Synovus Financial (SNV) 10-Q 6 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	SYNOVUS FINANCIAL CORP
Entity Central Index Key	18349
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		133,203,469

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
ASSETS
Cash and cash equivalents	$429,338	$485,489
Interest bearing funds with Federal Reserve Bank	1,263,886	721,362
Interest earning deposits with banks	6,871	11,810
Federal funds sold and securities purchased under resale agreements	80,772	73,111
Trading account assets, at fair value	20,002	13,863
Mortgage loans held for sale, at fair value	89,245	63,328
Investment securities available for sale, at fair value	3,130,041	3,041,406
Loans, net of deferred fees and costs	21,106,213	21,097,699
Allowance for loan losses	-253,371	-261,317
Loans, net	20,852,842	20,836,382
Premises and equipment, net	451,843	455,235
Goodwill	24,431	24,431
Other real estate	74,791	85,472
Deferred tax asset, net	589,190	622,464
Other assets	620,532	616,878
Total assets	27,633,784	27,051,231
LIABILITIES AND SHAREHOLDERS' EQUITY
Non-interest bearing deposits	6,251,393	6,228,472
Interest bearing deposits, excluding brokered deposits	14,251,510	13,660,830
Brokered deposits	1,604,946	1,642,398
Total deposits	22,107,849	21,531,700
Federal funds purchased and securities sold under repurchase agreements	125,323	126,916
Long-term debt	2,189,769	2,140,319
Other liabilities	180,208	211,026
Total liabilities	24,603,149	24,009,961
Shareholders' Equity:
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at March 31, 2015 and December 31, 2014	125,980	125,980
Common stock - $1.00 par value. Authorized 342,857,143 shares; 140,328,807 issued at March 31, 2015 and 139,950,422 issued at December 31, 2014; 133,929,630 outstanding at March 31, 2015 and 136,122,843 outstanding at December 31, 2014	140,329	139,950
Additional paid-in capital	2,976,882	2,960,825
Treasury stock, at cost – 6,399,177 shares at March 31, 2015 and 3,827,579 shares at December 31, 2014	-261,402	-187,774
Accumulated other comprehensive loss, net	-3,651	-12,605
Retained earnings	52,497	14,894
Total shareholders' equity	3,030,635	3,041,270
Total liabilities and shareholders' equity	$27,633,784	$27,051,231

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, shares outstanding	5,200,000	5,200,000
Common stock, par value (per share)	$1	$1
Common stock, shares authorized	342,857,143	342,857,143
Common stock, shares issued	140,328,807	139,950,422
Common stock, shares outstanding	133,929,630	136,122,843
Treasury stock, shares at cost	6,399,177	3,827,579

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans, including fees	$215,269	$211,343
Investment securities available for sale	13,943	15,257
Trading account assets	107	161
Mortgage loans held for sale	632	402
Federal Reserve Bank balances	645	527
Other earning assets	805	692
Total interest income	231,401	228,382
Interest expense:
Deposits	14,819	14,221
Federal funds purchased and securities sold under repurchase agreements	43	77
Long-term debt	13,276	13,570
Total interest expense	28,138	27,868
Net interest income	203,263	200,514
Provision for loan losses	4,397	9,511
Net interest income after provision for loan losses	198,866	191,003
Non-interest income:
Service charges on deposit accounts	19,133	19,214
Fiduciary and asset management fees	11,571	11,033
Brokerage revenue	7,251	6,213
Mortgage banking income	6,484	3,511
Bankcard fees	8,077	7,518
Investment securities gains, net	725	1,331
Other fee income	5,246	4,863
Gain on sale of Memphis branches, net	0	5,789
Other non-interest income	7,367	10,710
Total non-interest income	65,854	70,182
Non-interest expense:
Salaries and other personnel expense	96,488	93,445
Net occupancy and equipment expense	26,172	26,056
Third-party processing expense	10,343	10,097
FDIC insurance and other regulatory fees	6,957	9,645
Professional fees	5,594	7,677
Advertising expense	3,443	2,477
Foreclosed real estate expense, net	9,496	5,681
Visa indemnification charges	375	396
Restructuring charges, net	-107	8,577
Other operating expenses	20,147	20,110
Total non-interest expense	178,908	184,161
Income before income taxes	85,812	77,024
Income tax expense	31,849	28,608
Net income	53,963	48,416
Dividends on preferred stock	2,559	2,559
Net income available to common shareholders	$51,404	$45,857
Net income per common share, basic	$0.38	$0.33
Net income per common share, diluted	$0.38	$0.33
Weighted average common shares outstanding, basic	134,933	138,932
Weighted average common shares outstanding, diluted	135,744	139,504

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income, Before-tax Amount	$85,812	$77,024
Net income, Tax (Expense) Benefit	-31,849	-28,608
Net income	53,963	48,416
Reclassification adjustment for losses realized in net income, Before-tax Amount	112	112
Reclassification adjustment for losses realized in net income, Tax (Expense) Benefit	-43	-43
Reclassification adjustment for losses realized in net income, Net of Tax Amount	-69	-69
Net unrealized gains on investment securities available for sale: Before-tax Amount
Reclassification adjustment for net gains realized in net income, Before-tax Amount	-725	-1,331
Net unrealized gains arising during the period, Before-tax Amount	15,211	18,843
Net unrealized gains, Before-tax Amount	14,486	17,512
Net unrealized gains on investment securities available for sale: Tax (Expense) Benefit
Reclassification adjustment for net gains realized in net income, Tax (Expense) Benefit	281	513
Net unrealized gains arising during the period, Tax (Expense) Benefit	-5,856	-7,255
Net unrealized gains, Tax (Expense) Benefit	-5,575	-6,742
Net unrealized gains on investment securities available for sale: Net of Tax Amount
Reclassification adjustment for net gains realized in net income, Net of Tax Amount	-444	-818
Net unrealized gains arising during the period, Net of Tax Amount	9,355	11,588
Net unrealized gains, Net of Tax Amount	8,911	10,770
Post-retirement unfunded health benefit: Before-tax Amount
Reclassification adjustment for gains realized in net income, Before-tax Amount	-42	-72
Post-retirement unfunded health benefit: Tax (Expense) Benefit
Reclassification adjustment for gains realized in net income, Tax (Expense) Benefit	16	28
Post-retirement unfunded health benefit: Net of Tax Amount
Reclassification adjustment for gains realized in net income, Net of Tax Amount	-26	-44
Other comprehensive income, Before-tax Amount	14,556	17,552
Other comprehensive income, Tax (Expense) Benefit	-5,602	-6,757
Other comprehensive income, Net of Tax Amount	8,954	10,795
Comprehensive income, Net of Tax Amount	$62,917	$59,211

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (USD $)	Total	Series C Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Deficit) [Member]	Retained Earnings (Deficit) [Member]
In Thousands, unless otherwise specified			Series C Preferred Stock [Member]						Series C Preferred Stock [Member]
Balance at Dec. 31, 2013	$2,948,985		$125,862	$139,721	$2,976,348	($114,176)	($41,258)	($137,512)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,416							48,416
Other comprehensive income, net of income taxes	10,795						10,795
Cash dividends declared on common stock	-9,728							-9,728
Cash dividends paid on Series C Preferred Stock	-2,559				-2,559
Issuance of stock, net of issuance costs	118		118
Restricted share unit activity	-468			33	-501
Stock options exercised	539			32	507
Share-based compensation net tax benefit	170
Share-based compensation expense	2,228				2,228
Balance at Mar. 31, 2014	2,998,496		125,980	139,786	2,976,193	-114,176	-30,463	-98,824
Balance at Dec. 31, 2014	3,041,270		125,980	139,950	2,960,825	-187,774	-12,605	14,894
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,963							53,963
Other comprehensive income, net of income taxes	8,954						8,954
Cash dividends declared on common stock	-13,434							-13,434
Cash dividends paid on Series C Preferred Stock		-2,559							-2,559
Issuance of stock, net of issuance costs	-59,113				14,515	-73,628
Restricted share unit activity	-4,418			274	-4,325			-367
Stock options exercised	1,692			105	1,587
Share-based compensation net tax benefit	1,046				1,046
Share-based compensation expense	3,234				3,234
Balance at Mar. 31, 2015	$3,030,635		$125,980	$140,329	$2,976,882	($261,402)	($3,651)	$52,497

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$0.10	$0.07

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$53,963	$48,416
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,397	9,511
Depreciation, amortization, and accretion, net	13,799	12,312
Deferred income tax expense	28,718	25,757
Increase in trading account assets	-6,139	-11,695
Originations of mortgage loans held for sale	-207,530	-129,160
Proceeds from sales of mortgage loans held for sale	184,712	126,688
Gain on sales of mortgage loans held for sale, net	-3,100	-1,898
Increase in other assets	-6,947	-8,019
(Decrease) increase in other liabilities	-30,818	19,554
Investment securities gains, net	-725	-1,331
Losses and write-downs on other real estate, net	7,275	4,752
Share-based compensation expense	3,234	2,228
Gain on sale of Memphis branches, net	0	-5,789
Gain on sale of branch property	0	-3,116
Other, net	-2,052	-940
Net cash provided by operating activities	38,787	87,270
Investing Activities
Net cash used in dispositions	0	-90,571
Net decrease in interest earning deposits with banks	4,939	15,186
Net (increase) decrease in federal funds sold and securities purchased under resale agreements	-7,661	4,878
Net increase in interest bearing funds with Federal Reserve Bank	-542,524	-240,215
Proceeds from maturities and principal collections of investment securities available for sale	155,005	117,867
Proceeds from sales of investment securities available for sale	32,419	20,815
Purchases of investment securities available for sale	-265,707	-57,709
Proceeds from sales of loans and principal repayments on other loans held for sale	12,507	29,804
Proceeds from sale of other real estate	8,785	10,000
Net increase in loans	-36,336	-243,267
Net increase in premises and equipment	-5,221	-7,955
Proceeds from sale of other assets held for sale	351	241
Net cash used in investing activities	-643,443	-440,926
Financing Activities
Net increase in demand and savings deposits	411,991	251,914
Net increase in certificates of deposit	164,184	13,561
Net (decrease) increase in federal funds purchased and securities sold under repurchase agreements	-1,593	16,814
Principal repayments on long-term debt	-375,039	-325,615
Proceeds from issuance of long-term debt	425,000	400,000
Dividends paid to common shareholders	-13,434	-9,728
Dividends paid to preferred shareholders	-2,559	-2,559
Stock options exercised	1,692	539
Repurchases of common stock	-59,113	0
Excess tax benefit from share-based compensation	1,794	186
Restricted stock activity	-4,418	-468
Net cash provided by financing activities	548,505	344,644
Decrease in cash and cash equivalents	-56,151	-9,012
Cash and cash equivalents at beginning of period	485,489	469,630
Cash and cash equivalents at end of period	429,338	460,618
Supplemental Cash Flow Information
Income tax payments (refunds), net	338	-12
Interest paid	27,875	29,503
Non-cash Investing Activities:
Loans foreclosed and transferred to other real estate	5,378	12,881
Loans transferred to other loans held for sale at fair value	10,100	24,505
Securities purchased during the period but settled after period-end	0	10,227
Dispositions:
Fair value of non-cash assets sold	0	-100,982
Fair value of liabilities sold	$0	($191,553)

Significant_Accounting_Policie

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
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' 2014 Form 10-K. There have been no significant changes to the accounting policies as disclosed in Synovus' 2014 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; contingent liabilities related to legal matters; and the deferred tax assets valuation allowance.
	Cash and Cash Equivalents
	Cash and cash equivalents consist of cash and due from banks. At March 31, 2015 and December 31, 2014, $125 thousand 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. At March 31, 2015 and December 31, 2014, interest bearing funds with the Federal Reserve Bank included $81.5 million and $89.7 million, respectively, on deposit to meet Federal Reserve Bank requirements. Interest earning deposits with banks include $7.0 million and $7.1 million at March 31, 2015 and December 31, 2014, respectively, which is pledged as collateral in connection with certain letters of credit. Federal funds sold include $67.5 million at March 31, 2015 and December 31, 2014, 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
	During 2014, the FASB issued the following ASUs, all of which became effective January 1, 2015:
	•	ASU 2014-01, Investments-Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued amended guidance which permits Synovus to make an accounting policy election to account for its investments in qualified affordable housing projects using a proportional amortization method, if certain conditions are met, and to present the amortization as a component of income tax expense. The amended guidance would be applied retrospectively to all periods presented and is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Regardless of the policy election, the amended guidance, where disclosed, enables the users of the financial statements to understand the nature of investments in qualified affordable housing projects and the effect of the measurement of the investments in qualified affordable housing projects and the related tax credits on Synovus’ financial position and results of operations.
	Synovus adopted the amended guidance on January 1, 2015, and did not make an accounting policy election to apply the proportional amortization method for its investments in qualified affordable housing projects because the impact to the consolidated financial statements was insignificant. Therefore, the adoption did not have an impact on Synovus’ consolidated financial statements. At March 31, 2015, the aggregate carrying value of Synovus' investments in LIHTC partnerships was $8.7 million. See Note 18 "Variable Interest Entities" to the consolidated financial statements of Synovus' 2014 Form 10-K for additional information regarding these investments.
	Additionally, adoption of the following standards effective January 1, 2015 did not have a significant impact on Synovus’ consolidated financial statements.
	•	ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure
	•	ASU 2014-12, Accounting for Share-Based Payments when the Terms of an Award Provide that a Performance Target Could be Achieved after the Requisite Service Period
	•	ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures
	•	ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity
	•	ASU 2014-04, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40), Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
	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	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Share Repurchase Program	Note 2 - Share Repurchase Program
	On October 21, 2014, Synovus announced a $250 million share repurchase program, which will expire on October 23, 2015. As of March 31, 2015, Synovus had repurchased a total of $147.2 million or 5.6 million shares of common stock under the share repurchase program through a combination of share repurchases under the accelerated share repurchase (ASR) agreement described below and open market transactions.
	During October 2014, Synovus entered into an ASR agreement to purchase $75.0 million of Synovus common stock under the share repurchase program. As of December 31, 2014, Synovus had repurchased 2,510,460 shares under the ASR agreement. During January 2015, Synovus repurchased 391,612 shares upon completion of the ASR agreement. Additionally, since October 2014 through March 31, 2015, Synovus has repurchased $72.2 million or 2,683,755 shares of common stock through open market transactions including $59.1 million or 2,179,986 shares of common stock repurchased during the first quarter of 2015.

Reverse_Stock_Split_and_Increa

Reverse Stock Split and Increase in Number of Authorized Common Shares	3 Months Ended
	Mar. 31, 2015
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 was proportionately reduced from 2.4 billion shares to 342.9 million shares.

Sale_of_Branches

Sale of Branches	3 Months Ended
	Mar. 31, 2015
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 three months ended March 31, 2014 reflect a pre-tax gain, net of associated costs, of $5.8 million relating to this transaction.

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014 are summarized below.
			March 31, 2015
	(in thousands)		Amortized Cost(1)			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	43,139		479			—			43,618
	U.S. Government agency securities		24,515			980			—			25,495
	Securities issued by U.S. Government sponsored enterprises		81,115			664			—			81,779
	Mortgage-backed securities issued by U.S. Government agencies		169,098			3,112			(345	)		171,865
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,186,379			27,536			(6,246	)		2,207,669
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		563,513			6,086			(1,028	)		568,571
	State and municipal securities		4,941			168			(1	)		5,108
	Equity securities		3,228			3,945			—			7,173
	Other investments		19,132			37			(406	)		18,763
	Total investment securities available for sale		$	3,095,060		43,007			(8,026	)		3,130,041
			December 31, 2014
	(in thousands)		Amortized Cost(1)			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	42,636		190			—			42,826
	U.S. Government agency securities		26,426			898			—			27,324
	Securities issued by U.S. Government sponsored enterprises		81,332			710			—			82,042
	Mortgage-backed securities issued by U.S. Government agencies		177,678			2,578			(440	)		179,816
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,250,897			19,915			(9,131	)		2,261,681
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		414,562			4,856			(2,342	)		417,076
	State and municipal securities		5,024			183			(1	)		5,206
	Equity securities		3,228			3,520						6,748
	Other investments		19,121			7			(441	)		18,687
	Total investment securities available for sale		$	3,020,904		32,857			(12,355	)		3,041,406
	(1)	Amortized cost is adjusted for other-than-temporary impairment charges in 2014, which have been recognized in the consolidated statements of income and were considered inconsequential.
	At March 31, 2015 and December 31, 2014, investment securities with a carrying value of $2.05 billion and $2.12 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 March 31, 2015 and December 31, 2014 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 prior to the respective securities recovery of all such unrealized losses.
	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 March 31, 2015, Synovus had one investment security in a loss position for less than twelve months and thirty-five 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 March 31, 2015 and December 31, 2014, are presented below.
		March 31, 2015
		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
	Mortgage-backed securities issued by U.S. Government agencies	4,473			11			20,678			334		25,151	345
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—			—			732,387			6,246		732,387	6,246
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—			—			82,318			1,028		82,318	1,028
	State and municipal securities	—			—			46			1		46	1
	Other investments	—			—			3,726			406		3,726	406
	Total	$	4,473		11			839,155			8,015		843,628	8,026
		31-Dec-14
		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
	Mortgage-backed securities issued by U.S. Government agencies	—			—			21,488			440		21,488	440
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	251,134			763			798,282			8,368		1,049,416	9,131
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	20,338			61			119,172			2,281		139,510	2,342
	State and municipal securities	—			—			45			1		45	1
	Other investments	—			—			3,680			441		3,680	441
	Total	$	271,472		824			942,667			11,531		1,214,139	12,355
	The amortized cost and fair value by contractual maturity of investment securities available for sale at March 31, 2015 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 March 31, 2015
	(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	$	18,286		24,853			—			—		—	43,139
	U.S. Government agency securities	78			12,001			12,436			—		—	24,515
	Securities issued by U.S. Government sponsored enterprises	—			81,115			—			—		—	81,115
	Mortgage-backed securities issued by U.S. Government agencies	—			—			—			169,098		—	169,098
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	134			1,201			1,792,674			392,370		—	2,186,379
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—			—			—			563,513		—	563,513
	State and municipal securities	165			2,067			—			2,709		—	4,941
	Equity securities	—			—			—			—		3,228	3,228
Other investments	—			—			15,000			2,000		2,132	19,132
Total amortized cost	$	18,663		121,237			1,820,110			1,129,690		5,360	3,095,060
Fair Value
U.S. Treasury securities	$	18,286		25,332			—			—		—	43,618
U.S. Government agency securities	80			12,412			13,003			—		—	25,495
Securities issued by U.S. Government sponsored enterprises	—			81,779			—			—		—	81,779
Mortgage-backed securities issued by U.S. Government agencies	—			—			—			171,865		—	171,865
Mortgage-backed securities issued by U.S. Government sponsored enterprises	140			1,271			1,801,124			405,134		—	2,207,669
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—			—			—			568,571		—	568,571
State and municipal securities	166			2,106			—			2,836		—	5,108
Equity securities	—			—			—			—		7,173	7,173
Other investments	—			—			15,037			1,653		2,073	18,763
Total fair value	$	18,672		122,900			1,829,164			1,150,059		9,246	3,130,041
Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the three months ended March 31, 2015 and 2014 are presented below. Other-than-temporary impairment charges of $88 thousand are included in gross realized losses for the three months ended March 31, 2014. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale.
		Three Months Ended March 31,
(in thousands)		2015			2014
Proceeds from sales of investment securities available for sale		$	32,419		20,815
Gross realized gains		725			1,419
Gross realized losses		—			(88	)
Investment securities gains, net		$	725		1,331

Restructuring_Charges

Restructuring Charges	3 Months Ended
	Mar. 31, 2015
Restructuring Charges [Abstract]
Restructuring Charges	Note 6 - Restructuring Charges
	For the three months ended March 31, 2015 and 2014 total restructuring charges consist of the following components:
		Three Months Ended March 31,
	(in thousands)	2015			2014
	Severance charges	$	—		8,047
	Gain on sale of assets held for sale, net	(157		)	—
	Professional fees and other charges	50			530
	Total restructuring charges, net	$	(107	)	8,577
	For the three months ended March 31, 2015, Synovus recorded net gains of $157 thousand on the sale of certain branch locations and recorded additional expense of $50 thousand associated with the 2014 branch closings. Restructuring charges for the three months ended March 31, 2014 related primarily to expense savings initiatives that were approved during 2014 with an expected completion date of mid-2015. The initiatives include the consolidation or closing of certain branch locations as well as workforce reductions. Severance charges for the three months ended March 31, 2014 consisted of estimated involuntary termination benefits for targeted staff reductions identified during 2014. These termination benefits were 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, substantially all of the professional fees and other charges for the three months ended March 31, 2014 consist of professional fees incurred in connection with an organizational restructuring implemented during 2014.
	The following table presents aggregate activity associated with accruals that resulted from restructuring charges during the three months ended March 31, 2015 and 2014:
		Severance Charges			Lease Termination Charges		Total
	(in thousands)
	Balance at December 31, 2013	$	1,572		1,383		2,955
	Accruals for efficiency initiatives	8,047			—		8,047
	Payments	(1,931		)	(1,289	)	(3,220	)
	Balance at March 31, 2014	7,688			94		7,782
	Balance at December 31, 2014	3,291			5,539		8,830
	Payments	(521		)	(221	)	(742	)
	Balance at March 31, 2015	$	2,770		5,318		8,088
	All professional fees and other charges were paid in the years that they were incurred. No other restructuring charges resulted in payment accruals.

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014.
	Current, Accruing Past Due, and Non-accrual Loans
		March 31, 2015
	(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	$	5,201,493			2,579		211		2,790		19,780			5,224,063
	1-4 family properties	1,096,543				3,954		291		4,245		22,827			1,123,615
	Land acquisition	526,185				1,704		4		1,708		31,444			559,337
	Total commercial real estate	6,824,221				8,237		506		8,743		74,051			6,907,015
	Commercial, financial and agricultural	6,155,867				17,834		2,410		20,244		42,060			6,218,171
	Owner-occupied	4,050,333				7,704		—		7,704		31,626			4,089,663
	Total commercial and industrial	10,206,200				25,538		2,410		27,948		73,686			10,307,834
	Home equity lines	1,647,045				5,301		759		6,060		18,933			1,672,038
	Consumer mortgages	1,667,761				9,276		—		9,276		25,351			1,702,388
	Credit cards	239,150				1,767		1,340		3,107		—			242,257
	Other retail	299,529				2,299		10		2,309		2,211			304,049
	Total retail	3,853,485				18,643		2,109		20,752		46,495			3,920,732
	Total loans	$	20,883,906			52,418		5,025		57,443		194,232			21,135,581	(1	)
		December 31, 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	$	5,187,200			1,851		—		1,851		20,720			5,209,771
	1-4 family properties	1,106,111				4,067		432		4,499		24,197			1,134,807
	Land acquisition	540,932				363		—		363		34,375			575,670
	Total commercial real estate	6,834,243				6,281		432		6,713		79,292			6,920,248
	Commercial, financial and agricultural	6,172,220				9,979		1,790		11,769		40,359			6,224,348
	Owner-occupied	4,016,997				6,404		225		6,629		26,099			4,049,725
	Total commercial and industrial	10,189,217				16,383		2,015		18,398		66,458			10,274,073
	Home equity lines	1,659,869				6,992		703		7,695		16,434			1,683,998
	Consumer mortgages	1,648,145				12,626		12		12,638		33,278			1,694,061
	Credit cards	250,304				1,971		1,374		3,345		—			253,649
	Other retail	297,703				2,361		101		2,462		2,295			302,460
	Total retail	3,856,021				23,950		2,190		26,140		52,007			3,934,168
	Total loans	$	20,879,481			46,614		4,637		51,251		197,757			21,128,489	(2	)
	(1)Total before net deferred fees and costs of $29.4 million.
	(2)Total before net deferred fees and costs of $30.8 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 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
		March 31, 2015
	(in thousands)	Pass				Special		Substandard(1)		Doubtful(2)		Loss			Total
						Mention
	Investment properties	$	4,959,969			156,878		107,216		—		—			5,224,063
	1-4 family properties	956,789				74,830		84,726		7,270		—			1,123,615
	Land acquisition	456,175				47,259		55,318		585		—			559,337
	Total commercial real estate	6,372,933				278,967		247,260		7,855		—			6,907,015
	Commercial, financial and agricultural	5,956,395				136,454		115,881		9,363		78		(3)	6,218,171
	Owner-occupied	3,848,237				84,320		156,334		327		445		(3)	4,089,663
	Total commercial and industrial	9,804,632				220,774		272,215		9,690		523			10,307,834
	Home equity lines	1,644,215				—		24,001		1,793		2,029		(3)	1,672,038
	Consumer mortgages	1,669,848				—		30,358		2,056		126		(3)	1,702,388
	Credit cards	240,917				—		455		—		885		(4)	242,257
	Other retail	300,846				—		3,079		32		92		(3)	304,049
	Total retail	3,855,826				—		57,893		3,881		3,132			3,920,732
	Total loans	$	20,033,391			499,741		577,368		21,426		3,655			21,135,581	(5	)
		31-Dec-14
	(in thousands)	Pass				Special		Substandard(1)		Doubtful(2)		Loss			Total
						Mention
	Investment properties	$	4,932,440			174,466		102,865		—		—			5,209,771
	1-4 family properties	944,646				86,072		96,392		7,697		—			1,134,807
Land acquisition	460,813				52,026		62,101		730		—			575,670
Total commercial real estate	6,337,899				312,564		261,358		8,427		—			6,920,248
Commercial, financial and agricultural	5,945,725				145,779		123,225		9,539		80		(3)	6,224,348
Owner-occupied	3,792,261				95,647		161,045		327		445		(3)	4,049,725
Total commercial and industrial	9,737,986				241,426		284,270		9,866		525			10,274,073
Home equity lines	1,659,794				—		20,043		2,009		2,152		(3)	1,683,998
Consumer mortgages	1,653,491				—		37,656		2,654		260		(3)	1,694,061
Credit cards	252,275				—		495		—		879		(4)	253,649
Other retail	298,991				—		3,339		32		98		(3)	302,460
Total retail	3,864,551				—		61,533		4,695		3,389			3,934,168
Total loans	$	19,940,436			553,990		607,161		22,988		3,914			21,128,489	(6	)
(1) Includes $170.5 million and $170.9 million of non-accrual Substandard loans at March 31, 2015 and December 31, 2014, 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 $29.4 million.
(6)Total before net deferred fees and costs of $30.8 million.
The following table details the changes in the allowance for loan losses by loan segment for the three months ended March 31, 2015 and 2014.
Allowance for Loan Losses and Recorded Investment in Loans
	As Of and For The Three Months Ended March 31, 2015
(in thousands)	Commercial Real Estate				Commercial & Industrial		Retail		Unallocated		Total
Allowance for loan losses:
Beginning balance	$	101,471			118,110		41,736		—		261,317
Charge-offs	(7,440		)		(5,272	)	(7,912	)	—		(20,624	)
Recoveries	3,941				2,266		2,074		—		8,281
Provision for loan losses	(3,764		)		2,702		5,459		—		4,397
Ending balance	$	94,208			117,806		41,357		—		253,371
Ending balance: individually evaluated for impairment	18,558				9,411		1,037		—		29,006
Ending balance: collectively evaluated for impairment	$	75,650			108,395		40,320		—		224,365
Loans:
Ending balance: total loans(1)	$	6,907,015			10,307,834		3,920,732		—		21,135,581
Ending balance: individually evaluated for impairment	237,167				130,197		41,321		—		408,685
Ending balance: collectively evaluated for impairment	$	6,669,848			10,177,637		3,879,411		—		20,726,896
	As Of and For The Three Months Ended March 31, 2014
(in thousands)	Commercial Real Estate				Commercial & Industrial		Retail		Unallocated		Total
Allowance for loan losses:
Beginning balance	$	127,012			116,069		41,479		23,000		307,560
Allowance for loan losses of sold loans	(281		)		(398	)	(340	)	—		(1,019	)
Charge-offs	(7,946		)		(8,036	)	(6,293	)	—		(22,275	)
Recoveries	2,227				1,953		2,914		—		7,094
Provision for loan losses	5,943				18,758		7,810		(23,000	)	9,511
Ending balance	$	126,955			128,346		45,570		—		300,871
Ending balance: individually evaluated for impairment	42,894				20,678		1,595		—		65,167
Ending balance: collectively evaluated for impairment	$	84,061			107,668		43,975		—		235,704
Loans:
Ending balance: total loans(2)	$	6,587,254			9,961,281		3,638,905		—		20,187,440
Ending balance: individually evaluated for impairment	481,684				220,376		52,243		—		754,303
Ending balance: collectively evaluated for impairment	$	6,105,570			9,740,905		3,586,662		—		19,433,137
(1)Total before net deferred fees and costs of $29.4 million.
(2)Total before net deferred fees and costs of $28.4 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 tables below summarize impaired loans (including accruing TDRs) as of March 31, 2015 and December 31, 2014.
Impaired Loans (including accruing TDRs)
	March 31, 2015								Three Months Ended March 31, 2015
(in thousands)	Recorded Investment				Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded
Investment properties	$	14,636			19,382		—		14,964		—
1-4 family properties	2,730				10,080		—		2,888		—
Land acquisition	22,359				63,276		—		20,814		—
Total commercial real estate	39,725				92,738		—		38,666		—
Commercial, financial and agricultural	6,504				9,187		—		5,993		—
Owner-occupied	18,753				21,451		—		17,558		—
Total commercial and industrial	25,257				30,638		—		23,551		—
Home equity lines	—				—		—		—		—
Consumer mortgages	995				2,065		—		995		—
Credit cards	—				—		—		—		—
Other retail	—				—		—		—		—
Total retail	995				2,065		—		995		—
Total impaired loans with no	$	65,977			125,441		—		63,212		—
related allowance recorded
With allowance recorded
Investment properties	96,020				98,622		7,374		86,415		631
1-4 family properties	65,228				66,010		7,594		72,534		356
Land acquisition	36,194				36,416		3,590		44,493		283
Total commercial real estate	197,442				201,048		18,558		203,442		1,270
Commercial, financial and agricultural	44,477				44,615		6,556		54,651		369
Owner-occupied	60,463				60,467		2,855		63,871		509
Total commercial and industrial	104,940				105,082		9,411		118,522		878
Home equity lines	6,317				6,317		180		5,664		59
Consumer mortgages	28,842				28,842		783		31,299		345
Credit cards	—				—		—		—		—
Other retail	5,167				5,167		74		5,252		84
Total retail	40,326				40,326		1,037		42,215		488
Total impaired loans with	$	342,708			346,456		29,006		364,179		2,636
allowance recorded
Total impaired loans
Investment properties	$	110,656			118,004		7,374		101,379		631
1-4 family properties	67,958				76,090		7,594		75,422		356
Land acquisition	58,553				99,692		3,590		65,307		283
Total commercial real estate	237,167				293,786		18,558		242,108		1,270
Commercial, financial and agricultural	50,981				53,802		6,556		60,644		369
Owner-occupied	79,216				81,918		2,855		81,429		509
Total commercial and industrial	130,197				135,720		9,411		142,073		878
Home equity lines	6,317				6,317		180		5,664		59
Consumer mortgages	29,837				30,907		783		32,294		345
Credit cards	—				—		—		—		—
Other retail	5,167				5,167		74		5,252		84
Total retail	41,321				42,391		1,037		43,210		488
Total impaired loans	$	408,685			471,897		29,006		427,391		2,636
Impaired Loans (including accruing TDRs)
	December 31, 2014								Year Ended December 31, 2014
(in thousands)	Recorded Investment				Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded
Investment properties	$	15,368			20,237		—		25,311		—
1-4 family properties	2,981				10,520		—		5,441		—
Land acquisition	21,504				61,843		—		29,954		—
Total commercial real estate	39,853				92,600		—		60,706		—
Commercial, financial and agricultural	7,391				11,193		—		8,984		—
Owner-occupied	17,017				19,612		—		19,548		—
Total commercial and industrial	24,408				30,805		—		28,532		—
Home equity lines	—				—		—		—		—
Consumer mortgages	995				2,065		—		1,352		—
Credit cards	—				—		—		—		—
Other retail	—				—		—		—		—
Total retail	995				2,065		—		1,352		—
Total impaired loans with no	$	65,256			125,470		—		90,590		—
related allowance recorded
With allowance recorded
Investment properties	$	81,758			83,963		5,413		129,289		3,690
1-4 family properties	80,625				81,357		11,442		94,773		2,645
Land acquisition	49,300				49,483		4,900		89,195		1,689
Total commercial real estate	211,683				214,803		21,755		313,257		8,024
Commercial, financial and agricultural	59,035				59,041		7,597		91,221		2,392
Owner-occupied	62,583				62,601		2,854		78,950		2,610
Total commercial and industrial	121,618				121,642		10,451		170,171		5,002
Home equity lines	4,848				4,848		129		3,604		1,405
Consumer mortgages	33,450				33,450		1,040		39,427		115
Credit cards	—				—		—		—		—
Other retail	5,293				5,293		101		4,997		315
Total retail	43,591				43,591		1,270		48,028		1,835
Total impaired loans with	$	376,892			380,036		33,476		531,456		14,861
allowance recorded
Total impaired loans
Investment properties	$	97,126			104,200		5,413		154,600		3,690
1-4 family properties	83,606				91,877		11,442		100,214		2,645
Land acquisition	70,804				111,326		4,900		119,149		1,689
Total commercial real estate	251,536				307,403		21,755		373,963		8,024
Commercial, financial and agricultural	66,426				70,234		7,597		100,205		2,392
Owner-occupied	79,600				82,213		2,854		98,498		2,610
Total commercial and industrial	146,026				152,447		10,451		198,703		5,002
Home equity lines	4,848				4,848		129		3,604		1,405
Consumer mortgages	34,445				35,515		1,040		40,779		115
Credit cards	—				—		—		—		—
Other retail	5,293				5,293		101		4,997		315
Total retail	44,586				45,656		1,270		49,380		1,835
Total impaired loans	$	442,148			505,506		33,476		622,046		14,861
The average recorded investment in impaired loans was $754.3 million for the three months ended March 31, 2014. Excluding accruing TDRs, there was no interest income recognized for the investment in impaired loans for the three months ended March 31, 2014. Interest income recognized for accruing TDRs was $4.0 million for the three months ended March 31, 2014 . At March 31, 2015 and December 31, 2014, all impaired loans other than $313.4 million and $348.4 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 three months ended March 31, 2015 and 2014 that were reported as accruing or non-accruing TDRs.
TDRs by Concession Type
	Three Months Ended March 31, 2015
(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate		Term Extensions and/or Other Concessions		Total
Investment properties	3			$	—		16,932		3,604		20,536
1-4 family properties	13			14,823			2,856		150		17,829
Land acquisition	3			—			255		708		963
Total commercial real estate	19			14,823			20,043		4,462		39,328
Commercial, financial and agricultural	25			—			1,015		1,890		2,905
Owner-occupied	2			—			1,739		—		1,739
Total commercial and industrial	27			—			2,754		1,890		4,644
Home equity lines	11			—			975		135		1,110
Consumer mortgages	11			—			245		786		1,031
Credit cards	—			—			—		—		—
Other retail	6			—			257		64		321
Total retail	28			—			1,477		985		2,462
Total TDRs	74			$	14,823		24,274		7,337		46,434		(1	)
(1) Net charge-offs of $4.0 million were recorded during the three months ended March 31, 2015 upon restructuring of these loans.
TDRs by Concession Type
	Three Months Ended March 31, 2014
(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate		Term Extensions and/or Other Concessions		Total
Investment properties	5			$	—		7,143		531		7,674
1-4 family properties	11			—			429		2,114		2,543
Land acquisition	1			—			—		534		534
Total commercial real estate	17			—			7,572		3,179		10,751
Commercial, financial and agricultural	21			—			1,791		4,282		6,073
Owner-occupied	7			—			2,488		2,818		5,306
Total commercial and industrial	28			—			4,279		7,100		11,379
Home equity lines	2			—			241		46		287
Consumer mortgages	1			—			101		—		101
Credit cards	—			—			—		—		—
Other retail	4			—			—		117		117
Total retail	7			—			342		163		505
Total TDRs	52			$	—		12,193		10,442		22,635		(2	)
(2) No net charge-offs were recorded during the three months ended March 31, 2014 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
	Three Months Ended						Three Months Ended March 31, 2014
	31-Mar-15
(in thousands, except contract data)	Number of			Recorded			Number of		Recorded
	Contracts			Investment			Contracts		Investment
Investment properties	—			$	—		1		$	186
1-4 family properties	—			—			—		—
Land acquisition	—			—			—		—
Total commercial real estate	—			—			1		186
Commercial, financial and agricultural	—			—			1		522
Owner-occupied	—			—			—		—
Total commercial and industrial	—			—			1		522
Home equity lines	1			34			—		—
Consumer mortgages	—			—			—		—
Credit cards	—			—			—		—
Other retail	1			81			—		—
Total retail	2			115			—		—
Total TDRs	2			$	115		2		$	708
* 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 March 31, 2015, the allowance for loan losses allocated to accruing TDRs totaling $313.4 million was $17.6 million compared to accruing TDRs of $348.4 million with an allocated allowance for loan losses of $21.0 million at December 31, 2014. 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	3 Months Ended
	Mar. 31, 2015
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Real Estate	Note 8 - Other Real Estate
	The carrying value of ORE was $74.8 million and $85.5 million at March 31, 2015 and December 31, 2014, respectively. During the three months ended March 31, 2015 and 2014, $5.4 million and $12.9 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 three months ended March 31, 2015 and 2014, Synovus recognized foreclosed real estate expense, net, of $9.5 million and $5.7 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 $7.3 million and $4.8 million for the three months ended March 31, 2015 and 2014, respectively.

Other_Comprehensive_Income_Los

Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2015
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 for the three months ended March 31, 2015 and 2014.
	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	—				11,588			—		11,588
	Amounts reclassified from accumulated other comprehensive income (loss)	69				(818	)		(44	)	(793	)
	Net current period other comprehensive income	69				10,770			(44	)	10,795
	Balance as of March 31, 2014	$	(13,030	)		(18,166	)		733		(30,463	)
	Balance as of December 31, 2014	$	(12,824	)		(713	)		932		(12,605	)
	Other comprehensive income before reclassifications	—				9,355			—		9,355
	Amounts reclassified from accumulated other comprehensive income (loss)	69				(444	)		(26	)	(401	)
	Net current period other comprehensive income	69				8,911			(26	)	8,954
	Balance as of March 31, 2015	$	(12,755	)		8,198			906		(3,651	)
	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). 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 March 31, 2015, the 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 a 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 three months ended March 31, 2015 and 2014.
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	Details About		Amount Reclassified from						Affected Line Item
	Accumulated Other Comprehensive Income (Loss) Components		Accumulated Other						in the Statement Where
			Comprehensive Income (Loss)						Net Income is Presented
			For the Three Months Ended March 31,
			2015				2014
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(112	)		(112	)	Interest expense
			43				43		Income tax (expense) benefit
			$	(69	)		(69	)	Reclassifications, net of income taxes
	Net unrealized gains (losses) on investment securities available for sale:
	Realized gain on sale of securities		$	725			1,331		Investment securities gains, net
			(281		)		(513	)	Income tax (expense) benefit
			$	444			818		Reclassifications, net of income taxes
	Post-retirement unfunded health benefit:
	Amortization of actuarial gains		$	42			72		Salaries and other personnel expense
			(16		)		(28	)	Income tax (expense) benefit
			$	26			44		Reclassifications, net of income taxes

Fair_Value_Accounting

Fair Value Accounting	3 Months Ended
	Mar. 31, 2015
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, Fair Value Measurements, and ASC 825, Financial Instruments. 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, U.S. Treasury securities, and mutual funds.
	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, collateralized mortgage obligations 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, certain equity investments, and private equity investments.
	See Note 16 "Fair Value Accounting" to the consolidated financial statements of Synovus' 2014 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 March 31, 2015 and December 31, 2014, 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. Transfers betweens levels for the period ended March 31, 2015 and December 31, 2014 were inconsequential.
		March 31, 2015
	(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	—				71			—		71
	Collateralized mortgage obligations issued by	—				3,390			—		3,390
	U.S. Government sponsored enterprises
	State and municipal securities	—				646			—		646
	All other mortgage-backed	—				6,404			—		6,404
	securities
	Other investments	179				9,312			—		9,491
	Total trading securities	$	179			19,823			—		20,002
	Mortgage loans held for sale	—				89,245			—		89,245
	Investment securities available for sale:
	U.S. Treasury securities	43,618				—			—		43,618
	U.S. Government agency securities	—				25,495			—		25,495
	Securities issued by U.S. Government sponsored enterprises	—				81,779			—		81,779
	Mortgage-backed securities issued by U.S. Government agencies	—				171,865			—		171,865
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,207,669			—		2,207,669
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				568,571			—		568,571
	State and municipal securities	—				5,108			—		5,108
	Equity securities	7,173				—			—		7,173
	Other investments(1)	2,073				15,036			1,654		18,763
	Total investment securities available for sale	$	52,864			3,075,523			1,654		3,130,041
	Private equity investments	—				1,045			27,081		28,126
	Mutual funds held in rabbi trusts	11,384				—			—		11,384
	Derivative assets:
	Interest rate contracts	—				33,183			—		33,183
	Mortgage derivatives(2)	—				2,311			—		2,311
	Total derivative assets	$	—			35,494			—		35,494
	Liabilities
	Trading account liabilities	—				1,575			—		1,575
	Derivative liabilities:
	Interest rate contracts					33,856			—		33,856
	Mortgage derivatives(2)	—				749			—		749
	Visa derivative	—				—			1,425		1,425
	Total derivative liabilities	$	—			34,605			1,425		36,030
		December 31, 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	—				145					145
	Collateralized mortgage obligations issued by U.S. Government sponsored enterprises	—				2,449			—		2,449
	State and municipal securities	—				1,976			—		1,976
	All other mortgage-backed securities	—				2,483			—		2,483
	Other investments	—				6,810			—		6,810
	Total trading securities	$	—			13,863			—		13,863
	Mortgage loans held for sale	—				63,328			—		63,328
	Investment securities available for sale:
	U.S. Treasury securities	42,826				—			—		42,826
	U.S. Government agency securities	—				27,324			—		27,324
	Securities issued by U.S. Government sponsored enterprises	—				82,042			—		82,042
	Mortgage-backed securities issued by U.S. Government agencies	—				179,816			—		179,816
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,261,681			—		2,261,681
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				417,076			—		417,076
State and municipal securities	—				5,206			—		5,206
Equity securities	6,748				—			—		6,748
Other investments(1)	2,035				15,007			1,645		18,687
Total investment securities available for sale	$	51,609			2,988,152			1,645		3,041,406
Private equity investments	—				995			27,367		28,362
Mutual funds held in rabbi trusts	11,252				—			—		11,252
Derivative assets:
Interest rate contracts	—				30,904			—		30,904
Mortgage derivatives(2)	—				1,213			—		1,213
Total derivative assets	$	—			32,117			—		32,117
Liabilities
Trading account liabilities	—				2,100			—		2,100
Salary stock units	1,206				—			—		1,206
Derivative liabilities:
Interest rate contracts	—				31,398			—		31,398
Mortgage derivatives(2)					753					753
Visa derivative	—				—			1,401		1,401
Total derivative liabilities	$	—			32,151			1,401		33,552
(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
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 Three Months Ended March 31,
(in thousands)	2015			2014
Mortgage loans held for sale	410			725
Mortgage Loans Held for Sale
(in thousands)	As of March 31, 2015				As of December 31, 2014
Fair value	$	89,245			63,328
Unpaid principal balance	86,995				61,488
Fair value less aggregate unpaid principal balance	$	2,250			1,840
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 three months ended March 31, 2015 and 2014 (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 three months of 2015 and 2014, Synovus did not have any transfers between levels in the fair value hierarchy.
	Three Months Ended March 31,
	2015									2014
(in thousands)	Investment Securities Available for Sale				Private Equity Investments			Visa Derivative		Investment Securities Available for Sale		Private Equity Investments		Visa Derivative
Beginning balance, January 1,	$	1,645			27,367			(1,401	)	2,350		27,745		(2,706	)
Total gains (losses) realized/unrealized:
Included in earnings	—				(286	)		(375	)	(88	)	(250	)	(396	)
Unrealized gains (losses) included in other comprehensive income	9				—			—		137		—		—
Purchases	—				—			—		—		—		—
Sales	—				—			—		—		—		—
Issuances	—				—			—		—		—		—
Settlements	—				—			351		—		—		577
Amortization of discount/premium	—				—			—		—		—		—
Transfers in and/or out of Level 3	—				—			—		—		—		—
Ending balance, March 31,	$	1,654			27,081			(1,425	)	2,399		27,495		(2,525	)
The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	$	—			(286	)		(375	)	(88	)	(250	)	(396	)
Assets Measured at Fair Value on a Non-recurring Basis
Certain assets are 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.
	March 31, 2015											December 31, 2014
(in thousands)	Level 1				Level 2			Level 3		Total		Level 1		Level 2		Level 3	Total
Impaired loans*	$	—			—			3,282		3,282		—		—		28,588	28,588
Other loans held for sale	—				—			—		—		—		—		3,411	3,411
Other real estate	—				—			69,331		69,331		—		—		32,046	32,046
Other assets held for sale	$	—			—			—		—		—		—		3,718	3,718
The following table presents fair value adjustments recognized for the three months ended March 31, 2015 and 2014 for the assets measured at fair value on a non-recurring basis.
	Three Months Ended March 31,
(in thousands)	2015				2014
Impaired loans*	$	1,045			2,655
Other loans held for sale	—				303
Other real estate	6,681				2,637
* 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.
March 31, 2015
(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		1,654			Discounted cash flow analysis	Credit spread embedded in discount rate	485-585 bps (535 bps)
						Discount for lack of marketability(2)	0%-10% (0%)
Private equity investments		27,081			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		1,425			Internal valuation	Estimated future cumulative deposits to the litigation escrow for settlement of the Covered Litigation, and estimated future monthly fees payable to the derivative counterparty	N/A
March 31, 2015
(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		$	3,282			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (3)	0% - 83% (34%)
							Estimated selling costs	0% - 10% (7%)
Other real estate		69,331				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (3)	0% - 42% (8%)
							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) Represents management's estimate of discount that market participants would require based on the instrument's lack of liquidity.
(3) 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.
31-Dec-14
(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		1,645			Discounted cash flow analysis	Credit spread embedded in discount rate	600-675 bps (639 bps)
						Discount for lack of marketability(2)	0%-10% (0%)
Private equity investments		27,367			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(2)	N/A
Visa derivative liability		1,401			Internal valuation	Estimated future cumulative deposits to the litigation escrow for settlement of the Covered Litigation, and estimated future monthly fees payable to the derivative counterparty	N/A
31-Dec-14
(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		$	28,588			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-100% (46%)
							Estimated selling costs	0%-10% (7%)
Other loans held for sale		3,411				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-11% (7%)
							Estimated selling costs	0%-10% (7%)
Other real estate		32,046				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-61% (16%)
							Estimated selling costs	0%-10% (7%)
Other assets held for sale		3,718				Third party appraised value of collateral less estimated selling costs or BOV	Discount to appraised value (2)	0%-100% (49%)
							Estimated selling costs	0%-10% (7%)
(1) The range represents management's best estimate of the high and low end 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) Represents management's estimate of discount that market participants would require based on the instrument's lack of liquidity.
(3) 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, pending sales, and other factors.
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
The significant unobservable inputs used in the fair value measurement of the corporate obligations in Level 3 assets are the credit spread embedded in the discount rate and the discount for lack of liquidity. Generally, a change in one or more assumptions, and the degree or sensitivity of the change used, can have a significant impact on fair value. With regard to 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 changes in any of these inputs in isolation could result in a significantly higher (lower) valuation of the Visa derivative liability. Also, additional funding into the escrow generally results in a proportional increase in our derivative liability.
Fair Value of Financial Instruments
The following table presents the carrying and fair values of financial instruments at March 31, 2015 and December 31, 2014. 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 fair value amounts should not be taken as an estimate of the amount that would be realized if all such financial instruments were to be settled immediately.
The carrying and estimated fair values of financial instruments, as well as the level within the fair value hierarchy, as of March 31, 2015 and December 31, 2014 are as follows:
	March 31, 2015
(in thousands)	Carrying Value				Fair Value			Level 1		Level 2		Level 3
Financial assets
Cash and cash equivalents	$	429,338			429,338			429,338		—		—
Interest bearing funds with Federal Reserve Bank	1,263,886				1,263,886			1,263,886		—		—
Interest earning deposits with banks	6,871				6,871			6,871		—		—
Federal funds sold and securities purchased under resale agreements	80,772				80,772			80,772		—		—
Trading account assets	20,002				20,002			179		19,823		—
Mortgage loans held for sale	89,245				89,245			—		89,245		—
Other loans held for sale	1,082				1,082			—		—		1,082
Investment securities available for sale	3,130,041				3,130,041			52,864		3,075,523		1,654
Private equity investments	28,126				28,126			—		1,045		27,081
Mutual funds held in rabbi trusts	11,384				11,384			11,384		—		—
Loans, net of deferred fees and costs	21,106,213				20,877,101			—		—		20,877,101
Derivative assets	35,494				35,494			—		35,494		—
Financial liabilities
Trading account liabilities	1,575				1,575			—		1,575		—
Non-interest bearing deposits	6,251,393				6,251,393			—		6,251,393		—
Interest bearing deposits	15,856,456				15,848,697			—		15,848,697		—
Federal funds purchased and securities sold under repurchase agreements	125,323				125,323			125,323		—		—
Long-term debt	2,189,769				2,243,405			—		2,243,405		—
Derivative liabilities	$	36,030			36,030			—		34,605		1,425
	December 31, 2014
(in thousands)	Carrying Value				Fair Value			Level 1		Level 2		Level 3
Financial assets
Cash and cash equivalents	$	485,489			485,489			485,489		—		—
Interest bearing funds with Federal Reserve Bank	721,362				721,362			721,362		—		—
Interest earning deposits with banks	11,810				11,810			11,810		—		—
Federal funds sold and securities purchased under resale agreements	73,111				73,111			73,111		—		—
Trading account assets	13,863				13,863			—		13,863		—
Mortgage loans held for sale	63,328				63,328			—		63,328		—
Other loans held for sale	3,606				3,606			—		—		3,606
Investment securities available for sale	3,041,406				3,041,406			51,609		2,988,152		1,645
Private equity investments	28,362				28,362			—		995		27,367
Mutual funds held in rabbi trusts	11,252				11,252			11,252		—		—
Loans, net of deferred fees and costs	21,097,699				20,872,939			—		—		20,872,939
Derivative assets	32,117				32,117			—		32,117		—
Financial liabilities
Trading account liabilities	2,100				2,100			—		2,100		—
Non-interest bearing deposits	6,228,472				6,228,472			—		6,228,472		—
Interest bearing deposits	15,303,228				15,299,372			—		15,299,372		—
Federal funds purchased and securities sold under repurchase agreements	126,916				126,916			126,916		—		—
Salary stock units	1,206				1,206			1,206		—		—
Long-term debt	2,140,319				2,191,279			—		2,191,279		—
Derivative liabilities	$	33,553			33,553			—		32,151		1,401

Derivative_Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014, 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 March 31, 2015, 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 is recorded.
	Synovus did not terminate any cash flow hedges during 2015 or 2014. The remaining unamortized deferred net loss balance of all previously terminated cash flow hedges at March 31, 2015 and December 31, 2014 was $(1.0) million and $(1.1) 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 March 31, 2015, there were no fair value hedges outstanding, and therefore, no cumulative ineffectiveness.
	Synovus did not terminate any fair value hedges during 2015 or 2014. The remaining unamortized deferred gain balance on all previously terminated fair value hedges at March 31, 2015 and December 31, 2014 was $6.8 million and $7.6 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 March 31, 2015, the notional amount of customer related interest rate derivative financial instruments, including both the customer position and the offsetting position, was $1.11 billion, an increase of $20.6 million compared to December 31, 2014.
	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 $1.4 million at March 31, 2015 and December 31, 2014, 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. 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 interest rate lock commitments for residential mortgage loans which commits it 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 March 31, 2015 and December 31, 2014, Synovus had commitments to fund at a locked interest rate, primarily fixed-rate mortgage loans to customers in the amount of $125.5 million and $73.4 million, respectively. The fair value of these commitments resulted in a gain of $1.1 million and $649 thousand for the three months ended March 31, 2015 and 2014, respectively, which was recorded as a component of mortgage banking income in the consolidated statements of income.
	At March 31, 2015 and December 31, 2014, outstanding commitments to sell primarily fixed-rate mortgage loans amounted to $170.5 million and $113.0 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 gain of $5 thousand and a loss of $(969) thousand for the three months ended March 31, 2015 and 2014, respectively, 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 March 31, 2015, collateral totaling $67.5 million consisting of Federal funds sold was pledged to the derivative counterparties, including $7.6 million with the CCC, to comply with collateral requirements.
	The impact of derivative instruments on the consolidated balance sheets at March 31, 2015 and December 31, 2014 is presented below.
		Fair Value of Derivative Assets						Fair Value of Derivative Liabilities
	(in thousands)	Location on Consolidated Balance Sheet	March 31, 2015			December 31, 2014		Location on Consolidated Balance Sheet	March 31, 2015		December 31, 2014
	Derivatives not designated
	as hedging instruments:
	Interest rate contracts	Other assets	$	33,183		30,904		Other liabilities	$	33,856	31,398
	Mortgage derivatives	Other assets	2,311			1,213		Other liabilities	749		753
	Visa derivative		—			—		Other liabilities	1,425		1,401
	Total derivatives not		$	35,494		32,117			$	36,030	33,552
	designated as hedging
	instruments
	The pre-tax effect of fair value hedges on the consolidated statements of income for the three months ended March 31, 2015 and 2014 is presented below.
		Location of Gain (Loss) Recognized in Income	Gain (Loss) Recognized in Income
	(in thousands)		Three Months Ended March 31,
	Derivatives not designated as hedging instruments		2015			2014
	Interest rate contracts(1)	Other non-interest income	$	(179	)	104
	Mortgage derivatives(2)	Mortgage banking income	1,102			(320	)
	Total		$	923		(216	)
	(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 three months ended March 31, 2015 and 2014, Synovus reclassified $774 thousand and $914 thousand, 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	3 Months Ended
	Mar. 31, 2015
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 three months ended March 31, 2015 and 2014.
		Three Months Ended March 31,
	(in thousands, except per share data)	2015		2014
	Basic Net Income Per Common Share:
	Net income available to common shareholders	$	51,404	45,857
	Weighted average common shares outstanding	134,933		138,932
	Net income per common share, basic	0.38		0.33
	Diluted Net Income Per Common Share:
	Net income available to common shareholders	51,404		45,857
	Weighted average common shares outstanding	134,933		138,932
	Potentially dilutive shares from assumed exercise of	811		572
	securities or other contracts to purchase common stock
	Weighted average diluted common shares	135,744		139,504
	Net income per common share, diluted	0.38		0.33
	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 for prior periods included in this Report 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.
	As of March 31, 2015 and 2014, there were 3.1 million and 3.5 million, respectively, potentially dilutive shares related to common stock options and Warrants to purchase shares of common stock that were outstanding during 2015 and 2014, 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	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015, Synovus had a total of 6,696,079 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, and performance share units) count as two 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, restricted share units, market restricted share units, and performance share units. The grants generally include vesting periods ranging from three to five years and contractual terms of ten 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, market restricted share units, and performance 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. Total share-based compensation expense was $3.2 million for the three months ended March 31, 2015 and $2.2 million for the three months ended March 31, 2014.
	Stock Options
	No stock option grants were made during the three months ended March 31, 2015. At March 31, 2015, there were 2,361,598 outstanding options to purchase shares of common stock with a weighted average exercise price of $45.13.
	Restricted Share Units, Performance Share Units, and Market Restricted Share Units
	During the three months ended March 31, 2015, Synovus awarded 291,754 restricted share units that have a service-based vesting period of three years and awarded 82,152 performance share units that vest upon service conditions and performance conditions. Synovus also granted 82,152 market restricted share units during the three months ended March 31, 2015. The weighted average grant-date fair value of the awarded restricted share units, performance share units and market restricted share units was $28.30 per share. Market restricted share units and performance share units are granted at target and are compared annually to required market and performance metrics. The performance share units vest upon meeting certain service and performance conditions. Return on average assets (ROAA) performance will be evaluated each year over a three-year performance period, with share distribution determined at the end of the three years. The number of performance share units that will ultimately vest ranges from 0% to 150% of target based on Synovus' three-year weighted average ROAA (as defined). The market restricted share units have a three-year service-based vesting component as well as a total shareholder return multiplier. The number of market restricted share units that will ultimately vest ranges from 75% to 125% of target based on Synovus' total shareholder return (TSR). At March 31, 2015, including dividend equivalents granted, there were 1,099,065 restricted share units, performance share units and market restricted share units outstanding with a weighted average grant-date fair value of $24.80.

Legal_Proceedings

Legal Proceedings	3 Months Ended
	Mar. 31, 2015
Legal Proceedings Disclosure [Abstract]
Legal Proceedings	Note 14 - 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 such 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 March 31, 2015 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 more than slight but less than reasonably possible." 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.
	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. 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. Plaintiffs amended their complaint on October 21, 2011. The Synovus entities filed a motion to dismiss the amended complaint on November 22, 2011. On July 26, 2012, the court denied the motion as to Synovus and Synovus Bank, but granted the motion as to CB&T. Synovus and Synovus Bank filed their answer to the amended complaint on September 24, 2012.
	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. The District Court granted final approval of the Posting Order Settlement Payment on April 2, 2015.
	TelexFree Litigation
	On October 22, 2014, several pending lawsuits were consolidated into a multi-district putative class action case captioned In re: TelexFree Securities Litigation, MDL Number 4:14-md2566-TSH, United States District Court District of Massachusteets. Synovus Financial Corp. and Synovus Bank were named as defendants with numerous other defendants in the purported class action lawsuit.   An Amended Complaint was filed on March 31, 2015 which consolidated and amended the claims previously asserted. The claims against Synovus Financial Corp. were dismissed by Plaintiffs on April 10, 2015 so now, as to Synovus- related entities, only claims against Synovus Bank remain pending.   TelexFree was a merchant customer of Base Commerce, LLC “Base Commerce”, an independent sales organization/member service provider sponsored by Synovus Bank. The purported class action lawsuit generally alleges that TelexFree engaged in an improper multi-tier marketing scheme involving voice-over Internet protocol telephone services and that the various defendants, including Synovus Bank, provided financial services to TelexFree that allowed TelexFree to conduct its business operations.
	Synovus Bank believes it has substantial defenses related to these purported claims and intends to vigorously defend the claims asserted. Synovus currently cannot reasonably estimate losses attributable to this matter.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Significant Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents consist of cash and due from banks. At March 31, 2015 and December 31, 2014, $125 thousand 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. At March 31, 2015 and December 31, 2014, interest bearing funds with the Federal Reserve Bank included $81.5 million and $89.7 million, respectively, on deposit to meet Federal Reserve Bank requirements. Interest earning deposits with banks include $7.0 million and $7.1 million at March 31, 2015 and December 31, 2014, respectively, which is pledged as collateral in connection with certain letters of credit. Federal funds sold include $67.5 million at March 31, 2015 and December 31, 2014, 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	During 2014, the FASB issued the following ASUs, all of which became effective January 1, 2015:
	•	ASU 2014-01, Investments-Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued amended guidance which permits Synovus to make an accounting policy election to account for its investments in qualified affordable housing projects using a proportional amortization method, if certain conditions are met, and to present the amortization as a component of income tax expense. The amended guidance would be applied retrospectively to all periods presented and is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. Regardless of the policy election, the amended guidance, where disclosed, enables the users of the financial statements to understand the nature of investments in qualified affordable housing projects and the effect of the measurement of the investments in qualified affordable housing projects and the related tax credits on Synovus’ financial position and results of operations.
	Synovus adopted the amended guidance on January 1, 2015, and did not make an accounting policy election to apply the proportional amortization method for its investments in qualified affordable housing projects because the impact to the consolidated financial statements was insignificant. Therefore, the adoption did not have an impact on Synovus’ consolidated financial statements. At March 31, 2015, the aggregate carrying value of Synovus' investments in LIHTC partnerships was $8.7 million. See Note 18 "Variable Interest Entities" to the consolidated financial statements of Synovus' 2014 Form 10-K for additional information regarding these investments.
	Additionally, adoption of the following standards effective January 1, 2015 did not have a significant impact on Synovus’ consolidated financial statements.
	•	ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure
	•	ASU 2014-12, Accounting for Share-Based Payments when the Terms of an Award Provide that a Performance Target Could be Achieved after the Requisite Service Period
	•	ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures
	•	ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity
	•	ASU 2014-04, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40), Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
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)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014 are summarized below.
			March 31, 2015
	(in thousands)		Amortized Cost(1)			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	43,139		479			—			43,618
	U.S. Government agency securities		24,515			980			—			25,495
	Securities issued by U.S. Government sponsored enterprises		81,115			664			—			81,779
	Mortgage-backed securities issued by U.S. Government agencies		169,098			3,112			(345	)		171,865
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,186,379			27,536			(6,246	)		2,207,669
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		563,513			6,086			(1,028	)		568,571
	State and municipal securities		4,941			168			(1	)		5,108
	Equity securities		3,228			3,945			—			7,173
	Other investments		19,132			37			(406	)		18,763
	Total investment securities available for sale		$	3,095,060		43,007			(8,026	)		3,130,041
			December 31, 2014
	(in thousands)		Amortized Cost(1)			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury securities		$	42,636		190			—			42,826
	U.S. Government agency securities		26,426			898			—			27,324
	Securities issued by U.S. Government sponsored enterprises		81,332			710			—			82,042
	Mortgage-backed securities issued by U.S. Government agencies		177,678			2,578			(440	)		179,816
	Mortgage-backed securities issued by U.S. Government sponsored enterprises		2,250,897			19,915			(9,131	)		2,261,681
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises		414,562			4,856			(2,342	)		417,076
	State and municipal securities		5,024			183			(1	)		5,206
	Equity securities		3,228			3,520						6,748
	Other investments		19,121			7			(441	)		18,687
	Total investment securities available for sale		$	3,020,904		32,857			(12,355	)		3,041,406
	(1)	Amortized cost is adjusted for other-than-temporary impairment charges in 2014, which have been recognized in the consolidated statements of income 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 March 31, 2015 and December 31, 2014, are presented below.
		March 31, 2015
		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
	Mortgage-backed securities issued by U.S. Government agencies	4,473			11			20,678			334		25,151	345
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—			—			732,387			6,246		732,387	6,246
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—			—			82,318			1,028		82,318	1,028
	State and municipal securities	—			—			46			1		46	1
	Other investments	—			—			3,726			406		3,726	406
	Total	$	4,473		11			839,155			8,015		843,628	8,026
		31-Dec-14
		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
	Mortgage-backed securities issued by U.S. Government agencies	—			—			21,488			440		21,488	440
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	251,134			763			798,282			8,368		1,049,416	9,131
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	20,338			61			119,172			2,281		139,510	2,342
	State and municipal securities	—			—			45			1		45	1
	Other investments	—			—			3,680			441		3,680	441
	Total	$	271,472		824			942,667			11,531		1,214,139	12,355
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 March 31, 2015
	(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	$	18,286		24,853			—			—		—	43,139
	U.S. Government agency securities	78			12,001			12,436			—		—	24,515
	Securities issued by U.S. Government sponsored enterprises	—			81,115			—			—		—	81,115
	Mortgage-backed securities issued by U.S. Government agencies	—			—			—			169,098		—	169,098
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	134			1,201			1,792,674			392,370		—	2,186,379
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—			—			—			563,513		—	563,513
	State and municipal securities	165			2,067			—			2,709		—	4,941
	Equity securities	—			—			—			—		3,228	3,228
	Other investments	—			—			15,000			2,000		2,132	19,132
	Total amortized cost	$	18,663		121,237			1,820,110			1,129,690		5,360	3,095,060
	Fair Value
	U.S. Treasury securities	$	18,286		25,332			—			—		—	43,618
	U.S. Government agency securities	80			12,412			13,003			—		—	25,495
	Securities issued by U.S. Government sponsored enterprises	—			81,779			—			—		—	81,779
	Mortgage-backed securities issued by U.S. Government agencies	—			—			—			171,865		—	171,865
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	140			1,271			1,801,124			405,134		—	2,207,669
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—			—			—			568,571		—	568,571
	State and municipal securities	166			2,106			—			2,836		—	5,108
	Equity securities	—			—			—			—		7,173	7,173
	Other investments	—			—			15,037			1,653		2,073	18,763
	Total fair value	$	18,672		122,900			1,829,164			1,150,059		9,246	3,130,041
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 three months ended March 31, 2015 and 2014 are presented below. Other-than-temporary impairment charges of $88 thousand are included in gross realized losses for the three months ended March 31, 2014. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale.
			Three Months Ended March 31,
	(in thousands)		2015			2014
	Proceeds from sales of investment securities available for sale		$	32,419		20,815
	Gross realized gains		725			1,419
	Gross realized losses		—			(88	)
	Investment securities gains, net		$	725		1,331

Restructuring_Charges_Tables

Restructuring Charges (Tables)	3 Months Ended
	Mar. 31, 2015
Restructuring Charges [Abstract]
Schedule of Restructuring and Related Costs	For the three months ended March 31, 2015 and 2014 total restructuring charges consist of the following components:
		Three Months Ended March 31,
	(in thousands)	2015			2014
	Severance charges	$	—		8,047
	Gain on sale of assets held for sale, net	(157		)	—
	Professional fees and other charges	50			530
	Total restructuring charges, net	$	(107	)	8,577
	The following table presents aggregate activity associated with accruals that resulted from restructuring charges during the three months ended March 31, 2015 and 2014:
		Severance Charges			Lease Termination Charges		Total
	(in thousands)
	Balance at December 31, 2013	$	1,572		1,383		2,955
	Accruals for efficiency initiatives	8,047			—		8,047
	Payments	(1,931		)	(1,289	)	(3,220	)
	Balance at March 31, 2014	7,688			94		7,782
	Balance at December 31, 2014	3,291			5,539		8,830
	Payments	(521		)	(221	)	(742	)
	Balance at March 31, 2015	$	2,770		5,318		8,088

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014.
	Current, Accruing Past Due, and Non-accrual Loans
		March 31, 2015
	(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	$	5,201,493			2,579		211		2,790		19,780			5,224,063
	1-4 family properties	1,096,543				3,954		291		4,245		22,827			1,123,615
	Land acquisition	526,185				1,704		4		1,708		31,444			559,337
	Total commercial real estate	6,824,221				8,237		506		8,743		74,051			6,907,015
	Commercial, financial and agricultural	6,155,867				17,834		2,410		20,244		42,060			6,218,171
	Owner-occupied	4,050,333				7,704		—		7,704		31,626			4,089,663
	Total commercial and industrial	10,206,200				25,538		2,410		27,948		73,686			10,307,834
	Home equity lines	1,647,045				5,301		759		6,060		18,933			1,672,038
	Consumer mortgages	1,667,761				9,276		—		9,276		25,351			1,702,388
	Credit cards	239,150				1,767		1,340		3,107		—			242,257
	Other retail	299,529				2,299		10		2,309		2,211			304,049
	Total retail	3,853,485				18,643		2,109		20,752		46,495			3,920,732
	Total loans	$	20,883,906			52,418		5,025		57,443		194,232			21,135,581	(1	)
		December 31, 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	$	5,187,200			1,851		—		1,851		20,720			5,209,771
	1-4 family properties	1,106,111				4,067		432		4,499		24,197			1,134,807
	Land acquisition	540,932				363		—		363		34,375			575,670
	Total commercial real estate	6,834,243				6,281		432		6,713		79,292			6,920,248
	Commercial, financial and agricultural	6,172,220				9,979		1,790		11,769		40,359			6,224,348
	Owner-occupied	4,016,997				6,404		225		6,629		26,099			4,049,725
	Total commercial and industrial	10,189,217				16,383		2,015		18,398		66,458			10,274,073
	Home equity lines	1,659,869				6,992		703		7,695		16,434			1,683,998
	Consumer mortgages	1,648,145				12,626		12		12,638		33,278			1,694,061
	Credit cards	250,304				1,971		1,374		3,345		—			253,649
	Other retail	297,703				2,361		101		2,462		2,295			302,460
	Total retail	3,856,021				23,950		2,190		26,140		52,007			3,934,168
	Total loans	$	20,879,481			46,614		4,637		51,251		197,757			21,128,489	(2	)
	(1)Total before net deferred fees and costs of $29.4 million.
	(2)Total before net deferred fees and costs of $30.8 million.
Loan Portfolio Credit Exposure	In the following tables, retail 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
		March 31, 2015
	(in thousands)	Pass				Special		Substandard(1)		Doubtful(2)		Loss			Total
						Mention
	Investment properties	$	4,959,969			156,878		107,216		—		—			5,224,063
	1-4 family properties	956,789				74,830		84,726		7,270		—			1,123,615
	Land acquisition	456,175				47,259		55,318		585		—			559,337
	Total commercial real estate	6,372,933				278,967		247,260		7,855		—			6,907,015
	Commercial, financial and agricultural	5,956,395				136,454		115,881		9,363		78		(3)	6,218,171
	Owner-occupied	3,848,237				84,320		156,334		327		445		(3)	4,089,663
	Total commercial and industrial	9,804,632				220,774		272,215		9,690		523			10,307,834
	Home equity lines	1,644,215				—		24,001		1,793		2,029		(3)	1,672,038
	Consumer mortgages	1,669,848				—		30,358		2,056		126		(3)	1,702,388
	Credit cards	240,917				—		455		—		885		(4)	242,257
	Other retail	300,846				—		3,079		32		92		(3)	304,049
	Total retail	3,855,826				—		57,893		3,881		3,132			3,920,732
	Total loans	$	20,033,391			499,741		577,368		21,426		3,655			21,135,581	(5	)
		31-Dec-14
	(in thousands)	Pass				Special		Substandard(1)		Doubtful(2)		Loss			Total
						Mention
	Investment properties	$	4,932,440			174,466		102,865		—		—			5,209,771
	1-4 family properties	944,646				86,072		96,392		7,697		—			1,134,807
	Land acquisition	460,813				52,026		62,101		730		—			575,670
	Total commercial real estate	6,337,899				312,564		261,358		8,427		—			6,920,248
	Commercial, financial and agricultural	5,945,725				145,779		123,225		9,539		80		(3)	6,224,348
	Owner-occupied	3,792,261				95,647		161,045		327		445		(3)	4,049,725
	Total commercial and industrial	9,737,986				241,426		284,270		9,866		525			10,274,073
	Home equity lines	1,659,794				—		20,043		2,009		2,152		(3)	1,683,998
	Consumer mortgages	1,653,491				—		37,656		2,654		260		(3)	1,694,061
	Credit cards	252,275				—		495		—		879		(4)	253,649
	Other retail	298,991				—		3,339		32		98		(3)	302,460
	Total retail	3,864,551				—		61,533		4,695		3,389			3,934,168
	Total loans	$	19,940,436			553,990		607,161		22,988		3,914			21,128,489	(6	)
	(1) Includes $170.5 million and $170.9 million of non-accrual Substandard loans at March 31, 2015 and December 31, 2014, 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 $29.4 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 three months ended March 31, 2015 and 2014.
	Allowance for Loan Losses and Recorded Investment in Loans
		As Of and For The Three Months Ended March 31, 2015
	(in thousands)	Commercial Real Estate				Commercial & Industrial		Retail		Unallocated		Total
	Allowance for loan losses:
	Beginning balance	$	101,471			118,110		41,736		—		261,317
	Charge-offs	(7,440		)		(5,272	)	(7,912	)	—		(20,624	)
	Recoveries	3,941				2,266		2,074		—		8,281
	Provision for loan losses	(3,764		)		2,702		5,459		—		4,397
	Ending balance	$	94,208			117,806		41,357		—		253,371
	Ending balance: individually evaluated for impairment	18,558				9,411		1,037		—		29,006
	Ending balance: collectively evaluated for impairment	$	75,650			108,395		40,320		—		224,365
	Loans:
	Ending balance: total loans(1)	$	6,907,015			10,307,834		3,920,732		—		21,135,581
	Ending balance: individually evaluated for impairment	237,167				130,197		41,321		—		408,685
	Ending balance: collectively evaluated for impairment	$	6,669,848			10,177,637		3,879,411		—		20,726,896
		As Of and For The Three Months Ended March 31, 2014
	(in thousands)	Commercial Real Estate				Commercial & Industrial		Retail		Unallocated		Total
	Allowance for loan losses:
	Beginning balance	$	127,012			116,069		41,479		23,000		307,560
	Allowance for loan losses of sold loans	(281		)		(398	)	(340	)	—		(1,019	)
	Charge-offs	(7,946		)		(8,036	)	(6,293	)	—		(22,275	)
	Recoveries	2,227				1,953		2,914		—		7,094
	Provision for loan losses	5,943				18,758		7,810		(23,000	)	9,511
	Ending balance	$	126,955			128,346		45,570		—		300,871
	Ending balance: individually evaluated for impairment	42,894				20,678		1,595		—		65,167
	Ending balance: collectively evaluated for impairment	$	84,061			107,668		43,975		—		235,704
	Loans:
	Ending balance: total loans(2)	$	6,587,254			9,961,281		3,638,905		—		20,187,440
	Ending balance: individually evaluated for impairment	481,684				220,376		52,243		—		754,303
	Ending balance: collectively evaluated for impairment	$	6,105,570			9,740,905		3,586,662		—		19,433,137
	(1)Total before net deferred fees and costs of $29.4 million.
	(2)Total before net deferred fees and costs of $28.4 million.
Schedule of Impaired Loans	he tables below summarize impaired loans (including accruing TDRs) as of March 31, 2015 and December 31, 2014.
	Impaired Loans (including accruing TDRs)
		March 31, 2015								Three Months Ended March 31, 2015
	(in thousands)	Recorded Investment				Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	With no related allowance recorded
	Investment properties	$	14,636			19,382		—		14,964		—
	1-4 family properties	2,730				10,080		—		2,888		—
	Land acquisition	22,359				63,276		—		20,814		—
	Total commercial real estate	39,725				92,738		—		38,666		—
	Commercial, financial and agricultural	6,504				9,187		—		5,993		—
	Owner-occupied	18,753				21,451		—		17,558		—
	Total commercial and industrial	25,257				30,638		—		23,551		—
	Home equity lines	—				—		—		—		—
	Consumer mortgages	995				2,065		—		995		—
	Credit cards	—				—		—		—		—
	Other retail	—				—		—		—		—
	Total retail	995				2,065		—		995		—
	Total impaired loans with no	$	65,977			125,441		—		63,212		—
	related allowance recorded
	With allowance recorded
	Investment properties	96,020				98,622		7,374		86,415		631
	1-4 family properties	65,228				66,010		7,594		72,534		356
	Land acquisition	36,194				36,416		3,590		44,493		283
	Total commercial real estate	197,442				201,048		18,558		203,442		1,270
	Commercial, financial and agricultural	44,477				44,615		6,556		54,651		369
	Owner-occupied	60,463				60,467		2,855		63,871		509
	Total commercial and industrial	104,940				105,082		9,411		118,522		878
	Home equity lines	6,317				6,317		180		5,664		59
	Consumer mortgages	28,842				28,842		783		31,299		345
	Credit cards	—				—		—		—		—
	Other retail	5,167				5,167		74		5,252		84
	Total retail	40,326				40,326		1,037		42,215		488
	Total impaired loans with	$	342,708			346,456		29,006		364,179		2,636
	allowance recorded
	Total impaired loans
	Investment properties	$	110,656			118,004		7,374		101,379		631
	1-4 family properties	67,958				76,090		7,594		75,422		356
	Land acquisition	58,553				99,692		3,590		65,307		283
	Total commercial real estate	237,167				293,786		18,558		242,108		1,270
	Commercial, financial and agricultural	50,981				53,802		6,556		60,644		369
	Owner-occupied	79,216				81,918		2,855		81,429		509
	Total commercial and industrial	130,197				135,720		9,411		142,073		878
	Home equity lines	6,317				6,317		180		5,664		59
	Consumer mortgages	29,837				30,907		783		32,294		345
	Credit cards	—				—		—		—		—
	Other retail	5,167				5,167		74		5,252		84
	Total retail	41,321				42,391		1,037		43,210		488
	Total impaired loans	$	408,685			471,897		29,006		427,391		2,636
	Impaired Loans (including accruing TDRs)
		December 31, 2014								Year Ended December 31, 2014
	(in thousands)	Recorded Investment				Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	With no related allowance recorded
	Investment properties	$	15,368			20,237		—		25,311		—
	1-4 family properties	2,981				10,520		—		5,441		—
	Land acquisition	21,504				61,843		—		29,954		—
	Total commercial real estate	39,853				92,600		—		60,706		—
	Commercial, financial and agricultural	7,391				11,193		—		8,984		—
	Owner-occupied	17,017				19,612		—		19,548		—
	Total commercial and industrial	24,408				30,805		—		28,532		—
	Home equity lines	—				—		—		—		—
	Consumer mortgages	995				2,065		—		1,352		—
	Credit cards	—				—		—		—		—
	Other retail	—				—		—		—		—
	Total retail	995				2,065		—		1,352		—
Total impaired loans with no	$	65,256			125,470		—		90,590		—
related allowance recorded
With allowance recorded
Investment properties	$	81,758			83,963		5,413		129,289		3,690
1-4 family properties	80,625				81,357		11,442		94,773		2,645
Land acquisition	49,300				49,483		4,900		89,195		1,689
Total commercial real estate	211,683				214,803		21,755		313,257		8,024
Commercial, financial and agricultural	59,035				59,041		7,597		91,221		2,392
Owner-occupied	62,583				62,601		2,854		78,950		2,610
Total commercial and industrial	121,618				121,642		10,451		170,171		5,002
Home equity lines	4,848				4,848		129		3,604		1,405
Consumer mortgages	33,450				33,450		1,040		39,427		115
Credit cards	—				—		—		—		—
Other retail	5,293				5,293		101		4,997		315
Total retail	43,591				43,591		1,270		48,028		1,835
Total impaired loans with	$	376,892			380,036		33,476		531,456		14,861
allowance recorded
Total impaired loans
Investment properties	$	97,126			104,200		5,413		154,600		3,690
1-4 family properties	83,606				91,877		11,442		100,214		2,645
Land acquisition	70,804				111,326		4,900		119,149		1,689
Total commercial real estate	251,536				307,403		21,755		373,963		8,024
Commercial, financial and agricultural	66,426				70,234		7,597		100,205		2,392
Owner-occupied	79,600				82,213		2,854		98,498		2,610
Total commercial and industrial	146,026				152,447		10,451		198,703		5,002
Home equity lines	4,848				4,848		129		3,604		1,405
Consumer mortgages	34,445				35,515		1,040		40,779		115
Credit cards	—				—		—		—		—
Other retail	5,293				5,293		101		4,997		315
Total retail	44,586				45,656		1,270		49,380		1,835
Total impaired loans	$	442,148			505,506		33,476		622,046		14,861
Troubled Debt Restructurings	The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the three months ended March 31, 2015 and 2014 that were reported as accruing or non-accruing TDRs.
	TDRs by Concession Type
		Three Months Ended March 31, 2015
	(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate		Term Extensions and/or Other Concessions		Total
	Investment properties	3			$	—		16,932		3,604		20,536
	1-4 family properties	13			14,823			2,856		150		17,829
	Land acquisition	3			—			255		708		963
	Total commercial real estate	19			14,823			20,043		4,462		39,328
	Commercial, financial and agricultural	25			—			1,015		1,890		2,905
	Owner-occupied	2			—			1,739		—		1,739
	Total commercial and industrial	27			—			2,754		1,890		4,644
	Home equity lines	11			—			975		135		1,110
	Consumer mortgages	11			—			245		786		1,031
	Credit cards	—			—			—		—		—
	Other retail	6			—			257		64		321
	Total retail	28			—			1,477		985		2,462
	Total TDRs	74			$	14,823		24,274		7,337		46,434		(1	)
	(1) Net charge-offs of $4.0 million were recorded during the three months ended March 31, 2015 upon restructuring of these loans.
	TDRs by Concession Type
		Three Months Ended March 31, 2014
	(in thousands, except contract data)	Number of Contracts			Principal Forgiveness			Below Market Interest Rate		Term Extensions and/or Other Concessions		Total
	Investment properties	5			$	—		7,143		531		7,674
	1-4 family properties	11			—			429		2,114		2,543
	Land acquisition	1			—			—		534		534
	Total commercial real estate	17			—			7,572		3,179		10,751
	Commercial, financial and agricultural	21			—			1,791		4,282		6,073
	Owner-occupied	7			—			2,488		2,818		5,306
	Total commercial and industrial	28			—			4,279		7,100		11,379
	Home equity lines	2			—			241		46		287
	Consumer mortgages	1			—			101		—		101
	Credit cards	—			—			—		—		—
	Other retail	4			—			—		117		117
	Total retail	7			—			342		163		505
	Total TDRs	52			$	—		12,193		10,442		22,635		(2	)
	(2) No net charge-offs were recorded during the three months ended March 31, 2014 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
		Three Months Ended						Three Months Ended March 31, 2014
		31-Mar-15
	(in thousands, except contract data)	Number of			Recorded			Number of		Recorded
		Contracts			Investment			Contracts		Investment
	Investment properties	—			$	—		1		$	186
	1-4 family properties	—			—			—		—
	Land acquisition	—			—			—		—
	Total commercial real estate	—			—			1		186
	Commercial, financial and agricultural	—			—			1		522
	Owner-occupied	—			—			—		—
	Total commercial and industrial	—			—			1		522
	Home equity lines	1			34			—		—
	Consumer mortgages	—			—			—		—
	Credit cards	—			—			—		—
	Other retail	1			81			—		—
	Total retail	2			115			—		—
	Total TDRs	2			$	115		2		$	708
	* 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)	3 Months Ended
	Mar. 31, 2015
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 for the three months ended March 31, 2015 and 2014.
	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	—				11,588			—		11,588
	Amounts reclassified from accumulated other comprehensive income (loss)	69				(818	)		(44	)	(793	)
	Net current period other comprehensive income	69				10,770			(44	)	10,795
	Balance as of March 31, 2014	$	(13,030	)		(18,166	)		733		(30,463	)
	Balance as of December 31, 2014	$	(12,824	)		(713	)		932		(12,605	)
	Other comprehensive income before reclassifications	—				9,355			—		9,355
	Amounts reclassified from accumulated other comprehensive income (loss)	69				(444	)		(26	)	(401	)
	Net current period other comprehensive income	69				8,911			(26	)	8,954
	Balance as of March 31, 2015	$	(12,755	)		8,198			906		(3,651	)
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 three months ended March 31, 2015 and 2014.
	Reclassifications out of Accumulated Other Comprehensive Income (Loss)
	Details About		Amount Reclassified from						Affected Line Item
	Accumulated Other Comprehensive Income (Loss) Components		Accumulated Other						in the Statement Where
			Comprehensive Income (Loss)						Net Income is Presented
			For the Three Months Ended March 31,
			2015				2014
	Net unrealized gains (losses) on cash flow hedges:
	Amortization of deferred losses		$	(112	)		(112	)	Interest expense
			43				43		Income tax (expense) benefit
			$	(69	)		(69	)	Reclassifications, net of income taxes
	Net unrealized gains (losses) on investment securities available for sale:
	Realized gain on sale of securities		$	725			1,331		Investment securities gains, net
			(281		)		(513	)	Income tax (expense) benefit
			$	444			818		Reclassifications, net of income taxes
	Post-retirement unfunded health benefit:
	Amortization of actuarial gains		$	42			72		Salaries and other personnel expense
			(16		)		(28	)	Income tax (expense) benefit
			$	26			44		Reclassifications, net of income taxes

Fair_Value_Accounting_Tables

Fair Value Accounting (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014, 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. Transfers betweens levels for the period ended March 31, 2015 and December 31, 2014 were inconsequential.
		March 31, 2015
	(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	—				71			—		71
	Collateralized mortgage obligations issued by	—				3,390			—		3,390
	U.S. Government sponsored enterprises
	State and municipal securities	—				646			—		646
	All other mortgage-backed	—				6,404			—		6,404
	securities
	Other investments	179				9,312			—		9,491
	Total trading securities	$	179			19,823			—		20,002
	Mortgage loans held for sale	—				89,245			—		89,245
	Investment securities available for sale:
	U.S. Treasury securities	43,618				—			—		43,618
	U.S. Government agency securities	—				25,495			—		25,495
	Securities issued by U.S. Government sponsored enterprises	—				81,779			—		81,779
	Mortgage-backed securities issued by U.S. Government agencies	—				171,865			—		171,865
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,207,669			—		2,207,669
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				568,571			—		568,571
	State and municipal securities	—				5,108			—		5,108
	Equity securities	7,173				—			—		7,173
	Other investments(1)	2,073				15,036			1,654		18,763
	Total investment securities available for sale	$	52,864			3,075,523			1,654		3,130,041
	Private equity investments	—				1,045			27,081		28,126
	Mutual funds held in rabbi trusts	11,384				—			—		11,384
	Derivative assets:
	Interest rate contracts	—				33,183			—		33,183
	Mortgage derivatives(2)	—				2,311			—		2,311
	Total derivative assets	$	—			35,494			—		35,494
	Liabilities
	Trading account liabilities	—				1,575			—		1,575
	Derivative liabilities:
	Interest rate contracts					33,856			—		33,856
	Mortgage derivatives(2)	—				749			—		749
	Visa derivative	—				—			1,425		1,425
	Total derivative liabilities	$	—			34,605			1,425		36,030
		December 31, 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	—				145					145
	Collateralized mortgage obligations issued by U.S. Government sponsored enterprises	—				2,449			—		2,449
	State and municipal securities	—				1,976			—		1,976
	All other mortgage-backed securities	—				2,483			—		2,483
	Other investments	—				6,810			—		6,810
	Total trading securities	$	—			13,863			—		13,863
	Mortgage loans held for sale	—				63,328			—		63,328
	Investment securities available for sale:
	U.S. Treasury securities	42,826				—			—		42,826
	U.S. Government agency securities	—				27,324			—		27,324
	Securities issued by U.S. Government sponsored enterprises	—				82,042			—		82,042
	Mortgage-backed securities issued by U.S. Government agencies	—				179,816			—		179,816
	Mortgage-backed securities issued by U.S. Government sponsored enterprises	—				2,261,681			—		2,261,681
	Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises	—				417,076			—		417,076
	State and municipal securities	—				5,206			—		5,206
	Equity securities	6,748				—			—		6,748
	Other investments(1)	2,035				15,007			1,645		18,687
	Total investment securities available for sale	$	51,609			2,988,152			1,645		3,041,406
	Private equity investments	—				995			27,367		28,362
	Mutual funds held in rabbi trusts	11,252				—			—		11,252
	Derivative assets:
	Interest rate contracts	—				30,904			—		30,904
Mortgage derivatives(2)	—				1,213			—		1,213
Total derivative assets	$	—			32,117			—		32,117
Liabilities
Trading account liabilities	—				2,100			—		2,100
Salary stock units	1,206				—			—		1,206
Derivative liabilities:
Interest rate contracts	—				31,398			—		31,398
Mortgage derivatives(2)					753					753
Visa derivative	—				—			1,401		1,401
Total derivative liabilities	$	—			32,151			1,401		33,552
(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 Three Months Ended March 31,
	(in thousands)	2015			2014
	Mortgage loans held for sale	410			725
	Mortgage Loans Held for Sale
	(in thousands)	As of March 31, 2015				As of December 31, 2014
	Fair value	$	89,245			63,328
	Unpaid principal balance	86,995				61,488
	Fair value less aggregate unpaid principal balance	$	2,250			1,840
Changes in Level 3 Fair Value Measurements
		Three Months Ended March 31,
		2015									2014
	(in thousands)	Investment Securities Available for Sale				Private Equity Investments			Visa Derivative		Investment Securities Available for Sale		Private Equity Investments		Visa Derivative
	Beginning balance, January 1,	$	1,645			27,367			(1,401	)	2,350		27,745		(2,706	)
	Total gains (losses) realized/unrealized:
	Included in earnings	—				(286	)		(375	)	(88	)	(250	)	(396	)
	Unrealized gains (losses) included in other comprehensive income	9				—			—		137		—		—
	Purchases	—				—			—		—		—		—
	Sales	—				—			—		—		—		—
	Issuances	—				—			—		—		—		—
	Settlements	—				—			351		—		—		577
	Amortization of discount/premium	—				—			—		—		—		—
	Transfers in and/or out of Level 3	—				—			—		—		—		—
	Ending balance, March 31,	$	1,654			27,081			(1,425	)	2,399		27,495		(2,525	)
	The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	$	—			(286	)		(375	)	(88	)	(250	)	(396	)
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis
		March 31, 2015											December 31, 2014
	(in thousands)	Level 1				Level 2			Level 3		Total		Level 1		Level 2		Level 3	Total
	Impaired loans*	$	—			—			3,282		3,282		—		—		28,588	28,588
	Other loans held for sale	—				—			—		—		—		—		3,411	3,411
	Other real estate	—				—			69,331		69,331		—		—		32,046	32,046
	Other assets held for sale	$	—			—			—		—		—		—		3,718	3,718
Assets Measured at Fair Value on a Nonrecurring Basis	The following table presents fair value adjustments recognized for the three months ended March 31, 2015 and 2014 for the assets measured at fair value on a non-recurring basis.
		Three Months Ended March 31,
	(in thousands)	2015				2014
	Impaired loans*	$	1,045			2,655
	Other loans held for sale	—				303
	Other real estate	6,681				2,637
	* Impaired loans that are collateral-dependent.
Fair Value Inputs, Assets, Quantitative Information
	March 31, 2015
	(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		1,654			Discounted cash flow analysis	Credit spread embedded in discount rate	485-585 bps (535 bps)
							Discount for lack of marketability(2)	0%-10% (0%)
	Private equity investments		27,081			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		1,425			Internal valuation	Estimated future cumulative deposits to the litigation escrow for settlement of the Covered Litigation, and estimated future monthly fees payable to the derivative counterparty	N/A
	March 31, 2015
	(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		$	3,282			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (3)	0% - 83% (34%)
								Estimated selling costs	0% - 10% (7%)
	Other real estate		69,331				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (3)	0% - 42% (8%)
								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) Represents management's estimate of discount that market participants would require based on the instrument's lack of liquidity.
	(3) 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.
	31-Dec-14
	(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		1,645			Discounted cash flow analysis	Credit spread embedded in discount rate	600-675 bps (639 bps)
							Discount for lack of marketability(2)	0%-10% (0%)
	Private equity investments		27,367			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(2)	N/A
	Visa derivative liability		1,401			Internal valuation	Estimated future cumulative deposits to the litigation escrow for settlement of the Covered Litigation, and estimated future monthly fees payable to the derivative counterparty	N/A
	31-Dec-14
	(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		$	28,588			Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-100% (46%)
								Estimated selling costs	0%-10% (7%)
	Other loans held for sale		3,411				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-11% (7%)
								Estimated selling costs	0%-10% (7%)
	Other real estate		32,046				Third party appraised value of collateral less estimated selling costs	Discount to appraised value (2)	0%-61% (16%)
								Estimated selling costs	0%-10% (7%)
	Other assets held for sale		3,718				Third party appraised value of collateral less estimated selling costs or BOV	Discount to appraised value (2)	0%-100% (49%)
								Estimated selling costs	0%-10% (7%)
	(1) The range represents management's best estimate of the high and low end 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) Represents management's estimate of discount that market participants would require based on the instrument's lack of liquidity.
	(3) 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, pending sales, and other factors.
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 March 31, 2015 and December 31, 2014 are as follows:
		March 31, 2015
	(in thousands)	Carrying Value				Fair Value			Level 1		Level 2		Level 3
	Financial assets
	Cash and cash equivalents	$	429,338			429,338			429,338		—		—
	Interest bearing funds with Federal Reserve Bank	1,263,886				1,263,886			1,263,886		—		—
	Interest earning deposits with banks	6,871				6,871			6,871		—		—
	Federal funds sold and securities purchased under resale agreements	80,772				80,772			80,772		—		—
	Trading account assets	20,002				20,002			179		19,823		—
	Mortgage loans held for sale	89,245				89,245			—		89,245		—
	Other loans held for sale	1,082				1,082			—		—		1,082
	Investment securities available for sale	3,130,041				3,130,041			52,864		3,075,523		1,654
	Private equity investments	28,126				28,126			—		1,045		27,081
	Mutual funds held in rabbi trusts	11,384				11,384			11,384		—		—
	Loans, net of deferred fees and costs	21,106,213				20,877,101			—		—		20,877,101
	Derivative assets	35,494				35,494			—		35,494		—
	Financial liabilities
	Trading account liabilities	1,575				1,575			—		1,575		—
	Non-interest bearing deposits	6,251,393				6,251,393			—		6,251,393		—
	Interest bearing deposits	15,856,456				15,848,697			—		15,848,697		—
	Federal funds purchased and securities sold under repurchase agreements	125,323				125,323			125,323		—		—
	Long-term debt	2,189,769				2,243,405			—		2,243,405		—
	Derivative liabilities	$	36,030			36,030			—		34,605		1,425
		December 31, 2014
	(in thousands)	Carrying Value				Fair Value			Level 1		Level 2		Level 3
	Financial assets
	Cash and cash equivalents	$	485,489			485,489			485,489		—		—
	Interest bearing funds with Federal Reserve Bank	721,362				721,362			721,362		—		—
	Interest earning deposits with banks	11,810				11,810			11,810		—		—
	Federal funds sold and securities purchased under resale agreements	73,111				73,111			73,111		—		—
	Trading account assets	13,863				13,863			—		13,863		—
	Mortgage loans held for sale	63,328				63,328			—		63,328		—
	Other loans held for sale	3,606				3,606			—		—		3,606
	Investment securities available for sale	3,041,406				3,041,406			51,609		2,988,152		1,645
	Private equity investments	28,362				28,362			—		995		27,367
	Mutual funds held in rabbi trusts	11,252				11,252			11,252		—		—
	Loans, net of deferred fees and costs	21,097,699				20,872,939			—		—		20,872,939
	Derivative assets	32,117				32,117			—		32,117		—
	Financial liabilities
	Trading account liabilities	2,100				2,100			—		2,100		—
	Non-interest bearing deposits	6,228,472				6,228,472			—		6,228,472		—
	Interest bearing deposits	15,303,228				15,299,372			—		15,299,372		—
	Federal funds purchased and securities sold under repurchase agreements	126,916				126,916			126,916		—		—
	Salary stock units	1,206				1,206			1,206		—		—
	Long-term debt	2,140,319				2,191,279			—		2,191,279		—
	Derivative liabilities	$	33,553			33,553			—		32,151		1,401

Derivative_Instruments_Tables

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Summary of Derivative Instruments [Abstract]
Impact of Derivatives on Balance Sheet	The impact of derivative instruments on the consolidated balance sheets at March 31, 2015 and December 31, 2014 is presented below.
		Fair Value of Derivative Assets						Fair Value of Derivative Liabilities
	(in thousands)	Location on Consolidated Balance Sheet	March 31, 2015			December 31, 2014		Location on Consolidated Balance Sheet	March 31, 2015		December 31, 2014
	Derivatives not designated
	as hedging instruments:
	Interest rate contracts	Other assets	$	33,183		30,904		Other liabilities	$	33,856	31,398
	Mortgage derivatives	Other assets	2,311			1,213		Other liabilities	749		753
	Visa derivative		—			—		Other liabilities	1,425		1,401
	Total derivatives not		$	35,494		32,117			$	36,030	33,552
	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 three months ended March 31, 2015 and 2014 is presented below.
		Location of Gain (Loss) Recognized in Income	Gain (Loss) Recognized in Income
	(in thousands)		Three Months Ended March 31,
	Derivatives not designated as hedging instruments		2015			2014
	Interest rate contracts(1)	Other non-interest income	$	(179	)	104
	Mortgage derivatives(2)	Mortgage banking income	1,102			(320	)
	Total		$	923		(216	)
	(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)	3 Months Ended
	Mar. 31, 2015
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 three months ended March 31, 2015 and 2014.
		Three Months Ended March 31,
	(in thousands, except per share data)	2015		2014
	Basic Net Income Per Common Share:
	Net income available to common shareholders	$	51,404	45,857
	Weighted average common shares outstanding	134,933		138,932
	Net income per common share, basic	0.38		0.33
	Diluted Net Income Per Common Share:
	Net income available to common shareholders	51,404		45,857
	Weighted average common shares outstanding	134,933		138,932
	Potentially dilutive shares from assumed exercise of	811		572
	securities or other contracts to purchase common stock
	Weighted average diluted common shares	135,744		139,504
	Net income per common share, diluted	0.38		0.33

Significant_Accounting_Policie2

Significant Accounting Policies (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
LIHTC [Member]
Basis Of Presentation [Line Items]
Investments	$8,700,000
Cash and Cash Equivalents [Member]
Basis Of Presentation [Line Items]
Total deposits	125,000	125,000
Cash and cash equivalents	81,500,000	89,700,000
Interest earning deposits with banks	7,000,000	7,100,000
Federal funds sold	$67,500,000	$67,500,000

Share_Repurchase_Program_Detai

Share Repurchase Program (Details) (Common Stock [Member], USD $)	3 Months Ended	6 Months Ended	1 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2015	Jan. 31, 2015	Dec. 31, 2014	Oct. 21, 2014
Equity, Class of Treasury Stock [Line Items]
Repurchased amount	$59.10	$72.20
Shares repurchased	2,179,986
Additional shares repurchased		2,683,755
Common Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount					250
Repurchased amount	147.2
Shares repurchased	5,600,000
Accelerated Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount				$75
Shares repurchased			391,612	2,510,460

Reverse_Stock_Split_and_Increa1

Reverse Stock Split and Increase in Number of Authorized Common Shares (Details)	0 Months Ended
	Apr. 24, 2014	Mar. 31, 2015	Dec. 31, 2014	Apr. 23, 2014
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	342,857,143	1,200,000,000
Reverse stock splits, shares	342,900,000

Sale_of_Branches_Details

Sale of Branches (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014	Jan. 17, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans		$20,852,842,000	$20,836,382,000
Deposits		22,107,849,000	21,531,700,000
Trust One Bank, Memphis, Tennessee [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans				89,600,000
Deposits				191,300,000
Gain on sale of branches	$5,800,000

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Pledged to secure deposits		$2,050,000,000	$2,120,000,000
Other-than-temporary impairment charges	$88,000

Investment_Securities_Summary_

Investment Securities (Summary Of Available For Sale Investment Securities) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$3,095,060	[1]	$3,020,904	[1]
Gross Unrealized Gains	43,007		32,857
Gross Unrealized Losses	-8,026		-12,355
Fair Value	3,130,041		3,041,406
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	43,139	[1]	42,636	[1]
Gross Unrealized Gains	479		190
Gross Unrealized Losses	0		0
Fair Value	43,618		42,826
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,515	[1]	26,426	[1]
Gross Unrealized Gains	980		898
Gross Unrealized Losses	0		0
Fair Value	25,495		27,324
Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	81,115	[1]	81,332	[1]
Gross Unrealized Gains	664		710
Gross Unrealized Losses	0		0
Fair Value	81,779		82,042
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	169,098	[1]	177,678	[1]
Gross Unrealized Gains	3,112		2,578
Gross Unrealized Losses	-345		-440
Fair Value	171,865		179,816
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,186,379	[1]	2,250,897	[1]
Gross Unrealized Gains	27,536		19,915
Gross Unrealized Losses	-6,246		-9,131
Fair Value	2,207,669		2,261,681
Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	563,513	[1]	414,562	[1]
Gross Unrealized Gains	6,086		4,856
Gross Unrealized Losses	-1,028		-2,342
Fair Value	568,571		417,076
State And Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,941	[1]	5,024	[1]
Gross Unrealized Gains	168		183
Gross Unrealized Losses	-1		-1
Fair Value	5,108		5,206
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,228	[1]	3,228	[1]
Gross Unrealized Gains	3,945		3,520
Gross Unrealized Losses	0
Fair Value	7,173		6,748
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,132	[1]	19,121	[1]
Gross Unrealized Gains	37		7
Gross Unrealized Losses	-406		-441
Fair Value	$18,763		$18,687
[1]	Amortized cost is adjusted for other-than-temporary impairment charges in 2014, which have been recognized in the consolidated statements of income and were considered inconsequential.

Investment_Securities_Schedule

Investment Securities (Schedule Of Unrealized Loss On Investments) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$4,473	$271,472
Less than 12 Months, Unrealized Losses	11	824
12 Months or Longer, Fair Value	839,155	942,667
12 Months or Longer, Unrealized Losses	8,015	11,531
Total Fair Value, Fair Value	843,628	1,214,139
Total Fair Value, Unrealized Losses	8,026	12,355
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	4,473	0
Less than 12 Months, Unrealized Losses	11	0
12 Months or Longer, Fair Value	20,678	21,488
12 Months or Longer, Unrealized Losses	334	440
Total Fair Value, Fair Value	25,151	21,488
Total Fair Value, Unrealized Losses	345	440
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	251,134
Less than 12 Months, Unrealized Losses	0	763
12 Months or Longer, Fair Value	732,387	798,282
12 Months or Longer, Unrealized Losses	6,246	8,368
Total Fair Value, Fair Value	732,387	1,049,416
Total Fair Value, Unrealized Losses	6,246	9,131
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	20,338
Less than 12 Months, Unrealized Losses	0	61
12 Months or Longer, Fair Value	82,318	119,172
12 Months or Longer, Unrealized Losses	1,028	2,281
Total Fair Value, Fair Value	82,318	139,510
Total Fair Value, Unrealized Losses	1,028	2,342
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	46	45
12 Months or Longer, Unrealized Losses	1	1
Total Fair Value, Fair Value	46	45
Total Fair Value, Unrealized Losses	1	1
Other Investments [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	3,726	3,680
12 Months or Longer, Unrealized Losses	406	441
Total Fair Value, Fair Value	3,726	3,680
Total Fair Value, Unrealized Losses	$406	$441

Investment_Securities_Amortize

Investment Securities (Amortized Cost And Estimated Fair Value By Contractual Maturity Of Investment Securities Available For Sale) (Details) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	$18,663
1 to 5 Years, Amortized Cost	121,237
5 to 10 Years, Amortized Cost	1,820,110
More Than 10 years, Amortized Cost	1,129,690
No Stated Maturity, Amortized Cost	5,360
Total, Amortized Cost	3,095,060
Within One Year, Fair Value	18,672
1 to 5 Years, Fair Value	122,900
5 to 10 Years, Fair Value	1,829,164
More Than 10 years, Fair Value	1,150,059
No Stated Maturity, Fair Value	9,246
Total, Fair Value	3,130,041
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	18,286
1 to 5 Years, Amortized Cost	24,853
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	43,139
Within One Year, Fair Value	18,286
1 to 5 Years, Fair Value	25,332
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	43,618
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	12,001
5 to 10 Years, Amortized Cost	12,436
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	24,515
Within One Year, Fair Value	80
1 to 5 Years, Fair Value	12,412
5 to 10 Years, Fair Value	13,003
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	25,495
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	81,115
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	81,115
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	81,779
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	81,779
Mortgage-Backed Securities Issued By U.S. Government Agencies [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	169,098
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	169,098
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	171,865
No Stated Maturity, Fair Value	0
Total, Fair Value	171,865
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	134
1 to 5 Years, Amortized Cost	1,201
5 to 10 Years, Amortized Cost	1,792,674
More Than 10 years, Amortized Cost	392,370
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	2,186,379
Within One Year, Fair Value	140
1 to 5 Years, Fair Value	1,271
5 to 10 Years, Fair Value	1,801,124
More Than 10 years, Fair Value	405,134
No Stated Maturity, Fair Value	0
Total, Fair Value	2,207,669
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	563,513
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	563,513
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	568,571
No Stated Maturity, Fair Value	0
Total, Fair Value	568,571
State And Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	165
1 to 5 Years, Amortized Cost	2,067
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	2,709
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	4,941
Within One Year, Fair Value	166
1 to 5 Years, Fair Value	2,106
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	2,836
No Stated Maturity, Fair Value	0
Total, Fair Value	5,108
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	7,173
Total, Fair Value	7,173
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	15,000
More Than 10 years, Amortized Cost	2,000
No Stated Maturity, Amortized Cost	2,132
Total, Amortized Cost	19,132
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	15,037
More Than 10 years, Fair Value	1,653
No Stated Maturity, Fair Value	2,073
Total, Fair Value	$18,763

Investment_Securities_Summary_1

Investment Securities (Summary Of Sales Transactions In The Investment Securities Available For Sale Portfolio) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investments [Abstract]
Proceeds from sale and maturity of investment securities available for sale	$32,419	$20,815
Gross realized gains	725	1,419
Gross realized losses	0	-88
Investment securities gains, net	$725	$1,331

Restructuring_Charges_Narrativ

Restructuring Charges (Narrative) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Gain on disposition of certain branch locations	$157
Other operating expenses	20,147	20,110
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Other operating expenses	$50

Restructuring_Charges_Schedule

Restructuring Charges (Schedule Of Restructuring And Related Costs) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Restructuring Charges [Abstract]
Severance charges	$0	$8,047
Gain on sale of assets held for sale, net	-157	0
Professional fees and other charges	50	530
Total restructuring charges, net	($107)	$8,577

Restructuring_Charges_Restruct

Restructuring Charges (Restructuring Reserve) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Beginning balance	$8,830	$2,955
Accruals for efficiency initiatives		8,047
Payments	-742	-3,220
Ending balance	8,088	7,782
Severance Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	3,291	1,572
Accruals for efficiency initiatives		8,047
Payments	-521	-1,931
Ending balance	2,770	7,688
Lease Termination Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	5,539	1,383
Accruals for efficiency initiatives		0
Payments	-221	-1,289
Ending balance	$5,318	$94

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		$754,303,000
Provision for loan losses	-4,397,000	-9,511,000
Interest income recognized	2,636,000	0	14,861,000
Average recorded investment in impaired loans	427,391,000	754,300,000	622,046,000
Interest income recognized for accruing TDRs		4,000,000
Accruing troubled debt restructuring	313,400,000		348,400,000
Allowance for loan losses	253,371,000	300,871,000	261,317,000	307,560,000
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	313,400,000		348,400,000
Allowance for loan losses	17,600,000		21,000,000
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
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans	0	0
Provision for loan losses	0	23,000,000
Allowance for loan losses	$0	$0	$0	$23,000,000

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses (Schedule Of Current, Accruing Past Due And Nonaccrual Loans) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	$20,883,906,000	$20,879,481,000
Accruing 30-89 Days Past Due	52,418,000	46,614,000
Accruing 90 Days or Greater Past Due	5,025,000	4,637,000
Total Accruing Past Due	57,443,000	51,251,000
Non-accrual	194,232,000	197,757,000
Total loans	21,135,581,000	21,128,489,000	20,187,440,000
Deferred fees and costs, net	29,400,000	30,800,000	28,400,000
Home Equity Lines [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,647,045,000	1,659,869,000
Accruing 30-89 Days Past Due	5,301,000	6,992,000
Accruing 90 Days or Greater Past Due	759,000	703,000
Total Accruing Past Due	6,060,000	7,695,000
Non-accrual	18,933,000	16,434,000
Total loans	1,672,038,000	1,683,998,000
Consumer Mortgages [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,667,761,000	1,648,145,000
Accruing 30-89 Days Past Due	9,276,000	12,626,000
Accruing 90 Days or Greater Past Due	0	12,000
Total Accruing Past Due	9,276,000	12,638,000
Non-accrual	25,351,000	33,278,000
Total loans	1,702,388,000	1,694,061,000
Credit Cards [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	239,150,000	250,304,000
Accruing 30-89 Days Past Due	1,767,000	1,971,000
Accruing 90 Days or Greater Past Due	1,340,000	1,374,000
Total Accruing Past Due	3,107,000	3,345,000
Non-accrual	0	0
Total loans	242,257,000	253,649,000
Other Retail Loans [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	299,529,000	297,703,000
Accruing 30-89 Days Past Due	2,299,000	2,361,000
Accruing 90 Days or Greater Past Due	10,000	101,000
Total Accruing Past Due	2,309,000	2,462,000
Non-accrual	2,211,000	2,295,000
Total loans	304,049,000	302,460,000
Investment Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	5,201,493,000	5,187,200,000
Accruing 30-89 Days Past Due	2,579,000	1,851,000
Accruing 90 Days or Greater Past Due	211,000	0
Total Accruing Past Due	2,790,000	1,851,000
Non-accrual	19,780,000	20,720,000
Total loans	5,224,063,000	5,209,771,000
1-4 Family Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,096,543,000	1,106,111,000
Accruing 30-89 Days Past Due	3,954,000	4,067,000
Accruing 90 Days or Greater Past Due	291,000	432,000
Total Accruing Past Due	4,245,000	4,499,000
Non-accrual	22,827,000	24,197,000
Total loans	1,123,615,000	1,134,807,000
Land Acquisition [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	526,185,000	540,932,000
Accruing 30-89 Days Past Due	1,704,000	363,000
Accruing 90 Days or Greater Past Due	4,000	0
Total Accruing Past Due	1,708,000	363,000
Non-accrual	31,444,000	34,375,000
Total loans	559,337,000	575,670,000
Commercial Real Estate [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,824,221,000	6,834,243,000
Accruing 30-89 Days Past Due	8,237,000	6,281,000
Accruing 90 Days or Greater Past Due	506,000	432,000
Total Accruing Past Due	8,743,000	6,713,000
Non-accrual	74,051,000	79,292,000
Total loans	6,907,015,000	6,920,248,000
Commercial, Financial and Agricultural [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,155,867,000	6,172,220,000
Accruing 30-89 Days Past Due	17,834,000	9,979,000
Accruing 90 Days or Greater Past Due	2,410,000	1,790,000
Total Accruing Past Due	20,244,000	11,769,000
Non-accrual	42,060,000	40,359,000
Total loans	6,218,171,000	6,224,348,000
Owner-Occupied [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	4,050,333,000	4,016,997,000
Accruing 30-89 Days Past Due	7,704,000	6,404,000
Accruing 90 Days or Greater Past Due	0	225,000
Total Accruing Past Due	7,704,000	6,629,000
Non-accrual	31,626,000	26,099,000
Total loans	4,089,663,000	4,049,725,000
Commercial and Industrial [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	10,206,200,000	10,189,217,000
Accruing 30-89 Days Past Due	25,538,000	16,383,000
Accruing 90 Days or Greater Past Due	2,410,000	2,015,000
Total Accruing Past Due	27,948,000	18,398,000
Non-accrual	73,686,000	66,458,000
Total loans	10,307,834,000	10,274,073,000
Retail [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	3,853,485,000	3,856,021,000
Accruing 30-89 Days Past Due	18,643,000	23,950,000
Accruing 90 Days or Greater Past Due	2,109,000	2,190,000
Total Accruing Past Due	20,752,000	26,140,000
Non-accrual	46,495,000	52,007,000
Total loans	$3,920,732,000	$3,934,168,000

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total loans	21,135,581,000	$21,128,489,000	$20,187,440,000
Nonaccrual substandard loans	170,500,000	170,900,000
Deferred fees and costs, net	29,400,000	30,800,000	28,400,000
Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Allowance for loan losses, percent of loan amount	50.00%
Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,672,038,000	1,683,998,000
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,702,388,000	1,694,061,000
Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	242,257,000	253,649,000
Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	304,049,000	302,460,000
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,307,834,000	10,274,073,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,907,015,000	6,920,248,000
Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,224,063,000	5,209,771,000
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,123,615,000	1,134,807,000
Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	559,337,000	575,670,000
Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,218,171,000	6,224,348,000
Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,089,663,000	4,049,725,000
Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,920,732,000	3,934,168,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	20,033,391,000	19,940,436,000
Pass [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,644,215,000	1,659,794,000
Pass [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,669,848,000	1,653,491,000
Pass [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	240,917,000	252,275,000
Pass [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	300,846,000	298,991,000
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,804,632,000	9,737,986,000
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,372,933,000	6,337,899,000
Pass [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,959,969,000	4,932,440,000
Pass [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	956,789,000	944,646,000
Pass [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	456,175,000	460,813,000
Pass [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,956,395,000	5,945,725,000
Pass [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,848,237,000	3,792,261,000
Pass [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,855,826,000	3,864,551,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	499,741,000	553,990,000
Special Mention [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	220,774,000	241,426,000
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	278,967,000	312,564,000
Special Mention [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	156,878,000	174,466,000
Special Mention [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	74,830,000	86,072,000
Special Mention [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	47,259,000	52,026,000
Special Mention [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	136,454,000	145,779,000
Special Mention [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	84,320,000	95,647,000
Special Mention [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	577,368,000	607,161,000
Substandard [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,001,000	20,043,000
Substandard [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	30,358,000	37,656,000
Substandard [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	455,000	495,000
Substandard [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,079,000	3,339,000
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	272,215,000	284,270,000
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	247,260,000	261,358,000
Substandard [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	107,216,000	102,865,000
Substandard [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	84,726,000	96,392,000
Substandard [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	55,318,000	62,101,000
Substandard [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	115,881,000	123,225,000
Substandard [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	156,334,000	161,045,000
Substandard [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	57,893,000	61,533,000
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	21,426,000	22,988,000
Doubtful [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,793,000	2,009,000
Doubtful [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,056,000	2,654,000
Doubtful [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,000	32,000
Doubtful [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,690,000	9,866,000
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,855,000	8,427,000
Doubtful [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,270,000	7,697,000
Doubtful [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	585,000	730,000
Doubtful [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,363,000	9,539,000
Doubtful [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	327,000	327,000
Doubtful [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,881,000	4,695,000
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,655,000	3,914,000
Loss [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,029,000	2,152,000
Loss [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	126,000	260,000
Loss [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	885,000	879,000
Loss [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	92,000	98,000
Loss [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	523,000	525,000
Loss [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	78,000	80,000
Loss [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	445,000	445,000
Loss [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,132,000	$3,389,000

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
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	$261,317,000	$307,560,000
Allowance for loan losses of sold branches		-1,019,000
Charge-offs	-20,624,000	-22,275,000
Recoveries	8,281,000	7,094,000
Provision for loan losses	4,397,000	9,511,000
Ending balance, allowance	253,371,000	300,871,000
Ending balance: individually evaluated for impairment, allowance		65,167,000
Impaired Financing Receivable, Related Allowance	29,006,000		33,476,000
Ending balance: collectively evaluated for impairment, allowance	224,365,000	235,704,000
Total loans	21,135,581,000	20,187,440,000	21,128,489,000
Ending balance: individually evaluated for impairment, loans		754,303,000
Ending balance: collectively evaluated for impairment, loans	20,726,896,000	19,433,137,000
Deferred fees and costs, net	29,400,000	28,400,000	30,800,000
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	101,471,000	127,012,000
Allowance for loan losses of sold branches		-281,000
Charge-offs	-7,440,000	-7,946,000
Recoveries	3,941,000	2,227,000
Provision for loan losses	-3,764,000	5,943,000
Ending balance, allowance	94,208,000	126,955,000
Ending balance: individually evaluated for impairment, allowance	18,558,000	42,894,000
Ending balance: collectively evaluated for impairment, allowance	75,650,000	84,061,000
Total loans	6,907,015,000	6,587,254,000
Ending balance: individually evaluated for impairment, loans	237,167,000	481,684,000
Ending balance: collectively evaluated for impairment, loans	6,669,848,000	6,105,570,000
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	118,110,000	116,069,000
Allowance for loan losses of sold branches		-398,000
Charge-offs	-5,272,000	-8,036,000
Recoveries	2,266,000	1,953,000
Provision for loan losses	2,702,000	18,758,000
Ending balance, allowance	117,806,000	128,346,000
Ending balance: individually evaluated for impairment, allowance		20,678,000
Impaired Financing Receivable, Related Allowance	9,411,000
Ending balance: collectively evaluated for impairment, allowance	108,395,000	107,668,000
Total loans	10,307,834,000	9,961,281,000
Ending balance: individually evaluated for impairment, loans	130,197,000	220,376,000
Ending balance: collectively evaluated for impairment, loans	10,177,637,000	9,740,905,000
Retail [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	41,736,000	41,479,000
Allowance for loan losses of sold branches		-340,000
Charge-offs	-7,912,000	-6,293,000
Recoveries	2,074,000	2,914,000
Provision for loan losses	5,459,000	7,810,000
Ending balance, allowance	41,357,000	45,570,000
Ending balance: individually evaluated for impairment, allowance	1,037,000	1,595,000
Ending balance: collectively evaluated for impairment, allowance	40,320,000	43,975,000
Total loans	3,920,732,000	3,638,905,000
Ending balance: individually evaluated for impairment, loans	41,321,000	52,243,000
Ending balance: collectively evaluated for impairment, loans	3,879,411,000	3,586,662,000
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance, allowance	0	23,000,000
Allowance for loan losses of sold branches		0
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	0	-23,000,000
Ending balance, allowance	0	0
Ending balance: individually evaluated for impairment, allowance	0	0
Ending balance: collectively evaluated for impairment, allowance	0	0
Total loans	0	0
Ending balance: individually evaluated for impairment, loans	0	0
Ending balance: collectively evaluated for impairment, loans	$0	$0

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses (Schedule Of Impaired Loans) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$65,977,000		$65,256,000
Recorded Investment, With allowance recorded	342,708,000		376,892,000
Recorded Investment	408,685,000		442,148,000
Unpaid Principal Balance, With no related allowance recorded	125,441,000		125,470,000
Unpaid Principal Balance, With allowance recorded	346,456,000		380,036,000
Unpaid Principal Balance	471,897,000		505,506,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	29,006,000		33,476,000
Related Allowance	29,006,000		33,476,000
Average Recorded Investment, With no related allowance recorded	63,212,000		90,590,000
Average Recorded Investment, With allowance recorded	364,179,000		531,456,000
Average Recorded Investment	427,391,000	754,300,000	622,046,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	2,636,000		14,861,000
Interest Income Recognized	2,636,000	0	14,861,000
Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0
Recorded Investment, With allowance recorded	6,317,000		4,848,000
Recorded Investment	6,317,000		4,848,000
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With allowance recorded	6,317,000		4,848,000
Unpaid Principal Balance	6,317,000		4,848,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	180,000		129,000
Related Allowance	180,000		129,000
Average Recorded Investment, With no related allowance recorded	0		0
Average Recorded Investment, With allowance recorded	5,664,000		3,604,000
Average Recorded Investment	5,664,000		3,604,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	59,000		1,405,000
Interest Income Recognized	59,000		1,405,000
Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	995,000		995,000
Recorded Investment, With allowance recorded	28,842,000		33,450,000
Recorded Investment	29,837,000		34,445,000
Unpaid Principal Balance, With no related allowance recorded	2,065,000		2,065,000
Unpaid Principal Balance, With allowance recorded	28,842,000		33,450,000
Unpaid Principal Balance	30,907,000		35,515,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	783,000		1,040,000
Related Allowance	783,000		1,040,000
Average Recorded Investment, With no related allowance recorded	995,000		1,352,000
Average Recorded Investment, With allowance recorded	31,299,000		39,427,000
Average Recorded Investment	32,294,000		40,779,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	345,000		115,000
Interest Income Recognized	345,000		115,000
Credit Card Receivable [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0
Recorded Investment, With allowance recorded	0		0
Recorded Investment	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With allowance recorded	0		0
Unpaid Principal Balance	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	0		0
Related Allowance	0		0
Average Recorded Investment, With no related allowance recorded	0		0
Average Recorded Investment, With allowance recorded	0		0
Average Recorded Investment	0		0
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	0		0
Interest Income Recognized	0		0
Other Retail Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0
Recorded Investment, With allowance recorded	5,167,000		5,293,000
Recorded Investment	5,167,000		5,293,000
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With allowance recorded	5,167,000		5,293,000
Unpaid Principal Balance	5,167,000		5,293,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	74,000		101,000
Related Allowance	74,000		101,000
Average Recorded Investment, With no related allowance recorded	0		0
Average Recorded Investment, With allowance recorded	5,252,000		4,997,000
Average Recorded Investment	5,252,000		4,997,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	84,000		315,000
Interest Income Recognized	84,000		315,000
Investment Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	14,636,000		15,368,000
Recorded Investment, With allowance recorded	96,020,000		81,758,000
Recorded Investment	110,656,000		97,126,000
Unpaid Principal Balance, With no related allowance recorded	19,382,000		20,237,000
Unpaid Principal Balance, With allowance recorded	98,622,000		83,963,000
Unpaid Principal Balance	118,004,000		104,200,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	7,374,000		5,413,000
Related Allowance	7,374,000		5,413,000
Average Recorded Investment, With no related allowance recorded	14,964,000		25,311,000
Average Recorded Investment, With allowance recorded	86,415,000		129,289,000
Average Recorded Investment	101,379,000		154,600,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	631,000		3,690,000
Interest Income Recognized	631,000		3,690,000
1-4 Family Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,730,000		2,981,000
Recorded Investment, With allowance recorded	65,228,000		80,625,000
Recorded Investment	67,958,000		83,606,000
Unpaid Principal Balance, With no related allowance recorded	10,080,000		10,520,000
Unpaid Principal Balance, With allowance recorded	66,010,000		81,357,000
Unpaid Principal Balance	76,090,000		91,877,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	7,594,000		11,442,000
Related Allowance	7,594,000		11,442,000
Average Recorded Investment, With no related allowance recorded	2,888,000		5,441,000
Average Recorded Investment, With allowance recorded	72,534,000		94,773,000
Average Recorded Investment	75,422,000		100,214,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	356,000		2,645,000
Interest Income Recognized	356,000		2,645,000
Land Acquisition [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	22,359,000		21,504,000
Recorded Investment, With allowance recorded	36,194,000		49,300,000
Recorded Investment	58,553,000		70,804,000
Unpaid Principal Balance, With no related allowance recorded	63,276,000		61,843,000
Unpaid Principal Balance, With allowance recorded	36,416,000		49,483,000
Unpaid Principal Balance	99,692,000		111,326,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	3,590,000		4,900,000
Related Allowance	3,590,000		4,900,000
Average Recorded Investment, With no related allowance recorded	20,814,000		29,954,000
Average Recorded Investment, With allowance recorded	44,493,000		89,195,000
Average Recorded Investment	65,307,000		119,149,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	283,000		1,689,000
Interest Income Recognized	283,000		1,689,000
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	39,725,000		39,853,000
Recorded Investment, With allowance recorded	197,442,000		211,683,000
Recorded Investment	237,167,000		251,536,000
Unpaid Principal Balance, With no related allowance recorded	92,738,000		92,600,000
Unpaid Principal Balance, With allowance recorded	201,048,000		214,803,000
Unpaid Principal Balance	293,786,000		307,403,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	18,558,000		21,755,000
Related Allowance	18,558,000		21,755,000
Average Recorded Investment, With no related allowance recorded	38,666,000		60,706,000
Average Recorded Investment, With allowance recorded	203,442,000		313,257,000
Average Recorded Investment	242,108,000		373,963,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	1,270,000		8,024,000
Interest Income Recognized	1,270,000		8,024,000
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	6,504,000		7,391,000
Recorded Investment, With allowance recorded	44,477,000		59,035,000
Recorded Investment	50,981,000		66,426,000
Unpaid Principal Balance, With no related allowance recorded	9,187,000		11,193,000
Unpaid Principal Balance, With allowance recorded	44,615,000		59,041,000
Unpaid Principal Balance	53,802,000		70,234,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	6,556,000		7,597,000
Related Allowance	6,556,000		7,597,000
Average Recorded Investment, With no related allowance recorded	5,993,000		8,984,000
Average Recorded Investment, With allowance recorded	54,651,000		91,221,000
Average Recorded Investment	60,644,000		100,205,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	369,000		2,392,000
Interest Income Recognized	369,000		2,392,000
Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	18,753,000		17,017,000
Recorded Investment, With allowance recorded	60,463,000		62,583,000
Recorded Investment	79,216,000		79,600,000
Unpaid Principal Balance, With no related allowance recorded	21,451,000		19,612,000
Unpaid Principal Balance, With allowance recorded	60,467,000		62,601,000
Unpaid Principal Balance	81,918,000		82,213,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	2,855,000		2,854,000
Related Allowance	2,855,000		2,854,000
Average Recorded Investment, With no related allowance recorded	17,558,000		19,548,000
Average Recorded Investment, With allowance recorded	63,871,000		78,950,000
Average Recorded Investment	81,429,000		98,498,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	509,000		2,610,000
Interest Income Recognized	509,000		2,610,000
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	25,257,000		24,408,000
Recorded Investment, With allowance recorded	104,940,000		121,618,000
Recorded Investment	130,197,000		146,026,000
Unpaid Principal Balance, With no related allowance recorded	30,638,000		30,805,000
Unpaid Principal Balance, With allowance recorded	105,082,000		121,642,000
Unpaid Principal Balance	135,720,000		152,447,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	9,411,000		10,451,000
Related Allowance			10,451,000
Average Recorded Investment, With no related allowance recorded	23,551,000		28,532,000
Average Recorded Investment, With allowance recorded	118,522,000		170,171,000
Average Recorded Investment	142,073,000		198,703,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	878,000		5,002,000
Interest Income Recognized	878,000		5,002,000
Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	995,000		995,000
Recorded Investment, With allowance recorded	40,326,000		43,591,000
Recorded Investment	41,321,000		44,586,000
Unpaid Principal Balance, With no related allowance recorded	2,065,000		2,065,000
Unpaid Principal Balance, With allowance recorded	40,326,000		43,591,000
Unpaid Principal Balance	42,391,000		45,656,000
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With allowance recorded	1,037,000		1,270,000
Related Allowance	1,037,000		1,270,000
Average Recorded Investment, With no related allowance recorded	995,000		1,352,000
Average Recorded Investment, With allowance recorded	42,215,000		48,028,000
Average Recorded Investment	43,210,000		49,380,000
Interest Income Recognized, With no related allowance recorded	0		0
Interest Income Recognized, With allowance recorded	488,000		1,835,000
Interest Income Recognized	$488,000		$1,835,000

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
	Contract	Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	74	52
Recorded Investment	$46,434,000	$22,635,000
Net charge-offs	4,000,000	0
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	11	2
Recorded Investment	1,110,000	287,000
Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	11	1
Recorded Investment	1,031,000	101,000
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	6	4
Recorded Investment	321,000	117,000
Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	5
Recorded Investment	20,536,000	7,674,000
1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	13	11
Recorded Investment	17,829,000	2,543,000
Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	1
Recorded Investment	963,000	534,000
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	19	17
Recorded Investment	39,328,000	10,751,000
Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	25	21
Recorded Investment	2,905,000	6,073,000
Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	7
Recorded Investment	1,739,000	5,306,000
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	27	28
Recorded Investment	4,644,000	11,379,000
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	28	7
Recorded Investment	2,462,000	505,000
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	14,823,000	0
Principal Forgiveness [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	14,823,000	0
Principal Forgiveness [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	14,823,000	0
Principal Forgiveness [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Principal Forgiveness [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0
Below Market Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	24,274,000	12,193,000
Below Market Interest Rate [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	975,000	241,000
Below Market Interest Rate [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	245,000	101,000
Below Market Interest Rate [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Below Market Interest Rate [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	257,000	0
Below Market Interest Rate [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	16,932,000	7,143,000
Below Market Interest Rate [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,856,000	429,000
Below Market Interest Rate [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	255,000	0
Below Market Interest Rate [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	20,043,000	7,572,000
Below Market Interest Rate [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,015,000	1,791,000
Below Market Interest Rate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,739,000	2,488,000
Below Market Interest Rate [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,754,000	4,279,000
Below Market Interest Rate [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,477,000	342,000
Term Extensions and or Other Concessions [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	7,337,000	10,442,000
Term Extensions and or Other Concessions [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	135,000	46,000
Term Extensions and or Other Concessions [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	786,000	0
Term Extensions and or Other Concessions [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0
Term Extensions and or Other Concessions [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	64,000	117,000
Term Extensions and or Other Concessions [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	3,604,000	531,000
Term Extensions and or Other Concessions [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	150,000	2,114,000
Term Extensions and or Other Concessions [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	708,000	534,000
Term Extensions and or Other Concessions [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	4,462,000	3,179,000
Term Extensions and or Other Concessions [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,890,000	4,282,000
Term Extensions and or Other Concessions [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	2,818,000
Term Extensions and or Other Concessions [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,890,000	7,100,000
Term Extensions and or Other Concessions [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	$985,000	$163,000

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
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	Contract	Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	2
Recorded Investment	$115	$708
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	0
Recorded Investment	34	0
Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	0
Recorded Investment	81	0
Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	1
Recorded Investment	0	186
1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	1
Recorded Investment	0	186
Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	1
Recorded Investment	0	522
Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0
Recorded Investment	0	0
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	1
Recorded Investment	0	522
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	0
Recorded Investment	$115	$0

Other_Real_Estate_Details

Other Real Estate (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other real estate	$74,791,000		$85,472,000
Loans foreclosed and transferred to other real estate	5,400,000	12,900,000
Foreclosed real estate expense, net	9,496,000	5,681,000
Write-downs to net realizable value and losses resulting from sales transactions	$7,275,000	$4,752,000

Other_Comprehensive_Income_Los2

Other Comprehensive Income (Loss) (Narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	($3,651)	($12,605)	($30,463)	($41,258)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	-12,755	-12,824	-13,030	-13,099
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)	8,198	-713	-18,166	-28,936
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
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	($12,605)	($41,258)
Other comprehensive income (loss) before reclassifications	9,355	11,588
Amounts reclassified from accumulated other comprehensive income (loss)	-401	-793
Net current period other comprehensive income (loss)	8,954	10,795
Ending balance	-3,651	-30,463
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	-12,824	-13,099
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	69	69
Net current period other comprehensive income (loss)	69	69
Ending balance	-12,755	-13,030
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	-713	-28,936
Other comprehensive income (loss) before reclassifications	9,355	11,588
Amounts reclassified from accumulated other comprehensive income (loss)	-444	-818
Net current period other comprehensive income (loss)	8,911	10,770
Ending balance	8,198	-18,166
Post-Retirement Unfunded Health Benefit [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	932	777
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	-26	-44
Net current period other comprehensive income (loss)	-26	-44
Ending balance	$906	$733

Other_Comprehensive_Income_Los4

Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	($28,138)	($27,868)
Income tax (expense) benefit	-31,849	-28,608
Investment securities gains, net	725	1,331
Salaries and other personnel expense	-178,908	-184,161
Net income available to common shareholders	51,404	45,857
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	-112	-112
Income tax (expense) benefit	43	43
Net income available to common shareholders	-69	-69
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	-281	-513
Investment securities gains, net	725	1,331
Net income available to common shareholders	444	818
Post-Retirement Unfunded Health Benefit [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	-16	-28
Salaries and other personnel expense	42	72
Net income available to common shareholders	$26	$44

Fair_Value_Accounting_Financia

Fair Value Accounting (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$20,002	$13,863
Investment securities available for sale	3,130,041	3,041,406
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	171,865	179,816
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	568,571	417,076
State And Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	5,108	5,206
Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	18,763	18,687
U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	43,618	42,826
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	2,207,669	2,261,681
Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	7,173	6,748
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	179	0
Investment securities available for sale	52,864	51,609
Private equity investments	0	0
Derivative assets	0	0
Salary stock units		1,206
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	19,823	13,863
Investment securities available for sale	3,075,523	2,988,152
Private equity investments	1,045	995
Derivative assets	35,494	32,117
Salary stock units		0
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	1,654	1,645
Private equity investments	27,081	27,367
Derivative assets	0	0
Salary stock units		0
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	20,002	13,863
Mortgage loans held for sale	89,245	63,328
Investment securities available for sale	3,130,041	3,041,406
Private equity investments	28,126	28,362
Mutual funds held in Rabbi Trusts	11,384	11,252
Derivative assets	35,494	32,117
Trading account liabilities	1,575
Salary stock units		1,206
Derivative liabilities	36,030	33,552
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	71	145
Investment securities available for sale	171,865	179,816
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	3,390	2,449
Investment securities available for sale	568,571	417,076
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	646	1,976
Investment securities available for sale	5,108	5,206
Fair Value, Measurements, Recurring [Member] | All Other Mortgage-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	6,404	2,483
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,491	6,810
Investment securities available for sale	18,763	18,687
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	43,618	42,826
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	25,495	27,324
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	81,779	82,042
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	2,207,669	2,261,681
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	7,173	6,748
Fair Value, Measurements, Recurring [Member] | Mortgages [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading account liabilities		2,100
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	33,183	30,904
Derivative liabilities	33,856	31,398
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	2,311	1,213
Derivative liabilities	749	753
Fair Value, Measurements, Recurring [Member] | Other Derivative Contracts, Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	1,425	1,401
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	179	0
Mortgage loans held for sale	0	0
Investment securities available for sale	52,864	51,609
Private equity investments	0	0
Mutual funds held in Rabbi Trusts	11,384	11,252
Derivative assets	0	0
Trading account liabilities	0
Salary stock units		1,206
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	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
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	179	0
Investment securities available for sale	2,073	2,035
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	43,618	42,826
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	7,173	6,748
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
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
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	19,823	13,863
Mortgage loans held for sale	89,245	63,328
Investment securities available for sale	3,075,523	2,988,152
Private equity investments	1,045	995
Mutual funds held in Rabbi Trusts	0	0
Derivative assets	35,494	32,117
Trading account liabilities	1,575
Salary stock units		0
Derivative liabilities	34,605	32,151
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	71	145
Investment securities available for sale	171,865	179,816
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	3,390	2,449
Investment securities available for sale	568,571	417,076
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	646	1,976
Investment securities available for sale	5,108	5,206
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	6,404	2,483
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,312	6,810
Investment securities available for sale	15,036	15,007
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	25,495	27,324
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	81,779	82,042
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	2,207,669	2,261,681
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		2,100
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	33,183	30,904
Derivative liabilities	33,856	31,398
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	2,311	1,213
Derivative liabilities	749	753
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	1,654	1,645
Private equity investments	27,081	27,367
Mutual funds held in Rabbi Trusts	0	0
Derivative assets	0	0
Trading account liabilities	0
Salary stock units		0
Derivative liabilities	1,425	1,401
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	1,654	1,645
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	0
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
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	$1,425	$1,401

Fair_Value_Accounting_Changes_

Fair Value Accounting (Changes In Fair Value Included In Consolidated Statements Of Income) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Mortgage loans held for sale	$410	$725
Aggregate fair value	89,245		63,328
Unpaid principal balance	86,995		61,488
Fair value less aggregate unpaid principal balance	$2,250		$1,840

Fair_Value_Accounting_Changes_1

Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investment Securities Available for Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$1,645	$2,350
Included in earnings	0	-88
Unrealized gains (losses) included in other comprehensive income	9	137
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance	1,654	2,399
The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	0	-88
Private Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	27,367	27,745
Included in earnings	-286	-250
Unrealized gains (losses) included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance	27,081	27,495
The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	-286	-250
Visa Derivative [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	-1,401	-2,706
Included in earnings	-375	-396
Unrealized gains (losses) included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	351	577
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance	-1,425	-2,525
The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	($375)	($396)

Fair_Value_Accounting_Assets_A

Fair Value Accounting (Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$408,685	$442,148
Other real estate	74,791	85,472
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	1,082	3,606
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	3,282	28,588
Other loans held for sale	0	3,411
Other real estate	69,331	32,046
Other assets held for sale	0	3,718
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	0
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	0
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	3,282	28,588
Other loans held for sale	0	3,411
Other real estate	69,331	32,046
Other assets held for sale	$0	$3,718

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
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	$1,045	$2,655
Other Loans Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	0	303
Other Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	$6,681	$2,637

Fair_Value_Accounting_Fair_Val

Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Visa Derivative [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	-1,425	-1,401	($2,525)	($2,706)
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate		6.00%
Discount for lack of marketability	0.00%	0.00%
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate		6.75%
Discount for lack of marketability	10.00%	10.00%
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate		6.39%
Discount for lack of marketability	0.00%	0.00%
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	1,654	1,645
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	4.85%
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	5.85%
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	5.35%
Fair Value, Measurements, Recurring [Member] | Private Equity Investments [Member] | Individual Analysis of Each Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	27,081
Fair Value, Measurements, Recurring [Member] | Private Equity Investments [Member] | Individual Analysis of Each Investee Company [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure		27,367
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Probability Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	1,425	1,401
Fair Value, Measurements, Recurring [Member] | Collateral Dependent Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		0.00%
Estimated selling costs		0.00%
Fair Value, Measurements, Recurring [Member] | Collateral Dependent Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		100.00%
Estimated selling costs		10.00%
Fair Value, Measurements, Recurring [Member] | Collateral Dependent Impaired Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		46.00%
Estimated selling costs		7.00%
Fair Value, Measurements, Recurring [Member] | Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%
Estimated selling costs	0.00%
Fair Value, Measurements, Recurring [Member] | Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	83.00%
Estimated selling costs	10.00%
Fair Value, Measurements, Recurring [Member] | Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	34.00%
Estimated selling costs	7.00%
Fair Value, Measurements, Recurring [Member] | Other Loans Held for Sale [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		0.00%
Estimated selling costs		0.00%
Fair Value, Measurements, Recurring [Member] | Other Loans Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		11.00%
Estimated selling costs		10.00%
Fair Value, Measurements, Recurring [Member] | Other Loans Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		7.00%
Estimated selling costs		7.00%
Fair Value, Measurements, Recurring [Member] | Other Real Estate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		0.00%
Estimated selling costs		0.00%
Fair Value, Measurements, Recurring [Member] | Other Real Estate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		61.00%
Estimated selling costs		10.00%
Fair Value, Measurements, Recurring [Member] | Other Real Estate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		16.00%
Estimated selling costs		7.00%
Fair Value, Measurements, Recurring [Member] | Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%
Estimated selling costs	0.00%
Fair Value, Measurements, Recurring [Member] | Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	42.00%
Estimated selling costs	10.00%
Fair Value, Measurements, Recurring [Member] | Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	8.00%
Estimated selling costs	7.00%
Fair Value, Measurements, Recurring [Member] | Other Assets Held for Sale [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		5.00%
Estimated selling costs		0.00%
Fair Value, Measurements, Recurring [Member] | Other Assets Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		100.00%
Estimated selling costs		10.00%
Fair Value, Measurements, Recurring [Member] | Other Assets Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		49.00%
Estimated selling costs		7.00%
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	3,282	28,588
Fair Value, Measurements, Nonrecurring [Member] | Other Loans Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure		3,411
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	69,331	32,046
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure		3,718

Fair_Value_Accounting_Carrying

Fair Value Accounting (Carrying And Estimated Fair Values Of Financial Instruments Carried On Balance Sheet) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$429,338	$485,489
Interest bearing funds with Federal Reserve Bank	1,263,886	721,362
Interest earning deposits with banks	6,871	11,810
Federal funds sold and securities purchased under resale agreements	80,772	73,111
Trading account assets	20,002	13,863
Mortgage loans held for sale	89,245	63,328
Investment securities available for sale	3,130,041	3,041,406
Loans, net	20,852,842	20,836,382
Non-interest bearing deposits	6,251,393	6,228,472
Federal funds purchased and securities sold under repurchase agreements	125,323	126,916
Long-term debt	2,189,769	2,140,319
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	429,338	485,489
Interest bearing funds with Federal Reserve Bank	1,263,886	721,362
Interest earning deposits with banks	6,871	11,810
Federal funds sold and securities purchased under resale agreements	80,772	73,111
Trading account assets	179	0
Mortgage loans held for sale	0	0
Other loans held for sale	0	0
Investment securities available for sale	52,864	51,609
Private equity investments	0	0
Mutual funds held in Rabbi Trusts	11,384	11,252
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	125,323	126,916
Salary stock units		1,206
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	19,823	13,863
Mortgage loans held for sale	89,245	63,328
Other loans held for sale	0	0
Investment securities available for sale	3,075,523	2,988,152
Private equity investments	1,045	995
Mutual funds held in Rabbi Trusts	0	0
Loans, net	0	0
Derivative asset positions	35,494	32,117
Trading account liabilities	1,575	2,100
Non-interest bearing deposits	6,251,393	6,228,472
Interest bearing deposits	15,848,697	15,299,372
Federal funds purchased and securities sold under repurchase agreements	0	0
Salary stock units		0
Long-term debt	2,243,405	2,191,279
Derivative liability positions	34,605	32,151
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	1,082	3,606
Investment securities available for sale	1,654	1,645
Private equity investments	27,081	27,367
Mutual funds held in Rabbi Trusts	0	0
Loans, net	20,877,101	20,872,939
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
Long-term debt	0	0
Derivative liability positions	1,425	1,401
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	429,338	485,489
Interest bearing funds with Federal Reserve Bank	1,263,886	721,362
Interest earning deposits with banks	6,871	11,810
Federal funds sold and securities purchased under resale agreements	80,772	73,111
Trading account assets	20,002	13,863
Mortgage loans held for sale	89,245	63,328
Other loans held for sale	1,082	3,606
Investment securities available for sale	3,130,041	3,041,406
Private equity investments	28,126	28,362
Mutual funds held in Rabbi Trusts	11,384	11,252
Loans, net	21,106,213	21,097,699
Derivative asset positions	35,494	32,117
Trading account liabilities	1,575	2,100
Non-interest bearing deposits	6,251,393	6,228,472
Interest bearing deposits	15,856,456	15,303,228
Federal funds purchased and securities sold under repurchase agreements	125,323	126,916
Salary stock units		1,206
Long-term debt	2,189,769	2,140,319
Derivative liability positions	36,030	33,553
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	429,338	485,489
Interest bearing funds with Federal Reserve Bank	1,263,886	721,362
Interest earning deposits with banks	6,871	11,810
Federal funds sold and securities purchased under resale agreements	80,772	73,111
Trading account assets	20,002	13,863
Mortgage loans held for sale	89,245	63,328
Other loans held for sale	1,082	3,606
Investment securities available for sale	3,130,041	3,041,406
Private equity investments	28,126	28,362
Mutual funds held in Rabbi Trusts	11,384	11,252
Loans, net	20,877,101	20,872,939
Derivative asset positions	35,494	32,117
Trading account liabilities	1,575	2,100
Non-interest bearing deposits	6,251,393	6,228,472
Interest bearing deposits	15,848,697	15,299,372
Federal funds purchased and securities sold under repurchase agreements	125,323	126,916
Salary stock units		1,206
Long-term debt	2,243,405	2,191,279
Derivative liability positions	$36,030	$33,553

Derivative_Instruments_Narrati

Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
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	-1,000,000		-1,100,000
Remaining deferred gain (loss) balance on all previously terminated fair value hedges	6,800,000		7,600,000
Deferred gain balance on terminated fair value hedges expected to be reclassified from long-term debt	3,100,000
Derivative, fair value	1,400,000
Gain (loss) on sale of outstanding commitments	5,000	-969,000
Deferred gains (loss) on discontinuation of cash flow hedge reclassified to earnings	774,000	914,000
Fixed Rate Residential Mortgage [Member]
Derivative [Line Items]
Commitments to fund fixed-rate mortgage loans	125,500,000		73,400,000
Unrealized gain on fair value of fixed-rate mortgage loans to customers	1,100,000	649,000
Sale of outstanding commitments	170,500,000		113,000,000
Interest Rate Swap [Member] | Customer Related Interest Rate Risk [Member]
Derivative [Line Items]
Notional amount of interest rate swap contracts	1,110,000,000		20,600,000
Federal Funds Sold [Member]
Derivative [Line Items]
Federal funds sold	67,500,000
Federal Funds Sold, Counterparty with CCC [Member]
Derivative [Line Items]
Federal funds sold	$7,600,000

Derivative_Instruments_Impact_

Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) (Not Designated As Hedging Instruments [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Other Assets [Member]
Derivative [Line Items]
Fair value of derivative assets	$35,494	$32,117
Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative assets	33,183	30,904
Other Assets [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets	2,311	1,213
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	36,030	33,552
Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative liabilities	33,856	31,398
Other Liabilities [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative liabilities	749	753
Other Liabilities [Member] | Visa Derivative[Member]
Derivative [Line Items]
Fair value of derivative liabilities	$1,425	$1,401

Derivative_Instruments_Effect_

Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) (Not Designated As Hedging Instruments [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$923		($216)
Other Non-Interest Income [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	-179	[1]	104	[1]
Mortgage Banking Income [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$1,102	[2]	($320)	[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
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Basic Earnings (Loss) Per Share
Net income available to common shareholders	$51,404	$45,857
Weighted average common shares outstanding	134,933	138,932
Net income per common share, basic	$0.38	$0.33
Diluted Earnings (Loss) Per Share
Net income available to common shareholders	$51,404	$45,857
Weighted average common shares outstanding	134,933	138,932
Potentially dilutive shares from assumed exercise of securities or other contracts to purchase common stock	811	572
Weighted average number of diluted common shares	135,744	139,504
Net income per common share, diluted	$0.38	$0.33

Net_Income_Per_Common_Share_Na

Net Income Per Common Share (Narrative) (Details)	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Apr. 24, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Stock split, conversion ratio	0.1429
Potentially dilutive shares		3.1	3.5

Sharebased_Compensation_Detail

Share-based Compensation (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$3.20	$2.20
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other equity compensation, shares granted	0
Options outstanding	2,361,598
Weighted-average exercise price, options	$45.13
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Other equity compensation, shares granted	291,754
Weighted-average exercise price, shares granted during period	$28.30
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other equity compensation, shares granted	82,152
Market Restricted Stock Units (MRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other equity compensation, shares granted	82,152
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	1,099,065
Weighted-average exercise price, non-vested shares outstanding	$24.80
Minimum [Member] | Performance Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on return on average assets (ROAA)			0.00%
Minimum [Member] | Market Restricted Stock Units (MRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on shareholder return			75.00%
Maximum [Member] | Performance Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on return on average assets (ROAA)			150.00%
Maximum [Member] | Market Restricted Stock Units (MRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on shareholder return			125.00%
2013 Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equivalents authorized	6,696,079
Shares of authorized but unissued common stock reserved for future grants	8,571,429
Contractual term (years)	10 years
2013 Omnibus Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share equivalents ratio	1
2013 Omnibus Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
2013 Omnibus Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years

Legal_Proceedings_Details

Legal Proceedings (Details) (USD $)	0 Months Ended
	Aug. 23, 2014	Mar. 31, 2015
Loss Contingencies [Line Items]
Aggregate range of reasonably possible losses, minimum		$0
Aggregate range of reasonably possible losses, maximum		15,000,000
Posting Order Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement amount	-3,750,000
Litigation settlement expenses	$150,000