Synovus Financial (SNV) 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
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
Entity Common Stock, Shares Outstanding		121,501,638

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 377,213	$ 395,175
Interest bearing funds with Federal Reserve Bank	468,148	527,090
Interest earning deposits with banks	6,012	18,720
Federal funds sold and securities purchased under resale agreements	46,847	58,060
Trading account assets, at fair value	3,045	9,314
Mortgage loans held for sale, at fair value	61,893	51,545
Investment securities available for sale, at fair value	3,827,058	3,718,195
Loans, net of deferred fees and costs	24,430,512	23,856,391
Allowance for loan losses	(248,095)	(251,758)
Loans, net	24,182,417	23,604,633
Premises and equipment, net	416,364	417,485
Goodwill	57,092	59,678
Other intangible assets	11,843	13,223
Other real estate	19,476	22,308
Deferred tax asset, net	320,403	395,356
Other assets	890,155	813,220
Total assets	30,687,966	30,104,002
Deposits:
Non-interest bearing deposits	7,363,476	7,085,804
Interest bearing deposits, excluding brokered deposits	16,387,032	16,183,273
Brokered deposits	1,468,308	1,378,983
Total deposits	25,218,816	24,648,060
Federal funds purchased and securities sold under repurchase agreements	150,379	159,699
Long-term debt	2,107,245	2,160,881
Other liabilities	213,579	207,438
Total liabilities	27,690,019	27,176,078
Shareholders' Equity
Series C Preferred Stock – no par value. Authorized 100,000,000 shares; 5,200,000 shares issued and outstanding at June 30, 2017 and December 31, 2016	125,980	125,980
Common stock - $1.00 par value. Authorized 342,857,143 shares; 142,498,906 issued at June 30, 2017 and 142,025,720 issued at December 31, 2016; 121,661,092 outstanding at June 30, 2017 and 122,266,106 outstanding at December 31, 2016	142,499	142,026
Additional paid-in capital	3,029,754	3,028,405
Treasury stock, at cost – 20,837,814 shares at June 30, 2017 and 19,759,614 shares at December 31, 2016	(709,944)	(664,595)
Accumulated other comprehensive loss	(47,865)	(55,659)
Retained earnings	457,523	351,767
Total shareholders’ equity	2,997,947	2,927,924
Total liabilities and shareholders' equity	$ 30,687,966	$ 30,104,002

Consolidated Balance Sheets (u3

Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred Stock, shares authorized	100,000,000	100,000,000
Preferred Stock, shares issued	5,200,000	5,200,000
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	142,498,906	142,025,720
Common stock, shares outstanding	121,661,092	122,266,106
Treasury stock, shares at cost	20,837,814	19,759,614

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Loans, including fees	$ 261,971	$ 232,974	$ 511,319	$ 462,892
Investment securities available for sale	20,266	16,685	40,099	33,655
Trading account assets	21	12	49	34
Mortgage loans held for sale	505	650	972	1,238
Federal Reserve Bank balances	1,304	1,020	2,515	2,019
Other earning assets	1,443	1,052	2,957	1,878
Total interest income	285,510	252,393	557,911	501,716
Interest expense:
Deposits	18,118	16,200	35,075	32,214
Federal funds purchased and securities sold under repurchase agreements	45	51	84	96
Long-term debt	16,250	14,693	31,728	29,763
Total interest expense	34,413	30,944	66,887	62,073
Net interest income	251,097	221,449	491,024	439,643
Provision for loan losses	10,260	6,693	18,934	16,070
Net interest income after provision for loan losses	240,837	214,756	472,090	423,573
Non-interest income:
Service charges on deposit accounts	19,820	20,240	39,593	39,950
Fiduciary and asset management fees	12,524	11,580	24,676	22,854
Brokerage revenue	7,210	7,338	14,436	13,821
Mortgage banking income	5,784	5,941	11,548	11,425
Bankcard fees	8,253	8,346	16,438	16,718
Investment securities gains (losses), net	(1)	0	7,667	67
(Decrease) increase in fair value of private equity investments, net	(1,352)	113	(3,166)	(278)
Other fee income	6,164	5,280	11,033	10,084
Other non-interest income	10,299	9,048	18,314	16,392
Total non-interest income	68,701	67,886	140,539	131,033
Non-interest expense:
Salaries and other personnel expense	105,213	97,061	212,404	198,419
Net occupancy and equipment expense	29,933	26,783	59,264	53,360
Third-party processing expense	13,620	11,698	26,223	22,814
FDIC insurance and other regulatory fees	6,875	6,625	13,645	13,344
Professional fees	7,551	6,938	12,907	13,307
Advertising expense	5,346	7,351	11,258	9,761
Foreclosed real estate expense, net	1,448	4,588	3,582	7,272
Earnout liability adjustment	1,707	0	1,707	0
Merger-related expense	0	0	86	0
Loss on early extinguishment of debt, net	0	0	0	4,735
Fair value adjustment to Visa derivative	0	360	0	720
Restructuring charges, net	13	5,841	6,524	6,981
Other operating expenses	20,041	21,366	41,533	46,131
Total non-interest expense	191,747	188,611	389,133	376,844
Income before income taxes	117,791	94,031	223,496	177,762
Income tax expense	41,788	33,574	75,635	64,773
Net income	76,003	60,457	147,861	112,989
Dividends on preferred stock	2,559	2,559	5,119	5,119
Net income available to common shareholders	$ 73,444	$ 57,898	$ 142,742	$ 107,870
Net income per common share, basic (in dollars per share)	$ 0.60	$ 0.46	$ 1.17	$ 0.85
Net income per common share, diluted (in dollars per share)	$ 0.60	$ 0.46	$ 1.16	$ 0.85
Weighted average common shares outstanding, basic (in shares)	122,203	125,100	122,251	126,164
Weighted average common shares outstanding, diluted (in shares)	123,027	125,699	123,043	126,778

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income, Before-tax Amount	$ 117,791	$ 94,031	$ 223,496	$ 177,762
Net income, Tax (Expense) Benefit	(41,788)	(33,574)	(75,635)	(64,773)
Net income	76,003	60,457	147,861	112,989
Reclassification adjustment for losses realized in net income, Before-tax Amount	65	64	130	337
Reclassification adjustment for losses realized in net income, Tax (Expense) Benefit	(25)	(25)	(50)	(130)
Reclassification adjustment for losses realized in net income, Net of Tax Amount	40	39	80	207
Net unrealized gains on investment securities available for sale:
Reclassification adjustment for net (gains) losses realized in net income, Before-tax Amount	1	0	(7,667)	(67)
Net unrealized gains arising during the period, Before-tax Amount	11,150	19,044	20,250	66,215
Net unrealized gain, Before-tax Amount	11,151	19,044	12,583	66,148
Net unrealized gains on investment securities available for sale: Tax (Expense) Benefit
Reclassification adjustment for net (gains) losses realized in net income, Tax (Expense) Benefit	0	0	2,952	26
Net unrealized gains arising during the period, Tax (Expense) Benefit	(4,293)	(7,332)	(7,797)	(25,493)
Net unrealized gains, Tax (Expense) Benefit	(4,293)	(7,332)	(4,845)	(25,467)
Net unrealized gains on investment securities available for sale: Net of Tax Amount
Reclassification adjustment for net (gains) losses realized in net income, Net of Tax Amount	1	0	(4,715)	(41)
Net unrealized gains arising during the period, Net of Tax Amount	6,857	11,712	12,453	40,722
Net unrealized gains, Net of Tax Amount	6,858	11,712	7,738	40,681
Post-retirement unfunded health benefit: Before-tax Amount
Reclassification adjustment for gains realized in net income, Before-tax Amount	(20)	(10)	(40)	(104)
Actuarial gains arising during the period, Before-tax Amount	0	0	0	0
Net unrealized (realized) gains, Before-tax Amount	(20)	(10)	(40)	(104)
Post-retirement unfunded health benefit: Tax (Expense) Benefit
Reclassification adjustment for gains realized in net income, Tax (Expense) Benefit	8	4	16	40
Actuarial gains arising during the period, Tax (Expense) Benefit	0	0	0	0
Net unrealized (realized) gains, Tax (Expense) Benefit	8	4	16	40
Post-retirement unfunded health benefit: Net of Tax Amount
Reclassification adjustment for gains realized in net income, Net of Tax Amount	(12)	(6)	(24)	(64)
Actuarial gains arising during the period, Net of Tax Amount	0	0	0	0
Net unrealized (realized) gains, Net of Tax Amount	(12)	(6)	(24)	(64)
Other comprehensive income, Before-tax Amount	11,196	19,098	12,673	66,381
Other comprehensive income, Tax (Expense) Benefit	(4,310)	(7,353)	(4,879)	(25,557)
Other comprehensive income, Net of Tax Amount	6,886	11,745	7,794	40,824
Comprehensive income, Net of Tax Amount	$ 82,889	$ 72,202	$ 155,655	$ 153,813

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Preferred StockSeries C Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
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	112,989						112,989
Other comprehensive income, net of income taxes	40,824					40,824
Cash dividends declared on common stock	(30,015)						(30,015)
Cash dividends paid on Series C Preferred Stock	(5,119)						(5,119)
Repurchases of common stock	(171,547)				(171,547)
Restricted share unit activity	(4,605)		298	(4,814)			(89)
Stock options exercised	2,035		118	1,917
Share-based compensation net tax benefit	52			52
Share-based compensation expense	6,849			6,849
Balance at Jun. 30, 2016	2,951,659	125,980	141,008	2,993,985	(573,058)	11,005	252,739
Balance at Dec. 31, 2016	2,927,924	125,980	142,026	3,028,405	(664,595)	(55,659)	351,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	147,861						147,861
Other comprehensive income, net of income taxes	7,794					7,794
Cash dividends declared on common stock	(36,696)						(36,696)
Cash dividends paid on Series C Preferred Stock	(5,119)						(5,119)
Repurchases of common stock	(45,349)				(45,349)
Restricted share unit activity	(7,810)		330	(7,850)			(290)
Stock options exercised	2,504		143	2,361
Share-based compensation expense	6,838			6,838
Balance at Jun. 30, 2017	$ 2,997,947	$ 125,980	$ 142,499	$ 3,029,754	$ (709,944)	$ (47,865)	$ 457,523

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock, per share	$ 0.30	$ 0.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net income	$ 147,861	$ 112,989
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	18,934	16,070
Depreciation, amortization, and accretion, net	29,334	28,506
Deferred income tax expense	70,484	61,283
Decrease in trading account assets	6,269	4,096
Originations of mortgage loans held for sale	(325,094)	(320,304)
Proceeds from sales of mortgage loans held for sale	323,861	299,186
Gain on sales of mortgage loans held for sale, net	(7,049)	(6,946)
Increase in other assets	(14,525)	(33,152)
(Decrease) increase in other liabilities	(9,667)	13,162
Investment securities gains, net	(7,667)	(67)
Losses and write-downs on other real estate, net	2,856	6,089
Decrease in fair value of private equity investments, net	3,166	278
Losses and write-downs on other assets held for sale, net	0	7,902
Loss on early extinguishment of debt, net	0	4,735
Share-based compensation expense	6,838	6,849
Net cash provided by operating activities	245,601	200,676
Investing Activities
Net decrease (increase) in interest earning deposits with banks	12,708	(7,154)
Net decrease (increase) in federal funds sold and securities purchased under resale agreements	11,213	(7,866)
Net decrease (increase) in interest bearing funds with Federal Reserve Bank	58,942	(74,519)
Proceeds from maturities and principal collections of investment securities available for sale	313,902	443,128
Proceeds from sales of investment securities available for sale	338,381	243,609
Purchases of investment securities available for sale	(748,754)	(623,046)
Proceeds from sales of loans	10,747	7,739
Proceeds from sales of other real estate	5,492	16,282
Net increase in loans	(612,309)	(660,778)
Purchases of bank-owned life insurance policies	(75,000)	0
Net increase in premises and equipment	(15,386)	(16,769)
Proceeds from sales of other assets held for sale	3,158	296
Net cash used in investing activities	(696,906)	(679,078)
Financing Activities
Net increase in demand and savings deposits	367,450	595,342
Net increase in certificates of deposit	202,927	87,466
Net (decrease) increase in federal funds purchased and securities sold under repurchase agreements	(9,320)	70,154
Repayments on long-term debt	(1,128,591)	(1,455,067)
Proceeds from issuance of long-term debt	1,075,000	1,400,000
Dividends paid to common shareholders	(18,349)	(30,015)
Dividends paid to preferred shareholders	(5,119)	(5,119)
Stock options exercised	2,504	2,035
Repurchases of common stock	(45,349)	(171,547)
Restricted stock activity	(7,810)	(4,605)
Net cash provided by financing activities	433,343	488,644
(Decrease) increase in cash and cash equivalents	(17,962)	10,242
Cash and cash equivalents at beginning of period	395,175	367,092
Cash and cash equivalents at end of period	377,213	377,334
Supplemental Cash Flow Information
Income tax payments, net	8,768	5,849
Interest paid	67,007	64,424
Non-cash Activities
Premises and equipment transferred to other assets held for sale	0	18,677
Other assets held for sale transferred to premises and equipment	4,450	0
Loans foreclosed and transferred to other real estate	5,516	8,631
Loans transferred to other loans held for sale at fair value	10,584	7,314
Dividends declared on common stock during the period but paid after period-end	$ 18,349	$ 0

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Note 1 - Significant Accounting Policies Business Operations The accompanying unaudited interim consolidated financial statements of Synovus Financial Corp. include the accounts of the Parent Company and its consolidated subsidiaries. Synovus Financial Corp. is a financial services company based in Columbus, Georgia. Through its wholly-owned subsidiary, Synovus Bank, a Georgia state-chartered bank that is a member of the Federal Reserve System, the company provides commercial and retail banking in addition to a full suite of specialized products and services including private banking, treasury management, wealth management, premium finance and international banking. Synovus Bank is positioned in some of the highest growth markets in the Southeast, with 248 branches and 327 ATMs in Georgia, Alabama, South Carolina, Florida, and Tennessee. Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the instructions to the SEC Form 10-Q and Article 10 of Regulation S-X; therefore, they do not include all information and footnotes necessary for a fair presentation of financial position, results of operations, comprehensive income, and cash flows in conformity with GAAP. All adjustments consisting of normally recurring accruals that, in the opinion of management, are necessary for a fair presentation of the consolidated financial position and results of operations for the periods covered by this Report have been included. The accompanying unaudited interim consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes appearing in Synovus' 2016 Form 10-K. There have been no significant changes to the accounting policies as disclosed in Synovus' 2016 Form 10-K. In preparing the unaudited interim consolidated financial statements in accordance with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the respective consolidated balance sheets and the reported amounts of revenues and expenses for the periods presented. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, the fair value of investment securities, the fair value of private equity investments, and contingent liabilities related to legal matters. Cash and Cash Equivalents Cash and cash equivalents consist of cash and due from banks. At December 31, 2016 , $ 533 thousand of the due from banks balance was restricted as to withdrawal. There were no cash and cash equivalents restricted as to withdrawal at June 30, 2017. 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 June 30, 2017 and December 31, 2016 , interest bearing funds with the Federal Reserve Bank included $120.5 million and $130.0 million , respectively, on deposit to meet Federal Reserve Bank requirements. Interest earning deposits with banks include $5.9 million and $5.6 million at June 30, 2017 and December 31, 2016 , respectively, which are pledged as collateral in connection with certain letters of credit. Federal funds sold include $43.3 million and $56.1 million at June 30, 2017 and December 31, 2016 , respectively, which are pledged to collateralize certain derivative financial instruments. Federal funds sold and securities purchased under resale agreements, and federal funds purchased and securities sold under repurchase agreements, generally mature in one day. Recently Adopted Accounting Standards Updates During 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 simplifies various 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. This accounting standard update includes a requirement to record all tax effects associated with share-based compensation through the income statement. Prior to 2017, tax benefits in excess of compensation cost (“windfalls”) and tax deficiencies (“shortfalls”) were recorded in equity. During the six and three months ended June 30, 2017 , Synovus recognized $4.5 million and $378 thousand , respectively, of income tax benefits from excess tax benefits that occurred during the six months ended June 30, 2017 from the vesting of restricted share units and exercise of stock options. As of January 1, 2017, Synovus had no previously unrecognized excess tax benefits. Additionally, beginning January 1, 2017, Synovus modified the denominator in the diluted earnings per common share calculation under the treasury stock method to exclude future excess tax benefits as part of the assumed proceeds. Synovus elected to retain its existing accounting policy election to estimate award forfeitures. During 2015, the FASB issued ASU 2015-17, Income Taxes: Balance Sheet Classification of Deferred Taxes , which became effective January 1, 2017. ASU 2015-17 requires that deferred income tax liabilities and assets be classified as noncurrent in the statement of financial position instead of separating deferred taxes into current and noncurrent amounts. Also, valuation allowances will no longer be classified between current and noncurrent because these allowances will be required to be classified as noncurrent under the new standard. This ASU only impacts classification in the balance sheet, and has no impact on required deferred tax footnote disclosures (i.e., required presentation of “gross” deferred tax assets and “gross” deferred tax liabilities). The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by this ASU. There is no impact to our balance sheet as a result of this standard because Synovus has not historically distinguished deferred taxes on the balance sheet as current vs. non-current. Reclassifications Prior periods' consolidated financial statements are reclassified whenever necessary to conform to the current periods' presentation.

Acquisition

Acquisition	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisition	Note 2 - Acquisition On October 1, 2016, Synovus completed its acquisition of all of the outstanding stock of Global One. Prior to its acquisition, Global One was an Atlanta-based private specialty financial services company that lended 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 former 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 following table. 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 reflect measurement period adjustments to the amounts reported as of December 31, 2016, the most significant of which consist of a reduction in goodwill of $2.6 million and a decrease in the estimated fair value of contingent consideration of $1.8 million (the income statement impact of such adjustments was insignificant). These fair value estimates are considered preliminary and are subject to change for up to one year after the closing date of the acquisition as additional information becomes available. Global One October 1, 2016 (in thousands) Fair Value Assets acquired: Cash and due from banks $ 9,554 Commercial and industrial loans (1) 357,307 Goodwill (2) 32,661 Other intangible assets 12,500 Other assets 3,904 Total assets acquired $ 415,926 Liabilities assumed: Notes payable (3) $ 358,560 Contingent consideration 12,234 Deferred tax liability, net 3,229 Other liabilities 11,903 Total liabilities assumed $ 385,926 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 "Global One Earnings," as defined in the merger agreement. The Earnout Payments will consist of shares of Synovus common stock as well as a smaller cash consideration component. Other intangible assets consist of existing borrower relationships ( 11 years useful life), trade name ( 10 years useful life), and distribution network ( 8 years useful life) with June 30, 2017 net carrying values of $10.1 million , $1.0 million , and $544 thousand , respectively. The following is a description of the methods used to determine the fair values of significant assets and liabilities: Commercial and industrial loans : The fair value of loans was determined based on a discounted cash flow approach. The most significant assumptions used in the valuation of the loan portfolio consisted of the prepayment rate, the probability of extension at maturity, the interest rates on extended loans, and the discount rates. All loans are fully collateralized by cash value life insurance policies and/or annuities issued by investment grade insurance companies. Based on a history of no principal losses on the loan portfolio since inception as well as the collateral position, no losses were estimated in the event of default. Notes payable : The notes payable were extinguished immediately after the closing of the acquisition. Accordingly, the fair value of notes payable was determined based on the amounts paid to extinguish such notes, inclusive of applicable prepayment penalties, which is consistent with the perspective of a market participant. Contingent consideration : The fair value of the contingent consideration, which represents the fair value of the above referenced Earnout Payments, was determined based on option pricing methods and a Monte Carlo simulation. The most significant assumptions used in the valuation of the contingent consideration were the expected cash flows, volatility, and discount rates. Future changes in the fair value of the contingent consideration will be recognized in earnings until the contingent consideration arrangement is settled.

Share Repurchase Program

Share Repurchase Program	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Share Repurchase Program	Note 3 - Share Repurchase Program Synovus' Board of Directors authorized an up to $200 million share repurchase program that will expire at the end of 2017. This program was announced on January 17, 2017. As of June 30, 2017 , Synovus had repurchased under this program a total of $45.3 million , or 1.1 million shares, at an average price of $42.04 per share.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2017
Investments [Abstract]
Investment Securities	Note 4 - Investment Securities The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities available for sale at June 30, 2017 and December 31, 2016 are summarized below. June 30, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 83,493 — (360 ) 83,133 U.S. Government agency securities 12,088 223 — 12,311 Mortgage-backed securities issued by U.S. Government agencies 132,710 640 (1,125 ) 132,225 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,881,234 6,169 (30,998 ) 2,856,405 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 734,804 84 (12,468 ) 722,420 State and municipal securities 290 — — 290 Corporate debt and other securities 20,279 205 (210 ) 20,274 Total investment securities available for sale $ 3,864,898 7,321 (45,161 ) 3,827,058 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 Corporate debt and other securities 20,247 — (407 ) 19,840 Total investment securities available for sale $ 3,768,618 11,114 (61,537 ) 3,718,195 At June 30, 2017 and December 31, 2016 , investment securities with a carrying value of $1.73 billion and $2.04 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 June 30, 2017 and December 31, 2016 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 June 30, 2017 , Synovus had 92 investment securities in a loss position for less than twelve months and 3 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 June 30, 2017 and December 31, 2016 are presented below. June 30, 2017 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 $ 64,342 360 — — 64,342 360 Mortgage-backed securities issued by U.S. Government agencies 95,492 1,125 — — 95,492 1,125 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,161,449 30,998 — — 2,161,449 30,998 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 668,342 11,678 23,212 790 691,554 12,468 Corporate debt and other securities — — 5,069 210 5,069 210 Total $ 2,989,625 44,161 28,281 1,000 3,017,906 45,161 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 Corporate debt and other securities 14,952 48 4,888 359 19,840 407 Total $ 3,012,769 60,156 33,315 1,381 3,046,084 61,537 The amortized cost and fair value by contractual maturity of investment securities available for sale at June 30, 2017 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 June 30, 2017 (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 $ 18,791 64,702 — — — 83,493 U.S. Government agency securities 1,000 5,612 5,476 — — 12,088 Mortgage-backed securities issued by U.S. Government agencies — — 34,868 97,842 — 132,710 Mortgage-backed securities issued by U.S. Government sponsored enterprises 47 2,262 535,035 2,343,890 — 2,881,234 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 22,173 712,631 — 734,804 State and municipal securities 110 180 — — — 290 Corporate debt and other securities — — 15,000 2,000 3,279 20,279 Total amortized cost $ 19,948 72,756 612,552 3,156,363 3,279 3,864,898 Fair Value U.S. Treasury securities $ 18,791 64,342 — — — 83,133 U.S. Government agency securities 1,004 5,682 5,625 — — 12,311 Mortgage-backed securities issued by U.S. Government agencies — — 35,007 97,218 — 132,225 Mortgage-backed securities issued by U.S. Government sponsored enterprises 48 2,390 529,968 2,323,999 — 2,856,405 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 21,950 700,470 — 722,420 State and municipal securities 110 180 — — — 290 Corporate debt and other securities — — 15,205 1,927 3,142 20,274 Total fair value $ 19,953 72,594 607,755 3,123,614 3,142 3,827,058 Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the three months ended June 30, 2017 and 2016 are presented below. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale. Six Months Ended June 30, Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Proceeds from sales of investment securities available for sale $ 338,381 243,609 $ 55,752 — Gross realized gains on sales 7,942 954 239 — Gross realized losses on sales (275 ) (887 ) (240 ) — Investment securities gains, net $ 7,667 67 $ (1 ) —

Restructuring Charges

Restructuring Charges	6 Months Ended
	Jun. 30, 2017
Restructuring Charges [Abstract]
Restructuring Charges	Note 5 - Restructuring Charges For the six and three months ended June 30, 2017 and 2016 , total restructuring charges consist of the following components: Six Months Ended June 30, Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Severance charges $ 6,453 — $ — — Lease termination charges — 31 — (13 ) Asset impairment charges — 6,866 — 5,821 Loss (gain) on sale of assets held for sale, net (4 ) 13 (4 ) 13 Other charges 75 71 17 20 Total restructuring charges, net $ 6,524 6,981 $ 13 5,841 During the first quarter of 2017, Synovus recorded severance charges of $6.5 million including $6.2 million for termination benefits incurred in conjunction with a voluntary early retirement program offered during the first quarter of 2017. This program was part of Synovus' ongoing efficiency initiatives. The $6.2 million accrual was based on the benefits to be paid to employees who accepted the early retirement offer on or prior to the expiration of the program on March 30, 2017. For the three months ended June 30, 2016, Synovus recorded restructuring charges of $5.8 million with $4.8 million of those charges related to Synovus' corporate real estate optimization activities and $1.0 million associated with branch closures. Restructuring charges associated with branch closures during the first quarter of 2016 totaled $1.1 million . The following tables present aggregate activity within the accrual for restructuring charges for the six and three months ended June 30, 2017 and 2016 : (in thousands) Severance Charges Lease Termination Charges Total Balance at December 31, 2016 $ 81 3,968 4,049 Accruals for voluntary and involuntary termination benefits 6,453 — 6,453 Payments (2,803 ) (438 ) (3,241 ) Balance at June 30, 2017 $ 3,731 3,530 7,261 Balance at April 1, 2017 6,315 3,689 10,004 Payments (2,584 ) (159 ) (2,743 ) Balance at June 30, 2017 $ 3,731 3,530 7,261 (in thousands) Severance Charges Lease Termination Charges Total Balance at December 31, 2015 $ 1,930 4,687 6,617 Accruals for lease terminations — 31 31 Payments (1,337 ) (343 ) (1,680 ) Balance at June 30, 2016 $ 593 4,375 4,968 Balance at April 1, 2016 1,533 4,545 6,078 Accruals for lease terminations — (13 ) (13 ) Payments (940 ) (157 ) (1,097 ) Balance at June 30, 2016 $ 593 4,375 4,968 All other charges were paid in the quarters that they were incurred. No other restructuring charges resulted in payment accruals.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2017
Loans and Allowance for Loan Losses [Abstract]
Loans and Allowance for Loan Losses	Note 6 - Loans and Allowance for Loan Losses The following is a summary of current, accruing past due, and non-accrual loans by portfolio class as of June 30, 2017 and December 31, 2016 . Current, Accruing Past Due, and Non-accrual Loans June 30, 2017 (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 $ 6,028,397 3,482 72 3,554 3,712 6,035,663 1-4 family properties 818,327 8,657 101 8,758 8,535 835,620 Land and development 529,967 1,964 126 2,090 10,931 542,988 Total commercial real estate 7,376,691 14,103 299 14,402 23,178 7,414,271 Commercial, financial and agricultural 6,915,588 14,670 765 15,435 69,550 7,000,573 Owner-occupied 4,715,325 9,291 801 10,092 24,918 4,750,335 Total commercial and industrial 11,630,913 23,961 1,566 25,527 94,468 11,750,908 Home equity lines 1,533,528 8,286 705 8,991 20,648 1,563,167 Consumer mortgages 2,444,866 7,141 623 7,764 18,035 2,470,665 Credit cards 223,092 1,550 1,258 2,808 — 225,900 Other consumer loans 1,021,355 7,197 99 7,296 2,988 1,031,639 Total consumer 5,222,841 24,174 2,685 26,859 41,671 5,291,371 Total loans $ 24,230,445 62,238 4,550 66,788 159,317 24,456,550 (1 ) 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 $ 5,861,198 2,795 — 2,795 5,268 5,869,261 1-4 family properties 873,231 4,801 161 4,962 9,114 887,307 Land and development 591,732 1,441 — 1,441 16,233 609,406 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 consumer loans 809,419 5,771 39 5,810 2,954 818,183 Total consumer 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 (2 ) (1) Total before net deferred fees and costs of $26.0 million . (2) Total before net deferred fees and costs of $26.0 million . The credit quality of the loan portfolio is reviewed and updated no less frequently than quarterly using the standard asset classification system utilized by the federal banking agencies. These classifications are divided into three groups – Not Criticized (Pass), Special Mention, and Classified or Adverse rating (Substandard, Doubtful, and Loss) and are defined as follows: Pass - loans which are well protected by the current net worth and paying capacity of the obligor (or guarantors, if any) or by the fair value, less cost to acquire and sell in a timely manner, of any underlying collateral. Special Mention - loans which have potential weaknesses that deserve management's close attention. These loans are not adversely classified and do not expose an institution to sufficient risk to warrant an adverse classification. Substandard - loans which are inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. Loans with this classification are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful - loans which have all the weaknesses inherent in loans classified as Substandard with the added characteristic that the weaknesses make collection or liquidation in full highly questionable and improbable on the basis of currently known facts, conditions, and values. Loss - loans which are considered by management to be uncollectible and of such little value that their continuance on the institution's books as an asset, without establishment of a specific valuation allowance or charge-off, is not warranted. In the following tables, consumer 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 consumer 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 any associated senior liens with other financial institutions. Loan Portfolio Credit Exposure by Risk Grade June 30, 2017 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,952,286 61,451 21,926 — — 6,035,663 1-4 family properties 788,665 24,169 22,559 227 — 835,620 Land and development 477,974 40,576 21,227 3,211 — 542,988 Total commercial real estate 7,218,925 126,196 65,712 3,438 — 7,414,271 Commercial, financial and agricultural 6,710,038 124,412 160,354 5,629 140 (3) 7,000,573 Owner-occupied 4,590,414 52,101 106,410 1,410 — 4,750,335 Total commercial and industrial 11,300,452 176,513 266,764 7,039 140 11,750,908 Home equity lines 1,535,583 — 24,812 373 2,399 (3) 1,563,167 Consumer mortgages 2,450,658 — 19,528 313 166 (3) 2,470,665 Credit cards 224,643 — 445 — 812 (4) 225,900 Other consumer loans 1,028,493 — 2,808 299 39 (3) 1,031,639 Total consumer 5,239,377 — 47,593 985 3,416 5,291,371 Total loans $ 23,758,754 302,709 380,069 11,462 3,556 24,456,550 (5 ) December 31, 2016 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,794,626 43,336 31,299 — — 5,869,261 1-4 family properties 826,311 33,928 26,790 278 — 887,307 Land and development 514,853 60,205 27,361 6,987 — 609,406 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 consumer loans 814,844 — 3,233 42 64 (3) 818,183 Total consumer 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 (6 ) (1) Includes $235.8 million and $256.6 million of Substandard accruing loans at June 30, 2017 and December 31, 2016 , 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 $26.0 million . The following table details the changes in the allowance for loan losses by loan segment for the six and three months ended June 30, 2017 . Allowance for Loan Losses and Recorded Investment in Loans As of and For The Six Months Ended June 30, 2017 (in thousands) Commercial Real Estate Commercial & Industrial Retail Total Allowance for loan losses: Beginning balance $ 81,816 125,778 44,164 251,758 Charge-offs (3,207 ) (19,535 ) (9,656 ) (32,398 ) Recoveries 3,648 3,282 2,871 9,801 Provision for loan losses (4,730 ) 13,912 9,752 18,934 Ending balance (1) $ 77,527 123,437 47,131 248,095 Ending balance: individually evaluated for impairment 4,386 7,226 1,038 12,650 Ending balance: collectively evaluated for impairment $ 73,141 116,211 46,093 235,445 Loans: Ending balance: total loans (1)(2) $ 7,414,271 11,750,908 5,291,371 24,456,550 Ending balance: individually evaluated for impairment 73,638 122,889 31,688 228,215 Ending balance: collectively evaluated for impairment $ 7,340,633 11,628,019 5,259,683 24,228,335 As of and For The Six Months Ended June 30, 2016 (in thousands) Commercial Real Estate Commercial & Industrial Retail Total Allowance for loan losses: Beginning balance $ 87,133 122,989 42,374 252,496 Charge-offs (9,277 ) (10,661 ) (7,148 ) (27,086 ) Recoveries 6,690 4,342 2,564 13,596 Provision for loan losses (5,187 ) 12,963 8,294 16,070 Ending balance (1) $ 79,359 129,633 46,084 255,076 Ending balance: individually evaluated for impairment 12,515 14,221 1,691 28,427 Ending balance: collectively evaluated for impairment $ 66,844 115,412 44,393 226,649 Loans: Ending balance: total loans (1)(3) $ 7,507,695 10,955,430 4,625,410 23,088,535 Ending balance: individually evaluated for impairment 112,954 119,805 37,788 270,547 Ending balance: collectively evaluated for impairment $ 7,394,741 10,835,625 4,587,622 22,817,988 (1) As of and for the six months ended June 30, 2017 and 2016, there were no purchased credit-impaired loans and no allowance for loan losses for purchased credit-impaired loans. (2) Total before net deferred fees and costs of $26.0 million . (3) Total before net deferred fees and costs of $27.6 million . Allowance for Loan Losses and Recorded Investment in Loans As Of and For The Three Months Ended June 30, 2017 (in thousands) Commercial Real Estate Commercial & Industrial Consumer Total Allowance for loan losses: Beginning balance $ 78,314 127,096 48,104 253,514 Charge-offs (1,299 ) (12,642 ) (5,722 ) (19,663 ) Recoveries 759 1,458 1,767 3,984 Provision for loan losses (247 ) 7,525 2,982 10,260 Ending balance (1) $ 77,527 123,437 47,131 248,095 Ending balance: individually evaluated for impairment 4,386 7,226 1,038 12,650 Ending balance: collectively evaluated for impairment $ 73,141 116,211 46,093 235,445 Loans: Ending balance: total loans (1)(2) $ 7,414,271 11,750,908 5,291,371 24,456,550 Ending balance: individually evaluated for impairment 73,638 122,889 31,688 228,215 Ending balance: collectively evaluated for impairment $ 7,340,633 11,628,019 5,259,683 24,228,335 As Of and For The Three Months Ended June 30, 2016 (in thousands) Commercial Real Estate Commercial & Industrial Consumer Total Allowance for loan losses: Beginning balance $ 84,557 124,878 45,081 254,516 Charge-offs (7,455 ) (5,136 ) (3,180 ) (15,771 ) Recoveries 5,397 3,078 1,163 9,638 Provision for loan losses (3,140 ) 6,813 3,020 6,693 Ending balance (1) $ 79,359 129,633 46,084 255,076 Ending balance: individually evaluated for impairment 12,515 14,221 1,691 28,427 Ending balance: collectively evaluated for impairment $ 66,844 115,412 44,393 226,649 Loans: Ending balance: total loans (1)(3) $ 7,507,695 10,955,430 4,625,410 23,088,535 Ending balance: individually evaluated for impairment 112,954 119,805 37,788 270,547 Ending balance: collectively evaluated for impairment $ 7,394,741 10,835,625 4,587,622 22,817,988 (1) For the three months ended June 30, 2017 and 2016, there were no purchased credit-impaired loans and no allowance for loan losses for purchased credit-impaired loans. (2) Total before net deferred fees and costs of $26.0 million . (3) Total before net deferred fees and costs of $27.6 million . The tables below summarize impaired loans (including accruing TDRs) as of June 30, 2017 and December 31, 2016 . Impaired Loans (including accruing TDRs) June 30, 2017 Six Months Ended June 30, 2017 Three Months Ended June 30, 2017 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded Investment properties $ — — — 246 — — — 1-4 family properties 253 2,582 — 380 — 257 — Land and development 2,226 5,539 — 2,193 — 2,246 — Total commercial real estate 2,479 8,121 — 2,819 — 2,503 — Commercial, financial and agricultural 26,913 33,098 — 22,956 — 26,202 — Owner-occupied 13,824 20,250 — 10,383 — 11,910 — Total commercial and industrial 40,737 53,348 — 33,339 — 38,112 — Home equity lines 1,064 1,064 — 1,060 — 1,064 — Consumer mortgages 744 941 — 744 — 744 — Credit cards — — — — — — — Other consumer loans — — — — — — — Total consumer 1,808 2,005 — 1,804 — 1,808 — Total impaired loans with no related allowance recorded $ 45,024 63,474 — 37,962 — 42,423 — With allowance recorded Investment properties $ 29,168 29,168 1,175 29,575 597 29,264 306 1-4 family properties 15,879 15,893 448 16,995 386 16,133 250 Land and development 26,112 26,168 2,763 27,381 299 26,366 126 Total commercial real estate 71,159 71,229 4,386 73,951 1,282 71,763 682 Commercial, financial and agricultural 46,569 46,887 5,524 46,455 787 48,959 436 Owner-occupied 35,583 35,594 1,702 42,814 674 38,318 336 Total commercial and industrial 82,152 82,481 7,226 89,269 1,461 87,277 772 Home equity lines 7,135 7,135 171 8,197 465 7,680 229 Consumer mortgages 18,762 18,762 598 19,720 183 19,009 92 Credit cards — — — — — — — Other consumer loans 3,983 3,984 269 4,692 132 4,380 59 Total consumer 29,880 29,881 1,038 32,609 780 31,069 380 Total impaired loans with allowance recorded $ 183,191 183,591 12,650 195,829 3,523 190,109 1,834 Total impaired loans Investment properties $ 29,168 29,168 1,175 29,821 597 29,264 306 1-4 family properties 16,132 18,475 448 17,375 386 16,390 250 Land and development 28,338 31,707 2,763 29,574 299 28,612 126 Total commercial real estate 73,638 79,350 4,386 76,770 1,282 74,266 682 Commercial, financial and agricultural 73,482 79,985 5,524 69,411 787 75,161 436 Owner-occupied 49,407 55,844 1,702 53,197 674 50,228 336 Total commercial and industrial 122,889 135,829 7,226 122,608 1,461 125,389 772 Home equity lines 8,199 8,199 171 9,257 465 8,744 229 Consumer mortgages 19,506 19,703 598 20,464 183 19,753 92 Credit cards — — — — — — — Other consumer loans 3,983 3,984 269 4,692 132 4,380 59 Total consumer 31,688 31,886 1,038 34,413 780 32,877 380 Total impaired loans $ 228,215 247,065 12,650 233,791 3,523 232,532 1,834 Impaired Loans (including accruing TDRs) December 31, 2016 Year Ended 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 — 2,013 — 1-4 family properties 643 2,939 — 1,021 — Land and development 2,099 7,243 — 6,769 — 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 consumer loans — — — — — Total consumer 1,795 1,865 — 1,915 — Total impaired loans with no related allowance recorded $ 28,751 40,794 — 26,433 — With allowance recorded Investment properties $ 31,489 31,489 2,044 42,659 1,436 1-4 family properties 23,642 23,649 769 39,864 855 Land and development 32,789 32,788 5,103 25,568 995 Total commercial real estate 87,920 87,926 7,916 108,091 3,286 Commercial, financial and agricultural 43,386 45,913 5,687 51,968 1,215 Owner-occupied 53,708 53,942 2,697 52,300 1,946 Total commercial and industrial 97,094 99,855 8,384 104,268 3,161 Home equity lines 9,638 9,638 971 9,668 432 Consumer mortgages 20,953 20,953 673 20,993 1,014 Credit cards — — — — — Other consumer loans 5,140 5,140 167 5,062 303 Total consumer 35,731 35,731 1,811 35,723 1,749 Total impaired loans with allowance recorded $ 220,745 223,512 18,111 248,082 8,196 Total impaired loans Investment properties $ 32,237 32,282 2,044 44,672 1,436 1-4 family properties 24,285 26,588 769 40,885 855 Land and development 34,888 40,031 5,103 32,337 995 Total commercial real estate 91,410 98,901 7,916 117,894 3,286 Commercial, financial and agricultural 61,344 66,490 5,687 58,289 1,215 Owner-occupied 59,216 61,319 2,697 60,694 1,946 Total commercial and industrial 120,560 127,809 8,384 118,983 3,161 Home equity lines 10,689 10,689 971 10,713 432 Consumer mortgages 21,697 21,767 673 21,863 1,014 Credit cards — — — — — Other consumer loans 5,140 5,140 167 5,062 303 Total consumer 37,526 37,596 1,811 37,638 1,749 Total impaired loans $ 249,496 264,306 18,111 274,515 8,196 The average recorded investment in impaired loans was $290.3 million and $281.9 million , respectively, for the six and three months ended June 30, 2016 . Excluding accruing TDRs, there was no interest income recognized for the investment in impaired loans for the six and three months ended June 30, 2016 . Interest income recognized for accruing TDRs was $4.0 million and $2.0 million , respectively, for the six and three months ended June 30, 2016 . At June 30, 2017 and December 31, 2016 , impaired loans of $60.8 million and $53.7 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 an extension of the maturity of the loan generally for less than one year. Insignificant periods of reduction of principal and/or interest payments, or one-time deferrals of 3 months or less, are generally not considered to be financial concessions. The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the six and three months ended June 30, 2017 and 2016 that were reported as accruing or non-accruing TDRs. TDRs by Concession Type Six Months Ended June 30, 2017 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties — $ — — — — 1-4 family properties 16 — 2,089 513 2,602 Land acquisition 1 — — 135 135 Total commercial real estate 17 — 2,089 648 2,737 Commercial, financial and agricultural 28 — 5,760 6,279 12,039 Owner-occupied 1 — — 22 22 Total commercial and industrial 29 — 5,760 6,301 12,061 Home equity lines — — — — — Consumer mortgages 1 — — 9 9 Credit cards — — — — — Other retail loans 8 — — 570 570 Total retail 9 — — 579 579 Total TDRs 55 $ — 7,849 7,528 15,377 (1 ) Three Months Ended June 30, 2017 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties — $ — — — — 1-4 family properties 8 — 478 196 674 Land and development 1 — — 135 135 Total commercial real estate 9 — 478 331 809 Commercial, financial and agricultural 10 — 1,895 740 2,635 Owner-occupied 1 — — 22 22 Total commercial and industrial 11 — 1,895 762 2,657 Home equity lines — — — — — Consumer mortgages 1 — — 9 9 Credit cards — — — — — Other consumer loans 5 — — 295 295 Total consumer 6 — — 304 304 Total TDRs 26 $ — 2,373 1,397 3,770 (1 ) (1) No net charge-offs were recorded during the six and three months ended June 30, 2017 upon restructuring of these loans. TDRs by Concession Type Six Months Ended June 30, 2016 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties 3 $ — 1,826 148 1,974 1-4 family properties 19 — 3,490 1,164 4,654 Land acquisition 11 — — 1,269 1,269 Total commercial real estate 33 — 5,316 2,581 7,897 Commercial, financial and agricultural 45 — 13,948 4,845 18,793 Owner-occupied 6 — 2,667 550 3,217 Total commercial and industrial 51 — 16,615 5,395 22,010 Home equity lines 3 — 224 — 224 Consumer mortgages 6 — 354 51 405 Credit cards — — — — — Other retail loans 17 — 324 1,534 1,858 Total retail 26 — 902 1,585 2,487 Total TDRs 110 $ — 22,833 9,561 32,394 (2 ) Three Months Ended June 30, 2016 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties 1 $ — 1,389 — 1,389 1-4 family properties 12 — 3,095 324 3,419 Land and development 5 — — 734 734 Total commercial real estate 18 — 4,484 1,058 5,542 Commercial, financial and agricultural 15 — 1,934 1,458 3,392 Owner-occupied 2 — 1,132 102 1,234 Total commercial and industrial 17 — 3,066 1,560 4,626 Home equity lines 1 — 28 — 28 Consumer mortgages 3 — 200 51 251 Credit cards — — — — — Other consumer loans 10 — 94 1,449 1,543 Total consumer 14 — 322 1,500 1,822 Total TDRs 49 $ — 7,872 4,118 11,990 (2 ) (2) No net charge-offs were recorded during the six and three months ended June 30, 2016 upon restructuring of these loans. For both the six and three months ended June 30, 2017 , there were three defaults with a recorded investment of $292 thousand on accruing TDRs restructured during the previous twelve months (defaults are defined as the earlier of the TDR being placed on non-accrual status or reaching 90 days past due with respect to principal and/or interest payments) compared to one default for both the six and three months ended June 30, 2016 with a recorded investment of $92 thousand . If, at the time a loan was designated as a TDR, the loan was not already impaired, the measurement of impairment that resulted from the TDR designation closely approximates the reserve derived through specific loan measurement of impairment in accordance with ASC 310-10-35. Generally, the change in the allowance for loan losses resulting from such TDR designation is not significant. At June 30, 2017 , the allowance for loan losses allocated to accruing TDRs totaling $167.4 million was $8.5 million compared to accruing TDRs of $195.8 million with an allocated allowance for loan losses of $9.8 million at December 31, 2016 . Non-accrual, non-homogeneous loans (commercial-type impaired loans greater than $1 million ) that are designated as TDRs are individually measured for the amount of impairment, if any, both before and after the TDR designation.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Other Comprehensive Income (Loss)	Note 7 - Other Comprehensive Income (Loss) The following tables illustrate activity within the balances in accumulated other comprehensive income (loss) by component for the six and three months ended June 30, 2017 and 2016 . 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, 2016 $ (12,217 ) (44,324 ) 882 (55,659 ) Other comprehensive income before reclassifications — 12,453 — 12,453 Amounts reclassified from accumulated other comprehensive income (loss) 80 (4,715 ) (24 ) (4,659 ) Net current period other comprehensive income 80 7,738 (24 ) 7,794 Balance as of June 30, 2017 $ (12,137 ) (36,586 ) 858 (47,865 ) Balance as of April 1, 2017 $ (12,177 ) (43,444 ) 870 (54,751 ) Other comprehensive income before reclassifications — 6,857 — 6,857 Amounts reclassified from accumulated other comprehensive income (loss) 40 1 (12 ) 29 Net current period other comprehensive income 40 6,858 (12 ) 6,886 Balance as of June 30, 2017 $ (12,137 ) (36,586 ) 858 (47,865 ) 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, 2015 $ (12,504 ) (18,222 ) 907 (29,819 ) Other comprehensive income before reclassifications — 40,722 — 40,722 Amounts reclassified from accumulated other comprehensive income (loss) 207 (41 ) (64 ) 102 Net current period other comprehensive income 207 40,681 (64 ) 40,824 Balance as of June 30, 2016 $ (12,297 ) 22,459 843 11,005 Balance as of April 1, 2016 $ (12,336 ) 10,747 849 (740 ) Other comprehensive income (loss) before reclassifications — 11,712 — 11,712 Amounts reclassified from accumulated other comprehensive income (loss) 39 — (6 ) 33 Net current period other comprehensive income (loss) 39 11,712 (6 ) 11,745 Balance as of June 30, 2016 $ (12,297 ) 22,459 843 11,005 In accordance with ASC 740-20-45-11(b), a deferred tax asset valuation allowance associated with unrealized gains and losses not recognized in income is charged directly to other comprehensive income (loss). During the years 2010 and 2011, Synovus recorded a deferred tax asset valuation allowance associated with unrealized gains and losses not recognized in income directly to other comprehensive income (loss) by applying the portfolio approach for allocation of the valuation allowance. Synovus has consistently applied the portfolio approach which treats derivative financial instruments, equity securities, and debt securities as a single portfolio. As of June 30, 2017 , the balance in net unrealized gains (losses) on cash flow hedges and net unrealized gains (losses) on investment securities available for sale includes unrealized losses of $12.1 million and $13.3 million , respectively, related to the residual tax effects remaining in OCI due to a previously established deferred tax asset valuation allowance. Under the portfolio approach, these unrealized losses are realized at the time the entire portfolio is sold or disposed. 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 Six Months Ended June 30, 2017 2016 Net unrealized gains (losses) on cash flow hedges: Amortization of deferred losses $ (130 ) (140 ) Interest expense Amortization of deferred losses — (197 ) Loss on early extinguishment of debt, net 50 130 Income tax (expense) benefit $ (80 ) (207 ) Reclassifications, net of income taxes Net unrealized gains on investment securities available for sale: Realized gain on sale of securities $ 7,667 67 Investment securities gains, net (2,952 ) (26 ) Income tax (expense) benefit $ 4,715 41 Reclassifications, net of income taxes Post-retirement unfunded health benefit: Amortization of actuarial gains $ 40 104 Salaries and other personnel expense (16 ) (40 ) Income tax (expense) benefit $ 24 64 Reclassifications, net of income taxes 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 Three Months Ended June 30, 2017 2016 Net unrealized gains (losses) on cash flow hedges: Amortization of deferred losses $ (65 ) (64 ) Interest expense 25 25 Income tax (expense) benefit $ (40 ) (39 ) Reclassifications, net of income taxes Net unrealized gains on investment securities available for sale: Realized net (loss)gain on sale of securities $ (1 ) — Investment securities gains, net — — Income tax (expense) benefit $ (1 ) — Reclassifications, net of income taxes Post-retirement unfunded health benefit: Amortization of actuarial gains $ 20 10 Salaries and other personnel expense (8 ) (4 ) Income tax (expense) benefit $ 12 6 Reclassifications, net of income taxes

Fair Value Accounting

Fair Value Accounting	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Accounting	Note 8 - Fair Value Accounting Synovus carries various assets and liabilities at fair value based on the fair value accounting guidance under ASC 820, Fair Value Measurements , and ASC 825, Financial Instruments . Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an “exit price”) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Fair Value Hierarchy Synovus determines the fair value of its financial instruments based on the fair value hierarchy established under ASC 820-10, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the financial instrument's fair value measurement in its entirety. There are three levels of inputs that may be used to measure fair value. The three levels of inputs of the valuation hierarchy are defined below: Level 1 Quoted prices (unadjusted) in active markets for identical assets and liabilities for the instrument or security to be valued. Level 1 assets include marketable equity securities, U.S. Treasury securities, and mutual funds. Level 2 Observable inputs other than Level 1 quoted prices, such as quoted prices for similar assets and liabilities in active markets, quoted prices in markets that are not active or model-based valuation techniques for which all significant assumptions are derived principally from or corroborated by observable market data. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose value is determined by using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. U.S. Government sponsored agency securities, mortgage-backed securities issued by U.S. Government sponsored enterprises and agencies, obligations of states and municipalities, collateralized mortgage obligations issued by U.S. Government sponsored enterprises, and mortgage loans held-for-sale are generally included in this category. Level 3 Unobservable inputs that are supported by little, if any, market activity for the asset or liability. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow models and similar techniques, and may also include the use of market prices of assets or liabilities that are not directly comparable to the subject asset or liability. These methods of valuation may result in a significant portion of the fair value being derived from unobservable assumptions that reflect Synovus' own estimates for assumptions that market participants would use in pricing the asset or liability. This category primarily includes collateral-dependent impaired loans, other real estate, certain equity investments, private equity investments, GGL/SBA loan servicing assets, and contingent consideration. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 16 - Fair Value Accounting" to the consolidated financial statements of Synovus' 2016 Form 10-K for a description of valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis. Assets and Liabilities Measured at Fair Value on a Recurring Basis The following table presents all financial instruments measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016 , 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 during the six and three months ended June 30, 2017 and year ended December 31, 2016 were inconsequential. June 30, 2017 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: U.S. Government agency securities — 1,587 — 1,587 Collateralized mortgage obligations issued by U.S. Government sponsored enterprises — 386 — 386 State and municipal securities — 1,072 — 1,072 Total trading securities $ — 3,045 — 3,045 Mortgage loans held for sale — 61,893 — 61,893 Investment securities available for sale: U.S. Treasury securities 83,133 — — 83,133 U.S. Government agency securities — 12,311 — 12,311 Mortgage-backed securities issued by U.S. Government agencies — 132,225 — 132,225 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 2,856,405 — 2,856,405 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 722,420 — 722,420 State and municipal securities — 290 — 290 Corporate debt and other securities (1) 3,142 15,205 1,927 20,274 Total investment securities available for sale $ 86,275 3,738,856 1,927 3,827,058 Private equity investments — 15,698 15,698 Mutual funds held in rabbi trusts 12,867 — — 12,867 GGL/SBA loans servicing asset — — 4,297 4,297 Derivative assets: Interest rate contracts — 15,332 — 15,332 Mortgage derivatives (2) — 1,393 — 1,393 Total derivative assets $ — 16,725 — 16,725 Liabilities Earnout liability (3) — — 13,941 13,941 Derivative liabilities: Interest rate contracts — 13,389 — 13,389 Visa derivative — — 5,053 5,053 Total derivative liabilities $ — 13,389 5,053 18,442 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 Corporate debt and other securities (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 Earnout liability (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 (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) Earnout liability consists of contingent consideration obligation related to the 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 are recorded as a component of mortgage banking income in the Consolidated Statements of Income. An immaterial portion of these changes in fair value was attributable to changes in instrument-specific credit risk. Changes in Fair Value Included in Net Income For the Six Months Ended June 30, For the Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Mortgage loans held for sale $ 954 1,850 $ (249 ) 878 Mortgage Loans Held for Sale (in thousands) As of June 30, 2017 As of December 31, 2016 Fair value $ 61,893 51,545 Unpaid principal balance 60,508 51,114 Fair value less aggregate unpaid principal balance $ 1,385 431 Changes in Level 3 Fair Value Measurements and Quantitative Information about Level 3 Fair Value Measurements As noted above, Synovus uses significant unobservable inputs 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 Sheets for the six and three months ended June 30, 2017 and 2016 (including the change in fair value), for financial instruments of a material nature that are classified by Synovus within Level 3 of the fair value hierarchy and are measured at fair value on a recurring basis. Transfers between fair value levels are recognized at the end of the reporting period in which the associated changes in inputs occur. During the six and three months ended June 30, 2017 and 2016 , Synovus did not have any transfers between levels in the fair value hierarchy. Six Months Ended June 30, 2017 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Earnout Liability (1) GGL / SBA Loans Servicing Asset (2) Beginning balance, January 1, $ 1,796 25,493 (5,768 ) (14,000 ) — Total gains (losses) realized/unrealized: Included in earnings — (3,166 ) — (1,707 ) (694 ) Unrealized gains (losses) included in other comprehensive income 131 — — — — Additions — — — — 539 Sales and settlements — (6,629 ) 715 — — Transfer from amortization method to fair value — — — — 4,452 Measurement period adjustments related to Global One acquisition — — — 1,766 — Ending balance, June 30, $ 1,927 15,698 (5,053 ) (13,941 ) 4,297 Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — (3,166 ) — (1,707 ) (694 ) Three Months Ended June 30, 2017 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Earnout Liability (1) GGL / SBA Loans Servicing Asset (2) Beginning balance, April 1, $ 1,851 23,679 (5,412 ) (11,421 ) 4,178 Total gains (losses) realized/unrealized: Included in earnings — (1,352 ) — (1,707 ) (376 ) Unrealized gains (losses) included in other comprehensive income 76 — — — — Additions — — — — 495 Sales and settlements — (6,629 ) 359 — — Measurement period adjustments related to Global One acquisition — — — (813 ) — Ending balance, June 30, $ 1,927 15,698 (5,053 ) (13,941 ) 4,297 Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — (1,352 ) — (1,707 ) (376 ) (1) Earnout liability consists of contingent consideration obligation related to the Global One acquisition. (2) Effective January 1, 2017, Synovus elected the fair value option for determining the value of the GGL/SBA loans servicing asset. Synovus has retained servicing responsibilities on sold GGL/SBA loans and receives a servicing fee. The servicing asset is established at fair value at the time of the sale based on an analysis of future cash flows that incorporates estimates for discount rates, prepayment speeds, and delinquency rates. The servicing asset is measured at fair value on a quarterly basis with changes in fair value included with the associated servicing fee in other non-interest income. Prior to 2017, Synovus accounted for the GGL/SBA loans servicing asset using the amortization method. Six Months Ended June 30, 2016 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Beginning balance, January 1, $ 1,745 27,148 (1,415 ) Total gains (losses) realized/unrealized: Included in earnings — (278 ) (720 ) Unrealized gains (losses) included in other comprehensive income (120 ) — — Settlements — (4 ) 720 Ending balance, June 30, $ 1,625 26,866 (1,415 ) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — (278 ) (720 ) Three Months Ended June 30, 2016 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Beginning balance, April 1, $ 1,638 26,757 (1,415 ) Total gains (losses) realized/unrealized: Included in earnings — 113 (360 ) Unrealized gains (losses) included in other comprehensive income (13 ) — — Settlements — (4 ) 360 Ending balance, June 30, $ 1,625 26,866 (1,415 ) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — 113 (360 ) The table below provides 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 and are measured at fair value on a recurring basis. June 30, 2017 December 31, 2016 Valuation Technique Significant Unobservable Input Range/Weighted Average Range/Weighted Average Assets and liabilities 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 392 bps 442 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 N/A N/A Discount for lack of liquidity (1) N/A 15% GGL/SBA loans servicing asset Discounted cash flow analysis Discount rate Prepayment speeds 12.01% 6.75% N/A Earnout liability Option pricing methods and Monte Carlo simulation Global One Earnout, as defined in merger agreement, for the five years ending October 1, 2021 $11.8 million - $16.7 million $9.3 million - $14.2 million Visa derivative liability Discounted cash flow analysis 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 1-5 years 1-5 years (1) Represents management's estimate of discount that market participants would require based on the instrument's lack of liquidity. 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. June 30, 2017 December 31, 2016 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Impaired loans * $ — — 11,773 11,773 — — 21,742 21,742 Other real estate — — 12,367 12,367 — — 19,305 19,305 Other assets held for sale — — — — — — 12,083 12,083 * Collateral-dependent impaired loans that were written down to fair value during the period. The following table presents fair value adjustments recognized in earnings for the three months ended June 30, 2017 and 2016 for the assets measured at fair value on a non-recurring basis. Six Months Ended June 30, Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Impaired loans * $ 5,808 1,162 $ 5,776 — Other loans held for sale 3,519 — — — Other real estate 518 3,306 280 2,053 Other assets held for sale 238 6,625 — 5,593 * Collateral-dependent impaired loans that were written down to fair value during the period. The table below provides 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 and are measured at fair value on a non-recurring basis. 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. June 30, 2017 December 31, 2016 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 (2) Estimated selling costs 0% - 60% (46%) 0% - 10% (7%) 0%-52% (25%) 0%-10% (7%) Other loans held for sale Third-party appraised value of collateral less estimated selling costs Discount to appraised value (2) Estimated selling costs N/A N/A Other real estate Third-party appraised value of real estate less estimated selling costs Discount to appraised value (2) Estimated selling costs 0% - 35% (8%) 0% - 10% (7%) 0%-10% (5%) 0%-10% (7%) Other assets held for sale Third-party appraised value less estimated selling costs or BOV Discount to appraised value (2) Estimated selling costs N/A 0%-81% (47%) 0%-10% (7%) (1) The range represents management's estimate of the high and low of the value that would be assigned to a particular input. For assets measured at fair value on a non-recurring basis, the weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability. (2) Synovus also makes adjustments to the values of the assets listed above for reasons including age of the appraisal, information known by management about the property, such as occupancy rates, changes to the physical condition of the property, and other factors. Fair Value of Financial Instruments The following table presents the carrying and fair values of financial instruments at June 30, 2017 and December 31, 2016 . The fair values represent management’s estimates based on various methodologies and assumptions. For financial instruments that are not recorded at fair value on the balance sheet, such as loans held for investment, interest bearing deposits (including brokered deposits), and long-term debt, the fair value amounts should not be taken as an estimate of the amount that would be realized if all such financial instruments were to be settled immediately. The carrying and estimated fair values of financial instruments, as well as the level within the fair value hierarchy, as of June 30, 2017 and December 31, 2016 are as follows: June 30, 2017 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 377,213 377,213 377,213 — — Interest bearing funds with Federal Reserve Bank 468,148 468,148 468,148 — — Interest earning deposits with banks 6,012 6,012 6,012 — — Federal funds sold and securities purchased under resale agreements 46,847 46,847 46,847 — — Trading account assets 3,045 3,045 — 3,045 — Mortgage loans held for sale 61,893 61,893 — 61,893 — Other loans held for sale 127 127 — 127 — Investment securities available for sale 3,827,058 3,827,058 86,275 3,738,856 1,927 Private equity investments 15,698 15,698 — — 15,698 Mutual funds held in rabbi trusts 12,867 12,867 12,867 — — Loans, net of deferred fees and costs 24,430,512 24,191,120 — — 24,191,120 GGL/SBA loans servicing asset 4,297 4,297 — — 4,297 Derivative assets 16,725 16,725 — 16,725 — Financial liabilities Non-interest bearing deposits 7,363,476 7,363,476 — 7,363,476 — Interest bearing deposits 17,855,340 17,852,694 — 17,852,694 — Federal funds purchased, other short-term borrowings and other short-term liabilities 150,379 150,379 150,379 — — Long-term debt 2,107,245 2,155,543 — 2,155,543 — Other liabilities 13,941 13,941 — — 13,941 Derivative liabilities 18,442 18,442 — 13,389 5,053 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

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Summary of Derivative Instruments [Abstract]
Derivative Instruments	Note 9 - 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 June 30, 2017 and December 31, 2016 , 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 periodically reviewing detailed financials. 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 June 30, 2017 and December 31, 2016, there were no cash flow hedges outstanding. The unamortized deferred net loss balance from previously terminated cash flow hedges at December 31, 2016 of $(130) thousand was recognized during the six months ended June 30, 2017 . Fair Value Hedges As of June 30, 2017 and December 31, 2016, there were no fair value hedges outstanding. The unamortized deferred gain balance on all previously terminated fair value hedges at December 31, 2016 of $873 thousand was recognized during the six months ended June 30, 2017 . 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 Sheets. Fair value changes are recorded as a component of non-interest income. As of June 30, 2017 , the notional amount of customer related interest rate derivative financial instruments, including both the customer position and the offsetting position, was $1.49 billion , an increase of $160.4 million compared to December 31, 2016 . 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 $5.1 million and $5.8 million at June 30, 2017 and December 31, 2016 , 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. 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 Synovus' 2016 Form 10-K 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 into 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 June 30, 2017 and December 31, 2016 , Synovus had commitments to fund at a locked interest rate, primarily fixed-rate mortgage loans to customers in the amount of $ 87.8 million and $88.2 million , respectively. Fair value adjustments related to these commitments resulted in a loss of $(416) thousand and a gain of $1.2 million for the six months ended June 30, 2017 and 2016 , respectively, which was recorded as a component of mortgage banking income in the Consolidated Statements of Income. At June 30, 2017 and December 31, 2016 , outstanding commitments to sell primarily fixed-rate mortgage loans amounted to $102.5 million and $126.5 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 a loss of $(1.7) million and $(1.6) million for the six months ended June 30, 2017 and 2016 , 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 June 30, 2017 , collateral totaling $43.3 million of federal funds sold was pledged to the derivative counterparties to comply with collateral requirements. Effective January 3, 2017, the CME amended its rulebook to legally characterize variation margin cash payments for cleared OTC derivatives as settlement rather than as collateral. As a result, in 2017, Synovus began reducing the corresponding derivative asset and liability balances for CME-cleared OTC derivatives to reflect the settlement of those positions via the exchange of variation margin. The impact of derivative instruments on the Consolidated Balance Sheets at June 30, 2017 and December 31, 2016 is presented below. Fair Value of Derivative Assets Fair Value of Derivative Liabilities (in thousands) Location on Consolidated Balance Sheets June 30, 2017 December 31, 2016 Location on Consolidated Balance Sheets June 30, 2017 December 31, 2016 Derivatives not designated as hedging instruments: Interest rate contracts Other assets $ 15,332 17,157 Other liabilities 13,389 17,531 Mortgage derivatives Other assets 1,393 3,466 Other liabilities — — Visa derivative — — Other liabilities 5,053 5,768 Total derivatives not designated as hedging instruments $ 16,725 20,623 18,442 23,299 The pre-tax effect of fair value hedges on the Consolidated Statements of Income for the six and three months ended June 30, 2017 and 2016 is presented below. Location of Gain (Loss) Recognized in Income Gain (Loss) Recognized in Income (in thousands) Six Months Ended June 30, Derivatives not designated as hedging instruments 2017 2016 Interest rate contracts (1) Other non-interest income $ (1 ) 33 Mortgage derivatives (2) Mortgage banking income (2,073 ) (485 ) Total $ (2,074 ) (452 ) Gain (Loss) Recognized in Income (in thousands) Three Months Ended June 30, Derivatives not designated as hedging instruments Location of Gain (Loss) Recognized in Income 2017 2016 Interest rate contracts (1) Other non-interest income $ — 27 Mortgage derivatives (2) Mortgage banking income (289 ) (335 ) Total $ (289 ) (308 ) (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 six months ended June 30, 2017 and 2016 , Synovus reclassified $873 thousand and $950 thousand , respectively, from hedge-related basis adjustment, a component of long-term debt, as a reduction to interest expense. During the six months ended June 30, 2016 , Synovus reclassified $1.3 million from hedge-related basis adjustment, as a reduction to loss on early extinguishment of debt, net. As of June 30, 2017, all deferred gains related to hedging relationships that had been previously terminated had been recognized into earnings.

Net Income Per Common Share

Net Income Per Common Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income Per Common Share	Note 10 - Net Income Per Common Share The following table displays a reconciliation of the information used in calculating basic and diluted earnings per common share for the six and three months ended June 30, 2017 and 2016 . Six Months Ended June 30, Three Months Ended June 30, (in thousands, except per share data) 2017 2016 2017 2016 Basic Net Income Per Common Share: Net income available to common shareholders $ 142,742 107,870 $ 73,444 57,898 Weighted average common shares outstanding 122,251 126,164 122,203 125,100 Net income per common share, basic $ 1.17 0.85 $ 0.60 0.46 Diluted Net Income Per Common Share: Net income available to common shareholders $ 142,742 107,870 $ 73,444 57,898 Weighted average common shares outstanding 122,251 126,164 122,203 125,100 Potentially dilutive shares from outstanding equity-based awards 792 614 824 599 Weighted average diluted common shares 123,043 126,778 123,027 125,699 Net income per common share, diluted $ 1.16 0.85 $ 0.60 0.46 Basic net income per common share is computed by dividing net income by the average common shares outstanding for the period. Diluted net income per common share reflects the dilution that could occur if securities or other contracts to issue common stock were exercised or converted. The dilutive effect of outstanding options and restricted share units is reflected in diluted net income per common share, unless the impact is anti-dilutive, by application of the treasury stock method. As of June 30, 2017 and 2016 , there were 2.2 million and 2.5 million , respectively, potentially dilutive shares related to the Warrant and stock options to purchase shares of common stock that were outstanding during 2017 and 2016 , but were not included in the computation of diluted net income per common share because the effect would have been anti-dilutive.

Share-based Compensation

Share-based Compensation	6 Months Ended
	Jun. 30, 2017
Share-based Compensation [Abstract]
Share-based Compensation	Note 11 - Share-based Compensation General Description of Share-based Plans Synovus has a long-term incentive plan under which the Compensation Committee of the Board of Directors has the authority to grant share-based awards to Synovus employees. At June 30, 2017 , Synovus had a total of 5.7 million shares of its authorized but unissued common stock reserved for future grants under the 2013 Omnibus Plan. The 2013 Omnibus Plan authorizes 8.6 million common share equivalents available for grant, where grants of options count as one share equivalent and grants of full value awards (e.g., restricted share units, market restricted share units, and performance share units) count as two share equivalents. Any restricted share units that are forfeited and options that expire unexercised will again become available for issuance under the Plan. The Plan permits grants of share-based compensation including stock options, restricted share units, market restricted share units, and performance share units. The grants generally include vesting periods ranging from three to five years and contractual terms of ten years. Stock options are granted at exercise prices which equal the fair value of a share of common stock on the grant-date. Market restricted share units and performance share units are granted at target and are compared annually to required market and performance metrics to determine final 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. Share-based Compensation Expense Total share-based compensation expense was $6.8 million and $3.5 million for the six and three months ended June 30, 2017 , respectively, and $6.8 million and $3.5 million for the six and three months ended June 30, 2016 , respectively. Stock Options No stock option grants were made during the six months ended June 30, 2017 . At June 30, 2017 , there were 826 thousand outstanding stock options to purchase shares of common stock with a weighted average exercise price of $17.81 per share. Restricted Share Units, Performance Share Units, and Market Restricted Share Units During the six months ended June 30, 2017 , Synovus awarded 230 thousand restricted share units that have a service-based vesting period of three years and awarded 73 thousand performance share units that vest upon service and performance conditions. Synovus also granted 73 thousand market restricted share units during the six months ended June 30, 2017 . The weighted average grant-date fair value of the awarded restricted share units, performance share units and market restricted share units was $41.93 per share. Market restricted share units and performance share units are granted at target and are compared annually to required market and performance metrics. The performance share units vest upon meeting certain service and performance conditions. Return on average assets (ROAA) performance 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 target based on Synovus' three-year weighted average ROAA (as defined). The market restricted share units have a three -year service-based vesting component as well as a total shareholder return multiplier. The number of market restricted share units that will ultimately vest ranges from 75% to 125% of target based on Synovus' total shareholder return. At June 30, 2017 , including dividend equivalents granted, there were 983 thousand restricted share units, performance share units and market restricted share units outstanding with a weighted average grant-date fair value of $32.82 per share.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 12 - 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 allowance for credit losses associated with unfunded commitments and letters of credit is a component of the unfunded commitments reserve recorded within other liabilities on the Consolidated Balance Sheets. Additionally, unearned fees relating to letters of credit are recorded within other liabilities on the Consolidated Balance Sheets. These amounts are not material to Synovus' Consolidated Balance Sheets. Unfunded lending commitments and letters of credit at June 30, 2017 and December 31, 2016 are presented below. (in thousands) June 30, 2017 December 31, 2016 Letters of credit* $ 155,542 150,948 Commitments to fund commercial real estate, construction, and land development loans 1,427,947 1,394,162 Unused credit card lines 1,152,324 1,103,431 Commitments under home equity lines of credit 1,126,766 1,096,052 Commitments to fund commercial and industrial loans 5,039,168 4,792,834 Other loan commitments 308,386 307,772 Total unfunded lending commitments and letters of credit $ 9,210,133 8,845,199 * Represent the contractual amount net of risk participations of approximately $61 million and $83 million at June 30, 2017 and December 31, 2016, respectively.

Legal Proceedings

Legal Proceedings	6 Months Ended
	Jun. 30, 2017
Legal Proceedings Disclosure [Abstract]
Legal Proceedings	Note 13 - 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 June 30, 2017 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.

Agreement with World's Foremost

Agreement with World's Foremost Bank and Capital One Bank	6 Months Ended
	Jun. 30, 2017
Assumptions for Deposits [Abstract]
Agreement with World's Foremost Bank and Capital One Bank	Note 14 - Agreement with World's Foremost Bank and Capital One Bank On April 17, 2017, Synovus Bank entered into a definitive agreement to acquire certain card assets and assume certain liabilities of World's Foremost Bank (WFB), a wholly-owned subsidiary of Cabela's Incorporated. Immediately following the closing of this transaction, Synovus will sell the credit card assets and related liabilities to Capital One Bank (USA), National Association, a subsidiary of Capital One Financial Corporation (Capital One), while retaining the brokered time deposits portfolio. As of June 30, 2017 the WFB brokered deposits portfolio had a carrying value of approximately $1.1 billion . Pursuant to the terms of the agreement, Synovus will receive $75 million in consideration from Cabela's and Capital One upon closing. Closing of the transaction is subject to customary regulatory approvals and the satisfaction of other closing conditions. The transaction will be accounted for as an assumption of liabilities pursuant to the asset acquisition model and the earning of fees for services performed. The $75 million in consideration will be recorded as a transaction fee, to be recognized upon closing of the transaction as no continuing involvement or contingencies with respect to the sale of the credit card assets and related liabilities will exist. If the transaction between Synovus and Capital One referred to above does not occur immediately after the transaction between Synovus and WFB, then the transaction between Synovus and WFB will be rescinded, including repayment of any cash amounts paid and return of any assets and liabilities transferred, such that Cabela’s, WFB, Capital One and Synovus will be in the same position as if the transaction had never occurred. Additionally, the deposit liabilities acquired by Synovus will be recorded at fair value determined in accordance with the Brokered CD Curve Discount Methodology, as defined in the agreement. In the event that the book value of the deposits is less than the fair value of the deposits, Capital One will provide a cash payment to Synovus to compensate Synovus for the difference; however, Synovus is not required to make any payment if the fair value of the deposits is less than the book value. At June 30, 2017 the deposit portfolio had a weighted average cost of funds of approximately 1.82% , maturities ranging from 2017 through 2023, and a weighted average maturity of approximately 2.79 years. For additional information regarding this transaction, please refer to Synovus' Current Report on Form 8-K filed with the SEC on April 17, 2017.

Significant Accounting Polici23

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the instructions to the SEC Form 10-Q and Article 10 of Regulation S-X; therefore, they do not include all information and footnotes necessary for a fair presentation of financial position, results of operations, comprehensive income, and cash flows in conformity with GAAP. All adjustments consisting of normally recurring accruals that, in the opinion of management, are necessary for a fair presentation of the consolidated financial position and results of operations for the periods covered by this Report have been included. The accompanying unaudited interim consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes appearing in Synovus' 2016 Form 10-K. There have been no significant changes to the accounting policies as disclosed in Synovus' 2016 Form 10-K. In preparing the unaudited interim consolidated financial statements in accordance with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the respective consolidated balance sheets and the reported amounts of revenues and expenses for the periods presented. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, the fair value of investment securities, the fair value of private equity investments, and contingent liabilities related to legal matters.
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.
Recently Adopted Accounting Standards Updates	During 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 simplifies various 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. This accounting standard update includes a requirement to record all tax effects associated with share-based compensation through the income statement. Prior to 2017, tax benefits in excess of compensation cost (“windfalls”) and tax deficiencies (“shortfalls”) were recorded in equity. During the six and three months ended June 30, 2017 , Synovus recognized $4.5 million and $378 thousand , respectively, of income tax benefits from excess tax benefits that occurred during the six months ended June 30, 2017 from the vesting of restricted share units and exercise of stock options. As of January 1, 2017, Synovus had no previously unrecognized excess tax benefits. Additionally, beginning January 1, 2017, Synovus modified the denominator in the diluted earnings per common share calculation under the treasury stock method to exclude future excess tax benefits as part of the assumed proceeds. Synovus elected to retain its existing accounting policy election to estimate award forfeitures. During 2015, the FASB issued ASU 2015-17, Income Taxes: Balance Sheet Classification of Deferred Taxes , which became effective January 1, 2017. ASU 2015-17 requires that deferred income tax liabilities and assets be classified as noncurrent in the statement of financial position instead of separating deferred taxes into current and noncurrent amounts. Also, valuation allowances will no longer be classified between current and noncurrent because these allowances will be required to be classified as noncurrent under the new standard. This ASU only impacts classification in the balance sheet, and has no impact on required deferred tax footnote disclosures (i.e., required presentation of “gross” deferred tax assets and “gross” deferred tax liabilities). The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by this ASU. There is no impact to our balance sheet as a result of this standard because Synovus has not historically distinguished deferred taxes on the balance sheet as current vs. non-current.
Reclassifications	Prior periods' consolidated financial statements are reclassified whenever necessary to conform to the current periods' presentation.

Acquisition (Tables)

Acquisition (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Schedule of Business Acquisition	Global One October 1, 2016 (in thousands) Fair Value Assets acquired: Cash and due from banks $ 9,554 Commercial and industrial loans (1) 357,307 Goodwill (2) 32,661 Other intangible assets 12,500 Other assets 3,904 Total assets acquired $ 415,926 Liabilities assumed: Notes payable (3) $ 358,560 Contingent consideration 12,234 Deferred tax liability, net 3,229 Other liabilities 11,903 Total liabilities assumed $ 385,926 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 .

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 and December 31, 2016 are summarized below. June 30, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 83,493 — (360 ) 83,133 U.S. Government agency securities 12,088 223 — 12,311 Mortgage-backed securities issued by U.S. Government agencies 132,710 640 (1,125 ) 132,225 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,881,234 6,169 (30,998 ) 2,856,405 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 734,804 84 (12,468 ) 722,420 State and municipal securities 290 — — 290 Corporate debt and other securities 20,279 205 (210 ) 20,274 Total investment securities available for sale $ 3,864,898 7,321 (45,161 ) 3,827,058 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 Corporate debt and other securities 20,247 — (407 ) 19,840 Total investment securities available for sale $ 3,768,618 11,114 (61,537 ) 3,718,195
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 June 30, 2017 and December 31, 2016 are presented below. June 30, 2017 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 $ 64,342 360 — — 64,342 360 Mortgage-backed securities issued by U.S. Government agencies 95,492 1,125 — — 95,492 1,125 Mortgage-backed securities issued by U.S. Government sponsored enterprises 2,161,449 30,998 — — 2,161,449 30,998 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 668,342 11,678 23,212 790 691,554 12,468 Corporate debt and other securities — — 5,069 210 5,069 210 Total $ 2,989,625 44,161 28,281 1,000 3,017,906 45,161 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 Corporate debt and other securities 14,952 48 4,888 359 19,840 407 Total $ 3,012,769 60,156 33,315 1,381 3,046,084 61,537
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 June 30, 2017 (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 $ 18,791 64,702 — — — 83,493 U.S. Government agency securities 1,000 5,612 5,476 — — 12,088 Mortgage-backed securities issued by U.S. Government agencies — — 34,868 97,842 — 132,710 Mortgage-backed securities issued by U.S. Government sponsored enterprises 47 2,262 535,035 2,343,890 — 2,881,234 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 22,173 712,631 — 734,804 State and municipal securities 110 180 — — — 290 Corporate debt and other securities — — 15,000 2,000 3,279 20,279 Total amortized cost $ 19,948 72,756 612,552 3,156,363 3,279 3,864,898 Fair Value U.S. Treasury securities $ 18,791 64,342 — — — 83,133 U.S. Government agency securities 1,004 5,682 5,625 — — 12,311 Mortgage-backed securities issued by U.S. Government agencies — — 35,007 97,218 — 132,225 Mortgage-backed securities issued by U.S. Government sponsored enterprises 48 2,390 529,968 2,323,999 — 2,856,405 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 21,950 700,470 — 722,420 State and municipal securities 110 180 — — — 290 Corporate debt and other securities — — 15,205 1,927 3,142 20,274 Total fair value $ 19,953 72,594 607,755 3,123,614 3,142 3,827,058
Schedule of Activity for Available-for-Sale Securities	Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the three months ended June 30, 2017 and 2016 are presented below. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale. Six Months Ended June 30, Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Proceeds from sales of investment securities available for sale $ 338,381 243,609 $ 55,752 — Gross realized gains on sales 7,942 954 239 — Gross realized losses on sales (275 ) (887 ) (240 ) — Investment securities gains, net $ 7,667 67 $ (1 ) —

Restructuring Charges (Tables)

Restructuring Charges (Tables)	6 Months Ended
	Jun. 30, 2017
Restructuring Charges [Abstract]
Schedule of Restructuring and Related Costs	The following tables present aggregate activity within the accrual for restructuring charges for the six and three months ended June 30, 2017 and 2016 : (in thousands) Severance Charges Lease Termination Charges Total Balance at December 31, 2016 $ 81 3,968 4,049 Accruals for voluntary and involuntary termination benefits 6,453 — 6,453 Payments (2,803 ) (438 ) (3,241 ) Balance at June 30, 2017 $ 3,731 3,530 7,261 Balance at April 1, 2017 6,315 3,689 10,004 Payments (2,584 ) (159 ) (2,743 ) Balance at June 30, 2017 $ 3,731 3,530 7,261 (in thousands) Severance Charges Lease Termination Charges Total Balance at December 31, 2015 $ 1,930 4,687 6,617 Accruals for lease terminations — 31 31 Payments (1,337 ) (343 ) (1,680 ) Balance at June 30, 2016 $ 593 4,375 4,968 Balance at April 1, 2016 1,533 4,545 6,078 Accruals for lease terminations — (13 ) (13 ) Payments (940 ) (157 ) (1,097 ) Balance at June 30, 2016 $ 593 4,375 4,968 For the six and three months ended June 30, 2017 and 2016 , total restructuring charges consist of the following components: Six Months Ended June 30, Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Severance charges $ 6,453 — $ — — Lease termination charges — 31 — (13 ) Asset impairment charges — 6,866 — 5,821 Loss (gain) on sale of assets held for sale, net (4 ) 13 (4 ) 13 Other charges 75 71 17 20 Total restructuring charges, net $ 6,524 6,981 $ 13 5,841

Loans and Allowance for Loan 27

Loans and Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2017
Loans and Allowance for Loan Losses [Abstract]
Schedule of Current, Accruing Past Due, and Nonaccrual Loans	The following is a summary of current, accruing past due, and non-accrual loans by portfolio class as of June 30, 2017 and December 31, 2016 . Current, Accruing Past Due, and Non-accrual Loans June 30, 2017 (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 $ 6,028,397 3,482 72 3,554 3,712 6,035,663 1-4 family properties 818,327 8,657 101 8,758 8,535 835,620 Land and development 529,967 1,964 126 2,090 10,931 542,988 Total commercial real estate 7,376,691 14,103 299 14,402 23,178 7,414,271 Commercial, financial and agricultural 6,915,588 14,670 765 15,435 69,550 7,000,573 Owner-occupied 4,715,325 9,291 801 10,092 24,918 4,750,335 Total commercial and industrial 11,630,913 23,961 1,566 25,527 94,468 11,750,908 Home equity lines 1,533,528 8,286 705 8,991 20,648 1,563,167 Consumer mortgages 2,444,866 7,141 623 7,764 18,035 2,470,665 Credit cards 223,092 1,550 1,258 2,808 — 225,900 Other consumer loans 1,021,355 7,197 99 7,296 2,988 1,031,639 Total consumer 5,222,841 24,174 2,685 26,859 41,671 5,291,371 Total loans $ 24,230,445 62,238 4,550 66,788 159,317 24,456,550 (1 ) 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 $ 5,861,198 2,795 — 2,795 5,268 5,869,261 1-4 family properties 873,231 4,801 161 4,962 9,114 887,307 Land and development 591,732 1,441 — 1,441 16,233 609,406 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 consumer loans 809,419 5,771 39 5,810 2,954 818,183 Total consumer 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 (2 ) (1) Total before net deferred fees and costs of $26.0 million . (2) Total before net deferred fees and costs of $26.0 million .
Loan Portfolio Credit Exposure	In the following tables, consumer 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 consumer 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 any associated senior liens with other financial institutions. Loan Portfolio Credit Exposure by Risk Grade June 30, 2017 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,952,286 61,451 21,926 — — 6,035,663 1-4 family properties 788,665 24,169 22,559 227 — 835,620 Land and development 477,974 40,576 21,227 3,211 — 542,988 Total commercial real estate 7,218,925 126,196 65,712 3,438 — 7,414,271 Commercial, financial and agricultural 6,710,038 124,412 160,354 5,629 140 (3) 7,000,573 Owner-occupied 4,590,414 52,101 106,410 1,410 — 4,750,335 Total commercial and industrial 11,300,452 176,513 266,764 7,039 140 11,750,908 Home equity lines 1,535,583 — 24,812 373 2,399 (3) 1,563,167 Consumer mortgages 2,450,658 — 19,528 313 166 (3) 2,470,665 Credit cards 224,643 — 445 — 812 (4) 225,900 Other consumer loans 1,028,493 — 2,808 299 39 (3) 1,031,639 Total consumer 5,239,377 — 47,593 985 3,416 5,291,371 Total loans $ 23,758,754 302,709 380,069 11,462 3,556 24,456,550 (5 ) December 31, 2016 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss Total Investment properties $ 5,794,626 43,336 31,299 — — 5,869,261 1-4 family properties 826,311 33,928 26,790 278 — 887,307 Land and development 514,853 60,205 27,361 6,987 — 609,406 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 consumer loans 814,844 — 3,233 42 64 (3) 818,183 Total consumer 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 (6 ) (1) Includes $235.8 million and $256.6 million of Substandard accruing loans at June 30, 2017 and December 31, 2016 , 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 $26.0 million .
Schedule of Allowances for Loan Losses and Recorded Investment in Loans	The following table details the changes in the allowance for loan losses by loan segment for the six and three months ended June 30, 2017 . Allowance for Loan Losses and Recorded Investment in Loans As of and For The Six Months Ended June 30, 2017 (in thousands) Commercial Real Estate Commercial & Industrial Retail Total Allowance for loan losses: Beginning balance $ 81,816 125,778 44,164 251,758 Charge-offs (3,207 ) (19,535 ) (9,656 ) (32,398 ) Recoveries 3,648 3,282 2,871 9,801 Provision for loan losses (4,730 ) 13,912 9,752 18,934 Ending balance (1) $ 77,527 123,437 47,131 248,095 Ending balance: individually evaluated for impairment 4,386 7,226 1,038 12,650 Ending balance: collectively evaluated for impairment $ 73,141 116,211 46,093 235,445 Loans: Ending balance: total loans (1)(2) $ 7,414,271 11,750,908 5,291,371 24,456,550 Ending balance: individually evaluated for impairment 73,638 122,889 31,688 228,215 Ending balance: collectively evaluated for impairment $ 7,340,633 11,628,019 5,259,683 24,228,335 As of and For The Six Months Ended June 30, 2016 (in thousands) Commercial Real Estate Commercial & Industrial Retail Total Allowance for loan losses: Beginning balance $ 87,133 122,989 42,374 252,496 Charge-offs (9,277 ) (10,661 ) (7,148 ) (27,086 ) Recoveries 6,690 4,342 2,564 13,596 Provision for loan losses (5,187 ) 12,963 8,294 16,070 Ending balance (1) $ 79,359 129,633 46,084 255,076 Ending balance: individually evaluated for impairment 12,515 14,221 1,691 28,427 Ending balance: collectively evaluated for impairment $ 66,844 115,412 44,393 226,649 Loans: Ending balance: total loans (1)(3) $ 7,507,695 10,955,430 4,625,410 23,088,535 Ending balance: individually evaluated for impairment 112,954 119,805 37,788 270,547 Ending balance: collectively evaluated for impairment $ 7,394,741 10,835,625 4,587,622 22,817,988 (1) As of and for the six months ended June 30, 2017 and 2016, there were no purchased credit-impaired loans and no allowance for loan losses for purchased credit-impaired loans. (2) Total before net deferred fees and costs of $26.0 million . (3) Total before net deferred fees and costs of $27.6 million . Allowance for Loan Losses and Recorded Investment in Loans As Of and For The Three Months Ended June 30, 2017 (in thousands) Commercial Real Estate Commercial & Industrial Consumer Total Allowance for loan losses: Beginning balance $ 78,314 127,096 48,104 253,514 Charge-offs (1,299 ) (12,642 ) (5,722 ) (19,663 ) Recoveries 759 1,458 1,767 3,984 Provision for loan losses (247 ) 7,525 2,982 10,260 Ending balance (1) $ 77,527 123,437 47,131 248,095 Ending balance: individually evaluated for impairment 4,386 7,226 1,038 12,650 Ending balance: collectively evaluated for impairment $ 73,141 116,211 46,093 235,445 Loans: Ending balance: total loans (1)(2) $ 7,414,271 11,750,908 5,291,371 24,456,550 Ending balance: individually evaluated for impairment 73,638 122,889 31,688 228,215 Ending balance: collectively evaluated for impairment $ 7,340,633 11,628,019 5,259,683 24,228,335 As Of and For The Three Months Ended June 30, 2016 (in thousands) Commercial Real Estate Commercial & Industrial Consumer Total Allowance for loan losses: Beginning balance $ 84,557 124,878 45,081 254,516 Charge-offs (7,455 ) (5,136 ) (3,180 ) (15,771 ) Recoveries 5,397 3,078 1,163 9,638 Provision for loan losses (3,140 ) 6,813 3,020 6,693 Ending balance (1) $ 79,359 129,633 46,084 255,076 Ending balance: individually evaluated for impairment 12,515 14,221 1,691 28,427 Ending balance: collectively evaluated for impairment $ 66,844 115,412 44,393 226,649 Loans: Ending balance: total loans (1)(3) $ 7,507,695 10,955,430 4,625,410 23,088,535 Ending balance: individually evaluated for impairment 112,954 119,805 37,788 270,547 Ending balance: collectively evaluated for impairment $ 7,394,741 10,835,625 4,587,622 22,817,988 (1) For the three months ended June 30, 2017 and 2016, there were no purchased credit-impaired loans and no allowance for loan losses for purchased credit-impaired loans. (2) Total before net deferred fees and costs of $26.0 million . (3) Total before net deferred fees and costs of $27.6 million .
Schedule of Impaired Loans	The tables below summarize impaired loans (including accruing TDRs) as of June 30, 2017 and December 31, 2016 . Impaired Loans (including accruing TDRs) June 30, 2017 Six Months Ended June 30, 2017 Three Months Ended June 30, 2017 (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded Investment properties $ — — — 246 — — — 1-4 family properties 253 2,582 — 380 — 257 — Land and development 2,226 5,539 — 2,193 — 2,246 — Total commercial real estate 2,479 8,121 — 2,819 — 2,503 — Commercial, financial and agricultural 26,913 33,098 — 22,956 — 26,202 — Owner-occupied 13,824 20,250 — 10,383 — 11,910 — Total commercial and industrial 40,737 53,348 — 33,339 — 38,112 — Home equity lines 1,064 1,064 — 1,060 — 1,064 — Consumer mortgages 744 941 — 744 — 744 — Credit cards — — — — — — — Other consumer loans — — — — — — — Total consumer 1,808 2,005 — 1,804 — 1,808 — Total impaired loans with no related allowance recorded $ 45,024 63,474 — 37,962 — 42,423 — With allowance recorded Investment properties $ 29,168 29,168 1,175 29,575 597 29,264 306 1-4 family properties 15,879 15,893 448 16,995 386 16,133 250 Land and development 26,112 26,168 2,763 27,381 299 26,366 126 Total commercial real estate 71,159 71,229 4,386 73,951 1,282 71,763 682 Commercial, financial and agricultural 46,569 46,887 5,524 46,455 787 48,959 436 Owner-occupied 35,583 35,594 1,702 42,814 674 38,318 336 Total commercial and industrial 82,152 82,481 7,226 89,269 1,461 87,277 772 Home equity lines 7,135 7,135 171 8,197 465 7,680 229 Consumer mortgages 18,762 18,762 598 19,720 183 19,009 92 Credit cards — — — — — — — Other consumer loans 3,983 3,984 269 4,692 132 4,380 59 Total consumer 29,880 29,881 1,038 32,609 780 31,069 380 Total impaired loans with allowance recorded $ 183,191 183,591 12,650 195,829 3,523 190,109 1,834 Total impaired loans Investment properties $ 29,168 29,168 1,175 29,821 597 29,264 306 1-4 family properties 16,132 18,475 448 17,375 386 16,390 250 Land and development 28,338 31,707 2,763 29,574 299 28,612 126 Total commercial real estate 73,638 79,350 4,386 76,770 1,282 74,266 682 Commercial, financial and agricultural 73,482 79,985 5,524 69,411 787 75,161 436 Owner-occupied 49,407 55,844 1,702 53,197 674 50,228 336 Total commercial and industrial 122,889 135,829 7,226 122,608 1,461 125,389 772 Home equity lines 8,199 8,199 171 9,257 465 8,744 229 Consumer mortgages 19,506 19,703 598 20,464 183 19,753 92 Credit cards — — — — — — — Other consumer loans 3,983 3,984 269 4,692 132 4,380 59 Total consumer 31,688 31,886 1,038 34,413 780 32,877 380 Total impaired loans $ 228,215 247,065 12,650 233,791 3,523 232,532 1,834 Impaired Loans (including accruing TDRs) December 31, 2016 Year Ended 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 — 2,013 — 1-4 family properties 643 2,939 — 1,021 — Land and development 2,099 7,243 — 6,769 — 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 consumer loans — — — — — Total consumer 1,795 1,865 — 1,915 — Total impaired loans with no related allowance recorded $ 28,751 40,794 — 26,433 — With allowance recorded Investment properties $ 31,489 31,489 2,044 42,659 1,436 1-4 family properties 23,642 23,649 769 39,864 855 Land and development 32,789 32,788 5,103 25,568 995 Total commercial real estate 87,920 87,926 7,916 108,091 3,286 Commercial, financial and agricultural 43,386 45,913 5,687 51,968 1,215 Owner-occupied 53,708 53,942 2,697 52,300 1,946 Total commercial and industrial 97,094 99,855 8,384 104,268 3,161 Home equity lines 9,638 9,638 971 9,668 432 Consumer mortgages 20,953 20,953 673 20,993 1,014 Credit cards — — — — — Other consumer loans 5,140 5,140 167 5,062 303 Total consumer 35,731 35,731 1,811 35,723 1,749 Total impaired loans with allowance recorded $ 220,745 223,512 18,111 248,082 8,196 Total impaired loans Investment properties $ 32,237 32,282 2,044 44,672 1,436 1-4 family properties 24,285 26,588 769 40,885 855 Land and development 34,888 40,031 5,103 32,337 995 Total commercial real estate 91,410 98,901 7,916 117,894 3,286 Commercial, financial and agricultural 61,344 66,490 5,687 58,289 1,215 Owner-occupied 59,216 61,319 2,697 60,694 1,946 Total commercial and industrial 120,560 127,809 8,384 118,983 3,161 Home equity lines 10,689 10,689 971 10,713 432 Consumer mortgages 21,697 21,767 673 21,863 1,014 Credit cards — — — — — Other consumer loans 5,140 5,140 167 5,062 303 Total consumer 37,526 37,596 1,811 37,638 1,749 Total impaired loans $ 249,496 264,306 18,111 274,515 8,196
Troubled Debt Restructurings	The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the six and three months ended June 30, 2017 and 2016 that were reported as accruing or non-accruing TDRs. TDRs by Concession Type Six Months Ended June 30, 2017 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties — $ — — — — 1-4 family properties 16 — 2,089 513 2,602 Land acquisition 1 — — 135 135 Total commercial real estate 17 — 2,089 648 2,737 Commercial, financial and agricultural 28 — 5,760 6,279 12,039 Owner-occupied 1 — — 22 22 Total commercial and industrial 29 — 5,760 6,301 12,061 Home equity lines — — — — — Consumer mortgages 1 — — 9 9 Credit cards — — — — — Other retail loans 8 — — 570 570 Total retail 9 — — 579 579 Total TDRs 55 $ — 7,849 7,528 15,377 (1 ) Three Months Ended June 30, 2017 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties — $ — — — — 1-4 family properties 8 — 478 196 674 Land and development 1 — — 135 135 Total commercial real estate 9 — 478 331 809 Commercial, financial and agricultural 10 — 1,895 740 2,635 Owner-occupied 1 — — 22 22 Total commercial and industrial 11 — 1,895 762 2,657 Home equity lines — — — — — Consumer mortgages 1 — — 9 9 Credit cards — — — — — Other consumer loans 5 — — 295 295 Total consumer 6 — — 304 304 Total TDRs 26 $ — 2,373 1,397 3,770 (1 ) (1) No net charge-offs were recorded during the six and three months ended June 30, 2017 upon restructuring of these loans. TDRs by Concession Type Six Months Ended June 30, 2016 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties 3 $ — 1,826 148 1,974 1-4 family properties 19 — 3,490 1,164 4,654 Land acquisition 11 — — 1,269 1,269 Total commercial real estate 33 — 5,316 2,581 7,897 Commercial, financial and agricultural 45 — 13,948 4,845 18,793 Owner-occupied 6 — 2,667 550 3,217 Total commercial and industrial 51 — 16,615 5,395 22,010 Home equity lines 3 — 224 — 224 Consumer mortgages 6 — 354 51 405 Credit cards — — — — — Other retail loans 17 — 324 1,534 1,858 Total retail 26 — 902 1,585 2,487 Total TDRs 110 $ — 22,833 9,561 32,394 (2 ) Three Months Ended June 30, 2016 (in thousands, except contract data) Number of Contracts Principal Forgiveness Below Market Interest Rate Term Extensions and/or Other Concessions Total Investment properties 1 $ — 1,389 — 1,389 1-4 family properties 12 — 3,095 324 3,419 Land and development 5 — — 734 734 Total commercial real estate 18 — 4,484 1,058 5,542 Commercial, financial and agricultural 15 — 1,934 1,458 3,392 Owner-occupied 2 — 1,132 102 1,234 Total commercial and industrial 17 — 3,066 1,560 4,626 Home equity lines 1 — 28 — 28 Consumer mortgages 3 — 200 51 251 Credit cards — — — — — Other consumer loans 10 — 94 1,449 1,543 Total consumer 14 — 322 1,500 1,822 Total TDRs 49 $ — 7,872 4,118 11,990 (2 ) (2) No net charge-offs were recorded during the six and three months ended June 30, 2016 upon restructuring of these loans.

Other Comprehensive Income (L28

Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)	The following tables illustrate activity within the balances in accumulated other comprehensive income (loss) by component for the six and three months ended June 30, 2017 and 2016 . 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, 2016 $ (12,217 ) (44,324 ) 882 (55,659 ) Other comprehensive income before reclassifications — 12,453 — 12,453 Amounts reclassified from accumulated other comprehensive income (loss) 80 (4,715 ) (24 ) (4,659 ) Net current period other comprehensive income 80 7,738 (24 ) 7,794 Balance as of June 30, 2017 $ (12,137 ) (36,586 ) 858 (47,865 ) Balance as of April 1, 2017 $ (12,177 ) (43,444 ) 870 (54,751 ) Other comprehensive income before reclassifications — 6,857 — 6,857 Amounts reclassified from accumulated other comprehensive income (loss) 40 1 (12 ) 29 Net current period other comprehensive income 40 6,858 (12 ) 6,886 Balance as of June 30, 2017 $ (12,137 ) (36,586 ) 858 (47,865 ) 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, 2015 $ (12,504 ) (18,222 ) 907 (29,819 ) Other comprehensive income before reclassifications — 40,722 — 40,722 Amounts reclassified from accumulated other comprehensive income (loss) 207 (41 ) (64 ) 102 Net current period other comprehensive income 207 40,681 (64 ) 40,824 Balance as of June 30, 2016 $ (12,297 ) 22,459 843 11,005 Balance as of April 1, 2016 $ (12,336 ) 10,747 849 (740 ) Other comprehensive income (loss) before reclassifications — 11,712 — 11,712 Amounts reclassified from accumulated other comprehensive income (loss) 39 — (6 ) 33 Net current period other comprehensive income (loss) 39 11,712 (6 ) 11,745 Balance as of June 30, 2016 $ (12,297 ) 22,459 843 11,005
Schedule of Reclassifications out of Accumulated Other Comprehensive Income (Loss)	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 Six Months Ended June 30, 2017 2016 Net unrealized gains (losses) on cash flow hedges: Amortization of deferred losses $ (130 ) (140 ) Interest expense Amortization of deferred losses — (197 ) Loss on early extinguishment of debt, net 50 130 Income tax (expense) benefit $ (80 ) (207 ) Reclassifications, net of income taxes Net unrealized gains on investment securities available for sale: Realized gain on sale of securities $ 7,667 67 Investment securities gains, net (2,952 ) (26 ) Income tax (expense) benefit $ 4,715 41 Reclassifications, net of income taxes Post-retirement unfunded health benefit: Amortization of actuarial gains $ 40 104 Salaries and other personnel expense (16 ) (40 ) Income tax (expense) benefit $ 24 64 Reclassifications, net of income taxes 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 Three Months Ended June 30, 2017 2016 Net unrealized gains (losses) on cash flow hedges: Amortization of deferred losses $ (65 ) (64 ) Interest expense 25 25 Income tax (expense) benefit $ (40 ) (39 ) Reclassifications, net of income taxes Net unrealized gains on investment securities available for sale: Realized net (loss)gain on sale of securities $ (1 ) — Investment securities gains, net — — Income tax (expense) benefit $ (1 ) — Reclassifications, net of income taxes Post-retirement unfunded health benefit: Amortization of actuarial gains $ 20 10 Salaries and other personnel expense (8 ) (4 ) Income tax (expense) benefit $ 12 6 Reclassifications, net of income taxes

Fair Value Accounting (Tables)

Fair Value Accounting (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 and December 31, 2016 , 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 during the six and three months ended June 30, 2017 and year ended December 31, 2016 were inconsequential. June 30, 2017 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: U.S. Government agency securities — 1,587 — 1,587 Collateralized mortgage obligations issued by U.S. Government sponsored enterprises — 386 — 386 State and municipal securities — 1,072 — 1,072 Total trading securities $ — 3,045 — 3,045 Mortgage loans held for sale — 61,893 — 61,893 Investment securities available for sale: U.S. Treasury securities 83,133 — — 83,133 U.S. Government agency securities — 12,311 — 12,311 Mortgage-backed securities issued by U.S. Government agencies — 132,225 — 132,225 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 2,856,405 — 2,856,405 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 722,420 — 722,420 State and municipal securities — 290 — 290 Corporate debt and other securities (1) 3,142 15,205 1,927 20,274 Total investment securities available for sale $ 86,275 3,738,856 1,927 3,827,058 Private equity investments — 15,698 15,698 Mutual funds held in rabbi trusts 12,867 — — 12,867 GGL/SBA loans servicing asset — — 4,297 4,297 Derivative assets: Interest rate contracts — 15,332 — 15,332 Mortgage derivatives (2) — 1,393 — 1,393 Total derivative assets $ — 16,725 — 16,725 Liabilities Earnout liability (3) — — 13,941 13,941 Derivative liabilities: Interest rate contracts — 13,389 — 13,389 Visa derivative — — 5,053 5,053 Total derivative liabilities $ — 13,389 5,053 18,442 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 Corporate debt and other securities (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 Earnout liability (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 (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) Earnout liability consists of contingent consideration obligation related to the 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 are recorded as a component of mortgage banking income in the Consolidated Statements of Income. An immaterial portion of these changes in fair value was attributable to changes in instrument-specific credit risk. Changes in Fair Value Included in Net Income For the Six Months Ended June 30, For the Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Mortgage loans held for sale $ 954 1,850 $ (249 ) 878 Mortgage Loans Held for Sale (in thousands) As of June 30, 2017 As of December 31, 2016 Fair value $ 61,893 51,545 Unpaid principal balance 60,508 51,114 Fair value less aggregate unpaid principal balance $ 1,385 431
Changes in Level 3 Fair Value Measurements	The table below includes a roll-forward of the amounts on the Consolidated Balance Sheets for the six and three months ended June 30, 2017 and 2016 (including the change in fair value), for financial instruments of a material nature that are classified by Synovus within Level 3 of the fair value hierarchy and are measured at fair value on a recurring basis. Transfers between fair value levels are recognized at the end of the reporting period in which the associated changes in inputs occur. During the six and three months ended June 30, 2017 and 2016 , Synovus did not have any transfers between levels in the fair value hierarchy. Six Months Ended June 30, 2017 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Earnout Liability (1) GGL / SBA Loans Servicing Asset (2) Beginning balance, January 1, $ 1,796 25,493 (5,768 ) (14,000 ) — Total gains (losses) realized/unrealized: Included in earnings — (3,166 ) — (1,707 ) (694 ) Unrealized gains (losses) included in other comprehensive income 131 — — — — Additions — — — — 539 Sales and settlements — (6,629 ) 715 — — Transfer from amortization method to fair value — — — — 4,452 Measurement period adjustments related to Global One acquisition — — — 1,766 — Ending balance, June 30, $ 1,927 15,698 (5,053 ) (13,941 ) 4,297 Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — (3,166 ) — (1,707 ) (694 ) Three Months Ended June 30, 2017 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Earnout Liability (1) GGL / SBA Loans Servicing Asset (2) Beginning balance, April 1, $ 1,851 23,679 (5,412 ) (11,421 ) 4,178 Total gains (losses) realized/unrealized: Included in earnings — (1,352 ) — (1,707 ) (376 ) Unrealized gains (losses) included in other comprehensive income 76 — — — — Additions — — — — 495 Sales and settlements — (6,629 ) 359 — — Measurement period adjustments related to Global One acquisition — — — (813 ) — Ending balance, June 30, $ 1,927 15,698 (5,053 ) (13,941 ) 4,297 Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — (1,352 ) — (1,707 ) (376 ) (1) Earnout liability consists of contingent consideration obligation related to the Global One acquisition. (2) Effective January 1, 2017, Synovus elected the fair value option for determining the value of the GGL/SBA loans servicing asset. Synovus has retained servicing responsibilities on sold GGL/SBA loans and receives a servicing fee. The servicing asset is established at fair value at the time of the sale based on an analysis of future cash flows that incorporates estimates for discount rates, prepayment speeds, and delinquency rates. The servicing asset is measured at fair value on a quarterly basis with changes in fair value included with the associated servicing fee in other non-interest income. Prior to 2017, Synovus accounted for the GGL/SBA loans servicing asset using the amortization method. Six Months Ended June 30, 2016 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Beginning balance, January 1, $ 1,745 27,148 (1,415 ) Total gains (losses) realized/unrealized: Included in earnings — (278 ) (720 ) Unrealized gains (losses) included in other comprehensive income (120 ) — — Settlements — (4 ) 720 Ending balance, June 30, $ 1,625 26,866 (1,415 ) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — (278 ) (720 ) Three Months Ended June 30, 2016 (in thousands) Investment Securities Available for Sale Private Equity Investments Visa Derivative Beginning balance, April 1, $ 1,638 26,757 (1,415 ) Total gains (losses) realized/unrealized: Included in earnings — 113 (360 ) Unrealized gains (losses) included in other comprehensive income (13 ) — — Settlements — (4 ) 360 Ending balance, June 30, $ 1,625 26,866 (1,415 ) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at June 30, $ — 113 (360 )
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. June 30, 2017 December 31, 2016 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Impaired loans * $ — — 11,773 11,773 — — 21,742 21,742 Other real estate — — 12,367 12,367 — — 19,305 19,305 Other assets held for sale — — — — — — 12,083 12,083 * Collateral-dependent impaired loans that were written down to fair value during the period.
Assets Measured at Fair Value on a Nonrecurring Basis	The following table presents fair value adjustments recognized in earnings for the three months ended June 30, 2017 and 2016 for the assets measured at fair value on a non-recurring basis. Six Months Ended June 30, Three Months Ended June 30, (in thousands) 2017 2016 2017 2016 Impaired loans * $ 5,808 1,162 $ 5,776 — Other loans held for sale 3,519 — — — Other real estate 518 3,306 280 2,053 Other assets held for sale 238 6,625 — 5,593 * Collateral-dependent impaired loans that were written down to fair value during the period.
Fair Value Inputs, Assets, Quantitative Information	The table below provides 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 and are measured at fair value on a non-recurring basis. 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. June 30, 2017 December 31, 2016 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 (2) Estimated selling costs 0% - 60% (46%) 0% - 10% (7%) 0%-52% (25%) 0%-10% (7%) Other loans held for sale Third-party appraised value of collateral less estimated selling costs Discount to appraised value (2) Estimated selling costs N/A N/A Other real estate Third-party appraised value of real estate less estimated selling costs Discount to appraised value (2) Estimated selling costs 0% - 35% (8%) 0% - 10% (7%) 0%-10% (5%) 0%-10% (7%) Other assets held for sale Third-party appraised value less estimated selling costs or BOV Discount to appraised value (2) Estimated selling costs N/A 0%-81% (47%) 0%-10% (7%) (1) The range represents management's estimate of the high and low of the value that would be assigned to a particular input. For assets measured at fair value on a non-recurring basis, the weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability. (2) Synovus also makes adjustments to the values of the assets listed above for reasons including age of the appraisal, information known by management about the property, such as occupancy rates, changes to the physical condition of the property, and other factors. The table below provides 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 and are measured at fair value on a recurring basis. June 30, 2017 December 31, 2016 Valuation Technique Significant Unobservable Input Range/Weighted Average Range/Weighted Average Assets and liabilities 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 392 bps 442 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 N/A N/A Discount for lack of liquidity (1) N/A 15% GGL/SBA loans servicing asset Discounted cash flow analysis Discount rate Prepayment speeds 12.01% 6.75% N/A Earnout liability Option pricing methods and Monte Carlo simulation Global One Earnout, as defined in merger agreement, for the five years ending October 1, 2021 $11.8 million - $16.7 million $9.3 million - $14.2 million Visa derivative liability Discounted cash flow analysis 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 1-5 years 1-5 years (1) Represents management's estimate of discount that market participants would require based on the instrument's lack of liquidity.
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 June 30, 2017 and December 31, 2016 are as follows: June 30, 2017 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 377,213 377,213 377,213 — — Interest bearing funds with Federal Reserve Bank 468,148 468,148 468,148 — — Interest earning deposits with banks 6,012 6,012 6,012 — — Federal funds sold and securities purchased under resale agreements 46,847 46,847 46,847 — — Trading account assets 3,045 3,045 — 3,045 — Mortgage loans held for sale 61,893 61,893 — 61,893 — Other loans held for sale 127 127 — 127 — Investment securities available for sale 3,827,058 3,827,058 86,275 3,738,856 1,927 Private equity investments 15,698 15,698 — — 15,698 Mutual funds held in rabbi trusts 12,867 12,867 12,867 — — Loans, net of deferred fees and costs 24,430,512 24,191,120 — — 24,191,120 GGL/SBA loans servicing asset 4,297 4,297 — — 4,297 Derivative assets 16,725 16,725 — 16,725 — Financial liabilities Non-interest bearing deposits 7,363,476 7,363,476 — 7,363,476 — Interest bearing deposits 17,855,340 17,852,694 — 17,852,694 — Federal funds purchased, other short-term borrowings and other short-term liabilities 150,379 150,379 150,379 — — Long-term debt 2,107,245 2,155,543 — 2,155,543 — Other liabilities 13,941 13,941 — — 13,941 Derivative liabilities 18,442 18,442 — 13,389 5,053 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

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Summary of Derivative Instruments [Abstract]
Impact of Derivatives on Balance Sheet	The impact of derivative instruments on the Consolidated Balance Sheets at June 30, 2017 and December 31, 2016 is presented below. Fair Value of Derivative Assets Fair Value of Derivative Liabilities (in thousands) Location on Consolidated Balance Sheets June 30, 2017 December 31, 2016 Location on Consolidated Balance Sheets June 30, 2017 December 31, 2016 Derivatives not designated as hedging instruments: Interest rate contracts Other assets $ 15,332 17,157 Other liabilities 13,389 17,531 Mortgage derivatives Other assets 1,393 3,466 Other liabilities — — Visa derivative — — Other liabilities 5,053 5,768 Total derivatives not designated as hedging instruments $ 16,725 20,623 18,442 23,299
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 six and three months ended June 30, 2017 and 2016 is presented below. Location of Gain (Loss) Recognized in Income Gain (Loss) Recognized in Income (in thousands) Six Months Ended June 30, Derivatives not designated as hedging instruments 2017 2016 Interest rate contracts (1) Other non-interest income $ (1 ) 33 Mortgage derivatives (2) Mortgage banking income (2,073 ) (485 ) Total $ (2,074 ) (452 ) Gain (Loss) Recognized in Income (in thousands) Three Months Ended June 30, Derivatives not designated as hedging instruments Location of Gain (Loss) Recognized in Income 2017 2016 Interest rate contracts (1) Other non-interest income $ — 27 Mortgage derivatives (2) Mortgage banking income (289 ) (335 ) Total $ (289 ) (308 ) (1) Gain (loss) represents net fair value adjustments (including credit related adjustments) for customer swaps and offsetting positions. (2) Gain (loss) represents net fair value adjustments recorded for interest rate lock commitments and commitments to sell mortgage loans to third-party investors.

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of Basic And Diluted Earnings per Share	The following table displays a reconciliation of the information used in calculating basic and diluted earnings per common share for the six and three months ended June 30, 2017 and 2016 . Six Months Ended June 30, Three Months Ended June 30, (in thousands, except per share data) 2017 2016 2017 2016 Basic Net Income Per Common Share: Net income available to common shareholders $ 142,742 107,870 $ 73,444 57,898 Weighted average common shares outstanding 122,251 126,164 122,203 125,100 Net income per common share, basic $ 1.17 0.85 $ 0.60 0.46 Diluted Net Income Per Common Share: Net income available to common shareholders $ 142,742 107,870 $ 73,444 57,898 Weighted average common shares outstanding 122,251 126,164 122,203 125,100 Potentially dilutive shares from outstanding equity-based awards 792 614 824 599 Weighted average diluted common shares 123,043 126,778 123,027 125,699 Net income per common share, diluted $ 1.16 0.85 $ 0.60 0.46

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Loan Commitments and Letters of Credit	Unfunded lending commitments and letters of credit at June 30, 2017 and December 31, 2016 are presented below. (in thousands) June 30, 2017 December 31, 2016 Letters of credit* $ 155,542 150,948 Commitments to fund commercial real estate, construction, and land development loans 1,427,947 1,394,162 Unused credit card lines 1,152,324 1,103,431 Commitments under home equity lines of credit 1,126,766 1,096,052 Commitments to fund commercial and industrial loans 5,039,168 4,792,834 Other loan commitments 308,386 307,772 Total unfunded lending commitments and letters of credit $ 9,210,133 8,845,199 * Represent the contractual amount net of risk participations of approximately $61 million and $83 million at June 30, 2017 and December 31, 2016, respectively.

Significant Accounting Polici33

Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017USD ($)branchesATM	Jun. 30, 2017USD ($)branchesATM	Dec. 31, 2016USD ($)
Basis Of Presentation [Line Items]
Number of branches | branches	248	248
Number of ATMs | ATM	327	327
Share-based compensation, excess tax benefit	$ 378	$ 4,500
Cash and Cash Equivalents
Basis Of Presentation [Line Items]
Total deposits	0	0	$ 533
Cash and cash equivalents	120,500	120,500	130,000
Interest earning deposits with banks	5,900	5,900	5,600
Federal funds sold	$ 43,300	$ 43,300	$ 56,100

Acquisition (Narrative) (Detail

Acquisition (Narrative) (Details) - USD ($) $ in Thousands	Oct. 01, 2016	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Common stock, shares issued (in shares)		142,498,906	142,025,720
Common stock		$ 142,499	$ 142,026
Existing Borrower Relationships
Business Acquisition [Line Items]
Useful life		11 years
Other intangible assets		$ 10,100
Trade Names
Business Acquisition [Line Items]
Useful life		10 years
Other intangible assets		$ 1,000
Distribution Network
Business Acquisition [Line Items]
Useful life		8 years
Other intangible assets		$ 544
Global One
Business Acquisition [Line Items]
Consideration transferred	$ 30,000
Common stock, shares issued (in shares)	821,000
Common stock	$ 26,592
Cash paid	$ 3,408
Adjustment in goodwill			2,600
Adjustment in contingent consideration			$ 1,800
Global One | Minimum
Business Acquisition [Line Items]
Potential additional payments based on earnings, period	3 years
Global One | Maximum
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 ($) $ in Thousands	Oct. 01, 2016	Jun. 30, 2017	Dec. 31, 2016
Assets acquired:
Goodwill		$ 57,092	$ 59,678
Liabilities assumed:
Fair value of common stock issued		142,499	142,026
Long-term debt		$ 2,107,245	$ 2,160,881
Global One
Assets acquired:
Cash and due from banks	$ 9,554
Commercial and industrial loans	357,307
Goodwill	32,661
Other intangible assets	12,500
Other assets	3,904
Total assets acquired	415,926
Liabilities assumed:
Notes payable	358,560
Contingent consideration	12,234
Deferred tax liability, net	3,229
Other liabilities	11,903
Total liabilities assumed	385,926
Consideration paid	30,000
Cash paid	3,408
Fair value of common stock issued	26,592
Loans, unpaid principal balance	356,700
Long-term debt	$ 357,000

Share Repurchase Program (Detai

Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions	5 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jan. 17, 2017
Equity [Abstract]
Authorized amount				$ 200,000,000
Value repurchased	$ 45,300,000	$ 45,349,000	$ 171,547,000
Shares repurchased (in shares)	1.1
Shares repurchased, average cost per share (in dollars per share)	$ 42.04

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Millions	Jun. 30, 2017USD ($)securities	Dec. 31, 2016USD ($)
Investments [Abstract]
Pledged to secure deposits | $	$ 1,730	$ 2,040
Investment securities in a loss position for less than twelve months	92
Investment securities in a loss position for twelve months or longer	3

Investment Securities (Summary

Investment Securities (Summary Of Available For Sale Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 3,864,898	$ 3,768,618
Gross Unrealized Gains	7,321	11,114
Gross Unrealized Losses	(45,161)	(61,537)
Fair Value	3,827,058	3,718,195
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	83,493	108,221
Gross Unrealized Gains	0	225
Gross Unrealized Losses	(360)	(644)
Fair Value	83,133	107,802
U.S. Government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,088	12,727
Gross Unrealized Gains	223	266
Gross Unrealized Losses	0	0
Fair Value	12,311	12,993
Mortgage-backed securities issued by U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	132,710	174,440
Gross Unrealized Gains	640	1,116
Gross Unrealized Losses	(1,125)	(1,354)
Fair Value	132,225	174,202
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,881,234	2,543,495
Gross Unrealized Gains	6,169	5,416
Gross Unrealized Losses	(30,998)	(42,571)
Fair Value	2,856,405	2,506,340
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	734,804	905,789
Gross Unrealized Gains	84	1,214
Gross Unrealized Losses	(12,468)	(16,561)
Fair Value	722,420	890,442
State and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	290	2,780
Gross Unrealized Gains	0	14
Gross Unrealized Losses	0	0
Fair Value	290	2,794
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		919
Gross Unrealized Gains		2,863
Gross Unrealized Losses		0
Fair Value		3,782
Corporate debt and other securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,279	20,247
Gross Unrealized Gains	205	0
Gross Unrealized Losses	(210)	(407)
Fair Value	$ 20,274	$ 19,840

Investment Securities (Schedule

Investment Securities (Schedule Of Unrealized Loss On Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 2,989,625	$ 3,012,769
Less than 12 Months, Unrealized Losses	44,161	60,156
12 Months or Longer, Fair Value	28,281	33,315
12 Months or Longer, Unrealized Losses	1,000	1,381
Total Fair Value, Fair Value	3,017,906	3,046,084
Total Fair Value, Unrealized Losses	45,161	61,537
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	64,342	64,023
Less than 12 Months, Unrealized Losses	360	644
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value, Fair Value	64,342	64,023
Total Fair Value, Unrealized Losses	360	644
Mortgage-backed securities issued by U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	95,492	128,121
Less than 12 Months, Unrealized Losses	1,125	1,240
12 Months or Longer, Fair Value	0	3,626
12 Months or Longer, Unrealized Losses	0	114
Total Fair Value, Fair Value	95,492	131,747
Total Fair Value, Unrealized Losses	1,125	1,354
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	2,161,449	2,123,181
Less than 12 Months, Unrealized Losses	30,998	42,571
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total Fair Value, Fair Value	2,161,449	2,123,181
Total Fair Value, Unrealized Losses	30,998	42,571
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	668,342	682,492
Less than 12 Months, Unrealized Losses	11,678	15,653
12 Months or Longer, Fair Value	23,212	24,801
12 Months or Longer, Unrealized Losses	790	908
Total Fair Value, Fair Value	691,554	707,293
Total Fair Value, Unrealized Losses	12,468	16,561
Corporate debt and other securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	14,952
Less than 12 Months, Unrealized Losses	0	48
12 Months or Longer, Fair Value	5,069	4,888
12 Months or Longer, Unrealized Losses	210	359
Total Fair Value, Fair Value	5,069	19,840
Total Fair Value, Unrealized Losses	$ 210	$ 407

Investment Securities (Amortize

Investment Securities (Amortized Cost And Estimated Fair Value By Contractual Maturity Of Investment Securities Available For Sale) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	$ 19,948
1 to 5 Years, Amortized Cost	72,756
5 to 10 Years, Amortized Cost	612,552
More Than 10 years, Amortized Cost	3,156,363
No Stated Maturity, Amortized Cost	3,279
Total, Amortized Cost	3,864,898
Within One Year, Fair Value	19,953
1 to 5 Years, Fair Value	72,594
5 to 10 Years, Fair Value	607,755
More Than 10 years, Fair Value	3,123,614
No Stated Maturity, Fair Value	3,142
Total, Fair Value	3,827,058
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	18,791
1 to 5 Years, Amortized Cost	64,702
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	83,493
Within One Year, Fair Value	18,791
1 to 5 Years, Fair Value	64,342
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	83,133
U.S. Government agency securities
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	1,000
1 to 5 Years, Amortized Cost	5,612
5 to 10 Years, Amortized Cost	5,476
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	12,088
Within One Year, Fair Value	1,004
1 to 5 Years, Fair Value	5,682
5 to 10 Years, Fair Value	5,625
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	12,311
Mortgage-backed securities issued by U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	34,868
More Than 10 years, Amortized Cost	97,842
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	132,710
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	35,007
More Than 10 years, Fair Value	97,218
No Stated Maturity, Fair Value	0
Total, Fair Value	132,225
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	47
1 to 5 Years, Amortized Cost	2,262
5 to 10 Years, Amortized Cost	535,035
More Than 10 years, Amortized Cost	2,343,890
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	2,881,234
Within One Year, Fair Value	48
1 to 5 Years, Fair Value	2,390
5 to 10 Years, Fair Value	529,968
More Than 10 years, Fair Value	2,323,999
No Stated Maturity, Fair Value	0
Total, Fair Value	2,856,405
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	22,173
More Than 10 years, Amortized Cost	712,631
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	734,804
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	21,950
More Than 10 years, Fair Value	700,470
No Stated Maturity, Fair Value	0
Total, Fair Value	722,420
State and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	110
1 to 5 Years, Amortized Cost	180
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
No Stated Maturity, Amortized Cost	0
Total, Amortized Cost	290
Within One Year, Fair Value	110
1 to 5 Years, Fair Value	180
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
No Stated Maturity, Fair Value	0
Total, Fair Value	290
Corporate debt and other securities
Schedule of Available-for-sale Securities [Line Items]
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	15,000
More Than 10 years, Amortized Cost	2,000
No Stated Maturity, Amortized Cost	3,279
Total, Amortized Cost	20,279
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	15,205
More Than 10 years, Fair Value	1,927
No Stated Maturity, Fair Value	3,142
Total, Fair Value	$ 20,274

Investment Securities (Summar41

Investment Securities (Summary Of Sales Transactions In The Investment Securities Available For Sale Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments [Abstract]
Proceeds from sales of investment securities available for sale	$ 55,752	$ 0	$ 338,381	$ 243,609
Gross realized gains on sales	239	0	7,942	954
Gross realized losses on sales	(240)	0	(275)	(887)
Investment securities gains, net	$ (1)	$ 0	$ 7,667	$ 67

Restructuring Charges (Schedule

Restructuring Charges (Schedule Of Restructuring And Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Charges [Abstract]
Severance charges	$ 0	$ 6,453	$ 0	$ 6,453	$ 0
Lease termination charges	0		(13)	0	31
Asset impairment charges	0		5,821	0	6,866
Loss (gain) on sale of assets held for sale, net	(4)		13	(4)	13
Other charges	17		20	75	71
Total restructuring charges, net	$ 13		$ 5,841	$ 6,524	$ 6,981

Restructuring Charges (Restruct

Restructuring Charges (Restructuring Reserve) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 10,004	$ 6,078	$ 4,049	$ 6,617
Accruals for voluntary and involuntary termination benefits		(13)	6,453	31
Payments	(2,743)	(1,097)	(3,241)	(1,680)
Ending balance	7,261	4,968	7,261	4,968
Severance Charges
Restructuring Reserve [Roll Forward]
Beginning balance	6,315	1,533	81	1,930
Accruals for voluntary and involuntary termination benefits		0	6,453	0
Payments	(2,584)	(940)	(2,803)	(1,337)
Ending balance	3,731	593	3,731	593
Lease Termination Charges
Restructuring Reserve [Roll Forward]
Beginning balance	3,689	4,545	3,968	4,687
Accruals for voluntary and involuntary termination benefits		(13)	0	31
Payments	(159)	(157)	(438)	(343)
Ending balance	$ 3,530	$ 4,375	$ 3,530	$ 4,375

Restructuring Charges (Narrativ

Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 0	$ 6,453	$ 0		$ 6,453	$ 0
Special termination benefits		$ 6,200
Restructuring charges	$ 13		5,841		$ 6,524	$ 6,981
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4,800
Business exit costs			$ 1,000	$ 1,100

Loans and Allowance for Loan 45

Loans and Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract	Dec. 31, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans	$ 232,532,000	$ 281,900,000	$ 233,791,000	$ 290,300,000	$ 274,515,000
Interest income recognized	1,834,000	0	3,523,000		8,196,000
Interest income recognized for accruing TDRs		2,000,000		4,000,000
Non-accrual status	$ 60,800,000		60,800,000		53,700,000
Number of contracts | Contract	3
Post-default balance for modifications classified as TDRs	$ 292,000
Provision for loan losses	10,260,000	$ 6,693,000	$ 18,934,000	$ 16,070,000
Troubled Debt Restructurings That Subsequently Defaulted
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | Contract		1	3	1
Post-default balance for modifications classified as TDRs		$ 92,000	$ 292,000	$ 92,000
Accruing TDRs With Modifications And Renewals Completed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing troubled debt restructuring	$ 167,400,000		$ 167,400,000		8,500,000
Provision for loan losses					9,800,000
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loan substandard period (in days)			90 days
Loss And Charged Off
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loans downgraded to loss (in days)			120 days
Accruing TDRs With Modifications And Renewals Completed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing troubled debt restructuring					$ 195,800,000
Accruing TDRs With Modifications And Renewals Completed | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial-type impaired loans			$ 1,000,000

Loans and Allowance for Loan 46

Loans and Allowance for Loan Losses (Schedule Of Current, Accruing Past Due And Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	$ 24,230,445	$ 23,663,898
Accruing 30-89 Days Past Due	62,238	61,971
Accruing 90 Days or Greater Past Due	4,550	3,135
Total Accruing Past Due	66,788	65,106
Non-accrual	159,317	153,378
Total loans	24,456,550	23,882,382	$ 23,088,535
Deferred fees and costs, net	26,000	26,000	$ 27,600
Total commercial real estate
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	7,376,691	7,326,161
Accruing 30-89 Days Past Due	14,103	9,037
Accruing 90 Days or Greater Past Due	299	161
Total Accruing Past Due	14,402	9,198
Non-accrual	23,178	30,615
Total loans	7,414,271	7,365,974
Investment properties
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,028,397	5,861,198
Accruing 30-89 Days Past Due	3,482	2,795
Accruing 90 Days or Greater Past Due	72	0
Total Accruing Past Due	3,554	2,795
Non-accrual	3,712	5,268
Total loans	6,035,663	5,869,261
1-4 family properties
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	818,327	873,231
Accruing 30-89 Days Past Due	8,657	4,801
Accruing 90 Days or Greater Past Due	101	161
Total Accruing Past Due	8,758	4,962
Non-accrual	8,535	9,114
Total loans	835,620	887,307
Land and development
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	529,967	591,732
Accruing 30-89 Days Past Due	1,964	1,441
Accruing 90 Days or Greater Past Due	126	0
Total Accruing Past Due	2,090	1,441
Non-accrual	10,931	16,233
Total loans	542,988	609,406
Total commercial and industrial
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	11,630,913	11,447,947
Accruing 30-89 Days Past Due	23,961	27,455
Accruing 90 Days or Greater Past Due	1,566	964
Total Accruing Past Due	25,527	28,419
Non-accrual	94,468	75,577
Total loans	11,750,908	11,551,943
Commercial, financial and agricultural
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,915,588	6,846,591
Accruing 30-89 Days Past Due	14,670	9,542
Accruing 90 Days or Greater Past Due	765	720
Total Accruing Past Due	15,435	10,262
Non-accrual	69,550	59,074
Total loans	7,000,573	6,915,927
Owner-occupied
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	4,715,325	4,601,356
Accruing 30-89 Days Past Due	9,291	17,913
Accruing 90 Days or Greater Past Due	801	244
Total Accruing Past Due	10,092	18,157
Non-accrual	24,918	16,503
Total loans	4,750,335	4,636,016
Total consumer
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	5,222,841	4,889,790
Accruing 30-89 Days Past Due	24,174	25,479
Accruing 90 Days or Greater Past Due	2,685	2,010
Total Accruing Past Due	26,859	27,489
Non-accrual	41,671	47,186
Total loans	5,291,371	4,964,465
Home equity lines
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,533,528	1,585,228
Accruing 30-89 Days Past Due	8,286	10,013
Accruing 90 Days or Greater Past Due	705	473
Total Accruing Past Due	8,991	10,486
Non-accrual	20,648	21,551
Total loans	1,563,167	1,617,265
Consumer mortgages
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	2,444,866	2,265,966
Accruing 30-89 Days Past Due	7,141	7,876
Accruing 90 Days or Greater Past Due	623	81
Total Accruing Past Due	7,764	7,957
Non-accrual	18,035	22,681
Total loans	2,470,665	2,296,604
Credit cards
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	223,092	229,177
Accruing 30-89 Days Past Due	1,550	1,819
Accruing 90 Days or Greater Past Due	1,258	1,417
Total Accruing Past Due	2,808	3,236
Non-accrual	0	0
Total loans	225,900	232,413
Other consumer loans
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,021,355	809,419
Accruing 30-89 Days Past Due	7,197	5,771
Accruing 90 Days or Greater Past Due	99	39
Total Accruing Past Due	7,296	5,810
Non-accrual	2,988	2,954
Total loans	$ 1,031,639	$ 818,183

Loans and Allowance for Loan 47

Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 24,456,550	$ 23,882,382	$ 23,088,535
Accrual substandard loans	235,800	256,600
Deferred fees and costs, net	$ 26,000	26,000	$ 27,600
Maximum
Financing Receivable, Recorded Investment [Line Items]
Allowance for loan losses, percent of loan amount	50.00%
Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 7,414,271	7,365,974
Investment properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,035,663	5,869,261
1-4 family properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	835,620	887,307
Land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	542,988	609,406
Total commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,750,908	11,551,943
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,000,573	6,915,927
Owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,750,335	4,636,016
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,291,371	4,964,465
Home equity lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,563,167	1,617,265
Consumer mortgages
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,470,665	2,296,604
Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans	225,900	232,413
Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,031,639	818,183
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,758,754	23,147,814
Pass | Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,218,925	7,135,790
Pass | Investment properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,952,286	5,794,626
Pass | 1-4 family properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	788,665	826,311
Pass | Land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	477,974	514,853
Pass | Total commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,300,452	11,105,068
Pass | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,710,038	6,642,648
Pass | Owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,590,414	4,462,420
Pass | Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,239,377	4,906,956
Pass | Home equity lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,535,583	1,589,199
Pass | Consumer mortgages
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,450,658	2,271,916
Pass | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans	224,643	230,997
Pass | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,028,493	814,844
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	302,709	324,593
Special Mention | Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	126,196	137,469
Special Mention | Investment properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	61,451	43,336
Special Mention | 1-4 family properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,169	33,928
Special Mention | Land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,576	60,205
Special Mention | Total commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	176,513	187,124
Special Mention | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	124,412	126,268
Special Mention | Owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	52,101	60,856
Special Mention | Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Home equity lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Consumer mortgages
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Special Mention | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	380,069	387,117
Substandard | Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	65,712	85,450
Substandard | Investment properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	21,926	31,299
Substandard | 1-4 family properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	22,559	26,790
Substandard | Land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	21,227	27,361
Substandard | Total commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	266,764	251,755
Substandard | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	160,354	140,425
Substandard | Owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	106,410	111,330
Substandard | Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	47,593	49,912
Substandard | Home equity lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,812	22,774
Substandard | Consumer mortgages
Financing Receivable, Recorded Investment [Line Items]
Total loans	19,528	23,268
Substandard | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans	445	637
Substandard | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,808	3,233
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,462	19,337
Doubtful | Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,438	7,265
Doubtful | Investment properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | 1-4 family properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	227	278
Doubtful | Land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,211	6,987
Doubtful | Total commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,039	7,855
Doubtful | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,629	6,445
Doubtful | Owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,410	1,410
Doubtful | Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	985	4,217
Doubtful | Home equity lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	373	2,892
Doubtful | Consumer mortgages
Financing Receivable, Recorded Investment [Line Items]
Total loans	313	1,283
Doubtful | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Doubtful | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	299	42
Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,556	3,521
Loss | Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Investment properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | 1-4 family properties
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Total commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans	140	141
Loss | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	140	141
Loss | Owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss | Total consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,416	3,380
Loss | Home equity lines
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,399	2,400
Loss | Consumer mortgages
Financing Receivable, Recorded Investment [Line Items]
Total loans	166	137
Loss | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Total loans	812	779
Loss | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 39	$ 64

Loans and Allowance for Loan 48

Loans and Allowance for Loan Losses (Schedule Of Allowances For Loan Losses And Recorded Investment In Loans) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allowance for loan losses:
Beginning balance, allowance	$ 253,514,000	$ 254,516,000	$ 251,758,000	$ 252,496,000	$ 252,496,000
Charge-offs	(19,663,000)	(15,771,000)	(32,398,000)	(27,086,000)
Recoveries	3,984,000	9,638,000	9,801,000	13,596,000
Provision for loan losses	10,260,000	6,693,000	18,934,000	16,070,000
Ending balance, allowance	248,095,000	255,076,000	248,095,000	255,076,000	251,758,000
Ending balance: individually evaluated for impairment, allowance	12,650,000	28,427,000	12,650,000	28,427,000
Ending balance: collectively evaluated for impairment, allowance	235,445,000	226,649,000	235,445,000	226,649,000
Ending balance: total loans	24,456,550,000	23,088,535,000	24,456,550,000	23,088,535,000	23,882,382,000
Ending balance: individually evaluated for impairment, loans	228,215,000	270,547,000	228,215,000	270,547,000
Ending balance: collectively evaluated for impairment, loans	24,228,335,000	22,817,988,000	24,228,335,000	22,817,988,000
Purchased credit-impaired loans	0	0	0	0
Allowance for purchased credit-impaired loans	0	0	0	0
Deferred fees and costs, net	26,000,000	27,600,000	26,000,000	27,600,000	26,000,000
Commercial Real Estate
Allowance for loan losses:
Beginning balance, allowance	78,314,000	84,557,000	81,816,000	87,133,000	87,133,000
Charge-offs	(1,299,000)	(7,455,000)	(3,207,000)	(9,277,000)
Recoveries	759,000	5,397,000	3,648,000	6,690,000
Provision for loan losses	(247,000)	(3,140,000)	(4,730,000)	(5,187,000)
Ending balance, allowance	77,527,000	79,359,000	77,527,000	79,359,000	81,816,000
Ending balance: individually evaluated for impairment, allowance	4,386,000	12,515,000	4,386,000	12,515,000
Ending balance: collectively evaluated for impairment, allowance	73,141,000	66,844,000	73,141,000	66,844,000
Ending balance: total loans	7,414,271,000	7,507,695,000	7,414,271,000	7,507,695,000
Ending balance: individually evaluated for impairment, loans	73,638,000	112,954,000	73,638,000	112,954,000
Ending balance: collectively evaluated for impairment, loans	7,340,633,000	7,394,741,000	7,340,633,000	7,394,741,000
Commercial & Industrial
Allowance for loan losses:
Beginning balance, allowance	127,096,000	124,878,000	125,778,000	122,989,000	122,989,000
Charge-offs	(12,642,000)	(5,136,000)	(19,535,000)	(10,661,000)
Recoveries	1,458,000	3,078,000	3,282,000	4,342,000
Provision for loan losses	7,525,000	6,813,000	13,912,000	12,963,000
Ending balance, allowance	123,437,000	129,633,000	123,437,000	129,633,000	125,778,000
Ending balance: individually evaluated for impairment, allowance	7,226,000	14,221,000	7,226,000	14,221,000
Ending balance: collectively evaluated for impairment, allowance	116,211,000	115,412,000	116,211,000	115,412,000
Ending balance: total loans	11,750,908,000	10,955,430,000	11,750,908,000	10,955,430,000
Ending balance: individually evaluated for impairment, loans	122,889,000	119,805,000	122,889,000	119,805,000
Ending balance: collectively evaluated for impairment, loans	11,628,019,000	10,835,625,000	11,628,019,000	10,835,625,000
Retail
Allowance for loan losses:
Beginning balance, allowance	48,104,000	45,081,000	44,164,000	42,374,000	42,374,000
Charge-offs	(5,722,000)	(3,180,000)	(9,656,000)	(7,148,000)
Recoveries	1,767,000	1,163,000	2,871,000	2,564,000
Provision for loan losses	2,982,000	3,020,000	9,752,000	8,294,000
Ending balance, allowance	47,131,000	46,084,000	47,131,000	46,084,000	$ 44,164,000
Ending balance: individually evaluated for impairment, allowance	1,038,000	1,691,000	1,038,000	1,691,000
Ending balance: collectively evaluated for impairment, allowance	46,093,000	44,393,000	46,093,000	44,393,000
Ending balance: total loans	5,291,371,000	4,625,410,000	5,291,371,000	4,625,410,000
Ending balance: individually evaluated for impairment, loans	31,688,000	37,788,000	31,688,000	37,788,000
Ending balance: collectively evaluated for impairment, loans	$ 5,259,683,000	$ 4,587,622,000	$ 5,259,683,000	$ 4,587,622,000

Loans and Allowance for Loan 49

Loans and Allowance for Loan Losses (Schedule Of Impaired Loans) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 45,024,000		$ 45,024,000		$ 28,751,000
Recorded Investment, With allowance recorded	183,191,000		183,191,000		220,745,000
Recorded Investment	228,215,000		228,215,000		249,496,000
Unpaid Principal Balance, With no related allowance recorded	63,474,000		63,474,000		40,794,000
Unpaid Principal Balance, With allowance recorded	183,591,000		183,591,000		223,512,000
Unpaid Principal Balance	247,065,000		247,065,000		264,306,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	12,650,000		12,650,000		18,111,000
Related Allowance	12,650,000		12,650,000		18,111,000
Average Recorded Investment, With no related allowance recorded	42,423,000		37,962,000		26,433,000
Average Recorded Investment, With allowance recorded	190,109,000		195,829,000		248,082,000
Average Recorded Investment	232,532,000	$ 281,900,000	233,791,000	$ 290,300,000	274,515,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	1,834,000		3,523,000		8,196,000
Interest Income Recognized	1,834,000	$ 0	3,523,000		8,196,000
Total commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,479,000		2,479,000		3,490,000
Recorded Investment, With allowance recorded	71,159,000		71,159,000		87,920,000
Recorded Investment	73,638,000		73,638,000		91,410,000
Unpaid Principal Balance, With no related allowance recorded	8,121,000		8,121,000		10,975,000
Unpaid Principal Balance, With allowance recorded	71,229,000		71,229,000		87,926,000
Unpaid Principal Balance	79,350,000		79,350,000		98,901,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	4,386,000		4,386,000		7,916,000
Related Allowance	4,386,000		4,386,000		7,916,000
Average Recorded Investment, With no related allowance recorded	2,503,000		2,819,000		9,803,000
Average Recorded Investment, With allowance recorded	71,763,000		73,951,000		108,091,000
Average Recorded Investment	74,266,000		76,770,000		117,894,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	682,000		1,282,000		3,286,000
Interest Income Recognized	682,000		1,282,000		3,286,000
Investment properties
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0		748,000
Recorded Investment, With allowance recorded	29,168,000		29,168,000		31,489,000
Recorded Investment	29,168,000		29,168,000		32,237,000
Unpaid Principal Balance, With no related allowance recorded	0		0		793,000
Unpaid Principal Balance, With allowance recorded	29,168,000		29,168,000		31,489,000
Unpaid Principal Balance	29,168,000		29,168,000		32,282,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	1,175,000		1,175,000		2,044,000
Related Allowance	1,175,000		1,175,000		2,044,000
Average Recorded Investment, With no related allowance recorded	0		246,000		2,013,000
Average Recorded Investment, With allowance recorded	29,264,000		29,575,000		42,659,000
Average Recorded Investment	29,264,000		29,821,000		44,672,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	306,000		597,000		1,436,000
Interest Income Recognized	306,000		597,000		1,436,000
1-4 family properties
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	253,000		253,000		643,000
Recorded Investment, With allowance recorded	15,879,000		15,879,000		23,642,000
Recorded Investment	16,132,000		16,132,000		24,285,000
Unpaid Principal Balance, With no related allowance recorded	2,582,000		2,582,000		2,939,000
Unpaid Principal Balance, With allowance recorded	15,893,000		15,893,000		23,649,000
Unpaid Principal Balance	18,475,000		18,475,000		26,588,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	448,000		448,000		769,000
Related Allowance	448,000		448,000		769,000
Average Recorded Investment, With no related allowance recorded	257,000		380,000		1,021,000
Average Recorded Investment, With allowance recorded	16,133,000		16,995,000		39,864,000
Average Recorded Investment	16,390,000		17,375,000		40,885,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	250,000		386,000		855,000
Interest Income Recognized	250,000		386,000		855,000
Land and development
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,226,000		2,226,000		2,099,000
Recorded Investment, With allowance recorded	26,112,000		26,112,000		32,789,000
Recorded Investment	28,338,000		28,338,000		34,888,000
Unpaid Principal Balance, With no related allowance recorded	5,539,000		5,539,000		7,243,000
Unpaid Principal Balance, With allowance recorded	26,168,000		26,168,000		32,788,000
Unpaid Principal Balance	31,707,000		31,707,000		40,031,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	2,763,000		2,763,000		5,103,000
Related Allowance	2,763,000		2,763,000		5,103,000
Average Recorded Investment, With no related allowance recorded	2,246,000		2,193,000		6,769,000
Average Recorded Investment, With allowance recorded	26,366,000		27,381,000		25,568,000
Average Recorded Investment	28,612,000		29,574,000		32,337,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	126,000		299,000		995,000
Interest Income Recognized	126,000		299,000		995,000
Total commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	40,737,000		40,737,000		23,466,000
Recorded Investment, With allowance recorded	82,152,000		82,152,000		97,094,000
Recorded Investment	122,889,000		122,889,000		120,560,000
Unpaid Principal Balance, With no related allowance recorded	53,348,000		53,348,000		27,954,000
Unpaid Principal Balance, With allowance recorded	82,481,000		82,481,000		99,855,000
Unpaid Principal Balance	135,829,000		135,829,000		127,809,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	7,226,000		7,226,000		8,384,000
Related Allowance	7,226,000		7,226,000		8,384,000
Average Recorded Investment, With no related allowance recorded	38,112,000		33,339,000		14,715,000
Average Recorded Investment, With allowance recorded	87,277,000		89,269,000		104,268,000
Average Recorded Investment	125,389,000		122,608,000		118,983,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	772,000		1,461,000		3,161,000
Interest Income Recognized	772,000		1,461,000		3,161,000
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	26,913,000		26,913,000		17,958,000
Recorded Investment, With allowance recorded	46,569,000		46,569,000		43,386,000
Recorded Investment	73,482,000		73,482,000		61,344,000
Unpaid Principal Balance, With no related allowance recorded	33,098,000		33,098,000		20,577,000
Unpaid Principal Balance, With allowance recorded	46,887,000		46,887,000		45,913,000
Unpaid Principal Balance	79,985,000		79,985,000		66,490,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	5,524,000		5,524,000		5,687,000
Related Allowance	5,524,000		5,524,000		5,687,000
Average Recorded Investment, With no related allowance recorded	26,202,000		22,956,000		6,321,000
Average Recorded Investment, With allowance recorded	48,959,000		46,455,000		51,968,000
Average Recorded Investment	75,161,000		69,411,000		58,289,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	436,000		787,000		1,215,000
Interest Income Recognized	436,000		787,000		1,215,000
Owner-occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	13,824,000		13,824,000		5,508,000
Recorded Investment, With allowance recorded	35,583,000		35,583,000		53,708,000
Recorded Investment	49,407,000		49,407,000		59,216,000
Unpaid Principal Balance, With no related allowance recorded	20,250,000		20,250,000		7,377,000
Unpaid Principal Balance, With allowance recorded	35,594,000		35,594,000		53,942,000
Unpaid Principal Balance	55,844,000		55,844,000		61,319,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	1,702,000		1,702,000		2,697,000
Related Allowance	1,702,000		1,702,000		2,697,000
Average Recorded Investment, With no related allowance recorded	11,910,000		10,383,000		8,394,000
Average Recorded Investment, With allowance recorded	38,318,000		42,814,000		52,300,000
Average Recorded Investment	50,228,000		53,197,000		60,694,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	336,000		674,000		1,946,000
Interest Income Recognized	336,000		674,000		1,946,000
Total consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,808,000		1,808,000		1,795,000
Recorded Investment, With allowance recorded	29,880,000		29,880,000		35,731,000
Recorded Investment	31,688,000		31,688,000		37,526,000
Unpaid Principal Balance, With no related allowance recorded	2,005,000		2,005,000		1,865,000
Unpaid Principal Balance, With allowance recorded	29,881,000		29,881,000		35,731,000
Unpaid Principal Balance	31,886,000		31,886,000		37,596,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	1,038,000		1,038,000		1,811,000
Related Allowance	1,038,000		1,038,000		1,811,000
Average Recorded Investment, With no related allowance recorded	1,808,000		1,804,000		1,915,000
Average Recorded Investment, With allowance recorded	31,069,000		32,609,000		35,723,000
Average Recorded Investment	32,877,000		34,413,000		37,638,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	380,000		780,000		1,749,000
Interest Income Recognized	380,000		780,000		1,749,000
Home equity lines
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,064,000		1,064,000		1,051,000
Recorded Investment, With allowance recorded	7,135,000		7,135,000		9,638,000
Recorded Investment	8,199,000		8,199,000		10,689,000
Unpaid Principal Balance, With no related allowance recorded	1,064,000		1,064,000		1,051,000
Unpaid Principal Balance, With allowance recorded	7,135,000		7,135,000		9,638,000
Unpaid Principal Balance	8,199,000		8,199,000		10,689,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	171,000		171,000		971,000
Related Allowance	171,000		171,000		971,000
Average Recorded Investment, With no related allowance recorded	1,064,000		1,060,000		1,045,000
Average Recorded Investment, With allowance recorded	7,680,000		8,197,000		9,668,000
Average Recorded Investment	8,744,000		9,257,000		10,713,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	229,000		465,000		432,000
Interest Income Recognized	229,000		465,000		432,000
Consumer mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	744,000		744,000		744,000
Recorded Investment, With allowance recorded	18,762,000		18,762,000		20,953,000
Recorded Investment	19,506,000		19,506,000		21,697,000
Unpaid Principal Balance, With no related allowance recorded	941,000		941,000		814,000
Unpaid Principal Balance, With allowance recorded	18,762,000		18,762,000		20,953,000
Unpaid Principal Balance	19,703,000		19,703,000		21,767,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	598,000		598,000		673,000
Related Allowance	598,000		598,000		673,000
Average Recorded Investment, With no related allowance recorded	744,000		744,000		870,000
Average Recorded Investment, With allowance recorded	19,009,000		19,720,000		20,993,000
Average Recorded Investment	19,753,000		20,464,000		21,863,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	92,000		183,000		1,014,000
Interest Income Recognized	92,000		183,000		1,014,000
Credit cards
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0		0
Recorded Investment, With allowance recorded	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance, With no related allowance recorded	0		0		0
Unpaid Principal Balance, With allowance recorded	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	0		0		0
Related Allowance	0		0		0
Average Recorded Investment, With no related allowance recorded	0		0		0
Average Recorded Investment, With allowance recorded	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	0		0		0
Interest Income Recognized	0		0		0
Other consumer loans
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0		0		0
Recorded Investment, With allowance recorded	3,983,000		3,983,000		5,140,000
Recorded Investment	3,983,000		3,983,000		5,140,000
Unpaid Principal Balance, With no related allowance recorded	0		0		0
Unpaid Principal Balance, With allowance recorded	3,984,000		3,984,000		5,140,000
Unpaid Principal Balance	3,984,000		3,984,000		5,140,000
Related Allowance, With no related allowance recorded	0		0		0
Related Allowance, With allowance recorded	269,000		269,000		167,000
Related Allowance	269,000		269,000		167,000
Average Recorded Investment, With no related allowance recorded	0		0		0
Average Recorded Investment, With allowance recorded	4,380,000		4,692,000		5,062,000
Average Recorded Investment	4,380,000		4,692,000		5,062,000
Interest Income Recognized, With no related allowance recorded	0		0		0
Interest Income Recognized, With allowance recorded	59,000		132,000		303,000
Interest Income Recognized	$ 59,000		$ 132,000		$ 303,000

Loans and Allowance for Loan 50

Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	26	49	55	110
Recorded Investment	$ 3,770,000	$ 11,990,000	$ 15,377,000	$ 32,394,000
Net charge-offs	$ 0	$ 0	$ 0
Total commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	9	18	17	33
Recorded Investment	$ 809,000	$ 5,542,000	$ 2,737,000	$ 7,897,000
Investment properties
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	1	0	3
Recorded Investment	$ 0	$ 1,389,000	$ 0	$ 1,974,000
1-4 family properties
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	8	12	16	19
Recorded Investment	$ 674,000	$ 3,419,000	$ 2,602,000	$ 4,654,000
Land and development
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	5	1	11
Recorded Investment	$ 135,000	$ 734,000	$ 135,000	$ 1,269,000
Total commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	11	17	29	51
Recorded Investment	$ 2,657,000	$ 4,626,000	$ 12,061,000	$ 22,010,000
Commercial, financial and agricultural
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	10	15	28	45
Recorded Investment	$ 2,635,000	$ 3,392,000	$ 12,039,000	$ 18,793,000
Owner-occupied
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	2	1	6
Recorded Investment	$ 22,000	$ 1,234,000	$ 22,000	$ 3,217,000
Total consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	6	14	9	26
Recorded Investment	$ 304,000	$ 1,822,000	$ 579,000	$ 2,487,000
Home equity lines
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	1	0	3
Recorded Investment	$ 0	$ 28,000	$ 0	$ 224,000
Consumer mortgages
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	3	1	6
Recorded Investment	$ 9,000	$ 251,000	$ 9,000	$ 405,000
Credit cards
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Other consumer loans
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	5	10	8	17
Recorded Investment	$ 295,000	$ 1,543,000	$ 570,000	$ 1,858,000
Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Total commercial real estate
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Investment properties
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | 1-4 family properties
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Land and development
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Total commercial and industrial
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Commercial, financial and agricultural
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Owner-occupied
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Total consumer
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Home equity lines
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Consumer mortgages
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Credit cards
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness | Other consumer loans
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,373,000	7,872,000	7,849,000	22,833,000
Below Market Interest Rate | Total commercial real estate
Financing Receivable, Modifications [Line Items]
Recorded Investment	478,000	4,484,000	2,089,000	5,316,000
Below Market Interest Rate | Investment properties
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	1,389,000	0	1,826,000
Below Market Interest Rate | 1-4 family properties
Financing Receivable, Modifications [Line Items]
Recorded Investment	478,000	3,095,000	2,089,000	3,490,000
Below Market Interest Rate | Land and development
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Below Market Interest Rate | Total commercial and industrial
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,895,000	3,066,000	5,760,000	16,615,000
Below Market Interest Rate | Commercial, financial and agricultural
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,895,000	1,934,000	5,760,000	13,948,000
Below Market Interest Rate | Owner-occupied
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	1,132,000	0	2,667,000
Below Market Interest Rate | Total consumer
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	322,000	0	902,000
Below Market Interest Rate | Home equity lines
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	28,000	0	224,000
Below Market Interest Rate | Consumer mortgages
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	200,000	0	354,000
Below Market Interest Rate | Credit cards
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Below Market Interest Rate | Other consumer loans
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	94,000	0	324,000
Term Extensions and/or Other Concessions
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,397,000	4,118,000	7,528,000	9,561,000
Term Extensions and/or Other Concessions | Total commercial real estate
Financing Receivable, Modifications [Line Items]
Recorded Investment	331,000	1,058,000	648,000	2,581,000
Term Extensions and/or Other Concessions | Investment properties
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	148,000
Term Extensions and/or Other Concessions | 1-4 family properties
Financing Receivable, Modifications [Line Items]
Recorded Investment	196,000	324,000	513,000	1,164,000
Term Extensions and/or Other Concessions | Land and development
Financing Receivable, Modifications [Line Items]
Recorded Investment	135,000	734,000	135,000	1,269,000
Term Extensions and/or Other Concessions | Total commercial and industrial
Financing Receivable, Modifications [Line Items]
Recorded Investment	762,000	1,560,000	6,301,000	5,395,000
Term Extensions and/or Other Concessions | Commercial, financial and agricultural
Financing Receivable, Modifications [Line Items]
Recorded Investment	740,000	1,458,000	6,279,000	4,845,000
Term Extensions and/or Other Concessions | Owner-occupied
Financing Receivable, Modifications [Line Items]
Recorded Investment	22,000	102,000	22,000	550,000
Term Extensions and/or Other Concessions | Total consumer
Financing Receivable, Modifications [Line Items]
Recorded Investment	304,000	1,500,000	579,000	1,585,000
Term Extensions and/or Other Concessions | Home equity lines
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Term Extensions and/or Other Concessions | Consumer mortgages
Financing Receivable, Modifications [Line Items]
Recorded Investment	9,000	51,000	9,000	51,000
Term Extensions and/or Other Concessions | Credit cards
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Term Extensions and/or Other Concessions | Other consumer loans
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 295,000	$ 1,449,000	$ 570,000	$ 1,534,000

Other Comprehensive Income (L51

Other Comprehensive Income (Loss) (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (47,865)		$ (55,659)
Net unrealized gains (losses) on cash flow hedges
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(12,137)	$ (12,177)	(12,217)	$ (12,297)	$ (12,336)	$ (12,504)
Net unrealized gains (losses) on cash flow hedges | Valuation Allowance of Deferred Tax Assets
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(12,100)
Net unrealized gains (losses) on investment securities available for sale
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(36,586)	$ (43,444)	$ (44,324)	$ 22,459	$ 10,747	$ (18,222)
Net unrealized gains (losses) on investment securities available for sale | Valuation Allowance of Deferred Tax Assets
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (13,300)

Other Comprehensive Income (L52

Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance			$ (55,659)
Other comprehensive income, Net of Tax Amount	$ 6,886	$ 11,745	7,794	$ 40,824
Ending balance	(47,865)		(47,865)
Total
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(54,751)	(740)	(55,659)	(29,819)
Other comprehensive income (loss) before reclassifications	6,857	11,712	12,453	40,722
Amounts reclassified from accumulated other comprehensive income (loss)	29	33	(4,659)	102
Other comprehensive income, Net of Tax Amount	6,886	11,745	7,794	40,824
Ending balance	(47,865)	11,005	(47,865)	11,005
Net unrealized gains (losses) on cash flow hedges
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(12,177)	(12,336)	(12,217)	(12,504)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	40	39	80	207
Other comprehensive income, Net of Tax Amount	40	39	80	207
Ending balance	(12,137)	(12,297)	(12,137)	(12,297)
Net unrealized gains (losses) on investment securities available for sale
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(43,444)	10,747	(44,324)	(18,222)
Other comprehensive income (loss) before reclassifications	6,857	11,712	12,453	40,722
Amounts reclassified from accumulated other comprehensive income (loss)	1	0	(4,715)	(41)
Other comprehensive income, Net of Tax Amount	6,858	11,712	7,738	40,681
Ending balance	(36,586)	22,459	(36,586)	22,459
Post-retirement unfunded health benefit
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	870	849	882	907
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(12)	(6)	(24)	(64)
Other comprehensive income, Net of Tax Amount	(12)	(6)	(24)	(64)
Ending balance	$ 858	$ 843	$ 858	$ 843

Other Comprehensive Income (L53

Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (34,413)	$ (30,944)	$ (66,887)	$ (62,073)
Loss on early extinguishment of debt, net	0	0	0	(4,735)
Income tax (expense) benefit	(41,788)	(33,574)	(75,635)	(64,773)
Investment securities gains, net	(1)	0	7,667	67
Salaries and other personnel expense	(191,747)	(188,611)	(389,133)	(376,844)
Net income available to common shareholders	73,444	57,898	142,742	107,870
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net unrealized gains (losses) on cash flow hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(65)	(64)	(130)	(140)
Loss on early extinguishment of debt, net			0	(197)
Income tax (expense) benefit	25	25	50	130
Net income available to common shareholders	(40)	(39)	(80)	(207)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net unrealized gains (losses) on investment securities available for sale
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	0	0	(2,952)	(26)
Investment securities gains, net	(1)	0	7,667	67
Net income available to common shareholders	(1)	0	4,715	41
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Post-retirement unfunded health benefit
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	(8)	(4)	(16)	(40)
Salaries and other personnel expense	20	10	40	104
Net income available to common shareholders	$ 12	$ 6	$ 24	$ 64

Fair Value Accounting (Financia

Fair Value Accounting (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 3,045	$ 9,314
Investment securities available for sale	3,827,058	3,718,195
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	722,420	890,442
State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	290	2,794
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	83,133	107,802
Mortgage-backed securities issued by U.S. Government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	132,225	174,202
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	2,856,405	2,506,340
Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	20,274	19,840
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale		3,782
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	1,890
Investment securities available for sale	86,275	114,676
Private equity investments	0	0
GGL/SBA loans servicing asset	0
Derivative assets	0	0
Earnout liability	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	3,045	7,424
Investment securities available for sale	3,738,856	3,601,723
Private equity investments	0	0
GGL/SBA loans servicing asset	0
Derivative assets	16,725	20,623
Earnout liability	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	1,927	1,796
Private equity investments	15,698	25,493
GGL/SBA loans servicing asset	4,297
Derivative assets	0	0
Earnout liability	13,941	14,000
Fair Value, Measurements, Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		9,314
Mortgage loans held for sale	61,893	51,545
Investment securities available for sale	3,827,058	3,718,195
Private equity investments	15,698	25,493
Mutual funds held in Rabbi Trusts	12,867	11,479
GGL/SBA loans servicing asset	4,297
Derivative assets	16,725	20,623
Earnout liability	13,941	14,000
Derivative liabilities	18,442	23,299
Fair Value, Measurements, Recurring Basis | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		1,990
Fair Value, Measurements, Recurring Basis | U.S. Government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,587
Investment securities available for sale	12,311	12,993
Fair Value, Measurements, Recurring Basis | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	386	3,438
Investment securities available for sale	722,420	890,442
Fair Value, Measurements, Recurring Basis | State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,072	426
Investment securities available for sale	290	2,794
Fair Value, Measurements, Recurring Basis | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	83,133	107,802
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities issued by U.S. Government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		3,460
Investment securities available for sale	132,225	174,202
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities issued by U.S. Government sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	2,856,405	2,506,340
Fair Value, Measurements, Recurring Basis | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	20,274	19,840
Fair Value, Measurements, Recurring Basis | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale		3,782
Fair Value, Measurements, Recurring Basis | Interest rate contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	15,332	17,157
Derivative liabilities	13,389	17,531
Fair Value, Measurements, Recurring Basis | Mortgage derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,393	3,466
Fair Value, Measurements, Recurring Basis | Visa derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	5,053	5,768
Fair Value, Measurements, Recurring Basis | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	1,890
Mortgage loans held for sale	0	0
Investment securities available for sale	86,275	114,676
Private equity investments		0
Mutual funds held in Rabbi Trusts	12,867	11,479
GGL/SBA loans servicing asset	0
Derivative assets	0	0
Earnout liability	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		1,890
Fair Value, Measurements, Recurring Basis | Level 1 | U.S. Government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	83,133	107,802
Fair Value, Measurements, Recurring Basis | Level 1 | Mortgage-backed securities issued by U.S. Government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Measurements, Recurring Basis | Level 1 | Mortgage-backed securities issued by U.S. Government sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	3,142	3,092
Fair Value, Measurements, Recurring Basis | Level 1 | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale		3,782
Fair Value, Measurements, Recurring Basis | Level 1 | Interest rate contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Mortgage derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Visa derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	3,045	7,424
Mortgage loans held for sale	61,893	51,545
Investment securities available for sale	3,738,856	3,601,723
Private equity investments	0	0
Mutual funds held in Rabbi Trusts	0	0
GGL/SBA loans servicing asset	0
Derivative assets	16,725	20,623
Earnout liability	0	0
Derivative liabilities	13,389	17,531
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		100
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,587
Investment securities available for sale	12,311	12,993
Fair Value, Measurements, Recurring Basis | Level 2 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	386	3,438
Investment securities available for sale	722,420	890,442
Fair Value, Measurements, Recurring Basis | Level 2 | State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,072	426
Investment securities available for sale	290	2,794
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage-backed securities issued by U.S. Government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		3,460
Investment securities available for sale	132,225	174,202
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage-backed securities issued by U.S. Government sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	2,856,405	2,506,340
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	15,205	14,952
Fair Value, Measurements, Recurring Basis | Level 2 | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring Basis | Level 2 | Interest rate contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	15,332	17,157
Derivative liabilities	13,389	17,531
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1,393	3,466
Fair Value, Measurements, Recurring Basis | Level 2 | Visa derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Mortgage loans held for sale	0	0
Investment securities available for sale	1,927	1,796
Private equity investments	15,698	25,493
Mutual funds held in Rabbi Trusts	0	0
GGL/SBA loans servicing asset	4,297
Derivative assets	0	0
Earnout liability	13,941	14,000
Derivative liabilities	5,053	5,768
Fair Value, Measurements, Recurring Basis | Level 3 | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Measurements, Recurring Basis | Level 3 | U.S. Government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | Mortgage-backed securities issued by U.S. Government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | Mortgage-backed securities issued by U.S. Government sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | Corporate debt and other securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	1,927	1,796
Fair Value, Measurements, Recurring Basis | Level 3 | Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring Basis | Level 3 | Interest rate contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | Mortgage derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | Visa derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	$ 5,053	$ 5,768

Fair Value Accounting (Changes

Fair Value Accounting (Changes In Fair Value Included In Consolidated Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Mortgage loans held for sale	$ (249)	$ 878	$ 954	$ 1,850
Fair value	61,893		61,893		$ 51,545
Unpaid principal balance	60,508		60,508		51,114
Fair value less aggregate unpaid principal balance	$ 1,385		$ 1,385		$ 431

Fair Value Accounting (Change56

Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Visa Derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (5,412)	$ (1,415)	$ (5,768)	$ (1,415)
Included in earnings	0	(360)	0	(720)
Unrealized gains (losses) included in other comprehensive income	0	0	0	0
Additions	0		0
Sales and settlements	(359)		(715)
Settlements		360		720
Transfer from amortization method to fair value			0
Measurement period adjustments related to Global One acquisition	0		0
Ending balance	(5,053)	(1,415)	(5,053)	(1,415)
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	0	(360)	0	(720)
Other liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(11,421)		(14,000)
Included in earnings	(1,707)		(1,707)
Unrealized gains (losses) included in other comprehensive income	0		0
Additions	0		0
Sales and settlements	0		0
Transfer from amortization method to fair value			0
Measurement period adjustments related to Global One acquisition	(813)		1,766
Ending balance	(13,941)		(13,941)
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	(1,707)		(1,707)
GGL / SBA Loans Servicing Asset
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4,178		0
Included in earnings	(376)		(694)
Unrealized gains (losses) included in other comprehensive income	0		0
Additions	495		539
Sales and settlements	0		0
Transfer from amortization method to fair value			4,452
Measurement period adjustments related to Global One acquisition	0		0
Ending balance	4,297		4,297
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	(376)		(694)
Investment Securities Available for Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,851	1,638	1,796	1,745
Included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income	76	(13)	131	(120)
Additions	0		0
Sales and settlements	0		0
Settlements		0		0
Transfer from amortization method to fair value			0
Measurement period adjustments related to Global One acquisition	0		0
Ending balance	1,927	1,625	1,927	1,625
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	0	0	0	0
Private Equity Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	23,679	26,757	25,493	27,148
Included in earnings	(1,352)	113	(3,166)	(278)
Unrealized gains (losses) included in other comprehensive income	0	0	0	0
Additions	0		0
Sales and settlements	6,629		6,629
Settlements		(4)		(4)
Transfer from amortization method to fair value			0
Measurement period adjustments related to Global One acquisition	0		0
Ending balance	15,698	26,866	15,698	26,866
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31,	$ (1,352)	$ 113	$ (3,166)	$ (278)

Fair Value Accounting (Assets A

Fair Value Accounting (Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 228,215	$ 249,496
Other real estate	19,476	22,308
Fair Value, Measurements, Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	11,773	21,742
Other real estate	12,367	19,305
Other assets held for sale	0	12,083
Fair Value, Measurements, Nonrecurring Basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other real estate	0	0
Other assets held for sale	0	0
Fair Value, Measurements, Nonrecurring Basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other real estate	0	0
Other assets held for sale	0	0
Fair Value, Measurements, Nonrecurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	11,773	21,742
Other real estate	12,367	19,305
Other assets held for sale	$ 0	$ 12,083

Fair Value Accounting (Assets M

Fair Value Accounting (Assets Measured at Fair Value on Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring Basis - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	$ 5,776	$ 0	$ 5,808	$ 1,162
Other loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	0	0	3,519	0
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	280	2,053	518	3,306
Other assets held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	$ 0	$ 5,593	$ 238	$ 6,625

Fair Value Accounting (Fair Val

Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) - Level 3 - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Measurements, Recurring Basis | Other liabilities | Option pricing methods and Monte Carlo simulation | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Earnings as defined in merger agreement	$ 11.8	$ 9.3
Fair Value, Measurements, Recurring Basis | Other liabilities | Option pricing methods and Monte Carlo simulation | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Earnings as defined in merger agreement	$ 16.7	$ 14.2
Fair Value, Measurements, Recurring Basis | Visa Derivative | Discounted cash flow analysis | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated future monthly fees payable to the derivative counterparty, period	1 year	1 year
Fair Value, Measurements, Recurring Basis | Visa Derivative | Discounted cash flow analysis | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated future monthly fees payable to the derivative counterparty, period	5 years	5 years
Fair Value, Measurements, Recurring Basis | Trust preferred securities | Discounted cash flow analysis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	3.92%	4.42%
Fair Value, Measurements, Recurring Basis | Private equity investments | Internal valuation
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for lack of liquidity		15.00%
Fair Value, Measurements, Recurring Basis | GGL / SBA Loans Servicing Asset | Discounted cash flow analysis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	12.01%
Prepayment speeds	6.75%
Fair Value, Measurements, Nonrecurring Basis | Collateral dependent impaired loans | Third-party appraised value of collateral less estimated selling costs | Minimum
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 Basis | Collateral dependent impaired loans | Third-party appraised value of collateral less estimated selling costs | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	60.00%	52.00%
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring Basis | Collateral dependent impaired loans | Third-party appraised value of collateral less estimated selling costs | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	46.00%	25.00%
Estimated selling costs	7.00%	7.00%
Fair Value, Measurements, Nonrecurring Basis | Other real estate | Third-party appraised value of collateral less estimated selling costs | Minimum
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 Basis | Other real estate | Third-party appraised value of collateral less estimated selling costs | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	35.00%	10.00%
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring Basis | Other real estate | Third-party appraised value of collateral less estimated selling costs | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	8.00%	5.00%
Estimated selling costs	7.00%	7.00%
Fair Value, Measurements, Nonrecurring Basis | Other assets held for sale | Third-party appraised value less estimated selling costs or BOV | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		0.00%
Estimated selling costs		0.00%
Fair Value, Measurements, Nonrecurring Basis | Other assets held for sale | Third-party appraised value less estimated selling costs or BOV | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		81.00%
Estimated selling costs		10.00%
Fair Value, Measurements, Nonrecurring Basis | Other assets held for sale | Third-party appraised value less estimated selling costs or BOV | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value		47.00%
Estimated selling costs		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	Jun. 30, 2017	Dec. 31, 2016
Financial assets
Interest bearing funds with Federal Reserve Bank	$ 468,148	$ 527,090
Interest earning deposits with banks	6,012	18,720
Federal funds sold and securities purchased under resale agreements	46,847	58,060
Trading account assets	3,045	9,314
Mortgage loans held for sale	61,893	51,545
Investment securities available for sale	3,827,058	3,718,195
Loans, net	24,182,417	23,604,633
Financial liabilities
Non-interest bearing deposits	7,363,476	7,085,804
Federal funds purchased, other short-term borrowings and other short-term liabilities	150,379	159,699
Long-term debt	2,107,245	2,160,881
Level 1
Financial assets
Cash and cash equivalents	377,213	395,175
Interest bearing funds with Federal Reserve Bank	468,148	527,090
Interest earning deposits with banks	6,012	18,720
Federal funds sold and securities purchased under resale agreements	46,847	58,060
Trading account assets	0	1,890
Mortgage loans held for sale	0	0
Other loans held for sale	0
Investment securities available for sale	86,275	114,676
Private equity investments	0	0
Mutual funds held in Rabbi Trusts	12,867	11,479
Loans, net	0	0
GGL/SBA loans servicing asset	0
Derivative assets	0	0
Financial liabilities
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Federal funds purchased, other short-term borrowings and other short-term liabilities	150,379	159,699
Long-term debt	0	0
Other liabilities	0	0
Derivative liability positions	0	0
Level 2
Financial assets
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	3,045	7,424
Mortgage loans held for sale	61,893	51,545
Other loans held for sale	127
Investment securities available for sale	3,738,856	3,601,723
Private equity investments	0	0
Mutual funds held in Rabbi Trusts	0	0
Loans, net	0	0
GGL/SBA loans servicing asset	0
Derivative assets	16,725	20,623
Financial liabilities
Non-interest bearing deposits	7,363,476	7,085,804
Interest bearing deposits	17,852,694	17,560,021
Federal funds purchased, other short-term borrowings and other short-term liabilities	0	0
Long-term debt	2,155,543	2,217,544
Other liabilities	0	0
Derivative liability positions	13,389	17,531
Level 3
Financial assets
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	0
Investment securities available for sale	1,927	1,796
Private equity investments	15,698	25,493
Mutual funds held in Rabbi Trusts	0	0
Loans, net	24,191,120	23,709,434
GGL/SBA loans servicing asset	4,297
Derivative assets	0	0
Financial liabilities
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	13,941	14,000
Derivative liability positions	5,053	5,768
Carrying Value
Financial assets
Cash and cash equivalents	377,213	395,175
Interest bearing funds with Federal Reserve Bank	468,148	527,090
Interest earning deposits with banks	6,012	18,720
Federal funds sold and securities purchased under resale agreements	46,847	58,060
Trading account assets	3,045	9,314
Mortgage loans held for sale	61,893	51,545
Other loans held for sale	127
Investment securities available for sale	3,827,058	3,718,195
Private equity investments	15,698	25,493
Mutual funds held in Rabbi Trusts	12,867	11,479
Loans, net	24,430,512	23,856,391
GGL/SBA loans servicing asset	4,297
Derivative assets	16,725	20,623
Financial liabilities
Non-interest bearing deposits	7,363,476	7,085,804
Interest bearing deposits	17,855,340	17,562,256
Federal funds purchased, other short-term borrowings and other short-term liabilities	150,379	159,699
Long-term debt	2,107,245	2,160,881
Other liabilities	13,941	14,000
Derivative liability positions	18,442	23,299
Fair Value
Financial assets
Cash and cash equivalents	377,213	395,175
Interest bearing funds with Federal Reserve Bank	468,148	527,090
Interest earning deposits with banks	6,012	18,720
Federal funds sold and securities purchased under resale agreements	46,847	58,060
Trading account assets	3,045	9,314
Mortgage loans held for sale	61,893	51,545
Other loans held for sale	127
Investment securities available for sale	3,827,058	3,718,195
Private equity investments	15,698	25,493
Mutual funds held in Rabbi Trusts	12,867	11,479
Loans, net	24,191,120	23,709,434
GGL/SBA loans servicing asset	4,297
Derivative assets	16,725	20,623
Financial liabilities
Non-interest bearing deposits	7,363,476	7,085,804
Interest bearing deposits	17,852,694	17,560,021
Federal funds purchased, other short-term borrowings and other short-term liabilities	150,379	159,699
Long-term debt	2,155,543	2,217,544
Other liabilities	13,941	14,000
Derivative liability positions	$ 18,442	$ 23,299

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Remaining unamortized deferred gain (loss) balance of all previously terminated cash flow hedges			$ (130)
Remaining deferred gain balance on all previously terminated fair value hedges			873
Derivative, fair value	$ 5,100		5,800
Gain (loss) on sale of outstanding commitments	(1,700)	$ (1,600)
Collateral requirements	43,300
Deferred gains (loss) on discontinuation of cash flow hedge reclassified to earnings	873	950
Reclassification of hedge-related basis adjustment as a reduction to loss on early extinguishment of debt		1,300
Fixed Rate Residential Mortgage
Derivative [Line Items]
Commitments to fund fixed-rate mortgage loans	87,800		88,200
Unrealized gain on fair value of fixed-rate mortgage loans to customers	(416)	$ 1,200
Sale of outstanding commitments	102,500		126,500
Interest Rate Swap
Derivative [Line Items]
Notional amount of interest rate swap contracts	$ 1,490,000		$ 160,400

Derivative Instruments (Impact

Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other assets
Derivative [Line Items]
Fair value of derivative assets	$ 16,725	$ 20,623
Other assets | Interest rate contracts
Derivative [Line Items]
Fair value of derivative assets	15,332	17,157
Other assets | Mortgage derivatives
Derivative [Line Items]
Fair value of derivative assets	1,393	3,466
Other assets | Visa derivative
Derivative [Line Items]
Fair value of derivative assets	0	0
Other liabilities
Derivative [Line Items]
Fair value of derivative liabilities	18,442	23,299
Other liabilities | Interest rate contracts
Derivative [Line Items]
Fair value of derivative liabilities	13,389	17,531
Other liabilities | Mortgage derivatives
Derivative [Line Items]
Fair value of derivative liabilities	0	0
Other liabilities | Visa derivative
Derivative [Line Items]
Fair value of derivative liabilities	$ 5,053	$ 5,768

Derivative Instruments (Effect

Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (289)	$ (308)	$ (2,074)	$ (452)
Interest rate contracts | Other non-interest income
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0	27	(1)	33
Mortgage derivatives | Mortgage banking income
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (289)	$ (335)	$ (2,073)	$ (485)

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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic Earnings (Loss) Per Share
Net income available to common shareholders	$ 73,444	$ 57,898	$ 142,742	$ 107,870
Weighted average common shares outstanding (in shares)	122,203	125,100	122,251	126,164
Net income per common share, basic (in dollars per share)	$ 0.60	$ 0.46	$ 1.17	$ 0.85
Diluted Earnings (Loss) Per Share
Net income available to common shareholders	$ 73,444	$ 57,898	$ 142,742	$ 107,870
Weighted average common shares outstanding (in shares)	122,203	125,100	122,251	126,164
Potentially dilutive shares from outstanding equity-based awards (in shares)	824	599	792	614
Weighted average number of diluted common shares (in shares)	123,027	125,699	123,043	126,778
Net income per common share, diluted (in dollars per share)	$ 0.60	$ 0.46	$ 1.16	$ 0.85

Net Income Per Common Share (Na

Net Income Per Common Share (Narrative) (Details) - shares shares in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Potentially dilutive shares	2.2	2.5

Share-based Compensation (Detai

Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 3.5	$ 3.5	$ 6.8	$ 6.8
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other equity compensation, shares granted (in shares)			0	0
Options outstanding (in options)	826,000		826,000
Weighted-average exercise price, options (in dollars per share)	$ 17.81		$ 17.81
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Other equity compensation, shares granted (in shares)			230,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other equity compensation, shares granted (in shares)			73,000
Market Restricted Stock Units (MRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Other equity compensation, shares granted (in shares)			73,000
Weighted-average exercise price, shares granted during period (in dollars per share)			$ 41.93
Non-Vested Synovus Shares And Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other equity compensation, non-vested shares outstanding (in shares)	983,000		983,000
Weighted-average exercise price, non-vested shares outstanding (in dollars per share)	$ 32.82		$ 32.82
Minimum | Market Restricted Stock Units (MRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on shareholder return	75.00%		75.00%
Minimum | Performance Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on return on average assets (ROAA)	0.00%		0.00%
Maximum | Market Restricted Stock Units (MRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on shareholder return	125.00%		125.00%
Maximum | Performance Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range based on return on average assets (ROAA)	150.00%		150.00%
2013 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equivalents authorized (in shares)	5,700,000		5,700,000
Shares of authorized but unissued common stock reserved for future grants (in shares)	8,600,000		8,600,000
Contractual term (years)			10 years
2013 Omnibus Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share equivalents ratio (in shares)	1		1
2013 Omnibus Plan | Value Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share equivalents ratio (in shares)	2		2
2013 Omnibus Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
2013 Omnibus Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			5 years

Commitments and Contingencies67

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Contractual amount net of risk participations	$ 61,000	$ 83,000
Guarantee obligations
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	9,210,133	8,845,199
Letters of credit
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	155,542	150,948
Commitments to fund commercial real estate, construction, and land development loans
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	1,427,947	1,394,162
Unused credit card lines
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	1,152,324	1,103,431
Commitments under home equity lines of credit
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	1,126,766	1,096,052
Commitments to fund commercial and industrial loans
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	5,039,168	4,792,834
Other loan commitments
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	$ 308,386	$ 307,772

Legal Proceedings (Details)

Legal Proceedings (Details)	Jun. 30, 2017USD ($)
Minimum
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	$ 0
Maximum
Loss Contingencies [Line Items]
Total unfunded lending commitments and letters of credit	$ 12,000,000

Agreement with World's Foremo69

Agreement with World's Foremost Bank and Capital One Bank (Details) - USD ($) $ in Thousands	Apr. 17, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Brokered deposits		$ 1,468,308		$ 1,468,308		$ 1,378,983
Transaction fee		0	$ 0	86	$ 0
World's Foremost Bank (WFB)
Business Combination, Separately Recognized Transactions [Line Items]
Brokered deposits		$ 1,100,000		$ 1,100,000
Capital One
Business Combination, Separately Recognized Transactions [Line Items]
Transaction fee	$ 75,000
Deposits portfolio, weighted average cost of funds, percent	1.82%
Deposits portfolio, weighted average maturity, period	2 years 9 months 15 days