excluding accruing TDRs, there was no interest income recognized for the investment in impaired loans for the nine and three months ended September 30, 2014 and 2013. Interest income recognized for accruing TDRs was $11.7 million and $3.7 million, respectively, for the nine and three months ended September 30, 2014 and $16.1 million and $5.2 million, respectively, for the nine and three months ended September 30, 2013 . At September 30, 2014 and December 31, 2013, all impaired loans other than $408.7 million and $574.2 million, respectively, of accruing TDRs, were on non-accrual status.
Concessions provided in a TDR are primarily in the form of providing a below market interest rate given the borrower's credit risk, a period of time generally less than one year with a reduction of required principal and/or interest payments (e.g., interest only for a period of time), or extension of the maturity of the loan generally for less than one year. Insignificant periods of reduction of principal and/or interest payments, or one time deferrals of 3 months or less, are generally not considered to be financial concessions.
The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the nine and three months ended September 30, 2014 and 2013 that were reported as accruing or non-accruing TDRs.
TDRs by Concession Type
	Nine Months Ended September 30, 2014
(in thousands, except contract data)	Number of Contracts			Principal Forgiveness				Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
Investment properties	14			$	—			8,423			5,598			14,021
1-4 family properties	36			—				2,390			3,859			6,249
Land acquisition	15			2,338				4,721			2,688			9,747
Total commercial real estate	65			2,338				15,534			12,145			30,017
Commercial, financial and agricultural	68			60				7,639			16,977			24,676
Owner-occupied	14			—				22,178			14,392			36,570
Total commercial and industrial	82			60				29,818			31,369			61,247
Home equity lines	11			—				1,163			451			1,614
Consumer mortgages	13			—				2,296			315			2,611
Credit cards	—			—				—			—			—
Other retail	17			—				543			385			928
Total retail	41			—				4,002			1,151			5,153
Total TDRs	188			$	2,398			49,354			44,665			96,417		(1	)
	Three Months Ended September 30, 2014
(in thousands, except contract data)	Number of Contracts			Principal Forgiveness				Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
Investment properties	4			$	—			875			3,899			4,774
1-4 family properties	7			—				879			203			1,082
Land acquisition	3			2,338				204			646			3,188
Total commercial real estate	14			2,338				1,958			4,748			9,044
Commercial, financial and agricultural	28			60				3,098			5,280			8,438
Owner-occupied	2			—				2,703			130			2,833
Total commercial and industrial	30			60				5,802			5,410			11,272
Home equity lines	5			—				435			—			435
Consumer mortgages	5			—				543			212			755
Credit cards	—			—				—						—
Other retail	7			—				101			150			251
Total retail	17			—				1,079			362			1,441
Total TDRs	61			$	2,398			8,839			10,520			21,757		(2	)
(1) Net charge-offs of $163 thousand were recorded during the nine months ended September 30, 2014 upon restructuring of these loans.
(2) Net charge-offs of $163 thousand were recorded during the three months ended September 30, 2014 upon restructuring of these loans.
TDRs by Concession Type
	Nine Months Ended September 30, 2013
(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
Investment properties	44			—			121,263			4,372			125,635
1-4 family properties	99			424			28,863			8,629			37,916
Land acquisition	26			74			113,627			9,763			123,464
Total commercial real estate	169			498			263,753			22,764			287,015
Commercial, financial and agricultural	85			183			21,600			12,675			34,458
Owner-occupied	51			—			21,571			22,935			44,506
Total commercial and industrial	136			183			43,171			35,610			78,964
Home equity lines	1			—			—			80			80
Consumer mortgages	123			—			10,230			4,004			14,234
Credit cards	—			—			—			—			—
Other retail	56			—			879			1,424			2,303
Total retail	180			—			11,109			5,508			16,617
Total TDRs	485			681			318,033			63,882			382,596		(1	)
	Three Months Ended September 30, 2013
(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
Investment properties	13			—			74,111			—			74,111
1-4 family properties	41			—			4,832			2,133			6,965
Land acquisition	10			—			108,295			2,532			110,827
Total commercial real estate	64			—			187,238			4,665			191,903
Commercial, financial and agricultural	16			—			3,152			2,737			5,889
Owner-occupied	12			—			5,575			7,940			13,515
Total commercial and industrial	28			—			8,727			10,677			19,404
Home equity lines	—			—			—			—			—
Consumer mortgages	39			—			3,106			966			4,072
Credit cards	—			—			—			—			—
Other retail	18			—			419			396			815
Total retail	57			—			3,525			1,362			4,887
Total TDRs	149			—			199,490			16,704			216,194		(2	)
(1) Net charge-offs of $199 thousand were recorded during the nine months ended September 30, 2013 upon restructuring of these loans.
(2) Net charge-offs of $146 thousand were recorded during the three months ended September 30, 2013 upon restructuring of these loans.
The following table presents TDRs that defaulted in the periods indicated and which were modified or renewed in a TDR within 12 months of the default date.
Troubled Debt Restructurings Entered Into That Subsequently Defaulted* During
	Nine Months Ended September 30, 2014							Three Months Ended September 30, 2014
(in thousands, except contract data)	Number of			Recorded				Number of			Recorded
	Contracts			Investment				Contracts			Investment
Investment properties	1			$	186			—			$	—
1-4 family properties	3			1,018				—			—
Land acquisition	1			428				—			—
Total commercial real estate	5			1,632				—			—
Commercial, financial and agricultural	4			1,559				2			181
Owner-occupied	—			—				—			—
Total commercial and industrial	4			1,559				2			181
Home equity lines	—			—				—			—
Consumer mortgages	3			206				2			136
Credit cards	—			—				—			—
Other retail	—			—				—			—
Total retail	3			206				2			136
Total TDRs	12			$	3,397			4			$	317
* Default is defined as the earlier of the troubled debt restructuring being placed on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments.
Troubled Debt Restructurings Entered Into That Subsequently Defaulted* During
	Nine Months Ended September 30, 2013							Three Months Ended September 30, 2013
(in thousands, except contract data)	Number of			Recorded				Number of			Recorded
	Contracts			Investment				Contracts			Investment
Investment properties	2			$	4,519			—			$	—
1-4 family properties	9			12,374				1			1,620
Land acquisition	1			126				—			—
Total commercial real estate	12			17,019				1			1,620
Commercial, financial and agricultural	3			409				—			—
Owner-occupied	2			924				—			—
Total commercial and industrial	5			1,333				—			—
Home equity lines	1			98				1			98
Consumer mortgages	15			1,195				2			217
Credit cards	—			—				—			—
Other retail	1			195				—			—
Total retail	17			1,488				3			315
Total TDRs	34			$	19,840			4			$	1,935
* Default is defined as the earlier of the troubled debt restructuring being placed on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments.
If, at the time a loan was designated as a TDR, the loan was not already impaired, the measurement of impairment that resulted from the TDR designation changes from a general pool-level reserve to a specific loan measurement of impairment in accordance with ASC 310-10-35. Generally, the change in the allowance for loan losses resulting from such TDR designation is not significant. At September 30, 2014, the allowance for loan losses allocated to accruing TDRs totaling $408.7 million was $22.7 million compared to accruing TDRs of $556.4 million with an allocated allowance for loan losses of $27.7 million at December 31, 2013. Non-accrual, non-homogeneous loans (commercial-type impaired loans greater than $1 million) that are designated as TDRs, are individually measured for the amount of impairment, if any, both before and after the TDR designation.

Other_Real_Estate

Other Real Estate	9 Months Ended
	Sep. 30, 2014
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'
Other Real Estate	'
	Note 8 - Other Real Estate
	ORE consists of properties obtained through a foreclosure proceeding or through an in-substance foreclosure in satisfaction of loans. In accordance with provisions of ASC 310-10-35 regarding subsequent measurement of loans for impairment and ASC 310-40-15 regarding accounting for troubled debt restructurings by a creditor, a loan is classified as an in-substance foreclosure when Synovus has taken possession of the collateral regardless of whether formal foreclosure proceedings have taken place.
	At foreclosure, ORE is recorded at the lower of cost or fair value less the estimated cost to sell, which establishes a new cost basis. Subsequent to foreclosure, ORE is evaluated quarterly and reported at fair value less estimated costs to sell, not to exceed the new cost basis, determined on the basis of current appraisals, comparable sales, and other estimates of fair value obtained principally from independent sources, adjusted for estimated selling costs. Management also considers other factors or recent developments such as changes in absorption rates or market conditions from the time of valuation and anticipated sales values considering management’s plans for disposition, which could result in an adjustment to lower the collateral value estimates indicated in the appraisals. At the time of foreclosure or initial possession of collateral, any excess of the loan balance over the fair value of the real estate held as collateral, less costs to sell, is recorded as a charge against the allowance for loan losses. Revenue and expenses from ORE operations as well as gains or losses on sales are recorded as foreclosed real estate expense, net, a component of non-interest expense on the consolidated statements of income. Subsequent declines in fair value are recorded on a property-by-property basis through use of a valuation allowance within other real estate on the consolidated balances sheets and valuation adjustment account in foreclosed real estate expense, net, a component of non-interest expense on the consolidated statements of income.
	The carrying value of ORE was $81.6 million and $112.6 million at September 30, 2014 and December 31, 2013, respectively. During the nine months ended September 30, 2014 and 2013, $35.5 million and $76.2 million, respectively, of loans and other loans held for sale were foreclosed and transferred to other real estate at fair value less costs to sell. During the nine months ended September 30, 2014 and 2013, Synovus recognized foreclosed real estate expense, net, of $18.8 million and $28.8 million, respectively. These expenses included write-downs for declines in fair value of ORE subsequent to the date of foreclosure and net realized losses resulting from sales transactions totaling $16.7 million and $22.7 million for the nine months ended September 30, 2014 and 2013, respectively.

Other_Comprehensive_Income_Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Other Comprehensive Income (Loss)	'
	Note 9 - Other Comprehensive Income (Loss)
	The following table illustrates activity within the balances in accumulated other comprehensive income (loss) by component, and is shown for the nine and three months ended September 30, 2014 and 2013.
	Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)
	(in thousands)	Net unrealized gains (losses) on cash flow hedges				Net unrealized gains (losses) on investment securities available for sale		Post-retirement unfunded health benefit		Total
	Balance as of December 31, 2013	$	(13,099	)		(28,936	)	777		(41,258	)
	Other comprehensive income before reclassifications	—				16,888		243		17,131
	Amounts reclassified from accumulated other comprehensive income (loss)	206				(818	)	(88	)	(700	)
	Net current period other comprehensive income (loss)	206				16,070		155		16,431
	Balance as of September 30, 2014	$	(12,893	)		(12,866	)	932		(24,827	)
	Balance as of July 1, 2014	$	(12,962	)		(1,686	)	932		(13,716	)
	Other comprehensive income before reclassifications	—				(11,180	)	—		(11,180	)
	Amounts reclassified from accumulated other comprehensive income (loss)	69				—		—		69
	Net current period other comprehensive income (loss)	69				(11,180	)	—		(11,111	)
	Balance as of September 30, 2014	$	(12,893	)		(12,866	)	932		(24,827	)
	Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)
	(in thousands)	Net unrealized gains (losses) on cash flow hedges				Net unrealized gains (losses) on investment securities available for sale		Post-retirement unfunded health benefit		Total
	Balance as of December 31, 2012	$	(13,373	)		17,111		363		4,101
	Other comprehensive income (loss) before reclassifications	—				(32,698	)	519		(32,179	)
	Amounts reclassified from accumulated other comprehensive income (loss)	205				(1,581	)	(60	)	(1,436	)
	Net current period other comprehensive income (loss)	205				(34,279	)	459		(33,615	)
	Balance as of September 30, 2013	$	(13,168	)		(17,168	)	822		(29,514	)
	Balance as of July 1, 2013	$	(13,237	)		(20,689	)	866		(33,060	)
	Other comprehensive income (loss) before reclassifications	—				4,212		—		4,212
	Amounts reclassified from accumulated other comprehensive income (loss)	69				(691	)	(44	)	(666	)
	Net current period other comprehensive income (loss)	69				3,521		(44	)	3,546
	Balance as of September 30, 2013	$	(13,168	)		(17,168	)	822		(29,514	)
	In accordance with ASC 740-20-45-11(b), a deferred tax asset valuation allowance associated with unrealized gains and losses not recognized in income is charged directly to other comprehensive income (loss). Thus, during the years 2010 and 2011, Synovus recorded a deferred tax asset valuation allowance associated with unrealized gains and losses not recognized in income directly to other comprehensive income (loss) by applying the portfolio approach for allocation of the valuation allowance. Synovus has consistently applied the portfolio approach which treats derivative financial instruments, equity securities, and debt securities as a single portfolio. As of September 30, 2014, the ending balance in net unrealized gains (losses) on cash flow hedges and net unrealized gains (losses) on investment securities available for sale includes unrealized losses of $12.1 million and $13.3 million, respectively, related to the residual tax effects remaining in OCI due to the previously established deferred tax asset valuation allowance. Under the portfolio approach, these unrealized losses are realized at the time the entire portfolio is sold or disposed.
	The following table illustrates activity within the reclassifications out of accumulated other comprehensive income (loss), for the nine and three months ended September 30, 2014 and 2013.
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	For the Nine Months Ended September 30, 2014
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(336	)		Interest expense
			130				Income tax (expense) benefit
			$	(206	)		Reclassifications, net of income taxes
	Net unrealized gains (losses) on investment securities available for sale:
	Realized gain on sale of securities		$	1,331			Investment securities gains, net
			(513		)		Income tax (expense) benefit
			$	818			Reclassifications, net of income taxes
	Post-retirement unfunded health benefit:
	Amortization of actuarial gains		$	144			Salaries and other personnel expense
			(56		)		Income tax (expense) benefit
			$	88			Reclassifications, net of income taxes
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	For the Three Months Ended September 30, 2014
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(112	)		Interest expense
			43				Income tax (expense) benefit
			$	(69	)		Reclassifications, net of income taxes
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	For the Nine Months Ended September 30, 2013
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(336	)		Interest expense
			131				Income tax (expense) benefit
			$	(205	)		Reclassifications, net of income taxes
	Net unrealized gains (losses) on investment securities available for sale:
	Realized gain on sale of securities		$	2,571			Investment securities gains, net
			(990		)		Income tax (expense) benefit
			$	1,581			Reclassifications, net of income taxes
	Post-retirement unfunded health benefit:
	Amortization of actuarial gains		$	98			Salaries and other personnel expense
		(38		)		Income tax (expense) benefit
		$	60			Reclassifications, net of income taxes
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
For the Three Months Ended September 30, 2013
Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
Net unrealized gains (losses) on cash flow hedges:
Amortization of deferred losses		$	(112	)		Interest expense
		43				Income tax (expense) benefit
		$	(69	)		Reclassifications, net of income taxes
Net unrealized gains (losses) on investment securities available for sale:
Realized gain on sale of securities		$	1,124			Investment securities gains, net
		(433		)		Income tax (expense) benefit
		$	691			Reclassifications, net of income taxes
Post-retirement unfunded health benefit:
Amortization of actuarial gains		$	72			Salaries and other personnel expense
		(28		)		Income tax (expense) benefit
		$	44			Reclassifications, net of income taxes

Fair_Value_Accounting

Fair Value Accounting	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Accounting	'
	Note 10 - Fair Value Accounting
	Synovus carries various assets and liabilities at fair value based on the fair value accounting guidance under ASC 820 and ASC 825. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an “exit price”) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.
	Fair Value Hierarchy
	Synovus determines the fair value of its financial instruments based on the fair value hierarchy established under ASC 820-10, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the financial instrument's fair value measurement in its entirety. There are three levels of inputs that may be used to measure fair value. The three levels of inputs of the valuation hierarchy are defined below:
	Level 1	Quoted prices (unadjusted) in active markets for identical assets and liabilities for the instrument or security to be valued. Level 1 assets include marketable equity securities as well as U.S. Treasury securities that are highly liquid and are actively traded in over-the-counter markets.
	Level 2	Observable inputs other than Level 1 quoted prices, such as quoted prices for similar assets and liabilities in active markets, quoted prices in markets that are not active or model-based valuation techniques for which all significant assumptions are derived principally from or corroborated by observable market data. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose value is determined by using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. U.S. Government sponsored agency securities, mortgage-backed securities issued by U.S. Government sponsored enterprises and agencies, obligations of states and municipalities, CMOs issued by U.S. Government sponsored enterprises, and mortgage loans held-for-sale are generally included in this category. Certain private equity investments that invest in publicly traded companies are also considered Level 2 assets.
	Level 3	Unobservable inputs that are supported by little, if any, market activity for the asset or liability. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow models and similar techniques, and may also include the use of market prices of assets or liabilities that are not directly comparable to the subject asset or liability. These methods of valuation may result in a significant portion of the fair value being derived from unobservable assumptions that reflect Synovus' own estimates for assumptions that market participants would use in pricing the asset or liability. This category primarily includes collateral-dependent impaired loans, other real estate, and certain private equity investments.
	See Note 16 "Fair Value Accounting" to the consolidated financial statements of Synovus' 2013 Form 10-K for a description of valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis.
	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	The following table presents all financial instruments measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013, according to the valuation hierarchy included in ASC 820-10. For equity and debt securities, class was determined based on the nature and risks of the investments.
		September 30, 2014
	(in thousands)	Level 1				Level 2			Level 3		Total Assets and Liabilities at Fair Value
	Assets
	Trading securities:
	Mortgage-backed securities issued by U.S. Government agencies	$	—			3,502			—		3,502
	Collateralized mortgage obligations issued by	—				3,677			—		3,677
	U.S. Government sponsored enterprises
	State and municipal securities	—				—			—		—
	All other mortgage-backed	—				4,174			—		4,174
	securities
	Other investments	97				1,255			—		1,352
	Total trading securities	$	97			12,608			—		12,705
	Mortgage loans held for sale	—				72,333			—		72,333
	Investment securities available for sale:
	U.S. Treasury securities	42,668				—			—		42,668
	U.S. Government agency securities	—				27,469			—		27,469
	Securities issued by U.S. Government sponsored enterprises	—				82,327			—		82,327
	Mortgage-backed securities issued by U.S. Government agencies	—				177,395			—		177,395
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,316,608			—		2,316,608
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				373,459			—		373,459
	State and municipal securities	—				5,301			—		5,301
	Equity securities	6,357				—			—		6,357
	Other investments(1)	2,006				14,882			1,785		18,673
	Total investment securities available for sale	$	51,031			2,997,441			1,785		3,050,257
	Private equity investments	—				1,094			27,232		28,326
	Mutual funds held in Rabbi Trusts	10,817				—			—		10,817
	Derivative assets:
	Interest rate contracts	—				30,184			—		30,184
	Mortgage derivatives(2)	—				1,138			—		1,138
	Total derivative assets	$	—			31,322			—		31,322
	Liabilities
	Trading account liabilities	—				6,264			—		6,264
	Salary stock units	728				—			—		728
	Derivative liabilities:
	Interest rate contracts	—				30,689			—		30,689
	Mortgage derivatives(2)	—				320			—		320
	Visa derivative	—				—			4,021		4,021
	Total derivative liabilities	$	—			31,009			4,021		35,030
		December 31, 2013
	(in thousands)	Level 1				Level 2			Level 3		Total Assets and Liabilities at Fair Value
	Assets
	Trading securities:
	Collateralized mortgage obligations issued by U.S. Government sponsored enterprises	—				2,465			—		2,465
	State and municipal securities	—				429			—		429
	All other mortgage-backed securities	—				968			—		968
	Other investments	—				2,251			—		2,251
	Total trading securities	$	—			6,113			—		6,113
	Mortgage loans held for sale	—				45,384			—		45,384
	Investment securities available for sale:
	U.S. Treasury securities	17,791				—			—		17,791
	U.S. Government agency securities	—				34,641			—		34,641
	Securities issued by U.S. Government sponsored enterprises	—				113,745			—		113,745
	Mortgage-backed securities issued by U.S. Government agencies	—				195,117			—		195,117
Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,421,360			—		2,421,360
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				398,540			—		398,540
State and municipal securities	—				6,889			—		6,889
Equity securities	6,956				—			628		7,584
Other investments(1)	1,969				—			1,722		3,691
Total investment securities available for sale	$	26,716			3,170,292			2,350		3,199,358
Private equity investments	—				1,615			27,745		29,360
Mutual funds held in Rabbi Trusts	11,246				—			—		11,246
Derivative assets:
Interest rate contracts	—				38,482			—		38,482
Mortgage derivatives(2)	—				1,522			—		1,522
Total derivative assets	$	—			40,004			—		40,004
Liabilities
Trading account liabilities	—				1,763			—		1,763
Salary stock units	1,764				—			—		1,764
Derivative liabilities:
Interest rate contracts	—				39,436			—		39,436
Visa derivative	—				—			2,706		2,706
Total derivative liabilities	$	—			39,436			2,706		42,142
(1) Based on an analysis of the nature and risks of these investments, Synovus has determined that presenting these investments as a single asset class is appropriate.
(2) Mortgage derivatives consist of customer interest rate lock commitments that relate to the potential origination of mortgage loans, which would be classified as held for sale and forward loan sales commitments with third party investors.
Fair Value Option
Synovus has elected the fair value option for mortgage loans held for sale primarily to ease the operational burdens required to maintain hedge accounting for these loans. Synovus is still able to achieve effective economic hedges on mortgage loans held for sale without the operational time and expense needed to manage a hedge accounting program.
The following table summarizes the difference between the fair value and the unpaid principal balance of mortgage loans held for sale measured at fair value and the changes in fair value of these loans. Mortgage loans held for sale are initially measured at fair value with subsequent changes in fair value recognized in earnings. Changes in fair value were recorded as a component of mortgage banking income in the consolidated statements of income. An immaterial portion of these changes in fair value was attributable to changes in instrument-specific credit risk.
Changes in Fair Value Included in Net Income
	For the Nine Months Ended September 30,					For the Three Months Ended September 30,
(in thousands)	2014		2013			2014			2013
Mortgage loans held for sale	$969		(3,838	)		(813	)		4,092
Mortgage Loans Held for Sale
(in thousands)	As of September 30, 2014				As of December 31, 2013
Fair value	$	72,333			45,384
Unpaid principal balance	70,924				44,943
Fair value less aggregate unpaid principal balance	$	1,409			441
Changes in Level 3 Fair Value Measurements
As noted above, Synovus uses significant unobservable inputs (Level 3) in determining the fair value of assets and liabilities classified as Level 3 in the fair value hierarchy. The table below includes a roll-forward of the amounts on the consolidated balance sheet for the nine and three months ended September 30, 2014 and 2013 (including the change in fair value), for financial instruments of a material nature that are classified by Synovus within Level 3 of the fair value hierarchy and are measured at fair value on a recurring basis. Transfers between fair value levels are recognized at the end of the reporting period in which the associated changes in inputs occur. During the first nine months of 2014 and 2013, Synovus did not have any material transfers between levels in the fair value hierarchy.
	Nine Months Ended September 30,
	2014									2013
(in thousands)	Investment Securities Available for Sale				Private Equity Investments			Other Derivative		Investment Securities Available for Sale		Private Equity Investments		Other Derivative
								Contracts, Net						Contracts, Net
Beginning balance, January 1,	$	2,350			27,745			(2,706	)	$3,178		30,708		(2,956	)
Total gains (losses) realized/unrealized:
Included in earnings*	(88		)		(513	)		(2,731	)	—		(856	)	(801	)
Unrealized gains (losses) included in other comprehensive income	63				—			—		401		—		—
Purchases	—							—		—		—		—
Sales	—				—			—		—		—		—
Issuances	—				—			—		—		—		—
Settlements	(540		)		—			1,416		—		—		1,252
Amortization of discount/premium	—				—			—		—		—		—
Transfers in and/or out of Level 3	—				—			—		—		—		—
Ending balance, September 30,	$	1,785			27,232			(4,021	)	3,579		29,852		(2,505	)
Total net gains (losses) for the nine months included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at September 30,	$	(88	)		(513	)		(2,731	)	—		(856	)	(801	)
* Included in earnings as a component of non-interest income (expense).
	Three Months Ended September 30,
	2014									2013
(in thousands)	Investment Securities Available for Sale				Private Equity Investments			Other Derivative		Investment Securities Available for Sale		Private Equity Investments		Other Derivative
								Contracts, Net						Contracts, Net
Beginning balance, July 1,	$	1,866			27,376			(2,438	)	3,454		29,568		(2,977	)
Total gains (losses) realized/unrealized:
Included in earnings*	—				(144	)		(1,979	)	—		284		—
Unrealized gains (losses) included in other comprehensive income	(81		)		—			—		125		—		—
Purchases	—				—			—		—		—		—
Sales	—				—			—		—		—		—
Issuances	—				—			—		—		—		—
Settlements	—				—			396		—		—		472
Amortization of discount/premium	—				—			—		—		—		—
Transfers in and/or out of Level 3	—				—			—		—		—		—
Ending balance, September 30,	$	1,785			27,232			(4,021	)	3,579		29,852		(2,505	)
Total net gains (losses) for the three months included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at September 30,	$	—			(144	)		(1,979	)	—		284		—
* Included in earnings as a component of non-interest income (expense).
Assets Measured at Fair Value on a Non-recurring Basis
From time to time, certain assets may be recorded at fair value on a non-recurring basis. These non-recurring fair value adjustments typically are a result of the application of lower of cost or fair value accounting or a write-down occurring during the period. For example, if the fair value of an asset in these categories falls below its cost basis, it is considered to be at fair value at the end of the period of the adjustment. The following table presents assets measured at fair value on a non-recurring basis as of the dates indicated for which there was a fair value adjustment during the period, according to the valuation hierarchy included in ASC 820-10.
	September 30, 2014											December 31, 2013
(in thousands)	Level 1				Level 2			Level 3		Total		Level 1		Level 2		Level 3	Total
Impaired loans*	$	—			—			37,790		37,790		—		—		170,693	170,693
Other loans held for sale	—				—			338		338		—		—		9,670	9,670
Other real estate	—				—			25,928		25,928		—		—		50,070	50,070
Other assets held for sale	$	—			—			7,744		7,744		—		—		4,945	4,945
The following table presents fair value adjustments recognized for the nine and three months ended September 30, 2014 and 2013 for the assets measured at fair value on a non-recurring basis.
	Nine Months Ended September 30,							Three Months Ended September 30,
(in thousands)	2014				2013			2014			2013
Impaired loans*	$	20,661			27,624			$	9,380		4,630
Other loans held for sale	285				2,844			285			2,833
Other real estate	7,343				5,919			4,114			1,406
Other assets held for sale	$	7,608			246			$	100		76
* Impaired loans that are collateral-dependent.
Quantitative Information about Level 3 Fair Value Measurements
The tables below provide an overview of the valuation techniques and significant unobservable inputs used in those techniques to measure financial instruments that are classified within Level 3 of the valuation hierarchy. The range of sensitivities that management utilized in its fair value calculations is deemed acceptable in the industry with respect to the identified financial instruments. The tables below present both the total balance as of the dates indicated for assets measured at fair value on a recurring basis and the assets measured at fair value on a non-recurring basis for which there was a fair value adjustment during the period, according to the valuation hierarchy included in ASC 820-10.
September 30, 2014
(dollars in thousands)		Level 3 Fair Value			Valuation Technique	Significant Unobservable Input	Range
							(Weighted Average)(1)
Assets measured at fair
value on a recurring basis
Investment Securities Available for Sale:
Other Investments:
Trust preferred securities		1,785			Discounted cash flow analysis	Credit spread embedded in discount rate	450-550 bps (500 bps)
Private equity investments		27,232			Individual analysis of each investee company	Multiple factors, including but not limited to, current operations, financial condition, cash flows, evaluation of business management and financial plans, and recently executed financing transactions related to the investee companies	N/A
Visa derivative liability		4,021			Internal valuation	Multiple factors, including but not limited to, 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.	N/A
September 30, 2014
(dollars in thousands)		Level 3 Fair Value				Valuation Technique	Significant Unobservable Input	Range
								(Weighted Average)(1)
Assets measured at fair
value on a non-recurring basis
Collateral dependent impaired loans		$	37,790			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0% - 100% (48%)
							Estimated selling costs	0% - 10% (7%)
Other loans held for sale		338				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0% - 23% (23%)
							Estimated selling costs	0% - 10% (7%)
Other real estate		25,928				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0% - 38% (16%)
							Estimated selling costs	0% - 10% (7%)
Other assets held for sale		7,744				Third party appraised value of collateral less estimated selling costs or BOV	Discount to appraised value (2)	0%-100% (69%)
							Estimated selling costs	0%-10% (10%)
(1) The range represents management's best estimate of the high and low of the value that would be assigned to a particular input. For assets measured at fair value on a non-recurring basis, the weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability.
(2) Synovus also makes adjustments to the values of the assets listed above for various reasons, including age of the appraisal, information known by management about the property, such as occupancy rates, changes to the physical conditions of the property, and other factors.
December 31, 2013
(dollars in thousands)		Level 3 Fair Value				Valuation Technique	Significant Unobservable Input	Range (Weighted Average)(1)
Assets measured at fair
value on a recurring basis
Investment Securities Available for Sale:
Equity securities		$	628			Individual analysis of each investment	Multiple data points, including, but not limited to evaluation of past and projected business performance	N/A(3)
Other Investments:
Trust preferred securities		1,722				Discounted cash flow analysis	Credit spread embedded in discount rate	400-480 bps (441 bps)
Private equity investments		27,745				Individual analysis of each investee company	Multiple factors, including but not limited to, current operations, financial condition, cash flows, evaluation of business management and financial plans, and recently executed company transactions related to the investee companies	N/A
Visa derivative liability		2,706				Internal valuation	Multiple factors, including but not limited to, 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.	N/A
December 31, 2013
(dollars in thousands)		Level 3 Fair Value				Valuation Technique	Significant Unobservable Input	Range
								(Weighted Average)(1)
Assets measured at fair
value on a non-recurring basis
Collateral dependent impaired loans		$	170,693			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-65% (25%)
							Estimated selling costs	0%-10% (7%)
Other loans held for sale		9,670				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-12% (4%)
							Estimated selling costs	0%-10% (7%)
Other real estate		50,070				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-7% (2%)
							Estimated selling costs	0%-10% (7%)
Other assets held for sale		4,945				Third party appraised value of collateral less estimated selling costs or BOV	Discount to appraised value (2)	5%-36% (20%)
							Estimated selling costs	0%-10% (7%)
(1) The range represents management's best estimate of the high and low of the value that would be assigned to a particular input. For assets measured at fair value on a non-recurring basis, the weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability.
(2) Synovus also makes adjustments to the values of the assets listed above for various reasons, including age of the appraisal, information known by management about the property, such as occupancy rates, changes to the physical conditions of the property, and other factors.
(3) The range has not been disclosed due to the wide range of possible values given the methodology used.
Sensitivity Analysis of Level 3 Unobservable Inputs Measured on a Recurring Basis
Included in the fair value estimates of financial instruments carried at fair value on the consolidated balance sheet are those estimated in full or in part using valuation techniques based on assumptions that are not supported by observable market prices, rates, or other inputs. Unobservable inputs are assessed carefully, considering the current economic environment and market conditions. However, by their very nature, unobservable inputs imply a degree of uncertainty in their determination, because they are supported by little, if any, market activity for the related asset or liability.
Investment Securities Available for Sale
For the trust preferred securities in Level 3 assets, raising the credit spread, and raising the discount for lack of liquidity assumptions will result in a lower fair value measurement.
Private Equity Investments
In the absence of quoted market prices, inherent lack of liquidity, and the long-term nature of private equity investments, significant judgment is required to value these investments. The significant unobservable inputs used in the fair value measurement of private equity investments include current operations, financial condition, and cash flows, comparables and private sales, when available; and recently executed financing transactions related to investee companies. Significant increases or decreases in any of these inputs in isolation would result in a significantly lower or higher fair value measurement.
Visa Derivative Liability
The fair value of the Visa 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. Significant increases (decreases) in any of these inputs in isolation could result in a significantly higher (lower) valuation of the Visa derivative liability.
Fair Value of Financial Instruments
The following table presents the carrying and fair values of financial instruments at September 30, 2014 and December 31, 2013. The fair value represents management’s best estimates based on a range of methodologies and assumptions. For financial instruments that are not recorded at fair value on the balance sheet, such as loans, interest bearing deposits (including brokered deposits), and long-term debt, the amounts disclosed in the notes should not be considered an estimate of the amount that would be realized if all such financial instruments were to be settled immediately. See Note 16 "Fair Value Accounting" to the consolidated financial statements of Synovus' 2013 Form 10-K for a description of valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis and financial instruments that are not recorded at fair value on the balance sheet.
The carrying and estimated fair values of financial instruments, as well as the level within the fair value hierarchy, as of September 30, 2014 and December 31, 2013 are as follows:
	September 30, 2014
(in thousands)	Carrying Value				Estimated Fair Value			Level 1		Level 2		Level 3
Financial assets
Cash and cash equivalents	$	386,402			386,402			386,402		—		—
Interest bearing funds with Federal Reserve Bank	750,446				750,446			750,446		—		—
Interest earning deposits with banks	13,612				13,612			13,612		—		—
Federal funds sold and securities purchased under resale agreements	70,918				70,918			70,918		—		—
Trading account assets	12,705				12,705			97		12,608		—
Mortgage loans held for sale	72,333				72,333			—		72,333		—
Other loans held for sale	338				338			—		—		338
Investment securities available for sale	3,050,257				3,050,257			51,031		2,997,441		1,785
Private equity investments	28,326				28,326			—		1,094		27,232
Mutual funds held in Rabbi Trusts	10,817				10,817			10,817		—		—
Loans, net of deferred fees and costs	20,588,566				20,334,382			—		—		20,334,382
Derivative assets	31,322				31,322			—		31,322		—
Financial liabilities
Trading account liabilities	6,264				6,264			—		6,264		—
Non-interest bearing deposits	5,813,809				5,813,809			—		5,813,809		—
Interest bearing deposits	15,175,972				15,177,126			—		15,177,126		—
Federal funds purchased and securities sold under repurchase agreements	107,160				107,160			107,160		—		—
Salary stock units	728				728			728		—		—
Long-term debt	2,130,934				2,185,455			—		2,185,455		—
Derivative liabilities	$	35,030			35,030			—		31,009		4,021
	December 31, 2013
(in thousands)	Carrying Value				Estimated Fair Value			Level 1		Level 2		Level 3
Financial assets
Cash and cash equivalents	$	469,630			469,630			469,630		—		—
Interest bearing funds with Federal Reserve Bank	644,528				644,528			644,528		—		—
Interest earning deposits with banks	24,325				24,325			24,325		—		—
Federal funds sold and securities purchased under resale agreements	80,975				80,975			80,975		—		—
Trading account assets	6,113				6,113			—		6,113		—
Mortgage loans held for sale	45,384				45,384			—		45,384		—
Other loans held for sale	10,685				10,685			—		—		10,685
Investment securities available for sale	3,199,358				3,199,358			26,716		3,170,292		2,350
Private equity investments	29,360				29,360			—		1,615		27,745
Mutual funds held in Rabbi Trusts	11,246				11,246			11,246		—		—
Loans, net of deferred fees and costs	20,057,798				19,763,708			—		—		19,763,708
Derivative assets	40,004				40,004			—		40,004		—
Financial liabilities
Trading account liabilities	1,763				1,763			—		1,763		—
Non-interest bearing deposits	5,642,751				5,642,751			—		5,642,751		—
Interest bearing deposits	15,234,039				15,244,020			—		15,244,020		—
Federal funds purchased and securities sold under repurchase agreements	148,132				148,132			148,132		—		—
Salary stock units	1,764				1,764			1,764		—		—
Long-term debt	2,033,141				2,095,720			—		2,095,720		—
Derivative liabilities	$	42,142			42,142			—		39,436		2,706

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2014
Summary of Derivative Instruments [Abstract]	'
Derivative Instruments	'
	Note 11 - Derivative Instruments
	As part of its overall interest rate risk management activities, Synovus utilizes derivative instruments to manage its exposure to various types of interest rate risk. These derivative instruments generally consist of interest rate swaps, interest rate lock commitments made to prospective mortgage loan customers, and commitments to sell fixed-rate mortgage loans. Interest rate lock commitments represent derivative instruments since it is intended that such loans will be sold.
	Synovus may also utilize interest rate swaps to manage interest rate risks primarily arising from its core banking activities. These interest rate swap transactions generally involve the exchange of fixed and floating interest rate payment obligations without the exchange of underlying principal amounts. Swaps may be designated as either cash flow hedges or fair value hedges, as discussed below. As of September 30, 2014 and December 31, 2013, Synovus had no outstanding interest rate swap contracts utilized to manage interest rate risk.
	Synovus is party to master netting arrangements with its dealer counterparties; however, Synovus does not offset assets and liabilities under these arrangements for financial statement presentation purposes.
	Counterparty Credit Risk and Collateral
	Entering into derivative contracts potentially exposes Synovus to the risk of counterparties’ failure to fulfill their legal obligations, including, but not limited to, potential amounts due or payable under each derivative contract. Notional principal amounts are often used to express the volume of these transactions, but the amounts potentially subject to credit risk are much smaller. Synovus assesses the credit risk of its dealer counterparties by regularly monitoring publicly available credit rating information and other market indicators. Dealer collateral requirements are determined via risk-based policies and procedures and in accordance with existing agreements. Synovus seeks to minimize dealer credit risk by dealing with highly rated counterparties and by obtaining collateral for exposures above certain predetermined limits. Management closely monitors credit conditions within the customer swap portfolio, which management deems to be of higher risk than dealer counterparties. Collateral is secured at origination and credit related fair value adjustments are recorded against the asset value of the derivative as deemed necessary based upon an analysis, which includes consideration of the current asset value of the swap, customer credit rating, collateral value, and customer standing with regards to its swap contractual obligations and other related matters. Such asset values fluctuate based upon changes in interest rates regardless of changes in notional amounts and changes in customer specific risk.
	Cash Flow Hedges
	Synovus designates hedges of floating rate loans as cash flow hedges. These swaps hedge against the variability of cash flows from specified pools of floating rate prime based loans. Synovus calculates effectiveness of the hedging relationship quarterly using regression analysis. The effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transactions affect earnings. Ineffectiveness from cash flow hedges is recognized in the consolidated statements of income as a component of other non-interest income. As of September 30, 2014, there were no cash flow hedges outstanding, and therefore, no cumulative ineffectiveness.
	Synovus expects to reclassify from accumulated other comprehensive income (loss) $447 thousand of interest expense during the next twelve months as amortization of deferred losses are recorded.
	Synovus did not terminate any cash flow hedges during 2014 or 2013. The remaining unamortized deferred net loss balance of all previously terminated cash flow hedges at September 30, 2014 and December 31, 2013 was $(1.2) million and $(1.6) million, respectively.
	Fair Value Hedges
	Synovus designates hedges of fixed rate liabilities as fair value hedges. These swaps hedge against the change in fair value of various fixed rate liabilities due to changes in the benchmark interest rate, LIBOR. Synovus calculates effectiveness of the fair value hedges quarterly using regression analysis. Ineffectiveness from fair value hedges is recognized in the consolidated statements of income as a component of other non-interest income. As of September 30, 2014, there were no fair value hedges outstanding, and therefore, no cumulative ineffectiveness.
	Synovus did not terminate any fair value hedges during 2014 or 2013. The remaining unamortized deferred net gain balance on all previously terminated fair value hedges at September 30, 2014 and December 31, 2013 was $8.4 million and $10.7 million, respectively. Synovus expects to reclassify from hedge-related basis adjustment, a component of long-term debt, $3.1 million of the deferred gain balance on previously terminated fair value hedges as a reduction to interest expense during the next twelve months as amortization of deferred gains is recorded.
	Customer Related Derivative Positions
	Synovus enters into interest rate swap agreements to facilitate the risk management strategies of a small number of commercial banking customers. Synovus mitigates this risk by entering into equal and offsetting interest rate swap agreements with highly rated third party financial institutions. The interest rate swap agreements are free-standing derivatives and are recorded at fair value on Synovus' consolidated balance sheet. Fair value changes are recorded in non-interest income in Synovus' consolidated statements of income. As of September 30, 2014, the notional amount of customer related interest rate derivative financial instruments, including both the customer position and the offsetting position, was $1.08 billion, a decrease of $107.8 million compared to December 31, 2013.
	Visa Derivative
	In conjunction with the sale of Class B shares of common stock issued by Visa to Synovus as a Visa USA member, 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. The conversion ratio changes when Visa deposits funds to a litigation escrow established by Visa to pay settlements for certain litigation, for which Visa is indemnified by Visa USA members. The litigation escrow is funded by proceeds from Visa’s conversion of Class B shares. The fair value of the derivative contract was $4.0 million and $2.7 million at September 30, 2014 and December 31, 2013, 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.
	Mortgage Derivatives
	Synovus originates first lien residential mortgage loans for sale into the secondary market and generally does not hold the originated loans for investment purposes. Mortgage loans are sold by Synovus for conversion to securities and the servicing of these loans is generally sold to a third-party servicing aggregator, or Synovus sells the mortgage loans as whole loans to investors either individually or in bulk on a servicing released basis.
	Synovus enters into interest rate lock commitments for residential mortgage loans which commit us to lend funds to a potential borrower at a specific interest rate and within a specified period of time. Interest rate lock commitments that relate to the origination of mortgage loans that, if originated, will be held for sale, are considered derivative financial instruments under applicable accounting guidance. Outstanding interest rate lock commitments expose Synovus to the risk that the price of the mortgage loans underlying the commitments may decline due to increases in mortgage interest rates from inception of the rate lock to the funding of the loan.
	At September 30, 2014 and December 31, 2013, Synovus had commitments to fund at a locked interest rate, primarily fixed-rate mortgage loans to customers, in the amount of $78.0 million and $65.0 million, respectively. The fair value of these commitments resulted in a gain of $531 thousand and a loss of $682 thousand for the nine months ended September 30, 2014 and 2013, respectively, which was recorded as a component of mortgage banking income in the consolidated statements of income.
	At September 30, 2014 and December 31, 2013, outstanding commitments to sell primarily fixed-rate mortgage loans amounted to $105.5 million and $92.0 million, respectively. Such commitments are entered into to reduce the exposure to market risk arising from potential changes in interest rates, which could affect the fair value of mortgage loans held for sale and outstanding rate lock commitments, which guarantee a certain interest rate if the loan is ultimately funded or granted by Synovus as a mortgage loan held for sale. The commitments to sell mortgage loans are at fixed prices and are scheduled to settle at specified dates that generally do not exceed 90 days. The fair value of outstanding commitments to sell mortgage loans resulted in a loss of $(1.2) million for the nine months ended September 30, 2014 and 2013, which was recorded as a component of mortgage banking income in the consolidated statements of income.
	Collateral Contingencies
	Certain derivative instruments contain provisions that require Synovus to maintain an investment grade credit rating from each of the major credit rating agencies. When Synovus’ credit rating falls below investment grade, these provisions allow the counterparties of the derivative instrument to demand immediate and ongoing full collateralization on derivative instruments in net liability positions and, for certain counterparties, request immediate termination. As Synovus’ current rating is below investment grade, Synovus is required to post collateral, as required by each agreement, against these positions. Additionally, as of June 10, 2013, the CCC became mandatory for certain trades as required under the Dodd-Frank Act. These derivative transactions also carry collateral requirements, both at the inception of the trade, and as the value of each derivative position changes. As trades are migrated to the CCC, dealer counterparty exposure will be reduced, and higher notional amounts of Synovus' derivative instruments will be housed at the CCC, a highly regulated and well-capitalized entity. As of September 30, 2014, collateral totaling $68.1 million consisting of Federal funds sold was pledged to the derivative counterparties, including $3.8 million with the CCC, to comply with collateral requirements.
	The impact of derivative instruments on the consolidated balance sheets at September 30, 2014 and December 31, 2013 is presented below.
		Fair Value of Derivative Assets						Fair Value of Derivative Liabilities
	(in thousands)	Location on Consolidated Balance Sheet	September 30, 2014			December 31, 2013		Location on Consolidated Balance Sheet	September 30, 2014		December 31, 2013
	Derivatives not designated
	as hedging instruments:
	Interest rate contracts	Other assets	$	30,184		38,482		Other liabilities	$	30,689	39,436
	Mortgage derivatives	Other assets	1,138			1,522		Other liabilities	320		—
	Visa derivative		—			—		Other liabilities	4,021		2,706
	Total derivatives not		$	31,322		40,004			$	35,030	42,142
	designated as hedging
	instruments
	The pre-tax effect of fair value hedges on the consolidated statements of income for the nine and three months ended September 30, 2014 and 2013 is presented below.
		Location of Gain (Loss) Recognized in Income	Gain (Loss) Recognized in Income
	(in thousands)		Nine Months Ended September 30,
	Derivatives not designated as hedging instruments		2014			2013
	Interest rate contracts(1)	Other non-interest income	449			63
	Mortgage derivatives(2)	Mortgage banking income	(704		)	(1,865	)
	Total		$	(255	)	(1,802	)
		Location of Gain (Loss) Recognized in Income	Gain (Loss) Recognized in Income
	(in thousands)		Three Months Ended September 30,
	Derivatives not designated as hedging instruments		2014			2013
	Interest rate contracts(1)	Other non-interest income	65			221
	Mortgage derivatives(2)	Mortgage banking income	51			(6,806	)
	Total		$	116		(6,585	)
	(1) Gain (loss) represents net fair value adjustments (including credit related adjustments) for customer swaps and offsetting positions.
	(2) Gain (loss) represents net fair value adjustments recorded for interest rate lock commitments and commitments to sell mortgage loans to third party investors.
	During the nine months ended September 30, 2014 and 2013, Synovus also reclassified $2.3 million and $2.5 million, respectively, from hedge-related basis adjustment, a component of long-term debt, as a reduction to interest expense. These deferred gains relate to hedging relationships that have been previously terminated and are reclassified into earnings over the remaining life of the hedged items.

Net_Income_Per_Common_Share

Net Income Per Common Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net Income Per Common Share	'
	Note 12 - Net Income Per Common Share
	The following table displays a reconciliation of the information used in calculating basic and diluted earnings per common share for the nine and three months ended September 30, 2014 and 2013.
		Nine Months Ended September 30,			Three Months Ended September 30,
	(in thousands, except per share data)	2014		2013	2014	2013
	Basic Net Income Per Common Share:
	Net income available to common shareholders	$	134,399	82,704	44,229	37,188
	Weighted average common shares outstanding	138,989		123,652	139,043	136,671
	Basic net income per common share	$	0.97	0.67	0.32	0.27
	Diluted Net Income Per Common Share:
	Net income available to common shareholders	$	134,399	82,704	44,229	37,188
	Weighted average common shares outstanding	138,989		123,652	139,043	136,671
	Potentially dilutive shares from assumed exercise of	611		8,823	683	426
	securities or other contracts to purchase Common Stock
	Weighted average diluted common shares	139,600		132,476	139,726	137,097
	Diluted net income per common share	$	0.96	0.62	0.32	0.27
	A reverse stock split became effective on May 16, 2014, and Synovus' shares of common stock began trading on a post-split basis on the NYSE at the opening of trading on May 19, 2014. Share and per share amounts included in this Report for prior periods have been adjusted to reflect the one-for-seven reverse stock split.
	Basic net income per common share is computed by dividing net income by the average common shares outstanding for the period. Diluted net income per common share reflects the dilution that could occur if securities or other contracts to issue Common Stock were exercised or converted. The dilutive effect of outstanding options and restricted share units is reflected in diluted net income per common share, unless the impact is anti-dilutive, by application of the treasury stock method.
	During 2010, 13,800,000 units of tMEDS were issued through a public offering. On May 15, 2013, each remaining tMED automatically settled, and Synovus issued 17.6 million shares of Common Stock. As a result, these shares are no longer potentially dilutive shares from assumed exercise of these contracts to purchase Common Stock.
	As of September 30, 2014 and 2013, there were 3.2 million and 3.6 million, respectively, potentially dilutive shares related to Common Stock options and Warrants to purchase shares of Common Stock that were outstanding during 2014 and 2013, but were not included in the computation of diluted net income per common share because the effect would have been anti-dilutive.

Sharebased_Compensation

Share-based Compensation	9 Months Ended
	Sep. 30, 2014
Share-based Compensation [Abstract]	'
Share-based Compensation	'
	Note 13 - Share-based Compensation
	General Description of Share-based Plans
	Synovus has a long-term incentive plan under which the Compensation Committee of the Board of Directors has the authority to grant share-based awards to Synovus employees. At September 30, 2014, Synovus had a total of 7,550,907 shares of its authorized but unissued Common Stock reserved for future grants under the 2013 Omnibus Plan. The 2013 Omnibus Plan authorizes 8,571,429 common share equivalents available for grant, where grants of options count as one share equivalent and grants of full value awards (e.g., restricted share units, market restricted share units) count as 2 share equivalents. Any restricted share units that are forfeited and options that expire unexercised will again become available for issuance under the Plan. The Plan permits grants of share-based compensation including stock options, non-vested shares, and restricted share units. The grants generally include vesting periods ranging from two to five years and contractual terms of 10 years. Stock options are granted at exercise prices which equal the fair value of a share of common stock on the grant-date. Synovus has historically issued new shares to satisfy share option exercises and share unit conversions. Dividend equivalents are paid on outstanding restricted share units in the form of additional restricted share units that vest over the same vesting period or the vesting period left on the original restricted share unit grant.
	Share-based Compensation Expense
	Share-based compensation costs associated with employee grants are recorded as a component of salaries and other personnel expense in the consolidated statements of income. Share-based compensation costs associated with grants made to non-employee directors of Synovus are recorded as a component of other operating expenses. Share-based compensation expense for service-based awards is recognized net of estimated forfeitures for plan participants on a straight-line basis over the vesting period. Total share-based compensation expense was $7.5 million and $2.8 million for the nine and three months ended September 30, 2014 respectively, and $5.8 million and $2.3 million for the nine and three months ended September 30, 2013, respectively.
	Stock Options
	No stock option grants were made during the nine months ended September 30, 2014. At September 30, 2014, there were 2,615,051 options to purchase shares of Common Stock outstanding with a weighted average exercise price of $44.48.
	Restricted Share Units, Performance Share Units, and Market Restricted Share Units
	During the nine months ended September 30, 2014, Synovus awarded 407,374 restricted share units that have a service-based vesting period of three years and awarded 67,157 performance share units that vest upon service conditions and performance conditions. Synovus also granted 90,117 market restricted share units during the nine months ended September 30, 2014. The weighted average grant-date fair value of the awarded restricted share units, performance share units and market restricted share units was $23.76 per share. At September 30, 2014, including dividend equivalents granted, there were 1,084,659 restricted share units, performance share units and market restricted share units outstanding with a weighted average grant-date fair value of $20.59.
	During the nine months ended September 30, 2014, Synovus also granted 30,786 salary stock units to senior management, which vested and were expensed immediately upon grant. Compensation expense is initially determined based on the number of salary stock units granted and the market price of Common Stock at the grant date. Subsequent to the grant date, compensation expense is recorded for changes in Common Stock market price. The total fair value of salary stock units granted during the nine months ended September 30, 2014 was $728 thousand. The salary stock units granted during 2014 are classified as liabilities and will be settled in cash on January 15, 2015.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 14 - Income Taxes
	The valuation allowance for deferred tax assets was $15.2 million and $14.6 million at September 30, 2014 and December 31, 2013, respectively.  The $621 thousand increase in the valuation allowance from December 31, 2013 to September 30, 2014 is related to certain state income tax credits that are expected to expire before they can be utilized.  Management assesses the need for a valuation allowance for deferred tax assets at each reporting period. The determination of whether a valuation allowance for deferred tax assets is appropriate is subject to considerable judgment and requires an evaluation of all the positive and negative evidence.  Based on the assessment of all of the positive and negative evidence at September 30, 2014, management has concluded that it is more likely than not that $656.2 million of the net deferred tax asset will be realized based upon future taxable income.
	Synovus expects to realize substantially all of the $656.2 million in net deferred tax assets well in advance of the statutory carryforward period. At September 30, 2014, $186.1 million of existing deferred tax assets are not related to net operating losses or credits and, therefore, have no expiration dates. Approximately $378.9 million of the remaining deferred tax assets relate to federal net operating losses which expire in years beginning in 2028 through 2032. Additionally, $54.0 million of the deferred tax assets relate to state NOLs which will expire in installments annually through the tax year 2034. Tax credit carryforwards at September 30, 2014 include federal alternative minimum tax credits totaling $25.3 million, which have an unlimited carryforward period. Other federal and state tax credits at September 30, 2014 total $27.1 million and have expiration dates through the tax year 2034.
	The valuation allowance could fluctuate in future periods based on management's assessment of the positive and negative evidence. Management's conclusion at September 30, 2014 that it is more likely than not that the net deferred tax assets of $656.2 million will be realized is based upon management's estimate of future taxable income. Management's estimate of future taxable income is based on internal projections which consider historical performance, various internal estimates and assumptions, as well as certain external data, all of which management believes to be reasonable although inherently subject to significant judgment. If actual results differ significantly from the current estimates of future taxable income, the valuation allowance may need to be increased. Such an increase to the deferred tax asset valuation allowance could have a material adverse effect on Synovus' financial condition or results of operations.
	Synovus is subject to income taxation in the United States and various state jurisdictions.  Synovus' federal income tax return is filed on a consolidated basis, while state income tax returns are filed on both a consolidated and separate entity basis. Currently, no years for which Synovus filed a Federal income tax return are under examination by the IRS. A state tax examination by the Tennessee Department of Revenue is currently in progress. Synovus is no longer subject to income tax examinations by the IRS for years before 2010, and excluding certain limited exceptions, Synovus is no longer subject to income tax examinations by state and local income tax authorities for years before 2009. Although Synovus is unable to determine the ultimate outcome of current and future examinations, Synovus believes that the liability recorded for uncertain tax positions is adequate.

Legal_Proceedings

Legal Proceedings	9 Months Ended
	Sep. 30, 2014
Legal Proceedings Disclosure [Abstract]	'
Legal Proceedings	'
	Note 15 - Legal Proceedings
	Synovus and its subsidiaries are subject to various legal proceedings and claims that arise in the ordinary course of its business. Additionally, in the ordinary course of business, Synovus and its subsidiaries are subject to regulatory examinations, information gathering requests, inquiries and investigations. Synovus, like many other financial institutions, has been the target of numerous legal actions and other proceedings asserting claims for damages and related relief for losses resulting from the recent financial crisis. These actions include claims and counterclaims asserted by individual borrowers related to their loans and allegations of violations of state and federal laws and regulations relating to banking practices, including several purported putative class action matters. In addition to actual damages if Synovus does not prevail in any asserted legal action, credit-related litigation could result in additional write-downs or charge-offs of assets, which could adversely affect Synovus' results of operations during the period in which the write-down or charge-off occurred.
	Synovus carefully examines and considers each legal matter, and, in those situations where Synovus determines that a particular legal matter presents loss contingencies that are both probable and reasonably estimable, Synovus establishes an appropriate accrual. An event is considered to be probable if the future event is likely to occur. While the final outcome of any legal proceeding is inherently uncertain, based on the information currently available, advice of counsel and available insurance coverage, management believes that the amounts accrued with respect to legal matters as of September 30, 2014 are adequate. The actual costs of resolving legal claims may be higher or lower than the amounts accrued.
	In addition, where Synovus determines that there is a reasonable possibility of a loss in respect of legal matters, including those legal matters described below, Synovus considers whether it is able to estimate the total reasonably possible loss or range of loss. An event is reasonably possible if the chance of the future event or events occurring is more than remote but less than likely. An event is remote if the chance of the future event occurring is slight. In many situations, Synovus may be unable to estimate reasonably possible losses due to the preliminary nature of the legal matters, as well as a variety of other factors and uncertainties. For those legal matters where Synovus is able to estimate a range of reasonably possible losses, management currently estimates the aggregate range from our outstanding litigation, including, without limitation, the matters described below, is from zero to $15 million in excess of the amounts accrued, if any, related to those matters. This estimated aggregate range is based upon information currently available to Synovus, and the actual losses could prove to be higher. As there are further developments in these legal matters, Synovus will reassess these matters, and the estimated range of reasonably possible losses may change as a result of this assessment. Based on Synovus' current knowledge and advice of counsel, management presently does not believe that the liabilities arising from these legal matters will have a material adverse effect on Synovus' consolidated financial condition, results of operations or cash flows. However, it is possible that the ultimate resolution of these legal matters could have a material adverse effect on Synovus' results of operations for any particular period.
	Synovus intends to vigorously pursue all available defenses to these legal matters, but will also consider other alternatives, including settlement, in situations where there is an opportunity to resolve such legal matters on terms that Synovus considers to be favorable, including in light of the continued expense and distraction of defending such legal matters. Synovus also maintains insurance coverage, which may (or may not) be available to cover legal fees, or potential losses that might be incurred in connection with the legal matters described below. The above-noted estimated range of reasonably possible losses does not take into consideration insurance coverage which may or may not be available for the respective legal matters.
	Securities Class Action
	On July 7, 2009, the City of Pompano Beach General Employees' Retirement System filed suit against Synovus, and certain of Synovus' current and former officers, in the United States District Court, Northern District of Georgia (Civil Action File No. 1:09-CV-1811) (the “Securities Class Action”); and on June 11, 2010, Lead Plaintiffs, the Labourers' Pension Fund of Central and Eastern Canada and the Sheet Metal Workers' National Pension Fund, filed an amended complaint alleging that Synovus and the named individual defendants misrepresented or failed to disclose material facts that artificially inflated Synovus' stock price in violation of the federal securities laws. Lead Plaintiffs' allegations are based on purported exposure to Synovus' lending relationship with the Sea Island Company and the impact of such alleged exposure on Synovus' financial condition. Lead Plaintiffs in the Securities Class Action seek damages in an unspecified amount. On October 4, 2013, the Lead Plaintiffs and the Defendants reached a settlement-in-principle to settle the Securities Class Action. Under the settlement in principle, the Defendants shall cause to be paid $11.8 million to the Lead Plaintiffs (the “Securities Class Action Settlement Payment”) in exchange for broad releases, dismissal with prejudice of the Securities Class Action and other material and customary terms and conditions. On March 17, 2014, the Lead Plaintiffs filed a motion with the District Court for preliminary approval of the Securities Class Action Settlement Payment. The District Court granted preliminary approval of the Securities Class Action Settlement Payment on June 4, 2014. The hearing date for the final approval was originally scheduled for October 7, 2014, but has been postponed to November 18, 2014. Synovus expects that, subject to execution of an appropriate release of the Defendants’ insurance carriers and other customary acknowledgments by the Defendants, the Securities Class Action Settlement Payment will be fully covered by insurance. There can be no assurance that the settlement-in-principle will be finally approved by the District Court. In the event the settlement-in-principle of the Securities Class Action is not approved by the District Court and finally settled, Synovus and the individually named defendants collectively intend to vigorously defend themselves against the Securities Class Action.
	Overdraft Litigation
	Posting Order Litigation
	On September 21, 2010, Synovus, Synovus Bank and CB&T were named as defendants in a putative multi-state class action relating to the manner in which Synovus Bank charges overdraft fees to customers (Posting Order Litigation). The case, Childs et al. v. Columbus Bank and Trust et al., was filed in the Northern District of Georgia, Atlanta Division, and asserts claims for breach of contract and breach of the covenant of good faith and fair dealing, unconscionability, conversion and unjust enrichment for alleged injuries suffered by plaintiffs as a result of Synovus Bank's assessment of overdraft charges in connection with its POS/debit and automated-teller machine cards allegedly resulting from the sequence used to post payments to the plaintiffs' accounts. On October 25, 2010, the Childs case was transferred to a multi-district proceeding in the Southern District of Florida. In Re: Checking Account Overdraft Litigation, MDL No. 2036.
	On August 23, 2014, Synovus reached a settlement in principle with plaintiffs' counsel to settle the Posting Order Litigation. Under the settlement in principle, Synovus shall cause to be paid $3.75 million plus payment of $150,000 in settlement expenses (the "Posting Order Settlement Payment") in exchange for broad releases, dismissal with prejudice of the Posting Order Litigation and other material and customary terms and conditions. There can be no assurance that the settlement in principle will be approved by the District Court. In the event the settlement in principle of the posting Order Litigation is not approved by the District Court and finally settled, Synovus intends to vigorously defend itself against the Posting Order Litigation.
	Assertion of Overdraft Fees as Interest Litigation
	Synovus Bank was also named as a defendant in a putative state-wide class action in which the plaintiffs allege that overdraft fees charged to customers constitute interest and, as such, are usurious under Georgia law. The case, Griner et. al. v. Synovus Bank, et. al. was filed in Gwinnett County State Court (State of Georgia) on July 30, 2010, and asserts claims for usury, conversion and money had and received for alleged injuries suffered by the plaintiffs as a result of Synovus Bank's assessment of overdraft charges in connection with its POS/debit and automated-teller machine cards used to access customer accounts ("the Griner Overdraft Litigation"). Plaintiffs contend that such overdraft charges constitute interest and are therefore subject to Georgia usury laws. Synovus Bank contends that such overdraft charges constitute non-interest fees and charges under both federal and Georgia law and are otherwise exempt from Georgia usury limits.
	On February 3, 2014, the Gwinnett County State Court (State of Georgia) issued an order preliminarily approving the proposed settlement (the “Griner Settlement”) by and among Synovus Financial Corp. and Synovus Bank (collectively referred to herein as “Synovus”), and the plaintiffs in the Griner Overdraft Litigation. Under the terms of the Griner Settlement, Synovus has agreed to (1) establish a fund to pay eligible class member claims and (2) pay an agreed-upon amount of fees to counsel for the plaintiffs in the Griner Overdraft Litigation. In exchange, each purported class member in the Griner Overdraft Litigation will give Synovus a full and final general release of all claims alleged or that could be alleged in the Griner Overdraft Litigation. The final fairness hearing on the Griner Settlement was held on May 20, 2014, and the Griner Settlement was approved by the Court. Substantially all amounts owed by Synovus pursuant to the Griner Settlement have been paid as of the date of this Report.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	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.

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2014
Investments [Abstract]	'
Summary of Available-for-Sale Investment Securities	'
	The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities available for sale at September 30, 2014 and December 31, 2013 are summarized below.
			September 30, 2014
	(in thousands)		Amortized Cost(1)				Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	42,627			41			—			42,668
	U.S. Government agency securities		26,435				1,034			—			27,469
	Securities issued by U.S. Government sponsored enterprises		81,549				778			—			82,327
	Mortgage-backed securities issued by U.S. Government agencies		176,254				2,074			(933	)		177,395
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,323,561				13,516			(20,469	)		2,316,608
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		371,656				4,052			(2,249	)		373,459
	State and municipal securities		5,099				204			(2	)		5,301
	Equity securities		3,228				3,129			—			6,357
	Other investments		19,110				—			(437	)		18,673
	Total investment securities available for sale		$	3,049,519			24,828			(24,090	)		3,050,257
			31-Dec-13
	(in thousands)		Amortized Cost(1)				Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	17,791			—			—			17,791
	U.S. Government agency securities		33,480				1,161			—			34,641
	Securities issued by U.S. Government sponsored enterprises		112,305				1,440			—			113,745
	Mortgage-backed securities issued by U.S. Government agencies		196,521				2,257			(3,661	)		195,117
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,443,282				9,718			(31,640	)		2,421,360
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		406,717				698			(8,875	)		398,540
	State and municipal securities		6,723				168			(2	)		6,889
	Equity securities		3,856				3,728			—			7,584
	Other investments		4,074				—			(383	)		3,691
	Total investment securities available for sale		$	3,224,749			19,170			(44,561	)		3,199,358
	(1)	Amortized cost is adjusted for other-than-temporary impairment charges in 2014 and 2013, which have been recognized in the consolidated statements of income in the applicable year, and were considered inconsequential.
Schedule of Unrealized Loss on Investments	'
	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2014 and December 31, 2013, are presented below.
		September 30, 2014
		Less than 12 Months							12 Months or Longer						Total
	(in thousands)	Fair				Gross Unrealized			Fair			Gross Unrealized			Fair	Gross Unrealized
		Value				Losses			Value			Losses			Value	Losses
	U.S. Treasury securities	$	—			—			—			—			—	—
	U.S. Government agency securities	—				—			—			—			—	—
	Securities issued by U.S. Government sponsored enterprises	—				—			—			—			—	—
	Mortgage-backed securities issued by U.S. Government agencies	9,678				14			29,955			919			39,633	933
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	220,542				562			1,099,220			19,907			1,319,762	20,469
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				—			122,239			2,249			122,239	2,249
	State and municipal securities	—				—			43			2			43	2
	Equity securities	—				—			—			—			—	—
	Other investments	16,889				221			1,784			216			18,673	437
	Total	$	247,109			797			1,253,241			23,293			1,500,350	24,090
		December 31, 2013
		Less than 12 Months							12 Months or Longer						Total
	(in thousands)	Fair				Gross Unrealized			Fair			Gross Unrealized			Fair	Gross Unrealized
		Value				Losses			Value			Losses			Value	Losses
	U.S. Treasury securities	$	—			—			—			—			—	—
	U.S. Government agency securities	—				—			—			—			—	—
	Securities issued by U.S. Government sponsored enterprises	—				—			—			—			—	—
	Mortgage-backed securities issued by U.S. Government agencies	121,607				3,363			2,951			298			124,558	3,661
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	1,885,521				31,640			—			—			1,885,521	31,640
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	282,898				8,875			—			—			282,898	8,875
	State and municipal securities	—				—			40			2			40	2
	Equity securities	—				—			—			—			—	—
	Other investments	1,969				105			1,722			278			3,691	383
	Total	$	2,291,995			43,983			4,713			578			2,296,708	44,561
Amortized Cost and Estimated Fair Value by Contractual Maturity of Investment Securities Available-for-Sale	'
	For purposes of the maturity table, mortgage-backed securities and CMOs, which are not due at a single maturity date, have been classified based on the final contractual maturity date.
		Distribution of Maturities at September 30, 2014
	(in thousands)	Within One				1 to 5			5 to 10			More Than			No Stated	Total
		Year				Years			Years			10 Years			Maturity
	Amortized Cost
	U.S. Treasury securities	$	17,793			24,834			—			—			—	42,627
	U.S. Government agency securities	78				12,577			13,780			—			—	26,435
	Securities issued by U.S. Government sponsored enterprises	—				81,549			—			—			—	81,549
	Mortgage-backed securities issued by U.S. Government agencies	5				1			—			176,248			—	176,254
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	431				1,605			1,926,129			395,396			—	2,323,561
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				—			—			371,656			—	371,656
	State and municipal securities	100				1,971			289			2,739			—	5,099
	Equity securities	—				—			—			—			3,228	3,228
	Other investments	—				—			—			17,000			2,110	19,110
	Total amortized cost	$	18,407			122,537			1,940,198			963,039			5,338	3,049,519
	Fair Value
	U.S. Treasury securities	$	17,793			24,875			—			—			—	42,668
	U.S. Government agency securities	80				13,014			14,375			—			—	27,469
	Securities issued by U.S. Government sponsored enterprises	—				82,327			—			—			—	82,327
	Mortgage-backed securities issued by U.S. Government agencies	5				1			—			177,389			—	177,395
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	456				1,707			1,912,088			402,357			—	2,316,608
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				—			—			373,459			—	373,459
	State and municipal securities	100				2,009			305			2,887			—	5,301
	Equity securities	—				—			—			—			6,357	6,357
	Other investments	—				—			—			16,666			2,007	18,673
	Total fair value	$	18,434			123,933			1,926,768			972,758			8,364	3,050,257
Schedule of Activity for Available-for-Sale Securities	'
	Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the nine and three months ended September 30, 2014 and 2013 are presented below. Other-than-temporary impairment charges of $88 thousand are included in gross realized losses for the nine months ended September 30, 2014. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale.
			Nine Months Ended September 30,							Three Months Ended September 30,
	(in thousands)		2014				2013			2014			2013
	Proceeds from sales of investment securities available for sale		$	20,815			$403,792			—			56,406
	Gross realized gains		1,419				3,185			—			1,150
	Gross realized losses		(88		)		(614	)		—			(26	)
	Investment securities gains, net		$	1,331			2,571			—			1,124

Restructuring_Charges_Tables

Restructuring Charges (Tables)	9 Months Ended
	Sep. 30, 2014
Restructuring Charges [Abstract]	'
Schedule of Restructuring and Related Costs	'
	For the nine and three months ended September 30, 2014 and 2013 total restructuring charges are as follows:
		Nine Months Ended September 30,				Three Months Ended September 30,
	(in thousands)	2014		2013		2014		2013
	Severance charges	$	8,046	7,311		$	—	701
	Asset impairment charges	7,374		—		36		—
	Professional fees and other charges	1,681		(16	)	773		(14	)
	Total restructuring charges	$	17,101	7,295		$	809	687

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2014
Allowance for Loan and Lease Losses, Adjustments, Net [Abstract]	'
Schedule of Current, Accruing Past Due, and Nonaccrual Loans	'
	The following is a summary of current, accruing past due, and non-accrual loans by portfolio class as of September 30, 2014 and December 31, 2013.
	Current, Accruing Past Due, and Non-accrual Loans
		September 30, 2014
	(in thousands)	Current				Accruing 30-89 Days Past Due			Accruing 90 Days or Greater Past Due			Total Accruing Past Due			Non-accrual			Total
	Investment properties	$	4,978,360			1,565			142			1,707			38,979			5,019,046
	1-4 family properties	1,098,574				9,759			103			9,862			29,118			1,137,554
	Land acquisition	546,490				2,085			76			2,161			40,128			588,779
	Total commercial real estate	6,623,424				13,409			321			13,730			108,225			6,745,379
	Commercial, financial and agricultural	5,935,845				13,659			545			14,204			53,360			6,003,409
	Owner-occupied	3,970,755				15,871			230			16,101			26,810			4,013,666
	Total commercial and industrial	9,906,600				29,530			775			30,305			80,170			10,017,075
	Home equity lines	1,658,917				9,656			524			10,180			16,875			1,685,972
	Consumer mortgages	1,574,526				11,615			1,004			12,619			34,759			1,621,904
	Credit cards	250,768				1,688			1,397			3,085			—			253,853
	Other retail	288,086				2,747			46			2,793			2,353			293,232
	Total retail	3,772,297				25,706			2,971			28,677			53,987			3,854,961
	Total loans	$	20,302,321			68,645			4,067			72,712			242,382			20,617,415	(1	)
		December 31, 2013
	(in thousands)	Current				Accruing 30-89 Days Past Due			Accruing 90 Days or Greater Past Due			Total Accruing Past Due			Non-accrual			Total
	Investment properties	$	4,546,439			3,552			40			3,592			66,454			4,616,485
	1-4 family properties	1,144,447				6,267			527			6,794			33,819			1,185,060
	Land acquisition	549,936				1,100			300			1,400			154,095			705,431
	Total commercial real estate	6,240,822				10,919			867			11,786			254,368			6,506,976
	Commercial, financial and agricultural	5,812,490				18,985			813			19,798			62,977			5,895,265
	Owner-occupied	3,985,705				11,113			129			11,242			39,239			4,036,186
	Total commercial and industrial	9,798,195				30,098			942			31,040			102,216			9,931,451
	Home equity lines	1,564,578				4,919			136			5,055			17,908			1,587,541
	Consumer mortgages	1,460,219				18,068			1,011			19,079			39,770			1,519,068
	Credit cards	253,422				1,917			1,507			3,424			—			256,846
	Other retail	280,524				2,190			26			2,216			2,038			284,778
	Total retail	3,558,743				27,094			2,680			29,774			59,716			3,648,233
	Total loans	$	19,597,760			68,111			4,489			72,600			416,300			20,086,660	(2	)
	(1)Total before net deferred fees and costs of $28.8 million.
	(2)Total before net deferred fees and costs of $28.9 million.
Loan Portfolio Credit Exposure	'
	In the following tables, retail loans and small business loans are generally assigned a risk grade similar to the classifications described above; however, upon reaching 90 days and 120 days past due, they are generally downgraded to Substandard and Loss, respectively, in accordance with the FFIEC Uniform Retail Credit Classification and Account Management Policy. Additionally, in accordance with the Interagency Supervisory Guidance on Allowance for Loan and Lease Losses Estimation Practices for Loans and Lines of Credit Secured by Junior Liens on 1-4 Family Residential Properties, the risk grade classifications of retail loans (home equity lines and consumer mortgages) secured by junior liens on 1-4 family residential properties also consider available information on the payment status of the associated senior lien with other financial institutions.
	Loan Portfolio Credit Exposure by Risk Grade
		September 30, 2014
	(in thousands)	Pass				Special			Substandard(1)			Doubtful(2)			Loss			Total
						Mention
	Investment properties	$	4,687,315			197,501			134,230			—			—			5,019,046
	1-4 family properties	925,346				99,686			104,994			7,528			—			1,137,554
	Land acquisition	460,829				55,707			71,336			907			—			588,779
	Total commercial real estate	6,073,490				352,894			310,560			8,435			—			6,745,379
	Commercial, financial and agricultural	5,667,272				174,559			151,871			8,562			1,145		(3)	6,003,409
	Owner-occupied	3,728,191				124,702			159,502			839			432		(3)	4,013,666
	Total commercial and industrial	9,395,463				299,261			311,373			9,401			1,577			10,017,075
	Home equity lines	1,661,751				—			19,239			2,090			2,892		(3)	1,685,972
	Consumer mortgages	1,577,632				—			42,323			1,610			339		(3)	1,621,904
	Credit cards	252,510				—			539			—			804		(4)	253,853
	Other retail	289,713				—			3,383			32			104		(3)	293,232
	Total retail	3,781,606				—			65,484			3,732			4,139			3,854,961
	Total loans	$	19,250,559			652,155			687,417			21,568			5,716			20,617,415	(5	)
		31-Dec-13
	(in thousands)	Pass				Special			Substandard(1)			Doubtful(2)			Loss			Total
						Mention
	Investment properties	$	4,197,368			249,890			167,503			1,724			—			4,616,485
	1-4 family properties	920,392				126,715			129,599			8,062			292		(3)	1,185,060
	Land acquisition	422,054				94,316			186,514			2,547			—			705,431
	Total commercial real estate	5,539,814				470,921			483,616			12,333			292			6,506,976
	Commercial, financial and agricultural	5,451,369				224,620			208,422			10,764			90		(3)	5,895,265
	Owner-occupied	3,714,400				155,097			164,560			2,129			—			4,036,186
	Total commercial and industrial	9,165,769				379,717			372,982			12,893			90			9,931,451
	Home equity lines	1,559,272				—			25,177			1,314			1,778		(3)	1,587,541
	Consumer mortgages	1,475,928				—			40,368			2,485			287		(3)	1,519,068
	Credit cards	255,339				—			541			—			966		(4)	256,846
	Other retail	281,179				—			3,400			75			124		(3)	284,778
	Total retail	3,571,718				—			69,486			3,874			3,155			3,648,233
	Total loans	$	18,277,301			850,638			926,084			29,100			3,537			20,086,660	(6	)
	(1) Includes $215.1 million and $383.7 million of non-accrual Substandard loans at September 30, 2014 and December 31, 2013, respectively.
	(2) The loans within this risk grade are on non-accrual status. Commercial loans generally have an allowance for loan losses in accordance with ASC 310, and retail loans generally have an allowance for loan losses equal to 50% of the loan amount.
	(3) The loans within this risk grade are on non-accrual status and have an allowance for loan losses equal to the full loan amount.
	(4) Represent amounts that were 120 days past due. These credits are downgraded to the Loss category with an allowance for loan losses equal to the full loan amount and are generally charged off upon reaching 181 days past due in accordance with the FFIEC Uniform Retail Credit Classification and Account Management Policy.
	(5)Total before net deferred fees and costs of $28.8 million.
	(6)Total before net deferred fees and costs of
Schedule of Allowances for Loan Losses and Recorded Investment in Loans	'
	The following table details the changes in the allowance for loan losses by loan segment for the nine months ended September 30, 2014 and 2013.
	Allowance for Loan Losses and Recorded Investment in Loans
		As Of and For The Nine Months Ended September 30, 2014
	(in thousands)	Commercial Real Estate				Commercial & Industrial			Retail			Unallocated			Total
	Allowance for loan losses:
	Beginning balance	$	127,646			115,435			41,479			23,000			307,560
	Allowance for loan losses of sold branches	(281		)		(398	)		(340	)		—			(1,019	)
	Charge-offs	(41,139		)		(26,896	)		(19,082	)		—			(87,117	)
	Recoveries	8,318				9,562			6,434			—			24,314
	Provision (credit) for loan losses	7,445				27,140			14,053			(23,000	)		25,638
	Ending balance	$	101,989			124,843			42,544			—			269,376
	Ending balance: individually evaluated for impairment	22,107				15,863			1,195			—			39,165
	Ending balance: collectively evaluated for impairment	$	79,882			108,980			41,349			—			230,211
	Loans:
	Ending balance: total loans(1)	$	6,745,379			10,017,075			3,854,961			—			20,617,415
	Ending balance: individually evaluated for impairment	317,011				172,860			47,669			—			537,540
	Ending balance: collectively evaluated for impairment	$	6,428,368			9,844,215			3,807,292			—			20,079,875
		As Of and For The Nine Months Ended September 30, 2013
	(in thousands)	Commercial Real Estate				Commercial & Industrial			Retail			Unallocated			Total
	Allowance for loan losses:
	Beginning balance	$	167,926			138,495			38,984			28,000			373,405
	Charge-offs	(73,825		)		(44,104	)		(27,359	)		—			(145,288	)
	Recoveries	11,861				17,266			5,834			—			34,961
	Provision (credit) for loan losses	31,221				7,462			21,851			(5,000	)		55,534
	Ending balance	$	137,183			119,119			39,310			23,000			318,612
	Ending balance: individually evaluated for impairment	50,737				25,194			2,120			—			78,051
	Ending balance: collectively evaluated for impairment	$	86,446			93,925			37,190			23,000			240,561
	Loans:
	Ending balance: total loans(2)	$	6,458,518			9,705,425			3,572,669			—			19,736,612
	Ending balance: individually evaluated for impairment	569,128				259,764			53,061			—			881,953
	Ending balance: collectively evaluated for impairment	$	5,889,390			9,445,661			3,519,608			—			18,854,659
	(1)Total before net deferred fees and costs of $28.8 million.
	(2)Total before net deferred fees and costs of $25.0 million.
	The following table details the changes in the allowance for loan losses by loan segment for the three months ended September 30, 2014 and 2013.
	Allowance for Loan Losses and Recorded Investment in Loans
		As Of and For The Three Months Ended September 30, 2014
	(in thousands)	Commercial Real Estate				Commercial & Industrial				Retail			Unallocated			Total
	Allowance for loan losses:
	Beginning balance	$	104,394			130,814				42,575			—			277,783
	Charge-offs	(5,233		)		(11,306		)		(6,222	)		—			(22,761	)
	Recoveries	3,099				5,257				2,155			—			10,511
	Provision for loan losses	(271		)		78				4,036			—			3,843
	Ending balance	$	101,989			124,843				42,544			—			269,376
	Ending balance: individually evaluated for impairment	22,107				15,863				1,195			—			39,165
	Ending balance: collectively evaluated for impairment	$	79,882			108,980				41,349			—			230,211
	Loans:
	Ending balance: total loans(1)	$	6,745,379			10,017,075				3,854,961			—			20,617,415
	Ending balance: individually evaluated for impairment	317,011				172,860				47,669			—			537,540
	Ending balance: collectively evaluated for impairment	$	6,428,368			9,844,215				3,807,292			—			20,079,875
		As Of and For The Three Months Ended September 30, 2013
	(in thousands)	Commercial Real Estate				Commercial & Industrial				Retail			Unallocated			Total
	Allowance for loan losses:
	Beginning balance	$	138,329			133,190				40,361			23,000			334,880
	Charge-offs	(9,474		)		(13,871		)		(6,908	)		—			(30,253	)
	Recoveries	2,766				2,152				2,306			—			7,224
	Provision (credit) for loan losses	5,562				(2,352		)		3,551			—			6,761
	Ending balance	$	137,183			$	119,119			39,310			23,000			318,612
	Ending balance: individually evaluated for impairment	50,737				25,194				2,120			—			78,051
	Ending balance: collectively evaluated for impairment	$	86,446			93,925				37,190			23,000			240,561
	Loans:
	Ending balance: total loans(2)	$	6,458,518			9,705,425				3,572,669			—			19,736,612
	Ending balance: individually evaluated for impairment	569,128				259,764				53,061			—			881,953
	Ending balance: collectively evaluated for impairment	$	5,889,390			9,445,661				3,519,608			—			18,854,659
(1)Total before net deferred fees and costs of $28.8 million.
(2)Total before net deferred fees and costs of $25.0 million.
Schedule of Impaired Loans	'
	The allowance for loan losses continues to consist of an allocated component (which includes the qualitative factors noted above as well as the qualitative factors disclosed in Synovus' 2013 Form 10-K) and an unallocated component. Beginning March 31, 2014, the unallocated component relates to risk elements, if any, which are not already included in the allocated allowance.
	The tables below summarize impaired loans (including accruing TDRs) as of September 30, 2014 and December 31, 2013.
	Impaired Loans (including accruing TDRs)
		September 30, 2014										Nine Months Ended						Three Months Ended September 30, 2014
												30-Sep-14
	(in thousands)	Recorded Investment				Unpaid Principal Balance			Related Allowance			Average Recorded Investment			Interest Income Recognized			Average Recorded Investment		Interest Income Recognized
	With no related allowance recorded
	Investment properties	$	33,849			46,096			—			24,949			—			33,167		—
	1-4 family properties	4,386				12,251			—			5,984			—			4,151		—
	Land acquisition	29,501				76,068			—			31,187			—			29,584		—
	Total commercial real estate	67,736				134,415			—			62,120			—			66,902		—
	Commercial, financial and agricultural	5,705				12,109			—			9,917			—			6,785		—
	Owner-occupied	15,300				17,512			—			21,024			—			17,942		—
	Total commercial and industrial	21,005				29,621			—			30,941			—			24,727		—
	Home equity lines	—				—			—			—			—			—		—
	Consumer mortgages	995				2,065			—			1,471			—			1,869		—
	Credit cards	—				—			—			—			—			—		—
	Other retail	—				—			—			—			—			—		—
	Total retail	995				2,065			—			1,471			—			1,869		—
	Total impaired loans with no	$	89,736			166,101			—			94,532			—			93,498		—
	related allowance recorded
	With allowance recorded
	Investment properties	117,707				119,560			6,621			141,128			3,034			118,729		961
	1-4 family properties	83,797				84,588			10,694			99,038			2,209			87,829		613
	Land acquisition	47,771				47,914			4,792			102,880			1,264			48,499		418
	Total commercial real estate	249,275				252,062			22,107			343,046			6,507			255,057		1,992
	Commercial, financial and agricultural	81,036				85,771			12,532			97,143			1,877			82,271		553
	Owner-occupied	70,819				70,842			3,331			83,392			2,029			80,653		601
	Total commercial and industrial	151,855				156,613			15,863			180,535			3,906			162,924		1,154
	Home equity lines	3,822				3,822			68			3,253			71			3,809		40
	Consumer mortgages	37,591				37,591			1,029			40,582			999			39,217		457
	Credit cards	—				—			—			—			—			—		—
	Other retail	5,261				5,261			98			4,892			228			5,171		88
	Total retail	46,674				46,674			1,195			48,727			1,298			48,197		585
	Total impaired loans with	$	447,804			455,349			39,165			572,308			11,711			466,178		3,731
	allowance recorded
	Total impaired loans
	Investment properties	$	151,556			165,656			6,621			166,077			3,034			151,896		961
	1-4 family properties	88,183				96,839			10,694			105,022			2,209			91,980		613
	Land acquisition	77,272				123,982			4,792			134,067			1,264			78,083		418
	Total commercial real estate	317,011				386,477			22,107			405,166			6,507			321,959		1,992
	Commercial, financial and agricultural	86,741				97,880			12,532			107,060			1,877			89,056		553
	Owner-occupied	86,119				88,354			3,331			104,416			2,029			98,595		601
	Total commercial and industrial	172,860				186,234			15,863			211,476			3,906			187,651		1,154
	Home equity lines	3,822				3,822			68			3,253			71			3,809		40
	Consumer mortgages	38,586				39,656			1,029			42,053			999			41,086		457
	Credit cards	—				—			—			—			—			—		—
	Other retail	5,261				5,261			98			4,892			228			5,171		88
	Total retail	47,669				48,739			1,195			50,198			1,298			50,066		585
	Total impaired loans	$	537,540			621,450			39,165			666,840			11,711			559,676		3,731
	Impaired Loans (including accruing TDRs)
		December 31, 2013										Year Ended December 31, 2013
	(in thousands)	Recorded Investment				Unpaid Principal Balance			Related Allowance			Average Recorded Investment			Interest Income Recognized
	With no related allowance recorded
	Investment properties	$	14,218			15,820			—			18,046			—
	1-4 family properties	9,679				29,741			—			23,879			—
	Land acquisition	30,595				78,470			—			41,007			—
	Total commercial real estate	54,492				124,031			—			82,932			—
	Commercial, financial and agricultural	13,490				22,312			—			15,355			—
	Owner-occupied	24,839				32,626			—			22,472			—
	Total commercial and industrial	38,329				54,938			—			37,827			—
	Home equity lines	—				—			—			33			—
	Consumer mortgages	1,180				2,840			—			1,487			—
Credit cards	—				—			—			—			—
Other retail	—				—			—			4			—
Total retail	1,180				2,840			—			1,524			—
Total impaired loans with no	$	94,001			181,809			—			122,283			—
related allowance recorded
With allowance recorded
Investment properties	$	186,058			193,765			8,863			227,073			5,062
1-4 family properties	115,151				117,498			11,135			115,629			3,464
Land acquisition	183,029				202,048			26,789			191,807			2,931
Total commercial real estate	484,238				513,311			46,787			534,509			11,457
Commercial, financial and agricultural	115,532				120,290			15,559			128,680			3,630
Owner-occupied	89,001				94,869			4,459			107,949			3,656
Total commercial and industrial	204,533				215,159			20,018			236,629			7,286
Home equity lines	2,750				2,750			116			4,668			176
Consumer mortgages	44,019				44,019			967			48,674			1,910
Credit cards	—				—			—			—			—
Other retail	7,013				7,013			109			5,555			285
Total retail	53,782				53,782			1,192			58,897			2,371
Total impaired loans with	$	742,553			782,252			67,997			830,035			21,114
allowance recorded
Total impaired loans
Investment properties	$	200,276			209,585			8,863			245,119			5,062
1-4 family properties	124,830				147,239			11,135			139,508			3,464
Land acquisition	213,624				280,518			26,789			232,814			2,931
Total commercial real estate	538,730				637,342			46,787			617,441			11,457
Commercial, financial and agricultural	129,022				142,602			15,559			144,035			3,630
Owner-occupied	113,840				127,495			4,459			130,421			3,656
Total commercial and industrial	242,862				270,097			20,018			274,456			7,286
Home equity lines	2,750				2,750			116			4,701			176
Consumer mortgages	45,199				46,859			967			50,161			1,910
Credit cards	—				—			—			—			—
Other retail	7,013				7,013			109			5,559			285
Total retail	54,962				56,622			1,192			60,421			2,371
Total impaired loans	$	836,554			964,061			67,997			952,318			21,114
Troubled Debt Restructurings	'
	The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the nine and three months ended September 30, 2014 and 2013 that were reported as accruing or non-accruing TDRs.
	TDRs by Concession Type
		Nine Months Ended September 30, 2014
	(in thousands, except contract data)	Number of Contracts			Principal Forgiveness				Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
	Investment properties	14			$	—			8,423			5,598			14,021
	1-4 family properties	36			—				2,390			3,859			6,249
	Land acquisition	15			2,338				4,721			2,688			9,747
	Total commercial real estate	65			2,338				15,534			12,145			30,017
	Commercial, financial and agricultural	68			60				7,639			16,977			24,676
	Owner-occupied	14			—				22,178			14,392			36,570
	Total commercial and industrial	82			60				29,818			31,369			61,247
	Home equity lines	11			—				1,163			451			1,614
	Consumer mortgages	13			—				2,296			315			2,611
	Credit cards	—			—				—			—			—
	Other retail	17			—				543			385			928
	Total retail	41			—				4,002			1,151			5,153
	Total TDRs	188			$	2,398			49,354			44,665			96,417		(1	)
		Three Months Ended September 30, 2014
	(in thousands, except contract data)	Number of Contracts			Principal Forgiveness				Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
	Investment properties	4			$	—			875			3,899			4,774
	1-4 family properties	7			—				879			203			1,082
	Land acquisition	3			2,338				204			646			3,188
	Total commercial real estate	14			2,338				1,958			4,748			9,044
	Commercial, financial and agricultural	28			60				3,098			5,280			8,438
	Owner-occupied	2			—				2,703			130			2,833
	Total commercial and industrial	30			60				5,802			5,410			11,272
	Home equity lines	5			—				435			—			435
	Consumer mortgages	5			—				543			212			755
	Credit cards	—			—				—						—
	Other retail	7			—				101			150			251
	Total retail	17			—				1,079			362			1,441
	Total TDRs	61			$	2,398			8,839			10,520			21,757		(2	)
	(1) Net charge-offs of $163 thousand were recorded during the nine months ended September 30, 2014 upon restructuring of these loans.
	(2) Net charge-offs of $163 thousand were recorded during the three months ended September 30, 2014 upon restructuring of these loans.
	TDRs by Concession Type
		Nine Months Ended September 30, 2013
	(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
	Investment properties	44			—			121,263			4,372			125,635
	1-4 family properties	99			424			28,863			8,629			37,916
	Land acquisition	26			74			113,627			9,763			123,464
	Total commercial real estate	169			498			263,753			22,764			287,015
	Commercial, financial and agricultural	85			183			21,600			12,675			34,458
	Owner-occupied	51			—			21,571			22,935			44,506
	Total commercial and industrial	136			183			43,171			35,610			78,964
	Home equity lines	1			—			—			80			80
	Consumer mortgages	123			—			10,230			4,004			14,234
	Credit cards	—			—			—			—			—
	Other retail	56			—			879			1,424			2,303
	Total retail	180			—			11,109			5,508			16,617
	Total TDRs	485			681			318,033			63,882			382,596		(1	)
		Three Months Ended September 30, 2013
	(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate			Term Extensions and/or Other Concessions			Total
	Investment properties	13			—			74,111			—			74,111
	1-4 family properties	41			—			4,832			2,133			6,965
	Land acquisition	10			—			108,295			2,532			110,827
	Total commercial real estate	64			—			187,238			4,665			191,903
	Commercial, financial and agricultural	16			—			3,152			2,737			5,889
	Owner-occupied	12			—			5,575			7,940			13,515
	Total commercial and industrial	28			—			8,727			10,677			19,404
	Home equity lines	—			—			—			—			—
	Consumer mortgages	39			—			3,106			966			4,072
	Credit cards	—			—			—			—			—
	Other retail	18			—			419			396			815
Total retail	57			—			3,525			1,362			4,887
Total TDRs	149			—			199,490			16,704			216,194		(2	)
(1) Net charge-offs of $199 thousand were recorded during the nine months ended September 30, 2013 upon restructuring of these loans.
(2) Net charge-offs of $146 thousand were recorded during the three months ended September 30, 2013 upon restructuring of these loans.
Troubled Debt Restructurings that Subsequently Defaulted	'
	The following table presents TDRs that defaulted in the periods indicated and which were modified or renewed in a TDR within 12 months of the default date.
	Troubled Debt Restructurings Entered Into That Subsequently Defaulted* During
		Nine Months Ended September 30, 2014							Three Months Ended September 30, 2014
	(in thousands, except contract data)	Number of			Recorded				Number of			Recorded
		Contracts			Investment				Contracts			Investment
	Investment properties	1			$	186			—			$	—
	1-4 family properties	3			1,018				—			—
	Land acquisition	1			428				—			—
	Total commercial real estate	5			1,632				—			—
	Commercial, financial and agricultural	4			1,559				2			181
	Owner-occupied	—			—				—			—
	Total commercial and industrial	4			1,559				2			181
	Home equity lines	—			—				—			—
	Consumer mortgages	3			206				2			136
	Credit cards	—			—				—			—
	Other retail	—			—				—			—
	Total retail	3			206				2			136
	Total TDRs	12			$	3,397			4			$	317
	* Default is defined as the earlier of the troubled debt restructuring being placed on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments.
	Troubled Debt Restructurings Entered Into That Subsequently Defaulted* During
		Nine Months Ended September 30, 2013							Three Months Ended September 30, 2013
	(in thousands, except contract data)	Number of			Recorded				Number of			Recorded
		Contracts			Investment				Contracts			Investment
	Investment properties	2			$	4,519			—			$	—
	1-4 family properties	9			12,374				1			1,620
	Land acquisition	1			126				—			—
	Total commercial real estate	12			17,019				1			1,620
	Commercial, financial and agricultural	3			409				—			—
	Owner-occupied	2			924				—			—
	Total commercial and industrial	5			1,333				—			—
	Home equity lines	1			98				1			98
	Consumer mortgages	15			1,195				2			217
	Credit cards	—			—				—			—
	Other retail	1			195				—			—
	Total retail	17			1,488				3			315
	Total TDRs	34			$	19,840			4			$	1,935
	* Default is defined as the earlier of the troubled debt restructuring being placed on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments.

Other_Comprehensive_Income_Los1

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)	'
	The following table illustrates activity within the balances in accumulated other comprehensive income (loss) by component, and is shown for the nine and three months ended September 30, 2014 and 2013.
	Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)
	(in thousands)	Net unrealized gains (losses) on cash flow hedges				Net unrealized gains (losses) on investment securities available for sale		Post-retirement unfunded health benefit		Total
	Balance as of December 31, 2013	$	(13,099	)		(28,936	)	777		(41,258	)
	Other comprehensive income before reclassifications	—				16,888		243		17,131
	Amounts reclassified from accumulated other comprehensive income (loss)	206				(818	)	(88	)	(700	)
	Net current period other comprehensive income (loss)	206				16,070		155		16,431
	Balance as of September 30, 2014	$	(12,893	)		(12,866	)	932		(24,827	)
	Balance as of July 1, 2014	$	(12,962	)		(1,686	)	932		(13,716	)
	Other comprehensive income before reclassifications	—				(11,180	)	—		(11,180	)
	Amounts reclassified from accumulated other comprehensive income (loss)	69				—		—		69
	Net current period other comprehensive income (loss)	69				(11,180	)	—		(11,111	)
	Balance as of September 30, 2014	$	(12,893	)		(12,866	)	932		(24,827	)
	Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)
	(in thousands)	Net unrealized gains (losses) on cash flow hedges				Net unrealized gains (losses) on investment securities available for sale		Post-retirement unfunded health benefit		Total
	Balance as of December 31, 2012	$	(13,373	)		17,111		363		4,101
	Other comprehensive income (loss) before reclassifications	—				(32,698	)	519		(32,179	)
	Amounts reclassified from accumulated other comprehensive income (loss)	205				(1,581	)	(60	)	(1,436	)
	Net current period other comprehensive income (loss)	205				(34,279	)	459		(33,615	)
	Balance as of September 30, 2013	$	(13,168	)		(17,168	)	822		(29,514	)
	Balance as of July 1, 2013	$	(13,237	)		(20,689	)	866		(33,060	)
	Other comprehensive income (loss) before reclassifications	—				4,212		—		4,212
	Amounts reclassified from accumulated other comprehensive income (loss)	69				(691	)	(44	)	(666	)
	Net current period other comprehensive income (loss)	69				3,521		(44	)	3,546
	Balance as of September 30, 2013	$	(13,168	)		(17,168	)	822		(29,514	)
Schedule of Reclassifications out of Accumulated Other Comprehensive Income (Loss)	'
	The following table illustrates activity within the reclassifications out of accumulated other comprehensive income (loss), for the nine and three months ended September 30, 2014 and 2013.
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	For the Nine Months Ended September 30, 2014
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(336	)		Interest expense
			130				Income tax (expense) benefit
			$	(206	)		Reclassifications, net of income taxes
	Net unrealized gains (losses) on investment securities available for sale:
	Realized gain on sale of securities		$	1,331			Investment securities gains, net
			(513		)		Income tax (expense) benefit
			$	818			Reclassifications, net of income taxes
	Post-retirement unfunded health benefit:
	Amortization of actuarial gains		$	144			Salaries and other personnel expense
			(56		)		Income tax (expense) benefit
			$	88			Reclassifications, net of income taxes
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	For the Three Months Ended September 30, 2014
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(112	)		Interest expense
			43				Income tax (expense) benefit
			$	(69	)		Reclassifications, net of income taxes
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	For the Nine Months Ended September 30, 2013
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(336	)		Interest expense
			131				Income tax (expense) benefit
			$	(205	)		Reclassifications, net of income taxes
	Net unrealized gains (losses) on investment securities available for sale:
	Realized gain on sale of securities		$	2,571			Investment securities gains, net
			(990		)		Income tax (expense) benefit
			$	1,581			Reclassifications, net of income taxes
	Post-retirement unfunded health benefit:
	Amortization of actuarial gains		$	98			Salaries and other personnel expense
			(38		)		Income tax (expense) benefit
			$	60			Reclassifications, net of income taxes
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	For the Three Months Ended September 30, 2013
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(112	)		Interest expense
			43				Income tax (expense) benefit
			$	(69	)		Reclassifications, net of income taxes
	Net unrealized gains (losses) on investment securities available for sale:
	Realized gain on sale of securities		$	1,124			Investment securities gains, net
			(433		)		Income tax (expense) benefit
			$	691			Reclassifications, net of income taxes
	Post-retirement unfunded health benefit:
	Amortization of actuarial gains		$	72			Salaries and other personnel expense
			(28		)		Income tax (expense) benefit
			$	44			Reclassifications, net of income taxes

Fair_Value_Accounting_Tables

Fair Value Accounting (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Financial Instruments Measured at Fair Value on Recurring Basis	'
	The following table presents all financial instruments measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013, according to the valuation hierarchy included in ASC 820-10. For equity and debt securities, class was determined based on the nature and risks of the investments.
		September 30, 2014
	(in thousands)	Level 1				Level 2			Level 3		Total Assets and Liabilities at Fair Value
	Assets
	Trading securities:
	Mortgage-backed securities issued by U.S. Government agencies	$	—			3,502			—		3,502
	Collateralized mortgage obligations issued by	—				3,677			—		3,677
	U.S. Government sponsored enterprises
	State and municipal securities	—				—			—		—
	All other mortgage-backed	—				4,174			—		4,174
	securities
	Other investments	97				1,255			—		1,352
	Total trading securities	$	97			12,608			—		12,705
	Mortgage loans held for sale	—				72,333			—		72,333
	Investment securities available for sale:
	U.S. Treasury securities	42,668				—			—		42,668
	U.S. Government agency securities	—				27,469			—		27,469
	Securities issued by U.S. Government sponsored enterprises	—				82,327			—		82,327
	Mortgage-backed securities issued by U.S. Government agencies	—				177,395			—		177,395
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,316,608			—		2,316,608
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				373,459			—		373,459
	State and municipal securities	—				5,301			—		5,301
	Equity securities	6,357				—			—		6,357
	Other investments(1)	2,006				14,882			1,785		18,673
	Total investment securities available for sale	$	51,031			2,997,441			1,785		3,050,257
	Private equity investments	—				1,094			27,232		28,326
	Mutual funds held in Rabbi Trusts	10,817				—			—		10,817
	Derivative assets:
	Interest rate contracts	—				30,184			—		30,184
	Mortgage derivatives(2)	—				1,138			—		1,138
	Total derivative assets	$	—			31,322			—		31,322
	Liabilities
	Trading account liabilities	—				6,264			—		6,264
	Salary stock units	728				—			—		728
	Derivative liabilities:
	Interest rate contracts	—				30,689			—		30,689
	Mortgage derivatives(2)	—				320			—		320
	Visa derivative	—				—			4,021		4,021
	Total derivative liabilities	$	—			31,009			4,021		35,030
		December 31, 2013
	(in thousands)	Level 1				Level 2			Level 3		Total Assets and Liabilities at Fair Value
	Assets
	Trading securities:
	Collateralized mortgage obligations issued by U.S. Government sponsored enterprises	—				2,465			—		2,465
	State and municipal securities	—				429			—		429
	All other mortgage-backed securities	—				968			—		968
	Other investments	—				2,251			—		2,251
	Total trading securities	$	—			6,113			—		6,113
	Mortgage loans held for sale	—				45,384			—		45,384
	Investment securities available for sale:
	U.S. Treasury securities	17,791				—			—		17,791
	U.S. Government agency securities	—				34,641			—		34,641
	Securities issued by U.S. Government sponsored enterprises	—				113,745			—		113,745
	Mortgage-backed securities issued by U.S. Government agencies	—				195,117			—		195,117
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,421,360			—		2,421,360
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				398,540			—		398,540
	State and municipal securities	—				6,889			—		6,889
	Equity securities	6,956				—			628		7,584
	Other investments(1)	1,969				—			1,722		3,691
	Total investment securities available for sale	$	26,716			3,170,292			2,350		3,199,358
	Private equity investments	—				1,615			27,745		29,360
	Mutual funds held in Rabbi Trusts	11,246				—			—		11,246
	Derivative assets:
Interest rate contracts	—				38,482			—		38,482
Mortgage derivatives(2)	—				1,522			—		1,522
Total derivative assets	$	—			40,004			—		40,004
Liabilities
Trading account liabilities	—				1,763			—		1,763
Salary stock units	1,764				—			—		1,764
Derivative liabilities:
Interest rate contracts	—				39,436			—		39,436
Visa derivative	—				—			2,706		2,706
Total derivative liabilities	$	—			39,436			2,706		42,142
(1) Based on an analysis of the nature and risks of these investments, Synovus has determined that presenting these investments as a single asset class is appropriate.
(2) Mortgage derivatives consist of customer interest rate lock commitments that relate to the potential origination of mortgage loans, which would be classified as held for sale and forward loan sales commitments with third party investors.
Changes in Fair Value Included in Consolidated Statements of Income	'
	The following table summarizes the difference between the fair value and the unpaid principal balance of mortgage loans held for sale measured at fair value and the changes in fair value of these loans. Mortgage loans held for sale are initially measured at fair value with subsequent changes in fair value recognized in earnings. Changes in fair value were recorded as a component of mortgage banking income in the consolidated statements of income. An immaterial portion of these changes in fair value was attributable to changes in instrument-specific credit risk.
	Changes in Fair Value Included in Net Income
		For the Nine Months Ended September 30,					For the Three Months Ended September 30,
	(in thousands)	2014		2013			2014			2013
	Mortgage loans held for sale	$969		(3,838	)		(813	)		4,092
	Mortgage Loans Held for Sale
	(in thousands)	As of September 30, 2014				As of December 31, 2013
	Fair value	$	72,333			45,384
	Unpaid principal balance	70,924				44,943
	Fair value less aggregate unpaid principal balance	$	1,409			441
Changes in Level 3 Fair Value Measurements	'
		Nine Months Ended September 30,
		2014									2013
	(in thousands)	Investment Securities Available for Sale				Private Equity Investments			Other Derivative		Investment Securities Available for Sale		Private Equity Investments		Other Derivative
									Contracts, Net						Contracts, Net
	Beginning balance, January 1,	$	2,350			27,745			(2,706	)	$3,178		30,708		(2,956	)
	Total gains (losses) realized/unrealized:
	Included in earnings*	(88		)		(513	)		(2,731	)	—		(856	)	(801	)
	Unrealized gains (losses) included in other comprehensive income	63				—			—		401		—		—
	Purchases	—							—		—		—		—
	Sales	—				—			—		—		—		—
	Issuances	—				—			—		—		—		—
	Settlements	(540		)		—			1,416		—		—		1,252
	Amortization of discount/premium	—				—			—		—		—		—
	Transfers in and/or out of Level 3	—				—			—		—		—		—
	Ending balance, September 30,	$	1,785			27,232			(4,021	)	3,579		29,852		(2,505	)
	Total net gains (losses) for the nine months included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at September 30,	$	(88	)		(513	)		(2,731	)	—		(856	)	(801	)
	* Included in earnings as a component of non-interest income (expense).
		Three Months Ended September 30,
		2014									2013
	(in thousands)	Investment Securities Available for Sale				Private Equity Investments			Other Derivative		Investment Securities Available for Sale		Private Equity Investments		Other Derivative
									Contracts, Net						Contracts, Net
	Beginning balance, July 1,	$	1,866			27,376			(2,438	)	3,454		29,568		(2,977	)
	Total gains (losses) realized/unrealized:
	Included in earnings*	—				(144	)		(1,979	)	—		284		—
	Unrealized gains (losses) included in other comprehensive income	(81		)		—			—		125		—		—
	Purchases	—				—			—		—		—		—
	Sales	—				—			—		—		—		—
	Issuances	—				—			—		—		—		—
	Settlements	—				—			396		—		—		472
	Amortization of discount/premium	—				—			—		—		—		—
	Transfers in and/or out of Level 3	—				—			—		—		—		—
	Ending balance, September 30,	$	1,785			27,232			(4,021	)	3,579		29,852		(2,505	)
	Total net gains (losses) for the three months included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at September 30,	$	—			(144	)		(1,979	)	—		284		—
	* Included in earnings as a component of non-interest income (expense).
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis	'
		September 30, 2014											December 31, 2013
	(in thousands)	Level 1				Level 2			Level 3		Total		Level 1		Level 2		Level 3	Total
	Impaired loans*	$	—			—			37,790		37,790		—		—		170,693	170,693
	Other loans held for sale	—				—			338		338		—		—		9,670	9,670
	Other real estate	—				—			25,928		25,928		—		—		50,070	50,070
	Other assets held for sale	$	—			—			7,744		7,744		—		—		4,945	4,945
Assets Measured at Fair Value on a Nonrecurring Basis	'
	The following table presents fair value adjustments recognized for the nine and three months ended September 30, 2014 and 2013 for the assets measured at fair value on a non-recurring basis.
		Nine Months Ended September 30,							Three Months Ended September 30,
	(in thousands)	2014				2013			2014			2013
	Impaired loans*	$	20,661			27,624			$	9,380		4,630
	Other loans held for sale	285				2,844			285			2,833
	Other real estate	7,343				5,919			4,114			1,406
	Other assets held for sale	$	7,608			246			$	100		76
	* Impaired loans that are collateral-dependent.
Fair Value Inputs, Assets, Quantitative Information	'
	September 30, 2014
	(dollars in thousands)		Level 3 Fair Value			Valuation Technique	Significant Unobservable Input	Range
								(Weighted Average)(1)
	Assets measured at fair
	value on a recurring basis
	Investment Securities Available for Sale:
	Other Investments:
	Trust preferred securities		1,785			Discounted cash flow analysis	Credit spread embedded in discount rate	450-550 bps (500 bps)
	Private equity investments		27,232			Individual analysis of each investee company	Multiple factors, including but not limited to, current operations, financial condition, cash flows, evaluation of business management and financial plans, and recently executed financing transactions related to the investee companies	N/A
	Visa derivative liability		4,021			Internal valuation	Multiple factors, including but not limited to, 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.	N/A
	September 30, 2014
	(dollars in thousands)		Level 3 Fair Value				Valuation Technique	Significant Unobservable Input	Range
									(Weighted Average)(1)
	Assets measured at fair
	value on a non-recurring basis
	Collateral dependent impaired loans		$	37,790			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0% - 100% (48%)
								Estimated selling costs	0% - 10% (7%)
	Other loans held for sale		338				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0% - 23% (23%)
								Estimated selling costs	0% - 10% (7%)
	Other real estate		25,928				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0% - 38% (16%)
								Estimated selling costs	0% - 10% (7%)
	Other assets held for sale		7,744				Third party appraised value of collateral less estimated selling costs or BOV	Discount to appraised value (2)	0%-100% (69%)
								Estimated selling costs	0%-10% (10%)
	(1) The range represents management's best estimate of the high and low of the value that would be assigned to a particular input. For assets measured at fair value on a non-recurring basis, the weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability.
	(2) Synovus also makes adjustments to the values of the assets listed above for various reasons, including age of the appraisal, information known by management about the property, such as occupancy rates, changes to the physical conditions of the property, and other factors.
	December 31, 2013
	(dollars in thousands)		Level 3 Fair Value				Valuation Technique	Significant Unobservable Input	Range (Weighted Average)(1)
	Assets measured at fair
	value on a recurring basis
	Investment Securities Available for Sale:
	Equity securities		$	628			Individual analysis of each investment	Multiple data points, including, but not limited to evaluation of past and projected business performance	N/A(3)
	Other Investments:
	Trust preferred securities		1,722				Discounted cash flow analysis	Credit spread embedded in discount rate	400-480 bps (441 bps)
	Private equity investments		27,745				Individual analysis of each investee company	Multiple factors, including but not limited to, current operations, financial condition, cash flows, evaluation of business management and financial plans, and recently executed company transactions related to the investee companies	N/A
	Visa derivative liability		2,706				Internal valuation	Multiple factors, including but not limited to, 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.	N/A
	December 31, 2013
	(dollars in thousands)		Level 3 Fair Value				Valuation Technique	Significant Unobservable Input	Range
									(Weighted Average)(1)
	Assets measured at fair
	value on a non-recurring basis
	Collateral dependent impaired loans		$	170,693			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-65% (25%)
								Estimated selling costs	0%-10% (7%)
	Other loans held for sale		9,670				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-12% (4%)
								Estimated selling costs	0%-10% (7%)
	Other real estate		50,070				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-7% (2%)
								Estimated selling costs	0%-10% (7%)
	Other assets held for sale		4,945				Third party appraised value of collateral less estimated selling costs or BOV	Discount to appraised value (2)	5%-36% (20%)
								Estimated selling costs	0%-10% (7%)
	(1) The range represents management's best estimate of the high and low of the value that would be assigned to a particular input. For assets measured at fair value on a non-recurring basis, the weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability.
	(2) Synovus also makes adjustments to the values of the assets listed above for various reasons, including age of the appraisal, information known by management about the property, such as occupancy rates, changes to the physical conditions of the property, and other factors.
	(3) The range has not been disclosed due to the wide range of possible values given the methodology used.
Carrying and Estimated Fair Values of Financial Instruments Carried on Balance Sheet	'
	The carrying and estimated fair values of financial instruments, as well as the level within the fair value hierarchy, as of September 30, 2014 and December 31, 2013 are as follows:
		September 30, 2014
	(in thousands)	Carrying Value				Estimated Fair Value			Level 1		Level 2		Level 3
	Financial assets
	Cash and cash equivalents	$	386,402			386,402			386,402		—		—
	Interest bearing funds with Federal Reserve Bank	750,446				750,446			750,446		—		—
	Interest earning deposits with banks	13,612				13,612			13,612		—		—
	Federal funds sold and securities purchased under resale agreements	70,918				70,918			70,918		—		—
	Trading account assets	12,705				12,705			97		12,608		—
	Mortgage loans held for sale	72,333				72,333			—		72,333		—
	Other loans held for sale	338				338			—		—		338
	Investment securities available for sale	3,050,257				3,050,257			51,031		2,997,441		1,785
	Private equity investments	28,326				28,326			—		1,094		27,232
	Mutual funds held in Rabbi Trusts	10,817				10,817			10,817		—		—
	Loans, net of deferred fees and costs	20,588,566				20,334,382			—		—		20,334,382
	Derivative assets	31,322				31,322			—		31,322		—
	Financial liabilities
	Trading account liabilities	6,264				6,264			—		6,264		—
	Non-interest bearing deposits	5,813,809				5,813,809			—		5,813,809		—
	Interest bearing deposits	15,175,972				15,177,126			—		15,177,126		—
	Federal funds purchased and securities sold under repurchase agreements	107,160				107,160			107,160		—		—
	Salary stock units	728				728			728		—		—
	Long-term debt	2,130,934				2,185,455			—		2,185,455		—
	Derivative liabilities	$	35,030			35,030			—		31,009		4,021
		December 31, 2013
	(in thousands)	Carrying Value				Estimated Fair Value			Level 1		Level 2		Level 3
	Financial assets
	Cash and cash equivalents	$	469,630			469,630			469,630		—		—
	Interest bearing funds with Federal Reserve Bank	644,528				644,528			644,528		—		—
	Interest earning deposits with banks	24,325				24,325			24,325		—		—
	Federal funds sold and securities purchased under resale agreements	80,975				80,975			80,975		—		—
	Trading account assets	6,113				6,113			—		6,113		—
	Mortgage loans held for sale	45,384				45,384			—		45,384		—
	Other loans held for sale	10,685				10,685			—		—		10,685
	Investment securities available for sale	3,199,358				3,199,358			26,716		3,170,292		2,350
	Private equity investments	29,360				29,360			—		1,615		27,745
	Mutual funds held in Rabbi Trusts	11,246				11,246			11,246		—		—
	Loans, net of deferred fees and costs	20,057,798				19,763,708			—		—		19,763,708
	Derivative assets	40,004				40,004			—		40,004		—
	Financial liabilities
	Trading account liabilities	1,763				1,763			—		1,763		—
	Non-interest bearing deposits	5,642,751				5,642,751			—		5,642,751		—
	Interest bearing deposits	15,234,039				15,244,020			—		15,244,020		—
	Federal funds purchased and securities sold under repurchase agreements	148,132				148,132			148,132		—		—
	Salary stock units	1,764				1,764			1,764		—		—
	Long-term debt	2,033,141				2,095,720			—		2,095,720		—
	Derivative liabilities	$	42,142			42,142			—		39,436		2,706

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Summary of Derivative Instruments [Abstract]	'
Impact of Derivatives on Balance Sheet	'
	The impact of derivative instruments on the consolidated balance sheets at September 30, 2014 and December 31, 2013 is presented below.
		Fair Value of Derivative Assets						Fair Value of Derivative Liabilities
	(in thousands)	Location on Consolidated Balance Sheet	September 30, 2014			December 31, 2013		Location on Consolidated Balance Sheet	September 30, 2014		December 31, 2013
	Derivatives not designated
	as hedging instruments:
	Interest rate contracts	Other assets	$	30,184		38,482		Other liabilities	$	30,689	39,436
	Mortgage derivatives	Other assets	1,138			1,522		Other liabilities	320		—
	Visa derivative		—			—		Other liabilities	4,021		2,706
	Total derivatives not		$	31,322		40,004			$	35,030	42,142
	designated as hedging
	instruments
Effect of Fair Value Hedges on Consolidated Statements of Income	'
	The pre-tax effect of fair value hedges on the consolidated statements of income for the nine and three months ended September 30, 2014 and 2013 is presented below.
		Location of Gain (Loss) Recognized in Income	Gain (Loss) Recognized in Income
	(in thousands)		Nine Months Ended September 30,
	Derivatives not designated as hedging instruments		2014			2013
	Interest rate contracts(1)	Other non-interest income	449			63
	Mortgage derivatives(2)	Mortgage banking income	(704		)	(1,865	)
	Total		$	(255	)	(1,802	)
		Location of Gain (Loss) Recognized in Income	Gain (Loss) Recognized in Income
	(in thousands)		Three Months Ended September 30,
	Derivatives not designated as hedging instruments		2014			2013
	Interest rate contracts(1)	Other non-interest income	65			221
	Mortgage derivatives(2)	Mortgage banking income	51			(6,806	)
	Total		$	116		(6,585	)
	(1) Gain (loss) represents net fair value adjustments (including credit related adjustments) for customer swaps and offsetting positions.
	(2) Gain (loss) represents net fair value adjustments recorded for interest rate lock commitments and commitments to sell mortgage loans to third party investors.

Net_Income_Per_Common_Share_Ta

Net Income Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Basic And Diluted Earnings per Share	'
	The following table displays a reconciliation of the information used in calculating basic and diluted earnings per common share for the nine and three months ended September 30, 2014 and 2013.
		Nine Months Ended September 30,			Three Months Ended September 30,
	(in thousands, except per share data)	2014		2013	2014	2013
	Basic Net Income Per Common Share:
	Net income available to common shareholders	$	134,399	82,704	44,229	37,188
	Weighted average common shares outstanding	138,989		123,652	139,043	136,671
	Basic net income per common share	$	0.97	0.67	0.32	0.27
	Diluted Net Income Per Common Share:
	Net income available to common shareholders	$	134,399	82,704	44,229	37,188
	Weighted average common shares outstanding	138,989		123,652	139,043	136,671
	Potentially dilutive shares from assumed exercise of	611		8,823	683	426
	securities or other contracts to purchase Common Stock
	Weighted average diluted common shares	139,600		132,476	139,726	137,097
	Diluted net income per common share	$	0.96	0.62	0.32	0.27

Significant_Accounting_Policie2

Significant Accounting Policies (Details) (Cash and Cash Equivalents [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Member]	'	'
Basis Of Presentation [Line Items]	'	'
Cash and cash equivalents	$91,300,000	$104,900,000
Total deposits	125,000	375,000
Interest earning deposits with banks	7,100,000	11,100,000
Federal funds sold	$68,100,000	$72,200,000

Share_Repurchase_Program_Detai

Share Repurchase Program (Details) (Subsequent Event [Member], Maximum [Member], USD $)	0 Months Ended
	Oct. 21, 2014
Subsequent Event [Member] | Maximum [Member]	'
Equity, Class of Treasury Stock [Line Items]	'
Authorized amount	$250,000,000

Subsequent_Event_Reverse_Stock

Subsequent Event - Reverse Stock Split and Increase in Number of Authorized Common Shares (Narrative) (Details)	0 Months Ended
	Apr. 24, 2014	Sep. 30, 2014	Apr. 23, 2014	Dec. 31, 2013
Reverse Stock Split and Increase in Number of Authorized Common Shares [Abstract]	'	'	'	'
Stock split, conversion ratio	0.1429	'	'	'
Common stock, shares authorized	2,400,000,000	342,857,143	1,200,000,000	342,857,143
Reverse stock splits, shares	342,900,000	'	'	'

Sale_of_Branches_Details

Sale of Branches (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Jan. 17, 2014
			Trust One Bank, Memphis, Tennessee [Member]	Trust One Bank, Memphis, Tennessee [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'
Loans	$20,319,190,000	$19,750,238,000	'	$89,600,000
Deposits	20,989,781,000	20,876,790,000	'	191,300,000
Gain on sale of branches	'	'	$5,800,000	'

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
	securities
Investments [Abstract]	'	'
Pledged to secure deposits	$1,930,000,000	$2,330,000,000
Number of investment securities in a loss portion, less than twelve months	10	'
Number of investment securities in a loss portion, twelve months or longer	50	'
Other-than-temporary impairment charges	$88,000	'

Investment_Securities_Summary_

Investment Securities (Summary Of Available For Sale Investment Securities) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	$3,049,519	[1]	$3,224,749	[1]
Gross Unrealized Gains	24,828		19,170
Gross Unrealized Losses	-24,090		-44,561
Fair Value	3,050,257		3,199,358
U.S. Treasury Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	42,627	[1]	17,791	[1]
Gross Unrealized Gains	41		0
Gross Unrealized Losses	0		0
Fair Value	42,668		17,791
U.S. Government Agency Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	26,435	[1]	33,480	[1]
Gross Unrealized Gains	1,034		1,161
Gross Unrealized Losses	0		0
Fair Value	27,469		34,641
Securities Issued By U.S. Government Sponsored Enterprises [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	81,549	[1]	112,305	[1]
Gross Unrealized Gains	778		1,440
Gross Unrealized Losses	0		0
Fair Value	82,327		113,745
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	176,254	[1]	196,521	[1]
Gross Unrealized Gains	2,074		2,257
Gross Unrealized Losses	-933		-3,661
Fair Value	177,395		195,117
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	2,323,561	[1]	2,443,282	[1]
Gross Unrealized Gains	13,516		9,718
Gross Unrealized Losses	-20,469		-31,640
Fair Value	2,316,608		2,421,360
Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	371,656	[1]	406,717	[1]
Gross Unrealized Gains	4,052		698
Gross Unrealized Losses	-2,249		-8,875
Fair Value	373,459		398,540
State And Municipal Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	5,099	[1]	6,723	[1]
Gross Unrealized Gains	204		168
Gross Unrealized Losses	-2		-2
Fair Value	5,301		6,889
Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	3,228	[1]	3,856	[1]
Gross Unrealized Gains	3,129		3,728
Gross Unrealized Losses	0		0
Fair Value	6,357		7,584
Other Investments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Amortized Cost	19,110	[1]	4,074	[1]
Gross Unrealized Gains	0		0
Gross Unrealized Losses	-437		-383
Fair Value	$18,673		$3,691
[1]	Amortized cost is adjusted for other-than-temporary impairment charges in 2014 and 2013, which have been recognized in the consolidated statements of income in the applicable year, and were considered inconsequential.

Investment_Securities_Schedule

Investment Securities (Schedule Of Unrealized Loss On Investments) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	$247,109	$2,291,995
Less than 12 Months, Unrealized Losses	797	43,983
12 Months or Longer, Fair Value	1,253,241	4,713
12 Months or Longer, Unrealized Losses	23,293	578
Total Fair Value, Fair Value	1,500,350	2,296,708
Total Fair Value, Unrealized Losses	24,090	44,561
U.S. Treasury Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value, Fair Value	0	0
Total Fair Value, Unrealized Losses	0	0
U.S. Government Agency Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value, Fair Value	0	0
Total Fair Value, Unrealized Losses	0	0
Securities Issued By U.S. Government Sponsored Enterprises [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value, Fair Value	0	0
Total Fair Value, Unrealized Losses	0	0
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	9,678	121,607
Less than 12 Months, Unrealized Losses	14	3,363
12 Months or Longer, Fair Value	29,955	2,951
12 Months or Longer, Unrealized Losses	919	298
Total Fair Value, Fair Value	39,633	124,558
Total Fair Value, Unrealized Losses	933	3,661
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	220,542	1,885,521
Less than 12 Months, Unrealized Losses	562	31,640
12 Months or Longer, Fair Value	1,099,220	0
12 Months or Longer, Unrealized Losses	19,907	0
Total Fair Value, Fair Value	1,319,762	1,885,521
Total Fair Value, Unrealized Losses	20,469	31,640
Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	0	282,898
Less than 12 Months, Unrealized Losses	0	8,875
12 Months or Longer, Fair Value	122,239	0
12 Months or Longer, Unrealized Losses	2,249	0
Total Fair Value, Fair Value	122,239	282,898
Total Fair Value, Unrealized Losses	2,249	8,875
State And Municipal Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Longer, Fair Value	43	40
12 Months or Longer, Unrealized Losses	2	2
Total Fair Value, Fair Value	43	40
Total Fair Value, Unrealized Losses	2	2
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value, Fair Value	0	0
Total Fair Value, Unrealized Losses	0	0
Other Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	16,889	1,969
Less than 12 Months, Unrealized Losses	221	105
12 Months or Longer, Fair Value	1,784	1,722
12 Months or Longer, Unrealized Losses	216	278
Total Fair Value, Fair Value	18,673	3,691
Total Fair Value, Unrealized Losses	$437	$383

Investment_Securities_Amortize

Investment Securities (Amortized Cost And Estimated Fair Value By Contractual Maturity Of Investment Securities Available For Sale) (Details) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	$18,407
1 to 5 Years, Amortized Cost	122,537
5 to 10 Years, Amortized Cost	1,940,198
More Than 10 years, Amortized Cost	963,039
No Stated Maturity, Amortized Cost	5,338
Total, Amortized Cost	3,049,519
Within One Year, Fair Value	18,434
1 to 5 Years, Fair Value	123,933
5 to 10 Years, Fair Value	1,926,768
More Than 10 years, Fair Value	972,758
No Stated Maturity, Fair Value	8,364
Total, Fair Value	3,050,257
U.S. Treasury Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	17,793
1 to 5 Years, Amortized Cost	24,834
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	42,627
Within One Year, Fair Value	17,793
1 to 5 Years, Fair Value	24,875
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	42,668
U.S. Government Agency Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	78
1 to 5 Years, Amortized Cost	12,577
5 to 10 Years, Amortized Cost	13,780
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	26,435
Within One Year, Fair Value	80
1 to 5 Years, Fair Value	13,014
5 to 10 Years, Fair Value	14,375
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	27,469
Securities Issued By U.S. Government Sponsored Enterprises [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	81,549
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	81,549
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	82,327
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	82,327
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	5
1 to 5 Years, Amortized Cost	1
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	176,248
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	176,254
Within One Year, Fair Value	5
1 to 5 Years, Fair Value	1
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	177,389
No Stated Maturity, Fair Value	0
Total, Fair Value	177,395
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	431
1 to 5 Years, Amortized Cost	1,605
5 to 10 Years, Amortized Cost	1,926,129
More Than 10 years, Amortized Cost	395,396
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	2,323,561
Within One Year, Fair Value	456
1 to 5 Years, Fair Value	1,707
5 to 10 Years, Fair Value	1,912,088
More Than 10 years, Fair Value	402,357
No Stated Maturity, Fair Value	0
Total, Fair Value	2,316,608
Collateralized Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	371,656
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	371,656
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	373,459
No Stated Maturity, Fair Value	0
Total, Fair Value	373,459
State And Municipal Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	100
1 to 5 Years, Amortized Cost	1,971
5 to 10 Years, Amortized Cost	289
More Than 10 years, Amortized Cost	2,739
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	5,099
Within One Year, Fair Value	100
1 to 5 Years, Fair Value	2,009
5 to 10 Years, Fair Value	305
More Than 10 years, Fair Value	2,887
No Stated Maturity, Fair Value	0
Total, Fair Value	5,301
Securities With No Stated Maturity (Equity Securities) [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	3,228
Total, Amortized Cost	3,228
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	6,357
Total, Fair Value	6,357
Other Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	17,000
No Stated Maturity, Amortized Cost	2,110
Total, Amortized Cost	19,110
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	16,666
No Stated Maturity, Fair Value	2,007
Total, Fair Value	$18,673

Investment_Securities_Summary_1

Investment Securities (Summary Of Sales Transactions In The Investment Securities Available For Sale Portfolio) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments [Abstract]	'	'	'	'
Proceeds from sale and maturity of investment securities available for sale	$0	$56,406	$20,815	$403,792
Gross realized gains	0	1,150	1,419	3,185
Gross realized losses	0	-26	-88	-614
Investment securities gains, net	$0	$1,124	$1,331	$2,571

Restructuring_Charges_Narrativ

Restructuring Charges (Narrative) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
		branches
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'
Restructuring charges	$809,000	'	$8,600,000	$687,000	$17,101,000	$7,295,000
Number of branches identified for future closing	'	13	'	'	'	'
Asset impairment charges	36,000	7,400,000	'	0	7,374,000	0
Accrued liabilities	5,100,000	'	'	'	5,100,000	'
Severance Cost [Member]	'	'	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'
Restructuring charges	'	'	8,000,000	'	'	'
Facility Closing [Member]	'	'	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'
Additional restructuring charges to be incurred in the fourth quarter	$6,000,000	'	'	'	$6,000,000	'

Restructuring_Charges_Schedule

Restructuring Charges (Schedule Of Restructuring And Related Costs) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restructuring Charges [Abstract]	'	'	'	'	'	'
Severance charges	$0	'	'	$701	$8,046	$7,311
Asset impairment charges	36	7,400	'	0	7,374	0
Professional fees and other charges	773	'	'	-14	1,681	-16
Total restructuring charges	$809	'	$8,600	$687	$17,101	$7,295

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'
Increase in allocated allowance	'	'	$23,000,000	'	'	'	'	'
Average recorded investment in impaired loans	537,540,000	881,953,000	537,540,000	881,953,000	'	'	'	'
Interest income recognized	3,731,000	'	11,711,000	0	21,114,000	'	'	'
Average recorded investment in impaired loans	559,676,000	'	666,840,000	'	952,318,000	'	'	'
Interest income recognized for accruing TDRs	3,700,000	5,200,000	11,700,000	16,100,000	'	'	'	'
Accruing troubled debt restructuring	408,700,000	'	408,700,000	'	574,200,000	'	'	'
Allowance for loan losses	269,376,000	318,612,000	269,376,000	318,612,000	307,560,000	277,783,000	334,880,000	373,405,000
Substandard [Member]	'	'	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'
Retail loan substandard period (in days)	'	'	'90 days	'	'	'	'	'
Loss and Charged Off [Member]	'	'	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'
Retail loans downgraded to loss (in days)	'	'	'120 days	'	'	'	'	'
Accruing TDRs With Modifications And Renewals Completed [Member]	'	'	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'
Accruing troubled debt restructuring	408,700,000	'	408,700,000	'	556,400,000	'	'	'
Allowance for loan losses	22,700,000	'	22,700,000	'	27,700,000	'	'	'
Minimum [Member] | Accruing TDRs With Modifications And Renewals Completed [Member]	'	'	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'
Commercial-type impaired loans	'	'	$1,000,000	'	'	'	'	'

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses (Schedule Of Current, Accruing Past Due And Nonaccrual Loans) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	$20,302,321,000		$19,597,760,000		'
Accruing 30-89 Days Past Due	68,645,000		68,111,000		'
Accruing 90 Days or Greater Past Due	4,067,000		4,489,000		'
Total Accruing Past Due	72,712,000		72,600,000		'
Non-accrual	242,382,000		416,300,000		'
Total loans	20,617,415,000	[1]	20,086,660,000	[2]	19,736,612,000
Deferred fees and costs, net	28,800,000		28,900,000		25,000,000
Home Equity Lines [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	1,658,917,000		1,564,578,000		'
Accruing 30-89 Days Past Due	9,656,000		4,919,000		'
Accruing 90 Days or Greater Past Due	524,000		136,000		'
Total Accruing Past Due	10,180,000		5,055,000		'
Non-accrual	16,875,000		17,908,000		'
Total loans	1,685,972,000		1,587,541,000		'
Consumer Mortgages [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	1,574,526,000		1,460,219,000		'
Accruing 30-89 Days Past Due	11,615,000		18,068,000		'
Accruing 90 Days or Greater Past Due	1,004,000		1,011,000		'
Total Accruing Past Due	12,619,000		19,079,000		'
Non-accrual	34,759,000		39,770,000		'
Total loans	1,621,904,000		1,519,068,000		'
Credit Cards [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	250,768,000		253,422,000		'
Accruing 30-89 Days Past Due	1,688,000		1,917,000		'
Accruing 90 Days or Greater Past Due	1,397,000		1,507,000		'
Total Accruing Past Due	3,085,000		3,424,000		'
Non-accrual	0		0		'
Total loans	253,853,000		256,846,000		'
Other Retail Loans [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	288,086,000		280,524,000		'
Accruing 30-89 Days Past Due	2,747,000		2,190,000		'
Accruing 90 Days or Greater Past Due	46,000		26,000		'
Total Accruing Past Due	2,793,000		2,216,000		'
Non-accrual	2,353,000		2,038,000		'
Total loans	293,232,000		284,778,000		'
Investment Properties [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	4,978,360,000		4,546,439,000		'
Accruing 30-89 Days Past Due	1,565,000		3,552,000		'
Accruing 90 Days or Greater Past Due	142,000		40,000		'
Total Accruing Past Due	1,707,000		3,592,000		'
Non-accrual	38,979,000		66,454,000		'
Total loans	5,019,046,000		4,616,485,000		'
1-4 Family Properties [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	1,098,574,000		1,144,447,000		'
Accruing 30-89 Days Past Due	9,759,000		6,267,000		'
Accruing 90 Days or Greater Past Due	103,000		527,000		'
Total Accruing Past Due	9,862,000		6,794,000		'
Non-accrual	29,118,000		33,819,000		'
Total loans	1,137,554,000		1,185,060,000		'
Land Acquisition [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	546,490,000		549,936,000		'
Accruing 30-89 Days Past Due	2,085,000		1,100,000		'
Accruing 90 Days or Greater Past Due	76,000		300,000		'
Total Accruing Past Due	2,161,000		1,400,000		'
Non-accrual	40,128,000		154,095,000		'
Total loans	588,779,000		705,431,000		'
Commercial Real Estate [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	6,623,424,000		6,240,822,000		'
Accruing 30-89 Days Past Due	13,409,000		10,919,000		'
Accruing 90 Days or Greater Past Due	321,000		867,000		'
Total Accruing Past Due	13,730,000		11,786,000		'
Non-accrual	108,225,000		254,368,000		'
Total loans	6,745,379,000		6,506,976,000		'
Commercial, Financial and Agricultural [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	5,935,845,000		5,812,490,000		'
Accruing 30-89 Days Past Due	13,659,000		18,985,000		'
Accruing 90 Days or Greater Past Due	545,000		813,000		'
Total Accruing Past Due	14,204,000		19,798,000		'
Non-accrual	53,360,000		62,977,000		'
Total loans	6,003,409,000		5,895,265,000		'
Owner-Occupied [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	3,970,755,000		3,985,705,000		'
Accruing 30-89 Days Past Due	15,871,000		11,113,000		'
Accruing 90 Days or Greater Past Due	230,000		129,000		'
Total Accruing Past Due	16,101,000		11,242,000		'
Non-accrual	26,810,000		39,239,000		'
Total loans	4,013,666,000		4,036,186,000		'
Commercial and Industrial [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	9,906,600,000		9,798,195,000		'
Accruing 30-89 Days Past Due	29,530,000		30,098,000		'
Accruing 90 Days or Greater Past Due	775,000		942,000		'
Total Accruing Past Due	30,305,000		31,040,000		'
Non-accrual	80,170,000		102,216,000		'
Total loans	10,017,075,000		9,931,451,000		'
Retail [Member]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Current	3,772,297,000		3,558,743,000		'
Accruing 30-89 Days Past Due	25,706,000		27,094,000		'
Accruing 90 Days or Greater Past Due	2,971,000		2,680,000		'
Total Accruing Past Due	28,677,000		29,774,000		'
Non-accrual	53,987,000		59,716,000		'
Total loans	$3,854,961,000		$3,648,233,000		'
[1]	Total before net deferred fees and costs of $28.8 million.
[2]	Total before net deferred fees and costs of $28.9 million.

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Maximum [Member]

Home Equity Lines [Member]

Home Equity Lines [Member]

Consumer Mortgages [Member]

Consumer Mortgages [Member]

Credit Cards [Member]

Credit Cards [Member]

Other Retail Loans [Member]

Other Retail Loans [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Investment Properties [Member]

Investment Properties [Member]

1-4 Family Properties [Member]

1-4 Family Properties [Member]

Land Acquisition [Member]

Land Acquisition [Member]

Commercial, Financial and Agricultural [Member]

Commercial, Financial and Agricultural [Member]

Owner-Occupied [Member]

Owner-Occupied [Member]

Retail [Member]

Retail [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Pass [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Special Mention [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Substandard [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Doubtful [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Loss [Member]

Home Equity Lines [Member]

Home Equity Lines [Member]

Consumer Mortgages [Member]

Consumer Mortgages [Member]

Credit Cards [Member]

Credit Cards [Member]

Other Retail Loans [Member]

Other Retail Loans [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Investment Properties [Member]

Investment Properties [Member]

1-4 Family Properties [Member]

1-4 Family Properties [Member]

Land Acquisition [Member]

Land Acquisition [Member]

Commercial, Financial and Agricultural [Member]

Commercial, Financial and Agricultural [Member]

Owner-Occupied [Member]

Owner-Occupied [Member]

Retail [Member]

Retail [Member]

Home Equity Lines [Member]

Home Equity Lines [Member]

Consumer Mortgages [Member]

Consumer Mortgages [Member]

Credit Cards [Member]

Credit Cards [Member]

Other Retail Loans [Member]

Other Retail Loans [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Investment Properties [Member]

Investment Properties [Member]

1-4 Family Properties [Member]

1-4 Family Properties [Member]

Land Acquisition [Member]

Land Acquisition [Member]

Commercial, Financial and Agricultural [Member]

Commercial, Financial and Agricultural [Member]

Owner-Occupied [Member]

Owner-Occupied [Member]

Retail [Member]

Retail [Member]

Home Equity Lines [Member]

Home Equity Lines [Member]

Consumer Mortgages [Member]

Consumer Mortgages [Member]

Credit Cards [Member]

Credit Cards [Member]

Other Retail Loans [Member]

Other Retail Loans [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Investment Properties [Member]

Investment Properties [Member]

1-4 Family Properties [Member]

1-4 Family Properties [Member]

Land Acquisition [Member]

Land Acquisition [Member]

Commercial, Financial and Agricultural [Member]

Commercial, Financial and Agricultural [Member]

Owner-Occupied [Member]

Owner-Occupied [Member]

Retail [Member]

Retail [Member]

Home Equity Lines [Member]

Home Equity Lines [Member]

Consumer Mortgages [Member]

Consumer Mortgages [Member]

Credit Cards [Member]

Credit Cards [Member]

Other Retail Loans [Member]

Other Retail Loans [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Investment Properties [Member]

Investment Properties [Member]

1-4 Family Properties [Member]

1-4 Family Properties [Member]

Land Acquisition [Member]

Land Acquisition [Member]

Commercial, Financial and Agricultural [Member]

Commercial, Financial and Agricultural [Member]

Owner-Occupied [Member]

Owner-Occupied [Member]

Retail [Member]

Retail [Member]

Home Equity Lines [Member]

Home Equity Lines [Member]

Consumer Mortgages [Member]

Consumer Mortgages [Member]

Credit Cards [Member]

Credit Cards [Member]

Other Retail Loans [Member]

Other Retail Loans [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Investment Properties [Member]

Investment Properties [Member]

1-4 Family Properties [Member]

1-4 Family Properties [Member]

Land Acquisition [Member]

Land Acquisition [Member]

Commercial, Financial and Agricultural [Member]

Commercial, Financial and Agricultural [Member]

Owner-Occupied [Member]

Owner-Occupied [Member]

Retail [Member]

Retail [Member]

Financing Receivable, Recorded Investment [Line Items]

'

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'

'

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'

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'

'

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'

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'

'

'

'

'

'

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'

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'

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'

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'

'

'

'

'

'

'

'

'

'

Total loans

$20,617,415,000

[1]

$20,086,660,000

[2]

$19,736,612,000

'

$1,685,972,000

$1,587,541,000

$1,621,904,000

$1,519,068,000

$253,853,000

$256,846,000

$293,232,000

$284,778,000

$10,017,075,000

$9,931,451,000

$6,745,379,000

$6,506,976,000

$5,019,046,000

$4,616,485,000

$1,137,554,000

$1,185,060,000

$588,779,000

$705,431,000

$6,003,409,000

$5,895,265,000

$4,013,666,000

$4,036,186,000

$3,854,961,000

$3,648,233,000

$19,250,559,000

$18,277,301,000

$1,661,751,000

$1,559,272,000

$1,577,632,000

$1,475,928,000

$252,510,000

$255,339,000

$289,713,000

$281,179,000

$9,395,463,000

$9,165,769,000

$6,073,490,000

$5,539,814,000

$4,687,315,000

$4,197,368,000

$925,346,000

$920,392,000

$460,829,000

$422,054,000

$5,667,272,000

$5,451,369,000

$3,728,191,000

$3,714,400,000

$3,781,606,000

$3,571,718,000

$652,155,000

$850,638,000

$0

$0

$0

$0

$0

$0

$0

$0

$299,261,000

$379,717,000

$352,894,000

$470,921,000

$197,501,000

$249,890,000

$99,686,000

$126,715,000

$55,707,000

$94,316,000

$174,559,000

$224,620,000

$124,702,000

$155,097,000

$0

$0

$687,417,000

[3]

$926,084,000

[3]

$19,239,000

[3]

$25,177,000

[3]

$42,323,000

[3]

$40,368,000

[3]

$539,000

[3]

$541,000

[3]

$3,383,000

[3]

$3,400,000

[3]

$311,373,000

[3]

$372,982,000

[3]

$310,560,000

[3]

$483,616,000

[3]

$134,230,000

[3]

$167,503,000

[3]

$104,994,000

[3]

$129,599,000

[3]

$71,336,000

[3]

$186,514,000

[3]

$151,871,000

[3]

$208,422,000

[3]

$159,502,000

[3]

$164,560,000

[3]

$65,484,000

[3]

$69,486,000

[3]

$21,568,000

[4]

$29,100,000

[4]

$2,090,000

[4]

$1,314,000

[4]

$1,610,000

[4]

$2,485,000

[4]

$0

[4]

$0

[4]

$32,000

[4]

$75,000

[4]

$9,401,000

[4]

$12,893,000

[4]

$8,435,000

[4]

$12,333,000

[4]

$0

[4]

$1,724,000

[4]

$7,528,000

[4]

$8,062,000

[4]

$907,000

[4]

$2,547,000

[4]

$8,562,000

[4]

$10,764,000

[4]

$839,000

[4]

$2,129,000

[4]

$3,732,000

[4]

$3,874,000

[4]

$5,716,000

$3,537,000

$2,892,000

[5]

$1,778,000

[5]

$339,000

[5]

$287,000

[5]

$804,000

[6]

$966,000

[6]

$104,000

[5]

$124,000

[5]

$1,577,000

[4],[5]

$90,000

$0

$292,000

$0

$0

$0

$292,000

[5]

$0

$0

$1,145,000

[5]

$90,000

[5]

$432,000

[5]

$0

$4,139,000

$3,155,000

Nonaccrual substandard loans

215,100,000

383,700,000

'

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'

Allowance for loan losses, percent of loan amount

'

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50.00%

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Deferred fees and costs, net

$28,800,000

$28,900,000

$25,000,000

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[1]

Total before net deferred fees and costs of $28.8 million.

[2]

Total before net deferred fees and costs of $28.9 million.

[3]

Includes $215.1 million and $383.7 million of non-accrual Substandard loans at September 30, 2014 and December 31, 2013, respectively.

[4]

The loans within this risk grade are on non-accrual status. Commercial loans generally have an allowance for loan losses in accordance with ASC 310, and retail loans generally have an allowance for loan losses equal to 50% of the loan amount.

[5]

The loans within this risk grade are on non-accrual status and have an allowance for loan losses equal to the full loan amount.

[6]

Represent amounts that were 120 days past due. These credits are downgraded to the Loss category with an allowance for loan losses equal to the full loan amount and are generally charged off upon reaching 181 days past due in accordance with the FFIEC Uniform Retail Credit Classification and Account Management Policy.

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses (Schedule Of Allowances For Loan Losses And Recorded Investment In Loans) (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Beginning balance, allowance	$277,783,000		$334,880,000	$307,560,000		$373,405,000	'
Allowance for loan losses of sold branches	'		'	-1,019,000		'	'
Charge-offs	-22,761,000		-30,253,000	-87,117,000		-145,288,000	'
Recoveries	10,511,000		7,224,000	24,314,000		34,961,000	'
Provision for loan losses	3,843,000		6,761,000	25,638,000		55,534,000	'
Ending balance, allowance	269,376,000		318,612,000	269,376,000		318,612,000	'
Ending balance: individually evaluated for impairment, allowance	39,165,000		78,051,000	39,165,000		78,051,000	'
Ending balance: collectively evaluated for impairment, allowance	230,211,000		240,561,000	230,211,000		240,561,000	'
Total loans	20,617,415,000	[1]	19,736,612,000	20,617,415,000	[1]	19,736,612,000	20,086,660,000	[2]
Ending balance: individually evaluated for impairment, loans	537,540,000		881,953,000	537,540,000		881,953,000	'
Ending balance: collectively evaluated for impairment, loans	20,079,875,000		18,854,659,000	20,079,875,000		18,854,659,000	'
Deferred fees and costs, net	28,800,000		25,000,000	28,800,000		25,000,000	28,900,000
Commercial Real Estate [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Beginning balance, allowance	104,394,000		138,329,000	127,646,000		167,926,000	'
Allowance for loan losses of sold branches	'		'	-281,000		'	'
Charge-offs	-5,233,000		-9,474,000	-41,139,000		-73,825,000	'
Recoveries	3,099,000		2,766,000	8,318,000		11,861,000	'
Provision for loan losses	-271,000		5,562,000	7,445,000		31,221,000	'
Ending balance, allowance	101,989,000		137,183,000	101,989,000		137,183,000	'
Ending balance: individually evaluated for impairment, allowance	22,107,000		50,737,000	22,107,000		50,737,000	'
Ending balance: collectively evaluated for impairment, allowance	79,882,000		86,446,000	79,882,000		86,446,000	'
Total loans	6,745,379,000	[1]	6,458,518,000	6,745,379,000	[1]	6,458,518,000	'
Ending balance: individually evaluated for impairment, loans	317,011,000		569,128,000	317,011,000		569,128,000	'
Ending balance: collectively evaluated for impairment, loans	6,428,368,000		5,889,390,000	6,428,368,000		5,889,390,000	'
Commercial and Industrial [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Beginning balance, allowance	130,814,000		133,190,000	115,435,000		138,495,000	'
Allowance for loan losses of sold branches	'		'	-398,000		'	'
Charge-offs	-11,306,000		-13,871,000	-26,896,000		-44,104,000	'
Recoveries	5,257,000		2,152,000	9,562,000		17,266,000	'
Provision for loan losses	78,000		-2,352,000	27,140,000		7,462,000	'
Ending balance, allowance	124,843,000		119,119,000	124,843,000		119,119,000	'
Ending balance: individually evaluated for impairment, allowance	15,863,000		25,194,000	15,863,000		25,194,000	'
Ending balance: collectively evaluated for impairment, allowance	108,980,000		93,925,000	108,980,000		93,925,000	'
Total loans	10,017,075,000	[1]	9,705,425,000	10,017,075,000	[1]	9,705,425,000	'
Ending balance: individually evaluated for impairment, loans	172,860,000		259,764,000	172,860,000		259,764,000	'
Ending balance: collectively evaluated for impairment, loans	9,844,215,000		9,445,661,000	9,844,215,000		9,445,661,000	'
Retail [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Beginning balance, allowance	42,575,000		40,361,000	41,479,000		38,984,000	'
Allowance for loan losses of sold branches	'		'	-340,000		'	'
Charge-offs	-6,222,000		-6,908,000	-19,082,000		-27,359,000	'
Recoveries	2,155,000		2,306,000	6,434,000		5,834,000	'
Provision for loan losses	4,036,000		3,551,000	14,053,000		21,851,000	'
Ending balance, allowance	42,544,000		39,310,000	42,544,000		39,310,000	'
Ending balance: individually evaluated for impairment, allowance	1,195,000		2,120,000	1,195,000		2,120,000	'
Ending balance: collectively evaluated for impairment, allowance	41,349,000		37,190,000	41,349,000		37,190,000	'
Total loans	3,854,961,000	[1]	3,572,669,000	3,854,961,000	[1]	3,572,669,000	'
Ending balance: individually evaluated for impairment, loans	47,669,000		53,061,000	47,669,000		53,061,000	'
Ending balance: collectively evaluated for impairment, loans	3,807,292,000		3,519,608,000	3,807,292,000		3,519,608,000	'
Unallocated [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Beginning balance, allowance	0		23,000,000	23,000,000		28,000,000	'
Allowance for loan losses of sold branches	'		'	0		'	'
Charge-offs	0		0	0		0	'
Recoveries	0		0	0		0	'
Provision for loan losses	0		0	-23,000,000		-5,000,000	'
Ending balance, allowance	0		23,000,000	0		23,000,000	'
Ending balance: individually evaluated for impairment, allowance	0		0	0		0	'
Ending balance: collectively evaluated for impairment, allowance	0		23,000,000	0		23,000,000	'
Total loans	0	[1]	0	0	[1]	0	'
Ending balance: individually evaluated for impairment, loans	0		0	0		0	'
Ending balance: collectively evaluated for impairment, loans	$0		$0	$0		$0	'
[1]	Total before net deferred fees and costs of $28.8 million.
[2]	Total before net deferred fees and costs of $28.9 million.

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses (Schedule Of Impaired Loans) (Details) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	$89,736,000	$89,736,000	'	$94,001,000
Recorded Investment, With allowance recorded	447,804,000	447,804,000	'	742,553,000
Recorded Investment	537,540,000	537,540,000	'	836,554,000
Unpaid Principal Balance, With no related allowance recorded	166,101,000	166,101,000	'	181,809,000
Unpaid Principal Balance, With allowance recorded	455,349,000	455,349,000	'	782,252,000
Unpaid Principal Balance	621,450,000	621,450,000	'	964,061,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	39,165,000	39,165,000	'	67,997,000
Related Allowance	39,165,000	39,165,000	'	67,997,000
Average Recorded Investment, With no related allowance recorded	93,498,000	94,532,000	'	122,283,000
Average Recorded Investment, With allowance recorded	466,178,000	572,308,000	'	830,035,000
Average Recorded Investment	559,676,000	666,840,000	'	952,318,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	3,731,000	11,711,000	'	21,114,000
Interest Income Recognized	3,731,000	11,711,000	0	21,114,000
Home Equity Lines [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	0	0	'	0
Recorded Investment, With allowance recorded	3,822,000	3,822,000	'	2,750,000
Recorded Investment	3,822,000	3,822,000	'	2,750,000
Unpaid Principal Balance, With no related allowance recorded	0	0	'	0
Unpaid Principal Balance, With allowance recorded	3,822,000	3,822,000	'	2,750,000
Unpaid Principal Balance	3,822,000	3,822,000	'	2,750,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	68,000	68,000	'	116,000
Related Allowance	68,000	68,000	'	116,000
Average Recorded Investment, With no related allowance recorded	0	0	'	33,000
Average Recorded Investment, With allowance recorded	3,809,000	3,253,000	'	4,668,000
Average Recorded Investment	3,809,000	3,253,000	'	4,701,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	40,000	71,000	'	176,000
Interest Income Recognized	40,000	71,000	'	176,000
Consumer Mortgages [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	995,000	995,000	'	1,180,000
Recorded Investment, With allowance recorded	37,591,000	37,591,000	'	44,019,000
Recorded Investment	38,586,000	38,586,000	'	45,199,000
Unpaid Principal Balance, With no related allowance recorded	2,065,000	2,065,000	'	2,840,000
Unpaid Principal Balance, With allowance recorded	37,591,000	37,591,000	'	44,019,000
Unpaid Principal Balance	39,656,000	39,656,000	'	46,859,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	1,029,000	1,029,000	'	967,000
Related Allowance	1,029,000	1,029,000	'	967,000
Average Recorded Investment, With no related allowance recorded	1,869,000	1,471,000	'	1,487,000
Average Recorded Investment, With allowance recorded	39,217,000	40,582,000	'	48,674,000
Average Recorded Investment	41,086,000	42,053,000	'	50,161,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	457,000	999,000	'	1,910,000
Interest Income Recognized	457,000	999,000	'	1,910,000
Credit Card Receivable [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	0	0	'	0
Recorded Investment, With allowance recorded	0	0	'	0
Recorded Investment	0	0	'	0
Unpaid Principal Balance, With no related allowance recorded	0	0	'	0
Unpaid Principal Balance, With allowance recorded	0	0	'	0
Unpaid Principal Balance	0	0	'	0
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	0	0	'	0
Related Allowance	0	0	'	0
Average Recorded Investment, With no related allowance recorded	0	0	'	0
Average Recorded Investment, With allowance recorded	0	0	'	0
Average Recorded Investment	0	0	'	0
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	0	0	'	0
Interest Income Recognized	0	0	'	0
Other Retail Loans [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	0	0	'	0
Recorded Investment, With allowance recorded	5,261,000	5,261,000	'	7,013,000
Recorded Investment	5,261,000	5,261,000	'	7,013,000
Unpaid Principal Balance, With no related allowance recorded	0	0	'	0
Unpaid Principal Balance, With allowance recorded	5,261,000	5,261,000	'	7,013,000
Unpaid Principal Balance	5,261,000	5,261,000	'	7,013,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	98,000	98,000	'	109,000
Related Allowance	98,000	98,000	'	109,000
Average Recorded Investment, With no related allowance recorded	0	0	'	4,000
Average Recorded Investment, With allowance recorded	5,171,000	4,892,000	'	5,555,000
Average Recorded Investment	5,171,000	4,892,000	'	5,559,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	88,000	228,000	'	285,000
Interest Income Recognized	88,000	228,000	'	285,000
Investment Properties [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	33,849,000	33,849,000	'	14,218,000
Recorded Investment, With allowance recorded	117,707,000	117,707,000	'	186,058,000
Recorded Investment	151,556,000	151,556,000	'	200,276,000
Unpaid Principal Balance, With no related allowance recorded	46,096,000	46,096,000	'	15,820,000
Unpaid Principal Balance, With allowance recorded	119,560,000	119,560,000	'	193,765,000
Unpaid Principal Balance	165,656,000	165,656,000	'	209,585,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	6,621,000	6,621,000	'	8,863,000
Related Allowance	6,621,000	6,621,000	'	8,863,000
Average Recorded Investment, With no related allowance recorded	33,167,000	24,949,000	'	18,046,000
Average Recorded Investment, With allowance recorded	118,729,000	141,128,000	'	227,073,000
Average Recorded Investment	151,896,000	166,077,000	'	245,119,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	961,000	3,034,000	'	5,062,000
Interest Income Recognized	961,000	3,034,000	'	5,062,000
1-4 Family Properties [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	4,386,000	4,386,000	'	9,679,000
Recorded Investment, With allowance recorded	83,797,000	83,797,000	'	115,151,000
Recorded Investment	88,183,000	88,183,000	'	124,830,000
Unpaid Principal Balance, With no related allowance recorded	12,251,000	12,251,000	'	29,741,000
Unpaid Principal Balance, With allowance recorded	84,588,000	84,588,000	'	117,498,000
Unpaid Principal Balance	96,839,000	96,839,000	'	147,239,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	10,694,000	10,694,000	'	11,135,000
Related Allowance	10,694,000	10,694,000	'	11,135,000
Average Recorded Investment, With no related allowance recorded	4,151,000	5,984,000	'	23,879,000
Average Recorded Investment, With allowance recorded	87,829,000	99,038,000	'	115,629,000
Average Recorded Investment	91,980,000	105,022,000	'	139,508,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	613,000	2,209,000	'	3,464,000
Interest Income Recognized	613,000	2,209,000	'	3,464,000
Land Acquisition [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	29,501,000	29,501,000	'	30,595,000
Recorded Investment, With allowance recorded	47,771,000	47,771,000	'	183,029,000
Recorded Investment	77,272,000	77,272,000	'	213,624,000
Unpaid Principal Balance, With no related allowance recorded	76,068,000	76,068,000	'	78,470,000
Unpaid Principal Balance, With allowance recorded	47,914,000	47,914,000	'	202,048,000
Unpaid Principal Balance	123,982,000	123,982,000	'	280,518,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	4,792,000	4,792,000	'	26,789,000
Related Allowance	4,792,000	4,792,000	'	26,789,000
Average Recorded Investment, With no related allowance recorded	29,584,000	31,187,000	'	41,007,000
Average Recorded Investment, With allowance recorded	48,499,000	102,880,000	'	191,807,000
Average Recorded Investment	78,083,000	134,067,000	'	232,814,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	418,000	1,264,000	'	2,931,000
Interest Income Recognized	418,000	1,264,000	'	2,931,000
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	67,736,000	67,736,000	'	54,492,000
Recorded Investment, With allowance recorded	249,275,000	249,275,000	'	484,238,000
Recorded Investment	317,011,000	317,011,000	'	538,730,000
Unpaid Principal Balance, With no related allowance recorded	134,415,000	134,415,000	'	124,031,000
Unpaid Principal Balance, With allowance recorded	252,062,000	252,062,000	'	513,311,000
Unpaid Principal Balance	386,477,000	386,477,000	'	637,342,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	22,107,000	22,107,000	'	46,787,000
Related Allowance	22,107,000	22,107,000	'	46,787,000
Average Recorded Investment, With no related allowance recorded	66,902,000	62,120,000	'	82,932,000
Average Recorded Investment, With allowance recorded	255,057,000	343,046,000	'	534,509,000
Average Recorded Investment	321,959,000	405,166,000	'	617,441,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	1,992,000	6,507,000	'	11,457,000
Interest Income Recognized	1,992,000	6,507,000	'	11,457,000
Commercial, Financial and Agricultural [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	5,705,000	5,705,000	'	13,490,000
Recorded Investment, With allowance recorded	81,036,000	81,036,000	'	115,532,000
Recorded Investment	86,741,000	86,741,000	'	129,022,000
Unpaid Principal Balance, With no related allowance recorded	12,109,000	12,109,000	'	22,312,000
Unpaid Principal Balance, With allowance recorded	85,771,000	85,771,000	'	120,290,000
Unpaid Principal Balance	97,880,000	97,880,000	'	142,602,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	12,532,000	12,532,000	'	15,559,000
Related Allowance	12,532,000	12,532,000	'	15,559,000
Average Recorded Investment, With no related allowance recorded	6,785,000	9,917,000	'	15,355,000
Average Recorded Investment, With allowance recorded	82,271,000	97,143,000	'	128,680,000
Average Recorded Investment	89,056,000	107,060,000	'	144,035,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	553,000	1,877,000	'	3,630,000
Interest Income Recognized	553,000	1,877,000	'	3,630,000
Owner-Occupied [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	15,300,000	15,300,000	'	24,839,000
Recorded Investment, With allowance recorded	70,819,000	70,819,000	'	89,001,000
Recorded Investment	86,119,000	86,119,000	'	113,840,000
Unpaid Principal Balance, With no related allowance recorded	17,512,000	17,512,000	'	32,626,000
Unpaid Principal Balance, With allowance recorded	70,842,000	70,842,000	'	94,869,000
Unpaid Principal Balance	88,354,000	88,354,000	'	127,495,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	3,331,000	3,331,000	'	4,459,000
Related Allowance	3,331,000	3,331,000	'	4,459,000
Average Recorded Investment, With no related allowance recorded	17,942,000	21,024,000	'	22,472,000
Average Recorded Investment, With allowance recorded	80,653,000	83,392,000	'	107,949,000
Average Recorded Investment	98,595,000	104,416,000	'	130,421,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	601,000	2,029,000	'	3,656,000
Interest Income Recognized	601,000	2,029,000	'	3,656,000
Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	21,005,000	21,005,000	'	38,329,000
Recorded Investment, With allowance recorded	151,855,000	151,855,000	'	204,533,000
Recorded Investment	172,860,000	172,860,000	'	242,862,000
Unpaid Principal Balance, With no related allowance recorded	29,621,000	29,621,000	'	54,938,000
Unpaid Principal Balance, With allowance recorded	156,613,000	156,613,000	'	215,159,000
Unpaid Principal Balance	186,234,000	186,234,000	'	270,097,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	15,863,000	15,863,000	'	20,018,000
Related Allowance	15,863,000	15,863,000	'	20,018,000
Average Recorded Investment, With no related allowance recorded	24,727,000	30,941,000	'	37,827,000
Average Recorded Investment, With allowance recorded	162,924,000	180,535,000	'	236,629,000
Average Recorded Investment	187,651,000	211,476,000	'	274,456,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	1,154,000	3,906,000	'	7,286,000
Interest Income Recognized	1,154,000	3,906,000	'	7,286,000
Retail [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Recorded Investment, With no related allowance recorded	995,000	995,000	'	1,180,000
Recorded Investment, With allowance recorded	46,674,000	46,674,000	'	53,782,000
Recorded Investment	47,669,000	47,669,000	'	54,962,000
Unpaid Principal Balance, With no related allowance recorded	2,065,000	2,065,000	'	2,840,000
Unpaid Principal Balance, With allowance recorded	46,674,000	46,674,000	'	53,782,000
Unpaid Principal Balance	48,739,000	48,739,000	'	56,622,000
Related Allowance, With no related allowance recorded	0	0	'	0
Related Allowance, With allowance recorded	1,195,000	1,195,000	'	1,192,000
Related Allowance	1,195,000	1,195,000	'	1,192,000
Average Recorded Investment, With no related allowance recorded	1,869,000	1,471,000	'	1,524,000
Average Recorded Investment, With allowance recorded	48,197,000	48,727,000	'	58,897,000
Average Recorded Investment	50,066,000	50,198,000	'	60,421,000
Interest Income Recognized, With no related allowance recorded	0	0	'	0
Interest Income Recognized, With allowance recorded	585,000	1,298,000	'	2,371,000
Interest Income Recognized	$585,000	$1,298,000	'	$2,371,000

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
	Contract		Contract		Contract		Contract
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	61		149		188		485
Recorded Investment	$21,757	[1]	$216,194	[2]	$96,417	[3]	$382,596	[4]
Net charge-offs	163		146		163		199
Home Equity Lines [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	5		0		11		1
Recorded Investment	435		0		1,614		80
Consumer Mortgages [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	5		39		13		123
Recorded Investment	755		4,072		2,611		14,234
Credit Cards [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0		0		0		0
Recorded Investment	0		0		0		0
Other Retail Loans [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	7		18		17		56
Recorded Investment	251		815		928		2,303
Investment Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	4		13		14		44
Recorded Investment	4,774		74,111		14,021		125,635
1-4 Family Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	7		41		36		99
Recorded Investment	1,082		6,965		6,249		37,916
Land Acquisition [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	3		10		15		26
Recorded Investment	3,188		110,827		9,747		123,464
Commercial Real Estate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	14		64		65		169
Recorded Investment	9,044		191,903		30,017		287,015
Commercial, Financial and Agricultural [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	28		16		68		85
Recorded Investment	8,438		5,889		24,676		34,458
Owner-Occupied [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	2		12		14		51
Recorded Investment	2,833		13,515		36,570		44,506
Commercial and Industrial [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	30		28		82		136
Recorded Investment	11,272		19,404		61,247		78,964
Retail [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	17		57		41		180
Recorded Investment	1,441		4,887		5,153		16,617
Principal Forgiveness [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	2,398		'		2,398		681
Principal Forgiveness [Member] | Home Equity Lines [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Principal Forgiveness [Member] | Consumer Mortgages [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Principal Forgiveness [Member] | Credit Cards [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Principal Forgiveness [Member] | Other Retail Loans [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Principal Forgiveness [Member] | Investment Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Principal Forgiveness [Member] | 1-4 Family Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		424
Principal Forgiveness [Member] | Land Acquisition [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	2,338		0		2,338		74
Principal Forgiveness [Member] | Commercial Real Estate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	2,338		0		2,338		498
Principal Forgiveness [Member] | Commercial, Financial and Agricultural [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	60		0		60		183
Principal Forgiveness [Member] | Owner-Occupied [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Principal Forgiveness [Member] | Commercial and Industrial [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	60		0		60		183
Principal Forgiveness [Member] | Retail [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Below Market Interest Rate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	8,839		199,490		49,354		318,033
Below Market Interest Rate [Member] | Home Equity Lines [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	435		0		1,163		0
Below Market Interest Rate [Member] | Consumer Mortgages [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	543		3,106		2,296		10,230
Below Market Interest Rate [Member] | Credit Cards [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		0		0
Below Market Interest Rate [Member] | Other Retail Loans [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	101		419		543		879
Below Market Interest Rate [Member] | Investment Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	875		74,111		8,423		121,263
Below Market Interest Rate [Member] | 1-4 Family Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	879		4,832		2,390		28,863
Below Market Interest Rate [Member] | Land Acquisition [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	204		108,295		4,721		113,627
Below Market Interest Rate [Member] | Commercial Real Estate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	1,958		187,238		15,534		263,753
Below Market Interest Rate [Member] | Commercial, Financial and Agricultural [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	3,098		3,152		7,639		21,600
Below Market Interest Rate [Member] | Owner-Occupied [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	2,703		5,575		22,178		21,571
Below Market Interest Rate [Member] | Commercial and Industrial [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	5,802		8,727		29,818		43,171
Below Market Interest Rate [Member] | Retail [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	1,079		3,525		4,002		11,109
Term Extensions and or Other Concessions [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	10,520		16,704		44,665		63,882
Term Extensions and or Other Concessions [Member] | Home Equity Lines [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	0		0		451		80
Term Extensions and or Other Concessions [Member] | Consumer Mortgages [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	212		966		315		4,004
Term Extensions and or Other Concessions [Member] | Credit Cards [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	'		0		0		0
Term Extensions and or Other Concessions [Member] | Other Retail Loans [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	150		396		385		1,424
Term Extensions and or Other Concessions [Member] | Investment Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	3,899		0		5,598		4,372
Term Extensions and or Other Concessions [Member] | 1-4 Family Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	203		2,133		3,859		8,629
Term Extensions and or Other Concessions [Member] | Land Acquisition [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	646		2,532		2,688		9,763
Term Extensions and or Other Concessions [Member] | Commercial Real Estate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	4,748		4,665		12,145		22,764
Term Extensions and or Other Concessions [Member] | Commercial, Financial and Agricultural [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	5,280		2,737		16,977		12,675
Term Extensions and or Other Concessions [Member] | Owner-Occupied [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	130		7,940		14,392		22,935
Term Extensions and or Other Concessions [Member] | Commercial and Industrial [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	5,410		10,677		31,369		35,610
Term Extensions and or Other Concessions [Member] | Retail [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Recorded Investment	$362		$1,362		$1,151		$5,508
[1]	Net charge-offs of $163 thousand were recorded during the three months ended September 30, 2014 upon restructuring of these loans.
[2]	Net charge-offs of $146 thousand were recorded during the three months ended September 30, 2013 upon restructuring of these loans.
[3]	Net charge-offs of $163 thousand were recorded during the nine months ended September 30, 2014 upon restructuring of these loans.
[4]	Net charge-offs of $199 thousand were recorded during the nine months ended September 30, 2013 upon restructuring of these loans.

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses (Troubled Debt Restructurings That Subsequently Defaulted) (Details) (Troubled Debt Restructurings That Subsequently Defaulted [Member], USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
	Contract		Contract		Contract		Contract
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	4	[1]	4	[1]	12	[1]	34	[1]
Recorded Investment	$317	[1]	$1,935	[1]	$3,397	[1]	$19,840	[1]
Home Equity Lines [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	1	[1]	0	[1]	1	[1]
Recorded Investment	0	[1]	98	[1]	0	[1]	98	[1]
Consumer Mortgages [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	2	[1]	2	[1]	3	[1]	15	[1]
Recorded Investment	136	[1]	217	[1]	206	[1]	1,195	[1]
Credit Cards [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	0	[1]	0	[1]	0	[1]
Recorded Investment	0	[1]	0	[1]	0	[1]	0	[1]
Other Retail Loans [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	0	[1]	0	[1]	1	[1]
Recorded Investment	0	[1]	0	[1]	0	[1]	195	[1]
Investment Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	0	[1]	1	[1]	2	[1]
Recorded Investment	0	[1]	0	[1]	186	[1]	4,519	[1]
1-4 Family Properties [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	1	[1]	3	[1]	9	[1]
Recorded Investment	0	[1]	1,620	[1]	1,018	[1]	12,374	[1]
Land Acquisition [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	0	[1]	1	[1]	1	[1]
Recorded Investment	0	[1]	0	[1]	428	[1]	126	[1]
Commercial Real Estate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	1	[1]	5	[1]	12	[1]
Recorded Investment	0	[1]	1,620	[1]	1,632	[1]	17,019	[1]
Commercial, Financial and Agricultural [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	2	[1]	0	[1]	4	[1]	3	[1]
Recorded Investment	181	[1]	0	[1]	1,559	[1]	409	[1]
Owner-Occupied [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	0	[1]	0	[1]	0	[1]	2	[1]
Recorded Investment	0	[1]	0	[1]	0	[1]	924	[1]
Commercial and Industrial [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	2	[1]	0	[1]	4	[1]	5	[1]
Recorded Investment	181	[1]	0	[1]	1,559	[1]	1,333	[1]
Retail [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	2	[1]	3	[1]	3	[1]	17	[1]
Recorded Investment	$136	[1]	$315	[1]	$206	[1]	$1,488	[1]
[1]	Default is defined as the earlier of the troubled debt restructuring being placed on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments.

Other_Real_Estate_Details

Other Real Estate (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'	'	'	'	'
Other real estate	$81,636,000	'	$81,636,000	'	$112,629,000
Loans foreclosed and transferred to other real estate	'	'	35,500,000	76,200,000	'
Foreclosed real estate expense, net	9,074,000	10,359,000	18,818,000	28,800,000	'
Write-downs to net realizable value and losses resulting from sales transactions	'	'	$16,734,000	$22,714,000	'

Other_Comprehensive_Income_Los2

Other Comprehensive Income (Loss) (Narrative) (Details) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Class of Stock [Line Items]	'	'	'	'	'	'
Accumulated other comprehensive income (loss)	($24,827)	($13,716)	($41,258)	($29,514)	($33,060)	$4,101
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]	'	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'	'
Accumulated other comprehensive income (loss)	-12,893	-12,962	-13,099	-13,168	-13,237	-13,373
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member] | Valuation Allowance of Deferred Tax Assets [Member]	'	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'	'
Accumulated other comprehensive income (loss)	-12,100	'	'	'	'	'
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]	'	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'	'
Accumulated other comprehensive income (loss)	-12,866	-1,686	-28,936	-17,168	-20,689	17,111
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member] | Valuation Allowance of Deferred Tax Assets [Member]	'	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'	'
Accumulated other comprehensive income (loss)	($13,300)	'	'	'	'	'

Other_Comprehensive_Income_Los3

Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]	'	'	'	'
Beginning balance	($13,716)	($33,060)	($41,258)	$4,101
Other comprehensive income (loss) before reclassifications	-11,180	4,212	17,131	-32,179
Amounts reclassified from accumulated other comprehensive income (loss)	69	-666	-700	-1,436
Net current period other comprehensive income (loss)	-11,111	3,546	16,431	-33,615
Ending balance	-24,827	-29,514	-24,827	-29,514
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]	'	'	'	'
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]	'	'	'	'
Beginning balance	-12,962	-13,237	-13,099	-13,373
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	69	69	206	205
Net current period other comprehensive income (loss)	69	69	206	205
Ending balance	-12,893	-13,168	-12,893	-13,168
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]	'	'	'	'
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]	'	'	'	'
Beginning balance	-1,686	-20,689	-28,936	17,111
Other comprehensive income (loss) before reclassifications	-11,180	4,212	16,888	-32,698
Amounts reclassified from accumulated other comprehensive income (loss)	0	-691	-818	-1,581
Net current period other comprehensive income (loss)	-11,180	3,521	16,070	-34,279
Ending balance	-12,866	-17,168	-12,866	-17,168
Post-Retirement Unfunded Health Benefit [Member]	'	'	'	'
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]	'	'	'	'
Beginning balance	932	866	777	363
Other comprehensive income (loss) before reclassifications	0	0	243	519
Amounts reclassified from accumulated other comprehensive income (loss)	0	-44	-88	-60
Net current period other comprehensive income (loss)	0	-44	155	459
Ending balance	$932	$822	$932	$822

Other_Comprehensive_Income_Los4

Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Interest expense	($27,131)	($29,882)	($82,160)	($89,894)
Income tax (expense) benefit	-25,868	-27,765	-81,554	-72,114
Investment securities gains, net	0	1,124	1,331	2,571
Salaries and other personnel expense	-193,749	-187,328	-560,115	-550,799
Net income available to common shareholders	44,229	37,188	134,399	82,704
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]	'	'	'	'
Reclassification out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Interest expense	-112	-112	-336	-336
Income tax (expense) benefit	43	43	130	131
Net income available to common shareholders	-69	-69	-206	-205
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]	'	'	'	'
Reclassification out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Income tax (expense) benefit	'	-433	-513	-990
Investment securities gains, net	'	1,124	1,331	2,571
Net income available to common shareholders	'	691	818	1,581
Post-Retirement Unfunded Health Benefit [Member]	'	'	'	'
Reclassification out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Income tax (expense) benefit	'	-28	-56	-38
Salaries and other personnel expense	'	72	144	98
Net income available to common shareholders	'	$44	$88	$60

Fair_Value_Accounting_Financia

Fair Value Accounting (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	$12,705		$6,113
Investment securities available for sale	3,050,257		3,199,358
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	177,395		195,117
Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	373,459		398,540
State And Municipal Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	5,301		6,889
Other Investments [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	18,673		3,691
U.S. Treasury Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	42,668		17,791
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	2,316,608		2,421,360
Equity Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	6,357		7,584
Level 1 [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	97		0
Investment securities available for sale	51,031		26,716
Private equity investments	0		0
Derivative assets	0		0
Salary stock units	728		1,764
Level 2 [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	12,608		6,113
Investment securities available for sale	2,997,441		3,170,292
Private equity investments	1,094		1,615
Derivative assets	31,322		40,004
Salary stock units	0		0
Level 3 [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Investment securities available for sale	1,785		2,350
Private equity investments	27,232		27,745
Derivative assets	0		0
Salary stock units	0		0
Fair Value, Measurements, Recurring [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	12,705		6,113
Mortgage loans held for sale	72,333		45,384
Investment securities available for sale	3,050,257		3,199,358
Private equity investments	28,326		29,360
Mutual funds held in Rabbi Trusts	10,817		11,246
Derivative assets	31,322		40,004
Trading account liabilities	6,264		'
Salary stock units	728		1,764
Derivative liabilities	35,030		42,142
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	3,502		'
Investment securities available for sale	177,395		195,117
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	3,677		2,465
Investment securities available for sale	373,459		398,540
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		429
Investment securities available for sale	5,301		6,889
Fair Value, Measurements, Recurring [Member] | All Other Mortgage-Backed Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	4,174		968
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	1,352		2,251
Investment securities available for sale	18,673	[1]	3,691	[1]
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	42,668		17,791
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	27,469		34,641
Fair Value, Measurements, Recurring [Member] | Securities Issued By U S Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	82,327		113,745
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	2,316,608		2,421,360
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	6,357		7,584
Fair Value, Measurements, Recurring [Member] | Mortgages [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading account liabilities	'		1,763
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	30,184		38,482
Derivative liabilities	30,689		39,436
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	1,138		1,522
Derivative liabilities	320	[2]	'
Fair Value, Measurements, Recurring [Member] | Other Derivative Contracts, Net [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative liabilities	4,021		2,706
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	97		0
Mortgage loans held for sale	0		0
Investment securities available for sale	51,031		26,716
Private equity investments	0		0
Mutual funds held in Rabbi Trusts	10,817		11,246
Derivative assets	0		0
Trading account liabilities	0		'
Salary stock units	728		1,764
Derivative liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | State And Municipal Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | All Other Mortgage-Backed Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other Investments [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	97		0
Investment securities available for sale	2,006	[1]	1,969	[1]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	42,668		17,791
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Government Agencies Debt Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Securities Issued By U S Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	6,357		6,956
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgages [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading account liabilities	'		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Contracts [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	0		0
Derivative liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage Derivatives [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	0		0
Derivative liabilities	0	[2]	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other Derivative Contracts, Net [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	12,608		6,113
Mortgage loans held for sale	72,333		45,384
Investment securities available for sale	2,997,441		3,170,292
Private equity investments	1,094		1,615
Mutual funds held in Rabbi Trusts	0		0
Derivative assets	31,322		40,004
Trading account liabilities	6,264		'
Salary stock units	0		0
Derivative liabilities	31,009		39,436
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	3,502		'
Investment securities available for sale	177,395		195,117
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	3,677		2,465
Investment securities available for sale	373,459		398,540
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | State And Municipal Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		429
Investment securities available for sale	5,301		6,889
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | All Other Mortgage-Backed Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	4,174		968
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Investments [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	1,255		2,251
Investment securities available for sale	14,882	[1]	0	[1]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Government Agencies Debt Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	27,469		34,641
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Securities Issued By U S Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	82,327		113,745
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	2,316,608		2,421,360
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgages [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading account liabilities	'		1,763
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Contracts [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	30,184		38,482
Derivative liabilities	30,689		39,436
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage Derivatives [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	1,138		1,522
Derivative liabilities	320	[2]	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Derivative Contracts, Net [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Mortgage loans held for sale	0		0
Investment securities available for sale	1,785		2,350
Private equity investments	27,232		27,745
Mutual funds held in Rabbi Trusts	0		0
Derivative assets	0		0
Trading account liabilities	0		'
Salary stock units	0		0
Derivative liabilities	4,021		2,706
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | State And Municipal Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | All Other Mortgage-Backed Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Investments [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading securities	0		0
Investment securities available for sale	1,785	[1]	1,722	[1]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Treasury Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | US Government Agencies Debt Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Securities Issued By U S Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Investment securities available for sale	0		628
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgages [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Trading account liabilities	'		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Contracts [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	0		0
Derivative liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Derivatives [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative assets	0		0
Derivative liabilities	0	[2]	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Derivative Contracts, Net [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Derivative liabilities	$4,021		$2,706
[1]	Based on an analysis of the nature and risks of these investments, Synovus has determined that presenting these investments as a single asset class is appropriate.
[2]	Mortgage derivatives consist of customer interest rate lock commitments that relate to the potential origination of mortgage loans, which would be classified as held for sale and forward loan sales commitments with third party investors.

Fair_Value_Accounting_Changes_

Fair Value Accounting (Changes In Fair Value Included In Consolidated Statements Of Income) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'	'	'	'	'
Mortgage loans held for sale	($813)	$4,092	$969	($3,838)	'
Aggregate fair value	72,333	'	72,333	'	45,384
Unpaid principal balance	70,924	'	70,924	'	44,943
Aggregate fair value less aggregate unpaid principal balance	$1,409	'	$1,409	'	$441

Fair_Value_Accounting_Changes_1

Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Investment Securities Available for Sale [Member]	'		'		'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'	'
Beginning balance	$1,866		$3,454		$2,350	$3,178
Included in earnings	0	[1]	0	[1]	-88	0
Unrealized gains (losses) included in other comprehensive income	-81		125		63	401
Purchases	0		0		0	0
Sales	0		0		0	0
Issuances	0		0		0	0
Settlements	0		0		-540	0
Amortization of discount/premium	0		0		0	0
Transfers in and/or out of Level 3	0		0		0	0
Ending balance	1,785		3,579		1,785	3,579
Total net gains (losses) for the nine months included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at September 30,	0		0		-88	0
Private Equity Investments [Member]	'		'		'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'	'
Beginning balance	27,376		29,568		27,745	30,708
Included in earnings	-144	[1]	284	[1]	-513	-856
Unrealized gains (losses) included in other comprehensive income	0		0		0	0
Purchases	0		0		'	0
Sales	0		0		0	0
Issuances	0		0		0	0
Settlements	0		0		0	0
Amortization of discount/premium	0		0		0	0
Transfers in and/or out of Level 3	0		0		0	0
Ending balance	27,232		29,852		27,232	29,852
Total net gains (losses) for the nine months included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at September 30,	-144		284		-513	-856
Other Derivative Contracts, Net [Member]	'		'		'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'	'
Beginning balance	-2,438		-2,977		-2,706	-2,956
Included in earnings	-1,979	[1]	0	[1]	-2,731	-801
Unrealized gains (losses) included in other comprehensive income	0		0		0	0
Purchases	0		0		0	0
Sales	0		0		0	0
Issuances	0		0		0	0
Settlements	396		472		1,416	1,252
Amortization of discount/premium	0		0		0	0
Transfers in and/or out of Level 3	0		0		0	0
Ending balance	-4,021		-2,505		-4,021	-2,505
Total net gains (losses) for the nine months included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at September 30,	($1,979)		$0		($2,731)	($801)
[1]	Included in earnings as a component of non-interest income (expense).

Fair_Value_Accounting_Assets_A

Fair Value Accounting (Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Collateral dependent impaired loans	$537,540		$836,554
Other loans held for sale	338		10,685
Other real estate	81,636		112,629
Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other loans held for sale	0		0
Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other loans held for sale	0		0
Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other loans held for sale	338		10,685
Fair Value, Measurements, Nonrecurring [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Collateral dependent impaired loans	37,790	[1]	170,693	[1]
Other loans held for sale	338		9,670
Other real estate	25,928		50,070
Other assets held for sale	7,744		4,945
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Collateral dependent impaired loans	0	[1]	0	[1]
Other loans held for sale	0		0
Other real estate	0		0
Other assets held for sale	0		0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Collateral dependent impaired loans	0	[1]	0	[1]
Other loans held for sale	0		0
Other real estate	0		0
Other assets held for sale	0		0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Collateral dependent impaired loans	37,790	[1]	170,693	[1]
Other loans held for sale	338		9,670
Other real estate	25,928		50,070
Other assets held for sale	$7,744		$4,945
[1]	Impaired loans that are collateral-dependent.

Fair_Value_Accounting_Assets_M

Fair Value Accounting (Assets Measured at Fair Value on Nonrecurring Basis) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Impaired Loans [Member]	'		'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'		'
Assets, fair value adjustment	$9,380	[1]	$4,630	[1]	$20,661	[1]	$27,624	[1]
Other Loans Held for Sale [Member]	'		'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'		'
Assets, fair value adjustment	285		2,833		285		2,844
Other Real Estate [Member]	'		'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'		'
Assets, fair value adjustment	4,114		1,406		7,343		5,919
Other Assets Held for Sale [Member]	'		'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'		'
Assets, fair value adjustment	$100		$76		$7,608		$246
[1]	Impaired loans that are collateral-dependent.

Fair_Value_Accounting_Fair_Val

Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Equity Securities [Member]

Trust Preferred Securities [Member]

Trust Preferred Securities [Member]

Trust Preferred Securities [Member]

Trust Preferred Securities [Member]

Trust Preferred Securities [Member]

Trust Preferred Securities [Member]

Trust Preferred Securities [Member]

Trust Preferred Securities [Member]

Private Equity Investments [Member]

Private Equity Investments [Member]

Visa Derivative [Member]

Visa Derivative [Member]

Collateral Dependent Impaired Loans [Member]

Collateral Dependent Impaired Loans [Member]

Collateral Dependent Impaired Loans [Member]

Collateral Dependent Impaired Loans [Member]

Collateral Dependent Impaired Loans [Member]

Collateral Dependent Impaired Loans [Member]

Other Loans Held for Sale [Member]

Other Loans Held for Sale [Member]

Other Loans Held for Sale [Member]

Other Loans Held for Sale [Member]

Other Loans Held for Sale [Member]

Other Loans Held for Sale [Member]

Other Real Estate [Member]

Other Real Estate [Member]

Other Real Estate [Member]

Other Real Estate [Member]

Other Real Estate [Member]

Other Real Estate [Member]

Other Assets Held for Sale [Member]

Other Assets Held for Sale [Member]

Other Assets Held for Sale [Member]

Other Assets Held for Sale [Member]

Other Assets Held for Sale [Member]

Other Assets Held for Sale [Member]

Collateral Dependent Impaired Loans [Member]

Collateral Dependent Impaired Loans [Member]

Other Loans Held for Sale [Member]

Other Loans Held for Sale [Member]

Other Real Estate [Member]

Other Real Estate [Member]

Other Assets Held for Sale [Member]

Individual Analysis of Each Investment [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Individual Analysis of Each Investment [Member]

Individual Analysis of Each Investee Company [Member]

Probability Model [Member]

Probability Model [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]

Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets, Fair Value Disclosure

$628

'

'

'

$1,785

$1,722

'

'

'

$27,232

$27,745

$4,021

$2,706

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$37,790

$170,693

$338

$9,670

$25,928

$50,070

$4,945

Credit spread embedded in discount rate

'

4.00%

[1]

4.80%

[1]

4.41%

[1]

'

'

4.50%

[1]

5.50%

[1]

5.00%

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount to appraised value

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

[1]

65.00%

[1]

25.00%

[1]

0.00%

[1]

100.00%

[1]

48.00%

[1]

0.00%

[1]

12.00%

[1]

4.00%

[1]

0.00%

[1]

23.00%

[1]

23.00%

[1]

0.00%

[1]

7.00%

[1]

2.00%

[1]

0.00%

[1]

38.00%

[1]

16.00%

[1]

5.00%

[1]

36.00%

[1]

20.00%

[1]

9.00%

[1]

100.00%

[1]

69.00%

[1]

'

'

'

'

'

'

'

Estimated selling costs

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

[1]

10.00%

[1]

7.00%

[1]

0.00%

[1]

10.00%

[1]

7.00%

[1]

0.00%

[1]

10.00%

[1]

7.00%

[1]

0.00%

[1]

10.00%

[1]

7.00%

[1]

0.00%

[1]

10.00%

[1]

7.00%

[1]

0.00%

[1]

10.00%

[1]

7.00%

[1]

0.00%

[1]

10.00%

[1]

7.00%

[1]

0.00%

[1]

10.00%

[1]

10.00%

[1]

'

'

'

'

'

'

'

[1]

The range represents management's best estimate of the high and low of the value that would be assigned to a particular input. For assets measured at fair value on a non-recurring basis, the weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability.

Fair_Value_Accounting_Carrying

Fair Value Accounting (Carrying And Estimated Fair Values Of Financial Instruments Carried On Balance Sheet) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and cash equivalents	$386,402	$469,630
Interest bearing funds with Federal Reserve Bank	750,446	644,528
Interest earning deposits with banks	13,612	24,325
Federal funds sold and securities purchased under resale agreements	70,918	80,975
Trading account assets	12,705	6,113
Mortgage loans held for sale	72,333	45,384
Other loans held for sale	338	10,685
Investment securities available for sale	3,050,257	3,199,358
Loans, net	20,319,190	19,750,238
Non-interest bearing deposits	5,813,809	5,642,751
Federal funds purchased and securities sold under repurchase agreements	107,160	148,132
Long-term debt	2,130,934	2,033,141
Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and cash equivalents	386,402	469,630
Interest bearing funds with Federal Reserve Bank	750,446	644,528
Interest earning deposits with banks	13,612	24,325
Federal funds sold and securities purchased under resale agreements	70,918	80,975
Trading account assets	97	0
Mortgage loans held for sale	0	0
Other loans held for sale	0	0
Investment securities available for sale	51,031	26,716
Private equity investments	0	0
Mutual funds held in Rabbi Trusts	10,817	11,246
Loans, net	0	0
Derivative asset positions	0	0
Trading account liabilities	0	0
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Federal funds purchased and securities sold under repurchase agreements	107,160	148,132
Salary stock units	728	1,764
Long-term debt	0	0
Derivative liability positions	0	0
Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and cash equivalents	0	0
Interest bearing funds with Federal Reserve Bank	0	0
Interest earning deposits with banks	0	0
Federal funds sold and securities purchased under resale agreements	0	0
Trading account assets	12,608	6,113
Mortgage loans held for sale	72,333	45,384
Other loans held for sale	0	0
Investment securities available for sale	2,997,441	3,170,292
Private equity investments	1,094	1,615
Mutual funds held in Rabbi Trusts	0	0
Loans, net	0	0
Derivative asset positions	31,322	40,004
Trading account liabilities	6,264	1,763
Non-interest bearing deposits	5,813,809	5,642,751
Interest bearing deposits	15,177,126	15,244,020
Federal funds purchased and securities sold under repurchase agreements	0	0
Salary stock units	0	0
Long-term debt	2,185,455	2,095,720
Derivative liability positions	31,009	39,436
Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and cash equivalents	0	0
Interest bearing funds with Federal Reserve Bank	0	0
Interest earning deposits with banks	0	0
Federal funds sold and securities purchased under resale agreements	0	0
Trading account assets	0	0
Mortgage loans held for sale	0	0
Other loans held for sale	338	10,685
Investment securities available for sale	1,785	2,350
Private equity investments	27,232	27,745
Mutual funds held in Rabbi Trusts	0	0
Loans, net	20,334,382	19,763,708
Derivative asset positions	0	0
Trading account liabilities	0	0
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Federal funds purchased and securities sold under repurchase agreements	0	0
Salary stock units	0	0
Long-term debt	0	0
Derivative liability positions	4,021	2,706
Carrying Value [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and cash equivalents	386,402	469,630
Interest bearing funds with Federal Reserve Bank	750,446	644,528
Interest earning deposits with banks	13,612	24,325
Federal funds sold and securities purchased under resale agreements	70,918	80,975
Trading account assets	12,705	6,113
Mortgage loans held for sale	72,333	45,384
Other loans held for sale	338	10,685
Investment securities available for sale	3,050,257	3,199,358
Private equity investments	28,326	29,360
Mutual funds held in Rabbi Trusts	10,817	11,246
Loans, net	20,588,566	20,057,798
Derivative asset positions	31,322	40,004
Trading account liabilities	6,264	1,763
Non-interest bearing deposits	5,813,809	5,642,751
Interest bearing deposits	15,175,972	15,234,039
Federal funds purchased and securities sold under repurchase agreements	107,160	148,132
Salary stock units	728	1,764
Long-term debt	2,130,934	2,033,141
Derivative liability positions	35,030	42,142
Estimated Fair Value [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and cash equivalents	386,402	469,630
Interest bearing funds with Federal Reserve Bank	750,446	644,528
Interest earning deposits with banks	13,612	24,325
Federal funds sold and securities purchased under resale agreements	70,918	80,975
Trading account assets	12,705	6,113
Mortgage loans held for sale	72,333	45,384
Other loans held for sale	338	10,685
Investment securities available for sale	3,050,257	3,199,358
Private equity investments	28,326	29,360
Mutual funds held in Rabbi Trusts	10,817	11,246
Loans, net	20,334,382	19,763,708
Derivative asset positions	31,322	40,004
Trading account liabilities	6,264	1,763
Non-interest bearing deposits	5,813,809	5,642,751
Interest bearing deposits	15,177,126	15,244,020
Federal funds purchased and securities sold under repurchase agreements	107,160	148,132
Salary stock units	728	1,764
Long-term debt	2,185,455	2,095,720
Derivative liability positions	$35,030	$42,142

Derivative_Instruments_Narrati

Derivative Instruments (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]	'	'	'	'
Cash flow hedge gain (loss) to be reclassified within 12 months	($447,000)	'	'	'
Remaining unamortized deferred gain (loss) balance of all previously terminated cash flow hedges	-1,200,000	'	'	-1,600,000
Remaining deferred gain (loss) balance on all previously terminated fair value hedges	8,400,000	'	'	10,700,000
Deferred gain balance on terminated fair value hedges expected to be reclassified from long-term debt	3,100,000	'	'	'
Derivative, fair value	'	'	4,000,000	2,700,000
Gain (loss) on sale of outstanding commitments	-1,200,000	'	'	'
Deferred gains (loss) on discontinuation of cash flow hedge reclassified to earnings	2,300,000	2,500,000	'	'
Fixed Rate Residential Mortgage [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Commitments to fund fixed-rate mortgage loans	78,000,000	'	'	65,000,000
Unrealized gain on fair value of fixed-rate mortgage loans to customers	531,000	-682,000	'	'
Sale of outstanding commitments	105,500,000	'	'	92,000,000
Interest Rate Swap [Member] | Customer Related Interest Rate Risk [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Notional amount of interest rate swap contracts	1,080,000,000	'	'	107,800,000
Federal Funds Sold [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Federal funds sold	68,100,000	'	'	'
Federal Funds Sold, Counterparty with CCC [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Federal funds sold	$3,800,000	'	'	'

Derivative_Instruments_Impact_

Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) (Not Designated As Hedging Instruments [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Assets [Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative assets	$31,322	$40,004
Other Assets [Member] | Interest Rate Contracts [Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative assets	30,184	38,482
Other Assets [Member] | Mortgage Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative assets	1,138	1,522
Other Assets [Member] | Visa Derivative[Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative assets	0	0
Other Liabilities [Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative liabilities	35,030	42,142
Other Liabilities [Member] | Interest Rate Contracts [Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative liabilities	30,689	39,436
Other Liabilities [Member] | Mortgage Derivatives [Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative liabilities	320	0
Other Liabilities [Member] | Visa Derivative[Member]	'	'
Derivative [Line Items]	'	'
Fair value of derivative liabilities	$4,021	$2,706

Derivative_Instruments_Effect_

Derivative Instruments (Effect Of Cash Flow Hedges On Consolidated Statements Of Income) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]	'	'	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	($69)	($69)	($206)	($205)

Derivative_Instruments_Effect_1

Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) (Not Designated As Hedging Instruments [Member], USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Derivative [Line Items]	'		'		'		'
Amount of Gain (Loss) Recognized in Income on Derivative	$116		($6,585)		($255)		($1,802)
Other Non-Interest Income [Member] | Interest Rate Contracts [Member]	'		'		'		'
Derivative [Line Items]	'		'		'		'
Amount of Gain (Loss) Recognized in Income on Derivative	65	[1]	221	[1]	449	[1]	63	[1]
Mortgage Banking Income [Member] | Mortgage Derivatives [Member]	'		'		'		'
Derivative [Line Items]	'		'		'		'
Amount of Gain (Loss) Recognized in Income on Derivative	$51	[2]	($6,806)	[2]	($704)	[2]	($1,865)	[2]
[1]	Gain (loss) represents net fair value adjustments (including credit related adjustments) for customer swaps and offsetting positions.
[2]	Gain (loss) represents net fair value adjustments recorded for interest rate lock commitments and commitments to sell mortgage loans to third party investors.

Net_Income_Per_Common_Share_Sc

Net Income Per Common Share (Schedule Of Basic And Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic Earnings (Loss) Per Share	'	'	'	'
Net income available to common shareholders	$44,229	$37,188	$134,399	$82,704
Weighted average common shares outstanding	139,043	136,671	138,989	123,652
Basic net income per common share	$0.32	$0.27	$0.97	$0.67
Diluted Earnings (Loss) Per Share	'	'	'	'
Net income available to common shareholders	$44,229	$37,188	$134,399	$82,704
Weighted average common shares outstanding	139,043	136,671	138,989	123,652
Potentially dilutive shares from assumed exercise of securities or other contracts to purchase Common Stock	683	426	611	8,823
Weighted average number of diluted common shares	139,726	137,097	139,600	132,476
Diluted net income per common share	$0.32	$0.27	$0.96	$0.62

Net_Income_Per_Common_Share_Na

Net Income Per Common Share (Narrative) (Details)	0 Months Ended	9 Months Ended				12 Months Ended
	Apr. 24, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	15-May-13	Dec. 31, 2010
						Public Offering [Member]
						tMEDS [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'	'	'
Stock split, conversion ratio	0.1429	'	'	'	'	'
Units issued	'	'	'	'	'	13,800,000
Common stock, shares issued	'	139,877,971	'	139,720,701	17,600,000	'
Number of anti-dilutive shares	'	3,200,000	3,600,000	'	'	'

Sharebased_Compensation_Detail

Share-based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Share-based compensation expense	$2,800,000	$2,300,000	$7,500,000	$5,800,000
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Share equivalents ratio	1	'	1	'
Options outstanding	2,615,051	'	2,615,051	'
Weighted-average exercise price, options	$44.48	'	$44.48	'
Other equity compensation, shares granted	'	'	0	'
Restricted Stock Units (RSUs) [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Share equivalents ratio	2	'	2	'
Vesting period (in years)	'	'	'3 years	'
Other equity compensation, shares granted	'	'	407,374	'
Weighted-average exercise price, shares granted during period	'	'	$23.76	'
Performance Shares [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Other equity compensation, shares granted	'	'	67,157	'
Market Restricted Stock Units (MRSUs) [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Other equity compensation, shares granted	'	'	90,117	'
Non-Vested Synovus Shares And Restricted Share Units [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Other equity compensation, non-vested shares outstanding	1,084,659	'	1,084,659	'
Weighted-average exercise price, non-vested shares outstanding	$20.59	'	$20.59	'
Salary Stock Units (SSUs) [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Other equity compensation, shares granted	'	'	30,786	'
Total fair value of units granted	'	'	$728,000	'
2013 Omnibus Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Equivalents authorized	7,550,907	'	7,550,907	'
Shares of authorized but unissued common stock reserved for future grants	8,571,429	'	8,571,429	'
Contractual term (years)	'	'	'10 years	'
2013 Omnibus Plan [Member] | Minimum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period (in years)	'	'	'2 years	'
2013 Omnibus Plan [Member] | Maximum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period (in years)	'	'	'5 years	'

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]	'	'
Valuation allowance	$15,200,000	$14,600,000
Increase in valuation allowance	621,000	'
Net deferred tax asset	656,151,000	744,646,000
No Expiration Date [Member]	'	'
Income Tax Contingency [Line Items]	'	'
Net deferred tax asset	186,100,000	'
Period from Twenty Twety Eight Throught Twenty Thirty Two [Member]	'	'
Income Tax Contingency [Line Items]	'	'
Operating loss carryforwards, subject to expiration	378,900,000	'
Period from Twenty Thirteen Through Twenty Thirty Two [Member]	'	'
Income Tax Contingency [Line Items]	'	'
Operating loss carryforwards, subject to expiration	27,100,000	'
State and Local Jurisdiction [Member] | Period from Twenty Eighteen Through Twenty Thirty Two [Member]	'	'
Income Tax Contingency [Line Items]	'	'
Operating loss carryforwards, subject to expiration	54,000,000	'
Domestic Tax Authority [Member]	'	'
Income Tax Contingency [Line Items]	'	'
Tax credit carryforwards, alternative minimum tax	$25,300,000	'

Legal_Proceedings_Details

Legal Proceedings (Details) (USD $)	Sep. 30, 2014	Oct. 04, 2013	Aug. 23, 2014
		Securities Class Action Settlement Payment [Member]	Posting Order Litigation Settlement Payment [Member]
Loss Contingencies [Line Items]	'	'	'
Aggregate range of reasonably possible losses, minimum	$0	'	'
Aggregate range of reasonably possible losses, maximum	15,000,000	'	'
Litigation settlement amount	'	-11,800,000	-3,750,000
Litigation settlement expenses	'	'	$150,000