Texas Capital Bancshares (TCBI) 10-Q 22 Apr 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 21, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-34657
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	75-2679109
Entity Address, Address Line One	2000 McKinney Avenue
Entity Address, Address Line Two	Suite 700
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Country	US
Entity Address, Postal Zip Code	75201
City Area Code	214
Local Phone Number	932-6600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001077428
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		50,581,310
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	TCBI
Security Exchange Name	NASDAQ
Series A Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	6.5% Non-Cumulative Perpetual Preferred Stock Series A, par value $0.01 per share
Trading Symbol	TCBIP
Security Exchange Name	NASDAQ
Series B Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	5.75% Non-Cumulative Perpetual Preferred Stock Series B, par value $0.01 per share
Trading Symbol	TCBIO
Security Exchange Name	NASDAQ

Operations and Summary of Signi

Operations and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operations and Summary of Significant Accounting Policies	Operations and Summary of Significant Accounting Policies Organization and Nature of Business Texas Capital Bancshares, Inc. (the "Company” or "TCBI"), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the "Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional or national clientele of commercial borrowers. We are primarily a secured lender, with the majority of our loans held for investment, excluding mortgage finance loans and other national lines of business, being made to businesses headquartered or with operations in Texas. Our national lines of business provide specialized lending products to businesses throughout the United States. Basis of Presentation Our accounting and reporting policies conform to accounting principles generally accepted in the United States ("GAAP") and to generally accepted practices within the banking industry. Certain prior period balances have been reclassified to conform to the current period presentation. The consolidated interim financial statements are unaudited and certain information and footnote disclosures presented in accordance with GAAP have been condensed or omitted. In the opinion of management, the interim financial statements include all normal and recurring adjustments and the disclosures made are adequate to make the interim financial information not misleading. The consolidated financial statements have been prepared in accordance with GAAP for interim financial information and the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2020, included in our Annual Report on Form 10-K for the year ended December 31, 2020 (the "2020 Form 10-K"). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. Subsequent Event On April 20, 2021, we entered into an agreement to sell our portfolio of mortgage servicing rights to a third party. The third party has also, in a separate letter of intent, agreed to extend employment opportunities to many of the Company’s Mortgage Correspondent Aggregation (“MCA”) employees and the Company has agreed to make best efforts to cooperate in transitioning its MCA client base to the third party, resulting in the wind-down of the Company’s MCA program. The sale and transition of employees and clients is expected to be completed in the second quarter of 2021, subject to customary closing conditions, and will result in the Company recording an expected gain on sale of mortgage servicing rights ("MSRs") and severance costs in the second quarter of 2021, both of which are not expected to be material. 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. Actual results could differ from those estimates. The allowance for credit losses, the fair value of financial instruments and the status of contingencies are particularly susceptible to significant change.

New Accounting Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Standards	New Accounting Standards ASU 2020-04, "Reference Rate Reform (Topic 848)" ("ASU 2020-04") provides optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. For transactions that are modified because of reference rate reform and that meet certain scope guidance (i) modifications of loan agreements should be accounted for by prospectively adjusting the effective interest rate and the modification will be considered "minor" so that any existing unamortized origination fees/costs would carry forward and continue to be amortized and (ii) modifications of lease agreements should be accounted for as a continuation of the existing agreement with no reassessments of the lease classification and the discount rate or remeasurements of lease payments that otherwise would be required for modifications not accounted for as separate contracts. ASU 2020-04 also provides numerous optional expedients for derivative accounting. ASU 2020-04 is effective March 12, 2020 through December 31, 2022. An entity may elect to apply ASU 2020-04 for contract modifications as of January 1, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic within the Codification, the amendments in this ASU must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. We anticipate this ASU will simplify any modifications we execute between the selected start date (yet to be determined) and December 31, 2022 that are directly related to LIBOR transition by allowing prospective recognition of the continuation of the contract, rather than extinguishment of the old contract resulting in writing off unamortized fees/costs. We are evaluating the impacts of this ASU and have not yet determined whether LIBOR transition and this ASU will have material effects on our business operations and consolidated financial statements.

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 215,835,000	$ 173,573,000
Interest-bearing deposits in other banks	11,212,276,000	9,032,807,000
Investment securities	3,443,058,000	3,196,970,000
Loans held for sale ($176.3 million and $239.1 million at March 31, 2021 and December 31, 2020, respectively, at fair value)	176,286,000	283,165,000
Loans held for investment, mortgage finance	9,009,081,000	9,079,409,000
Loans held for investment (net of unearned income)	15,399,174,000	15,351,451,000
Less: Allowance for credit losses on loans	(242,484,000)	(254,615,000)
Loans held for investment, net	24,165,771,000	24,176,245,000
Mortgage servicing rights, net	121,096,000	105,424,000
Premises and equipment, net	23,346,000	24,546,000
Accrued interest receivable and other assets	679,199,000	715,699,000
Goodwill and intangible assets, net	17,566,000	17,667,000
Total assets	40,054,433,000	37,726,096,000
Deposits:
Non-interest-bearing	15,174,642,000	12,740,947,000
Interest-bearing	18,217,328,000	18,255,642,000
Total deposits	33,391,970,000	30,996,589,000
Accrued interest payable	5,629,000	11,150,000
Other liabilities	316,797,000	339,486,000
Federal funds purchased and repurchase agreements	115,587,000	111,751,000
Other borrowings	2,400,000,000	3,000,000,000
Long-term Debt	664,968,000	395,896,000
Total liabilities	36,894,951,000	34,854,872,000
Comprehensive income:
Preferred stock, $.01 par value, $1,000 liquidation value: Authorized shares - 10,000,000; Issued shares - 6,000,000 shares issued at December 31, 2018 and 2017	450,000,000	150,000,000
Common stock, $.01 par value: Authorized shares - 100,000,000; Issued shares - 45,735,424 and 41,036,787 at December 31, 2018 and 2017, respectively	505,000	504,000
Additional paid-in capital	984,207,000	991,898,000
Retained earnings	1,781,215,000	1,713,056,000
Treasury stock (shares at cost: 417 at March 31, 2021 and December 31, 2020)	(8,000)	(8,000)
Accumulated other comprehensive income/(loss), net of taxes	(56,437,000)	15,774,000
Total stockholders’ equity	3,159,482,000	2,871,224,000
Total liabilities and stockholders’ equity	40,054,433,000	37,726,096,000
Loans held for sale ($176.3 million and $239.1 million at March 31, 2021 and December 31, 2020, respectively, at fair value)	$ 176,300,000	$ 239,100,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, Liquidation value	$ 1,000	$ 1,000
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	6,300,000	6,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	50,558,184	50,470,867
Treasury stock, shares	417	417

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Loans held for sale ($176.3 million and $239.1 million at March 31, 2021 and December 31, 2020, respectively, at fair value)	$ 176,300,000	$ 239,100,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, Liquidation value	$ 1,000	$ 1,000
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	6,300,000	6,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	50,558,184	50,470,867
Treasury stock, shares	417	417

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income
Interest and fees on loans	$ 215,592	$ 283,625
Investment securities	9,887	2,183
Federal funds sold and securities purchased under resale agreements	1	614
Interest-bearing deposits in other banks	2,932	19,586
Total interest income	228,412	306,008
Interest expense
Deposits	20,004	62,174
Federal funds purchased	75	669
Other borrowings	2,517	9,582
Long-term debt	5,743	5,264
Total interest expense	28,339	77,689
Net interest income	200,073	228,319
Provision for credit losses	(6,000)	96,000
Net interest income after provision for credit losses	206,073	132,319
Non-interest income
Service charges on deposit accounts	4,716	3,293
Wealth management and trust fee income	2,855	2,467
Brokered loan fees	9,311	8,015
Servicing income	9,009	4,746
Swap fees	526	2,757
Net gain/(loss) on sale of loans held for sale	5,572	(13,000)
Other	7,103	3,502
Total non-interest income	39,092	11,780
Non-interest expense
Salaries and employee benefits	87,522	77,193
Net occupancy expense	8,274	8,712
Marketing	1,697	8,522
Legal and professional	8,277	17,466
Communications and technology	15,969	13,791
FDIC insurance assessment	6,613	5,849
Servicing-related expenses	12,989	16,354
Merger-related expenses	0	7,270
Other	8,975	10,260
Total non-interest expense	150,316	165,417
Income/(loss) before income taxes	94,849	(21,318)
Income tax expense/(benefit)	22,911	(4,631)
Net income/(loss)	71,938	(16,687)
Preferred stock dividends	3,779	2,438
Net income/(loss) available to common stockholders	68,159	(19,125)
Other comprehensive loss
Change in unrealized gain/(loss) on available-for-sale debt securities arising during period, before tax	(91,407)	(5,292)
Income tax expense/(benefit)	(19,196)	(1,111)
Other comprehensive loss, net of tax	(72,211)	(4,181)
Comprehensive loss	$ (273)	$ (20,868)
Basic earnings/(loss) per common share
Basic earnings/(loss) per common share	$ 1.35	$ (0.38)
Diluted earnings/(loss) per common share
Diluted earnings/(loss) per common share	$ 1.33	$ (0.38)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period Of Adoption, Adjustment	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained EarningsCumulative Effect, Period Of Adoption, Adjustment	Treasury Stock	Accumulated Other Comprehensive Income
Beginning balance - Shares at Dec. 31, 2019			(6,000,000)	(50,338,158)				(417)
Beginning balance - Amount at Dec. 31, 2019	$ 2,801,321	$ (7,154)	$ 150,000	$ 503	$ 978,205	$ 1,663,671	$ (7,154)	$ (8)	$ 8,950
Comprehensive income:
Net income	(16,687)					(16,687)
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	(4,181)								(4,181)
Comprehensive loss	(20,868)
Stock-based compensation expense recognized in earnings	3,227				3,227
Preferred stock dividend	(2,438)					(2,438)
Issuance of stock related to stock-based awards - Shares				70,037
Issuance of stock related to stock-based awards - Amount	(1,492)			$ 1	(1,493)
Ending balance - Amount at Mar. 31, 2020	2,772,596		$ 150,000	$ 504	979,939	1,637,392		$ (8)	4,769
Ending balance - Shares at Mar. 31, 2020			(6,000,000)	(50,408,195)				(417)
Beginning balance - Shares at Dec. 31, 2020			(6,000,000)	(50,470,867)				(417)
Beginning balance - Amount at Dec. 31, 2020	2,871,224		$ 150,000	$ 504	991,898	1,713,056		$ (8)	15,774
Comprehensive income:
Net income	71,938					71,938
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	(72,211)								(72,211)
Comprehensive loss	(273)
Stock-based compensation expense recognized in earnings	$ 5,461				5,461
Issuance of preferred stock - Shares	300,000
Issuance of preferred stock - Amount	$ 289,723		300,000		(10,277)
Preferred stock dividend	(3,779)					(3,779)
Issuance of stock related to stock-based awards - Shares				87,317
Issuance of stock related to stock-based awards - Amount	(2,874)			$ 1	(2,875)
Ending balance - Amount at Mar. 31, 2021	$ 3,159,482		$ 450,000	$ 505	$ 984,207	$ 1,781,215		$ (8)	$ (56,437)
Ending balance - Shares at Mar. 31, 2021			(6,300,000)	(50,558,184)				(417)

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Income tax expense (benefit) related to unrealized loss on available-for-sale securities	$ (19,196)	$ (1,111)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income	$ 71,938	$ (16,687)
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(6,000)	96,000
Depreciation and amortization	26,067	13,122
Net (gain)/loss on sale of loans held for sale	(5,572)	13,000
Increase/(decrease) in valuation allowance on mortgage servicing rights	(16,448)	10,015
Stock-based compensation expense	6,368	3,369
Purchases and originations of loans held for sale	(1,133,239)	(2,356,710)
Proceeds from sales and repayments of loans held for sale	1,233,725	4,126,102
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	48,927	(141,940)
Accrued interest payable and other liabilities	(27,335)	39,473
Net cash provided by operating activities	198,431	1,785,744
Investing activities
Purchases of investment securities	(461,381)	(1,951)
Principal payments received on investment securities	118,316	4,788
Originations of mortgage finance loans	(48,097,222)	(37,932,501)
Proceeds from pay-offs of mortgage finance loans	48,167,550	38,513,547
Net increase in loans held for investment, excluding mortgage finance loans	(54,141)	(438,869)
Purchase of premises and equipment, net	(924)	(1,007)
Net cash provided by/(used in) investing activities	(327,802)	144,007
Financing activities
Net increase in deposits	2,395,381	655,670
Costs from issuance of stock related to stock-based awards and warrants	(2,874)	(1,492)
Net proceeds from issuance of preferred stock	289,723	0
Preferred dividends paid	(3,779)	(2,438)
Net increase/(decrease) in other borrowings		2,500,000
Net increase/(decrease) in other borrowings	(600,000)
Net increase in federal funds purchased and repurchase agreements	3,836	153,501
Net proceeds from issuance of long-term debt	268,815	0
Net cash provided by financing activities	2,351,102	3,305,241
Net increase in cash and cash equivalents	2,221,731	5,234,992
Cash and cash equivalents at beginning of period	9,206,380	4,425,583
Cash and cash equivalents at end of period	11,428,111	9,660,575
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	33,860	73,480
Cash paid during the period for income taxes	$ 440	$ 519

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Investment Securities	Investment Securities Available-for-Sale Debt Securities The following is a summary of available-for-sale debt securities: (in thousands) Amortized Gross Gross Estimated March 31, 2021 Available-for-sale debt securities: U.S. government agency securities $ 125,000 $ — $ (5,160) $ 119,840 Residential mortgage-backed securities 3,166,816 367 (71,396) 3,095,787 Tax-exempt asset-backed securities 173,569 7,997 — 181,566 Credit risk transfer securities 14,713 — (3,248) 11,465 Total $ 3,480,098 $ 8,364 $ (79,804) $ 3,408,658 December 31, 2020 Available-for-sale debt securities: U.S. government agency securities $ 125,000 $ 1 $ (1,412) $ 123,589 Residential mortgage-backed securities 2,818,518 11,566 (1,128) 2,828,956 Tax-exempt asset-backed securities 184,940 14,236 — 199,176 Credit risk transfer securities 14,713 — (3,296) 11,417 Total $ 3,143,171 $ 25,803 $ (5,836) $ 3,163,138 (1) Excludes accrued interest receivable of $6.3 million and $6.0 million at March 31, 2021 and December 31, 2020, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets. The amortized cost and estimated fair value, excluding accrued interest receivable, and weighted average yield of available-for-sale debt securities are presented below by contractual maturity: (in thousands, except percentage data) Less Than After One After Five After Ten Total March 31, 2021 Available-for-sale: U.S. government agency securities:(1) Amortized cost $ — $ — $ 125,000 $ — $ 125,000 Estimated fair value — — 119,840 — 119,840 Weighted average yield(3) — % — % 1.13 % — % 1.13 % Residential mortgage-backed securities:(1) Amortized cost $ — $ 449 $ 17,368 $ 3,148,999 $ 3,166,816 Estimated fair value — 499 16,442 3,078,846 3,095,787 Weighted average yield(3) — % 4.59 % 1.08 % 1.16 % 1.16 % Tax-exempt asset-backed securities:(1) Amortized Cost $ — $ — $ — $ 173,569 $ 173,569 Estimated fair value — — — 181,566 181,566 Weighted average yield(2)(3) — % — % — % 4.95 % 4.95 % CRT securities:(1) Amortized Cost $ — $ — $ — $ 14,713 $ 14,713 Estimated fair value — — — 11,465 11,465 Weighted average yield(3) — % — % — % 0.11 % 0.11 % Total available-for-sale debt securities: Amortized cost $ 3,480,098 Estimated fair value $ 3,408,658 December 31, 2020 Available-for-sale: U.S. government agency securities:(1) Amortized cost $ — $ — $ 125,000 $ — $ 125,000 Estimated fair value — — 123,589 — 123,589 Weighted average yield(3) — % — % 1.13 % — % 1.13 % Residential mortgage-backed securities:(1) Amortized cost $ — $ 545 $ 17,500 $ 2,800,473 $ 2,818,518 Estimated fair value — 605 17,490 2,810,861 2,828,956 Weighted average yield(3) — % 4.58 % 1.08 % 1.25 % 1.25 % Tax-exempt asset-backed securities:(1) Amortized Cost $ — $ — $ — $ 184,940 $ 184,940 Estimated fair value — — — 199,176 199,176 Weighted average yield(2)(3) — % — % — % 4.92 % 4.92 % CRT securities:(1) Amortized Cost $ — $ — $ — $ 14,713 $ 14,713 Estimated fair value — — — 11,417 11,417 Weighted average yield(3) — % — % — % 0.15 % 0.15 % Total available-for-sale debt securities: Amortized cost $ 3,143,171 Estimated fair value $ 3,163,138 (1) Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. (2) Yields have been adjusted to a tax equivalent basis assuming a 21% federal tax rate. (3) Yields are calculated based on amortized cost. The following table discloses our available-for-sale debt securities that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 or more months: Less Than 12 Months 12 Months or Longer Total (in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss March 31, 2021 U.S. government agency securities $ 119,840 $ (5,160) $ — $ — $ 119,840 $ (5,160) Residential mortgage-backed securities 3,067,739 (71,396) — — 3,067,739 (71,396) CRT securities — — 11,465 (3,248) 11,465 (3,248) Total $ 3,187,579 $ (76,556) $ 11,465 $ (3,248) $ 3,199,044 $ (79,804) December 31, 2020 U.S. government agency securities $ 98,588 $ (1,412) $ — $ — $ 98,588 $ (1,412) Residential mortgage-backed securities 354,387 (1,128) — — 354,387 (1,128) CRT securities — — 11,417 (3,296) 11,417 (3,296) Total $ 452,975 $ (2,540) $ 11,417 $ (3,296) $ 464,392 $ (5,836) At March 31, 2021, we had 108 securities in an unrealized loss position, comprised of 5 U.S. government agency securities, 2 CRT securities and 101 residential mortgage-backed securities. Based upon our March 31, 2021 review of securities with unrealized losses we have determined that all losses resulted from factors not deemed credit-related. We have evaluated the near-term prospects of each securities portfolio in relation to the severity of the unrealized losses and adverse conditions related to the securities among other factors. Based on that evaluation management has determined that we have the ability and intent to hold the securities until recovery of fair value and have recorded the unrealized losses in accumulated other comprehensive income ("AOCI"). Available-for-sale debt securities with carrying values of approximately $28.1 million and $1.6 million were pledged to secure certain customer repurchase agreements and deposits, respectively, at March 31, 2021. The comparative amounts at December 31, 2020 were $31.7 million and $1.9 million, respectively. Equity Securities Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. At March 31, 2021 and December 31, 2020, we had $34.4 million and $33.8 million, respectively, in equity securities recorded at fair value. The following is a summary of unrealized and realized gains/(losses) recognized on equity securities included in other non-interest income in the consolidated statements of income and other comprehensive income: Three months ended March 31, (in thousands) 2021 2020 Net gains/(losses) recognized during the period $ 378 $ (2,977) Less: Realized net gains/(losses) recognized during the period on equity securities sold 398 (19) Unrealized net gains/(losses) recognized during the period on equity securities still held $ (20) $ (2,958)

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table presents the computation of basic and diluted earnings per share: Three months ended March 31, (in thousands except share and per share data) 2021 2020 Numerator: Net income/(loss) $ 71,938 $ (16,687) Preferred stock dividends 3,779 2,438 Net income/(loss) available to common stockholders $ 68,159 $ (19,125) Denominator: Denominator for basic earnings per share—weighted average shares 50,513,277 50,373,580 Effect of employee stock-based awards(1) 556,234 101,222 Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions 51,069,511 50,474,802 Basic earnings/(loss) per common share $ 1.35 $ (0.38) Diluted earnings/(loss) per common share $ 1.33 $ (0.38) (1) SARs and RSUs outstanding of 80,263 at March 31, 2021 and 428,007 at March 31, 2020 have not been included in diluted earnings/(loss) per share because to do so would have been antidilutive for the periods presented.

Loans Held for Investment and A

Loans Held for Investment and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans Held for Investment and Allowance for Loan Losses	Loans Held for Investment and Allowance for Credit Losses on Loans Loans held for investment are summarized by portfolio segment as follows: (in thousands) March 31, 2021 December 31, 2020 Commercial $ 8,969,224 $ 8,861,580 Energy 691,806 766,217 Mortgage finance(1) 9,009,081 9,079,409 Real estate 5,810,590 5,794,624 Gross loans held for investment(2) 24,480,701 24,501,830 Unearned income (net of direct origination costs) (72,446) (70,970) Allowance for credit losses on loans (242,484) (254,615) Total loans held for investment, net(2) $ 24,165,771 $ 24,176,245 (1) Balances at March 31, 2021 and December 31, 2020 are stated net of $1.0 billion and $1.2 billion of participations sold, respectively. (2) Excludes accrued interest receivable of $55.9 million and $56.5 million at March 31, 2021 and December 31, 2020, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets. The following table summarizes our gross loans held for investment by year of origination and internally assigned credit grades: (in thousands) 2021 2020 2019 2018 2017 2016 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total March 31, 2021 Commercial (1-7) Pass $ 341,043 $ 3,548,075 $ 602,736 $ 462,947 $ 290,409 $ 318,287 $ 2,989,607 $ 44,992 $ 8,598,096 (8) Special mention — 4,120 87,653 47,936 19,139 7,276 10,194 12,734 189,052 (9) Substandard - accruing 17,850 1,903 27,269 28,182 10,464 26,775 23,804 7,635 143,882 (9+) Non-accrual — 7,135 3,254 1,037 5,971 12,912 7,218 667 38,194 Total commercial $ 358,893 $ 3,561,233 $ 720,912 $ 540,102 $ 325,983 $ 365,250 $ 3,030,823 $ 66,028 $ 8,969,224 Energy (1-7) Pass $ 15,515 $ — $ — $ 4,844 $ 8,893 $ 29,279 $ 515,359 $ — $ 573,890 (8) Special mention — — — — — 10,664 53,299 — 63,963 (9) Substandard - accruing — — — — — — 24,585 — 24,585 (9+) Non-accrual 10,036 — 8,153 — — 11,179 — — 29,368 Total energy $ 25,551 $ — $ 8,153 $ 4,844 $ 8,893 $ 51,122 $ 593,243 $ — $ 691,806 Mortgage finance (1-7) Pass $ 14,962 $ 716,845 $ 951,866 $ 799,447 $ 455,911 $ 6,070,050 $ — $ — $ 9,009,081 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 14,962 $ 716,845 $ 951,866 $ 799,447 $ 455,911 $ 6,070,050 $ — $ — $ 9,009,081 Real estate CRE (1-7) Pass $ 60,652 $ 418,403 $ 935,071 $ 862,447 $ 370,347 $ 554,723 $ 50,041 $ 60,805 $ 3,312,489 (8) Special mention — 3,475 15,071 34,642 48,234 59,183 — — 160,605 (9) Substandard - accruing — — 318 47,240 53,504 92,750 — 15,390 209,202 (9+) Non-accrual — — — 458 — 4,991 — 1,247 6,696 RBF (1-7) Pass 54,499 164,712 38,505 28,451 1,538 15,351 592,624 — 895,680 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 26,932 195,760 149,874 108,258 101,509 183,679 17,412 32,983 816,407 (8) Special mention — — 6,650 48 — 8,686 — 1,018 16,402 (9) Substandard - accruing — — — 4,228 14,354 16,238 — — 34,820 (9+) Non-accrual — — — — 908 8,057 — 14,289 23,254 Secured by 1-4 family (1-7) Pass 19,857 64,953 61,951 40,974 47,903 89,788 4,535 — 329,961 (8) Special mention — — — — — 1,770 — — 1,770 (9) Substandard - accruing — — — — 818 2,268 — — 3,086 (9+) Non-accrual — — — — — 218 — — 218 Total real estate $ 161,940 $ 847,303 $ 1,207,440 $ 1,126,746 $ 639,115 $ 1,037,702 $ 664,612 $ 125,732 $ 5,810,590 Total loans held for investment $ 561,346 $ 5,125,381 $ 2,888,371 $ 2,471,139 $ 1,429,902 $ 7,524,124 $ 4,288,678 $ 191,760 $ 24,480,701 The following table details activity in the allowance for credit losses on loans. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Energy Mortgage Real Total Three months ended March 31, 2021 Allowance for credit losses on loans: Beginning balance $ 73,061 $ 84,064 $ 4,699 $ 92,791 $ 254,615 Provision for credit losses on loans (1,001) (5,852) 211 929 (5,713) Charge-offs 2,451 5,732 — — 8,183 Recoveries 1,050 715 — — 1,765 Net charge-offs (recoveries) 1,401 5,017 — — 6,418 Ending balance $ 70,659 $ 73,195 $ 4,910 $ 93,720 $ 242,484 Three months ended March 31, 2020 Allowance for credit losses on loans: Beginning balance $ 102,254 $ 60,253 $ 2,265 $ 30,275 $ 195,047 Impact of Current Expected Credit Loss ("CECL") adoption (15,740) 24,154 2,031 (1,860) 8,585 Provision for credit losses on loans 24,902 66,821 35 3,271 95,029 Charge-offs 20,653 37,730 — — 58,383 Recoveries 257 423 — — 680 Net charge-offs (recoveries) 20,396 37,307 — — 57,703 Ending balance $ 91,020 $ 113,921 $ 4,331 $ 31,686 $ 240,958 A loan is considered collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. The following table summarizes collateral-dependent gross loans held for investment by collateral type as follows: Collateral Type (in thousands) Real Property Rolling Stock Total March 31, 2021 Commercial $ — $ 774 $ 774 Real estate CRE 4,619 — 4,619 Other 5,984 — 5,984 Total collateral-dependent loans held for investment $ 10,603 $ 774 $ 11,377 The table below provides an age analysis of our loans held for investment: (in thousands) 30-59 Days 60-89 Days 90 Days or More Past Due(1) Total Past Non-accrual loans as of March 31, 2021 (2) Current Total Non-accrual With No Allowance March 31, 2021 Commercial $ 15,563 $ 2,905 $ 3,885 $ 22,353 $ 38,194 $ 8,908,677 $ 8,969,224 $ 15,860 Energy — — — — 29,368 662,438 691,806 18,189 Mortgage finance loans — — — — — 9,009,081 9,009,081 — Real estate CRE 14,939 — 2,238 17,177 6,696 3,665,119 3,688,992 1,849 RBF — — — — — 895,680 895,680 — Other 105 — — 105 23,254 867,524 890,883 7,864 Secured by 1-4 family 55 — 64 119 218 334,698 335,035 — Total loans held for investment $ 30,662 $ 2,905 $ 6,187 $ 39,754 $ 97,730 $ 24,343,217 $ 24,480,701 $ 43,762 (1) Loans past due 90 days and still accruing includes premium finance loans of $3.1 million. These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The receipt of the refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date. (2) As of March 31, 2021 and December 31, 2020, none of our non-accrual loans were earning interest income on a cash basis. Additionally, no interest income was recognized on non-accrual loans for the three months ended March 31, 2021. Accrued interest of $339,000 was reversed during the three months ended March 31, 2021. As of March 31, 2021 and December 31, 2020, we did not have any loans considered restructured that were not on non-accrual. Of the non-accrual loans at March 31, 2021 and December 31, 2020, $33.7 million and $45.4 million, respectively, met the criteria for restructured. These loans had no unfunded commitments at their respective balance sheet dates. We did not have any loans that were restructured during the three months ended March 31, 2021 or 2020. As of March 31, 2021 and 2020, we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

Certain Transfers of Financial

Certain Transfers of Financial Assets	3 Months Ended
	Mar. 31, 2021
Transfers and Servicing [Abstract]
Certain Transfers of Financial Assets	Certain Transfers of Financial Assets The table below presents a reconciliation of the changes in loans held for sale: Three Months Ended March 31, (in thousands) 2021 2020 Outstanding balance(1): Beginning balance $ 281,137 $ 2,568,362 Loans purchased and originated 1,133,239 2,356,710 Payments and loans sold (1,236,738) (4,165,492) Ending balance 177,638 759,580 Fair value adjustment: Beginning balance 2,028 8,772 Increase/(decrease) to fair value (3,380) 5,712 Ending balance (1,352) 14,484 Loans held for sale at fair value $ 176,286 $ 774,064 (1) Includes $44.1 million of loans held for sale that are carried at lower of cost or market as of December 31, 2020, as well as $5.8 million as of December 31, 2019. No loans held for sale were on non-accrual as of March 31, 2021. At December 31, 2020 we had $7.0 million in non-accrual loans held for sale, comprised of one loan previously reported in loans held for investment that was transferred to loans held for sale as of December 31, 2020 and subsequently sold at carrying value. At March 31, 2021 and December 31, 2020, we had $16.4 million and $16.7 million, respectively, of loans held for sale that were 90 days or more past due. The $16.4 million in loans held for sale that were 90 days or more past due at March 31, 2021 included $3.3 million of loans guaranteed by U.S. government agencies that were purchased out of Ginnie Mae securities and recorded as loans held for sale, at fair value, on the balance sheet. Interest on these past due loans accrues at the debenture rate guaranteed by the U.S. government. Also included in the $16.4 million were $12.9 million in loans that, pursuant to Ginnie Mae servicing guidelines, we have the unilateral right, but not the obligation, to repurchase if defined delinquent loan criteria are met, and therefore must record as held for sale on our balance sheet regardless of whether the repurchase option has been exercised. At December 31, 2020, $3.3 million of the $16.7 million in loans held for sale that were 90 days or more past due were loans guaranteed by U.S. government agencies that were purchased out of Ginnie Mae securities and recorded as loans held for sale, at fair value, on the balance sheet and $13.4 million were loans that we have the unilateral right, but not the obligation, to repurchase if defined delinquent loan criteria are met. From time to time we retain the right to service the loans sold through our MCA program, creating MSRs which are recorded as assets on our consolidated balance sheets. A summary of MSR activity is as follows: Three months ended March 31, (in thousands) 2021 2020 MSRs: Balance, beginning of year $ 131,391 $ 70,707 Capitalized servicing rights 11,867 20,615 Amortization (12,643) (4,885) Balance, end of period $ 130,615 $ 86,437 Valuation allowance: Balance, beginning of year $ 25,967 $ 5,803 Change in valuation allowance (16,448) 10,015 Balance, end of period $ 9,519 $ 15,818 MSRs, net $ 121,096 $ 70,619 MSRs, fair value $ 132,580 $ 70,619 At March 31, 2021 and December 31, 2020, our servicing portfolio of residential mortgage loans had outstanding principal balances of $13.6 billion and $13.8 billion, respectively. In connection with the servicing of these loans, we hold deposits in the name of investors representing escrow funds for taxes and insurance, as well as collections in transit to the investors. These escrow funds are segregated and held in separate non-interest-bearing deposit accounts at the Bank. These deposits, included in total non-interest-bearing deposits on the consolidated balance sheets, were $153.8 million at March 31, 2021 and $152.6 million at December 31, 2020. At March 31, 2021, the estimated fair value of MSRs were positively impacted by decreased prepayment speeds as compared to December 31, 2020, which resulted in a $16.4 million release of impairment being recorded for the three months ended March 31, 2021, compared to a $10.0 million impairment charge for the first three months of 2020. To mitigate exposure to potential impairment charges from adverse changes in the fair value of our residential MSR portfolio, we enter into certain derivative contracts, as is further discussed in Note 11 - Derivative Financial Instruments. The following summarizes the assumptions used by management to determine the fair value of MSRs: March 31, 2021 December 31, 2020 Average discount rates 9.08 % 9.09 % Expected prepayment speeds 12.10 % 16.37 % Weighted-average life, in years 6.3 4.9 A sensitivity analysis of changes in the fair value of our MSR portfolio resulting from certain key assumptions is presented in the following table: (in thousands) March 31, 2021 December 31, 2020 50 bp adverse change in prepayment speed $ (15,593) $ (12,203) 100 bp adverse change in prepayment speed (27,503) (16,062) These sensitivities are hypothetical and actual results may differ materially due to a number of factors. The effect on fair value of a 10% variation in assumptions generally cannot be determined with confidence because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair value is calculated while holding other assumptions constant. In reality, changes in one factor may be correlated with changes in other factors, which could impact the sensitivity analysis as presented. In conjunction with the sale and securitization of loans held for sale, we may be exposed to liability resulting from repurchase, indemnification and make-whole agreements. Our estimated exposure related to those agreements totaled $648,000 and $621,000 at March 31, 2021 and December 31, 2020, respectively, and is recorded in other liabilities on the consolidated balance sheets. $30,000 in make-whole obligation payments were made during the three months ended March 31, 2021 compared to $2.1 million during the three months ended March 31, 2020.

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2021
Subordinated Borrowings [Abstract]
Long-Term Debt	Long-term Debt From November 2002 to September 2006 various Texas Capital Statutory Trusts were created and subsequently issued floating rate trust preferred securities in various private offerings totaling $113.4 million. For the three months ended March 31, 2021, the combined weighted-average interest rate on the trust preferred subordinated debentures was 2.19% compared to 3.80% for the same period in 2020. As of December 31, 2020, the details of the trust preferred subordinated debentures are summarized below: (dollar amounts in thousands) Texas Capital Texas Capital Texas Capital Texas Capital Texas Capital Date issued November 19, 2002 April 10, 2003 October 6, 2005 April 28, 2006 September 29, 2006 Trust preferred securities issued $10,310 $10,310 $25,774 $25,774 $41,238 Floating or fixed rate securities Floating Floating Floating Floating Floating Interest rate on subordinated debentures 3 month LIBOR + 3.35% 3 month LIBOR + 3.25% 3 month LIBOR + 1.51% 3 month LIBOR + 1.60% 3 month LIBOR + 1.71% Maturity date November 2032 April 2033 December 2035 June 2036 December 2036 On September 21, 2012, the Company issued $111.0 million of subordinated notes. The notes mature in September 2042 and bear interest at a rate of 6.50% per annum, payable quarterly. The indenture governing the notes contains customary covenants and restrictions. On January 31, 2014, the Bank issued $175.0 million of subordinated notes in an offering to institutional investors exempt from registration under Section 3(a)(2) of the Securities Act of 1933 and 12 C.F.R. Part 16. The notes mature in January 2026 and bear interest at a rate of 5.25% per annum, payable semi-annually. The notes are unsecured and are subordinate to the Bank’s obligations to its depositors, its obligations under banker’s acceptances and letters of credit, certain obligations to Federal Reserve Banks and the FDIC and the Bank’s obligations to its other creditors, except any obligations which expressly rank on a parity with or junior to the notes. The notes qualify as Tier 2 capital for regulatory capital purposes, subject to applicable limitations. At the beginning of each of the last five years of the life of the notes, the amount that is eligible to be included in Tier 2 capital is reduced by 20% of the original amount of the notes (net of redemptions). In 2021, the amount of the notes that qualify as Tier 2 capital has been reduced by 20%. On March 9, 2021, the Bank issued and sold $275 million of senior unsecured credit-linked notes. The notes mature on September 30, 2024, and accrue interest at a rate equal to the higher of LIBOR plus 4.50% or 4.25%, payable quarterly on each of March 31, June 30, September 30 and December 31. For the three months ended March 31, 2021, the weighted-average interest rate on the notes was 5.54%. The notes effectively transfer the risk of first losses on a $2.2 billion reference pool of the Bank’s mortgage warehouse loans to the purchasers of the notes in an amount up to $275.0 million. In the event of a failure to pay by the relevant mortgage originator, insolvency of the relevant mortgage originator, or restructuring of such loans that results in a loss on a loan included in the reference pool, the principal balance of the notes will be reduced to the extent of such loss and recognized as a debt extinguishment gain within non-interest income on our consolidated statements of income and other comprehensive income. The purchasers of the notes have the option to acquire the underlying mortgage loan collateralizing the reference warehouse line of credit in lieu of a principal reduction on the notes. Losses on our warehouse lines of credit have not generally been significant. The notes are recorded in long-term debt on our consolidated balance sheets and accounted for at amortized cost. The fair value of the credit-linked note is based on observable inputs, when available, and as such are categorized as Level 2 liabilities. Because the notes are variable rate debt, the fair value approximates carrying value.

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	3 Months Ended
	Mar. 31, 2021
Risks and Uncertainties [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial Instruments with Off-Balance Sheet Risk The table below presents our financial instruments with off-balance sheet risk, as well as the activity in the allowance for off-balance sheet credit losses related to those financial instruments. This allowance is recorded in other liabilities on the consolidated balance sheets. Three months ended March 31, (in thousands) 2021 2020 Beginning balance of allowance for off-balance sheet credit losses $ 17,434 $ 8,640 Impact of CECL adoption — 563 Provision for off-balance sheet credit losses (287) 971 Ending balance of allowance for off-balance sheet credit losses $ 17,147 $ 10,174 (in thousands) March 31, 2021 December 31, 2020 Commitments to extend credit - period end balance $ 8,115,679 $ 8,530,453 Standby letters of credit - period end balance $ 321,428 $ 268,894

Regulatory Restrictions

Regulatory Restrictions	3 Months Ended
	Mar. 31, 2021
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Restrictions	Regulatory Restrictions The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. 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 adverse effect on the Company’s and the Bank’s 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 the Company’s and the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s and the Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. The Basel III regulatory capital framework (the "Basel III Capital Rules") adopted by U.S. federal regulatory authorities, among other things, (i) establishes the capital measure called "Common Equity Tier 1" ("CET1"), (ii) specifies that Tier 1 capital consist of CET1 and "Additional Tier 1 Capital" instruments meeting stated requirements, (iii) requires that most deductions/adjustments to regulatory capital measures be made to CET1 and not to other components of capital and (iv) defines the scope of the deductions/adjustments to the capital measures. Additionally, the Basel III Capital Rules require that we maintain a 2.5% capital conservation buffer with respect to each of CET1, Tier 1 and total capital to risk-weighted assets, which provides for capital levels that exceed the minimum risk-based capital adequacy requirements. A financial institution with a conservation buffer of less than the required amount is subject to limitations on capital distributions, including dividend payments and stock repurchases, and certain discretionary bonus payments to executive officers. In February 2019, the federal bank regulatory agencies issued a final rule (the "2019 CECL Rule") that revised certain capital regulations to account for changes to credit loss accounting under GAAP. The 2019 CECL Rule included a transition option that allows banking organizations to phase in, over a three-year period, the day-one adverse effects of adopting the new accounting standard related to the measurement of current expected credit losses on their regulatory capital ratios (three-year transition option). In March 2020, the federal bank regulatory agencies issued an interim final rule that maintains the three-year transition option of the 2019 CECL Rule and also provides banking organizations that were required under GAAP to implement CECL before the end of 2020 the option to delay for two years an estimate of the effect of CECL on regulatory capital, relative to the incurred loss methodology's effect on regulatory capital, followed by a three-year transition period (five-year transition option). We adopted CECL on January 1, 2020 and have elected to utilize the five-year transition option. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of CET1, Tier 1 and total capital to risk-weighted assets, and of Tier 1 capital to average assets, each as defined in the regulations. Management believes, as of March 31, 2021, that the Company and the Bank meet all capital adequacy requirements to which they are subject. Financial institutions are categorized as well capitalized or adequately capitalized, based on minimum total risk-based, Tier 1 risk-based, CET1 and Tier 1 leverage ratios. As shown in the table below, the Company’s capital ratios exceeded the regulatory definition of adequately capitalized as of March 31, 2021 and December 31, 2020. Based upon the information in its most recently filed call report, the Bank met the capital ratios necessary to be well capitalized. The regulatory authorities can apply changes in classification of assets and such changes may retroactively subject the Company to changes in capital ratios. Any such change could reduce one or more capital ratios below well-capitalized status. In addition, a change may result in imposition of additional assessments by the FDIC or could result in regulatory actions that could have a material effect on our condition and results of operations. Because our Bank had less than $15.0 billion in total consolidated assets as of December 31, 2009, we are allowed to continue to classify our trust preferred securities, all of which were issued prior to May 19, 2010, as Tier 1 capital. The table below summarizes our actual and required capital ratios under the Basel III Capital Rules. The ratios presented below include the effects of our election to utilize the five-year CECL transition described above. Actual Minimum Capital Required - Basel III Fully Phased-In Required to be Considered Well Capitalized (dollars in thousands) Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio March 31, 2021 CET1 Company $ 2,765,597 10.19 % $ 1,900,393 7.00 % N/A N/A Bank 2,818,155 10.39 % 1,899,299 7.00 % 1,763,635 6.50 % Total capital (to risk-weighted assets) Company 3,811,962 14.04 % 2,850,590 10.50 % N/A N/A Bank 3,405,679 12.55 % 2,848,948 10.50 % 2,713,284 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,325,597 12.25 % 2,307,621 8.50 % N/A N/A Bank 2,978,155 10.98 % 2,306,291 8.50 % 2,170,627 8.00 % Tier 1 capital (to average assets)(1) Company 3,325,597 8.32 % 1,598,426 4.00 % N/A N/A Bank 2,978,155 7.46 % 1,597,924 4.00 % 1,997,405 5.00 % December 31, 2020 CET1 Company $ 2,708,150 9.35 % $ 2,026,400 7.00 % N/A N/A Bank 2,744,211 9.48 % 2,025,417 7.00 % 1,880,745 6.50 % Total capital (to risk-weighted assets) Company 3,498,737 12.08 % 3,039,600 10.50 % N/A N/A Bank 3,375,983 11.67 % 3,038,126 10.50 % 2,893,453 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,968,150 10.25 % 2,460,628 8.50 % N/A N/A Bank 2,904,211 10.04 % 2,459,435 8.50 % 2,314,763 8.00 % Tier 1 capital (to average assets)(1) Company 2,968,150 7.52 % 1,578,651 4.00 % N/A N/A Bank 2,904,211 7.36 % 1,578,207 4.00 % 1,972,758 5.00 % (1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, the Federal Reserve Board and the FDIC may require the Company and the Bank, respectively, to maintain a Tier 1 capital ratio (to average assets) above the required minimum. Our mortgage finance loan volumes can increase significantly at month-end, causing a meaningful difference between ending balance and average balance for any period. As CET1, Tier 1 and total capital ratios are calculated using quarter-end risk-weighted assets and our mortgage finance loans are 100% risk-weighted (excluding MCA mortgage loans held for sale, which receive lower risk weights), the period-end fluctuation in these balances can significantly impact our reported ratios. Due to the actual risk profile and liquidity of this asset class, we do not believe that the period-end balance is representative of risk characteristics that would justify higher allocations, and while we manage capital allocated to mortgage finance loans based on changing trends in average balances, we do monitor our capital allocation to confirm that all capital levels remain above well-capitalized levels. To better align the actual risk profile of this asset class to its required capital allocation, the Bank issued and sold senior unsecured credit-linked notes in the first quarter of 2021 that effectively transfer the risk of first losses on a $2.2 billion reference pool of the Bank's mortgage warehouse loans to the purchasers of the notes in an amount up to $275.0 million. The issuance of these notes decreases the required risk-weight on the $2.2 billion reference pool, which significantly improves our reported ratios. Dividends that may be paid by banks are routinely restricted by various regulatory authorities. The amount that can be paid in any calendar year without prior approval of our Bank’s regulatory agencies cannot exceed the lesser of the net profits (as defined) for that year plus the net profits for the preceding two calendar years, or retained earnings. The Basel III Capital Rules further limit the amount of dividends that may be paid by our Bank. No dividends were declared or paid on our common stock during the three months ended March 31, 2021, or 2020.

Stock-based Compensation

Stock-based Compensation	3 Months Ended
	Mar. 31, 2021
Compensation Related Costs [Abstract]
Stock-based Compensation	Stock-based Compensation We have long-term incentive plans under which stock-based compensation awards are granted to employees and directors by the board of directors, or its designated committee. Grants are subject to vesting requirements and may include, among other things, nonqualified stock options, stock appreciation rights ("SARs"), restricted stock units ("RSUs"), restricted stock and performance units, or any combination thereof. There are 2,550,000 total shares authorized for grant under the plans. The table below summarizes our stock-based compensation expense: Three months ended March 31, (in thousands) 2021 2020 Stock-settled awards: RSUs $ 5,460 $ 3,219 Restricted stock 1 8 Cash-settled units 907 142 Total $ 6,368 $ 3,369 (in thousands except period data) March 31, 2021 Unrecognized compensation expense related to unvested stock-settled awards $ 52,268 Weighted average period over which expense is expected to be recognized, in years 2.4

Fair Value Disclosures

Fair Value Disclosures	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures We determine the fair market values of our assets and liabilities measured at fair value on a recurring and nonrecurring basis using the fair value hierarchy as prescribed in ASC 820. See Note 1 - Operations and Summary of Significant Accounting Policies in our 2020 Form 10-K for information regarding the fair value hierarchy and a description of the methods and significant assumptions used by the Company in estimating its fair value disclosures for financial instruments. Assets and liabilities measured at fair value are as follows: Fair Value Measurements Using (in thousands) Level 1 Level 2 Level 3 March 31, 2021 Available-for-sale debt securities:(1) U.S. government agency securities $ — $ 119,840 $ — Residential mortgage-backed securities — 3,095,787 — Tax-exempt asset-backed securities — — 181,566 CRT securities — — 11,465 Equity securities(1)(2) 27,261 7,139 — Loans held for sale(3) — 169,011 7,275 Loans held for investment(4) — — 9,122 Derivative assets(5) — 70,387 — Derivative liabilities(5) — 69,283 — Non-qualified deferred compensation plan liabilities(6) 27,351 — — December 31, 2020 Available-for-sale debt securities:(1) U.S. government agency securities $ — $ 123,589 $ — Residential mortgage-backed securities — 2,828,956 — Tax-exempt asset-backed securities — — 199,176 CRT securities — — 11,417 Equity securities(1)(2) 26,593 7,239 — Loans held for sale(3) — 232,147 6,933 Loans held for investment(4) — — 21,209 Derivative assets(5) — 102,720 — Derivative liabilities(5) — 99,255 — Non-qualified deferred compensation plan liabilities(6) 26,593 — — (1) Securities are measured at fair value on a recurring basis, generally monthly, except for tax-exempt asset-backed securities and CRT securities which are measured quarterly. (2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. (3) Loans held for sale purchased through our MCA program are measured at fair value on a recurring basis, generally monthly. (4) Includes certain collateral-dependent loans held for investment for which a specific allocation of the allowance for credit losses is based upon the fair value of the loan’s underlying collateral. These loans held for investment are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions. (5) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly. (6) Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which generally corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly. Level 3 Valuations The following table presents a reconciliation of the level 3 fair value category measured at fair value on a recurring basis: Net Realized/Unrealized Gains (Losses) (in thousands) Balance at Beginning of Period Purchases / Additions Sales / Reductions Realized Unrealized Balance at End of Period Three months ended March 31, 2021 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 199,176 $ — $ (11,371) $ — $ (6,239) $ 181,566 CRT securities 11,417 — — — 48 11,465 Loans held for sale(2) 6,933 537 (279) 5 79 7,275 Three months ended March 31, 2020 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 197,027 $ — $ (4,353) $ — $ (1,200) $ 191,474 CRT securities 11,964 — — — (3,949) 8,015 Loans held for sale(2) 7,043 213 (684) 28 94 6,694 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI and relate to assets that remain outstanding at period end. Realized gains/(losses) are recorded in other non-interest income. (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in gain/(loss) on sale of loans held for sale. Tax-exempt asset-backed securities The fair value of tax-exempt asset-backed securities is based on a discounted cash flow model, which utilizes Level 3, or unobservable, inputs, the most significant of which were a discount rate and weighted-average life. At March 31, 2021, the discount rates utilized ranged from 2.95% to 3.03% and the weighted-average life ranged from 5.28 years to 5.30 years. On a combined amortized cost weighted-average basis a discount rate of 2.99% and weighted-average life of 5.29 years were utilized to determine the fair value of these securities at March 31, 2021. At December 31, 2020, the combined weighted-average discount rate and weighted-average life utilized were 2.49% and 5.53 years, respectively. CRT securities The fair value of CRT securities is based on a discounted cash flow model, which utilizes Level 3, or unobservable, inputs, the most significant of which were a discount rate and weighted-average life. At March 31, 2021, the discount rates utilized ranged from 3.32% to 8.27% and the weighted-average life ranged from 6.4 years to 10.3 years. On a combined amortized cost weighted-average basis a discount rate of 4.97% and a weighted-average life of 7.7 years were utilized to determine the fair value of these securities at March 31, 2021. At December 31, 2020, the combined weighted-average discount rate and combined weighted-average life utilized were 4.36% and 7.49 years, respectively. Loans held for sale The fair value of loans held for sale using Level 3 inputs include loans that cannot be sold through normal sale channels and thus require significant management judgment or estimation when determining the fair value. The fair value of such loans is generally based upon quoted prices of comparable loans with a liquidity discount applied. At March 31, 2021, the fair value of these loans was calculated using a weighted-average discounted price of 98.4%, compared to 97.2% at December 31, 2020. Loans held for investment Certain collateral-dependent loans held for investment are reported at fair value when, based upon an individual evaluation, the specific allocation of the allowance for credit losses that is deducted from the loan's amortized cost is based upon the fair value of the loan's underlying collateral. The $9.1 million fair value of loans held for investment at March 31, 2021 reported above includes loans held for investment with a carrying value of $11.4 million that were reduced by specific allowance allocations totaling $2.3 million based on collateral valuations utilizing Level 3 inputs. The $21.2 million fair value of loans held for investment at December 31, 2020 reported above includes loans with a carrying value of $25.3 million that were reduced by specific allowance allocations totaling $4.1 million based on collateral valuations utilizing Level 3 inputs. Fair Value of Financial Instruments A summary of the carrying amounts and estimated fair values of financial instruments is as follows: March 31, 2021 December 31, 2020 (in thousands) Carrying Estimated Carrying Estimated Financial assets: Level 1 inputs: Cash and cash equivalents $ 11,428,111 $ 11,428,111 $ 9,206,380 $ 9,206,380 Investment securities 27,261 27,261 26,593 26,593 Level 2 inputs: Investment securities 3,222,766 3,222,766 2,959,784 2,959,784 Loans held for sale 169,011 169,011 232,147 232,147 Derivative assets 70,387 70,387 102,720 102,720 Level 3 inputs: Investment securities 193,031 193,031 210,593 210,593 Loans held for sale 7,275 7,275 6,933 6,933 Loans held for investment, net 24,165,771 24,217,032 24,176,245 24,233,185 Financial liabilities: Level 2 inputs: Federal funds purchased and repurchase agreements 115,587 115,587 111,751 111,751 Other borrowings 2,400,000 2,400,000 3,000,000 3,000,000 Long-term debt 664,968 672,996 395,896 405,110 Derivative liabilities 69,283 69,283 99,255 99,255 Level 3 inputs: Deposits 33,391,970 33,392,592 30,996,589 30,997,980

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The notional amounts and estimated fair values of derivative positions outstanding are presented in the following table: March 31, 2021 December 31, 2020 Estimated Fair Value Estimated Fair Value (in thousands) Notional Asset Derivative Liability Derivative Notional Asset Derivative Liability Derivative Non-hedging derivatives: Financial institution counterparties: Commercial loan/lease interest rate swaps $ 1,826,115 $ 2,387 $ 66,363 $ 1,922,956 $ 71 $ 96,246 Commercial loan/lease interest rate caps 655,917 88 — 565,634 34 — Foreign currency forward contracts 6,664 96 18 6,667 214 78 Customer counterparties: Commercial loan/lease interest rate swaps 1,826,115 66,363 2,387 1,922,956 96,246 71 Commercial loan/lease interest rate caps 655,917 — 88 565,634 — 34 Foreign currency forward contracts 6,664 18 96 6,667 78 214 Economic hedging derivatives to hedge: Residential MSRs: Interest rate swap futures 170,000 — 954 320,000 474 — Forward sale commitments 75,000 77 615 155,000 551 — Loans held for sale: Loan purchase commitments 198,072 531 1,149 332,145 5,123 8 Forward sale commitments 342,218 3,214 — 485,326 — 2,675 Gross derivatives 72,774 71,670 102,791 99,326 Offsetting derivative assets/liabilities (2,387) (2,387) (71) (71) Net derivatives included in the consolidated balance sheets $ 70,387 $ 69,283 $ 102,720 $ 99,255 The weighted-average received and paid interest rates for interest rate swaps outstanding were as follows: March 31, 2021 December 31, 2020 Weighted-Average Interest Rate Received Paid Received Paid Non-hedging interest rate swaps 2.99 % 1.27 % 3.14 % 1.38 % The weighted-average strike rate for outstanding interest rate caps was 3.07% at March 31, 2021 and 3.41% at December 31, 2020. Our credit exposure on derivative instruments is limited to the net favorable value and interest payments by each counterparty. In some cases collateral may be required from the counterparties involved if the net value of the derivative instruments exceeds a nominal amount. Our credit exposure associated with these instruments, net of any collateral pledged, was approximately $70.4 million at March 31, 2021, and approximately $102.7 million at December 31, 2020. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap and cap values, as well as for changes in the value of forward sale commitments. At March 31, 2021, we had $74.5 million in cash collateral pledged for these derivatives, of which $73.5 million was included in interest-bearing deposits in other banks and $1.0 million was included in accrued interest receivable and other assets. At December 31, 2020, we had $108.3 million in cash collateral pledged for these derivatives, of which $104.4 million was included in interest-bearing deposits in other banks and $3.9 million was included in accrued interest receivable and other assets. We also enter into credit risk participation agreements with financial institution counterparties for interest rate swaps related to loans in which we are either a participant or a lead bank. The risk participation agreements entered into by us as a participant bank provide credit protection to the financial institution counterparty should the borrower fail to perform on its interest rate derivative contract with that financial institution. We are party to 9 risk participation agreements where we are a participant bank with a notional amount of $119.0 million at March 31, 2021, compared to 9 risk participation agreements having a notional amount of $119.5 million at December 31, 2020. The maximum estimated exposure to these agreements, assuming 100% default by all obligors, was approximately $4.9 million at March 31, 2021 and $6.0 million at December 31, 2020. The fair value of these exposures was insignificant to the consolidated financial statements at both March 31, 2021 and December 31, 2020. Risk participation agreements entered into by us as the lead bank provide credit protection to us should the borrower fail to perform on its interest rate derivative contract with us. We are party to 15 risk participation agreements where

Material Transactions Affecting

Material Transactions Affecting Stockholders' Equity	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
Material Transactions Affecting Stockholders' Equity	Material Transactions Affecting Stockholders' EquityOn March 3, 2021, we completed an issuance of 5.75% fixed rate non-cumulative perpetual preferred stock, Series B, with a liquidation preference of $1,000 per share (equivalent to $25 per depositary share) (the "Series B Preferred Stock") and an issuance and sale of 12,000,000 depositary shares, each representing a 1/40th interest in a share of the Series B Preferred Stock. Dividends on the Series B Preferred Stock are not cumulative and will be paid when declared by our board of directors to the extent that we have legally available funds to pay dividends. If declared, dividends will accrue and be payable quarterly, in arrears, on the liquidation preference amount, on a non-cumulative basis, at a rate of 5.75% per annum. Holders of preferred stock will not have voting rights, except with respect to certain changes in the terms of the preferred stock, certain dividend non-payments and as otherwise required by applicable law. Net proceeds from the sale totaled $289.7 million. The additional equity is being used for general corporate purposes, including funding regulatory capital infusions into the Bank, and may be used to redeem, in whole or in part and subject to receipt of all applicable regulatory approvals, our 6.5% non-cumulative perpetual preferred stock Series A, par value $0.01 per share, in accordance with its terms.

Operations and Summary of Sig_2

Operations and Summary of Significant Accounting Policies Operations and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization And Nature Of Business	Organization and Nature of Business Texas Capital Bancshares, Inc. (the "Company” or "TCBI"), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the "Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional or national clientele of commercial borrowers. We are primarily a secured lender, with the majority of our loans held for investment, excluding mortgage finance loans and other national lines of business, being made to businesses headquartered or with operations in Texas. Our national lines of business provide specialized lending products to businesses throughout the United States.
Basis of Accounting	Basis of Presentation Our accounting and reporting policies conform to accounting principles generally accepted in the United States ("GAAP") and to generally accepted practices within the banking industry. Certain prior period balances have been reclassified to conform to the current period presentation. The consolidated interim financial statements are unaudited and certain information and footnote disclosures presented in accordance with GAAP have been condensed or omitted. In the opinion of management, the interim financial statements include all normal and recurring adjustments and the disclosures made are adequate to make the interim financial information not misleading. The consolidated financial statements have been prepared in accordance with GAAP for interim financial information and the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2020, included in our Annual Report on Form 10-K for the year ended December 31, 2020 (the "2020 Form 10-K"). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period.
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. Actual results could differ from those estimates. The allowance for credit losses, the fair value of financial instruments and the status of contingencies are particularly susceptible to significant change.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Summary of securities	The following is a summary of available-for-sale debt securities: (in thousands) Amortized Gross Gross Estimated March 31, 2021 Available-for-sale debt securities: U.S. government agency securities $ 125,000 $ — $ (5,160) $ 119,840 Residential mortgage-backed securities 3,166,816 367 (71,396) 3,095,787 Tax-exempt asset-backed securities 173,569 7,997 — 181,566 Credit risk transfer securities 14,713 — (3,248) 11,465 Total $ 3,480,098 $ 8,364 $ (79,804) $ 3,408,658 December 31, 2020 Available-for-sale debt securities: U.S. government agency securities $ 125,000 $ 1 $ (1,412) $ 123,589 Residential mortgage-backed securities 2,818,518 11,566 (1,128) 2,828,956 Tax-exempt asset-backed securities 184,940 14,236 — 199,176 Credit risk transfer securities 14,713 — (3,296) 11,417 Total $ 3,143,171 $ 25,803 $ (5,836) $ 3,163,138 (1) Excludes accrued interest receivable of $6.3 million and $6.0 million at March 31, 2021 and December 31, 2020, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets.
Schedule of amortized cost and estimated fair value of securities	The amortized cost and estimated fair value, excluding accrued interest receivable, and weighted average yield of available-for-sale debt securities are presented below by contractual maturity: (in thousands, except percentage data) Less Than After One After Five After Ten Total March 31, 2021 Available-for-sale: U.S. government agency securities:(1) Amortized cost $ — $ — $ 125,000 $ — $ 125,000 Estimated fair value — — 119,840 — 119,840 Weighted average yield(3) — % — % 1.13 % — % 1.13 % Residential mortgage-backed securities:(1) Amortized cost $ — $ 449 $ 17,368 $ 3,148,999 $ 3,166,816 Estimated fair value — 499 16,442 3,078,846 3,095,787 Weighted average yield(3) — % 4.59 % 1.08 % 1.16 % 1.16 % Tax-exempt asset-backed securities:(1) Amortized Cost $ — $ — $ — $ 173,569 $ 173,569 Estimated fair value — — — 181,566 181,566 Weighted average yield(2)(3) — % — % — % 4.95 % 4.95 % CRT securities:(1) Amortized Cost $ — $ — $ — $ 14,713 $ 14,713 Estimated fair value — — — 11,465 11,465 Weighted average yield(3) — % — % — % 0.11 % 0.11 % Total available-for-sale debt securities: Amortized cost $ 3,480,098 Estimated fair value $ 3,408,658 December 31, 2020 Available-for-sale: U.S. government agency securities:(1) Amortized cost $ — $ — $ 125,000 $ — $ 125,000 Estimated fair value — — 123,589 — 123,589 Weighted average yield(3) — % — % 1.13 % — % 1.13 % Residential mortgage-backed securities:(1) Amortized cost $ — $ 545 $ 17,500 $ 2,800,473 $ 2,818,518 Estimated fair value — 605 17,490 2,810,861 2,828,956 Weighted average yield(3) — % 4.58 % 1.08 % 1.25 % 1.25 % Tax-exempt asset-backed securities:(1) Amortized Cost $ — $ — $ — $ 184,940 $ 184,940 Estimated fair value — — — 199,176 199,176 Weighted average yield(2)(3) — % — % — % 4.92 % 4.92 % CRT securities:(1) Amortized Cost $ — $ — $ — $ 14,713 $ 14,713 Estimated fair value — — — 11,417 11,417 Weighted average yield(3) — % — % — % 0.15 % 0.15 % Total available-for-sale debt securities: Amortized cost $ 3,143,171 Estimated fair value $ 3,163,138 (1) Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. (2) Yields have been adjusted to a tax equivalent basis assuming a 21% federal tax rate. (3) Yields are calculated based on amortized cost.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	The following table discloses our available-for-sale debt securities that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 or more months: Less Than 12 Months 12 Months or Longer Total (in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss March 31, 2021 U.S. government agency securities $ 119,840 $ (5,160) $ — $ — $ 119,840 $ (5,160) Residential mortgage-backed securities 3,067,739 (71,396) — — 3,067,739 (71,396) CRT securities — — 11,465 (3,248) 11,465 (3,248) Total $ 3,187,579 $ (76,556) $ 11,465 $ (3,248) $ 3,199,044 $ (79,804) December 31, 2020 U.S. government agency securities $ 98,588 $ (1,412) $ — $ — $ 98,588 $ (1,412) Residential mortgage-backed securities 354,387 (1,128) — — 354,387 (1,128) CRT securities — — 11,417 (3,296) 11,417 (3,296) Total $ 452,975 $ (2,540) $ 11,417 $ (3,296) $ 464,392 $ (5,836)
Summary of unrealized and realized gains/(losses) recognized in net income on equity securities	The following is a summary of unrealized and realized gains/(losses) recognized on equity securities included in other non-interest income in the consolidated statements of income and other comprehensive income: Three months ended March 31, (in thousands) 2021 2020 Net gains/(losses) recognized during the period $ 378 $ (2,977) Less: Realized net gains/(losses) recognized during the period on equity securities sold 398 (19) Unrealized net gains/(losses) recognized during the period on equity securities still held $ (20) $ (2,958)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted earnings per share	The following table presents the computation of basic and diluted earnings per share: Three months ended March 31, (in thousands except share and per share data) 2021 2020 Numerator: Net income/(loss) $ 71,938 $ (16,687) Preferred stock dividends 3,779 2,438 Net income/(loss) available to common stockholders $ 68,159 $ (19,125) Denominator: Denominator for basic earnings per share—weighted average shares 50,513,277 50,373,580 Effect of employee stock-based awards(1) 556,234 101,222 Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions 51,069,511 50,474,802 Basic earnings/(loss) per common share $ 1.35 $ (0.38) Diluted earnings/(loss) per common share $ 1.33 $ (0.38) (1) SARs and RSUs outstanding of 80,263 at March 31, 2021 and 428,007 at March 31, 2020 have not been included in diluted earnings/(loss) per share because to do so would have been antidilutive for the periods presented.

Loans Held for Investment and_2

Loans Held for Investment and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Schedule of loans held for investments	Loans held for investment are summarized by portfolio segment as follows: (in thousands) March 31, 2021 December 31, 2020 Commercial $ 8,969,224 $ 8,861,580 Energy 691,806 766,217 Mortgage finance(1) 9,009,081 9,079,409 Real estate 5,810,590 5,794,624 Gross loans held for investment(2) 24,480,701 24,501,830 Unearned income (net of direct origination costs) (72,446) (70,970) Allowance for credit losses on loans (242,484) (254,615) Total loans held for investment, net(2) $ 24,165,771 $ 24,176,245 (1) Balances at March 31, 2021 and December 31, 2020 are stated net of $1.0 billion and $1.2 billion of participations sold, respectively. (2) Excludes accrued interest receivable of $55.9 million and $56.5 million at March 31, 2021 and December 31, 2020, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets.
Schedule of the credit risk profile of loan portfolio by internally assigned grades and nonaccrual status	The following table summarizes our gross loans held for investment by year of origination and internally assigned credit grades: (in thousands) 2021 2020 2019 2018 2017 2016 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total March 31, 2021 Commercial (1-7) Pass $ 341,043 $ 3,548,075 $ 602,736 $ 462,947 $ 290,409 $ 318,287 $ 2,989,607 $ 44,992 $ 8,598,096 (8) Special mention — 4,120 87,653 47,936 19,139 7,276 10,194 12,734 189,052 (9) Substandard - accruing 17,850 1,903 27,269 28,182 10,464 26,775 23,804 7,635 143,882 (9+) Non-accrual — 7,135 3,254 1,037 5,971 12,912 7,218 667 38,194 Total commercial $ 358,893 $ 3,561,233 $ 720,912 $ 540,102 $ 325,983 $ 365,250 $ 3,030,823 $ 66,028 $ 8,969,224 Energy (1-7) Pass $ 15,515 $ — $ — $ 4,844 $ 8,893 $ 29,279 $ 515,359 $ — $ 573,890 (8) Special mention — — — — — 10,664 53,299 — 63,963 (9) Substandard - accruing — — — — — — 24,585 — 24,585 (9+) Non-accrual 10,036 — 8,153 — — 11,179 — — 29,368 Total energy $ 25,551 $ — $ 8,153 $ 4,844 $ 8,893 $ 51,122 $ 593,243 $ — $ 691,806 Mortgage finance (1-7) Pass $ 14,962 $ 716,845 $ 951,866 $ 799,447 $ 455,911 $ 6,070,050 $ — $ — $ 9,009,081 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 14,962 $ 716,845 $ 951,866 $ 799,447 $ 455,911 $ 6,070,050 $ — $ — $ 9,009,081 Real estate CRE (1-7) Pass $ 60,652 $ 418,403 $ 935,071 $ 862,447 $ 370,347 $ 554,723 $ 50,041 $ 60,805 $ 3,312,489 (8) Special mention — 3,475 15,071 34,642 48,234 59,183 — — 160,605 (9) Substandard - accruing — — 318 47,240 53,504 92,750 — 15,390 209,202 (9+) Non-accrual — — — 458 — 4,991 — 1,247 6,696 RBF (1-7) Pass 54,499 164,712 38,505 28,451 1,538 15,351 592,624 — 895,680 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 26,932 195,760 149,874 108,258 101,509 183,679 17,412 32,983 816,407 (8) Special mention — — 6,650 48 — 8,686 — 1,018 16,402 (9) Substandard - accruing — — — 4,228 14,354 16,238 — — 34,820 (9+) Non-accrual — — — — 908 8,057 — 14,289 23,254 Secured by 1-4 family (1-7) Pass 19,857 64,953 61,951 40,974 47,903 89,788 4,535 — 329,961 (8) Special mention — — — — — 1,770 — — 1,770 (9) Substandard - accruing — — — — 818 2,268 — — 3,086 (9+) Non-accrual — — — — — 218 — — 218 Total real estate $ 161,940 $ 847,303 $ 1,207,440 $ 1,126,746 $ 639,115 $ 1,037,702 $ 664,612 $ 125,732 $ 5,810,590 Total loans held for investment $ 561,346 $ 5,125,381 $ 2,888,371 $ 2,471,139 $ 1,429,902 $ 7,524,124 $ 4,288,678 $ 191,760 $ 24,480,701
Schedule of activity in the reserve for loan losses by portfolio segment	The following table details activity in the allowance for credit losses on loans. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Energy Mortgage Real Total Three months ended March 31, 2021 Allowance for credit losses on loans: Beginning balance $ 73,061 $ 84,064 $ 4,699 $ 92,791 $ 254,615 Provision for credit losses on loans (1,001) (5,852) 211 929 (5,713) Charge-offs 2,451 5,732 — — 8,183 Recoveries 1,050 715 — — 1,765 Net charge-offs (recoveries) 1,401 5,017 — — 6,418 Ending balance $ 70,659 $ 73,195 $ 4,910 $ 93,720 $ 242,484 Three months ended March 31, 2020 Allowance for credit losses on loans: Beginning balance $ 102,254 $ 60,253 $ 2,265 $ 30,275 $ 195,047 Impact of Current Expected Credit Loss ("CECL") adoption (15,740) 24,154 2,031 (1,860) 8,585 Provision for credit losses on loans 24,902 66,821 35 3,271 95,029 Charge-offs 20,653 37,730 — — 58,383 Recoveries 257 423 — — 680 Net charge-offs (recoveries) 20,396 37,307 — — 57,703 Ending balance $ 91,020 $ 113,921 $ 4,331 $ 31,686 $ 240,958
Schedule of impaired loans, by portfolio class	The table below provides an age analysis of our loans held for investment: (in thousands) 30-59 Days 60-89 Days 90 Days or More Past Due(1) Total Past Non-accrual loans as of March 31, 2021 (2) Current Total Non-accrual With No Allowance March 31, 2021 Commercial $ 15,563 $ 2,905 $ 3,885 $ 22,353 $ 38,194 $ 8,908,677 $ 8,969,224 $ 15,860 Energy — — — — 29,368 662,438 691,806 18,189 Mortgage finance loans — — — — — 9,009,081 9,009,081 — Real estate CRE 14,939 — 2,238 17,177 6,696 3,665,119 3,688,992 1,849 RBF — — — — — 895,680 895,680 — Other 105 — — 105 23,254 867,524 890,883 7,864 Secured by 1-4 family 55 — 64 119 218 334,698 335,035 — Total loans held for investment $ 30,662 $ 2,905 $ 6,187 $ 39,754 $ 97,730 $ 24,343,217 $ 24,480,701 $ 43,762 (1) Loans past due 90 days and still accruing includes premium finance loans of $3.1 million. These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The receipt of the refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date. (2) As of March 31, 2021 and December 31, 2020, none of our non-accrual loans were earning interest income on a cash basis. Additionally, no interest income was recognized on non-accrual loans for the three months ended March 31, 2021. Accrued interest of $339,000 was reversed during the three months ended March 31, 2021.
Financing Receivable, Nonaccrual	The following table summarizes collateral-dependent gross loans held for investment by collateral type as follows: Collateral Type (in thousands) Real Property Rolling Stock Total March 31, 2021 Commercial $ — $ 774 $ 774 Real estate CRE 4,619 — 4,619 Other 5,984 — 5,984 Total collateral-dependent loans held for investment $ 10,603 $ 774 $ 11,377

Certain Transfers of Financia_2

Certain Transfers of Financial Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Transfers and Servicing [Abstract]
Schedule of Loans Held-for-sale [Table Text Block]	The table below presents a reconciliation of the changes in loans held for sale: Three Months Ended March 31, (in thousands) 2021 2020 Outstanding balance(1): Beginning balance $ 281,137 $ 2,568,362 Loans purchased and originated 1,133,239 2,356,710 Payments and loans sold (1,236,738) (4,165,492) Ending balance 177,638 759,580 Fair value adjustment: Beginning balance 2,028 8,772 Increase/(decrease) to fair value (3,380) 5,712 Ending balance (1,352) 14,484 Loans held for sale at fair value $ 176,286 $ 774,064 (1) Includes $44.1 million of loans held for sale that are carried at lower of cost or market as of December 31, 2020, as well as $5.8 million as of December 31, 2019.
Schedule of Mortgage Servicing Rights Activity [Table Text Block]	retain the right to service the loans sold through our MCA program, creating MSRs which are recorded as assets on our consolidated balance sheets. A summary of MSR activity is as follows: Three months ended March 31, (in thousands) 2021 2020 MSRs: Balance, beginning of year $ 131,391 $ 70,707 Capitalized servicing rights 11,867 20,615 Amortization (12,643) (4,885) Balance, end of period $ 130,615 $ 86,437 Valuation allowance: Balance, beginning of year $ 25,967 $ 5,803 Change in valuation allowance (16,448) 10,015 Balance, end of period $ 9,519 $ 15,818 MSRs, net $ 121,096 $ 70,619 MSRs, fair value $ 132,580 $ 70,619
Schedule of Fair Value Assumption Used to Value Mortgage Servicing Rights Retained [Table Text Block]	The following summarizes the assumptions used by management to determine the fair value of MSRs: March 31, 2021 December 31, 2020 Average discount rates 9.08 % 9.09 % Expected prepayment speeds 12.10 % 16.37 % Weighted-average life, in years 6.3 4.9
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]	A sensitivity analysis of changes in the fair value of our MSR portfolio resulting from certain key assumptions is presented in the following table: (in thousands) March 31, 2021 December 31, 2020 50 bp adverse change in prepayment speed $ (15,593) $ (12,203) 100 bp adverse change in prepayment speed (27,503) (16,062)

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Subordinated Borrowings [Abstract]
Schedule of details of the trust preferred subordinated debentures	As of December 31, 2020, the details of the trust preferred subordinated debentures are summarized below: (dollar amounts in thousands) Texas Capital Texas Capital Texas Capital Texas Capital Texas Capital Date issued November 19, 2002 April 10, 2003 October 6, 2005 April 28, 2006 September 29, 2006 Trust preferred securities issued $10,310 $10,310 $25,774 $25,774 $41,238 Floating or fixed rate securities Floating Floating Floating Floating Floating Interest rate on subordinated debentures 3 month LIBOR + 3.35% 3 month LIBOR + 3.25% 3 month LIBOR + 1.51% 3 month LIBOR + 1.60% 3 month LIBOR + 1.71% Maturity date November 2032 April 2033 December 2035 June 2036 December 2036

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Tables)	3 Months Ended
	Mar. 31, 2021
Risks and Uncertainties [Abstract]
Schedule of financial instruments with off-balance sheet risk	The table below presents our financial instruments with off-balance sheet risk, as well as the activity in the allowance for off-balance sheet credit losses related to those financial instruments. This allowance is recorded in other liabilities on the consolidated balance sheets. Three months ended March 31, (in thousands) 2021 2020 Beginning balance of allowance for off-balance sheet credit losses $ 17,434 $ 8,640 Impact of CECL adoption — 563 Provision for off-balance sheet credit losses (287) 971 Ending balance of allowance for off-balance sheet credit losses $ 17,147 $ 10,174 (in thousands) March 31, 2021 December 31, 2020 Commitments to extend credit - period end balance $ 8,115,679 $ 8,530,453 Standby letters of credit - period end balance $ 321,428 $ 268,894

Regulatory Restrictions (Tables

Regulatory Restrictions (Tables)	3 Months Ended
	Mar. 31, 2021
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of compliance with Regulatory Capital Requirements	The table below summarizes our actual and required capital ratios under the Basel III Capital Rules. The ratios presented below include the effects of our election to utilize the five-year CECL transition described above. Actual Minimum Capital Required - Basel III Fully Phased-In Required to be Considered Well Capitalized (dollars in thousands) Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio March 31, 2021 CET1 Company $ 2,765,597 10.19 % $ 1,900,393 7.00 % N/A N/A Bank 2,818,155 10.39 % 1,899,299 7.00 % 1,763,635 6.50 % Total capital (to risk-weighted assets) Company 3,811,962 14.04 % 2,850,590 10.50 % N/A N/A Bank 3,405,679 12.55 % 2,848,948 10.50 % 2,713,284 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,325,597 12.25 % 2,307,621 8.50 % N/A N/A Bank 2,978,155 10.98 % 2,306,291 8.50 % 2,170,627 8.00 % Tier 1 capital (to average assets)(1) Company 3,325,597 8.32 % 1,598,426 4.00 % N/A N/A Bank 2,978,155 7.46 % 1,597,924 4.00 % 1,997,405 5.00 % December 31, 2020 CET1 Company $ 2,708,150 9.35 % $ 2,026,400 7.00 % N/A N/A Bank 2,744,211 9.48 % 2,025,417 7.00 % 1,880,745 6.50 % Total capital (to risk-weighted assets) Company 3,498,737 12.08 % 3,039,600 10.50 % N/A N/A Bank 3,375,983 11.67 % 3,038,126 10.50 % 2,893,453 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,968,150 10.25 % 2,460,628 8.50 % N/A N/A Bank 2,904,211 10.04 % 2,459,435 8.50 % 2,314,763 8.00 % Tier 1 capital (to average assets)(1) Company 2,968,150 7.52 % 1,578,651 4.00 % N/A N/A Bank 2,904,211 7.36 % 1,578,207 4.00 % 1,972,758 5.00 % (1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, the Federal Reserve Board and the FDIC may require the Company and the Bank, respectively, to maintain a Tier 1 capital ratio (to average assets) above the required minimum.

Stock-based Compensation (Table

Stock-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Compensation Related Costs [Abstract]
Schedule of stock-based compensation costs	The table below summarizes our stock-based compensation expense: Three months ended March 31, (in thousands) 2021 2020 Stock-settled awards: RSUs $ 5,460 $ 3,219 Restricted stock 1 8 Cash-settled units 907 142 Total $ 6,368 $ 3,369
Schedule of unrecognized compensation costs	(in thousands except period data) March 31, 2021 Unrecognized compensation expense related to unvested stock-settled awards $ 52,268 Weighted average period over which expense is expected to be recognized, in years 2.4

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value	Assets and liabilities measured at fair value are as follows: Fair Value Measurements Using (in thousands) Level 1 Level 2 Level 3 March 31, 2021 Available-for-sale debt securities:(1) U.S. government agency securities $ — $ 119,840 $ — Residential mortgage-backed securities — 3,095,787 — Tax-exempt asset-backed securities — — 181,566 CRT securities — — 11,465 Equity securities(1)(2) 27,261 7,139 — Loans held for sale(3) — 169,011 7,275 Loans held for investment(4) — — 9,122 Derivative assets(5) — 70,387 — Derivative liabilities(5) — 69,283 — Non-qualified deferred compensation plan liabilities(6) 27,351 — — December 31, 2020 Available-for-sale debt securities:(1) U.S. government agency securities $ — $ 123,589 $ — Residential mortgage-backed securities — 2,828,956 — Tax-exempt asset-backed securities — — 199,176 CRT securities — — 11,417 Equity securities(1)(2) 26,593 7,239 — Loans held for sale(3) — 232,147 6,933 Loans held for investment(4) — — 21,209 Derivative assets(5) — 102,720 — Derivative liabilities(5) — 99,255 — Non-qualified deferred compensation plan liabilities(6) 26,593 — — (1) Securities are measured at fair value on a recurring basis, generally monthly, except for tax-exempt asset-backed securities and CRT securities which are measured quarterly. (2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. (3) Loans held for sale purchased through our MCA program are measured at fair value on a recurring basis, generally monthly. (4) Includes certain collateral-dependent loans held for investment for which a specific allocation of the allowance for credit losses is based upon the fair value of the loan’s underlying collateral. These loans held for investment are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions. (5) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly. (6) Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which generally corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents a reconciliation of the level 3 fair value category measured at fair value on a recurring basis: Net Realized/Unrealized Gains (Losses) (in thousands) Balance at Beginning of Period Purchases / Additions Sales / Reductions Realized Unrealized Balance at End of Period Three months ended March 31, 2021 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 199,176 $ — $ (11,371) $ — $ (6,239) $ 181,566 CRT securities 11,417 — — — 48 11,465 Loans held for sale(2) 6,933 537 (279) 5 79 7,275 Three months ended March 31, 2020 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 197,027 $ — $ (4,353) $ — $ (1,200) $ 191,474 CRT securities 11,964 — — — (3,949) 8,015 Loans held for sale(2) 7,043 213 (684) 28 94 6,694 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI and relate to assets that remain outstanding at period end. Realized gains/(losses) are recorded in other non-interest income. (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in gain/(loss) on sale of loans held for sale.
Summary of the carrying amounts and estimated fair values of financial instruments	A summary of the carrying amounts and estimated fair values of financial instruments is as follows: March 31, 2021 December 31, 2020 (in thousands) Carrying Estimated Carrying Estimated Financial assets: Level 1 inputs: Cash and cash equivalents $ 11,428,111 $ 11,428,111 $ 9,206,380 $ 9,206,380 Investment securities 27,261 27,261 26,593 26,593 Level 2 inputs: Investment securities 3,222,766 3,222,766 2,959,784 2,959,784 Loans held for sale 169,011 169,011 232,147 232,147 Derivative assets 70,387 70,387 102,720 102,720 Level 3 inputs: Investment securities 193,031 193,031 210,593 210,593 Loans held for sale 7,275 7,275 6,933 6,933 Loans held for investment, net 24,165,771 24,217,032 24,176,245 24,233,185 Financial liabilities: Level 2 inputs: Federal funds purchased and repurchase agreements 115,587 115,587 111,751 111,751 Other borrowings 2,400,000 2,400,000 3,000,000 3,000,000 Long-term debt 664,968 672,996 395,896 405,110 Derivative liabilities 69,283 69,283 99,255 99,255 Level 3 inputs: Deposits 33,391,970 33,392,592 30,996,589 30,997,980

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The notional amounts and estimated fair values of derivative positions outstanding are presented in the following table: March 31, 2021 December 31, 2020 Estimated Fair Value Estimated Fair Value (in thousands) Notional Asset Derivative Liability Derivative Notional Asset Derivative Liability Derivative Non-hedging derivatives: Financial institution counterparties: Commercial loan/lease interest rate swaps $ 1,826,115 $ 2,387 $ 66,363 $ 1,922,956 $ 71 $ 96,246 Commercial loan/lease interest rate caps 655,917 88 — 565,634 34 — Foreign currency forward contracts 6,664 96 18 6,667 214 78 Customer counterparties: Commercial loan/lease interest rate swaps 1,826,115 66,363 2,387 1,922,956 96,246 71 Commercial loan/lease interest rate caps 655,917 — 88 565,634 — 34 Foreign currency forward contracts 6,664 18 96 6,667 78 214 Economic hedging derivatives to hedge: Residential MSRs: Interest rate swap futures 170,000 — 954 320,000 474 — Forward sale commitments 75,000 77 615 155,000 551 — Loans held for sale: Loan purchase commitments 198,072 531 1,149 332,145 5,123 8 Forward sale commitments 342,218 3,214 — 485,326 — 2,675 Gross derivatives 72,774 71,670 102,791 99,326 Offsetting derivative assets/liabilities (2,387) (2,387) (71) (71) Net derivatives included in the consolidated balance sheets $ 70,387 $ 69,283 $ 102,720 $ 99,255
Schedule Of Weighted Average Interest Rate Received And Paid	The weighted-average received and paid interest rates for interest rate swaps outstanding were as follows: March 31, 2021 December 31, 2020 Weighted-Average Interest Rate Received Paid Received Paid Non-hedging interest rate swaps 2.99 % 1.27 % 3.14 % 1.38 %

Operations and Summary of Sig_3

Operations and Summary of Significant Accounting Policies - Revision of Prior Period Financial Statements, Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other liabilities	$ 316,797	$ 339,486
Liabilities	36,894,951	34,854,872
Retained earnings	1,781,215	1,713,056
Total stockholders’ equity	$ 3,159,482	$ 2,871,224	$ 2,772,596	$ 2,801,321

Operations and Summary of Sig_4

Operations and Summary of Significant Accounting Policies - Revision of Prior Period Financial Statements, Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Salaries and employee benefits	$ 87,522	$ 77,193
Other non-interest expense	8,975	10,260
Non-interest expense	150,316	165,417
Income before income taxes	94,849	(21,318)
Net income	71,938	(16,687)
Net income available to common stockholders	68,159	(19,125)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (273)	$ (20,868)

Operations and Summary of Sig_5

Operations and Summary of Significant Accounting Policies - Revision of Prior Period Financial Statements, Equity Statement (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained Earnings (Accumulated Deficit), Beginning Balance	$ 1,713,056
Beginning balance - Amount	2,871,224	$ 2,772,596	$ 2,801,321
Retained Earnings (Accumulated Deficit), Ending Balance	1,781,215	1,713,056
Ending balance - Amount	$ 3,159,482	$ 2,871,224	$ 2,772,596

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 3,480,098	$ 3,143,171
Gross Unrealized Gains	8,364	25,803
Gross Unrealized Losses	(79,804)	(5,836)
Estimated Fair Value	3,408,658	3,163,138
Interest receivable	55,900	56,500
Available-for-sale Securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Interest receivable	6,300	6,000
U.S. government agency securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	125,000	125,000
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(5,160)	(1,412)
Estimated Fair Value	119,840	123,589
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	3,166,816	2,818,518
Gross Unrealized Gains	367	11,566
Gross Unrealized Losses	(71,396)	(1,128)
Estimated Fair Value	3,095,787	2,828,956
Tax-exempt asset-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	173,569	184,940
Gross Unrealized Gains	7,997	14,236
Gross Unrealized Losses	0	0
Estimated Fair Value	181,566	199,176
Credit risk transfer securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	14,713	14,713
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,248)	(3,296)
Estimated Fair Value	$ 11,465	$ 11,417

Investment Securities (Details

Investment Securities (Details 1) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)security	Dec. 31, 2020USD ($)
Amortized cost
Amortized Cost	$ 3,480,098	$ 3,143,171
Estimated fair value
Total	3,408,658	3,163,138
Investment securities	$ 3,408,658	3,163,138
Weighted average yield
Federal tax rate (percent)	21.00%
Less Than 12 Months, Fair Value	$ 3,187,579	452,975
Less Than 12 Months, Unrealized Loss	(76,556)	(2,540)
12 Months or Longer, Fair Value	11,465	11,417
12 Months or Longer, Unrealized Loss	(3,248)	(3,296)
Total, Fair Value	3,199,044	464,392
Total, Unrealized Loss	$ (79,804)	(5,836)
Available-for-sale Securities, Other Disclosure Items
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	108
Debt Securities, Available-for-sale, Amortized Cost	$ 3,480,098	3,143,171
U.S. government agency securities
Amortized cost
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	125,000	125,000
After Ten Years	0	0
Amortized Cost	125,000	125,000
Estimated fair value
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	119,840	123,589
After Ten Years	0	0
Investment securities	$ 119,840	$ 123,589
Weighted average yield
Less Than One Year	0.00%	0.00%
After One Through Five Years	0.00%	0.00%
After Five Through Ten Years	1.13%	1.13%
After Ten Years	0.00%	0.00%
Total	1.13%	1.13%
Less Than 12 Months, Fair Value	$ 119,840	$ 98,588
Less Than 12 Months, Unrealized Loss	(5,160)	(1,412)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Loss	0	0
Total, Fair Value	119,840	98,588
Total, Unrealized Loss	$ (5,160)	(1,412)
Available-for-sale Securities, Other Disclosure Items
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5
Debt Securities, Available-for-sale, Amortized Cost	$ 125,000	125,000
Residential mortgage-backed securities
Amortized cost
Less Than One Year	0	0
After One Through Five Years	449	545
After Five Through Ten Years	17,368	17,500
After Ten Years	3,148,999	2,800,473
Amortized Cost	3,166,816	2,818,518
Estimated fair value
Less Than One Year	0	0
After One Through Five Years	499	605
After Five Through Ten Years	16,442	17,490
After Ten Years	3,078,846	2,810,861
Investment securities	$ 3,095,787	$ 2,828,956
Weighted average yield
Less Than One Year	0.00%	0.00%
After One Through Five Years	4.59%	4.58%
After Five Through Ten Years	1.08%	1.08%
After Ten Years	1.16%	1.25%
Total	1.16%	1.25%
Less Than 12 Months, Fair Value	$ 3,067,739	$ 354,387
Less Than 12 Months, Unrealized Loss	(71,396)	(1,128)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Loss	0	0
Total, Fair Value	3,067,739	354,387
Total, Unrealized Loss	$ (71,396)	(1,128)
Available-for-sale Securities, Other Disclosure Items
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	101
Debt Securities, Available-for-sale, Amortized Cost	$ 3,166,816	2,818,518
Tax-exempt asset-backed securities
Amortized cost
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	173,569	184,940
Amortized Cost	173,569	184,940
Estimated fair value
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	181,566	199,176
Investment securities	$ 181,566	$ 199,176
Weighted average yield
Less Than One Year	0.00%	0.00%
After One Through Five Years	0.00%	0.00%
After Five Through Ten Years	0.00%	0.00%
After Ten Years	4.95%	4.92%
Total	4.95%	4.92%
Available-for-sale Securities, Other Disclosure Items
Debt Securities, Available-for-sale, Amortized Cost	$ 173,569	$ 184,940
Credit risk transfer securities
Amortized cost
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	14,713	14,713
Amortized Cost	14,713	14,713
Estimated fair value
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	11,465	11,417
Investment securities	$ 11,465	$ 11,417
Weighted average yield
Less Than One Year	0.00%	0.00%
After One Through Five Years	0.00%	0.00%
After Five Through Ten Years	0.00%	0.00%
After Ten Years	0.11%	0.15%
Total	0.11%	0.15%
Less Than 12 Months, Fair Value	$ 0	$ 0
Less Than 12 Months, Unrealized Loss	0	0
12 Months or Longer, Fair Value	11,465	11,417
12 Months or Longer, Unrealized Loss	(3,248)	(3,296)
Total, Fair Value	11,465	11,417
Total, Unrealized Loss	$ (3,248)	(3,296)
Available-for-sale Securities, Other Disclosure Items
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	2
Debt Securities, Available-for-sale, Amortized Cost	$ 14,713	14,713
Customer repurchase agreements
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits	28,100	31,700
Deposits
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits	$ 1,600	$ 1,900

Investment Securities (Detail_2

Investment Securities (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Estimated fair value	$ 34,400		$ 33,800
Net gains/(losses) recognized during the period	378	$ (2,977)
Less: Realized net gains/(losses) recognized during the period on equity securities sold	398	(19)
Unrealized net gains/(losses) recognized during the period on equity securities still held	$ (20)	$ (2,958)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 71,938	$ (16,687)
Preferred stock dividends	3,779	2,438
Net income/(loss) available to common stockholders	$ 68,159	$ (19,125)
Denominator:
Basic earnings per share - weighted average shares	50,513,277	50,373,580
Effect of employee stock-based awards	556,234	101,222
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	51,069,511	50,474,802
Basic earnings/(loss) per common share	$ 1.35	$ (0.38)
Diluted earnings/(loss) per common share	$ 1.33	$ (0.38)
Stock options excluded from computation of EPS	80,263	428,007

Loans Held for Investment and_3

Loans Held for Investment and Allowance for Loan Losses - Loans By Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	$ 24,480,701	$ 24,501,830
Unearned income (net of direct origination costs)	(72,446)	(70,970)
Allowance for credit losses on loans	(242,484)	(254,615)	$ (240,958)	$ (195,047)
Loans held for investment, net	24,165,771	24,176,245
Participations sold	1,000,000	1,200,000
Interest receivable	55,900	56,500
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	8,969,224	8,861,580
Allowance for credit losses on loans	(70,659)	(73,061)	(91,020)	(102,254)
Energy
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	691,806	766,217
Allowance for credit losses on loans	(73,195)	(84,064)	(113,921)	(60,253)
Mortgage finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	9,009,081	9,079,409
Allowance for credit losses on loans	(4,910)	(4,699)	(4,331)	(2,265)
Real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	5,810,590	5,794,624
Allowance for credit losses on loans	$ (93,720)	$ (92,791)	$ (31,686)	$ (30,275)

Loans Held for Investment and_4

Loans Held for Investment and Allowance for Loan Losses - Loans by Credit Quality Grade (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 561,346
2019	5,125,381
2018	2,888,371
2017	2,471,139
2016	1,429,902
2016 and prior	7,524,124
Revolving lines of credit	4,288,678
Revolving lines of credit converted to term loans	191,760
Total	24,480,701	$ 24,501,830
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	358,893
2019	3,561,233
2018	720,912
2017	540,102
2016	325,983
2016 and prior	365,250
Revolving lines of credit	3,030,823
Revolving lines of credit converted to term loans	66,028
Total	8,969,224	8,861,580
Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	341,043
2019	3,548,075
2018	602,736
2017	462,947
2016	290,409
2016 and prior	318,287
Revolving lines of credit	2,989,607
Revolving lines of credit converted to term loans	44,992
Total	8,598,096
Commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	4,120
2018	87,653
2017	47,936
2016	19,139
2016 and prior	7,276
Revolving lines of credit	10,194
Revolving lines of credit converted to term loans	12,734
Total	189,052
Commercial | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	17,850
2019	1,903
2018	27,269
2017	28,182
2016	10,464
2016 and prior	26,775
Revolving lines of credit	23,804
Revolving lines of credit converted to term loans	7,635
Total	143,882
Commercial | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	7,135
2018	3,254
2017	1,037
2016	5,971
2016 and prior	12,912
Revolving lines of credit	7,218
Revolving lines of credit converted to term loans	667
Total	38,194
Energy
Financing Receivable, Credit Quality Indicator [Line Items]
2020	25,551
2019	0
2018	8,153
2017	4,844
2016	8,893
2016 and prior	51,122
Revolving lines of credit	593,243
Revolving lines of credit converted to term loans	0
Total	691,806	766,217
Energy | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	15,515
2019	0
2018	0
2017	4,844
2016	8,893
2016 and prior	29,279
Revolving lines of credit	515,359
Revolving lines of credit converted to term loans	0
Total	573,890
Energy | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	10,664
Revolving lines of credit	53,299
Revolving lines of credit converted to term loans	0
Total	63,963
Energy | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	0
Revolving lines of credit	24,585
Revolving lines of credit converted to term loans	0
Total	24,585
Energy | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2020	10,036
2019	0
2018	8,153
2017	0
2016	0
2016 and prior	11,179
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	29,368
Mortgage finance
Financing Receivable, Credit Quality Indicator [Line Items]
2020	14,962
2019	716,845
2018	951,866
2017	799,447
2016	455,911
2016 and prior	6,070,050
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	9,009,081	9,079,409
Mortgage finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	14,962
2019	716,845
2018	951,866
2017	799,447
2016	455,911
2016 and prior	6,070,050
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	9,009,081
Mortgage finance | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	0
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	0
Mortgage finance | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	0
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	0
Mortgage finance | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	0
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	0
Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	161,940
2019	847,303
2018	1,207,440
2017	1,126,746
2016	639,115
2016 and prior	1,037,702
Revolving lines of credit	664,612
Revolving lines of credit converted to term loans	125,732
Total	5,810,590	$ 5,794,624
Real estate | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,688,992
Real estate | Commercial Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	60,652
2019	418,403
2018	935,071
2017	862,447
2016	370,347
2016 and prior	554,723
Revolving lines of credit	50,041
Revolving lines of credit converted to term loans	60,805
Total	3,312,489
Real estate | Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	3,475
2018	15,071
2017	34,642
2016	48,234
2016 and prior	59,183
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	160,605
Real estate | Commercial Real Estate | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	318
2017	47,240
2016	53,504
2016 and prior	92,750
Revolving lines of credit	0
Revolving lines of credit converted to term loans	15,390
Total	209,202
Real estate | Commercial Real Estate | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	458
2016	0
2016 and prior	4,991
Revolving lines of credit	0
Revolving lines of credit converted to term loans	1,247
Total	6,696
Real estate | Residential Homebuilder Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Total	895,680
Real estate | Residential Homebuilder Finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	54,499
2019	164,712
2018	38,505
2017	28,451
2016	1,538
2016 and prior	15,351
Revolving lines of credit	592,624
Revolving lines of credit converted to term loans	0
Total	895,680
Real estate | Residential Homebuilder Finance | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	0
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	0
Real estate | Residential Homebuilder Finance | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	0
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	0
Real estate | Residential Homebuilder Finance | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	0
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	0
Real estate | Other Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Total	890,883
Real estate | Other Financing Receivable | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	26,932
2019	195,760
2018	149,874
2017	108,258
2016	101,509
2016 and prior	183,679
Revolving lines of credit	17,412
Revolving lines of credit converted to term loans	32,983
Total	816,407
Real estate | Other Financing Receivable | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	6,650
2017	48
2016	0
2016 and prior	8,686
Revolving lines of credit	0
Revolving lines of credit converted to term loans	1,018
Total	16,402
Real estate | Other Financing Receivable | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	4,228
2016	14,354
2016 and prior	16,238
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	34,820
Real estate | Other Financing Receivable | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	908
2016 and prior	8,057
Revolving lines of credit	0
Revolving lines of credit converted to term loans	14,289
Total	23,254
Real estate | Secured by 1-4 family
Financing Receivable, Credit Quality Indicator [Line Items]
Total	335,035
Real estate | Secured by 1-4 family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	19,857
2019	64,953
2018	61,951
2017	40,974
2016	47,903
2016 and prior	89,788
Revolving lines of credit	4,535
Revolving lines of credit converted to term loans	0
Total	329,961
Real estate | Secured by 1-4 family | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	1,770
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	1,770
Real estate | Secured by 1-4 family | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	818
2016 and prior	2,268
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	3,086
Real estate | Secured by 1-4 family | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2016 and prior	218
Revolving lines of credit	0
Revolving lines of credit converted to term loans	0
Total	$ 218

Loans Held for Investment and_5

Loans Held for Investment and Allowance for Loan Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 254,615	$ 195,047
Provision for credit losses on loans	(5,713)	95,029
Charge-offs	8,183	58,383
Recoveries	1,765	680
Net charge-offs (recoveries)	6,418	57,703
Ending balance	242,484	240,958
Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		8,585
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	73,061	102,254
Provision for credit losses on loans	(1,001)	24,902
Charge-offs	2,451	20,653
Recoveries	1,050	257
Net charge-offs (recoveries)	1,401	20,396
Ending balance	70,659	91,020
Commercial | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		(15,740)
Energy
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	84,064	60,253
Provision for credit losses on loans	(5,852)	66,821
Charge-offs	5,732	37,730
Recoveries	715	423
Net charge-offs (recoveries)	5,017	37,307
Ending balance	73,195	113,921
Energy | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		24,154
Mortgage finance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,699	2,265
Provision for credit losses on loans	211	35
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	4,910	4,331
Mortgage finance | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		2,031
Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	92,791	30,275
Provision for credit losses on loans	929	3,271
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	$ 93,720	31,686
Real estate | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		$ (1,860)

Loans Held for Investment and_6

Loans Held for Investment and Allowance for Loan Losses - Impact of Adoption Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable Allowance For Credit Losses Off Balance Sheet Liability	$ 17,147	$ 10,174	$ 17,434		$ 8,640
Provision for credit losses	(6,000)	96,000
Net charge-offs	6,418	57,703
Financing Receivable, before Allowance for Credit Loss	24,480,701		24,501,830
Criticized
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, before Allowance for Credit Loss	945,100	675,900
Leveraged Lending
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net charge-offs		57,700
Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net charge-offs	5,017	37,307
Financing Receivable, before Allowance for Credit Loss	691,806		$ 766,217
Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable Allowance For Credit Losses Off Balance Sheet Liability				$ 0	$ 563
Provision for credit losses	$ (6,000)	$ 96,000

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Loan Losses - Collateral Dependent (Details) $ in Thousands	Mar. 31, 2021USD ($)
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	$ 11,377
Real Property
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	10,603
Rolling Stock
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	774
Commercial
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	774
Commercial | Real Property
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	0
Commercial | Rolling Stock
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	774
Real estate | Other
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	5,984
Real estate | Other | Real Property
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	5,984
Real estate | Other | Rolling Stock
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	0
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	4,619
Commercial Real Estate | Real Property
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	4,619
Commercial Real Estate | Rolling Stock
Financing Receivable, Past Due [Line Items]
Collateral-dependent Loans	$ 0

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Loan Losses - Age Analysis (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 39,754,000
Non-accrual	97,730,000
Current	24,343,217,000
Total	24,480,701,000		$ 24,501,830,000
Non-accrual With No Allowance	43,762,000
Premium finance loans past due and still accruing	3,100,000
Nonaccrual, interest income	0	$ 0
Interest income reversed	339,000
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	30,662,000
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,905,000
Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	6,187,000
Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	22,353,000
Non-accrual	38,194,000
Current	8,908,677,000
Total	8,969,224,000		8,861,580,000
Non-accrual With No Allowance	15,860,000
Commercial | 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	15,563,000
Commercial | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,905,000
Commercial | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	3,885,000
Energy
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Non-accrual	29,368,000
Current	662,438,000
Total	691,806,000		766,217,000
Non-accrual With No Allowance	18,189,000
Energy | 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Energy | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Energy | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Mortgage finance
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Non-accrual	0
Current	9,009,081,000
Total	9,009,081,000		9,079,409,000
Non-accrual With No Allowance	0
Mortgage finance | 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Mortgage finance | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Mortgage finance | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate
Financing Receivable, Past Due [Line Items]
Total	5,810,590,000		$ 5,794,624,000
Real estate | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	17,177,000
Non-accrual	6,696,000
Current	3,665,119,000
Total	3,688,992,000
Non-accrual With No Allowance	1,849,000
Real estate | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Non-accrual	0
Current	895,680,000
Total	895,680,000
Non-accrual With No Allowance	0
Real estate | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Total Past Due	105,000
Non-accrual	23,254,000
Current	867,524,000
Total	890,883,000
Non-accrual With No Allowance	7,864,000
Real estate | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	119,000
Non-accrual	218,000
Current	334,698,000
Total	335,035,000
Non-accrual With No Allowance	0
Real estate | 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	14,939,000
Real estate | 30 to 59 Days Past Due | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate | 30 to 59 Days Past Due | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Total Past Due	105,000
Real estate | 30 to 59 Days Past Due | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	55,000
Real estate | 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate | 60 to 89 Days Past Due | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate | 60 to 89 Days Past Due | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate | 60 to 89 Days Past Due | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate | Greater Than 90 Days | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,238,000
Real estate | Greater Than 90 Days | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate | Greater Than 90 Days | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Real estate | Greater Than 90 Days | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 64,000

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Loan Losses - Restructured Loans (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Nonaccrual loans that met the criteria for restructured	$ 33.7	$ 45.4

Certain Transfers of Financia_3

Certain Transfers of Financial Assets Certain Transfers of Financial Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Outstanding balance:
Beginning balance	$ 281,137	$ 2,568,362
Loans purchased and originated	1,133,239	2,356,710
Payments and loans sold	(1,236,738)	(4,165,492)
Ending balance	177,638	759,580
Fair value adjustment:
Fair value over (under) outstanding balance	2,028	8,772
Increase/(decrease) to fair value	(3,380)	5,712
Fair value over (under) outstanding balance	(1,352)	14,484
Loans held for sale	176,286	774,064	$ 283,165
Small Business Administration Loans [Member]
Fair value adjustment:
Fair value over (under) outstanding balance	$ 44,100	$ 5,800

Certain Transfers of Financia_4

Certain Transfers of Financial Assets (Details 1) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	$ 177,638,000	$ 759,580,000	$ 281,137,000	$ 2,568,362,000
Total Past Due	39,754,000
Principal amount outstanding of loans in servicing portfolio	13,600,000,000		13,800,000,000
Escrow deposits related to servicing portfolio	153,800,000		152,600,000
Loss Contingency Accrual	648,000		621,000
Losses due to repurchase indemnification and make-whole obligations	30,000	2,100,000
Greater Than 90 Days
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	16,400,000		16,700,000
Total Past Due	6,187,000
Mortgage servicing rights
Loans and Leases Receivable Disclosure [Line Items]
Impairment charges	16,400,000	$ 10,000,000
Government guarantees | Greater Than 90 Days
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	3,300,000		3,300,000
Government guarantees | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Greater Than 90 Days
Loans and Leases Receivable Disclosure [Line Items]
Total Past Due	12,900,000		13,400,000
Non-accrual
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	$ 0		$ 7,000,000

Certain Transfers of Financia_5

Certain Transfers of Financial Assets (Details 2) - Mortgage Servicing Rights - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance, beginning of year	$ 131,391	$ 70,707
Capitalized servicing rights	11,867	20,615
Amortization	(12,643)	(4,885)
Balance, end of period	130,615	86,437
Valuation Allowance for Impairment of Recognized Servicing Assets, Sales and Disposals [Abstract]
Valuation allowance, beginning balance	25,967	5,803
Change in valuation allowance	(16,448)	10,015
Valuation allowance, ending balance	9,519	15,818
MSRs, net	121,096	70,619
Fair value	$ 132,580	$ 70,619

Certain Transfers of Financia_6

Certain Transfers of Financial Assets (Details 3) - Mortgage Servicing Rights	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Average discount rates (percent)	9.08%	9.09%
Expected prepayment speeds (percent)	12.10%	16.37%
Weighted-average life, in years	6 years 3 months 18 days	4 years 10 months 24 days

Certain Transfers of Financia_7

Certain Transfers of Financial Assets Certain Transfers of Financial Assets (Details 4) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Transfers and Servicing [Abstract]
50 bp adverse change in prepayment speed	$ (15,593)	$ (12,203)
100 bp adverse change in prepayment speed	$ (27,503)	$ (16,062)

Long-Term Debt (Details)

Long-Term Debt (Details) - USD ($)	Mar. 09, 2021	Mar. 31, 2021	Mar. 31, 2020	Jan. 31, 2014	Sep. 21, 2012
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued				$ 175,000,000	$ 111,000,000
Stated interest rate				5.25%	6.50%
Reference pool of mortgage warehouse loans		$ 2,200,000,000
Limit for loss risk transferred		$ 275,000,000
Senior Unsecured Credit-Linked Notes
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Face amount	$ 275,000,000
Weighted-average interest rate during the year		5.54%
LIBOR | Minimum | Senior Unsecured Credit-Linked Notes
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures, spread on variable rate	4.50%
LIBOR | Maximum | Senior Unsecured Credit-Linked Notes
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures, spread on variable rate	4.25%
Texas Capital Bancshares Statutory Trust I
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued		$ 10,310,000
Texas Capital Statutory Trust II
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued		10,310,000
Texas Capital Statutory Trust III
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued		25,774,000
Texas Capital Statutory Trust IV
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued		25,774,000
Texas Capital Statutory Trust V
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued		41,238,000
Trust preferred subordinated debentures
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Total borrowings		$ 113,400,000
Weighted-average interest rate during the year		2.19%	3.80%
Trust preferred subordinated debentures | Texas Capital Bancshares Statutory Trust I | LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures, spread on variable rate		3.35%
Trust preferred subordinated debentures | Texas Capital Statutory Trust II | LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures, spread on variable rate		3.25%
Trust preferred subordinated debentures | Texas Capital Statutory Trust III | LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures, spread on variable rate		1.51%
Trust preferred subordinated debentures | Texas Capital Statutory Trust IV | LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures, spread on variable rate		1.71%
Trust preferred subordinated debentures | Texas Capital Statutory Trust V | LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures, spread on variable rate		1.60%

Long-Term Debt (Details 1)

Long-Term Debt (Details 1) - USD ($) $ in Thousands	Mar. 31, 2021	Jan. 31, 2014	Sep. 21, 2012
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued		$ 175,000	$ 111,000
Texas Capital Bancshares Statutory Trust I
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued	$ 10,310
Texas Capital Statutory Trust II
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued	10,310
Texas Capital Statutory Trust III
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued	25,774
Texas Capital Statutory Trust IV
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued	25,774
Texas Capital Statutory Trust V
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued	$ 41,238

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Beginning balance of allowance for off-balance sheet credit losses	$ 17,434	$ 8,640
Provision for off-balance sheet credit losses	(287)	971
Ending balance of allowance for off-balance sheet credit losses	17,147	10,174
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	8,115,679		$ 8,530,453
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	$ 321,428		$ 268,894
Cumulative Effect, Period Of Adoption, Adjustment
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Beginning balance of allowance for off-balance sheet credit losses		$ 563

Regulatory Restrictions (Detail

Regulatory Restrictions (Details) $ in Thousands	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Jan. 01, 2019	Dec. 31, 2009USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Assets	$ 40,054,433	$ 37,726,096		$ 15,000,000
Mortgage finance(1)	9,009,081	9,079,409
Common Equity Tier 1 [Abstract]
CET1, actual amount	2,765,597	2,708,150
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	3,811,962	3,498,737
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	3,325,597	2,968,150
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	$ 3,325,597	$ 2,968,150
Banking Regulation, Risk-Based Information [Abstract]
CET1, actual ratio	10.19%	9.35%
Total capital (to risk weighted assets), actual ratio	0.1404	0.1208
Tier 1 capital (to risk-weighted assets), actual ratio	0.1225	0.1025
Tier 1 capital (to average assets), actual ratio	0.0832	0.0752
Bank
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 2,818,155	$ 2,744,211
CET1 to be well capitalized under prompt corrective action provisions, amount	1,763,635	1,880,745
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	3,405,679	3,375,983
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,713,284	2,893,453
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	2,978,155	2,904,211
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,170,627	2,314,763
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	2,978,155	2,904,211
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, amount	$ 1,997,405	$ 1,972,758
Banking Regulation, Risk-Based Information [Abstract]
CET1, actual ratio	10.39%	9.48%
CET1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Total capital (to risk weighted assets), actual ratio	0.1255	0.1167
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio	0.1000	0.1000
Tier 1 capital (to risk-weighted assets), actual ratio	0.1098	0.1004
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Tier 1 capital (to average assets), actual ratio	0.0746	0.0736
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Basel III, Phased-In
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount	$ 1,900,393	$ 2,026,400
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,850,590	3,039,600
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,307,621	2,460,628
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,598,426	$ 1,578,651
Banking Regulation, Risk-Based Information [Abstract]
CET1 for capital adequacy purposes, ratio	7.00%	7.00%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio	0.1050	0.1050
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio	0.0850	0.0850
Tier 1 capital (to average assets) for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, ratio			0.025
Basel III, Phased-In | Bank
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount	$ 1,899,299	$ 2,025,417
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,848,948	3,038,126
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,306,291	2,459,435
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,597,924	$ 1,578,207
Banking Regulation, Risk-Based Information [Abstract]
CET1 for capital adequacy purposes, ratio	7.00%	7.00%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio	0.1050	0.1050
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio	0.0850	0.0850
Tier 1 capital (to average assets) for capital adequacy purposes, ratio	0.0400	0.0400

Stock-based Compensation (Detai

Stock-based Compensation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 6,368	$ 3,369
Unrecognized compensation expense related to unvested stock-settled awards	$ 52,268
Weighted average period over which unrecognized compensation expense is expected to be recognized (in years)	2 years 4 months 24 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 5,460	3,219
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1	8
Cash-settled performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 907	$ 142
Long-Term Incentive Plan 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan	2,550

Fair Value Disclosures (Details

Fair Value Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	$ 3,408,658	$ 3,163,138
Investment securities	3,408,658	3,163,138
Loans held for sale	176,300	239,100
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	119,840	123,589
Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	181,566	199,176
Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	11,465	11,417
Fair value measurements, recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Non-qualified deferred compensation plan liabilities	27,351	26,593
Fair value measurements, recurring basis | Level 1 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 1 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 1 | Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 1 | Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	27,261	26,593
Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	169,011	232,147
Derivative liabilities		99,255
Non-qualified deferred compensation plan liabilities	0	0
Fair value measurements, recurring basis | Level 2 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	119,840	123,589
Fair value measurements, recurring basis | Level 2 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	3,095,787	2,828,956
Fair value measurements, recurring basis | Level 2 | Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 2 | Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	7,139	7,239
Fair value measurements, recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	7,275	6,933
Derivative assets	0	0
Derivative liabilities	0	0
Non-qualified deferred compensation plan liabilities	0	0
Fair value measurements, recurring basis | Level 3 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 3 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, recurring basis | Level 3 | Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	181,566	199,176
Fair value measurements, recurring basis | Level 3 | Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	11,465	11,417
Fair value measurements, recurring basis | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0	0
Fair value measurements, nonrecurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Fair value measurements, nonrecurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Fair value measurements, nonrecurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	9,122	21,209
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		102,720
Derivative liabilities		99,255
Not Designated as Hedging Instrument [Member] | Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	70,387	$ 102,720
Derivative liabilities	$ 69,283

Fair Value Disclosures (Detai_2

Fair Value Disclosures (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Tax-exempt asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	$ 199,176	$ 197,027
Purchases / Additions	0	0
Sales / Reductions	(11,371)	(4,353)
Realized	0	0
Unrealized	(6,239)	(1,200)
Balance at End of Period	181,566	191,474
Credit risk transfer securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	11,417	11,964
Purchases / Additions	0	0
Sales / Reductions	0	0
Realized	0	0
Unrealized	48	(3,949)
Balance at End of Period	11,465	8,015
Loans Held For Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	6,933	7,043
Purchases / Additions	537	213
Sales / Reductions	(279)	(684)
Realized	5	28
Unrealized	79	94
Balance at End of Period	$ 7,275	$ 6,694

Fair Value Disclosures (Detai_3

Fair Value Disclosures (Details 2) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Impaired loans
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Asset measured on nonrecurring basis, reported fair value	$ 9.1		$ 21.2
Asset measured on nonrecurring basis, carrying value	11.4		$ 25.3
Asset measured on nonrecurring basis, specific valuation allowance	$ 2.3	$ 4.1
Measurement Input, Discount Rate
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Loans Held-for-sale, measurement input	0.984		0.972
Minimum | Tax-exempt asset-backed securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, term	5 years 3 months 10 days
Minimum | Credit risk transfer securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, term	6 years 4 months 24 days
Minimum | Measurement Input, Discount Rate | Tax-exempt asset-backed securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0295
Minimum | Measurement Input, Discount Rate | Credit risk transfer securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0332
Maximum | Tax-exempt asset-backed securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, term	5 years 3 months 18 days
Maximum | Credit risk transfer securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, term	10 years 3 months 18 days
Maximum | Measurement Input, Discount Rate | Tax-exempt asset-backed securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0303
Maximum | Measurement Input, Discount Rate | Credit risk transfer securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0827
Weighted Average | Measurement Input, Discount Rate | Tax-exempt asset-backed securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0299		0.0249
AFS, term	5 years 3 months 14 days		5 years 6 months 10 days
Weighted Average | Measurement Input, Discount Rate | Credit risk transfer securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0497		0.0436
AFS, term	7 years 8 months 12 days		7 years 5 months 26 days

Fair Value Disclosures (Detai_4

Fair Value Disclosures (Details 3) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	$ 3,408,658	$ 3,163,138
Loans held for sale	176,300	239,100
Federal funds purchased and repurchase agreements	115,587	111,751
Long-term Debt	664,968	395,896
Level 1 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	27,261	26,593
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	11,428,111	9,206,380
Investment securities	27,261	26,593
Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	3,222,766	2,959,784
Loans held for sale	169,011	232,147
Derivative assets		102,720
Federal funds purchased and repurchase agreements	115,587	111,751
Other borrowings	2,400,000	3,000,000
Long-term Debt	664,968	395,896
Derivative liabilities		99,255
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	3,222,766	2,959,784
Loans held for sale	169,011	232,147
Derivative assets	70,387	102,720
Federal funds purchased and repurchase agreements	115,587	111,751
Other borrowings	2,400,000	3,000,000
Long-term Debt	672,996	405,110
Derivative liabilities	69,283	99,255
Level 3 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	193,031	210,593
Loans held for sale	7,275	6,933
Loans held for investment, net	24,165,771	24,176,245
Deposits	33,391,970	30,996,589
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	193,031	210,593
Loans held for sale	7,275	6,933
Loans held for investment, net	24,217,032	24,233,185
Deposits	$ 33,392,592	$ 30,997,980

Derivative Financial Instrume_3

Derivative Financial Instruments (Details 1) - Non-hedging - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Estimated fair value, asset derivative	$ 72,774	$ 102,791
Estimated fair value, liability derivative	71,670	99,326
Offsetting derivative liabilities	(2,387)	(71)
Offsetting derivative assets	(2,387)	(71)
Net asset derivatives included in the consolidated balance sheets		102,720
Net liability derivatives included in the consolidated balance sheets		99,255
Interest rate swap futures
Derivative [Line Items]
Notional amount	170,000	320,000
Estimated fair value, asset derivative	0	474
Estimated fair value, liability derivative	954	0
Forward sale commitments
Derivative [Line Items]
Notional amount	75,000	155,000
Estimated fair value, asset derivative	77	551
Estimated fair value, liability derivative	615	0
Interest rate contract | Loan purchase commitments
Derivative [Line Items]
Notional amount	198,072	332,145
Estimated fair value, asset derivative	531	5,123
Estimated fair value, liability derivative	1,149	8
Interest rate contract | Loan purchase commitments
Derivative [Line Items]
Notional amount	342,218	485,326
Estimated fair value, asset derivative	3,214	0
Estimated fair value, liability derivative	0	2,675
Financial institution counterparties | Commercial loan/lease | Interest rate swap
Derivative [Line Items]
Notional amount	1,826,115	1,922,956
Estimated fair value, asset derivative	2,387	71
Estimated fair value, liability derivative	66,363	96,246
Financial institution counterparties | Commercial loan/lease | Interest rate cap
Derivative [Line Items]
Notional amount	655,917	565,634
Estimated fair value, asset derivative	88	34
Estimated fair value, liability derivative	0	0
Financial institution counterparties | Commercial loan/lease | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	6,664	6,667
Estimated fair value, asset derivative	96	214
Estimated fair value, liability derivative	18	78
Customer counterparties | Commercial loan/lease | Interest rate swap
Derivative [Line Items]
Notional amount	1,826,115	1,922,956
Estimated fair value, asset derivative	66,363	96,246
Estimated fair value, liability derivative	2,387	71
Customer counterparties | Commercial loan/lease | Interest rate cap
Derivative [Line Items]
Notional amount	655,917	565,634
Estimated fair value, asset derivative	0	0
Estimated fair value, liability derivative	88	34
Customer counterparties | Commercial loan/lease | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	6,664	6,667
Estimated fair value, asset derivative	18	78
Estimated fair value, liability derivative	$ 96	$ 214

Derivative Financial Instrume_4

Derivative Financial Instruments Derivative Financial Instruments (Details 2) - Non-hedging - Commercial loan/lease - Interest rate swap	Mar. 31, 2021	Dec. 31, 2020
Interest rate received
Derivative [Line Items]
Weighted average fixed interest rate	2.99%	3.14%
Interest rate paid
Derivative [Line Items]
Weighted average fixed interest rate	1.27%	1.38%

Derivative Financial Instrume_5

Derivative Financial Instruments Derivative Financial Instruments (Details 3) $ in Millions	Mar. 31, 2021USD ($)instrument	Dec. 31, 2020USD ($)instrument
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 74.5	$ 108.3
Risk participation agreement - participant bank
Derivative [Line Items]
Instruments held | instrument	9	9
Maximum exposure	$ 4.9	$ 6
Notional amount	$ 119	$ 119.5
Risk participation agreement - lead bank
Derivative [Line Items]
Instruments held | instrument	15	16
Notional amount	$ 160.6	$ 165.9
Non-hedging | Commercial loan/lease
Derivative [Line Items]
Credit risk exposure, net of collateral pledged, relating to derivatives	$ 70.4	$ 102.7
Non-hedging | Interest rate cap | Commercial loan/lease
Derivative [Line Items]
Weighted average fixed interest rate	3.07%	3.41%
Interest-bearing deposits
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 73.5	$ 104.4
Other assets
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 1	$ 3.9

Material Transactions Affecti_2

Material Transactions Affecting Stockholders' Equity (Details) - USD ($)	Mar. 09, 2021	Mar. 31, 2021	Dec. 31, 2020
Equity Distribution Agreement [Line Items]
Preferred stock, Liquidation value		$ 1,000	$ 1,000
Issuance of stock - shares		300,000
Net proceeds from issuance of stock		$ 289,723,000
Par value of preferred stock		$ 0.01	$ 0.01
Series B Preferred Stock
Equity Distribution Agreement [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.75%
Preferred stock, Liquidation value	$ 1,000
Net proceeds from issuance of stock		$ 289,700,000
Depository Shares
Equity Distribution Agreement [Line Items]
Preferred stock, Liquidation value	$ 25
Issuance of stock - shares	12,000,000
Series A Preferred Stock
Equity Distribution Agreement [Line Items]
Preferred Stock, Dividend Rate, Percentage		6.50%
Par value of preferred stock		$ 0.01