Cadence Bancorporation 10-Q 15 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 15, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	CADE
Entity Registrant Name	CADENCE BANCORPORATION
Entity Central Index Key	1,614,184
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		83,625,000

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 130,704	$ 238,707
Interest-bearing deposits with banks	281,297	482,568
Federal funds sold	4,695	9,536
Total cash and cash equivalents	416,696	730,811
Securities available-for-sale	1,246,005	1,257,063
Securities held-to-maturity (estimated fair value of $311 at December 31, 2017)		290
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Other securities - FRB and FHLB stock	50,662	50,009
Loans held for sale	37,446	61,359
Loans	8,646,987	8,253,427
Less: allowance for credit losses	(91,537)	(87,576)
Net loans	8,555,450	8,165,851
Interest receivable	47,813	47,793
Premises and equipment, net	62,092	63,432
Other real estate owned	6,642	7,605
Cash surrender value of life insurance	108,393	108,148
Net deferred tax asset	41,342	30,774
Goodwill	317,817	317,817
Other intangible assets, net	9,430	10,223
Other assets	93,765	91,866
Total Assets	10,999,382	10,948,926
Liabilities:
Noninterest-bearing deposits	2,040,977	2,242,765
Interest-bearing deposits	7,007,994	6,768,750
Total deposits	9,048,971	9,011,515
Securities sold under agreements to repurchase	1,298	1,026
Federal Home Loan Bank advances	150,000	150,000
Senior debt	184,700	184,629
Subordinated debt	98,746	98,687
Junior subordinated debentures	36,591	36,472
Other liabilities	121,973	107,541
Total liabilities	9,642,279	9,589,870
Shareholders' Equity:
Common Stock $0.01 par value, authorized 300,000,000 shares; 83,625,000 shares issued and outstanding at March 31, 2018 and December 31, 2017	836	836
Additional paid-in capital	1,037,493	1,037,040
Retained earnings	369,585	340,213
Accumulated other comprehensive loss ("OCI")	(50,811)	(19,033)
Total shareholders' equity	1,357,103	1,359,056
Total Liabilities and Shareholders' Equity	$ 10,999,382	$ 10,948,926

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Estimated fair value of held-to-maturity securities		$ 311
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	83,625,000	83,625,000
Common Stock, Shares, Outstanding	83,625,000	83,625,000

UNAUDITED CONDENSED CONSOLIDATE

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Interest and fees on loans	$ 102,791	$ 80,810
Interest and dividends on securities:
Taxable	5,118	4,301
Tax-exempt	3,266	3,414
Other interest income	1,918	1,094
Total interest income	113,093	89,619
INTEREST EXPENSE
Interest on time deposits	7,491	4,122
Interest on other deposits	9,139	5,643
Interest on borrowed funds	5,352	5,096
Total interest expense	21,982	14,861
Net interest income	91,111	74,758
Provision for credit losses	4,380	5,786
Net interest income after provision for credit losses	86,731	68,972
NONINTEREST INCOME
Service charges on deposit accounts	3,960	3,815
Other service fees	1,333	972
Credit related fees	3,577	2,747
Trust services revenue	5,015	5,231
Mortgage banking income	577	866
Investment advisory revenue	5,299	4,916
Securities gains, net	12	81
Other income	5,210	5,477
Total noninterest income	24,983	24,105
NONINTEREST EXPENSE
Salaries and employee benefits	37,353	34,267
Premises and equipment	7,591	6,693
Intangible asset amortization	792	1,241
Other expense	16,203	12,120
Total noninterest expense	61,939	54,321
Income before income taxes	49,775	38,756
Income tax expense	10,950	12,639
Net income	$ 38,825	$ 26,117
Weighted average common shares outstanding (Basic)	83,625,000	75,000,000
Weighted average common shares outstanding (Diluted)	84,674,807	75,672,750
Earnings per common share (Basic)	$ 0.46	$ 0.35
Earnings per common share (Diluted)	$ 0.46	$ 0.35

UNAUDITED CONDENSED CONSOLIDAT5

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 38,825	$ 26,117
Net unrealized (losses) gains on securities available-for-sale:
Unrealized (losses) gains arising during the period	(23,392)	1,112
Reclassification adjustments for gains realized in net income	(9)	(51)
Net unrealized (losses) gains on securities available-for-sale	(23,401)	1,061
Net unrealized losses on derivative instruments designated as cash flow hedges:
Unrealized losses arising during the period	(8,633)	(1,010)
Reclassification adjustments for losses (gains) realized in net income	256	(1,179)
Net change in unrealized losses on derivative instruments	(8,377)	(2,189)
Other comprehensive loss, net of tax	(31,778)	(1,128)
Comprehensive income	$ 7,047	$ 24,989

UNAUDITED CONDENSED CONSOLIDAT6

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Unrealized (losses) gains arising during the period, tax effect	$ 7,030	$ (644)
Reclassification adjustments for gains realized in net income, tax effect	3	30
Unrealized losses arising during the period, tax effect	2,645	580
Reclassification adjustments for losses (gains) realized in net income, tax effect	$ (77)	$ 688

UNAUDITED CONDENSED STATEMENTS

UNAUDITED CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated OCI
Balance at Dec. 31, 2017	$ 1,359,056	$ 836	$ 1,037,040	$ 340,213	$ (19,033)
Equity-based compensation cost	453		453
Net income	38,825			38,825
Cash dividends declared ($0.125 per common share)	(10,453)			(10,453)
Cumulative effect of adoption of new accounting principle	1,000			1,000
Other comprehensive loss	(31,778)				(31,778)
Balance at Mar. 31, 2018	$ 1,357,103	$ 836	$ 1,037,493	$ 369,585	$ (50,811)

UNAUDITED CONDENSED STATEMENTS8

UNAUDITED CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)	3 Months Ended
	Mar. 31, 2018$ / shares
Statement Of Stockholders Equity [Abstract]
Cash dividends declared, per common share	$ 0.125

UNAUDITED CONDENSED CONSOLIDAT9

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Cash Flows [Abstract]
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES	$ 72,788	$ 62,510
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of securities available-for-sale	(111,422)	(101,087)
Proceeds from sales of securities available-for-sale	64,536	84,696
Proceeds from maturities, calls and paydowns of securities available-for-sale	26,982	22,939
Proceeds from sale of commercial loans held for sale	3,500	9,925
Increase in loans, net	(397,496)	(171,010)
Purchase of premises and equipment	(2,347)	(937)
Proceeds from disposition of foreclosed property	2,529	1,295
Other, net	(460)	(16,542)
Net cash used in investing activities	(414,178)	(170,721)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in deposits, net	37,456	(175,029)
Net change in securities sold under agreements to repurchase	272	77
Advances from FHLB		360,000
Repayment of senior debt		(9,600)
Cash dividends paid on common stock	(10,453)
Net cash provided by financing activities	27,275	175,448
Net (decrease) increase in cash and cash equivalents	(314,115)	67,237
Cash and cash equivalents at beginning of period	730,811	248,925
Cash and cash equivalents at end of period	$ 416,696	$ 316,162

Summary of Accounting Policies

Summary of Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Accounting Policies	Note 1—Summary of Accounting Policies Basis of Presentation and Consolidation The accompanying unaudited condensed 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, 2017. Operating results for the period ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The Company and its subsidiaries follow accounting principles generally accepted in the United States of America, including, where applicable, general practices within the banking industry. The 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 (Note 20). Certain amounts reported in prior years have been reclassified to conform to the 2018 presentation. These reclassifications did not materially impact the Company’s consolidated balance sheets or consolidated statements of income. Nature of Operations The Company’s subsidiaries include: • Town & Country Insurance Agency, Inc., dba Cadence Insurance—full service insurance agency • The Bank The Bank operates under a national bank charter and is subject to regulation by the Office of the Comptroller of the Currency (OCC). The Bank provides lending services in Georgia and full banking services in five southern states: Alabama, Florida, Mississippi, Tennessee, and Texas. The Bank’s subsidiaries include: • Linscomb & Williams Inc. —financial advisory firm; and • Cadence Investment Services, Inc.—provides investment and insurance products, The Company and the Bank also have certain other non-operating and immaterial subsidiaries. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of and accounting for acquired credit impaired loans, valuation of goodwill, intangible assets and deferred income taxes. Recently Adopted Accounting Pronouncements In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous accounting guidance comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. Our major sources of revenue are from financial instruments that have been excluded from the scope of the new standard (including loans, derivatives, debt and equity securities, etc.). The standard required us to change how we recognize certain recurring revenue streams within insurance commissions and fees and other categories of noninterest income. The adoption at January 1, 2018 of ASU 2014-09 did not have a material effect on the Company’s financial statements. In January 2016, the FASB issued ASU 2016-01, “Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities”. ASU 2016-1, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheets, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheets or the accompanying notes to the financial statements and (viii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. The adoption at January 1, 2018 of ASU 2016-01 resulted in an adjustment to retained earnings of $1.0 million at January 1, 2018 related to fair value measurement changes to equity securities and certain limited partnership investments (See Notes 2, 16 and 20). In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments”, in order to reduce current diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The adoption at January 1, 2018 of ASU 2016-15 did not have a material effect on the Company’s financial statements. In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business”, which introduces amendments that are intended to clarify the definition of a business to assist companies and other reporting organizations with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments are intended to narrow the current interpretation of a business. The adoption at January 1, 2018 of ASU No. 2017-01 did not have a material effect on the Company’s financial statements. In March 2017, the FASB issued ASU 2017-07, “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Costs,” to improve the presentation of net periodic pension cost and net periodic pos tretirement benefit cost. The amendments require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. In May, 2017, the FASB issued ASU 2017-09, “Stock Compensation (Topic 718): Scope of Modification Accounting”, which clarifies when modification accounting should be applied to changes in terms or conditions of share-based payment awards. The amendments narrow the scope of modification accounting by clarifying that modification accounting should be applied to awards if the change affects the fair value, vesting conditions, or classification of the award. The amendments do not impact current disclosure requirements for modifications, regardless of whether modification accounting is required under the new guidance. The adoption of ASU 2017-09 at January 1, 2018 did not have a material effect on the Company’s financial statements. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities.” ASU 2017-12 amends the hedge accounting recognition and presentation requirements in ASC 815 to improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities to better align the entity’s financial reporting for hedging relationships with those risk management activities and to reduce the complexity of and simplify the application of hedge accounting. The Company elected to early adopt the provisions of ASU 2017-12 at January 1, 2018 which did not have a material effect on the Company’s financial statements. Pending Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, “Leases” . In June 2016, the FASB has issued ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”. The guidance is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments. The guidance will replace the current incurred loss accounting model with an expected loss approach and requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The guidance requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company is evaluating the effect of adopting this new accounting guidance. In January 2017, the FASB issued ASU No. 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment”, which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Therefore, any carrying amount which exceeds the reporting unit’s fair value (up to the amount of goodwill recorded) will be recognized as an impairment loss. ASU No. 2017-04 will be effective for annual reporting periods beginning after December 15, 2019, including interim reporting periods within those periods. The amendments will be applied prospectively on or after the effective date. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. Based on recent goodwill impairments tests, which did not require the application of Step 2, the Company does not expect the adoption of this ASU to have an immediate impact. In March 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities”, which will shorten the amortization period for callable debt securities held at a premium to the earliest call date instead of the maturity date. The amendments do not require an accounting change for securities held at a discount, which will continue to be amortized to the maturity date. ASU No. 2017-08 will be effective for annual reporting periods beginning after December 15, 2018, including interim reporting periods within those periods. The amendments should be applied using a modified-retrospective transition method as of the beginning of the period of adoption. Early adoption is permitted, including adoption in an interim period. The Company is currently assessing this pronouncement and it is not expected to have a material impact on the Company’s financial condition or results of operations.

Securities

Securities	3 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Securities	Note 2—Securities A summary of amortized cost and estimated fair value of securities, excluding equity securities with readily determinable fair values not held for trading, at March 31, 2018 and December 31, 2017 is as follows: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value March 31, 2018 Securities available-for-sale: U.S. Treasury securities $ 100,535 $ — $ 4,605 $ 95,930 Obligations of U.S. government agencies 99,807 367 339 99,835 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 99,529 261 2,248 97,542 Issued by FNMA and FHLMC 442,887 711 10,513 433,085 Other residential mortgage-backed securities 44,269 20 1,468 42,821 Commercial mortgage-backed securities 75,666 — 4,930 70,736 Total MBS 662,351 992 19,159 644,184 Obligations of states and municipal subdivisions 419,246 2,019 15,209 406,056 Total securities available-for-sale $ 1,281,939 $ 3,378 $ 39,312 $ 1,246,005 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value December 31, 2017 Securities available-for-sale: U.S. Treasury securities $ 100,575 $ — $ 3,731 $ 96,844 Obligations of U.S. government agencies 80,552 738 66 81,224 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 106,461 676 1,110 106,027 Issued by FNMA and FHLMC 431,409 1,284 2,271 430,422 Other residential mortgage-backed securities 47,379 97 1,084 46,392 Commercial mortgage-backed securities 76,201 63 4,069 72,195 Total MBS 661,450 2,120 8,534 655,036 Obligations of states and municipal subdivisions 420,111 7,539 3,691 423,959 Total securities available-for-sale $ 1,262,688 $ 10,397 $ 16,022 $ 1,257,063 Securities held-to-maturity: Obligations of states and municipal subdivisions $ 290 $ 21 $ — $ 311 The Company elected to reclassify the one held-to-maturity security as of December 31, 2017 to available-for-sale as of March 31, 2018 under the transition election guidance in ASC Topic 815. The adoption of ASU 2016-01 resulted in a classification change of equity securities from securities available-for-sale to equity securities with readily determinable fair values not held for trading. The Company recorded an adjustment of $95 thousand to retained earnings for the adoption of the accounting principle. The scheduled contractual maturities of securities available-for-sale and securities held-to-maturity at March 31, 2018 were as follows: Available-for-Sale Amortized Estimated (In thousands) Cost Fair Value Due in one year or less $ — $ — Due after one year through five years 109,319 104,751 Due after five years through ten years 15,984 15,994 Due after ten years 494,285 481,076 Mortgage-backed securities 662,351 644,184 Total $ 1,281,939 $ 1,246,005 Gross gains and gross losses on sales of securities available for sale for the three months ended March 31, 2018 and 2017 are presented below. There were no other-than-temporary impairment charges included in gross realized losses for the three months ended March 31, 2018 and 2017. 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) 2018 2017 Gross realized gains $ 12 $ 81 Gross realized losses — — Realized gains on sale of securities available for sale, net $ 12 $ 81 Securities with a carrying value of $533.1 million and $507.3 million at March 31, 2018 and December 31, 2017, respectively, were pledged to secure public and trust deposits, FHLB borrowings, repurchase agreements and for other purposes as required or permitted by law. The detail concerning securities classified as available-for-sale with unrealized losses as of March 31, 2018 and December 31, 2017 was as follows: Unrealized loss analysis Losses < 12 Months Losses > 12 Months Gross Gross Estimated Unrealized Estimated Unrealized (In thousands) Fair Value Losses Fair Value Losses March 31, 2018 U.S. Treasury securities $ — $ — $ 95,930 $ 4,605 Obligations of U.S. government agencies 58,217 245 11,531 94 Mortgage-backed securities 403,703 9,022 174,381 10,137 Obligations of states and municipal subdivisions 171,740 3,892 127,466 11,317 Total $ 633,660 $ 13,159 $ 409,308 $ 26,153 Unrealized loss analysis Losses < 12 Months Losses > 12 Months Gross Gross Estimated Unrealized Estimated Unrealized (In thousands) Fair Value Losses Fair Value Losses December 31, 2017 U.S. Treasury securities $ — $ — $ 96,844 $ 3,731 Obligations of U.S. government agencies 1,577 9 14,323 57 Mortgage-backed securities 306,274 1,490 172,324 7,044 Obligations of states and municipal subdivisions 2,601 22 134,870 3,669 Total $ 310,452 $ 1,521 $ 418,361 $ 14,501 There were no securities classified as held-to-maturity with unrealized losses as of March 31, 2018 and December 31, 2017. As of March 31, 2018 and December 31, 2017, approximately 84% and 58%, respectively, of the fair value of securities in the investment portfolio reflected an unrealized loss. As of March 31, 2018, there were 89 securities that had been in a loss position for more than twelve months, and 138 securities that had been in a loss position for less than 12 months. None of the unrealized losses relate to the marketability of the securities or the issuer’s ability to honor redemption of the obligations. 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 and Allowance for Credit

Loans and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans and Allowance for Credit Losses	Note 3—Loans and Allowance for Credit Losses The following table presents total loans outstanding by portfolio segment and class of financing receivable as of March 31, 2018 and December 31, 2017. Outstanding balances also include Acquired Noncredit Impaired (“ANCI”) loans, originated loans and Acquired Credit Impaired (“ACI”) loans net of any remaining purchase accounting adjustments. Information about ACI loans is presented separately in the “Acquired Credit-Impaired Loans” section of this Note. As of (In thousands) March 31, 2018 December 31, 2017 Commercial and Industrial General C&I $ 3,005,397 $ 2,746,454 Restaurant industry 1,078,904 1,035,538 Energy sector 984,200 935,371 Healthcare 432,274 416,423 Total commercial and industrial 5,500,775 5,133,786 Commercial Real Estate Income producing 1,076,067 1,082,929 Land and development 80,343 75,472 Total commercial real estate 1,156,410 1,158,401 Consumer Residential real estate 1,721,819 1,690,814 Other 63,059 74,922 Total consumer 1,784,878 1,765,736 Small Business Lending 235,337 221,855 Total (Gross of unearned discount and fees) 8,677,400 8,279,778 Unearned discount and fees (30,413 ) (26,351 ) Total (Net of unearned discount and fees) $ 8,646,987 $ 8,253,427 Allowance for Credit Losses (“ACL”) The ACL is management’s estimate of credit losses inherent in the loan portfolio at the balance sheet date. The Company has an established process to determine the adequacy of the ACL that assesses the losses inherent in our portfolio. While management attributes portions of the ACL to specific portfolio segments, the entire ACL is available to absorb credit losses inherent in the total loan portfolio. The ACL process involves procedures that appropriately consider the unique risk characteristics of the loan portfolio segments based on management’s assessment of the underlying risks and cash flows. For each portfolio segment, losses are estimated collectively for groups of loans with similar characteristics, individually for impaired loans or, for ACI loans, based on the changes in cash flows expected to be collected on a pool or individual basis. The level of the ACL is influenced by loan volumes, risk rating migration, historic loss experience influencing loss factors, and other conditions influencing loss expectations, such as economic conditions. The primary indicator of credit quality for the portfolio segments is its internal risk ratings. The assignment of loan risk ratings is the primary responsibility of the lending officer and is subject to independent review by internal credit review, which also performs ongoing, independent review of the risk management process. Credit review is centralized and independent of the lending function. The credit review results are reported to senior management and the Board of Directors. A summary of the activity in the ACL for the three months ended March 31, 2018 and 2017: For the Three Months Ended March 31, 2018 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Small Business Total As of December 31, 2017 $ 55,919 $ 11,990 $ 14,983 $ 4,684 $ 87,576 Provision for loan losses 5,330 (513 ) (903 ) 466 4,380 Charge-offs (58 ) — (301 ) (453 ) (812 ) Recoveries 18 209 103 63 393 As of March 31, 2018 $ 61,209 $ 11,686 $ 13,882 $ 4,760 $ 91,537 Allocation of ending ACL Loans collectively evaluated for impairment $ 52,535 $ 11,684 $ 13,639 $ 4,738 $ 82,596 Loans individually evaluated for impairment 8,674 2 243 22 8,941 ACL as of March 31, 2018 $ 61,209 $ 11,686 $ 13,882 $ 4,760 $ 91,537 Loans Loans collectively evaluated for impairment $ 5,433,850 $ 1,148,486 $ 1,782,604 $ 234,912 $ 8,599,852 Loans individually evaluated for impairment 66,925 7,924 2,274 425 77,548 Loans as of March 31, 2018 $ 5,500,775 $ 1,156,410 $ 1,784,878 $ 235,337 $ 8,677,400 For the Three Months Ended March 31, 2017 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Small Business Total As of December 31, 2016 $ 54,688 $ 10,103 $ 13,265 $ 4,212 $ 82,268 Provision for loan losses 5,097 438 211 40 5,786 Charge-offs (310 ) — (241 ) — (551 ) Recoveries 532 14 63 192 801 As of March 31, 2017 $ 60,007 $ 10,555 $ 13,298 $ 4,444 $ 88,304 Allocation of ending ACL Loans collectively evaluated for impairment $ 50,006 $ 10,550 $ 13,031 $ 4,397 $ 77,984 Loans individually evaluated for impairment 10,001 5 267 47 10,320 ACL as of March 31, 2017 $ 60,007 $ 10,555 $ 13,298 $ 4,444 $ 88,304 Loans Loans collectively evaluated for impairment $ 4,545,395 $ 1,084,936 $ 1,569,763 $ 203,649 $ 7,403,743 Loans individually evaluated for impairment 168,086 10,407 1,887 919 181,299 Loans as of March 31, 2017 $ 4,713,481 $ 1,095,343 $ 1,571,650 $ 204,568 $ 7,585,042 Loans Held-for-sale The Company had held-for-sale (“HFS”) loans totaling $37.4 million as of March 31, 2018 consisting of $34.9 million in commercial loans and $2.5 million in mortgage loans. Impaired Originated and ANCI Loans Including TDRs The following includes certain key information about individually impaired originated and ANCI loans as of March 31, 2018 and December 31, 2017 and for the three months ended March 31, 2018 and 2017. Originated and ANCI Loans Identified as Impaired As of March 31, 2018 (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments With no related allowance for credit losses Commercial and Industrial General C&I $ 189 $ 197 $ — $ 189 $ — Energy sector 8,711 10,903 — 8,711 5 Total commercial and industrial 8,900 11,101 — 8,900 5 Consumer Residential real estate 1,083 1,088 — 34 — Other 277 276 — — — Total consumer 1,360 1,364 — 34 — Small Business Lending 239 695 — 239 — Total $ 10,499 $ 13,160 $ — $ 9,173 $ 5 With allowance for credit losses recorded Commercial and Industrial General C&I $ 4,759 $ 4,737 $ 3 $ — $ — Energy sector 32,549 40,287 7,202 21,791 1,810 Restaurant industry 10,969 10,969 1,469 10,969 2,500 Total commercial and industrial 48,277 55,993 8,674 32,761 4,310 Consumer Residential real estate 494 491 35 — — Other 103 103 — — — Total consumer 597 594 35 — — Small Business Lending 186 463 22 55 — Total $ 49,060 $ 57,050 $ 8,731 $ 32,816 $ 4,310 As of December 31, 2017 (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments With no related allowance for credit losses Commercial and Industrial General C&I $ 5,010 $ 4,994 $ — $ 192 $ — Energy sector 14,822 23,307 — 14,822 387 Total commercial and industrial 19,832 28,301 — 15,014 387 Consumer Residential real estate 1,093 1,097 — 35 — Other 416 415 — — — Total consumer 1,509 1,512 — 35 — Small Business Lending 249 695 — 249 — Total $ 21,590 $ 30,508 $ — $ 15,298 $ 387 With allowance for credit losses recorded Commercial and Industrial Energy sector $ 39,857 $ 43,416 $ 8,353 $ 28,000 $ 402 Restaurant industry 11,017 10,969 106 — 2,500 Total commercial and industrial 50,874 54,385 8,459 28,000 2,902 Consumer Residential real estate 496 494 36 — — Small Business Lending 650 921 27 60 — Total $ 52,020 $ 55,800 $ 8,522 $ 28,060 $ 2,902 (1) The recorded investment of a loan also includes any interest receivable, net unearned discount or fees, and unamortized premium or discount. The related amount of interest income recognized for impaired loans was $239 thousand for the three months ended March 31, 2018 compared to $403 thousand for the same period in 2017. Generally, cash receipts on nonperforming loans are used to reduce principal rather than recorded as interest income. Past due status is determined based upon contractual terms. A nonaccrual loan may be returned to accrual status when repayment is reasonably assured and there has been demonstrated performance under the terms of the loan or, if applicable, under the terms of the restructured loan. Approximately $0.3 million of contractual interest paid was recognized on the cash basis for the three months ended March 31, 2018 compared to $0.2 million for same period in 2017. Average Recorded Investment in Impaired Originated and ANCI Loans Three Months Ended March 31, (In thousands) 2018 2017 Commercial and Industrial General C&I $ 4,979 $ 12,455 Restaurant industry 10,993 — Energy sector 47,969 126,370 Total commercial and industrial 63,941 138,825 Consumer Residential real estate 1,583 1,164 Other 398 388 Total consumer 1,981 1,552 Small Business Lending 662 930 Total $ 66,584 $ 141,307 Included in impaired loans are loans considered to be 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. Current amendments to the accounting guidance preclude a creditor from using the effective interest rate test in the debtor’s guidance on restructuring of payables (ASC 470-60-55-10) when evaluating whether a restructuring constitutes a TDR. All TDRs are reported as impaired. Impaired 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 majority of TDRs are classified as impaired loans for the remaining life of the loan. Nonperforming loans and impaired loans are defined differently. Some loans may be included in both categories, whereas other loans may only be included in one category. There were no originated or ANCI loans modified into a TDR for the three months ended March 31, 2018. There was one commercial and industrial loan with a recorded investment of $196 thousand modified into a TDR by a rate concession for the three months ended March 31, 2017. There were no TDRs experiencing payment default during the three months ended March 31, 2018 and 2017. Residential Mortgage Loans in Process of Foreclosure  Credit Exposure in the Originated and ANCI Loan Portfolios The following provides information regarding the credit exposure by portfolio segment and class of receivable as of March 31, 2018 and December 31, 2017: As of March 31, 2018 (Recorded Investment in thousands) Special Mention Substandard Doubtful Total Criticized / Classified Commercial and Industrial General C&I $ 93,231 $ 42,693 $ — $ 135,924 Restaurant industry 42,028 10,969 — 52,997 Energy sector 11,889 62,309 6,767 80,965 Healthcare — 68 — 68 Total commercial and industrial 147,148 116,039 6,767 269,954 Commercial Real Estate Land and development 19 — — 19 Total commercial real estate 19 — — 19 Consumer Residential real estate 7,529 10,933 — 18,462 Other 675 337 4 1,016 Total consumer 8,204 11,270 4 19,478 Small Business Lending 1,996 1,877 25 3,898 Total $ 157,367 $ 129,186 $ 6,796 $ 293,349 As of December 31, 2017 (Recorded Investment in thousands) Special Mention Substandard Doubtful Total Criticized / Classified Commercial and Industrial General C&I $ 80,550 $ 47,324 $ — $ 127,874 Restaurant industry 4,536 12,506 — 17,042 Energy sector — 99,979 7,634 107,613 Healthcare — 71 — 71 Total commercial and industrial 85,086 159,880 7,634 252,600 Commercial Real Estate Income producing — 26 — 26 Land and development 20 — — 20 Total commercial real estate 20 26 — 46 Consumer Residential real estate 7,610 12,416 — 20,026 Other 673 356 4 1,033 Total consumer 8,283 12,772 4 21,059 Small Business Lending 3,480 1,375 27 4,882 Total $ 96,869 $ 174,053 $ 7,665 $ 278,587 The following provides an aging of past due originated and ANCI loans by portfolio segment and class of receivable as of March 31, 2018 and December 31, 2017: Aging of Past due Originated and ANCI Loans As of March 31, 2018 Accruing Loans Non-Accruing Loans (Recorded Investment in thousands) 30-59 DPD 60-89 DPD 90+DPD 0-29 DPD 30-59 DPD 60-89 DPD 90+DPD Commercial and Industrial General C&I $ 63 $ — $ — $ — $ — $ 189 $ — Restaurant industry — — — 10,969 — — — Energy sector — — — 31,636 — — 5,633 Healthcare — — — — — — 68 Total commercial and industrial 63 — — 42,605 — 189 5,701 Commercial Real Estate Income producing 2 — — — — — — Land and development — — 53 — — — — Total commercial real estate 2 — 53 — — — — Consumer Residential real estate 3,756 542 280 1,172 445 258 1,276 Other 474 68 — — — — — Total consumer 4,230 610 280 1,172 445 258 1,276 Small Business Lending 168 29 — 343 35 36 156 Total $ 4,463 $ 639 $ 333 $ 44,120 $ 480 $ 483 $ 7,133 As of December 31, 2017 Accruing Loans Non-Accruing Loans (Recorded Investment in thousands) 30-59 DPD 60-89 DPD 90+DPD 0-29 DPD 30-59 DPD 60-89 DPD 90+DPD Commercial and Industrial General C&I $ 59 $ — $ 476 $ — $ 192 $ — $ — Energy sector — — — 32,315 — — 10,507 Healthcare — — — — 71 — — Total commercial and industrial 59 — 476 32,315 263 — 10,507 Commercial Real Estate Income producing — — 26 — — — — Land and development 55 — — — — — — Total commercial real estate 55 — 26 — — — — Consumer Residential real estate 3,191 1,030 325 1,070 173 293 2,205 Other 532 3 — — — — — Total consumer 3,723 1,033 325 1,070 173 293 2,205 Small Business Lending 931 328 — 110 38 — 494 Total $ 4,768 $ 1,361 $ 827 $ 33,495 $ 474 $ 293 $ 13,206 Acquired Credit Impaired (“ACI”) Loans The following table presents total ACI loans outstanding by portfolio segment and class of financing receivable as of March 31, 2018 and December 31, 2017. As of (In thousands) March 31, 2018 December 31, 2017 Commercial and Industrial General C&I $ 22,620 $ 23,428 Healthcare 6,033 6,149 Total commercial and industrial 28,653 29,577 Commercial Real Estate Income producing 77,554 79,861 Total commercial real estate 77,554 79,861 Consumer Residential real estate 142,293 149,942 Other 990 1,180 Total consumer 143,283 151,122 Total $ 249,490 $ 260,560 The excess of cash flows expected to be collected over the carrying value of ACI loans is referred to as the accretable yield and is recognized in interest income using an effective yield method over the remaining life of the loan, or pools of loans. The accretable yield is affected by: • Changes in interest rate indices for variable rate ACI loans—Expected future cash flows are based on the variable rates in effect at the time of the regular evaluations of cash flows expected to be collected; • Changes in prepayment assumptions—Prepayments affect the estimated life of ACI loans which may change the amount of interest income, and possibly principal, expected to be collected; and • Changes in the expected principal and interest payments over the estimated life—Updates to expected cash flows are driven by the credit outlook and actions taken with borrowers. Changes in the amount of accretable discount for ACI loans for the three months ended March 31, 2018 and 2017 were as follows: Changes in Accretable Yield on ACI Loans For the Three Months Ended March 31, (In thousands) 2018 2017 Balance at beginning of period $ 78,422 $ 98,728 Maturities/payoff (1,446 ) (1,769 ) Charge-offs (13 ) (79 ) Foreclosure (255 ) (798 ) Accretion (5,192 ) (6,331 ) Reclass from nonaccretable difference due to increases in expected cash flow 4,558 3,364 Balance at end of period $ 76,074 $ 93,115 Impaired ACI Loans and Pools Including TDRs The following includes certain key information about individually impaired ACI loans and pooled ACI loans as of March 31, 2018 and December 31, 2017 and for the three months ended March 31, 2018 and 2017. ACI Loans / Pools Identified as Impaired As of March 31, 2018 ACI Loans / Pools Identified as Impaired (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments Commercial and Industrial $ 13,668 $ 17,838 $ 1,914 $ — $ — Commercial Real Estate 87,135 122,460 — — — Consumer 23,018 26,887 6,448 — — Total $ 123,821 $ 167,185 $ 8,362 $ — $ — As of December 31, 2017 ACI Loans / Pools Identified as Impaired (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments Commercial and Industrial $ 13,541 $ 17,630 $ 5 $ — $ — Commercial Real Estate 82,856 112,330 2,010 225 — Consumer 18,603 22,064 6,509 — — Total $ 115,000 $ 152,024 $ 8,524 $ 225 $ — (1) The recorded investment of a loan also includes any interest receivable, net unearned discount or fees, and unamortized premium or discount. ACI Loans that Were Modified into TDRs There were no ACI loans modified into a TDR for the three months ended March 31, 2018. In the three months ended March 31, 2017, there was one ACI loan modified into a TDR with a recorded investment of $954 thousand. There were no ACI TDRs experiencing payment default during the three months ended March 31, 2018 and 2017. Credit Exposure in the ACI Portfolio The following provides information regarding the credit exposure by portfolio segment and class of receivable as of March 31, 2018 and December 31, 2017: ACI Loans by Risk Rating / Delinquency Stratification Commercial and Industrial credit exposure on ACI loans, based on internal risk rating: As of March 31, 2018 December 31, 2017 (Recorded Investment in thousands) Special Mention Substandard Doubtful Special Mention Substandard Doubtful Commercial and Industrial General C&I $ 700 $ 1,150 $ 38 $ 737 $ 1,173 $ 37 Healthcare — 6,033 — — 6,148 — Total commercial and industrial 700 7,183 38 737 7,321 37 Commercial Real Estate Income producing 1,708 5,642 — 2,179 6,515 — Total commercial real estate 1,708 5,642 — 2,179 6,515 — Consumer Residential real estate 3,824 20,531 — 3,900 22,635 — Other 104 324 — 114 417 — Total consumer 3,928 20,855 — 4,014 23,052 — Total $ 6,336 $ 33,680 $ 38 $ 6,930 $ 36,888 $ 37 Consumer credit exposure on ACI loans, based on past due status: As of March 31, 2018 December 31, 2017 (Recorded Investment in thousands) Residential Real Estate Other Residential Real Estate Other 0 – 29 Days Past Due $ 133,543 $ 1,318 $ 139,662 $ 1,356 30 – 59 Days Past Due 3,216 14 2,299 120 60 – 89 Days Past Due 1,898 61 2,496 62 90 – 119 Days Past Due 798 — 399 — 120 + Days Past Due 5,108 — 7,480 45 Total $ 144,563 $ 1,393 $ 152,336 $ 1,583

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 4—Goodwill and Other Intangible Assets The following table summarizes the Company’s goodwill and other intangible assets at March 31, 2018 and December 31, 2017: (In thousands) March 31, 2018 December 31, 2017 Goodwill $ 317,817 $ 317,817 Core deposit intangible, net of accumulated amortization of $38,493 and $38,091, respectively 1,193 1,595 Customer lists, net of accumulated amortization of $18,487 and $18,097, respectively 8,213 8,604 Trademarks 24 24 Total goodwill and intangible assets $ 327,247 $ 328,040

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	Note 5—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 in 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 effective portion of the gain or loss related to the derivative instrument is recognized as a component of other comprehensive income and subsequently reclassified as interest income when the forecasted transaction affects income. The ineffective portion of the gain or loss is recognized immediately as noninterest income. The notional amounts and estimated fair values as of March 31, 2018 and December 31, 2017 were as follows: March 31, 2018 December 31, 2017 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 $ 1,032,000 $ — $ 32,481 $ 1,032,000 $ — $ 21,394 Derivatives not designated as hedging instruments: Commercial loan interest rate swaps 701,111 2,390 2,390 737,533 2,056 2,056 Commercial loan interest rate caps 183,744 270 270 186,290 153 153 Commercial loan interest rate floors 328,420 2,463 2,463 330,764 1,054 1,054 Mortgage loan held for sale interest rate lock commitments 9,740 110 — 6,119 50 — Mortgage loan forward sale commitments 403 — — 4,565 10 — Mortgage loan held for sale floating commitments 14,111 — — 11,800 — — Foreign exchange contracts 44,825 1,070 1,030 41,688 635 623 Total derivatives not designated as hedging instruments 1,282,354 6,303 6,153 1,318,759 3,958 3,886 Total derivatives $ 2,314,354 $ 6,303 $ 38,634 $ 2,350,759 $ 3,958 $ 25,280 The Company is party to collateral support agreements with certain derivative counterparties. Such agreements require that the Company maintain collateral based on the fair values of derivative transactions. In the event of default by the Company, the counterparty would be entitled to the collateral. At March 31, 2018 and December 31, 2017, the Company was required to post $27.6 million and $20.1 Gain (loss) included in the consolidated statements of income related to derivative instruments for the three months ended March 31, 2018 and 2017 were as follows: For the Three Months Ended March 31, 2018 2017 (In thousands) OCI Reclassified from AOCI to interest income Noninterest income OCI Reclassified from AOCI to interest income Noninterest income Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ (11,278 ) $ (333 ) $ — $ (1,590 ) $ 1,867 $ — Derivatives not designated as hedging instruments: Mortgage loan held for sale interest rate lock commitments $ — $ — $ 61 $ — $ — $ 178 Foreign exchange contracts — — 508 — — 470 Interest Rate Swap and Cap Agreements not designated as hedging derivatives The Company enters into certain interest rate swap, floor and cap 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 or cap with a loan customer while at the same time entering into an offsetting interest rate swap or cap with another financial institution. In connection with each swap transaction, the Company agrees to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The interest rate swap transaction allows the Company’s customer to effectively convert a variable rate loan to a fixed rate. The interest rate cap transaction allows the Company’s customer to minimize interest rate risk exposure to rising interest rates. Because the Company acts as an intermediary for its customer, changes in the fair value of the underlying derivative contracts for the most part offset each other and do not significantly impact the Company’s consolidated statements of income. The Company is exposed to credit loss in the event of nonperformance by the parties to the interest rate swap and cap 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, 2018 and December 31, 2017. 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 to manage overall cash flow changes related to interest rate risk exposure on benchmark interest rate loans. In June 2015 and March 2016, the Company entered into the following interest rate swap agreements to manage overall cash flow changes related to interest rate risk exposure on benchmark interest rate loans. Effective Date Maturity Date Notional Amount (In Thousands) Fixed Rate Variable Rate June 15, 2015 December 17, 2018 $ 382,000 1.3250 % 1 Month LIBOR June 30, 2015 December 31, 2019 300,000 1.5120 1 Month LIBOR March 8, 2016 February 27, 2026 175,000 1.5995 1 Month LIBOR March 8, 2016 February 27, 2026 175,000 1.5890 1 Month LIBOR Based on our current interest rate forecast, $7.8 million of deferred net loss on derivatives in OCI at March 31. 2018 is estimated to be reclassified into net interest income during the next twelve months. Future changes to interest rates may significantly change actual amounts reclassified to income. There were no reclassifications into income during 2018 or 2017 as a result of any discontinuance of cash flow hedges because the forecasted transaction was no longer probable. The maximum length of time over which the Company is hedging a portion of its exposure to the variability in future cash flows for forecasted transactions is approximately eight years as of March 31, 2018.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2018
Banking And Thrift [Abstract]
Deposits	Note 6—Deposits Domestic time deposits $250,000 and over were $401.9 million and $382.4 million at March 31, 2018 and December 31, 2017, respectively. There were no foreign time deposits at either March 31, 2018 or December 31, 2017.

Borrowed Funds

Borrowed Funds	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Borrowed Funds	Note 7—Borrowed Funds Repurchase Agreements Securities sold under agreements to repurchase generally mature within one to seven days from the transaction date. Securities underlying the repurchase agreements remain under the control of the Company. Information concerning the Company’s securities sold under agreements to repurchase as of March 31, 2018 and December 31, 2017 is summarized as follows: (In thousands) March 31, 2018 December 31, 2017 Balance at period end $ 1,298 $ 1,026 Average balance during the period 1,165 3,371 Average interest rate during the period 0.25 % 0.25 % Maximum month-end balance during the period $ 1,298 $ 6,286 Repurchase agreements are treated as collateralized financing obligations and are reflected as a liability in the consolidated balance sheets. Senior and Subordinated Debt In June 2014, the Company and the Bank completed an unregistered $245 million multi-tranche debt transaction and in March 2015, the Company completed an unregistered $50 million debt transaction. These transactions enhanced our liquidity and the Bank’s capital levels to support balance sheet growth. Details of the debt transactions are as follows: (In thousands) March 31, 2018 December 31, 2017 Cadence Bancorporation: 4.875% senior notes, due June 28, 2019 $ 145,000 $ 145,000 5.375% senior notes, due June 28, 2021 50,000 50,000 7.250% subordinated notes, due June 28, 2029, callable in 2024 35,000 35,000 6.500% subordinated notes, due March 2025, callable in 2020 40,000 40,000 Total long-term debt—Cadence Bancorporation 270,000 270,000 Cadence Bank: 6.250% subordinated notes, due June 28, 2029, callable in 2024 25,000 25,000 Debt issuance cost and unamortized premium (1,476 ) (1,606 ) Purchased 4.875% senior notes, due June 28, 2019 (10,078 ) (10,078 ) Total long-term debt $ 283,446 $ 283,316 The senior transactions were structured with 4 and 7 year maturities to provide holding company liquidity and to stagger the Company’s debt maturity profile. The $35 million and $25 million subordinated debt transactions were structured with a 15 year maturity, 10 year call options, and fixed-to-floating interest rates in order to maximize regulatory capital treatment. These subordinated debt structures were designed to achieve full Tier 2 capital treatment for 10 years. The $40 million subordinated debt transaction has a 5 year call option. The Company’s senior notes are unsecured, unsubordinated obligations and are equal in right of payment to all of the Company’s other unsecured debt. The Company’s subordinated notes are unsecured obligations and will be subordinated in right of payment to all of the Company’s senior indebtedness and general creditors and to depositors at the Bank. The Company’s senior notes and subordinated notes are not guaranteed by any subsidiary of the Company, including the Bank. The Bank’s subordinated notes are unsecured obligations and are subordinated in right of payment to all of the Bank’s senior indebtedness and general creditors and to depositors of the Bank. The Bank’s subordinated notes are not guaranteed by the Company or any subsidiary of the Bank. Payment of principal on the Company’s and Bank’s subordinated notes may be accelerated by holders of such subordinated notes only in the case of certain insolvency events. There is no right of acceleration under the subordinated notes in the case of default. The Company and/or the Bank may be required to obtain the prior written approval of the Federal Reserve, and, in the case of the Bank, the OCC, before it may repay the subordinated notes issued thereby upon acceleration or otherwise. Junior Subordinated Debentures In conjunction with the Company’s acquisition of Cadence Financial Corporation and Encore Bank, N.A., the junior subordinated debentures were marked to their fair value as of their respective acquisition dates. The related mark is being amortized over the remaining term of the junior subordinated debentures. The following is a list of junior subordinated debt: (In thousands) March 31, 2018 December 31, 2017 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 (14,028 ) (14,147 ) Total junior subordinated debentures $ 36,591 $ 36,472 Advances from FHLB and Borrowings from FRB FHLB advances are collateralized by deposits with the FHLB, FHLB stock and loans. FHLB advances were $150 million as of March 31, 2018 and December 31, 2017. The advances as of December 31, 2017 matured in January 2018. The advances as of March 31, 2018 are fixed rate and will mature in February 2019. Any advances are collateralized by $1.4 billion of commercial and residential real estate loans pledged under a blanket lien arrangement as of March 31, 2018. As of March 31, 2018 and December 31, 2017, the FHLB has issued for the benefit of the Bank irrevocable letters of credit totaling $586.5 million and $386.5 million, respectively. The Bank has a $35 million irrevocable letter of credit in favor of the State of Alabama SAFE Program to secure certain deposits of the State of Alabama. This letter of credit expires September 27, 2018 upon 45 days’ prior notice of non-renewal; otherwise it automatically extends for a successive one-year term. The Bank also has a $550 million irrevocable letter of credit to secure a large treasury management deposit. This letter of credit expires May 26, 2018 upon 45 days’ prior notice of non-renewal; otherwise it automatically extends for a successive one-year term. There were no borrowings from the FRB discount window as of March 31, 2018 and December 31, 2017. Any borrowings from the FRB will be collateralized by $826.8 million in commercial loans pledged under a borrower-in-custody arrangement.

Other Noninterest Income and Ot

Other Noninterest Income and Other Noninterest Expense	3 Months Ended
	Mar. 31, 2018
Other Nonoperating Income Expense [Abstract]
Other Noninterest Income and Other Noninterest Expense	Note 8—Other Noninterest Income and Other Noninterest Expense The detail of the other noninterest income and other noninterest expense captions presented in the consolidated statements of income is as follows: Three Months Ended March 31, (In thousands) 2018 2017 Other noninterest income Insurance revenue $ 2,259 $ 2,130 Bankcard fees 1,884 1,812 Income from bank owned life insurance policies 935 1,059 Other 132 476 Total other noninterest income $ 5,210 $ 5,477 Three Months Ended March 31, (In thousands) 2018 2017 Other noninterest expenses Net cost of operation of other real estate owned $ (52 ) $ 296 Data processing expense 2,365 1,696 Consulting and professional fees 2,934 1,139 Loan related expenses 255 280 FDIC Insurance 955 1,493 Communications 704 655 Advertising and public relations 341 345 Legal expenses 2,627 471 Other 6,074 5,745 Total other noninterest expenses $ 16,203 $ 12,120

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 9—Income Taxes Income tax expense for the three months ended March 31, 2018 was $11.0 million compared to $12.6 million for the same period in 2017. The effective tax rate was 22.0% for the three months ended March 31, 2018 compared to 32.6% for the same period in 2017. The decrease in the effective tax rate for the three months ended March 31, 2018 compared to the three months ended March 31, 2017 was primarily driven by the decrease in the statutory Federal tax rate established by The Tax Cuts and Jobs Act (“Tax Reform”) enacted on December 22, 2017. The effective tax rate is primarily affected by the amount of pre-tax income, 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. As a result of Tax Reform enacted on December 22, 2017, deferred taxes are based on the newly enacted U.S. federal statutory income tax rate of 21%. Deferred taxes as of March 31, 2017 are based on the previously enacted U.S. statutory federal income tax rate of 35%. The provisional amount recorded related to the remeasurement of the Company’s deferred tax asset was $19.0 million, which was recorded in the fourth quarter of 2017 as income tax expense. Based on the information available and our current interpretation of Tax Reform, the Company has made reasonable estimates of the impact from the reduction in the U.S. federal statutory rate on the remeasurement of the deferred tax asset. However, the Company’s deferred tax asset will continue to be evaluated in the context of Tax Reform, and may change as a result of evolving management interpretations, elections, and assumptions, as well as new guidance that may be issued by the Internal Revenue Service. Management expects to complete its analysis within the measurement period in accordance with SAB 118. Nonetheless, there has been no change to the provisional net tax benefit we recorded in the fourth quarter of 2017.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Note 10—Earnings Per Common Share The following table displays a reconciliation of the information used in calculating basic and diluted net income per common share for the three months ended March 31, 2018 and 2017. Three Months Ended March 31, (In thousands, except per share data) 2018 2017 Net income $ 38,825 $ 26,117 Weighted average common shares outstanding (Basic) 83,625,000 75,000,000 Weighted average restricted stock units 1,049,807 672,750 Weighted average common shares outstanding (Diluted) 84,674,807 75,672,750 Earnings per common share (Basic) $ 0.46 $ 0.35 Earnings per common share (Diluted) $ 0.46 $ 0.35

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Note 11—Related Party Transactions In the normal course of business, loans are made to directors and executive officers and to companies in which they have a significant ownership interest. In the opinion of management, these loans are made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other parties, are consistent with sound banking practices, and are within applicable regulatory and lending limitations. The aggregate balances of related party loans and deposits as of March 31, 2018 and December 31, 2017 were insignificant.

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2018
Banking And Thrift [Abstract]
Regulatory Matters	Note 12—Regulatory Matters The Bank is subject to the capital adequacy requirements of the OCC. The Company, as a bank holding company, is subject to the capital adequacy requirements of the Federal Reserve. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgment by regulators about components, risk weightings, and other related factors. The risk-based capital requirements of the Federal Reserve and the OCC define capital and establish minimum capital requirements in relation to assets and off-balance sheet exposure, adjusted for credit risk. The risk-based capital standards currently in effect are designed to make regulatory capital requirements sensitive to differences in risk profiles among bank holding companies and banks, to account for off-balance sheet exposure and to minimize disincentives for holding liquid assets. Assets and off-balance sheet items are assigned to broad risk categories, each with appropriate relative risk weights. The resulting capital ratios represent capital as a percentage of total risk-weighted assets and off-balance sheet items. The Federal Reserve, the FDIC and the OCC have issued guidelines governing the levels of capital that banks must maintain. The bank guidelines for the period as of March 31, 2018 specify capital tiers, which include the following classifications: Capital Tiers Tier 1 Capital to Average Assets (Leverage) Common Risk - Weighted Assets (CET1) Tier 1 Capital to Risk – Weighted Assets Total Capital to Risk – Weighted Assets Well capitalized 5% or above 6.5% or above 8% or above 10% or above Adequately capitalized 4% or above 4.5% or above 6% or above 8% or above Undercapitalized Less than 4% Less than 4.5% Less than 6% Less than 8% Significantly undercapitalized Less than 3% Less than 3% Less than 4% Less than 6% Critically undercapitalized Tangible Equity / Total Assets less than 2% The most recent notification from the OCC categorized the Bank as well-capitalized under the regulatory framework for prompt corrective action (the prompt corrective action requirements are not applicable to the Company). The actual capital amounts and ratios for the Company and the bank as of March 31, 2018 and December 31, 2017 are presented in the following table and as shown, are above the thresholds necessary to be considered “well-capitalized”. Management believes there are no conditions or events that would change that classification in the foreseeable future. Consolidated Company Bank (In thousands) Amount Ratio Amount Ratio March 31, 2018 Tier 1 leverage $ 1,120,451 10.6 % $ 1,225,079 11.6 % Common equity tier 1 capital 1,081,809 10.4 1,175,079 11.3 Tier 1 risk-based capital 1,120,451 10.8 1,225,079 11.8 Total risk-based capital 1,311,834 12.6 1,342,433 12.9 The minimum amounts of capital and ratios established by banking regulators are as follows: Tier 1 leverage $ 423,950 4.0 % $ 423,855 4.0 % Common equity tier 1 capital 467,253 4.5 467,093 4.5 Tier 1 risk-based capital 623,004 6.0 622,790 6.0 Total risk-based capital 830,672 8.0 830,387 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A $ 529,818 5.0 % Common equity tier 1 capital N/A N/A 674,689 6.5 Tier 1 risk-based capital N/A N/A 830,387 8.0 Total risk-based capital N/A N/A 1,037,984 10.0 Consolidated Company Bank (In thousands) Amount Amount Amount Ratio December 31, 2017 Tier 1 leverage $ 1,096,438 10.7 % $ 1,198,234 11.7 % Common equity tier 1 (transitional) 1,058,888 10.6 1,149,181 11.5 Tier 1 risk-based capital 1,096,438 10.9 1,198,234 12.0 Total risk-based capital 1,283,561 12.8 1,311,376 13.1 The minimum amounts of capital and ratios established by banking regulators are as follows: Tier 1 leverage $ 410,770 4.0 % $ 410,743 4.0 % Common equity tier 1 (transitional) 450,951 4.5 450,874 4.5 Tier 1 risk-based capital 601,269 6.0 601,165 6.0 Total risk-based capital 801,691 8.0 801,553 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A $ 513,429 5.0 % Common equity tier 1 (transitional) N/A N/A 651,262 6.5 Tier 1 risk-based capital N/A N/A 801,553 8.0 Total risk-based capital N/A N/A 1,001,941 10.0 Under regulations controlling national banks, the payment of any dividends by a bank without prior approval of the OCC is limited to the current year’s net profits (as defined by the OCC) and retained net profits of the two preceding years. 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. As the Company does not generate income on a stand-alone basis, it does not have the capability to pay common stock dividends without receiving dividends from the Bank. The Bank is required to maintain average reserve balances in the form of cash or deposits with the Federal Reserve Bank. The reserve balance varies depending upon the types and amounts of deposits. At March 31, 2018 and December 31, 2017, the required reserve balance with the Federal Reserve Bank was approximately $70.7 million and $70.9 million, respectively.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 13—Commitments and Contingent Liabilities The consolidated financial statements do not reflect various commitments and contingent liabilities which arise in the normal course of banking business and which involve elements of credit risk, interest rate risk, and liquidity risk. The commitments and contingent liabilities are commitments to extend credit, home equity lines, overdraft protection lines, and standby letters of credit. Such financial instruments are recorded when they are funded. A summary of commitments and contingent liabilities at March 31, 2018 is as follows: (In thousands) March 31, 2018 Commitments to extend credit $ 3,413,043 Commitments to grant loans 238,624 Standby letters of credit 98,701 Performance letters of credit 29,178 Commercial letters of credit 2,926 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. 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, 2018 and 2017. The Company does not anticipate any significant future losses as a result of these transactions. The Company makes investments in limited partnerships, including certain low income housing partnerships for which tax credits are received. As of March 31, 2018 and December 31, 2017, unfunded capital commitments totaled $22.6 million and $20.3 million, respectively. 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.

Concentrations of Credit

Concentrations of Credit	3 Months Ended
	Mar. 31, 2018
Risks And Uncertainties [Abstract]
Concentrations of Credit	Note 14—Concentrations of Credit Most of the loans, commitments and letters of credit involve customers or sponsors in the Company’s market areas. Investments in state and municipal securities also involve governmental entities within the Company’s market areas. General concentrations of credit by type of loan are set forth in Note 3 of these consolidated financial statements. The distribution of commitments to extend credit approximates the distribution of loans outstanding. Letters of credit were granted primarily to commercial borrowers.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Note 15—Supplemental Cash Flow Information For the Three Months Ended March 31, (In thousands) 2018 2017 Cash paid during the year for: Interest $ 19,217 $ 12,776 Income taxes, net of refunds (82 ) (219 ) Non-cash investing activities (at fair value): Transfers of loans to other real estate $ 1,548 $ 3,489 Transfers of commercial loans to loans held for sale 3,500 39,249

Disclosure About Fair Values of

Disclosure About Fair Values of Financial Instruments	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Disclosure About Fair Values of Financial Instruments	Note 16—Disclosure About Fair Values of Financial Instruments The Company groups its assets and liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. This hierarchy requires the Company to maximize the use of observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Each fair value measurement is placed into the proper level based on the lowest level of significant input. These levels are: • Level 1 —Valuation is based upon quoted prices for identical instruments traded in active markets. • Level 2 —Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level 3 —Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models, and similar techniques. Transfers between fair value levels are recognized at the end of the fiscal quarter in which the associated change in inputs occurs. 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, 2018 and December 31, 2017: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2018 Investment securities available-for-sale: U.S. Treasury securities $ 95,930 $ — $ 95,930 $ — Obligations of U.S. government agencies 99,835 — 99,835 — Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 97,542 — 97,542 — Issued by FNMA and FHLMC 433,085 — 433,085 — Other residential mortgage-backed securities 42,821 — 42,821 — Commercial mortgage-backed securities 70,736 — 70,736 — Total MBS 644,184 — 644,184 — Obligations of states and municipal subdivisions 406,057 — 406,057 — Total investment securities available-for-sale 1,246,006 — 1,246,006 — Equity securities with readily determinable fair values not held for trading 5,829 5,829 — — Derivative assets 6,303 — 6,303 — Net profits interests 14,295 — — 14,295 Investments in limited partnerships 7,514 — — 7,514 Total recurring basis measured assets $ 1,279,947 $ 5,829 $ 1,252,309 $ 21,809 Derivative liabilities $ 38,634 $ — $ 38,634 $ — Total recurring basis measured liabilities $ 38,634 $ — $ 38,634 $ — (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2017 Investment securities available-for-sale: U.S. Treasury securities $ 96,844 $ — $ 96,844 $ — Obligations of U.S. government agencies 81,224 — 81,224 — Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 106,027 — 106,027 — Issued by FNMA and FHLMC 430,422 — 430,422 — Other residential mortgage-backed securities 46,392 — 46,392 — Commercial mortgage-backed securities 72,195 — 72,195 — Total MBS 655,036 — 655,036 — Obligations of states and municipal subdivisions 423,959 — 423,959 — Total investment securities available-for-sale 1,257,063 — 1,257,063 — Equity securities with readily determinable fair values not held for trading 5,885 5,885 — — Derivative assets 3,985 — 3,985 — Net profits interests 15,833 — — 15,833 Total recurring basis measured assets $ 1,282,766 $ 5,885 $ 1,261,048 $ 15,833 Derivative liabilities $ 25,307 $ — $ 25,307 $ — Total recurring basis measured liabilities $ 25,307 $ — $ 25,307 $ — There were no transfers between the Level 1 and Level 2 fair value categories during the three months ended March 31, 2018 and 2017. Changes in Level 3 Fair Value Measurements The tables below include a roll-forward of the condensed consolidated balance sheet amounts for the three months ended March 31, 2018 and 2017 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 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, 2018 2017 2018 2017 (In thousands) Net Profits Interests Investments in Limited Partnerships Beginning Balance $ 15,833 $ 19,425 $ — $ — Transfers in due to adoption of ASU 2016-01 — — 5,518 — Adjustment recorded in retained earnings due to adoption of ASU 2016-01 — — 1,201 — Net (losses) gains included in earnings (869 ) (2,645 ) 676 — Contributions paid — — 225 — Distributions received (669 ) (230 ) (106 ) — Balance at March 31 $ 14,295 $ 16,550 $ 7,514 $ — Net unrealized (losses) gains included in earnings relating to assets held at the end of the period $ (869 ) $ (2,645 ) $ 676 $ — The fair value of the net profit interests in oil and gas reserves was estimated using discounted cash flow analyses applied to the expected cash flows from producing developed wells. Expected cash flows are derived from reports prepared by consulting engineers under established professional standards for the industry. These expected cash flow projections contain significant unobservable inputs regarding the net recoverable oil and gas reserves and forward-looking commodity prices discounted at a rate of 10%. Therefore, the fair value is subject to change based on these commodity markets. An increase of 5% in the discount rate would not produce a material change in the fair value of the net profits interest. The adoption of ASU 2016-01 on January 1, 2018 resulted in certain investments in limited partnerships being estimated using the net asset value “NAV” practical expedient provided by the partnership as allowed by ASC 820 for an equity security without a readily determinable fair value. These investments are within Level 3 of the valuation hierarchy and are measured on a recurring basis. Prior to the adoption of the accounting standard, these investments were accounted for under the cost method. On January 1, 2018, an adjustment of $1.2 million was recorded to retained earnings to account for the adoption of the accounting principle. 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, 2018 and December 31, 2017, 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, 2018 Loans held for sale $ 37,446 $ — $ 37,446 $ — Impaired loans, net of specific allowance 50,829 — — 50,829 Other real estate 6,642 — — 6,642 Total assets measured on a nonrecurring basis $ 94,917 $ — $ 37,446 $ 57,471 (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2017 Loans held for sale $ 61,359 $ — $ 61,359 $ — Impaired loans, net of specific allowance 65,087 — — 65,087 Other real estate 7,605 — — 7,605 Total assets measured on a nonrecurring basis $ 134,051 $ — $ 61,359 $ 72,692 The fair value of collateral-dependent impaired loans and OREO and the related fair value adjustments are generally based on unadjusted third-party appraisals. Appraisals that are not based on observable inputs or that require significant adjustments or fair value measurements that are not based on third-party appraisals are considered to be based on significant unobservable inputs. Nonrecurring fair value measurements of collateral dependent loans secured by oil and gas reserves and mineral rights are generally based on borrower provided or third-party reserve reports (which are reviewed by the Company’s engineering team) that utilize projected cash flows under current market conditions and include significant unobservable inputs. Projected cash flows are discounted according to risk characteristics of the underlying oil and gas properties. Assets are evaluated to demonstrate with reasonable certainty that crude oil, natural gas and natural gas liquids can be recovered from known oil and gas reservoirs under existing economic and operating conditions at current prices with existing conventional equipment, operating methods and costs. The significant unobservable inputs used in these valuations have been developed through our contacts with oil and gas industry participants, asset management and workout professionals and approved by senior management. Significant unobservable inputs used in Level 3 fair value measurements for financial assets measured at fair value on a nonrecurring basis at March 31, 2018 and December 31, 2017 are summarized below: Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range March 31, 2018 Impaired loans, net of specific allowance $ 50,829 Appraised value, as adjusted Discount to fair value 0% - 50% Discounted cash flow Net recoverable oil and gas reserves and forward-looking commodity prices. Discount rate - 9% to 10% 0% - 7% (1) Discounted cash flow Discount rates - 3.1% to 6.8% 0% - 2% (1) Estimated closing costs 10% Other real estate 6,642 Appraised value, as adjusted Discount to fair value 0% - 20% Estimated closing costs 10% (1) - Represents fair value as a percent of the unpaid principal balance. Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range December 31, 2017 Impaired loans, net of specific allowance $ 65,087 Appraised value, as adjusted Discount to fair value 0%-50% Discounted cash flow Net recoverable oil and gas reserves and forward-looking commodity prices. Discount rate - 9% 0% - 29% (1) Discounted cash flow Discount rates - 3.6% to 8.0% 0% - 1% (1) Estimated closing costs 10% Other real estate 7,605 Appraised value, as adjusted Discount of fair value 0%-20% Estimated closing costs 10% (1) - Represents fair value as a percent of the unpaid principal balance. Determination of Fair Values In accordance with ASC 820-10-35, fair values are based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following describes the assumptions and methodologies used to estimate the fair value of financial instruments recorded at fair value in the consolidated balance sheets and for estimating the fair value of financial instruments for which fair value is disclosed under ASC 825-10-50. Investment Securities . When quoted prices are available in an active market, securities are classified as Level 1. For securities reported at fair value utilizing Level 2 inputs, the Company obtains fair value measurements from an independent pricing service. These fair value measurements consider observable market data that may include benchmark yield curves, reported trades, broker/dealer quotes, issuer spreads and credit information, among other inputs. Loans Held for Sale . Loans held for sale are recorded at the lower of aggregate cost or fair value. Fair value is generally based on quoted market prices of similar loans and is considered to be Level 2. Net Loans . Loans are valued on an individual basis, with consideration given to the loans’ underlying characteristics, including account types, remaining terms, annual interest rates or coupons, interest types, accrual basis, timing of principal and interest payments, current market rates, and remaining balances. A discounted cash flow model is used to estimate the fair value of the loans using assumptions for the coupon rates, remaining maturities, prepayment speeds, projected default probabilities by risk grade, and estimates of prevailing discount rates. The discounted cash flow approach models the projected cash flows, applying various assumptions regarding interest and payment risks for the loans based on the loan types, payment types and fixed or variable classifications. For variable rate loans, forward interest rate curves are integrated into the projection of cash flows. The forward curves are index specific and obtained from a leading third-party provider. Future coupon payments are determined based upon the applicable forward curve, spread, next repricing date, and repricing frequency. Derivative Financial Instruments . Derivative financial instruments are measured at fair value based on modeling that utilizes observable market inputs for various interest rates published by leading third-party financial news and data providers. This is observable data that represents the rates used by market participants for instruments entered into at that date; however, they are not based on actual transactions so they are classified as Level 2. Net profits interests. The fair value of the net profit interests in oil and gas reserves was estimated using discounted cash flow analyses applied to the expected cash flows from producing developed wells. Expected cash flows are derived from reports prepared by consulting engineers under established professional standards for the industry. Investments in Limited Partnerships. The fair value of certain investments in limited partnerships was estimated using the net asset value practical expedient provided by the partnership as allowed by ASC 820 for an equity security without a readily determinable fair value. Deposits . The fair values disclosed for demand deposits are, by definition, equal to the amount payable on demand at the reporting date (that is, their carrying amounts). Fair values for CDs are estimated using a discounted cash flow calculation that applies interest rate spreads to current Treasury yields. FHLB . The fair value of the FHLB advance approximates its book value. Security Sold Under Agreements to Repurchase . The carrying amount of security repurchase agreements approximates their fair values. Senior Debt . The fair value of senior debt was estimated by obtaining broker indications that compared the Company’s senior debt to other comparable financial institutions. Subordinated Debt. The fair value of subordinated debentures was estimated by obtaining broker indications that compared the Company’s subordinated debentures to other comparable financial institutions. Junior Subordinated Debentures. The fair value of junior subordinated debentures was estimated by obtaining broker indications that compared the Company’s junior subordinated debentures to other comparable financial institutions. Limitations . The following fair value estimates are determined as of a specific point in time utilizing various assumptions and estimates. The use of assumptions and various valuation techniques, as well as the absence of secondary markets for certain financial instruments, will likely reduce the comparability of fair value disclosures between financial institutions. The fair values for loans involve the use of significant internally-developed pricing assumptions due to market-illiquidity for loans net of unearned income and loans held for sale as of March 31, 2018 and December 31, 2017. These assumptions are considered to reflect inputs that market participants would use in transactions involving these instruments as of the measurement date. This table only includes financial instruments of the Company, and, accordingly, the total of the fair value amounts does not represent, and should not be construed to represent, the underlying value of the Company. The estimated fair values of the Company’s financial instruments are as follows: As of March 31, 2018 Carrying (In thousands) Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 130,704 $ 130,704 $ 130,704 $ — $ — Interest-bearing deposits in other banks 281,297 281,297 281,297 — — Federal funds sold 4,695 4,695 4,695 — — Securities available-for-sale 1,246,005 1,246,005 — 1,246,005 — Equity securities with readily determinable fair values not held for trading 5,829 5,829 5,829 — — Loans held for sale 37,446 37,446 — 37,446 — Net loans 8,555,450 8,437,656 — — 8,437,656 Derivative assets 6,303 6,303 — 6,303 — Net profits interests 14,295 14,295 — — 14,295 Investments in limited partnerships 7,514 7,514 — — 7,514 Financial Liabilities: Deposits 9,048,971 9,045,299 — 9,045,299 — Advances from FHLB 150,000 150,000 — 150,000 — Securities sold under agreements to repurchase 1,298 1,298 — 1,298 — Senior debt 184,700 193,529 — 193,529 — Subordinated debt 98,746 98,101 — 98,101 — Junior subordinated debentures 36,591 49,019 — 49,019 — Derivative liabilities 38,634 38,634 — 38,634 — As of December 31, 2017 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 238,707 $ 238,707 $ 238,707 $ — $ — Interest-bearing deposits in other banks 482,568 482,568 482,568 — — Federal funds sold 9,536 9,536 9,536 — — Securities available-for-sale 1,257,063 1,257,063 — 1,257,063 — Securities held-to-maturity 290 311 — 311 — Equity securities with readily determinable fair values not held for trading 5,885 5,885 5,885 — — Loans held for sale 61,359 61,359 — 61,359 — Net loans 8,165,851 8,134,903 — — 8,134,903 Derivative assets 3,985 3,985 — 3,985 — Net profits interests 15,833 15,833 — — 15,833 Financial Liabilities: Deposits 9,011,515 9,006,890 — 9,006,890 — Advances from FHLB 150,000 150,000 — 150,000 — Securities sold under agreements to repurchase 1,026 1,026 — 1,026 — Senior debt 184,629 194,484 — 194,484 — Subordinated debt 98,687 94,724 — 94,724 — Junior subordinated debentures 36,472 49,161 — 49,161 — Derivative liabilities 25,307 25,307 — 25,307 —

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segment Reporting	Note 17—Segment Reporting The Company determines reportable segments based on the services offered, the significance of the services offered, the significance of those services to the Company’s financial condition and operating results and management’s regular review of the operating results of those services. The Company operates through three operating segments: Banking, Financial Services and Corporate. The Banking Segment includes the Commercial Banking, Retail Banking and Private Banking lines of business. The Commercial Banking line of business includes a general business services component primarily focusing on commercial & industrial (C&I), community banking, business banking and commercial real estate lending to clients in the geographic footprint in Texas and the southeast United States. In addition, the Commercial Banking line of business includes within C&I a separate component that focuses on select industries (which is referred to as the “specialized industries”) in which the Company believes it has specialized experience and service capabilities, including energy, healthcare, restaurant industry, and technology. The Company serves clients in these specialized industries both within the geographic footprint and throughout the United States as a result of the national orientation of many of these businesses. The Retail Banking line of business offers a broad range of retail banking services including mortgage services through the branch network to serve the needs of consumer and small businesses in the geographic footprint. The Private Banking line of business offers banking services and loan products tailored to the needs of the high-net worth clients in the geographic footprint. The Financial Services Segment includes the Trust, Retail Brokerage, Investment Services and Insurance businesses. These businesses offer products independently to their own customers as well as to Banking Segment clients. Investment Services operates through the “Linscomb & Williams” name and Insurance operates though the “Cadence Insurance” name. The products offered by the businesses in the Financial Services Segment primarily generate non-banking service fee income. The Corporate Segment reflects parent-only activities and intercompany eliminations. Business segment results are determined based upon the management reporting system, which assigns balance sheet and income statement items to each of the business segments. The process is designed around the organizational and management structure and, accordingly, the results derived are not necessarily comparable with similar information published by other financial institutions or in accordance with generally accepted accounting principles. The Company evaluates performance and allocates resources based on profit or loss from operations. There are no material inter-segment sales or transfers. The accounting policies used by each reportable segment are the same as those discussed in Note 1. 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, 2018 and 2017: For the Three Months Ended March 31, 2018 (In thousands) Banking Financial Services Corporate Consolidated Net interest income $ 96,100 $ (607 ) $ (4,382 ) $ 91,111 Provision for credit losses 4,380 — — 4,380 Noninterest income 12,438 12,358 187 24,983 Noninterest expense 50,532 9,977 1,430 61,939 Income tax expense (benefit) 12,446 308 (1,804 ) 10,950 Net income (loss) $ 41,180 $ 1,466 $ (3,821 ) $ 38,825 Total assets $ 10,903,031 $ 91,468 $ 4,883 $ 10,999,382 For the Three Months Ended March 31, 2017 (In thousands) Banking Financial Services Corporate Consolidated Net interest income $ 79,103 $ 784 $ (5,129 ) $ 74,758 Provision for credit losses 5,786 — — 5,786 Noninterest income 11,700 12,321 84 24,105 Noninterest expense 45,457 8,681 183 54,321 Income tax expense (benefit) 13,846 1,548 (2,755 ) 12,639 Net income (loss) $ 25,714 $ 2,876 $ (2,473 ) $ 26,117 Total assets $ 9,629,061 $ 88,644 $ 3,232 $ 9,720,937

Equity-based Compensation

Equity-based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-based Compensation	Note 18—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 7,500,000 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 6,827,250 at March 31, 2018 assuming applicable performance goals are satisfied at target levels. The Company recorded $0.4 million equity-based compensation expense for the outstanding restricted stock units for each of the three month periods ended March 31, 2018 and 2017, respectively. The remaining expense related to unvested restricted stock units is $1.0 million as of March 31, 2018 and will be recognized over the next 8 months. There were 672,750 outstanding non-vested restricted stock units with a grant date fair value of $5.14. There were no grants or forfeitures for the three months ended March 31, 2018. See “Note 21-Subsequent Events” for additional information.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 19—Accumulated Other Comprehensive Loss Activity within the balances in accumulated other comprehensive loss is shown in the following tables for the three months ended March 31, 2018. ` Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on defined benefit pension plans Unrealized gains (losses) on derivative instruments designated as cash flow hedges Accumulated other comprehensive gain (loss) Balance, December 31, 2017 $ (2,160 ) $ (531 ) $ (16,342 ) $ (19,033 ) Net change (23,401 ) — (8,377 ) (31,778 ) Balance, March 31, 2018 $ (25,561 ) $ (531 ) $ (24,719 ) $ (50,811 )

Variable Interest Entities and

Variable Interest Entities and Other Investments	3 Months Ended
	Mar. 31, 2018
Variable Interest Entities And Other Investments [Abstract]
Variable Interest Entities and Other Investments	Note 20—Variable Interest Entities and Other Investments Under ASC 810-10-65, the Company is deemed to be the primary beneficiary and required to consolidate a variable interest entity (“VIE”) if it has a variable interest in the VIE that provides it with a controlling financial interest. For such purposes, the determination of whether a controlling financial interest exists is based on whether a single party has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the obligation to absorb the losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. ASC 810-10-65, as amended, requires continual reconsideration of conclusions reached regarding which interest holder is a VIE’s primary beneficiary. The Bank has invested in several affordable housing projects as a limited partner. The partnerships have qualified to receive annual affordable housing federal tax credits that are recognized as a reduction of current tax expense. The Company has determined that these structures meet the definition of VIE’s under Topic ASC 810 but that consolidation is not required, as the Bank is not the primary beneficiary. At March 31, 2018 and December 31, 2017, 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, 2018 and December 31, 2017, the Company had recorded investments in other assets on its consolidated balance sheets of approximately $7.5 million and $7.9 million, respectively related to these investments. Additionally, the Company invests in other certain limited partnerships accounted for under the fair value practical expedient of net asset value totaling $7.5 million as of March 31, 2018. The company recognized a $0.7 million gain for the three months ended March 31, 2018 related to these assets recorded at fair value through net income. Certain other limited partnerships without readily determinable fair values that do not qualify for the practical expedient are accounted for at its cost minus impairment, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. These investments totaled $8.7 million as of March 31, 2018. Other limited partnerships are accounted for under the equity method totaling $8.8 million as of March 31, 2018. As of December 31, 2017 and prior to the adoption of ASU 2016-01, certain limited partnerships were accounted for under the cost method totaling $14.0 million and the equity method totaling $8.8 million. The following table presents a summary of the Company’s investments in limited partnerships subsequent to the adoption of ASU 2016-01 and as of March 31, 2018: (In thousands) As of March 31, 2018 Affordable housing projects (amortized cost) $ 7,479 Limited partnerships accounted for under the fair value practical expedient of NAV 7,514 Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method 8,692 Limited partnerships required to be accounted for under the equity method 8,797 Total investments in limited partnerships $ 32,482 During 2016, the Bank received net profits interests in oil and gas reserves, in connection with the reorganization under bankruptcy of two loan customers. The Company has determined that these contracts meet the definition of VIE’s under Topic ASC 810, but that consolidation is not required as the Bank is not the primary beneficiary. The net profits interests are financial instruments and recorded at estimated fair value, which was $14.3 million and $15.8 million at March 31, 2018 and December 31, 2017, respectively, representing the maximum exposure to loss as of that date. The Company has established a rabbi trust related to the deferred compensation plan offered to certain of its employees. The Company contributes employee cash compensation deferrals to the trust. The assets of the trust are available to creditors of the Company only in the event the Company becomes insolvent. This trust is considered a VIE because either there is no equity at risk in the trust or because the Company provided the equity interest to its employees in exchange for services rendered. The Company is considered the primary beneficiary of the rabbi trust as it has the ability to select the underlying investments made by the trust, the activities that most significantly impact the economic performance of the rabbi trust. The Company includes the assets of the rabbi trust as a component of other assets and a corresponding liability for the associated benefit obligation in other liabilities in its consolidated balance sheets. At March 31, 2018 and December 31, 2017, the amount of rabbi trust assets and benefit obligation was $3.7 million and $3.6 million, respectively.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 21—Subsequent Events On April 2, 2018, the Company granted 270,105 shares of stock-based awards in the form of restricted stock units pursuant to and subject to the provisions of the Amended and Restated Cadence Bancorporation 2015 Omnibus Incentive Plan. While the grant specifies a stated target number of units, the determination of the actual settlement in shares will be based in part on the achievement of certain financial performance measures of the Company over the three years ended December 31, 2020. For half of the units granted, these performance conditions will determine the actual units vested on March 31, 2021 and can be in the range of zero to two times the units granted. The remaining half of the restricted stock units vest equally on March 31 of each of the next three years. On April 25, 2018, the Board of Directors of the Company declared a quarterly cash dividend in the amount of $0.125 per share of common stock, representing an annualized dividend of $0.50 per share. The dividend will be paid on June 15, 2018 to holders of record of the Class A common stock on June 1, 2018. On May 13, 2018, the Company and State Bank Financial Corporation (“State Bank”) jointly announced the entry into a definitive merger agreement in a stock-for-stock transaction and has filed a Current Report on Form 8-K. Under the terms of the merger agreement, State Bank shareholders will receive 1.160 shares of the Company’s Class A common stock for each share of State Bank common stock, valuing the transaction at approximately $1.4 billion based on the closing share price of Cadence of $30.23 on May 11, 2018. After closing, legacy Cadence and State Bank shareholders will collectively own approximately 65% and 35% of the combined company, respectively. Closing is subject to customary approvals by regulators and the shareholders of State Bank, and is expected to occur in the fourth quarter of 2018. In April 2018, the Company entered into a plan to sell the Company’s subsidiary, Town & Country Insurance Agency, Inc. (“T&C”) and classified this business line as held-for-sale, which requires lower of cost or fair value accounting. In May 2018, T&C entered into an Asset Purchase Agreement with an unrelated third party for the purpose of selling approximately $16 million in net assets. This transaction is expected to close in the second quarter of 2018 and result in a slight after-tax gain.

Summary of Accounting Policies

Summary of Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying unaudited condensed 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, 2017. Operating results for the period ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The Company and its subsidiaries follow accounting principles generally accepted in the United States of America, including, where applicable, general practices within the banking industry. The 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 (Note 20). Certain amounts reported in prior years have been reclassified to conform to the 2018 presentation. These reclassifications did not materially impact the Company’s consolidated balance sheets or consolidated statements of income.
Nature of Operations	Nature of Operations The Company’s subsidiaries include: • Town & Country Insurance Agency, Inc., dba Cadence Insurance—full service insurance agency • The Bank The Bank operates under a national bank charter and is subject to regulation by the Office of the Comptroller of the Currency (OCC). The Bank provides lending services in Georgia and full banking services in five southern states: Alabama, Florida, Mississippi, Tennessee, and Texas. The Bank’s subsidiaries include: • Linscomb & Williams Inc. —financial advisory firm; and • Cadence Investment Services, Inc.—provides investment and insurance products, The Company and the Bank also have certain other non-operating and immaterial subsidiaries.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to significant change in the near term are the allowance for credit losses, valuation of and accounting for acquired credit impaired loans, valuation of goodwill, intangible assets and deferred income taxes.
Recently Adopted and Pending Accounting Pronouncements	Recently Adopted Accounting Pronouncements In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (ASU 2014-09), which is intended to improve and converge the financial reporting requirements for revenue contracts with customers. Previous accounting guidance comprised broad revenue recognition concepts along with numerous industry-specific requirements. The new guidance establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. Our major sources of revenue are from financial instruments that have been excluded from the scope of the new standard (including loans, derivatives, debt and equity securities, etc.). The standard required us to change how we recognize certain recurring revenue streams within insurance commissions and fees and other categories of noninterest income. The adoption at January 1, 2018 of ASU 2014-09 did not have a material effect on the Company’s financial statements. In January 2016, the FASB issued ASU 2016-01, “Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities”. ASU 2016-1, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheets, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheets or the accompanying notes to the financial statements and (viii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. The adoption at January 1, 2018 of ASU 2016-01 resulted in an adjustment to retained earnings of $1.0 million at January 1, 2018 related to fair value measurement changes to equity securities and certain limited partnership investments (See Notes 2, 16 and 20). In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments”, in order to reduce current diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The adoption at January 1, 2018 of ASU 2016-15 did not have a material effect on the Company’s financial statements. In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business”, which introduces amendments that are intended to clarify the definition of a business to assist companies and other reporting organizations with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments are intended to narrow the current interpretation of a business. The adoption at January 1, 2018 of ASU No. 2017-01 did not have a material effect on the Company’s financial statements. In March 2017, the FASB issued ASU 2017-07, “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Costs,” to improve the presentation of net periodic pension cost and net periodic pos tretirement benefit cost. The amendments require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. In May, 2017, the FASB issued ASU 2017-09, “Stock Compensation (Topic 718): Scope of Modification Accounting”, which clarifies when modification accounting should be applied to changes in terms or conditions of share-based payment awards. The amendments narrow the scope of modification accounting by clarifying that modification accounting should be applied to awards if the change affects the fair value, vesting conditions, or classification of the award. The amendments do not impact current disclosure requirements for modifications, regardless of whether modification accounting is required under the new guidance. The adoption of ASU 2017-09 at January 1, 2018 did not have a material effect on the Company’s financial statements. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities.” ASU 2017-12 amends the hedge accounting recognition and presentation requirements in ASC 815 to improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities to better align the entity’s financial reporting for hedging relationships with those risk management activities and to reduce the complexity of and simplify the application of hedge accounting. The Company elected to early adopt the provisions of ASU 2017-12 at January 1, 2018 which did not have a material effect on the Company’s financial statements. Pending Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, “Leases” . In June 2016, the FASB has issued ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”. The guidance is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments. The guidance will replace the current incurred loss accounting model with an expected loss approach and requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The guidance requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company is evaluating the effect of adopting this new accounting guidance. In January 2017, the FASB issued ASU No. 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment”, which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Therefore, any carrying amount which exceeds the reporting unit’s fair value (up to the amount of goodwill recorded) will be recognized as an impairment loss. ASU No. 2017-04 will be effective for annual reporting periods beginning after December 15, 2019, including interim reporting periods within those periods. The amendments will be applied prospectively on or after the effective date. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. Based on recent goodwill impairments tests, which did not require the application of Step 2, the Company does not expect the adoption of this ASU to have an immediate impact. In March 2017, the FASB issued ASU No. 2017-08, “Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities”, which will shorten the amortization period for callable debt securities held at a premium to the earliest call date instead of the maturity date. The amendments do not require an accounting change for securities held at a discount, which will continue to be amortized to the maturity date. ASU No. 2017-08 will be effective for annual reporting periods beginning after December 15, 2018, including interim reporting periods within those periods. The amendments should be applied using a modified-retrospective transition method as of the beginning of the period of adoption. Early adoption is permitted, including adoption in an interim period. The Company is currently assessing this pronouncement and it is not expected to have a material impact on the Company’s financial condition or results of operations.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Value of Securities Excluding Equity Securities With Readily Determinable Fair Values Not Held For Trading	A summary of amortized cost and estimated fair value of securities, excluding equity securities with readily determinable fair values not held for trading, at March 31, 2018 and December 31, 2017 is as follows: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value March 31, 2018 Securities available-for-sale: U.S. Treasury securities $ 100,535 $ — $ 4,605 $ 95,930 Obligations of U.S. government agencies 99,807 367 339 99,835 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 99,529 261 2,248 97,542 Issued by FNMA and FHLMC 442,887 711 10,513 433,085 Other residential mortgage-backed securities 44,269 20 1,468 42,821 Commercial mortgage-backed securities 75,666 — 4,930 70,736 Total MBS 662,351 992 19,159 644,184 Obligations of states and municipal subdivisions 419,246 2,019 15,209 406,056 Total securities available-for-sale $ 1,281,939 $ 3,378 $ 39,312 $ 1,246,005 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value December 31, 2017 Securities available-for-sale: U.S. Treasury securities $ 100,575 $ — $ 3,731 $ 96,844 Obligations of U.S. government agencies 80,552 738 66 81,224 Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 106,461 676 1,110 106,027 Issued by FNMA and FHLMC 431,409 1,284 2,271 430,422 Other residential mortgage-backed securities 47,379 97 1,084 46,392 Commercial mortgage-backed securities 76,201 63 4,069 72,195 Total MBS 661,450 2,120 8,534 655,036 Obligations of states and municipal subdivisions 420,111 7,539 3,691 423,959 Total securities available-for-sale $ 1,262,688 $ 10,397 $ 16,022 $ 1,257,063 Securities held-to-maturity: Obligations of states and municipal subdivisions $ 290 $ 21 $ — $ 311 The Company elected to reclassify the one held-to-maturity security as of December 31, 2017 to available-for-sale as of March 31, 2018 under the transition election guidance in ASC Topic 815. The adoption of ASU 2016-01 resulted in a classification change of equity securities from securities available-for-sale to equity securities with readily determinable fair values not held for trading. The Company recorded an adjustment of $95 thousand to retained earnings for the adoption of the accounting principle.
Schedule of Contractual Maturities of Securities Available-for-Sale and Securities Held-to-Maturity	The scheduled contractual maturities of securities available-for-sale and securities held-to-maturity at March 31, 2018 were as follows: Available-for-Sale Amortized Estimated (In thousands) Cost Fair Value Due in one year or less $ — $ — Due after one year through five years 109,319 104,751 Due after five years through ten years 15,984 15,994 Due after ten years 494,285 481,076 Mortgage-backed securities 662,351 644,184 Total $ 1,281,939 $ 1,246,005
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, 2018 and 2017 are presented below. For the Three Months Ended March 31, (In thousands) 2018 2017 Gross realized gains $ 12 $ 81 Gross realized losses — — Realized gains on sale of securities available for sale, net $ 12 $ 81
Schedule of Securities Classified as Available-for-Sale with Unrealized Losses	The detail concerning securities classified as available-for-sale with unrealized losses as of March 31, 2018 and December 31, 2017 was as follows: Unrealized loss analysis Losses < 12 Months Losses > 12 Months Gross Gross Estimated Unrealized Estimated Unrealized (In thousands) Fair Value Losses Fair Value Losses March 31, 2018 U.S. Treasury securities $ — $ — $ 95,930 $ 4,605 Obligations of U.S. government agencies 58,217 245 11,531 94 Mortgage-backed securities 403,703 9,022 174,381 10,137 Obligations of states and municipal subdivisions 171,740 3,892 127,466 11,317 Total $ 633,660 $ 13,159 $ 409,308 $ 26,153 Unrealized loss analysis Losses < 12 Months Losses > 12 Months Gross Gross Estimated Unrealized Estimated Unrealized (In thousands) Fair Value Losses Fair Value Losses December 31, 2017 U.S. Treasury securities $ — $ — $ 96,844 $ 3,731 Obligations of U.S. government agencies 1,577 9 14,323 57 Mortgage-backed securities 306,274 1,490 172,324 7,044 Obligations of states and municipal subdivisions 2,601 22 134,870 3,669 Total $ 310,452 $ 1,521 $ 418,361 $ 14,501

Loans and Allowance for Credi33

Loans and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
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, 2018 and December 31, 2017. Outstanding balances also include Acquired Noncredit Impaired (“ANCI”) loans, originated loans and Acquired Credit Impaired (“ACI”) loans net of any remaining purchase accounting adjustments. Information about ACI loans is presented separately in the “Acquired Credit-Impaired Loans” section of this Note. As of (In thousands) March 31, 2018 December 31, 2017 Commercial and Industrial General C&I $ 3,005,397 $ 2,746,454 Restaurant industry 1,078,904 1,035,538 Energy sector 984,200 935,371 Healthcare 432,274 416,423 Total commercial and industrial 5,500,775 5,133,786 Commercial Real Estate Income producing 1,076,067 1,082,929 Land and development 80,343 75,472 Total commercial real estate 1,156,410 1,158,401 Consumer Residential real estate 1,721,819 1,690,814 Other 63,059 74,922 Total consumer 1,784,878 1,765,736 Small Business Lending 235,337 221,855 Total (Gross of unearned discount and fees) 8,677,400 8,279,778 Unearned discount and fees (30,413 ) (26,351 ) Total (Net of unearned discount and fees) $ 8,646,987 $ 8,253,427
Summary of Allowance for Credit Losses	A summary of the activity in the ACL for the three months ended March 31, 2018 and 2017: For the Three Months Ended March 31, 2018 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Small Business Total As of December 31, 2017 $ 55,919 $ 11,990 $ 14,983 $ 4,684 $ 87,576 Provision for loan losses 5,330 (513 ) (903 ) 466 4,380 Charge-offs (58 ) — (301 ) (453 ) (812 ) Recoveries 18 209 103 63 393 As of March 31, 2018 $ 61,209 $ 11,686 $ 13,882 $ 4,760 $ 91,537 Allocation of ending ACL Loans collectively evaluated for impairment $ 52,535 $ 11,684 $ 13,639 $ 4,738 $ 82,596 Loans individually evaluated for impairment 8,674 2 243 22 8,941 ACL as of March 31, 2018 $ 61,209 $ 11,686 $ 13,882 $ 4,760 $ 91,537 Loans Loans collectively evaluated for impairment $ 5,433,850 $ 1,148,486 $ 1,782,604 $ 234,912 $ 8,599,852 Loans individually evaluated for impairment 66,925 7,924 2,274 425 77,548 Loans as of March 31, 2018 $ 5,500,775 $ 1,156,410 $ 1,784,878 $ 235,337 $ 8,677,400 For the Three Months Ended March 31, 2017 (In thousands) Commercial and Industrial Commercial Real Estate Consumer Small Business Total As of December 31, 2016 $ 54,688 $ 10,103 $ 13,265 $ 4,212 $ 82,268 Provision for loan losses 5,097 438 211 40 5,786 Charge-offs (310 ) — (241 ) — (551 ) Recoveries 532 14 63 192 801 As of March 31, 2017 $ 60,007 $ 10,555 $ 13,298 $ 4,444 $ 88,304 Allocation of ending ACL Loans collectively evaluated for impairment $ 50,006 $ 10,550 $ 13,031 $ 4,397 $ 77,984 Loans individually evaluated for impairment 10,001 5 267 47 10,320 ACL as of March 31, 2017 $ 60,007 $ 10,555 $ 13,298 $ 4,444 $ 88,304 Loans Loans collectively evaluated for impairment $ 4,545,395 $ 1,084,936 $ 1,569,763 $ 203,649 $ 7,403,743 Loans individually evaluated for impairment 168,086 10,407 1,887 919 181,299 Loans as of March 31, 2017 $ 4,713,481 $ 1,095,343 $ 1,571,650 $ 204,568 $ 7,585,042
Summary of Impaired Loans	The following includes certain key information about individually impaired originated and ANCI loans as of March 31, 2018 and December 31, 2017 and for the three months ended March 31, 2018 and 2017. Originated and ANCI Loans Identified as Impaired As of March 31, 2018 (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments With no related allowance for credit losses Commercial and Industrial General C&I $ 189 $ 197 $ — $ 189 $ — Energy sector 8,711 10,903 — 8,711 5 Total commercial and industrial 8,900 11,101 — 8,900 5 Consumer Residential real estate 1,083 1,088 — 34 — Other 277 276 — — — Total consumer 1,360 1,364 — 34 — Small Business Lending 239 695 — 239 — Total $ 10,499 $ 13,160 $ — $ 9,173 $ 5 With allowance for credit losses recorded Commercial and Industrial General C&I $ 4,759 $ 4,737 $ 3 $ — $ — Energy sector 32,549 40,287 7,202 21,791 1,810 Restaurant industry 10,969 10,969 1,469 10,969 2,500 Total commercial and industrial 48,277 55,993 8,674 32,761 4,310 Consumer Residential real estate 494 491 35 — — Other 103 103 — — — Total consumer 597 594 35 — — Small Business Lending 186 463 22 55 — Total $ 49,060 $ 57,050 $ 8,731 $ 32,816 $ 4,310 As of December 31, 2017 (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments With no related allowance for credit losses Commercial and Industrial General C&I $ 5,010 $ 4,994 $ — $ 192 $ — Energy sector 14,822 23,307 — 14,822 387 Total commercial and industrial 19,832 28,301 — 15,014 387 Consumer Residential real estate 1,093 1,097 — 35 — Other 416 415 — — — Total consumer 1,509 1,512 — 35 — Small Business Lending 249 695 — 249 — Total $ 21,590 $ 30,508 $ — $ 15,298 $ 387 With allowance for credit losses recorded Commercial and Industrial Energy sector $ 39,857 $ 43,416 $ 8,353 $ 28,000 $ 402 Restaurant industry 11,017 10,969 106 — 2,500 Total commercial and industrial 50,874 54,385 8,459 28,000 2,902 Consumer Residential real estate 496 494 36 — — Small Business Lending 650 921 27 60 — Total $ 52,020 $ 55,800 $ 8,522 $ 28,060 $ 2,902 (1) The recorded investment of a loan also includes any interest receivable, net unearned discount or fees, and unamortized premium or discount.
Originated and Acquired Non Credit Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Summary of Average Recorded Investment in Impaired Originated and ANCI Loans	Average Recorded Investment in Impaired Originated and ANCI Loans Three Months Ended March 31, (In thousands) 2018 2017 Commercial and Industrial General C&I $ 4,979 $ 12,455 Restaurant industry 10,993 — Energy sector 47,969 126,370 Total commercial and industrial 63,941 138,825 Consumer Residential real estate 1,583 1,164 Other 398 388 Total consumer 1,981 1,552 Small Business Lending 662 930 Total $ 66,584 $ 141,307
Summary of Credit Exposure by Portfolio Segment and Class of Receivable	The following provides information regarding the credit exposure by portfolio segment and class of receivable as of March 31, 2018 and December 31, 2017: As of March 31, 2018 (Recorded Investment in thousands) Special Mention Substandard Doubtful Total Criticized / Classified Commercial and Industrial General C&I $ 93,231 $ 42,693 $ — $ 135,924 Restaurant industry 42,028 10,969 — 52,997 Energy sector 11,889 62,309 6,767 80,965 Healthcare — 68 — 68 Total commercial and industrial 147,148 116,039 6,767 269,954 Commercial Real Estate Land and development 19 — — 19 Total commercial real estate 19 — — 19 Consumer Residential real estate 7,529 10,933 — 18,462 Other 675 337 4 1,016 Total consumer 8,204 11,270 4 19,478 Small Business Lending 1,996 1,877 25 3,898 Total $ 157,367 $ 129,186 $ 6,796 $ 293,349 As of December 31, 2017 (Recorded Investment in thousands) Special Mention Substandard Doubtful Total Criticized / Classified Commercial and Industrial General C&I $ 80,550 $ 47,324 $ — $ 127,874 Restaurant industry 4,536 12,506 — 17,042 Energy sector — 99,979 7,634 107,613 Healthcare — 71 — 71 Total commercial and industrial 85,086 159,880 7,634 252,600 Commercial Real Estate Income producing — 26 — 26 Land and development 20 — — 20 Total commercial real estate 20 26 — 46 Consumer Residential real estate 7,610 12,416 — 20,026 Other 673 356 4 1,033 Total consumer 8,283 12,772 4 21,059 Small Business Lending 3,480 1,375 27 4,882 Total $ 96,869 $ 174,053 $ 7,665 $ 278,587
Past Due Financing Receivables	The following provides an aging of past due originated and ANCI loans by portfolio segment and class of receivable as of March 31, 2018 and December 31, 2017: Aging of Past due Originated and ANCI Loans As of March 31, 2018 Accruing Loans Non-Accruing Loans (Recorded Investment in thousands) 30-59 DPD 60-89 DPD 90+DPD 0-29 DPD 30-59 DPD 60-89 DPD 90+DPD Commercial and Industrial General C&I $ 63 $ — $ — $ — $ — $ 189 $ — Restaurant industry — — — 10,969 — — — Energy sector — — — 31,636 — — 5,633 Healthcare — — — — — — 68 Total commercial and industrial 63 — — 42,605 — 189 5,701 Commercial Real Estate Income producing 2 — — — — — — Land and development — — 53 — — — — Total commercial real estate 2 — 53 — — — — Consumer Residential real estate 3,756 542 280 1,172 445 258 1,276 Other 474 68 — — — — — Total consumer 4,230 610 280 1,172 445 258 1,276 Small Business Lending 168 29 — 343 35 36 156 Total $ 4,463 $ 639 $ 333 $ 44,120 $ 480 $ 483 $ 7,133 As of December 31, 2017 Accruing Loans Non-Accruing Loans (Recorded Investment in thousands) 30-59 DPD 60-89 DPD 90+DPD 0-29 DPD 30-59 DPD 60-89 DPD 90+DPD Commercial and Industrial General C&I $ 59 $ — $ 476 $ — $ 192 $ — $ — Energy sector — — — 32,315 — — 10,507 Healthcare — — — — 71 — — Total commercial and industrial 59 — 476 32,315 263 — 10,507 Commercial Real Estate Income producing — — 26 — — — — Land and development 55 — — — — — — Total commercial real estate 55 — 26 — — — — Consumer Residential real estate 3,191 1,030 325 1,070 173 293 2,205 Other 532 3 — — — — — Total consumer 3,723 1,033 325 1,070 173 293 2,205 Small Business Lending 931 328 — 110 38 — 494 Total $ 4,768 $ 1,361 $ 827 $ 33,495 $ 474 $ 293 $ 13,206
ACI Loans
Accounts Notes And Loans Receivable [Line Items]
Summary of Total Loans Outstanding by Portfolio Segment and Class of Financing Receivable	Acquired Credit Impaired (“ACI”) Loans The following table presents total ACI loans outstanding by portfolio segment and class of financing receivable as of March 31, 2018 and December 31, 2017. As of (In thousands) March 31, 2018 December 31, 2017 Commercial and Industrial General C&I $ 22,620 $ 23,428 Healthcare 6,033 6,149 Total commercial and industrial 28,653 29,577 Commercial Real Estate Income producing 77,554 79,861 Total commercial real estate 77,554 79,861 Consumer Residential real estate 142,293 149,942 Other 990 1,180 Total consumer 143,283 151,122 Total $ 249,490 $ 260,560
Summary of Credit Exposure by Portfolio Segment and Class of Receivable	The following provides information regarding the credit exposure by portfolio segment and class of receivable as of March 31, 2018 and December 31, 2017: ACI Loans by Risk Rating / Delinquency Stratification Commercial and Industrial credit exposure on ACI loans, based on internal risk rating: As of March 31, 2018 December 31, 2017 (Recorded Investment in thousands) Special Mention Substandard Doubtful Special Mention Substandard Doubtful Commercial and Industrial General C&I $ 700 $ 1,150 $ 38 $ 737 $ 1,173 $ 37 Healthcare — 6,033 — — 6,148 — Total commercial and industrial 700 7,183 38 737 7,321 37 Commercial Real Estate Income producing 1,708 5,642 — 2,179 6,515 — Total commercial real estate 1,708 5,642 — 2,179 6,515 — Consumer Residential real estate 3,824 20,531 — 3,900 22,635 — Other 104 324 — 114 417 — Total consumer 3,928 20,855 — 4,014 23,052 — Total $ 6,336 $ 33,680 $ 38 $ 6,930 $ 36,888 $ 37
Past Due Financing Receivables	Consumer credit exposure on ACI loans, based on past due status: As of March 31, 2018 December 31, 2017 (Recorded Investment in thousands) Residential Real Estate Other Residential Real Estate Other 0 – 29 Days Past Due $ 133,543 $ 1,318 $ 139,662 $ 1,356 30 – 59 Days Past Due 3,216 14 2,299 120 60 – 89 Days Past Due 1,898 61 2,496 62 90 – 119 Days Past Due 798 — 399 — 120 + Days Past Due 5,108 — 7,480 45 Total $ 144,563 $ 1,393 $ 152,336 $ 1,583
Summary of Changes in Accretable Discount for ACI Loans	Changes in the amount of accretable discount for ACI loans for the three months ended March 31, 2018 and 2017 were as follows: Changes in Accretable Yield on ACI Loans For the Three Months Ended March 31, (In thousands) 2018 2017 Balance at beginning of period $ 78,422 $ 98,728 Maturities/payoff (1,446 ) (1,769 ) Charge-offs (13 ) (79 ) Foreclosure (255 ) (798 ) Accretion (5,192 ) (6,331 ) Reclass from nonaccretable difference due to increases in expected cash flow 4,558 3,364 Balance at end of period $ 76,074 $ 93,115
Summary of Individually Impaired ACI Loans and Pooled ACI Loans	The following includes certain key information about individually impaired ACI loans and pooled ACI loans as of March 31, 2018 and December 31, 2017 and for the three months ended March 31, 2018 and 2017. ACI Loans / Pools Identified as Impaired As of March 31, 2018 ACI Loans / Pools Identified as Impaired (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments Commercial and Industrial $ 13,668 $ 17,838 $ 1,914 $ — $ — Commercial Real Estate 87,135 122,460 — — — Consumer 23,018 26,887 6,448 — — Total $ 123,821 $ 167,185 $ 8,362 $ — $ — As of December 31, 2017 ACI Loans / Pools Identified as Impaired (In thousands) Recorded Investment in Impaired Loans (1) Unpaid Principal Balance Related Specific Allowance Nonaccrual Loans Included in Impaired Loans Undisbursed Commitments Commercial and Industrial $ 13,541 $ 17,630 $ 5 $ — $ — Commercial Real Estate 82,856 112,330 2,010 225 — Consumer 18,603 22,064 6,509 — — Total $ 115,000 $ 152,024 $ 8,524 $ 225 $ — (1) The recorded investment of a loan also includes any interest receivable, net unearned discount or fees, and unamortized premium or discount.

Goodwill and Other Intangible34

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Goodwill and Other Intangible Assets	The following table summarizes the Company’s goodwill and other intangible assets at March 31, 2018 and December 31, 2017: (In thousands) March 31, 2018 December 31, 2017 Goodwill $ 317,817 $ 317,817 Core deposit intangible, net of accumulated amortization of $38,493 and $38,091, respectively 1,193 1,595 Customer lists, net of accumulated amortization of $18,487 and $18,097, respectively 8,213 8,604 Trademarks 24 24 Total goodwill and intangible assets $ 327,247 $ 328,040

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 and December 31, 2017 were as follows: March 31, 2018 December 31, 2017 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 $ 1,032,000 $ — $ 32,481 $ 1,032,000 $ — $ 21,394 Derivatives not designated as hedging instruments: Commercial loan interest rate swaps 701,111 2,390 2,390 737,533 2,056 2,056 Commercial loan interest rate caps 183,744 270 270 186,290 153 153 Commercial loan interest rate floors 328,420 2,463 2,463 330,764 1,054 1,054 Mortgage loan held for sale interest rate lock commitments 9,740 110 — 6,119 50 — Mortgage loan forward sale commitments 403 — — 4,565 10 — Mortgage loan held for sale floating commitments 14,111 — — 11,800 — — Foreign exchange contracts 44,825 1,070 1,030 41,688 635 623 Total derivatives not designated as hedging instruments 1,282,354 6,303 6,153 1,318,759 3,958 3,886 Total derivatives $ 2,314,354 $ 6,303 $ 38,634 $ 2,350,759 $ 3,958 $ 25,280
Schedule of Gain (Loss) in Consolidated Statements of Income Related to Derivative Instruments	Gain (loss) included in the consolidated statements of income related to derivative instruments for the three months ended March 31, 2018 and 2017 were as follows: For the Three Months Ended March 31, 2018 2017 (In thousands) OCI Reclassified from AOCI to interest income Noninterest income OCI Reclassified from AOCI to interest income Noninterest income Derivatives designated as hedging instruments (cash flow hedges): Commercial loan interest rate swaps $ (11,278 ) $ (333 ) $ — $ (1,590 ) $ 1,867 $ — Derivatives not designated as hedging instruments: Mortgage loan held for sale interest rate lock commitments $ — $ — $ 61 $ — $ — $ 178 Foreign exchange contracts — — 508 — — 470
Schedule of Interest Rate Swap Agreements	In June 2015 and March 2016, the Company entered into the following interest rate swap agreements to manage overall cash flow changes related to interest rate risk exposure on benchmark interest rate loans. Effective Date Maturity Date Notional Amount (In Thousands) Fixed Rate Variable Rate June 15, 2015 December 17, 2018 $ 382,000 1.3250 % 1 Month LIBOR June 30, 2015 December 31, 2019 300,000 1.5120 1 Month LIBOR March 8, 2016 February 27, 2026 175,000 1.5995 1 Month LIBOR March 8, 2016 February 27, 2026 175,000 1.5890 1 Month LIBOR

Borrowed Funds (Tables)

Borrowed Funds (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Summary of Securities Sold Under Agreements to Repurchase	Information concerning the Company’s securities sold under agreements to repurchase as of March 31, 2018 and December 31, 2017 is summarized as follows: (In thousands) March 31, 2018 December 31, 2017 Balance at period end $ 1,298 $ 1,026 Average balance during the period 1,165 3,371 Average interest rate during the period 0.25 % 0.25 % Maximum month-end balance during the period $ 1,298 $ 6,286
Summary of Debt	Details of the debt transactions are as follows: (In thousands) March 31, 2018 December 31, 2017 Cadence Bancorporation: 4.875% senior notes, due June 28, 2019 $ 145,000 $ 145,000 5.375% senior notes, due June 28, 2021 50,000 50,000 7.250% subordinated notes, due June 28, 2029, callable in 2024 35,000 35,000 6.500% subordinated notes, due March 2025, callable in 2020 40,000 40,000 Total long-term debt—Cadence Bancorporation 270,000 270,000 Cadence Bank: 6.250% subordinated notes, due June 28, 2029, callable in 2024 25,000 25,000 Debt issuance cost and unamortized premium (1,476 ) (1,606 ) Purchased 4.875% senior notes, due June 28, 2019 (10,078 ) (10,078 ) Total long-term debt $ 283,446 $ 283,316
Summary of Junior Subordinated Debt	The following is a list of junior subordinated debt: (In thousands) March 31, 2018 December 31, 2017 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 (14,028 ) (14,147 ) Total junior subordinated debentures $ 36,591 $ 36,472

Other Noninterest Income and 37

Other Noninterest Income and Other Noninterest Expense (Tables)	3 Months Ended
	Mar. 31, 2018
Other Nonoperating Income Expense [Abstract]
Summary of Other Noninterest Income and Other Noninterest Expense	The detail of the other noninterest income and other noninterest expense captions presented in the consolidated statements of income is as follows: Three Months Ended March 31, (In thousands) 2018 2017 Other noninterest income Insurance revenue $ 2,259 $ 2,130 Bankcard fees 1,884 1,812 Income from bank owned life insurance policies 935 1,059 Other 132 476 Total other noninterest income $ 5,210 $ 5,477 Three Months Ended March 31, (In thousands) 2018 2017 Other noninterest expenses Net cost of operation of other real estate owned $ (52 ) $ 296 Data processing expense 2,365 1,696 Consulting and professional fees 2,934 1,139 Loan related expenses 255 280 FDIC Insurance 955 1,493 Communications 704 655 Advertising and public relations 341 345 Legal expenses 2,627 471 Other 6,074 5,745 Total other noninterest expenses $ 16,203 $ 12,120

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Net Income Per Common Share	The following table displays a reconciliation of the information used in calculating basic and diluted net income per common share for the three months ended March 31, 2018 and 2017. Three Months Ended March 31, (In thousands, except per share data) 2018 2017 Net income $ 38,825 $ 26,117 Weighted average common shares outstanding (Basic) 83,625,000 75,000,000 Weighted average restricted stock units 1,049,807 672,750 Weighted average common shares outstanding (Diluted) 84,674,807 75,672,750 Earnings per common share (Basic) $ 0.46 $ 0.35 Earnings per common share (Diluted) $ 0.46 $ 0.35

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2018
Banking And Thrift [Abstract]
Schedule of Actual Capital Amounts and Ratios	The actual capital amounts and ratios for the Company and the bank as of March 31, 2018 and December 31, 2017 are presented in the following table and as shown, are above the thresholds necessary to be considered “well-capitalized”. Management believes there are no conditions or events that would change that classification in the foreseeable future. Consolidated Company Bank (In thousands) Amount Ratio Amount Ratio March 31, 2018 Tier 1 leverage $ 1,120,451 10.6 % $ 1,225,079 11.6 % Common equity tier 1 capital 1,081,809 10.4 1,175,079 11.3 Tier 1 risk-based capital 1,120,451 10.8 1,225,079 11.8 Total risk-based capital 1,311,834 12.6 1,342,433 12.9 The minimum amounts of capital and ratios established by banking regulators are as follows: Tier 1 leverage $ 423,950 4.0 % $ 423,855 4.0 % Common equity tier 1 capital 467,253 4.5 467,093 4.5 Tier 1 risk-based capital 623,004 6.0 622,790 6.0 Total risk-based capital 830,672 8.0 830,387 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A $ 529,818 5.0 % Common equity tier 1 capital N/A N/A 674,689 6.5 Tier 1 risk-based capital N/A N/A 830,387 8.0 Total risk-based capital N/A N/A 1,037,984 10.0 Consolidated Company Bank (In thousands) Amount Amount Amount Ratio December 31, 2017 Tier 1 leverage $ 1,096,438 10.7 % $ 1,198,234 11.7 % Common equity tier 1 (transitional) 1,058,888 10.6 1,149,181 11.5 Tier 1 risk-based capital 1,096,438 10.9 1,198,234 12.0 Total risk-based capital 1,283,561 12.8 1,311,376 13.1 The minimum amounts of capital and ratios established by banking regulators are as follows: Tier 1 leverage $ 410,770 4.0 % $ 410,743 4.0 % Common equity tier 1 (transitional) 450,951 4.5 450,874 4.5 Tier 1 risk-based capital 601,269 6.0 601,165 6.0 Total risk-based capital 801,691 8.0 801,553 8.0 Well capitalized requirement: Tier 1 leverage N/A N/A $ 513,429 5.0 % Common equity tier 1 (transitional) N/A N/A 651,262 6.5 Tier 1 risk-based capital N/A N/A 801,553 8.0 Total risk-based capital N/A N/A 1,001,941 10.0

Commitments and Contingent Li40

Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Summary of Commitments and Contingent Liabilities	A summary of commitments and contingent liabilities at March 31, 2018 is as follows: (In thousands) March 31, 2018 Commitments to extend credit $ 3,413,043 Commitments to grant loans 238,624 Standby letters of credit 98,701 Performance letters of credit 29,178 Commercial letters of credit 2,926

Supplemental Cash Flow Inform41

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	For the Three Months Ended March 31, (In thousands) 2018 2017 Cash paid during the year for: Interest $ 19,217 $ 12,776 Income taxes, net of refunds (82 ) (219 ) Non-cash investing activities (at fair value): Transfers of loans to other real estate $ 1,548 $ 3,489 Transfers of commercial loans to loans held for sale 3,500 39,249

Disclosure About Fair Values 42

Disclosure About Fair Values of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 and December 31, 2017: (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) March 31, 2018 Investment securities available-for-sale: U.S. Treasury securities $ 95,930 $ — $ 95,930 $ — Obligations of U.S. government agencies 99,835 — 99,835 — Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 97,542 — 97,542 — Issued by FNMA and FHLMC 433,085 — 433,085 — Other residential mortgage-backed securities 42,821 — 42,821 — Commercial mortgage-backed securities 70,736 — 70,736 — Total MBS 644,184 — 644,184 — Obligations of states and municipal subdivisions 406,057 — 406,057 — Total investment securities available-for-sale 1,246,006 — 1,246,006 — Equity securities with readily determinable fair values not held for trading 5,829 5,829 — — Derivative assets 6,303 — 6,303 — Net profits interests 14,295 — — 14,295 Investments in limited partnerships 7,514 — — 7,514 Total recurring basis measured assets $ 1,279,947 $ 5,829 $ 1,252,309 $ 21,809 Derivative liabilities $ 38,634 $ — $ 38,634 $ — Total recurring basis measured liabilities $ 38,634 $ — $ 38,634 $ — (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2017 Investment securities available-for-sale: U.S. Treasury securities $ 96,844 $ — $ 96,844 $ — Obligations of U.S. government agencies 81,224 — 81,224 — Mortgage-backed securities issued or guaranteed by U.S. agencies (MBS) Residential pass-through: Guaranteed by GNMA 106,027 — 106,027 — Issued by FNMA and FHLMC 430,422 — 430,422 — Other residential mortgage-backed securities 46,392 — 46,392 — Commercial mortgage-backed securities 72,195 — 72,195 — Total MBS 655,036 — 655,036 — Obligations of states and municipal subdivisions 423,959 — 423,959 — Total investment securities available-for-sale 1,257,063 — 1,257,063 — Equity securities with readily determinable fair values not held for trading 5,885 5,885 — — Derivative assets 3,985 — 3,985 — Net profits interests 15,833 — — 15,833 Total recurring basis measured assets $ 1,282,766 $ 5,885 $ 1,261,048 $ 15,833 Derivative liabilities $ 25,307 $ — $ 25,307 $ — Total recurring basis measured liabilities $ 25,307 $ — $ 25,307 $ —
Summary of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The tables below include a roll-forward of the condensed consolidated balance sheet amounts for the three months ended March 31, 2018 and 2017 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 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, 2018 2017 2018 2017 (In thousands) Net Profits Interests Investments in Limited Partnerships Beginning Balance $ 15,833 $ 19,425 $ — $ — Transfers in due to adoption of ASU 2016-01 — — 5,518 — Adjustment recorded in retained earnings due to adoption of ASU 2016-01 — — 1,201 — Net (losses) gains included in earnings (869 ) (2,645 ) 676 — Contributions paid — — 225 — Distributions received (669 ) (230 ) (106 ) — Balance at March 31 $ 14,295 $ 16,550 $ 7,514 $ — Net unrealized (losses) gains included in earnings relating to assets held at the end of the period $ (869 ) $ (2,645 ) $ 676 $ —
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, 2018 and December 31, 2017, 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, 2018 Loans held for sale $ 37,446 $ — $ 37,446 $ — Impaired loans, net of specific allowance 50,829 — — 50,829 Other real estate 6,642 — — 6,642 Total assets measured on a nonrecurring basis $ 94,917 $ — $ 37,446 $ 57,471 (In thousands) Carrying Value (Level 1) (Level 2) (Level 3) December 31, 2017 Loans held for sale $ 61,359 $ — $ 61,359 $ — Impaired loans, net of specific allowance 65,087 — — 65,087 Other real estate 7,605 — — 7,605 Total assets measured on a nonrecurring basis $ 134,051 $ — $ 61,359 $ 72,692
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 at March 31, 2018 and December 31, 2017 are summarized below: Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range March 31, 2018 Impaired loans, net of specific allowance $ 50,829 Appraised value, as adjusted Discount to fair value 0% - 50% Discounted cash flow Net recoverable oil and gas reserves and forward-looking commodity prices. Discount rate - 9% to 10% 0% - 7% (1) Discounted cash flow Discount rates - 3.1% to 6.8% 0% - 2% (1) Estimated closing costs 10% Other real estate 6,642 Appraised value, as adjusted Discount to fair value 0% - 20% Estimated closing costs 10% (1) - Represents fair value as a percent of the unpaid principal balance. Quantitative Information about Level 3 Fair Value Measurements (In thousands) Carrying Value Valuation Methods Unobservable Inputs Range December 31, 2017 Impaired loans, net of specific allowance $ 65,087 Appraised value, as adjusted Discount to fair value 0%-50% Discounted cash flow Net recoverable oil and gas reserves and forward-looking commodity prices. Discount rate - 9% 0% - 29% (1) Discounted cash flow Discount rates - 3.6% to 8.0% 0% - 1% (1) Estimated closing costs 10% Other real estate 7,605 Appraised value, as adjusted Discount of fair value 0%-20% Estimated closing costs 10% (1) - Represents fair value as a percent of the unpaid principal balance.
Summary of Estimated Fair Values of Financial Instruments	The estimated fair values of the Company’s financial instruments are as follows: As of March 31, 2018 Carrying (In thousands) Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 130,704 $ 130,704 $ 130,704 $ — $ — Interest-bearing deposits in other banks 281,297 281,297 281,297 — — Federal funds sold 4,695 4,695 4,695 — — Securities available-for-sale 1,246,005 1,246,005 — 1,246,005 — Equity securities with readily determinable fair values not held for trading 5,829 5,829 5,829 — — Loans held for sale 37,446 37,446 — 37,446 — Net loans 8,555,450 8,437,656 — — 8,437,656 Derivative assets 6,303 6,303 — 6,303 — Net profits interests 14,295 14,295 — — 14,295 Investments in limited partnerships 7,514 7,514 — — 7,514 Financial Liabilities: Deposits 9,048,971 9,045,299 — 9,045,299 — Advances from FHLB 150,000 150,000 — 150,000 — Securities sold under agreements to repurchase 1,298 1,298 — 1,298 — Senior debt 184,700 193,529 — 193,529 — Subordinated debt 98,746 98,101 — 98,101 — Junior subordinated debentures 36,591 49,019 — 49,019 — Derivative liabilities 38,634 38,634 — 38,634 — As of December 31, 2017 (In thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Financial Assets: Cash and due from banks $ 238,707 $ 238,707 $ 238,707 $ — $ — Interest-bearing deposits in other banks 482,568 482,568 482,568 — — Federal funds sold 9,536 9,536 9,536 — — Securities available-for-sale 1,257,063 1,257,063 — 1,257,063 — Securities held-to-maturity 290 311 — 311 — Equity securities with readily determinable fair values not held for trading 5,885 5,885 5,885 — — Loans held for sale 61,359 61,359 — 61,359 — Net loans 8,165,851 8,134,903 — — 8,134,903 Derivative assets 3,985 3,985 — 3,985 — Net profits interests 15,833 15,833 — — 15,833 Financial Liabilities: Deposits 9,011,515 9,006,890 — 9,006,890 — Advances from FHLB 150,000 150,000 — 150,000 — Securities sold under agreements to repurchase 1,026 1,026 — 1,026 — Senior debt 184,629 194,484 — 194,484 — Subordinated debt 98,687 94,724 — 94,724 — Junior subordinated debentures 36,472 49,161 — 49,161 — Derivative liabilities 25,307 25,307 — 25,307 —

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 and 2017: For the Three Months Ended March 31, 2018 (In thousands) Banking Financial Services Corporate Consolidated Net interest income $ 96,100 $ (607 ) $ (4,382 ) $ 91,111 Provision for credit losses 4,380 — — 4,380 Noninterest income 12,438 12,358 187 24,983 Noninterest expense 50,532 9,977 1,430 61,939 Income tax expense (benefit) 12,446 308 (1,804 ) 10,950 Net income (loss) $ 41,180 $ 1,466 $ (3,821 ) $ 38,825 Total assets $ 10,903,031 $ 91,468 $ 4,883 $ 10,999,382 For the Three Months Ended March 31, 2017 (In thousands) Banking Financial Services Corporate Consolidated Net interest income $ 79,103 $ 784 $ (5,129 ) $ 74,758 Provision for credit losses 5,786 — — 5,786 Noninterest income 11,700 12,321 84 24,105 Noninterest expense 45,457 8,681 183 54,321 Income tax expense (benefit) 13,846 1,548 (2,755 ) 12,639 Net income (loss) $ 25,714 $ 2,876 $ (2,473 ) $ 26,117 Total assets $ 9,629,061 $ 88,644 $ 3,232 $ 9,720,937

Accumulated Other Comprehensi44

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	Activity within the balances in accumulated other comprehensive loss is shown in the following tables for the three months ended March 31, 2018. ` Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on defined benefit pension plans Unrealized gains (losses) on derivative instruments designated as cash flow hedges Accumulated other comprehensive gain (loss) Balance, December 31, 2017 $ (2,160 ) $ (531 ) $ (16,342 ) $ (19,033 ) Net change (23,401 ) — (8,377 ) (31,778 ) Balance, March 31, 2018 $ (25,561 ) $ (531 ) $ (24,719 ) $ (50,811 )

Variable Interest Entities an45

Variable Interest Entities and Other Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Variable Interest Entities And Other Investments [Abstract]
Summary of Investment in Limited Partnerships Subsequent to Adoption of ASU 2016-01	The following table presents a summary of the Company’s investments in limited partnerships subsequent to the adoption of ASU 2016-01 and as of March 31, 2018: (In thousands) As of March 31, 2018 Affordable housing projects (amortized cost) $ 7,479 Limited partnerships accounted for under the fair value practical expedient of NAV 7,514 Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method 8,692 Limited partnerships required to be accounted for under the equity method 8,797 Total investments in limited partnerships $ 32,482

Summary of Accounting Policie46

Summary of Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2018
ASU 2016-01
Significant Of Accounting Policies [Line Items]
Adjustment to retained earnings	$ 1,000	$ 95

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Estimated Fair Value of Securities Excluding Equity Securities With Readily Determinable Fair Values Not Held For Trading (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	$ 1,281,939	$ 1,262,688
Securities available-for-sale, Gross Unrealized Gains	3,378	10,397
Securities available-for-sale, Gross Unrealized Losses	39,312	16,022
Securities available-for-sale, Estimated Fair Value	1,246,005	1,257,063
Securities held-to-maturity, Amortized Cost		290
Securities held-to-maturity, Estimated Fair Value		311
U.S. Treasury Securities
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	100,535	100,575
Securities available-for-sale, Gross Unrealized Losses	4,605	3,731
Securities available-for-sale, Estimated Fair Value	95,930	96,844
Obligations of U.S. Government Agencies
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	99,807	80,552
Securities available-for-sale, Gross Unrealized Gains	367	738
Securities available-for-sale, Gross Unrealized Losses	339	66
Securities available-for-sale, Estimated Fair Value	99,835	81,224
Residential Pass-through | Guaranteed by GNMA
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	99,529	106,461
Securities available-for-sale, Gross Unrealized Gains	261	676
Securities available-for-sale, Gross Unrealized Losses	2,248	1,110
Securities available-for-sale, Estimated Fair Value	97,542	106,027
Residential Pass-through | Issued by FNMA and FHLMC
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	442,887	431,409
Securities available-for-sale, Gross Unrealized Gains	711	1,284
Securities available-for-sale, Gross Unrealized Losses	10,513	2,271
Securities available-for-sale, Estimated Fair Value	433,085	430,422
Other Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	44,269	47,379
Securities available-for-sale, Gross Unrealized Gains	20	97
Securities available-for-sale, Gross Unrealized Losses	1,468	1,084
Securities available-for-sale, Estimated Fair Value	42,821	46,392
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	75,666	76,201
Securities available-for-sale, Gross Unrealized Gains		63
Securities available-for-sale, Gross Unrealized Losses	4,930	4,069
Securities available-for-sale, Estimated Fair Value	70,736	72,195
Total MBS
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	662,351	661,450
Securities available-for-sale, Gross Unrealized Gains	992	2,120
Securities available-for-sale, Gross Unrealized Losses	19,159	8,534
Securities available-for-sale, Estimated Fair Value	644,184	655,036
Obligations of States and Municipal Subdivisions
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Securities available-for-sale, Amortized Cost	419,246	420,111
Securities available-for-sale, Gross Unrealized Gains	2,019	7,539
Securities available-for-sale, Gross Unrealized Losses	15,209	3,691
Securities available-for-sale, Estimated Fair Value	$ 406,056	423,959
Securities held-to-maturity, Amortized Cost		290
Securities held-to-maturity, Gross Unrealized Gains		21
Securities held-to-maturity, Estimated Fair Value		$ 311

Securities - Additional Informa

Securities - Additional Information (Details)	Jan. 01, 2018USD ($)	Mar. 31, 2018USD ($)Security	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)Security
Schedule Of Available For Sale Securities [Line Items]
Number of held to maturity securities | Security				1
Held to maturity securities transferred to available for sale securities | Security		1
Other-than-temporary impairment charges | $		$ 0	$ 0
Carrying value of securities pledged | $		533,100,000		$ 507,300,000
Securities, held-to-maturity with unrealized losses | $		$ 0		$ 0
Percentage of fair value of securities in investment portfolio reflect unrealized loss		84.00%		58.00%
Number of securities in a loss position for more than twelve months | Security		89
Number of securities in a loss position for less than twelve months | Security		138
ASU 2016-01
Schedule Of Available For Sale Securities [Line Items]
Adjustment to retained earnings | $	$ 1,000,000	$ 95,000

Securities - Schedule of Contra

Securities - Schedule of Contractual Maturities of Securities Available-for-Sale and Securities Held-to-Maturity (Details) $ in Thousands	Mar. 31, 2018USD ($)
Investments Debt And Equity Securities [Abstract]
Available-for-Sale, Due after one year through five years, Amortized Cost	$ 109,319
Available-for-Sale, Due after five years through ten years, Amortized Cost	15,984
Available-for-Sale, Due after ten years, Amortized Cost	494,285
Available-for-Sale, Mortgage-backed securities, Amortized Cost	662,351
Available-for-Sale, Total, Amortized Cost	1,281,939
Available-for-Sale, Due after one year through five years, Estimated Fair Value	104,751
Available-for-Sale, Due after five years through ten years, Estimated Fair Value	15,994
Available-for-Sale, Due after ten years, Estimated Fair Value	481,076
Available-for-Sale, Mortgage-backed securities, Estimated Fair Value	644,184
Available-for-Sale, Total, Estimated Fair Value	$ 1,246,005

Securities - Summary of Gross G

Securities - Summary of Gross Gains, and Gross Losses on Sales of Securities Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments Debt And Equity Securities [Abstract]
Gross realized gains	$ 12	$ 81
Realized gains on sale of securities available for sale, net	$ 12	$ 81

Securities - Schedule of Securi

Securities - Schedule of Securities Classified as Available-for-Sale with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	$ 633,660	$ 310,452
Losses less than 12 Months, Gross Unrealized Losses	13,159	1,521
Losses more than 12 Months, Estimated Fair Value	409,308	418,361
Losses more than 12 Months, Gross Unrealized Losses	26,153	14,501
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Losses more than 12 Months, Estimated Fair Value	95,930	96,844
Losses more than 12 Months, Gross Unrealized Losses	4,605	3,731
Obligations of U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	58,217	1,577
Losses less than 12 Months, Gross Unrealized Losses	245	9
Losses more than 12 Months, Estimated Fair Value	11,531	14,323
Losses more than 12 Months, Gross Unrealized Losses	94	57
MBS
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	403,703	306,274
Losses less than 12 Months, Gross Unrealized Losses	9,022	1,490
Losses more than 12 Months, Estimated Fair Value	174,381	172,324
Losses more than 12 Months, Gross Unrealized Losses	10,137	7,044
Obligations of States and Municipal Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Losses less than 12 Months, Estimated Fair Value	171,740	2,601
Losses less than 12 Months, Gross Unrealized Losses	3,892	22
Losses more than 12 Months, Estimated Fair Value	127,466	134,870
Losses more than 12 Months, Gross Unrealized Losses	$ 11,317	$ 3,669

Loans and Allowance for Credi52

Loans and Allowance for Credit Losses - Total Loans Outstanding by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 8,677,400	$ 8,279,778	$ 7,585,042
Unearned discount and fees	(30,413)	(26,351)
Total (Net of unearned discount and fees)	8,646,987	8,253,427
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	5,500,775	5,133,786	4,713,481
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	3,005,397	2,746,454
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	984,200	935,371
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,078,904	1,035,538
Commercial and Industrial | Healthcare
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	432,274	416,423
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,156,410	1,158,401	1,095,343
Commercial Real Estate | Income Producing
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,076,067	1,082,929
Commercial Real Estate | Land and Development
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	80,343	75,472
Consumer
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,784,878	1,765,736	1,571,650
Consumer | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,721,819	1,690,814
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	63,059	74,922
Small Business Lending
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 235,337	$ 221,855	$ 204,568

Loans and Allowance for Credi53

Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	$ 87,576	$ 82,268
Provision for loan losses	4,380	5,786
Charge-offs	(812)	(551)
Recoveries	393	801
Balance at end of period	91,537	88,304
Loans ending balance	8,677,400	7,585,042	$ 8,279,778
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	55,919	54,688
Provision for loan losses	5,330	5,097
Charge-offs	(58)	(310)
Recoveries	18	532
Balance at end of period	61,209	60,007
Loans ending balance	5,500,775	4,713,481	5,133,786
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	11,990	10,103
Provision for loan losses	(513)	438
Recoveries	209	14
Balance at end of period	11,686	10,555
Loans ending balance	1,156,410	1,095,343	1,158,401
Consumer
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	14,983	13,265
Provision for loan losses	(903)	211
Charge-offs	(301)	(241)
Recoveries	103	63
Balance at end of period	13,882	13,298
Loans ending balance	1,784,878	1,571,650	1,765,736
Small Business Lending
Accounts Notes And Loans Receivable [Line Items]
Balance at beginning of period	4,684	4,212
Provision for loan losses	466	40
Charge-offs	(453)
Recoveries	63	192
Balance at end of period	4,760	4,444
Loans ending balance	235,337	204,568	221,855
ACI Loans
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses, collectively evaluated for impairment	82,596	77,984
Allowance for credit losses, individually evaluated for impairment	8,941	10,320
Loans collectively evaluated for impairment	8,599,852	7,403,743
Loans individually evaluated for impairment	77,548	181,299
Loans ending balance	249,490		260,560
ACI Loans | Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses, collectively evaluated for impairment	52,535	50,006
Allowance for credit losses, individually evaluated for impairment	8,674	10,001
Loans collectively evaluated for impairment	5,433,850	4,545,395
Loans individually evaluated for impairment	66,925	168,086
Loans ending balance	28,653		29,577
ACI Loans | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses, collectively evaluated for impairment	11,684	10,550
Allowance for credit losses, individually evaluated for impairment	2	5
Loans collectively evaluated for impairment	1,148,486	1,084,936
Loans individually evaluated for impairment	7,924	10,407
Loans ending balance	77,554		79,861
ACI Loans | Consumer
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses, collectively evaluated for impairment	13,639	13,031
Allowance for credit losses, individually evaluated for impairment	243	267
Loans collectively evaluated for impairment	1,782,604	1,569,763
Loans individually evaluated for impairment	2,274	1,887
Loans ending balance	143,283		$ 151,122
ACI Loans | Small Business Lending
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses, collectively evaluated for impairment	4,738	4,397
Allowance for credit losses, individually evaluated for impairment	22	47
Loans collectively evaluated for impairment	234,912	203,649
Loans individually evaluated for impairment	$ 425	$ 919

Loans and Allowance for Credi54

Loans and Allowance for Credit Losses - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)TDR	Mar. 31, 2017USD ($)TDR	Dec. 31, 2017USD ($)
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 37,446		$ 61,359
Interest income recognized for impaired loans	239	$ 403
Contractual interest recognized on cash basis	$ 300	$ 200
Number of TDRs experiencing payment default | TDR	0	0
ACI Loans
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs experiencing payment default | TDR	0	0
Number of TDRs | TDR	0	1
Recorded Investment		$ 954
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Foreclosed residential properties	$ 2,800		2,700
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Number of TDRs | TDR	0	1
Recorded Investment		$ 196
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 34,900
Mortgage Loans
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	2,500
Consumer Loans | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Residential mortgage loans in process of foreclosure	$ 2,200		$ 4,400

Loans and Allowance for Credi55

Loans and Allowance for Credit Losses - Summary of Impaired Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	$ 10,499	$ 21,590
Unpaid Principal Balance, With no related allowance for credit losses		13,160	30,508
Nonaccrual Loans Included in Impaired Loans, with no related allowance for credit losses		9,173	15,298
Undisbursed Commitments, With no related allowance for credit losses		5	387
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	49,060	52,020
Unpaid Principal Balance, With allowance for credit losses recorded		57,050	55,800
Related Specific Allowance, With allowance for credit losses recorded		8,731	8,522
Nonaccrual Loans Included in Impaired Loans, With allowance for credit losses recorded		32,816	28,060
Undisbursed Commitments, With allowance for credit losses recorded		4,310	2,902
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	8,900	19,832
Unpaid Principal Balance, With no related allowance for credit losses		11,101	28,301
Nonaccrual Loans Included in Impaired Loans, with no related allowance for credit losses		8,900	15,014
Undisbursed Commitments, With no related allowance for credit losses		5	387
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	48,277	50,874
Unpaid Principal Balance, With allowance for credit losses recorded		55,993	54,385
Related Specific Allowance, With allowance for credit losses recorded		8,674	8,459
Nonaccrual Loans Included in Impaired Loans, With allowance for credit losses recorded		32,761	28,000
Undisbursed Commitments, With allowance for credit losses recorded		4,310	2,902
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	189	5,010
Unpaid Principal Balance, With no related allowance for credit losses		197	4,994
Nonaccrual Loans Included in Impaired Loans, with no related allowance for credit losses		189	192
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	4,759
Unpaid Principal Balance, With allowance for credit losses recorded		4,737
Related Specific Allowance, With allowance for credit losses recorded		3
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	8,711	14,822
Unpaid Principal Balance, With no related allowance for credit losses		10,903	23,307
Nonaccrual Loans Included in Impaired Loans, with no related allowance for credit losses		8,711	14,822
Undisbursed Commitments, With no related allowance for credit losses		5	387
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	32,549	39,857
Unpaid Principal Balance, With allowance for credit losses recorded		40,287	43,416
Related Specific Allowance, With allowance for credit losses recorded		7,202	8,353
Nonaccrual Loans Included in Impaired Loans, With allowance for credit losses recorded		21,791	28,000
Undisbursed Commitments, With allowance for credit losses recorded		1,810	402
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	10,969	11,017
Unpaid Principal Balance, With allowance for credit losses recorded		10,969	10,969
Related Specific Allowance, With allowance for credit losses recorded		1,469	106
Nonaccrual Loans Included in Impaired Loans, With allowance for credit losses recorded		10,969
Undisbursed Commitments, With allowance for credit losses recorded		2,500	2,500
Consumer
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	1,360	1,509
Unpaid Principal Balance, With no related allowance for credit losses		1,364	1,512
Nonaccrual Loans Included in Impaired Loans, with no related allowance for credit losses		34	35
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	597
Unpaid Principal Balance, With allowance for credit losses recorded		594
Related Specific Allowance, With allowance for credit losses recorded		35
Consumer | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	1,083	1,093
Unpaid Principal Balance, With no related allowance for credit losses		1,088	1,097
Nonaccrual Loans Included in Impaired Loans, with no related allowance for credit losses		34	35
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	494	496
Unpaid Principal Balance, With allowance for credit losses recorded		491	494
Related Specific Allowance, With allowance for credit losses recorded		35	36
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	277	416
Unpaid Principal Balance, With no related allowance for credit losses		276	415
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	103
Unpaid Principal Balance, With allowance for credit losses recorded		103
Small Business Lending
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment in Impaired Loans, With no related allowance for credit losses	[1]	239	249
Unpaid Principal Balance, With no related allowance for credit losses		695	695
Nonaccrual Loans Included in Impaired Loans, with no related allowance for credit losses		239	249
Recorded Investment in Impaired Loans, With allowance for credit losses recorded	[1]	186	650
Unpaid Principal Balance, With allowance for credit losses recorded		463	921
Related Specific Allowance, With allowance for credit losses recorded		22	27
Nonaccrual Loans Included in Impaired Loans, With allowance for credit losses recorded		$ 55	$ 60
[1]	The recorded investment of a loan also includes any interest receivable, net unearned discount or fees, and unamortized premium or discount.

Loans and Allowance for Credi56

Loans and Allowance for Credit Losses - Summary of Average Recorded Investment in Impaired Originated and ANCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	$ 66,584	$ 141,307
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	63,941	138,825
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	4,979	12,455
Commercial and Industrial | Energy Sector
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	47,969	126,370
Commercial and Industrial | Restaurant Industry
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	10,993
Consumer
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	1,981	1,552
Consumer | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	1,583	1,164
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	398	388
Small Business Lending
Accounts Notes And Loans Receivable [Line Items]
Average recorded investment	$ 662	$ 930

Loans and Allowance for Credi57

Loans and Allowance for Credit Losses - Summary of Credit Exposure by Portfolio Segment and Class of Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]
Recorded investment	$ 293,349	$ 278,587
Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Recorded investment	269,954	252,600
Commercial and Industrial | General C&I
Financing Receivable Recorded Investment [Line Items]
Recorded investment	135,924	127,874
Commercial and Industrial | Energy Sector
Financing Receivable Recorded Investment [Line Items]
Recorded investment	80,965	107,613
Commercial and Industrial | Restaurant Industry
Financing Receivable Recorded Investment [Line Items]
Recorded investment	52,997	17,042
Commercial and Industrial | Healthcare
Financing Receivable Recorded Investment [Line Items]
Recorded investment	68	71
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Recorded investment	19	46
Commercial Real Estate | Land and Development
Financing Receivable Recorded Investment [Line Items]
Recorded investment	19	20
Commercial Real Estate | Income Producing
Financing Receivable Recorded Investment [Line Items]
Recorded investment		26
Consumer
Financing Receivable Recorded Investment [Line Items]
Recorded investment	19,478	21,059
Consumer | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Recorded investment	18,462	20,026
Consumer | Other
Financing Receivable Recorded Investment [Line Items]
Recorded investment	1,016	1,033
Small Business Lending
Financing Receivable Recorded Investment [Line Items]
Recorded investment	3,898	4,882
Special Mention
Financing Receivable Recorded Investment [Line Items]
Recorded investment	157,367	96,869
Special Mention | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	6,336	6,930
Special Mention | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Recorded investment	147,148	85,086
Special Mention | Commercial and Industrial | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	700	737
Special Mention | Commercial and Industrial | General C&I
Financing Receivable Recorded Investment [Line Items]
Recorded investment	93,231	80,550
Special Mention | Commercial and Industrial | General C&I | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	700	737
Special Mention | Commercial and Industrial | Energy Sector
Financing Receivable Recorded Investment [Line Items]
Recorded investment	11,889
Special Mention | Commercial and Industrial | Restaurant Industry
Financing Receivable Recorded Investment [Line Items]
Recorded investment	42,028	4,536
Special Mention | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Recorded investment	19	20
Special Mention | Commercial Real Estate | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	1,708	2,179
Special Mention | Commercial Real Estate | Land and Development
Financing Receivable Recorded Investment [Line Items]
Recorded investment	19	20
Special Mention | Commercial Real Estate | Income Producing | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	1,708	2,179
Special Mention | Consumer
Financing Receivable Recorded Investment [Line Items]
Recorded investment	8,204	8,283
Special Mention | Consumer | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	3,928	4,014
Special Mention | Consumer | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Recorded investment	7,529	7,610
Special Mention | Consumer | Residential Real Estate | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	3,824	3,900
Special Mention | Consumer | Other
Financing Receivable Recorded Investment [Line Items]
Recorded investment	675	673
Special Mention | Consumer | Other | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	104	114
Special Mention | Small Business Lending
Financing Receivable Recorded Investment [Line Items]
Recorded investment	1,996	3,480
Substandard
Financing Receivable Recorded Investment [Line Items]
Recorded investment	129,186	174,053
Substandard | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	33,680	36,888
Substandard | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Recorded investment	116,039	159,880
Substandard | Commercial and Industrial | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	7,183	7,321
Substandard | Commercial and Industrial | General C&I
Financing Receivable Recorded Investment [Line Items]
Recorded investment	42,693	47,324
Substandard | Commercial and Industrial | General C&I | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	1,150	1,173
Substandard | Commercial and Industrial | Energy Sector
Financing Receivable Recorded Investment [Line Items]
Recorded investment	62,309	99,979
Substandard | Commercial and Industrial | Restaurant Industry
Financing Receivable Recorded Investment [Line Items]
Recorded investment	10,969	12,506
Substandard | Commercial and Industrial | Healthcare
Financing Receivable Recorded Investment [Line Items]
Recorded investment	68	71
Substandard | Commercial and Industrial | Healthcare | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	6,033	6,148
Substandard | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Recorded investment		26
Substandard | Commercial Real Estate | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	5,642	6,515
Substandard | Commercial Real Estate | Income Producing
Financing Receivable Recorded Investment [Line Items]
Recorded investment		26
Substandard | Commercial Real Estate | Income Producing | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	5,642	6,515
Substandard | Consumer
Financing Receivable Recorded Investment [Line Items]
Recorded investment	11,270	12,772
Substandard | Consumer | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	20,855	23,052
Substandard | Consumer | Residential Real Estate
Financing Receivable Recorded Investment [Line Items]
Recorded investment	10,933	12,416
Substandard | Consumer | Residential Real Estate | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	20,531	22,635
Substandard | Consumer | Other
Financing Receivable Recorded Investment [Line Items]
Recorded investment	337	356
Substandard | Consumer | Other | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	324	417
Substandard | Small Business Lending
Financing Receivable Recorded Investment [Line Items]
Recorded investment	1,877	1,375
Doubtful
Financing Receivable Recorded Investment [Line Items]
Recorded investment	6,796	7,665
Doubtful | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	38	37
Doubtful | Commercial and Industrial
Financing Receivable Recorded Investment [Line Items]
Recorded investment	6,767	7,634
Doubtful | Commercial and Industrial | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	38	37
Doubtful | Commercial and Industrial | General C&I | ACI Loans
Financing Receivable Recorded Investment [Line Items]
Recorded investment	38	37
Doubtful | Commercial and Industrial | Energy Sector
Financing Receivable Recorded Investment [Line Items]
Recorded investment	6,767	7,634
Doubtful | Consumer
Financing Receivable Recorded Investment [Line Items]
Recorded investment	4	4
Doubtful | Consumer | Other
Financing Receivable Recorded Investment [Line Items]
Recorded investment	4	4
Doubtful | Small Business Lending
Financing Receivable Recorded Investment [Line Items]
Recorded investment	$ 25	$ 27

Loans and Allowance for Credi58

Loans and Allowance for Credit Losses - Summary of Aging of Past Due Originated and ANCI Loans by Portfolio Segment and Class of Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	$ 4,463	$ 4,768
Accruing Loans | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	639	1,361
Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	333	827
Non-Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	480	474
Non-Accruing Loans | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	483	293
Non-Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	7,133	13,206
Non-Accruing Loans | 0-29 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	44,120	33,495
Non-Accruing Loans | Restaurant Industry | 0-29 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	10,969
Commercial Real Estate | Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	2	55
Commercial Real Estate | Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	53	26
Commercial Real Estate | Income Producing | Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	2
Commercial Real Estate | Income Producing | Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		26
Commercial Real Estate | Land and Development | Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		55
Commercial Real Estate | Land and Development | Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	53
Commercial and Industrial | Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	63	59
Commercial and Industrial | Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		476
Commercial and Industrial | Accruing Loans | General C&I | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	63	59
Commercial and Industrial | Accruing Loans | General C&I | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		476
Commercial and Industrial | Non-Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		263
Commercial and Industrial | Non-Accruing Loans | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	189
Commercial and Industrial | Non-Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	5,701	10,507
Commercial and Industrial | Non-Accruing Loans | 0-29 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	42,605	32,315
Commercial and Industrial | Non-Accruing Loans | General C&I | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		192
Commercial and Industrial | Non-Accruing Loans | General C&I | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	189
Commercial and Industrial | Non-Accruing Loans | Healthcare | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due		71
Commercial and Industrial | Non-Accruing Loans | Healthcare | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	68
Commercial and Industrial | Non-Accruing Loans | Energy Sector | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	5,633	10,507
Commercial and Industrial | Non-Accruing Loans | Energy Sector | 0-29 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	31,636	32,315
Consumer | Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	4,230	3,723
Consumer | Accruing Loans | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	610	1,033
Consumer | Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	280	325
Consumer | Accruing Loans | Residential Real Estate | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	3,756	3,191
Consumer | Accruing Loans | Residential Real Estate | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	542	1,030
Consumer | Accruing Loans | Residential Real Estate | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	280	325
Consumer | Accruing Loans | Other | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	474	532
Consumer | Accruing Loans | Other | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	68	3
Consumer | Non-Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	445	173
Consumer | Non-Accruing Loans | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	258	293
Consumer | Non-Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,276	2,205
Consumer | Non-Accruing Loans | 0-29 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,172	1,070
Consumer | Non-Accruing Loans | Residential Real Estate | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	445	173
Consumer | Non-Accruing Loans | Residential Real Estate | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	258	293
Consumer | Non-Accruing Loans | Residential Real Estate | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,276	2,205
Consumer | Non-Accruing Loans | Residential Real Estate | 0-29 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	1,172	1,070
Small Business Lending | Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	168	931
Small Business Lending | Accruing Loans | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	29	328
Small Business Lending | Non-Accruing Loans | 30-59 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	35	38
Small Business Lending | Non-Accruing Loans | 60-89 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	36
Small Business Lending | Non-Accruing Loans | 90+DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	156	494
Small Business Lending | Non-Accruing Loans | 0-29 DPD
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Past Due	$ 343	$ 110

Loans and Allowance for Credi59

Loans and Allowance for Credit Losses - Total Acquired Credit Impaired Loans Outstanding by Portfolio Segment and Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 8,677,400	$ 8,279,778	$ 7,585,042
ACI
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	249,490	260,560
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	5,500,775	5,133,786	4,713,481
Commercial and Industrial | ACI
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	28,653	29,577
Commercial and Industrial | General C&I
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	3,005,397	2,746,454
Commercial and Industrial | General C&I | ACI
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	22,620	23,428
Commercial and Industrial | Healthcare
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	432,274	416,423
Commercial and Industrial | Healthcare | ACI
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	6,033	6,149
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,156,410	1,158,401	1,095,343
Commercial Real Estate | ACI
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	77,554	79,861
Commercial Real Estate | Income Producing
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,076,067	1,082,929
Commercial Real Estate | Income Producing | ACI
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	77,554	79,861
Consumer
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,784,878	1,765,736	$ 1,571,650
Consumer | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	1,721,819	1,690,814
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	63,059	74,922
Consumer | ACI
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	143,283	151,122
Consumer | ACI | Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	142,293	149,942
Consumer | ACI | Other
Accounts Notes And Loans Receivable [Line Items]
Total loan outstanding and financing receivable	$ 990	$ 1,180

Loans and Allowance for Credi60

Loans and Allowance for Credit Losses - Summary of Changes in Accretable Discount for ACI Loans (Details) - ACI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable Recorded Investment [Line Items]
Balance at beginning of period	$ 78,422	$ 98,728
Maturities/payoff	(1,446)	(1,769)
Charge-offs	(13)	(79)
Foreclosure	(255)	(798)
Accretion	(5,192)	(6,331)
Reclass from nonaccretable difference due to increases in expected cash flow	4,558	3,364
Balance at end of period	$ 76,074	$ 93,115

Loans and Allowance for Credi61

Loans and Allowance for Credit Losses - Summary of Individually Impaired ACI Loans and Pooled ACI Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans		$ 293,349	$ 278,587
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans		19	46
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans		269,954	252,600
Consumer
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans		19,478	21,059
ACI Loans and Pooled ACI Loans
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans	[1]	123,821	115,000
Unpaid Principal Balance		167,185	152,024
Related Specific Allowance		8,362	8,524
Nonaccrual Loans Included in Impaired Loans			225
ACI Loans and Pooled ACI Loans | Commercial Real Estate
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans	[1]	87,135	82,856
Unpaid Principal Balance		122,460	112,330
Related Specific Allowance			2,010
Nonaccrual Loans Included in Impaired Loans			225
ACI Loans and Pooled ACI Loans | Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans	[1]	13,668	13,541
Unpaid Principal Balance		17,838	17,630
Related Specific Allowance		1,914	5
ACI Loans and Pooled ACI Loans | Consumer
Financing Receivable Impaired [Line Items]
Recorded Investment in Impaired Loans	[1]	23,018	18,603
Unpaid Principal Balance		26,887	22,064
Related Specific Allowance		$ 6,448	$ 6,509
[1]	The recorded investment of a loan also includes any interest receivable, net unearned discount or fees, and unamortized premium or discount.

Loans and Allowance for Credi62

Loans and Allowance for Credit Losses - Summary of Consumer Credit Exposure on ACI loans, Based on Past Due Status (Details) - ACI Loans - Consumer - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Residential Real Estate
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	$ 144,563	$ 152,336
Residential Real Estate | 0-29 DPD
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	133,543	139,662
Residential Real Estate | 30-59 DPD
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	3,216	2,299
Residential Real Estate | 60-89 DPD
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	1,898	2,496
Residential Real Estate | Financing Receivables 90 to 119 Days Past Due
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	798	399
Residential Real Estate | Financing Receivables 120 Days Past Due
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	5,108	7,480
Other
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	1,393	1,583
Other | 0-29 DPD
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	1,318	1,356
Other | 30-59 DPD
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	14	120
Other | 60-89 DPD
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due	$ 61	62
Other | Financing Receivables 120 Days Past Due
Accounts Notes And Loans Receivable [Line Items]
Loans Past Due		$ 45

Goodwill and Other Intangible63

Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 317,817	$ 317,817
Other intangible assets, net	9,430	10,223
Total goodwill and intangible assets	327,247	328,040
Core Deposit
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	1,193	1,595
Customer Lists
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	8,213	8,604
Trademarks
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	$ 24	$ 24

Goodwill and Other Intangible64

Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Core Deposit
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	$ 38,493	$ 38,091
Customer Lists
Goodwill And Other Intangible Assets [Line Items]
Accumulated amortization of intangible assets	$ 18,487	$ 18,097

Derivatives - Schedule of Notio

Derivatives - Schedule of Notional Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Notional Amount	$ 2,314,354	$ 2,350,759
Fair Value, Other Assets	6,303	3,958
Fair Value, Other Liabilities	38,634	25,280
Derivatives Designated as Hedging Instruments | Cash Flow Hedges | Commercial Loans | Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional Amount	1,032,000	1,032,000
Fair Value, Other Liabilities	32,481	21,394
Derivatives Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Notional Amount	1,282,354	1,318,759
Fair Value, Other Assets	6,303	3,958
Fair Value, Other Liabilities	6,153	3,886
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Interest Rate Lock Commitments
Derivatives Fair Value [Line Items]
Notional Amount	9,740	6,119
Fair Value, Other Assets	110	50
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Floating Commitments
Derivatives Fair Value [Line Items]
Notional Amount	14,111	11,800
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Notional Amount	44,825	41,688
Fair Value, Other Assets	1,070	635
Fair Value, Other Liabilities	1,030	623
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional Amount	701,111	737,533
Fair Value, Other Assets	2,390	2,056
Fair Value, Other Liabilities	2,390	2,056
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Caps
Derivatives Fair Value [Line Items]
Notional Amount	183,744	186,290
Fair Value, Other Assets	270	153
Fair Value, Other Liabilities	270	153
Derivatives Not Designated as Hedging Instruments | Commercial Loans | Interest Rate Floors
Derivatives Fair Value [Line Items]
Notional Amount	328,420	330,764
Fair Value, Other Assets	2,463	1,054
Fair Value, Other Liabilities	2,463	1,054
Derivatives Not Designated as Hedging Instruments | Forward Contracts | Mortgage Loan Forward Sale Commitments
Derivatives Fair Value [Line Items]
Notional Amount	$ 403	4,565
Fair Value, Other Assets		$ 10

Derivatives - Additional Inform

Derivatives - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Deferred net gains (loss) on derivatives	$ (7.8)
Cash Flow Hedges
Derivative [Line Items]
Maximum period for hedging transactions	8 years
Interest-bearing Deposits in Banks
Derivative [Line Items]
Cash or securities pledged as collateral	$ 27.6	$ 20.1

Derivatives - Schedule of Gain

Derivatives - Schedule of Gain (Loss) in Consolidated Statements of Income Related to Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Noninterest income	$ 7,800
Derivatives Designated as Hedging Instruments | Cash Flow Hedges | Commercial Loans | Interest Rate Swaps
Derivative Instruments Gain Loss [Line Items]
OCI	(11,278)	$ (1,590)
Reclassified from AOCI to interest income	(333)	1,867
Derivatives Not Designated as Hedging Instruments | Mortgage Loan Held for Sale Interest Rate Lock Commitments
Derivative Instruments Gain Loss [Line Items]
Noninterest income	61	178
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivative Instruments Gain Loss [Line Items]
Noninterest income	$ 508	$ 470

Derivative - Schedule of Intere

Derivative - Schedule of Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amount	$ 2,314,354	$ 2,350,759
1.3250% Interest Rate Swap
Derivative [Line Items]
Effective Date	Jun. 15, 2015
Maturity Date	Dec. 17, 2018
Notional Amount	$ 382,000
Fixed Rate	1.325%
Variable Rate	1 Month LIBOR
1.5120% Interest Rate Swap
Derivative [Line Items]
Effective Date	Jun. 30, 2015
Maturity Date	Dec. 31, 2019
Notional Amount	$ 300,000
Fixed Rate	1.512%
Variable Rate	1 Month LIBOR
1.5995% Interest Rate Swap
Derivative [Line Items]
Effective Date	Mar. 8, 2016
Maturity Date	Feb. 27, 2026
Notional Amount	$ 175,000
Fixed Rate	1.5995%
Variable Rate	1 Month LIBOR
1.5890% Interest Rate Swap
Derivative [Line Items]
Effective Date	Mar. 8, 2016
Maturity Date	Feb. 27, 2026
Notional Amount	$ 175,000
Fixed Rate	1.589%
Variable Rate	1 Month LIBOR

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Domestic
Time Deposits [Line Items]
Time deposits $250,000 and over	$ 401,900,000	$ 382,400,000
Foreign
Time Deposits [Line Items]
Time Deposits	$ 0	$ 0

Borrowed Funds - Additional Inf

Borrowed Funds - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2018	Dec. 31, 2017
Borrowed Funds [Line Items]
Unregistered multi tranche debt Transactions		$ 245,000
Unregistered debt transactions	$ 50,000
Subordinated debt			$ 98,746	$ 98,687
Subordinate debt capital treatment achievement period			10 years
FHLB advances			$ 150,000	$ 150,000
FHLB advances maturity period			2019-02	2018-01
Irrevocable letter of credit			$ 586,500	$ 386,500
FRB
Borrowed Funds [Line Items]
Borrowings from FRB			0	$ 0
SAFE Program Deposits
Borrowed Funds [Line Items]
Irrevocable letter of credit			$ 35,000
Letter of credit expiration date			Sep. 27, 2018
Letter of credit expiration period			45 days
Letter of credit extended expiration term			1 year
Treasury Management Deposit
Borrowed Funds [Line Items]
Irrevocable letter of credit			$ 550,000
Letter of credit expiration date			May 26, 2018
Letter of credit expiration period			45 days
Letter of credit extended expiration term			1 year
Commercial Loans | FRB
Borrowed Funds [Line Items]
Collateralized borrowings from FRB			$ 826,800
Commercial and Residential Real Estate Loan
Borrowed Funds [Line Items]
FHLB advances collateral amount			$ 1,400,000
4.875% Senior Notes, Due June 28, 2019
Borrowed Funds [Line Items]
Subordinated debt maturity period			4 years
5.375% Senior Notes, Due June 28, 2021
Borrowed Funds [Line Items]
Subordinated debt maturity period			7 years
7.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Borrowed Funds [Line Items]
Subordinated debt maturity period			15 years
Subordinated debt			$ 35,000
Call option period			10 years
6.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Borrowed Funds [Line Items]
Subordinated debt maturity period			15 years
Subordinated debt			$ 25,000
Call option period			10 years
6.500% Subordinated Notes, Due March 2025, Callable in 2020
Borrowed Funds [Line Items]
Subordinated debt			$ 40,000
Call option period			5 years
Minimum
Borrowed Funds [Line Items]
Repurchase agreement maturity period			P1D
Maximum
Borrowed Funds [Line Items]
Repurchase agreement maturity period			seven days

Borrowed Funds - Summary of Sec

Borrowed Funds - Summary of Securities Sold Under Agreements to Repurchase (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Balance at period end	$ 1,298,000	$ 1,026,000
Average balance during the period	$ 1,165,000	$ 3,371,000
Average interest rate during the period	0.25%	0.25%
Maximum month-end balance during the period	$ 1,298,000	$ 6,286,000

Borrowed Funds - Summary of Deb

Borrowed Funds - Summary of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance cost and unamortized premium	$ (1,476)	$ (1,606)
Total long-term debt	283,446	283,316
4.875% Senior Notes, Due June 28, 2019
Debt Instrument [Line Items]
Purchased senior notes	(10,078)	(10,078)
Cadence Bancorporation
Debt Instrument [Line Items]
Long-term debt, gross	270,000	270,000
Cadence Bancorporation | 4.875% Senior Notes, Due June 28, 2019
Debt Instrument [Line Items]
Long-term debt, gross	145,000	145,000
Cadence Bancorporation | 5.375% Senior Notes, Due June 28, 2021
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Cadence Bancorporation | 7.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Debt Instrument [Line Items]
Long-term debt, gross	35,000	35,000
Cadence Bancorporation | 6.500% Subordinated Notes, Due March 2025, Callable in 2020
Debt Instrument [Line Items]
Long-term debt, gross	40,000	40,000
Cadence 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 D73

Borrowed Funds - Summary of Debt (Parenthetical) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
4.875% Senior Notes, Due June 28, 2019
Debt Instrument [Line Items]
Debt instrument, interest rate	4.875%	4.875%
Debt instrument, maturity date	Jun. 28, 2019	Jun. 28, 2019
5.375% Senior Notes, Due June 28, 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	5.375%	5.375%
Debt instrument, maturity date	Jun. 28, 2021	Jun. 28, 2021
7.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	7.25%	7.25%
Debt instrument, maturity date	Jun. 28, 2029	Jun. 28, 2029
6.500% Subordinated Notes, Due March 2025, Callable in 2020
Debt Instrument [Line Items]
Debt instrument, interest rate	6.50%	6.50%
Debt instrument, maturity date	Mar. 31, 2025	Mar. 31, 2025
6.250% Subordinated Notes, Due June 28, 2029, Callable in 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	6.25%	6.25%
Debt instrument, maturity date	Jun. 28, 2029	Jun. 28, 2029

Borrowed Funds - Summary of Jun

Borrowed Funds - Summary of Junior Subordinated Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Junior subordinated debentures, gross	$ 50,619	$ 50,619
Purchase accounting adjustment, net of amortization	(14,028)	(14,147)
Total junior subordinated debentures	36,591	36,472
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 J75

Borrowed Funds - Summary of Junior Subordinated Debt (Parenthetical) (Details) - Junior subordinated debt	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
3 month LIBOR plus 2.85%, due 2033
Debt Instrument [Line Items]
Debt instrument, interest rate	2.85%	2.85%
Debt instrument maturity year	2,033	2,033
3 month LIBOR plus 2.95%, due 2033
Debt Instrument [Line Items]
Debt instrument, interest rate	2.95%	2.95%
Debt instrument maturity year	2,033	2,033
3 month LIBOR plus 1.75%, due 2037
Debt Instrument [Line Items]
Debt instrument, interest rate	1.75%	1.75%
Debt instrument maturity year	2,037	2,037

Other Noninterest Income and 76

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, 2018	Mar. 31, 2017
Other noninterest income
Insurance revenue	$ 2,259	$ 2,130
Bankcard fees	1,884	1,812
Income from bank owned life insurance policies	935	1,059
Other	132	476
Total other noninterest income	5,210	5,477
Other noninterest expenses
Net cost of operation of other real estate owned	(52)	296
Data processing expense	2,365	1,696
Consulting and professional fees	2,934	1,139
Loan related expenses	255	280
FDIC Insurance	955	1,493
Communications	704	655
Advertising and public relations	341	345
Legal expenses	2,627	471
Other	6,074	5,745
Total other noninterest expenses	$ 16,203	$ 12,120

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 10,950		$ 12,639
Effective tax rate	22.00%		32.60%
Statutory Federal income tax rate	21.00%		35.00%
Provisional income tax expense relating to from Tax Reform		$ 19,000

Earnings Per Common Share - Rec

Earnings Per Common Share - Reconciliation of Basic and Diluted Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 38,825	$ 26,117
Weighted average common shares outstanding (Basic)	83,625,000	75,000,000
Weighted average restricted stock units	1,049,807	672,750
Weighted average common shares outstanding (Diluted)	84,674,807	75,672,750
Earnings per common share (Basic)	$ 0.46	$ 0.35
Earnings per common share (Diluted)	$ 0.46	$ 0.35

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 leverage	$ 1,120,451	$ 1,096,438
Common equity tier 1 capital (transitional)	1,081,809	1,058,888
Tier 1 risk-based capital	1,120,451	1,096,438
Total risk-based capital	1,311,834	1,283,561
Tier 1 leverage	423,950	410,770
Common equity tier 1 capital (transitional)	467,253	450,951
Tier 1 risk-based capital	623,004	601,269
Total risk-based capital	$ 830,672	$ 801,691
Tier 1 leverage	10.60%	10.70%
Common equity tier 1 capital (transitional)	10.40%	10.60%
Tier 1 risk-based capital	10.80%	10.90%
Total risk-based capital	12.60%	12.80%
Tier 1 leverage	4.00%	4.00%
Common equity tier 1 capital (transitional)	4.50%	4.50%
Tier 1 risk-based capital	6.00%	6.00%
Total risk-based capital	8.00%	8.00%
Cadence Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 leverage	$ 1,225,079	$ 1,198,234
Common equity tier 1 capital (transitional)	1,175,079	1,149,181
Tier 1 risk-based capital	1,225,079	1,198,234
Total risk-based capital	1,342,433	1,311,376
Tier 1 leverage	423,855	410,743
Common equity tier 1 capital (transitional)	467,093	450,874
Tier 1 risk-based capital	622,790	601,165
Total risk-based capital	830,387	801,553
Tier 1 leverage	529,818	513,429
Common equity tier 1 capital (transitional)	674,689	651,262
Tier 1 risk-based capital	830,387	801,553
Total risk-based capital	$ 1,037,984	$ 1,001,941
Tier 1 leverage	11.60%	11.70%
Common equity tier 1 capital (transitional)	11.30%	11.50%
Tier 1 risk-based capital	11.80%	12.00%
Total risk-based capital	12.90%	13.10%
Tier 1 leverage	4.00%	4.00%
Common equity tier 1 capital (transitional)	4.50%	4.50%
Tier 1 risk-based capital	6.00%	6.00%
Total risk-based capital	8.00%	8.00%
Tier 1 leverage	5.00%	5.00%
Common equity tier 1 capital (transitional)	6.50%	6.50%
Tier 1 risk-based capital	8.00%	8.00%
Total risk-based capital	10.00%	10.00%

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Banking And Thrift [Abstract]
Reserve requirement with FRB	$ 70.7	$ 70.9

Commitments and Contingent Li81

Commitments and Contingent Liabilities - Summary of Commitments and Contingent Liabilities (Details) $ in Thousands	Mar. 31, 2018USD ($)
Commitments to Grant Loans
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Commitments to grant loans	$ 238,624
Standby Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Letters of credit	98,701
Performance Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Performance letters of credit	29,178
Commercial Letters of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Letters of credit	2,926
Commitments to Extend Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Commitments to extend credit	$ 3,413,043

Commitments and Contingent Li82

Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Unfunded commitments - LLC Investments	$ 22.6	$ 20.3

Supplemental Cash Flow Inform83

Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash paid during the year for:
Interest	$ 19,217	$ 12,776
Income taxes, net of refunds	(82)	(219)
Non-cash investing activities (at fair value):
Transfers of loans to other real estate	1,548	3,489
Transfers of commercial loans to loans held for sale	$ 3,500	$ 39,249

Disclosure About Fair Values 84

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, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	$ 1,246,005	$ 1,257,063
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Derivative assets	6,303	3,958
Derivative liabilities	38,634	25,280
Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	1,246,005	1,257,063
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Derivative assets	6,303	3,985
Net profits interests	14,295	15,833
Investments in limited partnerships	7,514
Derivative liabilities	38,634	25,307
Fair Value, Measurements, Recurring | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	1,246,006	1,257,063
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Derivative assets	6,303	3,985
Net profits interests	14,295	15,833
Investments in limited partnerships	7,514
Total recurring basis measured assets	1,279,947	1,282,766
Derivative liabilities	38,634	25,307
Total recurring basis measured liabilities	38,634	25,307
Fair Value, Measurements, Recurring | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Total recurring basis measured assets	5,829	5,885
Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	1,246,006	1,257,063
Derivative assets	6,303	3,985
Total recurring basis measured assets	1,252,309	1,261,048
Derivative liabilities	38,634	25,307
Total recurring basis measured liabilities	38,634	25,307
Fair Value, Measurements, Recurring | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net profits interests	14,295	15,833
Investments in limited partnerships	7,514
Total recurring basis measured assets	21,809	15,833
U.S. Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	95,930	96,844
U.S. Treasury Securities | Fair Value, Measurements, Recurring | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	95,930	96,844
U.S. Treasury Securities | Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	95,930	96,844
Obligations of U.S. Government Agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	99,835	81,224
Obligations of U.S. Government Agencies | Fair Value, Measurements, Recurring | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	99,835	81,224
Obligations of U.S. Government Agencies | Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	99,835	81,224
Residential Pass-through | Fair Value, Measurements, Recurring | Guaranteed by GNMA | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	97,542	106,027
Residential Pass-through | Fair Value, Measurements, Recurring | Guaranteed by GNMA | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	97,542	106,027
Residential Pass-through | Fair Value, Measurements, Recurring | Issued by FNMA and FHLMC | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	433,085	430,422
Residential Pass-through | Fair Value, Measurements, Recurring | Issued by FNMA and FHLMC | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	433,085	430,422
Other Residential Mortgage-Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	42,821	46,392
Other Residential Mortgage-Backed Securities | Fair Value, Measurements, Recurring | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	42,821	46,392
Other Residential Mortgage-Backed Securities | Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	42,821	46,392
Commercial Mortgage-Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	70,736	72,195
Commercial Mortgage-Backed Securities | Fair Value, Measurements, Recurring | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	70,736	72,195
Commercial Mortgage-Backed Securities | Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	70,736	72,195
Total MBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	644,184	655,036
Total MBS | Fair Value, Measurements, Recurring | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	644,184	655,036
Total MBS | Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	644,184	655,036
Obligations of States and Municipal Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	406,056	423,959
Obligations of States and Municipal Subdivisions | Fair Value, Measurements, Recurring | Carrying Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	406,057	423,959
Obligations of States and Municipal Subdivisions | Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investment securities available-for-sale	$ 406,057	$ 423,959

Disclosure About Fair Values 85

Disclosure About Fair Values of Financial Instruments - Summary of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
ASU 2016-01
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Adjustment recorded in retained earnings due to adoption of ASU 2016-01	$ 1,000	$ 95
Fair Value, Measurements, Recurring | Net Profits Interests
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 15,833	15,833	$ 19,425
Net (losses) gains included in earnings		(869)	(2,645)
Distributions received		(669)	(230)
Ending Balance		14,295	16,550
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period		(869)	$ (2,645)
Fair Value, Measurements, Recurring | Investments in Limited Partnerships
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Net (losses) gains included in earnings		676
Contributions paid		225
Distributions received		(106)
Ending Balance		7,514
Net unrealized (losses) gains included in earnings relating to assets held at the end of the period		676
Fair Value, Measurements, Recurring | Investments in Limited Partnerships | ASU 2016-01
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Transfers in due to adoption of ASU 2016-01		5,518
Adjustment recorded in retained earnings due to adoption of ASU 2016-01		$ 1,201

Disclosure About Fair Values 86

Disclosure About Fair Values of Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair value inputs, increase (decrease) in discount rate		5.00%
ASU 2016-01
Adjustment to retained earnings	$ 1,000	$ 95
ASU 2016-01 | Level 3
Adjustment to retained earnings	$ 1,200
Discounted Cash Flow | Net Recoverable Oil and Gas Reserves and Forward Looking Commodity Prices
Fair value inputs, discount rate		10.00%
Discounted Cash Flow | Net Recoverable Oil and Gas Reserves and Forward Looking Commodity Prices | Level 3
Fair value inputs, discount rate			9.00%

Disclosure About Fair Values 87

Disclosure About Fair Values of Financial Instruments - Summary of Assets Recorded at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans, net of specific allowance	$ 293,349	$ 278,587
Other real estate	6,642	7,605
Fair Value, Nonrecurring
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale	37,446	61,359
Impaired loans, net of specific allowance	50,829	65,087
Other real estate	6,642	7,605
Total assets measured on a nonrecurring basis	94,917	134,051
Fair Value, Nonrecurring | Level 2
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale	37,446	61,359
Total assets measured on a nonrecurring basis	37,446	61,359
Fair Value, Nonrecurring | Level 3
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans, net of specific allowance	50,829	65,087
Other real estate	6,642	7,605
Total assets measured on a nonrecurring basis	$ 57,471	$ 72,692

Disclosure About Fair Values 88

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) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Discounted Cash Flow | Net Recoverable Oil and Gas Reserves and Forward Looking Commodity Prices
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value inputs, discount rate		10.00%
Level 3 | Discount of Fair Value | Impaired Loans Net Of Specific Allowance
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying Value		$ 50,829	$ 65,087
Valuation Methods		Appraised value, as adjusted	Appraised value, as adjusted
Unobservable Inputs		Discount to fair value	Discount to fair value
Level 3 | Discount of Fair Value | Impaired Loans Net Of Specific Allowance | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range		0.00%	0.00%
Level 3 | Discount of Fair Value | Impaired Loans Net Of Specific Allowance | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range		50.00%	50.00%
Level 3 | Discount of Fair Value | Other
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying Value		$ 6,642	$ 7,605
Valuation Methods		Appraised value, as adjusted	Appraised value, as adjusted
Unobservable Inputs		Discount to fair value	Discount of fair value
Level 3 | Discount of Fair Value | Other | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range		0.00%	0.00%
Level 3 | Discount of Fair Value | Other | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range		20.00%	20.00%
Level 3 | Discounted Cash Flow
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Valuation Methods		Discounted cash flow	Discounted cash flow
Unobservable Inputs		Discount rates - 3.1% to 6.8%	Discount rates - 3.6% to 8.0%
Level 3 | Discounted Cash Flow | Net Recoverable Oil and Gas Reserves and Forward Looking Commodity Prices
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Valuation Methods		Discounted cash flow	Discounted cash flow
Unobservable Inputs		Net recoverable oil and gas reserves and forward-looking commodity prices. Discount rate - 9% to 10%	Net recoverable oil and gas reserves and forward-looking commodity prices. Discount rate - 9%
Fair value inputs, discount rate			9.00%
Level 3 | Discounted Cash Flow | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range	[1]	0.00%	0.00%
Fair value inputs, discount rate		3.10%	3.60%
Level 3 | Discounted Cash Flow | Minimum | Net Recoverable Oil and Gas Reserves and Forward Looking Commodity Prices
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range	[1]	0.00%	0.00%
Fair value inputs, discount rate		9.00%
Level 3 | Discounted Cash Flow | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range	[1]	2.00%	1.00%
Fair value inputs, discount rate		6.80%	8.00%
Level 3 | Discounted Cash Flow | Maximum | Net Recoverable Oil and Gas Reserves and Forward Looking Commodity Prices
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Range	[1]	7.00%	29.00%
Fair value inputs, discount rate		10.00%
Level 3 | 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		10.00%	10.00%
[1]	Represents fair value as a percent of the unpaid principal balance.

Disclosure About Fair Values 89

Disclosure About Fair Values of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial Assets:
Interest-bearing deposits with banks	$ 281,297	$ 482,568
Federal funds sold	4,695	9,536
Securities available-for-sale	1,246,005	1,257,063
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Derivative assets	6,303	3,958
Estimated fair value of held-to-maturity securities		311
Financial Liabilities:
FHLB advances	150,000	150,000
Securities sold under agreements to repurchase	1,298	1,026
Senior debt	184,700	184,629
Subordinated debt	98,746	98,687
Junior subordinated debentures	36,591	36,472
Derivative liabilities	38,634	25,280
Carrying Amount
Financial Assets:
Cash and due from banks	130,704	238,707
Interest-bearing deposits with banks	281,297	482,568
Federal funds sold	4,695	9,536
Securities available-for-sale	1,246,005	1,257,063
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Loans held for sale	37,446	61,359
Net loans	8,555,450	8,165,851
Derivative assets	6,303	3,985
Net profits interests	14,295	15,833
Investments in limited partnerships	7,514
Estimated fair value of held-to-maturity securities		290
Financial Liabilities:
Deposits	9,048,971	9,011,515
FHLB advances	150,000	150,000
Securities sold under agreements to repurchase	1,298	1,026
Senior debt	184,700	184,629
Subordinated debt	98,746	98,687
Junior subordinated debentures	36,591	36,472
Derivative liabilities	38,634	25,307
Fair Value
Financial Assets:
Cash and due from banks	130,704	238,707
Interest-bearing deposits with banks	281,297	482,568
Federal funds sold	4,695	9,536
Securities available-for-sale	1,246,005	1,257,063
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Loans held for sale	37,446	61,359
Net loans	8,437,656	8,134,903
Derivative assets	6,303	3,985
Net profits interests	14,295	15,833
Investments in limited partnerships	7,514
Estimated fair value of held-to-maturity securities		311
Financial Liabilities:
Deposits	9,045,299	9,006,890
FHLB advances	150,000	150,000
Securities sold under agreements to repurchase	1,298	1,026
Senior debt	193,529	194,484
Subordinated debt	98,101	94,724
Junior subordinated debentures	49,019	49,161
Derivative liabilities	38,634	25,307
Fair Value | Level 1
Financial Assets:
Cash and due from banks	130,704	238,707
Interest-bearing deposits with banks	281,297	482,568
Federal funds sold	4,695	9,536
Equity securities with readily determinable fair values not held for trading	5,829	5,885
Fair Value | Level 2
Financial Assets:
Securities available-for-sale	1,246,005	1,257,063
Loans held for sale	37,446	61,359
Derivative assets	6,303	3,985
Estimated fair value of held-to-maturity securities		311
Financial Liabilities:
Deposits	9,045,299	9,006,890
FHLB advances	150,000	150,000
Securities sold under agreements to repurchase	1,298	1,026
Senior debt	193,529	194,484
Subordinated debt	98,101	94,724
Junior subordinated debentures	49,019	49,161
Derivative liabilities	38,634	25,307
Fair Value | Level 3
Financial Assets:
Net loans	8,437,656	8,134,903
Net profits interests	14,295	$ 15,833
Investments in limited partnerships	$ 7,514

Segment Reporting - Additional

Segment Reporting - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018Segment
Segment Reporting [Abstract]
Number of operating segments	3

Segment Reporting - Summary of

Segment Reporting - Summary of Operating Results of Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 91,111	$ 74,758
Provision for credit losses	4,380	5,786
Noninterest income	24,983	24,105
Noninterest expense	61,939	54,321
Income tax expense (benefit)	10,950	12,639
Net income	38,825	26,117
Total assets	10,999,382	9,720,937	$ 10,948,926
Banking
Segment Reporting Information [Line Items]
Net interest income	96,100	79,103
Provision for credit losses	4,380	5,786
Noninterest income	12,438	11,700
Noninterest expense	50,532	45,457
Income tax expense (benefit)	12,446	13,846
Net income	41,180	25,714
Total assets	10,903,031	9,629,061
Financial Services
Segment Reporting Information [Line Items]
Net interest income	(607)	784
Noninterest income	12,358	12,321
Noninterest expense	9,977	8,681
Income tax expense (benefit)	308	1,548
Net income	1,466	2,876
Total assets	91,468	88,644
Corporate
Segment Reporting Information [Line Items]
Net interest income	(4,382)	(5,129)
Noninterest income	187	84
Noninterest expense	1,430	183
Income tax expense (benefit)	(1,804)	(2,755)
Net income	(3,821)	(2,473)
Total assets	$ 4,883	$ 3,232

Equity-based Compensation - Add

Equity-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense	$ 0.4	$ 0.4
Remaining expense related to unvested restricted stock units	$ 1
Expense recognition period	8 months
Number of shares outstanding, non-vested	672,750
Fair value per unit at grant date, non-vested	$ 5.14
Restricted stock granted	0
Stock units forfeited	0
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	6,827,250

Accumulated Other Comprehensi93

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 1,359,056
Net change	(31,778)	$ (1,128)
Balance	1,357,103
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(2,160)
Net change	(23,401)
Balance	(25,561)
Unrealized Gains (Losses) on Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(531)
Balance	(531)
Unrealized Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(16,342)
Net change	(8,377)
Balance	(24,719)
Accumulated OCI
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(19,033)
Net change	(31,778)
Balance	$ (50,811)

Variable Interest Entities an94

Variable Interest Entities and Other Investments - Additional Information (Details) - Variable Interest Entity, Not Primary Beneficiary	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016Customer
Variable Interest Entities and Other Investments [Line Items]
Cost method investments	$ 7,500,000
Gain recognized from assets at fair value	700,000
Equity method investments	8,700,000
Number of loan customers | Customer			2
Net Profits interest	14,300,000	$ 15,800,000
Rabbi Trust
Variable Interest Entities and Other Investments [Line Items]
Defined rabbi trust assets and benefit obligation	3,700,000	3,600,000
Limited Partner
Variable Interest Entities and Other Investments [Line Items]
Equity method investments	8,800,000
ASU 2016-01
Variable Interest Entities and Other Investments [Line Items]
Cost method investments		14,000,000
Equity method investments		8,800,000
Other Assets
Variable Interest Entities and Other Investments [Line Items]
Investments in affordable Housing Project	$ 7,500,000	$ 7,900,000

Variable Interest Entities an95

Variable Interest Entities and Other Investments - Summary of Investment in Limited Partnerships Subsequent to Adoption of ASU 2016-01 (Details) - Investments in Limited Partnerships $ in Thousands	Mar. 31, 2018USD ($)
Variable Interest Entities and Other Investments [Line Items]
Affordable housing projects (amortized cost)	$ 7,479
Limited partnerships accounted for under the fair value practical expedient of NAV	7,514
Limited partnerships without readily determinable fair values that do not qualify for the practical expedient of NAV accounted for under the cost method	8,692
Equity method investments	8,797
Total investments in limited partnerships	$ 32,482

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	May 13, 2018	Apr. 25, 2018	Apr. 02, 2018	Mar. 31, 2018	Dec. 31, 2018	May 14, 2018	May 11, 2018
Subsequent Event [Line Items]
Cash dividend per share				$ 0.125
Scenario Plan | Common Stock
Subsequent Event [Line Items]
Cash dividend per share					$ 0.50
Restricted Stock Units
Subsequent Event [Line Items]
Restricted stock granted				0
Subsequent Event
Subsequent Event [Line Items]
Percentage of share held by parent after closing							65.00%
Subsequent Event | Cadence Bank | Asset Purchase Agreement with Unrelated Third Party
Subsequent Event [Line Items]
Net asset held-for-sale						$ 16
Subsequent Event | Stock-for-stock transaction
Subsequent Event [Line Items]
Closing share price							$ 30.23
Subsequent Event | State Bank Financial Corporation
Subsequent Event [Line Items]
Percentage of shares held after closing							35.00%
Subsequent Event | State Bank Financial Corporation | Stock-for-stock transaction | Class A Common Stock
Subsequent Event [Line Items]
Number of common shares entitled to receive for each share under merger agreement	1.160
Transaction amount	$ 1,400
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Dividend declared date		Apr. 25, 2018
Cash dividend per share		$ 0.125
Dividend paid date		Jun. 15, 2018
Dividend record date		Jun. 1, 2018
Plan | Subsequent Event | Restricted Stock Units
Subsequent Event [Line Items]
Restricted stock granted			270,105
Plan | Subsequent Event | Restricted Stock Units | Half of Units Granted
Subsequent Event [Line Items]
Award vesting period			3 years
Plan | Subsequent Event | Restricted Stock Units | Remaining Half of Units Granted
Subsequent Event [Line Items]
Award vesting period			3 years
Award vesting rights			The remaining half of the restricted stock units vest equally on March 31 of each of the next three years
Plan | Subsequent Event | Restricted Stock Units | Minimum | Half of Units Granted
Subsequent Event [Line Items]
Award vesting rights, percentage			0.00%
Plan | Subsequent Event | Restricted Stock Units | Maximum | Half of Units Granted
Subsequent Event [Line Items]
Award vesting rights, percentage			200.00%