Cadence Bancorporation 10-Q 11 May 20 2020 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 08, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Trading Symbol	CADE
Entity Registrant Name	Cadence Bancorporation
Entity Central Index Key	0001614184
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	001-38058
Entity Tax Identification Number	47-1329858
Entity Address, Address Line One	2800 Post Oak Boulevard
Entity Address, Address Line Two	Suite 3800
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056
City Area Code	713
Local Phone Number	871-4000
Entity Common Stock, Shares Outstanding		125,929,513
Entity Interactive Data Current	Yes
Title of 12(b) Security	Class A Common Stock
Security Exchange Name	NYSE
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 212,658	$ 252,447
Interest-bearing deposits with banks	391,362	725,343
Federal funds sold	5,331	10,974
Total cash and cash equivalents	609,351	988,764
Investment securities available-for-sale, amortized cost of $2,375,637 and allowance for credit losses of zero at March 31, 2020	2,461,644	2,368,592
FRB and FHLB stock	77,326	76,752
Loans held for sale	38,221	87,649
Loans, net of unearned income	13,392,191	12,983,655
Less: allowance for credit losses	(245,246)	(119,643)
Net loans	13,146,945	12,864,012
Premises and equipment, net	126,642	127,867
Cash surrender value of life insurance	184,552	183,400
Net deferred tax asset	40,303
Goodwill	43,061	485,336
Other intangible assets, net	99,721	105,613
Other assets	410,152	512,244
Total assets	17,237,918	17,800,229
Liabilities:
Noninterest-bearing deposits	3,959,721	3,833,704
Interest-bearing deposits	10,529,784	10,909,090
Total deposits	14,489,505	14,742,794
Federal Home Loan Bank advances	100,000	100,000
Senior debt	49,955	49,938
Subordinated debt	183,032	182,712
Junior subordinated debentures	37,351	37,445
Notes payable	2,102	2,078
Net deferred tax liability		24,982
Other liabilities	262,430	199,434
Total liabilities	15,124,375	15,339,383
Shareholders' equity:
Common stock $0.01 par value, authorized 300,000,000 shares; 133,115,699 shares issued and 125,897,827 shares outstanding at March 31, 2020 and 132,984,756 shares issued and 127,597,569 shares outstanding at December 31, 2019	1,331	1,330
Additional paid-in capital	1,874,126	1,873,063
Treasury stock, at cost, 7,217,872 shares and 5,387,187 shares, respectively	(130,725)	(100,752)
Retained earnings	88,138	572,503
Accumulated other comprehensive income	280,673	114,702
Total shareholders' equity	2,113,543	2,460,846
Total liabilities and shareholders' equity	$ 17,237,918	$ 17,800,229

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Available-for-sale securities, Amortized cost	$ 2,375,637	$ 2,345,791
Allowance for credit losses	$ 0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	133,115,699	132,984,756
Common Stock, Shares, Outstanding	125,897,827	127,597,569
Treasury stock, shares outstanding	7,217,872	5,387,187

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
INTEREST INCOME
Interest and fees on loans	$ 175,134	$ 205,751
Interest and dividends on securities:
Taxable	14,015	10,796
Tax-exempt	1,427	1,739
Other interest income	2,178	3,899
Total interest income	192,754	222,185
INTEREST EXPENSE
Interest on time deposits	12,744	17,186
Interest on other deposits	21,984	29,485
Interest on borrowed funds	4,558	6,225
Total interest expense	39,286	52,896
Net interest income	153,468	169,289
Provision for credit losses	83,429	11,210
Net interest income after provision for credit losses	70,039	158,079
NONINTEREST INCOME
Investment advisory revenue	5,605	5,642
Trust services revenue	4,815	4,335
Credit related fees	5,983	4,870
Service charges on deposit accounts	6,416	5,130
Bankcard fees	1,958	2,213
Payroll processing revenue	1,367	1,419
SBA income	1,908	1,449
Other service fees	1,912	2,104
Securities gains (losses), net	2,994	(12)
Other income	2,111	3,514
Total noninterest income	35,069	30,664
NONINTEREST EXPENSE
Salaries and employee benefits	48,807	53,471
Premises and equipment	10,808	10,958
Merger related expenses	1,282	22,000
Goodwill impairment	443,695
Intangible asset amortization	5,592	6,073
Other expense	27,469	20,938
Total noninterest expense	537,653	113,440
(Loss) income before income taxes	(432,545)	75,303
Income tax (benefit) expense	(33,234)	17,102
Net (loss) income	$ (399,311)	$ 58,201
Weighted average common shares outstanding (Basic)	126,630,446	130,485,521
Weighted average common shares outstanding (Diluted)	126,630,446	130,549,319
(Loss) earnings per common share (Basic)	$ (3.15)	$ 0.44
(Loss) earnings per common share (Diluted)	$ (3.15)	$ 0.44

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (399,311)	$ 58,201
Unrealized gains on securities available-for-sale:
Net unrealized gains, net of income taxes of $15,149 and $6,783	48,126	22,593
Less reclassification adjustments for gains (losses) realized in net income, net of income taxes of $710 and $(3)	2,284	(9)
Net change in unrealized gains on securities available-for-sale, net of tax	45,842	22,602
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:
Net unrealized gains (losses), net of income taxes of $40,919 and $11,112	126,314	37,011
Less reclassification adjustments for gains (losses) realized in net income, net of income taxes of $1,922 and $(348)	6,185	(1,160)
Net change in unrealized gains (losses) on derivative instruments, net of tax	120,129	38,171
Other comprehensive income, net of tax	165,971	60,773
Comprehensive (loss) income	$ (233,340)	$ 118,974

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net unrealized gains on securities available-for-sale, taxes	$ 15,149	$ 6,783
Reclassification adjustments for gains (losses) on securities available-for-sale realized in net income, taxes	710	(3)
Net unrealized gains (losses) on derivative instruments designated as cash flow hedges, taxes	40,919	11,112
Reclassification adjustments for gains (losses) on derivative instruments designated as cash flow hedges realized in net income, taxes	$ 1,922	$ (348)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Shares Outstanding	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated OCI
Balance at Dec. 31, 2018	$ 1,438,274		$ 836	$ 1,041,000	$ (22,010)	$ 461,360	$ (42,912)
Balance, Shares at Dec. 31, 2018		82,497
Net (loss) income	58,201					58,201
Equity-based compensation cost	1,188			1,188
Cash dividends declared	(22,727)					(22,727)
Dividend equivalents on restricted stock units	(125)					(125)
Purchase of treasury stock, at cost	(58,830)				(58,830)
Purchase of treasury stock, at cost, Shares		(3,002)
Issuance of common shares for State Bank acquisition	826,113		492	825,621
Issuance of common shares for State Bank acquisition, Shares		49,232
Value of stock warrants assumed from State Bank	251			251
Common stock issuance costs	(295)			(295)
Issuance of common shares for restricted stock unit vesting			1	(1)
Issuance of common shares for restricted stock unit vesting, Shares		35
Issuance of treasury stock shares for exercise of stock warrants				(7)	7
Other comprehensive income	60,773						60,773
Balance at Mar. 31, 2019	2,302,823		1,329	1,867,757	(80,833)	496,709	17,861
Balance, Shares at Mar. 31, 2019		128,762
Balance at Dec. 31, 2019	2,460,846		1,330	1,873,063	(100,752)	572,503	114,702
Balance, Shares at Dec. 31, 2019		127,598
Net (loss) income	(399,311)					(399,311)
Cumulative effect from adopting new accounting standard (Note 4)	(62,779)					(62,779)
Equity-based compensation cost	1,063			1,063
Cash dividends declared	(22,139)					(22,139)
Dividend equivalents on restricted stock units	(136)					(136)
Purchase of treasury stock, at cost	(29,973)				(29,973)
Purchase of treasury stock, at cost, Shares		(1,831)
Issuance of common shares for restricted stock unit vesting	1		1
Issuance of common shares for restricted stock unit vesting, Shares		131
Other comprehensive income	165,971						165,971
Balance at Mar. 31, 2020	$ 2,113,543		$ 1,331	$ 1,874,126	$ (130,725)	$ 88,138	$ 280,673
Balance, Shares at Mar. 31, 2020		125,898

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share	$ 0.175	$ 0.175

UNAUDITED CONDENSED CONSOLIDATE

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Cash Flows [Abstract]
CASH FLOWS FROM OPERATING ACTIVITIES	$ 409,335	$ (85,013)
CASH FLOWS FROM INVESTING ACTIVITIES
Cash received in acquisitions, net		414,342
Purchase of securities available-for-sale	(240,734)	(69,743)
Proceeds from sales of securities available-for-sale	37,884	138,354
Proceeds from maturities, calls and paydowns of securities available-for-sale	113,400	61,512
Purchases of other securities, net	(574)	(15,573)
Proceeds from sales of loans held for sale	46,866	16,984
Increase in loans, net	(436,758)	(229,830)
Purchase of premises and equipment	(2,742)	(3,081)
Proceeds from disposition of foreclosed property	1,182	3,180
Other, net	(1,871)	(1,068)
Net cash (used in) provided by investing activities	(483,347)	315,077
CASH FLOWS FROM FINANCING ACTIVITIES
Decrease in deposits, net	(253,289)	(606,131)
Net change in securities sold under agreements to repurchase		(23,587)
Net change in short term FHLB advances		245,000
Repurchase of common stock	(29,973)	(58,830)
Cash dividends paid on common stock	(22,139)	(22,727)
Net cash used in financing activities	(305,401)	(466,275)
Net decrease in cash and cash equivalents	(379,413)	(236,211)
Cash and cash equivalents at beginning of period	988,764	779,280
Cash and cash equivalents at end of period	609,351	543,069
Cash paid during the period for:
Interest	39,487	44,999
Income taxes (refunded) paid	(234)	81
Cash paid for amounts included in lease liabilities	2,767	2,872
Non-cash investing activities (at fair value):
Acquisition of real estate and other assets in settlement of loans	11,162	599
Transfers of loans held for sale to loans	10,500	17,678
Transfers of loans to loans held for sale		17,444
Securities sold, net, with settlement after quarter end	57,157
Right-of-use assets (remeasured) obtained in exchange for operating lease liabilities	$ (125)	$ 81,601

Summary of Accounting Policies

Summary of Accounting Policies	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Summary of Accounting Policies	Note 1—Summary of Accounting Policies Basis of Presentation and Consolidation The accompanying unaudited consolidated financial statements for the Company have been prepared in accordance with 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 accounting principles generally accepted in the United States of America (“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. These interim financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2019. Operating results for the period ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. The Company and its subsidiaries follow accounting principles generally accepted in the United States of America, including, where applicable, general practices within the banking industry. The unaudited consolidated financial statements include the accounts of the Company and its subsidiaries. Significant intercompany accounts and transactions have been eliminated in consolidation. The assessment of whether or not the Company has a controlling interest (i.e., the primary beneficiary) in a variable-interest entity (“VIE”) is performed on an on-going basis. All equity investments in non-consolidated VIEs are included in “other assets” in the Company’s consolidated balance sheets (see Note 15). Certain amounts reported in prior years have been reclassified to conform to the 2020 presentation. These reclassifications did not materially impact the Company’s consolidated balance sheets or consolidated statements of operations. In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 855, Subsequent Events Nature of Operations The Company’s primary subsidiary is the Bank. The Bank operates under a national bank charter and is subject to regulation by the Office of the Comptroller of the Currency (“OCC”). The Bank provides full banking services in six southern states: Alabama, Florida, Georgia, Mississippi, Tennessee, and Texas. The Bank’s operating subsidiaries include: • Linscomb & Williams, Inc. — financial advisory firm; • Cadence Investment Services, Inc. — provides investment and insurance products; and • Altera Payroll and Insurance, Inc. — provides payroll processing services and the sale of certain insurance products. The Company and the Bank also have certain other non-operating and immaterial subsidiaries. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of goodwill, intangible assets, and deferred income taxes. Accounting Policies Related Party Transactions In the normal course of business, loans are made to directors and executive officers and to companies in which they have a significant ownership interest. In the opinion of management, these loans are made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other parties, are consistent with sound banking practices, and are within applicable regulatory and lending limitations. The aggregate balances of related party loans and deposits are insignificant as of March 31, 2020 and December 31, 2019. Loans and Allowances for Credit Losses (“ACL”) In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments Codification Improvements to Topic 326, Financial Instruments–Credit Losses Codification Improvements to Topic 326, Financial Instruments–Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments Financial Instruments–Credit Losses (Topic 326): Targeted Transition Relief Financial Instruments–Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates Codification Improvements to Topic 326, Financial Instruments–Credit Losses • Replaces the current incurred loss accounting model with an expected loss approach and requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. • Eliminates existing guidance for acquired credit impaired (“ACI”) loans and requires recognition of the nonaccretable difference as an increase to the allowance for expected credit losses on financial assets purchased with more than insignificant credit deterioration since origination, referred to as purchase credit deteriorated (“PCD”) assets, which will be offset by an increase in the amortized cost of the related loans. For ACI loans accounted for under ASC 310-30 prior to adoption, the guidance in this amendment for PCD assets will be prospectively applied. • Requires inclusion of expected recoveries, limited to the cumulative amount of prior write-offs, when estimating the allowance for credit losses for in-scope financial assets (including collateral dependent assets). • Amends existing impairment guidance for available-for-sale securities to incorporate an allowance, which will allow for reversals of credit impairments if the credit of an issuer improves. • Requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. The amendments in these updates became effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. The Company adopted ASC 326 effective January 1, 2020, using the cumulative effect method. As a result of this adoption, the Company recognized an adjustment to retained earnings of $62.8 million, recorded a deferred tax asset of $19.5 million, and reclassed ACL of $6.1 million with respect to PCD loans, formerly ACI loans, as of January 1, 2020. Because the Company adopted ASC 326 with a cumulative effect adjustment as of January 1, 2020, the comparative results as of December 31, 2019, and for the three months ended March 31, 2019, have not been restated and continue to be reported under the incurred loss accounting model. The Company has elected the transition provisions provided by the banking agencies and will phase in the “Day One” regulatory capital effects resulting from adoption of CECL. See Note 12 for additional disclosure. Other changes to the Company’s significant accounting policies pertaining to Loans and the ACL as incorporated under ASC 326 are as follows: • In accordance with ASC 326, the Company uses amortized cost as a basis for determining the ACL; whereas, prior to adopting ASC 326, under the incurred loss accounting model the Company used recorded investment. The components of amortized cost include unpaid principal balance (“UPB”), and unamortized discounts and premiums. As permitted by ASC 326, the Company has elected to not include accrued interest receivable in the determination of amortized cost and measurement of expected credit losses and, instead, has an accounting policy to write off accrued interest deemed uncollectible in a timely manner. • ASC 326 provides special initial recognition and measurement for the Day One accounting for PCD assets. o ASC 326 requires entities that purchase certain financial assets (or portfolios of financial assets) with the intention of holding them for investment to determine whether the assets have experienced more-than-insignificant deterioration in credit quality since origination. o More-than-insignificant deterioration will generally be determined by the asset’s delinquency status, risk rating changes, credit rating, accruing status or other indicators of credit deterioration since origination. o An entity initially measures the amortized cost of a PCD asset by adding the acquisition date estimate of expected credit losses to the asset’s purchase price. Because the initial estimate for expected credit losses is added to the purchase price to establish the Day One amortized cost, PCD accounting is commonly referred to as a “gross-up” approach. There is no credit loss expense recognized upon acquisition of a PCD asset; rather the “gross-up” is offset by establishment of the initial allowance. o After initial recognition, the accounting for a PCD asset will generally follow the credit loss model. o Interest income for a PCD asset is recognized using the effective interest rate (“EIR”) calculated at initial measurement. This EIR is determined by comparing the amortized cost basis of the instrument to its contractual cash flows, consistent with ASC 310-20. Accordingly, since the PCD gross-up is included in the amortized cost, the purchase discount related to estimated credit losses on acquisition is not accreted into interest income. Only any noncredit-related discount or premium is accreted or amortized, using the EIR that was calculated at the time the asset was acquired. • Commercial loans are generally placed on nonaccrual status when principal or interest is past due 90 days or more unless the loan is well secured and in the process of collection. Consumer loans, including residential first and second lien loans secured by real estate, are generally placed on nonaccrual status when they are 120 or more days past due. Prior to the adoption of ASC 326, the majority of our current PCD loans were treated as accruing loans as the Company was able to reasonably predict future cash flows at the unit of account or pool level. After adoption, the accruing status of each individual loan will be subject to the nonaccrual polices described above. • The accrual of interest, as well as the amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium, is generally discontinued at the time the loan is placed on nonaccrual status. All accrued but uncollected interest for loans that are placed on nonaccrual status is reversed through interest income. Cash receipts received on nonaccrual loans are generally applied against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income (i.e., cost recovery method). However, interest may be accounted for under the cash-basis method as long as the remaining amortized costs in the loan is deemed fully collectible. The ACL is maintained through charges to income in the form of a provision for credit losses at a level management believes is adequate to absorb an estimate of expected credit losses over the contractual life of the loan portfolio as of the reporting date. Events that are not within the Company’s control, such as changes in economic factors, could change subsequent to the reporting date and could cause the ACL to be overstated or understated. The amount of the ACL is affected by loan charge-offs, which decrease the ACL; recoveries on loans previously charged off, which increase the ACL; and the provision for credit losses charged to income, which increases the ACL. The following is a description of the Company’s process for estimating the ACL for all loans in its portfolio, including PCD loans: • The quantitative component of the Company’s ACL model includes three segments: commercial (“C&I”), commercial real estate (“CRE”), and consumer. o The C&I loan segment includes loans to clients in specialized industries, including restaurant, healthcare, and technology. Additional commercial lending activities include energy, general corporate loans, business banking and community banking loans. The C&I segment uses loan level through-the-cycle probability-of-default (“PD”) and loss-given-default (“LGD”) ratings generated by Cadence’s scorecards. These PD ratings are conditioned by industry to reflect the effect of certain forecasted macroeconomic variables, such as market value and volatility, interest rate spreads, and unemployment rate. o The CRE loan segment includes loans which are secured by a variety of property types, including multi-family dwellings, office buildings, industrial properties, and retail facilities. The Company offers construction financing, acquisition or refinancing of properties primarily located in our markets in Texas and the southeast United States. The CRE loan segment uses a loss-rate model, where lifetime loss rates are correlated closely with characteristics such as origination LTV, vintage/origination quality, and loan age, as well as with macroeconomic factors, including GDP growth rate, unemployment rate, and CRE market price change. o The consumer loan segment primarily consists of one-to-four family residential real estate loans with terms ranging from 10 to 30 years; however, the portfolio is heavily weighted to the 30-year term. The Company offers both fixed and adjustable interest rates and does not originate subprime loans. These loans are typically closed-end first lien loans for purposes of purchasing property, or for refinancing existing loans with or without cash out. Our loans are primarily owner occupied, full documentation loans. This segment also offers consumer loans to our customers for personal, family and household purposes, auto, boat and personal installment loans, however, these loans are a small percentage of the portfolio. The consumer loan segment uses a loss-rate model. Life-time loss rates capture the effect of credit score , loan age, size, and other loan characteristics and include Cadence’s own assumptions for LGD and the expected life of the loan. The loss rates are also affected by macroeconomic variables such as the unemployment rate, retails sales percent change year-over-year, household employment percent change year-over-year, FHFA home price index, housing affordability index at origination, and median house price. o When foreclosure of collateral securing a loan is probable, ASC 326 requires that the expected credit loss on a loan be measured based on the fair value of the collateral. When management’s measured value of the impaired loan is less than the amortized cost in the loan, the amount of the impairment is recorded as a specific reserve. These specific reserves are determined on an individual loan basis based on management’s current evaluation of the loss exposure for each credit, given the payment status, the financial condition of the borrower and any guarantors and the value of any underlying collateral. Loans that are individually evaluated are excluded from the collective evaluations described above. Changes in specific reserves from period to period are the result of changes in the circumstances of individual loans such as charge-offs, payments received, changes in collateral values or other factors. o For any collateral dependent loan where foreclosure is not probable, but repayment is expected to be provided primarily from the sale or operation of the collateral and the borrower is experiencing financial difficulty, a practical expedient for measuring the credit loss is allowed using the fair value of the collateral. The Company expects to elect this for qualifying credits particularly when there are unique risk characteristics which prohibit them from being collectively evaluated. When repayment will be from the operation of the collateral, generally fair value is estimated on the present value of expected cash flows from the operation of the collateral (an income approach). When repayment is expected from the sale of the collateral, the present value of the costs to sell will be deducted from the fair value of the collateral measured as of the measurement date. • As described above, loans included in each segment are collectively or individually evaluated to determine an expected credit loss which is allocated to the individual loans. Due to the growth of the credit portfolio into new geographic areas and into new commercial markets and the lack of seasoning of the portfolio, the Company recognizes there is limited historical loss information to adequately estimate loss rates based primarily on the Company’s historical loss data. Therefore, external loss data was acquired from the research arm of a nationally recognized risk rating agency to act as a proxy for loss rates within the ACL models until sufficient loss history can be accumulated from the Company’s loss experience in these segments. These loss rates were developed specifically for the Company’s customer risk profile and portfolio mix. • ASC 326 acknowledges that, because historical experience may not fully reflect an institution's expectations about the future, the institution should adjust historical loss information, as necessary, to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information. The quantitative models use baseline macroeconomic scenario forecast data provided by a nationally recognized rating agency for a reasonable and supportable period in estimating the current expected credit losses. The Company has elected an input reversion approach whereby the selected economic forecast for the identified macroeconomic variables revert to their historical trends. As a rule, the forecasts revert to their long-term equilibrium within two to five years or one “business cycle” depending on the segment The Company monitors actual loss experience for each loan segment for adjustments required to the loss rates utilized. • Additionally, to adjust historical credit loss information for current conditions and reasonable and supportable forecasts, all significant factors relevant to determining the expected collectability of financial assets as of each reporting date should be considered. ASC 326 provides examples of factors an institution may consider. The banking regulatory agencies believe the qualitative or environmental factors identified in the December 2006 Interagency Policy Statement on the Allowance for Loan and Lease Losses should continue to be relevant under CECL and are covered by the examples of factors that may be considered under ASC 326. These factors require judgments that cannot be subjected to exact mathematical calculation. There are no formulas for translating them into a basis-point adjustment to be applied to historical losses. The adjustment must reflect management’s overall estimate of the extent to which expected losses on a segment of loans will differ from historical loss experience. It would include management’s opinion on the effects related to current conditions and reasonable and supportable forecasts, that are not already reflected in the quantitative loss estimate. These adjustments are highly subjective estimates that will be determined each quarter. To facilitate this process, management has developed certain analyses of selected internal and external data to assist management in determining the risk of imprecision. These primary adjustment factors include, but are not limited to the following: o Lending policies, procedures, practices or philosophy, including underwriting standards and collection, charge-off and recovery practices o Changes in national and service market economic and business conditions that could affect the level of default rates or the level of losses once a default has occurred within the Bank’s existing loan portfolio o Changes in the nature or size of the portfolio o Changes in portfolio collateral values o Changes in the experience, ability, and depth of lending management, and other relevant staff o Volume and/or severity of past due and classified credits or trends in the volume of losses, non-accrual credits, impaired credits, and other credit modifications o Quality of the institution’s credit review system and processes and the degree of oversight by bank management and the board of directors o Concentrations of credit such as industry and lines of business o Competition and legal and regulatory requirements or other external factors • The reserve for unfunded commitments is determined by assessing three distinct components: unfunded commitment volatility in the portfolio (excluding commitments related to letters of credit and commitment letters), adversely rated letters of credit, and adversely rated lines of credit. Unfunded commitment volatility is calculated on a trailing nine quarter basis; the resulting expected funding amount is then reserved for based on the current combined reserve rate of the funded portfolio. Adverse letters and lines of credit are assessed individually based on funding and loss expectations as of the period end. The reserve for unfunded commitments is recorded in other liabilities and the provision for losses on unfunded commitments is included in the provision for credit losses. Prior to adoption, the provision for losses on unfunded commitments was recorded in other noninterest expense. As of March 31, 2020, and December 31, 2019, the reserve for unfunded commitments totaled $3.2 million and $2.0 million, respectively. Recently Adopted Accounting Pronouncements In January 2017, the FASB issued ASU No. 2017-04, Intangibles–Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework–Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-15, Intangibles–Goodwill and Other–Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force) . This standard aligns the requirements for capitalizing implementation costs in a hosting arrangement service contract with the existing guidance for capitalizing implementation costs incurred for an internal-use software license. This standard also requires capitalizing or expensing implementation costs based on the nature of the costs and the project stage during which they are incurred and establishes additional disclosure requirements. This standard became effective for Cadence on January 1, 2020. The adoption of this guidance had no material impact on the consolidated financial statements. In October 2018, the FASB issued ASU No. 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities In April 2019, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments–Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments The credit losses and hedging amendments have the same effective dates as the respective standards, unless an entity has already adopted the standards. The adoption of the credit loss standard, or CECL, is discussed above. Since the Company early adopted the guidance in ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities In February 2020, the FASB issued ASU No. 2020-02, Financial Instruments—Credit Losses (Topic 326) and Leases (Topic 842)—Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842) (SEC Update) In March 2020, the FASB issued ASU No. 2020-03, Codification Improvements to Financial Instruments In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting P ending Accounting Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)—Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the FASB Emerging Issues Task Force)

Business Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Business Combinations	Note 2 – Business Combinations State Bank On January 1, 2019, the Company acquired all the outstanding stock of State Bank Financial Corporation (“State Bank”) of Atlanta, Georgia in a stock transaction. The Company completed the accounting for the acquisition of State Bank and the measurement period was closed on December 31, 2019. The acquisition added $3.3 billion in loans and $4.1 billion in deposits. State Bank operated 32 branch locations across Georgia. Under the terms of the transaction, State Bank shareholders received 1.271 shares of the Company’s Class A common stock in exchange for each share of State Bank common stock resulting in the Company issuing 49.2 million shares of its Class A common stock. In total, the purchase price for State Bank was $826.4 million, including $826.1 million in the Company’s common stock and $0.3 million representing the fair value of unexercised warrants. The following table provides the purchase price allocation and the consideration paid for State Bank’s net assets. (In thousands, except shares and per share data) As Recorded by Cadence Assets Cash and cash equivalents $ 414,342 Investment securities available-for-sale 667,865 Loans held for sale 148,469 Loans 3,317,897 Premises and equipment 65,646 Cash surrender value of life insurance 69,252 Intangible assets 117,038 Other assets 47,146 Total assets acquired $ 4,847,655 Liabilities Deposits $ 4,096,665 Short term borrowings 23,899 Other liabilities 76,368 Total liabilities assumed 4,196,932 Net identifiable assets acquired over liabilities assumed 650,723 Goodwill 175,657 Net assets acquired over liabilities assumed $ 826,380 Consideration: Cadence Bancorporation common shares issued 49,232,008 Fair value per share of the Company's common stock $ 16.78 Company common stock issued 826,113 Fair value of unexercised warrants 267 Fair value of total consideration transferred $ 826,380 The Company estimated the fair value of loans by utilizing the discounted cash flow method applied to pools of loans aggregated by product categories and interest rate type. In addition, certain cash flows were estimated on an individual loan basis based on current performance and collateral value, if the loan was collateral dependent. Contractual principal and interest cash flows were projected based on the payment type (i.e., amortizing or interest only), interest rate type (i.e., fixed or adjustable), interest rate index, weighted average maturity, weighted average interest rate, weighted average spread, and weighted average interest rate floor of each loan pool. The expected cash flows for each category were determined by estimating future credit losses using probabilities of default (PD), loss given default (LGD) and the rate of prepayments. Projected monthly cash flows were then discounted to present value based on discount rates developed from various sources including an analysis of State Bank’s newly originated loans, a buildup approach and market data. There was no carryover of State Bank’s ACL associated with the loans acquired. Intangible assets consisted of the core deposit intangible and the customer relationship intangible of a subsidiary. The core deposit intangible asset recognized of $111.9 million is being amortized over its estimated useful life of ten years utilizing an accelerated method. The benefit of the deposit base is equal to the difference in cash flows between maintaining the existing deposits and obtaining alternative funds over the life of the deposit base. The difference was tax effected and discounted to present value at a risk-adjusted discount rate. The valuation of the core deposit base includes estimates of the attrition rates for each deposit type based on historical attrition data and market participant information, in addition to estimates of total costs including interest cost, net maintenance cost, cost of reserves, and cost of float. The customer relationship and trademark intangible recognized of $3.7 million and $1.4 million are being amortized over estimated useful lives of ten and twenty years, respectively, using an accelerated method. Goodwill of $175.7 million was recorded as a result of the transaction and is not amortized for financial statement purposes. All the goodwill was assigned to the Banking segment. The goodwill recorded is not deductible for income tax purposes. See also Note 5, Goodwill and Other Intangible Assets. Certificates of deposit, including IRAs, were valued by projecting out the expected cash flows based on the contractual terms of the certificates of deposit. The fair values of savings and transaction deposit accounts were assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. These cash flows were discounted using the interest rates on fixed maturity deposits offered by Cadence and State Bank as of January 1, 2019 resulting in a $3.4 million discount amortized over a twelve-month Unfunded commitments are contractual obligations by a financial institution for future funding as it relates to closed end or revolving lines of credit. The Company valued these unfunded commitments at $26.8 million and recorded a liability using the “Netback” method. Wealth & Pension On July 1, 2019, the Company’s wholly owned subsidiary, Linscomb & Williams, Inc., acquired certain assets and assumed certain liabilities of Wealth and Pension Services Group, Inc. (“W&P”), a fee-based investment advisory firm with its principal office in Atlanta, Georgia. The total purchase consideration paid of $8.0 million included an initial cash payment of $5.2 million and future cash payments totaling approximately $2.1 million to be paid in installments over a five-year

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2020
Investments Debt And Equity Securities [Abstract]
Investment Securities	Note 3—Investment Securities A summary of amortized cost and estimated fair value of securities available-for-sale at March 31, 2020 and December 31, 2019 is as follows: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value March 31, 2020 Securities available-for-sale: Obligations of U.S. government agencies $ 70,225 $ 221 $ 458 $ 69,988 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 99,869 2,799 — 102,668 Issued by FNMA and FHLMC 1,453,735 52,507 — 1,506,242 Other residential mortgage-backed securities 268,906 11,249 — 280,155 Commercial mortgage-backed securities 271,590 11,580 941 282,229 Total MBS 2,094,100 78,135 941 2,171,294 Obligations of states and municipal subdivisions 211,312 9,431 381 220,362 Total securities available-for-sale $ 2,375,637 $ 87,787 $ 1,780 $ 2,461,644 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value December 31, 2019 Securities available-for-sale: Obligations of U.S. government agencies $ 69,464 $ 57 $ 415 $ 69,106 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 98,122 1,205 245 99,082 Issued by FNMA and FHLMC 1,423,771 13,128 1,402 1,435,497 Other residential mortgage-backed securities 292,019 4,197 384 295,832 Commercial mortgage-backed securities 276,533 2,448 3,023 275,958 Total MBS 2,090,445 20,978 5,054 2,106,369 Obligations of states and municipal subdivisions 185,882 7,235 — 193,117 Total securities available-for-sale $ 2,345,791 $ 28,270 $ 5,469 $ 2,368,592 The scheduled contractual maturities of securities available-for-sale at March 31, 2020 were as follows: Amortized Estimated (In thousands) Cost Fair Value Due in one year or less $ 1,222 $ 1,226 Due after one year through five years 1,157 1,148 Due after five years through ten years 61,915 61,672 Due after ten years 217,243 226,304 Mortgage-backed securities 2,094,100 2,171,294 Total $ 2,375,637 $ 2,461,644 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. There were no other-than-temporary impairment charges included in gross realized losses for the three months ended March 31, 2020 and 2019. The specific identification method is used to reclassify gains and losses out of other comprehensive income at the time of sale. For the Three Months Ended March 31, (In thousands) 2020 2019 Gross realized gains $ 2,994 $ 3 Gross realized losses — (15 ) Realized gains (losses), net $ 2,994 $ (12 ) Securities with a carrying value of $728.7 million and $629.4 million at March 31, 2020 and December 31, 2019, respectively, were pledged to secure public deposits, FHLB borrowings, repurchase agreements and for other purposes as required or permitted by law. Information pertaining to Unrealized Loss Analysis Losses < 12 Months Losses > 12 Months (In thousands) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses March 31, 2020 Obligations of U.S. government agencies $ 29,360 $ 278 $ 12,896 $ 180 Mortgage-backed securities 72,267 574 10,143 367 Obligations of states and municipal subdivisions 22,495 381 — — Total $ 124,122 $ 1,233 $ 23,039 $ 547 Unrealized Loss Analysis Losses < 12 Months Losses > 12 Months (In thousands) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses December 31, 2019 Obligations of U.S. government agencies $ 33,053 $ 209 $ 13,703 $ 206 Mortgage-backed securities 708,991 4,466 61,506 588 Obligations of states and municipal subdivisions — — — — Total $ 742,044 $ 4,675 $ 75,209 $ 794 As of March 31, 2020 and December 31, 2019, approximately 6% and 35%, respectively, of the fair value of securities in the investment portfolio reflected an unrealized loss. As of March 31, 2020, there were 10 securities that had been in a loss position for more than twelve months, and 17 securities that had been in a loss position for less than 12 months. As of March 31, 2020, the unrealized losses were not deemed to be caused by credit-related issues. Credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. Any impairment that is not credit-related is recognized in other comprehensive income. None of the unrealized losses relate to the marketability of the securities or the issuer’s ability to honor redemption of the obligations. As of March 31, 2020, allowance for credit losses related to available-for-sale securities is zero as the decline in fair value did not result from credit-related issues. The Company has adequate liquidity and, therefore, does not plan to sell and, more likely than not, will not be required to sell these securities before recovery of the indicated impairment. Accordingly, the unrealized losses on these securities have been determined to be temporary.

Loans Held for Sale, Loans and

Loans Held for Sale, Loans and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Loans Held for Sale, Loans and Allowance for Credit Losses	Note 4—Loans Held for Sale, Loans and Allowance for Credit Losses Loans Held for Sale The following table presents a summary of the loans held for sale by portfolio segment at the lower of amortized cost or fair value as of March 31, 2020 and December 31, 2019. (In thousands) March 31, 2020 December 31, 2019 Commercial and industrial $ 33,023 $ 34,767 Commercial real estate 2,913 49,894 Consumer 2,285 2,988 Total loans held for sale (1) $ 38,221 $ 87,649 (1) $0.1 million and $0.4 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020 and December 31, 2019, respectively. Loans The following table presents total loans outstanding by portfolio segment and class of financing receivable as of March 31, 2020 and December 31, 2019. Outstanding balances include originated loans, Acquired Noncredit Impaired (“ANCI”) loans, and Purchase Credit Deteriorated (“PCD”) loans, formerly referred to as acquired credit impaired (“ACI”) loans. See Note 1 for additional information regarding the adoption of the new CECL accounting standard (2) (In thousands) March 31, 2020 December 31, 2019 Commercial and industrial General C&I $ 4,694,114 $ 4,517,016 Energy 1,480,497 1,419,957 Restaurant 1,082,602 1,027,421 Healthcare 492,097 474,264 Total commercial and industrial 7,749,310 7,438,658 Commercial real estate Industrial, retail, and other 1,754,881 1,691,694 Multifamily 692,168 659,902 Office 533,711 535,676 Total commercial real estate 2,980,760 2,887,272 Consumer Residential 2,576,073 2,568,295 Other 86,048 89,430 Total consumer 2,662,121 2,657,725 Total (1) $ 13,392,191 $ 12,983,655 (1) (2) Allowance for Credit Losses (“ACL”) Credit Risk Management . The Company’s credit risk management is overseen by the Company’s Board of Directors, including its Risk Management Committee, and the Company’s Senior Credit Risk Management Committee (“SCRMC”). The SCRMC is responsible for reviewing the Company’s credit portfolio management information, including asset quality trends, concentration reports, policy, financial and documentation exceptions, delinquencies, charge-offs, and nonperforming assets. The Company’s credit policy requires that key risks be identified and measured, documented and mitigated, to the extent possible, and requires various levels of internal approvals based on the characteristics of the loans, including the size of the exposure. The Company also has customized underwriting guidelines for loans in the Company’s specialized industries that the Company believes reflects the unique characteristics of these industries. Under the Company’s dual credit risk rating (“DCRR”) system, it is the Company’s policy to assign risk ratings to all commercial loan (C&I and CRE) exposures using the Company’s internal credit risk rating system. The assignment of loan risk ratings is the primary responsibility of the lending officer concurrent with approval from the credit officer reviewing and recommending approval of the credit. The assignment of commercial risk ratings is completed on a transactional basis using scorecards. The Company uses a total of nine different scorecards that accommodate various areas of lending. Each scorecard contains two main components: probability of default (“PD”) and loss given default (“LGD”). Each component is assessed using a multitude of both qualitative and quantitative scoring elements, which will generate a percentage for each component. The key elements assessed in the scorecard for PD are financial performance and trends as well as qualitative measures. The key elements for LGD are collateral quality and the structure of the loan. The PD percentage and LGD percentage are converted into PD and LGD risk ratings for each loan. The PD rating is used as the Company’s risk grade of record. Loans with PD ratings of 1 through 8 are loans that the Company rates internally as “Pass.” Loans with PD ratings of 9 through 13 are rated internally as “Criticized” and represent loans for which one or more potential or defined weaknesses exists. Loans with PD ratings of 10 through 13 are also considered “Classified” and represent loans for which one or more defined weaknesses exist. These classifications are consistent with regulatory guidelines. The following is a qualitative description of the Company’s loan classifications: • Pass—For loans within this risk rating, the condition of the borrower and the performance of the loan is satisfactory or better. • Pass/Watch—Borderline risk credits representing the weakest pass risk rating. Pass/Watch credits consist of credits where financial performance is weak, but stable. Weak performance is transitional. The borrower has a viable, defined plan for improvement. Generally, it is not expected for loans to be originated within this category. • Special Mention—A special mention loan has identified potential weaknesses that are of sufficient materiality to require management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or in the Bank’s credit position at some future date. Special mention assets contain greater than acceptable risk to warrant increases in credit exposure and are thus considered non-pass rated credits. • Substandard—A substandard loan is inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged, if any. Loans classified as substandard possess well-defined weaknesses that are expected to jeopardize their liquidation. Loans in this category may be either on accrual status or nonaccrual status. • Doubtful—Loans classified as doubtful possess all of the weaknesses inherent in loans classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full highly questionable or improbable based on currently existing facts, conditions, and values. Loans rated as doubtful are not rated as loss because certain events may occur that could salvage the debt. Loans in this category are required to be on nonaccrual. • Loss—Loans classified loss are considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification does not mean that the asset has absolutely no recovery or salvage value, but rather that it is not practical or desirable to defer writing off this worthless loan even though partial recovery may be affected in the future. Loans may reside in this classification for administrative purposes for a period not to exceed the earlier of thirty (30) days or calendar quarter-end. Consumer purpose loan risk classification is assigned in accordance with the Uniform Retail Credit Classification, based on delinquency and accrual status. An important aspect of the Company’s assessment of risk is the ongoing completion of periodic risk rating reviews. As part of these reviews, the Company seeks to review the risk ratings of each facility within a customer relationship and may recommend an upgrade or downgrade to the risk ratings. The Company’s policy is to review two times per year all customer relationships with an aggregate exposure of $10 million or greater as well as all shared national credits (“SNC”). Additionally, all customer relationships with an aggregate exposure of $2.5 million to $10.0 million are reviewed annually. Further, customer relationships with an aggregate exposure of $2.5 million and greater with pass/watch or criticized risk ratings are reviewed quarterly. Certain relationships are exempt from review, such as relationships where the Company’s exposure is cash-secured. An updated risk rating scorecard is required during each risk review as well as with any credit event that requires credit approval. The Company’s policies establish concentration limits for various industries within the commercial portfolio as well as commercial real estate, leveraged lending and other regulatory categories. Concentration limits are monitored and reassessed on a periodic basis and approved by the Board of Directors on an annual basis. The approval of the Company’s Senior Loan Committee is generally required for relationships in an amount greater than $5.0 million. For loans in an amount greater than $5.0 million that are risk rated 10 or worse, approval of the Credit Transition Committee is generally required. There is a credit executive assigned to each line of business who holds the primary responsibility for the approval process outside of the loan approval committees. ACL Rollforward and Analysis . The following tables provide a summary of the activity in the ACL and the Reserve for Unfunded Commitments for the three months ended March 31, 2020 and 2019 . For the Three Months Ended March 31, 2020 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Total Allowance for Credit Losses Reserve for Unfunded Commitments (1) Total As of December 31, 2019 $ 89,796 $ 15,319 $ 14,528 $ 119,643 $ 1,699 $ 121,342 Cumulative effect of adoption of CECL 32,951 20,599 22,300 75,850 332 76,182 As of January 1, 2020 122,747 35,918 36,828 195,493 2,031 197,524 Provision for credit losses 63,684 17,798 756 82,238 1,191 83,429 Charge-offs (31,987 ) (478 ) (633 ) (33,098 ) — (33,098 ) Recoveries 141 180 292 613 — 613 As of March 31, 2020 $ 154,585 $ 53,418 $ 37,243 $ 245,246 $ 3,222 $ 248,468 Allocation of ending ACL Loans collectively evaluated $ 135,486 $ 53,418 $ 37,243 $ 226,147 Loans individually evaluated 19,099 — — 19,099 ACL as of March 31, 2020 $ 154,585 $ 53,418 $ 37,243 $ 245,246 Loans (amortized cost) Loans collectively evaluated $ 7,609,527 $ 2,975,416 $ 2,659,630 $ 13,244,573 Loans individually evaluated 139,783 5,344 2,491 147,618 Loans as of March 31, 2020 (2) $ 7,749,310 $ 2,980,760 $ 2,662,121 $ 13,392,191 (1) The reserve for unfunded commitments is included in other liabilities on the consolidated balance sheets at March 31, 2020 and December 31, 2019. (2) $45.3 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020. For the Three Months Ended March 31, 2019 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Small Business Total Allowance for Credit Losses As of December 31, 2018 $ 66,316 $ 10,452 $ 13,703 $ 3,907 $ 94,378 Provision for credit losses 9,299 102 1,206 603 11,210 Charge-offs (461 ) (85 ) (234 ) (158 ) (938 ) Recoveries 372 — 15 1 388 As of March 31, 2019 (1) $ 75,526 $ 10,469 $ 14,690 $ 4,353 $ 105,038 Allocation of ending ACL Loans collectively evaluated for impairment $ 61,020 $ 10,462 $ 14,625 $ 4,294 $ 90,401 Loans individually evaluated for impairment 14,506 7 65 59 14,637 ACL as of March 31, 2019 (1) $ 75,526 $ 10,469 $ 14,690 $ 4,353 $ 105,038 Loans Loans collectively evaluated for impairment $ 7,389,053 $ 2,823,249 $ 2,637,416 $ 758,586 $ 13,608,304 Loans individually evaluated for impairment 92,635 6,946 2,102 256 101,939 Loans as of March 31, 2019 (1) $ 7,481,688 $ 2,830,195 $ 2,639,518 $ 758,842 $ 13,710,243 (1) As described in Note 1, the Company adopted the new CECL accounting standard on January 1, 2020 which increased the ACL by $75.9 million. The ACL was increased an additional $82.2 million in provision for the quarter which reflects the forecasted effects of COVID-19 on the various loan segments due to higher unemployment, lower GDP, market volatility, and real estate prices. The Company’s estimate of the ACL used the baseline pandemic scenario provided by a nationally recognized service released on April 4, 2020, as adjusted for consideration of certain qualitative and environmental factors. Loan charge-offs recognized during the first quarter of 2020 are higher than the first quarter of 2019 as a result of credit migration that has occurred primarily in the Restaurant and General C&I classes with the most significant impact being COVID related. The Company’s individually evaluated loans totaling $147.6 million at March 31, 2020 are considered collateral dependent loans and generally are considered impaired (Note 1). The majority of the these are within the C&I segment and include loans in the Energy, Restaurant, and General C&I classes. The majority of these loans are supported by an enterprise valuation or by collateral such as real estate, receivables or inventory, with the exception of loans within the Energy E&P sector which are secured by oil and gas reserves. Loans within the CRE and consumer segments are secured by commercial and residential real estate. Credit Quality The following table provides information by each credit quality indicator and by origination year (vintage) as of March 31, 2020. The Company defines origination year (vintage) for the purposes of disclosure as the year of execution of the original loan agreement. Loans that are modified as a TDR are considered to be a continuation of the original loan, therefore the origination date of the original loan is reflected as the vintage date. This presentation is consistent with the vintage determination used in the ACL model. The criticized loans with a 2020 vintage relate to credits in resolution. There were no line-of-credit arrangements converted to term loans during the period. Amortized Cost Basis by Origination Year (In thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Loans Total Commercial and industrial Pass $ 174,633 $ 796,988 $ 1,155,772 $ 713,223 $ 397,273 $ 738,601 $ 3,179,764 $ 7,156,254 Special mention 261 7,690 69,934 34,365 39,415 16,712 86,730 255,107 Substandard 583 5,949 76,623 26,435 35,471 58,585 114,862 318,508 Doubtful — 1,784 3,460 765 — 7,126 6,306 19,441 Total commercial and industrial 175,477 812,411 1,305,789 774,788 472,159 821,024 3,387,662 7,749,310 Commercial real estate Pass 109,070 406,225 737,092 692,826 274,966 562,834 141,895 2,924,908 Special mention 1,495 346 25,125 945 293 3,221 279 31,704 Substandard — 210 170 607 7,455 15,694 12 24,148 Doubtful — — — — — — — — Total commercial real estate 110,565 406,781 762,387 694,378 282,714 581,749 142,186 2,980,760 Consumer Current 79,008 471,638 646,405 356,462 320,817 504,905 252,225 2,631,460 30-59 days past due — 1,506 4,076 340 1,795 7,443 2,358 17,518 60-89 days past due — 309 1,134 76 1,075 1,494 221 4,309 90+ days past due — 147 2,159 8 1,540 4,980 — 8,834 Total consumer 79,008 473,600 653,774 356,886 325,227 518,822 254,804 2,662,121 Total (1) $ 365,050 $ 1,692,792 $ 2,721,950 $ 1,826,052 $ 1,080,100 $ 1,921,595 $ 3,784,652 $ 13,392,191 (1) $45.3 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020. Past Due The following tables provide an aging analysis of past due loans by portfolio segment and class of financing receivable. Age Analysis of Past-Due Loans as of March 31, 2020 90+ Days (In thousands) 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due Total Current Total (1) Past Due and Accruing Commercial and industrial General C&I $ 4,903 $ 794 $ 28,945 $ 34,642 $ 4,659,472 $ 4,694,114 $ 13 Energy — — — — 1,480,497 1,480,497 — Restaurant 871 8,413 6,634 15,918 1,066,684 1,082,602 24 Healthcare 1,201 52 2,504 3,757 488,340 492,097 — Total commercial and industrial 6,975 9,259 38,083 54,317 7,694,993 7,749,310 37 Commercial real estate Industrial, retail, and other 2,486 1,272 1,772 5,530 1,749,350 1,754,880 2 Multifamily — — — — 692,169 692,169 — Office 327 — 1,136 1,463 532,248 533,711 — Total commercial real estate 2,813 1,272 2,908 6,993 2,973,767 2,980,760 2 Consumer Residential 17,325 4,283 8,826 30,434 2,545,640 2,576,074 1,960 Other 193 26 8 227 85,820 86,047 — Total consumer 17,518 4,309 8,834 30,661 2,631,460 2,662,121 1,960 Total $ 27,306 $ 14,840 $ 49,825 $ 91,971 $ 13,300,220 $ 13,392,191 $ 1,999 (1) Age Analysis of Past-Due Loans as of December 31, 2019 90+ Days (In thousands) 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due Total Current Total (1) Past Due and Accruing Commercial and industrial General C&I $ 23,143 $ 1,117 $ 15,183 $ 39,443 $ 4,477,573 $ 4,517,016 $ 85 Energy — — 8,166 8,166 1,411,791 1,419,957 — Restaurant 1,219 1,284 8,021 10,524 1,016,897 1,027,421 108 Healthcare 497 41 4,143 4,681 469,583 474,264 — Total commercial and industrial 24,859 2,442 35,513 62,814 7,375,844 7,438,658 193 Commercial real estate Industrial, retail, and other 3,354 133 2,255 5,742 1,685,952 1,691,694 — Multifamily — — — — 659,902 659,902 — Office 253 — 1,219 1,472 534,204 535,676 — Total commercial real estate 3,607 133 3,474 7,214 2,880,058 2,887,272 — Consumer Residential 8,967 6,101 7,292 22,360 2,545,935 2,568,295 887 Other 192 37 54 283 89,147 89,430 40 Total consumer 9,159 6,138 7,346 22,643 2,635,082 2,657,725 927 Total $ 37,625 $ 8,713 $ 46,333 $ 92,671 $ 12,890,984 $ 12,983,655 $ 1,120 (1) Nonaccrual Status The following table provides information about nonaccruing loans by portfolio segment and class of financing receivable as of and for the three months ended March 31, 2020. Nonaccrual Loans - Amortized Cost 90+ Days (In thousands) Beginning of the Period (1) End of the Period No Allowance Recorded Past Due and Accruing Interest Income Recognized Commercial and industrial General C&I $ 66,589 $ 62,517 $ 11,580 $ 13 $ — Energy 9,568 19,171 1,137 — 8 Restaurant 53,483 52,603 19,220 24 29 Healthcare 4,833 3,011 1,952 — — Total commercial and industrial 134,473 137,302 33,889 37 37 Commercial real estate Industrial, retail, and other 5,935 6,385 4,301 2 43 Multifamily — — — — — Office 1,245 1,159 1,044 — — Total commercial real estate 7,180 7,544 5,345 2 43 Consumer Residential 15,101 14,799 2,491 1,960 30 Other 24 8 — — 2 Total consumer 15,125 14,807 2,491 1,960 32 Total (2) $ 156,778 $ 159,653 $ 41,725 $ 1,999 $ 112 (1) Amounts are not comparable to prior period public filings due to our adoption of CECL on January 1, 2020. Prior to this date, pools of individual ACI loans were excluded because they continued to earn interest income from the accretable yield at the pool level. With the adoption of CECL, the pools were discontinued, and performance is based on contractual terms for individual loans. Additionally, prior to January 1, 2020, nonaccrual balances were presented using recorded investment. Upon adoption of CECL, approximately $43.0 million of ACI loans were reclassed to nonaccrual loans. (2) $45.3 million and $44.5 million of net accrued interest receivable is excluded from the total nonaccrual loan balances above as of March 31, 2020 and December 31, 2019, respectively. Loans Modified into TDRs The Company attempts to work with borrowers when necessary to extend or modify loan terms to better align with the borrower’s ability to repay. Extensions and modifications to loans are made in accordance with internal policies and guidelines which conform to regulatory guidance. Each occurrence is unique to the borrower and is evaluated separately. The Bank considers regulatory guidelines when restructuring loans to ensure that prudent lending practices are followed. Qualifying criteria and payment terms are structured by the borrower’s current and prospective ability to comply with the modified terms of the loan. A modification is classified as a TDR if the borrower is experiencing financial difficulty and it is determined that the Company has granted a concession to the borrower. The Company may determine that a borrower is experiencing financial difficulty if the borrower is currently in default on any of its debt, or if it is probable that a borrower may default in the foreseeable future without the modification. Concessions could include reductions of interest rates at a rate lower than current market rate for a new loan with similar risk, extension of the maturity date, reduction of accrued interest, principal forgiveness, forbearance, or other concessions. The assessments of whether a borrower is experiencing or will likely experience financial difficulty and whether a concession has been granted is highly subjective in nature, and management’s judgment is required when determining whether a modification is classified as a TDR. All TDRs are individually evaluated to measure the amount of any ACL. The TDR classification may be removed if the borrower demonstrates compliance with the modified terms and the restructuring agreement specifies an interest rate equal to that which would be provided to a borrower with similar credit at the time of restructuring. The following table provides information regarding loans that were modified into TDRs during the periods indicated. For the Three Months Ended March 31, 2020 2019 (Dollars in thousands) Number of TDRs Amortized Cost (1) Number of TDRs Amortized Cost Commercial and industrial 7 $ 65,691 1 $ 24,369 Total 7 $ 65,691 1 $ 24,369 (1) Less than $0.1 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020. The loans that were modified into TDRs during the three months ended March 31, 2020 were primarily general C&I and restaurant loans. The loan that was modified into a TDR during the three months ended March 31, 2019 was a general C&I loan. The Company monitors loan payments on an on-going basis to determine if a loan is considered to have a payment default. Determination of payment default involves analyzing the economic conditions that exist for each customer and their ability to generate positive cash flows during the loan term. Default is defined as the earlier of the troubled debt restructuring being placed on non-accrual status or obtaining 90 days past due status with respect to principal and/or interest payments. For the three-month periods ended March 31, 2020 and March 31, 2019, the Company had no TDRs for which there was a payment default within the 12 months following the restructure date. During the three months ended March 31, 2020, approximately $6.8 million in charge-offs were taken related to one general C&I loan that was modified into a TDR during the same period. Additionally, in March 2020, regulators issued the Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus which allows loan modifications due to the effects of Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus to not be identified as a TDR. For the three-month period ended March 31, 2020, the Company had no loan modifications due to the effects of COVID-2019 but expects additional loans to be restructured due to the effects of COVID-19 in the coming periods that will not be identified as TDRs in accordance with this interagency statement. The following table provides information regarding the types of loan modifications that were modified into TDRs during the periods indicated. For the Three Months Ended March 31, 2020 2019 Number of Loans Modified by: Rate Concession Modified Terms and/or Other Concessions Rate Concession Modified Terms and/or Other Concessions Commercial and industrial 1 6 — 1 Total 1 6 — 1 Residential Mortgage Loans in Process of Foreclosure Included in loans are zero and $4.4 million of consumer loans secured by single family residential real estate that are in process of foreclosure at March 31, 2020 and December 31, 2019, respectively. We have ceased foreclosure activities on residential real estate due to the COVID-19 pandemic. Loans in process of foreclosure include those for which formal foreclosure proceedings are in process according to local requirements of the applicable jurisdiction. In addition to the single family residential real estate loans in process of foreclosure, the Company also held $97 thousand and $151 thousand of foreclosed single-family residential properties in other real estate owned as of March 31, 2020 and December 31, 2019, respectively.

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 The following table summarizes the Company’s goodwill and other intangible assets at March 31, 2020 and December 31, 2019: (In thousands) March 31, 2020 December 31, 2019 Goodwill $ 43,061 $ 485,336 Core deposit intangible, net of accumulated amortization of $65,793 and $60,836, respectively 85,829 90,788 Customer lists, net of accumulated amortization of $22,488 and $21,908, respectively 11,369 11,993 Noncompete agreements, net of accumulated amortization of $172 and $137, respectively 1,184 1,473 Trademarks, net of accumulated amortization of $95 and $75, respectively 1,339 1,359 Total goodwill and intangible assets, net $ 142,782 $ 590,949 In accordance with US GAAP , the Company performs annual tests to identify potential impairment of goodwill. The tests are required to be performed annually and more frequently if events or circumstances indicate a potential impairment may exist. The Company compares the fair value of each reporting unit with its carrying amount, including goodwill. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss is recognized in an amount equal to that excess. Considering the recent economic conditions resulting from the COVID-19 pandemic, the Company conducted an interim goodwill impairment test as of March 31, 2020. The 2020 interim test indicated a goodwill impairment of $443.7 million within the Bank reporting unit resulting in the Company recording an impairment charge of the same amount in the first quarter of 2020. The primary causes of the goodwill impairment in the Bank reporting unit were economic and industry conditions resulting from the COVID-19 pandemic that caused volatility and reductions in the market capitalization of the Company and its peer banks, increased loan provision estimates, increased discount rates and other changes in variables driven by the uncertain macro-environment that resulted in the estimated fair value of the reporting unit being less than the reporting unit’s carrying value. The fair value of the reporting unit was determined using an income approach under the framework established for measuring fair value under ASC 820. The Company has $43.1 million in goodwill remaining in its separate reporting units of Trust, Retail Brokerage and Investment Service businesses for which the Company's qualitative assessments based upon the asset and fee-based nature of the businesses did not indicate potential impairment as of March 31, 2020. The fair values of the reporting units are based upon management’s estimates and assumptions. Although management has used the estimates and assumptions it believes to be most appropriate in the circumstances, it should be noted that even relatively minor changes in certain assumptions used in management’s calculations could result in significant differences in the results of the impairment tests. The following table represents changes to the carrying amount of goodwill by segment for the period reported. (In thousands) Banking Financial Services Corporate Consolidated Balance as of December 31, 2019 $ 442,579 $ 42,757 $ — $ 485,336 Additions: Wealth & Pension acquisition — 304 — 304 Other 1,116 — — 1,116 Losses: Impairment (443,695 ) — — (443,695 ) Balance as of March 31, 2020 $ — $ 43,061 $ — $ 43,061 During the quarter ended March 31, 2020, goodwill assigned to Banking increased by $1.1 million related to the State Bank acquisition. There was an increase of $0.3 million that resulted from the net asset acquisition from Wealth & Pension Services Group, Inc. on July 1, 2019 by the Bank’s subsidiary, Linscomb & Williams, Inc. (see Note 2).

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	Note 6—Derivatives The Company primarily uses derivatives to manage exposure to market risk, including interest rate risk, credit risk and foreign currency risk, and to assist customers with their risk management objectives. Management will designate certain derivatives as hedging instruments in a qualifying hedge accounting relationship. The Company’s remaining derivatives consist of economic hedges that do not qualify for hedge accounting and derivatives held for customer accommodation, or other purposes. The fair value of derivative positions outstanding is included in “other assets” and “other liabilities” on the accompanying consolidated balance sheets and in the net change in each of these financial statement line items in the accompanying consolidated statements of cash flows. For derivatives not designated as hedging instruments, gains and losses due to changes in fair value are included in noninterest income and the operating section of the consolidated statement of cash flows. For derivatives designated as hedging instruments, the entire change in the fair value related to the derivative instrument is recognized as a component of other comprehensive income and subsequently reclassified into interest income when the forecasted transaction affects income. The notional amounts and estimated fair values as of March 31, 2020 and December 31, 2019 were as follows: March 31, 2020 December 31, 2019 Fair Value Fair Value (In thousands) Notional Amount Other Assets Other Liabilities Notional Amount Other Assets Other Liabilities Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ 350,000 $ 23,497 $ — $ 350,000 $ — $ 643 Commercial loan interest rate collars — — — 4,000,000 239,213 — Total derivatives designated as hedging instruments 350,000 23,497 — 4,350,000 239,213 643 Derivatives not designated as hedging instruments: Commercial loan interest rate swaps 1,203,681 24,533 1,956 1,008,805 8,386 899 Commercial loan interest rate caps 171,470 11 11 167,185 18 18 Commercial loan interest rate floors 613,250 15,634 15,634 654,298 8,836 8,836 Commercial loan interest rate collars 73,332 711 711 75,555 257 257 Mortgage loan held-for-sale interest rate lock commitments 21,350 333 — 4,138 22 — Mortgage loan forward sale commitments 2,705 — 23 4,109 26 — Mortgage loan held-for-sale floating commitments 7,732 — — 1,523 — — Foreign exchange contracts 73,937 1,614 1,208 74,322 379 558 Total derivatives not designated as hedging instruments 2,167,457 42,836 19,543 1,989,935 17,924 10,568 Total derivatives $ 2,517,457 $ 66,333 $ 19,543 $ 6,339,935 $ 257,137 $ 11,211 The Company is party to collateral support agreements with certain derivative counterparties. Such agreements require that the Company or the counterparty to maintain collateral based on the fair values of derivative transactions. In the event of default by a counterparty the non-defaulting counterparty would be entitled to the collateral. At March 31, 2020 and December 31, 2019, the Company was required to post $13.2 million and $10.6 million, respectively, in cash or securities as collateral for its derivative transactions, which are included in “interest-bearing deposits with banks” on the Company’s consolidated balance sheets. In addition, the Company had recorded the obligation to return cash collateral provided by a counterparty of $19.1 million as of March 31, 2020 within deposits on the Company’s consolidated balance sheet. The Company’s master agreements represent written, legally enforceable bilateral agreements that (1) create a single legal obligation for all individual transactions covered by the master agreement and (2) in the event of default, provide the non-defaulting counterparty the right to accelerate, terminate, and close-out on a net basis all transactions under the agreement and to promptly liquidate or set-off collateral posted by the defaulting counterparty. As permitted by U.S. GAAP, the Company does not offset fair value amounts for the right to reclaim cash collateral or the obligation to return cash collateral against fair value amounts of derivatives executed with the same counterparty under the master agreement. Pre-tax For the Three Months Ended March 31, 2020 2019 (In thousands) OCI Reclassified from AOCI to interest income Noninterest income OCI Reclassified from AOCI to interest income Noninterest income Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ 24,035 $ (106 ) $ — $ 6,656 $ (1,508 ) $ — Commercial loan interest rate collars 143,198 8,213 — 41,477 — — Derivatives not designated as hedging instruments: Mortgage loans held for sale interest rate lock commitments $ — $ — $ 311 $ — $ — $ 69 Foreign exchange contracts 865 — — 1,140 Cash Flow Hedges Cash flow hedge relationships mitigate exposure to the variability of future cash flows or other forecasted transactions. The Company uses interest rate swaps, caps, floors and collars to manage overall cash flow changes related to interest rate risk exposure on benchmark interest rate loans (1-Month LIBOR). In February 2019, the Company entered into a $4.0 billion notional interest rate collar with a five-year In March 2016, the Company entered into the following interest rate swap agreements to manage overall cash flow changes related to interest rate risk exposure on benchmark interest rate loans. Effective Date Maturity Date Notional Amount (In Thousands) Fixed Rate Variable Rate March 8, 2016 February 27, 2026 $ 175,000 1.5995 % 1 Month LIBOR March 8, 2016 February 27, 2026 175,000 1.5890 1 Month LIBOR Based on our current interest rate forecast, $76.1 million of deferred income on derivatives in OCI at March 31, 2020 is estimated to be reclassified into net interest income during the next twelve months. Future changes to interest rates or the amount of outstanding hedged loans may significantly change actual amounts reclassified to income. There were no reclassifications into income during the three months ended March 31, 2020 and 2019 as a result of any discontinuance of cash flow hedges because the forecasted transaction is no longer probable. The maximum length of time over which the Company is hedging a portion of its exposure to the variability in future cash flows for forecasted transactions is approximately 5.9 years as of March 31, 2020. Interest Rate Swap, Floor, Cap and Collar Agreements not designated as hedging derivatives The Company enters into certain interest rate swap, floor, cap and collar agreements on commercial loans that are not designated as hedging instruments. These derivative contracts relate to transactions in which the Company enters into an interest rate swap, floor, cap or collar with a loan customer while at the same time entering into an offsetting interest rate agreement with another financial institution. In connection with each swap transaction, the Company agrees to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The interest rate swap transaction allows the Company’s customer to effectively convert a variable rate loan to a fixed rate. The interest rate cap transaction allows the Company’s customer to minimize interest rate risk exposure to rising interest rates. Because the Company acts as an intermediary for its customer, changes in the fair value of the underlying derivative contracts for the most part offset each other and do not significantly impact the Company’s consolidated statements of income. The Company is exposed to credit loss in the event of nonperformance by the parties to the interest rate agreements. However, the Company does not anticipate nonperformance by the counterparties. The estimated fair value has been recorded as an asset and a corresponding liability in the accompanying consolidated balance sheets as of March 31, 2020 and December 31, 2019.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2020
Banking And Thrift [Abstract]
Deposits	Note 7—Deposits Domestic time deposits $250,000 and over were $607.1 million and $644.1 million at March 31, 2020 and December 31, 2019, respectively. There were no foreign time deposits at either March 31, 2020 or December 31, 2019.

Borrowed Funds

Borrowed Funds	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Borrowed Funds	Note 8—Borrowed Funds Senior and Subordinated Debt In June 2019, the Company completed a registered public offering of $85 million aggregate principal amount of 4.75% fixed to floating rate subordinated notes due 2029, the net proceeds of which were used to redeem our 4.875% senior notes due June 28, 2019. In June 2014, the Company and the Bank completed an unregistered $245 million multi-tranche debt transaction and in March 2015, the Company completed an unregistered $50 million debt transaction. These transactions enhanced our liquidity and regulatory capital levels to support balance sheet growth. Details of the debt transactions are as follows: (In thousands) March 31, 2020 December 31, 2019 Cadence Bancorporation: 5.375% senior notes, due June 28, 2021 $ 50,000 $ 50,000 7.250% subordinated notes, due June 28, 2029, callable in 2024 35,000 35,000 6.500% subordinated notes, due March 2025 40,000 40,000 4.750% subordinated notes, due June 2029 85,000 85,000 Total — Cadence Bancorporation 210,000 210,000 Cadence Bank: 6.250% subordinated notes, due June 28, 2029, callable in 2024 25,000 25,000 Debt issue costs and unamortized premium (2,013 ) (2,350 ) Total senior and subordinated debt $ 232,987 $ 232,650 The senior transactions were structured with four- and seven-year fifteen-year ten-year ten-year five-year five-year The Company’s outstanding senior note is unsecured, unsubordinated obligations and is equal in right of payment to all the Company’s other unsecured debt. The Company’s subordinated notes are unsecured obligations and will be subordinated in right of payment to all the Company’s senior indebtedness and general creditors and to depositors at the Bank. The Company’s senior notes and subordinated notes are not guaranteed by any subsidiary of the Company, including the Bank. The Bank’s subordinated notes are unsecured obligations and are subordinated in right of payment to all the Bank’s senior indebtedness and general creditors and to depositors of the Bank. The Bank’s subordinated notes are not guaranteed by the Company or any subsidiary of the Bank. Payment of principal on the Company’s and Bank’s subordinated notes may be accelerated by holders of such subordinated notes only in the case of certain insolvency events. There is no right of acceleration under the subordinated notes in the case of default. The Company and/or the Bank may be required to obtain the prior written approval of the Federal Reserve, and, in the case of the Bank, the OCC, before it may repay the subordinated notes issued thereby upon acceleration or otherwise. Junior Subordinated Debentures In conjunction with the Company’s acquisition of Cadence Financial Corporation and Encore Bank, N.A., the junior subordinated debentures were marked to fair value as of their respective acquisition dates. The related mark is being amortized over the remaining term of the junior subordinated debentures. The following is a list of junior subordinated debt: (In thousands) March 31, 2020 December 31, 2019 Junior subordinated debentures, 3 month LIBOR plus 2.85%, due 2033 $ 30,000 $ 30,000 Junior subordinated debentures, 3 month LIBOR plus 2.95%, due 2033 5,155 5,155 Junior subordinated debentures, 3 month LIBOR plus 1.75%, due 2037 15,464 15,464 Total par value 50,619 50,619 Purchase accounting adjustment, net of amortization (13,268 ) (13,174 ) Total junior subordinated debentures $ 37,351 $ 37,445 Advances from FHLB and Borrowings from FRB Outstanding FHLB advances were $ 100 millio n as of March 31, 2020 and December 31, 2019 . At March 31, 2020 , the outstanding advance was a long-term convertible advance. A dvances are collateralized by $ 1.9 billion o f commercial and residential real estate loans pledged under a blanket lien arrangement as of March 31, 2020 , which provides $ billion of borrowing availability. As of March 31, 2020 and December 31, 2019, the FHLB has issued for the benefit of the Bank irrevocable letters of credit totaling $566 million and $391 million, respectively. Included in the FHLB letters of credit is a $60 million irrevocable letter of credit in favor of a municipal customer to secure certain deposits. This letter of credit expires June 2, 2020. The Bank also has a $500 million variable letter of credit to secure a large public fund treasury management deposit. This letter of credit will expire April 16, 2020 upon 45 days’ prior notice of non-renewal; otherwise it automatically extends for a successive one-year There were no borrowings from the FRB discount window as of March 31, 2020 and December 31, 2019. Any borrowings from the FRB would be collateralized by $805.7 million in commercial loans pledged under a borrower-in-custody arrangement. Notes Payable On July 1, 2019, the Company’s wholly owned subsidiary, Linscomb & Williams, Inc., acquired certain assets and assumed certain liabilities of Wealth and Pension Services Group, Inc. (“W&P”). At March 31, 2020, a note payable of $2.1 million was outstanding in connection with this acquisition (see Note 2). On March 29, 2019, the Company entered into a credit agreement for a revolving loan facility in the amount of $100 million with a maturity date of March 29, 2020. On March 29, 2020, the Company renewed the credit agreement with a maturity date of March 29, 2021. There were no amounts outstanding under this line of credit at March 31, 2020. Any proceeds of the revolving loan will be used to finance general corporate purposes. Although the credit facility is unsecured, we agreed not to sell, pledge, or transfer any part of our right, title, or interest in our subsidiary bank while the agreement is in place.

Other Noninterest Income and Ot

Other Noninterest Income and Other Noninterest Expense	3 Months Ended
	Mar. 31, 2020
Other Nonoperating Income Expense [Abstract]
Other Noninterest Income and Other Noninterest Expense	Note 9—Other Noninterest Income and Other Noninterest Expense The detail of other noninterest income and other noninterest expense captions presented in the consolidated statements of operations is as follows: Three Months Ended March 31, (In thousands) 2020 2019 Other noninterest income Insurance revenue $ 249 $ 198 Mortgage banking income 1,111 579 Income from bank owned life insurance policies 1,328 1,152 Other (577 ) 1,585 Total other noninterest income $ 2,111 $ 3,514 Three Months Ended March 31, (In thousands) 2020 2019 Other noninterest expenses Data processing expense $ 3,352 $ 2,594 Software amortization 3,547 3,335 Consulting and professional fees 2,707 2,229 Loan related expenses 760 910 FDIC insurance 2,436 1,752 Communications 1,156 998 Advertising and public relations 1,464 781 Legal expenses 411 158 Other 11,636 8,181 Total other noninterest expenses $ 27,469 $ 20,938

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Note 10—Income Taxes Income tax (benefit) expense for the three months ended March 31, 2020 was ($33.2) million compared to $17.1 million The effective tax rate is primarily affected by the amount of pre-tax income, and to a lesser extent, tax-exempt interest income, and the increase in cash surrender value of bank-owned life insurance. The effective tax rate is also affected by discrete items that may occur in any given period but are not consistent from period-to-period, which may impact the comparability of the effective tax rate between periods. At March 31, 2020, we had a net deferred tax asset of $40.3 million, compared to a net deferred tax liability of

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Common Share	Note 11—Earnings Per Common Share The following table displays a reconciliation of the information used in calculating basic and diluted net (loss) income per common share for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, (In thousands, except share and per share data) 2020 2019 Net (loss) income per consolidated statements of operations $ (399,311 ) $ 58,201 Net income allocated to participating securities — (173 ) Net (loss) income allocated to common stock $ (399,311 ) $ 58,028 Weighted average common shares outstanding (Basic) 126,630,446 130,485,521 Weighted average dilutive restricted stock units and warrants — 63,798 Weighted average common shares outstanding (Diluted) 126,630,446 130,549,319 (Loss) earnings per common share (Basic) $ (3.15 ) $ 0.44 (Loss) earnings per common share (Diluted) $ (3.15 ) $ 0.44 T he effect from the assumed exercise of 2,512,524 and 1,848,496 stock options and restricted stock units for the three months ended March 31, 2020 and 2019, respectively, were not included in the above computations of diluted earnings per share because such amounts would have had an antidilutive effect on earnings per common share.

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2020
Banking And Thrift [Abstract]
Regulatory Matters	Note 12—Regulatory Matters Cadence and Cadence Bank are each required to comply with regulatory capital requirements established by federal and state banking agencies. Failure to meet minimum capital requirements can subject the Company and the Bank to certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. These regulatory capital requirements involve quantitative measures of the Company’s assets, liabilities and certain off-balance sheet items, and qualitative judgments by the regulators. Quantitative measures established by regulation to ensure capital adequacy require institutions to maintain minimum ratios of common equity Tier 1, Tier 1, and total capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital to average tangible assets (the “Leverage” ratio). On March 27, 2020, the federal banking agencies issued an interim final rule to delay the estimated impact on regulatory capital stemming from the adoption of CECL. The agencies granted this relief to allow institutions to focus on lending to customers in light of recent strains on the U.S economy due to COVID-19, while also maintaining the quality of regulatory capital. Under the interim final rule, 100% of the CECL Day 1 impact and 25% of subsequent provisions for credit losses (“Day 2” impacts) will be deferred over a two-year year period ending January 1, 2022, at which time it this deferred amount will be phased in on a pro rata basis over a three-year period ending January 2025. The actual capital amounts and ratios for the Company and the Bank as of March 31, 2020 and December 31, 2019 are presented in the following tables and as shown, are above the thresholds necessary to be considered “well-capitalized.” Management believes that no events or changes have occurred after March 31, 2020 that would change this designation. Consolidated Company Bank (In thousands) Amount Ratio Amount Ratio March 31, 2020 Tier 1 leverage $ 1,777,399 10.1 % $ 1,875,239 10.6 % Common equity tier 1 capital 1,777,399 11.4 1,825,239 11.8 Tier 1 risk-based capital 1,777,399 11.4 1,875,239 12.1 Total risk-based capital 2,143,332 13.8 2,050,683 13.2 Minimum requirement: Tier 1 leverage 704,395 4.0 704,633 4.0 Common equity tier 1 capital 698,790 4.5 698,584 4.5 Tier 1 risk-based capital 931,720 6.0 931,445 6.0 Total risk-based capital 1,242,293 8.0 1,241,927 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A 880,791 5.0 Common equity tier 1 capital N/A N/A 1,009,066 6.5 Tier 1 risk-based capital 931,720 6.0 1,241,927 8.0 Total risk-based capital 1,552,866 10.0 1,552,409 10.0 Consolidated Company Bank (In thousands) Amount Ratio Amount Ratio December 31, 2019 Tier 1 leverage $ 1,784,664 10.3 % $ 1,953,008 11.1 % Common equity tier 1 capital 1,784,664 11.5 1,903,008 12.3 Tier 1 risk-based capital 1,784,664 11.5 1,953,008 12.6 Total risk-based capital 2,120,571 13.7 2,099,146 13.6 Minimum requirement: Tier 1 leverage 690,213 4.0 689,881 4.0 Common equity tier 1 capital 697,089 4.5 696,755 4.5 Tier 1 risk-based capital 929,453 6.0 929,007 6.0 Total risk-based capital 1,239,270 8.0 1,238,676 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A 862,351 5.0 Common equity tier 1 capital N/A N/A 1,006,425 6.5 Tier 1 risk-based capital 929,453 6.0 1,238,676 8.0 Total risk-based capital 1,549,088 10.0 1,548,345 10.0 Under regulations controlling national banks, the payment of any dividends by a bank without prior approval of the OCC is limited to the current year’s net profits (as defined by the OCC) and retained net profits of the two preceding years. Due to the effect of the recognition of the non-cash goodwill impairment charge in the first quarter of 2020 to the Banks retained profits, the Bank is currently required to seek prior approval of the OCC to pay a dividend. The Federal Reserve, as primary regulator for bank holding companies, has also stated that all common stock dividends should be paid out of current income. While the holding company had $137.3 million in cash on hand as of March 31, 2020, the holding company does not generate income on a stand-alone basis, and, over time, may not have the capability to pay common stock dividends without first receiving dividends from the Bank. The Bank is required to maintain average reserve balances in the form of cash or deposits with the Federal Reserve Bank. The reserve balance varies depending upon the types and amounts of deposits. At March 31, 2020 the required reserve balance with the Federal Reserve Bank was zero. The Federal Reserve Board has reduced reserve requirement ratios to zero percent that was effective March 26, 2020, the beginning of the next reserve maintenance period. This action eliminated the reserve requirements for many depository institutions and was designed to help support lending. At December 31, 2019, the required reserve balance with the Federal Reserve Bank was approximately

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 13—Commitments and Contingent Liabilities The consolidated financial statements do not reflect various commitments and contingent liabilities which arise in the normal course of banking business and which involve elements of credit risk, interest rate risk, and liquidity risk. The commitments and contingent liabilities are commitments to extend credit, home equity lines, overdraft protection lines, and standby and commercial letters of credit. Such financial instruments are recorded when they are funded. A summary of commitments and contingent liabilities is as follows: (In thousands) March 31, 2020 December 31, 2019 Commitments to extend credit $ 3,985,508 $ 4,667,360 Commitments to grant loans 44,712 292,199 Standby letters of credit 216,267 213,548 Performance letters of credit 23,565 27,985 Commercial letters of credit 20,126 15,587 Commitments to extend credit and letters of credit include some exposure to credit loss in the event of nonperformance of the customer. 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. In addition, the Company has entered certain contingent commitments to grant loans. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. The credit policies and procedures for such commitments are the same as those used for lending activities. Because these instruments have fixed maturity dates and because a number expire without being drawn upon, they generally do not present any significant liquidity risk. No significant losses on commitments were incurred during the three months ended March 31, 2020 and 2019. The Company makes investments in limited partnerships, including certain low-income housing partnerships for which tax credits are received. As of March 31, 2020 and December 31, 2019, The Company and the Bank are defendants in various pending and threatened legal actions arising in the normal course of business. In the opinion of management, based upon the advice of legal counsel, the ultimate disposition of all pending and threatened legal action will not have a material effect on the Company’s consolidated financial statements. On September 16, 2019, a Company shareholder filed a putative class action complaint against Cadence Bancorporation and certain senior officers. Following consolidation of a related matter and appointment of lead plaintiffs, the lead plaintiffs filed an amended complaint on January 31, 2020, which asserted claims under Sections 10(b) and 20 of the Securities Exchange Act on behalf of a putative class of persons and entities that purchased or otherwise acquired the Company’s securities between July 23, 2018 and January 23, 2020, inclusive. The amended complaint alleges that the Company and the individual defendants made materially misleading statements about the credit quality of the Company’s loan portfolio, did not timely charge off bad debt or record sufficient loss provisions to reserve against the risk of loss, and maintained an inadequate allowance for credit losses. The consolidated case is captioned Frank Miller et al. v. Cadence Bancorporation et al.

Disclosure About Fair Values of

Disclosure About Fair Values of Financial Instruments	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Disclosure About Fair Values of Financial Instruments	Note 14—Disclosure About Fair Values of Financial Instruments See Note 20 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2019 for a description of valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis. Assets and Liabilities Recorded at Fair Value on a Recurring Basis The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis categorized by the level of inputs used in the valuation of each asset at March 31, 2020 and December 31, 2019: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2020 Assets Investment securities available-for-sale $ 2,461,644 $ — $ 2,461,644 $ — Equity securities with readily determinable fair values not held for trading 1,529 1,529 — — Derivative assets 66,333 — 66,333 — Other assets 27,798 — — 27,798 Total recurring basis measured assets $ 2,557,304 $ 1,529 $ 2,527,977 $ 27,798 Liabilities Derivative liabilities $ 19,543 $ — $ 19,543 $ — Total recurring basis measured liabilities $ 19,543 $ — $ 19,543 $ — (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2019 Assets Investment securities available-for-sale $ 2,368,592 $ — $ 2,368,592 $ — Equity securities with readily determinable fair values not held for trading 1,862 1,862 — — Derivative assets 257,137 — 257,137 — Other assets 26,882 — — 26,882 Total recurring basis measured assets $ 2,654,473 $ 1,862 $ 2,625,729 $ 26,882 Liabilities Derivative liabilities $ 11,211 $ — $ 11,211 $ — Total recurring basis measured liabilities $ 11,211 $ — $ 11,211 $ — Changes in Level 3 Fair Value Measurements The tables below include a roll-forward of the consolidated balance sheet amounts for the three months ended March 31, 2020 and 2019 for changes in the fair value of financial instruments within Level 3 of the valuation hierarchy that are recorded on a recurring basis. Level 3 financial instruments typically include unobservable components but may also include some observable components that may be validated to external sources. The gains or (losses) in the following table (which are reported in other noninterest income in the consolidated income statements) may include changes to fair value due in part to observable factors that may be part of the valuation methodology. Level 3 Assets Measured at Fair Value on a Recurring Basis For the Three Months Ended March 31, 2020 2019 2020 2019 2020 2019 (In thousands) Net Profits Interests Investments in Limited Partnerships SBA Servicing Rights Beginning Balance $ 4,330 $ 5,779 $ 18,742 $ 11,191 $ 3,811 $ — Acquired — — — — — 6,213 Originations — — — — 299 320 Sales proceeds — — — — — — Net gains (losses) included in earnings (259 ) (174 ) (316 ) 746 (168 ) (2,730 ) Reclassifications — — 525 (800 ) — — Contributions paid — — 1,283 608 — — Distributions received — (288 ) (449 ) (144 ) — — Ending Balance $ 4,071 $ 5,317 $ 19,785 $ 11,601 $ 3,942 $ 3,803 Net unrealized (losses) gains included in earnings relating to assets held at the end of the period $ (259 ) $ (174 ) $ (316 ) $ 746 $ (168 ) $ (2,730 ) Net unrealized gains (losses) recognized in other comprehensive income relating to assets held at the end of the period $ — $ — $ — $ — $ — $ — Assets Recorded at Fair Value on a Nonrecurring Basis From time to time, the Company may be required to measure certain other financial assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower of cost or fair value accounting or write-downs of individual assets. For assets measured at fair value on a nonrecurring basis which were still held on the balance sheets at March 31, 2020 and December 31, 2019, the following tables provide the level of valuation assumptions used to determine each adjustment and the related carrying value: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2020 Loans held for sale $ 38,221 $ — $ 38,221 $ — Individually evaluated loans, net of allocated allowance for credit losses (1) 128,519 — — 128,519 Other real estate and repossessed assets 11,608 — — 11,608 Total assets measured on a nonrecurring basis $ 178,348 $ — $ 38,221 $ 140,127 (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2019 Loans held for sale $ 87,649 $ — $ 87,649 $ — Individually evaluated loans, net of allocated allowance for credit losses (1) 101,561 — — 101,561 Other real estate 1,628 — — 1,628 Total assets measured on a nonrecurring basis $ 190,838 $ — $ 87,649 $ 103,189 (1) Prior to the adoption of CECL on January 1, 2020, these loans were known as Impaired loans, net of specific allowance. Significant unobservable inputs used in Level 3 fair value measurements for financial assets measured at fair value on a nonrecurring basis are summarized below: Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range Weighted Average (2) March 31, 2020 Individually evaluated loans, net of allowance for credit losses (3) $ 128,519 Appraised value, as adjusted Discount to fair value 0% - 50% 38% Discounted cash flow Discount rate 3.75%-5.8% 4.7% Enterprise value Comparables and average multiplier 5.0-6.6 X 5.33 X Enterprise value Discount rates and comparables 6.4%-16.0% 12% Net recoverable oil and gas reserves and forward-looking commodity prices Capitalization rate and discount rate 18% 18% Other real estate 1,008 Appraised value, as adjusted Discount to fair value 0% - 20% 10% Estimated closing costs 10% 10% Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range December 31, 2019 Individually evaluated loans, net of allowance for credit losses (3) $ 101,561 Appraised value, as adjusted Discount to fair value 0% - 50% Appraised value, as adjusted Minimum guaranteed proceeds per Settlement Agreement 0% (1) Discounted cash flow Discount rate 5.8% 0% (1) Enterprise value Exit and earnings multiples, discounted cash flows, and market comparables 0% - 46% (1) Other real estate 1,628 Appraised value, as adjusted Discount to fair value 0% - 20% Estimated closing costs 10% (1) Represents difference of remaining balance to fair value. (2) Weighted averages were calculated using the input attribute and the outstanding balance of the loan. (3) Prior to the adoption of CECL on January 1, 2020, these loans were known as Impaired loans, net of specific allowance. The estimated fair values of the Company’s financial instruments are as follows: March 31, 2020 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 212,658 $ 212,658 $ 212,658 $ — $ — Interest-bearing deposits in other banks 391,362 391,362 391,362 — — Federal funds sold 5,331 5,331 5,331 — — Investment securities available-for-sale 2,461,644 2,461,644 — 2,461,644 — Equity securities with readily determinable fair values not held for trading 1,529 1,529 1,529 — — Loans held for sale 38,221 38,221 — 38,221 — Net loans 13,146,945 13,030,957 — — 13,030,957 Derivative assets 66,333 66,333 — 66,333 — Other assets 83,225 83,225 — — 83,225 Financial Liabilities: Deposits 14,489,505 14,499,103 — 14,499,103 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,955 51,313 — 51,313 — Subordinated debt 183,032 187,781 — 187,781 — Junior subordinated debentures 37,351 45,728 — 45,728 — Notes payable 2,102 2,102 — 2,102 — Derivative liabilities 19,543 19,543 — 19,543 — December 31, 2019 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 252,447 $ 252,447 $ 252,447 $ — $ — Interest-bearing deposits in other banks 725,343 725,343 725,343 — — Federal funds sold 10,974 10,974 10,974 — — Investment securities available-for-sale 2,368,592 2,368,592 — 2,368,592 — Equity securities with readily determinable fair values not held for trading 1,862 1,862 1,862 — — Loans held for sale 87,649 87,649 — 87,649 — Net loans 12,864,012 12,755,360 — — 12,755,360 Derivative assets 257,137 257,137 — 257,137 — Other assets 72,719 72,719 — — 72,719 Financial Liabilities: Deposits 14,742,794 14,753,192 — 14,753,192 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,938 51,202 — 51,202 — Subordinated debt 182,712 189,386 — 189,386 — Junior subordinated debentures 37,445 48,012 — 48,012 — Notes payable 2,078 2,078 — 2,078 — Derivative liabilities 11,211 11,211 — 11,211 —

Variable Interest Entities and

Variable Interest Entities and Other Investments	3 Months Ended
	Mar. 31, 2020
Variable Interest Entities And Other Investments [Abstract]
Variable Interest Entities and Other Investments	Note 15—Variable Interest Entities and Other Investments Under ASC 810-10-65, the Company is deemed to be the primary beneficiary and required to consolidate a variable interest entity (“VIE”) if it has a variable interest in the VIE that provides it with a controlling financial interest. For such purposes, the determination of whether a controlling financial interest exists is based on whether a single party has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the obligation to absorb the losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. ASC 810-10-65, as amended, requires continual reconsideration of conclusions reached regarding which interest holder is a VIE’s primary beneficiary. The Bank has invested in several affordable housing projects as a limited partner. The partnerships have qualified to receive annual affordable housing federal tax credits that are recognized as a reduction of current tax expense. The Company has determined that these structures meet the definition of VIE’s under ASC 810 but that consolidation is not required, as the Bank is not the primary beneficiary. At March 31, 2020 and December 31, 2019, the Bank’s maximum exposure to loss associated with these limited partnerships was limited to the Bank’s investment. The Company accounts for these investments and the related tax credits using either the effective yield method or the proportional amortization method, depending upon the date of the investment. Under the effective yield method, the Bank recognizes the tax credits as they are allocated and amortizes the initial costs of the investments to provide a constant effective yield over the period that the tax credits are allocated. Under the proportional amortization method, the Bank amortizes the cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense. At March 31, 2020 and December 31, 2019, the Company had recorded investments in other assets on its consolidated balance sheets of approximately $27.6 million and $28.2 million, respectively related to these investments. Additionally, the Company invests in other certain limited partnerships accounted for under the fair value practical expedient of net asset value totaling $19.8 million and $18.7 million as of March 31, 2020 and December 31, 2019, respectively. The company recognized $0.3 million in losses The following table presents a summary of the Company’s investments in limited partnerships as of March 31, 2020 and December 31, 2019: (In thousands) March 31, 2020 December 31, 2019 Affordable housing projects (amortized cost) $ 27,635 $ 28,205 Limited partnerships accounted for under the fair value practical expedient of NAV 19,785 18,742 Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method 12,498 8,681 Limited partnerships required to be accounted for under the equity method 8,951 8,951 Total investments in limited partnerships $ 68,869 $ 64,579 Equity investments with readily determinable fair values not held for trading are recorded at fair value with changes in fair value reported in net income. Cadence elected a measurement alternative to fair value for certain equity investments without a readily determinable fair value. As of March 31, 2020, and December 31, 2019, there were no downward and upward adjustments for impairments or price changes from observable transactions. The carrying amount of equity investments measured under the measurement alternative are as follows: For the Three Months Ended March 31, (In thousands) 2020 2019 Carrying value, Beginning of Year $ 8,681 $ 8,714 Reclassifications (525 ) 800 Distributions (215 ) (42 ) Contributions 300 736 Acquired in Settlement of Loans 4,257 — Carrying value, End of Period $ 12,498 $ 10,208 Cadence’s investments in certain markable equity securities are carried at fair value and are reported in other assets in the consolidated balance sheets. Total marketable equity securities were $1.5 million and $1.9 million at March 31, 2020 and December 31, 2019, respectively. During 2016, the Bank received net profits interests in oil and gas reserves, in connection with the reorganization under bankruptcy of two loan customers (one of these was sold during 2018). The Company has determined that these contracts meet the definition of VIE’s under Topic ASC 810, but that consolidation is not required as the Bank is not the primary beneficiary. The net profits interest is a financial instrument and recorded at estimated fair value, which was $4.1 million and $4.3 million at March 31, 2020 and December 31, 2019, respectively, representing the maximum exposure to loss as of that date. The Company has established a rabbi trust related to the deferred compensation plan offered to certain of its employees. The Company contributes employee cash compensation deferrals to the trust. The assets of the trust are available to creditors of the Company only in the event the Company becomes insolvent. This trust is considered a VIE because either there is no equity at risk in the trust or because the Company provided the equity interest to its employees in exchange for services rendered. The Company is considered the primary beneficiary of the rabbi trust as it has the ability to select the underlying investments made by the trust, the activities that most significantly impact the economic performance of the rabbi trust. The Company includes the assets of the rabbi trust as a component of other assets and a corresponding liability for the associated benefit obligation in other liabilities in its consolidated balance sheets. At March 31, 2020 and December 31, 2019, the amount of rabbi trust assets and benefit obligation was $3.3 million and $3.7 million, respectively.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Segment Reporting	Note 16—Segment Reporting The Company determines reportable segments based on the services offered, the significance of the services offered, the significance of those services to the Company’s financial condition and operating results and management’s regular review of the operating results of those services. The Company operates through three operating segments: Banking, Financial Services and Corporate. Additional information about the Company’s reportable segments is included in Cadence’s Annual Report on Form 10-K for the year ended December 31, 2019. The Banking Segment includes the Commercial Banking, Retail Banking and Private Banking lines of business. The Financial Services Segment includes the Trust, Retail Brokerage, and Investment Services businesses. Business segment results are determined based upon the management reporting system, which assigns balance sheet and income statement items to each of the business segments. The process is designed around the organizational and management structure and, accordingly, the results derived are not necessarily comparable with similar information published by other financial institutions or in accordance with generally accepted accounting principles. The Company evaluates performance and allocates resources based on profit or loss from operations. There are no material inter-segment sales or transfers. The Company recognized a $443.7 non-cash goodwill impairment charge as March 31, 2020 representing all of the goodwill allocated to the Banking segment (Note 5). The accounting policies used by each reportable segment are the same as those discussed in Note 1 of the Annual Report on Form 10-K for the year ended December 31, 2019. All costs, except corporate administration and income taxes, have been allocated to the reportable segments. Therefore, combined amounts agree to the consolidated totals. The following tables present the operating results of the segments as of and for the three months ended March 31, 2020 and 2019: Three Months Ended March 31, 2020 (In thousands) Banking Financial Services Corporate Consolidated Net interest income (expense) $ 157,557 $ (352 ) $ (3,737 ) $ 153,468 Provision for credit losses 83,429 — — 83,429 Noninterest income 25,343 10,208 (482 ) 35,069 Noninterest expense 528,066 8,710 877 537,653 Income tax (benefit) expense (30,922 ) 95 (2,407 ) (33,234 ) Net (loss) income $ (397,673 ) $ 1,051 $ (2,689 ) $ (399,311 ) Total assets $ 17,142,981 $ 90,600 $ 4,337 $ 17,237,918 Three Months Ended March 31, 2019 (In thousands) Banking Financial Services Corporate Consolidated Net interest income (expense) $ 174,396 $ (630 ) $ (4,477 ) $ 169,289 Provision for credit losses 11,210 — — 11,210 Noninterest income 20,087 10,285 292 30,664 Noninterest expense 97,324 7,652 8,464 113,440 Income tax expense (benefit) 19,862 373 (3,133 ) 17,102 Net income (loss) $ 66,087 $ 1,630 $ (9,516 ) $ 58,201 Total assets $ 17,347,134 $ 100,175 $ 5,602 $ 17,452,911

Equity-based Compensation

Equity-based Compensation	3 Months Ended
	Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-based Compensation	Note 17—Equity-based Compensation The Company administers a long-term incentive compensation plan that permits the granting of incentive awards in the form of stock options, restricted stock, restricted stock units, performance units, stock appreciation rights, or other stock-based awards. The terms of all awards issued under these plans are determined by the Compensation Committee of the Board of Directors. The Amended and Restated 2015 Omnibus Incentive Plan (the “Plan”) permits the Company to grant to employees and directors various forms of incentive compensation. The principal purposes of this plan are to focus directors, officers, and other employees and consultants on business performance that creates shareholder value, to encourage innovative approaches to the business of the Company, and to encourage ownership of the Company’s stock. The Plan authorizes 7.5 million common share equivalents available for grant, where grants of full value awards (e.g., shares of restricted stock, restricted stock units and performance stock units) count as one share equivalent. The number of remaining share equivalents available for future issuance under the Plan was 4.2 million at March 31, 2020. Restricted Stock Units During the three months ended March 31, 2020 and 2019, the Company granted zero and 645,346 shares, respectively, of stock-based awards in the form of restricted stock units pursuant to and subject to the provisions of the Plan. The following table summarizes the activity related to restricted stock unit awards: For the Three Months Ended March 31, 2020 2019 Number of Shares Weighted Average Fair Value per Unit at Award Date Number of Shares Weighted Average Fair Value per Unit at Award Date Non-vested at beginning of period 1,229,863 $ 19.97 273,354 $ 26.49 Granted during the period — — 645,346 17.87 Vested during the period (160,668 ) 20.55 (44,501 ) 26.50 Forfeited during the period (56,429 ) 20.20 (29,845 ) 19.76 Non-vested at end of period 1,012,766 $ 19.86 844,354 $ 20.14 The restricted stock units granted include both time and performance-based components. Of the time-based restricted stock units granted and remaining at March 31, 2020: • 41,843 • 2,116 • 277,302 • 29,181 • 48,562 • 177,236 • 1,000 • 6,998 • 9,901 While the grants specify a stated target number of units, the determination of the actual settlement in shares will be based in part on the achievement of certain financial performance measures of the Company. For the performance-based restricted stock units granted, these performance conditions will determine the actual units vesting and can be in the range of 25% to 200% of the units granted. These grants include rights as a shareholder in the form of dividend equivalents. Dividend equivalents for time vested restricted stock units will be paid on each dividend payment date for the Company; dividend equivalents for the performance vesting restricted stock will be accrued and paid on the vested number of shares once the performance is achieved and the shares are issued. The fair value of the restricted stock units was estimated based upon the fair value of the underlying shares on the date of the grant. The Company recorded $1.1 million of equity-based compensation expense for the outstanding restricted stock units for the three months ended March 31, 2020, compared to $0.9 million for the three months ended March 31, 2019. The remaining expense related to unvested restricted stock units is $15.4 million as of March 31, 2020 and will be recognized over service periods ranging from 12 months to 42 months. Stock Options During the three months ended March 31, 2020 and 2019, the Company granted zero and 1,602,848 stock options, respectively, to certain executive officers. The options were granted at an exercise price equal to a 15% premium to the fair value of the common stock at the date of grant with a weighted-average exercise price of $20.43. The options vest over a three-year The Company used the Black-Scholes option pricing model to estimate the fair value of the stock options. See Note 23 to the consolidated financial statements of our Annual Report on Form 10-K for the year ended December 31, 2019 for a description of the assumptions used for stock option awards issued during 2019. Employee Stock Purchase Plan On June 1, 2018, the Company commenced the 2018 Employee Stock Purchase Plan (“ESPP”) whereby employees may purchase the Company’s Class A common stock at a discount of 15% of the fair market value of a share of Class A common stock, defined as the closing price of Class A common stock on the NYSE for the first and last days of the purchase period (as defined in the ESPP). The total amount of the Company’s Class A common stock on which options may be granted under the ESPP shall not exceed 500,000 shares. Shares of Class A common stock subject to any unexercised portion of a terminated, canceled or expired option granted under the ESPP may again be used for options under the ESPP. No participating employee shall have any rights as a shareholder until the issuance of a stock certificate to the employee. There were 67,844 shares and 25,519 shares of Class A common stock purchased in the open market by the ESPP during the three months ended March 31, 2020 and 2019, respectively, which resulted in compensation expense of $14 thousand and $92 thousand for the three months ended March 31, 2020 and 2019, respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Note 18—Accumulated Other Comprehensive Income (Loss) Activity within the balances in accumulated other comprehensive income (loss) is shown in the following tables for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, 2020 (In thousands) Unrealized gains on securities available for sale Unrealized gains on derivative instruments designated as cash flow hedges Unrealized gains on defined benefit pension plans Accumulated other comprehensive income Balance at December 31, 2019 $ 19,605 $ 95,097 $ — $ 114,702 Net change 45,842 120,129 — 165,971 Balance at March 31, 2020 $ 65,447 $ 215,226 $ — $ 280,673 Three Months Ended March 31, 2019 Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Unrealized gains (losses) on defined benefit pension plans Accumulated other comprehensive income (loss) Balance at December 31, 2018 $ (24,279 ) $ (18,305 ) $ (328 ) $ (42,912 ) Net change 22,602 38,171 — 60,773 Balance at March 31, 2019 $ (1,677 ) $ 19,866 $ (328 ) $ 17,861

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Note 19—Subsequent Events On April 28, 2020, the Board of Directors of Cadence Bancorporation approved a quarterly cash dividend in the amount of $0.05 per share of outstanding common stock, representing an annualized dividend of $0.20 per share. The dividend will be paid on May 15, 2020 to holders of record of Cadence’s Class A common stock on May 8, 2020.

Summary of Accounting Policies

Summary of Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying unaudited consolidated financial statements for the Company have been prepared in accordance with 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 accounting principles generally accepted in the United States of America (“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. These interim financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2019. Operating results for the period ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. The Company and its subsidiaries follow accounting principles generally accepted in the United States of America, including, where applicable, general practices within the banking industry. The unaudited consolidated financial statements include the accounts of the Company and its subsidiaries. Significant intercompany accounts and transactions have been eliminated in consolidation. The assessment of whether or not the Company has a controlling interest (i.e., the primary beneficiary) in a variable-interest entity (“VIE”) is performed on an on-going basis. All equity investments in non-consolidated VIEs are included in “other assets” in the Company’s consolidated balance sheets (see Note 15). Certain amounts reported in prior years have been reclassified to conform to the 2020 presentation. These reclassifications did not materially impact the Company’s consolidated balance sheets or consolidated statements of operations. In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 855, Subsequent Events
Nature of Operations	Nature of Operations The Company’s primary subsidiary is the Bank. The Bank operates under a national bank charter and is subject to regulation by the Office of the Comptroller of the Currency (“OCC”). The Bank provides full banking services in six southern states: Alabama, Florida, Georgia, Mississippi, Tennessee, and Texas. The Bank’s operating subsidiaries include: • Linscomb & Williams, Inc. — financial advisory firm; • Cadence Investment Services, Inc. — provides investment and insurance products; and • Altera Payroll and Insurance, Inc. — provides payroll processing services and the sale of certain insurance products. The Company and the Bank also have certain other non-operating and immaterial subsidiaries.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of goodwill, intangible assets, and deferred income taxes.
Related Party Transactions	Related Party Transactions In the normal course of business, loans are made to directors and executive officers and to companies in which they have a significant ownership interest. In the opinion of management, these loans are made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other parties, are consistent with sound banking practices, and are within applicable regulatory and lending limitations. The aggregate balances of related party loans and deposits are insignificant as of March 31, 2020 and December 31, 2019.
Loans and Allowances for Credit Losses	Loans and Allowances for Credit Losses (“ACL”) In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments Codification Improvements to Topic 326, Financial Instruments–Credit Losses Codification Improvements to Topic 326, Financial Instruments–Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments Financial Instruments–Credit Losses (Topic 326): Targeted Transition Relief Financial Instruments–Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates Codification Improvements to Topic 326, Financial Instruments–Credit Losses • Replaces the current incurred loss accounting model with an expected loss approach and requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. • Eliminates existing guidance for acquired credit impaired (“ACI”) loans and requires recognition of the nonaccretable difference as an increase to the allowance for expected credit losses on financial assets purchased with more than insignificant credit deterioration since origination, referred to as purchase credit deteriorated (“PCD”) assets, which will be offset by an increase in the amortized cost of the related loans. For ACI loans accounted for under ASC 310-30 prior to adoption, the guidance in this amendment for PCD assets will be prospectively applied. • Requires inclusion of expected recoveries, limited to the cumulative amount of prior write-offs, when estimating the allowance for credit losses for in-scope financial assets (including collateral dependent assets). • Amends existing impairment guidance for available-for-sale securities to incorporate an allowance, which will allow for reversals of credit impairments if the credit of an issuer improves. • Requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. The amendments in these updates became effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. The Company adopted ASC 326 effective January 1, 2020, using the cumulative effect method. As a result of this adoption, the Company recognized an adjustment to retained earnings of $62.8 million, recorded a deferred tax asset of $19.5 million, and reclassed ACL of $6.1 million with respect to PCD loans, formerly ACI loans, as of January 1, 2020. Because the Company adopted ASC 326 with a cumulative effect adjustment as of January 1, 2020, the comparative results as of December 31, 2019, and for the three months ended March 31, 2019, have not been restated and continue to be reported under the incurred loss accounting model. The Company has elected the transition provisions provided by the banking agencies and will phase in the “Day One” regulatory capital effects resulting from adoption of CECL. See Note 12 for additional disclosure. Other changes to the Company’s significant accounting policies pertaining to Loans and the ACL as incorporated under ASC 326 are as follows: • In accordance with ASC 326, the Company uses amortized cost as a basis for determining the ACL; whereas, prior to adopting ASC 326, under the incurred loss accounting model the Company used recorded investment. The components of amortized cost include unpaid principal balance (“UPB”), and unamortized discounts and premiums. As permitted by ASC 326, the Company has elected to not include accrued interest receivable in the determination of amortized cost and measurement of expected credit losses and, instead, has an accounting policy to write off accrued interest deemed uncollectible in a timely manner. • ASC 326 provides special initial recognition and measurement for the Day One accounting for PCD assets. o ASC 326 requires entities that purchase certain financial assets (or portfolios of financial assets) with the intention of holding them for investment to determine whether the assets have experienced more-than-insignificant deterioration in credit quality since origination. o More-than-insignificant deterioration will generally be determined by the asset’s delinquency status, risk rating changes, credit rating, accruing status or other indicators of credit deterioration since origination. o An entity initially measures the amortized cost of a PCD asset by adding the acquisition date estimate of expected credit losses to the asset’s purchase price. Because the initial estimate for expected credit losses is added to the purchase price to establish the Day One amortized cost, PCD accounting is commonly referred to as a “gross-up” approach. There is no credit loss expense recognized upon acquisition of a PCD asset; rather the “gross-up” is offset by establishment of the initial allowance. o After initial recognition, the accounting for a PCD asset will generally follow the credit loss model. o Interest income for a PCD asset is recognized using the effective interest rate (“EIR”) calculated at initial measurement. This EIR is determined by comparing the amortized cost basis of the instrument to its contractual cash flows, consistent with ASC 310-20. Accordingly, since the PCD gross-up is included in the amortized cost, the purchase discount related to estimated credit losses on acquisition is not accreted into interest income. Only any noncredit-related discount or premium is accreted or amortized, using the EIR that was calculated at the time the asset was acquired. • Commercial loans are generally placed on nonaccrual status when principal or interest is past due 90 days or more unless the loan is well secured and in the process of collection. Consumer loans, including residential first and second lien loans secured by real estate, are generally placed on nonaccrual status when they are 120 or more days past due. Prior to the adoption of ASC 326, the majority of our current PCD loans were treated as accruing loans as the Company was able to reasonably predict future cash flows at the unit of account or pool level. After adoption, the accruing status of each individual loan will be subject to the nonaccrual polices described above. • The accrual of interest, as well as the amortization/accretion of any remaining unamortized net deferred fees or costs and discount or premium, is generally discontinued at the time the loan is placed on nonaccrual status. All accrued but uncollected interest for loans that are placed on nonaccrual status is reversed through interest income. Cash receipts received on nonaccrual loans are generally applied against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income (i.e., cost recovery method). However, interest may be accounted for under the cash-basis method as long as the remaining amortized costs in the loan is deemed fully collectible. The ACL is maintained through charges to income in the form of a provision for credit losses at a level management believes is adequate to absorb an estimate of expected credit losses over the contractual life of the loan portfolio as of the reporting date. Events that are not within the Company’s control, such as changes in economic factors, could change subsequent to the reporting date and could cause the ACL to be overstated or understated. The amount of the ACL is affected by loan charge-offs, which decrease the ACL; recoveries on loans previously charged off, which increase the ACL; and the provision for credit losses charged to income, which increases the ACL. The following is a description of the Company’s process for estimating the ACL for all loans in its portfolio, including PCD loans: • The quantitative component of the Company’s ACL model includes three segments: commercial (“C&I”), commercial real estate (“CRE”), and consumer. o The C&I loan segment includes loans to clients in specialized industries, including restaurant, healthcare, and technology. Additional commercial lending activities include energy, general corporate loans, business banking and community banking loans. The C&I segment uses loan level through-the-cycle probability-of-default (“PD”) and loss-given-default (“LGD”) ratings generated by Cadence’s scorecards. These PD ratings are conditioned by industry to reflect the effect of certain forecasted macroeconomic variables, such as market value and volatility, interest rate spreads, and unemployment rate. o The CRE loan segment includes loans which are secured by a variety of property types, including multi-family dwellings, office buildings, industrial properties, and retail facilities. The Company offers construction financing, acquisition or refinancing of properties primarily located in our markets in Texas and the southeast United States. The CRE loan segment uses a loss-rate model, where lifetime loss rates are correlated closely with characteristics such as origination LTV, vintage/origination quality, and loan age, as well as with macroeconomic factors, including GDP growth rate, unemployment rate, and CRE market price change. o The consumer loan segment primarily consists of one-to-four family residential real estate loans with terms ranging from 10 to 30 years; however, the portfolio is heavily weighted to the 30-year term. The Company offers both fixed and adjustable interest rates and does not originate subprime loans. These loans are typically closed-end first lien loans for purposes of purchasing property, or for refinancing existing loans with or without cash out. Our loans are primarily owner occupied, full documentation loans. This segment also offers consumer loans to our customers for personal, family and household purposes, auto, boat and personal installment loans, however, these loans are a small percentage of the portfolio. The consumer loan segment uses a loss-rate model. Life-time loss rates capture the effect of credit score , loan age, size, and other loan characteristics and include Cadence’s own assumptions for LGD and the expected life of the loan. The loss rates are also affected by macroeconomic variables such as the unemployment rate, retails sales percent change year-over-year, household employment percent change year-over-year, FHFA home price index, housing affordability index at origination, and median house price. o When foreclosure of collateral securing a loan is probable, ASC 326 requires that the expected credit loss on a loan be measured based on the fair value of the collateral. When management’s measured value of the impaired loan is less than the amortized cost in the loan, the amount of the impairment is recorded as a specific reserve. These specific reserves are determined on an individual loan basis based on management’s current evaluation of the loss exposure for each credit, given the payment status, the financial condition of the borrower and any guarantors and the value of any underlying collateral. Loans that are individually evaluated are excluded from the collective evaluations described above. Changes in specific reserves from period to period are the result of changes in the circumstances of individual loans such as charge-offs, payments received, changes in collateral values or other factors. o For any collateral dependent loan where foreclosure is not probable, but repayment is expected to be provided primarily from the sale or operation of the collateral and the borrower is experiencing financial difficulty, a practical expedient for measuring the credit loss is allowed using the fair value of the collateral. The Company expects to elect this for qualifying credits particularly when there are unique risk characteristics which prohibit them from being collectively evaluated. When repayment will be from the operation of the collateral, generally fair value is estimated on the present value of expected cash flows from the operation of the collateral (an income approach). When repayment is expected from the sale of the collateral, the present value of the costs to sell will be deducted from the fair value of the collateral measured as of the measurement date. • As described above, loans included in each segment are collectively or individually evaluated to determine an expected credit loss which is allocated to the individual loans. Due to the growth of the credit portfolio into new geographic areas and into new commercial markets and the lack of seasoning of the portfolio, the Company recognizes there is limited historical loss information to adequately estimate loss rates based primarily on the Company’s historical loss data. Therefore, external loss data was acquired from the research arm of a nationally recognized risk rating agency to act as a proxy for loss rates within the ACL models until sufficient loss history can be accumulated from the Company’s loss experience in these segments. These loss rates were developed specifically for the Company’s customer risk profile and portfolio mix. • ASC 326 acknowledges that, because historical experience may not fully reflect an institution's expectations about the future, the institution should adjust historical loss information, as necessary, to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information. The quantitative models use baseline macroeconomic scenario forecast data provided by a nationally recognized rating agency for a reasonable and supportable period in estimating the current expected credit losses. The Company has elected an input reversion approach whereby the selected economic forecast for the identified macroeconomic variables revert to their historical trends. As a rule, the forecasts revert to their long-term equilibrium within two to five years or one “business cycle” depending on the segment The Company monitors actual loss experience for each loan segment for adjustments required to the loss rates utilized. • Additionally, to adjust historical credit loss information for current conditions and reasonable and supportable forecasts, all significant factors relevant to determining the expected collectability of financial assets as of each reporting date should be considered. ASC 326 provides examples of factors an institution may consider. The banking regulatory agencies believe the qualitative or environmental factors identified in the December 2006 Interagency Policy Statement on the Allowance for Loan and Lease Losses should continue to be relevant under CECL and are covered by the examples of factors that may be considered under ASC 326. These factors require judgments that cannot be subjected to exact mathematical calculation. There are no formulas for translating them into a basis-point adjustment to be applied to historical losses. The adjustment must reflect management’s overall estimate of the extent to which expected losses on a segment of loans will differ from historical loss experience. It would include management’s opinion on the effects related to current conditions and reasonable and supportable forecasts, that are not already reflected in the quantitative loss estimate. These adjustments are highly subjective estimates that will be determined each quarter. To facilitate this process, management has developed certain analyses of selected internal and external data to assist management in determining the risk of imprecision. These primary adjustment factors include, but are not limited to the following: o Lending policies, procedures, practices or philosophy, including underwriting standards and collection, charge-off and recovery practices o Changes in national and service market economic and business conditions that could affect the level of default rates or the level of losses once a default has occurred within the Bank’s existing loan portfolio o Changes in the nature or size of the portfolio o Changes in portfolio collateral values o Changes in the experience, ability, and depth of lending management, and other relevant staff o Volume and/or severity of past due and classified credits or trends in the volume of losses, non-accrual credits, impaired credits, and other credit modifications o Quality of the institution’s credit review system and processes and the degree of oversight by bank management and the board of directors o Concentrations of credit such as industry and lines of business o Competition and legal and regulatory requirements or other external factors • The reserve for unfunded commitments is determined by assessing three distinct components: unfunded commitment volatility in the portfolio (excluding commitments related to letters of credit and commitment letters), adversely rated letters of credit, and adversely rated lines of credit. Unfunded commitment volatility is calculated on a trailing nine quarter basis; the resulting expected funding amount is then reserved for based on the current combined reserve rate of the funded portfolio. Adverse letters and lines of credit are assessed individually based on funding and loss expectations as of the period end. The reserve for unfunded commitments is recorded in other liabilities and the provision for losses on unfunded commitments is included in the provision for credit losses. Prior to adoption, the provision for losses on unfunded commitments was recorded in other noninterest expense. As of March 31, 2020, and December 31, 2019, the reserve for unfunded commitments totaled $3.2 million and $2.0 million, respectively.
Recently Adopted and Pending Accounting Pronouncements	Recently Adopted Accounting Pronouncements In January 2017, the FASB issued ASU No. 2017-04, Intangibles–Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework–Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-15, Intangibles–Goodwill and Other–Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force) . This standard aligns the requirements for capitalizing implementation costs in a hosting arrangement service contract with the existing guidance for capitalizing implementation costs incurred for an internal-use software license. This standard also requires capitalizing or expensing implementation costs based on the nature of the costs and the project stage during which they are incurred and establishes additional disclosure requirements. This standard became effective for Cadence on January 1, 2020. The adoption of this guidance had no material impact on the consolidated financial statements. In October 2018, the FASB issued ASU No. 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities In April 2019, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments–Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments The credit losses and hedging amendments have the same effective dates as the respective standards, unless an entity has already adopted the standards. The adoption of the credit loss standard, or CECL, is discussed above. Since the Company early adopted the guidance in ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities In February 2020, the FASB issued ASU No. 2020-02, Financial Instruments—Credit Losses (Topic 326) and Leases (Topic 842)—Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842) (SEC Update) In March 2020, the FASB issued ASU No. 2020-03, Codification Improvements to Financial Instruments In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting P ending Accounting Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)—Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the FASB Emerging Issues Task Force)

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Summary of Purchase Price Allocation and Consideration Paid	The following table provides the purchase price allocation and the consideration paid for State Bank’s net assets. (In thousands, except shares and per share data) As Recorded by Cadence Assets Cash and cash equivalents $ 414,342 Investment securities available-for-sale 667,865 Loans held for sale 148,469 Loans 3,317,897 Premises and equipment 65,646 Cash surrender value of life insurance 69,252 Intangible assets 117,038 Other assets 47,146 Total assets acquired $ 4,847,655 Liabilities Deposits $ 4,096,665 Short term borrowings 23,899 Other liabilities 76,368 Total liabilities assumed 4,196,932 Net identifiable assets acquired over liabilities assumed 650,723 Goodwill 175,657 Net assets acquired over liabilities assumed $ 826,380 Consideration: Cadence Bancorporation common shares issued 49,232,008 Fair value per share of the Company's common stock $ 16.78 Company common stock issued 826,113 Fair value of unexercised warrants 267 Fair value of total consideration transferred $ 826,380

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2020
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Value of Securities Available-for-Sale	A summary of amortized cost and estimated fair value of securities available-for-sale at March 31, 2020 and December 31, 2019 is as follows: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value March 31, 2020 Securities available-for-sale: Obligations of U.S. government agencies $ 70,225 $ 221 $ 458 $ 69,988 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 99,869 2,799 — 102,668 Issued by FNMA and FHLMC 1,453,735 52,507 — 1,506,242 Other residential mortgage-backed securities 268,906 11,249 — 280,155 Commercial mortgage-backed securities 271,590 11,580 941 282,229 Total MBS 2,094,100 78,135 941 2,171,294 Obligations of states and municipal subdivisions 211,312 9,431 381 220,362 Total securities available-for-sale $ 2,375,637 $ 87,787 $ 1,780 $ 2,461,644 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value December 31, 2019 Securities available-for-sale: Obligations of U.S. government agencies $ 69,464 $ 57 $ 415 $ 69,106 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 98,122 1,205 245 99,082 Issued by FNMA and FHLMC 1,423,771 13,128 1,402 1,435,497 Other residential mortgage-backed securities 292,019 4,197 384 295,832 Commercial mortgage-backed securities 276,533 2,448 3,023 275,958 Total MBS 2,090,445 20,978 5,054 2,106,369 Obligations of states and municipal subdivisions 185,882 7,235 — 193,117 Total securities available-for-sale $ 2,345,791 $ 28,270 $ 5,469 $ 2,368,592
Schedule of Contractual Maturities of Securities Available-for-Sale	The scheduled contractual maturities of securities available-for-sale at March 31, 2020 were as follows: Amortized Estimated (In thousands) Cost Fair Value Due in one year or less $ 1,222 $ 1,226 Due after one year through five years 1,157 1,148 Due after five years through ten years 61,915 61,672 Due after ten years 217,243 226,304 Mortgage-backed securities 2,094,100 2,171,294 Total $ 2,375,637 $ 2,461,644
Summary of Gross Gains, and Gross Losses on Sales of Securities Available for Sale	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. For the Three Months Ended March 31, (In thousands) 2020 2019 Gross realized gains $ 2,994 $ 3 Gross realized losses — (15 ) Realized gains (losses), net $ 2,994 $ (12 )
Schedule of Securities Classified as Available-for-Sale with Gross Unrealized Losses Aggregated by Category and Length of Time	Information pertaining to Unrealized Loss Analysis Losses < 12 Months Losses > 12 Months (In thousands) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses March 31, 2020 Obligations of U.S. government agencies $ 29,360 $ 278 $ 12,896 $ 180 Mortgage-backed securities 72,267 574 10,143 367 Obligations of states and municipal subdivisions 22,495 381 — — Total $ 124,122 $ 1,233 $ 23,039 $ 547 Unrealized Loss Analysis Losses < 12 Months Losses > 12 Months (In thousands) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses December 31, 2019 Obligations of U.S. government agencies $ 33,053 $ 209 $ 13,703 $ 206 Mortgage-backed securities 708,991 4,466 61,506 588 Obligations of states and municipal subdivisions — — — — Total $ 742,044 $ 4,675 $ 75,209 $ 794

Loans Held for Sale, Loans an_2

Loans Held for Sale, Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Summary of Loans Held for Sale by Portfolio Segment	The following table presents a summary of the loans held for sale by portfolio segment at the lower of amortized cost or fair value as of March 31, 2020 and December 31, 2019. (In thousands) March 31, 2020 December 31, 2019 Commercial and industrial $ 33,023 $ 34,767 Commercial real estate 2,913 49,894 Consumer 2,285 2,988 Total loans held for sale (1) $ 38,221 $ 87,649 (1) $0.1 million and $0.4 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020 and December 31, 2019, respectively.
Summary of Total Loans Outstanding by Portfolio Segment and Class of Financing Receivable	The following table presents total loans outstanding by portfolio segment and class of financing receivable as of March 31, 2020 and December 31, 2019. Outstanding balances include originated loans, Acquired Noncredit Impaired (“ANCI”) loans, and Purchase Credit Deteriorated (“PCD”) loans, formerly referred to as acquired credit impaired (“ACI”) loans. See Note 1 for additional information regarding the adoption of the new CECL accounting standard (2) (In thousands) March 31, 2020 December 31, 2019 Commercial and industrial General C&I $ 4,694,114 $ 4,517,016 Energy 1,480,497 1,419,957 Restaurant 1,082,602 1,027,421 Healthcare 492,097 474,264 Total commercial and industrial 7,749,310 7,438,658 Commercial real estate Industrial, retail, and other 1,754,881 1,691,694 Multifamily 692,168 659,902 Office 533,711 535,676 Total commercial real estate 2,980,760 2,887,272 Consumer Residential 2,576,073 2,568,295 Other 86,048 89,430 Total consumer 2,662,121 2,657,725 Total (1) $ 13,392,191 $ 12,983,655 (1) (2)
Summary of Allowance for Credit Losses	The following tables provide a summary of the activity in the ACL and the Reserve for Unfunded Commitments for the three months ended March 31, 2020 and 2019 . For the Three Months Ended March 31, 2020 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Total Allowance for Credit Losses Reserve for Unfunded Commitments (1) Total As of December 31, 2019 $ 89,796 $ 15,319 $ 14,528 $ 119,643 $ 1,699 $ 121,342 Cumulative effect of adoption of CECL 32,951 20,599 22,300 75,850 332 76,182 As of January 1, 2020 122,747 35,918 36,828 195,493 2,031 197,524 Provision for credit losses 63,684 17,798 756 82,238 1,191 83,429 Charge-offs (31,987 ) (478 ) (633 ) (33,098 ) — (33,098 ) Recoveries 141 180 292 613 — 613 As of March 31, 2020 $ 154,585 $ 53,418 $ 37,243 $ 245,246 $ 3,222 $ 248,468 Allocation of ending ACL Loans collectively evaluated $ 135,486 $ 53,418 $ 37,243 $ 226,147 Loans individually evaluated 19,099 — — 19,099 ACL as of March 31, 2020 $ 154,585 $ 53,418 $ 37,243 $ 245,246 Loans (amortized cost) Loans collectively evaluated $ 7,609,527 $ 2,975,416 $ 2,659,630 $ 13,244,573 Loans individually evaluated 139,783 5,344 2,491 147,618 Loans as of March 31, 2020 (2) $ 7,749,310 $ 2,980,760 $ 2,662,121 $ 13,392,191 (1) The reserve for unfunded commitments is included in other liabilities on the consolidated balance sheets at March 31, 2020 and December 31, 2019. (2) $45.3 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020. For the Three Months Ended March 31, 2019 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Small Business Total Allowance for Credit Losses As of December 31, 2018 $ 66,316 $ 10,452 $ 13,703 $ 3,907 $ 94,378 Provision for credit losses 9,299 102 1,206 603 11,210 Charge-offs (461 ) (85 ) (234 ) (158 ) (938 ) Recoveries 372 — 15 1 388 As of March 31, 2019 (1) $ 75,526 $ 10,469 $ 14,690 $ 4,353 $ 105,038 Allocation of ending ACL Loans collectively evaluated for impairment $ 61,020 $ 10,462 $ 14,625 $ 4,294 $ 90,401 Loans individually evaluated for impairment 14,506 7 65 59 14,637 ACL as of March 31, 2019 (1) $ 75,526 $ 10,469 $ 14,690 $ 4,353 $ 105,038 Loans Loans collectively evaluated for impairment $ 7,389,053 $ 2,823,249 $ 2,637,416 $ 758,586 $ 13,608,304 Loans individually evaluated for impairment 92,635 6,946 2,102 256 101,939 Loans as of March 31, 2019 (1) $ 7,481,688 $ 2,830,195 $ 2,639,518 $ 758,842 $ 13,710,243 (1)
Summary of Credit Quality Indicator and by Origination Year	The following table provides information by each credit quality indicator and by origination year (vintage) as of March 31, 2020. The Company defines origination year (vintage) for the purposes of disclosure as the year of execution of the original loan agreement. Loans that are modified as a TDR are considered to be a continuation of the original loan, therefore the origination date of the original loan is reflected as the vintage date. This presentation is consistent with the vintage determination used in the ACL model. The criticized loans with a 2020 vintage relate to credits in resolution. There were no line-of-credit arrangements converted to term loans during the period. Amortized Cost Basis by Origination Year (In thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Loans Total Commercial and industrial Pass $ 174,633 $ 796,988 $ 1,155,772 $ 713,223 $ 397,273 $ 738,601 $ 3,179,764 $ 7,156,254 Special mention 261 7,690 69,934 34,365 39,415 16,712 86,730 255,107 Substandard 583 5,949 76,623 26,435 35,471 58,585 114,862 318,508 Doubtful — 1,784 3,460 765 — 7,126 6,306 19,441 Total commercial and industrial 175,477 812,411 1,305,789 774,788 472,159 821,024 3,387,662 7,749,310 Commercial real estate Pass 109,070 406,225 737,092 692,826 274,966 562,834 141,895 2,924,908 Special mention 1,495 346 25,125 945 293 3,221 279 31,704 Substandard — 210 170 607 7,455 15,694 12 24,148 Doubtful — — — — — — — — Total commercial real estate 110,565 406,781 762,387 694,378 282,714 581,749 142,186 2,980,760 Consumer Current 79,008 471,638 646,405 356,462 320,817 504,905 252,225 2,631,460 30-59 days past due — 1,506 4,076 340 1,795 7,443 2,358 17,518 60-89 days past due — 309 1,134 76 1,075 1,494 221 4,309 90+ days past due — 147 2,159 8 1,540 4,980 — 8,834 Total consumer 79,008 473,600 653,774 356,886 325,227 518,822 254,804 2,662,121 Total (1) $ 365,050 $ 1,692,792 $ 2,721,950 $ 1,826,052 $ 1,080,100 $ 1,921,595 $ 3,784,652 $ 13,392,191 (1) $45.3 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020.
Past Due Financing Receivables	The following tables provide an aging analysis of past due loans by portfolio segment and class of financing receivable. Age Analysis of Past-Due Loans as of March 31, 2020 90+ Days (In thousands) 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due Total Current Total (1) Past Due and Accruing Commercial and industrial General C&I $ 4,903 $ 794 $ 28,945 $ 34,642 $ 4,659,472 $ 4,694,114 $ 13 Energy — — — — 1,480,497 1,480,497 — Restaurant 871 8,413 6,634 15,918 1,066,684 1,082,602 24 Healthcare 1,201 52 2,504 3,757 488,340 492,097 — Total commercial and industrial 6,975 9,259 38,083 54,317 7,694,993 7,749,310 37 Commercial real estate Industrial, retail, and other 2,486 1,272 1,772 5,530 1,749,350 1,754,880 2 Multifamily — — — — 692,169 692,169 — Office 327 — 1,136 1,463 532,248 533,711 — Total commercial real estate 2,813 1,272 2,908 6,993 2,973,767 2,980,760 2 Consumer Residential 17,325 4,283 8,826 30,434 2,545,640 2,576,074 1,960 Other 193 26 8 227 85,820 86,047 — Total consumer 17,518 4,309 8,834 30,661 2,631,460 2,662,121 1,960 Total $ 27,306 $ 14,840 $ 49,825 $ 91,971 $ 13,300,220 $ 13,392,191 $ 1,999 (1) Age Analysis of Past-Due Loans as of December 31, 2019 90+ Days (In thousands) 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due Total Current Total (1) Past Due and Accruing Commercial and industrial General C&I $ 23,143 $ 1,117 $ 15,183 $ 39,443 $ 4,477,573 $ 4,517,016 $ 85 Energy — — 8,166 8,166 1,411,791 1,419,957 — Restaurant 1,219 1,284 8,021 10,524 1,016,897 1,027,421 108 Healthcare 497 41 4,143 4,681 469,583 474,264 — Total commercial and industrial 24,859 2,442 35,513 62,814 7,375,844 7,438,658 193 Commercial real estate Industrial, retail, and other 3,354 133 2,255 5,742 1,685,952 1,691,694 — Multifamily — — — — 659,902 659,902 — Office 253 — 1,219 1,472 534,204 535,676 — Total commercial real estate 3,607 133 3,474 7,214 2,880,058 2,887,272 — Consumer Residential 8,967 6,101 7,292 22,360 2,545,935 2,568,295 887 Other 192 37 54 283 89,147 89,430 40 Total consumer 9,159 6,138 7,346 22,643 2,635,082 2,657,725 927 Total $ 37,625 $ 8,713 $ 46,333 $ 92,671 $ 12,890,984 $ 12,983,655 $ 1,120 (1)
Summary of Nonaccruing Loans by Portfolio Segment and Class of Financing Receivable	The following table provides information about nonaccruing loans by portfolio segment and class of financing receivable as of and for the three months ended March 31, 2020. Nonaccrual Loans - Amortized Cost 90+ Days (In thousands) Beginning of the Period (1) End of the Period No Allowance Recorded Past Due and Accruing Interest Income Recognized Commercial and industrial General C&I $ 66,589 $ 62,517 $ 11,580 $ 13 $ — Energy 9,568 19,171 1,137 — 8 Restaurant 53,483 52,603 19,220 24 29 Healthcare 4,833 3,011 1,952 — — Total commercial and industrial 134,473 137,302 33,889 37 37 Commercial real estate Industrial, retail, and other 5,935 6,385 4,301 2 43 Multifamily — — — — — Office 1,245 1,159 1,044 — — Total commercial real estate 7,180 7,544 5,345 2 43 Consumer Residential 15,101 14,799 2,491 1,960 30 Other 24 8 — — 2 Total consumer 15,125 14,807 2,491 1,960 32 Total (2) $ 156,778 $ 159,653 $ 41,725 $ 1,999 $ 112 (1) Amounts are not comparable to prior period public filings due to our adoption of CECL on January 1, 2020. Prior to this date, pools of individual ACI loans were excluded because they continued to earn interest income from the accretable yield at the pool level. With the adoption of CECL, the pools were discontinued, and performance is based on contractual terms for individual loans. Additionally, prior to January 1, 2020, nonaccrual balances were presented using recorded investment. Upon adoption of CECL, approximately $43.0 million of ACI loans were reclassed to nonaccrual loans. (2) $45.3 million and $44.5 million of net accrued interest receivable is excluded from the total nonaccrual loan balances above as of March 31, 2020 and December 31, 2019, respectively.
Summary of Information Regarding Loans and Types of Loan Modified into TDRs	The following table provides information regarding loans that were modified into TDRs during the periods indicated. For the Three Months Ended March 31, 2020 2019 (Dollars in thousands) Number of TDRs Amortized Cost (1) Number of TDRs Amortized Cost Commercial and industrial 7 $ 65,691 1 $ 24,369 Total 7 $ 65,691 1 $ 24,369 (1) Less than $0.1 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020. The following table provides information regarding the types of loan modifications that were modified into TDRs during the periods indicated. For the Three Months Ended March 31, 2020 2019 Number of Loans Modified by: Rate Concession Modified Terms and/or Other Concessions Rate Concession Modified Terms and/or Other Concessions Commercial and industrial 1 6 — 1 Total 1 6 — 1

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Goodwill and Other Intangible Assets	The following table summarizes the Company’s goodwill and other intangible assets at March 31, 2020 and December 31, 2019: (In thousands) March 31, 2020 December 31, 2019 Goodwill $ 43,061 $ 485,336 Core deposit intangible, net of accumulated amortization of $65,793 and $60,836, respectively 85,829 90,788 Customer lists, net of accumulated amortization of $22,488 and $21,908, respectively 11,369 11,993 Noncompete agreements, net of accumulated amortization of $172 and $137, respectively 1,184 1,473 Trademarks, net of accumulated amortization of $95 and $75, respectively 1,339 1,359 Total goodwill and intangible assets, net $ 142,782 $ 590,949
Summary of Changes to Carrying Amount of Goodwill by Segment	The following table represents changes to the carrying amount of goodwill by segment for the period reported. (In thousands) Banking Financial Services Corporate Consolidated Balance as of December 31, 2019 $ 442,579 $ 42,757 $ — $ 485,336 Additions: Wealth & Pension acquisition — 304 — 304 Other 1,116 — — 1,116 Losses: Impairment (443,695 ) — — (443,695 ) Balance as of March 31, 2020 $ — $ 43,061 $ — $ 43,061

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts and Estimated Fair Values	The notional amounts and estimated fair values as of March 31, 2020 and December 31, 2019 were as follows: March 31, 2020 December 31, 2019 Fair Value Fair Value (In thousands) Notional Amount Other Assets Other Liabilities Notional Amount Other Assets Other Liabilities Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ 350,000 $ 23,497 $ — $ 350,000 $ — $ 643 Commercial loan interest rate collars — — — 4,000,000 239,213 — Total derivatives designated as hedging instruments 350,000 23,497 — 4,350,000 239,213 643 Derivatives not designated as hedging instruments: Commercial loan interest rate swaps 1,203,681 24,533 1,956 1,008,805 8,386 899 Commercial loan interest rate caps 171,470 11 11 167,185 18 18 Commercial loan interest rate floors 613,250 15,634 15,634 654,298 8,836 8,836 Commercial loan interest rate collars 73,332 711 711 75,555 257 257 Mortgage loan held-for-sale interest rate lock commitments 21,350 333 — 4,138 22 — Mortgage loan forward sale commitments 2,705 — 23 4,109 26 — Mortgage loan held-for-sale floating commitments 7,732 — — 1,523 — — Foreign exchange contracts 73,937 1,614 1,208 74,322 379 558 Total derivatives not designated as hedging instruments 2,167,457 42,836 19,543 1,989,935 17,924 10,568 Total derivatives $ 2,517,457 $ 66,333 $ 19,543 $ 6,339,935 $ 257,137 $ 11,211
Schedule of Gain (Loss) in Consolidated Statements of Income Related to Derivative Instruments	Pre-tax For the Three Months Ended March 31, 2020 2019 (In thousands) OCI Reclassified from AOCI to interest income Noninterest income OCI Reclassified from AOCI to interest income Noninterest income Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ 24,035 $ (106 ) $ — $ 6,656 $ (1,508 ) $ — Commercial loan interest rate collars 143,198 8,213 — 41,477 — — Derivatives not designated as hedging instruments: Mortgage loans held for sale interest rate lock commitments $ — $ — $ 311 $ — $ — $ 69 Foreign exchange contracts 865 — — 1,140
Schedule of Interest Rate Swap Agreements	In March 2016, the Company entered into the following interest rate swap agreements to manage overall cash flow changes related to interest rate risk exposure on benchmark interest rate loans. Effective Date Maturity Date Notional Amount (In Thousands) Fixed Rate Variable Rate March 8, 2016 February 27, 2026 $ 175,000 1.5995 % 1 Month LIBOR March 8, 2016 February 27, 2026 175,000 1.5890 1 Month LIBOR

Borrowed Funds (Tables)

Borrowed Funds (Tables)	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Summary of Debt	Details of the debt transactions are as follows: (In thousands) March 31, 2020 December 31, 2019 Cadence Bancorporation: 5.375% senior notes, due June 28, 2021 $ 50,000 $ 50,000 7.250% subordinated notes, due June 28, 2029, callable in 2024 35,000 35,000 6.500% subordinated notes, due March 2025 40,000 40,000 4.750% subordinated notes, due June 2029 85,000 85,000 Total — Cadence Bancorporation 210,000 210,000 Cadence Bank: 6.250% subordinated notes, due June 28, 2029, callable in 2024 25,000 25,000 Debt issue costs and unamortized premium (2,013 ) (2,350 ) Total senior and subordinated debt $ 232,987 $ 232,650
Summary of Junior Subordinated Debt	The following is a list of junior subordinated debt: (In thousands) March 31, 2020 December 31, 2019 Junior subordinated debentures, 3 month LIBOR plus 2.85%, due 2033 $ 30,000 $ 30,000 Junior subordinated debentures, 3 month LIBOR plus 2.95%, due 2033 5,155 5,155 Junior subordinated debentures, 3 month LIBOR plus 1.75%, due 2037 15,464 15,464 Total par value 50,619 50,619 Purchase accounting adjustment, net of amortization (13,268 ) (13,174 ) Total junior subordinated debentures $ 37,351 $ 37,445

Other Noninterest Income and _2

Other Noninterest Income and Other Noninterest Expense (Tables)	3 Months Ended
	Mar. 31, 2020
Other Nonoperating Income Expense [Abstract]
Summary of Other Noninterest Income and Other Noninterest Expense	The detail of other noninterest income and other noninterest expense captions presented in the consolidated statements of operations is as follows: Three Months Ended March 31, (In thousands) 2020 2019 Other noninterest income Insurance revenue $ 249 $ 198 Mortgage banking income 1,111 579 Income from bank owned life insurance policies 1,328 1,152 Other (577 ) 1,585 Total other noninterest income $ 2,111 $ 3,514 Three Months Ended March 31, (In thousands) 2020 2019 Other noninterest expenses Data processing expense $ 3,352 $ 2,594 Software amortization 3,547 3,335 Consulting and professional fees 2,707 2,229 Loan related expenses 760 910 FDIC insurance 2,436 1,752 Communications 1,156 998 Advertising and public relations 1,464 781 Legal expenses 411 158 Other 11,636 8,181 Total other noninterest expenses $ 27,469 $ 20,938

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Net (Loss) Income Per Common Share	The following table displays a reconciliation of the information used in calculating basic and diluted net (loss) income per common share for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, (In thousands, except share and per share data) 2020 2019 Net (loss) income per consolidated statements of operations $ (399,311 ) $ 58,201 Net income allocated to participating securities — (173 ) Net (loss) income allocated to common stock $ (399,311 ) $ 58,028 Weighted average common shares outstanding (Basic) 126,630,446 130,485,521 Weighted average dilutive restricted stock units and warrants — 63,798 Weighted average common shares outstanding (Diluted) 126,630,446 130,549,319 (Loss) earnings per common share (Basic) $ (3.15 ) $ 0.44 (Loss) earnings per common share (Diluted) $ (3.15 ) $ 0.44

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2020
Banking And Thrift [Abstract]
Schedule of Actual Capital Amounts and Ratios	The actual capital amounts and ratios for the Company and the Bank as of March 31, 2020 and December 31, 2019 are presented in the following tables and as shown, are above the thresholds necessary to be considered “well-capitalized.” Management believes that no events or changes have occurred after March 31, 2020 that would change this designation. Consolidated Company Bank (In thousands) Amount Ratio Amount Ratio March 31, 2020 Tier 1 leverage $ 1,777,399 10.1 % $ 1,875,239 10.6 % Common equity tier 1 capital 1,777,399 11.4 1,825,239 11.8 Tier 1 risk-based capital 1,777,399 11.4 1,875,239 12.1 Total risk-based capital 2,143,332 13.8 2,050,683 13.2 Minimum requirement: Tier 1 leverage 704,395 4.0 704,633 4.0 Common equity tier 1 capital 698,790 4.5 698,584 4.5 Tier 1 risk-based capital 931,720 6.0 931,445 6.0 Total risk-based capital 1,242,293 8.0 1,241,927 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A 880,791 5.0 Common equity tier 1 capital N/A N/A 1,009,066 6.5 Tier 1 risk-based capital 931,720 6.0 1,241,927 8.0 Total risk-based capital 1,552,866 10.0 1,552,409 10.0 Consolidated Company Bank (In thousands) Amount Ratio Amount Ratio December 31, 2019 Tier 1 leverage $ 1,784,664 10.3 % $ 1,953,008 11.1 % Common equity tier 1 capital 1,784,664 11.5 1,903,008 12.3 Tier 1 risk-based capital 1,784,664 11.5 1,953,008 12.6 Total risk-based capital 2,120,571 13.7 2,099,146 13.6 Minimum requirement: Tier 1 leverage 690,213 4.0 689,881 4.0 Common equity tier 1 capital 697,089 4.5 696,755 4.5 Tier 1 risk-based capital 929,453 6.0 929,007 6.0 Total risk-based capital 1,239,270 8.0 1,238,676 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A 862,351 5.0 Common equity tier 1 capital N/A N/A 1,006,425 6.5 Tier 1 risk-based capital 929,453 6.0 1,238,676 8.0 Total risk-based capital 1,549,088 10.0 1,548,345 10.0

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Summary of Commitments and Contingent Liabilities	(In thousands) March 31, 2020 December 31, 2019 Commitments to extend credit $ 3,985,508 $ 4,667,360 Commitments to grant loans 44,712 292,199 Standby letters of credit 216,267 213,548 Performance letters of credit 23,565 27,985 Commercial letters of credit 20,126 15,587

Disclosure About Fair Values _2

Disclosure About Fair Values of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis	The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis categorized by the level of inputs used in the valuation of each asset at March 31, 2020 and December 31, 2019: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2020 Assets Investment securities available-for-sale $ 2,461,644 $ — $ 2,461,644 $ — Equity securities with readily determinable fair values not held for trading 1,529 1,529 — — Derivative assets 66,333 — 66,333 — Other assets 27,798 — — 27,798 Total recurring basis measured assets $ 2,557,304 $ 1,529 $ 2,527,977 $ 27,798 Liabilities Derivative liabilities $ 19,543 $ — $ 19,543 $ — Total recurring basis measured liabilities $ 19,543 $ — $ 19,543 $ — (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2019 Assets Investment securities available-for-sale $ 2,368,592 $ — $ 2,368,592 $ — Equity securities with readily determinable fair values not held for trading 1,862 1,862 — — Derivative assets 257,137 — 257,137 — Other assets 26,882 — — 26,882 Total recurring basis measured assets $ 2,654,473 $ 1,862 $ 2,625,729 $ 26,882 Liabilities Derivative liabilities $ 11,211 $ — $ 11,211 $ — Total recurring basis measured liabilities $ 11,211 $ — $ 11,211 $ —
Summary of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	Level 3 Assets Measured at Fair Value on a Recurring Basis For the Three Months Ended March 31, 2020 2019 2020 2019 2020 2019 (In thousands) Net Profits Interests Investments in Limited Partnerships SBA Servicing Rights Beginning Balance $ 4,330 $ 5,779 $ 18,742 $ 11,191 $ 3,811 $ — Acquired — — — — — 6,213 Originations — — — — 299 320 Sales proceeds — — — — — — Net gains (losses) included in earnings (259 ) (174 ) (316 ) 746 (168 ) (2,730 ) Reclassifications — — 525 (800 ) — — Contributions paid — — 1,283 608 — — Distributions received — (288 ) (449 ) (144 ) — — Ending Balance $ 4,071 $ 5,317 $ 19,785 $ 11,601 $ 3,942 $ 3,803 Net unrealized (losses) gains included in earnings relating to assets held at the end of the period $ (259 ) $ (174 ) $ (316 ) $ 746 $ (168 ) $ (2,730 ) Net unrealized gains (losses) recognized in other comprehensive income relating to assets held at the end of the period $ — $ — $ — $ — $ — $ —
Summary of Assets Recorded at Fair Value on a Nonrecurring Basis	From time to time, the Company may be required to measure certain other financial assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower of cost or fair value accounting or write-downs of individual assets. For assets measured at fair value on a nonrecurring basis which were still held on the balance sheets at March 31, 2020 and December 31, 2019, the following tables provide the level of valuation assumptions used to determine each adjustment and the related carrying value: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2020 Loans held for sale $ 38,221 $ — $ 38,221 $ — Individually evaluated loans, net of allocated allowance for credit losses (1) 128,519 — — 128,519 Other real estate and repossessed assets 11,608 — — 11,608 Total assets measured on a nonrecurring basis $ 178,348 $ — $ 38,221 $ 140,127 (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2019 Loans held for sale $ 87,649 $ — $ 87,649 $ — Individually evaluated loans, net of allocated allowance for credit losses (1) 101,561 — — 101,561 Other real estate 1,628 — — 1,628 Total assets measured on a nonrecurring basis $ 190,838 $ — $ 87,649 $ 103,189 (1) Prior to the adoption of CECL on January 1, 2020, these loans were known as Impaired loans, net of specific allowance.
Summary of Significant Unobservable Inputs Used in Level 3 Fair Value Measurements for Financial Assets Measured at Fair Value on a Nonrecurring Basis	Significant unobservable inputs used in Level 3 fair value measurements for financial assets measured at fair value on a nonrecurring basis are summarized below: Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range Weighted Average (2) March 31, 2020 Individually evaluated loans, net of allowance for credit losses (3) $ 128,519 Appraised value, as adjusted Discount to fair value 0% - 50% 38% Discounted cash flow Discount rate 3.75%-5.8% 4.7% Enterprise value Comparables and average multiplier 5.0-6.6 X 5.33 X Enterprise value Discount rates and comparables 6.4%-16.0% 12% Net recoverable oil and gas reserves and forward-looking commodity prices Capitalization rate and discount rate 18% 18% Other real estate 1,008 Appraised value, as adjusted Discount to fair value 0% - 20% 10% Estimated closing costs 10% 10% Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range December 31, 2019 Individually evaluated loans, net of allowance for credit losses (3) $ 101,561 Appraised value, as adjusted Discount to fair value 0% - 50% Appraised value, as adjusted Minimum guaranteed proceeds per Settlement Agreement 0% (1) Discounted cash flow Discount rate 5.8% 0% (1) Enterprise value Exit and earnings multiples, discounted cash flows, and market comparables 0% - 46% (1) Other real estate 1,628 Appraised value, as adjusted Discount to fair value 0% - 20% Estimated closing costs 10% (1) Represents difference of remaining balance to fair value. (2) Weighted averages were calculated using the input attribute and the outstanding balance of the loan. (3) Prior to the adoption of CECL on January 1, 2020, these loans were known as Impaired loans, net of specific allowance.
Summary of Estimated Fair Values of Financial Instruments	The estimated fair values of the Company’s financial instruments are as follows: March 31, 2020 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 212,658 $ 212,658 $ 212,658 $ — $ — Interest-bearing deposits in other banks 391,362 391,362 391,362 — — Federal funds sold 5,331 5,331 5,331 — — Investment securities available-for-sale 2,461,644 2,461,644 — 2,461,644 — Equity securities with readily determinable fair values not held for trading 1,529 1,529 1,529 — — Loans held for sale 38,221 38,221 — 38,221 — Net loans 13,146,945 13,030,957 — — 13,030,957 Derivative assets 66,333 66,333 — 66,333 — Other assets 83,225 83,225 — — 83,225 Financial Liabilities: Deposits 14,489,505 14,499,103 — 14,499,103 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,955 51,313 — 51,313 — Subordinated debt 183,032 187,781 — 187,781 — Junior subordinated debentures 37,351 45,728 — 45,728 — Notes payable 2,102 2,102 — 2,102 — Derivative liabilities 19,543 19,543 — 19,543 — December 31, 2019 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 252,447 $ 252,447 $ 252,447 $ — $ — Interest-bearing deposits in other banks 725,343 725,343 725,343 — — Federal funds sold 10,974 10,974 10,974 — — Investment securities available-for-sale 2,368,592 2,368,592 — 2,368,592 — Equity securities with readily determinable fair values not held for trading 1,862 1,862 1,862 — — Loans held for sale 87,649 87,649 — 87,649 — Net loans 12,864,012 12,755,360 — — 12,755,360 Derivative assets 257,137 257,137 — 257,137 — Other assets 72,719 72,719 — — 72,719 Financial Liabilities: Deposits 14,742,794 14,753,192 — 14,753,192 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,938 51,202 — 51,202 — Subordinated debt 182,712 189,386 — 189,386 — Junior subordinated debentures 37,445 48,012 — 48,012 — Notes payable 2,078 2,078 — 2,078 — Derivative liabilities 11,211 11,211 — 11,211 —

Variable Interest Entities an_2

Variable Interest Entities and Other Investments (Tables)	3 Months Ended
	Mar. 31, 2020
Variable Interest Entities And Other Investments [Abstract]
Summary of Investment in Limited Partnerships	The following table presents a summary of the Company’s investments in limited partnerships as of March 31, 2020 and December 31, 2019: (In thousands) March 31, 2020 December 31, 2019 Affordable housing projects (amortized cost) $ 27,635 $ 28,205 Limited partnerships accounted for under the fair value practical expedient of NAV 19,785 18,742 Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method 12,498 8,681 Limited partnerships required to be accounted for under the equity method 8,951 8,951 Total investments in limited partnerships $ 68,869 $ 64,579
Summary of Carrying Amount of Equity Investments Measured Under Measurement Alternative	The carrying amount of equity investments measured under the measurement alternative are as follows: For the Three Months Ended March 31, (In thousands) 2020 2019 Carrying value, Beginning of Year $ 8,681 $ 8,714 Reclassifications (525 ) 800 Distributions (215 ) (42 ) Contributions 300 736 Acquired in Settlement of Loans 4,257 — Carrying value, End of Period $ 12,498 $ 10,208

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Summary of Operating Results of Segments	The following tables present the operating results of the segments as of and for the three months ended March 31, 2020 and 2019: Three Months Ended March 31, 2020 (In thousands) Banking Financial Services Corporate Consolidated Net interest income (expense) $ 157,557 $ (352 ) $ (3,737 ) $ 153,468 Provision for credit losses 83,429 — — 83,429 Noninterest income 25,343 10,208 (482 ) 35,069 Noninterest expense 528,066 8,710 877 537,653 Income tax (benefit) expense (30,922 ) 95 (2,407 ) (33,234 ) Net (loss) income $ (397,673 ) $ 1,051 $ (2,689 ) $ (399,311 ) Total assets $ 17,142,981 $ 90,600 $ 4,337 $ 17,237,918 Three Months Ended March 31, 2019 (In thousands) Banking Financial Services Corporate Consolidated Net interest income (expense) $ 174,396 $ (630 ) $ (4,477 ) $ 169,289 Provision for credit losses 11,210 — — 11,210 Noninterest income 20,087 10,285 292 30,664 Noninterest expense 97,324 7,652 8,464 113,440 Income tax expense (benefit) 19,862 373 (3,133 ) 17,102 Net income (loss) $ 66,087 $ 1,630 $ (9,516 ) $ 58,201 Total assets $ 17,347,134 $ 100,175 $ 5,602 $ 17,452,911

Equity-based Compensation (Tabl

Equity-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Activity Related to Restricted Stock Unit Awards	The following table summarizes the activity related to restricted stock unit awards: For the Three Months Ended March 31, 2020 2019 Number of Shares Weighted Average Fair Value per Unit at Award Date Number of Shares Weighted Average Fair Value per Unit at Award Date Non-vested at beginning of period 1,229,863 $ 19.97 273,354 $ 26.49 Granted during the period — — 645,346 17.87 Vested during the period (160,668 ) 20.55 (44,501 ) 26.50 Forfeited during the period (56,429 ) 20.20 (29,845 ) 19.76 Non-vested at end of period 1,012,766 $ 19.86 844,354 $ 20.14

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	Activity within the balances in accumulated other comprehensive income (loss) is shown in the following tables for the three months ended March 31, 2020 and 2019. Three Months Ended March 31, 2020 (In thousands) Unrealized gains on securities available for sale Unrealized gains on derivative instruments designated as cash flow hedges Unrealized gains on defined benefit pension plans Accumulated other comprehensive income Balance at December 31, 2019 $ 19,605 $ 95,097 $ — $ 114,702 Net change 45,842 120,129 — 165,971 Balance at March 31, 2020 $ 65,447 $ 215,226 $ — $ 280,673 Three Months Ended March 31, 2019 Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Unrealized gains (losses) on defined benefit pension plans Accumulated other comprehensive income (loss) Balance at December 31, 2018 $ (24,279 ) $ (18,305 ) $ (328 ) $ (42,912 ) Net change 22,602 38,171 — 60,773 Balance at March 31, 2019 $ (1,677 ) $ 19,866 $ (328 ) $ 17,861

Summary of Accounting Policie_2

Summary of Accounting Policies - Additional Information (Details) - USD ($)	Jan. 01, 2020	Mar. 31, 2020	Dec. 31, 2019
Significant Of Accounting Policies [Line Items]
Reserve for unfunded commitments, amount		$ 3,200,000	$ 2,000,000
Held to maturity securities		$ 0
Accounting Standards Update 2016-13
Significant Of Accounting Policies [Line Items]
Cumulative effect on retained earnings	$ 62,800,000
Deferred tax asset reclassed amount net	6,100,000
Deferred tax assets	$ 19,500,000

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ in Thousands	Dec. 31, 2019USD ($)BranchLocationshares	Jul. 01, 2019USD ($)	Dec. 31, 2019USD ($)shares	Mar. 31, 2020USD ($)	Sep. 30, 2019USD ($)
Business Acquisition [Line Items]
Goodwill	$ 485,336		$ 485,336	$ 43,061
Unfunded commitments	44,900		44,900	$ 39,700
Banking Segment
Business Acquisition [Line Items]
Goodwill	442,579		442,579
State Bank Financial Corporation
Business Acquisition [Line Items]
Loans added in acquisition	3,317,897		3,317,897
Deposits added in acquisition	$ 4,096,665		4,096,665
Shares issued for business acquisition | shares	49,232,008
Purchase price consideration	$ 826,400
Value of common stock in purchase price	826,113
Fair value of unexercised warrants	267
Goodwill	175,657		175,657
Unfunded commitments	26,800		26,800
Purchase consideration paid	826,380
Recognized provisional identifiable intangible assets with an estimated fair value	$ 117,038		117,038
State Bank Financial Corporation | Certificates of Deposit
Business Acquisition [Line Items]
Estimated useful life	12 months
Discount on transaction of certificates of deposit	$ 3,400
State Bank Financial Corporation | Banking Segment
Business Acquisition [Line Items]
Goodwill	175,700		175,700
State Bank Financial Corporation | Core Deposit
Business Acquisition [Line Items]
Intangible assets recognized	$ 111,900		111,900
Estimated useful life	10 years
State Bank Financial Corporation | Customer Relationship
Business Acquisition [Line Items]
Intangible assets recognized	$ 3,700		3,700
Estimated useful life	10 years
State Bank Financial Corporation | Trademark
Business Acquisition [Line Items]
Intangible assets recognized	$ 1,400		$ 1,400
Estimated useful life	20 years
State Bank Financial Corporation | Common Class A
Business Acquisition [Line Items]
Common stock in exchange for outstanding common shares | shares	1.271		1.271
Shares issued for business acquisition | shares	49,200,000
State Bank Financial Corporation | Georgia
Business Acquisition [Line Items]
Number of branch locations | BranchLocation	32
Wealth & Pension Services Group, Inc. | Linscomb & Williams, Inc.
Business Acquisition [Line Items]
Goodwill		$ 2,600
Purchase consideration paid		8,000
Cash payments		5,200
Future cash payments to acquire certain assets and assume liabilities		$ 2,100
Term of future cash payments		5 years
Recognized provisional identifiable intangible assets with an estimated fair value					$ 5,100
Merger-related expenses			$ 500
Wealth & Pension Services Group, Inc. | Linscomb & Williams, Inc. | Maximum
Business Acquisition [Line Items]
Estimated fair value finalization period		1 year

Business Combinations - Summary

Business Combinations - Summary of Purchase Price Allocation and Consideration Paid (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2019	Mar. 31, 2020
Liabilities
Goodwill	$ 485,336	$ 43,061
State Bank Financial Corporation
Assets
Cash and cash equivalents	414,342
Investment securities available-for-sale	667,865
Loans held for sale	148,469
Loans	3,317,897
Premises and equipment	65,646
Cash surrender value of life insurance	69,252
Intangible assets	117,038
Other assets	47,146
Total assets acquired	4,847,655
Liabilities
Deposits	4,096,665
Short term borrowings	23,899
Other liabilities	76,368
Total liabilities assumed	4,196,932
Net identifiable assets acquired over liabilities assumed	650,723
Goodwill	175,657
Net assets acquired over liabilities assumed	$ 826,380
Consideration:
Cadence Bancorporation common shares issued	49,232,008
Fair value per share of the Company's common stock	$ 16.78
Company common stock issued	$ 826,113
Fair value of unexercised warrants	267
Fair value of total consideration transferred	$ 826,380

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	$ 2,375,637	$ 2,345,791
Securities available-for-sale, Gross Unrealized Gains	87,787	28,270
Securities available-for-sale, Gross Unrealized Losses	1,780	5,469
Securities available-for-sale, Estimated Fair Value	2,461,644	2,368,592
Obligations of U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	70,225	69,464
Securities available-for-sale, Gross Unrealized Gains	221	57
Securities available-for-sale, Gross Unrealized Losses	458	415
Securities available-for-sale, Estimated Fair Value	69,988	69,106
Residential Pass-through | Guaranteed by GNMA
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	99,869	98,122
Securities available-for-sale, Gross Unrealized Gains	2,799	1,205
Securities available-for-sale, Gross Unrealized Losses		245
Securities available-for-sale, Estimated Fair Value	102,668	99,082
Residential Pass-through | Issued by FNMA and FHLMC
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	1,453,735	1,423,771
Securities available-for-sale, Gross Unrealized Gains	52,507	13,128
Securities available-for-sale, Gross Unrealized Losses		1,402
Securities available-for-sale, Estimated Fair Value	1,506,242	1,435,497
Other Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	268,906	292,019
Securities available-for-sale, Gross Unrealized Gains	11,249	4,197
Securities available-for-sale, Gross Unrealized Losses		384
Securities available-for-sale, Estimated Fair Value	280,155	295,832
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	271,590	276,533
Securities available-for-sale, Gross Unrealized Gains	11,580	2,448
Securities available-for-sale, Gross Unrealized Losses	941	3,023
Securities available-for-sale, Estimated Fair Value	282,229	275,958
Total MBS
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	2,094,100	2,090,445
Securities available-for-sale, Gross Unrealized Gains	78,135	20,978
Securities available-for-sale, Gross Unrealized Losses	941	5,054
Securities available-for-sale, Estimated Fair Value	2,171,294	2,106,369
Obligations of States and Municipal Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	211,312	185,882
Securities available-for-sale, Gross Unrealized Gains	9,431	7,235
Securities available-for-sale, Gross Unrealized Losses	381
Securities available-for-sale, Estimated Fair Value	$ 220,362	$ 193,117

Investment Securities - Schedul

Investment Securities - Schedule of Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Mar. 31, 2020USD ($)
Investments Debt And Equity Securities [Abstract]
Available-for-Sale, Due in one year or less, Amortized Cost	$ 1,222
Available-for-Sale, Due after one year through five years, Amortized Cost	1,157
Available-for-Sale, Due after five years through ten years, Amortized Cost	61,915
Available-for-Sale, Due after ten years, Amortized Cost	217,243
Available-for-Sale, Mortgage-backed securities, Amortized Cost	2,094,100
Available-for-Sale, Total, Amortized Cost	2,375,637
Available-for-Sale, Due in one year or less, Estimated Fair Value	1,226
Available-for-Sale, Due after one year through five years, Estimated Fair Value	1,148
Available-for-Sale, Due after five years through ten years, Estimated Fair Value	61,672
Available-for-Sale, Due after ten years, Estimated Fair Value	226,304
Available-for-Sale, Mortgage-backed securities, Estimated Fair Value	2,171,294
Available-for-Sale, Total, Estimated Fair Value	$ 2,461,644

Investment Securities - Additio

Investment Securities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020USD ($)Security	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)
Schedule Of Available For Sale Securities [Line Items]
Other-than-temporary impairment charges	$ 0	$ 0
Percentage of fair value of securities in investment portfolio reflect unrealized loss	6.00%		35.00%
Number of securities in a loss position for more than twelve months | Security	10
Number of securities in a loss position for less than twelve months | Security	17
Allowance for credit losses related to available-for-sale securities	$ 0
Collateral Pledged
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged	$ 728,700,000		$ 629,400,000

Investment Securities - Summa_2

Investment Securities - Summary of Gross Gains, and Gross Losses on Sales of Securities Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]
Gross realized gains	$ 2,994	$ 3
Gross realized losses		(15)
Realized gains (losses), net	$ 2,994	$ (12)

Investment Securities - Sched_2

Investment Securities - Schedule of Securities Classified as Available-for-Sale with Gross Unrealized Losses Aggregated by Category and Length of Time (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	$ 124,122	$ 742,044
Losses less than 12 Months, Gross Unrealized Losses	1,233	4,675
Losses more than 12 Months, Estimated Fair Value	23,039	75,209
Losses more than 12 Months, Gross Unrealized Losses	547	794
Obligations of U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	29,360	33,053
Losses less than 12 Months, Gross Unrealized Losses	278	209
Losses more than 12 Months, Estimated Fair Value	12,896	13,703
Losses more than 12 Months, Gross Unrealized Losses	180	206
MBS
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	72,267	708,991
Losses less than 12 Months, Gross Unrealized Losses	574	4,466
Losses more than 12 Months, Estimated Fair Value	10,143	61,506
Losses more than 12 Months, Gross Unrealized Losses	367	$ 588
Obligations of States and Municipal Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	22,495
Losses less than 12 Months, Gross Unrealized Losses	$ 381

Loans Held for Sale, Loans an_3

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Loans Held for Sale by Portfolio Segment at Lower of Amortized Cost or Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 38,221	$ 87,649
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	33,023	34,767
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	2,913	49,894
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 2,285	$ 2,988

Loans Held for Sale, Loans an_4

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Loans Held for Sale by Portfolio Segment at Lower of Amortized Cost or Fair Value (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 45.3	$ 44.5
Loans Held for Sale
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 0.1	$ 0.4

Loans Held for Sale, Loans an_5

Loans Held for Sale, Loans and Allowance for Credit Losses - Total Loans Outstanding by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 13,392,191	$ 12,983,655	$ 13,710,243
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	7,749,310	7,438,658	7,481,688
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	4,694,114	4,517,016
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,480,497	1,419,957
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,082,602	1,027,421
Commercial and Industrial | Healthcare
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	492,097	474,264
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	2,980,760	2,887,272	2,830,195
Commercial Real Estate | Industrial, Retail, and Other
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,754,881	1,691,694
Commercial Real Estate | Multifamily
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	692,168	659,902
Commercial Real Estate | Office
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	533,711	535,676
Consumer
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	2,662,121	2,657,725	$ 2,639,518
Consumer | Residential
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	2,576,073	2,568,295
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 86,048	$ 89,430

Loans Held for Sale, Loans an_6

Loans Held for Sale, Loans and Allowance for Credit Losses - Total Loans Outstanding by Portfolio Segment and Class of Financing Receivable (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 45.3	$ 44.5
Loans And Leases Receivable Gross Carrying Amount
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 45.3	$ 44.5

Loans Held for Sale, Loans an_7

Loans Held for Sale, Loans and Allowance for Credit Losses - Additional Information (Details)	Jan. 01, 2020USD ($)	Mar. 31, 2020USD ($)TDR	Jun. 30, 2019USD ($)	Mar. 31, 2019TDR	Dec. 31, 2019USD ($)
Accounts Notes And Loans Receivable [Line Items]
Description policy review		two times per year
Relationships amount			$ 5,000,000
Loans amount			$ 5,000,000
Allowance for Credit Losses	$ 75,900,000	$ 82,200,000
Collateral loans impaired		$ 147,600,000
Number of TDRs | TDR		0		0
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Foreclosed residential properties		$ 97,000			$ 151,000
Residential Real Estate | Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Residential mortgage loans in process of foreclosure		0			$ 4,400,000
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Charge-offs related loans modified into TDRs		6,800,000
Customer Concentration | Accounts Receivable | Minimum
Accounts Notes And Loans Receivable [Line Items]
Consumer purpose loan risk		2,500,000
Customer Concentration | Accounts Receivable | Minimum | Criticized
Accounts Notes And Loans Receivable [Line Items]
Consumer purpose loan risk		2,500,000
Customer Concentration | Accounts Receivable | Minimum | NSC
Accounts Notes And Loans Receivable [Line Items]
Consumer purpose loan risk		10,000,000
Customer Concentration | Accounts Receivable | Maximum
Accounts Notes And Loans Receivable [Line Items]
Consumer purpose loan risk		$ 10,000,000

Loans Held for Sale, Loans an_8

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	$ 119,643	$ 94,378
Provision for credit losses	82,238	11,210
Charge-offs	(33,098)	(938)
Recoveries	613	388
Balance at end of period	245,246	105,038
Allowance for credit losses, collectively evaluated for impairment	226,147	90,401
Allowance for credit losses, individually evaluated for impairment	19,099	14,637
Loans collectively evaluated	13,244,573	13,608,304
Loans individually evaluated	147,618	101,939
Loans ending balance	13,392,191	13,710,243	$ 12,983,655
Accounting Standards Update 2016-13
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	195,493
Cumulative effect of adoption of CECL	75,850
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	89,796	66,316
Provision for credit losses	63,684	9,299
Charge-offs	(31,987)	(461)
Recoveries	141	372
Balance at end of period	154,585	75,526
Allowance for credit losses, collectively evaluated for impairment	135,486	61,020
Allowance for credit losses, individually evaluated for impairment	19,099	14,506
Loans collectively evaluated	7,609,527	7,389,053
Loans individually evaluated	139,783	92,635
Loans ending balance	7,749,310	7,481,688	7,438,658
Commercial and Industrial | Accounting Standards Update 2016-13
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	122,747
Cumulative effect of adoption of CECL	32,951
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	15,319	10,452
Provision for credit losses	17,798	102
Charge-offs	(478)	(85)
Recoveries	180
Balance at end of period	53,418	10,469
Allowance for credit losses, collectively evaluated for impairment	53,418	10,462
Allowance for credit losses, individually evaluated for impairment		7
Loans collectively evaluated	2,975,416	2,823,249
Loans individually evaluated	5,344	6,946
Loans ending balance	2,980,760	2,830,195	2,887,272
Commercial Real Estate | Accounting Standards Update 2016-13
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	35,918
Cumulative effect of adoption of CECL	20,599
Consumer
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	14,528	13,703
Provision for credit losses	756	1,206
Charge-offs	(633)	(234)
Recoveries	292	15
Balance at end of period	37,243	14,690
Allowance for credit losses, collectively evaluated for impairment	37,243	14,625
Allowance for credit losses, individually evaluated for impairment		65
Loans collectively evaluated	2,659,630	2,637,416
Loans individually evaluated	2,491	2,102
Loans ending balance	2,662,121	2,639,518	$ 2,657,725
Consumer | Accounting Standards Update 2016-13
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	36,828
Cumulative effect of adoption of CECL	22,300
Small Business Portfolio Segment
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		3,907
Provision for credit losses		603
Charge-offs		(158)
Recoveries		1
Balance at end of period		4,353
Allowance for credit losses, collectively evaluated for impairment		4,294
Allowance for credit losses, individually evaluated for impairment		59
Loans collectively evaluated		758,586
Loans individually evaluated		256
Loans ending balance		$ 758,842
Reserve for Unfunded Commitments
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	1,699
Provision for credit losses	1,191
Balance at end of period	3,222
Reserve for Unfunded Commitments | Accounting Standards Update 2016-13
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	2,031
Cumulative effect of adoption of CECL	332
After Reserve For Unfunded Commitments
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	121,342
Provision for credit losses	83,429
Charge-offs	(33,098)
Recoveries	613
Balance at end of period	248,468
After Reserve For Unfunded Commitments | Accounting Standards Update 2016-13
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	197,524
Cumulative effect of adoption of CECL	$ 76,182

Loans Held for Sale, Loans an_9

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Accrued interest receivable	$ 45.3	$ 44.5

Loans Held for Sale, Loans a_10

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Credit Quality Indicator And by Origination Year (Details) $ in Thousands	Mar. 31, 2020USD ($)
Financing Receivable Recorded Investment [Line Items]
2020	$ 365,050
2019	1,692,792
2018	2,721,950
2017	1,826,052
2016	1,080,100
2015 and Prior	1,921,595
Revolving Loans	3,784,652
Total	13,392,191
Commercial Portfolio Segment
Financing Receivable Recorded Investment [Line Items]
2020	175,477
2019	812,411
2018	1,305,789
2017	774,788
2016	472,159
2015 and Prior	821,024
Revolving Loans	3,387,662
Total	7,749,310
Commercial Portfolio Segment | Pass
Financing Receivable Recorded Investment [Line Items]
2020	174,633
2019	796,988
2018	1,155,772
2017	713,223
2016	397,273
2015 and Prior	738,601
Revolving Loans	3,179,764
Total	7,156,254
Commercial Portfolio Segment | Special mention
Financing Receivable Recorded Investment [Line Items]
2020	261
2019	7,690
2018	69,934
2017	34,365
2016	39,415
2015 and Prior	16,712
Revolving Loans	86,730
Total	255,107
Commercial Portfolio Segment | Substandard
Financing Receivable Recorded Investment [Line Items]
2020	583
2019	5,949
2018	76,623
2017	26,435
2016	35,471
2015 and Prior	58,585
Revolving Loans	114,862
Total	318,508
Commercial Portfolio Segment | Doubtful
Financing Receivable Recorded Investment [Line Items]
2019	1,784
2018	3,460
2017	765
2015 and Prior	7,126
Revolving Loans	6,306
Total	19,441
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
2020	110,565
2019	406,781
2018	762,387
2017	694,378
2016	282,714
2015 and Prior	581,749
Revolving Loans	142,186
Total	2,980,760
Commercial Real Estate | Pass
Financing Receivable Recorded Investment [Line Items]
2020	109,070
2019	406,225
2018	737,092
2017	692,826
2016	274,966
2015 and Prior	562,834
Revolving Loans	141,895
Total	2,924,908
Commercial Real Estate | Special mention
Financing Receivable Recorded Investment [Line Items]
2020	1,495
2019	346
2018	25,125
2017	945
2016	293
2015 and Prior	3,221
Revolving Loans	279
Total	31,704
Commercial Real Estate | Substandard
Financing Receivable Recorded Investment [Line Items]
2019	210
2018	170
2017	607
2016	7,455
2015 and Prior	15,694
Revolving Loans	12
Total	24,148
Consumer
Financing Receivable Recorded Investment [Line Items]
2020	79,008
2019	473,600
2018	653,774
2017	356,886
2016	325,227
2015 and Prior	518,822
Revolving Loans	254,804
Total	2,662,121
Consumer | Current
Financing Receivable Recorded Investment [Line Items]
2020	79,008
2019	471,638
2018	646,405
2017	356,462
2016	320,817
2015 and Prior	504,905
Revolving Loans	252,225
Total	2,631,460
Consumer | 30-59 days past due
Financing Receivable Recorded Investment [Line Items]
2019	1,506
2018	4,076
2017	340
2016	1,795
2015 and Prior	7,443
Revolving Loans	2,358
Total	17,518
Consumer | 60-89 days past due
Financing Receivable Recorded Investment [Line Items]
2019	309
2018	1,134
2017	76
2016	1,075
2015 and Prior	1,494
Revolving Loans	221
Total	4,309
Consumer | 90+ days past due
Financing Receivable Recorded Investment [Line Items]
2019	147
2018	2,159
2017	8
2016	1,540
2015 and Prior	4,980
Total	$ 8,834

Loans Held for Sale, Loans a_11

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Credit Quality Indicator And by Origination Year (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Accrued interest receivable	$ 45.3	$ 44.5

Loans Held for Sale, Loans a_12

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Aging of Past Due Loans By Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	$ 91,971	$ 92,671
Current	13,300,220	12,890,984
Total	13,392,191	12,983,655
90+ Days Past Due and Accruing	1,999	1,120
30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	27,306	37,625
60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	14,840	8,713
90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	49,825	46,333
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	54,317	62,814
Current	7,694,993	7,375,844
Total	7,749,310	7,438,658
90+ Days Past Due and Accruing	37	193
Commercial and Industrial | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	6,975	24,859
Commercial and Industrial | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	9,259	2,442
Commercial and Industrial | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	38,083	35,513
Commercial and Industrial | General C&I
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	34,642	39,443
Current	4,659,472	4,477,573
Total	4,694,114	4,517,016
90+ Days Past Due and Accruing	13	85
Commercial and Industrial | General C&I | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	4,903	23,143
Commercial and Industrial | General C&I | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	794	1,117
Commercial and Industrial | General C&I | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	28,945	15,183
Commercial and Industrial | Energy Sector
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans		8,166
Current	1,480,497	1,411,791
Total	1,480,497	1,419,957
Commercial and Industrial | Energy Sector | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans		8,166
Commercial and Industrial | Restaurant Industry
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	15,918	10,524
Current	1,066,684	1,016,897
Total	1,082,602	1,027,421
90+ Days Past Due and Accruing	24	108
Commercial and Industrial | Restaurant Industry | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	871	1,219
Commercial and Industrial | Restaurant Industry | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	8,413	1,284
Commercial and Industrial | Restaurant Industry | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	6,634	8,021
Commercial and Industrial | Healthcare
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	3,757	4,681
Current	488,340	469,583
Total	492,097	474,264
Commercial and Industrial | Healthcare | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,201	497
Commercial and Industrial | Healthcare | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	52	41
Commercial and Industrial | Healthcare | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	2,504	4,143
Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	6,993	7,214
Current	2,973,767	2,880,058
Total	2,980,760	2,887,272
90+ Days Past Due and Accruing	2
Commercial Real Estate | Industrial, retail, and other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	5,530	5,742
Current	1,749,350	1,685,952
Total	1,754,880	1,691,694
90+ Days Past Due and Accruing	2
Commercial Real Estate | Multifamily
Financing Receivable Recorded Investment Past Due [Line Items]
Current	692,169	659,902
Total	692,169	659,902
Commercial Real Estate | Office
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,463	1,472
Current	532,248	534,204
Total	533,711	535,676
Commercial Real Estate | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	2,813	3,607
Commercial Real Estate | 30-59 days past due | Industrial, retail, and other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	2,486	3,354
Commercial Real Estate | 30-59 days past due | Office
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	327	253
Commercial Real Estate | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,272	133
Commercial Real Estate | 60-89 days past due | Industrial, retail, and other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,272	133
Commercial Real Estate | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	2,908	3,474
Commercial Real Estate | 90+ days past due | Industrial, retail, and other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,772	2,255
Commercial Real Estate | 90+ days past due | Office
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,136	1,219
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	30,661	22,643
Current	2,631,460	2,635,082
Total	2,662,121	2,657,725
90+ Days Past Due and Accruing	1,960	927
Consumer | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	30,434	22,360
Current	2,545,640	2,545,935
Total	2,576,074	2,568,295
90+ Days Past Due and Accruing	1,960	887
Consumer | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	227	283
Current	85,820	89,147
Total	86,047	89,430
90+ Days Past Due and Accruing		40
Consumer | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	17,518	9,159
Consumer | 30-59 days past due | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	17,325	8,967
Consumer | 30-59 days past due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	193	192
Consumer | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	4,309	6,138
Consumer | 60-89 days past due | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	4,283	6,101
Consumer | 60-89 days past due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	26	37
Consumer | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	8,834	7,346
Consumer | 90+ days past due | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	8,826	7,292
Consumer | 90+ days past due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	$ 8	$ 54

Loans Held for Sale, Loans a_13

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Aging of Past Due Loans By Segment and Class of Financing Receivable (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Accrued interest receivable	$ 45.3	$ 44.5

Loans Held for Sale, Loans a_14

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Nonaccruing Loans by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	$ 156,778
Nonaccrual Loans - Amortized Cost, End of the Period	159,653
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	41,725
90+ Days Past Due and Accruing	1,999	$ 1,120
Interest Income Recognized	112
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	134,473
Nonaccrual Loans - Amortized Cost, End of the Period	137,302
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	33,889
90+ Days Past Due and Accruing	37	193
Interest Income Recognized	37
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	66,589
Nonaccrual Loans - Amortized Cost, End of the Period	62,517
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	11,580
90+ Days Past Due and Accruing	13	85
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	9,568
Nonaccrual Loans - Amortized Cost, End of the Period	19,171
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	1,137
Interest Income Recognized	8
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	53,483
Nonaccrual Loans - Amortized Cost, End of the Period	52,603
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	19,220
90+ Days Past Due and Accruing	24	108
Interest Income Recognized	29
Commercial and Industrial | Healthcare
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	4,833
Nonaccrual Loans - Amortized Cost, End of the Period	3,011
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	1,952
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	7,180
Nonaccrual Loans - Amortized Cost, End of the Period	7,544
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	5,345
90+ Days Past Due and Accruing	2
Interest Income Recognized	43
Commercial Real Estate | Industrial, Retail, and Other
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	5,935
Nonaccrual Loans - Amortized Cost, End of the Period	6,385
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	4,301
90+ Days Past Due and Accruing	2
Interest Income Recognized	43
Commercial Real Estate | Office
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	1,245
Nonaccrual Loans - Amortized Cost, End of the Period	1,159
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	1,044
Consumer
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	15,125
Nonaccrual Loans - Amortized Cost, End of the Period	14,807
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	2,491
90+ Days Past Due and Accruing	1,960	927
Interest Income Recognized	32
Consumer | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	15,101
Nonaccrual Loans - Amortized Cost, End of the Period	14,799
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	2,491
90+ Days Past Due and Accruing	1,960	$ 887
Interest Income Recognized	30
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, Beginning of the Period	24
Nonaccrual Loans - Amortized Cost, End of the Period	8
Interest Income Recognized	$ 2

Loans Held for Sale, Loans a_15

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Nonaccruing Loans by Portfolio Segment and Class of Financing Receivable (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
ACI loans reclassed to nonaccrual loans	$ 159,653	$ 156,778
Accrued interest receivable	$ 45,300	44,500
Accounting Standards Update 2016-13
Accounts Notes And Loans Receivable [Line Items]
ACI loans reclassed to nonaccrual loans		$ 43,000

Loans Held for Sale, Loans a_16

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Loan that were Modified Into TDRs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)TDR	Mar. 31, 2019USD ($)TDR
Financing Receivable Modifications [Line Items]
Number of TDRs | TDR	7	1
Amortized Cost | $	$ 65,691	$ 24,369
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Number of TDRs | TDR	7	1
Amortized Cost | $	$ 65,691	$ 24,369

Loans Held for Sale, Loans a_17

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Loan that were Modified Into TDRs (Parenthetical) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable Modifications [Line Items]
Accrued interest receivable	$ 45,300,000	$ 44,500,000
Maximum
Financing Receivable Modifications [Line Items]
Accrued interest receivable	$ 100,000

Loans Held for Sale, Loans a_18

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Types of Loan Modifications that were Modified into TDRs (Details) - TDR	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable Modifications [Line Items]
Number of Loans Modified	7	1
Rate Concession
Financing Receivable Modifications [Line Items]
Number of Loans Modified	1
Modified Terms and/or Other Concessions
Financing Receivable Modifications [Line Items]
Number of Loans Modified	6	1
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Number of Loans Modified	7	1
Commercial and Industrial | Rate Concession
Financing Receivable Modifications [Line Items]
Number of Loans Modified	1
Commercial and Industrial | Modified Terms and/or Other Concessions
Financing Receivable Modifications [Line Items]
Number of Loans Modified	6	1

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 43,061	$ 485,336
Other intangible assets, net	99,721	105,613
Total goodwill and intangible assets, net	142,782	590,949
Core Deposit
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	85,829	90,788
Customer Lists
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	11,369	11,993
Noncompete Agreements
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	1,184	1,473
Trademarks
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	$ 1,339	$ 1,359

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Core Deposit
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	$ 65,793	$ 60,836
Customer Lists
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	22,488	21,908
Noncompete Agreements
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	172	137
Trademarks
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	$ 95	$ 75

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill And Other Intangible Assets [Line Items]
Interim goodwill impairment	$ 443,695
Goodwill	43,061	$ 485,336
State Bank Acquisition
Goodwill And Other Intangible Assets [Line Items]
Increased in goodwill related to acquisition	1,100
Wealth & Pension Services Group, Inc.
Goodwill And Other Intangible Assets [Line Items]
Increased in goodwill related to acquisition	$ 300

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Summary of Changes to Carrying Amount of Goodwill by Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Goodwill And Other Intangible Assets [Line Items]
Balance as of December 31, 2019	$ 485,336
Impairment	(443,695)
Balance as of March 31, 2020	43,061
Wealth & Pension Acquisition
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	304
Other
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	1,116
Banking
Goodwill And Other Intangible Assets [Line Items]
Balance as of December 31, 2019	442,579
Impairment	(443,695)
Banking | Other
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	1,116
Financial Services
Goodwill And Other Intangible Assets [Line Items]
Balance as of December 31, 2019	42,757
Balance as of March 31, 2020	43,061
Financial Services | Wealth & Pension Acquisition
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	$ 304

Derivatives - Schedule of Notio

Derivatives - Schedule of Notional Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Feb. 28, 2019
Derivatives Fair Value [Line Items]
Notional Amount	$ 2,517,457	$ 6,339,935
Fair Value, Other Assets	66,333	257,137
Fair Value, Other Liabilities	19,543	11,211
Cash Flow Hedges
Derivatives Fair Value [Line Items]
Notional Amount			$ 4,000,000
Derivatives Designated as Hedging Instruments | Cash Flow Hedges
Derivatives Fair Value [Line Items]
Notional Amount	350,000	4,350,000
Fair Value, Other Assets	23,497	239,213
Fair Value, Other Liabilities		643
Derivatives Designated as Hedging Instruments | Cash Flow Hedges | Commercial Loans | Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional Amount	350,000	350,000
Fair Value, Other Assets	23,497
Fair Value, Other Liabilities		643
Derivatives Designated as Hedging Instruments | Cash Flow Hedges | Commercial Loans | Interest Rate Collars
Derivatives Fair Value [Line Items]
Notional Amount		4,000,000
Fair Value, Other Assets		239,213
Derivatives Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Notional Amount	2,167,457	1,989,935
Fair Value, Other Assets	42,836	17,924
Fair Value, Other Liabilities	19,543	10,568
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Interest Rate Lock Commitments
Derivatives Fair Value [Line Items]
Notional Amount	21,350	4,138
Fair Value, Other Assets	333	22
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Floating Commitments
Derivatives Fair Value [Line Items]
Notional Amount	7,732	1,523
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Notional Amount	73,937	74,322
Fair Value, Other Assets	1,614	379
Fair Value, Other Liabilities	1,208	558
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional Amount	1,203,681	1,008,805
Fair Value, Other Assets	24,533	8,386
Fair Value, Other Liabilities	1,956	899
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Collars
Derivatives Fair Value [Line Items]
Notional Amount	73,332	75,555
Fair Value, Other Assets	711	257
Fair Value, Other Liabilities	711	257
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Caps
Derivatives Fair Value [Line Items]
Notional Amount	171,470	167,185
Fair Value, Other Assets	11	18
Fair Value, Other Liabilities	11	18
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Floors
Derivatives Fair Value [Line Items]
Notional Amount	613,250	654,298
Fair Value, Other Assets	15,634	8,836
Fair Value, Other Liabilities	15,634	8,836
Derivatives Not Designated as Hedging Instruments | Forward Contracts | Mortgage Loan Forward Sale Commitments
Derivatives Fair Value [Line Items]
Notional Amount	2,705	4,109
Fair Value, Other Assets		$ 26
Fair Value, Other Liabilities	$ 23

Derivatives - Additional Inform

Derivatives - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2020	Feb. 28, 2019	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Obligation to return cash collateral provided by counterparty	$ 19,100		$ 19,100
Derivative, notional amount	$ 2,517,457		2,517,457	$ 6,339,935
Deferred net gains (loss) on derivatives			$ (76,100)
Cash Flow Hedges
Derivative [Line Items]
Derivative, notional amount		$ 4,000,000
Derivative contract term		5 years
Derivative contract remaining maturity	4 years
Amortization period of gain reflected in other comprehensive income net of deferred income taxes	4 years
Realized gain on termination of cash flow hedges collar	$ 261,200
Maximum period for hedging transactions			5 years 10 months 24 days
LIBOR | Cash Flow Hedges
Derivative [Line Items]
Derivative fixed rate	0.5785%		0.5785%
Interest-bearing Deposits in Banks
Derivative [Line Items]
Cash or securities pledged as collateral	$ 13,200		$ 13,200	$ 10,600

Derivatives - Schedule of Gain

Derivatives - Schedule of Gain (Loss) in Consolidated Statements of Income Related to Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments Gain Loss [Line Items]
Noninterest income	$ (76,100)
Derivatives Designated as Hedging Instruments | Cash Flow Hedges | Commercial Loans | Interest Rate Swaps
Derivative Instruments Gain Loss [Line Items]
OCI	24,035	$ 6,656
Reclassified from AOCI to interest income	(106)	(1,508)
Derivatives Designated as Hedging Instruments | Cash Flow Hedges | Commercial Loans | Interest Rate Collars
Derivative Instruments Gain Loss [Line Items]
OCI	143,198	41,477
Reclassified from AOCI to interest income	8,213
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Interest Rate Lock Commitments
Derivative Instruments Gain Loss [Line Items]
Noninterest income	311	69
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivative Instruments Gain Loss [Line Items]
Noninterest income	$ 865	$ 1,140

Derivative - Schedule of Intere

Derivative - Schedule of Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional Amount	$ 2,517,457	$ 6,339,935
1.5995% Interest Rate Swap
Derivative [Line Items]
Effective Date	Mar. 8, 2016
Maturity Date	Feb. 27, 2026
Notional Amount	$ 175,000
Fixed Rate	1.5995%
Variable Rate	1 Month LIBOR
1.5890% Interest Rate Swap
Derivative [Line Items]
Effective Date	Mar. 8, 2016
Maturity Date	Feb. 27, 2026
Notional Amount	$ 175,000
Fixed Rate	1.589%
Variable Rate	1 Month LIBOR

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Domestic
Time Deposits [Line Items]
Time deposits $250,000 and over	$ 607,100,000	$ 644,100,000
Foreign
Time Deposits [Line Items]
Time Deposits	$ 0	$ 0

Borrowed Funds - Additional Inf

Borrowed Funds - Additional Information (Details) - USD ($)	Mar. 29, 2020	Jun. 30, 2019	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2020	Dec. 31, 2019	Mar. 29, 2019
Borrowed Funds [Line Items]
Unregistered multi tranche debt Transactions				$ 245,000,000
Unregistered debt transactions			$ 50,000,000
Subordinated debt					$ 183,032,000	$ 182,712,000
Subordinate debt capital treatment achievement period					10 years
FHLB advances					$ 100,000,000	100,000,000
FHLB borrowing availability					1,300,000,000
Irrevocable letter of credit					566,000,000	391,000,000
Notes payable					$ 2,102,000	2,078,000
Holding Company Revolving Loan Facility | Revolving Credit Facility
Borrowed Funds [Line Items]
Debt instrument, maturity date	Mar. 29, 2021				Mar. 29, 2020
Borrowings					$ 0
Line of credit facility, borrowing capacity							$ 100,000,000
Linscomb & Williams, Inc. | Wealth & Pension Services Group, Inc.
Borrowed Funds [Line Items]
Notes payable					2,100,000
FRB
Borrowed Funds [Line Items]
Borrowings					0	$ 0
Public Fund Treasury Management Deposit
Borrowed Funds [Line Items]
Variable letter of credit					$ 500,000,000
Municipal Deposits
Borrowed Funds [Line Items]
Letter of credit expiration date					Jul. 20, 2020
Commercial Loans | FRB
Borrowed Funds [Line Items]
Collateralized borrowings from FRB					$ 805,700,000
Commercial and Residential Real Estate Loan
Borrowed Funds [Line Items]
FHLB advances collateral amount					$ 1,900,000,000
4.75% Fixed to Floating Rate Subordinated Notes Due 2029
Borrowed Funds [Line Items]
Aggregate principle amount		$ 85,000,000
Debt instrument, interest rate		4.75%
4.875% Senior Notes, Due June 28, 2019
Borrowed Funds [Line Items]
Debt instrument, interest rate		4.875%
Debt instrument, maturity date					Jun. 28, 2019
Subordinated debt maturity period					4 years
5.375% Senior Notes, Due June 28, 2021
Borrowed Funds [Line Items]
Debt instrument, interest rate					5.375%	5.375%
Debt instrument, maturity date					Jun. 28, 2021	Jun. 28, 2021
Subordinated debt maturity period					7 years
7.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Borrowed Funds [Line Items]
Debt instrument, interest rate					7.25%	7.25%
Debt instrument, maturity date					Jun. 28, 2029	Jun. 28, 2029
Subordinated debt maturity period					15 years
Subordinated debt					$ 35,000,000
Call option period					10 years
6.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Borrowed Funds [Line Items]
Debt instrument, interest rate					6.25%	6.25%
Debt instrument, maturity date					Jun. 28, 2029	Jun. 28, 2029
Subordinated debt maturity period					15 years
Subordinated debt					$ 25,000,000
Call option period					10 years
4.750% Subordinated Notes, Due June 2029, Callable in 2024
Borrowed Funds [Line Items]
Debt instrument, interest rate					4.75%	4.75%
Debt instrument, maturity date					Jun. 30, 2029	Jun. 30, 2029
Subordinated debt maturity period					10 years
Subordinated debt					$ 85,000,000
Call option period					5 years
6.500% Subordinated Notes, Due March 2025, Callable in 2020
Borrowed Funds [Line Items]
Debt instrument, interest rate					6.50%	6.50%
Debt instrument, maturity date					Mar. 31, 2025	Mar. 31, 2025
Subordinated debt					$ 40,000,000
Call option period					5 years
Expiration on June 02, 2020 | Harris County Deposits
Borrowed Funds [Line Items]
Irrevocable letter of credit					$ 60,000,000
Letter of credit expiration date					Jun. 2, 2020
Expiration on April 16, 2020 | Public Fund Treasury Management Deposit
Borrowed Funds [Line Items]
Letter of credit expiration date					Apr. 16, 2020
Letter of credit expiration period					45 days
Letter of credit extended expiration term					1 year
Letter of Credit | Municipal Deposits
Borrowed Funds [Line Items]
Borrowings					$ 6,000,000

Borrowed Funds - Summary of Deb

Borrowed Funds - Summary of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt issue costs and unamortized premium	$ (2,013)	$ (2,350)
Total senior and subordinated debt	232,987	232,650
Cadence Bancorporation
Debt Instrument [Line Items]
Long-term debt, gross	210,000	210,000
Cadence Bancorporation | 5.375% Senior Notes, Due June 28, 2021
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Cadence Bancorporation | 7.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Debt Instrument [Line Items]
Long-term debt, gross	35,000	35,000
Cadence Bancorporation | 6.500% Subordinated Notes, Due March 2025, Callable in 2020
Debt Instrument [Line Items]
Long-term debt, gross	40,000	40,000
Cadence Bancorporation | 4.750% Subordinated Notes, Due June 2029, Callable in 2024
Debt Instrument [Line Items]
Long-term debt, gross	85,000	85,000
Cadence Bank | 6.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 25,000	$ 25,000

Borrowed Funds - Summary of D_2

Borrowed Funds - Summary of Debt (Parenthetical) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
5.375% Senior Notes, Due June 28, 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	5.375%	5.375%
Debt instrument, maturity date	Jun. 28, 2021	Jun. 28, 2021
7.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	7.25%	7.25%
Debt instrument, maturity date	Jun. 28, 2029	Jun. 28, 2029
6.500% Subordinated Notes, Due March 2025, Callable in 2020
Debt Instrument [Line Items]
Debt instrument, interest rate	6.50%	6.50%
Debt instrument, maturity date	Mar. 31, 2025	Mar. 31, 2025
4.750% Subordinated Notes, Due June 2029, Callable in 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	4.75%	4.75%
Debt instrument, maturity date	Jun. 30, 2029	Jun. 30, 2029
6.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	6.25%	6.25%
Debt instrument, maturity date	Jun. 28, 2029	Jun. 28, 2029

Borrowed Funds - Summary of Jun

Borrowed Funds - Summary of Junior Subordinated Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Junior subordinated debentures, gross	$ 50,619	$ 50,619
Purchase accounting adjustment, net of amortization	(13,268)	(13,174)
Total junior subordinated debentures	37,351	37,445
3 month LIBOR plus 2.85%, due 2033
Debt Instrument [Line Items]
Junior subordinated debentures, gross	30,000	30,000
3 month LIBOR plus 2.95%, due 2033
Debt Instrument [Line Items]
Junior subordinated debentures, gross	5,155	5,155
3 month LIBOR plus 1.75%, due 2037
Debt Instrument [Line Items]
Junior subordinated debentures, gross	$ 15,464	$ 15,464

Borrowed Funds - Summary of J_2

Borrowed Funds - Summary of Junior Subordinated Debt (Parenthetical) (Details) - Junior subordinated debt	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
3 month LIBOR plus 2.85%, due 2033
Debt Instrument [Line Items]
Debt instrument, interest rate	2.85%	2.85%
Debt instrument maturity year	2033	2033
3 month LIBOR plus 2.95%, due 2033
Debt Instrument [Line Items]
Debt instrument, interest rate	2.95%	2.95%
Debt instrument maturity year	2033	2033
3 month LIBOR plus 1.75%, due 2037
Debt Instrument [Line Items]
Debt instrument, interest rate	1.75%	1.75%
Debt instrument maturity year	2037	2037

Other Noninterest Income and _3

Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other noninterest income
Insurance revenue	$ 249	$ 198
Mortgage banking income	1,111	579
Income from bank owned life insurance policies	1,328	1,152
Other	(577)	1,585
Total other noninterest income	2,111	3,514
Other noninterest expenses
Data processing expense	3,352	2,594
Software amortization	3,547	3,335
Consulting and professional fees	2,707	2,229
Loan related expenses	760	910
FDIC insurance	2,436	1,752
Communications	1,156	998
Advertising and public relations	1,464	781
Legal expenses	411	158
Other	11,636	8,181
Total other noninterest expenses	$ 27,469	$ 20,938

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (33,234)	$ 17,102
Effective tax rate	7.70%	22.70%
Net deferred tax liability			$ 24,982
Net deferred tax asset	$ 40,303

Earnings Per Common Share - Rec

Earnings Per Common Share - Reconciliation of Basic and Diluted Net (Loss) Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net (loss) income per consolidated statements of operations	$ (399,311)	$ 58,201
Net income allocated to participating securities		(173)
Net (loss) income allocated to common stock	$ (399,311)	$ 58,028
Weighted average common shares outstanding (Basic)	126,630,446	130,485,521
Weighted average dilutive restricted stock units and warrants		63,798
Weighted average common shares outstanding (Diluted)	126,630,446	130,549,319
(Loss) earnings per common share (Basic)	$ (3.15)	$ 0.44
(Loss) earnings per common share (Diluted)	$ (3.15)	$ 0.44

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stock Options and Restricted Stock Units
Earnings Per Share [Line Items]
Antidilutive stock options and restricted stock units	$ 2,512,524	$ 1,848,496

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 26, 2020	Dec. 31, 2019
Banking And Thrift [Abstract]
Describes the potential impact of COVID-19	On March 27, 2020, the federal banking agencies issued an interim final rule to delay the estimated impact on regulatory capital stemming from the adoption of CECL. The agencies granted this relief to allow institutions to focus on lending to customers in light of recent strains on the U.S economy due to COVID-19, while also maintaining the quality of regulatory capital. Under the interim final rule, 100% of the CECL Day 1 impact and 25% of subsequent provisions for credit losses (“Day 2” impacts) will be deferred over a two-year year period ending January 1, 2022, at which time it this deferred amount will be phased in on a pro rata basis over a three-year period ending January 2025.
Cash on hand	$ 137.3
Reserve requirement with FRB	$ 0		$ 246
Reserve requirement ratio with FRB		0.00%

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 leverage	$ 1,777,399	$ 1,784,664
Common equity tier 1 capital	1,777,399	1,784,664
Tier 1 risk-based capital	1,777,399	1,784,664
Total risk-based capital	2,143,332	2,120,571
Tier 1 leverage	704,395	690,213
Common equity tier 1 capital	698,790	697,089
Tier 1 risk-based capital	931,720	929,453
Total risk-based capital	1,242,293	1,239,270
Tier 1 risk-based capital	931,720	929,453
Total risk-based capital	$ 1,552,866	$ 1,549,088
Tier 1 leverage	10.10%	10.30%
Common equity tier 1 capital	11.40%	11.50%
Tier 1 risk-based capital	11.40%	11.50%
Total risk-based capital	13.80%	13.70%
Tier 1 leverage	4.00%	4.00%
Common equity tier 1 capital	4.50%	4.50%
Tier 1 risk-based capital	6.00%	6.00%
Total risk-based capital	8.00%	8.00%
Tier 1 risk-based capital	6.00%	6.00%
Total risk-based capital	10.00%	10.00%
Cadence Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 leverage	$ 1,875,239	$ 1,953,008
Common equity tier 1 capital	1,825,239	1,903,008
Tier 1 risk-based capital	1,875,239	1,953,008
Total risk-based capital	2,050,683	2,099,146
Tier 1 leverage	704,633	689,881
Common equity tier 1 capital	698,584	696,755
Tier 1 risk-based capital	931,445	929,007
Total risk-based capital	1,241,927	1,238,676
Tier 1 leverage	880,791	862,351
Common equity tier 1 capital	1,009,066	1,006,425
Tier 1 risk-based capital	1,241,927	1,238,676
Total risk-based capital	$ 1,552,409	$ 1,548,345
Tier 1 leverage	10.60%	11.10%
Common equity tier 1 capital	11.80%	12.30%
Tier 1 risk-based capital	12.10%	12.60%
Total risk-based capital	13.20%	13.60%
Tier 1 leverage	4.00%	4.00%
Common equity tier 1 capital	4.50%	4.50%
Tier 1 risk-based capital	6.00%	6.00%
Total risk-based capital	8.00%	8.00%
Tier 1 leverage	5.00%	5.00%
Common equity tier 1 capital	6.50%	6.50%
Tier 1 risk-based capital	8.00%	8.00%
Total risk-based capital	10.00%	10.00%

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Unfunded commitments - LLC Investments	$ 39.7	$ 44.9

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Summary of Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments to Grant Loans
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Commitments to grant loans	$ 44,712	$ 292,199
Standby Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Letters of credit	216,267	213,548
Performance Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Performance letters of credit	23,565	27,985
Commercial Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Letters of credit	20,126	15,587
Commitments to Extend Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Commitments to extend credit	$ 3,985,508	$ 4,667,360

Disclosure About Fair Values _3

Disclosure About Fair Values of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Investment securities available-for-sale	$ 2,461,644	$ 2,368,592
Derivative assets	66,333	257,137
Liabilities
Derivative liabilities	19,543	11,211
Carrying Value
Assets
Investment securities available-for-sale	2,461,644	2,368,592
Equity securities with readily determinable fair values not held for trading	1,529	1,862
Derivative assets	66,333	257,137
Liabilities
Derivative liabilities	19,543	11,211
Level 1
Assets
Equity securities with readily determinable fair values not held for trading	1,529	1,862
Level 2
Assets
Investment securities available-for-sale	2,461,644	2,368,592
Derivative assets	66,333	257,137
Liabilities
Derivative liabilities	19,543	11,211
Fair Value, Measurements, Recurring | Carrying Value
Assets
Investment securities available-for-sale	2,461,644	2,368,592
Equity securities with readily determinable fair values not held for trading	1,529	1,862
Derivative assets	66,333	257,137
Other assets	27,798	26,882
Total assets	2,557,304	2,654,473
Liabilities
Derivative liabilities	19,543	11,211
Total recurring basis measured liabilities	19,543	11,211
Fair Value, Measurements, Recurring | Level 1
Assets
Equity securities with readily determinable fair values not held for trading	1,529	1,862
Total assets	1,529	1,862
Fair Value, Measurements, Recurring | Level 2
Assets
Investment securities available-for-sale	2,461,644	2,368,592
Derivative assets	66,333	257,137
Total assets	2,527,977	2,625,729
Liabilities
Derivative liabilities	19,543	11,211
Total recurring basis measured liabilities	19,543	11,211
Fair Value, Measurements, Recurring | Level 3
Assets
Other assets	27,798	26,882
Total assets	$ 27,798	$ 26,882

Disclosure About Fair Values _4

Disclosure About Fair Values of Financial Instruments - Summary of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Profits Interests
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 4,330	$ 5,779
Net gains (losses) included in earnings	(259)	(174)
Distributions received		(288)
Ending Balance	4,071	5,317
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	(259)	(174)
Investments in Limited Partnerships
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	18,742	11,191
Net gains (losses) included in earnings	(316)	746
Reclassifications	525	(800)
Contributions paid	1,283	608
Distributions received	(449)	(144)
Ending Balance	19,785	11,601
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	(316)	746
SBA Servicing Assets
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	3,811
Acquired		6,213
Originations	299	320
Net gains (losses) included in earnings	(168)	(2,730)
Ending Balance	3,942	3,803
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	$ (168)	$ (2,730)

Disclosure About Fair Values _5

Disclosure About Fair Values of Financial Instruments - Summary of Assets Recorded at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Individually evaluated loans, net of allocated allowance for credit losses		$ 147,618		$ 101,939
Level 2
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale		38,221	$ 87,649
Fair Value, Nonrecurring
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale		38,221	87,649
Individually evaluated loans, net of allocated allowance for credit losses	[1]	128,519	101,561
Other real estate and repossessed assets		11,608
Other real estate			1,628
Total assets		178,348	190,838
Fair Value, Nonrecurring | Level 2
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale		38,221	87,649
Total assets		38,221	87,649
Fair Value, Nonrecurring | Level 3
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Individually evaluated loans, net of allocated allowance for credit losses	[1]	128,519	101,561
Other real estate and repossessed assets		11,608
Other real estate			1,628
Total assets		$ 140,127	$ 103,189
[1]	Prior to the adoption of CECL on January 1, 2020, these loans were known as Impaired loans, net of specific allowance.

Disclosure About Fair Values _6

Disclosure About Fair Values of Financial Instruments - Summary of Significant Unobservable Inputs Used in Level 3 Fair Value Measurements for Financial Assets Measured at Fair Value On a Nonrecurring Basis (Details) - Level 3 $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Minimum Guaranteed Proceeds Per Settlement Agreement
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs			Minimum guaranteed proceeds per Settlement Agreement
Range/Weighted Average	[1]		0.00%
Discount of Fair Value | Individually Evaluated, Net of Allocated Allowance for Credit Losses
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs	[2]	Discount to fair value	Discount to fair value
Discount of Fair Value | Individually Evaluated, Net of Allocated Allowance for Credit Losses | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average	[2]	0.00%	0.00%
Discount of Fair Value | Individually Evaluated, Net of Allocated Allowance for Credit Losses | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average	[2]	50.00%	50.00%
Discount of Fair Value | Individually Evaluated, Net of Allocated Allowance for Credit Losses | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value inputs, discount rate	[2],[3]	0.38
Discount of Fair Value | Individually Evaluated, Net of Allocated Allowance for Credit Losses | Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying Value	[2]	$ 128,519	$ 101,561
Discount of Fair Value | Other
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs		Discount to fair value	Discount to fair value
Discount of Fair Value | Other | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average		0.00%	0.00%
Discount of Fair Value | Other | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average		20.00%	20.00%
Discount of Fair Value | Other | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average	[3]	10.00%
Discount of Fair Value | Other | Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying Value		$ 1,008	$ 1,628
Discounted Cash Flow
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs		Discount rate	Discount rate 5.8%
Range/Weighted Average	[1]		0.00%
Discounted Cash Flow | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average		3.75%
Discounted Cash Flow | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average		5.80%
Discounted Cash Flow | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value	[3]	4.70%
Discounted Cash Flow | Measurement Input, Discount Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value inputs, discount rate			0.058
Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs			Exit and earnings multiples, discounted cash flows, and market comparables
Enterprise Value | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value	[1]		0.00%
Enterprise Value | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value	[1]		46.00%
Enterprise Value | Comparables and Average Multiplier
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs		Comparables and average multiplier
Enterprise Value | Comparables and Average Multiplier | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value		5.00%
Enterprise Value | Comparables and Average Multiplier | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value		6.60%
Enterprise Value | Comparables and Average Multiplier | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value	[3]	5.33%
Enterprise Value | Discount Rates and Comparables
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs		Discount rates and comparables
Enterprise Value | Discount Rates and Comparables | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value		6.40%
Enterprise Value | Discount Rates and Comparables | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value		16.00%
Enterprise Value | Discount Rates and Comparables | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements, percentage of enterprise value	[3]	12.00%
Net Recoverable Oil And Gas Reserves And Forward Looking Commodity Prices
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs		Capitalization rate and discount rate
Net Recoverable Oil And Gas Reserves And Forward Looking Commodity Prices | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average	[3]	18.00%
Estimated Closing Costs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs		Estimated closing costs	Estimated closing costs
Range/Weighted Average		10.00%	10.00%
Estimated Closing Costs | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average	[3]	10.00%
[1]	Represents difference of remaining balance to fair value.
[2]	Prior to the adoption of CECL on January 1, 2020, these loans were known as Impaired loans, net of specific allowance.
[3]	Weighted averages were calculated using the input attribute and the outstanding balance of the loan

Disclosure About Fair Values _7

Disclosure About Fair Values of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial Assets:
Interest-bearing deposits with banks	$ 391,362	$ 725,343
Federal funds sold	5,331	10,974
Investment securities available-for-sale	2,461,644	2,368,592
Derivative assets	66,333	257,137
Other assets	410,152	512,244
Financial Liabilities:
Advances from FHLB	100,000	100,000
Senior debt	49,955	49,938
Subordinated debt	183,032	182,712
Junior subordinated debentures	37,351	37,445
Notes payable	2,102	2,078
Derivative liabilities	19,543	11,211
Level 1
Financial Assets:
Cash and due from banks	212,658	252,447
Interest-bearing deposits with banks	391,362	725,343
Federal funds sold	5,331	10,974
Equity securities with readily determinable fair values not held for trading	1,529	1,862
Level 2
Financial Assets:
Investment securities available-for-sale	2,461,644	2,368,592
Loans held for sale	38,221	87,649
Derivative assets	66,333	257,137
Financial Liabilities:
Deposits	14,499,103	14,753,192
Advances from FHLB	100,000	100,000
Senior debt	51,313	51,202
Subordinated debt	187,781	189,386
Junior subordinated debentures	45,728	48,012
Notes payable	2,102	2,078
Derivative liabilities	19,543	11,211
Level 3
Financial Assets:
Net loans	13,030,957	12,755,360
Other assets	83,225	72,719
Carrying Value
Financial Assets:
Cash and due from banks	212,658	252,447
Interest-bearing deposits with banks	391,362	725,343
Federal funds sold	5,331	10,974
Investment securities available-for-sale	2,461,644	2,368,592
Equity securities with readily determinable fair values not held for trading	1,529	1,862
Loans held for sale	38,221	87,649
Net loans	13,146,945	12,864,012
Derivative assets	66,333	257,137
Other assets	83,225	72,719
Financial Liabilities:
Deposits	14,489,505	14,742,794
Advances from FHLB	100,000	100,000
Senior debt	49,955	49,938
Subordinated debt	183,032	182,712
Junior subordinated debentures	37,351	37,445
Notes payable	2,102	2,078
Derivative liabilities	19,543	11,211
Fair Value
Financial Assets:
Cash and due from banks	212,658	252,447
Interest-bearing deposits with banks	391,362	725,343
Federal funds sold	5,331	10,974
Investment securities available-for-sale	2,461,644	2,368,592
Equity securities with readily determinable fair values not held for trading	1,529	1,862
Loans held for sale	38,221	87,649
Net loans	13,030,957	12,755,360
Derivative assets	66,333	257,137
Other assets	83,225	72,719
Financial Liabilities:
Deposits	14,499,103	14,753,192
Advances from FHLB	100,000	100,000
Senior debt	51,313	51,202
Subordinated debt	187,781	189,386
Junior subordinated debentures	45,728	48,012
Notes payable	2,102	2,078
Derivative liabilities	$ 19,543	$ 11,211

Variable Interest Entities an_3

Variable Interest Entities and Other Investments - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)Customer	Mar. 31, 2019USD ($)	Dec. 31, 2016Customer
Variable Interest Entities and Other Investments [Line Items]
Equity method investments	$ 12,498,000	$ 8,681,000	$ 8,714,000	$ 10,208,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities and Other Investments [Line Items]
Cost method investments	19,800,000	18,700,000
Loss recognized from assets at fair value	300,000
Gain recognized from assets at fair value		700,000
Equity method investments	12,500,000	8,700,000
Total marketable equity securities	1,500,000	1,900,000
Number of loan customers | Customer					2
Number of loan customers sold | Customer			1
Net profits interest	4,100,000	4,300,000
Variable Interest Entity, Not Primary Beneficiary | Rabbi Trust
Variable Interest Entities and Other Investments [Line Items]
Defined rabbi trust assets and benefit obligation	3,300,000	3,700,000
Variable Interest Entity, Not Primary Beneficiary | Limited Partner
Variable Interest Entities and Other Investments [Line Items]
Equity method investments	9,000,000	9,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Assets
Variable Interest Entities and Other Investments [Line Items]
Investments in affordable Housing Project	$ 27,600,000	$ 28,200,000

Variable Interest Entities an_4

Variable Interest Entities and Other Investments - Summary of Investment in Limited Partnerships (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Variable Interest Entities and Other Investments [Line Items]
Limited partnerships required to be accounted for under the equity method	$ 12,498	$ 8,681	$ 10,208	$ 8,714
Investments in Limited Partnerships
Variable Interest Entities and Other Investments [Line Items]
Affordable housing projects (amortized cost)	27,635	28,205
Limited partnerships accounted for under the fair value practical expedient of NAV	19,785	18,742
Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method	12,498	8,681
Limited partnerships required to be accounted for under the equity method	8,951	8,951
Total investments in limited partnerships	$ 68,869	$ 64,579

Variable Interest Entities an_5

Variable Interest Entities and Other Investments - Summary of Carrying Amount of Equity Investments Measured Under Measurement Alternative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Variable Interest Entities And Other Investments [Abstract]
Carrying value, Beginning of Year	$ 8,681	$ 8,714
Reclassifications	(525)	800
Distributions	(215)	(42)
Contributions	300	736
Acquired in Settlement of Loans	4,257
Carrying value, End of Period	$ 12,498	$ 10,208

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)Segment
Segment Reporting Information [Line Items]
Number of operating segments | Segment	3
Non-cash goodwill impairment charge	$ 443,695
Banking
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charge	$ 443,695

Segment Reporting - Summary of

Segment Reporting - Summary of Operating Results of Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 153,468	$ 169,289
Provision for credit losses	83,429	11,210
Noninterest income	35,069	30,664
Noninterest expense	537,653	113,440
Income tax (benefit) expense	(33,234)	17,102
Net (loss) income	(399,311)	58,201
Total assets	17,237,918	17,452,911	$ 17,800,229
Banking
Segment Reporting Information [Line Items]
Net interest income (expense)	157,557	174,396
Provision for credit losses	83,429	11,210
Noninterest income	25,343	20,087
Noninterest expense	528,066	97,324
Income tax (benefit) expense	(30,922)	19,862
Net (loss) income	(397,673)	66,087
Total assets	17,142,981	17,347,134
Financial Services
Segment Reporting Information [Line Items]
Net interest income (expense)	(352)	(630)
Noninterest income	10,208	10,285
Noninterest expense	8,710	7,652
Income tax (benefit) expense	95	373
Net (loss) income	1,051	1,630
Total assets	90,600	100,175
Corporate
Segment Reporting Information [Line Items]
Net interest income (expense)	(3,737)	(4,477)
Noninterest income	(482)	292
Noninterest expense	877	8,464
Income tax (benefit) expense	(2,407)	(3,133)
Net (loss) income	(2,689)	(9,516)
Total assets	$ 4,337	$ 5,602

Equity-based Compensation - Add

Equity-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 01, 2018	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted		0	645,346
Number of unit expected to vest		1,012,766	844,354	1,229,863	273,354
Equity-based compensation expense		$ 1,100	$ 900
Remaining expense related to unvested restricted stock units		$ 15,400
Restricted Stock Units | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense recognition period		12 months
Restricted Stock Units | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense recognition period		42 months
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense recognition period		22 months
Expense related to nonvested stock option grants		$ 2,200
Stock Options | Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense		$ 309	$ 252
Number of options granted		0	1,602,848
Percentage of premium on common stock value, options granted		15.00%
Weighted-average exercise price		$ 20.43
Award vesting period		3 years
Option expiration period		7 years
Stock options vested		534,283
Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares available for grant		7,500,000
Shares of common stock remain available for future grants		4,200,000
Plan | Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted		0	645,346
Plan | Restricted Stock Units | Vest in First Quarter of 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		41,843
Plan | Restricted Stock Units | Vest in Third Quarter of 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		2,116
Plan | Restricted Stock Units | Vesting Quarterly
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		277,302
Plan | Restricted Stock Units | Cliff-Vest
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		29,181
Plan | Restricted Stock Units | Vest in First Quarter of 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		48,562
Plan | Restricted Stock Units | Vest in First Quarter of 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		177,236
Plan | Restricted Stock Units | Vest in Second Quarter of 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		1,000
Plan | Restricted Stock Units | Vest in Second Quarter of 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		6,998
Plan | Restricted Stock Units | Vest in Third Quarter of 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest		9,901
Plan | Restricted Stock Units | Half of Units Granted | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage		25.00%
Plan | Restricted Stock Units | Half of Units Granted | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage		200.00%
2018 Employee Stock Purchase Plan | Common Class A
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense		$ 14	$ 92
Percentage of discount on fair market value of common stock	15.00%
Common stock purchased in the open market		67,844	25,519
2018 Employee Stock Purchase Plan | Maximum | Common Class A
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount of common stock may be granted	500,000

Equity-based Compensation - Sum

Equity-based Compensation - Summary of Activity Related to Restricted Stock Unit Awards (Details) - Restricted Stock Units - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Non-vested at beginning of period	1,229,863	273,354
Number of shares, Granted during the period	0	645,346
Number of shares, Vested during the period	(160,668)	(44,501)
Number of shares, Forfeited during the period	(56,429)	(29,845)
Number of shares, Non-vested at end of period	1,012,766	844,354
Weighted average fair value per unit at award date, Non-vested at beginning of period	$ 19.97	$ 26.49
Weighted average fair value per unit at award date, Granted during the period	0	17.87
Weighted average fair value per unit at award date, Vested during the period	20.55	26.50
Weighted average fair value per unit at award date, Forfeited during the period	20.20	19.76
Weighted average fair value per unit at award date, Non-vested at end of period	$ 19.86	$ 20.14

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 2,460,846	$ 1,438,274
Net change	165,971	60,773
Balance	2,113,543	2,302,823
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	19,605	(24,279)
Net change	45,842	22,602
Balance	65,447	(1,677)
Unrealized Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	95,097	(18,305)
Net change	120,129	38,171
Balance	215,226	19,866
Unrealized Gains (Losses) on Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(328)
Balance		(328)
Accumulated OCI
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	114,702	(42,912)
Net change	165,971	60,773
Balance	$ 280,673	$ 17,861

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - $ / shares	Apr. 28, 2020	Mar. 31, 2020	Mar. 31, 2019
Subsequent Event [Line Items]
Cash dividends declared per common share		$ 0.175	$ 0.175
Subsequent Event | Quarterly Dividend
Subsequent Event [Line Items]
Cash dividends declared per common share	$ 0.05
Subsequent Event | Annualized Dividend
Subsequent Event [Line Items]
Cash dividends declared per common share	$ 0.20