Synovus Financial (SNV) 10-Q 11 May 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2020	May 07, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2020
Entity File Number	1-10312
Entity Registrant Name	SYNOVUS FINANCIAL CORP
Entity Incorporation, State or Country Code	GA
Entity Tax Identification Number	58-1134883
Entity Address, Address Line One	1111 Bay Avenue
Entity Address, Address Line Two	Suite 500,
Entity Address, City or Town	Columbus,
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	31901
City Area Code	706
Local Phone Number	641-6500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		147,285,880
Entity Central Index Key	0000018349
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $1.00 Par Value
Trading Symbol	SNV
Security Exchange Name	NYSE
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D
Trading Symbol	SNV - PrD
Security Exchange Name	NYSE
Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E
Entity Information [Line Items]
Title of 12(b) Security	Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E
Trading Symbol	SNV - PrE
Security Exchange Name	NYSE

CONSOLIDATED BALANCE SHEETS (un

CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 652,451	$ 535,846
Interest-bearing funds with Federal Reserve Bank	1,020,775	553,390
Interest earning deposits with banks	20,717	20,635
Federal funds sold and securities purchased under resale agreements	129,891	77,047
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	1,823,834	1,186,918
Investment securities available for sale, at fair value	6,937,240	6,778,670
Mortgage loans held for sale, at fair value	119,841	115,173
Loans, net of deferred fees and costs	38,258,024	37,162,450
Allowance for loan losses	(493,452)	(281,402)
Loans, net	37,764,572	36,881,048
Cash surrender value of bank-owned life insurance	1,031,544	775,665
Premises and equipment	482,462	493,940
Goodwill	497,267	497,267
Other intangible assets	53,032	55,671
Other assets	1,909,793	1,418,930
Total assets	50,619,585	48,203,282
Deposits:
Non-interest-bearing deposits	9,659,451	9,439,485
Interest-bearing deposits	30,167,134	28,966,019
Total deposits	39,826,585	38,405,504
Federal funds purchased and securities sold under repurchase agreements	312,776	165,690
Other short-term borrowings	1,175,000	1,753,560
Long-term debt	3,152,339	2,153,897
Other liabilities	1,087,680	782,941
Total liabilities	45,554,380	43,261,592
Shareholders' Equity
Preferred stock - no par value; authorized 100,000,000 shares; issued 22,000,000	537,145	537,145
Common stock - $1.00 par value; authorized 342,857,143 shares; issued 167,359,689 and 166,800,623; outstanding 147,266,662 and 147,157,596	167,360	166,801
Additional paid-in capital	3,821,357	3,819,336
Treasury stock, at cost; 20,093,027 and 19,643,027 shares	(731,806)	(715,560)
Accumulated other comprehensive income, net	256,911	65,641
Retained earnings	1,014,238	1,068,327
Total shareholders’ equity	5,065,205	4,941,690
Total liabilities and shareholders' equity	$ 50,619,585	$ 48,203,282

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	22,000,000	22,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	342,857,143	342,857,143
Common stock, shares issued (in shares)	167,359,689	166,800,623
Common stock, shares outstanding (in shares)	147,266,662	147,157,596
Treasury stock, shares at cost (in shares)	20,093,027	19,643,027

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans, including fees		$ 427,337	$ 447,769
Investment securities available for sale		51,653	49,938
Mortgage loans held for sale		792	391
Federal Reserve Bank balances		1,508	3,671
Other earning assets		2,607	3,070
Total interest income		483,897	504,839
Interest expense:
Deposits		86,002	87,684
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings		5,932	3,463
Long-term debt		18,703	16,517
Total interest expense		110,637	107,664
Net interest income		373,260	397,175
Provision for credit losses	[1]	158,722	23,569
Net interest income after provision for credit losses		214,538	373,606
Non-interest revenue:
Service charges on deposit accounts		20,689	20,859
Fiduciary and asset management fees		15,174	13,578
Card fees		10,950	10,877
Brokerage revenue		12,398	9,379
Mortgage banking income		12,227	5,054
Capital markets income		11,243	5,245
Income from bank-owned life insurance		6,038	5,290
Investment securities gains, net		8,734	75
Other non-interest revenue		6,404	9,021
Total non-interest revenue		103,857	79,378
Non-interest expense:
Salaries and other personnel expense		149,678	139,427
Net occupancy and equipment expense		42,194	38,394
Third-party processing and other services		21,480	17,758
Professional fees		10,675	6,348
FDIC insurance and other regulatory fees		5,278	6,761
Advertising expense		4,752	5,123
Merger-related expense		0	49,738
Other operating expenses		42,222	28,861
Total non-interest expense		276,279	292,410
Income before income taxes		42,116	160,574
Income tax expense		3,595	40,388
Net income		38,521	120,186
Less: Preferred stock dividends		8,291	3,150
Net income available to common shareholders		$ 30,230	$ 117,036
Net income per common share, basic (in dollars per share)		$ 0.21	$ 0.73
Net income per common share, diluted (in dollars per share)		$ 0.20	$ 0.72
Weighted average common shares outstanding, basic (in shares)		147,311	160,927
Weighted average common shares outstanding, diluted (in shares)		148,401	162,760
[1]	Beginning January 1, 2020, provision calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income, Before-tax Amount	$ 42,116	$ 160,574
Net income, Tax Effect	(3,595)	(40,388)
Net income	38,521	120,186
Net unrealized gains (losses) on investment securities available for sale: Before-tax Amount
Net unrealized holding gains (losses) arising during the period, Before-tax Amount	158,341	102,785
Reclassification adjustment for net losses realized in net income, Before-tax Amount	(8,734)	(75)
Net unrealized gains (losses), Before-tax Amount	149,607	102,710
Net unrealized gains (losses) on investment securities available for sale: Tax Effect
Net unrealized holding gains (losses) arising during the period, Tax Effect	(41,011)	(26,621)
Reclassification adjustment for net losses realized in net income, Tax Effect	2,262	19
Net unrealized gains (losses), Tax Effect	(38,749)	(26,602)
Net unrealized gains (losses) on investment securities available for sale: Net of Tax Amount
Net unrealized holding gains (losses) arising during the period, Net of Tax Amount	117,330	76,164
Reclassification adjustment for net losses realized in net income, Net of Tax Amount	(6,472)	(56)
Net unrealized gains (losses), Net of Tax Amount	110,858	76,108
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Before-tax Amount
Net unrealized gains (losses) arising during the period, Before-tax Amount	108,639	0
Reclassification adjustment for realized (gains) losses included in net income, Before-tax Amount	(120)	0
Net change, Before-tax Amount	108,519	0
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Tax Effect
Net unrealized gains (losses) arising during the period, Income Tax	28,138	0
Reclassification adjustment for realized (gains) losses included in net income, Income Tax	31	0
Net change, Income Tax	(28,107)	0
Unrealized gains (losses) on derivative instruments designated as cash flow hedges, Net of Tax Amount
Net unrealized gains (losses) arising during the period, Net of Tax Amount	80,501	0
Reclassification adjustment for realized (gains) losses included in net income, Net of Tax Amount	89	0
Net change, Net of Tax Amount	80,412	0
Post-retirement unfunded health benefit: Before-tax Amount
Reclassification adjustment for realized (gains) losses included in net income, Before-tax Amount	0	(35)
Post-retirement unfunded health benefit: Tax Effect
Reclassification adjustment for realized (gains) losses included in net income, Tax Effect	0	5
Post-retirement unfunded health benefit: Net of Tax Amount
Reclassification adjustment for realized (gains) losses included in net income, Net of Tax Amount	0	(30)
Other comprehensive income (loss), Before-tax Amount	258,126	102,675
Other comprehensive income (loss), Tax Effect	(66,856)	(26,597)
Other comprehensive income (loss), Net of Tax Amount	191,270	76,078
Comprehensive income, Net of Tax Amount	$ 229,791	$ 196,264

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands		Total	FCB Financial Holdings, Inc.	Preferred Stock	Common Stock [Member]	Common Stock [Member]FCB Financial Holdings, Inc.	Additional Paid-in Capital	Additional Paid-in CapitalFCB Financial Holdings, Inc.	Treasury Stock	Treasury StockFCB Financial Holdings, Inc.	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained EarningsFCB Financial Holdings, Inc.
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2016-02		$ 4,270										$ 4,270
Balance at Dec. 31, 2018		3,133,602		$ 195,140	$ 143,300		$ 3,060,561		$ (1,014,746)		$ (94,420)	843,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		120,186										120,186
Other comprehensive income, net of income taxes		76,078									76,078
Issuance of common stock, net of issuance costs			$ 704,756			$ 22,043		$ 682,713
Common stock reissued			877,570							$ 1,014,746			$ (137,176)
Fair value of exchanged equity awards and warrants attributed to purchase price			$ 43,362					$ 43,362
Cash dividends declared on common stock		(47,235)										(47,235)
Cash dividends declared on preferred stock	[1]	(3,150)										(3,150)
Repurchases of stock including costs to repurchase		(320,167)							(320,167)
Restricted share unit vesting and taxes paid related to net share settlement		(8,412)			235		(8,647)
Stock options exercised		6,649			351		6,029		269
Share-based compensation expense		10,244					10,244
Balance at Mar. 31, 2019		4,597,753		195,140	165,929		3,794,262		(319,898)		(18,342)	780,662
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2016-13	[2]	(35,721)										(35,721)
Balance at Dec. 31, 2019		4,941,690		537,145	166,801		3,819,336		(715,560)		65,641	1,068,327
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		38,521										38,521
Other comprehensive income, net of income taxes		191,270									191,270
Cash dividends declared on common stock		(48,598)										(48,598)
Cash dividends declared on preferred stock	[1]	(8,291)										(8,291)
Repurchases of stock including costs to repurchase		(16,246)							(16,246)
Restricted share unit vesting and taxes paid related to net share settlement		(7,257)			345		(7,602)
Stock options exercised		6,267			214		6,053
Share-based compensation expense		3,570					3,570
Balance at Mar. 31, 2020		$ 5,065,205		$ 537,145	$ 167,360		$ 3,821,357		$ (731,806)		$ 256,911	$ 1,014,238
[1]	For the three months ended March 31, 2020, dividends per share were $0.39 and $0.37 for Series D and Series E Preferred Stock, respectively. For the three months ended March 31, 2019, dividends per share were $0.39 for Series D Preferred Stock.
[2]	For additional information, see "Part I - Item 1. Financial Statements and Supplementary Data - Note 1 - Basis of Presentation" in this Report.

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock (in dollars per share)	$ 0.33	$ 0.30
Series D Preferred Stock
Cash dividends on preferred stock (in dollars per share)	0.39	$ 0.39
Series E Preferred Stock
Cash dividends on preferred stock (in dollars per share)	$ 0.37

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income		$ 38,521	$ 120,186
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	[1]	158,722	23,569
Depreciation, amortization, and accretion, net		23,649	7,000
Deferred income tax (benefit) expense		(10,978)	6,915
Originations of mortgage loans held for sale		(254,395)	(120,207)
Proceeds from sales of mortgage loans held for sale		259,224	104,552
Gain on sales of mortgage loans held for sale, net		(9,497)	(3,534)
(Increase) decrease in other assets		(442,711)	21,634
Increase (decrease) in other liabilities		260,486	(27,776)
Investment securities gains, net		(8,734)	(75)
Loss on early extinguishment of debt		1,904	0
Share-based compensation expense		3,570	10,244
Net cash provided by operating activities		19,761	142,508
Investing Activities
Net cash received in business combination, net of cash paid		0	201,100
Proceeds from maturities and principal collections of investment securities available for sale		341,431	197,726
Proceeds from sales of investment securities available for sale		413,180	1,642,239
Purchases of investment securities available for sale		(755,558)	(2,254,346)
Proceeds from sales of loans		11,808	13,654
Proceeds from sales of other real estate and other assets		8,547	6,273
Net increase in loans		(1,065,125)	(423,514)
Net (purchases) redemptions of Federal Home Loan Bank stock		(978)	1,285
Net (purchases) redemptions of Federal Reserve Bank stock		(454)	(24,239)
Net (purchases) proceeds from settlement of bank-owned life insurance policies		(249,942)	656
Net increase in premises and equipment		(6,941)	(9,209)
Net cash used in investing activities		(1,304,032)	(648,375)
Financing Activities
Net increase in deposits		1,420,659	434,677
Net increase in federal funds purchased and securities sold under repurchase agreements		147,086	47,552
Net change in other short-term borrowings		(578,560)	203,000
Repayments and redemption of long-term debt		(251,904)	0
Proceeds from issuance of long-term debt, net		1,248,441	297,045
Dividends paid to common shareholders		(44,149)	(28,966)
Dividends paid to preferred shareholders		(3,150)	(3,150)
Stock options and warrants exercised		6,267	6,649
Repurchase of common stock		(16,246)	(320,167)
Taxes paid related to net share settlement of equity awards		(7,257)	(8,412)
Net cash provided by financing activities		1,921,187	628,228
Increase in cash and cash equivalents including restricted cash		636,916	122,361
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period		1,186,918	1,143,564
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period		1,823,834	1,265,925
Supplemental Disclosures:
Income taxes paid		920	1,050
Interest paid		109,340	95,630
Non-cash Activities
Common stock issued, treasury stock reissued, equity awards/warrants exchanged to acquire FCB		0	1,625,688
Securities sold during the period but settled after period-end		169,748	0
Securities purchased during the period but settled after period-end		113,818	0
Premises and equipment transferred to other assets held for sale		4,681	785
Loans foreclosed and transferred to other real estate		1,951	1,419
Loans transferred to/(from) other loans held for sale at fair value		11,893	12,237
Dividends declared on common stock during the period but paid after period-end		48,598	47,235
Dividends declared on preferred stock during the period but paid after period-end		$ 5,141	$ 0
[1]	Beginning January 1, 2020, provision calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies	Note 1 - Basis of Presentation and Accounting Policies General 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, asset-based lending, structured lending, and international banking. Synovus Bank is positioned in markets in the Southeast, with 299 branches and 386 ATMs in Alabama, Florida, Georgia, South Carolina, and Tennessee. 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' 2019 Form 10-K. Reclassifications Prior periods' consolidated financial statements are reclassified whenever necessary to conform to the current periods' presentation. Use of Estimates in the Preparation of Financial Statements In preparing the 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 change relate to the determination of the ACL; estimates of fair value, including goodwill impairment assessment; income taxes; and contingent liabilities including legal matters, among others. Non-TDR Modifications due to COVID-19 Coronavirus Aid, Relief, and Economic Security Act (CARES Act) The U.S. has been operating under a presidentially declared state of emergency since March 13, 2020 ("National Emergency"). On March 27, 2020, the CARES Act was signed into law. Among other emergency measures aimed to lessen the impact of COVID-19, the CARES Act creates a forbearance program for federally backed mortgage loans, protects borrowers from negative credit reporting due to loan accommodations related to the National Emergency, and provides financial institutions the option to temporarily suspend certain requirements under GAAP related to TDRs for a limited period of time to account for the effects of COVID-19. Regulatory agencies, as set forth in the Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus (initially issued on March 22, 2020 and revised on April 7, 2020), have encouraged financial institutions to work prudently with borrowers who are or may be unable to meet their contractual payment obligations because of the effects of COVID-19. In this statement, the regulatory agencies expressed their view of loan modification programs as positive actions that may mitigate adverse effects on borrowers due to COVID-19 and that the agencies will not criticize institutions for working with borrowers in a safe and sound manner. Moreover, the revised statement provides that eligible loan modifications related to COVID-19 may be accounted for under section 4013 of the CARES Act or in accordance with ASC 310-40. Section 4013 of The CARES Act allows banks to elect to not consider loan modifications related to COVID-19 that are made between March 1, 2020 and the earlier of December 31, 2020, or 60 days after the COVID-19 national emergency ends to borrowers that are current (i.e., less than 30 days past due as of December 31, 2019) as TDRs. The regulatory agencies further stated that performing loans granted payment deferrals due to COVID-19 are not considered past due or non-accrual. FASB confirmed the foregoing regulatory agencies' view, that such short-term modifications (e.g., six months) made on a good-faith basis in response to COVID-19 for borrowers who are current are not TDRs. As such, beginning in late March 2020, Synovus provided relief programs consisting primarily of 90-day payment deferral relief to borrowers negatively impacted by COVID-19. Recently Adopted Accounting Standards ASU 2016-13, Financial Instruments-Credit Losses (ASC 326). On January 1, 2020, Synovus adopted ASU 2016-13 (and all subsequent ASUs on this topic), which replaces the existing incurred loss impairment guidance with an expected credit loss methodology (referred to as CECL). CECL requires management’s estimate of credit losses over the full remaining expected life of loans and other financial instruments and for Synovus, applies to loans, unfunded loan commitments, and available for sale debt securities. Upon adoption, Synovus applied the modified retrospective approach and recorded an after-tax cumulative-effect adjustment to beginning retained earnings for non-PCD assets (formerly non-PCI assets) and unfunded commitments of $35.7 million. Additionally, an initial estimate of expected credit losses on PCD assets (formerly PCI or ASC 310-30) was recognized with an offset to the cost basis of the related loans of $62.2 million. As permitted by transition guidance, Synovus did not reassess whether PCI assets met the criteria of PCD assets as of the adoption date. The remaining non-credit discount (based on the adjusted amortized cost basis) will be accreted into interest income. Results for reporting periods after adoption are presented under ASC 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. The following table illustrates the impact of ASC 326 adoption: As of January 1, 2020 in thousands Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported under ASC 326 Assets Allowance for loan losses: Commercial and industrial $ 145,782 $ (2,310) $ 143,472 Commercial real estate 67,430 (651) 66,779 Consumer 68,190 85,955 154,145 Total allowance for loan losses $ 281,402 $ 82,994 $ 364,396 Liabilities Reserve for unfunded commitments $ 1,375 $ 27,440 $ 28,815 Allowance for credit losses $ 282,777 $ 110,434 $ 393,211 The following table illustrates the distribution of the ASC 326 adoption impact to loans and equity: As of January 1, 2020 in thousands Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported under ASC 326 Loans, net $ 36,881,048 $ (20,767) $ 36,860,281 Retained earnings 1,068,327 (35,721) 1,032,606 On March 27, 2020, the federal banking regulators issued an interim final rule, updating CECL transition options, which allows electing banking organizations to delay an estimate of the effect of CECL on regulatory capital for up to two years, followed by a three-year phase-in transition period. March 31, 2020 regulatory capital ratios reflect Synovus' election of the five-year transition provision. In conjunction with the adoption of ASC 326, the following are additional disclosures about our significant accounting policies related to CECL. Investment Securities Available for Sale Investment securities available for sale are carried at fair value with unrealized gains and losses, net of the related tax effect, excluded from earnings and reported as a separate component of shareholders' equity within accumulated other comprehensive income (loss) until realized. For investment securities available for sale in an unrealized loss position, if Synovus has an intention to sell the security or it is more likely than not that the security will be required to be sold prior to recovery, the security is written down to its fair value. The write down is charged against the ACL with any additional impairment recorded in earnings. If the aforementioned criteria is not met, Synovus performs a quarterly assessment of its available for sale debt securities to determine if the decline in fair value of a security below its amortized cost is related to credit losses or other factors. Management cons iders the extent to which fair value is less than amortized cost, the issuer of the security, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. In assessing whether credit related impairment exists, the present value of cash flows expected to be collected from the security is compared to the security's amortized cos t. If the present value of cash flows expected to be collected is less than the security's amortized cost basis, the difference is attributable to credit losses. For such differences, Synovus records an allowance for credit losses ("ACL") with an offset to provision for credit losses expense. Synovus limits the ACL recorded to the amount the security's fair value is less than the amortized cost basis. Impairment losses related to other factors are recognized in other comprehensive income (loss). Accrued interest on available for sale debt securities is excluded from the ACL determination and is recognized within other assets on the consolidated balance sheets. Available-for-sale debt securities are placed on non-accrual status when we no longer expect to receive all contractual amounts due, which is generally at 90 days past due. Accrued interest receivable is reversed against interest income when a security is placed on non-accrual status. Accordingly, we do not recognize an allowance for credit loss against accrued interest receivable. Loans Held for Investment and Interest Income Loans the Company has the intent and ability to hold for the foreseeable future are reported at principal amounts outstanding less amounts charged off, net of deferred fees and costs, and purchase premiums/discounts. Interest income, net deferred fees, and purchase premium/discount amortization/accretion on loans, are recognized on a level yield basis. Allowance for Credit Losses for Loans Held for Investment The allowance for credit losses on loans held for investment are included in the ALL and represent management's estimate of credit losses expected over the life of the loans included in Synovus' existing loans held for investment portfolio. Changes to the allowance are recorded through a provision for credit losses and reduced by loans charged-off, net of recoveries. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. Accrued but uncollected interest is recorded in other assets on the consolidated balance sheets. The Company elected not to measure an ACL for accrued interest receivables as allowable per ASC 326-20-30-5A as Synovus' non-accrual policies result in the timely write-off of accrued but uncollected interest. Credit loss measurement Synovus' loan loss estimation process includes procedures to appropriately consider the unique characteristics of its loan portfolio segments (commercial and industrial ("C&I"), commercial real estate ("CRE") and consumer). These segments are further disaggregated into loan classes, the level at which credit quality is assessed and monitored (as described in the subsequent sections). The ALL is measured on a collective (pool) basis when similar risk characteristics exist. Loans are grouped based upon the nature of the loan type and are further segregated based upon the individual loan risk ratings. Credit loss assumptions are primarily estimated using a discounted cash flow ("DCF") model applied to the aforementioned loan groupings. This model calculates an expected life-of-loan loss percentage for each loan category by considering the forecasted PD, which is the probability that a borrower will default, adjusted for relevant forecasted macroeconomic factors, and LGD, which is the estimate of the amount of net loss in the event of default. Expected credit losses are estimated over the contractual term of the loan, adjusted for expected prepayments and curtailments when appropriate. Management's determination of the contract term excludes expected extensions, renewals, and modifications unless either of the following applies: there is a reasonable expectation at the reporting date that a TDR will be executed with an individual borrower or the extension or renewal option is included in the contract at the reporting date and is not unconditionally cancellable by Synovus. To the extent the lives of the loans in the portfolio extend beyond the period for which a reasonable and supportable forecast can be made (which is 1 year for Synovus), the Company reverts, on a straight-line basis back to the historical rates. Life-of-loan loss percentages may also be adjusted, as necessary, for certain quantitative and qualitative factors that in management's judgment are necessary to reflect losses expected in the portfolio. These adjustments address inherent limitations in the quantitative model including uncertainty and limitations, among others. The above reflects the ALL estimation process for most commercial and consumer sub-pools. In some cases, Synovus may apply other acceptable loss rate models (as permitted by policy) to smaller subpools. Loans that do not share risk characteristics are individually evaluated on a loan by loan basis with specific reserves, if any, recorded as appropriate. Specific reserves are determined based on two methods: discounted cash flow based upon the loan's contractual effective interest rate or at the fair value of the collateral, less costs to sell if the loan is collateral-dependent. Under the discounted cash flow method, resulting expected credit losses are recorded as a specific reserve with a charge-off for any portion of the expected credit loss that is determined not to be recoverable. The reserve is reassessed each quarter and adjusted as appropriate based on changes in estimated cash flows. Additionally, where guarantors are determined to be a source of repayment, an assessment of the guarantee is required. This guarantee assessment would include, but not be limited to, factors such as type and feature of the guarantee, consideration for the guarantor's financial strength and capacity to service the loan in combination with the guarantor's other financial obligations as well as the guarantor's willingness to assist in servicing the loan. If the loan is collateral-dependent, then the fair value of the loan's collateral, less estimated selling costs, is compared to the loan's carrying amount to determine impairment. Fair value is estimated using appraisals performed by a certified or licensed appraiser. Management also considers other factors or recent developments, such as changes in absorption rates or market conditions at the time of valuation, selling costs and anticipated sales values, taking into account management's plans for disposition, which could result in adjustments to the fair value estimates indicated in the appraisals. The assumptions used in determining the amount of the impairment are subject to significant judgment. Use of different assumptions, for example, changes in the fair value of the collateral or management's plans for disposition could have a significant impact on the amount of impairment. Troubled debt restructurings The ALL on a TDR is measured using the same method as all other loans held for investment, except that the original interest rate, and not the rate specified with the restructuring, is used to discount the expected cash flows. Purchased Loans with Credit Deterioration Purchased loans are evaluated upon acquisition in order to determine if the loan or pool of loans has experienced more-than-insignificant deterioration in credit quality since origination or issuance. In the performance of this evaluation, Synovus considers migration of the credit quality of the loans at origination in comparison to the credit quality at acquisition. Purchased loans classified as PCD are recognized in accordance with ASC 326-20-30, whereby the amortized cost basis of the PCD asset is ‘grossed-up’ by the initial estimate of credit losses with an offset to the ALL. This acquisition date allowance has no income statement effect. Post-acquisition, any changes in estimates of expected credit losses are recorded through the provision for credit losses. Non-credit discounts or premiums are accreted or amortized, respectively into interest income using the interest method. Loans formerly accounted for as purchased credit-impaired in accordance with ASC 310-30 were automatically transitioned to PCD classification. The Company did not maintain ASC 310-30 pools. PCD loans were integrated into existing pool structures based upon the nature of the loan type and are further segregated based upon the individual loan risk ratings as noted above. The accounting treatment for purchased loans classified as non-PCD is the same as loans held for investment as detailed in the above section. Allowance for Credit Losses on Off-balance-sheet Credit Exposures Synovus maintains a separate ACL for off-balance-sheet credit exposures, including unfunded loan commitments, unless the associated obligation is unconditionally cancellable by the Company. This allowance is included in other liabilities on the consolidated balance sheets with offsetting expense recognized as a component of the provision for credit losses on the consolidated statements of income. The reserve for off-balance-sheet credit exposures considers the likelihood that funding will occur and estimates the expected credit losses on resulting commitments expected to be funded over its estimated life. Recently Issued Accounting Standards Not Yet Adopted ASU 2020-04, Reference Rate Reform: Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASC 848). Facilitation of the Effects of Reference Rate Reform on Financial Reporting, provides temporary, optional guidance to ease the potential burden in accounting for, or recognizing the effects of, the transition away from the LIBOR or other interbank offered rate on financial reporting. To help with the transition to new reference rates, the ASU provides optional expedients and exceptions for applying GAAP to affected contract modifications and hedge accounting relationships. The main provisions include: • A change in a contract’s reference interest rate would be accounted for as a continuation of that contract rather than as the creation of a new one for contracts, including loans, debt, leases, and other arrangements, that meet specific criteria. • When updating its hedging strategies in response to reference rate reform, an entity would be allowed to preserve its hedge accounting. The guidance is applicable only to contracts or hedge accounting relationships that reference LIBOR or another reference rate expected to be discontinued. Because the guidance is meant to help entities through the transition period, it will be in effect for a limited time and will not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship. The amendments in this ASU are effective March 12, 2020 through December 31, 2022. We are evaluating the impact of adopting the new guidance on the consolidated financial statements on an ongoing basis with no material expected impac t at this time.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Acquisitions	Note 2 - Acquisitions Acquisition of FCB Financial Holdings, Inc. Effective January 1, 2019 (the "Acquisition Date"), Synovus completed its acquisition of all of the outstanding stock of FCB, a bank holding company based in Weston, Florida, for total consideration of $1.63 billion. Effective January 1, 2019, FCB's wholly-owned banking subsidiary, Florida Community Bank, National Association, merged into Synovus Bank. The acquisition of FCB expanded Synovus' presence in Florida and the Southeast adding $9.29 billion in loans and $10.93 billion in deposits, on the Acquisition Date. The acquisition of FCB constituted a business combination and was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations, with the valuation finalized as of December 31, 2019 . The results of FCB's operations are included in Synovus' consolidated financial statements since the Acquisition Date. In connection with the FCB acquisition, Synovus incurred merger-related expense presented in the table below totaling $49.7 million for the three months ended March 31, 2019, primarily related to employment compensation agreements, severance, professional services, and contract termination charges: (in thousands) Three Months Ended March 31, 2019 Employment compensation agreements, severance, and other employee benefit costs $ 32,988 Professional fees 15,200 All other expense (1) 1,550 Total merger-related expense $ 49,738 (1) Primarily relates to fees associated with lease exit accruals, asset impairments related to the integration, and contract termination charges. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 2 - Acquisitions" to the consolidated financial statements of Synovus' 2019 Form 10-K for additional information on Synovus' acquisition of FCB. Acquisition of Global One On October 1, 2016, Synovus completed its acquisition of all of the outstanding stock of Global One. Under the terms of the merger agreement, the purchase price included additional annual payments ("Earnout Payments") to Global One's former shareholders over a three five

Investment Securities Available

Investment Securities Available for Sale	3 Months Ended
	Mar. 31, 2020
Investments [Abstract]
Investment Securities Available for Sale	Note 3 - Investment Securities Available for Sale The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities available for sale at March 31, 2020 and December 31, 2019 are summarized below. March 31, 2020 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 19,918 $ — $ — $ 19,918 U.S. Government agency securities 72,424 2,469 (37) 74,856 Mortgage-backed securities issued by U.S. Government agencies 53,557 1,866 (1) 55,422 Mortgage-backed securities issued by U.S. Government sponsored enterprises 5,312,698 237,127 — 5,549,825 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 601,585 27,297 (2) 628,880 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises 311,235 24,502 — 335,737 State and municipal securities 1,007 2 (4) 1,005 Asset-backed securities 154,954 150 (9,129) 145,975 Corporate debt securities and other debt securities 129,376 921 (4,675) 125,622 Total investment securities available for sale $ 6,656,754 $ 294,334 $ (13,848) $ 6,937,240 December 31, 2019 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 19,855 $ — $ — $ 19,855 U.S. Government agency securities 35,499 1,042 — 36,541 Mortgage-backed securities issued by U.S. Government agencies 56,328 560 (72) 56,816 Mortgage-backed securities issued by U.S. Government sponsored enterprises 5,079,396 103,495 (2,076) 5,180,815 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 629,706 7,349 (204) 636,851 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises 357,291 14,301 — 371,592 State and municipal securities 2,069 6 — 2,075 Asset-backed securities 323,237 4,315 (152) 327,400 Corporate debt securities and other debt securities 144,410 2,317 (2) 146,725 Total investment securities available for sale $ 6,647,791 $ 133,385 $ (2,506) $ 6,778,670 At March 31, 2020 and December 31, 2019, investment securities with a carrying value of $2.16 billion and $1.71 billion, respectively, were pledged to secure certain deposits and other liabilities, as required by law or contractual agreements. Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2020 and December 31, 2019 are presented below. March 31, 2020 Less than 12 Months 12 Months of Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses U.S. Government agency securities $ 38,502 $ (37) $ — $ — $ 38,502 $ (37) Mortgage-backed securities issued by U.S. Government agencies 6 (1) — — 6 (1) Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 320 (1) 32 (1) 352 (2) State and municipal securities 503 (4) — — 503 (4) Asset-backed securities 140,993 (9,129) — — 140,993 (9,129) Corporate debt securities and other debt securities 105,446 (4,675) — — 105,446 (4,675) Total $ 285,770 $ (13,847) $ 32 $ (1) $ 285,802 $ (13,848) December 31, 2019 Less than 12 Months 12 Months of Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Mortgage-backed securities issued by U.S. Government agencies $ 19,543 $ (70) $ 355 $ (2) $ 19,898 $ (72) Mortgage-backed securities issued by U.S. Government sponsored enterprises 768,040 (2,076) — — 768,040 (2,076) Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 57,670 (204) — — 57,670 (204) Asset-backed securities 37,156 (116) 4,954 (36) 42,110 (152) Corporate debt securities and other debt securities 9,505 (2) — — 9,505 (2) Total $ 891,914 $ (2,468) $ 5,309 $ (38) $ 897,223 $ (2,506) As of March 31, 2020, Synovus had 17 investment securities in a loss position for less than twelve months and 3 investment securities in a loss position for twelve months or longer. At December 31, 2019, Synovus had 26 investment securities in a loss position for less than twelve months and 5 investment securities in a loss position for twelve months or longer. Synovus does not intend to sell investment securities in an unrealized loss position prior to the recovery of the unrealized loss, which may not 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. As such, no write-downs to the amortized cost basis of the portfolio were recorded in the current period. Synovus has evaluated investment securities that are in an unrealized loss position as of March 31, 2020 and determined the following by investment category: Asset-backed securities - Synovus considers the amount of credit support available to absorb losses for these holdings. For securities in which adequate credit support is not available, Synovus compares the present value of expected cash flows to the amortized cost of the individual securities. Assumptions used in cash flow determination include expected future default rates, severity of loss, and prepayments. The analysis performed at March 31, 2020 indicated the decline in fair value of asset-backed securities was unrelated to credit losses and was instead attributable to wider market spreads. As such, no ACL was recorded during the period and unrealized losses were recognized in other comprehensive income, net of tax. Corporate debt securities - Synovus considers the credit quality of each issuer and whether payments of principal and interest are current. None of the investment securities described above are past due as of March 31, 2020. At March 31, 2020, these securities are rated investment grade and the decline in fair value was largely driven by wider market spreads. As such, no ACL was recorded during the period and unrealized losses were recognized in other comprehensive income, net of tax. The amortized cost and fair value by contractual maturity of investment securities available for sale at March 31, 2020 are shown below. The expected life of mortgage-backed securities or CMOs may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. For purposes of the maturity table, mortgage-backed securities and CMOs, which are not due at a single maturity date, have been classified based on the final contractual maturity date. Distribution of Maturities at March 31, 2020 (in thousands) Within One 1 to 5 5 to 10 More Than Total Amortized Cost U.S. Treasury securities $ 19,918 $ — $ — $ — $ 19,918 U.S. Government agency securities 568 3,367 43,501 24,988 72,424 Mortgage-backed securities issued by U.S. Government agencies — 1,542 803 51,212 53,557 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 517 86,523 5,225,658 5,312,698 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 296 601,289 601,585 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 109,774 116,210 85,251 311,235 State and municipal securities — — — 1,007 1,007 Asset-backed securities — — 154,954 — 154,954 Corporate debt securities and other debt securities 24,127 94,619 8,630 2,000 129,376 Total amortized cost $ 44,613 $ 209,819 $ 410,917 $ 5,991,405 $ 6,656,754 Fair Value U.S. Treasury securities $ 19,918 $ — $ — $ — $ 19,918 U.S. Government agency securities 578 3,426 45,897 24,955 74,856 Mortgage-backed securities issued by U.S. Government agencies — 1,588 831 53,003 55,422 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 536 92,059 5,457,230 5,549,825 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 309 628,571 628,880 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 116,257 129,175 90,305 335,737 State and municipal securities — — — 1,005 1,005 Asset-backed securities — — 145,975 — 145,975 Corporate debt securities and other debt securities 24,068 92,574 7,418 1,562 125,622 Total fair value $ 44,564 $ 214,381 $ 421,664 $ 6,256,631 $ 6,937,240 Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the three months ended March 31, 2020 and 2019 are presented below. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale. Three Months Ended March 31, (in thousands) 2020 2019 Proceeds from sales of investment securities available for sale $ 413,180 $ 1,642,239 Gross realized gains on sales 8,734 9,130 Gross realized losses on sales — (9,055) Investment securities gains, net $ 8,734 $ 75

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2020
Loans and Allowance for Loan Losses [Abstract]
Loans and Allowance for Loan Losses	Note 4 - Loans and Allowance for Loan Losses The following tables provide a summary of current, accruing past due, and non-accrual loans by portfolio class as of March 31, 2020 and December 31, 2019. Current, Accruing Past Due, and Non-accrual Loans March 31, 2020 (in thousands) Current Accruing 30-89 Days Past Due (1) Accruing 90 Days or Greater Past Due (1) Total Accruing Past Due (1) Non-accrual with an ALL (1) Non-accrual without an ALL (1) Total Commercial, financial and agricultural $ 10,896,890 $ 21,149 $ 829 $ 21,978 $ 78,263 $ 21,024 $ 11,018,155 Owner-occupied 6,614,799 10,279 852 11,131 7,718 9,639 6,643,287 Total commercial and industrial 17,511,689 31,428 1,681 33,109 85,981 30,663 17,661,442 Investment properties 9,252,438 3,056 85 3,141 2,212 — 9,257,791 1-4 family properties 744,451 4,636 56 4,692 2,325 — 751,468 Land and development 658,624 976 142 1,118 1,935 265 661,942 Total commercial real estate 10,655,513 8,668 283 8,951 6,472 265 10,671,201 Consumer mortgages 5,583,714 10,836 — 10,836 13,017 554 5,608,121 Home equity lines 1,759,571 5,873 943 6,816 12,475 — 1,778,862 Credit cards 256,445 2,465 2,671 5,136 — — 261,581 Other consumer loans 2,277,102 17,567 820 18,387 6,860 — 2,302,349 Total consumer 9,876,832 36,741 4,434 41,175 32,352 554 9,950,913 Total loans $ 38,044,034 $ 76,837 $ 6,398 $ 83,235 $ 124,805 $ 31,482 $ 38,283,556 (2) December 31, 2019 (in thousands) Current Accruing 30-89 Days Past Due Accruing 90 Days or Greater Past Due Total Accruing Past Due Non-accrual ASC 310-30 Loans (3) Total Commercial, financial and agricultural $ 9,137,585 $ 38,916 $ 1,206 $ 40,122 $ 56,017 $ 1,019,135 $ 10,252,859 Owner-occupied 5,691,095 5,164 576 5,740 9,780 823,196 6,529,811 Total commercial and industrial 14,828,680 44,080 1,782 45,862 65,797 1,842,331 16,782,670 Investment properties 7,303,146 1,344 — 1,344 1,581 1,736,608 9,042,679 1-4 family properties 733,984 2,073 304 2,377 2,253 41,401 780,015 Land and development 577,711 808 — 808 1,110 78,161 657,790 Total commercial real estate 8,614,841 4,225 304 4,529 4,944 1,856,170 10,480,484 Consumer mortgages 3,681,553 4,223 730 4,953 11,369 1,848,493 5,546,368 Home equity lines 1,691,759 7,038 171 7,209 12,034 2,155 1,713,157 Credit cards 263,065 3,076 2,700 5,776 — — 268,841 Other consumer loans 2,363,101 18,688 616 19,304 5,704 8,185 2,396,294 Total consumer 7,999,478 33,025 4,217 37,242 29,107 1,858,833 9,924,660 Total loans $ 31,442,999 $ 81,330 $ 6,303 $ 87,633 $ 99,848 $ 5,557,334 $ 37,187,814 (4) (1) For purposes of this table, non-performing and past due loans exclude COVID-19 loan modifications. (2) Total before net deferred fees and costs of $25.5 million. (3) Represents loans (at fair value) acquired from FCB accounted for under ASC 310-30, net of discount of $90.3 million and payments since Acquisition Date and also include $1.8 million in non-accrual loans, $9.6 million in accruing 90 days or greater past due loans, and $26.5 million in 30-89 days past due loans. (4) Total before net deferred fees and costs of $25.4 million. Interest income on non-accrual loans outstanding at March 31, 2020 and 2019 that would have been recorded if the loans had been current and performing in accordance with their original terms was $2.1 million for each of the three months ended March 31, 2020 and 2019. O f the interest income recognized during the three months ended March 31, 2020 and 2019, cash-basis interest income was $961 thousand and $648 thousand, respectively. Loans with carrying values of $15.24 billion and $12.11 billion, respectively, were pledged as collateral for borrowings and capacity at March 31, 2020 and December 31, 2019, respectively, to the FHLB and Federal Reserve Bank. 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. Synovus fully reserves for any loans rated as Loss. 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 Retail Credit Classification Policy. Additionally, in accordance with Interagency Supervisory Guidance, the risk grade classifications of consumer loans (consumer mortgages and HELOCs) 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. The risk characteristics and collateral information of each portfolio segment are as follows: Commercial and Industrial Loans The C&I loan portfolio is comprised of general middle market and commercial banking clients across a diverse set of industries. In accordance with Synovus' lending policy, each loan undergoes a detailed underwriting process which incorporates uniform underwriting standards and oversight in proportion to the size and complexity of the lending relationship. These loans are secured by collateral such as business equipment, inventory, and real estate. Whether for real estate or non-real estate purpose, credit decisions on loans in the C&I portfolio are based on cash flow from the operations of the business as the primary source of repayment of the debt, with underlying real estate or other collateral being the secondary source of repayment . Commercial Real Estate Loans CRE loans primarily consist of income-producing investment properties loans. Additionally, CRE loans include 1-4 family properties loans as well as land and development loans. Investment properties loans consist of construction and mortgage loans for income-producing properties and are primarily made to finance multi-family properties, hotels, office buildings, shopping centers, warehouses and other commercial development properties. 1-4 family properties loans include construction loans to homebuilders and commercial mortgage loans related to 1-4 family rental properties and are almost always secured by the underlying property being financed by such loans. These properties are primarily located in the markets served by Synovus. Land and development loans include commercial and residential development as well as land acquisition loans and are secured by land held for future development, typically in excess of one year. Properties securing these loans are substantially within markets served by Synovus, and loan terms generally include personal guarantees from the principals. Loans in this portfolio are underwritten based on the LTV of the collateral and the capacity of the guarantor(s). Consumer Loans The consumer loan portfolio consists of a wide variety of loan products offered through Synovus' banking network including first and second residential mortgages, HELOCs, and credit card loans, as well as home improvement loans and student loans from third-party lending partnerships. The majority of Synovus' consumer loans are consumer mortgages and The following table summarizes each loan portfolio class by risk grade and origination as of March 31, 2020. Loan Portfolio by Risk Grade and Origination March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans (in thousands) 2020 2019 2018 2017 2016 Prior Amortized Cost Basis Converted to Term Loans Total Commercial, financial and agricultural Pass $ 550,653 $ 1,657,933 $ 1,115,403 $ 769,493 $ 642,584 $ 954,718 $ 4,922,661 $ 78,912 $ 10,692,357 Special Mention 1,884 6,304 18,293 30,775 2,090 13,352 57,251 2,223 132,172 Substandard (1) 2,935 13,677 46,404 6,442 10,500 40,659 63,437 721 184,775 Doubtful (2) — — — 198 915 91 6,919 728 8,851 Total commercial, financial and agricultural 555,472 1,677,914 1,180,100 806,908 656,089 1,008,820 5,050,268 82,584 11,018,155 Owner-occupied Pass 386,363 1,213,917 1,271,307 1,116,905 714,764 1,503,199 284,048 — 6,490,503 Special Mention — 5,742 5,000 12,431 5,058 15,252 — — 43,483 Substandard (1) 338 7,352 38,459 29,820 3,912 29,397 23 — 109,301 Total owner-occupied 386,701 1,227,011 1,314,766 1,159,156 723,734 1,547,848 284,071 — 6,643,287 Total commercial and industrial 942,173 2,904,925 2,494,866 1,966,064 1,379,823 2,556,668 5,334,339 82,584 17,661,442 Investment properties Pass 387,787 1,961,810 2,339,056 1,690,528 855,438 1,765,377 184,095 — 9,184,091 Special Mention 836 92 2,117 4,754 5 10,146 — — 17,950 Substandard (1) 160 1,668 1,718 2,124 1,278 48,802 — — 55,750 Total investment properties 388,783 1,963,570 2,342,891 1,697,406 856,721 1,824,325 184,095 — 9,257,791 1-4 family properties Pass 47,219 203,421 103,044 118,126 54,752 138,793 70,505 — 735,860 Special Mention 5 2,006 — — 815 410 2,273 — 5,509 Substandard (1) 69 2,920 3,726 988 387 1,923 86 — 10,099 Total 1-4 family properties 47,293 208,347 106,770 119,114 55,954 141,126 72,864 — 751,468 Land and development Pass 21,204 205,099 104,987 87,990 26,427 96,809 90,201 — 632,717 Special Mention — 1,544 2,394 639 — 8,608 5,738 — 18,923 Substandard (1) 115 1,327 2,905 635 964 4,356 — — 10,302 Total land and development 21,319 207,970 110,286 89,264 27,391 109,773 95,939 — 661,942 Total commercial real estate 457,395 2,379,887 2,559,947 1,905,784 940,066 2,075,224 352,898 — 10,671,201 Loan Portfolio by Risk Grade and Origination (continued) March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans (in thousands) 2020 2019 2018 2017 2016 Prior Amortized Cost Basis Converted to Term Loans Total Consumer mortgages Pass $ 279,510 $ 1,149,232 $ 701,190 $ 942,965 $ 898,374 $ 1,622,114 $ 880 $ — $ 5,594,265 Substandard (1) — 784 281 1,488 1,811 9,418 — — 13,782 Loss (3) — — — — — 74 — — 74 Total consumer mortgages 279,510 1,150,016 701,471 944,453 900,185 1,631,606 880 — 5,608,121 Home equity lines Pass — — — — — — 1,666,627 93,499 1,760,126 Substandard (1) — — — — — — 11,824 5,949 17,773 Doubtful (2) — — — — — — 17 20 37 Loss (3) — — — — — — 736 190 926 Total home equity lines — — — — — — 1,679,204 99,658 1,778,862 Credit cards Pass — — — — — — 258,904 — 258,904 Substandard (1) — — — — — — 736 — 736 Loss (4) — — — — — — 1,941 — 1,941 Total credit cards — — — — — — 261,581 — 261,581 Other consumer loans Pass 121,380 788,397 438,760 413,899 185,671 100,619 245,304 — 2,294,030 Substandard (1) — 1,117 588 3,849 1,439 1,111 215 — 8,319 Total other consumer loans 121,380 789,514 439,348 417,748 187,110 101,730 245,519 — 2,302,349 Total consumer 400,890 1,939,530 1,140,819 1,362,201 1,087,295 1,733,336 2,187,184 99,658 9,950,913 Total loans (5) $ 1,800,458 $ 7,224,342 $ 6,195,632 $ 5,234,049 $ 3,407,184 $ 6,365,228 $ 7,874,421 $ 182,242 $ 38,283,556 (1) Includes $266.4 million of Substandard accruing loans at March 31, 2020. (2) The loans within this risk grade are on non-accrual status and generally have an ALL equal to 50% of the loan amount. (3) The loans within this risk grade are on non-accrual status and have an ALL 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 ALL equal to the full loan amount and are generally charged off upon reaching 181 days past due in accordance with the FFIEC Retail Credit Classification Policy. (5) Total before net deferred fees and costs of $25.5 million. Loan Portfolio by Risk Grade December 31, 2019 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss (3) Total Commercial, financial and agricultural $ 9,940,359 $ 128,506 $ 182,831 $ 1,163 $ — $ 10,252,859 Owner-occupied 6,386,055 58,330 85,426 — — 6,529,811 Total commercial and industrial 16,326,414 186,836 268,257 1,163 — 16,782,670 Investment properties 8,968,712 16,490 57,477 — — 9,042,679 1-4 family properties 766,529 3,249 10,237 — — 780,015 Land and development 629,351 18,643 9,796 — — 657,790 Total commercial real estate 10,364,592 38,382 77,510 — — 10,480,484 Consumer mortgages 5,527,746 — 18,376 97 149 5,546,368 Home equity lines 1,697,086 — 14,806 21 1,244 1,713,157 Credit cards 266,146 — 818 — 1,877 (4) 268,841 Other consumer loans 2,390,199 — 6,095 — — 2,396,294 Total consumer 9,881,177 — 40,095 118 3,270 9,924,660 Total loans (5) $ 36,572,183 $ 225,218 $ 385,862 $ 1,281 $ 3,270 $ 37,187,814 (1) Includes $288.8 million of substandard accruing loans at December 31, 2019. (2) The loans within this risk grade are on non-accrual status and generally have an ALL equal to 50% of the loan amount. (3) The loans within this risk grade are on non-accrual status and have an ALL 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 ALL equal to the full loan amount and are generally charged off upon reaching 181 days past due in accordance with the FFIEC Retail Credit Classification Policy. (5) Total before net deferred fees and costs of $25.4 million. Collateral-Dependent Loans We classify a loan as collateral-dependent when our borrower is experiencing financial difficulty, and we expect repayment to be provided substantially through the operation or sale of collateral. Our commercial loans have collateral that is comprised of real estate and business assets. Our consumer loans have collateral that is substantially comprised of residential real estate. There were no significant changes in the extent to which collateral secures our collateral-dependent loans during the three months ended March 31, 2020. The following tables detail the changes in the ALL by loan segment for the three months ended March 31, 2020 and 2019. Allowance for Loan Losses Roll Forward As Of and For the Three Months Ended March 31, 2020 (in thousands) Commercial & Industrial Commercial Real Estate Consumer Total Allowance for loan losses: Beginning balance, prior to adoption of ASU 2016-13 $ 145,782 $ 67,430 $ 68,190 $ 281,402 Impact from adoption of ASU 2016-13 (2,310) (651) 85,955 82,994 Charge-offs (14,885) (1,017) (7,972) (23,874) Recoveries 1,741 399 1,673 3,813 Provision for loan losses 86,622 40,956 21,539 149,117 Ending balance $ 216,950 $ 107,117 $ 169,385 $ 493,452 As Of and For the Three Months Ended March 31, 2019 (in thousands) Commercial & Industrial Commercial Real Estate Consumer Total Allowance for loan losses: Beginning balance $ 133,123 $ 68,796 $ 48,636 $ 250,555 Charge-offs (13,039) (1,233) (6,427) (20,699) Recoveries 1,990 344 1,277 3,611 Provision for loan losses 13,565 1,102 8,902 23,569 Ending balance $ 135,639 $ 69,009 $ 52,388 $ 257,036 Provision for credit losses and allowance for the quarter, which includes both the ALL and the reserve for unfunded commitments, were impacted by the adoption of CECL on January 1, 2020. The impact on provision for credit losses for the three months ending March 31, 2020 and the allowance at March 31, 2020, compared to prior year, was amplified by the heightened economic distress resulting from the COVID-19 pandemic. Our 2019 disclosures included in "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies" of Synovus' 2019 Form 10-K referenced a two-year reasonable and supportable forecast period used in CECL estimates, but it was deemed more appropriate to reduce that to a one-year horizon during this period of heightened economic uncertainty. A one-year reversion to historical losses follows the reasonable and supportable forecast period. Our modeling process incorporates quantitative and qualitative considerations that are used to inform CECL estimates. The internally developed economic forecast used to determine the allowance for credit losses as of March 31, 2020 was approved late in the first quarter pursuant to Synovus' economic forecasting governance processes. Between that approval date and March 31, 2020, further deterioration in the economic outlook occurred which resulted in the need for a qualitative overlay to our allowance for credit losses. The qualitative overlay of $37.3 million adds 10 bps to the allowance for credit losses and better aligns the total allowance with the economic indicators and forecasts at March 31, 2020. The deterioration of the economic environment since January 1, 2020 due to the effects of COVID-19 resulted in an ACL to loans ratio of 1.39% at March 31, 2020. Economic projections are an important consideration in CECL estimates. Significant economic uncertainty remains as a result of the continuing healthcare crisis and the ultimate impact of government stimulation efforts. If our economic outlook on June 30, 2020 evidences further deterioration, then we would expect to see a further increase in the allowance for credit losses. Information about Synovus' TDRs is presented in the following tables. The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the three months ended March 31, 2020 and 2019 that were reported as accruing or non-accruing TDRs. TDRs by Concession Type Three Months Ended March 31, 2020 (in thousands, except contract data) Number of Contracts Below Market Interest Rate Other Concessions (1) Total Commercial, financial and agricultural 36 $ 3,724 $ 2,011 $ 5,735 Owner-occupied 5 1,367 96 1,463 Total commercial and industrial 41 5,091 2,107 7,198 Investment properties 2 23,070 — 23,070 1-4 family properties 6 724 442 1,166 Land and development 1 449 — 449 Total commercial real estate 9 24,243 442 24,685 Consumer mortgages 6 515 1,083 1,598 Home equity lines 19 275 964 1,239 Other consumer loans 29 78 1,897 1,975 Total consumer 54 868 3,944 4,812 Total TDRs 104 $ 30,202 $ 6,493 $ 36,695 (2) Three Months Ended March 31, 2019 (in thousands, except contract data) Number of Contracts Below Market Interest Rate Other Concessions(1) Total Commercial, financial and agricultural 13 $ 1,783 $ 899 $ 2,682 Owner-occupied 2 949 — 949 Total commercial and industrial 15 2,732 899 3,631 Investment properties 1 482 — 482 1-4 family properties 6 793 — 793 Total commercial real estate 7 1,275 — 1,275 Consumer mortgages 4 128 1,214 1,342 Home equity lines 1 — 105 105 Other consumer loans 18 108 1,046 1,154 Total consumer 23 236 2,365 2,601 Total TDRs 45 $ 4,243 $ 3,264 $ 7,507 (3) (1) Other concessions generally include term extensions, interest only payments for a period of time, or principal forgiveness, but there was no principal forgiveness for the three months ending March 31, 2020 and 2019. (2) No net charge-offs were recorded during the three months ended March 31, 2020. (3) No net charge-offs were recorded during the three months ended March 31, 2019. For the three months ended March 31, 2020 there were 3 defaults with a recorded investment of $618 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 no defaults for the three months ended March 31, 2019. As of March 31, 2020 and December 31, 2019, there were no commitments to lend a material amount of additional funds to any customer whose loan was classified as a TDR.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 5 - Goodwill and Other Intangible Assets Goodwill allocated to each reporting unit at March 31, 2020 and December 31, 2019 is presented as follows (the FMS reportable segment includes two reporting units of Consumer Mortgages and Wealth Management): (in thousands) Community Banking Reporting Unit Wholesale Banking Reporting Unit Consumer Mortgages Reporting Unit Wealth Management Reporting Unit Total Balance as of December 31, 2019 $ 256,323 $ 171,636 $ 44,877 $ 24,431 $ 497,267 Goodwill acquired and adjustments during the year — — — — — Balance as of March 31, 2020 $ 256,323 $ 171,636 $ 44,877 $ 24,431 $ 497,267 Goodwill is evaluated for impairment on an annual basis or whenever an event occurs or circumstances change to indicate that it is more likely than not that an impairment loss has been incurred (i.e. a triggering event). Synovus conducted a goodwill impairment assessment as of December 31, 2019, following Synovus' reorganization, applying ASC 350-20-35-3A Goodwill Subsequent Measurement - Qualitative Assessment Approach and concluded that goodwill was not impaired. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 19 -Segment Reporting" to the consolidated financial statements of Synovus' 2019 Form 10-K for information on Synovus' reorganization during 2019. During the first quarter of 2020, Synovus assessed the indicators of goodwill impairment for each reporting unit and noted certain events related to COVID-19 that indicated it was more likely than not that goodwill was impaired, necessitating an interim test. Triggering events included Synovus' stock price trading below book value for several weeks prior to quarter-end, a series of emergency rate cuts by the Federal Reserve in March, as well as general economic uncertainty surrounding the pandemic. As such, Synovus performed a quantitative assessment of goodwill impairment as of March 31, 2020, which included determining the estimated fair value of each reporting unit and comparing that fair value to the reporting unit's carrying amount. The results of this test indicated that the estimated fair value of each reporting unit exceeded its carrying amount as of March 31, 2020; therefore, goodwill is not impaired as of the testing date. A significant decline in Synovus’ expected future cash flows or estimated growth rates, or a prolonged decline in the price of Synovus’ common stock, due to further deterioration in the economic environment, may necessitate additional interim tests and/or the recording of an impairment charge on goodwill during 2020. The following table shows the gross carrying amount and accumulated amortization of other intangible assets as of March 31, 2020 and December 31, 2019, which primarily consist of core deposit intangible assets acquired in the FCB acquisition. The CDI is being amortized over its estimated useful life of approximately ten years utilizing an accelerated method. Aggregate other intangible assets amortization expense for the three months ended March 31, 2020 and 2019 was $2.6 million and $3.4 million, respectively. (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Value March 31, 2020 CDI $ 57,400 $ (12,784) $ 44,616 Other 12,500 (4,084) 8,416 Total other intangible assets $ 69,900 $ (16,868) $ 53,032 December 31, 2019 CDI $ 57,400 $ (10,436) $ 46,964 Other 12,500 (3,793) 8,707 Total other intangible assets $ 69,900 $ (14,229) $ 55,671

Shareholders' Equity and Other

Shareholders' Equity and Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Shareholders' Equity and Other Comprehensive Income (Loss)	Note 6 - Shareholders' Equity and Other Comprehensive Income (Loss) Repurchases of Common Stock During the three months ended March 31, 2020, Synovus repurchased $16.2 million, or 450 thousand shares of its common stock, at an average price of $36.08 per share, under the share repurchase program announced on January 24, 2020. Dividends The following table presents dividends declared related to common stock. For information related to preferred stock dividends, see "Part II - Item 8. Financial Statements and Supplementary Data - Note 10 - Shareholders' Equity and Other Comprehensive Income" to the consolidated financial statements of Synovus' 2019 Form 10-K. Three Months Ended March 31, 2020 2019 Cash dividends declared per share $ 0.33 $ 0.30 Equity-Based Compensation Plans The following tables summarize the status of Synovus' stock options, restricted share units, market restricted share units, and performance share units as of March 31, 2020 and activity for the three months ended March 31, 2020. Stock Options (in thousands, except per share amounts) Quantity Weighted-Average Exercise Price Per Share Outstanding at January 1, 2020 3,037 $ 22.74 Exercised (220) 29.05 Expired/canceled (6) 20.99 Outstanding at March 31, 2020 2,811 $ 22.25 RSUs, MRSUs, and PSUs (in thousands, except per share amounts) Quantity Weighted-Average Grant Date Fair Value Per Share Non-vested at January 1, 2020 1,312 $ 39.28 Granted 689 36.63 Quantity change based on TSR and performance factors 23 36.63 Dividend equivalents granted 12 36.63 Vested (556) 39.25 Forfeited (5) 36.63 Non-vested at March 31, 2020 1,475 $ 38.01 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 three months ended March 31, 2020 and 2019. Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes) (in thousands) Net unrealized gains (losses) on investment securities available for sale (1) Net unrealized gains (losses) on cash flow hedges (1) Post-retirement unfunded health benefit Total Balance, December 31, 2019 $ 83,666 $ (18,487) $ 462 $ 65,641 Other comprehensive income (loss) before reclassifications 117,330 80,501 — 197,831 Amounts reclassified from AOCI (6,472) (89) — (6,561) Net current period other comprehensive income (loss) 110,858 80,412 — 191,270 Balance at March 31, 2020 $ 194,524 $ 61,925 $ 462 $ 256,911 Balance, December 31, 2018 $ (83,179) $ (12,137) $ 896 $ (94,420) Other comprehensive income (loss) before reclassifications 76,164 — — 76,164 Amounts reclassified from AOCI (56) — (30) (86) Net current period other comprehensive income (loss) 76,108 — (30) 76,078 Balance at March 31, 2019 $ (7,071) $ (12,137) $ 866 $ (18,342) (1) For all periods presented, the ending balance in net unrealized gains (losses) on cash flow hedges and investment securities available for sale includes unrealized losses of $12.1 million and $13.3 million, respectively, related to residual tax effects remaining in OCI due to previously established deferred tax asset valuation allowances in 2010 and 2011. In accordance with ASC 740-20-45-11(b), under the portfolio approach, these unrealized losses are realized at the time the entire portfolio is sold or disposed.

Fair Value Accounting

Fair Value Accounting	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Accounting	Note 7 - Fair Value Accounting Fair value accounting guidance defines fair value as the exchange price that would be received to sell an asset or paid to transfer a liability (an "exit price") in the principal or most advantageous market available to the entity in an orderly transaction between market participants, on the measurement date. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies" of Synovus' 2019 Form 10-K for a description of how fair value measurements are determined. Assets and Liabilities Measured at Fair Value on a Recurring Basis The following tables present all financial instruments measured at fair value on a recurring basis as of March 31, 2020 and December 31, 2019. March 31, 2020 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: Commercial mortgage-backed securities issued by U.S. Government sponsored enterprises $ — $ 637 $ — $ 637 Other mortgage-backed securities — 1,582 — 1,582 State and municipal securities — 680 — 680 Asset-backed securities — 1,913 — 1,913 Other investments — 45 — 45 Total trading securities $ — $ 4,857 $ — $ 4,857 Investment securities available for sale: U.S. Treasury securities $ 19,918 $ — $ — $ 19,918 U.S. Government agency securities — 74,856 — 74,856 Mortgage-backed securities issued by U.S. Government agencies — 55,422 — 55,422 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 5,549,825 — 5,549,825 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 628,880 — 628,880 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 335,737 — 335,737 State and municipal securities — 1,005 — 1,005 Asset-backed securities — 145,975 — 145,975 Corporate debt securities and other debt securities — 124,060 1,562 125,622 Total investment securities available for sale $ 19,918 $ 6,915,760 $ 1,562 $ 6,937,240 Mortgage loans held for sale — 119,841 — 119,841 Private equity investments 11,877 — 3,255 15,132 Mutual funds and mutual funds held in rabbi trusts 31,241 — — 31,241 GGL/SBA loans servicing asset — — 3,149 3,149 Derivative assets — 466,401 — 466,401 Liabilities Earnout liability $ — $ — $ 11,016 $ 11,016 Derivative liabilities — 184,021 2,050 186,071 December 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: Commercial mortgage-backed securities issued by U.S. Government sponsored enterprises $ — $ 2,486 $ — $ 2,486 Other mortgage-backed securities — 1,284 — 1,284 State and municipal securities — 65 — 65 Asset-backed securities — 3,227 — 3,227 Other investments — 150 — 150 Total trading securities $ — $ 7,212 $ — $ 7,212 Investment securities available for sale: U.S. Treasury securities $ 19,855 $ — $ — $ 19,855 U.S. Government agency securities — 36,541 — 36,541 Mortgage-backed securities issued by U.S. Government agencies — 56,816 — 56,816 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 5,180,815 — 5,180,815 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 636,851 — 636,851 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 371,592 — 371,592 State and municipal securities — 2,075 — 2,075 Asset-backed securities — 327,400 — 327,400 Corporate debt securities and other debt securities — 144,620 2,105 146,725 Total investment securities available for sale $ 19,855 $ 6,756,710 $ 2,105 $ 6,778,670 Mortgage loans held for sale — 115,173 — 115,173 Private equity investments 15,502 — 3,887 19,389 Mutual funds and mutual funds held in rabbi trusts 32,348 — — 32,348 GGL/SBA loans servicing asset — — 3,040 3,040 Derivative assets — 140,016 — 140,016 Liabilities Trading liability for short positions $ 1,560 $ — $ — $ 1,560 Earnout liability — — 11,016 11,016 Derivative liabilities — 34,732 2,339 37,071 Fair Value Option Synovus has elected the fair value option for mortgage loans held for sale primarily to ease the operational burden required to maintain hedge accounting for these loans. Synovus is still able to achieve effective economic hedges on mortgage loans held for sale without the time and expense needed to manage a hedge accounting program. The following table summarizes the difference between the fair value and the UPB of mortgage loans held for sale and the changes in fair value of these loans. An immaterial portion of these changes in fair value was attributable to changes in instrument-specific credit risk. Mortgage Loans Held for Sale (in thousands) As of March 31, 2020 As of December 31, 2019 Fair value $ 119,841 $ 115,173 Unpaid principal balance 116,268 112,218 Fair value less aggregate unpaid principal balance $ 3,573 $ 2,955 Changes in Fair Value Included in Net Income Three Months Ended March 31, (in thousands) 2020 2019 Mortgage loans held for sale $ 619 $ 356 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) During the three months ended March 31, 2020, Synovus did not have any transfers in or out of Level 3 in the fair value hierarchy. During t he three months ended March 31, 2019, Synovus had transfers out of Level 3 into Level 1 in the fair value hierarchy as certain funds within private equity investments became public with traded securities. Three Months Ended March 31, 2020 (in thousands) Investment Securities Available for Sale Private Equity Investments GGL / SBA Earnout Visa Derivative Beginning balance, December 31, 2019 $ 2,105 $ 3,887 $ 3,040 $ (11,016) $ (2,339) Total gains (losses) realized/unrealized: Included in earnings — (632) (264) — — Unrealized gains (losses) included in OCI (543) — — — — Additions — — 373 — — Settlements — — — — 289 Ending balance, March 31, 2020 $ 1,562 $ 3,255 $ 3,149 $ (11,016) $ (2,050) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets/liabilities still held at March 31, 2020 $ — $ (632) $ — $ — $ — Three Months Ended March 31, 2019 (in thousands) Investment Securities Available for Sale Private Equity Investments GGL / SBA Earnout Visa Derivative Beginning balance, December 31, 2018 $ 1,785 $ 11,028 $ 3,729 $ (14,353) $ (1,673) Total gains (losses) realized/unrealized: Included in earnings — 28 (488) — — Unrealized gains (losses) included in OCI 196 — — — — Additions — — 206 — — Settlements — — — — 307 Transfers out of Level 3 — (1,575) — — — Ending balance, March 31, 2019 $ 1,981 $ 9,481 $ 3,447 $ (14,353) $ (1,366) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets/liabilities still held at March 31, 2019 $ — $ 28 $ — $ — $ — 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. 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. March 31, 2020 (dollars in thousands) Valuation Technique Significant Unobservable Input Level 3 Fair Value Range / Weighted Average Assets measured at fair value on a recurring basis Investment Securities Available for Sale - Discounted cash flow analysis Discount rate $1,562 7.01% 3.56% 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 $3,255 N/A GGL/SBA loans servicing asset Discounted cash flow analysis Discount rate $3,149 12.16% 16.10% Earnout liability Option pricing methods and Monte Carlo simulation Financial projections of Global One $11,016 N/A Visa derivative liability Discounted cash flow analysis Estimated timing of resolution of covered litigation and future cumulative deposits to the litigation escrow for settlement of the Covered Litigation $2,050 0-2 years (4Q 2021) Assets Measured at Fair Value on a Non-recurring Basis Certain assets are required to be measured at fair value on a nonrecurring basis in periods subsequent to their initial recognition. These assets and liabilities are not measured at fair value on an ongoing basis; however, they are subject to fair value adjustments in certain circumstances, such as when there is evidence of impairment. The following table presents assets measured at fair value on a non-recurring basis as of the dates indicated for which there was a fair value adjustment during the period. March 31, 2020 December 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Other real estate $ — $ — $ 460 $ 460 $ — $ — $ 8,023 $ 8,023 MPS receivable — — 18,490 18,490 — — 21,437 21,437 Other assets held for sale — — 1,206 1,206 — — 1,238 1,238 ORE properties are included in other assets on the consolidated balance sheets. The carrying value of ORE at March 31, 2020 and December 31, 2019 was $15.2 million and $14.4 million, respectively. The following table presents fair value adjustments recognized in earnings for the three months ended March 31, 2020 and 2019 for assets measured at fair value on a non-recurring basis still held at period-end. Three Months Ended March 31, (in thousands) 2020 2019 Other real estate $ 5 $ 18 MPS receivable 2,663 — Other assets held for sale 1,391 96 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. March 31, 2020 Valuation Technique Significant Unobservable Input Range (Weighted Average) (1) Assets measured at fair value on a non-recurring basis Other real estate Third-party appraised value of real estate less estimated selling costs Discount to appraised value 0%-1% (1%) 0%-10% (7%) MPS receivable (2) Third-party appraised value of business less estimated selling costs Discount to appraised value N/A Other assets held for sale Third-party appraised value less estimated selling costs or BOV Discount to appraised value 0%-76% (58%) 0%-10% (7%) (1) The weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability. (2) See "Part I - Item 1. Notes to Unaudited Interim Financial Statements - Note 10 - Commitments and Contingencies" of this Report for more information on this receivable which was classified as a NPA at March 31, 2020 and December 31, 2019. Fair Value of Financial Instruments The following tables present the carrying and estimated fair values of financial instruments at March 31, 2020 and December 31, 2019. The fair values represent management’s best estimates based on a range of methodologies and assumptions. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies" to the consolidated financial statements of Synovus' 2019 Form 10-K for a description of how fair value measurements are determined. March 31, 2020 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets Total cash, cash equivalents, restricted cash, and restricted cash equivalents $ 1,823,834 $ 1,823,834 $ 1,823,834 $ — $ — Trading securities 4,857 4,857 — 4,857 — Investment securities available for sale 6,937,240 6,937,240 19,918 6,915,760 1,562 Mortgage loans held for sale 119,841 119,841 — 119,841 — Private equity investments 15,132 15,132 11,877 — 3,255 Mutual funds and mutual funds held in rabbi trusts 31,241 31,241 31,241 — — Loans, net 37,764,572 38,168,063 — — 38,168,063 GGL/SBA loans servicing asset 3,149 3,149 — — 3,149 Derivative assets 466,401 466,401 — 466,401 — Financial liabilities Non-interest-bearing deposits $ 9,659,451 $ 9,659,451 $ — $ 9,659,451 $ — Non-time interest-bearing deposits 21,305,350 21,305,350 — 21,305,350 — Time deposits 8,861,784 8,934,652 — 8,934,652 — Total deposits $ 39,826,585 $ 39,899,453 $ — $ 39,899,453 $ — Federal funds purchased and securities sold under repurchase agreements 312,776 312,776 312,776 — — Other short-term borrowings 1,175,000 1,175,000 — 1,175,000 — Long-term debt 3,152,339 3,122,480 — 3,122,480 — Earnout liability 11,016 11,016 — — 11,016 Derivative liabilities 186,071 186,071 — 184,021 2,050 December 31, 2019 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets Total cash, cash equivalents, restricted cash, and restricted cash equivalents $ 1,186,918 $ 1,186,918 $ 1,186,918 $ — $ — Trading securities 7,212 7,212 — 7,212 — Investment securities available for sale 6,778,670 6,778,670 19,855 6,756,710 2,105 Mortgage loans held for sale 115,173 115,173 — 115,173 — Private equity investments 19,389 19,389 15,502 — 3,887 Mutual funds and mutual funds held in rabbi trusts 32,348 32,348 32,348 — — Loans, net 36,881,048 36,931,256 — — 36,931,256 GGL/SBA loans servicing asset 3,040 3,040 — — 3,040 Derivative assets 140,016 140,016 — 140,016 — Financial liabilities Non-interest-bearing deposits $ 9,439,485 $ 9,439,485 $ — $ 9,439,485 $ — Non-time interest-bearing deposits 19,891,711 19,891,711 — 19,891,711 — Time deposits 9,074,308 9,112,459 — 9,112,459 — Total deposits $ 38,405,504 $ 38,443,655 $ — $ 38,443,655 $ — Federal funds purchased and securities sold under repurchase agreements 165,690 165,690 165,690 — — Trading liability for short positions 1,560 1,560 1,560 — — Other short-term borrowings 1,752,000 1,752,000 — 1,752,000 — Long-term debt 2,153,897 2,185,717 — 2,185,717 — Earnout liability 11,016 11,016 — — 11,016 Derivative liabilities 37,071 37,071 — 34,732 2,339

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2020
Summary of Derivative Instruments [Abstract]
Derivative Instruments and Hedging Activities	Note 8 - Derivative Instruments and Hedging Activities Synovus utilizes derivative instruments to manage its exposure to various types of interest rate risk, exposures related to liquidity and credit risk, and to facilitate customer transactions. The primary types of derivative instruments utilized by Synovus consist of interest rate swaps, interest rate lock commitments made to prospective mortgage loan customers, commitments to sell fixed-rate mortgage loans, and foreign currency exchange forwards. Interest rate lock commitments represent derivative instruments since it is intended that such loans will be sold. 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. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies" to the consolidated financial statements of Synovus' 2019 Form 10-K for additional information regarding accounting policies for derivatives. Hedging Derivatives Cash flow hedge relationships mitigate exposure to the variability of future cash flows or other forecasted transactions. Synovus has entered into interest rate swap contracts to manage overall cash flow changes related to interest rate risk exposure on index-based variable rate commercial loans. The contracts effectively modify Synovus' exposure to interest rate risk by utilizing receive fixed/pay index-based variable rate interest rate swaps. For cash f low hedges, the effective portion of the gain or loss related to the derivative instrument is initially reported as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnin gs or when the hedge is terminated and included in the same income statement line item as the earnings effect of the hedged item . Synovus recorded an unrealized gain of $9.8 million, or $7.3 million after-tax, in OCI, during the three months ended March 31, 2020, related to terminated cash flow hedges, which will be amortized into earnings in conjunction with the effective terms of the original swaps through the third quarter of 2025. Synovus recognized pre-tax income of $120 thousand during the three months ended March 31, 2020 related to the amortization of terminated cash flow hedges. As of March 31, 2020, Synovus expects to reclassify approximately $32 million of pre-tax gains from AOCI into interest income on cash flow hedges over the next twelve months. Included in this amount is approximately $3 million in pre-tax gains related to the amortization of terminated cash flow hedges. As of March 31, 2020, the maximum length of time over which Synovus is hedging its exposure to the variability in future cash flows is through the first quarter of 2024. For derivative instruments that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately. 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 s eeks 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. 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 March 31, 2020 and December 31, 2019, collateral totaling $157.8 million and $84.6 million, respectively, was pledged to the derivative counterparties to comply with collateral requirements. For derivatives cleared through central clearing houses, the variation margin payments made are legally characterized as settlements of the derivatives. As a result, these variation margin payments are netted against the fair value of the respective derivative contracts in the consolidated balance sheets and related disclosures. At March 31, 2020 and December 31, 2019, Synovus had a variation margin of $193.4 million and $113.7 million respectively, each reducing the derivative liability. The following table reflects the notional amount and fair value of derivative instruments included on the consolidated balance sheets. March 31, 2020 December 31, 2019 Fair Value Fair Value (in thousands) Notional Amount Derivative Assets (1) Derivative Liabilities (2) Notional Amount Derivative Assets (1) Derivative Liabilities (2) Derivatives in cash flow hedging relationships: Interest rate contracts $ 2,750,000 $ 90,246 $ — $ 2,000,000 $ 54 $ 8,624 Total derivatives designated as hedging instruments $ 90,246 $ — $ 54 $ 8,624 Derivatives not designated Interest rate contracts (3) $ 8,260,884 $ 367,841 $ 178,496 $ 7,258,159 $ 138,672 $ 25,849 Mortgage derivatives - interest rate lock commitments 412,218 8,314 — 70,481 1,290 — Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans 330,000 — 5,097 107,000 — 168 Other contracts (4) 159,412 — 428 145,764 — 91 Visa derivative — — 2,050 — — 2,339 Total derivatives not designated as hedging instruments $ 376,155 $ 186,071 $ 139,962 $ 28,447 (1) Derivative assets are recorded in other assets on the consolidated balance sheets. (2) Derivative liabilities are recorded in other liabilities on the consolidated balance sheets. (3) Includes interest rate contracts for customer swaps and offsetting positions, net of variation margin payments. (4) Includes risk participation agreements sold. Additionally, the notional amount of risk participation agreements purchased was $2.9 million and $3.0 million at March 31, 2020 and December 31, 2019, respectively. Synovus also provides foreign currency exchange services, primarily forward contracts, with counterparties to allow commercial customers to mitigate exchange rate risk. Synovus covers its risk by entering into an offsetting foreign currency exchange forward contract. The notional amount of foreign currency exchange forwards was $47.2 million and $32.9 million at March 31, 2020 and December 31, 2019, respectively. The fair value of foreign currency exchange forwards was negligible at March 31, 2020 and December 31, 2019 due to the very short duration of these contracts. The following table presents the effect of hedging derivative instruments on the consolidated statements of income and the total amounts for the respective line item affected for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, (in thousands) 2020 2019 Total amounts presented in the consolidated statements of income in interest income on loans $ 3,637 $ — Gain/loss on cash flow hedging relationships: (1) Interest rate swaps: Realized gains (losses) reclassified from AOCI, pre-tax, to interest income on loans 120 — Pre-tax income recognized on cash flow hedges $ 120 $ — (1) See "Part I - Item 1. Financial Statements and Supplementary Data - Note 6 - Shareholders' Equity and Other Comprehensive Income (Loss) in this Report for additional information. The pre-tax effect of changes in fair value from derivative instruments not designated as hedging instruments on the consolidated statements of income for the three months ended March 31, 2020 and 2019 is presented below. Gain (Loss) Recognized in Consolidated Statements of Income Three Months Ended March 31, (in thousands) Location in Consolidated Statements of Income 2020 2019 Derivatives not designated as hedging instruments: Interest rate contracts (1) Capital markets income $ (604) $ (130) Other contracts (2) Capital markets income (337) — Mortgage derivatives - interest rate lock commitments Mortgage banking income 7,024 693 Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans Mortgage banking income (4,929) 13 Total derivatives not designated as hedging instruments $ 1,154 $ 576 (1) Additionally, losses related to termination of customer swaps of $2.5 million were recorded in other non-interest expense for the three months ended March 31, 2020. (2) Includes risk participation agreements sold.

Net Income Per Common Share

Net Income Per Common Share	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Net Income Per Common Share	Note 9 - Net Income Per Common Share The following table displays a reconciliation of the information used in calculating basic and diluted earnings per common share for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, (in thousands, except per share data) 2020 2019 Basic Net Income Per Common Share: Net income available to common shareholders $ 30,230 $ 117,036 Weighted average common shares outstanding 147,311 160,927 Net income per common share, basic $ 0.21 $ 0.73 Diluted Net Income Per Common Share: Net income available to common shareholders $ 30,230 $ 117,036 Weighted average common shares outstanding 147,311 160,927 Effect of dilutive outstanding equity-based awards, warrants, and earnout payments 1,090 1,833 Weighted average diluted common shares 148,401 162,760 Net income per common share, diluted $ 0.20 $ 0.72 Basic net income per common share is computed by dividing net income available to common shareholders by the average common shares outstanding for the period. Diluted net income per common share reflects the dilution that could occur if securities or other contracts to issue common stock were exercised or converted. The dilutive effect of outstanding stock options, restricted share units, and warrants is reflected in diluted net income per common share, unless the impact is anti-dilutive, by application of the treasury stock method.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 10 - 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. Synovus also has commitments to fund certain low-income housing investments, solar energy, and CRA investments. 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 ACL associated with unfunded commitments and letters of credit is recorded within other liabilities on the consolidated balance sheets. Upon adoption of CECL on January 1, 2020, Synovus recorded $27.4 million in unfunded commitment reserves due to the consideration under CECL of expected utilization over the life of such commitments. At March 31, 2020, the ACL for unfunded commitments was $38.4 million, including the impact of CECL and COVID-19, compared to a reserve of $1.4 million at December 31, 2019. Additionally, an immaterial amount of unearned fees relating to letters of credit are recorded within other liabilities on the consolidated balance sheets. See "Part I-Item 1. Financial Statements and Supplementary Data - Note 1 - Basis of Presentation" in this Report for more information on Synovus' adoption of CECL. Synovus invests in certain LIHTC partnerships which are engaged in the development and operation of affordable multi-family housing pursuant to Section 42 of the Code. Additionally, Synovus invests in certain solar energy tax credit partnerships pursuant to Section 48 of the Code. Synovus typically acts as a limited partner in these investments and does not exert control over the operating or financial policies of the partnerships and as such, is not considered the primary beneficiary of the partnership. For certain of its LIHTC investments, Synovus provides financing during the construction and development of the properties and is at risk for the funded amount of its equity investment plus the outstanding amount of any construction loans in excess of the fair value of the collateral for the loan, but has no obligation to fund the operations or working capital of the partnerships and is not exposed to losses beyond Synovus’ investment. Synovus receives tax credits related to these investments which are subject to recapture by taxing authorities based on compliance provisions required to be met at the project level. Synovus also invests in certain other CRA partnerships including SBIC programs. The SBIC is a program initiated by the SBA in 1958 to assist in the funding of small business loans. (in thousands) March 31, 2020 December 31, 2019 Letters of credit* $ 182,629 $ 202,614 Commitments to fund commercial and industrial loans 6,994,969 7,018,152 Commitments to fund commercial real estate, construction, and land development loans 2,925,791 3,032,252 Commitments under home equity lines of credit 1,508,176 1,501,452 Unused credit card lines 940,016 877,929 Other loan commitments 469,958 485,371 Total letters of credit and unfunded lending commitments $ 13,021,539 $ 13,117,770 Investments in low income housing, solar energy tax credit, and other CRA partnerships: Carrying amount included in other assets $ 166,460 $ 146,612 Amount of future funding commitments included in carrying amount 93,749 78,266 Short-term construction loans and letter of credit commitments 792 2,124 Funded portion of short-term loans and letters of credit 4,516 3,196 * Represent the contractual amount net of risk participations purchased of approximately $32 million and $33 million at March 31, 2020 and December 31, 2019, respectively. Merchant Services In accordance with credit and debit card association rules, Synovus sponsors various MPS businesses that process credit and debit card transactions on behalf of merchants. In connection with these services, a liability may arise in the event of a billing dispute between the merchant and a cardholder that is ultimately resolved in the cardholder's favor. If the merchant defaults on its obligations, the cardholder, through its issuing bank, generally has until six months after the date of the transaction to present a chargeback to the MPS, which is primarily liable for any losses on covered transactions. However, if the MPS fails to meet its obligations, then Synovus, as the sponsor, could be held liable for the disputed amount. Synovus seeks to mitigate this risk through its contractual arrangements with the MPS and the merchants by withholding future settlements, retaining cash reserve accounts and/or obtaining other security. For the three months ended March 31, 2020 and 2019, the sponsored entities processed and settled $18.37 billion and $17.71 billion of transactions, respectively. Synovus covered chargebacks related to a particular MPS during 2019 and 2018 where the MPS’s cash reserve account was unavailable to support the chargebacks. As of March 31, 2020, the remaining amount due to Synovus from the MPS is $21.2 million, compared to $21.4 million at December 31, 2019. During the three months ended March 31, 2020, Synovus recorded a $2.7 million reserve in other operating expenses associated with the chargebacks, reflecting the amount that Synovus does not expect to collect. The net balance of $18.5 million at March 31, 2020 is included in other assets and classified in NPAs. While Synovus has contractual protections to mitigate against loss, repayment of the amounts owed to Synovus will depend in large part upon the continued financial viability and/or valuation of the MPS and the availability of any cash reserve accounts. Legal Proceedings Synovus and its subsidiaries are subject to various legal proceedings, claims and disputes 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 legal actions and other proceedings asserting claims for damages and related relief for losses. These actions include mortgage loan and other loan put-back claims, claims and counterclaims asserted by individual borrowers related to their loans, allegations of violations of state and federal laws and regulations relating to banking practices, and allegations related to Synovus' participation in government stimulus programs, including putative class action matters. In addition to actual damages, if Synovus does not prevail in such asserted legal actions, credit-related litigation could result in additional write-downs or charge-offs of assets, which could adversely affect Synovus' results of operations during the period in which the write-down or charge-off 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 reserve. An event is considered to be probable if the future event is likely to occur. While the final outcome of any legal proceeding is inherently uncertain, based on the information currently available, advice of counsel and available insurance coverage, management believes that the amounts accrued with respect to legal matters as of March 31, 2020 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 future event or events 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 $5 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 lower or 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 or financial condition for any particular period.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Segment Reporting	Note 11 - Segment Reporting Synovus' business segments are based on the products and services provided or the customers served, and as of the fourth quarter of 2019, reflect the manner in which financial information is evaluated by the chief operating decision maker. Prior to the fourth quarter of 2019, Synovus identified its overall banking operations as its only reportable segment. Synovus has three major reportable business segments: Community Banking, Wholesale Banking, and Financial Management Services (FMS), with functional activities such as treasury, technology, operations, marketing, finance, enterprise risk, legal, human resources, corporate communications, executive management, among others, included in Treasury and Corporate Other. Business segment results are determined based upon Synovus' management reporting system, which assigns balance sheet and income statement items to each of the business segments. Certain assets, liabilities, revenues, and expenses not allocated or attributable to a particular business segment are included in Treasury and Corporate Other. The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to GAAP. As a result, reported segment results are not necessarily comparable with similar information reported by other financial institutions. The Community Banking business segment serves customers using a relationship-based approach through its branch, ATM, commercial, and private wealth network in addition to mobile, Internet, and telephone banking. This segment primarily provides individual, small business, and corporate customers with an array of comprehensive banking products and services including commercial, home equity, and other consumer loans, credit and debit cards, and deposit accounts. The Wholesale Banking business segment serves primarily larger corporate customers by providing commercial lending and deposit services through specialty teams including middle market, CRE, senior housing, national accounts, premium finance, structured lending, healthcare, and asset-based lending. The Financial Management Services (FMS) business segment serves its customers by providing mortgage and trust services and also specializing in professional portfolio management for fixed-income securities, investment banking, the execution of securities transactions as a broker/dealer, asset management, and financial planning services, as well as the provision of individual investment advice on equity and other securities. Synovus uses a centralized FTP methodology to attribute appropriate net interest income to the business segments. The intent of the FTP methodology is to transfer interest rate risk from the business segments by providing matched duration funding of assets and liabilities. The result is to centralize the financial impact, management, and reporting of interest rate risk in the Treasury and Corporate Other function where it can be centrally monitored and managed. Treasury and Corporate Other charges (credits) an internal cost of funds for assets held in (or pays for funding provided by) each business segment. The FTP rate is based on prevailing market interest rates for comparable duration assets (or liabilities). The following table presents certain financial information for each reportable business segment for the first quarter of 2020. To provide comparable information, Synovus has included proforma business segment financial information for the first quarter of 2019 utilizing various allocation methodologies based on balance sheet and income statement items assigned to each business segment. The application and development of management reporting methodologies is a dynamic process and is subject to periodic enhancements. As these enhancements are made, financial results presented by each reportable business segment may be periodically revised. (in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated First Quarter 2020 Net interest income $ 197,246 $ 123,170 $ 16,782 $ 36,062 $ 373,260 Non-interest revenue 33,449 9,256 47,275 13,877 103,857 Non-interest expense 75,304 18,202 43,289 139,484 276,279 Pre-provision net revenue $ 155,391 $ 114,224 $ 20,768 $ (89,545) $ 200,838 (in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated First Quarter 2019 Proforma Net interest income $ 214,759 $ 125,611 $ 28,865 $ 27,940 $ 397,175 Non-interest revenue 32,776 6,758 32,279 7,565 79,378 Non-interest expense 74,816 15,019 33,218 169,357 292,410 Pre-provision net revenue $ 172,719 $ 117,350 $ 27,926 $ (133,852) $ 184,143 March 31, 2020 (dollars in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated Total loans net of deferred fees and costs $ 12,224,112 $ 18,691,302 $ 5,344,276 $ 1,998,334 $ 38,258,024 Total deposits 25,364,034 9,111,207 266,839 5,084,505 39,826,585 Total full-time equivalent employees 2,291 237 838 1,936 5,302 December 31, 2019 (dollars in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated Total loans net of deferred fees and costs $ 12,170,914 $ 17,643,509 $ 5,285,455 $ 2,062,572 $ 37,162,450 Total deposits 25,610,777 8,314,184 284,716 4,195,827 38,405,504 Total full-time equivalent employees 2,301 213 839 1,911 5,264

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2020
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' 2019 Form 10-K.
Reclassifications	Prior periods' consolidated financial statements are reclassified whenever necessary to conform to the current periods' presentation.
Use of Estimates in the Preparation of Financial Statements	In preparing the 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 change relate to the determination of the ACL; estimates of fair value, including goodwill impairment assessment; income taxes; and contingent liabilities including legal matters, among others.
Recently Adopted Accounting Standards and Recently Issued Accounting Standards Not Yet Adopted	Recently Adopted Accounting Standards ASU 2016-13, Financial Instruments-Credit Losses (ASC 326). On January 1, 2020, Synovus adopted ASU 2016-13 (and all subsequent ASUs on this topic), which replaces the existing incurred loss impairment guidance with an expected credit loss methodology (referred to as CECL). CECL requires management’s estimate of credit losses over the full remaining expected life of loans and other financial instruments and for Synovus, applies to loans, unfunded loan commitments, and available for sale debt securities. Upon adoption, Synovus applied the modified retrospective approach and recorded an after-tax cumulative-effect adjustment to beginning retained earnings for non-PCD assets (formerly non-PCI assets) and unfunded commitments of $35.7 million. Additionally, an initial estimate of expected credit losses on PCD assets (formerly PCI or ASC 310-30) was recognized with an offset to the cost basis of the related loans of $62.2 million. As permitted by transition guidance, Synovus did not reassess whether PCI assets met the criteria of PCD assets as of the adoption date. The remaining non-credit discount (based on the adjusted amortized cost basis) will be accreted into interest income. Results for reporting periods after adoption are presented under ASC 326 while prior period amounts continue to be reported in accordance with previously applicable GAAP. The following table illustrates the impact of ASC 326 adoption: As of January 1, 2020 in thousands Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported under ASC 326 Assets Allowance for loan losses: Commercial and industrial $ 145,782 $ (2,310) $ 143,472 Commercial real estate 67,430 (651) 66,779 Consumer 68,190 85,955 154,145 Total allowance for loan losses $ 281,402 $ 82,994 $ 364,396 Liabilities Reserve for unfunded commitments $ 1,375 $ 27,440 $ 28,815 Allowance for credit losses $ 282,777 $ 110,434 $ 393,211 The following table illustrates the distribution of the ASC 326 adoption impact to loans and equity: As of January 1, 2020 in thousands Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported under ASC 326 Loans, net $ 36,881,048 $ (20,767) $ 36,860,281 Retained earnings 1,068,327 (35,721) 1,032,606 On March 27, 2020, the federal banking regulators issued an interim final rule, updating CECL transition options, which allows electing banking organizations to delay an estimate of the effect of CECL on regulatory capital for up to two years, followed by a three-year phase-in transition period. March 31, 2020 regulatory capital ratios reflect Synovus' election of the five-year transition provision. In conjunction with the adoption of ASC 326, the following are additional disclosures about our significant accounting policies related to CECL. Recently Issued Accounting Standards Not Yet Adopted ASU 2020-04, Reference Rate Reform: Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASC 848). Facilitation of the Effects of Reference Rate Reform on Financial Reporting, provides temporary, optional guidance to ease the potential burden in accounting for, or recognizing the effects of, the transition away from the LIBOR or other interbank offered rate on financial reporting. To help with the transition to new reference rates, the ASU provides optional expedients and exceptions for applying GAAP to affected contract modifications and hedge accounting relationships. The main provisions include: • A change in a contract’s reference interest rate would be accounted for as a continuation of that contract rather than as the creation of a new one for contracts, including loans, debt, leases, and other arrangements, that meet specific criteria. • When updating its hedging strategies in response to reference rate reform, an entity would be allowed to preserve its hedge accounting. The guidance is applicable only to contracts or hedge accounting relationships that reference LIBOR or another reference rate expected to be discontinued. Because the guidance is meant to help entities through the transition period, it will be in effect for a limited time and will not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship. The amendments in this ASU are effective March 12, 2020 through December 31, 2022. We are evaluating the impact of adopting the new guidance on the consolidated financial statements on an ongoing basis with no material expected impac t at this time.
Investment Securities Available for Sale	Investment securities available for sale are carried at fair value with unrealized gains and losses, net of the related tax effect, excluded from earnings and reported as a separate component of shareholders' equity within accumulated other comprehensive income (loss) until realized. For investment securities available for sale in an unrealized loss position, if Synovus has an intention to sell the security or it is more likely than not that the security will be required to be sold prior to recovery, the security is written down to its fair value. The write down is charged against the ACL with any additional impairment recorded in earnings. If the aforementioned criteria is not met, Synovus performs a quarterly assessment of its available for sale debt securities to determine if the decline in fair value of a security below its amortized cost is related to credit losses or other factors. Management cons iders the extent to which fair value is less than amortized cost, the issuer of the security, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. In assessing whether credit related impairment exists, the present value of cash flows expected to be collected from the security is compared to the security's amortized cos t. If the present value of cash flows expected to be collected is less than the security's amortized cost basis, the difference is attributable to credit losses. For such differences, Synovus records an allowance for credit losses ("ACL") with an offset to provision for credit losses expense. Synovus limits the ACL recorded to the amount the security's fair value is less than the amortized cost basis. Impairment losses related to other factors are recognized in other comprehensive income (loss). Accrued interest on available for sale debt securities is excluded from the ACL determination and is recognized within other assets on the consolidated balance sheets. Available-for-sale debt securities are placed on non-accrual status when we no longer expect to receive all contractual amounts due, which is generally at 90 days past due. Accrued interest receivable is reversed against interest income when a security is placed on non-accrual status. Accordingly, we do not recognize an allowance for credit loss against accrued interest receivable.
Loans and Interest Income	Loans the Company has the intent and ability to hold for the foreseeable future are reported at principal amounts outstanding less amounts charged off, net of deferred fees and costs, and purchase premiums/discounts. Interest income, net deferred fees, and purchase premium/discount amortization/accretion on loans, are recognized on a level yield basis. Allowance for Credit Losses for Loans Held for Investment The allowance for credit losses on loans held for investment are included in the ALL and represent management's estimate of credit losses expected over the life of the loans included in Synovus' existing loans held for investment portfolio. Changes to the allowance are recorded through a provision for credit losses and reduced by loans charged-off, net of recoveries. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. Accrued but uncollected interest is recorded in other assets on the consolidated balance sheets. The Company elected not to measure an ACL for accrued interest receivables as allowable per ASC 326-20-30-5A as Synovus' non-accrual policies result in the timely write-off of accrued but uncollected interest. Credit loss measurement Synovus' loan loss estimation process includes procedures to appropriately consider the unique characteristics of its loan portfolio segments (commercial and industrial ("C&I"), commercial real estate ("CRE") and consumer). These segments are further disaggregated into loan classes, the level at which credit quality is assessed and monitored (as described in the subsequent sections). The ALL is measured on a collective (pool) basis when similar risk characteristics exist. Loans are grouped based upon the nature of the loan type and are further segregated based upon the individual loan risk ratings. Credit loss assumptions are primarily estimated using a discounted cash flow ("DCF") model applied to the aforementioned loan groupings. This model calculates an expected life-of-loan loss percentage for each loan category by considering the forecasted PD, which is the probability that a borrower will default, adjusted for relevant forecasted macroeconomic factors, and LGD, which is the estimate of the amount of net loss in the event of default. Expected credit losses are estimated over the contractual term of the loan, adjusted for expected prepayments and curtailments when appropriate. Management's determination of the contract term excludes expected extensions, renewals, and modifications unless either of the following applies: there is a reasonable expectation at the reporting date that a TDR will be executed with an individual borrower or the extension or renewal option is included in the contract at the reporting date and is not unconditionally cancellable by Synovus. To the extent the lives of the loans in the portfolio extend beyond the period for which a reasonable and supportable forecast can be made (which is 1 year for Synovus), the Company reverts, on a straight-line basis back to the historical rates. Life-of-loan loss percentages may also be adjusted, as necessary, for certain quantitative and qualitative factors that in management's judgment are necessary to reflect losses expected in the portfolio. These adjustments address inherent limitations in the quantitative model including uncertainty and limitations, among others. The above reflects the ALL estimation process for most commercial and consumer sub-pools. In some cases, Synovus may apply other acceptable loss rate models (as permitted by policy) to smaller subpools. Loans that do not share risk characteristics are individually evaluated on a loan by loan basis with specific reserves, if any, recorded as appropriate. Specific reserves are determined based on two methods: discounted cash flow based upon the loan's contractual effective interest rate or at the fair value of the collateral, less costs to sell if the loan is collateral-dependent. Under the discounted cash flow method, resulting expected credit losses are recorded as a specific reserve with a charge-off for any portion of the expected credit loss that is determined not to be recoverable. The reserve is reassessed each quarter and adjusted as appropriate based on changes in estimated cash flows. Additionally, where guarantors are determined to be a source of repayment, an assessment of the guarantee is required. This guarantee assessment would include, but not be limited to, factors such as type and feature of the guarantee, consideration for the guarantor's financial strength and capacity to service the loan in combination with the guarantor's other financial obligations as well as the guarantor's willingness to assist in servicing the loan. If the loan is collateral-dependent, then the fair value of the loan's collateral, less estimated selling costs, is compared to the loan's carrying amount to determine impairment. Fair value is estimated using appraisals performed by a certified or licensed appraiser. Management also considers other factors or recent developments, such as changes in absorption rates or market conditions at the time of valuation, selling costs and anticipated sales values, taking into account management's plans for disposition, which could result in adjustments to the fair value estimates indicated in the appraisals. The assumptions used in determining the amount of the impairment are subject to significant judgment. Use of different assumptions, for example, changes in the fair value of the collateral or management's plans for disposition could have a significant impact on the amount of impairment. Troubled debt restructurings The ALL on a TDR is measured using the same method as all other loans held for investment, except that the original interest rate, and not the rate specified with the restructuring, is used to discount the expected cash flows. Purchased Loans with Credit Deterioration Purchased loans are evaluated upon acquisition in order to determine if the loan or pool of loans has experienced more-than-insignificant deterioration in credit quality since origination or issuance. In the performance of this evaluation, Synovus considers migration of the credit quality of the loans at origination in comparison to the credit quality at acquisition. Purchased loans classified as PCD are recognized in accordance with ASC 326-20-30, whereby the amortized cost basis of the PCD asset is ‘grossed-up’ by the initial estimate of credit losses with an offset to the ALL. This acquisition date allowance has no income statement effect. Post-acquisition, any changes in estimates of expected credit losses are recorded through the provision for credit losses. Non-credit discounts or premiums are accreted or amortized, respectively into interest income using the interest method. Loans formerly accounted for as purchased credit-impaired in accordance with ASC 310-30 were automatically transitioned to PCD classification. The Company did not maintain ASC 310-30 pools. PCD loans were integrated into existing pool structures based upon the nature of the loan type and are further segregated based upon the individual loan risk ratings as noted above. The accounting treatment for purchased loans classified as non-PCD is the same as loans held for investment as detailed in the above section. Allowance for Credit Losses on Off-balance-sheet Credit Exposures Synovus maintains a separate ACL for off-balance-sheet credit exposures, including unfunded loan commitments, unless the associated obligation is unconditionally cancellable by the Company. This allowance is included in other liabilities on the consolidated balance sheets with offsetting expense recognized as a component of the provision for credit losses on the consolidated statements of income. The reserve for off-balance-sheet credit exposures considers the likelihood that funding will occur and estimates the expected credit losses on resulting commitments expected to be funded over its estimated life.

Basis of Presentation and Acc_3

Basis of Presentation and Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table illustrates the impact of ASC 326 adoption: As of January 1, 2020 in thousands Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported under ASC 326 Assets Allowance for loan losses: Commercial and industrial $ 145,782 $ (2,310) $ 143,472 Commercial real estate 67,430 (651) 66,779 Consumer 68,190 85,955 154,145 Total allowance for loan losses $ 281,402 $ 82,994 $ 364,396 Liabilities Reserve for unfunded commitments $ 1,375 $ 27,440 $ 28,815 Allowance for credit losses $ 282,777 $ 110,434 $ 393,211 The following table illustrates the distribution of the ASC 326 adoption impact to loans and equity: As of January 1, 2020 in thousands Pre-ASC 326 Adoption Impact of ASC 326 Adoption As Reported under ASC 326 Loans, net $ 36,881,048 $ (20,767) $ 36,860,281 Retained earnings 1,068,327 (35,721) 1,032,606

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Schedule of Acquisition Related Costs	In connection with the FCB acquisition, Synovus incurred merger-related expense presented in the table below totaling $49.7 million for the three months ended March 31, 2019, primarily related to employment compensation agreements, severance, professional services, and contract termination charges: (in thousands) Three Months Ended March 31, 2019 Employment compensation agreements, severance, and other employee benefit costs $ 32,988 Professional fees 15,200 All other expense (1) 1,550 Total merger-related expense $ 49,738 (1) Primarily relates to fees associated with lease exit accruals, asset impairments related to the integration, and contract termination charges.

Investment Securities Availab_2

Investment Securities Available for Sale (Tables)	3 Months Ended
	Mar. 31, 2020
Investments [Abstract]
Summary of Available-for-Sale Investment Securities	The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities available for sale at March 31, 2020 and December 31, 2019 are summarized below. March 31, 2020 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 19,918 $ — $ — $ 19,918 U.S. Government agency securities 72,424 2,469 (37) 74,856 Mortgage-backed securities issued by U.S. Government agencies 53,557 1,866 (1) 55,422 Mortgage-backed securities issued by U.S. Government sponsored enterprises 5,312,698 237,127 — 5,549,825 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 601,585 27,297 (2) 628,880 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises 311,235 24,502 — 335,737 State and municipal securities 1,007 2 (4) 1,005 Asset-backed securities 154,954 150 (9,129) 145,975 Corporate debt securities and other debt securities 129,376 921 (4,675) 125,622 Total investment securities available for sale $ 6,656,754 $ 294,334 $ (13,848) $ 6,937,240 December 31, 2019 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 19,855 $ — $ — $ 19,855 U.S. Government agency securities 35,499 1,042 — 36,541 Mortgage-backed securities issued by U.S. Government agencies 56,328 560 (72) 56,816 Mortgage-backed securities issued by U.S. Government sponsored enterprises 5,079,396 103,495 (2,076) 5,180,815 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 629,706 7,349 (204) 636,851 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises 357,291 14,301 — 371,592 State and municipal securities 2,069 6 — 2,075 Asset-backed securities 323,237 4,315 (152) 327,400 Corporate debt securities and other debt securities 144,410 2,317 (2) 146,725 Total investment securities available for sale $ 6,647,791 $ 133,385 $ (2,506) $ 6,778,670
Schedule of Gross Unrealized Losses on Investment Securities and Fair Value	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2020 and December 31, 2019 are presented below. March 31, 2020 Less than 12 Months 12 Months of Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses U.S. Government agency securities $ 38,502 $ (37) $ — $ — $ 38,502 $ (37) Mortgage-backed securities issued by U.S. Government agencies 6 (1) — — 6 (1) Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 320 (1) 32 (1) 352 (2) State and municipal securities 503 (4) — — 503 (4) Asset-backed securities 140,993 (9,129) — — 140,993 (9,129) Corporate debt securities and other debt securities 105,446 (4,675) — — 105,446 (4,675) Total $ 285,770 $ (13,847) $ 32 $ (1) $ 285,802 $ (13,848) December 31, 2019 Less than 12 Months 12 Months of Longer Total (in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Mortgage-backed securities issued by U.S. Government agencies $ 19,543 $ (70) $ 355 $ (2) $ 19,898 $ (72) Mortgage-backed securities issued by U.S. Government sponsored enterprises 768,040 (2,076) — — 768,040 (2,076) Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 57,670 (204) — — 57,670 (204) Asset-backed securities 37,156 (116) 4,954 (36) 42,110 (152) Corporate debt securities and other debt securities 9,505 (2) — — 9,505 (2) Total $ 891,914 $ (2,468) $ 5,309 $ (38) $ 897,223 $ (2,506)
Amortized Cost and Estimated Fair Value by Contractual Maturity of Investment Securities Available-for-Sale	For purposes of the maturity table, mortgage-backed securities and CMOs, which are not due at a single maturity date, have been classified based on the final contractual maturity date. Distribution of Maturities at March 31, 2020 (in thousands) Within One 1 to 5 5 to 10 More Than Total Amortized Cost U.S. Treasury securities $ 19,918 $ — $ — $ — $ 19,918 U.S. Government agency securities 568 3,367 43,501 24,988 72,424 Mortgage-backed securities issued by U.S. Government agencies — 1,542 803 51,212 53,557 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 517 86,523 5,225,658 5,312,698 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 296 601,289 601,585 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 109,774 116,210 85,251 311,235 State and municipal securities — — — 1,007 1,007 Asset-backed securities — — 154,954 — 154,954 Corporate debt securities and other debt securities 24,127 94,619 8,630 2,000 129,376 Total amortized cost $ 44,613 $ 209,819 $ 410,917 $ 5,991,405 $ 6,656,754 Fair Value U.S. Treasury securities $ 19,918 $ — $ — $ — $ 19,918 U.S. Government agency securities 578 3,426 45,897 24,955 74,856 Mortgage-backed securities issued by U.S. Government agencies — 1,588 831 53,003 55,422 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 536 92,059 5,457,230 5,549,825 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 309 628,571 628,880 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 116,257 129,175 90,305 335,737 State and municipal securities — — — 1,005 1,005 Asset-backed securities — — 145,975 — 145,975 Corporate debt securities and other debt securities 24,068 92,574 7,418 1,562 125,622 Total fair value $ 44,564 $ 214,381 $ 421,664 $ 6,256,631 $ 6,937,240
Schedule of Sales Activities of Available-for-Sale Securities	Proceeds from sales, gross gains, and gross losses on sales of securities available for sale for the three months ended March 31, 2020 and 2019 are presented below. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale. Three Months Ended March 31, (in thousands) 2020 2019 Proceeds from sales of investment securities available for sale $ 413,180 $ 1,642,239 Gross realized gains on sales 8,734 9,130 Gross realized losses on sales — (9,055) Investment securities gains, net $ 8,734 $ 75

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2020
Loans and Allowance for Loan Losses [Abstract]
Schedule of Current, Accruing Past Due, and Non-accrual Loans	The following tables provide a summary of current, accruing past due, and non-accrual loans by portfolio class as of March 31, 2020 and December 31, 2019. Current, Accruing Past Due, and Non-accrual Loans March 31, 2020 (in thousands) Current Accruing 30-89 Days Past Due (1) Accruing 90 Days or Greater Past Due (1) Total Accruing Past Due (1) Non-accrual with an ALL (1) Non-accrual without an ALL (1) Total Commercial, financial and agricultural $ 10,896,890 $ 21,149 $ 829 $ 21,978 $ 78,263 $ 21,024 $ 11,018,155 Owner-occupied 6,614,799 10,279 852 11,131 7,718 9,639 6,643,287 Total commercial and industrial 17,511,689 31,428 1,681 33,109 85,981 30,663 17,661,442 Investment properties 9,252,438 3,056 85 3,141 2,212 — 9,257,791 1-4 family properties 744,451 4,636 56 4,692 2,325 — 751,468 Land and development 658,624 976 142 1,118 1,935 265 661,942 Total commercial real estate 10,655,513 8,668 283 8,951 6,472 265 10,671,201 Consumer mortgages 5,583,714 10,836 — 10,836 13,017 554 5,608,121 Home equity lines 1,759,571 5,873 943 6,816 12,475 — 1,778,862 Credit cards 256,445 2,465 2,671 5,136 — — 261,581 Other consumer loans 2,277,102 17,567 820 18,387 6,860 — 2,302,349 Total consumer 9,876,832 36,741 4,434 41,175 32,352 554 9,950,913 Total loans $ 38,044,034 $ 76,837 $ 6,398 $ 83,235 $ 124,805 $ 31,482 $ 38,283,556 (2) December 31, 2019 (in thousands) Current Accruing 30-89 Days Past Due Accruing 90 Days or Greater Past Due Total Accruing Past Due Non-accrual ASC 310-30 Loans (3) Total Commercial, financial and agricultural $ 9,137,585 $ 38,916 $ 1,206 $ 40,122 $ 56,017 $ 1,019,135 $ 10,252,859 Owner-occupied 5,691,095 5,164 576 5,740 9,780 823,196 6,529,811 Total commercial and industrial 14,828,680 44,080 1,782 45,862 65,797 1,842,331 16,782,670 Investment properties 7,303,146 1,344 — 1,344 1,581 1,736,608 9,042,679 1-4 family properties 733,984 2,073 304 2,377 2,253 41,401 780,015 Land and development 577,711 808 — 808 1,110 78,161 657,790 Total commercial real estate 8,614,841 4,225 304 4,529 4,944 1,856,170 10,480,484 Consumer mortgages 3,681,553 4,223 730 4,953 11,369 1,848,493 5,546,368 Home equity lines 1,691,759 7,038 171 7,209 12,034 2,155 1,713,157 Credit cards 263,065 3,076 2,700 5,776 — — 268,841 Other consumer loans 2,363,101 18,688 616 19,304 5,704 8,185 2,396,294 Total consumer 7,999,478 33,025 4,217 37,242 29,107 1,858,833 9,924,660 Total loans $ 31,442,999 $ 81,330 $ 6,303 $ 87,633 $ 99,848 $ 5,557,334 $ 37,187,814 (4) (1) For purposes of this table, non-performing and past due loans exclude COVID-19 loan modifications. (2) Total before net deferred fees and costs of $25.5 million. (3) Represents loans (at fair value) acquired from FCB accounted for under ASC 310-30, net of discount of $90.3 million and payments since Acquisition Date and also include $1.8 million in non-accrual loans, $9.6 million in accruing 90 days or greater past due loans, and $26.5 million in 30-89 days past due loans. (4) Total before net deferred fees and costs of $25.4 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 Retail Credit Classification Policy. Additionally, in accordance with Interagency Supervisory Guidance, the risk grade classifications of consumer loans (consumer mortgages and HELOCs) 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. The risk characteristics and collateral information of each portfolio segment are as follows: Commercial and Industrial Loans The C&I loan portfolio is comprised of general middle market and commercial banking clients across a diverse set of industries. In accordance with Synovus' lending policy, each loan undergoes a detailed underwriting process which incorporates uniform underwriting standards and oversight in proportion to the size and complexity of the lending relationship. These loans are secured by collateral such as business equipment, inventory, and real estate. Whether for real estate or non-real estate purpose, credit decisions on loans in the C&I portfolio are based on cash flow from the operations of the business as the primary source of repayment of the debt, with underlying real estate or other collateral being the secondary source of repayment . Commercial Real Estate Loans CRE loans primarily consist of income-producing investment properties loans. Additionally, CRE loans include 1-4 family properties loans as well as land and development loans. Investment properties loans consist of construction and mortgage loans for income-producing properties and are primarily made to finance multi-family properties, hotels, office buildings, shopping centers, warehouses and other commercial development properties. 1-4 family properties loans include construction loans to homebuilders and commercial mortgage loans related to 1-4 family rental properties and are almost always secured by the underlying property being financed by such loans. These properties are primarily located in the markets served by Synovus. Land and development loans include commercial and residential development as well as land acquisition loans and are secured by land held for future development, typically in excess of one year. Properties securing these loans are substantially within markets served by Synovus, and loan terms generally include personal guarantees from the principals. Loans in this portfolio are underwritten based on the LTV of the collateral and the capacity of the guarantor(s). Consumer Loans The consumer loan portfolio consists of a wide variety of loan products offered through Synovus' banking network including first and second residential mortgages, HELOCs, and credit card loans, as well as home improvement loans and student loans from third-party lending partnerships. The majority of Synovus' consumer loans are consumer mortgages and The following table summarizes each loan portfolio class by risk grade and origination as of March 31, 2020. Loan Portfolio by Risk Grade and Origination March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans (in thousands) 2020 2019 2018 2017 2016 Prior Amortized Cost Basis Converted to Term Loans Total Commercial, financial and agricultural Pass $ 550,653 $ 1,657,933 $ 1,115,403 $ 769,493 $ 642,584 $ 954,718 $ 4,922,661 $ 78,912 $ 10,692,357 Special Mention 1,884 6,304 18,293 30,775 2,090 13,352 57,251 2,223 132,172 Substandard (1) 2,935 13,677 46,404 6,442 10,500 40,659 63,437 721 184,775 Doubtful (2) — — — 198 915 91 6,919 728 8,851 Total commercial, financial and agricultural 555,472 1,677,914 1,180,100 806,908 656,089 1,008,820 5,050,268 82,584 11,018,155 Owner-occupied Pass 386,363 1,213,917 1,271,307 1,116,905 714,764 1,503,199 284,048 — 6,490,503 Special Mention — 5,742 5,000 12,431 5,058 15,252 — — 43,483 Substandard (1) 338 7,352 38,459 29,820 3,912 29,397 23 — 109,301 Total owner-occupied 386,701 1,227,011 1,314,766 1,159,156 723,734 1,547,848 284,071 — 6,643,287 Total commercial and industrial 942,173 2,904,925 2,494,866 1,966,064 1,379,823 2,556,668 5,334,339 82,584 17,661,442 Investment properties Pass 387,787 1,961,810 2,339,056 1,690,528 855,438 1,765,377 184,095 — 9,184,091 Special Mention 836 92 2,117 4,754 5 10,146 — — 17,950 Substandard (1) 160 1,668 1,718 2,124 1,278 48,802 — — 55,750 Total investment properties 388,783 1,963,570 2,342,891 1,697,406 856,721 1,824,325 184,095 — 9,257,791 1-4 family properties Pass 47,219 203,421 103,044 118,126 54,752 138,793 70,505 — 735,860 Special Mention 5 2,006 — — 815 410 2,273 — 5,509 Substandard (1) 69 2,920 3,726 988 387 1,923 86 — 10,099 Total 1-4 family properties 47,293 208,347 106,770 119,114 55,954 141,126 72,864 — 751,468 Land and development Pass 21,204 205,099 104,987 87,990 26,427 96,809 90,201 — 632,717 Special Mention — 1,544 2,394 639 — 8,608 5,738 — 18,923 Substandard (1) 115 1,327 2,905 635 964 4,356 — — 10,302 Total land and development 21,319 207,970 110,286 89,264 27,391 109,773 95,939 — 661,942 Total commercial real estate 457,395 2,379,887 2,559,947 1,905,784 940,066 2,075,224 352,898 — 10,671,201 Loan Portfolio by Risk Grade and Origination (continued) March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Revolving Loans (in thousands) 2020 2019 2018 2017 2016 Prior Amortized Cost Basis Converted to Term Loans Total Consumer mortgages Pass $ 279,510 $ 1,149,232 $ 701,190 $ 942,965 $ 898,374 $ 1,622,114 $ 880 $ — $ 5,594,265 Substandard (1) — 784 281 1,488 1,811 9,418 — — 13,782 Loss (3) — — — — — 74 — — 74 Total consumer mortgages 279,510 1,150,016 701,471 944,453 900,185 1,631,606 880 — 5,608,121 Home equity lines Pass — — — — — — 1,666,627 93,499 1,760,126 Substandard (1) — — — — — — 11,824 5,949 17,773 Doubtful (2) — — — — — — 17 20 37 Loss (3) — — — — — — 736 190 926 Total home equity lines — — — — — — 1,679,204 99,658 1,778,862 Credit cards Pass — — — — — — 258,904 — 258,904 Substandard (1) — — — — — — 736 — 736 Loss (4) — — — — — — 1,941 — 1,941 Total credit cards — — — — — — 261,581 — 261,581 Other consumer loans Pass 121,380 788,397 438,760 413,899 185,671 100,619 245,304 — 2,294,030 Substandard (1) — 1,117 588 3,849 1,439 1,111 215 — 8,319 Total other consumer loans 121,380 789,514 439,348 417,748 187,110 101,730 245,519 — 2,302,349 Total consumer 400,890 1,939,530 1,140,819 1,362,201 1,087,295 1,733,336 2,187,184 99,658 9,950,913 Total loans (5) $ 1,800,458 $ 7,224,342 $ 6,195,632 $ 5,234,049 $ 3,407,184 $ 6,365,228 $ 7,874,421 $ 182,242 $ 38,283,556 (1) Includes $266.4 million of Substandard accruing loans at March 31, 2020. (2) The loans within this risk grade are on non-accrual status and generally have an ALL equal to 50% of the loan amount. (3) The loans within this risk grade are on non-accrual status and have an ALL 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 ALL equal to the full loan amount and are generally charged off upon reaching 181 days past due in accordance with the FFIEC Retail Credit Classification Policy. (5) Total before net deferred fees and costs of $25.5 million. Loan Portfolio by Risk Grade December 31, 2019 (in thousands) Pass Special Mention Substandard (1) Doubtful (2) Loss (3) Total Commercial, financial and agricultural $ 9,940,359 $ 128,506 $ 182,831 $ 1,163 $ — $ 10,252,859 Owner-occupied 6,386,055 58,330 85,426 — — 6,529,811 Total commercial and industrial 16,326,414 186,836 268,257 1,163 — 16,782,670 Investment properties 8,968,712 16,490 57,477 — — 9,042,679 1-4 family properties 766,529 3,249 10,237 — — 780,015 Land and development 629,351 18,643 9,796 — — 657,790 Total commercial real estate 10,364,592 38,382 77,510 — — 10,480,484 Consumer mortgages 5,527,746 — 18,376 97 149 5,546,368 Home equity lines 1,697,086 — 14,806 21 1,244 1,713,157 Credit cards 266,146 — 818 — 1,877 (4) 268,841 Other consumer loans 2,390,199 — 6,095 — — 2,396,294 Total consumer 9,881,177 — 40,095 118 3,270 9,924,660 Total loans (5) $ 36,572,183 $ 225,218 $ 385,862 $ 1,281 $ 3,270 $ 37,187,814 (1) Includes $288.8 million of substandard accruing loans at December 31, 2019. (2) The loans within this risk grade are on non-accrual status and generally have an ALL equal to 50% of the loan amount. (3) The loans within this risk grade are on non-accrual status and have an ALL 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 ALL equal to the full loan amount and are generally charged off upon reaching 181 days past due in accordance with the FFIEC Retail Credit Classification Policy. (5) Total before net deferred fees and costs of $25.4 million.
Financing Receivable, Allowance for Credit Loss	The following tables detail the changes in the ALL by loan segment for the three months ended March 31, 2020 and 2019. Allowance for Loan Losses Roll Forward As Of and For the Three Months Ended March 31, 2020 (in thousands) Commercial & Industrial Commercial Real Estate Consumer Total Allowance for loan losses: Beginning balance, prior to adoption of ASU 2016-13 $ 145,782 $ 67,430 $ 68,190 $ 281,402 Impact from adoption of ASU 2016-13 (2,310) (651) 85,955 82,994 Charge-offs (14,885) (1,017) (7,972) (23,874) Recoveries 1,741 399 1,673 3,813 Provision for loan losses 86,622 40,956 21,539 149,117 Ending balance $ 216,950 $ 107,117 $ 169,385 $ 493,452 As Of and For the Three Months Ended March 31, 2019 (in thousands) Commercial & Industrial Commercial Real Estate Consumer Total Allowance for loan losses: Beginning balance $ 133,123 $ 68,796 $ 48,636 $ 250,555 Charge-offs (13,039) (1,233) (6,427) (20,699) Recoveries 1,990 344 1,277 3,611 Provision for loan losses 13,565 1,102 8,902 23,569 Ending balance $ 135,639 $ 69,009 $ 52,388 $ 257,036
Troubled Debt Restructurings	Information about Synovus' TDRs is presented in the following tables. The following tables represent, by concession type, the post-modification balance for loans modified or renewed during the three months ended March 31, 2020 and 2019 that were reported as accruing or non-accruing TDRs. TDRs by Concession Type Three Months Ended March 31, 2020 (in thousands, except contract data) Number of Contracts Below Market Interest Rate Other Concessions (1) Total Commercial, financial and agricultural 36 $ 3,724 $ 2,011 $ 5,735 Owner-occupied 5 1,367 96 1,463 Total commercial and industrial 41 5,091 2,107 7,198 Investment properties 2 23,070 — 23,070 1-4 family properties 6 724 442 1,166 Land and development 1 449 — 449 Total commercial real estate 9 24,243 442 24,685 Consumer mortgages 6 515 1,083 1,598 Home equity lines 19 275 964 1,239 Other consumer loans 29 78 1,897 1,975 Total consumer 54 868 3,944 4,812 Total TDRs 104 $ 30,202 $ 6,493 $ 36,695 (2) Three Months Ended March 31, 2019 (in thousands, except contract data) Number of Contracts Below Market Interest Rate Other Concessions(1) Total Commercial, financial and agricultural 13 $ 1,783 $ 899 $ 2,682 Owner-occupied 2 949 — 949 Total commercial and industrial 15 2,732 899 3,631 Investment properties 1 482 — 482 1-4 family properties 6 793 — 793 Total commercial real estate 7 1,275 — 1,275 Consumer mortgages 4 128 1,214 1,342 Home equity lines 1 — 105 105 Other consumer loans 18 108 1,046 1,154 Total consumer 23 236 2,365 2,601 Total TDRs 45 $ 4,243 $ 3,264 $ 7,507 (3) (1) Other concessions generally include term extensions, interest only payments for a period of time, or principal forgiveness, but there was no principal forgiveness for the three months ending March 31, 2020 and 2019. (2) No net charge-offs were recorded during the three months ended March 31, 2020. (3) No net charge-offs were recorded during the three months ended March 31, 2019.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill allocated to each reporting unit at March 31, 2020 and December 31, 2019 is presented as follows (the FMS reportable segment includes two reporting units of Consumer Mortgages and Wealth Management): (in thousands) Community Banking Reporting Unit Wholesale Banking Reporting Unit Consumer Mortgages Reporting Unit Wealth Management Reporting Unit Total Balance as of December 31, 2019 $ 256,323 $ 171,636 $ 44,877 $ 24,431 $ 497,267 Goodwill acquired and adjustments during the year — — — — — Balance as of March 31, 2020 $ 256,323 $ 171,636 $ 44,877 $ 24,431 $ 497,267 Goodwill is evaluated for impairment on an annual basis or whenever an event occurs or circumstances change to indicate that it is more likely than not that an impairment loss has been incurred (i.e. a triggering event). Synovus conducted a goodwill impairment assessment as of December 31, 2019, following Synovus' reorganization, applying ASC 350-20-35-3A Goodwill Subsequent Measurement - Qualitative Assessment Approach and concluded that goodwill was not impaired. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 19 -Segment Reporting" to the consolidated financial statements of Synovus' 2019 Form 10-K for information on Synovus' reorganization during 2019. During the first quarter of 2020, Synovus assessed the indicators of goodwill impairment for each reporting unit and noted certain events related to COVID-19 that indicated it was more likely than not that goodwill was impaired, necessitating an interim test. Triggering events included Synovus' stock price trading below book value for several weeks prior to quarter-end, a series of emergency rate cuts by the Federal Reserve in March, as well as general economic uncertainty surrounding the pandemic. As such, Synovus performed a quantitative assessment of goodwill impairment as of March 31, 2020, which included determining the estimated fair value of each reporting unit and comparing that fair value to the reporting unit's carrying amount. The results of this test indicated that the estimated fair value of each reporting unit exceeded its carrying amount as of March 31, 2020; therefore, goodwill is not impaired as of the testing date. A significant decline in Synovus’ expected future cash flows or estimated growth rates, or a prolonged decline in the price of Synovus’ common stock, due to further deterioration in the economic environment, may necessitate additional interim tests and/or the recording of an impairment charge on goodwill during 2020.
Schedule of Other Intangible Assets	The following table shows the gross carrying amount and accumulated amortization of other intangible assets as of March 31, 2020 and December 31, 2019, which primarily consist of core deposit intangible assets acquired in the FCB acquisition. The CDI is being amortized over its estimated useful life of approximately ten years utilizing an accelerated method. Aggregate other intangible assets amortization expense for the three months ended March 31, 2020 and 2019 was $2.6 million and $3.4 million, respectively. (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Value March 31, 2020 CDI $ 57,400 $ (12,784) $ 44,616 Other 12,500 (4,084) 8,416 Total other intangible assets $ 69,900 $ (16,868) $ 53,032 December 31, 2019 CDI $ 57,400 $ (10,436) $ 46,964 Other 12,500 (3,793) 8,707 Total other intangible assets $ 69,900 $ (14,229) $ 55,671

Shareholders' Equity and Othe_2

Shareholders' Equity and Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Schedule of Dividends Payable	The following table presents dividends declared related to common stock. For information related to preferred stock dividends, see "Part II - Item 8. Financial Statements and Supplementary Data - Note 10 - Shareholders' Equity and Other Comprehensive Income" to the consolidated financial statements of Synovus' 2019 Form 10-K. Three Months Ended March 31, 2020 2019 Cash dividends declared per share $ 0.33 $ 0.30
Share-based Compensation, Stock Options, Activity	Stock Options (in thousands, except per share amounts) Quantity Weighted-Average Exercise Price Per Share Outstanding at January 1, 2020 3,037 $ 22.74 Exercised (220) 29.05 Expired/canceled (6) 20.99 Outstanding at March 31, 2020 2,811 $ 22.25
Schedule of Nonvested Share Activity	RSUs, MRSUs, and PSUs (in thousands, except per share amounts) Quantity Weighted-Average Grant Date Fair Value Per Share Non-vested at January 1, 2020 1,312 $ 39.28 Granted 689 36.63 Quantity change based on TSR and performance factors 23 36.63 Dividend equivalents granted 12 36.63 Vested (556) 39.25 Forfeited (5) 36.63 Non-vested at March 31, 2020 1,475 $ 38.01
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 three months ended March 31, 2020 and 2019. Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes) (in thousands) Net unrealized gains (losses) on investment securities available for sale (1) Net unrealized gains (losses) on cash flow hedges (1) Post-retirement unfunded health benefit Total Balance, December 31, 2019 $ 83,666 $ (18,487) $ 462 $ 65,641 Other comprehensive income (loss) before reclassifications 117,330 80,501 — 197,831 Amounts reclassified from AOCI (6,472) (89) — (6,561) Net current period other comprehensive income (loss) 110,858 80,412 — 191,270 Balance at March 31, 2020 $ 194,524 $ 61,925 $ 462 $ 256,911 Balance, December 31, 2018 $ (83,179) $ (12,137) $ 896 $ (94,420) Other comprehensive income (loss) before reclassifications 76,164 — — 76,164 Amounts reclassified from AOCI (56) — (30) (86) Net current period other comprehensive income (loss) 76,108 — (30) 76,078 Balance at March 31, 2019 $ (7,071) $ (12,137) $ 866 $ (18,342) (1) For all periods presented, the ending balance in net unrealized gains (losses) on cash flow hedges and investment securities available for sale includes unrealized losses of $12.1 million and $13.3 million, respectively, related to residual tax effects remaining in OCI due to previously established deferred tax asset valuation allowances in 2010 and 2011. In accordance with ASC 740-20-45-11(b), under the portfolio approach, these unrealized losses are realized at the time the entire portfolio is sold or disposed.

Fair Value Accounting (Tables)

Fair Value Accounting (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Financial Instruments Measured at Fair Value on Recurring Basis	The following tables present all financial instruments measured at fair value on a recurring basis as of March 31, 2020 and December 31, 2019. March 31, 2020 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: Commercial mortgage-backed securities issued by U.S. Government sponsored enterprises $ — $ 637 $ — $ 637 Other mortgage-backed securities — 1,582 — 1,582 State and municipal securities — 680 — 680 Asset-backed securities — 1,913 — 1,913 Other investments — 45 — 45 Total trading securities $ — $ 4,857 $ — $ 4,857 Investment securities available for sale: U.S. Treasury securities $ 19,918 $ — $ — $ 19,918 U.S. Government agency securities — 74,856 — 74,856 Mortgage-backed securities issued by U.S. Government agencies — 55,422 — 55,422 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 5,549,825 — 5,549,825 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 628,880 — 628,880 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 335,737 — 335,737 State and municipal securities — 1,005 — 1,005 Asset-backed securities — 145,975 — 145,975 Corporate debt securities and other debt securities — 124,060 1,562 125,622 Total investment securities available for sale $ 19,918 $ 6,915,760 $ 1,562 $ 6,937,240 Mortgage loans held for sale — 119,841 — 119,841 Private equity investments 11,877 — 3,255 15,132 Mutual funds and mutual funds held in rabbi trusts 31,241 — — 31,241 GGL/SBA loans servicing asset — — 3,149 3,149 Derivative assets — 466,401 — 466,401 Liabilities Earnout liability $ — $ — $ 11,016 $ 11,016 Derivative liabilities — 184,021 2,050 186,071 December 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Assets and Liabilities at Fair Value Assets Trading securities: Commercial mortgage-backed securities issued by U.S. Government sponsored enterprises $ — $ 2,486 $ — $ 2,486 Other mortgage-backed securities — 1,284 — 1,284 State and municipal securities — 65 — 65 Asset-backed securities — 3,227 — 3,227 Other investments — 150 — 150 Total trading securities $ — $ 7,212 $ — $ 7,212 Investment securities available for sale: U.S. Treasury securities $ 19,855 $ — $ — $ 19,855 U.S. Government agency securities — 36,541 — 36,541 Mortgage-backed securities issued by U.S. Government agencies — 56,816 — 56,816 Mortgage-backed securities issued by U.S. Government sponsored enterprises — 5,180,815 — 5,180,815 Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 636,851 — 636,851 Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises — 371,592 — 371,592 State and municipal securities — 2,075 — 2,075 Asset-backed securities — 327,400 — 327,400 Corporate debt securities and other debt securities — 144,620 2,105 146,725 Total investment securities available for sale $ 19,855 $ 6,756,710 $ 2,105 $ 6,778,670 Mortgage loans held for sale — 115,173 — 115,173 Private equity investments 15,502 — 3,887 19,389 Mutual funds and mutual funds held in rabbi trusts 32,348 — — 32,348 GGL/SBA loans servicing asset — — 3,040 3,040 Derivative assets — 140,016 — 140,016 Liabilities Trading liability for short positions $ 1,560 $ — $ — $ 1,560 Earnout liability — — 11,016 11,016 Derivative liabilities — 34,732 2,339 37,071
Schedule of Mortgage Loans Held for Sale and Changes in Fair Value Included in Consolidated Statements of Income	The following table summarizes the difference between the fair value and the UPB of mortgage loans held for sale and the changes in fair value of these loans. An immaterial portion of these changes in fair value was attributable to changes in instrument-specific credit risk. Mortgage Loans Held for Sale (in thousands) As of March 31, 2020 As of December 31, 2019 Fair value $ 119,841 $ 115,173 Unpaid principal balance 116,268 112,218 Fair value less aggregate unpaid principal balance $ 3,573 $ 2,955 Changes in Fair Value Included in Net Income Three Months Ended March 31, (in thousands) 2020 2019 Mortgage loans held for sale $ 619 $ 356
Changes in Level 3 Fair Value Measurements	Three Months Ended March 31, 2020 (in thousands) Investment Securities Available for Sale Private Equity Investments GGL / SBA Earnout Visa Derivative Beginning balance, December 31, 2019 $ 2,105 $ 3,887 $ 3,040 $ (11,016) $ (2,339) Total gains (losses) realized/unrealized: Included in earnings — (632) (264) — — Unrealized gains (losses) included in OCI (543) — — — — Additions — — 373 — — Settlements — — — — 289 Ending balance, March 31, 2020 $ 1,562 $ 3,255 $ 3,149 $ (11,016) $ (2,050) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets/liabilities still held at March 31, 2020 $ — $ (632) $ — $ — $ — Three Months Ended March 31, 2019 (in thousands) Investment Securities Available for Sale Private Equity Investments GGL / SBA Earnout Visa Derivative Beginning balance, December 31, 2018 $ 1,785 $ 11,028 $ 3,729 $ (14,353) $ (1,673) Total gains (losses) realized/unrealized: Included in earnings — 28 (488) — — Unrealized gains (losses) included in OCI 196 — — — — Additions — — 206 — — Settlements — — — — 307 Transfers out of Level 3 — (1,575) — — — Ending balance, March 31, 2019 $ 1,981 $ 9,481 $ 3,447 $ (14,353) $ (1,366) Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets/liabilities still held at March 31, 2019 $ — $ 28 $ — $ — $ —
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 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. March 31, 2020 (dollars in thousands) Valuation Technique Significant Unobservable Input Level 3 Fair Value Range / Weighted Average Assets measured at fair value on a recurring basis Investment Securities Available for Sale - Discounted cash flow analysis Discount rate $1,562 7.01% 3.56% 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 $3,255 N/A GGL/SBA loans servicing asset Discounted cash flow analysis Discount rate $3,149 12.16% 16.10% Earnout liability Option pricing methods and Monte Carlo simulation Financial projections of Global One $11,016 N/A Visa derivative liability Discounted cash flow analysis Estimated timing of resolution of covered litigation and future cumulative deposits to the litigation escrow for settlement of the Covered Litigation $2,050 0-2 years (4Q 2021) 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. March 31, 2020 Valuation Technique Significant Unobservable Input Range (Weighted Average) (1) Assets measured at fair value on a non-recurring basis Other real estate Third-party appraised value of real estate less estimated selling costs Discount to appraised value 0%-1% (1%) 0%-10% (7%) MPS receivable (2) Third-party appraised value of business less estimated selling costs Discount to appraised value N/A Other assets held for sale Third-party appraised value less estimated selling costs or BOV Discount to appraised value 0%-76% (58%) 0%-10% (7%) (1) The weighted average is the measure of central tendencies; it is not the value that management is using for the asset or liability. (2) See "Part I - Item 1. Notes to Unaudited Interim Financial Statements - Note 10 - Commitments and Contingencies" of this Report for more information on this receivable which was classified as a NPA at March 31, 2020 and December 31, 2019.
Assets Measured at Fair Value on Non-Recurring Basis	March 31, 2020 December 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Other real estate $ — $ — $ 460 $ 460 $ — $ — $ 8,023 $ 8,023 MPS receivable — — 18,490 18,490 — — 21,437 21,437 Other assets held for sale — — 1,206 1,206 — — 1,238 1,238
Fair Value Adjustments Recognized in Earnings for Assets Measured at Fair Value on a Non-recurring Basis	The following table presents fair value adjustments recognized in earnings for the three months ended March 31, 2020 and 2019 for assets measured at fair value on a non-recurring basis still held at period-end. Three Months Ended March 31, (in thousands) 2020 2019 Other real estate $ 5 $ 18 MPS receivable 2,663 — Other assets held for sale 1,391 96
Carrying and Estimated Fair Values of Financial Instruments Carried on Balance Sheet	The following tables present the carrying and estimated fair values of financial instruments at March 31, 2020 and December 31, 2019. The fair values represent management’s best estimates based on a range of methodologies and assumptions. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies" to the consolidated financial statements of Synovus' 2019 Form 10-K for a description of how fair value measurements are determined. March 31, 2020 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets Total cash, cash equivalents, restricted cash, and restricted cash equivalents $ 1,823,834 $ 1,823,834 $ 1,823,834 $ — $ — Trading securities 4,857 4,857 — 4,857 — Investment securities available for sale 6,937,240 6,937,240 19,918 6,915,760 1,562 Mortgage loans held for sale 119,841 119,841 — 119,841 — Private equity investments 15,132 15,132 11,877 — 3,255 Mutual funds and mutual funds held in rabbi trusts 31,241 31,241 31,241 — — Loans, net 37,764,572 38,168,063 — — 38,168,063 GGL/SBA loans servicing asset 3,149 3,149 — — 3,149 Derivative assets 466,401 466,401 — 466,401 — Financial liabilities Non-interest-bearing deposits $ 9,659,451 $ 9,659,451 $ — $ 9,659,451 $ — Non-time interest-bearing deposits 21,305,350 21,305,350 — 21,305,350 — Time deposits 8,861,784 8,934,652 — 8,934,652 — Total deposits $ 39,826,585 $ 39,899,453 $ — $ 39,899,453 $ — Federal funds purchased and securities sold under repurchase agreements 312,776 312,776 312,776 — — Other short-term borrowings 1,175,000 1,175,000 — 1,175,000 — Long-term debt 3,152,339 3,122,480 — 3,122,480 — Earnout liability 11,016 11,016 — — 11,016 Derivative liabilities 186,071 186,071 — 184,021 2,050 December 31, 2019 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets Total cash, cash equivalents, restricted cash, and restricted cash equivalents $ 1,186,918 $ 1,186,918 $ 1,186,918 $ — $ — Trading securities 7,212 7,212 — 7,212 — Investment securities available for sale 6,778,670 6,778,670 19,855 6,756,710 2,105 Mortgage loans held for sale 115,173 115,173 — 115,173 — Private equity investments 19,389 19,389 15,502 — 3,887 Mutual funds and mutual funds held in rabbi trusts 32,348 32,348 32,348 — — Loans, net 36,881,048 36,931,256 — — 36,931,256 GGL/SBA loans servicing asset 3,040 3,040 — — 3,040 Derivative assets 140,016 140,016 — 140,016 — Financial liabilities Non-interest-bearing deposits $ 9,439,485 $ 9,439,485 $ — $ 9,439,485 $ — Non-time interest-bearing deposits 19,891,711 19,891,711 — 19,891,711 — Time deposits 9,074,308 9,112,459 — 9,112,459 — Total deposits $ 38,405,504 $ 38,443,655 $ — $ 38,443,655 $ — Federal funds purchased and securities sold under repurchase agreements 165,690 165,690 165,690 — — Trading liability for short positions 1,560 1,560 1,560 — — Other short-term borrowings 1,752,000 1,752,000 — 1,752,000 — Long-term debt 2,153,897 2,185,717 — 2,185,717 — Earnout liability 11,016 11,016 — — 11,016 Derivative liabilities 37,071 37,071 — 34,732 2,339

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2020
Summary of Derivative Instruments [Abstract]
Impact of Derivatives on Balance Sheet	The following table reflects the notional amount and fair value of derivative instruments included on the consolidated balance sheets. March 31, 2020 December 31, 2019 Fair Value Fair Value (in thousands) Notional Amount Derivative Assets (1) Derivative Liabilities (2) Notional Amount Derivative Assets (1) Derivative Liabilities (2) Derivatives in cash flow hedging relationships: Interest rate contracts $ 2,750,000 $ 90,246 $ — $ 2,000,000 $ 54 $ 8,624 Total derivatives designated as hedging instruments $ 90,246 $ — $ 54 $ 8,624 Derivatives not designated Interest rate contracts (3) $ 8,260,884 $ 367,841 $ 178,496 $ 7,258,159 $ 138,672 $ 25,849 Mortgage derivatives - interest rate lock commitments 412,218 8,314 — 70,481 1,290 — Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans 330,000 — 5,097 107,000 — 168 Other contracts (4) 159,412 — 428 145,764 — 91 Visa derivative — — 2,050 — — 2,339 Total derivatives not designated as hedging instruments $ 376,155 $ 186,071 $ 139,962 $ 28,447 (1) Derivative assets are recorded in other assets on the consolidated balance sheets. (2) Derivative liabilities are recorded in other liabilities on the consolidated balance sheets. (3) Includes interest rate contracts for customer swaps and offsetting positions, net of variation margin payments. (4) Includes risk participation agreements sold. Additionally, the notional amount of risk participation agreements purchased was $2.9 million and $3.0 million at March 31, 2020 and December 31, 2019, respectively.
Schedule of Derivative Instruments, Effect on Hedging	The following table presents the effect of hedging derivative instruments on the consolidated statements of income and the total amounts for the respective line item affected for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, (in thousands) 2020 2019 Total amounts presented in the consolidated statements of income in interest income on loans $ 3,637 $ — Gain/loss on cash flow hedging relationships: (1) Interest rate swaps: Realized gains (losses) reclassified from AOCI, pre-tax, to interest income on loans 120 — Pre-tax income recognized on cash flow hedges $ 120 $ — (1) See "Part I - Item 1. Financial Statements and Supplementary Data - Note 6 - Shareholders' Equity and Other Comprehensive Income (Loss) in this Report for additional information.
Effect of Fair Value Hedges on Consolidated Statements of Income	The pre-tax effect of changes in fair value from derivative instruments not designated as hedging instruments on the consolidated statements of income for the three months ended March 31, 2020 and 2019 is presented below. Gain (Loss) Recognized in Consolidated Statements of Income Three Months Ended March 31, (in thousands) Location in Consolidated Statements of Income 2020 2019 Derivatives not designated as hedging instruments: Interest rate contracts (1) Capital markets income $ (604) $ (130) Other contracts (2) Capital markets income (337) — Mortgage derivatives - interest rate lock commitments Mortgage banking income 7,024 693 Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans Mortgage banking income (4,929) 13 Total derivatives not designated as hedging instruments $ 1,154 $ 576 (1) Additionally, losses related to termination of customer swaps of $2.5 million were recorded in other non-interest expense for the three months ended March 31, 2020.

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share	The following table displays a reconciliation of the information used in calculating basic and diluted earnings per common share for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, (in thousands, except per share data) 2020 2019 Basic Net Income Per Common Share: Net income available to common shareholders $ 30,230 $ 117,036 Weighted average common shares outstanding 147,311 160,927 Net income per common share, basic $ 0.21 $ 0.73 Diluted Net Income Per Common Share: Net income available to common shareholders $ 30,230 $ 117,036 Weighted average common shares outstanding 147,311 160,927 Effect of dilutive outstanding equity-based awards, warrants, and earnout payments 1,090 1,833 Weighted average diluted common shares 148,401 162,760 Net income per common share, diluted $ 0.20 $ 0.72

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loan Commitments and Letters of Credit	(in thousands) March 31, 2020 December 31, 2019 Letters of credit* $ 182,629 $ 202,614 Commitments to fund commercial and industrial loans 6,994,969 7,018,152 Commitments to fund commercial real estate, construction, and land development loans 2,925,791 3,032,252 Commitments under home equity lines of credit 1,508,176 1,501,452 Unused credit card lines 940,016 877,929 Other loan commitments 469,958 485,371 Total letters of credit and unfunded lending commitments $ 13,021,539 $ 13,117,770 Investments in low income housing, solar energy tax credit, and other CRA partnerships: Carrying amount included in other assets $ 166,460 $ 146,612 Amount of future funding commitments included in carrying amount 93,749 78,266 Short-term construction loans and letter of credit commitments 792 2,124 Funded portion of short-term loans and letters of credit 4,516 3,196

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Schedule of Segment Reporting	The following table presents certain financial information for each reportable business segment for the first quarter of 2020. To provide comparable information, Synovus has included proforma business segment financial information for the first quarter of 2019 utilizing various allocation methodologies based on balance sheet and income statement items assigned to each business segment. The application and development of management reporting methodologies is a dynamic process and is subject to periodic enhancements. As these enhancements are made, financial results presented by each reportable business segment may be periodically revised. (in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated First Quarter 2020 Net interest income $ 197,246 $ 123,170 $ 16,782 $ 36,062 $ 373,260 Non-interest revenue 33,449 9,256 47,275 13,877 103,857 Non-interest expense 75,304 18,202 43,289 139,484 276,279 Pre-provision net revenue $ 155,391 $ 114,224 $ 20,768 $ (89,545) $ 200,838 (in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated First Quarter 2019 Proforma Net interest income $ 214,759 $ 125,611 $ 28,865 $ 27,940 $ 397,175 Non-interest revenue 32,776 6,758 32,279 7,565 79,378 Non-interest expense 74,816 15,019 33,218 169,357 292,410 Pre-provision net revenue $ 172,719 $ 117,350 $ 27,926 $ (133,852) $ 184,143 March 31, 2020 (dollars in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated Total loans net of deferred fees and costs $ 12,224,112 $ 18,691,302 $ 5,344,276 $ 1,998,334 $ 38,258,024 Total deposits 25,364,034 9,111,207 266,839 5,084,505 39,826,585 Total full-time equivalent employees 2,291 237 838 1,936 5,302 December 31, 2019 (dollars in thousands) Community Banking Wholesale Banking Financial Management Services Treasury and Corporate Other Synovus Consolidated Total loans net of deferred fees and costs $ 12,170,914 $ 17,643,509 $ 5,285,455 $ 2,062,572 $ 37,162,450 Total deposits 25,610,777 8,314,184 284,716 4,195,827 38,405,504 Total full-time equivalent employees 2,301 213 839 1,911 5,264

Basis of Presentation and Acc_4

Basis of Presentation and Accounting Policies (Narrative) (Details) $ in Thousands		Jan. 01, 2020USD ($)	Mar. 31, 2020branchATM	Dec. 31, 2019USD ($)
Accounting Policies [Abstract]
Number of branches | branch			299
Number of ATMs | ATM			386
Basis Of Presentation [Line Items]
Period of forecast reverts for loans			1 year
ASU 2016-13
Basis Of Presentation [Line Items]
Adjustment from adoption of ASU	[1]			$ (35,721)
ASU 2016-13 | Unfunded Loan Commitment
Basis Of Presentation [Line Items]
Adjustment from adoption of ASU		$ 35,700
Cost basis of loans		$ 62,200
[1]	For additional information, see "Part I - Item 1. Financial Statements and Supplementary Data - Note 1 - Basis of Presentation" in this Report.

Basis of Presentation and Acc_5

Basis of Presentation and Accounting Policies (Schedule of Adoption) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses	$ 493,452		$ 281,402	$ 257,036	$ 250,555
Retained earnings	1,014,238		1,068,327
Total commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses	216,950		145,782	135,639	133,123
Total commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses	107,117		67,430	69,009	68,796
Retail
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses	$ 169,385		$ 68,190	$ 52,388	$ 48,636
ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		$ 281,402
Reserve for unfunded commitments		1,375
Allowance for credit losses		282,777
Loans, net		36,881,048
Retained earnings		1,068,327
ASU 2016-13 | Total commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		145,782
ASU 2016-13 | Total commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		67,430
ASU 2016-13 | Retail
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		68,190
ASU 2016-13 | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		82,994
Reserve for unfunded commitments		27,440
Allowance for credit losses		110,434
Loans, net		(20,767)
Retained earnings		(35,721)
ASU 2016-13 | Impact of ASC 326 Adoption | Total commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		(2,310)
ASU 2016-13 | Impact of ASC 326 Adoption | Total commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		(651)
ASU 2016-13 | Impact of ASC 326 Adoption | Retail
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		85,955
ASU 2016-13 | As Reported under ASC 326
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		364,396
Reserve for unfunded commitments		28,815
Allowance for credit losses		393,211
Loans, net		36,860,281
Retained earnings		1,032,606
ASU 2016-13 | As Reported under ASC 326 | Total commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		143,472
ASU 2016-13 | As Reported under ASC 326 | Total commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		66,779
ASU 2016-13 | As Reported under ASC 326 | Retail
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total allowance for loan losses		$ 154,145

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Oct. 01, 2016	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Merger-related expense			$ 0	$ 49,738
FCB Financial Holdings, Inc.
Business Acquisition [Line Items]
Consideration transferred	$ 1,630,000
Loans	9,290,000		90,300
Deposits	$ 10,930,000
Merger-related expense				$ 49,738
Global One
Business Acquisition [Line Items]
Earnout liability			$ 11,000
Global One | Minimum
Business Acquisition [Line Items]
Period of additional annual payments		3 years
Global One | Maximum
Business Acquisition [Line Items]
Period of additional annual payments		5 years

Acquisitions (Acquisition Relat

Acquisitions (Acquisition Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Total merger-related expense	$ 0	$ 49,738
FCB Financial Holdings, Inc.
Business Acquisition [Line Items]
Total merger-related expense		49,738
FCB Financial Holdings, Inc. | Employment compensation agreements, severance, and other employee benefit costs
Business Acquisition [Line Items]
Total merger-related expense		32,988
FCB Financial Holdings, Inc. | Professional fees
Business Acquisition [Line Items]
Total merger-related expense		15,200
FCB Financial Holdings, Inc. | All other expense
Business Acquisition [Line Items]
Total merger-related expense		$ 1,550

Investment Securities Availab_3

Investment Securities Available for Sale (Summary of Available for Sale Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 6,656,754	$ 6,647,791
Gross Unrealized Gains	294,334	133,385
Gross Unrealized Losses	(13,848)	(2,506)
Fair Value	6,937,240	6,778,670
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,918	19,855
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	19,918	19,855
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	72,424	35,499
Gross Unrealized Gains	2,469	1,042
Gross Unrealized Losses	(37)	0
Fair Value	74,856	36,541
Mortgage-backed securities issued by U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	53,557	56,328
Gross Unrealized Gains	1,866	560
Gross Unrealized Losses	(1)	(72)
Fair Value	55,422	56,816
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,312,698	5,079,396
Gross Unrealized Gains	237,127	103,495
Gross Unrealized Losses	0	(2,076)
Fair Value	5,549,825	5,180,815
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	601,585	629,706
Gross Unrealized Gains	27,297	7,349
Gross Unrealized Losses	(2)	(204)
Fair Value	628,880	636,851
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	311,235	357,291
Gross Unrealized Gains	24,502	14,301
Gross Unrealized Losses	0	0
Fair Value	335,737	371,592
State and municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,007	2,069
Gross Unrealized Gains	2	6
Gross Unrealized Losses	(4)	0
Fair Value	1,005	2,075
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	154,954	323,237
Gross Unrealized Gains	150	4,315
Gross Unrealized Losses	(9,129)	(152)
Fair Value	145,975	327,400
Corporate debt securities and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	129,376	144,410
Gross Unrealized Gains	921	2,317
Gross Unrealized Losses	(4,675)	(2)
Fair Value	$ 125,622	$ 146,725

Investment Securities Availab_4

Investment Securities Available for Sale (Narrative) (Details) $ in Millions	Mar. 31, 2020USD ($)securities	Dec. 31, 2019USD ($)securities
Financing Receivable, Impaired [Line Items]
Investment securities in a loss position for less than twelve months	17	26
Investment securities in a loss position for twelve months or longer	3	5
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Pledged to secure deposits | $	$ 2,160	$ 1,710

Investment Securities Availab_5

Investment Securities Available for Sale (Schedule of Gross Unrealized Losses on Investment Securities and Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	$ 285,770	$ 891,914
Less than 12 Months, Gross Unrealized Losses	(13,847)	(2,468)
12 Months or Longer, Fair Value	32	5,309
12 Months or Longer, Gross Unrealized Losses	(1)	(38)
Total, Fair Value	285,802	897,223
Total, Gross Unrealized Losses	(13,848)	(2,506)
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	38,502
Less than 12 Months, Gross Unrealized Losses	(37)
12 Months or Longer, Fair Value	0
12 Months or Longer, Gross Unrealized Losses	0
Total, Fair Value	38,502
Total, Gross Unrealized Losses	(37)
Mortgage-backed securities issued by U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	6	19,543
Less than 12 Months, Gross Unrealized Losses	(1)	(70)
12 Months or Longer, Fair Value	0	355
12 Months or Longer, Gross Unrealized Losses	0	(2)
Total, Fair Value	6	19,898
Total, Gross Unrealized Losses	(1)	(72)
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value		768,040
Less than 12 Months, Gross Unrealized Losses		(2,076)
12 Months or Longer, Fair Value		0
12 Months or Longer, Gross Unrealized Losses		0
Total, Fair Value		768,040
Total, Gross Unrealized Losses		(2,076)
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	320	57,670
Less than 12 Months, Gross Unrealized Losses	(1)	(204)
12 Months or Longer, Fair Value	32	0
12 Months or Longer, Gross Unrealized Losses	(1)	0
Total, Fair Value	352	57,670
Total, Gross Unrealized Losses	(2)	(204)
State and municipal securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	503
Less than 12 Months, Gross Unrealized Losses	(4)
12 Months or Longer, Fair Value	0
12 Months or Longer, Gross Unrealized Losses	0
Total, Fair Value	503
Total, Gross Unrealized Losses	(4)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	140,993	37,156
Less than 12 Months, Gross Unrealized Losses	(9,129)	(116)
12 Months or Longer, Fair Value	0	4,954
12 Months or Longer, Gross Unrealized Losses	0	(36)
Total, Fair Value	140,993	42,110
Total, Gross Unrealized Losses	(9,129)	(152)
Corporate debt securities and other debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	105,446	9,505
Less than 12 Months, Gross Unrealized Losses	(4,675)	(2)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Gross Unrealized Losses	0	0
Total, Fair Value	105,446	9,505
Total, Gross Unrealized Losses	$ (4,675)	$ (2)

Investment Securities Availab_6

Investment Securities Available for Sale (Amortized Cost and Estimated Fair Value by Contractual Maturity of Investment Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Within One year, Amortized Cost	$ 44,613
1 to 5 Years, Amortized Cost	209,819
5 to 10 Years, Amortized Cost	410,917
More Than 10 years, Amortized Cost	5,991,405
Amortized Cost	6,656,754	$ 6,647,791
Fair Value
Within One Year, Fair Value	44,564
1 to 5 Years, Fair Value	214,381
5 to 10 Years, Fair Value	421,664
More Than 10 years, Fair Value	6,256,631
Total, Fair Value	6,937,240	6,778,670
U.S. Treasury securities
Amortized Cost
Within One year, Amortized Cost	19,918
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	0
Amortized Cost	19,918	19,855
Fair Value
Within One Year, Fair Value	19,918
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	0
Total, Fair Value	19,918	19,855
U.S. Government agency securities
Amortized Cost
Within One year, Amortized Cost	568
1 to 5 Years, Amortized Cost	3,367
5 to 10 Years, Amortized Cost	43,501
More Than 10 years, Amortized Cost	24,988
Amortized Cost	72,424	35,499
Fair Value
Within One Year, Fair Value	578
1 to 5 Years, Fair Value	3,426
5 to 10 Years, Fair Value	45,897
More Than 10 years, Fair Value	24,955
Total, Fair Value	74,856	36,541
Mortgage-backed securities issued by U.S. Government agencies
Amortized Cost
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	1,542
5 to 10 Years, Amortized Cost	803
More Than 10 years, Amortized Cost	51,212
Amortized Cost	53,557	56,328
Fair Value
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	1,588
5 to 10 Years, Fair Value	831
More Than 10 years, Fair Value	53,003
Total, Fair Value	55,422	56,816
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Amortized Cost
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	517
5 to 10 Years, Amortized Cost	86,523
More Than 10 years, Amortized Cost	5,225,658
Amortized Cost	5,312,698	5,079,396
Fair Value
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	536
5 to 10 Years, Fair Value	92,059
More Than 10 years, Fair Value	5,457,230
Total, Fair Value	5,549,825	5,180,815
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Amortized Cost
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	296
More Than 10 years, Amortized Cost	601,289
Amortized Cost	601,585
Fair Value
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	309
More Than 10 years, Fair Value	628,571
Total, Fair Value	628,880
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Amortized Cost
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	109,774
5 to 10 Years, Amortized Cost	116,210
More Than 10 years, Amortized Cost	85,251
Amortized Cost	311,235	357,291
Fair Value
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	116,257
5 to 10 Years, Fair Value	129,175
More Than 10 years, Fair Value	90,305
Total, Fair Value	335,737	371,592
State and municipal securities
Amortized Cost
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	0
More Than 10 years, Amortized Cost	1,007
Amortized Cost	1,007	2,069
Fair Value
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	0
More Than 10 years, Fair Value	1,005
Total, Fair Value	1,005	2,075
Asset-backed securities
Amortized Cost
Within One year, Amortized Cost	0
1 to 5 Years, Amortized Cost	0
5 to 10 Years, Amortized Cost	154,954
More Than 10 years, Amortized Cost	0
Amortized Cost	154,954	323,237
Fair Value
Within One Year, Fair Value	0
1 to 5 Years, Fair Value	0
5 to 10 Years, Fair Value	145,975
More Than 10 years, Fair Value	0
Total, Fair Value	145,975	327,400
Corporate debt securities and other debt securities
Amortized Cost
Within One year, Amortized Cost	24,127
1 to 5 Years, Amortized Cost	94,619
5 to 10 Years, Amortized Cost	8,630
More Than 10 years, Amortized Cost	2,000
Amortized Cost	129,376	144,410
Fair Value
Within One Year, Fair Value	24,068
1 to 5 Years, Fair Value	92,574
5 to 10 Years, Fair Value	7,418
More Than 10 years, Fair Value	1,562
Total, Fair Value	$ 125,622	$ 146,725

Investment Securities Availab_7

Investment Securities Available for Sale (Summary of Sales Transactions in the Investment Securities Available for Sale Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Investments [Abstract]
Proceeds from sales of investment securities available for sale	$ 413,180	$ 1,642,239
Gross realized gains on sales	8,734	9,130
Gross realized losses on sales	0	(9,055)
Investment securities gains, net	$ 8,734	$ 75

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses (Schedule of Current, Accruing Past Due and Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	$ 38,258,024	$ 37,162,450
Non-accrual	124,805	99,848
Non-accrual, without an allowance	31,482
Total loans	38,283,556	37,187,814
Deferred fees and costs, net	25,500	25,400
FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		5,557,334
Loans	90,300		$ 9,290,000
Acquired Loans, ASC 310-30 [Member] | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	1,800
Total commercial and industrial
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	85,981	65,797
Non-accrual, without an allowance	30,663
Total loans	17,661,442	16,782,670
Total commercial and industrial | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		1,842,331
Total commercial and industrial | Commercial, financial and agricultural
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	78,263	56,017
Non-accrual, without an allowance	21,024
Total loans	11,018,155	10,252,859
Total commercial and industrial | Commercial, financial and agricultural | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		1,019,135
Total commercial and industrial | Owner-occupied
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	7,718	9,780
Non-accrual, without an allowance	9,639
Total loans	6,643,287	6,529,811
Total commercial and industrial | Owner-occupied | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		823,196
Total commercial real estate
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	6,472	4,944
Non-accrual, without an allowance	265
Total loans	10,671,201	10,480,484
Total commercial real estate | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		1,856,170
Total commercial real estate | Investment properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	2,212	1,581
Non-accrual, without an allowance	0
Total loans	9,257,791	9,042,679
Total commercial real estate | Investment properties | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		1,736,608
Total commercial real estate | 1-4 family properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	2,325	2,253
Non-accrual, without an allowance	0
Total loans	751,468	780,015
Total commercial real estate | 1-4 family properties | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		41,401
Total commercial real estate | Land and development
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	1,935	1,110
Non-accrual, without an allowance	265
Total loans	661,942	657,790
Total commercial real estate | Land and development | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		78,161
Total consumer
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	32,352	29,107
Non-accrual, without an allowance	554
Total loans	9,950,913	9,924,660
Total consumer | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		1,858,833
Total consumer | Consumer mortgages
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	13,017	11,369
Non-accrual, without an allowance	554
Total loans	5,608,121	5,546,368
Total consumer | Consumer mortgages | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		1,848,493
Total consumer | Home equity lines
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	12,475	12,034
Non-accrual, without an allowance	0
Total loans	1,778,862	1,713,157
Total consumer | Home equity lines | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		2,155
Total consumer | Credit cards
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	0	0
Non-accrual, without an allowance	0
Total loans	261,581	268,841
Total consumer | Credit cards | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		0
Total consumer | Other consumer loans
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-accrual	6,860	5,704
Non-accrual, without an allowance	0
Total loans	2,302,349	2,396,294
Total consumer | Other consumer loans | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
ASC 310-30 Loans		8,185
Current
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	38,044,034	31,442,999
Current | Total commercial and industrial
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	17,511,689	14,828,680
Current | Total commercial and industrial | Commercial, financial and agricultural
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	10,896,890	9,137,585
Current | Total commercial and industrial | Owner-occupied
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	6,614,799	5,691,095
Current | Total commercial real estate
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	10,655,513	8,614,841
Current | Total commercial real estate | Investment properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	9,252,438	7,303,146
Current | Total commercial real estate | 1-4 family properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	744,451	733,984
Current | Total commercial real estate | Land and development
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	658,624	577,711
Current | Total consumer
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	9,876,832	7,999,478
Current | Total consumer | Consumer mortgages
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	5,583,714	3,681,553
Current | Total consumer | Home equity lines
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	1,759,571	1,691,759
Current | Total consumer | Credit cards
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	256,445	263,065
Current | Total consumer | Other consumer loans
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	2,277,102	2,363,101
Accruing 30 to 89 Days Pat Due
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	76,837	81,330
Accruing 30 to 89 Days Pat Due | Acquired Loans, ASC 310-30 [Member] | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans	26,500
Accruing 30 to 89 Days Pat Due | Total commercial and industrial
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	31,428	44,080
Accruing 30 to 89 Days Pat Due | Total commercial and industrial | Commercial, financial and agricultural
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	21,149	38,916
Accruing 30 to 89 Days Pat Due | Total commercial and industrial | Owner-occupied
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	10,279	5,164
Accruing 30 to 89 Days Pat Due | Total commercial real estate
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	8,668	4,225
Accruing 30 to 89 Days Pat Due | Total commercial real estate | Investment properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	3,056	1,344
Accruing 30 to 89 Days Pat Due | Total commercial real estate | 1-4 family properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	4,636	2,073
Accruing 30 to 89 Days Pat Due | Total commercial real estate | Land and development
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	976	808
Accruing 30 to 89 Days Pat Due | Total consumer
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	36,741	33,025
Accruing 30 to 89 Days Pat Due | Total consumer | Consumer mortgages
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	10,836	4,223
Accruing 30 to 89 Days Pat Due | Total consumer | Home equity lines
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	5,873	7,038
Accruing 30 to 89 Days Pat Due | Total consumer | Credit cards
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	2,465	3,076
Accruing 30 to 89 Days Pat Due | Total consumer | Other consumer loans
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	17,567	18,688
Accruing 90 to 149 Days Pat Due
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	6,398	6,303
Accruing 90 to 149 Days Pat Due | Acquired Loans, ASC 310-30 [Member] | FCB Financial Holdings, Inc.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans	9,600
Accruing 90 to 149 Days Pat Due | Total commercial and industrial
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	1,681	1,782
Accruing 90 to 149 Days Pat Due | Total commercial and industrial | Commercial, financial and agricultural
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	829	1,206
Accruing 90 to 149 Days Pat Due | Total commercial and industrial | Owner-occupied
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	852	576
Accruing 90 to 149 Days Pat Due | Total commercial real estate
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	283	304
Accruing 90 to 149 Days Pat Due | Total commercial real estate | Investment properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	85	0
Accruing 90 to 149 Days Pat Due | Total commercial real estate | 1-4 family properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	56	304
Accruing 90 to 149 Days Pat Due | Total commercial real estate | Land and development
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	142	0
Accruing 90 to 149 Days Pat Due | Total consumer
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	4,434	4,217
Accruing 90 to 149 Days Pat Due | Total consumer | Consumer mortgages
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	0	730
Accruing 90 to 149 Days Pat Due | Total consumer | Home equity lines
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	943	171
Accruing 90 to 149 Days Pat Due | Total consumer | Credit cards
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	2,671	2,700
Accruing 90 to 149 Days Pat Due | Total consumer | Other consumer loans
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	820	616
Total Accruing Past Due
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	83,235	87,633
Total Accruing Past Due | Total commercial and industrial
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	33,109	45,862
Total Accruing Past Due | Total commercial and industrial | Commercial, financial and agricultural
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	21,978	40,122
Total Accruing Past Due | Total commercial and industrial | Owner-occupied
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	11,131	5,740
Total Accruing Past Due | Total commercial real estate
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	8,951	4,529
Total Accruing Past Due | Total commercial real estate | Investment properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	3,141	1,344
Total Accruing Past Due | Total commercial real estate | 1-4 family properties
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	4,692	2,377
Total Accruing Past Due | Total commercial real estate | Land and development
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	1,118	808
Total Accruing Past Due | Total consumer
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	41,175	37,242
Total Accruing Past Due | Total consumer | Consumer mortgages
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	10,836	4,953
Total Accruing Past Due | Total consumer | Home equity lines
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	6,816	7,209
Total Accruing Past Due | Total consumer | Credit cards
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	5,136	5,776
Total Accruing Past Due | Total consumer | Other consumer loans
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Loans, net of deferred fees and costs	$ 18,387	$ 19,304

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020USD ($)contract	Mar. 31, 2019USD ($)contract	Dec. 31, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized, cash basis	$ 961,000	$ 648,000
Loans pledged as collateral	$ 15,240,000,000		$ 12,110,000,000
ACL to loans ratio	1.39%
CECL estimates qualitative overlay	$ 37,300,000
Basis points added to allowance for credit losses	0.10%
Recorded Investment	$ 36,695,000	$ 7,507,000
Commitments to land additional funds to TDRs	$ 0		$ 0
Troubled Debt Restructuring That Subsequently Defaults
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	3	0
Recorded Investment	$ 618,000
Interest Income Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized	$ 2,100,000	$ 2,100,000
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 loan charge off (in days)		120 days

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 38,283,556	$ 37,187,814
Accrual substandard loans	266,400	288,800
Deferred fees and costs, net	$ 25,500	25,400
Maximum
Financing Receivable, Credit Quality Indicator [Line Items]
Allowance for loan losses, percent of loan amount	50.00%
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		36,572,183
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		225,218
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		385,862
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,281
Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		3,270
Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 17,661,442	16,782,670
Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11,018,155	10,252,859
Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,643,287	6,529,811
Total commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		16,326,414
Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,692,357	9,940,359
Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,490,503	6,386,055
Total commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		186,836
Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	132,172	128,506
Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	43,483	58,330
Total commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		268,257
Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	184,775	182,831
Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	109,301	85,426
Total commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,163
Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,851	1,163
Total commercial and industrial | Doubtful | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial and industrial | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial and industrial | Loss | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial and industrial | Loss | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,671,201	10,480,484
Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,257,791	9,042,679
Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	751,468	780,015
Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	661,942	657,790
Total commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		10,364,592
Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,184,091	8,968,712
Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	735,860	766,529
Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	632,717	629,351
Total commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		38,382
Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,950	16,490
Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,509	3,249
Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	18,923	18,643
Total commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		77,510
Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	55,750	57,477
Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,099	10,237
Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,302	9,796
Total commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Doubtful | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Doubtful | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Doubtful | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total commercial real estate | Loss | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,950,913	9,924,660
Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,608,121	5,546,368
Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,778,862	1,713,157
Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	261,581	268,841
Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,302,349	2,396,294
Total consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		9,881,177
Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,594,265	5,527,746
Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,760,126	1,697,086
Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	258,904	266,146
Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,294,030	2,390,199
Total consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Special Mention | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		40,095
Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,782	18,376
Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,773	14,806
Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	736	818
Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,319	6,095
Total consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		118
Total consumer | Doubtful | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		97
Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	37	21
Total consumer | Doubtful | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Doubtful | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Total consumer | Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		3,270
Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	74	149
Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	926	1,244
Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,941	1,877
Total consumer | Loss | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		$ 0
Revolving Loans Amortized Cost Basis
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,874,421
Revolving Loans Amortized Cost Basis | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,334,339
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,050,268
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	284,071
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,922,661
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	284,048
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	57,251
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	63,437
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	23
Revolving Loans Amortized Cost Basis | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,919
Revolving Loans Amortized Cost Basis | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	352,898
Revolving Loans Amortized Cost Basis | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	184,095
Revolving Loans Amortized Cost Basis | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	72,864
Revolving Loans Amortized Cost Basis | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	95,939
Revolving Loans Amortized Cost Basis | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	184,095
Revolving Loans Amortized Cost Basis | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	70,505
Revolving Loans Amortized Cost Basis | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	90,201
Revolving Loans Amortized Cost Basis | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,273
Revolving Loans Amortized Cost Basis | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,738
Revolving Loans Amortized Cost Basis | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	86
Revolving Loans Amortized Cost Basis | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,187,184
Revolving Loans Amortized Cost Basis | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	880
Revolving Loans Amortized Cost Basis | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,679,204
Revolving Loans Amortized Cost Basis | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	261,581
Revolving Loans Amortized Cost Basis | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	245,519
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	880
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,666,627
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	258,904
Revolving Loans Amortized Cost Basis | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	245,304
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11,824
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	736
Revolving Loans Amortized Cost Basis | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	215
Revolving Loans Amortized Cost Basis | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17
Revolving Loans Amortized Cost Basis | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Amortized Cost Basis | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	736
Revolving Loans Amortized Cost Basis | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,941
Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	182,242
Revolving Loans Converted to Term Loans | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	82,584
Revolving Loans Converted to Term Loans | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	82,584
Revolving Loans Converted to Term Loans | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	78,912
Revolving Loans Converted to Term Loans | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,223
Revolving Loans Converted to Term Loans | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	721
Revolving Loans Converted to Term Loans | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	728
Revolving Loans Converted to Term Loans | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	99,658
Revolving Loans Converted to Term Loans | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	99,658
Revolving Loans Converted to Term Loans | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	93,499
Revolving Loans Converted to Term Loans | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,949
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	20
Revolving Loans Converted to Term Loans | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Revolving Loans Converted to Term Loans | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	190
Revolving Loans Converted to Term Loans | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,800,458
2020 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	942,173
2020 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	555,472
2020 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	386,701
2020 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	550,653
2020 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	386,363
2020 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,884
2020 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,935
2020 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	338
2020 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	457,395
2020 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	388,783
2020 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	47,293
2020 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	21,319
2020 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	387,787
2020 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	47,219
2020 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	21,204
2020 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	836
2020 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5
2020 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	160
2020 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	69
2020 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	115
2020 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	400,890
2020 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	279,510
2020 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	121,380
2020 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	279,510
2020 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	121,380
2020 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2020 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,224,342
2019 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,904,925
2019 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,677,914
2019 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,227,011
2019 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,657,933
2019 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,213,917
2019 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,304
2019 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,742
2019 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,677
2019 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,352
2019 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,379,887
2019 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,963,570
2019 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	208,347
2019 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	207,970
2019 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,961,810
2019 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	203,421
2019 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	205,099
2019 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	92
2019 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,006
2019 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,544
2019 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,668
2019 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,920
2019 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,327
2019 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,939,530
2019 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,150,016
2019 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	789,514
2019 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,149,232
2019 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	788,397
2019 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	784
2019 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,117
2019 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2019 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,195,632
2018 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,494,866
2018 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,180,100
2018 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,314,766
2018 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,115,403
2018 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,271,307
2018 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	18,293
2018 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,000
2018 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	46,404
2018 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	38,459
2018 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,559,947
2018 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,342,891
2018 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	106,770
2018 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	110,286
2018 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,339,056
2018 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	103,044
2018 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	104,987
2018 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,117
2018 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,394
2018 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,718
2018 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,726
2018 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,905
2018 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,140,819
2018 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	701,471
2018 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	439,348
2018 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	701,190
2018 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	438,760
2018 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	281
2018 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	588
2018 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2018 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,234,049
2017 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,966,064
2017 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	806,908
2017 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,159,156
2017 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	769,493
2017 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,116,905
2017 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	30,775
2017 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,431
2017 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,442
2017 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	29,820
2017 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	198
2017 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,905,784
2017 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,697,406
2017 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	119,114
2017 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	89,264
2017 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,690,528
2017 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	118,126
2017 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	87,990
2017 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,754
2017 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	639
2017 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,124
2017 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	988
2017 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	635
2017 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,362,201
2017 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	944,453
2017 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	417,748
2017 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	942,965
2017 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	413,899
2017 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,488
2017 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,849
2017 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2017 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,407,184
2016 | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,379,823
2016 | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	656,089
2016 | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	723,734
2016 | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	642,584
2016 | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	714,764
2016 | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,090
2016 | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,058
2016 | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,500
2016 | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,912
2016 | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	915
2016 | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	940,066
2016 | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	856,721
2016 | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	55,954
2016 | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	27,391
2016 | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	855,438
2016 | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	54,752
2016 | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	26,427
2016 | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5
2016 | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	815
2016 | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,278
2016 | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	387
2016 | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	964
2016 | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,087,295
2016 | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	900,185
2016 | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	187,110
2016 | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	898,374
2016 | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	185,671
2016 | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,811
2016 | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,439
2016 | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
2016 | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,365,228
Prior | Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,556,668
Prior | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,008,820
Prior | Total commercial and industrial | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,547,848
Prior | Total commercial and industrial | Pass | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	954,718
Prior | Total commercial and industrial | Pass | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,503,199
Prior | Total commercial and industrial | Special Mention | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,352
Prior | Total commercial and industrial | Special Mention | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	15,252
Prior | Total commercial and industrial | Substandard | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	40,659
Prior | Total commercial and industrial | Substandard | Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	29,397
Prior | Total commercial and industrial | Doubtful | Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	91
Prior | Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,075,224
Prior | Total commercial real estate | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,824,325
Prior | Total commercial real estate | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	141,126
Prior | Total commercial real estate | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	109,773
Prior | Total commercial real estate | Pass | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,765,377
Prior | Total commercial real estate | Pass | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	138,793
Prior | Total commercial real estate | Pass | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	96,809
Prior | Total commercial real estate | Special Mention | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,146
Prior | Total commercial real estate | Special Mention | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	410
Prior | Total commercial real estate | Special Mention | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,608
Prior | Total commercial real estate | Substandard | Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	48,802
Prior | Total commercial real estate | Substandard | 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,923
Prior | Total commercial real estate | Substandard | Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,356
Prior | Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,733,336
Prior | Total consumer | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,631,606
Prior | Total consumer | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	101,730
Prior | Total consumer | Pass | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,622,114
Prior | Total consumer | Pass | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Pass | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Pass | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	100,619
Prior | Total consumer | Substandard | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,418
Prior | Total consumer | Substandard | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Substandard | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Substandard | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,111
Prior | Total consumer | Doubtful | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Loss | Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	74
Prior | Total consumer | Loss | Home equity lines
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Prior | Total consumer | Loss | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 0

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses (Schedule of Allowances for Loan Losses and Recorded Investment in Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Allowance for loan losses:
Beginning balance	$ 281,402	$ 250,555
Impact from adoption of ASU 2016-13			$ 82,994
Charge-offs	(23,874)	(20,699)
Recoveries	3,813	3,611
Provision for loan losses	149,117	23,569
Ending balance	493,452	257,036
Commercial & Industrial
Allowance for loan losses:
Beginning balance	145,782	133,123
Impact from adoption of ASU 2016-13			(2,310)
Charge-offs	(14,885)	(13,039)
Recoveries	1,741	1,990
Provision for loan losses	86,622	13,565
Ending balance	216,950	135,639
Commercial Real Estate
Allowance for loan losses:
Beginning balance	67,430	68,796
Impact from adoption of ASU 2016-13			(651)
Charge-offs	(1,017)	(1,233)
Recoveries	399	344
Provision for loan losses	40,956	1,102
Ending balance	107,117	69,009
Consumer
Allowance for loan losses:
Beginning balance	68,190	48,636
Impact from adoption of ASU 2016-13			$ 85,955
Charge-offs	(7,972)	(6,427)
Recoveries	1,673	1,277
Provision for loan losses	21,539	8,902
Ending balance	$ 169,385	$ 52,388

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details)	3 Months Ended
	Mar. 31, 2020USD ($)Contract	Mar. 31, 2019USD ($)Contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	104	45
Recorded Investment	$ 36,695,000	$ 7,507,000
Net charge-offs	$ 0	$ 0
Total commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	41	15
Recorded Investment	$ 7,198,000	$ 3,631,000
Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	36	13
Recorded Investment	$ 5,735,000	$ 2,682,000
Total commercial and industrial | Owner-occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	5	2
Recorded Investment	$ 1,463,000	$ 949,000
Total commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	9	7,000
Recorded Investment	$ 24,685,000	$ 1,275,000
Total commercial real estate | Investment properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	2	1
Recorded Investment	$ 23,070,000	$ 482,000
Total commercial real estate | 1-4 family properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	6	6
Recorded Investment	$ 1,166,000	$ 793,000
Total commercial real estate | Land and development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1
Recorded Investment	$ 449,000
Total consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	54	23
Recorded Investment	$ 4,812,000	$ 2,601,000
Total consumer | Consumer mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	6	4
Recorded Investment	$ 1,598,000	$ 1,342,000
Total consumer | Home equity lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	19	1
Recorded Investment	$ 1,239,000	$ 105,000
Total consumer | Other consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	29	18
Recorded Investment	$ 1,975,000	$ 1,154,000
Below Market Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	30,202,000	4,243,000
Below Market Interest Rate | Total commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	5,091,000	2,732,000
Below Market Interest Rate | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	3,724,000	1,783,000
Below Market Interest Rate | Total commercial and industrial | Owner-occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	1,367,000	949,000
Below Market Interest Rate | Total commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	24,243,000	1,275,000
Below Market Interest Rate | Total commercial real estate | Investment properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	23,070,000	482,000
Below Market Interest Rate | Total commercial real estate | 1-4 family properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	724,000	793,000
Below Market Interest Rate | Total commercial real estate | Land and development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	449,000
Below Market Interest Rate | Total consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	868,000	236,000
Below Market Interest Rate | Total consumer | Consumer mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	515,000	128,000
Below Market Interest Rate | Total consumer | Home equity lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	275,000	0
Below Market Interest Rate | Total consumer | Other consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	78,000	108,000
Other Concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	6,493,000	3,264,000
Other Concessions | Total commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	2,107,000	899,000
Other Concessions | Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	2,011,000	899,000
Other Concessions | Total commercial and industrial | Owner-occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	96,000	0
Other Concessions | Total commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	442,000	0
Other Concessions | Total commercial real estate | Investment properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0	0
Other Concessions | Total commercial real estate | 1-4 family properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	442,000	0
Other Concessions | Total commercial real estate | Land and development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Other Concessions | Total consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	3,944,000	2,365,000
Other Concessions | Total consumer | Consumer mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	1,083,000	1,214,000
Other Concessions | Total consumer | Home equity lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	964,000	105,000
Other Concessions | Total consumer | Other consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 1,897,000	$ 1,046,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020USD ($)reporting_unit	Mar. 31, 2019USD ($)
Business Acquisition [Line Items]
Number of reporting units | reporting_unit	2
Amortization expense | $	$ 2.6	$ 3.4
FCB Financial Holdings, Inc. | CDI
Business Acquisition [Line Items]
Useful life	10 years

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2019	$ 497,267
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2020	497,267
Community Banking Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2019	256,323
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2020	256,323
Wholesale Banking Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2019	171,636
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2020	171,636
Consumer Mortgages Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2019	44,877
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2020	44,877
Wealth Management Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2019	24,431
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2020	$ 24,431

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 69,900	$ 69,900
Accumulated Amortization	(16,868)	(14,229)
Net Carrying Value	53,032	55,671
CDI
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	57,400	57,400
Accumulated Amortization	(12,784)	(10,436)
Net Carrying Value	44,616	46,964
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,500	12,500
Accumulated Amortization	(4,084)	(3,793)
Net Carrying Value	$ 8,416	$ 8,707

Shareholders' Equity and Othe_3

Shareholders' Equity and Other Comprehensive Income (Loss) (Narrative) (Details) - Common Stock [Member] $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020USD ($)$ / sharesshares
Class of Stock [Line Items]
Share repurchased | $	$ 16.2
Shares repurchased (in shares) | shares	450,000
Share repurchased (in dollars per share) | $ / shares	$ 36.08

Shareholders' Equity and Othe_4

Shareholders' Equity and Other Comprehensive Income (Loss) (Dividends) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Equity [Abstract]
Cash dividends declared per share (in dollars per share)	$ 0.33	$ 0.30

Shareholders' Equity and Othe_5

Shareholders' Equity and Other Comprehensive Income (Loss) (Stock Option) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Quantity
Options outstanding (in shares)	2,811,000	3,037,000
Exercised (in shares)	(220,000)
Expired/canceled (in shares)	(6,000)
Weighted-Average Exercise Price Per Share
Weighted-average exercise price, options (in dollars per share)	$ 22.25	$ 22.74
Exercised (in dollars per share)	29.05
Expired/canceled (in dollars per share)	$ 20.99

Shareholders' Equity and Othe_6

Shareholders' Equity and Other Comprehensive Income (Loss) (Non-vested Shares/Units) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2020$ / sharesshares
Quantity
Non-vested, beginning balance (in shares) | shares	1,312
Granted (in shares) | shares	689
Quantity change by TSR factor (in shares) | shares	23
Dividend equivalents granted (in shares) | shares	12
Vested (in shares) | shares	(556)
Forfeited (in shares) | shares	(5)
Non-vested, ending balance (in shares) | shares	1,475
Weighted-Average Grant Date Fair Value Per Share
Non-vested, beginning balance (in dollars per share) | $ / shares	$ 39.28
Granted (in dollars per share) | $ / shares	36.63
Quantity change by TSR factor (in dollars per share) | $ / shares	36.63
Dividend equivalents granted (in dollars per share) | $ / shares	36.63
Vested (in dollars per share) | $ / shares	39.25
Forfeited (in dollars per share) | $ / shares	36.63
Non-vested, ending balance (in dollars per share) | $ / shares	$ 38.01

Shareholders' Equity and Othe_7

Shareholders' Equity and Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Balance	$ 4,941,690	$ 3,133,602
Other comprehensive income (loss), Net of Tax Amount	191,270	76,078
Balance	5,065,205	4,597,753
Accumulated other comprehensive income (loss)	(256,911)		$ (65,641)
Total
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Balance	65,641	(94,420)
Other comprehensive income (loss) before reclassifications	197,831	76,164
Amounts reclassified from AOCI	(6,561)	(86)
Other comprehensive income (loss), Net of Tax Amount	191,270	76,078
Balance	256,911	(18,342)
Net unrealized gains (losses) on investment securities available for sale
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Balance	83,666	(83,179)
Other comprehensive income (loss) before reclassifications	117,330	76,164
Amounts reclassified from AOCI	(6,472)	(56)
Other comprehensive income (loss), Net of Tax Amount	110,858	76,108
Balance	194,524	(7,071)
Net unrealized gains (losses) on investment securities available for sale | Valuation Allowance of Deferred Tax Assets
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Accumulated other comprehensive income (loss)	13,300
Net unrealized gains (losses) on cash flow hedges
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Balance	(18,487)	(12,137)
Other comprehensive income (loss) before reclassifications	80,501	0
Amounts reclassified from AOCI	(89)	0
Other comprehensive income (loss), Net of Tax Amount	80,412	0
Balance	61,925	(12,137)
Post-retirement unfunded health benefit
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Balance	462	896
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	0	(30)
Other comprehensive income (loss), Net of Tax Amount	0	(30)
Balance	462	$ 866
Net unrealized losses on cash flow hedges | Valuation Allowance of Deferred Tax Assets
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Accumulated other comprehensive income (loss)	$ 12,100

Fair Value Accounting (Financia

Fair Value Accounting (Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	$ 6,937,240	$ 6,778,670
Mortgage loans held for sale	119,841	115,173
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	335,737	371,592
State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	1,005	2,075
Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	145,975	327,400
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	19,918	19,855
Mortgage-backed securities issued by U.S. Government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	55,422	56,816
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	5,549,825	5,180,815
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	628,880	636,851
Corporate debt securities and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	125,622	146,725
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	19,918	19,855
Private equity investments	11,877	15,502
GGL/SBA loans servicing asset	0	0
Derivative assets	0	0
Trading liability for short positions		1,560
Earnout liability	0	0
Derivative liabilities	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,857	7,212
Investment securities available for sale	6,915,760	6,756,710
Private equity investments	0	0
GGL/SBA loans servicing asset	0	0
Derivative assets	466,401	140,016
Trading liability for short positions		0
Earnout liability	0	0
Derivative liabilities	184,021
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	1,562	2,105
Private equity investments	3,255	3,887
GGL/SBA loans servicing asset	3,149	3,040
Derivative assets	0	0
Trading liability for short positions		0
Earnout liability	11,016	11,016
Derivative liabilities	2,050
Fair Value, Measurements, Recurring Basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,857	7,212
Investment securities available for sale	6,937,240	6,778,670
Mortgage loans held for sale	119,841	115,173
Private equity investments	15,132	19,389
GGL/SBA loans servicing asset	3,149	3,040
Derivative assets	466,401	140,016
Trading liability for short positions		1,560
Earnout liability	11,016	11,016
Derivative liabilities	186,071	37,071
Fair Value, Measurements, Recurring Basis | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	637	2,486
Investment securities available for sale	335,737	371,592
Fair Value, Measurements, Recurring Basis | Other mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,582	1,284
Fair Value, Measurements, Recurring Basis | State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	680	65
Investment securities available for sale	1,005	2,075
Fair Value, Measurements, Recurring Basis | Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,913	3,227
Investment securities available for sale	145,975	327,400
Fair Value, Measurements, Recurring Basis | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	45	150
Fair Value, Measurements, Recurring Basis | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	19,918	19,855
Fair Value, Measurements, Recurring Basis | U.S. Government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	74,856	36,541
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities issued by U.S. Government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	55,422	56,816
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	5,549,825	5,180,815
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]
Investment securities available for sale	628,880	636,851
Fair Value, Measurements, Recurring Basis | Corporate debt securities and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	125,622	146,725
Fair Value, Measurements, Recurring Basis | Mutual funds and mutual funds held in rabbi trusts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mutual funds and mutual funds held in rabbi trusts	31,241	32,348
Fair Value, Measurements, Recurring Basis | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	19,918	19,855
Mortgage loans held for sale	0	0
Private equity investments	11,877	15,502
GGL/SBA loans servicing asset	0	0
Trading liability for short positions		1,560
Earnout liability	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Commercial mortgage-backed securities 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 1 | Other mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	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 | Asset-backed 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 | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	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	19,918	19,855
Fair Value, Measurements, Recurring Basis | Level 1 | U.S. Government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
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 | 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 | 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	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Corporate debt securities and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring Basis | Level 1 | Mutual funds and mutual funds held in rabbi trusts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mutual funds and mutual funds held in rabbi trusts	31,241	32,348
Fair Value, Measurements, Recurring Basis | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,857	7,212
Investment securities available for sale	6,915,760	6,756,710
Mortgage loans held for sale	119,841	115,173
Private equity investments	0	0
GGL/SBA loans servicing asset	0
Trading liability for short positions		0
Earnout liability	0	0
Derivative liabilities	184,021	34,732
Fair Value, Measurements, Recurring Basis | Level 2 | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	637	2,486
Investment securities available for sale	335,737	371,592
Fair Value, Measurements, Recurring Basis | Level 2 | Other mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,582	1,284
Fair Value, Measurements, Recurring Basis | Level 2 | State and municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	680	65
Investment securities available for sale	1,005	2,075
Fair Value, Measurements, Recurring Basis | Level 2 | Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,913	3,227
Investment securities available for sale	145,975	327,400
Fair Value, Measurements, Recurring Basis | Level 2 | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	45	150
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 | U.S. Government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	74,856	36,541
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]
Investment securities available for sale	55,422	56,816
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	5,549,825	5,180,815
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]
Investment securities available for sale	628,880	636,851
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate debt securities and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	124,060	144,620
Fair Value, Measurements, Recurring Basis | Level 2 | Mutual funds and mutual funds held in rabbi trusts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mutual funds and mutual funds held in rabbi trusts	0	0
Fair Value, Measurements, Recurring Basis | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Investment securities available for sale	1,562	2,105
Mortgage loans held for sale	0	0
Private equity investments	3,255	3,887
GGL/SBA loans servicing asset	3,149	3,040
Trading liability for short positions		0
Earnout liability	11,016	11,016
Derivative liabilities	2,050	2,339
Fair Value, Measurements, Recurring Basis | Level 3 | Commercial mortgage-backed securities 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 | Other mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	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 | Asset-backed 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 | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	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 | U.S. Government agency 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]
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 | 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	0	0
Fair Value, Measurements, Recurring Basis | Level 3 | Corporate debt securities and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	1,562	2,105
Fair Value, Measurements, Recurring Basis | Level 3 | Mutual funds and mutual funds held in rabbi trusts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mutual funds and mutual funds held in rabbi trusts	$ 0	$ 0

Fair Value Accounting (Mortgage

Fair Value Accounting (Mortgage Loans Held for Sale and Changes in Fair Value Included in Consolidated Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 116,268		$ 112,218
Fair value less aggregate unpaid principal balance	3,573		2,955
Mortgage loans held for sale	619	$ 356
Fair value
Financing Receivable, Impaired [Line Items]
Loans receivable held-for-sale	$ 119,841		$ 115,173

Fair Value Accounting (Changes

Fair Value Accounting (Changes in Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
GGL / SBA Loans Servicing Asset
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,040	$ 3,729
Included in earnings	(264)	(488)
Unrealized gains (losses) included in OCI	0	0
Additions	373	206
Settlements	0	0
Transfers out of Level 3		0
Ending balance	3,149	3,447
Total net losses for the period included in earnings attributable to the change in unrealized losses relating to assets/liabilities still held	0	0
Earnout Liability
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(11,016)	(14,353)
Included in earnings	0	0
Unrealized gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Transfers out of Level 3		0
Ending balance	(11,016)	(14,353)
Total net losses for the period included in earnings attributable to the change in unrealized losses relating to assets/liabilities still held	0	0
Visa Derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(2,339)	(1,673)
Included in earnings	0	0
Unrealized gains (losses) included in OCI	0	0
Additions	0	0
Settlements	289	307
Transfers out of Level 3		0
Ending balance	(2,050)	(1,366)
Total net losses for the period included in earnings attributable to the change in unrealized losses relating to assets/liabilities still held	0	0
Investment Securities Available for Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,105	1,785
Included in earnings	0	0
Unrealized gains (losses) included in OCI	(543)	196
Additions	0	0
Settlements	0	0
Transfers out of Level 3		0
Ending balance	1,562	1,981
Total net losses for the period included in earnings attributable to the change in unrealized losses relating to assets/liabilities still held	0	0
Private Equity Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,887	11,028
Included in earnings	(632)	28
Unrealized gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Transfers out of Level 3		1,575
Ending balance	3,255	9,481
Total net losses for the period included in earnings attributable to the change in unrealized losses relating to assets/liabilities still held	$ (632)	$ 28

Fair Value Accounting (Fair Val

Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, at fair value	$ 6,937,240	$ 6,778,670
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, at fair value	6,937,240	6,778,670
Investment Securities Available for Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	1,562	2,105	$ 1,981	$ 1,785
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, at fair value	1,562	2,105
Fair Value, Measurements, Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, at fair value	6,937,240	6,778,670
Fair Value, Measurements, Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, at fair value	1,562	$ 2,105
Fair Value, Measurements, Recurring Basis | Level 3 | Investment Securities Available for Sale | Discounted cash flow analysis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 1,562
Discount rate	7.01%
Forecasted average Prime reset rate	3.56%
Fair Value, Measurements, Recurring Basis | Level 3 | Private equity investments | Individual analysis of each investee company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 3,255
Fair Value, Measurements, Recurring Basis | Level 3 | GGL/SBA loans servicing asset | Discounted cash flow analysis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 3,149
Discount rate	12.16%
Prepayment speeds	16.10%
Fair Value, Measurements, Recurring Basis | Level 3 | Earnout liability | Option pricing methods and Monte Carlo simulation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 11,016
Fair Value, Measurements, Recurring Basis | Level 3 | Visa derivative liability | Discounted cash flow analysis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 2,050
Estimated timing of resolution of covered litigation and future cumulative deposits to the litigation escrow for settlement of the Covered Litigation	2 years
Fair Value, Measurements, Nonrecurring Basis | Level 3 | Other real estate | Third-party appraised value of real estate less estimated selling costs | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.00%
Estimated selling costs	0.00%
Fair Value, Measurements, Nonrecurring Basis | Level 3 | Other real estate | Third-party appraised value of real estate less estimated selling costs | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	1.00%
Estimated selling costs	10.00%
Fair Value, Measurements, Nonrecurring Basis | Level 3 | Other real estate | Third-party appraised value of real estate less estimated selling costs | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	1.00%
Estimated selling costs	7.00%
Fair Value, Measurements, Nonrecurring Basis | Level 3 | Other assets held for sale | Third-party appraised value less estimated selling costs or BOV | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.00%
Estimated selling costs	0.00%
Fair Value, Measurements, Nonrecurring Basis | Level 3 | Other assets held for sale | Third-party appraised value less estimated selling costs or BOV | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	76.00%
Estimated selling costs	10.00%
Fair Value, Measurements, Nonrecurring Basis | Level 3 | Other assets held for sale | Third-party appraised value less estimated selling costs or BOV | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	58.00%
Estimated selling costs	7.00%

Fair Value Accounting (Assets M

Fair Value Accounting (Assets Measured at Fair Value on Non-Recurring Basis) (Details) - Fair Value, Measurements, Nonrecurring Basis - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	$ 460	$ 8,023
MPS receivable	18,490	21,437
Other assets held for sale	1,206	1,238
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
MPS receivable	0	0
Other assets held for sale	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
MPS receivable	0	0
Other assets held for sale	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	460	8,023
MPS receivable	18,490	21,437
Other assets held for sale	$ 1,206	$ 1,238

Fair Value Accounting (Fair V_2

Fair Value Accounting (Fair Value Adjustments Recognized in Earnings for Assets Measured at Fair Value on a Non-recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Other real estate	$ 15,200		$ 14,400
Fair Value, Measurements, Nonrecurring Basis | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	5	$ 18
Fair Value, Measurements, Nonrecurring Basis | MPS receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	2,663	0
Fair Value, Measurements, Nonrecurring Basis | Other assets held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value adjustment	$ 1,391	$ 96

Fair Value Accounting (Carrying

Fair Value Accounting (Carrying and Estimated Fair Values of Financial Instruments Carried on Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial assets
Investment securities available for sale	$ 6,937,240	$ 6,778,670
Loans, net	37,764,572	36,881,048
Financial liabilities
Non-interest-bearing deposits	9,659,451	9,439,485
Total deposits	39,826,585	38,405,504
Federal funds purchased and securities sold under repurchase agreements	312,776	165,690
Other short-term borrowings	1,175,000	1,753,560
Long-term debt	3,152,339	2,153,897
Mortgage loans held for sale
Financial assets
Loans receivable held-for-sale	119,841	115,173
Level 1
Financial assets
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	1,823,834	1,186,918
Trading securities	0	0
Investment securities available for sale	19,918	19,855
Private equity investments	11,877	15,502
Mutual funds and mutual funds held in rabbi trusts	31,241	32,348
Loans, net	0	0
GGL/SBA loans servicing asset	0	0
Derivative assets	0	0
Financial liabilities
Non-interest-bearing deposits	0	0
Non-time interest-bearing deposits	0	0
Time deposits	0	0
Total deposits	0	0
Federal funds purchased and securities sold under repurchase agreements	312,776	165,690
Trading liability for short positions		1,560
Other short-term borrowings	0	0
Long-term debt	0	0
Earnout liability	0	0
Derivative liabilities	0	0
Level 1 | Mortgage loans held for sale
Financial assets
Loans receivable held-for-sale	0	0
Level 2
Financial assets
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	0	0
Trading securities	4,857	7,212
Investment securities available for sale	6,915,760	6,756,710
Private equity investments	0	0
Mutual funds and mutual funds held in rabbi trusts	0	0
Loans, net	0	0
GGL/SBA loans servicing asset	0	0
Derivative assets	466,401	140,016
Financial liabilities
Non-interest-bearing deposits	9,659,451	9,439,485
Non-time interest-bearing deposits	21,305,350	19,891,711
Time deposits	8,934,652	9,112,459
Total deposits	39,899,453	38,443,655
Federal funds purchased and securities sold under repurchase agreements	0	0
Trading liability for short positions		0
Other short-term borrowings	1,175,000	1,752,000
Long-term debt	3,122,480	2,185,717
Earnout liability	0	0
Derivative liabilities	184,021
Level 2 | Mortgage loans held for sale
Financial assets
Loans receivable held-for-sale	119,841	115,173
Level 3
Financial assets
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	0	0
Trading securities	0	0
Investment securities available for sale	1,562	2,105
Private equity investments	3,255	3,887
Mutual funds and mutual funds held in rabbi trusts	0	0
Loans, net	38,168,063	36,931,256
GGL/SBA loans servicing asset	3,149	3,040
Derivative assets	0	0
Financial liabilities
Non-interest-bearing deposits	0	0
Non-time interest-bearing deposits	0	0
Time deposits	0	0
Total deposits	0	0
Federal funds purchased and securities sold under repurchase agreements	0	0
Trading liability for short positions		0
Other short-term borrowings	0	0
Long-term debt	0	0
Earnout liability	11,016	11,016
Derivative liabilities	2,050
Level 3 | Mortgage loans held for sale
Financial assets
Loans receivable held-for-sale	0	0
Carrying Value
Financial assets
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	1,823,834	1,186,918
Trading securities	4,857	7,212
Investment securities available for sale	6,937,240	6,778,670
Private equity investments	15,132	19,389
Mutual funds and mutual funds held in rabbi trusts	31,241	32,348
Loans, net	37,764,572	36,881,048
GGL/SBA loans servicing asset	3,149	3,040
Derivative assets	466,401	140,016
Financial liabilities
Non-interest-bearing deposits	9,659,451	9,439,485
Non-time interest-bearing deposits	21,305,350	19,891,711
Time deposits	8,861,784	9,074,308
Total deposits	39,826,585	38,405,504
Federal funds purchased and securities sold under repurchase agreements	312,776	165,690
Trading liability for short positions		1,560
Other short-term borrowings	1,175,000	1,752,000
Long-term debt	3,152,339	2,153,897
Earnout liability	11,016	11,016
Derivative liabilities	186,071	37,071
Carrying Value | Mortgage loans held for sale
Financial assets
Loans receivable held-for-sale	119,841	115,173
Fair Value
Financial assets
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	1,823,834	1,186,918
Trading securities	4,857	7,212
Investment securities available for sale	6,937,240	6,778,670
Private equity investments	15,132	19,389
Mutual funds and mutual funds held in rabbi trusts	31,241	32,348
Loans, net	38,168,063	36,931,256
GGL/SBA loans servicing asset	3,149	3,040
Derivative assets	466,401	140,016
Financial liabilities
Non-interest-bearing deposits	9,659,451	9,439,485
Non-time interest-bearing deposits	21,305,350	19,891,711
Time deposits	8,934,652	9,112,459
Total deposits	39,899,453	38,443,655
Federal funds purchased and securities sold under repurchase agreements	312,776	165,690
Trading liability for short positions		1,560
Other short-term borrowings	1,175,000	1,752,000
Long-term debt	3,122,480	2,185,717
Earnout liability	11,016	11,016
Derivative liabilities	186,071	37,071
Fair Value | Mortgage loans held for sale
Financial assets
Loans receivable held-for-sale	$ 119,841	$ 115,173

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Unrealized gains, before tax	$ 9,800,000
Unrealized gains, net	7,300,000
Income recognized	120,000
Cash flow hedge gain (loss) to be reclassified	32,000,000
Cash flow hedge termination gain	3,000,000
Collateral requirements	157,800,000	$ 84,600,000
Variation margin, amount reducing derivative asset	193,400,000	113,700,000
Foreign Currency Exchange Forwards
Derivative [Line Items]
Notional amount	$ 47,200,000	$ 32,900,000

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities (Impact of Derivatives on Balance Sheet) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Derivatives not designated as hedging instruments
Derivative [Line Items]
Fair Value of Derivative Assets	$ 376,155,000	$ 139,962,000
Fair Value of Derivative Liabilities	186,071,000	28,447,000
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative [Line Items]
Notional Amount	8,260,884,000	7,258,159,000
Fair Value of Derivative Assets	367,841,000	138,672,000
Fair Value of Derivative Liabilities	178,496,000	25,849,000
Derivatives not designated as hedging instruments | Mortgage derivatives | Interest rate lock commitments
Derivative [Line Items]
Notional Amount	412,218,000	70,481,000
Fair Value of Derivative Assets	8,314,000	1,290,000
Fair Value of Derivative Liabilities	0	0
Derivatives not designated as hedging instruments | Mortgage derivatives | Frward commitments to sell fixed-rate mortgage loans
Derivative [Line Items]
Notional Amount	330,000,000	107,000,000
Fair Value of Derivative Assets	0	0
Fair Value of Derivative Liabilities	5,097,000	168,000
Derivatives not designated as hedging instruments | Other contracts
Derivative [Line Items]
Notional Amount	159,412,000	145,764,000
Fair Value of Derivative Assets	0	0
Fair Value of Derivative Liabilities	428,000	91,000
Derivatives not designated as hedging instruments | Risk Derivative
Derivative [Line Items]
Notional Amount	2,900,000	3,000,000
Derivatives not designated as hedging instruments | Visa derivative
Derivative [Line Items]
Fair Value of Derivative Assets	0	0
Fair Value of Derivative Liabilities	2,050,000	2,339,000
Cash flow hedges
Derivative [Line Items]
Fair Value of Derivative Assets	90,246,000	54,000
Fair Value of Derivative Liabilities	0	8,624,000
Cash flow hedges | Interest rate contracts
Derivative [Line Items]
Notional Amount	2,750,000,000	2,000,000,000
Fair Value of Derivative Assets	90,246,000	54,000
Fair Value of Derivative Liabilities	$ 0	$ 8,624,000

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities (Effect Of Cash Flow Hedges On Consolidated Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Total amounts presented in the consolidated statements of income in interest income on loans	$ 3,637	$ 0
Interest rate contracts
Derivative [Line Items]
Realized gains (losses) reclassified from AOCI, pre-tax, to interest income on loans	120	0
Pre-tax income recognized on cash flow hedges	$ 120	$ 0

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities (Effect of Fair Value Hedges on Consolidated Statements of Income) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ 1,154	$ 576
Interest rate contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(604)	(130)
Interest rate contracts | Swap | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	2,500
Other contracts | Capital markets income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	(337)	0
Mortgage derivatives | Interest rate lock commitments | Mortgage banking income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	7,024	693
Mortgage derivatives | Frward commitments to sell fixed-rate mortgage loans | Mortgage banking income
Derivative [Line Items]
Gain (Loss) Recognized in Consolidated Statements of Income	$ (4,929)	$ 13

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
	Mar. 31, 2020	Mar. 31, 2019
Basic Net Income Per Common Share:
Net income available to common shareholders	$ 30,230	$ 117,036
Weighted average common shares outstanding (in shares)	147,311	160,927
Net income per common share, basic (in dollars per share)	$ 0.21	$ 0.73
Diluted Net Income Per Common Share:
Net income available to common shareholders	$ 30,230	$ 117,036
Weighted average common shares outstanding (in shares)	147,311	160,927
Effect of dilutive outstanding equity-based awards, warrants, and earnout payments	1,090	1,833
Weighted average number of diluted common shares (in shares)	148,401	162,760
Net income per common share, diluted (in dollars per share)	$ 0.20	$ 0.72

Net Income Per Common Share (Na

Net Income Per Common Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Potentially dilutive shares (in shares)	557	40

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Total allowance for loan losses	$ 493,452,000	$ 257,036,000		$ 281,402,000	$ 250,555,000
Carrying amount included in other assets	166,460,000			146,612,000
Amount of future funding commitments included in carrying amount	93,749,000			78,266,000
Short-term construction loans and letter of credit commitments	792,000			2,124,000
Funded portion of short-term loans and letters of credit	4,516,000			3,196,000
Contractual amount net of risk participations	32,000,000			33,000,000
Guarantor obligations, advanced payment from merchant	21,200,000			21,400,000
Guarantor obligations, advanced payment from merchant, reserve	2,700,000
Minimum
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	0
Maximum
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	5,000,000
Other assets held for sale
Loss Contingencies [Line Items]
Guarantor obligations, advanced payment from merchant	18,500,000
Guarantee obligations
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	13,021,539,000			13,117,770,000
Maximum potential exposure for sponsored transactions	18,370,000,000	$ 17,710,000,000
Letters of credit*
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	182,629,000			202,614,000
Commitments to fund commercial and industrial loans
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	6,994,969,000			7,018,152,000
Commitments to fund commercial real estate, construction, and land development loans
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	2,925,791,000			3,032,252,000
Commitments under home equity lines of credit
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	1,508,176,000			1,501,452,000
Unused credit card lines
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	940,016,000			877,929,000
Other loan commitments
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	469,958,000			485,371,000
ASU 2016-13
Loss Contingencies [Line Items]
Total allowance for loan losses			$ 281,402,000
ASU 2016-13 | Unfunded Loan Commitment
Loss Contingencies [Line Items]
Current Expected Credit Losses			$ 27,400,000
Total allowance for loan losses	$ 38,400,000			$ 1,400,000

Segment Reporting (Details)

Segment Reporting (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020USD ($)employee	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)employeesegment
Segment Reporting [Abstract]
Number of Reportable Segments | segment			3
Income Statement Related Disclosures [Abstract]
Net interest income	$ 373,260	$ 397,175
Non-interest revenue	103,857	79,378
Non-interest expense	276,279	292,410
Pre-provision net revenue	200,838
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	38,258,024		$ 37,162,450
Total deposits	$ 39,826,585		$ 38,405,504
Total full-time equivalent employees | employee	5,302,000		5,264,000
Operating Segments | Community Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 197,246
Non-interest revenue	33,449
Non-interest expense	75,304
Pre-provision net revenue	155,391
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	12,224,112		$ 12,170,914
Total deposits	$ 25,364,034		$ 25,610,777
Total full-time equivalent employees | employee	2,291,000		2,301,000
Operating Segments | Wholesale Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 123,170
Non-interest revenue	9,256
Non-interest expense	18,202
Pre-provision net revenue	114,224
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	18,691,302		$ 17,643,509
Total deposits	$ 9,111,207		$ 8,314,184
Total full-time equivalent employees | employee	237,000		213,000
Operating Segments | Financial Management Services
Income Statement Related Disclosures [Abstract]
Net interest income	$ 16,782
Non-interest revenue	47,275
Non-interest expense	43,289
Pre-provision net revenue	20,768
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	5,344,276		$ 5,285,455
Total deposits	$ 266,839		$ 284,716
Total full-time equivalent employees | employee	838,000		839,000
Treasury and Corporate Other
Income Statement Related Disclosures [Abstract]
Net interest income	$ 36,062
Non-interest revenue	13,877
Non-interest expense	139,484
Pre-provision net revenue	(89,545)
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	1,998,334		$ 2,062,572
Total deposits	$ 5,084,505		$ 4,195,827
Total full-time equivalent employees | employee	1,936,000		1,911,000
Proforma
Income Statement Related Disclosures [Abstract]
Net interest income		397,175
Non-interest revenue		79,378
Non-interest expense		292,410
Pre-provision net revenue		184,143
Proforma | Operating Segments | Community Banking
Income Statement Related Disclosures [Abstract]
Net interest income		214,759
Non-interest revenue		32,776
Non-interest expense		74,816
Pre-provision net revenue		172,719
Proforma | Operating Segments | Wholesale Banking
Income Statement Related Disclosures [Abstract]
Net interest income		125,611
Non-interest revenue		6,758
Non-interest expense		15,019
Pre-provision net revenue		117,350
Proforma | Operating Segments | Financial Management Services
Income Statement Related Disclosures [Abstract]
Net interest income		28,865
Non-interest revenue		32,279
Non-interest expense		33,218
Pre-provision net revenue		27,926
Proforma | Treasury and Corporate Other
Income Statement Related Disclosures [Abstract]
Net interest income		27,940
Non-interest revenue		7,565
Non-interest expense		169,357
Pre-provision net revenue		$ (133,852)