Cadence Bancorporation 10-Q 10 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 07, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
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		124,724,742
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, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 205,425	$ 283,261
Interest-bearing deposits with banks	1,680,087	1,768,847
Federal funds sold	3,006	1,838
Total cash and cash equivalents	1,888,518	2,053,946
Investment securities available-for-sale, amortized cost of $3,925,547 and allowance for credit losses of zero at March 31, 2021 and amortized cost of $3,249,067 and allowance for credit losses of zero at December 31, 2020	3,918,666	3,332,168
FRB and FHLB stock	69,858	76,552
Loans held for sale	46,696	47,018
Loans, net of unearned income	12,365,334	12,719,129
Less: allowance for credit losses	(308,037)	(367,160)
Net loans	12,057,297	12,351,969
Premises and equipment, net	124,303	123,630
Cash surrender value of life insurance	187,195	187,626
Net deferred tax asset	72,071	63,699
Goodwill	43,061	43,061
Other intangible assets, net	78,795	83,780
Other assets	313,890	349,118
Total assets	18,800,350	18,712,567
Liabilities:
Noninterest-bearing deposits	5,556,217	5,033,748
Interest-bearing deposits	10,572,982	11,018,497
Total deposits	16,129,199	16,052,245
Federal Home Loan Bank advances	100,000	100,000
Senior debt	49,994	49,986
Subordinated debt	143,575	183,344
Junior subordinated debentures	37,694	37,637
Notes payable	1,721	1,702
Other liabilities	245,631	166,551
Total liabilities	16,707,814	16,591,465
Shareholders' equity:
Common stock, $0.01 par value, authorized 300,000,000 shares; 133,508,293 shares issued and 124,698,518 shares outstanding at March 31, 2021 and 133,214,844 shares issued and 125,978,561 shares outstanding at December 31, 2020	1,335	1,332
Additional paid-in capital	1,881,957	1,880,930
Treasury stock, at cost; 8,809,775 shares and 7,236,283 shares, respectively	(160,884)	(130,889)
Retained earnings	346,929	259,643
Accumulated other comprehensive income	23,199	110,086
Total shareholders' equity	2,092,536	2,121,102
Total liabilities and shareholders' equity	$ 18,800,350	$ 18,712,567

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Available-for-sale securities, Amortized cost	$ 3,925,547	$ 3,249,067
Allowance for credit losses	$ 0	$ 0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	133,508,293	133,214,844
Common Stock, Shares, Outstanding	124,698,518	125,978,561
Treasury stock, shares outstanding	8,809,775	7,236,283

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST INCOME
Interest and fees on loans	$ 139,824	$ 175,134
Interest and dividends on securities:
Taxable	11,821	14,015
Tax-exempt	2,035	1,427
Other interest income	1,021	2,178
Total interest income	154,701	192,754
INTEREST EXPENSE
Interest on time deposits	4,277	12,744
Interest on other deposits	3,704	21,984
Interest on borrowed funds	3,972	4,558
Total interest expense	11,953	39,286
Net interest income	142,748	153,468
Provision (release) for credit losses	(48,262)	83,429
Net interest income after provision (release) for credit losses	191,010	70,039
NONINTEREST INCOME
Investment advisory revenue	7,609	5,605
Trust services revenue	5,509	4,815
Credit related fees	3,849	5,983
Service charges on deposit accounts	6,404	6,416
Mortgage banking income	2,115	1,111
Bankcard fees	1,753	1,958
Payroll processing revenue	1,490	1,367
SBA income	3,967	1,908
Other service fees	2,209	1,912
Securities gains, net	2,259	2,994
Other income	6,532	1,000
Total noninterest income	43,696	35,069
NONINTEREST EXPENSE
Salaries and employee benefits	57,070	48,807
Premises and equipment	10,374	10,808
Merger related expenses		1,282
Goodwill impairment		443,695
Intangible asset amortization	4,986	5,592
Other expense	25,392	27,469
Total noninterest expense	97,822	537,653
Income (loss) before income taxes	136,884	(432,545)
Income tax expense (benefit)	30,459	(33,234)
Net income (loss)	$ 106,425	$ (399,311)
Weighted average common shares outstanding (Basic)	125,079,250	126,630,446
Weighted average common shares outstanding (Diluted)	125,621,508	126,630,446
Earnings (loss) per common share (Basic)	$ 0.85	$ (3.15)
Earnings (loss) per common share (Diluted)	$ 0.84	$ (3.15)

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 106,425	$ (399,311)
Unrealized (losses) gains on securities available-for-sale:
Net unrealized (losses) gains, net of income taxes of ($20,641) and $15,149	(67,083)	48,126
Less reclassification adjustments for gains realized in net income, net of income taxes of $532 and $710	1,727	2,284
Net change in unrealized (losses) gains on securities available-for-sale, net of tax	(68,810)	45,842
Unrealized (losses) gains on derivative instruments designated as cash flow hedges:
Net unrealized (losses) gains, net of income taxes of ($2,243) and $40,919	(7,289)	126,314
Less reclassification adjustments for gains realized in net income, net of income taxes of $3,308 and $1,922	10,788	6,185
Net change in unrealized (losses) gains on derivative instruments, net of tax	(18,077)	120,129
Other comprehensive (loss) income, net of tax	(86,887)	165,971
Comprehensive income (loss)	$ 19,538	$ (233,340)

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net unrealized (losses) gains on securities available-for-sale, taxes	$ (20,641)	$ 15,149
Reclassification adjustments for gains on securities available-for-sale realized in net income, taxes	532	710
Net unrealized (losses) gains on derivative instruments designated as cash flow hedges, taxes	(2,243)	40,919
Reclassification adjustments for gains on derivative instruments designated as cash flow hedges realized in net income, taxes	$ 3,308	$ 1,922

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A Common Shares Outstanding	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Accumulated OCI
Balance at Dec. 31, 2019	$ 2,460,846	$ (62,779)		$ 1,330	$ 1,873,063	$ (100,752)	$ 572,503	$ (62,779)	$ 114,702
Balance, Shares at Dec. 31, 2019			127,598
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member						us-gaap:AccountingStandardsUpdate201613Member
Net income (loss)	(399,311)						(399,311)
Equity-based compensation cost	1,064		$ 131	1	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)
Other comprehensive income (loss)	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
Balance at Dec. 31, 2020	2,121,102			1,332	1,880,930	(130,889)	259,643		110,086
Balance, Shares at Dec. 31, 2020			125,979
Net income (loss)	106,425						106,425
Equity-based compensation cost	1,030		$ 293	3	1,027
Cash dividends declared	(18,904)						(18,904)
Dividend equivalents on restricted stock units	(235)						(235)
Purchase of treasury stock, at cost	(29,995)					(29,995)
Purchase of treasury stock, at cost, Shares			(1,573)
Other comprehensive income (loss)	(86,887)								(86,887)
Balance at Mar. 31, 2021	$ 2,092,536			$ 1,335	$ 1,881,957	$ (160,884)	$ 346,929		$ 23,199
Balance, Shares at Mar. 31, 2021			124,699

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share	$ 0.15	$ 0.175

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Cash Flows [Abstract]
CASH FLOWS FROM OPERATING ACTIVITIES	$ 78,014	$ 409,335
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of securities available-for-sale	(970,633)	(240,734)
Proceeds from sales of securities available-for-sale	118,697	37,884
Proceeds from maturities, calls and paydowns of securities available-for-sale	255,332	113,400
Purchases of other securities, net		(574)
Proceeds from sales of loans transferred to held for sale		46,866
Decrease (increase) in loans, net	355,420	(436,758)
Purchase of premises and equipment	(5,335)	(2,742)
Proceeds from disposition of foreclosed property	10	1,182
Other, net	15,012	(1,871)
Net cash used in investing activities	(231,497)	(483,347)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in deposits, net	76,954	(253,289)
Repayment of subordinated debt	(40,000)
Repurchase of common stock	(29,995)	(29,973)
Cash dividends paid on common stock	(18,904)	(22,139)
Net cash used in financing activities	(11,945)	(305,401)
Net decrease in cash and cash equivalents	(165,428)	(379,413)
Cash and cash equivalents at beginning of period	2,053,946	988,764
Cash and cash equivalents at end of period	1,888,518	609,351
Cash paid during the period for:
Interest	10,418	39,487
Income taxes paid (refunded), net	2	(234)
Cash paid for amounts included in lease liabilities	2,798	2,767
Non-cash investing activities (at fair value):
Acquisition of real estate and other assets in settlement of loans	10	11,162
Transfers of loans held for sale to loans	175	10,500
Transfers of loans to loans held for sale	3,208
Securities (purchased) sold, net, with settlement after quarter end	(33,526)	57,157
Right-of-use assets obtained (remeasured) in exchange for operating lease liabilities	$ 4,145	$ (125)

Summary of Accounting Policies

Summary of Accounting Policies	3 Months Ended
	Mar. 31, 2021
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, 2020. Operating results for the period ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The Company and its subsidiaries follow GAAP, 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 13). Certain amounts reported in prior years have been reclassified to conform to the 2021 presentation. These reclassifications did not materially impact the Company’s consolidated balance sheets or consolidated statements of operations. In accordance with Pronouncements adopted during the three months ended March 31, 2021 ASU No. 2019-12 In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes The Company adopted this guidance on January 1, 2021, with no material impact on the consolidated financial statements. ASU No. 2020-01 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) The Company adopted this guidance on January 1, 2021, with no material impact on the consolidated financial statements. ASU No. 2020-08 In October 2020, the FASB issued ASU No. 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs The Company adopted this guidance on January 1, 2021 . As Cadence does not currently own any callable bonds at a premium, the adoption of this guidance ha d no immediate impact on our consolidated financial statements. ASU No. 2020-10 In October 2020, the FASB issued ASU No. 2020-10, Codification Improvements The Company adopted this guidance on January 1, 2021. The amendments in this Update did not change GAAP and, therefore, did not have a material impact on the consolidated financial statements. ASU No. 2021-01 In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848): Scope. This guidance was effective for all entities upon issuance and generally can be applied through December 31, 2022, similar to existing relief provided under ASC 848. Entities may elect to apply the guidance on contract modifications either (1) retrospectively as of any date from the beginning of any interim period that includes March 12, 2020 or (2) prospectively to new modifications from any date in an interim period that includes or is after January 7, 2021, up to the date that financial statements are available to be issued. Entities may elect to apply the guidance on hedge accounting to eligible hedging relationships that existed as of the beginning of an interim period that includes March 12, 2020 and to those entered into after the beginning of the interim period that includes that date. The adoption of this guidance had no immediate impact on our consolidated financial statements. Pending Accounting Pronouncements ASU No. 2020-06 In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity The guidance is effective for annual periods beginning after December 15, 2021, and interim periods within those fiscal years. The FASB specified that an entity should adopt the guidance as of the beginning of its annual fiscal year. As Cadence does not currently have any convertible debt or hedging contracts in our own equity, this guidance will have no impact on our consolidated financial statements.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2021
Investments Debt And Equity Securities [Abstract]
Investment Securities	Note 2—Investment Securities A summary of amortized cost and estimated fair value of securities available-for-sale at March 31, 2021 and December 31, 2020 is as follows: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value March 31, 2021 Securities available-for-sale: Obligations of U.S. government agencies $ 309,194 $ 426 $ 13,241 $ 296,379 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 131,472 1,947 477 132,942 Issued by FNMA and FHLMC 2,440,906 28,093 31,160 2,437,839 Other residential mortgage-backed securities 209,464 4,285 2,386 211,363 Commercial mortgage-backed securities 433,408 4,741 9,532 428,617 Total MBS 3,215,250 39,066 43,555 3,210,761 Obligations of states and municipal subdivisions 351,103 12,220 1,944 361,379 Foreign debt security 50,000 147 — 50,147 Total securities available-for-sale $ 3,925,547 $ 51,859 $ 58,740 $ 3,918,666 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value December 31, 2020 Securities available-for-sale: Obligations of U.S. government agencies $ 289,565 $ 1,281 $ 2,117 $ 288,729 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 122,366 3,029 60 125,335 Issued by FNMA and FHLMC 1,870,399 47,020 530 1,916,889 Other residential mortgage-backed securities 211,860 5,143 348 216,655 Commercial mortgage-backed securities 420,700 13,110 2,033 431,777 Total MBS 2,625,325 68,302 2,971 2,690,656 Obligations of states and municipal subdivisions 334,177 18,610 4 352,783 Total securities available-for-sale $ 3,249,067 $ 88,193 $ 5,092 $ 3,332,168 The scheduled contractual maturities of securities available-for-sale at March 31, 2021 were as follows: Amortized Estimated (In thousands) Cost Fair Value Due in one year or less $ — $ — Due after one year through five years 933 925 Due after five years through ten years 168,331 167,763 Due after ten years 541,033 539,217 Mortgage-backed securities 3,215,250 3,210,761 Total $ 3,925,547 $ 3,918,666 Gross gains and gross losses on sales of securities available-for-sale for the three months ended March 31, 2021 and 2020 are presented below. There were no impairment charges related to credit losses included in gross realized losses for the three months ended March 31, 2021 and 2020. 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) 2021 2020 Gross realized gains $ 2,261 $ 2,994 Gross realized losses 2 — Realized gains (losses), net $ 2,259 $ 2,994 Securities with a carrying value of $1.3 billion at March 31, 2021 and December 31, 2020 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, 2021 Obligations of U.S. government agencies $ 229,306 $ 12,998 $ 28,764 $ 243 Mortgage-backed securities 1,887,482 43,307 31,169 248 Obligations of states and municipal subdivisions 82,175 1,944 — — Total $ 2,198,963 $ 58,249 $ 59,933 $ 491 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, 2020 Obligations of U.S. government agencies $ 151,172 $ 1,868 $ 30,658 $ 249 Mortgage-backed securities 360,197 2,832 18,476 139 Obligations of states and municipal subdivisions 841 4 — — Total $ 512,210 $ 4,704 $ 49,134 $ 388 As of March 31, 2021 and December 31, 2020, approximately 58% and 17%, respectively, of the fair value of securities in the investment portfolio reflected an unrealized loss. As of March 31, 2021, there were 14 securities that had been in a loss position for more than twelve months, and 196 securities that had been in a loss position for less than 12 months. As of March 31, 2021, 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. The unrealized losses were primarily impacted by recent changes in the interest rate environment and none relate to the marketability of the securities or the issuer’s ability to honor redemption of the obligations. As of March 31, 2021, 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, 2021
Receivables [Abstract]
Loans Held for Sale, Loans and Allowance for Credit Losses	Note 3—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, 2021 and December 31, 2020. (In thousands) March 31, 2021 December 31, 2020 Commercial and industrial $ 39,014 $ 33,339 Commercial real estate 474 780 Consumer 7,208 12,899 Total loans held for sale (1) $ 46,696 $ 47,018 (1) $0.1 Loans The following table presents total loans outstanding by portfolio segment and class of financing receivable as of March 31, 2021 and December 31, 2020. Outstanding balances include originated loans, Acquired Noncredit Impaired (“ANCI”) loans, and Purchase Credit Deteriorated (“PCD”) loans. (In thousands) March 31, 2021 December 31, 2020 Commercial and industrial General C&I $ 4,189,775 $ 4,421,286 Energy 1,287,406 1,310,612 Restaurant 924,314 971,662 Healthcare 526,552 547,491 Total commercial and industrial 6,928,047 7,251,051 Commercial real estate Industrial, retail, and other 1,723,545 1,683,975 Multifamily 804,495 776,494 Office 445,130 452,639 Total commercial real estate 2,973,170 2,913,108 Consumer Residential 2,375,017 2,452,865 Other 89,100 102,105 Total consumer 2,464,117 2,554,970 Total (1) $ 12,365,334 $ 12,719,129 (1) $47.6 million and $47.0 million of net accrued interest receivable is excluded from the total loan balances above as of March 31, 2021 and December 31, 2020, respectively. Paycheck Protection Program. The Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) created the Paycheck Protection Program (“PPP”) to provide certain small businesses with liquidity to support their operations during the COVID-19 pandemic. Entities must meet certain eligibility requirements to receive PPP loans, and they must maintain specified levels of payroll and employment to have the loans forgiven. The conditions are subject to audit by the U.S. government, but entities that borrow less than $2.0 million (together with any affiliates) will be deemed to have made the required certification concerning the necessity of the loan in good faith. However, the SBA does reserve the right to audit any PPP borrower Under the PPP, eligible small businesses can apply to an SBA-approved lender for a loan that does not require collateral or personal guarantees. The loans have a 1% fixed interest rate. Loans issued prior to June 5, 2020 are due in two years unless otherwise modified and loans issued after June 5, 2020 are due in five years. However, they are eligible for forgiveness (in full or in part, including any accrued interest) under certain conditions. The following table presents the Company’s PPP loans by portfolio segment and class of financing receivable as of March 31, 2021 and December 31, 2020. March 31, 2021 December 31, 2020 (In thousands) Amortized Cost % of PPP Portfolio Amortized Cost % of PPP Portfolio Commercial and industrial General C&I $ 555,274 68.8 % $ 648,458 69.1 % Energy 67,512 8.4 76,228 8.1 Restaurant 119,662 14.8 134,454 14.4 Healthcare 64,897 8.0 79,120 8.4 Total PPP loans $ 807,345 100.0 % $ 938,260 100.0 % As a % of total loans 6.5 % 7.4 % 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. 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. The Company assigns risk ratings and risk grade classifications to all commercial loan (C&I and CRE) exposures using our internal dual credit risk rating system. The risk grade classifications are consistent with regulatory guidelines and are described as follows: • Pass—Loans for which 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—Loans which have 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. • Substandard—Loans which are 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 which 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 which are considered uncollectible and of such little value that their continuance as assets is not warranted without a specific valuation allowance or charge-off. We fully reserve for any loans rated as Loss. 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. The Company’s policies establish concentration limits for various industries within the commercial portfolio as well as commercial real estate and other regulatory categories. Concentration limits are monitored and reassessed on a periodic basis and approved by the Risk Management Committee of the Board of Directors on an annual basis. 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, 2021 and 2020 . For the Three Months Ended March 31, 2021 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Total Allowance for Credit Losses Reserve for Unfunded Commitments (1) Total As of December 31, 2020 $ 187,365 $ 141,187 $ 38,608 $ 367,160 $ 2,296 $ 369,456 Provision (release) for credit losses (9,594 ) (29,481 ) (7,940 ) (47,015 ) (1,247 ) (48,262 ) Charge-offs (14,124 ) (401 ) (146 ) (14,671 ) — (14,671 ) Recoveries 1,724 105 734 2,563 — 2,563 As of March 31, 2021 $ 165,371 $ 111,410 $ 31,256 $ 308,037 $ 1,049 $ 309,086 Allocation of ending ACL Loans collectively evaluated $ 139,542 $ 111,410 $ 31,256 $ 282,208 Loans individually evaluated 25,829 — — 25,829 ACL as of March 31, 2021 $ 165,371 $ 111,410 $ 31,256 $ 308,037 Loans (amortized cost) Loans collectively evaluated $ 6,849,604 $ 2,960,299 $ 2,462,334 $ 12,272,237 Loans individually evaluated 78,443 12,871 1,783 93,097 Loans as of March 31, 2021 (2) $ 6,928,047 $ 2,973,170 $ 2,464,117 $ 12,365,334 (1) The reserve for unfunded commitments is included in other liabilities on the consolidated balance sheets. (2) $47.6 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021. 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. (2) $45.3 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020. The provision for credit losses was a release of $48.3 million for the quarter which reflects both improvements in credit quality, including C&I – Restaurant and CRE – Hospitality, and the economic forecast used in our ACL model. The Company’s estimate of the ACL used the baseline scenario provided by a nationally recognized service, as adjusted for consideration of certain qualitative and environmental factors. These adjustments consider, among other factors, risk attributes of each portfolio, relevant third-party research, and energy prices. Loan charge-offs recognized during 2021 are lower than 2020 as a result of improved levels of nonperforming and criticized loans The Company’s individually evaluated loans totaling $93.1 million at March 31, 2021 are considered collateral dependent loans and generally are considered impaired. The majority of these loans are within the C&I segment and include loans in the Energy, Restaurant, and General C&I classes and are supported by an enterprise valuation or by collateral such as real estate, receivables, equipment or inventory. Loans within the CRE and consumer segments are generally 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, 2021. 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 2021 vintage relate to credits in resolution. Amortized Cost Basis by Origination Year Revolving Credits (In thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Loans Converted to Term Loans Total Commercial and industrial Pass $ 285,913 $ 1,472,441 $ 539,095 $ 752,344 $ 537,347 $ 786,593 $ 1,909,311 $ 45,200 $ 6,328,244 Special mention — 272 24,948 11,555 202 8,783 120,640 23 166,423 Substandard 22 51,601 19,085 97,720 39,644 80,720 108,406 10,353 407,551 Doubtful — — — 7,188 188 5,291 13,162 — 25,829 Total commercial and industrial 285,935 1,524,314 583,128 868,807 577,381 881,387 2,151,519 55,576 6,928,047 Commercial real estate Pass 47,324 504,746 551,851 634,135 405,782 514,103 113,040 — 2,770,981 Special mention — 746 42 23,060 30,382 7,668 194 — 62,092 Substandard 93 — 14,683 19,171 38,522 67,344 284 — 140,097 Doubtful — — — — — — — — — Total commercial real estate 47,417 505,492 566,576 676,366 474,686 589,115 113,518 — 2,973,170 Consumer Current 98,961 460,461 384,968 447,624 231,131 586,505 227,281 — 2,436,931 30-59 days past due — 365 1,161 2,391 133 9,171 713 — 13,934 60-89 days past due — — 353 2,268 88 2,313 176 — 5,198 90+ days past due — — 1,233 2,620 294 3,907 — — 8,054 Total consumer 98,961 460,826 387,715 454,903 231,646 601,896 228,170 — 2,464,117 Total (1) $ 432,313 $ 2,490,632 $ 1,537,419 $ 2,000,076 $ 1,283,713 $ 2,072,398 $ 2,493,207 $ 55,576 $ 12,365,334 (1) $47.6 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021. 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, 2021 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 $ 6,295 $ 1,090 $ 8,543 $ 15,928 $ 4,173,847 $ 4,189,775 $ 25 Energy — — 1,642 1,642 1,285,764 1,287,406 — Restaurant 642 9,359 5,662 15,663 908,651 924,314 — Healthcare 1,172 181 469 1,822 524,730 526,552 — Total commercial and industrial 8,109 10,630 16,316 35,055 6,892,992 6,928,047 25 Commercial real estate Industrial, retail, and other 13,345 11,226 2,024 26,595 1,696,950 1,723,545 — Multifamily — — — — 804,495 804,495 — Office 1,400 1,467 7,202 10,069 435,061 445,130 — Total commercial real estate 14,745 12,693 9,226 36,664 2,936,506 2,973,170 — Consumer Residential 13,439 5,094 8,021 26,554 2,348,463 2,375,017 1,341 Other 495 104 33 632 88,468 89,100 33 Total consumer 13,934 5,198 8,054 27,186 2,436,931 2,464,117 1,374 Total $ 36,788 $ 28,521 $ 33,596 $ 98,905 $ 12,266,429 $ 12,365,334 $ 1,399 (1) $47.6 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021. Age Analysis of Past-Due Loans as of December 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 $ 4,609 $ 11,653 $ 16,301 $ 32,563 $ 4,388,723 $ 4,421,286 $ 9,130 Energy — — 1,691 1,691 1,308,921 1,310,612 — Restaurant 7,561 302 5,283 13,146 958,516 971,662 — Healthcare 21 229 354 604 546,887 547,491 — Total commercial and industrial 12,191 12,184 23,629 48,004 7,203,047 7,251,051 9,130 Commercial real estate Industrial, retail, and other 12,619 2,884 2,647 18,150 1,665,825 1,683,975 125 Multifamily — 198 — 198 776,296 776,494 — Office 408 — 7,258 7,666 444,973 452,639 — Total commercial real estate 13,027 3,082 9,905 26,014 2,887,094 2,913,108 125 Consumer Residential 16,971 3,695 12,375 33,041 2,419,824 2,452,865 4,625 Other 179 5 — 184 101,921 102,105 — Total consumer 17,150 3,700 12,375 33,225 2,521,745 2,554,970 4,625 Total $ 42,368 $ 18,966 $ 45,909 $ 107,243 $ 12,611,886 $ 12,719,129 $ 13,880 (1) $47.0 million of net accrued interest receivable is excluded from the loan balances above as of December 31, 2020. 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, 2021. Nonaccrual Loans - Amortized Cost (1) 90+ Days (In thousands) December 31, 2020 March 31, 2021 No Allowance Recorded Past Due and Accruing (2) Interest Income Recognized Commercial and industrial General C&I $ 34,363 $ 21,222 $ 3,150 $ 25 $ 26 Energy 20,241 34,212 1,642 — 1 Restaurant 53,856 37,873 9,430 — 1 Healthcare 951 846 — — 497 Total commercial and industrial 109,411 94,153 14,222 25 525 Commercial real estate Industrial, retail, and other 7,301 6,177 3,624 — 86 Multifamily — — — — — Office 7,258 8,669 8,587 — 71 Total commercial real estate 14,559 14,846 12,211 — 157 Consumer Residential 14,028 14,361 1,096 1,341 114 Other 4 3 — 33 2 Total consumer 14,032 14,364 1,096 1,374 116 Total $ 138,002 $ 123,363 $ 27,529 $ 1,399 $ 798 (1) Nonperforming loans do not include nonperforming loans held for sale of $3.4 million and $0.2 million at March 31, 2021 and December 31, 2020, respectively (2) Less than $0.1 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021. 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 as TDRs during the periods indicated. For the Three Months Ended March 31, 2021 2020 (Dollars in thousands) Number of TDRs Amortized Cost (1) Number of TDRs Amortized Cost (1) Commercial and industrial General C&I — $ — 4 $ 33,339 Energy — — 1 8,105 Restaurant — — 2 24,247 Commercial real estate Industrial, retail, and other 1 2,362 — — Total 1 $ 2,362 7 $ 65,691 (1) There was zero and less than $0.1 million of net accrued interest receivable recorded on the loan balances above as of March 31, 2021 and 2020, respectively. For the 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, 2021 2020 Number of Loans Modified by: Rate Concession Modified Terms and/or Other Concessions Rate Concession Modified Terms and/or Other Concessions Commercial and industrial General C&I — — — 4 Energy — — 1 — Restaurant — — — 2 Commercial real estate Industrial, retail, and other — 1 — — Total — 1 1 6 Residential Mortgage Loans in Process of Foreclosure  Included in loans are $1.6 million of consumer loans secured by single-family residential real estate that are in process of foreclosure at March 31, 2021 and December 31, 2020. During 2020, we 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 $49 thousand of foreclosed single-family residential properties in other real estate owned as of March 31, 2021 and December 31, 2020

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	Note 4—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, 2021 and December 31, 2020 were as follows: March 31, 2021 December 31, 2020 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 $ 11,744 $ — $ 350,000 $ 22,560 $ — Total derivatives designated as hedging instruments 350,000 11,744 — 350,000 22,560 — Derivatives not designated as hedging instruments: Commercial loan interest rate swaps 1,188,783 13,916 2,503 1,200,581 20,699 1,647 Commercial loan interest rate caps 177,747 10 10 162,479 4 4 Commercial loan interest rate floors 551,412 9,654 9,654 560,048 11,986 11,986 Commercial loan interest rate collars 64,442 150 150 66,665 305 305 Mortgage loan held-for-sale interest rate lock commitments 26,126 249 — 33,458 531 — Mortgage loan forward sale commitments 8,021 100 — 11,081 112 — Mortgage loan held-for-sale floating commitments 4,746 — — 4,206 — — Foreign exchange contracts 67,500 986 829 89,707 780 1,058 Total derivatives not designated as hedging instruments 2,088,777 25,065 13,146 2,128,225 34,417 15,000 Total derivatives $ 2,438,777 $ 36,809 $ 13,146 $ 2,478,225 $ 56,977 $ 15,000 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, 2021 and December 31, 2020, the Company was required to post $9.3 million and $11.4 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 $10.6 million as of March 31, 2021 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. The Company records pre-tax gains and losses for derivatives not designated as hedging instruments in noninterest income on the consolidated statements of operations. For the three months ended March 31, 2021 and 2020, mortgage loans held for sale interest rate lock commitments incurred losses totaling $282 thousand compared to gains totaling $311 thousand, respectively. Foreign exchange contract gains totaled $1.1 million and $865 thousand for the three months ended March 31, 2021 and 2020. Pre-tax For the Three Months Ended March 31, 2021 2020 (In thousands) OCI Reclassified from AOCI to interest income OCI Reclassified from AOCI to interest income Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ (9,532 ) $ 1,284 $ 24,035 $ (106 ) Commercial loan interest rate collars — 12,812 143,198 8,213 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 March 2020, a notional interest rate collar of $4.0 billion was terminated, resulting in a $261.2 million realized gain initially recorded in other comprehensive income (“OCI”) net of deferred income taxes. The gain was forecast to reclass out of OCI and amortize into interest income through February 29, 2024 based on a continuing expectation of an adequate number of hedge-eligible loans. Due to the economic impacts of the COVID-19 pandemic, the hedge was given the accounting designation of partial ineffectiveness due to a forecasted shortfall of hedge-eligible loans which began in the fourth quarter of 2020 and continuing throughout the remaining term of the original hedge. As a result, during the fourth quarter of 2020, an accelerated hedge revenue of $169.2 million was recognized. Additional information is discussed in Note 7 of the Annual Report on Form 10-K for the year ended December 31, 2020. Based on our current interest rate forecast, $27.4 Interest Rate 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 operations. 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, 2021 and December 31, 2020.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2021
Deposits [Abstract]
Deposits	Note 5—Deposits Domestic time deposits $250,000 and over were $480.2 million and $486.3 million at March 31, 2021 and December 31, 2020, respectively.

Borrowed Funds

Borrowed Funds	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Borrowed Funds	Note 6—Borrowed Funds Senior and Subordinated Debt Our outstanding senior and subordinated debt consists of the following: (In thousands) March 31, 2021 December 31, 2020 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 3-month LIBOR plus 4.884%, subordinated notes, due March 11, 2025, callable in 2020 — 40,000 4.750% subordinated notes, due June 30, 2029, callable in 2024 85,000 85,000 Total — Cadence Bancorporation 170,000 210,000 Cadence Bank: 6.250% subordinated notes, due June 28, 2029, callable in 2024 25,000 25,000 Debt issue costs and unamortized premium (1,430 ) (1,670 ) Total senior and subordinated debt $ 193,570 $ 233,330 Details on the outstanding senior and subordinated debt are discussed in Note 10 of the Annual Report on Form 10-K for the year ended December 31, 2020. On February 5, 2021, the Company provided formal notification of the intent to call the $40 million fixed-to-floating rate subordinated notes due on March 11, 2025. All necessary approvals from the Federal Reserve and the Company’s Board of Directors had been received. Those notes were called on March 11, 2021. The Company’s outstanding senior notes are unsecured, unsubordinated obligations and are equal in right of payment to all the Company’s other unsecured debt. The Company’s subordinated notes are unsecured obligations and are subordinated in right of payment to all the Company’s senior indebtedness and general creditors and to depositors of the Bank. The Company’s senior 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 Our junior subordinated debt consists of the following: (In thousands) March 31, 2021 December 31, 2020 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 (12,925 ) (12,982 ) Total junior subordinated debentures $ 37,694 $ 37,637 Advances from FHLB Outstanding FHLB advances were $100 million as of March 31, 2021 and December 31, 2020. At March 31, 2021, the outstanding advance was a long-term convertible advance. Advances and letters of credit outstanding are collateralized by $3.7 billion of commercial and residential real estate loans pledged under a blanket lien arrangement as of March 31, 2021. At March 31, 2021, there remained $889.9 million of borrowing availability. As of March 31, 2021 and December 31, 2020, the FHLB has issued for the benefit of the Bank irrevocable letters of credit with outstanding balances of $749 million and $1.3 billion, respectively. The FHLB letters of credit are variable letters of credit in favor of municipal customers to secure certain deposits. Of the $749 million in letters of credit, $291 million expired on April 15, 2021, $377 million will expire on June 30, 2021, and the remaining $81 million will expire on December 31, 2021.

Other Noninterest Income and Ot

Other Noninterest Income and Other Noninterest Expense	3 Months Ended
	Mar. 31, 2021
Other Nonoperating Income Expense [Abstract]
Other Noninterest Income and Other Noninterest Expense	Note 7—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) 2021 2020 Other noninterest income Insurance revenue $ 270 $ 249 Income from bank owned life insurance policies 1,574 1,328 Other 4,688 (577 ) Total other noninterest income $ 6,532 $ 1,000 Three Months Ended March 31, (In thousands) 2021 2020 Other noninterest expenses Data processing expense $ 3,259 $ 3,352 Software amortization 4,507 3,547 Consulting and professional fees 3,233 2,707 Loan related expenses 796 760 FDIC insurance 1,465 2,436 Communications 1,243 1,156 Advertising and public relations 927 1,464 Legal expenses 925 411 Other 9,037 11,636 Total other noninterest expenses $ 25,392 $ 27,469

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Note 8—Income Taxes Income tax expense (benefit) for the three months ended March 31, 2021 was $30.5 million compared to a benefit of $(33.2) 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, 2021, we had a net deferred tax asset of $72.1 million, compared to $63.7 million at December 31, 2020. The increase in the net deferred asset was primarily due to the tax effect of the decrease in unrealized gains on securities available-for-sale, partially mitigated by the income tax effects of the release for credit losses recorded in the first quarter of 2021.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Note 9—Earnings Per Common Share The following table displays a reconciliation of the information used in calculating basic and diluted net income (loss) per common share for the three months ended March 31, 2021 and 2020. Three Months Ended March 31, (In thousands, except share and per share data) 2021 2020 Net income (loss) per consolidated statements of operations $ 106,425 $ (399,311 ) Net income allocated to participating securities (596 ) — Net income (loss) allocated to common stock $ 105,829 $ (399,311 ) Weighted average common shares outstanding (Basic) 125,079,250 126,630,446 Weighted average dilutive restricted stock units and warrants 542,258 — Weighted average common shares outstanding (Diluted) 125,621,508 126,630,446 Earnings (loss) per common share (Basic) $ 0.85 $ (3.15 ) Earnings (loss) per common share (Diluted) $ 0.84 $ (3.15 ) T he effect from the assumed exercise of 171,483 and 2,512,524 stock options and restricted stock units for the three months ended March 31, 2021 and 2020, respectively, was 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, 2021
Banking And Thrifts [Abstract]
Regulatory Matters	Note 10—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). During 2020, the federal banking agencies issued a 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 the strains on the U.S economy due to COVID-19, while also maintaining the quality of regulatory capital. Under the final rule, 100% of the CECL Day 1 impact and 25% of subsequent provisions for credit losses (“Day 2” impacts) are deferred over a two-year year period ending January 1, 2022, at which time this deferred amount will be phased in on a pro rata basis over a three-year period ending January 2025. The actual capital ratios for the Company and the Bank as of March 31, 2021 and December 31, 2020 are presented in the following table 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, 2021 that would change this designation. Consolidated Company Bank March 31, 2021 December 31, 2020 March 31, 2021 December 31, 2020 Tier 1 leverage 10.9 % 10.9 % 11.0 % 11.3 % Common equity tier 1 capital 14.2 14.0 14.0 14.1 Tier 1 risk-based capital 14.2 14.0 14.3 14.5 Total risk-based capital 16.7 16.7 15.8 15.9 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 effects of the recognition of the non-cash goodwill impairment charge in the first quarter of 2020 to the Bank’s retained profits and the net loss incurred in the second quarter of 2020, the Bank is currently required to seek prior approval of the OCC to pay dividends to the holding company. 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. Additionally, on July 24, 2020, the Federal Reserve amended its supervisory guidance and regulations addressing dividends from bank holding companies to require consultation with the Federal Reserve prior to paying a dividend that exceeds earnings for the period for which the dividend is being paid. The holding company had $183.5 million in cash on hand as of March 31, 2021, and has $50 million in senior debt maturing in June 2021

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 11—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, 2021 December 31, 2020 Commitments to extend credit $ 4,450,271 $ 4,344,268 Commitments to grant loans 285,863 154,507 Standby letters of credit 216,011 216,741 Performance letters of credit 17,032 16,065 Commercial letters of credit 20,832 21,156 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, 2021 and 2020. The Company makes investments in limited partnerships, including certain low-income housing partnerships for which tax credits are received. As of March 31, 2021 and December 31, 2020, 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.

Disclosure About Fair Values of

Disclosure About Fair Values of Financial Instruments	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Disclosure About Fair Values of Financial Instruments	Note 12—Disclosure About Fair Values of Financial Instruments See Note 17 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2020 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, 2021 and December 31, 2020: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2021 Assets Investment securities available-for-sale $ 3,918,666 $ — $ 3,918,666 $ — Derivative assets 36,809 — 36,809 — Other assets 40,693 — — 40,693 Total recurring basis measured assets $ 3,996,168 $ — $ 3,955,475 $ 40,693 Liabilities Derivative liabilities $ 13,146 $ — $ 13,146 $ — Total recurring basis measured liabilities $ 13,146 $ — $ 13,146 $ — (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2020 Assets Investment securities available-for-sale $ 3,332,168 $ — $ 3,332,168 $ — Derivative assets 56,977 — 56,977 — Other assets 38,758 — — 38,758 Total recurring basis measured assets $ 3,427,903 $ — $ 3,389,145 $ 38,758 Liabilities Derivative liabilities $ 15,000 $ — $ 15,000 $ — Total recurring basis measured liabilities $ 15,000 $ — $ 15,000 $ — 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, 2021 and 2020 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 statements of operations) 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, 2021 2020 2021 2020 2021 2020 (In thousands) Net Profits Interests Investments in Limited Partnerships SBA Servicing Rights Beginning Balance $ 3,282 $ 4,330 $ 30,902 $ 18,742 $ 4,574 $ 3,811 Originations — — — — 387 299 Net (losses) gains included in earnings — (259 ) 1,785 (316 ) (30 ) (168 ) Reclassifications — — (2 ) 525 — — Contributions paid — — 1,807 1,283 — — Distributions received — — (2,012 ) (449 ) — — Ending Balance $ 3,282 $ 4,071 $ 32,480 $ 19,785 $ 4,931 $ 3,942 Net unrealized (losses) gains included in earnings relating to assets held at the end of the period $ — $ (259 ) $ 1,785 $ (316 ) $ (30 ) $ (168 ) 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, 2021 and December 31, 2020, 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, 2021 Loans held for sale $ 46,696 $ — $ 46,696 $ — Individually evaluated loans, net of allocated allowance for credit losses 67,268 — — 67,268 Other real estate and repossessed assets 6,255 — 6,255 Total assets measured on a nonrecurring basis $ 120,219 $ — $ 46,696 $ 73,523 (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2020 Loans held for sale $ 47,018 $ — $ 47,018 $ — Individually evaluated loans, net of allocated allowance for credit losses 87,084 — — 87,084 Other real estate 6,517 — — 6,517 Total assets measured on a nonrecurring basis $ 140,619 $ — $ 47,018 $ 93,601 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 (1) March 31, 2021 Individually evaluated loans, net of allowance for credit losses $ 67,268 Appraised value, as adjusted Discount to fair value 0% - 104% 26% Enterprise value Comparables and average multiplier 1.8x - 6.7x 6.23x Enterprise value Discount rates and comparables 9%-13% 11% Other real estate and repossessed assets 6,255 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 Weighted Average (1) December 31, 2020 Individually evaluated loans, net of allowance for credit losses $ 87,084 Appraised value, as adjusted Discount to fair value 0% - 72% 32% Discounted cash flow Discount rate 3.75% - 3.91% 4% Enterprise value Comparables and average multiplier 4.5x - 6.47x 4.95x Enterprise value Discount rates and comparables 9%-15% 12% Other real estate and repossessed assets 6,517 Appraised value, as adjusted Discount to fair value 0% - 20% 10% Estimated closing costs 10% 10% (1) The estimated fair values of the Company’s financial instruments are as follows: March 31, 2021 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 205,425 $ 205,425 $ 205,425 $ — $ — Interest-bearing deposits in other banks 1,680,087 1,680,087 1,680,087 — — Federal funds sold 3,006 3,006 3,006 — — Investment securities available-for-sale 3,918,666 3,918,666 — 3,918,666 — Loans held for sale 69,858 69,858 — 69,858 — Net loans 12,057,297 12,165,321 — — 12,165,321 Derivative assets 36,809 36,809 — 36,809 — Other assets 94,579 94,579 — — 94,579 Financial Liabilities: Deposits 16,129,199 16,134,499 — 16,134,499 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,994 50,264 — 50,264 — Subordinated debt 143,575 154,412 — 154,412 — Junior subordinated debentures 37,694 44,219 — 44,219 — Notes payable 1,721 1,721 — 1,721 — Derivative liabilities 13,146 13,146 — 13,146 — December 31, 2020 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 283,261 $ 283,261 $ 283,261 $ — $ — Interest-bearing deposits in other banks 1,768,847 1,768,847 1,768,847 — — Federal funds sold 1,838 1,838 1,838 — — Investment securities available-for-sale 3,332,168 3,332,168 — 3,332,168 — Loans held for sale 47,018 47,018 — 47,018 — Net loans 12,351,969 12,529,458 — — 12,529,458 Derivative assets 56,977 56,977 — 56,977 — Other assets 96,838 96,838 — — 96,838 Financial Liabilities: Deposits 16,052,245 16,059,358 — 16,059,358 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,986 50,439 — 50,439 — Subordinated debt 183,344 191,438 — 191,438 — Junior subordinated debentures 37,637 42,745 — 42,745 — Notes payable 1,702 1,702 — 1,702 — Derivative liabilities 15,000 15,000 — 15,000 —

Variable Interest Entities and

Variable Interest Entities and Other Investments	3 Months Ended
	Mar. 31, 2021
Variable Interest Entities And Other Investments [Abstract]
Variable Interest Entities and Other Investments	Note 13—Variable Interest Entities and Other Investments 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 a VIE but that consolidation is not required, as the Bank is not the primary beneficiary. At March 31, 2021 and December 31, 2020, 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, 2021 and December 31, 2020, the Company had recorded investments in other assets on its consolidated balance sheets of approximately $30.7 million Additionally, the Company invests in other certain limited partnerships accounted for under the fair value practical expedient of net asset value totaling $32.5 million and $30.9 million as of March 31, 2021 and December 31, 2020, respectively. The company recognized $1.8 million in gains $0.3 million The following table presents a summary of the Company’s investments in limited partnerships (In thousands) March 31, 2021 December 31, 2020 Affordable housing projects (amortized cost) $ 30,665 $ 31,541 Limited partnerships accounted for under the fair value practical expedient of NAV 32,480 30,902 Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method 4,559 7,105 Limited partnerships required to be accounted for under the equity method 14,136 14,646 Total investments in limited partnerships $ 81,840 $ 84,194 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, 2021 and December 31, 2020, there were no downward and upward adjustments to these investments for impairments or price changes from observable transactions. However, in 2020, there was one investment determined to be fully impaired and a $1.9 million charge was recognized. The carrying amount of equity investments measured under the measurement alternative are as follows: For the Three Months Ended March 31, (In thousands) 2021 2020 Carrying value, Beginning of Year $ 7,105 $ 8,681 Reclassifications 2,821 (525 ) Distributions (5,941 ) (215 ) Contributions 574 300 Carrying value, End of Period $ 4,559 $ 8,241 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 a VIE but that consolidation is not required as the Bank is not the primary beneficiary. The net profits interests are financial instruments and recorded at estimated fair value, which was $3.3 million at both March 31, 2021 and December 31, 2020, 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. The amount of rabbi trust assets and benefit obligation was $4.1 million and $4.0 million at March 31, 2021 and December 31, 2020,

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment Reporting	Note 14—Segment Reporting The Company evaluates performance and allocates resources based on profit or loss from operations. Information on the reportable segments is discussed in Note 19 of the Annual Report on Form 10-K for the year ended December 31, 2020. There are no material inter-segment sales or transfers. During the first quarter of 2020, the Company recognized a $443.7 non-cash goodwill impairment charge representing all of the goodwill allocated to the Banking segment. 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, 2020. 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, 2021 and 2020: Three Months Ended March 31, 2021 (In thousands) Banking Financial Services Corporate Consolidated Net interest income (expense) $ 146,119 $ (47 ) $ (3,324 ) $ 142,748 Provision (release) for credit losses (48,262 ) — — (48,262 ) Noninterest income 30,071 13,261 364 43,696 Noninterest expense 86,867 9,329 1,626 97,822 Income tax expense (benefit) 32,153 386 (2,080 ) 30,459 Net income (loss) $ 105,432 $ 3,499 $ (2,506 ) $ 106,425 Total assets $ 18,698,902 $ 92,374 $ 9,074 $ 18,800,350 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

Equity-based Compensation

Equity-based Compensation	3 Months Ended
	Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-based Compensation	Note 15—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 3.8 million at March 31, 2021. Restricted Stock Units During the three months ended March 31, 2021 and 2020, the Company did not grant any shares of stock-based awards in the form of restricted stock units (“RSU”) 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, 2021 2020 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 1,617,945 $ 14.35 1,229,863 $ 19.97 Granted during the period — — — — Vested during the period (363,495 ) 14.63 (160,668 ) 20.55 Forfeited during the period (118,049 ) 23.72 (56,429 ) 20.20 Non-vested at end of period 1,136,401 $ 13.28 1,012,766 $ 19.86 The RSU granted include both time and performance-based components. The following table summarizes the vesting schedule for the time-based RSU granted that remain unvested at March 31, 2021: Quarter Ending Annual Vesting Quarterly Vesting Cliff Vesting June 30, 2021 1,000 September 30, 2021 962 March 31, 2022 24,282 138,652 21,653 March 31, 2023 96,989 June 30, 2023 5,252 September 30, 2023 7,426 March 31, 2024 544,361 June 30, 2024 9,200 September 30, 2024 10,000 While the grants of performance-based RSU specify a stated target number of units, the determination of the actual number of shares to be issued will be based on the achievement of certain financial performance measures of the Company. These performance conditions will determine the actual number of shares to be issued and can be in the range of 0% to 200% of the target number of performance-based RSU granted. RSU include rights as a shareholder in the form of dividend equivalents. Dividend equivalents for time-based RSU will be paid on each dividend payment date for the Company; dividend equivalents for the performance-based RSU will be accrued and paid on the number of earned shares once the performance level is determined and the corresponding number of shares are issued. The fair value of the RSU was estimated based upon the fair value of the underlying shares on the date of the grant. The Company recorded $2.2 million of equity-based compensation expense for the outstanding restricted stock units for the three months ended March 31, 2021, compared to $1.1 million for the three months ended March 31, 2020. The remaining expense related to unvested restricted stock units is $11.3 million as of March 31, 2021 and will be recognized over service periods ranging from 3 months to 42 months. Stock Options During the first quarter of 2019, the Company granted 1,602,848 stock options to certain executive officers. The options were granted at an exercise price equal to a 15% premium to the fair value of the Company’s Class A 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 uses the Black-Scholes option pricing model to estimate the fair value of the stock options. See Note 20 to the consolidated financial statements of our Annual Report on Form 10-K for the year ended December 31, 2020 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 last day 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 shares to the employee. There were 20,212 shares of Class A common stock purchased in the open market by the ESPP during the three months ended March 31, 2021, compared to 67,844 shares during the three months ended March 31, 2020, which resulted in compensation expense of $75 thousand and $14 thousand for the three months ended March 31, 2021 and 2020, respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Note 16—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, 2021 and 2020. Three Months Ended March 31, 2021 (In thousands) Unrealized gains (losses) on securities available-for-sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Accumulated other comprehensive income (loss) Balance at December 31, 2020 $ 65,594 $ 44,492 $ 110,086 Net change (68,810 ) (18,077 ) (86,887 ) Balance at March 31, 2021 $ (3,216 ) $ 26,415 $ 23,199 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 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

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Note 17—Subsequent Events On April 12, 2021, Cadence Bancorporation, a Delaware corporation (“Cadence”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with BancorpSouth Bank, a Mississippi-chartered bank (“BancorpSouth”), and Cadence’s bank subsidiary, Cadence Bank, N.A., a national association (“Cadence Bank”) entered into a related bank-level Agreement and Plan of Merger (the “Bank Merger Agreement”) with BancorpSouth, pursuant to which BancorpSouth and Cadence have agreed to effect a merger-of-equals transaction. The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, Cadence will merge with and into BancorpSouth (the “Merger”), with BancorpSouth continuing as the surviving entity. Immediately following the Merger, or at such later time as the parties may mutually agree, Cadence Bank will merge with and into BancorpSouth (the “Bank Merger”), with BancorpSouth continuing as the surviving entity. The Merger Agreement and the Bank Merger Agreement were unanimously approved by the Board of Directors of each of BancorpSouth and Cadence. The main office and bank headquarters of the combined company will be located in Tupelo, Mississippi and the corporate headquarters of the combined company will be located in Houston, Texas. The Chief Executive Officer and the Executive Vice Chairman of the combined company will maintain their respective principal offices in Tupelo, Mississippi and Houston, Texas. The name of the surviving entity will be Cadence Bank. For more information regarding the pending merger with BancorpSouth, see the Current Reports on Form 8-K filed with the SEC on April 12, 2021 and April 16, 2021. On April 22, 2021, the Board of Directors of Cadence Bancorporation declared a quarterly cash dividend in the amount of $0.15 per share of outstanding common stock, representing an annualized dividend of $0.60 per share. The dividend will be paid on May 14, 2021 to holders of record of Cadence’s Class A common stock on May 7, 2021.

Summary of Accounting Policies

Summary of Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
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, 2020. Operating results for the period ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The Company and its subsidiaries follow GAAP, 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 13). Certain amounts reported in prior years have been reclassified to conform to the 2021 presentation. These reclassifications did not materially impact the Company’s consolidated balance sheets or consolidated statements of operations. In accordance with
Pronouncements Adopted During the Three Months Ended March 31, 2021 and Pending Accounting Pronouncements	Pronouncements adopted during the three months ended March 31, 2021 ASU No. 2019-12 In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes The Company adopted this guidance on January 1, 2021, with no material impact on the consolidated financial statements. ASU No. 2020-01 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) The Company adopted this guidance on January 1, 2021, with no material impact on the consolidated financial statements. ASU No. 2020-08 In October 2020, the FASB issued ASU No. 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs The Company adopted this guidance on January 1, 2021 . As Cadence does not currently own any callable bonds at a premium, the adoption of this guidance ha d no immediate impact on our consolidated financial statements. ASU No. 2020-10 In October 2020, the FASB issued ASU No. 2020-10, Codification Improvements The Company adopted this guidance on January 1, 2021. The amendments in this Update did not change GAAP and, therefore, did not have a material impact on the consolidated financial statements. ASU No. 2021-01 In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848): Scope. This guidance was effective for all entities upon issuance and generally can be applied through December 31, 2022, similar to existing relief provided under ASC 848. Entities may elect to apply the guidance on contract modifications either (1) retrospectively as of any date from the beginning of any interim period that includes March 12, 2020 or (2) prospectively to new modifications from any date in an interim period that includes or is after January 7, 2021, up to the date that financial statements are available to be issued. Entities may elect to apply the guidance on hedge accounting to eligible hedging relationships that existed as of the beginning of an interim period that includes March 12, 2020 and to those entered into after the beginning of the interim period that includes that date. The adoption of this guidance had no immediate impact on our consolidated financial statements. Pending Accounting Pronouncements ASU No. 2020-06 In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity The guidance is effective for annual periods beginning after December 15, 2021, and interim periods within those fiscal years. The FASB specified that an entity should adopt the guidance as of the beginning of its annual fiscal year. As Cadence does not currently have any convertible debt or hedging contracts in our own equity, this guidance will have no impact on our consolidated financial statements.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020 is as follows: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value March 31, 2021 Securities available-for-sale: Obligations of U.S. government agencies $ 309,194 $ 426 $ 13,241 $ 296,379 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 131,472 1,947 477 132,942 Issued by FNMA and FHLMC 2,440,906 28,093 31,160 2,437,839 Other residential mortgage-backed securities 209,464 4,285 2,386 211,363 Commercial mortgage-backed securities 433,408 4,741 9,532 428,617 Total MBS 3,215,250 39,066 43,555 3,210,761 Obligations of states and municipal subdivisions 351,103 12,220 1,944 361,379 Foreign debt security 50,000 147 — 50,147 Total securities available-for-sale $ 3,925,547 $ 51,859 $ 58,740 $ 3,918,666 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value December 31, 2020 Securities available-for-sale: Obligations of U.S. government agencies $ 289,565 $ 1,281 $ 2,117 $ 288,729 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 122,366 3,029 60 125,335 Issued by FNMA and FHLMC 1,870,399 47,020 530 1,916,889 Other residential mortgage-backed securities 211,860 5,143 348 216,655 Commercial mortgage-backed securities 420,700 13,110 2,033 431,777 Total MBS 2,625,325 68,302 2,971 2,690,656 Obligations of states and municipal subdivisions 334,177 18,610 4 352,783 Total securities available-for-sale $ 3,249,067 $ 88,193 $ 5,092 $ 3,332,168
Schedule of Contractual Maturities of Securities Available-for-Sale	The scheduled contractual maturities of securities available-for-sale at March 31, 2021 were as follows: Amortized Estimated (In thousands) Cost Fair Value Due in one year or less $ — $ — Due after one year through five years 933 925 Due after five years through ten years 168,331 167,763 Due after ten years 541,033 539,217 Mortgage-backed securities 3,215,250 3,210,761 Total $ 3,925,547 $ 3,918,666
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, 2021 and 2020 are presented below. For the Three Months Ended March 31, (In thousands) 2021 2020 Gross realized gains $ 2,261 $ 2,994 Gross realized losses 2 — Realized gains (losses), net $ 2,259 $ 2,994
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, 2021 Obligations of U.S. government agencies $ 229,306 $ 12,998 $ 28,764 $ 243 Mortgage-backed securities 1,887,482 43,307 31,169 248 Obligations of states and municipal subdivisions 82,175 1,944 — — Total $ 2,198,963 $ 58,249 $ 59,933 $ 491 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, 2020 Obligations of U.S. government agencies $ 151,172 $ 1,868 $ 30,658 $ 249 Mortgage-backed securities 360,197 2,832 18,476 139 Obligations of states and municipal subdivisions 841 4 — — Total $ 512,210 $ 4,704 $ 49,134 $ 388

Loans Held for Sale, Loans an_2

Loans Held for Sale, Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020. (In thousands) March 31, 2021 December 31, 2020 Commercial and industrial $ 39,014 $ 33,339 Commercial real estate 474 780 Consumer 7,208 12,899 Total loans held for sale (1) $ 46,696 $ 47,018 (1) $0.1
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, 2021 and December 31, 2020. Outstanding balances include originated loans, Acquired Noncredit Impaired (“ANCI”) loans, and Purchase Credit Deteriorated (“PCD”) loans. (In thousands) March 31, 2021 December 31, 2020 Commercial and industrial General C&I $ 4,189,775 $ 4,421,286 Energy 1,287,406 1,310,612 Restaurant 924,314 971,662 Healthcare 526,552 547,491 Total commercial and industrial 6,928,047 7,251,051 Commercial real estate Industrial, retail, and other 1,723,545 1,683,975 Multifamily 804,495 776,494 Office 445,130 452,639 Total commercial real estate 2,973,170 2,913,108 Consumer Residential 2,375,017 2,452,865 Other 89,100 102,105 Total consumer 2,464,117 2,554,970 Total (1) $ 12,365,334 $ 12,719,129 (1) $47.6 million and $47.0 million of net accrued interest receivable is excluded from the total loan balances above as of March 31, 2021 and December 31, 2020, respectively.
Summary of PPP Loans by Portfolio Segment and Class of Financing Receivable	The following table presents the Company’s PPP loans by portfolio segment and class of financing receivable as of March 31, 2021 and December 31, 2020. March 31, 2021 December 31, 2020 (In thousands) Amortized Cost % of PPP Portfolio Amortized Cost % of PPP Portfolio Commercial and industrial General C&I $ 555,274 68.8 % $ 648,458 69.1 % Energy 67,512 8.4 76,228 8.1 Restaurant 119,662 14.8 134,454 14.4 Healthcare 64,897 8.0 79,120 8.4 Total PPP loans $ 807,345 100.0 % $ 938,260 100.0 % As a % of total loans 6.5 % 7.4 %
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, 2021 and 2020 . For the Three Months Ended March 31, 2021 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Total Allowance for Credit Losses Reserve for Unfunded Commitments (1) Total As of December 31, 2020 $ 187,365 $ 141,187 $ 38,608 $ 367,160 $ 2,296 $ 369,456 Provision (release) for credit losses (9,594 ) (29,481 ) (7,940 ) (47,015 ) (1,247 ) (48,262 ) Charge-offs (14,124 ) (401 ) (146 ) (14,671 ) — (14,671 ) Recoveries 1,724 105 734 2,563 — 2,563 As of March 31, 2021 $ 165,371 $ 111,410 $ 31,256 $ 308,037 $ 1,049 $ 309,086 Allocation of ending ACL Loans collectively evaluated $ 139,542 $ 111,410 $ 31,256 $ 282,208 Loans individually evaluated 25,829 — — 25,829 ACL as of March 31, 2021 $ 165,371 $ 111,410 $ 31,256 $ 308,037 Loans (amortized cost) Loans collectively evaluated $ 6,849,604 $ 2,960,299 $ 2,462,334 $ 12,272,237 Loans individually evaluated 78,443 12,871 1,783 93,097 Loans as of March 31, 2021 (2) $ 6,928,047 $ 2,973,170 $ 2,464,117 $ 12,365,334 (1) The reserve for unfunded commitments is included in other liabilities on the consolidated balance sheets. (2) $47.6 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021. 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. (2) $45.3 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2020.
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, 2021. 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 2021 vintage relate to credits in resolution. Amortized Cost Basis by Origination Year Revolving Credits (In thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Loans Converted to Term Loans Total Commercial and industrial Pass $ 285,913 $ 1,472,441 $ 539,095 $ 752,344 $ 537,347 $ 786,593 $ 1,909,311 $ 45,200 $ 6,328,244 Special mention — 272 24,948 11,555 202 8,783 120,640 23 166,423 Substandard 22 51,601 19,085 97,720 39,644 80,720 108,406 10,353 407,551 Doubtful — — — 7,188 188 5,291 13,162 — 25,829 Total commercial and industrial 285,935 1,524,314 583,128 868,807 577,381 881,387 2,151,519 55,576 6,928,047 Commercial real estate Pass 47,324 504,746 551,851 634,135 405,782 514,103 113,040 — 2,770,981 Special mention — 746 42 23,060 30,382 7,668 194 — 62,092 Substandard 93 — 14,683 19,171 38,522 67,344 284 — 140,097 Doubtful — — — — — — — — — Total commercial real estate 47,417 505,492 566,576 676,366 474,686 589,115 113,518 — 2,973,170 Consumer Current 98,961 460,461 384,968 447,624 231,131 586,505 227,281 — 2,436,931 30-59 days past due — 365 1,161 2,391 133 9,171 713 — 13,934 60-89 days past due — — 353 2,268 88 2,313 176 — 5,198 90+ days past due — — 1,233 2,620 294 3,907 — — 8,054 Total consumer 98,961 460,826 387,715 454,903 231,646 601,896 228,170 — 2,464,117 Total (1) $ 432,313 $ 2,490,632 $ 1,537,419 $ 2,000,076 $ 1,283,713 $ 2,072,398 $ 2,493,207 $ 55,576 $ 12,365,334 (1) $47.6 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021.
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, 2021 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 $ 6,295 $ 1,090 $ 8,543 $ 15,928 $ 4,173,847 $ 4,189,775 $ 25 Energy — — 1,642 1,642 1,285,764 1,287,406 — Restaurant 642 9,359 5,662 15,663 908,651 924,314 — Healthcare 1,172 181 469 1,822 524,730 526,552 — Total commercial and industrial 8,109 10,630 16,316 35,055 6,892,992 6,928,047 25 Commercial real estate Industrial, retail, and other 13,345 11,226 2,024 26,595 1,696,950 1,723,545 — Multifamily — — — — 804,495 804,495 — Office 1,400 1,467 7,202 10,069 435,061 445,130 — Total commercial real estate 14,745 12,693 9,226 36,664 2,936,506 2,973,170 — Consumer Residential 13,439 5,094 8,021 26,554 2,348,463 2,375,017 1,341 Other 495 104 33 632 88,468 89,100 33 Total consumer 13,934 5,198 8,054 27,186 2,436,931 2,464,117 1,374 Total $ 36,788 $ 28,521 $ 33,596 $ 98,905 $ 12,266,429 $ 12,365,334 $ 1,399 (1) $47.6 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021. Age Analysis of Past-Due Loans as of December 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 $ 4,609 $ 11,653 $ 16,301 $ 32,563 $ 4,388,723 $ 4,421,286 $ 9,130 Energy — — 1,691 1,691 1,308,921 1,310,612 — Restaurant 7,561 302 5,283 13,146 958,516 971,662 — Healthcare 21 229 354 604 546,887 547,491 — Total commercial and industrial 12,191 12,184 23,629 48,004 7,203,047 7,251,051 9,130 Commercial real estate Industrial, retail, and other 12,619 2,884 2,647 18,150 1,665,825 1,683,975 125 Multifamily — 198 — 198 776,296 776,494 — Office 408 — 7,258 7,666 444,973 452,639 — Total commercial real estate 13,027 3,082 9,905 26,014 2,887,094 2,913,108 125 Consumer Residential 16,971 3,695 12,375 33,041 2,419,824 2,452,865 4,625 Other 179 5 — 184 101,921 102,105 — Total consumer 17,150 3,700 12,375 33,225 2,521,745 2,554,970 4,625 Total $ 42,368 $ 18,966 $ 45,909 $ 107,243 $ 12,611,886 $ 12,719,129 $ 13,880 (1) $47.0 million of net accrued interest receivable is excluded from the loan balances above as of December 31, 2020.
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, 2021. Nonaccrual Loans - Amortized Cost (1) 90+ Days (In thousands) December 31, 2020 March 31, 2021 No Allowance Recorded Past Due and Accruing (2) Interest Income Recognized Commercial and industrial General C&I $ 34,363 $ 21,222 $ 3,150 $ 25 $ 26 Energy 20,241 34,212 1,642 — 1 Restaurant 53,856 37,873 9,430 — 1 Healthcare 951 846 — — 497 Total commercial and industrial 109,411 94,153 14,222 25 525 Commercial real estate Industrial, retail, and other 7,301 6,177 3,624 — 86 Multifamily — — — — — Office 7,258 8,669 8,587 — 71 Total commercial real estate 14,559 14,846 12,211 — 157 Consumer Residential 14,028 14,361 1,096 1,341 114 Other 4 3 — 33 2 Total consumer 14,032 14,364 1,096 1,374 116 Total $ 138,002 $ 123,363 $ 27,529 $ 1,399 $ 798 (1) Nonperforming loans do not include nonperforming loans held for sale of $3.4 million and $0.2 million at March 31, 2021 and December 31, 2020, respectively (2) Less than $0.1 million of net accrued interest receivable is excluded from the loan balances above as of March 31, 2021.
Summary of Information Regarding Loans and Types of Loan Modified into TDRs	The following table provides information regarding loans that were modified as TDRs during the periods indicated. For the Three Months Ended March 31, 2021 2020 (Dollars in thousands) Number of TDRs Amortized Cost (1) Number of TDRs Amortized Cost (1) Commercial and industrial General C&I — $ — 4 $ 33,339 Energy — — 1 8,105 Restaurant — — 2 24,247 Commercial real estate Industrial, retail, and other 1 2,362 — — Total 1 $ 2,362 7 $ 65,691 (1) There was zero and less than $0.1 million of net accrued interest receivable recorded on the loan balances above as of March 31, 2021 and 2020, respectively. 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, 2021 2020 Number of Loans Modified by: Rate Concession Modified Terms and/or Other Concessions Rate Concession Modified Terms and/or Other Concessions Commercial and industrial General C&I — — — 4 Energy — — 1 — Restaurant — — — 2 Commercial real estate Industrial, retail, and other — 1 — — Total — 1 1 6

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020 were as follows: March 31, 2021 December 31, 2020 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 $ 11,744 $ — $ 350,000 $ 22,560 $ — Total derivatives designated as hedging instruments 350,000 11,744 — 350,000 22,560 — Derivatives not designated as hedging instruments: Commercial loan interest rate swaps 1,188,783 13,916 2,503 1,200,581 20,699 1,647 Commercial loan interest rate caps 177,747 10 10 162,479 4 4 Commercial loan interest rate floors 551,412 9,654 9,654 560,048 11,986 11,986 Commercial loan interest rate collars 64,442 150 150 66,665 305 305 Mortgage loan held-for-sale interest rate lock commitments 26,126 249 — 33,458 531 — Mortgage loan forward sale commitments 8,021 100 — 11,081 112 — Mortgage loan held-for-sale floating commitments 4,746 — — 4,206 — — Foreign exchange contracts 67,500 986 829 89,707 780 1,058 Total derivatives not designated as hedging instruments 2,088,777 25,065 13,146 2,128,225 34,417 15,000 Total derivatives $ 2,438,777 $ 36,809 $ 13,146 $ 2,478,225 $ 56,977 $ 15,000
Schedule of Gains (Losses) in Consolidated Statements of Operations Related to Derivatives Designated as Hedging Instruments	Pre-tax For the Three Months Ended March 31, 2021 2020 (In thousands) OCI Reclassified from AOCI to interest income OCI Reclassified from AOCI to interest income Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ (9,532 ) $ 1,284 $ 24,035 $ (106 ) Commercial loan interest rate collars — 12,812 143,198 8,213

Borrowed Funds (Tables)

Borrowed Funds (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Summary of Debt	Our outstanding senior and subordinated debt consists of the following: (In thousands) March 31, 2021 December 31, 2020 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 3-month LIBOR plus 4.884%, subordinated notes, due March 11, 2025, callable in 2020 — 40,000 4.750% subordinated notes, due June 30, 2029, callable in 2024 85,000 85,000 Total — Cadence Bancorporation 170,000 210,000 Cadence Bank: 6.250% subordinated notes, due June 28, 2029, callable in 2024 25,000 25,000 Debt issue costs and unamortized premium (1,430 ) (1,670 ) Total senior and subordinated debt $ 193,570 $ 233,330
Summary of Junior Subordinated Debt	Our junior subordinated debt consists of the following: (In thousands) March 31, 2021 December 31, 2020 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 (12,925 ) (12,982 ) Total junior subordinated debentures $ 37,694 $ 37,637

Other Noninterest Income and _2

Other Noninterest Income and Other Noninterest Expense (Tables)	3 Months Ended
	Mar. 31, 2021
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) 2021 2020 Other noninterest income Insurance revenue $ 270 $ 249 Income from bank owned life insurance policies 1,574 1,328 Other 4,688 (577 ) Total other noninterest income $ 6,532 $ 1,000 Three Months Ended March 31, (In thousands) 2021 2020 Other noninterest expenses Data processing expense $ 3,259 $ 3,352 Software amortization 4,507 3,547 Consulting and professional fees 3,233 2,707 Loan related expenses 796 760 FDIC insurance 1,465 2,436 Communications 1,243 1,156 Advertising and public relations 927 1,464 Legal expenses 925 411 Other 9,037 11,636 Total other noninterest expenses $ 25,392 $ 27,469

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Net Income (Loss) Per Common Share	The following table displays a reconciliation of the information used in calculating basic and diluted net income (loss) per common share for the three months ended March 31, 2021 and 2020. Three Months Ended March 31, (In thousands, except share and per share data) 2021 2020 Net income (loss) per consolidated statements of operations $ 106,425 $ (399,311 ) Net income allocated to participating securities (596 ) — Net income (loss) allocated to common stock $ 105,829 $ (399,311 ) Weighted average common shares outstanding (Basic) 125,079,250 126,630,446 Weighted average dilutive restricted stock units and warrants 542,258 — Weighted average common shares outstanding (Diluted) 125,621,508 126,630,446 Earnings (loss) per common share (Basic) $ 0.85 $ (3.15 ) Earnings (loss) per common share (Diluted) $ 0.84 $ (3.15 )

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2021
Banking And Thrifts [Abstract]
Schedule of Actual Capital Ratios for Company and Bank	The actual capital ratios for the Company and the Bank as of March 31, 2021 and December 31, 2020 are presented in the following table 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, 2021 that would change this designation. Consolidated Company Bank March 31, 2021 December 31, 2020 March 31, 2021 December 31, 2020 Tier 1 leverage 10.9 % 10.9 % 11.0 % 11.3 % Common equity tier 1 capital 14.2 14.0 14.0 14.1 Tier 1 risk-based capital 14.2 14.0 14.3 14.5 Total risk-based capital 16.7 16.7 15.8 15.9

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Summary of Commitments and Contingent Liabilities	A summary of commitments and contingent liabilities is as follows: (In thousands) March 31, 2021 December 31, 2020 Commitments to extend credit $ 4,450,271 $ 4,344,268 Commitments to grant loans 285,863 154,507 Standby letters of credit 216,011 216,741 Performance letters of credit 17,032 16,065 Commercial letters of credit 20,832 21,156

Disclosure About Fair Values _2

Disclosure About Fair Values of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and December 31, 2020: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2021 Assets Investment securities available-for-sale $ 3,918,666 $ — $ 3,918,666 $ — Derivative assets 36,809 — 36,809 — Other assets 40,693 — — 40,693 Total recurring basis measured assets $ 3,996,168 $ — $ 3,955,475 $ 40,693 Liabilities Derivative liabilities $ 13,146 $ — $ 13,146 $ — Total recurring basis measured liabilities $ 13,146 $ — $ 13,146 $ — (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2020 Assets Investment securities available-for-sale $ 3,332,168 $ — $ 3,332,168 $ — Derivative assets 56,977 — 56,977 — Other assets 38,758 — — 38,758 Total recurring basis measured assets $ 3,427,903 $ — $ 3,389,145 $ 38,758 Liabilities Derivative liabilities $ 15,000 $ — $ 15,000 $ — Total recurring basis measured liabilities $ 15,000 $ — $ 15,000 $ —
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, 2021 2020 2021 2020 2021 2020 (In thousands) Net Profits Interests Investments in Limited Partnerships SBA Servicing Rights Beginning Balance $ 3,282 $ 4,330 $ 30,902 $ 18,742 $ 4,574 $ 3,811 Originations — — — — 387 299 Net (losses) gains included in earnings — (259 ) 1,785 (316 ) (30 ) (168 ) Reclassifications — — (2 ) 525 — — Contributions paid — — 1,807 1,283 — — Distributions received — — (2,012 ) (449 ) — — Ending Balance $ 3,282 $ 4,071 $ 32,480 $ 19,785 $ 4,931 $ 3,942 Net unrealized (losses) gains included in earnings relating to assets held at the end of the period $ — $ (259 ) $ 1,785 $ (316 ) $ (30 ) $ (168 ) 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, 2021 and December 31, 2020, 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, 2021 Loans held for sale $ 46,696 $ — $ 46,696 $ — Individually evaluated loans, net of allocated allowance for credit losses 67,268 — — 67,268 Other real estate and repossessed assets 6,255 — 6,255 Total assets measured on a nonrecurring basis $ 120,219 $ — $ 46,696 $ 73,523 (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2020 Loans held for sale $ 47,018 $ — $ 47,018 $ — Individually evaluated loans, net of allocated allowance for credit losses 87,084 — — 87,084 Other real estate 6,517 — — 6,517 Total assets measured on a nonrecurring basis $ 140,619 $ — $ 47,018 $ 93,601
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 (1) March 31, 2021 Individually evaluated loans, net of allowance for credit losses $ 67,268 Appraised value, as adjusted Discount to fair value 0% - 104% 26% Enterprise value Comparables and average multiplier 1.8x - 6.7x 6.23x Enterprise value Discount rates and comparables 9%-13% 11% Other real estate and repossessed assets 6,255 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 Weighted Average (1) December 31, 2020 Individually evaluated loans, net of allowance for credit losses $ 87,084 Appraised value, as adjusted Discount to fair value 0% - 72% 32% Discounted cash flow Discount rate 3.75% - 3.91% 4% Enterprise value Comparables and average multiplier 4.5x - 6.47x 4.95x Enterprise value Discount rates and comparables 9%-15% 12% Other real estate and repossessed assets 6,517 Appraised value, as adjusted Discount to fair value 0% - 20% 10% Estimated closing costs 10% 10% (1)
Summary of Estimated Fair Values of Financial Instruments	The estimated fair values of the Company’s financial instruments are as follows: March 31, 2021 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 205,425 $ 205,425 $ 205,425 $ — $ — Interest-bearing deposits in other banks 1,680,087 1,680,087 1,680,087 — — Federal funds sold 3,006 3,006 3,006 — — Investment securities available-for-sale 3,918,666 3,918,666 — 3,918,666 — Loans held for sale 69,858 69,858 — 69,858 — Net loans 12,057,297 12,165,321 — — 12,165,321 Derivative assets 36,809 36,809 — 36,809 — Other assets 94,579 94,579 — — 94,579 Financial Liabilities: Deposits 16,129,199 16,134,499 — 16,134,499 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,994 50,264 — 50,264 — Subordinated debt 143,575 154,412 — 154,412 — Junior subordinated debentures 37,694 44,219 — 44,219 — Notes payable 1,721 1,721 — 1,721 — Derivative liabilities 13,146 13,146 — 13,146 — December 31, 2020 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 283,261 $ 283,261 $ 283,261 $ — $ — Interest-bearing deposits in other banks 1,768,847 1,768,847 1,768,847 — — Federal funds sold 1,838 1,838 1,838 — — Investment securities available-for-sale 3,332,168 3,332,168 — 3,332,168 — Loans held for sale 47,018 47,018 — 47,018 — Net loans 12,351,969 12,529,458 — — 12,529,458 Derivative assets 56,977 56,977 — 56,977 — Other assets 96,838 96,838 — — 96,838 Financial Liabilities: Deposits 16,052,245 16,059,358 — 16,059,358 — Advances from FHLB 100,000 100,000 — 100,000 — Senior debt 49,986 50,439 — 50,439 — Subordinated debt 183,344 191,438 — 191,438 — Junior subordinated debentures 37,637 42,745 — 42,745 — Notes payable 1,702 1,702 — 1,702 — Derivative liabilities 15,000 15,000 — 15,000 —

Variable Interest Entities an_2

Variable Interest Entities and Other Investments (Tables)	3 Months Ended
	Mar. 31, 2021
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 (In thousands) March 31, 2021 December 31, 2020 Affordable housing projects (amortized cost) $ 30,665 $ 31,541 Limited partnerships accounted for under the fair value practical expedient of NAV 32,480 30,902 Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method 4,559 7,105 Limited partnerships required to be accounted for under the equity method 14,136 14,646 Total investments in limited partnerships $ 81,840 $ 84,194
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) 2021 2020 Carrying value, Beginning of Year $ 7,105 $ 8,681 Reclassifications 2,821 (525 ) Distributions (5,941 ) (215 ) Contributions 574 300 Carrying value, End of Period $ 4,559 $ 8,241

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and 2020: Three Months Ended March 31, 2021 (In thousands) Banking Financial Services Corporate Consolidated Net interest income (expense) $ 146,119 $ (47 ) $ (3,324 ) $ 142,748 Provision (release) for credit losses (48,262 ) — — (48,262 ) Noninterest income 30,071 13,261 364 43,696 Noninterest expense 86,867 9,329 1,626 97,822 Income tax expense (benefit) 32,153 386 (2,080 ) 30,459 Net income (loss) $ 105,432 $ 3,499 $ (2,506 ) $ 106,425 Total assets $ 18,698,902 $ 92,374 $ 9,074 $ 18,800,350 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

Equity-based Compensation (Tabl

Equity-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 2020 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 1,617,945 $ 14.35 1,229,863 $ 19.97 Granted during the period — — — — Vested during the period (363,495 ) 14.63 (160,668 ) 20.55 Forfeited during the period (118,049 ) 23.72 (56,429 ) 20.20 Non-vested at end of period 1,136,401 $ 13.28 1,012,766 $ 19.86
Summary of Vesting Schedule	The RSU granted include both time and performance-based components. The following table summarizes the vesting schedule for the time-based RSU granted that remain unvested at March 31, 2021: Quarter Ending Annual Vesting Quarterly Vesting Cliff Vesting June 30, 2021 1,000 September 30, 2021 962 March 31, 2022 24,282 138,652 21,653 March 31, 2023 96,989 June 30, 2023 5,252 September 30, 2023 7,426 March 31, 2024 544,361 June 30, 2024 9,200 September 30, 2024 10,000

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021 and 2020. Three Months Ended March 31, 2021 (In thousands) Unrealized gains (losses) on securities available-for-sale Unrealized gains (losses) on derivative instruments designated as cash flow hedges Accumulated other comprehensive income (loss) Balance at December 31, 2020 $ 65,594 $ 44,492 $ 110,086 Net change (68,810 ) (18,077 ) (86,887 ) Balance at March 31, 2021 $ (3,216 ) $ 26,415 $ 23,199 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 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

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	$ 3,925,547	$ 3,249,067
Securities available-for-sale, Gross Unrealized Gains	51,859	88,193
Securities available-for-sale, Gross Unrealized Losses	58,740	5,092
Securities available-for-sale, Estimated Fair Value	3,918,666	3,332,168
Obligations of U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	309,194	289,565
Securities available-for-sale, Gross Unrealized Gains	426	1,281
Securities available-for-sale, Gross Unrealized Losses	13,241	2,117
Securities available-for-sale, Estimated Fair Value	296,379	288,729
Residential Pass-through | Guaranteed by GNMA
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	131,472	122,366
Securities available-for-sale, Gross Unrealized Gains	1,947	3,029
Securities available-for-sale, Gross Unrealized Losses	477	60
Securities available-for-sale, Estimated Fair Value	132,942	125,335
Residential Pass-through | Issued by FNMA and FHLMC
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	2,440,906	1,870,399
Securities available-for-sale, Gross Unrealized Gains	28,093	47,020
Securities available-for-sale, Gross Unrealized Losses	31,160	530
Securities available-for-sale, Estimated Fair Value	2,437,839	1,916,889
Other Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	209,464	211,860
Securities available-for-sale, Gross Unrealized Gains	4,285	5,143
Securities available-for-sale, Gross Unrealized Losses	2,386	348
Securities available-for-sale, Estimated Fair Value	211,363	216,655
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	433,408	420,700
Securities available-for-sale, Gross Unrealized Gains	4,741	13,110
Securities available-for-sale, Gross Unrealized Losses	9,532	2,033
Securities available-for-sale, Estimated Fair Value	428,617	431,777
Total MBS
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	3,215,250	2,625,325
Securities available-for-sale, Gross Unrealized Gains	39,066	68,302
Securities available-for-sale, Gross Unrealized Losses	43,555	2,971
Securities available-for-sale, Estimated Fair Value	3,210,761	2,690,656
Obligations of States and Municipal Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	351,103	334,177
Securities available-for-sale, Gross Unrealized Gains	12,220	18,610
Securities available-for-sale, Gross Unrealized Losses	1,944	4
Securities available-for-sale, Estimated Fair Value	361,379	$ 352,783
Foreign debt security
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	50,000
Securities available-for-sale, Gross Unrealized Gains	147
Securities available-for-sale, Estimated Fair Value	$ 50,147

Investment Securities - Schedul

Investment Securities - Schedule of Contractual Maturities of Securities Available-for-Sale (Details) $ in Thousands	Mar. 31, 2021USD ($)
Investments Debt And Equity Securities [Abstract]
Available-for-Sale, Due after one year through five years, Amortized Cost	$ 933
Available-for-Sale, Due after five years through ten years, Amortized Cost	168,331
Available-for-Sale, Due after ten years, Amortized Cost	541,033
Available-for-Sale, Mortgage-backed securities, Amortized Cost	3,215,250
Available-for-Sale, Total, Amortized Cost	3,925,547
Available-for-Sale, Due after one year through five years, Estimated Fair Value	925
Available-for-Sale, Due after five years through ten years, Estimated Fair Value	167,763
Available-for-Sale, Due after ten years, Estimated Fair Value	539,217
Available-for-Sale, Mortgage-backed securities, Estimated Fair Value	3,210,761
Available-for-Sale, Total, Estimated Fair Value	$ 3,918,666

Investment Securities - Additio

Investment Securities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021USD ($)Security	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Schedule Of Available For Sale Securities [Line Items]
Impairment charges	$ 0	$ 0
Percentage of fair value of securities in investment portfolio reflect unrealized loss	58.00%		17.00%
Number of securities in a loss position for more than twelve months | Security	14
Number of securities in a loss position for less than twelve months | Security	196
Allowance for credit losses related to available-for-sale securities	$ 0		$ 0
Collateral Pledged
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged	$ 1,300,000,000		$ 1,300,000,000

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, 2021	Mar. 31, 2020
Investments Debt And Equity Securities [Abstract]
Gross realized gains	$ 2,261	$ 2,994
Gross realized losses	2
Realized gains (losses), net	$ 2,259	$ 2,994

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, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	$ 2,198,963	$ 512,210
Losses less than 12 Months, Gross Unrealized Losses	58,249	4,704
Losses more than 12 Months, Estimated Fair Value	59,933	49,134
Losses more than 12 Months, Gross Unrealized Losses	491	388
Obligations of U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	229,306	151,172
Losses less than 12 Months, Gross Unrealized Losses	12,998	1,868
Losses more than 12 Months, Estimated Fair Value	28,764	30,658
Losses more than 12 Months, Gross Unrealized Losses	243	249
MBS
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	1,887,482	360,197
Losses less than 12 Months, Gross Unrealized Losses	43,307	2,832
Losses more than 12 Months, Estimated Fair Value	31,169	18,476
Losses more than 12 Months, Gross Unrealized Losses	248	139
Obligations of States and Municipal Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	82,175	841
Losses less than 12 Months, Gross Unrealized Losses	$ 1,944	$ 4

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, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 46,696	$ 47,018
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	39,014	33,339
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	474	780
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 7,208	$ 12,899

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, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 47.6	$ 47	$ 45.3
Loans Held for Sale
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 0.1	$ 0.1

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, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 12,365,334	$ 12,719,129	$ 13,392,191
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	6,928,047	7,251,051	7,749,310
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	4,189,775	4,421,286
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,287,406	1,310,612
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	924,314	971,662
Commercial and Industrial | Healthcare
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	526,552	547,491
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	2,973,170	2,913,108	2,980,760
Commercial Real Estate | Industrial, Retail, and Other
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,723,545	1,683,975
Commercial Real Estate | Multifamily
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	804,495	776,494
Commercial Real Estate | Office
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	445,130	452,639
Consumer
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	2,464,117	2,554,970	$ 2,662,121
Consumer | Residential
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	2,375,017	2,452,865
Consumer | ConsumerOtherMember
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 89,100	$ 102,105

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, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 47.6	$ 47	$ 45.3
Loans And Leases Receivable Gross Carrying Amount
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 47.6	$ 47

Loans Held for Sale, Loans an_7

Loans Held for Sale, Loans and Allowance for Credit Losses - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021USD ($)TDR	Mar. 31, 2020USD ($)TDR	Dec. 31, 2020USD ($)
Accounts Notes And Loans Receivable [Line Items]
Allowance for Credit Losses	$ 48,300,000
Collateral loans impaired	$ 93,100,000
Number of TDRs | TDR	0	0
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Foreclosed residential properties	$ 49,000		$ 49,000
Residential Real Estate | Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Residential mortgage loans in process of foreclosure	1,600,000		$ 1,600,000
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Charge-offs related loans modified into TDRs		$ 6,800,000
Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Charge-offs related loans modified into TDRs	289,000
Paycheck Protection Program
Accounts Notes And Loans Receivable [Line Items]
Credit Facility, maximum borrowing capacity	$ 2,000,000
Debt instrument, interest rate description	The loans have a 1% fixed interest rate. Loans issued prior to June 5, 2020 are due in two years unless otherwise modified and loans issued after June 5, 2020 are due in five years

Loans Held for Sale, Loans an_8

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of PPP Loans by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
As a % of total loans	6.50%	7.40%
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Amortized Cost	$ 807,345	$ 938,260
% of PPP Portfolio	100.00%	100.00%
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Amortized Cost	$ 555,274	$ 648,458
% of PPP Portfolio	68.80%	69.10%
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Amortized Cost	$ 67,512	$ 76,228
% of PPP Portfolio	8.40%	8.10%
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Amortized Cost	$ 119,662	$ 134,454
% of PPP Portfolio	14.80%	14.40%
Commercial and Industrial | Healthcare
Accounts Notes And Loans Receivable [Line Items]
Amortized Cost	$ 64,897	$ 79,120
% of PPP Portfolio	8.00%	8.40%

Loans Held for Sale, Loans an_9

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, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	$ 367,160
Provision (release) for credit losses	(47,015)	$ 82,238
Charge-offs	(14,671)	(33,098)
Recoveries	2,563	613
Balance at end of period	308,037	245,246
Allowance for credit losses, collectively evaluated for impairment	282,208	226,147
Allowance for credit losses, individually evaluated for impairment	25,829	19,099
Loans collectively evaluated	12,272,237	13,244,573
Loans individually evaluated	93,097	147,618
Loans ending balance	12,365,334	13,392,191	$ 12,719,129
Before Adoption
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		119,643
Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 75,850
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 195,493
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	141,187
Provision (release) for credit losses	(29,481)	17,798
Charge-offs	(401)	(478)
Recoveries	105	180
Balance at end of period	111,410	53,418
Allowance for credit losses, collectively evaluated for impairment	111,410	53,418
Loans collectively evaluated	2,960,299	2,975,416
Loans individually evaluated	12,871	5,344
Loans ending balance	2,973,170	2,980,760	2,913,108
Commercial Real Estate | Before Adoption
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		15,319
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 20,599
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 35,918
Consumer
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	38,608
Provision (release) for credit losses	(7,940)	756
Charge-offs	(146)	(633)
Recoveries	734	292
Balance at end of period	31,256	37,243
Allowance for credit losses, collectively evaluated for impairment	31,256	37,243
Loans collectively evaluated	2,462,334	2,659,630
Loans individually evaluated	1,783	2,491
Loans ending balance	2,464,117	2,662,121	2,554,970
Consumer | Before Adoption
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		14,528
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 22,300
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 36,828
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	187,365
Provision (release) for credit losses	(9,594)	63,684
Charge-offs	(14,124)	(31,987)
Recoveries	1,724	141
Balance at end of period	165,371	154,585
Allowance for credit losses, collectively evaluated for impairment	139,542	135,486
Allowance for credit losses, individually evaluated for impairment	25,829	19,099
Loans collectively evaluated	6,849,604	7,609,527
Loans individually evaluated	78,443	139,783
Loans ending balance	6,928,047	7,749,310	$ 7,251,051
Commercial and Industrial | Before Adoption
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		89,796
Commercial and Industrial | Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 32,951
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Commercial and Industrial | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 122,747
Reserve for Unfunded Commitments
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	2,296
Provision (release) for credit losses	(1,247)	1,191
Balance at end of period	1,049	3,222
Reserve for Unfunded Commitments | Before Adoption
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		1,699
Reserve for Unfunded Commitments | Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 332
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Reserve for Unfunded Commitments | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 2,031
After Reserve For Unfunded Commitments
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	369,456
Provision (release) for credit losses	(48,262)	83,429
Charge-offs	(14,671)	(33,098)
Recoveries	2,563	613
Balance at end of period	$ 309,086	248,468
After Reserve For Unfunded Commitments | Before Adoption
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		121,342
After Reserve For Unfunded Commitments | Cumulative Effect, Period of Adoption, Adjustment
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 76,182
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
After Reserve For Unfunded Commitments | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period		$ 197,524

Loans Held for Sale, Loans a_10

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Receivables [Abstract]
Accrued interest receivable	$ 47.6	$ 47	$ 45.3

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 (Details) $ in Thousands	Mar. 31, 2021USD ($)
Financing Receivable Recorded Investment [Line Items]
2021	$ 432,313
2020	2,490,632
2019	1,537,419
2018	2,000,076
2017	1,283,713
2016 and Prior	2,072,398
Revolving Loans	2,493,207
Revolving Credits Converted to Term Loans	55,576
Total	12,365,334
Commercial Portfolio Segment
Financing Receivable Recorded Investment [Line Items]
2021	285,935
2020	1,524,314
2019	583,128
2018	868,807
2017	577,381
2016 and Prior	881,387
Revolving Loans	2,151,519
Revolving Credits Converted to Term Loans	55,576
Total	6,928,047
Commercial Portfolio Segment | Pass
Financing Receivable Recorded Investment [Line Items]
2021	285,913
2020	1,472,441
2019	539,095
2018	752,344
2017	537,347
2016 and Prior	786,593
Revolving Loans	1,909,311
Revolving Credits Converted to Term Loans	45,200
Total	6,328,244
Commercial Portfolio Segment | Special mention
Financing Receivable Recorded Investment [Line Items]
2020	272
2019	24,948
2018	11,555
2017	202
2016 and Prior	8,783
Revolving Loans	120,640
Revolving Credits Converted to Term Loans	23
Total	166,423
Commercial Portfolio Segment | Substandard
Financing Receivable Recorded Investment [Line Items]
2021	22
2020	51,601
2019	19,085
2018	97,720
2017	39,644
2016 and Prior	80,720
Revolving Loans	108,406
Revolving Credits Converted to Term Loans	10,353
Total	407,551
Commercial Portfolio Segment | Doubtful
Financing Receivable Recorded Investment [Line Items]
2018	7,188
2017	188
2016 and Prior	5,291
Revolving Loans	13,162
Total	25,829
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
2021	47,417
2020	505,492
2019	566,576
2018	676,366
2017	474,686
2016 and Prior	589,115
Revolving Loans	113,518
Total	2,973,170
Commercial Real Estate | Pass
Financing Receivable Recorded Investment [Line Items]
2021	47,324
2020	504,746
2019	551,851
2018	634,135
2017	405,782
2016 and Prior	514,103
Revolving Loans	113,040
Total	2,770,981
Commercial Real Estate | Special mention
Financing Receivable Recorded Investment [Line Items]
2020	746
2019	42
2018	23,060
2017	30,382
2016 and Prior	7,668
Revolving Loans	194
Total	62,092
Commercial Real Estate | Substandard
Financing Receivable Recorded Investment [Line Items]
2021	93
2019	14,683
2018	19,171
2017	38,522
2016 and Prior	67,344
Revolving Loans	284
Total	140,097
Consumer
Financing Receivable Recorded Investment [Line Items]
2021	98,961
2020	460,826
2019	387,715
2018	454,903
2017	231,646
2016 and Prior	601,896
Revolving Loans	228,170
Total	2,464,117
Consumer | Current
Financing Receivable Recorded Investment [Line Items]
2021	98,961
2020	460,461
2019	384,968
2018	447,624
2017	231,131
2016 and Prior	586,505
Revolving Loans	227,281
Total	2,436,931
Consumer | 30-59 days past due
Financing Receivable Recorded Investment [Line Items]
2020	365
2019	1,161
2018	2,391
2017	133
2016 and Prior	9,171
Revolving Loans	713
Total	13,934
Consumer | 60-89 days past due
Financing Receivable Recorded Investment [Line Items]
2019	353
2018	2,268
2017	88
2016 and Prior	2,313
Revolving Loans	176
Total	5,198
Consumer | 90+ days past due
Financing Receivable Recorded Investment [Line Items]
2019	1,233
2018	2,620
2017	294
2016 and Prior	3,907
Total	$ 8,054

Loans Held for Sale, Loans a_12

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, 2021	Dec. 31, 2020	Mar. 31, 2020
Receivables [Abstract]
Accrued interest receivable	$ 47.6	$ 47	$ 45.3

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 (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	$ 98,905	$ 107,243
Current	12,266,429	12,611,886
Total	12,365,334	12,719,129
90+ Days Past Due and Accruing	1,399	13,880
30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	36,788	42,368
60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	28,521	18,966
90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	33,596	45,909
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	35,055	48,004
Current	6,892,992	7,203,047
Total	6,928,047	7,251,051
90+ Days Past Due and Accruing	25	9,130
Commercial and Industrial | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	8,109	12,191
Commercial and Industrial | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	10,630	12,184
Commercial and Industrial | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	16,316	23,629
Commercial and Industrial | General C&I
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	15,928	32,563
Current	4,173,847	4,388,723
Total	4,189,775	4,421,286
90+ Days Past Due and Accruing	25	9,130
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	6,295	4,609
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	1,090	11,653
Commercial and Industrial | General C&I | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	8,543	16,301
Commercial and Industrial | Energy Sector
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,642	1,691
Current	1,285,764	1,308,921
Total	1,287,406	1,310,612
Commercial and Industrial | Energy Sector | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,642	1,691
Commercial and Industrial | Restaurant Industry
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	15,663	13,146
Current	908,651	958,516
Total	924,314	971,662
Commercial and Industrial | Restaurant Industry | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	642	7,561
Commercial and Industrial | Restaurant Industry | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	9,359	302
Commercial and Industrial | Restaurant Industry | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	5,662	5,283
Commercial and Industrial | Healthcare
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,822	604
Current	524,730	546,887
Total	526,552	547,491
Commercial and Industrial | Healthcare | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,172	21
Commercial and Industrial | Healthcare | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	181	229
Commercial and Industrial | Healthcare | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	469	354
Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	36,664	26,014
Current	2,936,506	2,887,094
Total	2,973,170	2,913,108
90+ Days Past Due and Accruing		125
Commercial Real Estate | Industrial, retail, and other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	26,595	18,150
Current	1,696,950	1,665,825
Total	1,723,545	1,683,975
90+ Days Past Due and Accruing		125
Commercial Real Estate | Multifamily
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans		198
Current	804,495	776,296
Total	804,495	776,494
Commercial Real Estate | Office
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	10,069	7,666
Current	435,061	444,973
Total	445,130	452,639
Commercial Real Estate | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	14,745	13,027
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	13,345	12,619
Commercial Real Estate | 30-59 days past due | Office
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,400	408
Commercial Real Estate | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	12,693	3,082
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	11,226	2,884
Commercial Real Estate | 60-89 days past due | Multifamily
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans		198
Commercial Real Estate | 60-89 days past due | Office
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	1,467
Commercial Real Estate | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	9,226	9,905
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	2,024	2,647
Commercial Real Estate | 90+ days past due | Office
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	7,202	7,258
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	27,186	33,225
Current	2,436,931	2,521,745
Total	2,464,117	2,554,970
90+ Days Past Due and Accruing	1,374	4,625
Consumer | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	26,554	33,041
Current	2,348,463	2,419,824
Total	2,375,017	2,452,865
90+ Days Past Due and Accruing	1,341	4,625
Consumer | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	632	184
Current	88,468	101,921
Total	89,100	102,105
90+ Days Past Due and Accruing	33
Consumer | 30-59 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	13,934	17,150
Consumer | 30-59 days past due | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	13,439	16,971
Consumer | 30-59 days past due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	495	179
Consumer | 60-89 days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	5,198	3,700
Consumer | 60-89 days past due | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	5,094	3,695
Consumer | 60-89 days past due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	104	5
Consumer | 90+ days past due
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	8,054	12,375
Consumer | 90+ days past due | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	8,021	$ 12,375
Consumer | 90+ days past due | Other
Financing Receivable Recorded Investment Past Due [Line Items]
Age Analysis of Past-Due Loans	$ 33

Loans Held for Sale, Loans a_14

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, 2021	Dec. 31, 2020	Mar. 31, 2020
Receivables [Abstract]
Accrued interest receivable	$ 47.6	$ 47	$ 45.3

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 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	$ 123,363	$ 138,002
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	27,529
90+ Days Past Due and Accruing	1,399	13,880
Interest Income Recognized	798
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	94,153	109,411
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	14,222
90+ Days Past Due and Accruing	25	9,130
Interest Income Recognized	525
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	21,222	34,363
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	3,150
90+ Days Past Due and Accruing	25	9,130
Interest Income Recognized	26
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	34,212	20,241
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	1,642
Interest Income Recognized	1
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	37,873	53,856
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	9,430
Interest Income Recognized	1
Commercial and Industrial | Healthcare
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	846	951
Interest Income Recognized	497
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	14,846	14,559
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	12,211
90+ Days Past Due and Accruing		125
Interest Income Recognized	157
Commercial Real Estate | Industrial, Retail, and Other
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	6,177	7,301
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	3,624
Interest Income Recognized	86
Commercial Real Estate | Office
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	8,669	7,258
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	8,587
Interest Income Recognized	71
Consumer
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	14,364	14,032
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	1,096
90+ Days Past Due and Accruing	1,374	4,625
Interest Income Recognized	116
Consumer | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	14,361	14,028
Nonaccrual Loans - Amortized Cost, No Allowance Recorded	1,096
90+ Days Past Due and Accruing	1,341	4,625
Interest Income Recognized	114
Consumer | Other Consumer
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual Loans - Amortized Cost, December 31, 2020	3	$ 4
90+ Days Past Due and Accruing	33
Interest Income Recognized	$ 2

Loans Held for Sale, Loans a_16

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, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 46,696	$ 47,018
Accrued interest receivable	47,600	47,000	$ 45,300
Nonperforming loans
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	3,400	$ 200
Non Accruing Loans | Maximum
Accounts Notes And Loans Receivable [Line Items]
Accrued interest receivable	$ 100

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 (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)TDR	Mar. 31, 2020USD ($)TDR
Financing Receivable Modifications [Line Items]
Number of TDRs | TDR	1	7
Amortized Cost | $	$ 2,362	$ 65,691
Commercial and Industrial | General C&I
Financing Receivable Modifications [Line Items]
Number of TDRs | TDR		4
Amortized Cost | $		$ 33,339
Commercial and Industrial | Energy Sector
Financing Receivable Modifications [Line Items]
Number of TDRs | TDR		1
Amortized Cost | $		$ 8,105
Commercial and Industrial | Restaurant Industry
Financing Receivable Modifications [Line Items]
Number of TDRs | TDR		2
Amortized Cost | $		$ 24,247
Industrial, Retail, and Other
Financing Receivable Modifications [Line Items]
Number of TDRs | TDR	1
Amortized Cost | $	$ 2,362

Loans Held for Sale, Loans a_18

Loans Held for Sale, Loans and Allowance for Credit Losses - Summary of Loan that were Modified Into TDRs (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable Modifications [Line Items]
Net accrued interest receivable	$ 0
Maximum
Financing Receivable Modifications [Line Items]
Net accrued interest receivable		$ 0.1

Loans Held for Sale, Loans a_19

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, 2021	Mar. 31, 2020
Financing Receivable Modifications [Line Items]
Number of Loans Modified	1	7
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	1	6
Commercial and Industrial | General C&I
Financing Receivable Modifications [Line Items]
Number of Loans Modified		4
Commercial and Industrial | General C&I | Modified Terms and/or Other Concessions
Financing Receivable Modifications [Line Items]
Number of Loans Modified		4
Commercial and Industrial | Energy Sector
Financing Receivable Modifications [Line Items]
Number of Loans Modified		1
Commercial and Industrial | Energy Sector | Rate Concession
Financing Receivable Modifications [Line Items]
Number of Loans Modified		1
Commercial and Industrial | Restaurant Industry
Financing Receivable Modifications [Line Items]
Number of Loans Modified		2
Commercial and Industrial | Restaurant Industry | Modified Terms and/or Other Concessions
Financing Receivable Modifications [Line Items]
Number of Loans Modified		2
Industrial, Retail, and Other
Financing Receivable Modifications [Line Items]
Number of Loans Modified	1
Industrial, Retail, and Other | Modified Terms and/or Other Concessions
Financing Receivable Modifications [Line Items]
Number of Loans Modified	1

Derivatives - Schedule of Notio

Derivatives - Schedule of Notional Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Derivatives Fair Value [Line Items]
Notional Amount	$ 2,438,777	$ 2,478,225
Fair Value, Other Assets	36,809	56,977
Fair Value, Other Liabilities	13,146	15,000
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	350,000
Fair Value, Other Assets	11,744	22,560
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	11,744	22,560
Derivatives Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Notional Amount	2,088,777	2,128,225
Fair Value, Other Assets	25,065	34,417
Fair Value, Other Liabilities	13,146	15,000
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Interest Rate Lock Commitments
Derivatives Fair Value [Line Items]
Notional Amount	26,126	33,458
Fair Value, Other Assets	249	531
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Floating Commitments
Derivatives Fair Value [Line Items]
Notional Amount	4,746	4,206
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Notional Amount	67,500	89,707
Fair Value, Other Assets	986	780
Fair Value, Other Liabilities	829	1,058
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional Amount	1,188,783	1,200,581
Fair Value, Other Assets	13,916	20,699
Fair Value, Other Liabilities	2,503	1,647
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Caps
Derivatives Fair Value [Line Items]
Notional Amount	177,747	162,479
Fair Value, Other Assets	10	4
Fair Value, Other Liabilities	10	4
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Floors
Derivatives Fair Value [Line Items]
Notional Amount	551,412	560,048
Fair Value, Other Assets	9,654	11,986
Fair Value, Other Liabilities	9,654	11,986
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Collars
Derivatives Fair Value [Line Items]
Notional Amount	64,442	66,665
Fair Value, Other Assets	150	305
Fair Value, Other Liabilities	150	305
Derivatives Not Designated as Hedging Instruments | Forward Contracts | Mortgage Loan Forward Sale Commitments
Derivatives Fair Value [Line Items]
Notional Amount	8,021	11,081
Fair Value, Other Assets	$ 100	$ 112

Derivatives - Additional Inform

Derivatives - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Derivative [Line Items]
Obligation to return cash collateral provided by counterparty		$ 10,600
Pre-tax gains (losses) for derivatives recorded in noninterest income		(27,400)
Derivative, notional amount		2,438,777	$ 2,478,225
Cash Flow Hedges
Derivative [Line Items]
Derivative, notional amount	$ 4,000,000			$ 4,000,000
Realized gain on termination of cash flow hedges collar	$ 261,200
Amortization period of gain reflected in other comprehensive income net of deferred income taxes	amortize into interest income through February 29, 2024
Hedge ineffectiveness gain reclassified from OCI		$ 0	169,200	0
Maximum period for hedging transactions		4 years 10 months 24 days
Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Derivative, notional amount		$ 2,088,777	2,128,225
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Interest Rate Lock Commitments
Derivative [Line Items]
Pre-tax gains (losses) for derivatives recorded in noninterest income		(282)		311
Derivative, notional amount		26,126	33,458
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivative [Line Items]
Pre-tax gains (losses) for derivatives recorded in noninterest income		1,100		$ 865
Derivative, notional amount		67,500	89,707
Interest-bearing Deposits in Banks
Derivative [Line Items]
Cash or securities pledged as collateral		$ 9,300	$ 11,400

Derivatives - Schedule of Gain

Derivatives - Schedule of Gain (Loss) in Consolidated Statements of Income Related to Derivative Instruments (Details) - Derivatives Designated as Hedging Instruments - Cash Flow Hedges - Commercial Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest Rate Swaps
Derivative Instruments Gain Loss [Line Items]
OCI	$ (9,532)	$ 24,035
Reclassified from AOCI to interest income	1,284	(106)
Interest Rate Collars
Derivative Instruments Gain Loss [Line Items]
OCI		143,198
Reclassified from AOCI to interest income	$ 12,812	$ 8,213

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Domestic
Time Deposits [Line Items]
Time deposits $250,000 and over	$ 480.2	$ 486.3

Borrowed Funds - Summary of Deb

Borrowed Funds - Summary of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt issue costs and unamortized premium	$ (1,430)	$ (1,670)
Total senior and subordinated debt	193,570	233,330
Cadence Bancorporation
Debt Instrument [Line Items]
Long-term debt, gross	170,000	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 | 3-month LIBOR Plus 4.884% Subordinated Notes, Due March 11, 2025, Callable in 2020
Debt Instrument [Line Items]
Long-term debt, gross		40,000
Cadence Bancorporation | 4.750% Subordinated Notes, Due June 30, 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, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 30, 2021
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
3-month LIBOR Plus 4.884% Subordinated Notes, Due March 11, 2025, Callable in 2020
Debt Instrument [Line Items]
Debt instrument, interest rate	4.884%	4.884%
Debt instrument, maturity date	Mar. 11, 2025	Mar. 11, 2025
4.750% Subordinated Notes, Due June 30, 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 - Additional Inf

Borrowed Funds - Additional Information (Details) - USD ($)	Feb. 05, 2021	Mar. 31, 2021	Dec. 31, 2020
Borrowed Funds [Line Items]
Amount of subordinated notes intend to call	$ 40,000,000
Subordinated notes due date	Mar. 11, 2025
FHLB advances		$ 100,000,000	$ 100,000,000
FHLB borrowing availability		889,900,000
Municipal Deposits
Borrowed Funds [Line Items]
Irrevocable letter of credit		749,000,000	$ 1,300,000,000
Letter of Credit | Municipal Deposits
Borrowed Funds [Line Items]
Borrowings		749,000,000
Expiration on April 15, 2021 | Municipal Deposits
Borrowed Funds [Line Items]
Borrowings		$ 291,000,000
Letter of credit expiration date		Apr. 15, 2021
Expiration on June 30, 2021 | Municipal Deposits
Borrowed Funds [Line Items]
Borrowings		$ 377,000,000
Letter of credit expiration date		Jun. 30, 2021
Expiration on December 31, 2021 | Municipal Deposits
Borrowed Funds [Line Items]
Borrowings		$ 81,000,000
Letter of credit expiration date		Dec. 31, 2021
Commercial and Residential Real Estate Loan
Borrowed Funds [Line Items]
FHLB advances collateral amount		$ 3,700,000,000

Borrowed Funds - Summary of Jun

Borrowed Funds - Summary of Junior Subordinated Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Junior subordinated debentures, gross	$ 50,619	$ 50,619
Purchase accounting adjustment, net of amortization	(12,925)	(12,982)
Total junior subordinated debentures	37,694	37,637
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, 2021	Dec. 31, 2020
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, 2021	Mar. 31, 2020
Other noninterest income
Insurance revenue	$ 270	$ 249
Income from bank owned life insurance policies	1,574	1,328
Other	4,688	(577)
Total other noninterest income	6,532	1,000
Other noninterest expenses
Data processing expense	3,259	3,352
Software amortization	4,507	3,547
Consulting and professional fees	3,233	2,707
Loan related expenses	796	760
FDIC insurance	1,465	2,436
Communications	1,243	1,156
Advertising and public relations	927	1,464
Legal expenses	925	411
Other	9,037	11,636
Total other noninterest expenses	$ 25,392	$ 27,469

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 30,459	$ (33,234)
Effective tax rate	22.30%	7.70%
Net deferred tax asset	$ 72,100		$ 63,700

Earnings Per Common Share - Rec

Earnings Per Common Share - Reconciliation of Basic and Diluted Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income (loss) per consolidated statements of operations	$ 106,425	$ (399,311)
Net income allocated to participating securities	(596)
Net income (loss) allocated to common stock	$ 105,829	$ (399,311)
Weighted average common shares outstanding (Basic)	125,079,250	126,630,446
Weighted average dilutive restricted stock units and warrants	542,258
Weighted average common shares outstanding (Diluted)	125,621,508	126,630,446
Earnings (loss) per common share (Basic)	$ 0.85	$ (3.15)
Earnings (loss) per common share (Diluted)	$ 0.84	$ (3.15)

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock Options and Restricted Stock Units
Earnings Per Share [Line Items]
Antidilutive stock options and restricted stock units	$ 171,483	$ 2,512,524

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Banking And Thrifts [Abstract]
Describes the potential impact of COVID-19	During 2020, the federal banking agencies issued a 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 the strains on the U.S economy due to COVID-19, while also maintaining the quality of regulatory capital. Under the final rule, 100% of the CECL Day 1 impact and 25% of subsequent provisions for credit losses (“Day 2” impacts) are deferred over a two-year year period ending January 1, 2022, at which time this deferred amount will be phased in on a pro rata basis over a three-year period ending January 2025.
Cash on hand	$ 183.5
Senior debt	$ 50
Debt instrument, maturity date	Jun. 30, 2021

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Actual Capital Ratios for Company and Bank (Details)	Mar. 31, 2021	Dec. 31, 2020
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 leverage	0.109	0.109
Common equity tier 1 capital	0.142	0.140
Tier 1 risk-based capital	0.142	0.140
Total risk-based capital	0.167	0.167
Cadence Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 leverage	0.110	0.113
Common equity tier 1 capital	0.140	0.141
Tier 1 risk-based capital	0.143	0.145
Total risk-based capital	0.158	0.159

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Summary of Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Commitments to Grant Loans
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Commitments to grant loans	$ 285,863	$ 154,507
Standby Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Letters of credit	216,011	216,741
Performance Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Performance letters of credit	17,032	16,065
Commercial Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Letters of credit	20,832	21,156
Commitments to Extend Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Commitments to extend credit	$ 4,450,271	$ 4,344,268

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Unfunded commitments - LLC Investments	$ 39.3	$ 40.6

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, 2021	Dec. 31, 2020
Assets
Investment securities available-for-sale	$ 3,918,666	$ 3,332,168
Derivative assets	36,809	56,977
Liabilities
Derivative liabilities	13,146	15,000
Carrying Value
Assets
Investment securities available-for-sale	3,918,666	3,332,168
Derivative assets	36,809	56,977
Liabilities
Derivative liabilities	13,146	15,000
Level 2
Assets
Investment securities available-for-sale	3,918,666	3,332,168
Derivative assets	36,809	56,977
Liabilities
Derivative liabilities	13,146	15,000
Fair Value, Measurements, Recurring | Carrying Value
Assets
Investment securities available-for-sale	3,918,666	3,332,168
Derivative assets	36,809	56,977
Other assets	40,693	38,758
Total assets	3,996,168	3,427,903
Liabilities
Derivative liabilities	13,146	15,000
Total recurring basis measured liabilities	13,146	15,000
Fair Value, Measurements, Recurring | Level 2
Assets
Investment securities available-for-sale	3,918,666	3,332,168
Derivative assets	36,809	56,977
Total assets	3,955,475	3,389,145
Liabilities
Derivative liabilities	13,146	15,000
Total recurring basis measured liabilities	13,146	15,000
Fair Value, Measurements, Recurring | Level 3
Assets
Other assets	40,693	38,758
Total assets	$ 40,693	$ 38,758

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, 2021	Mar. 31, 2020
Net Profits Interests
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 3,282	$ 4,330
Net (losses) gains included in earnings		(259)
Ending Balance	3,282	4,071
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period		(259)
Investments in Limited Partnerships
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	30,902	18,742
Net (losses) gains included in earnings	1,785	(316)
Reclassifications	(2)	525
Contributions paid	1,807	1,283
Distributions received	(2,012)	(449)
Ending Balance	32,480	19,785
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	1,785	(316)
SBA Servicing Assets
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	4,574	3,811
Originations	387	299
Net (losses) gains included in earnings	(30)	(168)
Ending Balance	4,931	3,942
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period	$ (30)	$ (168)

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, 2021	Dec. 31, 2020	Mar. 31, 2020
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Individually evaluated loans, net of allocated allowance for credit losses	$ 93,097		$ 147,618
Level 2
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale	69,858	$ 47,018
Fair Value, Nonrecurring
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale	46,696	47,018
Individually evaluated loans, net of allocated allowance for credit losses	67,268	87,084
Other real estate and repossessed assets	6,255
Other real estate		6,517
Total assets	120,219	140,619
Fair Value, Nonrecurring | Level 2
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale	46,696	47,018
Total assets	46,696	47,018
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	67,268	87,084
Other real estate and repossessed assets	6,255
Other real estate		6,517
Total assets	$ 73,523	$ 93,601

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, 2021USD ($)	Dec. 31, 2020USD ($)
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		Discount to fair value	Discount to fair value
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		104.00%	72.00%
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		0.00%	0.00%
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]
Range/Weighted Average	[1]		32.00%
Fair value inputs, discount rate	[1]	0.26
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		$ 67,268	$ 87,084
Discount of Fair Value | Other Real Estate and Repossessed Assets
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 Real Estate and Repossessed Assets | 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 Real Estate and Repossessed Assets | 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 Real Estate and Repossessed Assets | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average	[1]	10.00%	10.00%
Discount of Fair Value | Other Real Estate and Repossessed Assets | Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying Value		$ 6,255	$ 6,517
Discounted Cash Flow
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unobservable Inputs			Discount rate
Discounted Cash Flow | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average			3.91%
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 | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range/Weighted Average	[1]		4.00%
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	Comparables and average multiplier
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	[1]	6.23%
Range/Weighted Average	[1]		4.95%
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	Discount rates and comparables
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		13.00%	15.00%
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		9.00%	9.00%
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	[1]	11.00%
Range/Weighted Average	[1]		12.00%
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]
Fair value measurements, percentage of enterprise value	[1]	10.00%
[1]	Weighted averages was 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, 2021	Dec. 31, 2020
Financial Assets:
Interest-bearing deposits with banks	$ 1,680,087	$ 1,768,847
Federal funds sold	3,006	1,838
Investment securities available-for-sale	3,918,666	3,332,168
Derivative assets	36,809	56,977
Other assets	313,890	349,118
Financial Liabilities:
Advances from FHLB	100,000	100,000
Senior debt	49,994	49,986
Subordinated debt	143,575	183,344
Junior subordinated debentures	37,694	37,637
Notes payable	1,721	1,702
Derivative liabilities	13,146	15,000
Level 1
Financial Assets:
Cash and due from banks	205,425	283,261
Interest-bearing deposits with banks	1,680,087	1,768,847
Federal funds sold	3,006	1,838
Level 2
Financial Assets:
Investment securities available-for-sale	3,918,666	3,332,168
Loans held for sale	69,858	47,018
Derivative assets	36,809	56,977
Financial Liabilities:
Deposits	16,134,499	16,059,358
Advances from FHLB	100,000	100,000
Senior debt	50,264	50,439
Subordinated debt	154,412	191,438
Junior subordinated debentures	44,219	42,745
Notes payable	1,721	1,702
Derivative liabilities	13,146	15,000
Level 3
Financial Assets:
Net loans	12,165,321	12,529,458
Other assets	94,579	96,838
Carrying Value
Financial Assets:
Cash and due from banks	205,425	283,261
Interest-bearing deposits with banks	1,680,087	1,768,847
Federal funds sold	3,006	1,838
Investment securities available-for-sale	3,918,666	3,332,168
Loans held for sale	69,858	47,018
Net loans	12,057,297	12,351,969
Derivative assets	36,809	56,977
Other assets	94,579	96,838
Financial Liabilities:
Deposits	16,129,199	16,052,245
Advances from FHLB	100,000	100,000
Senior debt	49,994	49,986
Subordinated debt	143,575	183,344
Junior subordinated debentures	37,694	37,637
Notes payable	1,721	1,702
Derivative liabilities	13,146	15,000
Fair Value
Financial Assets:
Cash and due from banks	205,425	283,261
Interest-bearing deposits with banks	1,680,087	1,768,847
Federal funds sold	3,006	1,838
Investment securities available-for-sale	3,918,666	3,332,168
Loans held for sale	69,858	47,018
Net loans	12,165,321	12,529,458
Derivative assets	36,809	56,977
Other assets	94,579	96,838
Financial Liabilities:
Deposits	16,134,499	16,059,358
Advances from FHLB	100,000	100,000
Senior debt	50,264	50,439
Subordinated debt	154,412	191,438
Junior subordinated debentures	44,219	42,745
Notes payable	1,721	1,702
Derivative liabilities	$ 13,146	$ 15,000

Variable Interest Entities an_3

Variable Interest Entities and Other Investments - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)Investment	Dec. 31, 2018Customer	Dec. 31, 2019USD ($)	Dec. 31, 2016Customer
Variable Interest Entities and Other Investments [Line Items]
Cost method investments	$ 4,559,000	$ 8,241,000	$ 7,105,000		$ 8,681,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities and Other Investments [Line Items]
Investment accounted under fair value practical expedient of net asset value	32,500,000		30,900,000
Loss recognized from assets at fair value		300,000
Gain recognized from assets at fair value	1,800,000
Cost method investments	4,600,000		$ 7,100,000
Number of investments fully impaired | Investment			1
Impairment charge			$ 1,900,000
Number of loan customers | Customer						2
Number of loan customers sold | Customer				1
Net profits interest		$ 3,300,000	3,300,000
Variable Interest Entity, Not Primary Beneficiary | Rabbi Trust
Variable Interest Entities and Other Investments [Line Items]
Defined rabbi trust assets and benefit obligation	4,100,000		4,000,000
Variable Interest Entity, Not Primary Beneficiary | Limited Partner
Variable Interest Entities and Other Investments [Line Items]
Equity method investments	14,100,000		14,600,000
Variable Interest Entity, Not Primary Beneficiary | Other Assets
Variable Interest Entities and Other Investments [Line Items]
Investments in affordable Housing Project	$ 30,700,000		$ 31,500,000

Variable Interest Entities an_4

Variable Interest Entities and Other Investments - Summary of Investment in Limited Partnerships (Details) - Investments in Limited Partnerships - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entities and Other Investments [Line Items]
Affordable housing projects (amortized cost)	$ 30,665	$ 31,541
Limited partnerships accounted for under the fair value practical expedient of NAV	32,480	30,902
Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method	4,559	7,105
Limited partnerships required to be accounted for under the equity method	14,136	14,646
Total investments in limited partnerships	$ 81,840	$ 84,194

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, 2021	Mar. 31, 2020
Variable Interest Entities And Other Investments [Abstract]
Carrying value, Beginning of Year	$ 7,105	$ 8,681
Reclassifications	2,821	(525)
Distributions	(5,941)	(215)
Contributions	574	300
Carrying value, End of Period	$ 4,559	$ 8,241

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charge		$ 443,695
Banking
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charge	$ 443,700

Segment Reporting - Summary of

Segment Reporting - Summary of Operating Results of Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 142,748	$ 153,468
Provision (release) for credit losses	(48,262)	83,429
Noninterest income	43,696	35,069
Noninterest expense	97,822	537,653
Income tax expense (benefit)	30,459	(33,234)
Net income (loss)	106,425	(399,311)
Total assets	18,800,350	17,237,918	$ 18,712,567
Banking
Segment Reporting Information [Line Items]
Net interest income (expense)	146,119	157,557
Provision (release) for credit losses	(48,262)	83,429
Noninterest income	30,071	25,343
Noninterest expense	86,867	528,066
Income tax expense (benefit)	32,153	(30,922)
Net income (loss)	105,432	(397,673)
Total assets	18,698,902	17,142,981
Financial Services
Segment Reporting Information [Line Items]
Net interest income (expense)	(47)	(352)
Noninterest income	13,261	10,208
Noninterest expense	9,329	8,710
Income tax expense (benefit)	386	95
Net income (loss)	3,499	1,051
Total assets	92,374	90,600
Corporate Segment
Segment Reporting Information [Line Items]
Net interest income (expense)	(3,324)	(3,737)
Noninterest income	364	(482)
Noninterest expense	1,626	877
Income tax expense (benefit)	(2,080)	(2,407)
Net income (loss)	(2,506)	(2,689)
Total assets	$ 9,074	$ 4,337

Equity-based Compensation - Add

Equity-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 01, 2018	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted		0	0
Equity-based compensation expense		$ 2,200	$ 1,100
Remaining expense related to unvested restricted stock units		$ 11,300
Stock options unvested		1,136,401	1,012,766		1,617,945	1,229,863
Restricted Stock Units | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense recognition period		3 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		10 months
Expense related to unvested stock option grants		$ 1,000
Stock Options | Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense		$ 309	$ 309
Number of options granted				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	534,283
Stock options unvested		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		3,800,000
Plan | Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted		0	0
Plan | Restricted Stock Units | Minimum [Member] | Half of Units Granted
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award shares to be issued, percentage		0.00%
Plan | Restricted Stock Units | Maximum | Half of Units Granted
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award shares to be issued, 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		$ 75	$ 14
Percentage of discount on fair market value of common stock	15.00%
Common stock purchased in the open market		20,212	67,844
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, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Non-vested at beginning of period	1,617,945	1,229,863
Number of shares, Granted during the period	0	0
Number of shares, Vested during the period	(363,495)	(160,668)
Number of shares, Forfeited during the period	(118,049)	(56,429)
Number of shares, Non-vested at end of period	1,136,401	1,012,766
Weighted average fair value per unit at award date, Non-vested at beginning of period	$ 14.35	$ 19.97
Weighted average fair value per unit at award date, Granted during the period	0	0
Weighted average fair value per unit at award date, Vested during the period	14.63	20.55
Weighted average fair value per unit at award date, Forfeited during the period	23.72	20.20
Weighted average fair value per unit at award date, Non-vested at end of period	$ 13.28	$ 19.86

Equity-based Compensation - S_2

Equity-based Compensation - Summary of Vesting Schedule (Details) - Restricted Stock Units - shares	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	1,136,401	1,617,945	1,012,766	1,229,863
Plan | Quarterly Vesting in June 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	1,000
Plan | Vesting in September 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	962
Plan | Vesting in March 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	24,282
Plan | Vesting in March 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	96,989
Plan | Vesting in June 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	5,252
Plan | Vesting in September 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	7,426
Plan | Vesting in March 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	544,361
Plan | Vesting in June 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	9,200
Plan | Vesting in September 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	10,000
Plan | Quarterly Vesting in March 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	138,652
Plan | Cliff Vesting in March 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unit expected to vest	21,653

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 2,121,102	$ 2,460,846
Net change	(86,887)	165,971
Balance	2,092,536	2,113,543
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	65,594	19,605
Net change	(68,810)	45,842
Balance	(3,216)	65,447
Unrealized Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	44,492	95,097
Net change	(18,077)	120,129
Balance	26,415	215,226
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	110,086	114,702
Net change	(86,887)	165,971
Balance	$ 23,199	$ 280,673

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - $ / shares	Apr. 22, 2021	Mar. 31, 2021	Mar. 31, 2020
Subsequent Event [Line Items]
Cash dividends declared per common share		$ 0.15	$ 0.175
Subsequent Event | Quarterly Dividend
Subsequent Event [Line Items]
Cash dividends declared per common share	$ 0.15
Subsequent Event | Annualized Dividend
Subsequent Event [Line Items]
Cash dividends declared per common share	$ 0.60