Synovus Financial (SNV) 10-K 27 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 24, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	SYNOVUS FINANCIAL CORP
Entity Central Index Key	18,349
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		122,349,767
Trading Symbol	snv
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,372,136,919

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 395,175	$ 367,092
Interest bearing funds with Federal Reserve Bank	527,090	829,887
Interest earning deposits with banks	18,720	17,387
Federal funds sold and securities purchased under resale agreements	58,060	69,819
Trading account assets, at fair value	9,314	5,097
Mortgage loans held for sale, at fair value	51,545	59,275
Investment securities available for sale, at fair value	3,718,195	3,587,818
Loans, net of deferred fees and costs	23,856,391	22,429,565
Allowance for loan losses	(251,758)	(252,496)
Loans, net	23,604,633	22,177,069
Premises and equipment, net	417,485	445,155
Goodwill	59,678	24,431
Other intangible assets	13,223	471
Other real estate	22,308	47,030
Deferred tax asset, net	395,356	511,948
Other assets	813,220	650,174
Total assets	30,104,002	28,792,653
Liabilities
Non-interest bearing deposits	7,085,804	6,732,970
Interest bearing deposits, excluding brokered deposits	16,183,273	15,434,171
Brokered deposits	1,378,983	1,075,520
Total deposits	24,648,060	23,242,661
Federal funds purchased and securities sold under repurchase agreements	159,699	177,025
Long-term debt	2,160,881	2,186,893
Other liabilities	207,438	185,878
Total liabilities	27,176,078	25,792,457
Shareholders' Equity
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at December 31, 2016 and December 31, 2015	125,980	125,980
Common stock - $1.00 par value. Authorized 342,857,143 shares at December 31, 2016 and December 31, 2015; issued 142,025,720 at December 31, 2016 and 140,592,409 at December 31, 2015; outstanding 122,266,106 at December 31, 2016 and 129,547,032 at December 31, 2015	142,026	140,592
Additional paid-in capital	3,028,405	2,989,981
Treasury stock, at cost – 19,759,614 shares at December 31, 2016 and 11,045,377 shares at December 31, 2015	(664,595)	(401,511)
Accumulated other comprehensive loss, net	(55,659)	(29,819)
Retained earnings	351,767	174,973
Total shareholders’ equity	2,927,924	3,000,196
Total liabilities and shareholders' equity	$ 30,104,002	$ 28,792,653

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
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 (in shares)	142,025,720	140,592,409
Common stock, shares outstanding	122,266,106	129,547,032
Treasury stock, shares at cost	19,759,614	11,045,377

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Loans, including fees	$ 944,233	$ 877,384	$ 862,916
Investment securities available for sale	67,467	59,154	57,832
Trading account assets	91	303	456
Mortgage loans held for sale	2,646	2,546	2,304
Federal Reserve Bank balances	4,356	3,144	2,081
Other earning assets	4,010	3,431	3,103
Total interest income	1,022,803	945,962	928,692
Interest expense:
Deposits	64,206	65,534	55,179
Federal funds purchased and securities sold under repurchase agreements	200	168	220
Long-term debt	59,217	52,942	54,009
Total interest expense	123,623	118,644	109,408
Net interest income	899,180	827,318	819,284
Provision for loan losses	28,000	19,010	33,831
Net interest income after provision for loan losses	871,180	808,308	785,453
Non-interest income:
Service charges on deposit accounts	81,425	80,142	78,897
Fiduciary and asset management fees	46,594	45,928	45,226
Brokerage revenue	27,028	27,855	27,088
Mortgage banking income	24,259	24,096	18,354
Bankcard fees	33,318	33,172	32,931
Investment securities gains, net	6,011	2,769	1,331
Other fee income	20,220	21,170	19,130
Gain on sale of Memphis branches, net	0	0	5,789
Other non-interest income	34,339	32,788	33,358
Total non-interest income	273,194	267,920	262,104
Non-interest expense:
Salaries and other personnel expense	402,026	380,918	371,904
Net occupancy and equipment expense	109,347	107,466	105,806
Third-party processing expense	46,320	42,851	40,042
FDIC insurance and other regulatory fees	26,714	27,091	33,485
Professional fees	26,698	26,646	26,440
Advertising expense	20,264	15,477	24,037
Foreclosed real estate expense, net	12,838	22,803	25,321
Fair value adjustment to Visa derivative	5,795	1,464	3,041
Loss on early extinguishment of debt, net	4,735	1,533	0
Merger-related expense	1,636	0	0
Restructuring charges	8,267	36	20,585
Other operating expenses	91,283	91,370	94,337
Total non-interest expense	755,923	717,655	744,998
Income before income taxes	388,451	358,573	302,559
Income tax expense	(141,667)	(132,491)	(107,310)
Net income	246,784	226,082	195,249
Dividends on preferred stock	10,238	10,238	10,238
Net income available to common shareholders	$ 236,546	$ 215,844	$ 185,011
Net income per common share, basic (per share)	$ 1.90	$ 1.63	$ 1.34
Net income per common share, diluted (per share)	$ 1.89	$ 1.62	$ 1.33
Weighted average common shares outstanding, basic	124,389	132,423	138,495
Weighted average common shares outstanding, diluted	125,078	133,201	139,154

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income, Before-tax Amount	$ 388,451	$ 358,573	$ 302,559
Net income, Tax (Expense) Benefit	(141,667)	(132,491)	(107,310)
Net income	246,784	226,082	195,249
Net change related to cash flow hedges: Before-tax Amount
Reclassification adjustment for losses realized in net income, Before-tax Amount	467	521	448
Net change related to cash flow hedges: Tax (Expense) Benefit
Reclassification adjustment for losses realized in net income, Tax (Expense) Benefit	(180)	(201)	(173)
Net change related to cash flow hedges: Net of Tax Amount
Reclassification adjustment for losses realized in net income, Net of Tax Amount	287	320	275
Net unrealized gains (losses) on investment securities available for sale: Before-tax Amount
Reclassification adjustment for net gains realized in net income, Before-tax Amount	(6,011)	(2,769)	(1,331)
Net unrealized (losses) gains arising during the period, Before-tax Amount	(36,432)	(25,707)	47,223
Net unrealized gains (losses), Before-tax Amount	(42,443)	(28,476)	45,892
Net unrealized gains (losses) on investment securities available for sale: Tax (Expense) Benefit
Reclassification adjustment for net gains realized in net income, Tax (Expense) Benefit	2,314	1,066	513
Net unrealized (losses) gains arising during the period, Tax (Expense) Benefit	14,027	9,901	(18,182)
Net unrealized gains (losses), Tax (Expense) Benefit	16,341	10,967	(17,669)
Net unrealized gains (losses) on investment securities available for sale: Net of Tax Amount
Reclassification adjustment for net gains realized in net income, Net of Tax Amount	(3,697)	(1,703)	(818)
Net unrealized (losses) gains arising during the period, Net of Tax Amount	(22,405)	(15,806)	29,041
Net unrealized gains (losses), Net of Tax Amount	(26,102)	(17,509)	28,223
Post-retirement unfunded health benefit: Before-tax Amount
Reclassification adjustment for gains realized in net income, Before-tax Amount	(144)	(272)	(144)
Actuarial gains arising during the period, Before-tax Amount	102	236	395
Net unrealized (losses) gains, Before-tax Amount	(42)	(36)	251
Post-retirement unfunded health benefit: Tax (Expense) Benefit
Reclassification adjustment for gains realized in net income, Tax (Expense) Benefit	56	104	56
Actuarial gains arising during the period, Tax (Expense) Benefit	(39)	(93)	(152)
Net unrealized (losses) gains, Tax (Expense) Benefit	17	11	(96)
Post-retirement unfunded health benefit: Net of Tax Amount
Reclassification adjustment for gains realized in net income, Net of Tax Amount	(88)	(168)	(88)
Actuarial gains arising during the period, Net of Tax Amount	63	143	243
Net unrealized (losses) gains, Net of Tax Amount	(25)	(25)	155
Other comprehensive (loss) income, Before-tax Amount	(42,018)	(27,991)	46,591
Other comprehensive (loss) income, Tax (Expense) Benefit	16,178	10,777	(17,938)
Other comprehensive (loss) income, Net of Tax Amount	(25,840)	(17,214)	28,653
Comprehensive income, Net of Tax Amount	$ 220,944	$ 208,868	$ 223,902

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Series C Preferred Stock [Member]	Preferred Stock [Member]Series C Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Series C Preferred Stock [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Retained Earnings [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	195,249								195,249
Other comprehensive (loss) income, Net of Tax Amount	28,653							28,653
Cash dividends declared on common stock	(42,805)								(42,805)
Cash dividends paid on Series C Preferred Stock		$ (10,238)				$ (10,238)
Repurchases of common stock	(88,113)				(14,515)		(73,598)
Issuance of common stock, net of issuance costs		118	118
Restricted share unit activity	(692)			52	(706)				(38)
Stock options exercised	3,048			177	2,871
Share-based compensation tax benefit (deficiency)	(3,168)				(3,168)
Share-based compensation expense	10,233				10,233
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	226,082								226,082
Other comprehensive (loss) income, Net of Tax Amount	(17,214)							(17,214)
Cash dividends declared on common stock	(55,354)								(55,354)
Cash dividends paid on Series C Preferred Stock		(10,238)				$ 0				$ (10,238)
Repurchases of common stock	(199,221)				14,516		(213,737)
Restricted share unit activity	(4,984)			304	(4,877)				(411)
Stock options exercised	5,643			338	5,305
Share-based compensation tax benefit (deficiency)	1,656				1,656
Share-based compensation expense	12,556				12,556
Balance at Dec. 31, 2015	3,000,196		125,980	140,592	2,989,981		(401,511)	(29,819)	174,973
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	246,784								246,784
Other comprehensive (loss) income, Net of Tax Amount	(25,840)							(25,840)
Cash dividends declared on common stock	(59,425)								(59,425)
Cash dividends paid on Series C Preferred Stock		$ (10,238)								$ (10,238)
Repurchases of common stock	(263,084)						(263,084)
Issuance of common stock for acquisition	26,592			821	25,771
Restricted share unit activity	(5,041)			316	(5,030)				(327)
Stock options exercised	5,155			297	4,858
Share-based compensation tax benefit (deficiency)	(790)				(790)
Share-based compensation expense	13,615				13,615
Balance at Dec. 31, 2016	$ 2,927,924		$ 125,980	$ 142,026	$ 3,028,405		$ (664,595)	$ (55,659)	$ 351,767

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.48	$ 0.42	$ 0.31

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 246,784	$ 226,082	$ 195,249
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	28,000	19,010	33,831
Depreciation, amortization, and accretion, net	58,228	56,741	54,952
Deferred income tax expense	128,837	121,904	102,020
(Increase) decrease in trading account assets	(2,327)	8,766	(7,750)
Originations of mortgage loans held for sale	(705,394)	(790,625)	(766,815)
Proceeds from sales of mortgage loans held for sale	724,712	807,906	761,979
Gain on sales of mortgage loans held for sale, net	(13,780)	(14,966)	(12,357)
(Increase) decrease in other assets	(23,568)	7,799	2,258
Decrease in other liabilities	(4,239)	(24,906)	(8,990)
Investment securities gains, net	(6,011)	(2,769)	(1,331)
Losses and write-downs on other real estate, net	10,174	17,619	22,085
Losses and write-downs on other assets held for sale, net	8,001	892	7,643
Loss on early extinguishment of debt, net	4,735	1,533	0
Share-based compensation expense	13,615	12,556	10,233
Gain on sale of Memphis branches, net	0	0	(5,789)
Net cash provided by operating activities	467,767	447,542	387,218
Investing Activities
Net cash received (used) in acquisitions/dispositions	6,146	0	(90,571)
Net (increase) decrease in interest earning deposits with banks	(1,335)	(5,577)	12,515
Net decrease in federal funds sold and securities purchased under resale agreements	11,759	3,291	7,864
Net decrease (increase) in interest bearing funds with Federal Reserve Bank	302,797	(108,525)	(76,834)
Proceeds from maturities and principal collections of investment securities available for sale	894,123	693,608	568,918
Proceeds from sales of investment securities available for sale	968,606	347,954	20,815
Purchases of investment securities available for sale	(2,051,283)	(1,634,531)	(378,919)
Proceeds from sales of loans	15,046	28,762	65,205
Proceeds from sale of other real estate	30,762	47,137	63,768
Net increase in loans	(1,129,422)	(1,411,050)	(1,326,596)
Purchase of Federal Reserve Bank capital stock	(97,293)	0	0
Purchase of bank-owned life insurance policies	(34,256)	(45,000)	0
Net increase in premises and equipment	(34,317)	(28,381)	(38,680)
Proceeds from sale of other assets held for sale	13,072	3,039	5,741
Net cash used in investing activities	(1,105,595)	(2,109,273)	(1,166,774)
Financing Activities
Net increase in demand and savings deposits	1,512,451	2,274,949	562,669
Net (decrease) increase in certificates of deposit	(107,893)	(565,315)	283,543
Net (decrease) increase in federal funds purchased and securities sold under repurchase agreements	(17,326)	50,109	(21,216)
Repayments on long-term debt	(2,263,688)	(823,899)	(400,781)
Proceeds from issuance of long-term debt	1,875,000	871,644	510,000
Dividends paid to common shareholders	(59,425)	(55,354)	(42,805)
Dividends paid to preferred shareholders	(10,238)	(10,238)	(10,238)
Stock options exercised	5,155	5,643	3,048
Repurchases and agreements to repurchase shares of common stock	(263,084)	(199,221)	(88,113)
Restricted stock activity	(5,041)	(4,984)	(692)
Net cash provided by financing activities	665,911	1,543,334	795,415
Increase (decrease) in cash and cash equivalents	28,083	(118,397)	15,859
Cash and cash equivalents at beginning of year	367,092	485,489	469,630
Cash and cash equivalents at end of year	395,175	367,092	485,489
Supplemental Cash Flow Information
Income tax payments, net	9,340	10,514	5,971
Interest paid	123,560	115,795	109,549
Non-cash Activities:
Mortgage loans held for sale transferred to loans at fair value	313	659	334
Loans foreclosed and transferred to other real estate	16,214	26,313	58,556
Premises and equipment transferred to other properties held for sale	25,231	2,340	16,613
Investment securities available for sale transferred to trading account assets at fair value	1,890	0	0
Securities purchased during the period but settled after period-end	0	0	25,938
Dispositions/Acquisitions:
Fair value of non-cash assets acquired (sold)	408,054	0	(100,982)
Fair value of liabilities assumed (sold)	387,608	0	(191,553)
Fair value of common stock issued	$ 26,592	$ 0	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 - Summary of Significant Accounting Policies Business Operations The 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 accounting and financial reporting policies of Synovus are in accordance with U.S. GAAP and conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. All significant intercompany accounts and transactions have been eliminated in consolidation. In preparing the consolidated financial statements in accordance with U.S. 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 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. In connection with the determination of the allowance for loan losses and the valuation of certain impaired loans, management obtains independent appraisals for significant properties and properties collateralizing impaired loans. In making this determination, management also considers other factors or recent developments, such as changes in absorption rates or market conditions at the time of valuation and anticipated sales values based on management’s plans for disposition. The following is a description of the Company's significant accounting policies. Cash and Cash Equivalents Cash and cash equivalents consist of cash and due from banks. At December 31, 2016 and 2015 , $533 thousand and $ 100 thousand , respectively, of the due from banks balance was restricted as to withdrawal. Short-term Investments Short-term investments consist of interest bearing funds with the Federal Reserve Bank, interest earning deposits with banks, and federal funds sold and securities purchased under resale agreements. At December 31, 2016 and 2015 , interest bearing funds with the Federal Reserve Bank included $130 million and $117.3 million , respectively, on deposit to meet Federal Reserve Bank reserve requirements. Interest earning deposits with banks include $5.6 million at December 31, 2016 and $2.2 million at December 31, 2015 , which is pledged as collateral in connection with certain letters of credit. Federal funds sold include $56.1 million at December 31, 2016 and $65.9 million at December 31, 2015 , 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. Trading Account Assets Trading account assets, which are primarily held on a short-term basis for the purpose of selling at a profit, consist of debt and equity securities and are reported at fair value. Fair value adjustments and fees from trading account activities are included as a component of other fee income on the consolidated statements of income. Gains and losses realized from the sale of trading account assets are determined by specific identification and are included as a component of other fee income on the trade date. Interest income on trading assets is reported as a component of interest income on the consolidated statements of income. Mortgage Loans Held for Sale and Mortgage Banking Income Mortgage Loans Held for Sale Mortgage loans held for sale are recorded at fair value. Fair value is derived from a hypothetical bulk sale model used to estimate the exit price of the loan in a loan sale. The bid pricing convention is used for loan pricing for similar assets. The valuation model is based upon forward settlements of a pool of loans of similar coupon, maturity, product, and credit attributes. The inputs to the model are continuously updated with available market and historical data. As the loans are sold in the secondary market, the valuation model produces an estimate of fair value that represents the highest and best use of the loans in Synovus' principal market. Mortgage Banking Income Mortgage banking income consists primarily of origination and ancillary fees on loans originated for sale, and gains and losses from the sale of mortgage loans. Mortgage loans are generally sold servicing released, without recourse or continuing involvement, and meet ASC 860-10-65 criteria for sale accounting. Other Loans Held for Sale Loans are transferred to other loans held for sale at fair value when Synovus makes the determination to sell specifically identified loans. The fair value of the loans is primarily determined by analyzing the underlying collateral of the loan and the anticipated market prices of similar assets less estimated costs to sell. At the time of transfer, if the estimated fair value is less than the carrying amount, the difference is recorded as a charge-off against the allowance for loan losses. Decreases in the fair value subsequent to the transfer, as well as gains/losses realized from the sale of these assets, are recorded as losses on other loans held for sale, net, as a component of non-interest expense on the consolidated statements of income. Investment Securities Available for Sale Investment securities available for sale are carried at fair value with unrealized gains and losses, net of the related tax effect, excluded from earnings and reported as a separate component of shareholders' equity within accumulated other comprehensive income (loss) until realized. Synovus performs a quarterly assessment of its investment securities available for sale to determine if the decline in fair value of a security below its amortized cost is deemed to be other-than-temporary. Factors included in the assessment 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. Other-than-temporary impairment losses are recognized on securities when: (1) the holder has an intention to sell the security; (2) it is more likely than not that the security will be required to be sold prior to recovery; or (3) the holder does not expect to recover the entire amortized cost basis of the security. Other-than-temporary impairment losses 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 (loss). Premiums and discounts are amortized or accreted over the life of the related security as an adjustment to yield using the effective interest method and prepayment assumptions. Actual prepayment experience is reviewed periodically and the timing of the accretion and amortization is adjusted accordingly. Interest income on securities available for sale is recorded on the accrual basis. Realized gains and losses for securities are included in investment securities gains (losses), net, on the consolidated statements of income and are derived using the specific identification method, on a trade date basis. Loans and Interest Income on Loans Loans are reported at principal amounts outstanding less amounts charged off, net of deferred fees and expenses. Interest income and deferred fees, net of expenses on loans, are recognized on a level yield basis. Non-accrual Loans Loans on which the accrual of interest has been discontinued are designated as non-accrual loans. Accrual of interest is discontinued on loans when reasonable doubt exists as to the full collection of interest or principal, or when loans become contractually past due for 90 days or more as to either interest or principal, in accordance with the terms of the loan agreement, unless they are both well-secured and in the process of collection. When a loan is placed on non-accrual status, previously accrued and uncollected interest is generally reversed as an adjustment to interest income on loans. Interest payments received on non-accrual loans are generally recorded as a reduction of principal. As payments are received on non-accruing loans, interest income can be recognized on a cash basis; however, there must be an expectation of full repayment of the remaining recorded principal balance. The remaining portion of this payment is recorded as a reduction to principal. Loans are generally returned to accruing status when they are brought fully current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to both principal and interest, and the borrower has sustained repayment performance under the terms of the loan agreement for a reasonable period of time (generally six months). Impaired Loans Impaired loans are loans for which it is probable that Synovus will not be able to collect all amounts due according to the contractual terms of the loan agreements and all loans modified in a troubled debt restructuring (TDR). Other than TDRs, impaired loans do not include smaller-balance homogeneous loans that are collectively evaluated for impairment, which consist of most retail loans and commercial loan relationships less than $1.0 million . Impairment is measured on a discounted cash flow method based upon the loan's contractual effective interest rate, or at the loan's observable market price, or at the fair value of the collateral, less costs to sell if the loan is collateral-dependent. Interest income on non-accrual impaired loans is recognized as described above under "non-accrual loans." Impaired accruing loans generally consist of those TDRs for which management has concluded that the collectability of the loan is not in doubt. At December 31, 2016 , substantially all non-accrual impaired loans were collateral-dependent and secured by real estate. For impairment measured using the estimated fair value of collateral less costs to sell, fair value is estimated using appraisals performed by a certified or licensed appraiser. Management also considers other factors or recent developments, such as selling costs and anticipated sales values, taking into account management's plans for disposition, which could result in adjustments to the fair value estimates indicated in the appraisals. The assumptions used in determining the amount of the impairment are subject to significant judgment. Use of different assumptions, for example, changes in the fair value of the collateral or management's plans for disposition could have a significant impact on the amount of impairment. Under the discounted cash flow method, impairment is recorded as a specific reserve with a charge-off for any portion of the impairment considered a confirmed loss. The reserve is reassessed each quarter and adjusted as appropriate based on changes in estimated cash flows. Where guarantors are determined to be a source of repayment, an assessment of the guarantee is required. This guarantee assessment would include, but not be limited to, factors such as type and feature of the guarantee, consideration for the guarantor's financial strength and capacity to service the loan in combination with the guarantor's other financial obligations as well as the guarantor's willingness to assist in servicing the loan. Troubled Debt Restructurings When borrowers are experiencing financial difficulties, Synovus may, in order to assist the borrowers in repaying the principal and interest owed to Synovus, make certain modifications to the borrower's loan. All loan modifications, renewals, and refinances are evaluated for TDR classification. All TDRs are considered to be impaired loans, and the amount of impairment, if any, is determined in accordance with ASC 310-10-35 . Concessions provided by Synovus in a TDR are generally made in order to assist borrowers so that debt service is not interrupted and to mitigate the potential for loan losses. A number of factors are reviewed when a loan is renewed, refinanced, or modified, including cash flows, collateral values, guarantees, and loan structures. Concessions are primarily in the form of providing a below market interest rate given the borrower's credit risk to assist the borrower in managing cash flows, an extension of the maturity of the loan generally for less than one year, or 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). Insignificant periods of reduction of principal and/or interest payments, or one time deferrals of three months or less, are generally not considered to be financial concessions. Further, it is generally Synovus' practice not to defer principal and/or interest for more than twelve months. Non-accruing TDRs may generally be returned to accrual status if there has been a period of performance, usually at least a six month sustained period of repayment performance in accordance with the agreement. Consistent with regulatory guidance, a TDR will generally no longer be reported as a TDR after a period of performance and after the loan was reported as a TDR at a year-end reporting date, and if at the time of the modification, the interest rate was at market, considering the credit risk associated with the borrower, and no principal was forgiven. Allowance for Loan Losses The allowance for loan losses represents management's best estimate of probable losses inherent in the funded loan porfolio. Changes to the allowance are recorded through a provision for loan losses and reduced by loans charged-off, net of recoveries. Impaired loans are generally evaluated on a loan by loan basis with specific reserves, if any, recorded as appropriate. Specific reserves are determined based on ASC 310-10-35, which provides for measurement of a loan's impairment based on one of three methods. If the loan is collateral-dependent, then the fair value of the loan's collateral, less estimated selling costs, are compared to the loan's carrying amount to determine impairment. Other methods of measuring a loan's impairment include the present value of the expected future cash flows of the loan, or if available, the observable market price of the loan. Synovus considers the pertinent facts and circumstances for each impaired loan when selecting the appropriate method to measure impairment, and quarterly evaluates each selection to ensure its continued appropriateness and evaluates the reasonableness of specific reserves, if any. For loans that are not considered impaired, the allocated allowance for loan losses is determined based upon Expected Loss (EL) factors, which are applied to groupings of specific loan types by loan risk ratings. The EL is determined based upon a probability of default (PD), which is the probability that a borrower, segregated by loan type and loan risk grade, will default, and loss given default (LGD), which is the estimate of the amount of net loss in the event of default. The groupings of the loans into loan categories are determined based upon the nature of the loan types and the level of inherent risk associated with the various loan categories. The loan groupings are further segregated based upon the individual loan risk ratings, as described below. The EL factors applied in the methodology are periodically re-evaluated and adjusted to reflect changes in historical loss levels or other risks. Allocated EL factors may also be adjusted, as necessary, for certain qualitative factors that in management's judgment are necessary to reflect losses incurred in the portfolio. Qualitative factors that management considers in the analysis include: • changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses • changes in the volume and severity of past due loans, the volume of non-accrual loans, and the volume and severity of adversely classified or grade loans • loan growth • effects of changes in credit concentrations • experience, ability, and depth of lending management, loan review personnel, and other relevant staff • changes in the quality of the loan review function • national and local economic trends and conditions • value of underlying collateral for collateral-dependent loans • other external factors such as the effects for the current competitive, legal, and regulatory environment The adjusted EL factors by portfolio are then adjusted by a loss emergence period for each loan type. A loss emergence period represents the amount of time between when a loss event first occurs to when it is charged off. The loss emergence period was determined for each loan type based on the Company's historical experience and is validated at least annually. Commercial Loans - Risk Ratings Synovus utilizes two primary methods for risk assessment of the commercial loan portfolio: Single Risk Rating Assessment and Dual Risk Rating (DRR) Assessment. The single and dual risk ratings are based on the borrowers' credit risk profile, considering factors such as debt service history, current and estimated prospective cash flow information, collateral supporting the credit, source of repayment as well as other variables, as appropriate. Each loan is assigned a risk rating during its initial approval process. For single risk rated loans, this process begins with a loan rating recommendation from the loan officer responsible for originating the loan. Commercial single risk rated loans are graded on a 9-point scale. Single risk ratings six through nine are defined consistent with the bank regulatory classifications of special mention, substandard, doubtful, and loss, respectively. The primary determinants of the risk ratings for commercial single risk rated loans are the reliability of the primary source of repayment and the borrower's expected performance (i.e., the likelihood that the borrower will be able to service its obligations in accordance with the terms). Expected performance will be based upon full analysis of the borrower's historical financial results, current financial strength and future prospects, which includes any external drivers. For dual risk rated loans, this process begins with scoring the loan for a rating during its initial approval process. Synovus began utilizing a dual risk rating methodology for certain components of its C&I loan portfolio in 2013 and extended the DRR methodology to certain income-producing real estate loans in 2014 and 2015. The DRR includes sixteen PD categories and nine categories for estimating losses given an event of default. The result is an EL rate established for each borrower. The loan rating is subject to approvals from other members of management, regional credit and/or loan committees depending on the size of the loan and loan's credit attributes. Loan ratings are regularly re-evaluated based upon annual scheduled credit reviews or on a more frequent basis if determined prudent by management. Additionally, an independent loan review function evaluates Synovus' risk rating processes on a continuous basis. Management continues to implement the DRR methodology for additional components of the commercial loan portfolio. The timing of future implementations will depend upon completion of applicable data analysis and model assessment. Approximately $7.6 billion , or 31.8% , of the total loan portfolio was rated using the DRR methodology at year-end 2016. Retail Loans – Risk Ratings Retail loans are generally assigned a risk rating on a 6-point scale at the time of origination based on credit bureau scores, with a loan grade of 1 assigned as the lowest level of risk and a loan grade of 6 as the highest level of risk. At 90-119 days past due, a loan grade of 7-substandard rating is applied and at 120 days past due, the loan is generally downgraded to grade 9-loss and is generally charged-off. The credit bureau-based ratings are updated at least semi-annually and the ratings based on the past due status are updated monthly. Unallocated Allowance for Loan Losses The unallocated component of the allowance for loan losses is not a significant component of the ALLL, but would be utilized to provide for certain environmental and economic factors that affect the inherent risk of loss in the entire loan portfolio that are not fully captured in the allocated allowance for loan losses. On a quarterly basis, management updates its analysis and consideration of these factors and determines the impact, if any, on the allowance for loan losses and the provision for loan losses for each respective period. Premises and Equipment Premises and equipment, including bank owned branch locations and leasehold improvements, are reported at cost, less accumulated depreciation and amortization, which are computed using the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are depreciated over the shorter of the estimated useful life or the remainder of the lease term. Synovus reviews long-lived assets, such as premises and equipment, for impairment whenever events and circumstances indicate that the carrying amount of an asset may not be recoverable. Goodwill and Other Intangible Assets Goodwill represents the excess purchase price over the fair value of identifiable net assets of acquired businesses. Goodwill is tested for impairment at the reporting unit level on an annual basis and as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. Synovus reviews goodwill for impairment as of June 30 th and at interim periods if indicators of impairment exist. Significant judgment is applied when goodwill is assessed for impairment. This judgment includes developing cash flow projections, selecting appropriate discount rates, identifying relevant market comparables, incorporating general economic and market conditions, and selecting an appropriate control premium. The selection and weighting of the various fair value techniques may result in a higher or lower fair value. Judgment is applied in determining the weighting that are most representative of fair value. Other intangible assets relate primarily to existing borrower relationships, trade name, and a distribution network resulting from a business acquisition. These intangible assets are amortized using straight line methods based on the remaining lives of the assets. Amortization periods range from eight to ten years. Amortization periods for intangible assets are monitored to determine if events and circumstances require such periods to be reduced. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of the intangible assets is measured by a comparison of the carrying amount of the asset to future undiscounted cash flows expected to be generated by the asset. If such assets are considered impaired, the amount of the impairment to be recognized is measured by the amount by which the carrying value of the assets exceeds the fair value of the assets based on the discounted expected future cash flows to be generated by the assets. Other Real Estate Other Real Estate (ORE) consists of properties obtained through a foreclosure proceeding or through an in-substance foreclosure in satisfaction of loans. A loan is classified as an in-substance foreclosure when Synovus has taken possession of the collateral regardless of whether formal foreclosure proceedings have taken place. At foreclosure, ORE is recorded at the lower of cost or fair value less estimated selling costs, which establishes a new cost basis. Subsequent to foreclosure, ORE is evaluated quarterly and reported at fair value less estimated selling costs, not to exceed the new cost basis, determined by review of current appraisals, as well as the review of comparable sales and other estimates of fair value obtained principally from independent sources, adjusted for estimated selling costs. Management also considers other factors or recent developments such as changes in absorption rates or market conditions from the time of the latest appraisal received or previous re-evaluation performed, and anticipated sales values considering management's plans for disposition, which could result in an adjustment to lower the fair value estimates indicated in the appraisals. At the time of foreclosure or initial possession of collateral, any excess of the loan balance over the fair value of the real estate held as collateral, less costs to sell, is recorded as a charge against the allowance for loan losses. Revenue and expenses from ORE operations as well as gains or losses on sales are recorded as foreclosed real estate expense, net, a component of non-interest expense on the consolidated statements of income. Subsequent declines in fair value are recorded on a property-by-property basis through use of a valuation allowance within ORE on the consolidated balance sheets and valuation adjustment account in foreclosed real estate expense, net, a component of non-interest expense on the consolidated statements of income. Synovus' objective is to dispose of ORE properties in a timely manner and to maximize net sale proceeds. Synovus has a centralized managed assets division, with the specialized skill set to facilitate this objective. While there is not a defined timeline for their sale, ORE properties are actively marketed through unaffiliated third parties. Other Assets Other assets include accrued interest receivable and other significant balances as described below. Cash Surrender Value of Bank-Owned Life Insurance Investments in bank-owned life insurance policies on certain current and former officers of Synovus are recorded at the net realizable value of the policies. Net realizable value is the cash surrender value of the policies less any applicable surrender charges and any policy loans. Synovus has not borrowed against the cash surrender value of these policies. Changes in the cash surrender value of the policies are recognized as a component of other non-interest income in the consolidated statements of income. Investments in Federal Reserve Bank and Federal Reserve Home Loan Bank Stock On November 17, 2016, Synovus Bank made an investment of $97.3 million in Federal Reserve Bank capital stock and became a member of the Federal Reserve System. Synovus held stock in the Federal Reserve Bank totaling $98.6 million at December 31, 2016 and $1.2 million at December 31, 2015 . Synovus also held stock in the FHLB of Atlanta totaling $71.3 million at December 31, 2016 and $67.1 million at December 31, 2015 . The Federal Reserve Bank and FHLB stocks are recorded at amortized cost. The investment in FHLB stock is required for membership in the FHLB system and in relation to the level of FHLB outstanding borrowings. SBA/Government Guaranteed Loans (GGL) Servicing Assets, net Synovus has retained servicing responsibilities on sold SBA/GGL loans and receives annual servicing fees on the outstanding loan balances. SBA/GGL servicing rights are accounted for using the amortization method. A servicing asset is established at fair value at the time of the sale using a discounted future cash flow model. The servicing asset is then amortized in other non-interest expense. Private Equity Investments Private equity investments are recorded at fair value on the consolidated balance sheets with realized and unrealized gains and losses recorded on the consolidated statements of income (as a component of other non-interest income). The private equity investments in which Synovus holds a limited partner interest consist of funds that invest in privately held companies. For privately held companies in the fund, the general partner estimates the fair value of the company. The estimated fair value of the company is the estimated fair value as an exit price the fund would receive if it were to sell the company in the marketplace. The fair value of the fund's underlying investments is estimated through the use of valuation models, such as option pricing or a discounted cash flow model. Valuation factors, such as a company's financial performance against budget or milestones, last price paid by investors, with consideration given on whether financing is provided by insiders or unrelated new investors, public market comparables, liquidity of the market, industry and economic trends, and changes in management or key personnel, are used in the determination of estimated fair value. Derivative Instruments Synovus’ risk management policies emphasize the management of interest rate risk within acceptable guidelines. Synovus’ objective in maintaining these policies is to limit volatility in net interest income arising from changes in interest rates. Risks to be managed include both fair value and cash flow risks. Utilization of derivative financial instruments provides a valuable tool to assist in the management of these risks. All derivative instruments are recorded on the consolidated balance sheets at their respective fair values, as components of other assets and other liabilities. The accounting for changes in fair value (i.e., unrealized gains or losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, on the reason for holding it. If certain conditions are met, entities may elect to designate a derivative instrument as a hedge of exposures to changes in fair values, cash flows, or foreign currencies. If the hedged exposure is a fair value exposure, the unrealized gain or loss on the derivative instrument is recognized in earnings in the period of change, together with the offsetting unrealized loss or gain on the hedged item attributable to the risk being hedged as a component of other non-interest income on the consolidated statements of income. If the hedged exposure is a cash flow exposure, the effective portion of the gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss), net of the tax impact, and subsequently reclassified into earnings when the hedged transaction affects earnings. Any amounts excluded from the assessment of hedge effectiveness, as well as the ineffective portion of the gain or loss on the derivative instrument, are reported in earnings immediately as a component of other non-interest income on the consolidated statements of income. If the derivative instrument is not designated as a hedge, the gain or loss on the derivative instrument is recognized in earnings as a component of other non-interest income on the consolidated statements of income in the period of change. In 2005, Synovus entered into certain forward starting swap contracts to hedge the cash flow risk of certain forecasted interest payments on a forecasted debt issuance. Upon the determination to issue debt, Synovus was potentially exposed to cash flow risk due to changes in market interest rates prior to the placement of the debt. The forward starting swaps allowed Synovus to hedge this exposure. Upon placement of the debt, these swaps were

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Acquisition	Note 2 - Acquisition On October 1, 2016, Synovus completed its acquisition of all of the outstanding stock of Global One. Global One is an Atlanta-based private specialty financial services company that lends primarily to commercial entities, with all loans fully collateralized by cash value life insurance policies and/or annuities issued by investment grade life insurance companies. Under the terms of the merger agreement, Synovus acquired Global One for an up-front payment of $30 million , consisting of the issuance of 821 thousand shares of Synovus common stock valued at $26.6 million and $3.4 million in cash, with additional payments to Global One's shareholders over the next three to five years based on earnings from the Global One business as further discussed below. The acquisition of Global One constituted a business combination. Accordingly, the assets acquired and liabilities assumed were recorded at their estimated fair values as shown in the table below. The determination of fair value required management to make estimates about discount rates, future expected earnings and cash flows, market conditions, future loan growth, and other future events that are highly subjective in nature and subject to change. These fair value estimates have been determined only provisionally, and are based on preliminary fair value estimates. Global One October 1, 2016 (in thousands) Preliminary Fair Value Assets acquired: Cash and due from banks $ 9,554 Commercial and industrial loans (1) 356,665 Goodwill (2) 35,247 Other intangible assets 13,400 Other assets 2,742 Total assets acquired $ 417,608 Liabilities assumed: Notes payable (3) $ 358,560 Contingent consideration 14,000 Deferred tax liability, net 3,145 Other liabilities 11,903 Total liabilities assumed $ 387,608 Consideration paid $ 30,000 Cash paid $ 3,408 Fair value of common stock issued 26,592 (1) The unpaid principal balance of the loans was $356.7 million . (2) The goodwill is not expected to be deductible for tax purposes. (3) The unpaid principal balance of the notes payable was $357.0 million . Under the terms of the merger agreement, the purchase price includes additional annual payments ("Earnout Payments") to Global One's former shareholders over the next three to five years, with amounts based on a percentage of net income attributable to "Global One Earnings," as defined in the merger agreement. The Earnout Payments will consist of shares of common stock as well as a smaller cash consideration component. The December 31, 2016 balance sheet reflects a provisional earnout liability of $14.0 million which represents management's preliminary estimate of the fair value of the Earnout Payments. Other intangible assets consist of existing borrower relationships, trade name, and distribution network. Refer to Note 9 - "Goodwill and Other Intangible Assets" of this Report for more information. Synovus' consolidated statement of income for the year ended December 31, 2016 includes the operating results produced by the acquired assets and assumed liabilities for the period of October 1, 2016 through December 31, 2016. The income statement impact was not significant. Additionally, Global One's historical results are not material to Synovus' results; accordingly, pro forma disclosures are not presented.

Sale of Branches

Sale of Branches	12 Months Ended
	Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Sale of Branches	Note 3 - 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 year ended December 31, 2014 reflect a pre-tax gain, net of associated costs, of $5.8 million relating to this transaction.

Restructuring Charges

Restructuring Charges	12 Months Ended
	Dec. 31, 2016
Restructuring Charges [Abstract]
Restructuring Charges	Note 4 - Restructuring Charges For the years ended December 31, 2016 , 2015 , and 2014 total restructuring charges consist of the following components: Years Ended December 31, (in thousands) 2016 2015 2014 Severance charges $ — — 7,246 Lease termination charges 6 (3 ) 4,808 Asset impairment charges 8,107 229 7,530 Gain on sale of assets held for sale, net — (401 ) (766 ) Professional fees and other charges 154 211 1,767 Total restructuring charges $ 8,267 36 20,585 For the year ended December 31, 2016, restructuring charges totaled $8.3 million with $5.3 million related to Synovus' continued corporate real estate optimization activities. Synovus continues to evaluate its branch network while deploying additional digital and on-line capabilities to increase convenience for customers while lowering transaction costs, and identified and closed nine branches during the year ended December 31, 2016. Asset impairment charges associated with branch closures identified during 2016 totaled $2.8 million . For the year ended December 31, 2015, Synovus recorded net gains of $401 thousand on the sale of certain branch locations and recorded additional expense, net of $437 thousand associated primarily with the 2014 branch closings. Restructuring charges for the year ended December 31, 2014 related primarily to expense savings initiatives that were approved during 2014. The initiatives included the consolidation or closing of certain branch locations as well as workforce reductions. Asset impairment and lease termination charges for the year ended December 31, 2014 consisted primarily of charges related to the closure of 13 branches during the fourth quarter of 2014. Severance charges for the year ended December 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 year ended December 31, 2014 consisted 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 the restructuring charges recorded during the years ended December 31, 2016, 2015, and 2014: (in thousands) Severance Charges Lease Termination Charges Total Balance at December 31, 2013 $ 1,572 1,383 2,955 Accruals for efficiency initiatives 7,246 4,808 12,054 Payments (5,527 ) (652 ) (6,179 ) Balance at December 31, 2014 3,291 5,539 8,830 Accruals for efficiency initiatives — (3 ) (3 ) Payments (1,361 ) (849 ) (2,210 ) Balance at December 31, 2015 1,930 4,687 6,617 Accruals for efficiency initiatives — 6 6 Payments (1,849 ) (725 ) (2,574 ) Balance at December 31, 2016 $ 81 3,968 4,049 All professional fees and other charges were paid in the years that they were incurred. No other restructuring charges resulted in payment accruals.

Investment Securities Available

Investment Securities Available for Sale	12 Months Ended
	Dec. 31, 2016
Investments [Abstract]
Investment Securities Available for Sale	Note 5 - Investment Securities Available for Sale The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities available for sale at December 31, 2016 and 2015 are summarized below. December 31, 2016 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 108,221 225 (644 ) 107,802 U.S. Government agency securities 12,727 266 — 12,993 Mortgage-backed securities issued by U.S. Government agencies 174,440 1,116 (1,354 ) 174,202 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,543,495 5,416 (42,571 ) 2,506,340 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 905,789 1,214 (16,561 ) 890,442 State and municipal securities 2,780 14 — 2,794 Equity securities 919 2,863 — 3,782 Other investments 20,247 — (407 ) 19,840 Total investment securities available for sale $ 3,768,618 11,114 (61,537 ) 3,718,195 December 31, 2015 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 43,125 232 — 43,357 U.S. Government agency securities 13,087 536 — 13,623 Securities issued by U.S. Government sponsored enterprises 126,520 389 — 126,909 Mortgage-backed securities issued by U.S. Government agencies 209,785 1,340 (1,121 ) 210,004 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,645,107 7,874 (22,562 ) 2,630,419 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 530,426 2,396 (3,225 ) 529,597 State and municipal securities 4,343 92 (1 ) 4,434 Equity securities 3,228 6,444 — 9,672 Other investments 20,177 — (374 ) 19,803 Total investment securities available for sale $ 3,595,798 19,303 (27,283 ) 3,587,818 At December 31, 2016 and 2015 , investment securities with a carrying value of $2.04 billion and $2.43 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 December 31, 2016 and 2015 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 earnings. 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 December 31, 2016 , Synovus had 88 investment securities in a loss position for less than twelve months and four 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 December 31, 2016 and December 31, 2015 are presented below. December 31, 2016 Less than 12 Months 12 Months or Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses U.S. Treasury securities 64,023 644 — — 64,023 644 Mortgage-backed securities issued by U.S. Government agencies 128,121 1,240 3,626 114 131,747 1,354 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,123,181 42,571 — — 2,123,181 42,571 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 682,492 15,653 24,801 908 707,293 16,561 Other investments 14,952 48 4,888 359 19,840 407 Total $ 3,012,769 60,156 33,315 1,381 3,046,084 61,537 December 31, 2015 Less than 12 Months 12 Months or Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Mortgage-backed securities issued by U.S. Government agencies 122,626 639 18,435 482 141,061 1,121 Mortgage-backed securities issued by U.S. Government sponsored enterprises 1,656,194 12,874 489,971 9,688 2,146,165 22,562 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 196,811 963 72,366 2,262 269,177 3,225 State and municipal securities — — 50 1 50 1 Other investments 14,985 15 4,818 359 19,803 374 Total $ 1,990,616 14,491 585,640 12,792 2,576,256 27,283 The amortized cost and fair value by contractual maturity of investment securities available for sale at December 31, 2016 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 December 31, 2016 (in thousands) Within One Year 1 to 5 Years 5 to 10 Years More Than 10 Years No Stated Maturity Total Amortized Cost U.S. Treasury securities $ 18,435 89,786 — — — 108,221 U.S. Government agency securities 999 5,929 5,799 — — 12,727 Mortgage-backed securities issued by U.S. Government agencies — — 14,345 160,095 — 174,440 Mortgage-backed securities issued by U.S. Government sponsored enterprises 154 86 624,561 1,918,694 — 2,543,495 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — — 905,789 — 905,789 State and municipal securities 110 240 — 2,430 — 2,780 Equity securities — — — — 919 919 Other investments — — 15,000 2,000 3,247 20,247 Total amortized cost $ 19,698 96,041 659,705 2,989,008 4,166 3,768,618 Fair Value U.S. Treasury securities $ 18,435 89,367 — — — 107,802 U.S. Government agency securities 1,021 6,019 5,953 — — 12,993 Mortgage-backed securities issued by U.S. Government agencies — — 14,784 159,418 — 174,202 Mortgage-backed securities issued by U.S. Government sponsored enterprises 158 88 624,216 1,881,878 — 2,506,340 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — — 890,442 — 890,442 State and municipal securities 110 240 — 2,444 — 2,794 Equity securities — — — — 3,782 3,782 Other investments — — 14,952 1,796 3,092 19,840 Total fair value $ 19,724 95,714 659,905 2,935,978 6,874 3,718,195 Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the years ended December 31, 2016 , 2015 and 2014 are presented below. OTTI charges of $88 thousand respectively, are included in gross realized losses for the year 2014 . The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale. (in thousands) 2016 2015 2014 Proceeds from sales of investment securities available for sale $ 968,606 347,954 20,815 Gross realized gains on sales (1) $ 9,586 $ 4,356 $ 1,419 Gross realized losses on sales (3,575 ) (1,587 ) (88 ) Investment securities gains, net $ 6,011 2,769 1,331 (1) Includes $1.4 million in gains in 2016 from the transfer of $1.9 million of investment securities available for sale to trading account assets.

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	12 Months Ended
	Dec. 31, 2016
Loans and Allowance for Loan Losses [Abstract]
Loans And Allowance For Loan Losses	Note 6 - Loans and Allowance for Loan Losses Loans outstanding, by classification, at December 31, 2016 and 2015 are summarized below. December 31, (in thousands) 2016 2015 Investment properties $ 5,932,619 5,751,631 1-4 family properties 1,023,821 1,129,156 Land acquisition 409,534 513,981 Total commercial real estate 7,365,974 7,394,768 Commercial, financial and agricultural 6,915,927 6,453,180 Owner-occupied 4,636,016 4,318,950 Total commercial and industrial 11,551,943 10,772,130 Home equity lines 1,617,265 1,689,914 Consumer mortgages 2,296,604 1,938,683 Credit cards 232,413 240,851 Other retail loans 818,183 423,318 Total retail 4,964,465 4,292,766 Total loans 23,882,382 22,459,664 Deferred fees and costs, net (25,991 ) (30,099 ) Total loans, net of deferred fees and costs $ 23,856,391 22,429,565 A substantial portion of the loan portfolio is secured by real estate in markets located throughout Georgia, Alabama, Tennessee, South Carolina, and Florida. Accordingly, the ultimate collectability of a substantial portion of the loan portfolio is susceptible to changes in market conditions in these areas. The following is a summary of current, accruing past due, and non-accrual loans by class as of December 31, 2016 and 2015 . Current, Accruing Past Due, and Non-accrual Loans December 31, 2016 ( 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 $ 5,924,225 2,958 — 2,958 5,436 5,932,619 1-4 family properties 1,000,590 4,962 161 5,123 18,108 1,023,821 Land acquisition 401,346 1,117 — 1,117 7,071 409,534 Total commercial real estate 7,326,161 9,037 161 9,198 30,615 7,365,974 Commercial, financial and agricultural 6,846,591 9,542 720 10,262 59,074 6,915,927 Owner-occupied 4,601,356 17,913 244 18,157 16,503 4,636,016 Total commercial and industrial 11,447,947 27,455 964 28,419 75,577 11,551,943 Home equity lines 1,585,228 10,013 473 10,486 21,551 1,617,265 Consumer mortgages 2,265,966 7,876 81 7,957 22,681 2,296,604 Credit cards 229,177 1,819 1,417 3,236 — 232,413 Other retail loans 809,419 5,771 39 5,810 2,954 818,183 Total retail 4,889,790 25,479 2,010 27,489 47,186 4,964,465 Total loans $ 23,663,898 61,971 3,135 65,106 153,378 23,882,382 (1) December 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 $ 5,726,307 2,284 — 2,284 23,040 5,751,631 1-4 family properties 1,105,914 6,300 103 6,403 16,839 1,129,156 Land acquisition 495,542 639 32 671 17,768 513,981 Total commercial real estate 7,327,763 9,223 135 9,358 57,647 7,394,768 Commercial, financial and agricultural 6,391,036 12,222 785 13,007 49,137 6,453,180 Owner-occupied 4,293,308 5,254 95 5,349 20,293 4,318,950 Total commercial and industrial 10,684,344 17,476 880 18,356 69,430 10,772,130 Home equity lines 1,667,552 5,882 0 5,882 16,480 1,689,914 Consumer mortgages 1,907,644 8,657 134 8,791 22,248 1,938,683 Credit cards 237,742 1,663 1,446 3,109 — 240,851 Other retail loans 418,337 2,390 26 2,416 2,565 423,318 Total retail 4,231,275 18,592 1,606 20,198 41,293 4,292,766 Total loans $ 22,243,382 45,291 2,621 47,912 168,370 22,459,664 (2) (1) Total before net deferred fees and costs of $26.0 million . (2) Total before net deferred fees and costs of $30.1 million . Non-accrual loans as of December 31, 2016 and 2015 were $153.4 million and $168.4 million , respectively. Interest income on non-accrual loans outstanding at December 31, 2016 and 2015 that would have been recorded if the loans had been current and performed in accordance with their original terms was $8.9 million and $10.5 million , respectively. Interest income recorded on these loans for the years ended December 31, 2016 and 2015 was $3.5 million and $4.3 million , respectively. 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 Classified (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, of any underlying collateral in a timely manner. 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 its 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 December 31, 2016 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,843,433 54,486 34,700 — — 5,932,619 1-4 family properties 932,340 51,623 32,853 7,005 — 1,023,821 Land acquisition 360,017 31,360 17,897 260 — 409,534 Total commercial real estate 7,135,790 137,469 85,450 7,265 — 7,365,974 Commercial, financial and agricultural 6,642,648 126,268 140,425 6,445 141 (3) 6,915,927 Owner-occupied 4,462,420 60,856 111,330 1,410 — 4,636,016 Total commercial and industrial 11,105,068 187,124 251,755 7,855 141 11,551,943 Home equity lines 1,589,199 — 22,774 2,892 2,400 (3) 1,617,265 Consumer mortgages 2,271,916 — 23,268 1,283 137 (3) 2,296,604 Credit cards 230,997 — 637 — 779 (4) 232,413 Other retail loans 814,844 — 3,233 42 64 (3) 818,183 Total retail 4,906,956 — 49,912 4,217 3,380 4,964,465 Total loans $ 23,147,814 324,593 387,117 19,337 3,521 23,882,382 (5) December 31, 2015 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,560,595 114,705 76,331 — — 5,751,631 1-4 family properties 995,903 64,325 61,726 7,202 — 1,129,156 Land acquisition 436,835 46,208 30,574 364 — 513,981 Total commercial real estate 6,993,333 225,238 168,631 7,566 — 7,394,768 Commercial, financial and agricultural 6,184,179 152,189 100,658 13,330 2,824 (3) 6,453,180 Owner-occupied 4,118,631 78,490 121,272 98 459 (3) 4,318,950 Total commercial and industrial 10,302,810 230,679 221,930 13,428 3,283 10,772,130 Home equity lines 1,666,586 — 20,456 1,206 1,666 (3) 1,689,914 Consumer mortgages 1,910,649 — 26,041 1,700 293 (3) 1,938,683 Credit cards 239,405 — 480 — 966 (4) 240,851 Other retail loans 418,929 — 4,315 — 74 (3) 423,318 Total retail 4,235,569 — 51,292 2,906 2,999 4,292,766 Total loans $ 21,531,712 455,917 441,853 23,900 6,282 22,459,664 (6) (1) Includes $256.6 million and $303.7 million of Substandard accruing loans at December 31, 2016 and December 31, 2015 , 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 $26.0 million . (6) Total before net deferred fees and costs of $30.1 million . The following table details the change in the allowance for loan losses by loan segment for the years ended December 31, 2016 , 2015 and 2014 . Allowance for Loan Losses and Recorded Investment in Loans As Of and For The Year Ended December 31, 2016 (in thousands) Commercial Real Estate Commercial & Industrial Retail Unallocated Total Allowance for loan losses Beginning balance $ 87,133 122,989 42,374 — 252,496 Charge-offs (18,216 ) (25,039 ) (14,705 ) — (57,960 ) Recoveries 15,226 9,071 4,925 — 29,222 Provision for loan losses (2,327 ) 18,757 11,570 — 28,000 Ending balance $ 81,816 125,778 44,164 — 251,758 Ending balance: individually evaluated for impairment 7,916 8,384 1,811 — 18,111 Ending balance: collectively evaluated for impairment $ 73,900 117,394 42,353 — 233,647 Loans Ending balance: total loans (1) $ 7,365,974 11,551,943 4,964,465 — 23,882,382 Ending balance: individually evaluated for impairment 91,410 120,560 37,526 — 249,496 Ending balance: collectively evaluated for impairment $ 7,274,564 11,431,383 4,926,939 — 23,632,886 As Of and For The Year Ended December 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 (13,998 ) (22,583 ) (20,758 ) — (57,339 ) Recoveries 13,644 8,611 7,253 — 29,508 Provision for loan losses (13,984 ) 18,851 14,143 — 19,010 Ending balance $ 87,133 122,989 42,374 — 252,496 Ending balance: individually evaluated for impairment 18,969 10,477 989 — 30,435 Ending balance: collectively evaluated for impairment $ 68,164 112,512 $ 41,385 $ — 222,061 Loans Ending balance: total loans (2) $ 7,394,768 10,772,130 4,292,766 — 22,459,664 Ending balance: individually evaluated for impairment 157,958 105,599 38,243 — 301,800 Ending balance: collectively evaluated for impairment $ 7,236,810 10,666,531 4,254,523 — 22,157,864 As Of and For The Year Ended December 31, 2014 (in thousands) Commercial Real Estate Commercial & Industrial Retail Unallocated Total Allowance for loan losses Beginning balance $127,646 115,435 41,479 23,000 307,560 Allowance for loan losses of sold Memphis loans (281 ) (398 ) (340 ) — (1,019 ) Charge-offs (49,716 ) (38,941 ) (24,881 ) — (113,538 ) Recoveries 11,787 14,628 8,068 — 34,483 Provision for loan losses 12,035 27,386 17,410 (23,000 ) 33,831 Ending balance $ 101,471 118,110 41,736 — 261,317 Ending balance: individually evaluated for impairment 21,755 10,451 1,270 — 33,476 Ending balance: collectively evaluated for impairment $ 79,716 107,659 40,466 — 227,841 Loans Ending balance: total loans (3) $ 6,926,602 10,267,719 3,934,168 — 21,128,489 Ending balance: individually evaluated for impairment 251,536 146,026 44,586 — 442,148 Ending balance: collectively evaluated for impairment $ 6,675,066 10,121,693 3,889,582 — 20,686,341 (1) Total before net deferred fees and costs of $26.0 million . (2) Total before net deferred fees and costs of $30.1 million . (3) Total before net deferred fees and costs of $30.8 million . Below is a detailed summary of impaired loans (including accruing TDRs) by class as of December 31, 2016 and 2015 . Impaired Loans (including accruing TDRs) December 31, 2016 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded Investment properties $ 748 793 — 5,384 — 1-4 family properties 1,850 5,847 — 1,461 — Land acquisition 892 4,335 — 2,958 — Total commercial real estate 3,490 10,975 — 9,803 — Commercial, financial and agricultural 17,958 20,577 — 6,321 — Owner-occupied 5,508 7,377 — 8,394 — Total commercial and industrial 23,466 27,954 — 14,715 — Home equity lines 1,051 1,051 — 1,045 — Consumer mortgages 744 814 — 870 — Credit cards — — — — — Other retail loans — — — — — Total retail 1,795 1,865 — 1,915 — Total 28,751 40,794 — 26,433 — With allowance recorded Investment properties 32,729 32,729 2,267 42,836 1,699 1-4 family properties 38,972 38,978 4,754 47,806 1,098 Land acquisition 16,219 16,219 895 17,449 486 Total commercial real estate 87,920 87,926 7,916 108,091 3,283 Commercial, financial and agricultural 43,386 45,913 5,687 51,968 1,218 Owner-occupied 53,708 53,942 2,697 52,300 1,946 Total commercial and industrial 97,094 99,855 8,384 104,268 3,164 Home equity lines 9,638 9,638 971 9,668 432 Consumer mortgages 20,953 19,834 673 20,993 1,014 Credit cards — — — — — Other retail loans 5,140 5,140 167 5,062 303 Total retail 35,731 34,612 1,811 35,723 1,749 Total 220,745 222,393 18,111 248,082 8,196 Total Investment properties 33,477 33,522 2,267 48,220 1,699 1-4 family properties 40,822 44,825 4,754 49,267 1,098 Land acquisition 17,111 20,554 895 20,407 486 Total commercial real estate 91,410 98,901 7,916 117,894 3,283 Commercial, financial and agricultural 61,344 66,490 5,687 58,289 1,218 Owner-occupied 59,216 61,319 2,697 60,694 1,946 Total commercial and industrial 120,560 127,809 8,384 118,983 3,164 Home equity lines 10,689 10,689 971 10,713 432 Consumer mortgages 21,697 20,648 673 21,863 1,014 Credit cards — — — — — Other retail loans 5,140 5,140 167 5,062 303 Total retail 37,526 36,477 1,811 37,638 1,749 Total impaired loans $ 249,496 263,187 18,111 274,515 8,196 December 31, 2015 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded Investment properties $ 10,051 12,946 — 11,625 — 1-4 family properties 1,507 5,526 — 2,546 — Land acquisition 8,551 39,053 — 13,897 — Total commercial real estate 20,109 57,525 — 28,068 — Commercial, financial and agricultural 4,393 7,606 — 5,737 — Owner-occupied 8,762 11,210 — 14,657 — Total commercial and industrial 13,155 18,816 — 20,394 — Home equity lines 1,030 1,030 — 573 — Consumer mortgages 814 941 — 995 — Credit cards — — — — — Other retail loans — — — — — Total retail 1,844 1,971 — 1,568 — Total 35,108 78,312 — 50,030 — With allowance recorded Investment properties 62,305 62,305 10,070 73,211 2,131 1-4 family properties 51,376 51,376 6,184 61,690 1,618 Land acquisition 24,168 24,738 2,715 34,793 936 Total commercial real estate 137,849 138,419 18,969 169,694 4,685 Commercial, financial and agricultural 42,914 44,374 8,339 43,740 1,125 Owner-occupied 49,530 49,688 2,138 55,323 1,814 Total commercial and industrial 92,444 94,062 10,477 99,063 2,939 Home equity lines 9,575 9,575 206 8,318 346 Consumer mortgages 22,173 23,297 651 26,044 1,229 Credit cards — — — — — Other retail loans 4,651 4,651 132 5,105 323 Total retail 36,399 37,523 989 39,467 1,898 Total 266,692 270,004 30,435 308,224 9,522 Total Investment properties 72,356 75,251 10,070 84,836 2,131 1-4 family properties 52,883 56,902 6,184 64,236 1,618 Land acquisition 32,719 63,791 2,715 48,690 936 Total commercial real estate 157,958 195,944 18,969 197,762 4,685 Commercial, financial and agricultural 47,307 51,980 8,339 49,477 1,125 Owner-occupied 58,292 60,898 2,138 69,980 1,814 Total commercial and industrial 105,599 112,878 10,477 119,457 2,939 Home equity lines 10,605 10,605 206 8,891 346 Consumer mortgages 22,987 24,238 651 27,039 1,229 Credit cards — — — — — Other retail loans 4,651 4,651 132 5,105 323 Total retail 38,243 39,494 989 41,035 1,898 Total impaired loans $ 301,800 348,316 30,435 358,254 9,522 The average recorded investment in impaired loans was $622.0 million for the year ended December 31, 2014 . Excluding accruing TDRs, there was no interest income recognized for the investment in impaired loans for the years ended December 31, 2016 , 2015 , and 2014 . Interest income recognized for accruing TDRs was $14.9 million for the year ended December 31, 2014 . At December 31, 2016 , 2015 , and 2014 , impaired loans of $53.7 million , $77.9 million , and $93.7 million , respectively, 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 three 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 years ended December 31, 2016 , 2015 , and 2014 that were reported as accruing or non-accruing TDRs. TDRs by Concession Type Year Ended December 31, 2016 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties 4 $ — 1,825 3,518 5,343 1-4 family properties 39 — 5,499 1,488 6,987 Land acquisition 14 — — 4,099 4,099 Total commercial real estate 57 — 7,324 9,105 16,429 Commercial, financial and agricultural 63 — 17,509 7,160 24,669 Owner-occupied 9 — 7,884 550 8,434 Total commercial and industrial 72 — 25,393 7,710 33,103 Home equity lines 5 — 225 123 348 Consumer mortgages 7 — 413 51 464 Credit cards — — — — — Other retail loans 28 — 394 2,256 2,650 Total retail 40 — 1,032 2,430 3,462 Total loans 169 $ — 33,749 19,245 52,994 (1) (1) As a result of these loans being reported as TDRs, there were no net charge-offs recorded during 2016 . TDRs by Concession Type Year Ended December 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 11 $ — 25,052 6,973 32,025 1-4 family properties 43 14,823 4,667 2,763 22,253 Land acquisition 12 — 614 1,532 2,146 Total commercial real estate 66 14,823 30,333 11,268 56,424 Commercial, financial and agricultural 91 29 3,191 6,477 9,697 Owner-occupied 10 — 3,417 2,064 5,481 Total commercial and industrial 101 29 6,608 8,541 15,178 Home equity lines 53 — 2,826 2,905 5,731 Consumer mortgages 15 — 1,011 895 1,906 Credit cards — — — — — Other retail loans 27 — 444 703 1,147 Total retail 95 — 4,281 4,503 8,784 Total loans 262 $ 14,852 41,222 24,312 80,386 (1) (1) As a result of these loans being reported as TDRs, there were net charge-offs of $4.0 million recorded during 2015 . TDRs by Concession Type Year Ended December 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 15 $ — 8,423 5,813 14,236 1-4 family properties 68 — 6,611 6,492 13,103 Land acquisition 16 2,338 4,783 2,688 9,809 Total commercial real estate 99 2,338 19,817 14,993 37,148 Commercial, financial and agricultural 89 60 10,066 21,141 31,267 Owner-occupied 18 — 23,404 14,862 38,266 Total commercial and industrial 107 60 33,470 36,003 69,533 Home equity lines 20 — 2,335 451 2,786 Consumer mortgages 19 — 2,735 867 3,602 Credit cards — — — — — Other retail loans 27 — 663 566 1,229 Total retail 66 — 5,733 1,884 7,617 Total loans 272 $ 2,398 59,020 52,880 114,298 (1) (1) As a result of these loans being reported as TDRs, there were net charge-offs of approximately $163 thousand recorded during 2014 . For the years ended December 31, 2016, 2015, and 2014 , there were two defaults with a recorded investment of $181 thousand , seven defaults with a recorded investment of $12.5 million , and fifteen defaults with a recorded investment of $3.6 million , respectively, on accruing TDRs restructured during the previous twelve months (defaults are defined as the earlier of the TDR being place on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments). If at the time that a loan was designated as a TDR the loan was not already impaired, the measurement of impairment resulting 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 a TDR is not significant. At December 31, 2016 , the allowance for loan losses allocated to accruing TDRs totaling $195.8 million was $9.8 million compared to accruing TDR's of $223.9 million with a related allowance for loan losses of $12.6 million at December 31, 2015 . Non-accrual non-homogeneous loans (commercial-type impaired loan relationships 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. In the ordinary course of business, Synovus Bank has made loans to certain Synovus and Synovus Bank executive officers and directors (including their related interests). Management believes that such loans are made on the same terms, including interest rate and collateral, as those prevailing at the time for comparable transactions with unaffiliated customers. The following is a summary of such loans and the activity in these loans for the year ended December 31, 2016 . (in thousands) Balance at December 31, 2015 $ 41,441 New loans 193,477 Repayments (179,345 ) Loans charged-off — Balance at December 31, 2016 $ 55,573 At December 31, 2016 , there were no loans to executive officers and directors that were classified as nonaccrual, greater than 90 days past due and still accruing, or potential problem loans.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Other Comprehensive Income (Loss)	Note 7 - Other Comprehensive Income (Loss) The following table illustrates activity within the balances in accumulated other comprehensive income (loss) by component, and is shown for the years ended December 31, 2016 , 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 at December 31, 2013 $ (13,099 ) (28,936 ) 777 (41,258 ) Other comprehensive income before reclassifications — 29,041 243 29,284 Amounts reclassified from accumulated other comprehensive income (loss) 275 (818 ) (88 ) (631 ) Net current period other comprehensive income 275 28,223 155 28,653 Balance at December 31, 2014 $ (12,824 ) (713 ) 932 (12,605 ) Other comprehensive income (loss) before reclassifications — (15,806 ) 143 (15,663 ) Amounts reclassified from accumulated other comprehensive income (loss) 320 (1,703 ) (168 ) (1,551 ) Net current period other comprehensive income (loss) 320 (17,509 ) (25 ) (17,214 ) Balance at December 31, 2015 $ (12,504 ) (18,222 ) 907 (29,819 ) Other comprehensive income (loss) before reclassifications — (22,405 ) 63 (22,342 ) Amounts reclassified from accumulated other comprehensive income (loss) 287 (3,697 ) (88 ) (3,498 ) Net current period other comprehensive income (loss) 287 (26,102 ) (25 ) (25,840 ) Balance at December 31, 2016 $ (12,217 ) (44,324 ) 882 (55,659 ) 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 instruments, equity securities, and debt securities as a single portfolio. As of December 31, 2016, the ending balance in net unrealized gains (losses) on cash flow hedges and net unrealized gains (losses) on investment securities available for sale includes unrealized losses of $12.1 million and $13.3 million , respectively, related to the residual tax effects remaining in OCI due to the previously established deferred tax asset valuation allowance. Under the portfolio approach, these unrealized losses are realized at the time the entire portfolio is sold or disposed. The following table illustrates activity within the reclassifications out of accumulated other comprehensive income (loss), for the years ended December 31, 2016 , 2015 , and 2014 . Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Details About Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified From Accumulated Other Comprehensive Income (Loss) Affected Line Item in the Statement Where Net Income is Presented For the Years Ended December 31, 2016 2015 2014 Net unrealized gains (losses) on cash flow hedges: Amortization of deferred losses $ (270 ) (448 ) (448 ) Interest expense Amortization of deferred losses (197 ) (73 ) — Loss on early extinguishment of debt, net 180 201 173 Income tax (expense) benefit $ (287 ) (320 ) (275 ) Reclassifications, net of income taxes Net unrealized gains (losses) on investment securities available for sale: Realized gains, net on sales of securities (1) $ 6,011 2,769 1,331 Investment securities gains, net (2,314 ) (1,066 ) (513 ) Income tax (expense) benefit $ 3,697 1,703 818 Reclassifications, net of income taxes Post-retirement unfunded health benefit: Amortization of actuarial gains $ 144 272 144 Salaries and other personnel expense (56 ) (104 ) (56 ) Income tax (expense) benefit $ 88 $ 168 $ 88 Reclassifications, net of income taxes (1) Includes $1.4 million in gains in 2016 from the transfer of $1.9 million of investment securities available for sale to trading account assets.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	Note 8 - Premises and Equipment Premises and equipment at December 31, 2016 and 2015 consists of the following: (in thousands) Useful Life (in years) 2016 2015 Land Indefinite $ 97,080 106,656 Buildings and improvements 10 - 40 377,754 403,437 Leasehold improvements 10 - 40 41,355 41,095 Furniture and equipment 3 - 10 370,458 406,121 Construction in progress 29,104 44,120 Total premises and equipment 915,751 1,001,429 Less: Accumulated depreciation and amortization (498,266 ) (556,274 ) Premises and equipment, net $ 417,485 445,155 Net premises and equipment included $1.6 million and $1.7 million related to net capital leases at December 31, 2016 and 2015, respectively. Aggregate rent expense (principally for offices) net of sublease income, totaled $21.4 million , $23.1 million , and $22.8 million for the years ended December 31, 2016, 2015, and 2014, respectively. Depreciation and amortization expense for the years ended December 31, 2016, 2015, and 2014 totaled $37.1 million , $35.3 million , and $33.9 million , respectively. During the year ended December 31, 2016, Synovus transferred premises and equipment with a net book value of $25.2 million to other properties held for sale, a component of other assets. Additionally, during 2016, Synovus retired $68.4 million of zero net book value obsolete assets from the furniture and equipment category. Lease Commitments Synovus and its subsidiaries have entered into long-term operating leases for various facilities and equipment. Management expects that as these leases expire they will be renewed or replaced by similar leases based on need. At December 31, 2016 , minimum rental commitments under all such non-cancelable leases for the next five years and thereafter are presented below. (in thousands) 2017 $ 27,527 2018 28,289 2019 25,484 2020 24,579 2021 22,247 Thereafter 154,219 Total $ 282,345

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 9 - Goodwill and Other Intangible Assets At December 31, 2016 and 2015 , the net carrying value of goodwill, net of accumulated impairment losses, was $59.7 million , consisting of goodwill associated with two reporting units. $24.4 million of the goodwill was attributable to the trust services reporting unit, and the remaining goodwill of $35.2 million was attributable to the Synovus Bank reporting unit and is a result of the Global One business combination completed during 2016. In connection with the acquisition, Synovus also acquired other intangible assets with preliminary fair values of $13.4 million consisting of existing borrower relationships, trade name, and distribution network. At December 31, 2016, other intangible assets had gross carrying amounts of $14.0 million , accumulated amortization of $817 thousand , and total net carrying value of $13.2 million . Aggregate other intangible assets amortization expense for the years ended December 31, 2016, 2015, and 2014 was $521 thousand , $503 thousand , and $603 thousand , respectively. Aggregate estimated amortization expense over the next five years is $1.1 million for 2017 and $1.2 million for each of the years 2018 through 2021. At June 30, 2016, Synovus completed its annual goodwill impairment evaluation of the trust services reporting unit, and as a result of this evaluation, concluded that goodwill was not impaired. The estimated fair value of the trust services reporting unit was $129.2 million , which exceeded the carrying value of $77.4 million by $51.8 million , or 40% . The following table shows the changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 : (in thousands) Trust Services Reporting Unit Synovus Bank Reporting Unit Total Balance as of January 1, 2016 Goodwill $ 24,431 — 24,431 Accumulated impairment losses — — — 24,431 — 24,431 Goodwill acquired during year — 35,247 35,247 Impairment losses — — — Goodwill, net as of December 31, 2016 $ 24,431 35,247 59,678

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2016
Other Assets [Abstract]
Other Assets	Note 10 - Other Assets Significant balances included in other assets at December 31, 2016 and 2015 are presented below. (in thousands) 2016 2015 Cash surrender value of bank-owned life insurance $ 378,830 338,002 Federal Reserve Bank and FHLB stock 169,864 68,288 Accrued interest receivable 70,393 65,218 Prepaid expenses 35,542 33,348 Accounts receivable 29,821 19,692 Private equity investments 25,493 28,018 Derivative asset positions 20,623 27,139 Other properties held for sale 14,830 10,671 SBA/GGL servicing assets, net 4,451 4,287 Miscellaneous other assets 63,373 55,511 Total other assets $ 813,220 650,174 Synovus’ investment in bank-owned life insurance programs at December 31, 2016 and December 31, 2015 included approximately $15 million and $32 million , respectively, of separate account life insurance policies covered by stable value agreements. At December 31, 2016 , the fair value of the investments underlying the separate account policies was approximately $14 million , which was within the coverage provided by the stable value agreements.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Interest-bearing Deposit Liabilities [Abstract]
Deposits	Note 11 - Deposits A summary of interest bearing deposits at December 31, 2016 and 2015 is presented below. ( in thousands) 2016 2015 Interest bearing demand deposits $ 4,768,313 4,377,407 Money market accounts, excluding brokered deposits 7,251,093 7,042,350 Savings accounts 929,402 714,410 Time deposits, excluding brokered deposits 3,234,465 3,300,004 Brokered deposits 1,378,983 1,075,520 Total interest bearing deposits $ 17,562,256 16,509,691 The aggregate amount of time deposits of $250,000 or more was $829.5 million at December 31, 2016 and $774.3 million at December 31, 2015 . The following table presents contractual maturities of all time deposits at December 31, 2016 . (in thousands) Maturing within one year $ 2,424,336 Between 1 — 2 years 922,828 2 — 3 years 278,722 3 — 4 years 204,813 4 — 5 years 99,288 Thereafter 22,481 $ 3,952,468

Long-term Debt and Short-term B

Long-term Debt and Short-term Borrowings	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-term Debt and Short-term Borrowings	Note 12 - Long-term Debt and Short-term Borrowings Long-term debt at December 31, 2016 and 2015 is presented in the following table. (in thousands) 2016 2015 Parent Company: 5.125% subordinated notes, due June 15, 2017, $278.6 million and $403.3 million par value at December 31, 2016 and 2015, respectively, with semi-annual interest payments and principal to be paid at maturity $ 278,480 402,812 7.875% senior notes, due February 15, 2019, $300 million par value with semi-annual interest payments and principal to be paid at maturity 297,763 296,711 5.75% fixed to adjustable rate subordinated notes, due December 15, 2025, $250 million par value with semi-annual interest payments at 5.75% for the first five years and quarterly payments thereafter at an adjustable rate equal to the then-current three month LIBOR rate + 418.2 basis points and principal to be paid at maturity 247,136 246,644 LIBOR + 1.80% debentures, due April 19, 2035, $10 million par value with quarterly interest payments and principal to be paid at maturity (rate of 2.76% at December 31, 2016 and 2.31% at December 31, 2015) 10,000 10,000 Hedge-related basis adjustment (1) 873 4,018 Total long-term debt — Parent Company 834,252 960,185 Synovus Bank: FHLB advances with interest and principal payments due at various maturity dates through 2022 and interest rates ranging from 0.63% to 0.66% at December 31, 2016 (weighted average interest rate of 0.64% and 0.46% at December 31, 2016 and 2015, respectively) 1,325,000 1,225,000 Capital lease with interest and principal payments due at various dates through 2031 (rate of 1.59% at both December 31, 2016 and 2015, respectively) 1,629 1,708 Total long-term debt — Synovus Bank 1,326,629 1,226,708 Total long-term debt $ 2,160,881 2,186,893 (1) Unamortized balance of terminated interest rate swaps reflected in debt for financial reporting purposes. During January 2016, Synovus repurchased $124.7 million of its subordinated notes maturing in 2017 in conjunction with Synovus' cash tender offer that commenced on December 23, 2015 and expired on January 22, 2016. 2016 results include a $4.7 million pre-tax loss relating to this tender offer. On December 7, 2015, Synovus issued $250 million aggregate principal amount of the 2025 subordinated debt in a public offering for aggregate proceeds of $246.6 million , net of debt issuance costs. Also during the fourth quarter of 2015, Synovus repurchased $46.7 million of its subordinated notes maturing in 2017 in privately negotiated transactions which resulted in a pre-tax loss of $1.5 million . The provisions of the indentures governing Synovus’ long-term debt contain certain restrictions within specified limits on mergers, sales of all or substantially all of Synovus' assets and limitations on sales and issuances of voting stock of subsidiaries and Synovus’ ability to pay dividends on its capital stock if there is an event of default under the applicable indenture. As of December 31, 2016 and 2015 , Synovus and its subsidiaries were in compliance with the covenants in these agreements. The FHLB advances are secured by certain loans receivable with a recorded balance of $3.25 billion at December 31, 2016 and $3.26 billion at December 31, 2015 . Contractual annual principal payments on long-term debt for the next five years and thereafter are shown on the following table. (in thousands) Parent Company Synovus Bank Total 2017 $ 278,591 88 278,679 2018 — 89 89 2019 300,000 275,090 575,090 2020 — 350,092 350,092 2021 — 450,097 450,097 Thereafter 260,000 251,173 511,173 Total $ 838,591 1,326,629 2,165,220 The following table sets forth certain information regarding federal funds purchased and other securities sold under repurchase agreements. (dollars in thousands) 2016 2015 2014 Total balance at December 31, $ 159,699 177,025 126,916 Weighted average interest rate at December 31, 0.08 % 0.08 0.08 Maximum month end balance during the year $ 286,175 250,453 247,170 Average amount outstanding during the year 216,593 205,305 198,085 Weighted average interest rate during the year 0.09 % 0.08 0.11

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Note 13 - Shareholders' Equity The following table shows the changes in shares of preferred and common stock issued and common stock held as treasury shares for the three years ended December 31, 2016 . (shares in thousands) Series C Preferred Stock Issued Common Stock Issued Treasury Stock Held Common Stock Outstanding Balance at December 31, 2013 5,200 139,721 813 138,908 Restricted share unit activity — 52 — 52 Stock options exercised — 177 — 177 Repurchase of common stock — — 3,014 (3,014 ) Balance at December 31, 2014 5,200 139,950 3,827 136,123 Restricted share unit activity — 304 — 304 Stock options exercised — 338 — 338 Repurchase of common stock — — 7,218 (7,218 ) Balance at December 31, 2015 5,200 140,592 11,045 129,547 Issuance of common stock for acquisition — 821 — 821 Restricted share unit activity — 316 — 316 Stock options exercised — 297 — 297 Repurchase of common stock — — 8,715 (8,715 ) Balance at December 31, 2016 5,200 142,026 19,760 122,266 Issuance of Common Stock for Acquisition On October 1, 2016, Synovus completed its acquisition of Global One. Under the terms of the merger agreement, Synovus acquired Global One for an up-front payment of $30 million , consisting of the issuance of 821 thousand shares of Synovus common stock valued at $26.6 million and $3.4 million in cash, with additional annual payments to the former shareholders of Global One for three to five years based on a percentage of Global One's earnings as defined in the merger agreement. Please refer to Note 2 - "Acquisition" of this Report for more information on the acquisition of Global One. Repurchases of Common Stock Synovus completed its $300 million share repurchase program during the fourth quarter of 2016. This program was authorized during the third quarter of 2015 and was executed over a 15 month period through a combination of open market transactions and an ASR. In 2016, Synovus repurchased a total of $262.9 million , or 8.7 million shares, of common stock, $212.9 million , or 7.3 million shares, of common stock of which was executed through open market transactions and $50.0 million , or 1.4 million shares, of which was executed through an ASR. During the fourth quarter of 2015, Synovus repurchased $37.1 million , or 1.2 million shares, through open market transactions. Synovus completed its $250 million share repurchase program during the third quarter of 2015. This program was announced on October 21, 2014 and expired on October 23, 2015. Under this program, Synovus repurchased 9.1 million shares of common stock through a combination of open market transactions and an ASR. From October 2014 through September 30, 2015, Synovus repurchased $175.0 million , or 6.2 million shares, of common stock through open market transactions, including $161.9 million , or 5.7 million shares, of common stock repurchased during 2015. Synovus also entered into a $75.0 million ASR in October 2014. During 2014, Synovus repurchased 2.5 million shares of common stock under this ASR, and during January 2015, Synovus repurchased 392 thousand shares upon completion of this ASR. Reverse Stock Split On April 24, 2014, at Synovus' 2014 annual shareholders' meeting, Synovus’ shareholders approved a proposal authorizing Synovus’ Board of Directors to effect a one-for-seven reverse stock split of Synovus’ common stock. 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 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.

Regulatory Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Disclosure [Abstract]
Regulatory Capital	Note 14 - Regulatory Capital Synovus is subject to regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, Synovus must meet specific capital levels that involve quantitative measures of both on- and off-balance sheet items as calculated under regulatory capital guidelines. Capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. The Basel III capital rules became effective January 1, 2015, for Synovus and Synovus Bank, subject to a transition period for several aspects, including the capital conservation buffer and certain regulatory capital adjustments and deductions, as described below. Under the Basel III capital rules, the minimum capital requirements for Synovus and Synovus Bank include a common equity Tier 1 (CET1) ratio of 4.5% ; Tier 1 capital ratio of 6% ; total capital ratio of 8% ; and leverage ratio of 4% . When fully phased-in on January 1, 2019, the Basel III capital rules include a capital conservation buffer of 2.5% that is added on top of each of the minimum risk-based capital ratios. The implementation of the capital conservation buffer began on January 1, 2016 at the 0.625% level and will be phased-in over a three -year period (increasing by that amount on each subsequent January 1, until it reaches 2.5% on January 1, 2019). As a financial holding company, Synovus and its subsidiary bank, Synovus Bank, are required to maintain capital levels required for a well-capitalized institution as defined by federal banking regulations. Under the Basel III capital rules, Synovus and Synovus Bank are well-capitalized if each has a CET1 ratio of 6.5% or greater, a Tier 1 risk-based capital ratio of 8% or greater, a total risk-based capital ratio of 10% or greater, a leverage ratio of 5% or greater, and are not subject to any written agreement, order, capital directive, or prompt corrective action directive from a federal and/or state banking regulatory agency to meet and maintain a specific capital level for any capital measure. Management currently believes, based on internal capital analysis and earnings projections, that Synovus' capital position is adequate to meet current and future regulatory minimum capital requirements. The following table summarizes regulatory capital information at December 31, 2016 and 2015 on a consolidated basis and for Synovus’ significant subsidiary, defined as any direct subsidiary with assets or net income levels exceeding 10% of the consolidated totals. Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions (1) (dollars in thousands) 2016 2015 2016 2015 2016 2015 Synovus Financial Corp. Tier 1 capital $ 2,685,880 2,660,016 1,599,725 1,538,637 N/A N/A Common equity tier 1 capital 2,654,287 2,660,016 1,199,794 1,153,977 N/A N/A Total risk-based capital 3,201,268 3,255,758 2,132,966 2,051,515 N/A N/A Tier 1 risk-based capital ratio 10.07 % 10.37 6.00 6.00 N/A N/A Common equity tier 1 capital ratio 9.96 10.37 4.50 4.50 N/A N/A Total risk-based capital ratio 12.01 12.70 8.00 8.00 N/A N/A Leverage ratio 8.99 9.43 4.00 4.00 N/A N/A Synovus Bank Tier 1 capital $ 3,187,583 3,136,132 1,597,302 1,535,541 2,129,736 2,047,388 Common equity tier 1 capital 3,187,583 3,136,132 1,197,976 1,151,656 1,730,410 1,663,503 Total risk-based capital 3,441,563 3,390,764 2,129,736 2,047,388 2,662,169 2,559,235 Tier 1 risk-based capital ratio 11.97 % 12.25 6.00 6.00 8.00 8.00 Common equity tier 1 capital ratio 11.97 12.25 4.50 4.50 6.50 6.50 Total risk-based capital ratio 12.93 13.25 8.00 8.00 10.00 10.00 Leverage ratio 10.68 11.15 4.00 4.00 5.00 5.00 (1) The prompt corrective action provisions are applicable at the bank level only.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income Per Common Share	Note 15 - Net Income Per Common Share The following table displays a reconciliation of the information used in calculating basic and diluted net income per common share for the years ended December 31, 2016 , 2015 , and 2014 . Years Ended December 31, (in thousands, except per share data) 2016 2015 2014 Net income $ 246,784 226,082 195,249 Dividends on preferred stock 10,238 10,238 10,238 Net income available to common shareholders $ 236,546 215,844 185,011 Weighted average common shares outstanding 124,389 132,423 138,495 Potentially dilutive shares from outstanding equity-based awards 689 778 659 Weighted average diluted common shares 125,078 133,201 139,154 Net income per common share, basic $ 1.90 1.63 1.34 Net income per common share, diluted $ 1.89 1.62 1.33 For the years ended December 31, 2016 , 2015 , and 2014 , there were 2.2 million , 2.8 million , and 3.3 million potentially dilutive shares, respectively, related to Warrants and stock options to purchase shares of common stock that were outstanding during 2016 , 2015 , and 2014 , respectively, but were not included in the computation of diluted net income per common share because the effect would have been anti-dilutive.

Fair Value Accounting

Fair Value Accounting	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Accounting	Note 16 - 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. Synovus has implemented controls and processes for the determination of the fair value of financial instruments. The ultimate responsibility for the determination of fair value rests with Synovus. Synovus has established a process that has been designed to ensure there is an independent review and validation of fair values by a function independent of those entering into the transaction. This includes specific controls to ensure consistent pricing policies and procedures that incorporate verification for both market and derivative transactions. For all financial instruments where fair values are determined by reference to externally quoted prices or observable pricing inputs to models, independent price determination or validation is utilized. Where the market for a financial instrument is not active, fair value is determined using a valuation technique or pricing model. These valuation techniques and models involve a degree of estimation, the extent of which depends on each instrument's complexity and the availability of market-based data. The most frequently applied pricing model and valuation technique utilized by Synovus is the discounted cash flow model. Discounted cash flows determine the value by estimating the expected future cash flows from assets or liabilities discounted to their present value. Synovus may also use a relative value model to determine the fair value of a financial instrument based on the market prices of similar assets or liabilities or an option pricing model such as binomial pricing that includes probability-based techniques. Assumptions and inputs used in valuation techniques and models include benchmark interest rates, credit spreads and other inputs used in estimating discount rates, bond and equity prices, price volatilities and correlations, prepayment rates, probability of default, and loss severity upon default. Synovus refines and modifies its valuation techniques as markets develop and as pricing for individual financial instruments become more or less readily available. While Synovus believes its valuation techniques are appropriate and consistent with other market participants, the use of different methodologies or assumptions could result in different estimates of fair value at the balance sheet date. In order to determine the fair value, where appropriate, management applies valuation adjustments to the pricing information. These adjustments reflect management's assessment of factors that market participants would consider in setting a price, to the extent that these factors have not already been included in the pricing information. Furthermore, on an ongoing basis, management assesses the appropriateness of any model used. To the extent that the price provided by internal models does not represent the fair value of the financial instrument, management makes adjustments to the model valuation to calibrate it to other available pricing sources. Where unobservable inputs are used, management may determine a range of possible valuations based upon differing stress scenarios to determine the sensitivity associated with the valuation. As a final step, management considers the need for further adjustments to the modeled price to reflect how market participants would price the financial instrument. 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, 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 GSEs and agencies, obligations of states and municipalities, collateralized mortgage obligations issued by GSEs, 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 consists of collateral-dependent impaired loans, other real estate, certain corporate securities, private equity investments, and contingent consideration. Fair Value Option Synovus has elected the fair value option for mortgage loans held for sale primarily to ease the operational burdens required to maintain hedge accounting for these loans. Synovus is still able to achieve effective economic hedges on mortgage loans held for sale without the time and expense needed to manage a hedge accounting program. Valuation Methodology by Product Following is a description of the valuation methodologies used for the major categories of financial assets and liabilities measured at fair value. Trading Account Assets and Investment Securities Available for Sale The fair values of trading securities and investment securities available for sale are primarily based on actively traded markets where prices are based on either quoted market prices or observed transactions. Management employs independent third-party pricing services to provide fair value estimates for Synovus' investment securities available for sale and trading securities. Fair values for fixed income investment securities are typically determined based upon quoted market prices, broker/dealer quotations for identical or similar securities, and/or inputs that are observable in the market, either directly or indirectly, for substantially similar securities. Level 1 securities are typically exchange quoted prices and include financial instruments such as U.S. Treasury securities, marketable equity securities, and mutual fund investments. Level 2 securities are typically matrix priced by the third-party pricing service to calculate the fair value. Such fair value measurements consider observable data such as market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayments speeds, credit information, and the respective terms and conditions for debt instruments. The types of securities classified as Level 2 within the valuation hierarchy primarily consist of collateralized mortgage obligations, mortgage-backed securities, debt securities of GSEs and agencies, corporate debt, and state and municipal securities. When there is limited activity or less transparency around inputs to valuation, Synovus develops valuations based on assumptions that are not readily observable in the marketplace; these securities are classified as Level 3 within the valuation hierarchy. The majority of the balance of Level 3 investment securities available for sale consists primarily of trust preferred securities issued by financial institutions. Synovus also carries non-marketable common equity securities within this category. Synovus accounts for the non-marketable common equity securities in accordance with ASC 325-20 which requires these investments to be carried at cost. To determine the fair value of the trust preferred securities, management uses a measurement technique to reflect one that utilizes credit spreads and/or credit indices available from a third-party pricing service. In addition, for each trust preferred security, management projects non-credit adjusted cash flows, and discounts those cash flows to net present value incorporating a relevant credit spread in the discount rate. Other inputs to calculating fair value include potential discounts for lack of marketability. Management uses various validation procedures to confirm the prices received from pricing services and quotations received from dealers are reasonable. Such validation procedures include reference to market quotes and a review of valuations and trade activity of comparable securities. Consideration is given to the nature of the quotes (e.g., indicative or firm) and the relationship of recently evidenced market activity to the prices provided by the third-party pricing service. Further, management also employs the services of an additional independent pricing firm as a means to verify and confirm the fair values of the primary independent pricing firms. Mortgage Loans Held for Sale Synovus elected to apply the fair value option for mortgage loans originated with the intent to sell to investors. When loans are not committed to an investor at a set price, fair value is derived from a hypothetical bulk sale model used to estimate the exit price of the loans in a loan sale. The bid pricing convention is used for loan pricing for similar assets. The valuation model is based upon forward settlements of a pool of loans of similar coupon, maturity, product, and credit attributes. The inputs to the model are continuously updated with available market and historical data. As the loans are sold in the secondary market and primarily used as collateral for securitizations, the valuation model represents the highest and best use of the loans in Synovus’ principal market. Mortgage loans held for sale are classified within Level 2 of the valuation hierarchy. Private Equity Investments Private equity investments consist primarily of equity method investments in venture capital funds, which are classified as Level 3 within the valuation hierarchy. The valuation of these investments requires significant judgment due to the absence of quoted market prices, inherent lack of liquidity, and the long-term nature of such investments. Based on these factors, the ultimate realizable value of these investments could differ significantly from the value reflected in the accompanying audited consolidated financial statements. For ownerships in publicly traded companies held in the funds, valuation is based on the closing market price at the balance sheet date, with such investments being classified as Level 1 or 2 within the valuation hierarchy. The valuation of marketable securities that have trading restrictions is discounted until the securities can be freely traded. The private equity investments in which Synovus holds a limited partnership interest consist of funds that invest in privately held companies. For privately held companies in the funds, the general partner estimates the fair value of the company in accordance with GAAP, as clarified by ASC 820, and guidance specific to investment companies. The estimated fair value of the company is the estimated fair value as an exit price the fund would receive if it were to sell the company in the marketplace. The fair value of the fund's underlying investments is estimated through the use of valuation models such as option pricing or a discounted cash flow model. Valuation factors, such as a company's operational performance against budget or milestones, last price paid by investors, with consideration given on whether financing is provided by insiders or unrelated new investors, public market comparables, liquidity of the market, industry and economic trends, and changes in management or key personnel, are used in the determination of fair value. Also, for the year ended December 31, 2015, Synovus held an interest in an investment fund that invested in publicly traded financial services companies. Although the fund held investments in publicly traded entities, the fair value of this investment was classified as Level 2 in the valuation hierarchy because there was no actively traded market for the fund itself, and the value of the investment was based on the aggregate fair value of the publicly traded companies that were held in the fund for investment. Mutual Funds Held in Rabbi Trusts Mutual funds held in rabbi trusts primarily invest in equity and fixed income securities. Shares of mutual funds are valued based on quoted market prices, and are therefore classified within Level 1 of the fair value hierarchy. Other Liabilities Other liabilities measured at fair value on a recurring basis include a contingent consideration obligation related to the Global One acquisition. Contingent consideration associated with the acquisition will be adjusted to fair value until settled. Since the assumptions used to measure fair value are based on internal metrics that are not market observable, the Earnout Payment liability is classified as Level 3. Derivative Assets and Liabilities 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. With the exception of one derivative contract discussed herein, Synovus' derivative financial instruments are all Level 2 financial instruments. The majority of derivatives entered into by Synovus are executed over-the-counter and consist of interest rate swaps. The fair values of these derivative instruments are determined based on an internally developed model that uses readily observable market data, as quoted market prices are not available for these instruments. The valuation models and inputs depend on the type of derivative and the nature of the underlying instrument, and include interest rates, prices and indices to generate continuous yield or pricing curves, volatility factors, and customer credit related adjustments. The principal techniques used to model the value of these instruments are an income approach, discounted cash flows, and Black-Scholes or binomial pricing models. The sale of TBA mortgage-backed securities for current month delivery or in the future and the purchase of option contracts of similar duration are derivatives utilized by Synovus, and are valued by obtaining prices directly from dealers in the form of quotes for identical securities or options using a bid pricing convention with a spread between bid and offer quotations. Interest rate swaps, floors, caps and collars, and TBA mortgage-backed securities are classified as Level 2 within the valuation hierarchy. Synovus enters into interest rate lock commitments related to expected funding of residential mortgage loans at specified times in the future. Interest rate lock commitments that relate to the origination of mortgage loans that will be held-for-sale are considered derivative instruments under applicable accounting guidance. As such, Synovus records its interest rate lock commitments and forward loan sales commitments at fair value, determined as the amount that would be required to settle each of these derivative financial instruments at the balance sheet date. In the normal course of business, Synovus enters into contractual interest rate lock commitments to extend credit at a fixed interest rate and with fixed expiration dates. The commitments become effective when the borrowers "lock-in" a specified interest rate within the established time frames. Market risk arises if interest rates move adversely between the time of the interest rate lock by the borrower and the sale date of the loan to an investor. To mitigate the effect of the interest rate risk inherent in providing interest rate lock commitments to borrowers, Synovus enters into best efforts forward sales contracts with third-party investors. The forward sales contracts lock in a price for the sale of loans similar to the specific interest rate lock commitments. Both the interest rate lock commitments to the borrowers and the forward sales contracts to the investors are derivatives, and accordingly, are marked to fair value through earnings. In estimating the fair value of an interest rate lock commitment, Synovus assigns a probability to the interest rate lock commitment based on an expectation that it will be exercised and the loan will be funded. The fair value of the interest rate lock commitment is derived from the fair value of related mortgage loans, which is based on observable market data and includes the expected net future cash flows related to servicing of the loans. The fair value of the interest rate lock commitment is also derived from inputs that include guarantee fees negotiated with the agencies and private investors, buy-up and buy-down values provided by the agencies and private investors, and interest rate spreads for the difference between retail and wholesale mortgage rates. Management also applies fall-out ratio assumptions to the interest rate lock commitments in anticipation of those mortgage loans which will not close. The fall-out ratio assumptions are based on Synovus' historical experience, conversion ratios for similar loan commitments, and market conditions. While fall-out tendencies are not exact predictions of which loans will or will not close, historical performance review of loan-level data provides the basis for determining the appropriate hedge ratios. In addition, on a periodic basis, Synovus performs analyses of actual rate lock fall-out experience to determine the sensitivity of the mortgage pipeline to interest rate changes from the date of the commitment through loan origination. The expected fall-out ratios (or conversely the "pull-through" percentages) are applied to the determined fair value of the mortgage pipeline. Changes to the fair value of interest rate lock commitments are recognized based on interest rate changes, changes in the probability that the commitment will be exercised, and the passage of time. The fair value of the forward sales contracts to investors considers the market price movement of the same type of security between the trade date and the balance sheet date. These instruments are classified as Level 2 within the valuation hierarchy. In November 2009, Synovus sold certain Visa Class B shares to another Visa USA member financial institution. The sales price was based on the Visa stock conversion ratio in effect at the time for conversion of Visa Class B shares to Visa Class A unrestricted shares at a future date. In conjunction with the sale, Synovus entered into a derivative contract with the purchaser (the Visa derivative), 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 fair value of the Visa derivative 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. Since this estimation process requires application of judgment in developing significant unobservable inputs used to determine the fair value of the Visa derivative, this derivative has been classified as Level 3 within the valuation hierarchy. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 19 - Visa Shares and Related Agreements" of this Report for additional discussion on the Visa derivative and related litigation. 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 December 31, 2016 and 2015 , 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 between levels for the years ended December 31, 2016 and 2015 were inconsequential. December 31, 2016 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: Mortgage-backed securities issued by U.S. Government agencies $ — 3,460 — 3,460 Collateralized mortgage obligations issued by U.S. Government sponsored enterprises — 3,438 — 3,438 State and municipal securities — 426 — 426 Other investments 1,890 100 1,990 Total trading securities 1,890 7,424 — 9,314 Mortgage loans held for sale — 51,545 — 51,545 Investment securities available for sale: U.S. Treasury securities 107,802 — — 107,802 U.S. Government agency securities — 12,993 — 12,993 Mortgage-backed securities issued by U.S. Government agencies — 174,202 — 174,202 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 2,506,340 — 2,506,340 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 890,442 — 890,442 State and municipal securities — 2,794 — 2,794 Equity securities 3,782 — — 3,782 Other investments (1) 3,092 14,952 1,796 19,840 Total investment securities available for sale 114,676 3,601,723 1,796 3,718,195 Private equity investments — — 25,493 25,493 Mutual funds held in rabbi trusts 11,479 — — 11,479 Derivative assets: Interest rate contracts — 17,157 — 17,157 Mortgage derivatives (2) — 3,466 — 3,466 Total derivative assets — 20,623 — 20,623 Liabilities Other liabilities (3) — — 14,000 14,000 Derivative liabilities: Interest rate contracts — 17,531 — 17,531 Visa derivative — — 5,768 5,768 Total derivative liabilities $ — 17,531 5,768 23,299 December 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 $ — 2,922 — 2,922 Collateralized mortgage obligations issued by U.S. Government sponsored enterprises — 1,078 — 1,078 State and municipal securities — 1,097 — 1,097 All other mortgage-backed securities — — — — Total trading securities — 5,097 — 5,097 Mortgage loans held for sale — 59,275 — 59,275 Investment securities available for sale: U.S. Treasury securities 43,357 — — 43,357 U.S. Government agency securities — 13,623 — 13,623 Securities issued by U.S. Government sponsored enterprises — 126,909 — 126,909 Mortgage-backed securities issued by U.S. Government agencies — 210,004 — 210,004 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 2,630,419 — 2,630,419 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 529,597 — 529,597 State and municipal securities — 4,434 — 4,434 Equity securities 9,672 — — 9,672 Other investments (1) 3,073 14,985 1,745 19,803 Total investment securities available for sale 56,102 3,529,971 1,745 3,587,818 Private equity investments — 870 27,148 28,018 Mutual funds held in rabbi trusts 10,664 — — 10,664 Derivative assets: Interest rate contracts — 25,580 — 25,580 Mortgage derivatives (2) — 1,559 — 1,559 Total derivative assets — 27,139 — 27,139 Liabilities Trading account liabilities — 1,032 — 1,032 Derivative liabilities: Interest rate contracts — 26,030 — 26,030 Visa derivative — — 1,415 1,415 Total derivative liabilities $ — 26,030 1,415 27,445 (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. (3 ) Other liabilities include contingent consideration obligation related to Global One acquisition. 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. Twelve Months Ended December 31, (in thousands) 2016 2015 2014 Changes in fair value included in net income: Mortgage loans held for sale $ (667 ) (742 ) 1,399 Mortgage loans held for sale: Fair value 51,545 59,275 63,328 Unpaid principal balance 51,114 58,177 61,488 Fair value less aggregate unpaid principal balance $ 431 1,098 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 year ended December 31, 2016 and 2015 (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 2016 and 2015, Synovus did not have any transfers between levels in the fair value hierarchy. 2016 (in thousands) Investment Securities Available for Sale Private Equity Investments Other Liabilities Visa Derivative Beginning balance, January 1, $ 1,745 27,148 — (1,415 ) Total gains (losses) realized/unrealized: Included in earnings — (1,026 ) — (5,795 ) Unrealized gains included in other comprehensive income 51 — — — Additions — — (14,000 ) — Sales — — — — Issuances — — — — Settlements — (629 ) — 1,442 Amortization of discount/premium — — — — Transfers in and/or out of Level 3 — — — — Ending balance, December 31, $ 1,796 25,493 (14,000 ) (5,768 ) Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31, $ — (1,026 ) — (5,795 ) 2015 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Beginning balance, January 1, $ 1,645 27,367 (1,401 ) Total gains (losses) realized/unrealized: Included in earnings — (219 ) (1,464 ) Unrealized gains included in other comprehensive income 100 — — Additions — — — Sales — — — Issuances — — — Settlements — — 1,450 Amortization of discount/premium — — — Transfers in and/or out of Level 3 — — — Ending balance, December 31, $ 1,745 27,148 (1,415 ) Total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31, $ — (219 ) (1,464 ) 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. As of December 31, 2016 Fair Value Adjustments for the Year Ended December 31, 2016 (in thousands) Level 1 Level 2 Level 3 Impaired loans* $ — — $ 21,742 6,613 Other real estate — — 19,305 1,223 Other assets held for sale — — 12,083 5,715 As of December 31, 2015 Fair Value Adjustments for the Year Ended December 31, 2015 Level 1 Level 2 Level 3 Impaired loans* $ — — $ 15,708 4,144 Other loans held for sale — — 471 31 Other real estate — — 48,166 4,927 Other assets held for sale — — 4,747 1,323 * Impaired loans that are collateral-dependent. Collateral-dependent impaired loans are evaluated for impairment in accordance with the provisions of ASC 310-10-35 using the fair value of the collateral less costs to sell. For loans measured using the estimated fair value of collateral securing these loans less costs to sell, fair value is generally determined based upon appraisals performed by a certified or licensed appraiser using inputs such as absorption rates, capitalization rates, and market comparables, adjusted for estimated selling costs. Management also considers other factors or recent developments, such as changes in absorption rates or market conditions from the time of valuation, and anticipated sales values considering management's plans for disposition, which could result in adjustments to the collateral value estimates indicated in the appraisals. Estimated costs to sell are based on actual amounts for similar assets. These measurements are classified as Level 3 within the valuation hierarchy. Collateral-dependent impaired loans are reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted accordingly based on the same factors identified above. Loans are transferred to other loans held for sale at fair value when Synovus makes the determination to sell specifically identified loans. The fair value of the loans is primarily determined by analyzing the underlying collateral of the loan and the anticipated market prices of similar assets less estimated costs to sell, as well as consideration of the market for loan sales versus the sale of collateral. At the time of transfer, if the estimated fair value is less than the carrying amount, the difference is recorded as a charge-off against the allowance for loan losses. Decreases in the fair value subsequent to the transfer, as well as gains/losses realized from the sale of these assets, are recorded as losses on other loans held for sale, net, as a component of non-interest expense on the consolidated statements of income. ORE consists of properties obtained through a foreclosure proceeding or through an in-substance foreclosure in satisfaction of loans. The fair value of ORE is determined on the basis of current appraisals, comparable sales, and other estimates of fair value obtained principally from independent sources, adjusted for estimated selling costs. At foreclosure, ORE is recorded at the lower of cost or fair value less the estimated cost to sell, which establishes a new cost basis. Subsequent to foreclosure, ORE is evaluated quarterly and reported at fair value less estimated costs to sell, not to exceed the new cost basis, determined on the basis of current appraisals, comparable sales, and other estimates of fair value obtained principally from independent sources, adjusted for estimated selling costs. In the determination of fair value subsequent to foreclosure, management also considers other factors or recent developments, such as changes in absorption rates or market conditions from the time of valuation, and anticipated sales values considering management’s plans for disposition, which could result in an adjustment to lower the fair value estimates indicated in the appraisals. Internally adjusted v

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2016
Summary of Derivative Instruments [Abstract]
Derivative Instruments	Note 17 - 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 December 31, 2016 and 2015 , Synovus had no outstanding interest rate swap contracts utilized to manage interest rate risk related to core banking activities. 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, evaluating other market indicators, and periodic detailed financial reviews. 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 As of December 31, 2016 and 2015, there were no cash flow hedges outstanding. The unamortized deferred net loss balance from previously terminated cash flow hedges at December 31, 2016 and 2015 was $(130) thousand and $(597) thousand , respectively. Synovus expects to reclassify from accumulated other comprehensive income (loss) the remaining $130 thousand to interest expense during the next six months as amortization of deferred losses from prior period cash flow hedge terminations is recognized. Additionally, during 2016, Synovus recognized $196 thousand of the deferred loss balance as a component of loss on early extinguishment of debt, net. Fair Value Hedges As of December 31, 2016 and 2015, there were no fair value hedges outstanding. The unamortized deferred gain balance from previously terminated fair value hedges at December 31, 2016 and 2015 was $873 thousand and $4.0 million , respectively. Synovus expects to reclassify from hedge-related basis adjustment, a component of long-term debt, the remaining $873 thousand of deferred gain balance on previously terminated fair value hedges as a reduction of interest expense during the next six months as amortization of deferred gains is recorded. Additionally, during 2016, Synovus recorded $1.3 million of the unamortized deferred gain balance as a component of loss on early extinguishment of debt, net. 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 counterparties. 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 as a component of non-interest income. As of December 31, 2016 , the notional amount of customer related interest rate derivative financial instruments, including both the customer position and the offsetting position, was $1.32 billion , an increase of $49.2 million compared to December 31, 2015 . 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 $5.8 million and $1.4 million at December 31, 2016 and 2015 , 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 counterpary under the terms of the contract. Management believes that the estimate of Synovus' exposure to the Visa indemnification and fees associated with the Visa derivative is adequate based on current information, including Visa's recent announcements and disclosures. However, future developments in the litigation could require potentially significant changes to Synovus' estimate. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 19 - Visa Shares and Related Agreements" of this Report for further information. 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 December 31, 2016 and 2015 , Synovus had commitments to fund at a locked interest rate, primarily fixed-rate mortgage loans to customers in the amount of $88.2 million and $ 88.8 million , respectively. Fair value adjustments related to these commitments resulted in a gain of $182 thousand and $ 175 thousand for the year ended December 31, 2016 and 2015 , respectively, which were recorded as a component of mortgage banking income in the consolidated statements of income. At December 31, 2016 and 2015 , outstanding commitments to sell primarily fixed-rate mortgage loans amounted to $126.5 million and $ 95.0 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. Fair value adjustments related to these outstanding commitments to sell mortgage loans resulted in gains of $1.7 million and $ 924 thousand for the years ended December 31, 2016 and 2015 , respectively, which were recorded as a component of mortgage banking income in the consolidated statements of income. Collateral Requirements Pursuant to the Dodd-Frank Act, certain derivative transactions have collateral requirements, both at the inception of the trade, and as the value of each derivative position changes. As of December 31, 2016 , collateral totaling $56.1 million of federal funds sold was pledged to the derivative counterparties to comply with collateral requirements. The impact of derivative instruments on the consolidated balance sheets at December 31, 2016 and 2015 is presented below. Fair Value of Derivative Assets Fair Value of Derivative Liabilities December 31, December 31, (in thousands) Location on Consolidated Balance Sheet 2016 2015 Location on Consolidated Balance Sheet 2016 2015 Derivatives not designated as hedging instruments: Interest rate contracts Other assets $ 17,157 25,580 Other liabilities 17,531 26,030 Mortgage derivatives Other assets 3,466 1,559 Other liabilities — — Visa derivative — — Other liabilities 5,768 1,415 Total derivatives not designated as hedging instruments $ 20,623 27,139 23,299 27,445 The pre-tax effect of fair value hedges on the consolidated statements of income for the years ended December 31, 2016 , 2015 and 2014 is presented below. Derivative Location of Gain (Loss) Recognized in Income Gain (Loss) Recognized in Income Twelve Months Ended December 31, (in thousands) 2016 2015 2014 Derivatives not designated as hedging instruments Interest rate contracts (1) Other Non- Interest Income $ 76 44 460 Mortgage derivatives (2) Mortgage Banking Income $ 1,907 1,099 (1,062 ) Total $ 1,983 1,143 (602 ) (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 years ended December 31, 2016 , 2015 , and 2014 , Synovus reclassified $1.8 million , $3.1 million , and $3.1 million , respectively, from hedge-related basis adjustment, a component of long-term debt, as a reduction to interest expense. Additionally, during 2016 and 2015, Synovus reclassified $1.3 million and $495 thousand , respectively, from hedge-related basis adjustment as a reduction to loss on early extinguishment of debt, net. 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.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2016
Variable Interest Entities [Abstract]
Variable Interest Entities	Note 18 - Variable Interest Entities Synovus has a contractual ownership or other interests in certain VIEs for which the fair value of the VIE's net assets may change exclusive of the variable interests. Under ASC 810, Consolidation , Synovus is deemed to be the primary beneficiary and required to consolidate a VIE if it has a variable interest in the VIE that provides it with a controlling financial interest. For such purposes, the determination of whether a controlling financial interest exists is based on whether a single party has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. ASC 810-10-65, as amended, requires continual reconsideration of conclusions reached regarding which interest holder is a VIE's primary beneficiary. Synovus’ involvement with VIEs is discussed below. Synovus consolidates VIEs for which it is deemed the primary beneficiary. Consolidated Variable Interest Entities Rabbi Trusts – Synovus has established certain rabbi trusts related to deferred compensation plans offered to its employees. Synovus contributes employee cash compensation deferrals to the trusts and directs the underlying investments made by the trusts. The assets of these trusts are available to Synovus creditors only in the event that Synovus becomes insolvent. These trusts are considered VIEs because either there is no equity at risk in the trusts or because Synovus provided the equity interest to its employees in exchange for services rendered. While the employees have the ability to direct their funds within the trusts, Synovus is considered the primary beneficiary of the rabbi trusts as it has the ability to direct the underlying investments made by the trusts as well as make funding decisions related to the trusts, the activities that most significantly impact the economic performance of the rabbi trusts. Synovus includes the assets of the rabbi trusts as a component of other assets and a corresponding liability for the associated benefit obligation in other liabilities in its consolidated balance sheets. At December 31, 2016 and 2015 , the aggregate amount of rabbi trust assets and benefit obligation was $ 11.5 million and $ 10.7 million , respectively. Non-consolidated Variable Interest Entities Low Income Housing Tax Credit Partnerships – Synovus and its subsidiary bank, Synovus Bank, make equity investments as a limited partner in various partnerships which are engaged in the development and operation of affordable multi-family housing utilizing the LIHTC pursuant to Section 42 of the Code. The purpose of these investments is to earn a return on the investment and to support community reinvestment initiatives of Synovus Bank. The activities of these LIHTC partnerships are limited to development and operation of multi-family housing that is leased to qualifying residential tenants. These partnerships are generally located in southeastern communities where Synovus has a banking presence and are considered VIEs because Synovus, as the holder of an equity investment at risk, does not have voting or similar rights and does not participate in the management or direct the operations of the partnerships (activities which affect the success of the partnerships). Synovus provides construction lending for certain of the LIHTC partnerships in which it also has an equity investment. Synovus is at risk for the amount of its equity investment plus the outstanding amount of any construction loans in excess of the fair value of the collateral for the loan but has no obligation to fund the operations or working capital of the partnerships. The general partners of these partnerships are considered the primary beneficiaries because they are charged with management responsibility which give them the power to direct the activities that most significantly impact the financial performance of the partnerships, and they are exposed to losses beyond Synovus’ equity investment. At December 31, 2016 and 2015 , the aggregate carrying value of Synovus’ investments in LIHTC partnerships was $26.5 million and $18.9 million , respectively, and the cumulative amount of equity investments was $34.1 million in 2016 and $29.3 million in 2015 . Synovus uses the equity method of accounting for these investments which are included as a component of other assets on Synovus’ consolidated balance sheet. At December 31, 2016 and 2015 , Synovus had $17.4 million and $12.2 million , respectively, commitments to fund equity investments in LIHTC partnerships. Certain Commercial Loans – For certain troubled commercial loans, Synovus restructures the terms of the borrower’s debt in an effort to increase the probability of receipt of amounts contractually due. A TDR generally requires consideration of whether the borrowing entity is a VIE as economic events may have proven that the entity’s equity is not sufficient to permit it to finance its activities without additional subordinated financial support or a restructuring of the terms of its financing. As Synovus does not have the power to direct the activities that most significantly impact such troubled commercial borrowers’ operations, it is not considered the primary beneficiary, even in situations where, based on the size of the financing provided, Synovus is exposed to potentially significant benefits and losses of the borrowing entity. Synovus has no contractual requirements to provide financial support to the borrowing entities beyond certain funding commitments established upon restructuring of the terms of the debt that allow for preparation of the underlying collateral for sale.

Visa Shares and Litigation Expe

Visa Shares and Litigation Expense	12 Months Ended
	Dec. 31, 2016
Visa Shares and Litigation Expense [Abstract]
Visa Shares and Litigation Expense	Note 19 - Visa Shares and Related Agreements Synovus is a member of the Visa USA network and received shares of Visa Class B common stock in exchange for its membership interest in Visa USA in conjunction with the Visa IPO in 2008. Visa members have indemnification obligations with respect to the Covered Litigation. Visa Class B shares are subject to certain restrictions until settlement of the Covered Litigation. As of December 31, 2016 , all of the Covered Litigation had not been settled. Visa has established a litigation escrow to fund settlement of the Covered Litigation. The litigation escrow is funded by proceeds from Visa's conversion of Class B shares to Class A shares. In November 2009, Synovus sold its remaining Visa Class B shares to another Visa USA member financial institution. In conjunction with the sale, 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. As of December 31, 2016 and 2015 , the fair value of the derivative contract was $5.8 million and $1.4 million , 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. For the years ended December 31, 2016 , 2015 and 2014 , Synovus recognized fair value adjustments to the Visa derivative of $5.8 million , $1.5 million and $3.0 million , respectively. Management believes that the estimate of Synovus' exposure to the Visa indemnification and fees associated with the Visa derivative is adequate based on current information, including Visa's recent announcements and disclosures. However, future developments in the litigation could require potentially significant changes to Synovus' estimate.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 20 - Commitments and Contingencies In the normal course of business, Synovus enters into commitments to extend credit such as loan commitments and letters of credit to meet the financing needs of its customers. Synovus uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The contractual amount of these financial instruments represents Synovus' maximum credit risk should the counterparty draw upon the commitment, and should the counterparty subsequently fail to perform according to the terms of the contract. Since many of the commitments are expected to expire without being drawn upon, total commitment amounts do not necessarily represent future cash requirements. Additionally, certain commitments (primarily consumer) can generally be canceled by providing notice to the borrower. The carrying amount of loan commitments and letters of credit closely approximates the fair value of such financial instruments. Carrying amounts include unamortized fee income and, in some instances, allowances for any estimated credit losses from these financial instruments. These amounts are not material to Synovus' consolidated balance sheets. Unfunded lending commitments and letters of credit at December 31, 2016 are presented below. (in thousands) Letters of credit* $ 150,948 Commitments to fund commercial real estate, construction, and land development loans 1,394,162 Unused credit card lines 1,103,431 Commitments under home equity lines of credit 1,096,052 Commitments to fund commercial and industrial loans 4,792,834 Other loan commitments 307,772 Total unfunded lending commitments and letters of credit $ 8,845,199 * Represent the contractual amount net of risk participations of $83 million . Repurchase Obligations for Mortgage Loans Originated for Sale The majority of mortgage loans originated by Synovus are sold to third-party purchasers on a servicing released basis, without recourse, or continuing involvement (Synovus does not retain the servicing rights). These loans are originated and underwritten internally by Synovus personnel and are primarily to borrowers in Synovus’ geographic market footprint. These sales are typically effected as non-recourse loan sales to GSEs and non-GSE purchasers. Each GSE and non-GSE purchaser has specific guidelines and criteria for sellers of loans, and the risk of credit loss with regard to the principal amount of the loans sold is generally transferred to the purchasers upon sale. The purchase agreements require Synovus to make certain representations and warranties regarding the existence and sufficiency of file documentation and the absence of fraud by borrowers or other third parties such as appraisers in connection with obtaining the loan. If it is determined that loans sold were in breach of these representations or warranties, Synovus has obligations to either repurchase the loan at the unpaid principal balance and related investor fees or make the purchaser whole for the economic benefits of the loan. Repurchase activity pursuant to the terms of these representations and warranties has been minimal and has primarily been associated with loans originated from 2005 through 2008. The total accrued liability related to mortgage repurchase claims was $ 2.3 million and $3.2 million at December 31, 2016 and December 31, 2015 , respectively.

Legal Proceedings

Legal Proceedings	12 Months Ended
	Dec. 31, 2016
Legal Proceedings Disclosure [Abstract]
Legal Proceedings	Note 21 - 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. 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 putative class action matters. In addition to actual damages if Synovus does not prevail in asserted legal actions, credit-related litigation could result in additional write-downs or charge-offs of loans, which could adversely affect Synovus' results of operations during the period in which the write-down or charge-off were to occur. 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 December 31, 2016 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, 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 event or 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 is from zero to $12 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 maintains insurance coverage, which may be available to cover legal fees, or potential losses that might be incurred in connection with such legal matters. 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.

Employment Expenses and Benefit

Employment Expenses and Benefit Plans	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Employment Expenses and Benefit Plans	Note 22 - Employment Expenses and Benefit Plans For the years ended December 31, 2016 , 2015, and 2014, Synovus provided a 100% matching contribution on the first 4% of eligible employee 401(k) contributions for a total annual contribution of $10.8 million , $9.9 million , and $9.4 million , respectively. For the years ended December 31, 2016 , 2015, and 2014, Synovus sponsored a stock purchase plan for directors and employees whereby Synovus made contributions equal to 15% of employee and director voluntary contributions, subject to certain maximum contribution limitations. The funds are used to purchase outstanding shares of Synovus common stock. Synovus recorded as expense $826 thousand , $835 thousand , and $880 thousand for contributions to these plans in 2016 , 2015 , and 2014 , respectively. Synovus also has a non-contributory profit sharing plan that covers all eligible employees. The company may contribute a discretionary contribution to this plan on an annual basis. For the years ended December 31, 2016 , 2015 , and 2014 , Synovus did not make contributions to the profit sharing plan.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2016
Share-based Compensation [Abstract]
Share-Based Compensation	Note 23 - 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. 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. At December 31, 2016 , Synovus had a total of 6,432,798 common share equivalents of its authorized but unissued common stock reserved for future grants under the 2013 Omnibus 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. As further discussed below, market restricted share units and performance share units are granted at a defined target level and are compared annually to required market and performance metrics to determine actual units vested and compensation expense. 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. During 2016 , Synovus awarded 350,458 restricted share units to employees and non-employee directors and granted 93,913 market restricted share units and 83,529 performance share units to senior management. The weighted average grant date fair value of the awarded restricted share units, market restricted share units, and performance share units was $26.43 , $26.93 , and $25.95 , per share, respectively. During 2015 , Synovus awarded 321,874 restricted share units to employees and non-employee directors and granted 82,152 market restricted share units and 82,152 performance share units to senior management. The weighted average grant date fair value of the awarded restricted share units, market restricted share units, and performance share units was $28.09 , $29.39 , and $28.06 , per share, respectively, for 2015. During 2014, Synovus awarded 407,374 restricted share units to employees and non-employee directors and granted 90,117 market restricted share units and 67,157 performance share units to senior management. The weighted average grant date fair value of the awarded restricted share units, market restricted share units, and performance share units was $23.69 , $24.30 , and $23.47 , per share, respectively, for 2014. The restricted share units and the market restricted share units granted during 2016 , 2015 , and 2014 contain a service-based vesting period of three years with most awards vesting pro-rata over three years. Share-based Compensation Expense Total share-based compensation expense was $13.6 million , $12.6 million , and $10.2 million for 2016 , 2015 , and 2014 , respectively. The total income tax benefit recognized in the consolidated statements of income for share-based compensation arrangements was approximately $5.0 million , $4.6 million , and $3.9 million for 2016 , 2015 , and 2014 , respectively. No share-based compensation costs have been capitalized for the years ended December 31, 2016 , 2015 , and 2014 . As of December 31, 2016 , unrecognized compensation cost related to the unvested portion of share-based compensation arrangements involving shares of Synovus stock was approximately $15.0 million . Stock Options There were no stock option grants in 2016, 2015, or 2014. A summary of stock option activity and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below. Stock Options 2016 2015 2014 Shares Weighted-Average Exercise Price Shares Weighted-Average Exercise Price Shares Weighted-Average Exercise Price Outstanding at beginning of year 1,741,975 $ 37.88 2,550,046 $ 45.11 3,220,110 $ 49.00 Option rounding due to reverse stock split on May 16, 2014 — — — — 841 49.00 Options exercised (297,225 ) 17.35 (338,808 ) 16.72 (178,176 ) 17.14 Options forfeited (1,597 ) 17.64 (12,825 ) 17.17 (30,146 ) 15.79 Options expired/canceled (469,792 ) 92.62 (456,438 ) 94.56 (462,583 ) 84.88 Options outstanding at end of year 973,361 $ 17.76 1,741,975 $ 37.88 2,550,046 $ 45.11 Options exercisable at end of year 973,361 $ 17.76 1,504,783 $ 41.08 1,870,516 $ 55.40 The aggregate intrinsic value for outstanding and exercisable stock options at December 31, 2016 was $23.2 million . As of December 31, 2016 , the weighted average remaining contractual life was 5.21 years for options outstanding and exercisable. The intrinsic value of stock options exercised during the years ended December 31, 2016 , 2015, and 2014 was $4.7 million , $4.4 million , and $1.3 million , respectively. Cash received from option exercises of common stock for the years ended December 31, 2016 , 2015, and 2014 was $5.2 million , $5.6 million , and $3.0 million , respectively. The total grant date fair value of stock options vested during 2016 , 2015 , and 2014 was $7.4 million , $6.5 million , and $4.9 million , respectively. During 2016, 317,524 stock options with a weighted average exercise price of $93.62 and contractual expiration dates in 2017 and 2018 were canceled without replacement awards. The cancellation resulted in a deferred tax asset write-off totaling $1.7 million , which was recorded as a reduction of additional paid-in capital. Due to the implementation of ASU 2016-09 effective January 1, 2017, if the canceled stock options had remained outstanding through their original contractual expiration dates, the corresponding deferred tax asset write-off totaling $1.7 million would have been recorded as a component of income tax expense during the years ending December 31, 2017 and 2018. Restricted Share Units, Market Restricted Share Units, and Performance Share Units Compensation expense is measured based on the grant date fair value of restricted share units, market restricted share units, and performance share units. The fair value of restricted share units and performance share units is equal to the market price of common stock on the grant date. The fair value of market restricted share units granted was estimated on the date of grant using a Monte Carlo simulation model with the following weighted average assumptions: 2016 2015 2014 Risk-free interest rate 0.81 % 1.05 % 0.70 % Expected stock price volatility 25.7 26.4 39.2 Dividend yield 1.8 1.4 1.2 Simulation period 3.0 years 3.0 years 3.0 years The stock price expected volatility was based on Synovus' historical and implied volatility. The Monte Carlo model estimates fair value based on 100,000 simulations of future share price using a theoretical model of stock price behavior. A summary of restricted share units outstanding and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below (excluding market restricted and performance share units). Restricted Share Units Share Units Weighted-Average grant date Fair Value Outstanding at December 31, 2013 581,677 $ 16.38 Share unit rounding due to reverse stock split on May 16, 2014 258 16.38 Granted 407,374 23.69 Dividend equivalents granted 8,805 24.09 Vested (64,725 ) 15.45 Forfeited (50,566 ) 17.92 Outstanding at December 31, 2014 882,823 19.81 Granted 321,874 28.09 Dividend equivalents granted 9,810 28.09 Vested (428,121 ) 17.48 Forfeited (23,619 ) 24.60 Outstanding at December 31, 2015 762,767 24.57 Granted 350,458 26.43 Dividend equivalents granted 11,105 26.43 Vested (406,496 ) 23.10 Forfeited (12,067 ) 23.96 Outstanding at December 31, 2016 705,767 $ 26.38 The total fair value of restricted share units vested during 2016 , 2015 , and 2014 was $11.4 million , $12.3 million , and $1.6 million , respectively. As of December 31, 2016 , total unrecognized compensation cost related to the foregoing restricted share units was approximately $9.7 million . This cost is expected to be recognized over a weighted average remaining period of 1.42 years. Synovus granted market restricted share units to senior management during the years ended December 31, 2016 , 2015 , and 2014 . 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 a defined target based on Synovus' total shareholder return (TSR). The total fair value of market restricted share units vested during 2016 , 2015 , and 2014 was $2.6 million , $1.4 million , and $398 thousand , respectively. At December 31, 2016 , total unrecognized compensation cost related to market restricted share units was approximately $2.8 million with a weighted average remaining period of 1.48 years. A summary of market restricted share units outstanding and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below. Market Restricted Share Units Share Units Weighted-Average grant date Fair Value Outstanding at December 31, 2013 40,512 $ 24.43 Share unit rounding due to reverse stock split on May 16, 2014 4 24.43 Granted 90,117 24.30 Dividend equivalents granted 1,231 24.09 Quantity change by TSR factor 1,518 24.43 Vested (15,196 ) 24.43 Outstanding at December 31, 2014 118,186 24.33 Granted 82,152 29.39 Dividend equivalents granted 2,221 29.05 Quantity change by TSR factor 4,838 24.33 Vested (49,149 ) 24.34 Outstanding at December 31, 2015 158,248 27.02 Granted 93,913 26.93 Dividend equivalents granted 3,095 26.93 Quantity change by TSR factor 9,970 26.93 Vested (82,817 ) 26.40 Outstanding at December 31, 2016 182,409 $ 27.25 Synovus granted performance share units to senior management during the years ended December 31, 2016 , 2015 , and 2014 . These units vest upon meeting certain service and performance conditions. Return on average assets (ROAA) performance is 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 a defined target based on Synovus' three-year weighted average ROAA (as defined). At December 31, 2016 , total unrecognized compensation cost related to performance share units was approximately $2.4 million with a weighted average remaining period of 1.41 years. A summary of performance share units outstanding and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below. Performance Share Units Share Units Weighted-Average grant date Fair Value Outstanding at December 31, 2013 — $ — Granted 67,157 23.47 Dividend equivalents granted 518 24.09 Outstanding at December 31, 2014 67,675 23.47 Granted 82,152 28.06 Dividend equivalents granted 1,740 28.06 Outstanding at December 31, 2015 151,567 26.01 Granted 83,529 25.95 Dividend equivalents granted 3,384 25.95 Outstanding at December 31, 2016 238,480 $ 25.99 Other Information During 2014, Synovus granted 44,527 salary stock units to senior management, which vested and were expensed immediately upon grant. Compensation expense was initially determined based on the number of salary stock units granted and the market price of common stock at the grant date. Subsequent to the grant date, compensation expense was recorded for changes in common stock market price. The total fair value of salary stock units granted during 2014 was $1.2 million . The salary stock units granted during 2014 were classified as liabilities and were settled in cash on January 15, 2015. Cash paid for taxes due on vesting of employee restricted share units and market restricted share units where restricted share units were withheld to cover taxes was $5.0 million , $5.1 million , $692 thousand for the years ended December 31, 2016 , 2015 , and 2014 , respectively. During 2016 , Synovus recognized a share-based compensation net tax deficiency of $790 thousand associated primarily with expired and canceled stock options. The net deficiency was recorded as a reduction of additional paid-in capital within shareholders' equity. During 2015 , Synovus recognized a net tax benefit of $1.7 million associated with vesting of restricted share units, exercises of stock options, and expired stock options. The net tax benefit was recorded as an increase of additional paid-in capital. During 2014 , Synovus recognized a net tax deficiency of $3.2 million associated primarily with expired stock options. The deficiency was recorded as a reduction of additional paid-in capital. The following table provides aggregate information regarding grants under all Synovus equity compensation plans through December 31, 2016 . Plan Category (a) Number of Securities to be Issued Upon Vesting of Restricted Share Units, Market Restricted Share Units, and Performance Share Units (1) (b) Number of Securities to be Issued Upon Exercise of Outstanding Options (c) Weighted-Average Exercise Price of Outstanding Options in Column (b) (d) Number of Shares Remaining Available for Issuance Excluding Shares Reflected in Columns (a) and (b) Shareholder approved equity compensation plans for shares of Synovus stock 1,126,656 973,361 $ 17.76 6,432,798 (1) Market restricted and performance share units included at defined target levels. Actual shares issued upon vesting may differ based on actual TSR and ROAA over the measurement period.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Note 24 - Income Taxes The components of income tax expense included in the consolidated statements of income for the years ended December 31, 2016 , 2015 , and 2014 as presented: (in thousands) 2016 2015 2014 Current Federal $ 7,329 6,163 5,140 State 5,501 4,424 150 Total current income tax expense 12,830 10,587 5,290 Deferred Federal 117,463 108,877 92,360 State 11,374 13,027 9,660 Total deferred income tax expense 128,837 121,904 102,020 Total income tax expense $ 141,667 132,491 107,310 Note: The table above does not reflect amounts relating to share-based compensation transactions that were charged or credited directly to shareholders' equity. The amounts charged or credited to shareholder's equity for the years ended December 31, 2016 , 2015 , and 2014 were a decrease of $790 thousand , an increase of $1.7 million , and a decrease of $3.2 million , respectively. Income tax expense does not reflect the tax effects of Net unrealized gains (losses) on investment securities available for sale and Post-retirement unfunded health benefits. This information is presented in the Consolidated Statements of Comprehensive Income. Income tax expense as shown in the consolidated statements of income differed from the amounts computed by applying the U.S. federal income tax rate of 35 percent to income before income taxes. A reconciliation of the differences for the years ended December 31, 2016 , 2015 and 2014 as presented: Years Ended December 31, (in thousands) 2016 2015 2014 Income tax expense at statutory federal income tax rate $ 135,957 125,501 105,896 Increase (decrease) resulting from: State income tax expense, net of federal income tax benefit 13,256 12,870 8,014 Bank-owned life insurance (3,402 ) (2,885 ) (2,928 ) Change in valuation allowance (2,055 ) (589 ) (2,273 ) General business tax credits (1,213 ) (1,173 ) (1,123 ) Tax-exempt income (825 ) (835 ) (1,076 ) Other, net (51 ) (398 ) 800 Total income tax expense $ 141,667 132,491 107,310 Effective tax rate 36.5 % 36.9 % 35.5 % Significant portions of the deferred tax assets and liabilities at December 31, 2016 and 2015 are presented: (in thousands) 2016 2015 Deferred tax assets Net operating loss carryforwards $ 167,072 308,617 Allowance for loan losses 100,419 103,884 Tax credit carryforwards 67,031 59,434 Employee benefits and deferred compensation 21,024 21,177 Net unrealized losses on investment securities available for sale 19,413 3,072 Non-performing loan interest 19,137 16,604 Deferred revenue 18,639 16,529 Other 19,759 18,573 Total gross deferred tax assets 432,494 547,890 Less valuation allowance (9,658 ) (11,713 ) Total deferred tax assets 422,836 536,177 Deferred tax liabilities Fixed assets held for sale (8,179 ) (5,985 ) Purchase accounting adjustments (5,765 ) (811 ) Excess tax over financial statement depreciation (5,343 ) (8,564 ) Ownership interest in partnerships (5,242 ) (4,537 ) Other (2,951 ) (4,332 ) Total gross deferred tax liabilities (27,480 ) (24,229 ) Net deferred tax asset $ 395,356 511,948 Note: The table above includes $3.1 million in net deferred tax liabilities from the acquisition of Global One on October 1, 2016. Please refer to Note 2 - "Acquisition" of this Report for more information on the acquisition of Global One. The net decrease in the valuation allowance for the years ended December 31, 2016 and 2015 was $2.1 million and $589 thousand , respectively, and it was due to the expiration of unused state tax credits. Management assesses the realizability of deferred tax assets at each reporting period. The determination of whether a valuation allowance for deferred tax assets is appropriate is subject to considerable judgment and requires an evaluation of all the positive and negative evidence. At December 31, 2016 , the Company is not in a three-year cumulative loss position; accordingly, it does not have significant negative evidence to consider when evaluating the realization of its deferred tax assets. Positive evidence supporting the realization of the Company’s deferred tax assets at December 31, 2016 includes generation of taxable income in 2016 , 2015 , and 2014 , continued improvement in credit quality, record of long-term positive earnings prior to the most recent economic downturn, the Company’s strong capital position, as well as sufficient amounts of projected future taxable income, of the appropriate character, to support the realization of $395.4 million of the Company’s net deferred tax asset at December 31, 2016 . The Company expects to realize its net deferred tax asset of $395.4 million at December 31, 2016 through the reversal of existing taxable temporary differences and projected future taxable income. The valuation allowance of $9.7 million at December 31, 2016 relates to specific state income tax credits that have various expiration dates through the tax year 2019, and are expected to expire before they can be realized. Based on the assessment of all the positive and negative evidence at December 2016 and 2015 , management has concluded that it is more likely than not that the results of future operations will generate sufficient taxable income to realize the deferred tax assets. Synovus expects to realize substantially all of the $395.4 million in net deferred tax assets well in advance of the statutory carryforward period. At December 31, 2016 , $213.9 million of existing deferred tax assets are not related to net operating losses or credits and therefore, have no expiration dates. $126.4 million of the remaining deferred tax assets relate to federal net operating losses which expire in years beginning in 2031 through 2036. Additionally, $40.7 million of the deferred tax assets relate to state net operating losses which will expire in installments annually through the tax year 2036. Tax credit carryforwards at December 31, 2016 include federal alternative minimum tax credits totaling $43.0 million which have an unlimited carryforward period. Other federal and state tax credits at December 31, 2016 total $24.0 million and have expiration dates through the tax year 2036. Federal and state NOL and tax credit carryforwards as of December 31, 2016 are summarized in the following table. Tax Carryforwards As of December 31, 2016 (in thousands) Expiration Dates Deferred Tax Asset Balance Valuation Allowance Net Deferred Tax Asset Balance Pre-Tax Earnings Necessary to Realize Net operating losses - federal (3) 2031-2036 $ 126,351 — 126,351 361,004 General business credits - federal 2028-2036 8,383 — 8,383 NA (1) Net operating losses - states 2025-2029 13,244 — 13,244 1,370,624 Net operating losses - states (3) 2030-2036 36,148 — 36,148 1,165,627 Other credits - states 2017-2020 12,422 (9,658 ) 2,764 NA (1) Other credits - states 2021-2026 2,239 — 2,239 NA (1) Alternative minimum tax credits - federal None 43,037 — 43,037 NA (2) Other credits - states None 950 — 950 NA (1) (1) N/A indicates credits are not measured on a pre-tax earnings basis. (2) Alternative minimum tax credits can be carried forward indefinitely. (3) $3.0 million of acquired NOLs from Global One acquisition have a utilization limitation. Synovus is subject to income taxation in the United States and various state jurisdictions. Synovus' federal income tax return is filed on a consolidated basis, while state income tax returns are filed on both a consolidated and separate entity basis. Currently, there are no years for which Synovus filed a federal income tax return that are under examination by the IRS. Synovus is no longer subject to income tax examinations by the IRS for years before 2012, and excluding certain limited exceptions, Synovus is no longer subject to income tax examinations by state and local income tax authorities for years before 2012. However, amounts reported as net operating losses and tax credit carryovers from closed tax periods remain subject to review by most taxing authorities. Although Synovus is unable to determine the ultimate outcome of current and future examinations, Synovus believes that the liability recorded for uncertain tax positions is adequate. A reconciliation of the beginning and ending amount of unrecognized income tax benefits is as follows (unrecognized state income tax benefits are not adjusted for the federal income tax impact). Years Ended December 31, (in thousands) 2016 2015 2014 Balance at January 1, $ 12,745 13,023 912 Additions based on income tax positions related to current year — — — Additions for income tax positions of prior years * 1,811 8 12,318 Additions from acquisition 608 — — Deductions for income tax positions of prior years — — (52 ) Statute of limitation expirations (419 ) (286 ) (155 ) Settlements — — — Balance at December 31, $ 14,745 12,745 13,023 *Includes deferred tax benefits that could reduce future tax liabilities. Accrued interest and penalties related to unrecognized income tax benefits are included as a component of income tax expense. Accrued interest and penalties on unrecognized income tax benefits totaled $38 thousand , $96 thousand , and $109 thousand as of December 31, 2016 , 2015 and 2014, respectively. Unrecognized income tax benefits as of December 31, 2016 , 2015 and 2014 that, if recognized, would affect the effective income tax rate totaled $9.9 million , $8.3 million and $8.5 million (net of the federal benefit on state income tax issues). Synovus had approximately $25 thousand and $63 thousand accrued interest and penalties at December 31, 2016 and 2015, respectively. Synovus expects that $80 thousand of uncertain income tax positions will be either settled or resolved during the next twelve months.

Condensed Financial Information

Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only)	Note 25 - Condensed Financial Information of Synovus Financial Corp. (Parent Company only) Condensed Balance Sheets December 31, (in thousands) 2016 2015 Assets Cash due from bank subsidiary $ 234,339 369,564 Funds due from other depository institutions (1) 19,911 19,911 Investment in consolidated bank subsidiary, at equity 3,319,980 3,339,233 Investment in consolidated nonbank subsidiaries, at equity 71,335 71,350 Notes receivable from nonbank subsidiaries 35,200 67,000 Other assets 101,346 105,513 Total assets $ 3,782,111 3,972,571 Liabilities and Shareholders' Equity Liabilities: Long-term debt $ 834,252 960,185 Other liabilities 19,935 12,190 Total liabilities 854,187 972,375 Shareholders’ equity: Series C Preferred Stock 125,980 125,980 Common stock 142,026 140,592 Additional paid-in capital 3,028,405 2,989,981 Treasury stock (664,595 ) (401,511 ) Accumulated other comprehensive loss, net (55,659 ) (29,819 ) Retained earnings 351,767 174,973 Total shareholders’ equity 2,927,924 3,000,196 Total liabilities and shareholders’ equity $ 3,782,111 3,972,571 (1) Restricted as to withdrawal. Condensed Statements of Income Years Ended December 31, (in thousands) 2016 2015 2014 Income Cash dividends received from Synovus Bank $ 325,000 199,904 90,626 Cash distributions received from Synovus Bank — 25,096 91,374 Interest income 2,565 8,865 14,262 Other income 4,595 (337 ) (932 ) Total income 332,160 233,528 195,330 Expenses Interest expense 52,831 46,585 45,726 Other expenses 20,652 10,516 10,337 Total expenses 73,483 57,101 56,063 Income before income taxes and equity in undistributed income (loss) of subsidiaries 258,677 176,427 139,267 Allocated income tax benefit (25,628 ) (18,808 ) (16,491 ) Income before equity in undistributed income (loss) of subsidiaries 284,305 195,235 155,758 Equity in undistributed income (loss) of subsidiaries (37,521 ) 30,847 39,491 Net income 246,784 226,082 195,249 Dividends on preferred stock 10,238 10,238 10,238 Net income available to common shareholders $ 236,546 215,844 185,011 Condensed Statements of Comprehensive Income December 31, 2016 December 31, 2015 December 31, 2014 (in thousands) Before-tax Amount Tax (Expense) Benefit Net of Tax Amount Before-tax Amount Tax (Expense) Benefit Net of Tax Amount Before-tax Amount Tax (Expense) Benefit Net of Tax Amount Net income $ 388,451 (141,667 ) 246,784 358,573 (132,491 ) 226,082 302,559 (107,310 ) 195,249 Reclassification adjustment for losses realized in net income on cash flow hedges 467 (180 ) 287 521 (201 ) 320 448 (173 ) 275 Reclassification adjustment for net gains realized in net income on investment securities available for sale (5,763 ) 2,219 (3,544 ) — — — — — — Net unrealized gains on investment securities available for sale 2,358 (908 ) 1,450 2,908 (1,120 ) 1,788 21 (8 ) 13 Other comprehensive (loss) gain of bank subsidiary (39,080 ) 15,047 (24,033 ) (31,420 ) 12,098 (19,322 ) 46,122 (17,757 ) 28,365 Other comprehensive (loss) income $ (42,018 ) 16,178 (25,840 ) (27,991 ) 10,777 (17,214 ) 46,591 (17,938 ) 28,653 Comprehensive income $ 220,944 208,868 223,902 Condensed Statements of Cash Flows Years Ended December 31, (in thousands) 2016 2015 2014 Operating Activities Net income $ 246,784 226,082 195,249 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed loss (income) of subsidiaries 37,521 (30,847 ) (39,491 ) Deferred income tax expense (benefit) 17,989 (2,506 ) (5,041 ) Net increase (decrease) in other liabilities 7,746 (1,709 ) (22,323 ) Net (increase) decrease in other assets (9,214 ) 1,045 14,226 Other, net (1,648 ) (178 ) (2,041 ) Net cash provided by operating activities 299,178 191,887 140,579 Investing Activities Outlays for business combinations (3,408 ) — — Net decrease in short-term notes receivable from non-bank subsidiaries 31,800 10,000 39,000 Net cash provided by investing activities 28,392 10,000 39,000 Financing Activities Dividends paid to common and preferred shareholders (69,663 ) (65,592 ) (53,043 ) Repurchases and agreements to repurchase shares of common stock (263,084 ) (199,221 ) (88,113 ) Repayments on long-term debt (130,048 ) (48,553 ) — Proceeds from issuance of long-term debt — 246,644 — Net cash used in financing activities (462,795 ) (66,722 ) (141,156 ) (Decrease) increase in cash and funds due from banks (135,225 ) 135,165 38,423 Cash and funds due from banks at beginning of year 389,475 254,310 215,887 Cash and funds due from banks at end of year $ 254,250 389,475 254,310 For the years ended December 31, 2016 , 2015, and 2014, the Parent Company paid income taxes of $9.5 million , $8.7 million , and $4.8 million , respectively. For the years ended December 31, 2016 , 2015 , and 2014 , the Parent Company paid interest of $53.1 million , $46.9 million , and $46.9 million , respectively.

Supplemental Financial Data

Supplemental Financial Data	12 Months Ended
	Dec. 31, 2016
Supplemental Income Statement Elements [Abstract]
Supplemental Financial Data	Note 26 - Supplemental Financial Data Components of other non-interest income and other operating expenses in excess of 1% of total interest income and total non-interest income for any of the respective years are as follows: Years Ended December 31, (in thousands) 2016 2015 2014 Litigation settlement/contingency expenses $ 2,511 5,110 12,812 Insurance and bonds 12,023 12,514 11,801

Summary of Quarterly Financial

Summary of Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Data [Abstract]
Summary of Quarterly Financial Data (Unaudited)	Summary of Quarterly Financial Data (Unaudited) Presented below is a summary of the unaudited consolidated quarterly financial data for the years ended December 31, 2016 and 2015 . 2016 (in thousands, except per share data) Fourth Quarter Third Quarter Second Quarter First Quarter Interest income $ 264,534 256,554 252,393 249,323 Net interest income 233,530 226,007 221,449 218,193 Provision for loan losses 6,259 5,671 6,693 9,377 Income before income taxes 108,068 102,620 94,031 83,730 Income tax expense 39,519 37,375 33,574 31,199 Net income 68,549 65,245 60,457 52,531 Net income available to common shareholders $ 65,990 62,686 57,898 49,972 Net income per common share, basic $ 0.54 0.51 0.46 0.39 Net income per common share, diluted 0.54 0.51 0.46 0.39 2015 Fourth Quarter (1) Third Quarter Second Quarter First Quarter Interest income $ 242,814 238,093 233,654 231,401 Net interest income 212,620 207,790 203,644 203,263 Provision for loan losses 5,021 2,956 6,636 4,397 Income before income taxes 90,741 93,986 88,034 85,812 Income tax expense 32,342 36,058 32,242 31,849 Net income 58,398 57,928 55,792 53,963 Net income available to common shareholders $ 55,839 55,369 53,233 51,404 Net income per common share, basic $ 0.43 0.42 0.40 0.38 Net income per common share, diluted 0.43 0.42 0.40 0.38 (1) The results for the three months ended December 31, 2015 include an out-of-period adjustment that increased the provision for loan losses by $12.9 million , resulting from the correction of an error that arose in 2012 which management identified during the fourth quarter of 2015. The correction increased the provision for loan losses by $13.3 million for the full year 2015.

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents consist of cash and due from banks.
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 December 31, 2016 and 2015 , interest bearing funds with the Federal Reserve Bank included $130 million and $117.3 million , respectively, on deposit to meet Federal Reserve Bank reserve requirements. Interest earning deposits with banks include $5.6 million at December 31, 2016 and $2.2 million at December 31, 2015 , which is pledged as collateral in connection with certain letters of credit. Federal funds sold include $56.1 million at December 31, 2016 and $65.9 million at December 31, 2015 , 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.
Trading Account Assets	Trading account assets, which are primarily held on a short-term basis for the purpose of selling at a profit, consist of debt and equity securities and are reported at fair value. Fair value adjustments and fees from trading account activities are included as a component of other fee income on the consolidated statements of income. Gains and losses realized from the sale of trading account assets are determined by specific identification and are included as a component of other fee income on the trade date. Interest income on trading assets is reported as a component of interest income on the consolidated statements of income.
Mortgage Loans Held for Sale and Mortgage Banking Income	Mortgage Loans Held for Sale Mortgage loans held for sale are recorded at fair value. Fair value is derived from a hypothetical bulk sale model used to estimate the exit price of the loan in a loan sale. The bid pricing convention is used for loan pricing for similar assets. The valuation model is based upon forward settlements of a pool of loans of similar coupon, maturity, product, and credit attributes. The inputs to the model are continuously updated with available market and historical data. As the loans are sold in the secondary market, the valuation model produces an estimate of fair value that represents the highest and best use of the loans in Synovus' principal market. Mortgage Banking Income Mortgage banking income consists primarily of origination and ancillary fees on loans originated for sale, and gains and losses from the sale of mortgage loans. Mortgage loans are generally sold servicing released, without recourse or continuing involvement, and meet ASC 860-10-65 criteria for sale accounting.
Other Loans Held for Sale	Loans are transferred to other loans held for sale at fair value when Synovus makes the determination to sell specifically identified loans. The fair value of the loans is primarily determined by analyzing the underlying collateral of the loan and the anticipated market prices of similar assets less estimated costs to sell. At the time of transfer, if the estimated fair value is less than the carrying amount, the difference is recorded as a charge-off against the allowance for loan losses. Decreases in the fair value subsequent to the transfer, as well as gains/losses realized from the sale of these assets, are recorded as losses on other loans held for sale, net, as a component of non-interest expense on the consolidated statements of income.
Investment Securities Available for Sale	Investment securities available for sale are carried at fair value with unrealized gains and losses, net of the related tax effect, excluded from earnings and reported as a separate component of shareholders' equity within accumulated other comprehensive income (loss) until realized. Synovus performs a quarterly assessment of its investment securities available for sale to determine if the decline in fair value of a security below its amortized cost is deemed to be other-than-temporary. Factors included in the assessment 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. Other-than-temporary impairment losses are recognized on securities when: (1) the holder has an intention to sell the security; (2) it is more likely than not that the security will be required to be sold prior to recovery; or (3) the holder does not expect to recover the entire amortized cost basis of the security. Other-than-temporary impairment losses 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 (loss). Premiums and discounts are amortized or accreted over the life of the related security as an adjustment to yield using the effective interest method and prepayment assumptions. Actual prepayment experience is reviewed periodically and the timing of the accretion and amortization is adjusted accordingly. Interest income on securities available for sale is recorded on the accrual basis. Realized gains and losses for securities are included in investment securities gains (losses), net, on the consolidated statements of income and are derived using the specific identification method, on a trade date basis.
Loans and Interest Income on Loans	Loans are reported at principal amounts outstanding less amounts charged off, net of deferred fees and expenses. Interest income and deferred fees, net of expenses on loans, are recognized on a level yield basis. Non-accrual Loans Loans on which the accrual of interest has been discontinued are designated as non-accrual loans. Accrual of interest is discontinued on loans when reasonable doubt exists as to the full collection of interest or principal, or when loans become contractually past due for 90 days or more as to either interest or principal, in accordance with the terms of the loan agreement, unless they are both well-secured and in the process of collection. When a loan is placed on non-accrual status, previously accrued and uncollected interest is generally reversed as an adjustment to interest income on loans. Interest payments received on non-accrual loans are generally recorded as a reduction of principal. As payments are received on non-accruing loans, interest income can be recognized on a cash basis; however, there must be an expectation of full repayment of the remaining recorded principal balance. The remaining portion of this payment is recorded as a reduction to principal. Loans are generally returned to accruing status when they are brought fully current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to both principal and interest, and the borrower has sustained repayment performance under the terms of the loan agreement for a reasonable period of time (generally six months). Impaired Loans Impaired loans are loans for which it is probable that Synovus will not be able to collect all amounts due according to the contractual terms of the loan agreements and all loans modified in a troubled debt restructuring (TDR). Other than TDRs, impaired loans do not include smaller-balance homogeneous loans that are collectively evaluated for impairment, which consist of most retail loans and commercial loan relationships less than $1.0 million . Impairment is measured on a discounted cash flow method based upon the loan's contractual effective interest rate, or at the loan's observable market price, or at the fair value of the collateral, less costs to sell if the loan is collateral-dependent. Interest income on non-accrual impaired loans is recognized as described above under "non-accrual loans." Impaired accruing loans generally consist of those TDRs for which management has concluded that the collectability of the loan is not in doubt. At December 31, 2016 , substantially all non-accrual impaired loans were collateral-dependent and secured by real estate. For impairment measured using the estimated fair value of collateral less costs to sell, fair value is estimated using appraisals performed by a certified or licensed appraiser. Management also considers other factors or recent developments, such as selling costs and anticipated sales values, taking into account management's plans for disposition, which could result in adjustments to the fair value estimates indicated in the appraisals. The assumptions used in determining the amount of the impairment are subject to significant judgment. Use of different assumptions, for example, changes in the fair value of the collateral or management's plans for disposition could have a significant impact on the amount of impairment. Under the discounted cash flow method, impairment is recorded as a specific reserve with a charge-off for any portion of the impairment considered a confirmed loss. The reserve is reassessed each quarter and adjusted as appropriate based on changes in estimated cash flows. Where guarantors are determined to be a source of repayment, an assessment of the guarantee is required. This guarantee assessment would include, but not be limited to, factors such as type and feature of the guarantee, consideration for the guarantor's financial strength and capacity to service the loan in combination with the guarantor's other financial obligations as well as the guarantor's willingness to assist in servicing the loan. Troubled Debt Restructurings When borrowers are experiencing financial difficulties, Synovus may, in order to assist the borrowers in repaying the principal and interest owed to Synovus, make certain modifications to the borrower's loan. All loan modifications, renewals, and refinances are evaluated for TDR classification. All TDRs are considered to be impaired loans, and the amount of impairment, if any, is determined in accordance with ASC 310-10-35 . Concessions provided by Synovus in a TDR are generally made in order to assist borrowers so that debt service is not interrupted and to mitigate the potential for loan losses. A number of factors are reviewed when a loan is renewed, refinanced, or modified, including cash flows, collateral values, guarantees, and loan structures. Concessions are primarily in the form of providing a below market interest rate given the borrower's credit risk to assist the borrower in managing cash flows, an extension of the maturity of the loan generally for less than one year, or 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). Insignificant periods of reduction of principal and/or interest payments, or one time deferrals of three months or less, are generally not considered to be financial concessions. Further, it is generally Synovus' practice not to defer principal and/or interest for more than twelve months. Non-accruing TDRs may generally be returned to accrual status if there has been a period of performance, usually at least a six month sustained period of repayment performance in accordance with the agreement. Consistent with regulatory guidance, a TDR will generally no longer be reported as a TDR after a period of performance and after the loan was reported as a TDR at a year-end reporting date, and if at the time of the modification, the interest rate was at market, considering the credit risk associated with the borrower, and no principal was forgiven.
Allowance for Loan Losses	The allowance for loan losses represents management's best estimate of probable losses inherent in the funded loan porfolio. Changes to the allowance are recorded through a provision for loan losses and reduced by loans charged-off, net of recoveries. Impaired loans are generally evaluated on a loan by loan basis with specific reserves, if any, recorded as appropriate. Specific reserves are determined based on ASC 310-10-35, which provides for measurement of a loan's impairment based on one of three methods. If the loan is collateral-dependent, then the fair value of the loan's collateral, less estimated selling costs, are compared to the loan's carrying amount to determine impairment. Other methods of measuring a loan's impairment include the present value of the expected future cash flows of the loan, or if available, the observable market price of the loan. Synovus considers the pertinent facts and circumstances for each impaired loan when selecting the appropriate method to measure impairment, and quarterly evaluates each selection to ensure its continued appropriateness and evaluates the reasonableness of specific reserves, if any. For loans that are not considered impaired, the allocated allowance for loan losses is determined based upon Expected Loss (EL) factors, which are applied to groupings of specific loan types by loan risk ratings. The EL is determined based upon a probability of default (PD), which is the probability that a borrower, segregated by loan type and loan risk grade, will default, and loss given default (LGD), which is the estimate of the amount of net loss in the event of default. The groupings of the loans into loan categories are determined based upon the nature of the loan types and the level of inherent risk associated with the various loan categories. The loan groupings are further segregated based upon the individual loan risk ratings, as described below. The EL factors applied in the methodology are periodically re-evaluated and adjusted to reflect changes in historical loss levels or other risks. Allocated EL factors may also be adjusted, as necessary, for certain qualitative factors that in management's judgment are necessary to reflect losses incurred in the portfolio. Qualitative factors that management considers in the analysis include: • changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses • changes in the volume and severity of past due loans, the volume of non-accrual loans, and the volume and severity of adversely classified or grade loans • loan growth • effects of changes in credit concentrations • experience, ability, and depth of lending management, loan review personnel, and other relevant staff • changes in the quality of the loan review function • national and local economic trends and conditions • value of underlying collateral for collateral-dependent loans • other external factors such as the effects for the current competitive, legal, and regulatory environment The adjusted EL factors by portfolio are then adjusted by a loss emergence period for each loan type. A loss emergence period represents the amount of time between when a loss event first occurs to when it is charged off. The loss emergence period was determined for each loan type based on the Company's historical experience and is validated at least annually. Commercial Loans - Risk Ratings Synovus utilizes two primary methods for risk assessment of the commercial loan portfolio: Single Risk Rating Assessment and Dual Risk Rating (DRR) Assessment. The single and dual risk ratings are based on the borrowers' credit risk profile, considering factors such as debt service history, current and estimated prospective cash flow information, collateral supporting the credit, source of repayment as well as other variables, as appropriate. Each loan is assigned a risk rating during its initial approval process. For single risk rated loans, this process begins with a loan rating recommendation from the loan officer responsible for originating the loan. Commercial single risk rated loans are graded on a 9-point scale. Single risk ratings six through nine are defined consistent with the bank regulatory classifications of special mention, substandard, doubtful, and loss, respectively. The primary determinants of the risk ratings for commercial single risk rated loans are the reliability of the primary source of repayment and the borrower's expected performance (i.e., the likelihood that the borrower will be able to service its obligations in accordance with the terms). Expected performance will be based upon full analysis of the borrower's historical financial results, current financial strength and future prospects, which includes any external drivers. For dual risk rated loans, this process begins with scoring the loan for a rating during its initial approval process. Synovus began utilizing a dual risk rating methodology for certain components of its C&I loan portfolio in 2013 and extended the DRR methodology to certain income-producing real estate loans in 2014 and 2015. The DRR includes sixteen PD categories and nine categories for estimating losses given an event of default. The result is an EL rate established for each borrower. The loan rating is subject to approvals from other members of management, regional credit and/or loan committees depending on the size of the loan and loan's credit attributes. Loan ratings are regularly re-evaluated based upon annual scheduled credit reviews or on a more frequent basis if determined prudent by management. Additionally, an independent loan review function evaluates Synovus' risk rating processes on a continuous basis. Management continues to implement the DRR methodology for additional components of the commercial loan portfolio. The timing of future implementations will depend upon completion of applicable data analysis and model assessment. Approximately $7.6 billion , or 31.8% , of the total loan portfolio was rated using the DRR methodology at year-end 2016. Retail Loans – Risk Ratings Retail loans are generally assigned a risk rating on a 6-point scale at the time of origination based on credit bureau scores, with a loan grade of 1 assigned as the lowest level of risk and a loan grade of 6 as the highest level of risk. At 90-119 days past due, a loan grade of 7-substandard rating is applied and at 120 days past due, the loan is generally downgraded to grade 9-loss and is generally charged-off. The credit bureau-based ratings are updated at least semi-annually and the ratings based on the past due status are updated monthly. Unallocated Allowance for Loan Losses The unallocated component of the allowance for loan losses is not a significant component of the ALLL, but would be utilized to provide for certain environmental and economic factors that affect the inherent risk of loss in the entire loan portfolio that are not fully captured in the allocated allowance for loan losses. On a quarterly basis, management updates its analysis and consideration of these factors and determines the impact, if any, on the allowance for loan losses and the provision for loan losses for each respective period.
Premises and Equipment	Premises and equipment, including bank owned branch locations and leasehold improvements, are reported at cost, less accumulated depreciation and amortization, which are computed using the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are depreciated over the shorter of the estimated useful life or the remainder of the lease term. Synovus reviews long-lived assets, such as premises and equipment, for impairment whenever events and circumstances indicate that the carrying amount of an asset may not be recoverable.
Goodwill and Other Intangible Assets	Goodwill represents the excess purchase price over the fair value of identifiable net assets of acquired businesses. Goodwill is tested for impairment at the reporting unit level on an annual basis and as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. Synovus reviews goodwill for impairment as of June 30 th and at interim periods if indicators of impairment exist. Significant judgment is applied when goodwill is assessed for impairment. This judgment includes developing cash flow projections, selecting appropriate discount rates, identifying relevant market comparables, incorporating general economic and market conditions, and selecting an appropriate control premium. The selection and weighting of the various fair value techniques may result in a higher or lower fair value. Judgment is applied in determining the weighting that are most representative of fair value. Other intangible assets relate primarily to existing borrower relationships, trade name, and a distribution network resulting from a business acquisition. These intangible assets are amortized using straight line methods based on the remaining lives of the assets. Amortization periods range from eight to ten years. Amortization periods for intangible assets are monitored to determine if events and circumstances require such periods to be reduced. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of the intangible assets is measured by a comparison of the carrying amount of the asset to future undiscounted cash flows expected to be generated by the asset. If such assets are considered impaired, the amount of the impairment to be recognized is measured by the amount by which the carrying value of the assets exceeds the fair value of the assets based on the discounted expected future cash flows to be generated by the assets.
Other Real Estate	Other Real Estate (ORE) consists of properties obtained through a foreclosure proceeding or through an in-substance foreclosure in satisfaction of loans. A loan is classified as an in-substance foreclosure when Synovus has taken possession of the collateral regardless of whether formal foreclosure proceedings have taken place. At foreclosure, ORE is recorded at the lower of cost or fair value less estimated selling costs, which establishes a new cost basis. Subsequent to foreclosure, ORE is evaluated quarterly and reported at fair value less estimated selling costs, not to exceed the new cost basis, determined by review of current appraisals, as well as the review of comparable sales and other estimates of fair value obtained principally from independent sources, adjusted for estimated selling costs. Management also considers other factors or recent developments such as changes in absorption rates or market conditions from the time of the latest appraisal received or previous re-evaluation performed, and anticipated sales values considering management's plans for disposition, which could result in an adjustment to lower the fair value estimates indicated in the appraisals. At the time of foreclosure or initial possession of collateral, any excess of the loan balance over the fair value of the real estate held as collateral, less costs to sell, is recorded as a charge against the allowance for loan losses. Revenue and expenses from ORE operations as well as gains or losses on sales are recorded as foreclosed real estate expense, net, a component of non-interest expense on the consolidated statements of income. Subsequent declines in fair value are recorded on a property-by-property basis through use of a valuation allowance within ORE on the consolidated balance sheets and valuation adjustment account in foreclosed real estate expense, net, a component of non-interest expense on the consolidated statements of income. Synovus' objective is to dispose of ORE properties in a timely manner and to maximize net sale proceeds. Synovus has a centralized managed assets division, with the specialized skill set to facilitate this objective. While there is not a defined timeline for their sale, ORE properties are actively marketed through unaffiliated third parties.
Other Assets	Other assets include accrued interest receivable and other significant balances as described below. Cash Surrender Value of Bank-Owned Life Insurance Investments in bank-owned life insurance policies on certain current and former officers of Synovus are recorded at the net realizable value of the policies. Net realizable value is the cash surrender value of the policies less any applicable surrender charges and any policy loans. Synovus has not borrowed against the cash surrender value of these policies. Changes in the cash surrender value of the policies are recognized as a component of other non-interest income in the consolidated statements of income. Investments in Federal Reserve Bank and Federal Reserve Home Loan Bank Stock On November 17, 2016, Synovus Bank made an investment of $97.3 million in Federal Reserve Bank capital stock and became a member of the Federal Reserve System. Synovus held stock in the Federal Reserve Bank totaling $98.6 million at December 31, 2016 and $1.2 million at December 31, 2015 . Synovus also held stock in the FHLB of Atlanta totaling $71.3 million at December 31, 2016 and $67.1 million at December 31, 2015 . The Federal Reserve Bank and FHLB stocks are recorded at amortized cost. The investment in FHLB stock is required for membership in the FHLB system and in relation to the level of FHLB outstanding borrowings. SBA/Government Guaranteed Loans (GGL) Servicing Assets, net Synovus has retained servicing responsibilities on sold SBA/GGL loans and receives annual servicing fees on the outstanding loan balances. SBA/GGL servicing rights are accounted for using the amortization method. A servicing asset is established at fair value at the time of the sale using a discounted future cash flow model. The servicing asset is then amortized in other non-interest expense. Private Equity Investments Private equity investments are recorded at fair value on the consolidated balance sheets with realized and unrealized gains and losses recorded on the consolidated statements of income (as a component of other non-interest income). The private equity investments in which Synovus holds a limited partner interest consist of funds that invest in privately held companies. For privately held companies in the fund, the general partner estimates the fair value of the company. The estimated fair value of the company is the estimated fair value as an exit price the fund would receive if it were to sell the company in the marketplace. The fair value of the fund's underlying investments is estimated through the use of valuation models, such as option pricing or a discounted cash flow model. Valuation factors, such as a company's financial performance against budget or milestones, last price paid by investors, with consideration given on whether financing is provided by insiders or unrelated new investors, public market comparables, liquidity of the market, industry and economic trends, and changes in management or key personnel, are used in the determination of estimated fair value.
Derivative Instruments	Synovus’ risk management policies emphasize the management of interest rate risk within acceptable guidelines. Synovus’ objective in maintaining these policies is to limit volatility in net interest income arising from changes in interest rates. Risks to be managed include both fair value and cash flow risks. Utilization of derivative financial instruments provides a valuable tool to assist in the management of these risks. All derivative instruments are recorded on the consolidated balance sheets at their respective fair values, as components of other assets and other liabilities. The accounting for changes in fair value (i.e., unrealized gains or losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, on the reason for holding it. If certain conditions are met, entities may elect to designate a derivative instrument as a hedge of exposures to changes in fair values, cash flows, or foreign currencies. If the hedged exposure is a fair value exposure, the unrealized gain or loss on the derivative instrument is recognized in earnings in the period of change, together with the offsetting unrealized loss or gain on the hedged item attributable to the risk being hedged as a component of other non-interest income on the consolidated statements of income. If the hedged exposure is a cash flow exposure, the effective portion of the gain or loss on the derivative instrument is reported initially as a component of accumulated other comprehensive income (loss), net of the tax impact, and subsequently reclassified into earnings when the hedged transaction affects earnings. Any amounts excluded from the assessment of hedge effectiveness, as well as the ineffective portion of the gain or loss on the derivative instrument, are reported in earnings immediately as a component of other non-interest income on the consolidated statements of income. If the derivative instrument is not designated as a hedge, the gain or loss on the derivative instrument is recognized in earnings as a component of other non-interest income on the consolidated statements of income in the period of change. In 2005, Synovus entered into certain forward starting swap contracts to hedge the cash flow risk of certain forecasted interest payments on a forecasted debt issuance. Upon the determination to issue debt, Synovus was potentially exposed to cash flow risk due to changes in market interest rates prior to the placement of the debt. The forward starting swaps allowed Synovus to hedge this exposure. Upon placement of the debt, these swaps were cash settled concurrent with the pricing of the debt. The effective portion of the cash flow hedge included in accumulated other comprehensive income is being amortized over the life of the debt issue as an adjustment to interest expense. Synovus also holds derivative instruments, which consist of rate lock agreements related to expected funding of fixed-rate mortgage loans to customers (interest rate lock commitments) and forward commitments to sell mortgage-backed securities and individual fixed-rate mortgage loans. Synovus’ objective in obtaining the forward commitments is to mitigate the interest rate risk associated with the interest rate lock commitments and the mortgage loans that are held for sale. Both the interest rate lock commitments and the forward commitments are reported at fair value, with adjustments recorded in current period earnings in mortgage banking income. Synovus also enters into interest rate swap agreements to facilitate the risk management strategies of certain 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 with any unrealized gain or loss recorded in current period earnings in other non-interest income. These instruments, and their offsetting positions, are recorded in other assets and other liabilities on the consolidated balance sheets.
Non-interest Income	Service Charges on Deposit Accounts Service charges on deposit accounts consist of NSF fees, account analysis fees, and other service charges on deposits which consist primarily of monthly account fees. NSF fees are recognized at the time when the account overdraft occurs in accordance with regulatory guidelines. Account analysis fees consist of fees charged to certain commercial demand deposit accounts based upon account activity (and reduced by a credit which is based upon cash levels in the account). These fees, as well as monthly account fees, are recorded under the accrual method of accounting. Fiduciary and Asset Management Fees Fiduciary and asset management fees are generally determined based upon fair values of assets under management as of a specified date during the period. These fees are recorded under the accrual method of accounting as the services are performed. Brokerage and Investment Banking Revenue Brokerage revenue consists primarily of commission income, which represents the spread between buy and sell transactions processed, and net fees charged to customers on a transaction basis for buy and sell transactions processed. Commission income is recorded on a trade-date basis. Brokerage revenue also includes portfolio management fees, which represent monthly fees charged on a contractual basis to customers for the management of their investment portfolios and are recorded under the accrual method of accounting. Investment banking revenue represents fees for services arising from securities offerings or placements in which Synovus acts as an agent. It also includes fees earned from providing advisory services. Revenue is recognized at the time the underwriting is completed and the revenue is reasonably determinable. Bankcard Fees Bankcard fees consist primarily of interchange fees earned, net of fees paid, on debit card and credit card transactions. Net fees are recognized into income as they are collected.
Advertising Costs	Advertising costs are expensed as incurred and recorded as a component of non-interest expense.
Income Taxes	Synovus is a domestic corporation that files a consolidated federal income tax return with its wholly-owned subsidiaries and files state income tax returns on a consolidated or separate entity basis with the various taxing jurisdictions based on its taxable presence. The current income tax accrual or receivable is an estimate of the amounts owed to or due from taxing authorities in which Synovus conducts business. It also includes increases and decreases in the amount of taxes payable for uncertain tax positions reported in tax returns for the current and/or prior years. Synovus uses the asset and liability method to account for future income taxes expected to be paid or received (i.e., deferred income taxes). Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement (GAAP) carrying amounts of existing assets and liabilities and their respective tax bases, including operating losses and tax credit carryforwards. The deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in income tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is required for deferred tax assets if, based on available evidence, it is more likely than not that all or some portion of the asset will not be realized. In making this assessment, all sources of taxable income available to realize the deferred tax asset are considered, including taxable income in prior carryback years, future reversals of existing temporary differences, tax planning strategies, and future taxable income exclusive of reversing temporary differences and carryforwards. The predictability that future taxable income, exclusive of reversing temporary differences, will occur is the most subjective of these four sources. Changes in the valuation allowance are recorded through income tax expense. Significant estimates used in accounting for income taxes relate to the valuation allowance for deferred tax assets, estimates of the realizability of income tax credits, utilization of net operating losses, the determination of taxable income, and the determination of temporary differences between book and tax bases. Synovus accrues tax liabilities for uncertain income tax positions based on current assumptions regarding the expected outcome by weighing the facts and circumstances available at the reporting date. If related tax benefits of a transaction are not more likely than not of being sustained upon examination, Synovus will accrue a tax liability or reduce a deferred tax asset for the expected tax impact associated with the transaction. Events and circumstances may alter the estimates and assumptions used in the analysis of its income tax positions and, accordingly, Synovus' effective tax rate may fluctuate in the future. Synovus recognizes accrued interest and penalties related to unrecognized income tax benefits as a component of income tax expense.
Share-based Compensation	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. Synovus' share-based compensation costs associated with employee grants are recorded as a component of salaries and other personnel expense in the consolidated statements of income. Share-based compensation costs associated with grants made to non-employee directors of Synovus are recorded as a component of other operating expenses. Share-based compensation expense for service-based awards that contain a graded vesting schedule is recognized net of estimated forfeitures for plan participants on a straight-line basis over the requisite service period for the entire award. The non-employee director restricted share units become fully vested and transferable upon the earlier to occur of the completion of three years of service and the date the holder reaches age 72. Thus, share-based compensation expense for non-employee awards is recognized over the shorter of three years or the time to age 72.
Earnings Per Share	Basic net income per common share is computed by dividing net income available to common shareholders 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. All share and per share amounts for all periods presented in this Report reflect the one-for-seven reverse stock split, which was effective on May 16, 2014.
Fair Value Measurements and Disclosures	Fair value estimates are made at a specific point in time, based on relevant market information and other information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale, at one time, the entire holdings of a particular financial instrument. Because no market exists for a portion of the financial instruments, fair value estimates are also based on judgments regarding estimated cash flows, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Synovus employs independent third-party pricing services to provide fair value estimates for its investment securities available for sale, trading account assets, and derivative financial instruments. Fair values for fixed income investment securities and certain derivative financial instruments are typically the prices supplied by either the third-party pricing service or an unrelated counterparty, which utilize quoted market prices, broker/dealer quotations for identical or similar securities, and/or inputs that are observable in the market, either directly or indirectly, for substantially similar securities. Level 1 securities are typically exchange quoted prices. Level 2 securities are typically matrix priced by a third-party pricing service to calculate the fair value. Such fair value measurements consider observable data, such as market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayments speeds, credit information, and the respective terms and conditions for debt instruments. Level 3 instruments' 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. Management uses various validation procedures to validate the prices received from pricing services and quotations received from dealers are reasonable for each relevant financial instrument, including reference to relevant broker/dealer quotes or other market quotes and a review of valuations and trade activity of comparable securities. Consideration is given to the nature of the quotes (e.g., indicative or firm) and the relationship of recently evidenced market activity to the prices provided by the third-party pricing service. Further, management also employs the services of an additional independent pricing firm as a means to verify and confirm the fair values of its primary independent pricing firm. Understanding the third-party pricing service's valuation methods, assumptions and inputs used by the firm is an important part of the process of determining that reasonable and reliable fair values are being obtained. Management evaluates quantitative and qualitative information provided by the third-party pricing services to assess whether they continue to exhibit the high level of expertise and internal controls that management relies upon. Fair value estimates are based on existing financial instruments on the consolidated balance sheet, without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets and liabilities that are not considered financial instruments include deferred income taxes, premises and equipment, equity method investments, goodwill and other intangible assets. In addition, the income tax ramifications related to the realization of the unrealized gains and losses on available for sale investment securities can have a significant effect on fair value estimates and have not been considered in any of the estimates.
Contingent Liabilities and Legal Costs	Synovus estimates its contingent liabilities with respect to outstanding legal matters based on information currently available to management, management’s estimates about the probability of outcomes of each case and the advice of legal counsel. Management accrues an estimated loss from a loss contingency when information available indicates that it is probable that a loss has been incurred and the amount of the loss can be reasonably estimated. In addition, it must be probable that one or more future events will occur confirming the fact of the loss. Significant judgment is required in making these estimates and management must make assumptions about matters that are highly uncertain. Accordingly, the actual loss may be more or less than the current estimate. 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. As there are further developments, Synovus will reassess these legal matters and the related potential liabilities and will revise, when needed, its estimate of contingent liabilities. Legal costs, including attorney fees, incurred in connection with pending litigation and other loss contingencies are expensed as incurred.
Recently Adopted and Issued Accounting Standards Updates	Recently Adopted Accounting Standards Updates During 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis , which became effective for Synovus on January 1, 2016. ASU 2015-02 modifies the analysis that companies must perform in order to determine whether a legal entity should be consolidated. ASU 2015-02 also simplifies current consolidation rules by reducing the number of consolidation models; placing more emphasis on risk of loss when determining a controlling financial interest; reducing the frequency of the application of related-party guidance when determining a controlling financial interest in a VIE; and changing consolidation conclusions for public and private companies in several industries that typically make use of limited partnerships or VIEs. Adoption of ASU 2015-02 did not have an impact on Synovus' consolidated financial statements. Recently Issued Accounting Standards Updates The following ASUs will be implemented effective January 1, 2017 or later: ASU 2016-13, Financial Instruments--Credit Losses. On June 16, 2016, the FASB issued the new guidance related to credit losses. The new guidance replaces the existing incurred loss impairment guidance with a single expected credit loss methodology. The new guidance will require management’s estimate of credit losses over the full remaining expected life of loans and other financial instruments. For Synovus, the standard will apply to loans, unfunded loan commitments, and debt securities available for sale. The standard is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption is permitted on January 1, 2019. Upon adoption, Synovus will record a cumulative effect adjustment to retained earnings as of the beginning of the reporting period of adoption. Synovus has begun its implementation efforts which are led by a cross-functional steering committee. Management expects that the allowance for loan losses will be higher under the new standard; however, management is still in the process of determining the magnitude of the increase and the impact on its financial statements and regulatory capital ratios. Additionally, the extent of the increase on the allowance for loan losses will depend upon the composition of the loan portfolio upon adoption of the standard, as well as economic conditions and forecasts at that time. ASU 2016-09, Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting. In March 2016, the FASB issued ASU 2016-09, which simplifies several aspects of the accounting for employee share-based payment transactions for both public and nonpublic entities, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The new guidance includes a requirement to record all of the tax effects related to share-based payments at settlement (or expiration) through the income statement. Currently, tax benefits in excess of compensation cost (“windfalls”) and tax deficiencies (“shortfalls”) are recorded in equity. For Synovus, this ASU will be effective for annual reporting periods beginning after December 15, 2016. Management expects that the ASU will create some quarterly income tax expense volatility, but the annual impact is not expected to be significant with only 973,361 stock options outstanding at December 31, 2016. However, Synovus’ future stock price and changes in the stock price versus the grant date stock price will determine the amount of future tax “windfalls” or “shortfalls” reflected in income tax expense associated with exercises of stock options and vesting of outstanding restricted share units, market restricted share units, and performance share units. ASU 2016-02, Leases. In February 2016, the FASB issued ASU 2016-02, its new standard on lease accounting. ASU 2016-02 introduces a lessee model that brings most leases on the balance sheet. Under the new standard, all lessees will recognize a right-of-use asset and a lease liability for all leases, including operating leases, with a lease term greater than 12 months. From a lessor perspective, the accounting model is largely unchanged, though the new standard does include certain targeted improvements to align, where necessary, lessor accounting with the lessee accounting model and the revenue recognition guidance in ASC Topic 606 (those related to evaluating when profit can be recognized). For Synovus, the impact of this ASU will primarily relate to its accounting and reporting of leases as a lessee. The new ASU will be effective for Synovus beginning January 1, 2019 (prior periods will be restated so prior years are comparable). Early adoption is permitted. Management currently estimates that the financial statement impact from the implementation of the new lease accounting standard will not be significant. ASU 2014-09, Revenue from Contracts with Customers . ASU 2014-09 establishes a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The standard is intended to increase comparability across industries and jurisdictions. The core principle of the revenue model is that a company will recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. On April 29, 2015, the FASB issued a proposal to delay the effective date of ASU 2014-09, Revenue from Contracts with Customers, for public and non-public companies . The proposed new effective date will be annual reporting periods beginning after December 15, 2017, and the interim periods within that year, for public business entities. As such, for Synovus, the ASU will be effective on January 1, 2018, for both its interim and annual reporting periods. This proposal represents a one-year deferral from the original effective date. The proposed new effective date guidance will allow early adoption for all entities (i.e., both public business entities and other entities) as of the original effective date for public business entities, which was annual reporting periods beginning after December 15, 2016, and the interim periods within that year. Management is currently evaluating the impact of this ASU on Synovus’ consolidated financial statements. Synovus' initial scoping exercise determined that approximately 50% of non-interest income revenue streams are in the scope of these updates. The standard is expected to potentially impact ORE sales, interchange revenue, credit card loyalty programs, asset management fees, treasury management services revenue, and miscellaneous fees; however, the overall financial statement impact for Synovus is not expected to be significant. Extensive new disclosures will be required, including disaggregation of total revenue, information about performance obligations, changes in contract asset and liability account balances between periods, and information about key judgments and estimates and policy decisions regarding revenue recognition.
Reclassifications	Prior years' consolidated financial statements are reclassified whenever necessary to conform to the current year's presentation.

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Schedule of Business Acquisition	Global One October 1, 2016 (in thousands) Preliminary Fair Value Assets acquired: Cash and due from banks $ 9,554 Commercial and industrial loans (1) 356,665 Goodwill (2) 35,247 Other intangible assets 13,400 Other assets 2,742 Total assets acquired $ 417,608 Liabilities assumed: Notes payable (3) $ 358,560 Contingent consideration 14,000 Deferred tax liability, net 3,145 Other liabilities 11,903 Total liabilities assumed $ 387,608 Consideration paid $ 30,000 Cash paid $ 3,408 Fair value of common stock issued 26,592 (1) The unpaid principal balance of the loans was $356.7 million . (2) The goodwill is not expected to be deductible for tax purposes. (3) The unpaid principal balance of the notes payable was $357.0 million .

Restructuring Charges (Tables)

Restructuring Charges (Tables)	12 Months Ended
	Dec. 31, 2016
Restructuring Charges [Abstract]
Schedule of Restructuring and Related Costs	For the years ended December 31, 2016 , 2015 , and 2014 total restructuring charges consist of the following components: Years Ended December 31, (in thousands) 2016 2015 2014 Severance charges $ — — 7,246 Lease termination charges 6 (3 ) 4,808 Asset impairment charges 8,107 229 7,530 Gain on sale of assets held for sale, net — (401 ) (766 ) Professional fees and other charges 154 211 1,767 Total restructuring charges $ 8,267 36 20,585 The following table presents aggregate activity associated with accruals that resulted from the restructuring charges recorded during the years ended December 31, 2016, 2015, and 2014: (in thousands) Severance Charges Lease Termination Charges Total Balance at December 31, 2013 $ 1,572 1,383 2,955 Accruals for efficiency initiatives 7,246 4,808 12,054 Payments (5,527 ) (652 ) (6,179 ) Balance at December 31, 2014 3,291 5,539 8,830 Accruals for efficiency initiatives — (3 ) (3 ) Payments (1,361 ) (849 ) (2,210 ) Balance at December 31, 2015 1,930 4,687 6,617 Accruals for efficiency initiatives — 6 6 Payments (1,849 ) (725 ) (2,574 ) Balance at December 31, 2016 $ 81 3,968 4,049

Investment Securities Availab39

Investment Securities Available for Sale (Tables)	12 Months Ended
	Dec. 31, 2016
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 December 31, 2016 and 2015 are summarized below. December 31, 2016 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 108,221 225 (644 ) 107,802 U.S. Government agency securities 12,727 266 — 12,993 Mortgage-backed securities issued by U.S. Government agencies 174,440 1,116 (1,354 ) 174,202 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,543,495 5,416 (42,571 ) 2,506,340 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 905,789 1,214 (16,561 ) 890,442 State and municipal securities 2,780 14 — 2,794 Equity securities 919 2,863 — 3,782 Other investments 20,247 — (407 ) 19,840 Total investment securities available for sale $ 3,768,618 11,114 (61,537 ) 3,718,195 December 31, 2015 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 43,125 232 — 43,357 U.S. Government agency securities 13,087 536 — 13,623 Securities issued by U.S. Government sponsored enterprises 126,520 389 — 126,909 Mortgage-backed securities issued by U.S. Government agencies 209,785 1,340 (1,121 ) 210,004 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,645,107 7,874 (22,562 ) 2,630,419 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 530,426 2,396 (3,225 ) 529,597 State and municipal securities 4,343 92 (1 ) 4,434 Equity securities 3,228 6,444 — 9,672 Other investments 20,177 — (374 ) 19,803 Total investment securities available for sale $ 3,595,798 19,303 (27,283 ) 3,587,818
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 December 31, 2016 and December 31, 2015 are presented below. December 31, 2016 Less than 12 Months 12 Months or Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses U.S. Treasury securities 64,023 644 — — 64,023 644 Mortgage-backed securities issued by U.S. Government agencies 128,121 1,240 3,626 114 131,747 1,354 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,123,181 42,571 — — 2,123,181 42,571 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 682,492 15,653 24,801 908 707,293 16,561 Other investments 14,952 48 4,888 359 19,840 407 Total $ 3,012,769 60,156 33,315 1,381 3,046,084 61,537 December 31, 2015 Less than 12 Months 12 Months or Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Mortgage-backed securities issued by U.S. Government agencies 122,626 639 18,435 482 141,061 1,121 Mortgage-backed securities issued by U.S. Government sponsored enterprises 1,656,194 12,874 489,971 9,688 2,146,165 22,562 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 196,811 963 72,366 2,262 269,177 3,225 State and municipal securities — — 50 1 50 1 Other investments 14,985 15 4,818 359 19,803 374 Total $ 1,990,616 14,491 585,640 12,792 2,576,256 27,283
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 December 31, 2016 (in thousands) Within One Year 1 to 5 Years 5 to 10 Years More Than 10 Years No Stated Maturity Total Amortized Cost U.S. Treasury securities $ 18,435 89,786 — — — 108,221 U.S. Government agency securities 999 5,929 5,799 — — 12,727 Mortgage-backed securities issued by U.S. Government agencies — — 14,345 160,095 — 174,440 Mortgage-backed securities issued by U.S. Government sponsored enterprises 154 86 624,561 1,918,694 — 2,543,495 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — — 905,789 — 905,789 State and municipal securities 110 240 — 2,430 — 2,780 Equity securities — — — — 919 919 Other investments — — 15,000 2,000 3,247 20,247 Total amortized cost $ 19,698 96,041 659,705 2,989,008 4,166 3,768,618 Fair Value U.S. Treasury securities $ 18,435 89,367 — — — 107,802 U.S. Government agency securities 1,021 6,019 5,953 — — 12,993 Mortgage-backed securities issued by U.S. Government agencies — — 14,784 159,418 — 174,202 Mortgage-backed securities issued by U.S. Government sponsored enterprises 158 88 624,216 1,881,878 — 2,506,340 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — — 890,442 — 890,442 State and municipal securities 110 240 — 2,444 — 2,794 Equity securities — — — — 3,782 3,782 Other investments — — 14,952 1,796 3,092 19,840 Total fair value $ 19,724 95,714 659,905 2,935,978 6,874 3,718,195
Summary of Sales Transactions in the Investment Securities Available-for-Sale Portfolio	OTTI charges of $88 thousand respectively, are included in gross realized losses for the year 2014 . The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale. (in thousands) 2016 2015 2014 Proceeds from sales of investment securities available for sale $ 968,606 347,954 20,815 Gross realized gains on sales (1) $ 9,586 $ 4,356 $ 1,419 Gross realized losses on sales (3,575 ) (1,587 ) (88 ) Investment securities gains, net $ 6,011 2,769 1,331 (1) Includes $1.4 million in gains in 2016 from the transfer of $1.9 million of investment securities available for sale to trading account assets.

Loans And Allowance For Loan 40

Loans And Allowance For Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Loans and Allowance for Loan Losses [Abstract]
Loans Outstanding by Classification	Loans outstanding, by classification, at December 31, 2016 and 2015 are summarized below. December 31, (in thousands) 2016 2015 Investment properties $ 5,932,619 5,751,631 1-4 family properties 1,023,821 1,129,156 Land acquisition 409,534 513,981 Total commercial real estate 7,365,974 7,394,768 Commercial, financial and agricultural 6,915,927 6,453,180 Owner-occupied 4,636,016 4,318,950 Total commercial and industrial 11,551,943 10,772,130 Home equity lines 1,617,265 1,689,914 Consumer mortgages 2,296,604 1,938,683 Credit cards 232,413 240,851 Other retail loans 818,183 423,318 Total retail 4,964,465 4,292,766 Total loans 23,882,382 22,459,664 Deferred fees and costs, net (25,991 ) (30,099 ) Total loans, net of deferred fees and costs $ 23,856,391 22,429,565
Schedule of Current, Accruing Past Due, and Nonaccrual Loans	The following is a summary of current, accruing past due, and non-accrual loans by class as of December 31, 2016 and 2015 . Current, Accruing Past Due, and Non-accrual Loans December 31, 2016 ( 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 $ 5,924,225 2,958 — 2,958 5,436 5,932,619 1-4 family properties 1,000,590 4,962 161 5,123 18,108 1,023,821 Land acquisition 401,346 1,117 — 1,117 7,071 409,534 Total commercial real estate 7,326,161 9,037 161 9,198 30,615 7,365,974 Commercial, financial and agricultural 6,846,591 9,542 720 10,262 59,074 6,915,927 Owner-occupied 4,601,356 17,913 244 18,157 16,503 4,636,016 Total commercial and industrial 11,447,947 27,455 964 28,419 75,577 11,551,943 Home equity lines 1,585,228 10,013 473 10,486 21,551 1,617,265 Consumer mortgages 2,265,966 7,876 81 7,957 22,681 2,296,604 Credit cards 229,177 1,819 1,417 3,236 — 232,413 Other retail loans 809,419 5,771 39 5,810 2,954 818,183 Total retail 4,889,790 25,479 2,010 27,489 47,186 4,964,465 Total loans $ 23,663,898 61,971 3,135 65,106 153,378 23,882,382 (1) December 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 $ 5,726,307 2,284 — 2,284 23,040 5,751,631 1-4 family properties 1,105,914 6,300 103 6,403 16,839 1,129,156 Land acquisition 495,542 639 32 671 17,768 513,981 Total commercial real estate 7,327,763 9,223 135 9,358 57,647 7,394,768 Commercial, financial and agricultural 6,391,036 12,222 785 13,007 49,137 6,453,180 Owner-occupied 4,293,308 5,254 95 5,349 20,293 4,318,950 Total commercial and industrial 10,684,344 17,476 880 18,356 69,430 10,772,130 Home equity lines 1,667,552 5,882 0 5,882 16,480 1,689,914 Consumer mortgages 1,907,644 8,657 134 8,791 22,248 1,938,683 Credit cards 237,742 1,663 1,446 3,109 — 240,851 Other retail loans 418,337 2,390 26 2,416 2,565 423,318 Total retail 4,231,275 18,592 1,606 20,198 41,293 4,292,766 Total loans $ 22,243,382 45,291 2,621 47,912 168,370 22,459,664 (2) (1) Total before net deferred fees and costs of $26.0 million . (2) Total before net deferred fees and costs of $30.1 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 December 31, 2016 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,843,433 54,486 34,700 — — 5,932,619 1-4 family properties 932,340 51,623 32,853 7,005 — 1,023,821 Land acquisition 360,017 31,360 17,897 260 — 409,534 Total commercial real estate 7,135,790 137,469 85,450 7,265 — 7,365,974 Commercial, financial and agricultural 6,642,648 126,268 140,425 6,445 141 (3) 6,915,927 Owner-occupied 4,462,420 60,856 111,330 1,410 — 4,636,016 Total commercial and industrial 11,105,068 187,124 251,755 7,855 141 11,551,943 Home equity lines 1,589,199 — 22,774 2,892 2,400 (3) 1,617,265 Consumer mortgages 2,271,916 — 23,268 1,283 137 (3) 2,296,604 Credit cards 230,997 — 637 — 779 (4) 232,413 Other retail loans 814,844 — 3,233 42 64 (3) 818,183 Total retail 4,906,956 — 49,912 4,217 3,380 4,964,465 Total loans $ 23,147,814 324,593 387,117 19,337 3,521 23,882,382 (5) December 31, 2015 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,560,595 114,705 76,331 — — 5,751,631 1-4 family properties 995,903 64,325 61,726 7,202 — 1,129,156 Land acquisition 436,835 46,208 30,574 364 — 513,981 Total commercial real estate 6,993,333 225,238 168,631 7,566 — 7,394,768 Commercial, financial and agricultural 6,184,179 152,189 100,658 13,330 2,824 (3) 6,453,180 Owner-occupied 4,118,631 78,490 121,272 98 459 (3) 4,318,950 Total commercial and industrial 10,302,810 230,679 221,930 13,428 3,283 10,772,130 Home equity lines 1,666,586 — 20,456 1,206 1,666 (3) 1,689,914 Consumer mortgages 1,910,649 — 26,041 1,700 293 (3) 1,938,683 Credit cards 239,405 — 480 — 966 (4) 240,851 Other retail loans 418,929 — 4,315 — 74 (3) 423,318 Total retail 4,235,569 — 51,292 2,906 2,999 4,292,766 Total loans $ 21,531,712 455,917 441,853 23,900 6,282 22,459,664 (6) (1) Includes $256.6 million and $303.7 million of Substandard accruing loans at December 31, 2016 and December 31, 2015 , 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 $26.0 million . (6) Total before net deferred fees and costs of $30.1 million .
Schedule of Allowances for Loan Losses and Recorded Investment in Loans	The following table details the change in the allowance for loan losses by loan segment for the years ended December 31, 2016 , 2015 and 2014 . Allowance for Loan Losses and Recorded Investment in Loans As Of and For The Year Ended December 31, 2016 (in thousands) Commercial Real Estate Commercial & Industrial Retail Unallocated Total Allowance for loan losses Beginning balance $ 87,133 122,989 42,374 — 252,496 Charge-offs (18,216 ) (25,039 ) (14,705 ) — (57,960 ) Recoveries 15,226 9,071 4,925 — 29,222 Provision for loan losses (2,327 ) 18,757 11,570 — 28,000 Ending balance $ 81,816 125,778 44,164 — 251,758 Ending balance: individually evaluated for impairment 7,916 8,384 1,811 — 18,111 Ending balance: collectively evaluated for impairment $ 73,900 117,394 42,353 — 233,647 Loans Ending balance: total loans (1) $ 7,365,974 11,551,943 4,964,465 — 23,882,382 Ending balance: individually evaluated for impairment 91,410 120,560 37,526 — 249,496 Ending balance: collectively evaluated for impairment $ 7,274,564 11,431,383 4,926,939 — 23,632,886 As Of and For The Year Ended December 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 (13,998 ) (22,583 ) (20,758 ) — (57,339 ) Recoveries 13,644 8,611 7,253 — 29,508 Provision for loan losses (13,984 ) 18,851 14,143 — 19,010 Ending balance $ 87,133 122,989 42,374 — 252,496 Ending balance: individually evaluated for impairment 18,969 10,477 989 — 30,435 Ending balance: collectively evaluated for impairment $ 68,164 112,512 $ 41,385 $ — 222,061 Loans Ending balance: total loans (2) $ 7,394,768 10,772,130 4,292,766 — 22,459,664 Ending balance: individually evaluated for impairment 157,958 105,599 38,243 — 301,800 Ending balance: collectively evaluated for impairment $ 7,236,810 10,666,531 4,254,523 — 22,157,864 As Of and For The Year Ended December 31, 2014 (in thousands) Commercial Real Estate Commercial & Industrial Retail Unallocated Total Allowance for loan losses Beginning balance $127,646 115,435 41,479 23,000 307,560 Allowance for loan losses of sold Memphis loans (281 ) (398 ) (340 ) — (1,019 ) Charge-offs (49,716 ) (38,941 ) (24,881 ) — (113,538 ) Recoveries 11,787 14,628 8,068 — 34,483 Provision for loan losses 12,035 27,386 17,410 (23,000 ) 33,831 Ending balance $ 101,471 118,110 41,736 — 261,317 Ending balance: individually evaluated for impairment 21,755 10,451 1,270 — 33,476 Ending balance: collectively evaluated for impairment $ 79,716 107,659 40,466 — 227,841 Loans Ending balance: total loans (3) $ 6,926,602 10,267,719 3,934,168 — 21,128,489 Ending balance: individually evaluated for impairment 251,536 146,026 44,586 — 442,148 Ending balance: collectively evaluated for impairment $ 6,675,066 10,121,693 3,889,582 — 20,686,341 (1) Total before net deferred fees and costs of $26.0 million . (2) Total before net deferred fees and costs of $30.1 million . (3) Total before net deferred fees and costs of $30.8 million .
Schedule of Impaired Loans	Below is a detailed summary of impaired loans (including accruing TDRs) by class as of December 31, 2016 and 2015 . Impaired Loans (including accruing TDRs) December 31, 2016 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded Investment properties $ 748 793 — 5,384 — 1-4 family properties 1,850 5,847 — 1,461 — Land acquisition 892 4,335 — 2,958 — Total commercial real estate 3,490 10,975 — 9,803 — Commercial, financial and agricultural 17,958 20,577 — 6,321 — Owner-occupied 5,508 7,377 — 8,394 — Total commercial and industrial 23,466 27,954 — 14,715 — Home equity lines 1,051 1,051 — 1,045 — Consumer mortgages 744 814 — 870 — Credit cards — — — — — Other retail loans — — — — — Total retail 1,795 1,865 — 1,915 — Total 28,751 40,794 — 26,433 — With allowance recorded Investment properties 32,729 32,729 2,267 42,836 1,699 1-4 family properties 38,972 38,978 4,754 47,806 1,098 Land acquisition 16,219 16,219 895 17,449 486 Total commercial real estate 87,920 87,926 7,916 108,091 3,283 Commercial, financial and agricultural 43,386 45,913 5,687 51,968 1,218 Owner-occupied 53,708 53,942 2,697 52,300 1,946 Total commercial and industrial 97,094 99,855 8,384 104,268 3,164 Home equity lines 9,638 9,638 971 9,668 432 Consumer mortgages 20,953 19,834 673 20,993 1,014 Credit cards — — — — — Other retail loans 5,140 5,140 167 5,062 303 Total retail 35,731 34,612 1,811 35,723 1,749 Total 220,745 222,393 18,111 248,082 8,196 Total Investment properties 33,477 33,522 2,267 48,220 1,699 1-4 family properties 40,822 44,825 4,754 49,267 1,098 Land acquisition 17,111 20,554 895 20,407 486 Total commercial real estate 91,410 98,901 7,916 117,894 3,283 Commercial, financial and agricultural 61,344 66,490 5,687 58,289 1,218 Owner-occupied 59,216 61,319 2,697 60,694 1,946 Total commercial and industrial 120,560 127,809 8,384 118,983 3,164 Home equity lines 10,689 10,689 971 10,713 432 Consumer mortgages 21,697 20,648 673 21,863 1,014 Credit cards — — — — — Other retail loans 5,140 5,140 167 5,062 303 Total retail 37,526 36,477 1,811 37,638 1,749 Total impaired loans $ 249,496 263,187 18,111 274,515 8,196 December 31, 2015 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded Investment properties $ 10,051 12,946 — 11,625 — 1-4 family properties 1,507 5,526 — 2,546 — Land acquisition 8,551 39,053 — 13,897 — Total commercial real estate 20,109 57,525 — 28,068 — Commercial, financial and agricultural 4,393 7,606 — 5,737 — Owner-occupied 8,762 11,210 — 14,657 — Total commercial and industrial 13,155 18,816 — 20,394 — Home equity lines 1,030 1,030 — 573 — Consumer mortgages 814 941 — 995 — Credit cards — — — — — Other retail loans — — — — — Total retail 1,844 1,971 — 1,568 — Total 35,108 78,312 — 50,030 — With allowance recorded Investment properties 62,305 62,305 10,070 73,211 2,131 1-4 family properties 51,376 51,376 6,184 61,690 1,618 Land acquisition 24,168 24,738 2,715 34,793 936 Total commercial real estate 137,849 138,419 18,969 169,694 4,685 Commercial, financial and agricultural 42,914 44,374 8,339 43,740 1,125 Owner-occupied 49,530 49,688 2,138 55,323 1,814 Total commercial and industrial 92,444 94,062 10,477 99,063 2,939 Home equity lines 9,575 9,575 206 8,318 346 Consumer mortgages 22,173 23,297 651 26,044 1,229 Credit cards — — — — — Other retail loans 4,651 4,651 132 5,105 323 Total retail 36,399 37,523 989 39,467 1,898 Total 266,692 270,004 30,435 308,224 9,522 Total Investment properties 72,356 75,251 10,070 84,836 2,131 1-4 family properties 52,883 56,902 6,184 64,236 1,618 Land acquisition 32,719 63,791 2,715 48,690 936 Total commercial real estate 157,958 195,944 18,969 197,762 4,685 Commercial, financial and agricultural 47,307 51,980 8,339 49,477 1,125 Owner-occupied 58,292 60,898 2,138 69,980 1,814 Total commercial and industrial 105,599 112,878 10,477 119,457 2,939 Home equity lines 10,605 10,605 206 8,891 346 Consumer mortgages 22,987 24,238 651 27,039 1,229 Credit cards — — — — — Other retail loans 4,651 4,651 132 5,105 323 Total retail 38,243 39,494 989 41,035 1,898 Total impaired loans $ 301,800 348,316 30,435 358,254 9,522
Troubled Debt Restructurings	The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the years ended December 31, 2016 , 2015 , and 2014 that were reported as accruing or non-accruing TDRs. TDRs by Concession Type Year Ended December 31, 2016 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties 4 $ — 1,825 3,518 5,343 1-4 family properties 39 — 5,499 1,488 6,987 Land acquisition 14 — — 4,099 4,099 Total commercial real estate 57 — 7,324 9,105 16,429 Commercial, financial and agricultural 63 — 17,509 7,160 24,669 Owner-occupied 9 — 7,884 550 8,434 Total commercial and industrial 72 — 25,393 7,710 33,103 Home equity lines 5 — 225 123 348 Consumer mortgages 7 — 413 51 464 Credit cards — — — — — Other retail loans 28 — 394 2,256 2,650 Total retail 40 — 1,032 2,430 3,462 Total loans 169 $ — 33,749 19,245 52,994 (1) (1) As a result of these loans being reported as TDRs, there were no net charge-offs recorded during 2016 . TDRs by Concession Type Year Ended December 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 11 $ — 25,052 6,973 32,025 1-4 family properties 43 14,823 4,667 2,763 22,253 Land acquisition 12 — 614 1,532 2,146 Total commercial real estate 66 14,823 30,333 11,268 56,424 Commercial, financial and agricultural 91 29 3,191 6,477 9,697 Owner-occupied 10 — 3,417 2,064 5,481 Total commercial and industrial 101 29 6,608 8,541 15,178 Home equity lines 53 — 2,826 2,905 5,731 Consumer mortgages 15 — 1,011 895 1,906 Credit cards — — — — — Other retail loans 27 — 444 703 1,147 Total retail 95 — 4,281 4,503 8,784 Total loans 262 $ 14,852 41,222 24,312 80,386 (1) (1) As a result of these loans being reported as TDRs, there were net charge-offs of $4.0 million recorded during 2015 . TDRs by Concession Type Year Ended December 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 15 $ — 8,423 5,813 14,236 1-4 family properties 68 — 6,611 6,492 13,103 Land acquisition 16 2,338 4,783 2,688 9,809 Total commercial real estate 99 2,338 19,817 14,993 37,148 Commercial, financial and agricultural 89 60 10,066 21,141 31,267 Owner-occupied 18 — 23,404 14,862 38,266 Total commercial and industrial 107 60 33,470 36,003 69,533 Home equity lines 20 — 2,335 451 2,786 Consumer mortgages 19 — 2,735 867 3,602 Credit cards — — — — — Other retail loans 27 — 663 566 1,229 Total retail 66 — 5,733 1,884 7,617 Total loans 272 $ 2,398 59,020 52,880 114,298 (1) (1) As a result of these loans being reported as TDRs, there were net charge-offs of approximately $163 thousand recorded during 2014 .
Summary of Loans to Executive Officers and Directors, Including Their Associates	The following is a summary of such loans and the activity in these loans for the year ended December 31, 2016 . (in thousands) Balance at December 31, 2015 $ 41,441 New loans 193,477 Repayments (179,345 ) Loans charged-off — Balance at December 31, 2016 $ 55,573

Other Comprehensive Income (L41

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)	The following table illustrates activity within the balances in accumulated other comprehensive income (loss) by component, and is shown for the years ended December 31, 2016 , 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 at December 31, 2013 $ (13,099 ) (28,936 ) 777 (41,258 ) Other comprehensive income before reclassifications — 29,041 243 29,284 Amounts reclassified from accumulated other comprehensive income (loss) 275 (818 ) (88 ) (631 ) Net current period other comprehensive income 275 28,223 155 28,653 Balance at December 31, 2014 $ (12,824 ) (713 ) 932 (12,605 ) Other comprehensive income (loss) before reclassifications — (15,806 ) 143 (15,663 ) Amounts reclassified from accumulated other comprehensive income (loss) 320 (1,703 ) (168 ) (1,551 ) Net current period other comprehensive income (loss) 320 (17,509 ) (25 ) (17,214 ) Balance at December 31, 2015 $ (12,504 ) (18,222 ) 907 (29,819 ) Other comprehensive income (loss) before reclassifications — (22,405 ) 63 (22,342 ) Amounts reclassified from accumulated other comprehensive income (loss) 287 (3,697 ) (88 ) (3,498 ) Net current period other comprehensive income (loss) 287 (26,102 ) (25 ) (25,840 ) Balance at December 31, 2016 $ (12,217 ) (44,324 ) 882 (55,659 )
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 years ended December 31, 2016 , 2015 , and 2014 . Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Details About Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified From Accumulated Other Comprehensive Income (Loss) Affected Line Item in the Statement Where Net Income is Presented For the Years Ended December 31, 2016 2015 2014 Net unrealized gains (losses) on cash flow hedges: Amortization of deferred losses $ (270 ) (448 ) (448 ) Interest expense Amortization of deferred losses (197 ) (73 ) — Loss on early extinguishment of debt, net 180 201 173 Income tax (expense) benefit $ (287 ) (320 ) (275 ) Reclassifications, net of income taxes Net unrealized gains (losses) on investment securities available for sale: Realized gains, net on sales of securities (1) $ 6,011 2,769 1,331 Investment securities gains, net (2,314 ) (1,066 ) (513 ) Income tax (expense) benefit $ 3,697 1,703 818 Reclassifications, net of income taxes Post-retirement unfunded health benefit: Amortization of actuarial gains $ 144 272 144 Salaries and other personnel expense (56 ) (104 ) (56 ) Income tax (expense) benefit $ 88 $ 168 $ 88 Reclassifications, net of income taxes (1) Includes $1.4 million in gains in 2016 from the transfer of $1.9 million of investment securities available for sale to trading account assets.

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment	Premises and equipment at December 31, 2016 and 2015 consists of the following: (in thousands) Useful Life (in years) 2016 2015 Land Indefinite $ 97,080 106,656 Buildings and improvements 10 - 40 377,754 403,437 Leasehold improvements 10 - 40 41,355 41,095 Furniture and equipment 3 - 10 370,458 406,121 Construction in progress 29,104 44,120 Total premises and equipment 915,751 1,001,429 Less: Accumulated depreciation and amortization (498,266 ) (556,274 ) Premises and equipment, net $ 417,485 445,155
Schedule of Future Minimum Rental Payments for Operating Leases	At December 31, 2016 , minimum rental commitments under all such non-cancelable leases for the next five years and thereafter are presented below. (in thousands) 2017 $ 27,527 2018 28,289 2019 25,484 2020 24,579 2021 22,247 Thereafter 154,219 Total $ 282,345

Goodwill And Other Intangible43

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table shows the changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 : (in thousands) Trust Services Reporting Unit Synovus Bank Reporting Unit Total Balance as of January 1, 2016 Goodwill $ 24,431 — 24,431 Accumulated impairment losses — — — 24,431 — 24,431 Goodwill acquired during year — 35,247 35,247 Impairment losses — — — Goodwill, net as of December 31, 2016 $ 24,431 35,247 59,678

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Other Assets [Abstract]
Schedule of Other Assets	Note 10 - Other Assets Significant balances included in other assets at December 31, 2016 and 2015 are presented below. (in thousands) 2016 2015 Cash surrender value of bank-owned life insurance $ 378,830 338,002 Federal Reserve Bank and FHLB stock 169,864 68,288 Accrued interest receivable 70,393 65,218 Prepaid expenses 35,542 33,348 Accounts receivable 29,821 19,692 Private equity investments 25,493 28,018 Derivative asset positions 20,623 27,139 Other properties held for sale 14,830 10,671 SBA/GGL servicing assets, net 4,451 4,287 Miscellaneous other assets 63,373 55,511 Total other assets $ 813,220 650,174

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Interest-bearing Deposit Liabilities [Abstract]
Schedule of Interest Bearing Deposits	A summary of interest bearing deposits at December 31, 2016 and 2015 is presented below. ( in thousands) 2016 2015 Interest bearing demand deposits $ 4,768,313 4,377,407 Money market accounts, excluding brokered deposits 7,251,093 7,042,350 Savings accounts 929,402 714,410 Time deposits, excluding brokered deposits 3,234,465 3,300,004 Brokered deposits 1,378,983 1,075,520 Total interest bearing deposits $ 17,562,256 16,509,691
Schedule of Cash Maturities of Time Deposits	The following table presents contractual maturities of all time deposits at December 31, 2016 . (in thousands) Maturing within one year $ 2,424,336 Between 1 — 2 years 922,828 2 — 3 years 278,722 3 — 4 years 204,813 4 — 5 years 99,288 Thereafter 22,481 $ 3,952,468

Long-term Debt and Short-term46

Long-term Debt and Short-term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term debt at December 31, 2016 and 2015 is presented in the following table. (in thousands) 2016 2015 Parent Company: 5.125% subordinated notes, due June 15, 2017, $278.6 million and $403.3 million par value at December 31, 2016 and 2015, respectively, with semi-annual interest payments and principal to be paid at maturity $ 278,480 402,812 7.875% senior notes, due February 15, 2019, $300 million par value with semi-annual interest payments and principal to be paid at maturity 297,763 296,711 5.75% fixed to adjustable rate subordinated notes, due December 15, 2025, $250 million par value with semi-annual interest payments at 5.75% for the first five years and quarterly payments thereafter at an adjustable rate equal to the then-current three month LIBOR rate + 418.2 basis points and principal to be paid at maturity 247,136 246,644 LIBOR + 1.80% debentures, due April 19, 2035, $10 million par value with quarterly interest payments and principal to be paid at maturity (rate of 2.76% at December 31, 2016 and 2.31% at December 31, 2015) 10,000 10,000 Hedge-related basis adjustment (1) 873 4,018 Total long-term debt — Parent Company 834,252 960,185 Synovus Bank: FHLB advances with interest and principal payments due at various maturity dates through 2022 and interest rates ranging from 0.63% to 0.66% at December 31, 2016 (weighted average interest rate of 0.64% and 0.46% at December 31, 2016 and 2015, respectively) 1,325,000 1,225,000 Capital lease with interest and principal payments due at various dates through 2031 (rate of 1.59% at both December 31, 2016 and 2015, respectively) 1,629 1,708 Total long-term debt — Synovus Bank 1,326,629 1,226,708 Total long-term debt $ 2,160,881 2,186,893 (1) Unamortized balance of terminated interest rate swaps reflected in debt for financial reporting purposes.
Schedule of Principal Payments on Long-term Debt	Contractual annual principal payments on long-term debt for the next five years and thereafter are shown on the following table. (in thousands) Parent Company Synovus Bank Total 2017 $ 278,591 88 278,679 2018 — 89 89 2019 300,000 275,090 575,090 2020 — 350,092 350,092 2021 — 450,097 450,097 Thereafter 260,000 251,173 511,173 Total $ 838,591 1,326,629 2,165,220
Components of Short-term Borrowings	The following table sets forth certain information regarding federal funds purchased and other securities sold under repurchase agreements. (dollars in thousands) 2016 2015 2014 Total balance at December 31, $ 159,699 177,025 126,916 Weighted average interest rate at December 31, 0.08 % 0.08 0.08 Maximum month end balance during the year $ 286,175 250,453 247,170 Average amount outstanding during the year 216,593 205,305 198,085 Weighted average interest rate during the year 0.09 % 0.08 0.11

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
Schedule of Change in Preferred and Common Shares Issued and Common Shares Held as Treasury Shares	The following table shows the changes in shares of preferred and common stock issued and common stock held as treasury shares for the three years ended December 31, 2016 . (shares in thousands) Series C Preferred Stock Issued Common Stock Issued Treasury Stock Held Common Stock Outstanding Balance at December 31, 2013 5,200 139,721 813 138,908 Restricted share unit activity — 52 — 52 Stock options exercised — 177 — 177 Repurchase of common stock — — 3,014 (3,014 ) Balance at December 31, 2014 5,200 139,950 3,827 136,123 Restricted share unit activity — 304 — 304 Stock options exercised — 338 — 338 Repurchase of common stock — — 7,218 (7,218 ) Balance at December 31, 2015 5,200 140,592 11,045 129,547 Issuance of common stock for acquisition — 821 — 821 Restricted share unit activity — 316 — 316 Stock options exercised — 297 — 297 Repurchase of common stock — — 8,715 (8,715 ) Balance at December 31, 2016 5,200 142,026 19,760 122,266

Regulatory Capital (Tables)

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Disclosure [Abstract]
Schedule of Compliance with Regulatory Capital	The following table summarizes regulatory capital information at December 31, 2016 and 2015 on a consolidated basis and for Synovus’ significant subsidiary, defined as any direct subsidiary with assets or net income levels exceeding 10% of the consolidated totals. Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions (1) (dollars in thousands) 2016 2015 2016 2015 2016 2015 Synovus Financial Corp. Tier 1 capital $ 2,685,880 2,660,016 1,599,725 1,538,637 N/A N/A Common equity tier 1 capital 2,654,287 2,660,016 1,199,794 1,153,977 N/A N/A Total risk-based capital 3,201,268 3,255,758 2,132,966 2,051,515 N/A N/A Tier 1 risk-based capital ratio 10.07 % 10.37 6.00 6.00 N/A N/A Common equity tier 1 capital ratio 9.96 10.37 4.50 4.50 N/A N/A Total risk-based capital ratio 12.01 12.70 8.00 8.00 N/A N/A Leverage ratio 8.99 9.43 4.00 4.00 N/A N/A Synovus Bank Tier 1 capital $ 3,187,583 3,136,132 1,597,302 1,535,541 2,129,736 2,047,388 Common equity tier 1 capital 3,187,583 3,136,132 1,197,976 1,151,656 1,730,410 1,663,503 Total risk-based capital 3,441,563 3,390,764 2,129,736 2,047,388 2,662,169 2,559,235 Tier 1 risk-based capital ratio 11.97 % 12.25 6.00 6.00 8.00 8.00 Common equity tier 1 capital ratio 11.97 12.25 4.50 4.50 6.50 6.50 Total risk-based capital ratio 12.93 13.25 8.00 8.00 10.00 10.00 Leverage ratio 10.68 11.15 4.00 4.00 5.00 5.00 (1) The prompt corrective action provisions are applicable at the bank level only.

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2016
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 net income per common share for the years ended December 31, 2016 , 2015 , and 2014 . Years Ended December 31, (in thousands, except per share data) 2016 2015 2014 Net income $ 246,784 226,082 195,249 Dividends on preferred stock 10,238 10,238 10,238 Net income available to common shareholders $ 236,546 215,844 185,011 Weighted average common shares outstanding 124,389 132,423 138,495 Potentially dilutive shares from outstanding equity-based awards 689 778 659 Weighted average diluted common shares 125,078 133,201 139,154 Net income per common share, basic $ 1.90 1.63 1.34 Net income per common share, diluted $ 1.89 1.62 1.33

Fair Value Accounting (Tables)

Fair Value Accounting (Tables)	12 Months Ended
	Dec. 31, 2016
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 December 31, 2016 and 2015 , 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 between levels for the years ended December 31, 2016 and 2015 were inconsequential. December 31, 2016 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: Mortgage-backed securities issued by U.S. Government agencies $ — 3,460 — 3,460 Collateralized mortgage obligations issued by U.S. Government sponsored enterprises — 3,438 — 3,438 State and municipal securities — 426 — 426 Other investments 1,890 100 1,990 Total trading securities 1,890 7,424 — 9,314 Mortgage loans held for sale — 51,545 — 51,545 Investment securities available for sale: U.S. Treasury securities 107,802 — — 107,802 U.S. Government agency securities — 12,993 — 12,993 Mortgage-backed securities issued by U.S. Government agencies — 174,202 — 174,202 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 2,506,340 — 2,506,340 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 890,442 — 890,442 State and municipal securities — 2,794 — 2,794 Equity securities 3,782 — — 3,782 Other investments (1) 3,092 14,952 1,796 19,840 Total investment securities available for sale 114,676 3,601,723 1,796 3,718,195 Private equity investments — — 25,493 25,493 Mutual funds held in rabbi trusts 11,479 — — 11,479 Derivative assets: Interest rate contracts — 17,157 — 17,157 Mortgage derivatives (2) — 3,466 — 3,466 Total derivative assets — 20,623 — 20,623 Liabilities Other liabilities (3) — — 14,000 14,000 Derivative liabilities: Interest rate contracts — 17,531 — 17,531 Visa derivative — — 5,768 5,768 Total derivative liabilities $ — 17,531 5,768 23,299 December 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 $ — 2,922 — 2,922 Collateralized mortgage obligations issued by U.S. Government sponsored enterprises — 1,078 — 1,078 State and municipal securities — 1,097 — 1,097 All other mortgage-backed securities — — — — Total trading securities — 5,097 — 5,097 Mortgage loans held for sale — 59,275 — 59,275 Investment securities available for sale: U.S. Treasury securities 43,357 — — 43,357 U.S. Government agency securities — 13,623 — 13,623 Securities issued by U.S. Government sponsored enterprises — 126,909 — 126,909 Mortgage-backed securities issued by U.S. Government agencies — 210,004 — 210,004 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 2,630,419 — 2,630,419 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 529,597 — 529,597 State and municipal securities — 4,434 — 4,434 Equity securities 9,672 — — 9,672 Other investments (1) 3,073 14,985 1,745 19,803 Total investment securities available for sale 56,102 3,529,971 1,745 3,587,818 Private equity investments — 870 27,148 28,018 Mutual funds held in rabbi trusts 10,664 — — 10,664 Derivative assets: Interest rate contracts — 25,580 — 25,580 Mortgage derivatives (2) — 1,559 — 1,559 Total derivative assets — 27,139 — 27,139 Liabilities Trading account liabilities — 1,032 — 1,032 Derivative liabilities: Interest rate contracts — 26,030 — 26,030 Visa derivative — — 1,415 1,415 Total derivative liabilities $ — 26,030 1,415 27,445 (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. (3 ) Other liabilities include contingent consideration obligation related to Global One acquisition.
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. Twelve Months Ended December 31, (in thousands) 2016 2015 2014 Changes in fair value included in net income: Mortgage loans held for sale $ (667 ) (742 ) 1,399 Mortgage loans held for sale: Fair value 51,545 59,275 63,328 Unpaid principal balance 51,114 58,177 61,488 Fair value less aggregate unpaid principal balance $ 431 1,098 1,840
Changes in Level 3 Fair Value Measurements	The table below includes a roll-forward of the amounts on the consolidated balance sheet for the year ended December 31, 2016 and 2015 (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 2016 and 2015, Synovus did not have any transfers between levels in the fair value hierarchy. 2016 (in thousands) Investment Securities Available for Sale Private Equity Investments Other Liabilities Visa Derivative Beginning balance, January 1, $ 1,745 27,148 — (1,415 ) Total gains (losses) realized/unrealized: Included in earnings — (1,026 ) — (5,795 ) Unrealized gains included in other comprehensive income 51 — — — Additions — — (14,000 ) — Sales — — — — Issuances — — — — Settlements — (629 ) — 1,442 Amortization of discount/premium — — — — Transfers in and/or out of Level 3 — — — — Ending balance, December 31, $ 1,796 25,493 (14,000 ) (5,768 ) Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31, $ — (1,026 ) — (5,795 ) 2015 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Beginning balance, January 1, $ 1,645 27,367 (1,401 ) Total gains (losses) realized/unrealized: Included in earnings — (219 ) (1,464 ) Unrealized gains included in other comprehensive income 100 — — Additions — — — Sales — — — Issuances — — — Settlements — — 1,450 Amortization of discount/premium — — — Transfers in and/or out of Level 3 — — — Ending balance, December 31, $ 1,745 27,148 (1,415 ) Total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31, $ — (219 ) (1,464 )
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis	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. As of December 31, 2016 Fair Value Adjustments for the Year Ended December 31, 2016 (in thousands) Level 1 Level 2 Level 3 Impaired loans* $ — — $ 21,742 6,613 Other real estate — — 19,305 1,223 Other assets held for sale — — 12,083 5,715 As of December 31, 2015 Fair Value Adjustments for the Year Ended December 31, 2015 Level 1 Level 2 Level 3 Impaired loans* $ — — $ 15,708 4,144 Other loans held for sale — — 471 31 Other real estate — — 48,166 4,927 Other assets held for sale — — 4,747 1,323 * Impaired loans that are collateral-dependent.
Fair Value Inputs, Assets, Quantitative Information	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. December 31, 2016 December 31, 2015 (dollars in thousands) Valuation Technique Significant Unobservable Input Level 3 Fair Value Range (Weighted Average) (1) Level 3 Fair Value Range (Weighted Average) (1) Assets measured at fair value on a recurring basis Investment Securities Available for Sale - Other investments: Trust preferred securities Discounted cash flow analysis Credit spread embedded in discount rate $ 1,796 442 bps 1,745 477 bps Private equity investments 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) 25,493 N/A 27,148 N/A Discount for lack of liquidity (2) 15% 15% Other liabilities Internal valuation Percentage of net income attributable to Global One Earnings as defined in merger agreement for three to five years 14,000 3 - 5 years — N/A Visa derivative liability Internal valuation Estimated timing of resolution of covered litigation, future cumulative deposits to the litigation escrow for settlement of the Covered Litigation, and estimated future monthly fees payable to the derivative counterparty 5,768 1 - 5 years 1,415 N/A December 31, 2016 December 31, 2015 (dollars in thousands) Valuation Technique Significant Unobservable Input Range (Weighted Average) (1) Range (Weighted Average) (1) Assets measured at fair value on a non-recurring basis Collateral-dependent impaired loans Third-party appraised value of collateral less estimated selling costs Discount to appraised value (3) Estimated selling costs 0%-52% (25%) 0%-10% (7%) 0%-80% (29%) 0%-10% (7%) Other loans held for sale Third-party appraised value of collateral less estimated selling costs Discount to appraised value (3) Estimated selling costs N/A 0%-3% (3%) 0%-10% (7%) Other real estate Third-party appraised value less estimated selling costs Discount to appraised value (3) Estimated selling costs 0%-10% (5%) 0%-10% (7%) 0%-20% (7%) 0%-10% (7%) Other assets held for sale Third-party appraised value less estimated selling costs or BOV Discount to appraised value (3) Estimated selling costs 0%-81% (47%) 0%-10% (7%) 0%-35% (31%) 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 December 31, 2016 and 2015 are as follows: December 31, 2016 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial Assets Cash and cash equivalents $ 395,175 395,175 395,175 — — Interest bearing funds with Federal Reserve Bank 527,090 527,090 527,090 — — Interest earning deposits with banks 18,720 18,720 18,720 — — Federal funds sold and securities purchased under resale agreements 58,060 58,060 58,060 — — Trading account assets 9,314 9,314 1,890 7,424 — Mortgage loans held for sale 51,545 51,545 — 51,545 — Investment securities available for sale 3,718,195 3,718,195 114,676 3,601,723 1,796 Private equity investments 25,493 25,493 — — 25,493 Mutual funds held in rabbi trusts 11,479 11,479 11,479 — — Loans, net of deferred fees and costs 23,856,391 23,709,434 — — 23,709,434 Derivative assets 20,623 20,623 — 20,623 — Financial Liabilities Non-interest bearing deposits 7,085,804 7,085,804 — 7,085,804 — Interest bearing deposits 17,562,256 17,560,021 — 17,560,021 — Federal funds purchased, other short-term borrowings and other short-term liabilities 159,699 159,699 159,699 — — Long-term debt 2,160,881 2,217,544 — 2,217,544 — Other liabilities 14,000 14,000 — — 14,000 Derivative liabilities $ 23,299 23,299 — 17,531 5,768 December 31, 2015 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 367,092 367,092 367,092 — — Interest bearing funds with Federal Reserve Bank 829,887 829,887 829,887 — — Interest earning deposits with banks 17,387 17,387 17,387 — — Federal funds sold and securities purchased under resale agreements 69,819 69,819 69,819 — — Trading account assets 5,097 5,097 — 5,097 — Mortgage loans held for sale 59,275 59,275 — 59,275 — Other loans held for sale 425 425 — — 425 Investment securities available for sale 3,587,818 3,587,818 56,102 3,529,971 1,745 Private equity investments 28,018 28,018 — 870 27,148 Mutual funds held in Rabbi Trusts 10,664 10,664 10,664 — — Loans, net of deferred fees and costs 22,429,565 22,192,903 — — 22,192,903 Derivative assets 27,139 27,139 — 27,139 — Financial liabilities Trading account liabilities $ 1,032 1,032 — 1,032 — Non-interest bearing deposits 6,732,970 6,732,970 — 6,732,970 — Interest bearing deposits 16,509,691 16,516,222 — 16,516,222 — Federal funds purchased, other short-term borrowings, and other short-term liabilities 177,025 177,025 177,025 — — Long-term debt 2,186,893 2,244,376 — 2,244,376 — Derivative liabilities 27,445 27,445 — 26,030 1,415

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Summary of Derivative Instruments [Abstract]
Impact of Derivatives on Balance Sheet	The impact of derivative instruments on the consolidated balance sheets at December 31, 2016 and 2015 is presented below. Fair Value of Derivative Assets Fair Value of Derivative Liabilities December 31, December 31, (in thousands) Location on Consolidated Balance Sheet 2016 2015 Location on Consolidated Balance Sheet 2016 2015 Derivatives not designated as hedging instruments: Interest rate contracts Other assets $ 17,157 25,580 Other liabilities 17,531 26,030 Mortgage derivatives Other assets 3,466 1,559 Other liabilities — — Visa derivative — — Other liabilities 5,768 1,415 Total derivatives not designated as hedging instruments $ 20,623 27,139 23,299 27,445
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 years ended December 31, 2016 , 2015 and 2014 is presented below. Derivative Location of Gain (Loss) Recognized in Income Gain (Loss) Recognized in Income Twelve Months Ended December 31, (in thousands) 2016 2015 2014 Derivatives not designated as hedging instruments Interest rate contracts (1) Other Non- Interest Income $ 76 44 460 Mortgage derivatives (2) Mortgage Banking Income $ 1,907 1,099 (1,062 ) Total $ 1,983 1,143 (602 ) (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.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Loan Commitments and Letters of Credit	Unfunded lending commitments and letters of credit at December 31, 2016 are presented below. (in thousands) Letters of credit* $ 150,948 Commitments to fund commercial real estate, construction, and land development loans 1,394,162 Unused credit card lines 1,103,431 Commitments under home equity lines of credit 1,096,052 Commitments to fund commercial and industrial loans 4,792,834 Other loan commitments 307,772 Total unfunded lending commitments and letters of credit $ 8,845,199 * Represent the contractual amount net of risk participations of $83 million .

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation [Abstract]
Schedule of Stock Options Activity	A summary of stock option activity and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below. Stock Options 2016 2015 2014 Shares Weighted-Average Exercise Price Shares Weighted-Average Exercise Price Shares Weighted-Average Exercise Price Outstanding at beginning of year 1,741,975 $ 37.88 2,550,046 $ 45.11 3,220,110 $ 49.00 Option rounding due to reverse stock split on May 16, 2014 — — — — 841 49.00 Options exercised (297,225 ) 17.35 (338,808 ) 16.72 (178,176 ) 17.14 Options forfeited (1,597 ) 17.64 (12,825 ) 17.17 (30,146 ) 15.79 Options expired/canceled (469,792 ) 92.62 (456,438 ) 94.56 (462,583 ) 84.88 Options outstanding at end of year 973,361 $ 17.76 1,741,975 $ 37.88 2,550,046 $ 45.11 Options exercisable at end of year 973,361 $ 17.76 1,504,783 $ 41.08 1,870,516 $ 55.40
Fair Value of Option Grants Used in Measuring Compensation Expense	The fair value of market restricted share units granted was estimated on the date of grant using a Monte Carlo simulation model with the following weighted average assumptions: 2016 2015 2014 Risk-free interest rate 0.81 % 1.05 % 0.70 % Expected stock price volatility 25.7 26.4 39.2 Dividend yield 1.8 1.4 1.2 Simulation period 3.0 years 3.0 years 3.0 years
Schedule of Restricted Stock Units Activity	A summary of performance share units outstanding and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below. Performance Share Units Share Units Weighted-Average grant date Fair Value Outstanding at December 31, 2013 — $ — Granted 67,157 23.47 Dividend equivalents granted 518 24.09 Outstanding at December 31, 2014 67,675 23.47 Granted 82,152 28.06 Dividend equivalents granted 1,740 28.06 Outstanding at December 31, 2015 151,567 26.01 Granted 83,529 25.95 Dividend equivalents granted 3,384 25.95 Outstanding at December 31, 2016 238,480 $ 25.99 A summary of restricted share units outstanding and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below (excluding market restricted and performance share units). Restricted Share Units Share Units Weighted-Average grant date Fair Value Outstanding at December 31, 2013 581,677 $ 16.38 Share unit rounding due to reverse stock split on May 16, 2014 258 16.38 Granted 407,374 23.69 Dividend equivalents granted 8,805 24.09 Vested (64,725 ) 15.45 Forfeited (50,566 ) 17.92 Outstanding at December 31, 2014 882,823 19.81 Granted 321,874 28.09 Dividend equivalents granted 9,810 28.09 Vested (428,121 ) 17.48 Forfeited (23,619 ) 24.60 Outstanding at December 31, 2015 762,767 24.57 Granted 350,458 26.43 Dividend equivalents granted 11,105 26.43 Vested (406,496 ) 23.10 Forfeited (12,067 ) 23.96 Outstanding at December 31, 2016 705,767 $ 26.38 A summary of market restricted share units outstanding and changes during the years ended December 31, 2016 , 2015 , and 2014 is presented below. Market Restricted Share Units Share Units Weighted-Average grant date Fair Value Outstanding at December 31, 2013 40,512 $ 24.43 Share unit rounding due to reverse stock split on May 16, 2014 4 24.43 Granted 90,117 24.30 Dividend equivalents granted 1,231 24.09 Quantity change by TSR factor 1,518 24.43 Vested (15,196 ) 24.43 Outstanding at December 31, 2014 118,186 24.33 Granted 82,152 29.39 Dividend equivalents granted 2,221 29.05 Quantity change by TSR factor 4,838 24.33 Vested (49,149 ) 24.34 Outstanding at December 31, 2015 158,248 27.02 Granted 93,913 26.93 Dividend equivalents granted 3,095 26.93 Quantity change by TSR factor 9,970 26.93 Vested (82,817 ) 26.40 Outstanding at December 31, 2016 182,409 $ 27.25
Schedule of Grants Under All Synovus Equity Compensation Plans	The following table provides aggregate information regarding grants under all Synovus equity compensation plans through December 31, 2016 . Plan Category (a) Number of Securities to be Issued Upon Vesting of Restricted Share Units, Market Restricted Share Units, and Performance Share Units (1) (b) Number of Securities to be Issued Upon Exercise of Outstanding Options (c) Weighted-Average Exercise Price of Outstanding Options in Column (b) (d) Number of Shares Remaining Available for Issuance Excluding Shares Reflected in Columns (a) and (b) Shareholder approved equity compensation plans for shares of Synovus stock 1,126,656 973,361 $ 17.76 6,432,798 (1) Market restricted and performance share units included at defined target levels. Actual shares issued upon vesting may differ based on actual TSR and ROAA over the measurement period.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of income tax expense included in the consolidated statements of income for the years ended December 31, 2016 , 2015 , and 2014 as presented: (in thousands) 2016 2015 2014 Current Federal $ 7,329 6,163 5,140 State 5,501 4,424 150 Total current income tax expense 12,830 10,587 5,290 Deferred Federal 117,463 108,877 92,360 State 11,374 13,027 9,660 Total deferred income tax expense 128,837 121,904 102,020 Total income tax expense $ 141,667 132,491 107,310 Note: The table above does not reflect amounts relating to share-based compensation transactions that were charged or credited directly to shareholders' equity. The amounts charged or credited to shareholder's equity for the years ended December 31, 2016 , 2015 , and 2014 were a decrease of $790 thousand , an increase of $1.7 million , and a decrease of $3.2 million , respectively.
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the differences for the years ended December 31, 2016 , 2015 and 2014 as presented: Years Ended December 31, (in thousands) 2016 2015 2014 Income tax expense at statutory federal income tax rate $ 135,957 125,501 105,896 Increase (decrease) resulting from: State income tax expense, net of federal income tax benefit 13,256 12,870 8,014 Bank-owned life insurance (3,402 ) (2,885 ) (2,928 ) Change in valuation allowance (2,055 ) (589 ) (2,273 ) General business tax credits (1,213 ) (1,173 ) (1,123 ) Tax-exempt income (825 ) (835 ) (1,076 ) Other, net (51 ) (398 ) 800 Total income tax expense $ 141,667 132,491 107,310 Effective tax rate 36.5 % 36.9 % 35.5 %
Schedule of Deferred Tax Assets and Liabilities	Significant portions of the deferred tax assets and liabilities at December 31, 2016 and 2015 are presented: (in thousands) 2016 2015 Deferred tax assets Net operating loss carryforwards $ 167,072 308,617 Allowance for loan losses 100,419 103,884 Tax credit carryforwards 67,031 59,434 Employee benefits and deferred compensation 21,024 21,177 Net unrealized losses on investment securities available for sale 19,413 3,072 Non-performing loan interest 19,137 16,604 Deferred revenue 18,639 16,529 Other 19,759 18,573 Total gross deferred tax assets 432,494 547,890 Less valuation allowance (9,658 ) (11,713 ) Total deferred tax assets 422,836 536,177 Deferred tax liabilities Fixed assets held for sale (8,179 ) (5,985 ) Purchase accounting adjustments (5,765 ) (811 ) Excess tax over financial statement depreciation (5,343 ) (8,564 ) Ownership interest in partnerships (5,242 ) (4,537 ) Other (2,951 ) (4,332 ) Total gross deferred tax liabilities (27,480 ) (24,229 ) Net deferred tax asset $ 395,356 511,948 Note: The table above includes $3.1 million in net deferred tax liabilities from the acquisition of Global One on October 1, 2016. Please refer to Note 2 - "Acquisition" of this Report for more information on the acquisition of Global One.
Schedule of Net Operating Loss and Tax Credit Carryforward	Federal and state NOL and tax credit carryforwards as of December 31, 2016 are summarized in the following table. Tax Carryforwards As of December 31, 2016 (in thousands) Expiration Dates Deferred Tax Asset Balance Valuation Allowance Net Deferred Tax Asset Balance Pre-Tax Earnings Necessary to Realize Net operating losses - federal (3) 2031-2036 $ 126,351 — 126,351 361,004 General business credits - federal 2028-2036 8,383 — 8,383 NA (1) Net operating losses - states 2025-2029 13,244 — 13,244 1,370,624 Net operating losses - states (3) 2030-2036 36,148 — 36,148 1,165,627 Other credits - states 2017-2020 12,422 (9,658 ) 2,764 NA (1) Other credits - states 2021-2026 2,239 — 2,239 NA (1) Alternative minimum tax credits - federal None 43,037 — 43,037 NA (2) Other credits - states None 950 — 950 NA (1) (1) N/A indicates credits are not measured on a pre-tax earnings basis. (2) Alternative minimum tax credits can be carried forward indefinitely. (3) $3.0 million of acquired NOLs from Global One acquisition have a utilization limitation.
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized income tax benefits is as follows (unrecognized state income tax benefits are not adjusted for the federal income tax impact). Years Ended December 31, (in thousands) 2016 2015 2014 Balance at January 1, $ 12,745 13,023 912 Additions based on income tax positions related to current year — — — Additions for income tax positions of prior years * 1,811 8 12,318 Additions from acquisition 608 — — Deductions for income tax positions of prior years — — (52 ) Statute of limitation expirations (419 ) (286 ) (155 ) Settlements — — — Balance at December 31, $ 14,745 12,745 13,023 *Includes deferred tax benefits that could reduce future tax liabilities.

Condensed Financial Informati55

Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheets	Condensed Balance Sheets December 31, (in thousands) 2016 2015 Assets Cash due from bank subsidiary $ 234,339 369,564 Funds due from other depository institutions (1) 19,911 19,911 Investment in consolidated bank subsidiary, at equity 3,319,980 3,339,233 Investment in consolidated nonbank subsidiaries, at equity 71,335 71,350 Notes receivable from nonbank subsidiaries 35,200 67,000 Other assets 101,346 105,513 Total assets $ 3,782,111 3,972,571 Liabilities and Shareholders' Equity Liabilities: Long-term debt $ 834,252 960,185 Other liabilities 19,935 12,190 Total liabilities 854,187 972,375 Shareholders’ equity: Series C Preferred Stock 125,980 125,980 Common stock 142,026 140,592 Additional paid-in capital 3,028,405 2,989,981 Treasury stock (664,595 ) (401,511 ) Accumulated other comprehensive loss, net (55,659 ) (29,819 ) Retained earnings 351,767 174,973 Total shareholders’ equity 2,927,924 3,000,196 Total liabilities and shareholders’ equity $ 3,782,111 3,972,571 (1) Restricted as to withdrawal. Condensed Statements of Income Years Ended December 31, (in thousands) 2016 2015 2014 Income Cash dividends received from Synovus Bank $ 325,000 199,904 90,626 Cash distributions received from Synovus Bank — 25,096 91,374 Interest income 2,565 8,865 14,262 Other income 4,595 (337 ) (932 ) Total income 332,160 233,528 195,330 Expenses Interest expense 52,831 46,585 45,726 Other expenses 20,652 10,516 10,337 Total expenses 73,483 57,101 56,063 Income before income taxes and equity in undistributed income (loss) of subsidiaries 258,677 176,427 139,267 Allocated income tax benefit (25,628 ) (18,808 ) (16,491 ) Income before equity in undistributed income (loss) of subsidiaries 284,305 195,235 155,758 Equity in undistributed income (loss) of subsidiaries (37,521 ) 30,847 39,491 Net income 246,784 226,082 195,249 Dividends on preferred stock 10,238 10,238 10,238 Net income available to common shareholders $ 236,546 215,844 185,011
Schedule of Condensed Statements of Operations	Condensed Statements of Income Years Ended December 31, (in thousands) 2016 2015 2014 Income Cash dividends received from Synovus Bank $ 325,000 199,904 90,626 Cash distributions received from Synovus Bank — 25,096 91,374 Interest income 2,565 8,865 14,262 Other income 4,595 (337 ) (932 ) Total income 332,160 233,528 195,330 Expenses Interest expense 52,831 46,585 45,726 Other expenses 20,652 10,516 10,337 Total expenses 73,483 57,101 56,063 Income before income taxes and equity in undistributed income (loss) of subsidiaries 258,677 176,427 139,267 Allocated income tax benefit (25,628 ) (18,808 ) (16,491 ) Income before equity in undistributed income (loss) of subsidiaries 284,305 195,235 155,758 Equity in undistributed income (loss) of subsidiaries (37,521 ) 30,847 39,491 Net income 246,784 226,082 195,249 Dividends on preferred stock 10,238 10,238 10,238 Net income available to common shareholders $ 236,546 215,844 185,011
Schedule of Condensed Statements of Comprehensive Income (Loss)	Condensed Statements of Comprehensive Income December 31, 2016 December 31, 2015 December 31, 2014 (in thousands) Before-tax Amount Tax (Expense) Benefit Net of Tax Amount Before-tax Amount Tax (Expense) Benefit Net of Tax Amount Before-tax Amount Tax (Expense) Benefit Net of Tax Amount Net income $ 388,451 (141,667 ) 246,784 358,573 (132,491 ) 226,082 302,559 (107,310 ) 195,249 Reclassification adjustment for losses realized in net income on cash flow hedges 467 (180 ) 287 521 (201 ) 320 448 (173 ) 275 Reclassification adjustment for net gains realized in net income on investment securities available for sale (5,763 ) 2,219 (3,544 ) — — — — — — Net unrealized gains on investment securities available for sale 2,358 (908 ) 1,450 2,908 (1,120 ) 1,788 21 (8 ) 13 Other comprehensive (loss) gain of bank subsidiary (39,080 ) 15,047 (24,033 ) (31,420 ) 12,098 (19,322 ) 46,122 (17,757 ) 28,365 Other comprehensive (loss) income $ (42,018 ) 16,178 (25,840 ) (27,991 ) 10,777 (17,214 ) 46,591 (17,938 ) 28,653 Comprehensive income $ 220,944 208,868 223,902 Condensed Statements of Cash Flows Years Ended December 31, (in thousands) 2016 2015 2014 Operating Activities Net income $ 246,784 226,082 195,249 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed loss (income) of subsidiaries 37,521 (30,847 ) (39,491 ) Deferred income tax expense (benefit) 17,989 (2,506 ) (5,041 ) Net increase (decrease) in other liabilities 7,746 (1,709 ) (22,323 ) Net (increase) decrease in other assets (9,214 ) 1,045 14,226 Other, net (1,648 ) (178 ) (2,041 ) Net cash provided by operating activities 299,178 191,887 140,579 Investing Activities Outlays for business combinations (3,408 ) — — Net decrease in short-term notes receivable from non-bank subsidiaries 31,800 10,000 39,000 Net cash provided by investing activities 28,392 10,000 39,000 Financing Activities Dividends paid to common and preferred shareholders (69,663 ) (65,592 ) (53,043 ) Repurchases and agreements to repurchase shares of common stock (263,084 ) (199,221 ) (88,113 ) Repayments on long-term debt (130,048 ) (48,553 ) — Proceeds from issuance of long-term debt — 246,644 — Net cash used in financing activities (462,795 ) (66,722 ) (141,156 ) (Decrease) increase in cash and funds due from banks (135,225 ) 135,165 38,423 Cash and funds due from banks at beginning of year 389,475 254,310 215,887 Cash and funds due from banks at end of year $ 254,250 389,475 254,310
Schedule of Condensed Statements of Cash Flows	Condensed Statements of Cash Flows Years Ended December 31, (in thousands) 2016 2015 2014 Operating Activities Net income $ 246,784 226,082 195,249 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed loss (income) of subsidiaries 37,521 (30,847 ) (39,491 ) Deferred income tax expense (benefit) 17,989 (2,506 ) (5,041 ) Net increase (decrease) in other liabilities 7,746 (1,709 ) (22,323 ) Net (increase) decrease in other assets (9,214 ) 1,045 14,226 Other, net (1,648 ) (178 ) (2,041 ) Net cash provided by operating activities 299,178 191,887 140,579 Investing Activities Outlays for business combinations (3,408 ) — — Net decrease in short-term notes receivable from non-bank subsidiaries 31,800 10,000 39,000 Net cash provided by investing activities 28,392 10,000 39,000 Financing Activities Dividends paid to common and preferred shareholders (69,663 ) (65,592 ) (53,043 ) Repurchases and agreements to repurchase shares of common stock (263,084 ) (199,221 ) (88,113 ) Repayments on long-term debt (130,048 ) (48,553 ) — Proceeds from issuance of long-term debt — 246,644 — Net cash used in financing activities (462,795 ) (66,722 ) (141,156 ) (Decrease) increase in cash and funds due from banks (135,225 ) 135,165 38,423 Cash and funds due from banks at beginning of year 389,475 254,310 215,887 Cash and funds due from banks at end of year $ 254,250 389,475 254,310

Supplemental Financial Data (Ta

Supplemental Financial Data (Tables)	12 Months Ended
	Dec. 31, 2016
Supplemental Income Statement Elements [Abstract]
Schedule of Income Statement, Supplemental Disclosure	Components of other non-interest income and other operating expenses in excess of 1% of total interest income and total non-interest income for any of the respective years are as follows: Years Ended December 31, (in thousands) 2016 2015 2014 Litigation settlement/contingency expenses $ 2,511 5,110 12,812 Insurance and bonds 12,023 12,514 11,801

Summary of Quarterly Financia57

Summary of Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Data [Abstract]
Schedule of Quarterly Financial Information	Presented below is a summary of the unaudited consolidated quarterly financial data for the years ended December 31, 2016 and 2015 . 2016 (in thousands, except per share data) Fourth Quarter Third Quarter Second Quarter First Quarter Interest income $ 264,534 256,554 252,393 249,323 Net interest income 233,530 226,007 221,449 218,193 Provision for loan losses 6,259 5,671 6,693 9,377 Income before income taxes 108,068 102,620 94,031 83,730 Income tax expense 39,519 37,375 33,574 31,199 Net income 68,549 65,245 60,457 52,531 Net income available to common shareholders $ 65,990 62,686 57,898 49,972 Net income per common share, basic $ 0.54 0.51 0.46 0.39 Net income per common share, diluted 0.54 0.51 0.46 0.39 2015 Fourth Quarter (1) Third Quarter Second Quarter First Quarter Interest income $ 242,814 238,093 233,654 231,401 Net interest income 212,620 207,790 203,644 203,263 Provision for loan losses 5,021 2,956 6,636 4,397 Income before income taxes 90,741 93,986 88,034 85,812 Income tax expense 32,342 36,058 32,242 31,849 Net income 58,398 57,928 55,792 53,963 Net income available to common shareholders $ 55,839 55,369 53,233 51,404 Net income per common share, basic $ 0.43 0.42 0.40 0.38 Net income per common share, diluted 0.43 0.42 0.40 0.38 (1) The results for the three months ended December 31, 2015 include an out-of-period adjustment that increased the provision for loan losses by $12.9 million , resulting from the correction of an error that arose in 2012 which management identified during the fourth quarter of 2015. The correction increased the provision for loan losses by $13.3 million for the full year 2015.

Summary of Significant Accoun58

Summary of Significant Accounting Policies (Details) $ in Thousands	Apr. 24, 2014	Dec. 31, 2016USD ($)shares	Nov. 17, 2016USD ($)	Dec. 31, 2015USD ($)shares	Dec. 31, 2014shares	Dec. 31, 2013shares
Basis Of Presentation [Line Items]
Cash and cash equivalents		$ 130,000		$ 117,300
Interest earning deposits with banks		5,600		2,200
Federal funds sold		56,100		65,900
Loans, net of deferred fees and costs		23,604,633		22,177,069
Federal Reserve Bank stock held		98,600	$ 97,300	1,200
Federal Home Loan Bank stock held		$ 71,300		$ 67,100
Stock split, conversion ratio	0.1429
Options outstanding (in shares) | shares		973,361		1,741,975	2,550,046	3,220,110
Non-interest income revenue streams in scope		50.00%
Non-employee Director [Member]
Basis Of Presentation [Line Items]
Vesting period		3 years
Non-employee [Member]
Basis Of Presentation [Line Items]
Vesting period		3 years
Low Income Housing Tax Credit Partnerships [Member]
Basis Of Presentation [Line Items]
Carrying value of VIE assets and liabilities, net		$ 26,500		$ 18,900
DRR Methodology [Member]
Basis Of Presentation [Line Items]
Loans, net of deferred fees and costs		$ 7,600,000
Loans, net, percent		31.80%
Maximum [Member]
Basis Of Presentation [Line Items]
Retail loans and commercial loans, evaluated for impairment		$ 1,000
Useful life		10 years
Minimum [Member]
Basis Of Presentation [Line Items]
Useful life		8 years
Cash And Cash Equivalents [Member]
Basis Of Presentation [Line Items]
Total deposits		$ 533		$ 100

Acquisition (Narrative) (Detail

Acquisition (Narrative) (Details) - USD ($)	Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Common stock, shares issued (in shares)		142,025,720	140,592,409
Common stock		$ 142,026,000	$ 140,592,000
Global One [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 30,000,000
Common stock, shares issued (in shares)	821,000
Common stock	$ 26,592,000
Cash paid	$ 3,408,000
Earnout liability		$ 14,000,000
Global One [Member] | Minimum [Member]
Business Acquisition [Line Items]
Potential additional payments based on earnings, period	3 years
Global One [Member] | Maximum [Member]
Business Acquisition [Line Items]
Potential additional payments based on earnings, period	5 years

Acquisition (Assets Acquired an

Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($)	Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets acquired:
Goodwill		$ 59,678,000	$ 24,431,000	$ 24,431,000
Liabilities assumed:
Fair value of common stock issued		142,026,000	140,592,000
Long-term debt		2,160,881,000	$ 2,186,893,000
Global One [Member]
Assets acquired:
Cash and due from banks	$ 9,554,000
Commercial and industrial loans	356,665,000
Goodwill	35,247,000
Other intangible assets	13,400,000	$ 13,400,000
Other assets	2,742,000
Total assets acquired	417,608,000
Liabilities assumed:
Notes payable	358,560,000
Contingent consideration	14,000,000
Deferred tax liability, net	3,145,000
Other liabilities	11,903,000
Total liabilities assumed	387,608,000
Consideration paid	30,000,000
Cash paid	3,408,000
Fair value of common stock issued	26,592,000
Loans, unpaid principal balance	356,700,000
Long-term debt	$ 357,000,000

Sale of Branches (Details)

Sale of Branches (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Jan. 17, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans, net of deferred fees and costs		$ 23,604,633	$ 22,177,069
Deposits		$ 24,648,060	$ 23,242,661
Trust One Bank, Memphis, Tennessee [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans, net of deferred fees and costs				$ 89,600
Deposits				$ 191,300
Gain on disposition of business	$ 5,800

Restructuring Charges (Narrativ

Restructuring Charges (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014branches	Dec. 31, 2016USD ($)branches	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 8,267	$ 36	$ 20,585
Number of branches closed | branches	13	9
Asset impairment charges		$ 8,107	229	7,530
Gain on sale of certain branch locations			401
Other operating expenses		91,283	91,370	$ 94,337
Continued Corporate Real Estate Optimization Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		5,300
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges		$ 2,800
Other operating expenses			$ 437

Restructuring Charges (Restruct

Restructuring Charges (Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Charges [Abstract]
Severance charges	$ 0	$ 0	$ 7,246
Lease termination charges	6	(3)	4,808
Asset impairment charges	8,107	229	7,530
Gain on sale of assets held for sale, net	0	(401)	(766)
Professional fees and other charges	154	211	1,767
Total restructuring charges	$ 8,267	$ 36	$ 20,585

Restructuring Charges (Restru64

Restructuring Charges (Restructuring Reserve) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Beginning balance	$ 6,617	$ 8,830	$ 2,955
Accruals for efficiency initiatives	6	(3)	12,054
Payments	(2,574)	(2,210)	(6,179)
Ending balance	4,049	6,617	8,830
Severance Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	1,930	3,291	1,572
Accruals for efficiency initiatives	0	0	7,246
Payments	(1,849)	(1,361)	(5,527)
Ending balance	81	1,930	3,291
Lease Termination Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	4,687	5,539	1,383
Accruals for efficiency initiatives	6	(3)	4,808
Payments	(725)	(849)	(652)
Ending balance	$ 3,968	$ 4,687	$ 5,539

Investment Securities Availab65

Investment Securities Available for Sale (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)	Dec. 31, 2016USD ($)securities	Dec. 31, 2015USD ($)
Investments [Abstract]
Pledged to secure deposits | $		$ 2,040,000	$ 2,430,000
Securities in a loss position for less than twelve months | securities		88
Securities in a loss position for more than twelve months | securities		4
Other-than-temporary impairment charges | $	$ 88

Investment Securities Availab66

Investment Securities Available for Sale (Summary Of Available For Sale Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 3,768,618	$ 3,595,798
Gross Unrealized Gains	11,114	19,303
Gross Unrealized Losses	(61,537)	(27,283)
Fair Value	3,718,195	3,587,818
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	108,221	43,125
Gross Unrealized Gains	225	232
Gross Unrealized Losses	(644)	0
Fair Value	107,802	43,357
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,727	13,087
Gross Unrealized Gains	266	536
Gross Unrealized Losses	0	0
Fair Value	12,993	13,623
Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		126,520
Gross Unrealized Gains		389
Gross Unrealized Losses		0
Fair Value		126,909
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	174,440	209,785
Gross Unrealized Gains	1,116	1,340
Gross Unrealized Losses	(1,354)	(1,121)
Fair Value	174,202	210,004
Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,543,495	2,645,107
Gross Unrealized Gains	5,416	7,874
Gross Unrealized Losses	(42,571)	(22,562)
Fair Value	2,506,340	2,630,419
Collateralized Mortgage Obligations Issued by U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	905,789	530,426
Gross Unrealized Gains	1,214	2,396
Gross Unrealized Losses	(16,561)	(3,225)
Fair Value	890,442	529,597
State and Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,780	4,343
Gross Unrealized Gains	14	92
Gross Unrealized Losses	0	(1)
Fair Value	2,794	4,434
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	919	3,228
Gross Unrealized Gains	2,863	6,444
Gross Unrealized Losses	0	0
Fair Value	3,782	9,672
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,247	20,177
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(407)	(374)
Fair Value	$ 19,840	$ 19,803

Investment Securities Availab67

Investment Securities Available for Sale (Schedule Of Unrealized Loss On Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 3,012,769	$ 1,990,616
Less than 12 Months, Unrealized Losses	60,156	14,491
12 Months or Longer, Fair Value	33,315	585,640
12 Months or Longer, Unrealized Losses	1,381	12,792
Total Fair Value	3,046,084	2,576,256
Total Unrealized Losses	61,537	27,283
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	64,023
Less than 12 Months, Unrealized Losses	644
12 Months or Longer, Fair Value	0
12 Months or Longer, Unrealized Losses	0
Total Fair Value	64,023
Total Unrealized Losses	644
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	128,121	122,626
Less than 12 Months, Unrealized Losses	1,240	639
12 Months or Longer, Fair Value	3,626	18,435
12 Months or Longer, Unrealized Losses	114	482
Total Fair Value	131,747	141,061
Total Unrealized Losses	1,354	1,121
Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	2,123,181	1,656,194
Less than 12 Months, Unrealized Losses	42,571	12,874
12 Months or Longer, Fair Value	0	489,971
12 Months or Longer, Unrealized Losses	0	9,688
Total Fair Value	2,123,181	2,146,165
Total Unrealized Losses	42,571	22,562
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	682,492	196,811
Less than 12 Months, Unrealized Losses	15,653	963
12 Months or Longer, Fair Value	24,801	72,366
12 Months or Longer, Unrealized Losses	908	2,262
Total Fair Value	707,293	269,177
Total Unrealized Losses	16,561	3,225
State and Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value		0
Less than 12 Months, Unrealized Losses		0
12 Months or Longer, Fair Value		50
12 Months or Longer, Unrealized Losses		1
Total Fair Value		50
Total Unrealized Losses		1
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	14,952	14,985
Less than 12 Months, Unrealized Losses	48	15
12 Months or Longer, Fair Value	4,888	4,818
12 Months or Longer, Unrealized Losses	359	359
Total Fair Value	19,840	19,803
Total Unrealized Losses	$ 407	$ 374

Investment Securities Availab68

Investment Securities Available for Sale (Amortized Cost And Estimated Fair Value By Contractual Maturity Of Investment Securities Available For Sale) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	$ 19,698
Amortized Cost, 1 to 5 Years	96,041
Amortized Cost, 5 to 10 Years	659,705
Amortized Cost, More Than 10 years	2,989,008
Amortized Cost, Amortized Cost, No Stated Maturity	4,166
Total Amortized Cost	3,768,618
Fair Value, Within One year	19,724
Fair Value, 1 to 5 Years	95,714
Fair Value, 5 to 10 Years	659,905
Fair Value, More Than 10 years	2,935,978
Fair Value, No Stated Maturity	6,874
Total Fair Value	3,718,195
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	18,435
Amortized Cost, 1 to 5 Years	89,786
Amortized Cost, 5 to 10 Years	0
Amortized Cost, More Than 10 years	0
Amortized Cost, Amortized Cost, No Stated Maturity	0
Total Amortized Cost	108,221
Fair Value, Within One year	18,435
Fair Value, 1 to 5 Years	89,367
Fair Value, 5 to 10 Years	0
Fair Value, More Than 10 years	0
Fair Value, No Stated Maturity	0
Total Fair Value	107,802
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	999
Amortized Cost, 1 to 5 Years	5,929
Amortized Cost, 5 to 10 Years	5,799
Amortized Cost, More Than 10 years	0
Amortized Cost, Amortized Cost, No Stated Maturity	0
Total Amortized Cost	12,727
Fair Value, Within One year	1,021
Fair Value, 1 to 5 Years	6,019
Fair Value, 5 to 10 Years	5,953
Fair Value, More Than 10 years	0
Fair Value, No Stated Maturity	0
Total Fair Value	12,993
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	0
Amortized Cost, 1 to 5 Years	0
Amortized Cost, 5 to 10 Years	14,345
Amortized Cost, More Than 10 years	160,095
Amortized Cost, Amortized Cost, No Stated Maturity	0
Total Amortized Cost	174,440
Fair Value, Within One year	0
Fair Value, 1 to 5 Years	0
Fair Value, 5 to 10 Years	14,784
Fair Value, More Than 10 years	159,418
Fair Value, No Stated Maturity	0
Total Fair Value	174,202
Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	154
Amortized Cost, 1 to 5 Years	86
Amortized Cost, 5 to 10 Years	624,561
Amortized Cost, More Than 10 years	1,918,694
Amortized Cost, Amortized Cost, No Stated Maturity	0
Total Amortized Cost	2,543,495
Fair Value, Within One year	158
Fair Value, 1 to 5 Years	88
Fair Value, 5 to 10 Years	624,216
Fair Value, More Than 10 years	1,881,878
Fair Value, No Stated Maturity	0
Total Fair Value	2,506,340
Collateralized Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	0
Amortized Cost, 1 to 5 Years	0
Amortized Cost, 5 to 10 Years	0
Amortized Cost, More Than 10 years	905,789
Amortized Cost, Amortized Cost, No Stated Maturity	0
Total Amortized Cost	905,789
Fair Value, Within One year	0
Fair Value, 1 to 5 Years	0
Fair Value, 5 to 10 Years	0
Fair Value, More Than 10 years	890,442
Fair Value, No Stated Maturity	0
Total Fair Value	890,442
State and Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	110
Amortized Cost, 1 to 5 Years	240
Amortized Cost, 5 to 10 Years	0
Amortized Cost, More Than 10 years	2,430
Amortized Cost, Amortized Cost, No Stated Maturity	0
Total Amortized Cost	2,780
Fair Value, Within One year	110
Fair Value, 1 to 5 Years	240
Fair Value, 5 to 10 Years	0
Fair Value, More Than 10 years	2,444
Fair Value, No Stated Maturity	0
Total Fair Value	2,794
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	0
Amortized Cost, 1 to 5 Years	0
Amortized Cost, 5 to 10 Years	0
Amortized Cost, More Than 10 years	0
Amortized Cost, Amortized Cost, No Stated Maturity	919
Total Amortized Cost	919
Fair Value, Within One year	0
Fair Value, 1 to 5 Years	0
Fair Value, 5 to 10 Years	0
Fair Value, More Than 10 years	0
Fair Value, No Stated Maturity	3,782
Total Fair Value	3,782
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Within One year	0
Amortized Cost, 1 to 5 Years	0
Amortized Cost, 5 to 10 Years	15,000
Amortized Cost, More Than 10 years	2,000
Amortized Cost, Amortized Cost, No Stated Maturity	3,247
Total Amortized Cost	20,247
Fair Value, Within One year	0
Fair Value, 1 to 5 Years	0
Fair Value, 5 to 10 Years	14,952
Fair Value, More Than 10 years	1,796
Fair Value, No Stated Maturity	3,092
Total Fair Value	$ 19,840

Investment Securities Availab69

Investment Securities Available for Sale (Summary Of Sales Transactions In The Investment Securities Available For Sale Portfolio) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Proceeds from sales of investment securities available for sale	$ 968,606	$ 347,954	$ 20,815
Gross realized gains on sales (1)	9,586	4,356	1,419
Gross realized losses on sales	(3,575)	(1,587)	(88)
Investment securities gains, net	6,011	2,769	1,331
Available-for-sale securities, transfers, gains	1,400
Investment securities available for sale transferred to trading account assets at fair value	$ 1,890	$ 0	$ 0

Loans And Allowance For Loan 70

Loans And Allowance For Loan Losses (Narrative) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)Contract	Dec. 31, 2015USD ($)Contract	Dec. 31, 2014USD ($)Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 153,378,000				$ 168,370,000				$ 153,378,000	$ 168,370,000
Loans and leases receivable, impaired, interest lost on nonaccrual loans									8,900,000	10,500,000
Interest income recognized									8,196,000	9,522,000
Average recorded investment in impaired loans									274,515,000	358,254,000	$ 622,000,000
Accrued interest income recognized											14,900,000
Investments income recognized in impairment loans, excluding TDRs									0	0	0
Impaired financing receivable, recorded investment, nonaccrual status	53,700,000				77,900,000				$ 53,700,000	$ 77,900,000	$ 93,700,000
Subsequent default, number of contracts | Contract									2	7	15
Accruing troubled debt restructuring	195,800,000				223,900,000				$ 195,800,000	$ 223,900,000
Provision for losses on loans	$ 6,259,000	$ 5,671,000	$ 6,693,000	$ 9,377,000	$ 5,021,000	$ 2,956,000	$ 6,636,000	$ 4,397,000	28,000,000	19,010,000	$ 33,831,000
Troubled Debt Restructurings That Subsequently Defaulted [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modifications, post-modification recorded investment									181,000	12,500,000	$ 3,600,000
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial-type impaired loans									1,000,000
Interest Income Recorded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized									$ 3,500,000	4,300,000
Loss And Charged Off [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loan charge-off period (in days)									120 days
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loan substandard period (in days)									90 days
Accruing TDRs With Modifications And Renewals Completed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for losses on loans									$ 9,800,000	$ 12,600,000

Loans And Allowance For Loan 71

Loans And Allowance For Loan Losses (Loans Outstanding By Classification) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate	$ 7,365,974	$ 7,394,768
Total commercial and industrial	11,551,943	10,772,130
Total retail	4,964,465	4,292,766
Total loans	23,882,382	22,459,664
Deferred fees and costs, net	(25,991)	(30,099)	$ (30,800)
Total loans, net of deferred fees and costs	23,856,391	22,429,565
Home Equity Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	1,617,265	1,689,914
Total loans	1,617,265	1,689,914
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	2,296,604	1,938,683
Total loans	2,296,604	1,938,683
Credit Cards [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	232,413	240,851
Total loans	232,413	240,851
Other Retail Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	818,183	423,318
Total loans	818,183	423,318
Investment Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate	5,932,619	5,751,631
Total loans	5,932,619	5,751,631
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate	1,023,821	1,129,156
Total loans	1,023,821	1,129,156
Land Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate	409,534	513,981
Total loans	409,534	513,981
Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial and industrial	6,915,927	6,453,180
Total loans	6,915,927	6,453,180
Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial and industrial	4,636,016	4,318,950
Total loans	$ 4,636,016	$ 4,318,950

Loans And Allowance For Loan 72

Loans And Allowance For Loan Losses (Schedule Of Current, Accruing Past Due And Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	$ 23,663,898	$ 22,243,382
Accruing 30-89 Days Past Due	61,971	45,291
Accruing 90 Days or Greater Past Due	3,135	2,621
Total Accruing Past Due	65,106	47,912
Non-accrual	153,378	168,370
Total loans	23,882,382	22,459,664
Deferred fees and costs, net	25,991	30,099	$ 30,800
Home Equity Lines [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,585,228	1,667,552
Accruing 30-89 Days Past Due	10,013	5,882
Accruing 90 Days or Greater Past Due	473	0
Total Accruing Past Due	10,486	5,882
Non-accrual	21,551	16,480
Total loans	1,617,265	1,689,914
Consumer Mortgages [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	2,265,966	1,907,644
Accruing 30-89 Days Past Due	7,876	8,657
Accruing 90 Days or Greater Past Due	81	134
Total Accruing Past Due	7,957	8,791
Non-accrual	22,681	22,248
Total loans	2,296,604	1,938,683
Credit Cards [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	229,177	237,742
Accruing 30-89 Days Past Due	1,819	1,663
Accruing 90 Days or Greater Past Due	1,417	1,446
Total Accruing Past Due	3,236	3,109
Non-accrual	0	0
Total loans	232,413	240,851
Other Retail Loans [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	809,419	418,337
Accruing 30-89 Days Past Due	5,771	2,390
Accruing 90 Days or Greater Past Due	39	26
Total Accruing Past Due	5,810	2,416
Non-accrual	2,954	2,565
Total loans	818,183	423,318
Investment Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	5,924,225	5,726,307
Accruing 30-89 Days Past Due	2,958	2,284
Accruing 90 Days or Greater Past Due	0	0
Total Accruing Past Due	2,958	2,284
Non-accrual	5,436	23,040
Total loans	5,932,619	5,751,631
1-4 Family Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,000,590	1,105,914
Accruing 30-89 Days Past Due	4,962	6,300
Accruing 90 Days or Greater Past Due	161	103
Total Accruing Past Due	5,123	6,403
Non-accrual	18,108	16,839
Total loans	1,023,821	1,129,156
Land Acquisition [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	401,346	495,542
Accruing 30-89 Days Past Due	1,117	639
Accruing 90 Days or Greater Past Due	0	32
Total Accruing Past Due	1,117	671
Non-accrual	7,071	17,768
Total loans	409,534	513,981
Commercial Real Estate [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	7,326,161	7,327,763
Accruing 30-89 Days Past Due	9,037	9,223
Accruing 90 Days or Greater Past Due	161	135
Total Accruing Past Due	9,198	9,358
Non-accrual	30,615	57,647
Total loans	7,365,974	7,394,768
Commercial, Financial and Agricultural [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,846,591	6,391,036
Accruing 30-89 Days Past Due	9,542	12,222
Accruing 90 Days or Greater Past Due	720	785
Total Accruing Past Due	10,262	13,007
Non-accrual	59,074	49,137
Total loans	6,915,927	6,453,180
Owner-Occupied [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	4,601,356	4,293,308
Accruing 30-89 Days Past Due	17,913	5,254
Accruing 90 Days or Greater Past Due	244	95
Total Accruing Past Due	18,157	5,349
Non-accrual	16,503	20,293
Total loans	4,636,016	4,318,950
Commercial And Industrial [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	11,447,947	10,684,344
Accruing 30-89 Days Past Due	27,455	17,476
Accruing 90 Days or Greater Past Due	964	880
Total Accruing Past Due	28,419	18,356
Non-accrual	75,577	69,430
Total loans	11,551,943	10,772,130
Retail [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	4,889,790	4,231,275
Accruing 30-89 Days Past Due	25,479	18,592
Accruing 90 Days or Greater Past Due	2,010	1,606
Total Accruing Past Due	27,489	20,198
Non-accrual	47,186	41,293
Total loans	$ 4,964,465	$ 4,292,766

Loans And Allowance For Loan 73

Loans And Allowance For Loan Losses (Loan Portfolio Credit Exposure) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 23,882,382	$ 22,459,664
Performing, accrual of interest	256,600	303,700
Deferred fees and costs, net	25,991	30,099	$ 30,800
Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,617,265	1,689,914
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,296,604	1,938,683
Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	232,413	240,851
Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	818,183	423,318
Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,932,619	5,751,631
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,023,821	1,129,156
Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	409,534	513,981
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,365,974	7,394,768
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,551,943	10,772,130
Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,915,927	6,453,180
Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,636,016	4,318,950
Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 4,964,465	4,292,766
Allowance for loan and lease losses, percent of loan amount	50.00%
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 23,147,814	21,531,712
Pass [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,589,199	1,666,586
Pass [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,271,916	1,910,649
Pass [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	230,997	239,405
Pass [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	814,844	418,929
Pass [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,843,433	5,560,595
Pass [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	932,340	995,903
Pass [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	360,017	436,835
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,135,790	6,993,333
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,105,068	10,302,810
Pass [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,642,648	6,184,179
Pass [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,462,420	4,118,631
Pass [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,906,956	4,235,569
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	324,593	455,917
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] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	54,486	114,705
Special Mention [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	51,623	64,325
Special Mention [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	31,360	46,208
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	137,469	225,238
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	187,124	230,679
Special Mention [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	126,268	152,189
Special Mention [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	60,856	78,490
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	387,117	441,853
Substandard [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,774	20,456
Substandard [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,268	26,041
Substandard [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	637	480
Substandard [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,233	4,315
Substandard [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	34,700	76,331
Substandard [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,853	61,726
Substandard [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,897	30,574
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	85,450	168,631
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	251,755	221,930
Substandard [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	140,425	100,658
Substandard [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	111,330	121,272
Substandard [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	49,912	51,292
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	19,337	23,900
Doubtful [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,892	1,206
Doubtful [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,283	1,700
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	42	0
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	7,005	7,202
Doubtful [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	260	364
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,265	7,566
Doubtful [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,855	13,428
Doubtful [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,445	13,330
Doubtful [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,410	98
Doubtful [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,217	2,906
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,521	6,282
Loss [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,400	1,666
Loss [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	137	293
Loss [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	779	966
Loss [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	64	74
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 Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	141	3,283
Loss [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	141	2,824
Loss [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	459
Loss [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 3,380	$ 2,999

Loans And Allowance For Loan 74

Loans And Allowance For Loan Losses (Schedule Of Allowances For Loan Losses And Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 252,496				$ 261,317	$ 252,496	$ 261,317	$ 307,560
Allowance for loan losses of sold Memphis loans											(1,019)
Charge-offs									(57,960)	(57,339)	(113,538)
Recoveries									29,222	29,508	34,483
Provision for loan losses	$ 6,259	$ 5,671	$ 6,693	9,377	$ 5,021	$ 2,956	$ 6,636	4,397	28,000	19,010	33,831
Ending balance	251,758				252,496				251,758	252,496	261,317
Ending balance: individually evaluated for impairment	18,111				30,435				18,111	30,435	33,476
Ending balance: collectively evaluated for impairment	233,647				222,061				233,647	222,061	227,841
Ending balance: total loans	23,882,382				22,459,664				23,882,382	22,459,664	21,128,489
Ending balance: individually evaluated for impairment	249,496				301,800				249,496	301,800	442,148
Ending balance: collectively evaluated for impairment	23,632,886				22,157,864				23,632,886	22,157,864	20,686,341
Deferred fees and costs, net	25,991				30,099				25,991	30,099	30,800
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				87,133				101,471	87,133	101,471	127,646
Allowance for loan losses of sold Memphis loans											(281)
Charge-offs									(18,216)	(13,998)	(49,716)
Recoveries									15,226	13,644	11,787
Provision for loan losses									(2,327)	(13,984)	12,035
Ending balance	81,816				87,133				81,816	87,133	101,471
Ending balance: individually evaluated for impairment	7,916				18,969				7,916	18,969	21,755
Ending balance: collectively evaluated for impairment	73,900				68,164				73,900	68,164	79,716
Ending balance: total loans	7,365,974				7,394,768				7,365,974	7,394,768	6,926,602
Ending balance: individually evaluated for impairment	91,410				157,958				91,410	157,958	251,536
Ending balance: collectively evaluated for impairment	7,274,564				7,236,810				7,274,564	7,236,810	6,675,066
Commercial And Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				122,989				118,110	122,989	118,110	115,435
Allowance for loan losses of sold Memphis loans											(398)
Charge-offs									(25,039)	(22,583)	(38,941)
Recoveries									9,071	8,611	14,628
Provision for loan losses									18,757	18,851	27,386
Ending balance	125,778				122,989				125,778	122,989	118,110
Ending balance: individually evaluated for impairment	8,384				10,477				8,384	10,477	10,451
Ending balance: collectively evaluated for impairment	117,394				112,512				117,394	112,512	107,659
Ending balance: total loans	11,551,943				10,772,130				11,551,943	10,772,130	10,267,719
Ending balance: individually evaluated for impairment	120,560				105,599				120,560	105,599	146,026
Ending balance: collectively evaluated for impairment	11,431,383				10,666,531				11,431,383	10,666,531	10,121,693
Retail [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				42,374				41,736	42,374	41,736	41,479
Allowance for loan losses of sold Memphis loans											(340)
Charge-offs									(14,705)	(20,758)	(24,881)
Recoveries									4,925	7,253	8,068
Provision for loan losses									11,570	14,143	17,410
Ending balance	44,164				42,374				44,164	42,374	41,736
Ending balance: individually evaluated for impairment	1,811				989				1,811	989	1,270
Ending balance: collectively evaluated for impairment	42,353				41,385				42,353	41,385	40,466
Ending balance: total loans	4,964,465				4,292,766				4,964,465	4,292,766	3,934,168
Ending balance: individually evaluated for impairment	37,526				38,243				37,526	38,243	44,586
Ending balance: collectively evaluated for impairment	4,926,939				4,254,523				4,926,939	4,254,523	3,889,582
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 0				$ 0	0	0	23,000
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for loan losses									0	0	(23,000)
Ending balance	0				0				0	0	0
Ending balance: individually evaluated for impairment	0				0				0	0	0
Ending balance: collectively evaluated for impairment	0				0				0	0	0
Ending balance: total loans	0				0				0	0	0
Ending balance: individually evaluated for impairment	0				0				0	0	0
Ending balance: collectively evaluated for impairment	$ 0				$ 0				$ 0	$ 0	$ 0

Loans And Allowance For Loan 75

Loans And Allowance For Loan Losses (Schedule Of Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 28,751	$ 35,108
Unpaid Principal Balance, With no related allowance recorded	40,794	78,312
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	26,433	50,030
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	220,745	266,692
Unpaid Principal Balance, With allowance recorded	222,393	270,004
Related Allowance, With allowance recorded	18,111	30,435
Average Recorded Investment, With allowance recorded	248,082	308,224
Interest Income Recognized, With allowance recorded	8,196	9,522
Recorded Investment	249,496	301,800
Unpaid Principal Balance	263,187	348,316
Related Allowance	18,111	30,435
Average Recorded Investment in Impaired Loans	274,515	358,254	$ 622,000
Interest Income Recognized	8,196	9,522
Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,051	1,030
Unpaid Principal Balance, With no related allowance recorded	1,051	1,030
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	1,045	573
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	9,638	9,575
Unpaid Principal Balance, With allowance recorded	9,638	9,575
Related Allowance, With allowance recorded	971	206
Average Recorded Investment, With allowance recorded	9,668	8,318
Interest Income Recognized, With allowance recorded	432	346
Recorded Investment	10,689	10,605
Unpaid Principal Balance	10,689	10,605
Related Allowance	971	206
Average Recorded Investment in Impaired Loans	10,713	8,891
Interest Income Recognized	432	346
Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	744	814
Unpaid Principal Balance, With no related allowance recorded	814	941
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	870	995
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	20,953	22,173
Unpaid Principal Balance, With allowance recorded	19,834	23,297
Related Allowance, With allowance recorded	673	651
Average Recorded Investment, With allowance recorded	20,993	26,044
Interest Income Recognized, With allowance recorded	1,014	1,229
Recorded Investment	21,697	22,987
Unpaid Principal Balance	20,648	24,238
Related Allowance	673	651
Average Recorded Investment in Impaired Loans	21,863	27,039
Interest Income Recognized	1,014	1,229
Credit Cards [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0	0
Unpaid Principal Balance, With no related allowance recorded	0	0
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	0	0
Unpaid Principal Balance, With allowance recorded	0	0
Related Allowance, With allowance recorded	0	0
Average Recorded Investment, With allowance recorded	0	0
Interest Income Recognized, With allowance recorded	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment in Impaired Loans	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
Unpaid Principal Balance, With no related allowance recorded	0	0
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	5,140	4,651
Unpaid Principal Balance, With allowance recorded	5,140	4,651
Related Allowance, With allowance recorded	167	132
Average Recorded Investment, With allowance recorded	5,062	5,105
Interest Income Recognized, With allowance recorded	303	323
Recorded Investment	5,140	4,651
Unpaid Principal Balance	5,140	4,651
Related Allowance	167	132
Average Recorded Investment in Impaired Loans	5,062	5,105
Interest Income Recognized	303	323
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	3,490	20,109
Unpaid Principal Balance, With no related allowance recorded	10,975	57,525
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	9,803	28,068
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	87,920	137,849
Unpaid Principal Balance, With allowance recorded	87,926	138,419
Related Allowance, With allowance recorded	7,916	18,969
Average Recorded Investment, With allowance recorded	108,091	169,694
Interest Income Recognized, With allowance recorded	3,283	4,685
Recorded Investment	91,410	157,958
Unpaid Principal Balance	98,901	195,944
Related Allowance	7,916	18,969
Average Recorded Investment in Impaired Loans	117,894	197,762
Interest Income Recognized	3,283	4,685
Investment Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	748	10,051
Unpaid Principal Balance, With no related allowance recorded	793	12,946
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	5,384	11,625
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	32,729	62,305
Unpaid Principal Balance, With allowance recorded	32,729	62,305
Related Allowance, With allowance recorded	2,267	10,070
Average Recorded Investment, With allowance recorded	42,836	73,211
Interest Income Recognized, With allowance recorded	1,699	2,131
Recorded Investment	33,477	72,356
Unpaid Principal Balance	33,522	75,251
Related Allowance	2,267	10,070
Average Recorded Investment in Impaired Loans	48,220	84,836
Interest Income Recognized	1,699	2,131
1-4 Family Properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,850	1,507
Unpaid Principal Balance, With no related allowance recorded	5,847	5,526
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	1,461	2,546
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	38,972	51,376
Unpaid Principal Balance, With allowance recorded	38,978	51,376
Related Allowance, With allowance recorded	4,754	6,184
Average Recorded Investment, With allowance recorded	47,806	61,690
Interest Income Recognized, With allowance recorded	1,098	1,618
Recorded Investment	40,822	52,883
Unpaid Principal Balance	44,825	56,902
Related Allowance	4,754	6,184
Average Recorded Investment in Impaired Loans	49,267	64,236
Interest Income Recognized	1,098	1,618
Land Acquisition [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	892	8,551
Unpaid Principal Balance, With no related allowance recorded	4,335	39,053
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	2,958	13,897
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	16,219	24,168
Unpaid Principal Balance, With allowance recorded	16,219	24,738
Related Allowance, With allowance recorded	895	2,715
Average Recorded Investment, With allowance recorded	17,449	34,793
Interest Income Recognized, With allowance recorded	486	936
Recorded Investment	17,111	32,719
Unpaid Principal Balance	20,554	63,791
Related Allowance	895	2,715
Average Recorded Investment in Impaired Loans	20,407	48,690
Interest Income Recognized	486	936
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	23,466	13,155
Unpaid Principal Balance, With no related allowance recorded	27,954	18,816
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	14,715	20,394
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	97,094	92,444
Unpaid Principal Balance, With allowance recorded	99,855	94,062
Related Allowance, With allowance recorded	8,384	10,477
Average Recorded Investment, With allowance recorded	104,268	99,063
Interest Income Recognized, With allowance recorded	3,164	2,939
Recorded Investment	120,560	105,599
Unpaid Principal Balance	127,809	112,878
Related Allowance	8,384	10,477
Average Recorded Investment in Impaired Loans	118,983	119,457
Interest Income Recognized	3,164	2,939
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	17,958	4,393
Unpaid Principal Balance, With no related allowance recorded	20,577	7,606
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	6,321	5,737
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	43,386	42,914
Unpaid Principal Balance, With allowance recorded	45,913	44,374
Related Allowance, With allowance recorded	5,687	8,339
Average Recorded Investment, With allowance recorded	51,968	43,740
Interest Income Recognized, With allowance recorded	1,218	1,125
Recorded Investment	61,344	47,307
Unpaid Principal Balance	66,490	51,980
Related Allowance	5,687	8,339
Average Recorded Investment in Impaired Loans	58,289	49,477
Interest Income Recognized	1,218	1,125
Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	5,508	8,762
Unpaid Principal Balance, With no related allowance recorded	7,377	11,210
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	8,394	14,657
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	53,708	49,530
Unpaid Principal Balance, With allowance recorded	53,942	49,688
Related Allowance, With allowance recorded	2,697	2,138
Average Recorded Investment, With allowance recorded	52,300	55,323
Interest Income Recognized, With allowance recorded	1,946	1,814
Recorded Investment	59,216	58,292
Unpaid Principal Balance	61,319	60,898
Related Allowance	2,697	2,138
Average Recorded Investment in Impaired Loans	60,694	69,980
Interest Income Recognized	1,946	1,814
Retail [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,795	1,844
Unpaid Principal Balance, With no related allowance recorded	1,865	1,971
Related Allowance, With no related allowance recorded	0	0
Average Recorded Investment, With no related allowance recorded	1,915	1,568
Interest Income Recognized, With no related allowance recorded	0	0
Recorded Investment, With allowance recorded	35,731	36,399
Unpaid Principal Balance, With allowance recorded	34,612	37,523
Related Allowance, With allowance recorded	1,811	989
Average Recorded Investment, With allowance recorded	35,723	39,467
Interest Income Recognized, With allowance recorded	1,749	1,898
Recorded Investment	37,526	38,243
Unpaid Principal Balance	36,477	39,494
Related Allowance	1,811	989
Average Recorded Investment in Impaired Loans	37,638	41,035
Interest Income Recognized	$ 1,749	$ 1,898

Loans And Allowance For Loan 76

Loans And Allowance For Loan Losses (Troubled Debt Restructurings) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)Contract	Dec. 31, 2015USD ($)Contract	Dec. 31, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	169	262	272
Post-modification balance for loans modified or renewed	$ 52,994	$ 80,386	$ 114,298
Write-down	$ 0	$ 4,000	$ 163
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	5	53	20
Post-modification balance for loans modified or renewed	$ 348	$ 5,731	$ 2,786
Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	7	15	19
Post-modification balance for loans modified or renewed	$ 464	$ 1,906	$ 3,602
Credit Card Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0
Post-modification balance for loans modified or renewed	$ 0	$ 0	$ 0
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	28	27	27
Post-modification balance for loans modified or renewed	$ 2,650	$ 1,147	$ 1,229
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	57	66	99
Post-modification balance for loans modified or renewed	$ 16,429	$ 56,424	$ 37,148
Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	4	11	15
Post-modification balance for loans modified or renewed	$ 5,343	$ 32,025	$ 14,236
1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	39	43	68
Post-modification balance for loans modified or renewed	$ 6,987	$ 22,253	$ 13,103
Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	14	12	16
Post-modification balance for loans modified or renewed	$ 4,099	$ 2,146	$ 9,809
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	72	101	107
Post-modification balance for loans modified or renewed	$ 33,103	$ 15,178	$ 69,533
Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	63	91	89
Post-modification balance for loans modified or renewed	$ 24,669	$ 9,697	$ 31,267
Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	9	10	18
Post-modification balance for loans modified or renewed	$ 8,434	$ 5,481	$ 38,266
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	40	95	66
Post-modification balance for loans modified or renewed	$ 3,462	$ 8,784	$ 7,617
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	14,852	2,398
Principal Forgiveness [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Principal Forgiveness [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Principal Forgiveness [Member] | Credit Card Receivable [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Principal Forgiveness [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	14,823	2,338
Principal Forgiveness [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Principal Forgiveness [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	14,823	0
Principal Forgiveness [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	2,338
Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	29	60
Principal Forgiveness [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	29	60
Principal Forgiveness [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Principal Forgiveness [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Below Market Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	33,749	41,222	59,020
Below Market Interest Rate [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	225	2,826	2,335
Below Market Interest Rate [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	413	1,011	2,735
Below Market Interest Rate [Member] | Credit Card Receivable [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Below Market Interest Rate [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	394	444	663
Below Market Interest Rate [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	7,324	30,333	19,817
Below Market Interest Rate [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	1,825	25,052	8,423
Below Market Interest Rate [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	5,499	4,667	6,611
Below Market Interest Rate [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	614	4,783
Below Market Interest Rate [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	25,393	6,608	33,470
Below Market Interest Rate [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	17,509	3,191	10,066
Below Market Interest Rate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	7,884	3,417	23,404
Below Market Interest Rate [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	1,032	4,281	5,733
Term Extensions and/or Other Concessions [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	19,245	24,312	52,880
Term Extensions and/or Other Concessions [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	123	2,905	451
Term Extensions and/or Other Concessions [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	51	895	867
Term Extensions and/or Other Concessions [Member] | Credit Card Receivable [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	0	0	0
Term Extensions and/or Other Concessions [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	2,256	703	566
Term Extensions and/or Other Concessions [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	9,105	11,268	14,993
Term Extensions and/or Other Concessions [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	3,518	6,973	5,813
Term Extensions and/or Other Concessions [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	1,488	2,763	6,492
Term Extensions and/or Other Concessions [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	4,099	1,532	2,688
Term Extensions and/or Other Concessions [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	7,710	8,541	36,003
Term Extensions and/or Other Concessions [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	7,160	6,477	21,141
Term Extensions and/or Other Concessions [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	550	2,064	14,862
Term Extensions and/or Other Concessions [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Post-modification balance for loans modified or renewed	$ 2,430	$ 4,503	$ 1,884

Loans And Allowance For Loan 77

Loans And Allowance For Loan Losses (Summary Of Loans To Executive Officers And Directors, Including Their Associates) (Details) - Executive Officer And Directors Changes [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at December 31, 2015	$ 41,441
New loans	193,477
Repayments	(179,345)
Loans charged-off	0
Balance at December 31, 2016	$ 55,573

Other Comprehensive Income (L78

Other Comprehensive Income (Loss) (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Accumulated other comprehensive loss	$ 55,659	$ 29,819
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member] | Valuation Allowance of Deferred Tax Assets [Member]
Class of Stock [Line Items]
Accumulated other comprehensive loss	12,100
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 loss	$ 13,300

Other Comprehensive Income (L79

Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	$ 3,000,196
Other comprehensive income before reclassifications	(22,342)	$ (15,663)	$ 29,284
Amounts reclassified from accumulated other comprehensive income (loss)	(3,498)	(1,551)	(631)
Other comprehensive (loss) income, Net of Tax Amount	(25,840)	(17,214)	28,653
Ending balance	2,927,924	3,000,196
AOCI Attributable to Parent [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(29,819)	(12,605)	(41,258)
Other comprehensive (loss) income, Net of Tax Amount	(25,840)	(17,214)	28,653
Ending balance	(55,659)	(29,819)	(12,605)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(12,504)	(12,824)	(13,099)
Other comprehensive income before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	287	320	275
Other comprehensive (loss) income, Net of Tax Amount	287	320	275
Ending balance	(12,217)	(12,504)	(12,824)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(18,222)	(713)	(28,936)
Other comprehensive income before reclassifications	(22,405)	(15,806)	29,041
Amounts reclassified from accumulated other comprehensive income (loss)	(3,697)	(1,703)	(818)
Other comprehensive (loss) income, Net of Tax Amount	(26,102)	(17,509)	28,223
Ending balance	(44,324)	(18,222)	(713)
Post-retirement Unfunded Health Benefit [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	907	932	777
Other comprehensive income before reclassifications	63	143	243
Amounts reclassified from accumulated other comprehensive income (loss)	(88)	(168)	(88)
Other comprehensive (loss) income, Net of Tax Amount	(25)	(25)	155
Ending balance	$ 882	$ 907	$ 932

Other Comprehensive Income (L80

Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									$ (123,623)	$ (118,644)	$ (109,408)
Loss on early extinguishment of debt, net									(4,735)	(1,533)	0
Investment securities gains, net									6,011	2,769	1,331
Salaries and other personnel expense									(755,923)	(717,655)	(744,998)
Income tax (expense) benefit	$ (39,519)	$ (37,375)	$ (33,574)	$ (31,199)	$ (32,342)	$ (36,058)	$ (32,242)	$ (31,849)	(141,667)	(132,491)	(107,310)
Net income available to common shareholders	$ 65,990	$ 62,686	$ 57,898	$ 49,972	$ 55,839	$ 55,369	$ 53,233	$ 51,404	236,546	215,844	185,011
Available-for-sale securities, transfers, gains									1,400
Investment securities available for sale transferred to trading account assets at fair value									1,890	0	0
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on early extinguishment of debt, net									(130)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									(270)	(448)	(448)
Loss on early extinguishment of debt, net									(197)	(73)	0
Income tax (expense) benefit									180	201	173
Net income available to common shareholders									(287)	(320)	(275)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains, net									6,011	2,769	1,331
Income tax (expense) benefit									(2,314)	(1,066)	(513)
Net income available to common shareholders									3,697	1,703	818
Reclassification out of Accumulated Other Comprehensive Income [Member] | Post-retirement Unfunded Health Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and other personnel expense									144	272	144
Income tax (expense) benefit									(56)	(104)	(56)
Net income available to common shareholders									$ 88	$ 168	$ 88

Premises and Equipment (Narrati

Premises and Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Capital lease obligations	$ 1,600	$ 1,700
Operating leases, rent expense	21,400	23,100	$ 22,800
Depreciation and amortization expense	37,100	35,300	33,900
Premises and equipment transferred to other properties held for sale	25,231	$ 2,340	$ 16,613
Disposed assets from furniture and equipment	$ 68,400

Premises and Equipment (Schedul

Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 915,751	$ 1,001,429
Less: Accumulated depreciation and amortization	(498,266)	(556,274)
Premises and equipment, net	417,485	445,155
Land [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	97,080	106,656
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 377,754	403,437
Building and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life (in years)	10 years
Building and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life (in years)	40 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 41,355	41,095
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life (in years)	10 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life (in years)	40 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 370,458	406,121
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life (in years)	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life (in years)	40 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 29,104	$ 44,120

Premises and Equipment (Operati

Premises and Equipment (Operating Leases) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,017	$ 27,527
2,018	28,289
2,019	25,484
2,020	24,579
2,021	22,247
Thereafter	154,219
Total	$ 282,345

Goodwill And Other Intangible84

Goodwill And Other Intangible Assets (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)reporting_unit	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Oct. 01, 2016USD ($)	Jun. 30, 2015USD ($)
Goodwill [Line Items]
Goodwill	$ 59,678	$ 24,431	$ 24,431
Number of reporting units | reporting_unit	2
Aggregate amortization	$ 521	503	603
Aggregate estimated amortization expense in 2017	1,100
Aggregate estimated amortization expense in 2018	1,200
Aggregate estimated amortization expense in 2019	1,200
Aggregate estimated amortization expense in 2020	1,200
Aggregate estimated amortization expense in 2021	1,200
Global One [Member]
Goodwill [Line Items]
Goodwill				$ 35,247
Intangible assets	13,400			$ 13,400
Intangible assets, gross	14,000
Amortization of intangible assets	817
Intangible assets, net	13,200
Trust Services [Member]
Goodwill [Line Items]
Goodwill	24,431	24,431	24,431		$ 77,400
Goodwill, fair value					129,200
Amount of fair value in excess of carrying amount					$ 51,800
Percentage of fair value in excess of carrying amount					40.00%
Synovus Bank [Member]
Goodwill [Line Items]
Goodwill	$ 35,247	$ 0	$ 0

Goodwill And Other Intangible85

Goodwill And Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill	$ 24,431	$ 24,431
Accumulated impairment losses	0	0
Goodwill acquired during year	35,247
Goodwill	59,678	24,431
Trust Services [Member]
Goodwill [Roll Forward]
Goodwill	24,431	24,431
Accumulated impairment losses	0	0
Goodwill acquired during year	0
Goodwill	24,431	24,431
Synovus Bank [Member]
Goodwill [Roll Forward]
Goodwill	0	0
Accumulated impairment losses	0	0
Goodwill acquired during year	35,247
Goodwill	$ 35,247	$ 0

Other Assets (Balances) (Detail

Other Assets (Balances) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Assets [Abstract]
Cash surrender value of bank-owned life insurance	$ 378,830	$ 338,002
Federal Reserve Bank and FHLB stock	169,864	68,288
Accrued interest receivable	70,393	65,218
Prepaid expenses	35,542	33,348
Accounts receivable	29,821	19,692
Private equity investments	25,493	28,018
Derivative asset positions	20,623	27,139
Other properties held for sale	14,830	10,671
SBA/GGL servicing assets, net	4,451	4,287
Miscellaneous other assets	63,373	55,511
Total other assets	$ 813,220	$ 650,174

Other Assets (Narrative) (Detai

Other Assets (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Assets [Abstract]
Separate account life insurance	$ 15	$ 32
Investments, fair value	$ 14

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Interest-bearing Deposit Liabilities [Abstract]
Interest bearing demand deposits	$ 4,768,313	$ 4,377,407
Money market accounts, excluding brokered deposits	7,251,093	7,042,350
Savings accounts	929,402	714,410
Time deposits, excluding brokered deposits	3,234,465	3,300,004
Brokered deposits	1,378,983	1,075,520
Total interest bearing deposits	17,562,256	16,509,691
Aggregate amount of time deposits of $250,000 or more	829,500	$ 774,300
Time Deposits, by Maturity [Abstract]
Maturing within one year	2,424,336
Between 1 — 2 years	922,828
2 — 3 years	278,722
3 — 4 years	204,813
4 — 5 years	99,288
Thereafter	22,481
Time deposits	$ 3,952,468

Long-term Debt and Short-term89

Long-term Debt and Short-term Borrowings (Schedule of Long-term Debt Instruments) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 07, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 2,160,881,000	$ 2,186,893,000
Interest rate at period end	0.08%	0.08%		0.08%
7.875% Senior Notes due February 15, 2019 [Member] | To be paid at Maturity [Member]
Debt Instrument [Line Items]
Stated percentage	7.875%
Extinguishment of debt, amount	$ 300,000,000
5.75% Subordinated Notes, Due December 15, 2025 [Member]
Debt Instrument [Line Items]
Subordinated notes			$ 250,000,000
Parent Company [Member]
Debt Instrument [Line Items]
Hedge-related basis adjustments	873,000	$ 4,018,000
Long-term debt	834,252,000	960,185,000
Parent Company [Member] | 5.125% Subordinated Notes due June 15, 2017 [Member]
Debt Instrument [Line Items]
Subordinated notes	$ 278,480,000	402,812,000
Stated percentage	5.125%
Debt, face amount	$ 278,600,000	403,300,000
Parent Company [Member] | 7.875% Senior Notes due February 15, 2019 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	297,763,000	296,711,000
Parent Company [Member] | 5.75% Subordinated Notes, Due December 15, 2025 [Member]
Debt Instrument [Line Items]
Subordinated notes	247,136,000	$ 246,644,000
Stated percentage		5.75%
Debt, face amount	$ 250,000,000
Parent Company [Member] | 5.75% Subordinated Notes, Due December 15, 2025 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	4.182%
Parent Company [Member] | LIBOR Plus 1.80% debentures, due April 19, 2035 with quarterly interest payments and principal to be paid at maturity (rate of 2.04% and 2.11% at December 31, 2013 and 2012, respectively)
Debt Instrument [Line Items]
Unsecured debt	$ 10,000,000	$ 10,000,000
Debt, face amount	$ 10,000,000
Interest rate at period end	2.76%	2.31%
Parent Company [Member] | LIBOR Plus 1.80% debentures, due April 19, 2035 with quarterly interest payments and principal to be paid at maturity (rate of 2.04% and 2.11% at December 31, 2013 and 2012, respectively) | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.80%
Synovus Bank [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,326,629,000	$ 1,226,708,000
Synovus Bank [Member] | FHLB Advances [Member]
Debt Instrument [Line Items]
FHLB advances with interest and principal payments due at various maturity dates through 2018	$ 1,325,000,000	$ 1,225,000,000
Weighted average interest rate	0.64%	0.46%
Synovus Bank [Member] | FHLB Advances [Member] | Minimum [Member]
Debt Instrument [Line Items]
Stated percentage	0.63%
Synovus Bank [Member] | FHLB Advances [Member] | Maximum [Member]
Debt Instrument [Line Items]
Stated percentage	0.66%
Synovus Bank [Member] | Other Notes Payable and Capital Leases [Member]
Debt Instrument [Line Items]
Other notes payable and capital leases with interest and principal payments due at various maturity dates through 2031	$ 1,629,000	$ 1,708,000
Weighted average interest rate	1.59%

Long-term Debt and Short-term90

Long-term Debt and Short-term Borrowings (Principal Payments on Long-term Debt) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
2,017	$ 278,679
2,018	89
2,019	575,090
2,020	350,092
2,021	450,097
Thereafter	511,173
Total long-term debt	2,165,220
Parent Company [Member]
Debt Instrument [Line Items]
2,017	278,591
2,018	0
2,019	300,000
2,020	0
2,021	0
Thereafter	260,000
Total long-term debt	838,591
Synovus Bank [Member]
Debt Instrument [Line Items]
2,017	88
2,018	89
2,019	275,090
2,020	350,092
2,021	450,097
Thereafter	251,173
Total long-term debt	$ 1,326,629

Long-term Debt and Short-term91

Long-term Debt and Short-term Borrowings (Components of Short-term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Total balance at December 31,	$ 159,699	$ 177,025	$ 126,916
Weighted average interest rate at December 31,	0.08%	0.08%	0.08%
Maximum month end balance during the year	$ 286,175	$ 250,453	$ 247,170
Average amount outstanding during the year	$ 216,593	$ 205,305	$ 198,085
Weighted average interest rate during the year	0.09%	0.08%	0.11%

Long-term Debt and Short Term B

Long-term Debt and Short Term Borrowings (Narrative) (Details) - USD ($)	Dec. 07, 2015	Dec. 31, 2015	Dec. 31, 2016	Jan. 31, 2016
Loans Receivable [Member]
Debt Instrument [Line Items]
Recorded balance loans receivable		$ 3,260,000,000	$ 3,250,000,000
5.125% Subordinated Notes due June 15, 2017 [Member]
Debt Instrument [Line Items]
Repurchased face amount		46,700,000		$ 124,700,000
Loss on repurchase of debt		$ 1,500,000	$ 4,700,000
5.75% Subordinated Notes, Due December 15, 2025 [Member]
Debt Instrument [Line Items]
Subordinated notes	$ 250,000,000
Proceeds from issuance of debt	$ 246,600,000

Shareholders' Equity (Changes

Shareholders' Equity (Changes in Shares by Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding	122,266,106	129,547,032
Issuance of common stock for acquisition	$ 26,592
Stock options exercised	297,225	338,808	178,176
Preferred Shares Issued [Member] | Series C Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	5,200,000	5,200,000	5,200,000
Balance	5,200,000	5,200,000	5,200,000
Common Shares Issued [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	140,592,000	139,950,000	139,721,000
Common stock, shares outstanding	122,266,000	129,547,000	136,123,000	138,908,000
Issuance of common stock for acquisition	$ 821
Restricted share unit activity	316,000	304,000	52,000
Stock options exercised	297,000	338,000	177,000
Repurchase of common stock	(8,715,000)	(7,218,000)	(3,014,000)
Balance	142,026,000	140,592,000	139,950,000
Treasury Shares Held [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	11,045,000	3,827,000	813,000
Restricted share unit activity	0	0	0
Stock options exercised	0	0	0
Repurchase of common stock	8,715,000	7,218,000	3,014,000
Balance	19,760,000	11,045,000	3,827,000

Shareholders' Equity (Narrativ

Shareholders' Equity (Narrative) (Details)	Oct. 01, 2016USD ($)shares	Apr. 24, 2014	Jan. 31, 2015shares	Dec. 31, 2015USD ($)shares	Sep. 30, 2015USD ($)	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)shares	Sep. 30, 2015USD ($)shares	Dec. 31, 2014USD ($)shares	Oct. 31, 2014USD ($)
Class of Stock [Line Items]
Common stock, shares issued (in shares) | shares				140,592,409		142,025,720	140,592,409
Fair value of common stock issued				$ 140,592,000		$ 142,026,000	$ 140,592,000
Stock Repurchased During Period, Value						$ 263,084,000	$ 199,221,000		$ 88,113,000
Stock split, conversion ratio		0.1429
Common stock, shares authorized | shares				342,857,143		342,857,143	342,857,143
Repurchase of Common Stock 300 Million [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 300,000,000			$ 300,000,000
Stock repurchase program, period in force					15 months
Repurchase of Common Stock 300 Million [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchased During Period, Value						$ 262,900,000
Repurchase of common stock | shares						8,700,000
Stock repurchase program, repurchased amount				$ 37,100,000
Stock repurchase program, shares repurchased | shares				1,200,000
Open Market Transactions [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program, repurchased amount						$ 212,900,000	$ 161,900,000	$ 175,000,000
Stock repurchase program, shares repurchased | shares						7,300,000	5,700,000	6,200,000
Accelerated Share Repurchase Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount										$ 75,000,000
Stock repurchase program, repurchased amount						$ 50,000,000
Stock repurchase program, shares repurchased | shares			392,000			1,400,000			2,500,000
Repurchase of Common Stock 250 Million [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program, repurchased amount					$ 250,000,000
Stock repurchase program, shares repurchased | shares						9,100,000
Global One [Member]
Class of Stock [Line Items]
Consideration transferred	$ 30,000,000
Common stock, shares issued (in shares) | shares	821,000
Fair value of common stock issued	$ 26,592,000
Cash paid	$ 3,408,000

Regulatory Capital (Details)

Regulatory Capital (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	2.50%
Capital conservation buffer period	3 years
Well-capitalized status,Tier 1 capital ratio	8.00%
Significant subsidiary, assets or net income as percentage of consolidated total, threshold	10.00%
Tier I capital
Tier III capital, Actual	$ 2,685,880	$ 2,660,016
Tier III capital, For Capital Adequacy Purposes	1,599,725	1,538,637
Common equity tier I capital (transitional)
Common equity tier 1 capital (transitional), Actual	2,654,287	2,660,016
Common equity tier 1 capital (transitional), For Capital Adequacy Purposes	1,199,794	1,153,977
Total risk-based capital
Total risk-based capital, Actual	3,201,268	3,255,758
Total risk-based capital, For Capital Adequacy Purposes	$ 2,132,966	$ 2,051,515
Tier I capital ratio
Tier III capital ratio, Actual	10.07%	10.37%
Tier III capital ratio, For Capital Adequacy Purposes	6.00%	6.00%
Common equity tier I capital ratio (transitional)
Common equity tier I capital ratio (transitional), Actual	9.96%	10.37%
Common equity tier I capital ratio (transitional), For Capital Adequacy Purposes	4.50%	4.50%
Common equity tier I capital ratio (transitional), To Be Well Capitalized Under Prompt Corrective Action Provisions	6.50%
Total risk-based capital ratio
Total risk-based capital ratio, Actual	12.01%	12.70%
Total risk-based capital ratio, For Capital Adequacy Purposes	8.00%	8.00%
Total risk-based capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions	10.00%
Leverage ratio
Leverage ratio, Actual	8.99%	9.43%
Leverage ratio, For Capital Adequacy Purposes	4.00%	4.00%
Leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions	5.00%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	0.625%
Synovus Bank [Member]
Tier I capital
Tier III capital, Actual	$ 3,187,583	$ 3,136,132
Tier III capital, For Capital Adequacy Purposes	1,597,302	1,535,541
Tier III capital, To Be Well Capitalized Under Prompt Corrective Action Provisions	2,129,736	2,047,388
Common equity tier I capital (transitional)
Common equity tier 1 capital (transitional), Actual	3,187,583	3,136,132
Common equity tier 1 capital (transitional), For Capital Adequacy Purposes	1,197,976	1,151,656
Common equity tier 1 capital (transitional), To Be Well Capitalized Under Prompt Corrective Action Provisions	1,730,410	1,663,503
Total risk-based capital
Total risk-based capital, Actual	3,441,563	3,390,764
Total risk-based capital, For Capital Adequacy Purposes	2,129,736	2,047,388
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 2,662,169	$ 2,559,235
Tier I capital ratio
Tier III capital ratio, Actual	11.97%	12.25%
Tier III capital ratio, For Capital Adequacy Purposes	6.00%	6.00%
Tier III capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions	8.00%	8.00%
Common equity tier I capital ratio (transitional)
Common equity tier I capital ratio (transitional), Actual	11.97%	12.25%
Common equity tier I capital ratio (transitional), For Capital Adequacy Purposes	4.50%	4.50%
Common equity tier I capital ratio (transitional), To Be Well Capitalized Under Prompt Corrective Action Provisions	6.50%	6.50%
Total risk-based capital ratio
Total risk-based capital ratio, Actual	12.93%	13.25%
Total risk-based capital ratio, For Capital Adequacy Purposes	8.00%	8.00%
Total risk-based capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions	10.00%	10.00%
Leverage ratio
Leverage ratio, Actual	10.68%	11.15%
Leverage ratio, For Capital Adequacy Purposes	4.00%	4.00%
Leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions	5.00%	5.00%

Net Income Per Common Share (Sc

Net Income Per Common Share (Schedule Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 68,549	$ 65,245	$ 60,457	$ 52,531	$ 58,398	$ 57,928	$ 55,792	$ 53,963	$ 246,784	$ 226,082	$ 195,249
Dividends on preferred stock									10,238	10,238	10,238
Net income available to common shareholders	$ 65,990	$ 62,686	$ 57,898	$ 49,972	$ 55,839	$ 55,369	$ 53,233	$ 51,404	$ 236,546	$ 215,844	$ 185,011
Weighted average common shares outstanding									124,389	132,423	138,495
Potentially dilutive shares from outstanding equity-based awards									689	778	659
Weighted average diluted common shares									125,078	133,201	139,154
Net income per common share, basic (per share)	$ 0.54	$ 0.51	$ 0.46	$ 0.39	$ 0.43	$ 0.42	$ 0.40	$ 0.38	$ 1.90	$ 1.63	$ 1.34
Net income per common share, diluted (per share)	$ 0.54	$ 0.51	$ 0.46	$ 0.39	$ 0.43	$ 0.42	$ 0.40	$ 0.38	$ 1.89	$ 1.62	$ 1.33

Net Income Per Common Share (Na

Net Income Per Common Share (Narrative) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Potentially dilutive shares	2.2	2.8	3.3

Fair Value Accounting (Financia

Fair Value Accounting (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 9,314	$ 5,097
Fair Value	3,718,195	3,587,818
Private equity investments	25,493	28,018
Derivative asset positions	20,623	27,139
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,890	0
Fair Value	114,676	56,102
Private equity investments	0	0
Derivative asset positions	0	0
Other liabilities	0
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	7,424	5,097
Fair Value	3,601,723	3,529,971
Private equity investments	0	870
Derivative asset positions	20,623	27,139
Other liabilities	0
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value	1,796	1,745
Private equity investments	25,493	27,148
Derivative asset positions	0	0
Other liabilities	14,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,314	5,097
Mortgage loans held for sale	51,545	59,275
Fair Value	3,718,195	3,587,818
Private equity investments	25,493	28,018
Mutual funds held in rabbi trusts	11,479	10,664
Derivative asset positions	20,623	27,139
Other liabilities	14,000
Trading account liabilities		1,032
Derivative liabilities	23,299	27,445
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,890	0
Mortgage loans held for sale	0	0
Fair Value	114,676	56,102
Private equity investments	0	0
Mutual funds held in rabbi trusts	11,479	10,664
Derivative asset positions	0	0
Other liabilities	0
Trading account liabilities		0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	7,424	5,097
Mortgage loans held for sale	51,545	59,275
Fair Value	3,601,723	3,529,971
Private equity investments	0	870
Mutual funds held in rabbi trusts	0	0
Derivative asset positions	20,623	27,139
Other liabilities	0
Trading account liabilities		1,032
Derivative liabilities	17,531	26,030
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
Fair Value	1,796	1,745
Private equity investments	25,493	27,148
Mutual funds held in rabbi trusts	0	0
Derivative asset positions	0	0
Other liabilities	14,000
Trading account liabilities		0
Derivative liabilities	5,768	1,415
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	17,531	26,030
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	17,531	26,030
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	5,768	1,415
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	5,768	1,415
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	3,460	2,922
Fair Value	174,202	210,004
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	3,460	2,922
Fair Value	174,202	210,004
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value	0	0
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	3,438	1,078
Fair Value	890,442	529,597
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued by U.S. Government Sponsored Enterprises [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued by U.S. Government Sponsored Enterprises [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	3,438	1,078
Fair Value	890,442	529,597
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued by U.S. Government Sponsored Enterprises [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | State and Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	426	1,097
Fair Value	2,794	4,434
Fair Value, Measurements, Recurring [Member] | State and Municipal Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | State and Municipal Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	426	1,097
Fair Value	2,794	4,434
Fair Value, Measurements, Recurring [Member] | State and Municipal Securities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,990
Fair Value	19,840	19,803
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,890
Fair Value	3,092	3,073
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	100
Fair Value	14,952	14,985
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,796	1,745
Fair Value, Measurements, Recurring [Member] | All Other Mortgage-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Measurements, Recurring [Member] | All Other Mortgage-backed Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Measurements, Recurring [Member] | All Other Mortgage-backed Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Measurements, Recurring [Member] | All Other Mortgage-backed Securities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	107,802	43,357
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	107,802	43,357
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | US Government Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	12,993	13,623
Fair Value, Measurements, Recurring [Member] | US Government Agencies Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | US Government Agencies Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	12,993	13,623
Fair Value, Measurements, Recurring [Member] | US Government Agencies Securities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Securities Issued By U S Government Sponsored Enterprises [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		126,909
Fair Value, Measurements, Recurring [Member] | Securities Issued By U S Government Sponsored Enterprises [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		0
Fair Value, Measurements, Recurring [Member] | Securities Issued By U S Government Sponsored Enterprises [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		126,909
Fair Value, Measurements, Recurring [Member] | Securities Issued By U S Government Sponsored Enterprises [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		0
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]
Fair Value	2,506,340	2,630,419
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,506,340	2,630,419
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3,782	9,672
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3,782	9,672
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	17,157	25,580
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	0	0
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	17,157	25,580
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	0	0
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	3,466	1,559
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	0	0
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	3,466	1,559
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset positions	$ 0	$ 0

Fair Value Accounting (Changes

Fair Value Accounting (Changes In Fair Value Included In Consolidated Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Mortgage loans held for sale	$ (667)	$ (742)	$ 1,399
Fair value	51,545	59,275	63,328
Unpaid principal balance	51,114	58,177	61,488
Fair value less aggregate unpaid principal balance	$ 431	$ 1,098	$ 1,840

Fair Value Accounting (Chang100

Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	$ 0
Included in earnings	0
Unrealized gains included in other comprehensive income	0
Additions	(14,000)
Sales	0
Issuances	0
Settlements	0
Transfers in and/or out of Level 3	0
Ending balance, December 31,	(14,000)	$ 0
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	0
Visa Derivative [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	(1,415)	(1,401)
Included in earnings	(5,795)	(1,464)
Unrealized gains included in other comprehensive income	0	0
Additions	0	0
Sales	0	0
Issuances	0	0
Settlements	1,442	1,450
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance, December 31,	(5,768)	(1,415)
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	(5,795)	(1,464)
Investment Securities Available For Sale [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	1,745	1,645
Included in earnings	0	0
Unrealized gains included in other comprehensive income	51	100
Additions	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, December 31,	1,796	1,745
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	0	0
Private Equity Investments [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	27,148	27,367
Included in earnings	(1,026)	(219)
Unrealized gains included in other comprehensive income	0	0
Additions	0	0
Sales	0	0
Issuances	0	0
Settlements	(629)	0
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance, December 31,	25,493	27,148
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	$ (1,026)	$ (219)

Fair Value Accounting (Assets A

Fair Value Accounting (Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 249,496	$ 301,800
Other real estate	22,308	47,030
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held for sale		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held for sale		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held for sale		425
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	6,613	4,144
Other loans held for sale		31
Other real estate	1,223	4,927
Other assets held for sale	5,715	1,323
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other loans held for sale		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]
Impaired loans	0	0
Other loans held for sale		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]
Impaired loans	21,742	15,708
Other loans held for sale		471
Other real estate	19,305	48,166
Other assets held for sale	$ 12,083	$ 4,747

Fair Value Accounting (Fair Val

Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	4.42%	4.77%
Fair Value, Measurements, Recurring [Member] | Private Equity Investments [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount of lack of liquidity	15.00%	15.00%
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Potential additional payments based on earnings, period	3 years
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Potential additional payments based on earnings, period	5 years
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated timing of resolution of covered litigation	1 year
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated timing of resolution of covered litigation	5 years
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Trust Preferred Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value disclosure	$ 1,796	$ 1,745
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Private Equity Investments [Member] | Individual Analysis of Each Investee Company [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value disclosure	25,493	27,148
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Liabilities [Member] | Internal Valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value disclosure	14,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Visa Derivative [Member] | Internal Valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value disclosure	$ 5,768	$ 1,415
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%	0.00%
Estimated selling costs	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	52.00%	80.00%
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	25.00%	29.00%
Estimated selling costs	7.00%	7.00%
Fair Value, Measurements, Nonrecurring [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, Nonrecurring [Member] | Other Loans Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		3.00%
Estimated selling costs		10.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Loans Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		3.00%
Estimated selling costs		7.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%	0.00%
Estimated selling costs	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	10.00%	20.00%
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	5.00%	7.00%
Estimated selling costs	7.00%	7.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%	0.00%
Estimated selling costs	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	81.00%	35.00%
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	47.00%	31.00%
Estimated selling costs	7.00%	7.00%

Fair Value Accounting (Carrying

Fair Value Accounting (Carrying And Estimated Fair Values Of Financial Instruments Carried On Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 395,175	$ 367,092
Interest bearing funds with Federal Reserve Bank	527,090	829,887
Interest earning deposits with banks	18,720	17,387
Federal funds sold and securities purchased under resale agreements	58,060	69,819
Trading account assets	9,314	5,097
Mortgage loans held for sale	51,545	59,275
Investment securities available for sale	3,718,195	3,587,818
Private equity investments	25,493	28,018
Loans, net of deferred fees and costs	23,604,633	22,177,069
Derivative assets	20,623	27,139
Non-interest bearing deposits	7,085,804	6,732,970
Interest bearing deposits	17,562,256	16,509,691
Federal funds purchased, other short-term borrowings and other short-term liabilities	159,699	177,025	$ 126,916
Long-term debt	2,160,881	2,186,893
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	395,175	367,092
Interest bearing funds with Federal Reserve Bank	527,090	829,887
Interest earning deposits with banks	18,720	17,387
Federal funds sold and securities purchased under resale agreements	58,060	69,819
Trading account assets	1,890	0
Mortgage loans held for sale	0	0
Other loans held for sale		0
Investment securities available for sale	114,676	56,102
Private equity investments	0	0
Mutual funds held in rabbi trusts	11,479	10,664
Loans, net of deferred fees and costs	0	0
Derivative assets	0	0
Trading account liabilities		0
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Federal funds purchased, other short-term borrowings and other short-term liabilities	159,699	177,025
Long-term debt	0	0
Other liabilities	0
Derivative liabilities	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	7,424	5,097
Mortgage loans held for sale	51,545	59,275
Other loans held for sale		0
Investment securities available for sale	3,601,723	3,529,971
Private equity investments	0	870
Mutual funds held in rabbi trusts	0	0
Loans, net of deferred fees and costs	0	0
Derivative assets	20,623	27,139
Trading account liabilities		1,032
Non-interest bearing deposits	7,085,804	6,732,970
Interest bearing deposits	17,560,021	16,516,222
Federal funds purchased, other short-term borrowings and other short-term liabilities	0	0
Long-term debt	2,217,544	2,244,376
Other liabilities	0
Derivative liabilities	17,531	26,030
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		425
Investment securities available for sale	1,796	1,745
Private equity investments	25,493	27,148
Mutual funds held in rabbi trusts	0	0
Loans, net of deferred fees and costs	23,709,434	22,192,903
Derivative assets	0	0
Trading account liabilities		0
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Federal funds purchased, other short-term borrowings and other short-term liabilities	0	0
Long-term debt	0	0
Other liabilities	14,000
Derivative liabilities	5,768	1,415
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	395,175	367,092
Interest bearing funds with Federal Reserve Bank	527,090	829,887
Interest earning deposits with banks	18,720	17,387
Federal funds sold and securities purchased under resale agreements	58,060	69,819
Trading account assets	9,314	5,097
Mortgage loans held for sale	51,545	59,275
Other loans held for sale		425
Investment securities available for sale	3,718,195	3,587,818
Private equity investments	25,493	28,018
Mutual funds held in rabbi trusts	11,479	10,664
Loans, net of deferred fees and costs	23,856,391	22,429,565
Derivative assets	20,623	27,139
Trading account liabilities		1,032
Non-interest bearing deposits	7,085,804	6,732,970
Interest bearing deposits	17,562,256	16,509,691
Federal funds purchased, other short-term borrowings and other short-term liabilities	159,699	177,025
Long-term debt	2,160,881	2,186,893
Other liabilities	14,000
Derivative liabilities	23,299	27,445
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	395,175	367,092
Interest bearing funds with Federal Reserve Bank	527,090	829,887
Interest earning deposits with banks	18,720	17,387
Federal funds sold and securities purchased under resale agreements	58,060	69,819
Trading account assets	9,314	5,097
Mortgage loans held for sale	51,545	59,275
Other loans held for sale		425
Investment securities available for sale	3,718,195	3,587,818
Private equity investments	25,493	28,018
Mutual funds held in rabbi trusts	11,479	10,664
Loans, net of deferred fees and costs	23,709,434	22,192,903
Derivative assets	20,623	27,139
Trading account liabilities		1,032
Non-interest bearing deposits	7,085,804	6,732,970
Interest bearing deposits	17,560,021	16,516,222
Federal funds purchased, other short-term borrowings and other short-term liabilities	159,699	177,025
Long-term debt	2,217,544	2,244,376
Other liabilities	14,000
Derivative liabilities	$ 23,299	$ 27,445

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Remaining unamortized deferred gain (loss) balance of all previously terminated cash flow hedges	$ (130)	$ (597)
Loss on early extinguishment of debt, net	4,735	1,533	$ 0
Remaining deferred (gain) loss balance on all previously terminated fair value hedges	873	4,000
Deferred gain balance on terminated fair value hedges expected to be reclassified from long-term debt	873
Deferred gain balance on terminated fair value hedges expected to be reclassified from loss on extinguishment of debt	1,300
Collateral pledge to collateralize derivative liabilities	56,100
Deferred gains of hedges reclassified into earnings	1,800	3,100	$ 3,100
Deferred gains of hedges reclassified into loss on extinguishment of debt	1,300	495
Fixed Rate Residential Mortgage [Member]
Derivative [Line Items]
Commitments to fund fixed-rate mortgage loans	88,200	88,800
Unrealized gain on fair value of fixed-rate mortgage loans to customers	182	175
Sale of outstanding commitments	126,500	95,000
Unrealized gain (loss) on mortgage loans	1,700	924
Visa USA [Member]
Derivative [Line Items]
Derivative, fair value	5,800	1,400
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount of interest rate swap contracts	1,320,000	$ 49,200
Cash Flow Hedging [Member]
Derivative [Line Items]
Loss on early extinguishment of debt, net	196
Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative [Line Items]
Loss on early extinguishment of debt, net	$ 130

Derivative Instruments (Impact

Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Assets [Member]
Derivative [Line Items]
Fair Value of Derivative Assets	$ 20,623	$ 27,139
Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair Value of Derivative Assets	17,157	25,580
Other Assets [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair Value of Derivative Assets	3,466	1,559
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	23,299	27,445
Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair Value of Derivative Liabilities	17,531	26,030
Other Liabilities [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair Value of Derivative Liabilities	0	0
Other Liabilities [Member] | Visa Derivative [Member]
Derivative [Line Items]
Fair Value of Derivative Liabilities	$ 5,768	$ 1,415

Derivative Instruments (Effect

Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 1,983	$ 1,143	$ (602)
Interest Rate Contracts [Member] | Other Non-Interest Income [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	76	44	460
Mortgage Derivatives [Member] | Mortgage Banking Income [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 1,907	$ 1,099	$ (1,062)

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Rabbi Trusts [Member]
Variable Interest Entity [Line Items]
Carrying value of VIE assets and liabilities, net	$ 11,500	$ 10,700
Low Income Housing Tax Credit Partnerships [Member]
Variable Interest Entity [Line Items]
Carrying value of VIE assets and liabilities, net	26,500	18,900
Equity method investments	34,100	29,300
Commitments to fund equity investments	$ 17,400	12,200
Historic Rehabilitation Partnerships [Member]
Variable Interest Entity [Line Items]
Carrying value of VIE assets and liabilities, net		$ 350

Visa Shares and Litigation E108

Visa Shares and Litigation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Indemnification charge to earnings	$ 5.8	$ 1.5	$ 3
Visa Class B to Visa Class A Shares Conversion Rate [Member]
Derivative [Line Items]
Fair value of derivative liability	$ 5.8	$ 1.4

Commitments and Contingencie109

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Contractual amount net of risk participations	$ 83,000
Accrued liabilities related to mortgage repurchase claims	2,300	$ 3,200
Guarantee Obligations [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	8,845,199
Letters of Credit [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	150,948
Commitments to Fund Commercial Real Estate, Construction, and Land Development Loans [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	1,394,162
Unused Credit Card Lines [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	1,103,431
Commitments under Home Equity Lines of Credit [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	1,096,052
Commitments to Fund Commercial and Industrial Loans [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	4,792,834
Other Loan Commitments [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	$ 307,772

Legal Proceedings (Details)

Legal Proceedings (Details)	Dec. 31, 2016USD ($)
Minimum [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	$ 0
Maximum [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	$ 12,000,000

Employment Expenses and Bene111

Employment Expenses and Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employer matching contribution, percent	100.00%
401(k) percent of match	4.00%
Annual contribution	$ 10,800	$ 9,900	$ 9,400
Stock purchase plan, percent of match	15.00%
Stock purchase plans compensation expense	$ 826	$ 835	$ 880

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)simulation$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Apr. 25, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 13,600	$ 12,600	$ 10,200
Tax benefit recognized from compensation expense	5,000	4,600	3,900
Unrecognized compensation cost	15,000
Options outstanding, aggregate intrinsic value	$ 23,200
Options outstanding, weighted average remaining contractual term (years)	5 years 2 months 16 days
Options exercised, intrinsic value	$ 4,700	4,400	1,300
Cash received from option exercises	5,155	5,643	3,048
Total grant date fair value of stock options vested	$ 7,400	$ 6,500	$ 4,900
Options expired/canceled (in shares) | shares	469,792	456,438	462,583
Options expired (in dollars per share) | $ / shares	$ 92.62	$ 94.56	$ 84.88
Share-based compensation, excess tax expense, amount	$ 1,700
Share-based compensation tax benefit (deficiency)	$ (790)	$ 1,656	$ (3,168)
Contractual Expiration Dates in 2017 and 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expired/canceled (in shares) | shares	317,524
Options expired (in dollars per share) | $ / shares	$ 93.62
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from option exercises	$ 5,200	$ 5,600	$ 3,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Non-option awards granted (in shares) | shares	350,458	321,874	407,374
Non-option awards granted, weighted-average grant-date fair value (in dollars per share) | $ / shares	$ 26.43	$ 28.09	$ 23.69
Unrecognized compensation cost	$ 9,700
Non-option awards vested, total fair value	11,400	$ 12,300	$ 1,600
Taxes paid for vesting of employee share units	$ 5,000	$ 5,100	$ 692
Unrecognized compensation cost, period of recognition (years)	1 year 5 months 1 day
Market Restricted Stock Units (MRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Non-option awards granted (in shares) | shares	93,913	82,152	90,117
Non-option awards granted, weighted-average grant-date fair value (in dollars per share) | $ / shares	$ 26.93	$ 29.39	$ 24.30
Unrecognized compensation cost	$ 2,800
Number of simulations | simulation	100,000
Non-option awards vested, total fair value	$ 2,600	$ 1,400	$ 398
Unrecognized compensation cost, period of recognition (years)	1 year 5 months 23 days
Performance Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-option awards granted (in shares) | shares	83,529	82,152	67,157
Non-option awards granted, weighted-average grant-date fair value (in dollars per share) | $ / shares	$ 25.95	$ 28.06	$ 23.47
Unrecognized compensation cost	$ 2,400
Unrecognized compensation cost, period of recognition (years)	1 year 4 months 28 days
Salary Stock Units (SSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-option awards granted (in shares) | shares			44,527
Units granted, fair value			$ 1,200
Minimum [Member] | Market Restricted Stock Units (MRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting range based on return on average assets (ROAA)	75.00%
Minimum [Member] | Performance Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vested and expected to vest, range based on return on average assets	0.00%
Maximum [Member] | Market Restricted Stock Units (MRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting range based on return on average assets (ROAA)	125.00%
Maximum [Member] | Performance Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vested and expected to vest, range based on return on average assets	150.00%
2013 Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of authorized but unissued common stock reserved for future grants (in shares) | shares	6,432,798			8,571,429
2013 Omnibus Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2013 Omnibus Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Contractual terms	10 years

Stock-Based Compensation (Stock

Stock-Based Compensation (Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares
Outstanding at beginning of year (in shares)	1,741,975	2,550,046	3,220,110
Option rounding due to reverse stock split on May 16, 2014 (in shares)	0	0	841
Options exercised (in shares)	(297,225)	(338,808)	(178,176)
Options forfeited (in shares)	(1,597)	(12,825)	(30,146)
Options expired/canceled (in shares)	(469,792)	(456,438)	(462,583)
Options outstanding at end of year (in shares)	973,361	1,741,975	2,550,046
Options exercisable at end of year (in shares)		1,504,783	1,870,516
Weighted-Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 37.88	$ 45.11	$ 49
Option rounding due to reverse stock split on May 16, 2014 (in dollars per share)	0	0	49
Options exercised (in dollars per share)	17.35	16.72	17.14
Options forfeited (in dollars per share)	17.64	17.17	15.79
Options expired (in dollars per share)	92.62	94.56	84.88
Options outstanding at end of year (in dollars per share)	17.76	37.88	45.11
Options exercisable at end of year (in dollars per share)	$ 17.76	$ 41.08	$ 55.40

Share-Based Compensation (Fair

Share-Based Compensation (Fair Value Assumptions) (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.81%	1.05%	0.70%
Expected stock price volatility	25.70%	26.40%	39.20%
Dividend yield	1.80%	1.40%	1.20%
Simulation period	3 years	3 years	3 years

Share-Based Compensation (Restr

Share-Based Compensation (Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Units
Outstanding, Beginning of Period (in shares)	762,767	882,823	581,677
Share unit rounding due to reverse stock split on May 16, 2014 (in shares)			258
Granted (in shares)	350,458	321,874	407,374
Dividend equivalents granted (in shares)	11,105	9,810	8,805
Vested (in shares)	(406,496)	(428,121)	(64,725)
Forfeited (in shares)	(12,067)	(23,619)	(50,566)
Outstanding, End of Period (in shares)	705,767	762,767	882,823
Weighted-Average grant date Fair Value
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share)	$ 24.57	$ 19.81	$ 16.38
Share unit rounding due to reverse stock split on May 16, 2014, Weighted-Average Grant-date Fair Value (in dollars per share)			16.38
Granted, Weighted-Average Grant-date Fair Value (in dollars per share)	26.43	28.09	23.69
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share)	26.43	28.09	24.09
Vested, Weighted-Average Grant-date Fair Value (in dollars per share)	23.10	17.48	15.45
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share)	23.96	24.60	17.92
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share)	$ 26.38	$ 24.57	$ 19.81

Share-Based Compensation (Marke

Share-Based Compensation (Market Restricted Share Units and Performance Share Units) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Market Restricted Stock Units (MRSUs) [Member]
Share Units
Outstanding, Beginning of Period (in shares)	158,248	118,186	40,512
Share unit rounding due to reverse stock split on May 16, 2014 (in shares)			4
Granted (in shares)	93,913	82,152	90,117
Dividend equivalents granted (in shares)	3,095	2,221	1,231
Quantity change by TSR factor (in shares)	9,970	4,838	1,518
Vested (in shares)	(82,817)	(49,149)	(15,196)
Outstanding, End of Period (in shares)	182,409	158,248	118,186
Weighted-Average grant date Fair Value
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share)	$ 27.02	$ 24.33	$ 24.43
Share unit rounding due to reverse stock split on May 16, 2014, Weighted-Average Grant-date Fair Value (in dollars per share)			24.43
Granted, Weighted-Average Grant-date Fair Value (in dollars per share)	26.93	29.39	24.30
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share)	26.93	29.05	24.09
Quantity change by TSR factor, Weighted-Average Grant-date Fair Value (in dollars per share)	26.93	24.33	24.43
Vested, Weighted-Average Grant-date Fair Value (in dollars per share)	26.40	24.34	24.43
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share)	$ 27.25	$ 27.02	$ 24.33
Performance Share Units (PSUs) [Member]
Share Units
Outstanding, Beginning of Period (in shares)	151,567	67,675	0
Granted (in shares)	83,529	82,152	67,157
Dividend equivalents granted (in shares)	3,384	1,740	518
Outstanding, End of Period (in shares)	238,480	151,567	67,675
Weighted-Average grant date Fair Value
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share)	$ 26.01	$ 23.47	$ 0
Granted, Weighted-Average Grant-date Fair Value (in dollars per share)	25.95	28.06	23.47
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share)	25.95	28.06	24.09
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share)	$ 25.99	$ 26.01	$ 23.47

Share-Based Compensation (Grant

Share-Based Compensation (Grants Under All Synovus Equity Compensation Plan) (Details) - Shareholder Approved Equity Compensation Plans for Shares of Synovus Stock [Member]	Dec. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon vesting of restricted share units (in shares)	1,126,656
Number of securities to be issued upon exercise of outstanding options (in shares)	973,361
Weighted-average exercise price of outstanding options (in dollars per share) | $ / shares	$ 17.76
Number of shares remaining available for issuance excluding shares discussed (in shares)	6,432,798

Income Taxes (Components of Inc

Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal									$ 7,329	$ 6,163	$ 5,140
State									5,501	4,424	150
Total current income tax expense									12,830	10,587	5,290
Deferred
Federal									117,463	108,877	92,360
State									11,374	13,027	9,660
Total deferred income tax expense									128,837	121,904	102,020
Total income tax expense	$ 39,519	$ 37,375	$ 33,574	$ 31,199	$ 32,342	$ 36,058	$ 32,242	$ 31,849	141,667	132,491	107,310
Share-based compensation tax benefit (deficiency)									$ (790)	$ 1,656	$ (3,168)

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
U.S. federal income tax rate									35.00%
Income Tax Expense (Benefit) Reconciliation
Income tax expense at statutory federal income tax rate									$ 135,957	$ 125,501	$ 105,896
State income tax expense, net of federal income tax benefit									13,256	12,870	8,014
Bank-owned life insurance									(3,402)	(2,885)	(2,928)
Change in valuation allowance									(2,055)	(589)	(2,273)
General business tax credits									(1,213)	(1,173)	(1,123)
Tax-exempt income									(825)	(835)	(1,076)
Other, net									(51)	(398)	800
Total income tax expense	$ 39,519	$ 37,375	$ 33,574	$ 31,199	$ 32,342	$ 36,058	$ 32,242	$ 31,849	$ 141,667	$ 132,491	$ 107,310
Effective tax rate									36.50%	36.90%	35.50%

Income Taxes (Deferred Tax Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax assets
Net operating loss carryforwards	$ 167,072	$ 308,617
Allowance for loan losses	100,419	103,884
Tax credit carryforwards	67,031	59,434
Employee benefits and deferred compensation	21,024	21,177
Net unrealized losses on investment securities available for sale	19,413	3,072
Non-performing loan interest	19,137	16,604
Deferred revenue	18,639	16,529
Other	19,759	18,573
Total gross deferred tax assets	432,494	547,890
Less valuation allowance	(9,658)	(11,713)
Total deferred tax assets	422,836	536,177
Deferred tax liabilities
Fixed assets held for sale	(8,179)	(5,985)
Purchase accounting adjustments	(5,765)	(811)
Excess tax over financial statement depreciation	(5,343)	(8,564)
Ownership interest in partnerships	(5,242)	(4,537)
Other	(2,951)	(4,332)
Total gross deferred tax liabilities	(27,480)	(24,229)
Net deferred tax asset	$ 395,356	$ 511,948

Income Taxes (Tax Carryforwards

Income Taxes (Tax Carryforwards) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	$ 432,494	$ 547,890
Deferred Tax Assets, Valuation Allowance	(9,658)	(11,713)
Total deferred tax assets	422,836	$ 536,177
Federal [Member] | Net Operating Loss [Member] | 2031-2036 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	126,351
Deferred Tax Assets, Valuation Allowance	0
Total deferred tax assets	126,351
Pre-Tax Earnings Necessary to Realize	361,004
Federal [Member] | General Business Tax Credits [Member] | 2028-2036 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	8,383
Deferred Tax Assets, Valuation Allowance	0
Total deferred tax assets	8,383
Federal [Member] | Alternative Minimum Tax Credit [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	43,037
Deferred Tax Assets, Valuation Allowance	0
Total deferred tax assets	43,037
State [Member] | Net Operating Loss [Member] | 2025-2029 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	13,244
Deferred Tax Assets, Valuation Allowance	0
Total deferred tax assets	13,244
Pre-Tax Earnings Necessary to Realize	1,370,624
State [Member] | Net Operating Loss [Member] | 2030-2036 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	36,148
Deferred Tax Assets, Valuation Allowance	0
Total deferred tax assets	36,148
Pre-Tax Earnings Necessary to Realize	1,165,627
State [Member] | Net Operating Loss [Member] | 2030-2036 [Member] | Global One [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	3,000
State [Member] | Other Credits [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	950
Deferred Tax Assets, Valuation Allowance	0
Total deferred tax assets	950
State [Member] | Other Credits [Member] | 2017-2020 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	12,422
Deferred Tax Assets, Valuation Allowance	(9,658)
Total deferred tax assets	2,764
State [Member] | Other Credits [Member] | 2021-2026 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Gross	2,239
Deferred Tax Assets, Valuation Allowance	0
Total deferred tax assets	$ 2,239

Income Taxes (Unrecognized Tax

Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Income Tax Benefits
Balance at January 1,	$ 12,745	$ 13,023	$ 912
Additions based on income tax positions related to current year	0	0	0
Additions for income tax positions of prior years	1,811	8	12,318
Additions from acquisition	608	0	0
Deductions for income tax positions of prior years	0	0	(52)
Statute of limitation expirations	(419)	(286)	(155)
Settlements	0	0	0
Balance at December 31,	$ 14,745	$ 12,745	$ 13,023

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 01, 2016
Income Tax Contingency [Line Items]
Deferred tax liabilities	$ 27,480	$ 24,229
Valuation allowance recorded during the period	2,055	589	$ 2,273
Deferred tax assets expected to be realized	395,400
Valuation allowance	9,658	11,713
Deferred tax assets, not subject to expiration	213,900
Unrecognized tax benefits, income tax penalties and interest accrued	38	96	109
Unrecognized tax benefits that would impact effective tax rate	9,900	8,300	$ 8,500
Unrecognized tax benefits, income tax penalties and interest accrued that would impact effective tax rate	25	$ 63
Approximate range of uncertain income tax positions expected to be settled or resolved during the next 12 months, minimum	80
Period through 2019 [Member]
Income Tax Contingency [Line Items]
Valuation allowance	9,700
Period from 2030 through 2032 [Member]
Income Tax Contingency [Line Items]
Deferred tax assets, subject to expiration	126,400
Period through 2035 [Member]
Income Tax Contingency [Line Items]
Deferred tax assets, subject to expiration	40,700
Federal [Member]
Income Tax Contingency [Line Items]
Alternative minimum tax credits	43,000
Federal and State [Member] | Period through 2035 [Member]
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	$ 24,000
Global One [Member]
Income Tax Contingency [Line Items]
Deferred tax liabilities				$ 3,100

Condensed Financial Informat124

Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Cash due from bank subsidiary	$ 395,175	$ 367,092
Other assets	813,220	650,174
Total assets	30,104,002	28,792,653
Liabilities and Shareholders' Equity
Long-term debt	2,160,881	2,186,893
Other liabilities	207,438	185,878
Total liabilities	27,176,078	25,792,457
Shareholders’ equity:
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at December 31, 2016 and December 31, 2015	125,980	125,980
Common stock	142,026	140,592
Additional paid-in capital	3,028,405	2,989,981
Treasury stock	(664,595)	(401,511)
Accumulated other comprehensive loss, net	(55,659)	(29,819)
Retained earnings	351,767	174,973
Total shareholders’ equity	2,927,924	3,000,196
Total liabilities and shareholders' equity	30,104,002	28,792,653
Parent Company [Member]
Assets [Abstract]
Cash due from bank subsidiary	234,339	369,564
Funds due from other depository institutions	19,911	19,911
Investment in consolidated bank subsidiary, at equity	3,319,980	3,339,233
Investment in consolidated nonbank subsidiaries, at equity	71,335	71,350
Notes receivable from nonbank subsidiaries	35,200	67,000
Other assets	101,346	105,513
Total assets	3,782,111	3,972,571
Liabilities and Shareholders' Equity
Long-term debt	834,252	960,185
Other liabilities	19,935	12,190
Total liabilities	854,187	972,375
Shareholders’ equity:
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at December 31, 2016 and December 31, 2015	125,980	125,980
Common stock	142,026	140,592
Additional paid-in capital	3,028,405	2,989,981
Treasury stock	(664,595)	(401,511)
Accumulated other comprehensive loss, net	(55,659)	(29,819)
Retained earnings	351,767	174,973
Total shareholders’ equity	2,927,924	3,000,196
Total liabilities and shareholders' equity	$ 3,782,111	$ 3,972,571

Condensed Financial Informat125

Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Expenses
Interest expense									$ 123,623	$ 118,644	$ 109,408
Other expenses									755,923	717,655	744,998
Income before income taxes	$ 108,068	$ 102,620	$ 94,031	$ 83,730	$ 90,741	$ 93,986	$ 88,034	$ 85,812	388,451	358,573	302,559
Dividends on preferred stock									10,238	10,238	10,238
Net income available to common shareholders	$ 65,990	$ 62,686	$ 57,898	$ 49,972	$ 55,839	$ 55,369	$ 53,233	$ 51,404	236,546	215,844	185,011
Parent Company [Member]
Income
Cash dividends received from Synovus Bank									325,000	199,904	90,626
Cash distributions received from Synovus Bank									0	25,096	91,374
Interest income									2,565	8,865	14,262
Other income									4,595	(337)	(932)
Total income									332,160	233,528	195,330
Expenses
Interest expense									52,831	46,585	45,726
Other expenses									20,652	10,516	10,337
Total expenses									73,483	57,101	56,063
Income before income taxes									258,677	176,427	139,267
Allocated income tax benefit									(25,628)	(18,808)	(16,491)
Income before equity in undistributed income (loss) of subsidiaries									284,305	195,235	155,758
Equity in undistributed income (loss) of subsidiaries									(37,521)	30,847	39,491
Net income (loss) available to controlling interest									246,784	226,082	195,249
Dividends on preferred stock									10,238	10,238	10,238
Net income available to common shareholders									$ 236,546	$ 215,844	$ 185,011

Condensed Financial Informat126

Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net income, Before-tax Amount									$ 388,451	$ 358,573	$ 302,559
Net income, Tax (Expense) Benefit	$ (39,519)	$ (37,375)	$ (33,574)	$ (31,199)	$ (32,342)	$ (36,058)	$ (32,242)	$ (31,849)	(141,667)	(132,491)	(107,310)
Net income	$ 68,549	$ 65,245	$ 60,457	$ 52,531	$ 58,398	$ 57,928	$ 55,792	$ 53,963	246,784	226,082	195,249
Reclassification adjustment for losses realized in net income, Before-tax Amount									467	521	448
Reclassification adjustment for losses realized in net income, Tax (Expense) Benefit									(180)	(201)	(173)
Reclassification adjustment for losses realized in net income, Net of Tax Amount									287	320	275
Reclassification adjustment for net gains realized in net income on investment securities available for sale, Before-tax Amount									(6,011)	(2,769)	(1,331)
Reclassification adjustment for net gains realized in net income on investment securities available for sale, Tax (Expense) Benefit									2,314	1,066	513
Reclassification adjustment for net gains realized in net income on investment securities available for sale, Net of Tax Amount									(3,697)	(1,703)	(818)
Net unrealized (losses) gains arising during the period, Before-tax Amount									(36,432)	(25,707)	47,223
Net unrealized (losses) gains arising during the period, Tax (Expense) Benefit									14,027	9,901	(18,182)
Net unrealized (losses) gains arising during the period, Net of Tax Amount									(22,405)	(15,806)	29,041
Other comprehensive (loss) income, Before-tax Amount									(42,018)	(27,991)	46,591
Other comprehensive (loss) income, Tax (Expense) Benefit									16,178	10,777	(17,938)
Other comprehensive (loss) income, Net of Tax Amount									(25,840)	(17,214)	28,653
Comprehensive income, Net of Tax Amount									220,944	208,868	223,902
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income, Before-tax Amount									388,451	358,573	302,559
Net income, Tax (Expense) Benefit									(141,667)	(132,491)	(107,310)
Net income									246,784	226,082	195,249
Reclassification adjustment for losses realized in net income, Before-tax Amount									467	521	448
Reclassification adjustment for losses realized in net income, Tax (Expense) Benefit									(180)	(201)	(173)
Reclassification adjustment for losses realized in net income, Net of Tax Amount									287	320	275
Reclassification adjustment for net gains realized in net income on investment securities available for sale, Before-tax Amount									(5,763)	0	0
Reclassification adjustment for net gains realized in net income on investment securities available for sale, Tax (Expense) Benefit									2,219	0	0
Reclassification adjustment for net gains realized in net income on investment securities available for sale, Net of Tax Amount									(3,544)	0	0
Net unrealized (losses) gains arising during the period, Before-tax Amount									2,358	2,908	21
Net unrealized (losses) gains arising during the period, Tax (Expense) Benefit									(908)	(1,120)	(8)
Net unrealized (losses) gains arising during the period, Net of Tax Amount									1,450	1,788	13
Other comprehensive gain (loss) of bank subsidiary, Before-tax Amount									(39,080)	(31,420)	46,122
Other comprehensive gain (loss) of bank subsidiary, Tax (expense) Benefit									15,047	12,098	(17,757)
Other comprehensive gain (loss) of bank subsidiary, Net of Tax Amount									(24,033)	(19,322)	28,365
Other comprehensive (loss) income, Before-tax Amount									(42,018)	(27,991)	46,591
Other comprehensive (loss) income, Tax (Expense) Benefit									16,178	10,777	(17,938)
Other comprehensive (loss) income, Net of Tax Amount									(25,840)	(17,214)	28,653
Comprehensive income, Net of Tax Amount									$ 220,944	$ 208,868	$ 223,902

Condensed Financial Informat127

Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Adjustments to reconcile net income to net cash provided by operating activities:
Net cash provided by operating activities	$ 467,767	$ 447,542	$ 387,218
Investing Activities
Net cash used in investing activities	(1,105,595)	(2,109,273)	(1,166,774)
Financing Activities
Repurchases and agreements to repurchase shares of common stock	(263,084)	(199,221)	(88,113)
Repayments on long-term debt	(2,263,688)	(823,899)	(400,781)
Proceeds from issuance of long-term debt	1,875,000	871,644	510,000
Net cash provided by financing activities	665,911	1,543,334	795,415
Increase (decrease) in cash and cash equivalents	28,083	(118,397)	15,859
Cash and cash equivalents at beginning of year	367,092	485,489	469,630
Cash and cash equivalents at end of year	395,175	367,092	485,489
Income tax payments, net	9,340	10,514	5,971
Interest paid	123,560	115,795	109,549
Parent Company [Member]
Operating Activities
Net income	246,784	226,082	195,249
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed loss (income) of subsidiaries	37,521	(30,847)	(39,491)
Deferred income tax expense (benefit)	17,989	(2,506)	(5,041)
Net increase (decrease) in other liabilities	7,746	(1,709)	(22,323)
Net (increase) decrease in other assets	(9,214)	1,045	14,226
Other, net	(1,648)	(178)	(2,041)
Net cash provided by operating activities	299,178	191,887	140,579
Investing Activities
Net cash received (used) in acquisitions/dispositions	(3,408)	0	0
Net decrease in short-term notes receivable from non-bank subsidiaries	31,800	10,000	39,000
Net cash used in investing activities	28,392	10,000	39,000
Financing Activities
Dividends paid to common and preferred shareholders	(69,663)	(65,592)	(53,043)
Repurchases and agreements to repurchase shares of common stock	(263,084)	(199,221)	(88,113)
Repayments on long-term debt	(130,048)	(48,553)	0
Proceeds from issuance of long-term debt	0	246,644	0
Net cash provided by financing activities	(462,795)	(66,722)	(141,156)
Increase (decrease) in cash and cash equivalents	(135,225)	135,165	38,423
Cash and cash equivalents at beginning of year	389,475	254,310	215,887
Cash and cash equivalents at end of year	254,250	389,475	254,310
Income tax payments, net	9,500	8,700	4,800
Interest paid	$ 53,100	$ 46,900	$ 46,900

Supplemental Financial Data (De

Supplemental Financial Data (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Income Statement Elements [Abstract]
Litigation settlement/contingency expenses	$ 2,511	$ 5,110,000	$ 12,812,000
Insurance and bonds	$ 12,023	$ 12,514,000	$ 11,801,000

Summary of Quarterly Financi129

Summary of Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Interest income	$ 264,534	$ 256,554	$ 252,393	$ 249,323	$ 242,814	$ 238,093	$ 233,654	$ 231,401	$ 1,022,803	$ 945,962	$ 928,692
Net interest income	233,530	226,007	221,449	218,193	212,620	207,790	203,644	203,263	899,180	827,318	819,284
Provision for loan losses	6,259	5,671	6,693	9,377	5,021	2,956	6,636	4,397	28,000	19,010	33,831
Income before income taxes	108,068	102,620	94,031	83,730	90,741	93,986	88,034	85,812	388,451	358,573	302,559
Income tax expense	39,519	37,375	33,574	31,199	32,342	36,058	32,242	31,849	141,667	132,491	107,310
Net income	68,549	65,245	60,457	52,531	58,398	57,928	55,792	53,963	246,784	226,082	195,249
Net income available common shareholders	$ 65,990	$ 62,686	$ 57,898	$ 49,972	$ 55,839	$ 55,369	$ 53,233	$ 51,404	$ 236,546	$ 215,844	$ 185,011
Net income per common share, basic (per share)	$ 0.54	$ 0.51	$ 0.46	$ 0.39	$ 0.43	$ 0.42	$ 0.40	$ 0.38	$ 1.90	$ 1.63	$ 1.34
Net income per common share, diluted (per share)	$ 0.54	$ 0.51	$ 0.46	$ 0.39	$ 0.43	$ 0.42	$ 0.40	$ 0.38	$ 1.89	$ 1.62	$ 1.33
Allowance for loan losses and provision for loan losses	$ 12,900								$ 13,300