Texas Capital Bancshares (TCBI) 10-Q 20 Oct 22 2022 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2022	Oct. 19, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-34657
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 Common Stock, Shares Outstanding		49,899,211
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Central Index Key	0001077428
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q3
Amendment Flag	false
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 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	9 Months Ended
	Sep. 30, 2022
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. (“we,” “us”, or the “Company”), 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 the Company and its wholly owned subsidiary, Texas Capital Bank (the “Bank”). We serve the needs of commercial businesses and 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 in or with operations in Texas. Our national lines of business provide specialized lending products to businesses throughout the United States. On September 6, 2022, we announced the sale of BankDirect Capital Finance (“BDCF” or “disposal group”), our insurance premium finance subsidiary, to AFCO Credit Corporation, an indirect wholly-owned subsidiary of Truist Financial Corp. The sale of BDCF includes its business operations and loan portfolio of approximately $3.1 billion as of September 30, 2022. The sale is an all-cash transaction for a purchase price of approximately $3.4 billion, representing an 8.5% asset premium compared to the value of the purchased loan portfolio as of September 30, 2022. The transaction resulted in the recognition of a disposal group that is classified as held for sale but does not meet the criteria for discontinued operations reporting. As such, the loans, assets and liabilities related to the disposal group were transferred at the lower of cost or fair value to loans held for sale, other assets held for sale and other liabilities held for sale, respectively, on the consolidated balance sheet as of September 30, 2022. The pre-tax net income for the disposal group for the three months ended September 30, 2022 and 2021 was $11.9 million and $17.4 million, respectively, and was $49.5 million and $48.7 million for the nine months ended September 30, 2022 and 2021, respectively. The sale is expected to close in the fourth quarter of 2022, subject to various customary closing conditions. 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 disclosures in the notes to consolidated unaudited financial statements that are 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 present a fair presentation of our financial position and results of operations. 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 U.S. Securities and Exchange Commission (“SEC”). Accordingly, the financial statements and the notes to the consolidated unaudited financial statements required by GAAP for complete annual financial statements do not include all of the information and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2021, included in our Annual Report on Form 10-K for the year ended December 31, 2021 (the “2021 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 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	9 Months Ended
	Sep. 30, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Standards	New Accounting Standards ASU 2022-02, “Financial Instruments - Credit Losses (Topic 326)” (“ASU 2022-02”) eliminates the guidance on troubled debt restructurings and requires entities to evaluate all loan modifications to determine if they result in a new loan or a continuation of the existing loan. ASU 2022-02 also requires that entities disclose current-period gross charge-offs by year of origination for loans and leases. ASU 2022-02 is effective January 1, 2023 and will have an impact on our financial statement disclosures. Accounting Standard Update 2022-04, “Liabilities - Supplier Finance Programs (Subtopic 405-50)” (“ASU 2022-04”) enhances the transparency of supplier finance programs and the related financial statement disclosures. The amendments require that a buyer in a supplier finance program disclose information about the key terms of the program, outstanding confirmed amounts as of the end of the period, a rollforward of such amounts during each annual period and a description of where in the financial statements outstanding amounts are presented. ASU 2022-04 is effective January 1, 2023, except for the disclosure of rollforward information, which is effective January 1, 2024, and is not expected to have an impact on our consolidated financial statements.

CONSOLIDATED BALANCE SHEETS - U

CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 240,609	$ 180,663
Interest bearing cash and cash equivalents	3,399,638	7,765,996
Available-for-sale debt securities	2,380,774	3,538,201
Held-to-maturity debt securities	955,875	0
Equity securities	32,973	45,607
Investment securities	3,369,622	3,583,808
Loans held for sale	3,142,178	8,123
Loans held for investment, mortgage finance	4,908,822	7,475,497
Loans held for investment	14,878,959	15,331,457
Less: Allowance for credit losses on loans	(234,613)	(211,866)
Total loans held for investment, net	19,553,168	22,595,088
Premises and equipment, net	27,180	20,901
Accrued interest receivable and other assets	648,172	559,897
Other assets held for sale	26,450	0
Goodwill and intangible assets, net	1,496	17,262
Total assets	30,408,513	34,731,738
Liabilities:
Non-interest bearing deposits	11,494,685	13,390,370
Interest bearing deposits	13,003,878	14,718,995
Total deposits	24,498,563	28,109,365
Accrued interest payable	18,465	7,699
Other liabilities	297,900	273,488
Other liabilities held for sale	75,564	0
Short-term borrowings	1,701,480	2,202,832
Long-term debt	930,766	928,738
Total liabilities	27,522,738	31,522,122
Stockholders’ equity:
Issued shares - 300,000 shares issued at September 30, 2022 and December 31, 2021	300,000	300,000
Issued shares - 50,840,022 and 50,618,911 at September 30, 2022 and December 31, 2021, respectively	509	506
Additional paid-in capital	1,020,153	1,008,559
Retained earnings	2,050,563	1,948,274
Treasury stock - 942,296 and 417 shares at cost at September 30, 2022 and December 31, 2021, respectively	(50,031)	(8)
Accumulated other comprehensive loss, net of taxes	(435,419)	(47,715)
Total stockholders’ equity	2,885,775	3,209,616
Total liabilities and stockholders’ equity	$ 30,408,513	$ 34,731,738

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
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	300,000	300,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	50,840,022	50,618,911
Treasury stock, shares	942,296	417

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME/(LOSS) - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income
Interest and fees on loans	$ 282,473	$ 202,748	$ 688,420	$ 616,153
Investment securities	15,002	10,235	46,969	31,040
Interest bearing cash and cash equivalents	24,596	3,606	37,561	9,500
Total interest income	322,071	216,589	772,950	656,693
Interest expense
Deposits	60,317	14,719	94,513	50,994
Short-term borrowings	10,011	748	15,628	3,842
Long-term debt	12,663	10,586	34,651	27,052
Total interest expense	82,991	26,053	144,792	81,888
Net interest income	239,080	190,536	628,158	574,805
Provision for credit losses	12,000	5,000	32,000	(20,000)
Net interest income after provision for credit losses	227,080	185,536	596,158	594,805
Non-interest income
Service charges on deposit accounts	5,701	4,622	17,726	13,972
Wealth management and trust fee income	3,631	3,382	11,594	9,380
Brokered loan fees	3,401	6,032	11,504	22,276
Servicing income	212	292	677	15,236
Investment banking and trading income	7,812	4,127	23,117	17,985
Net gain/(loss) on sale of loans held for sale	0	(1,185)	0	1,317
Other	4,576	7,509	7,239	26,605
Total non-interest income	25,333	24,779	71,857	106,771
Non-interest expense
Salaries and benefits	129,336	87,503	333,319	261,855
Occupancy expense	9,433	8,324	27,192	24,463
Marketing	8,282	2,123	21,765	5,720
Legal and professional	16,775	11,055	38,365	28,479
Communications and technology	18,470	28,374	48,819	58,695
Federal Deposit Insurance Corporation (“FDIC”) insurance assessment	3,953	4,500	11,252	16,339
Servicing-related expenses	0	2,396	0	27,740
Other	10,798	8,712	33,730	29,072
Total non-interest expense	197,047	152,987	514,442	452,363
Income before income taxes	55,366	57,328	153,573	249,213
Income tax expense	13,948	13,938	38,346	60,404
Net income	41,418	43,390	115,227	188,809
Preferred Stock Dividends and Other Adjustments [Abstract]
Preferred stock dividends	4,313	4,312	12,938	14,408
Net income available to common stockholders	37,105	39,078	102,289	174,401
Other comprehensive income/(loss):
Change in unrealized gain/(loss)	(207,204)	(18,131)	(494,261)	(71,501)
Amounts reclassified into net income	609	0	3,498	0
Other comprehensive income/(loss)	(206,595)	(18,131)	(490,763)	(71,501)
Income tax expense/(benefit)	(43,384)	(3,808)	(103,059)	(15,015)
Other comprehensive income/(loss), net of tax	(163,211)	(14,323)	(387,704)	(56,486)
Comprehensive income/(loss)	$ (121,793)	$ 29,067	$ (272,477)	$ 132,323
Basic earnings per common share
Basic earnings per common share	$ 0.74	$ 0.77	$ 2.03	$ 3.45
Diluted earnings per common share
Diluted earnings per common share	$ 0.74	$ 0.76	$ 2	$ 3.41

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - UNAUDITED - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, Common	Accumulated Other Comprehensive Income
Preferred stock, beginning balance - shares at Dec. 31, 2020		6,000,000
Common stock, beginning balance - shares at Dec. 31, 2020			50,470,867
Treasury stock, common, beginning balance - shares at Dec. 31, 2020						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	188,809				188,809
Change in other comprehensive income/(loss), net of taxes	(56,486)						(56,486)
Comprehensive income/(loss)	132,323
Stock-based compensation expense recognized in earnings	22,100			22,100
Issuance of preferred stock - Shares		300,000
Issuance of preferred stock - Amount	289,723	$ 300,000		(10,277)
Preferred stock dividend	(14,408)				(14,408)
Issuance of stock related to stock-based awards - Shares			135,176
Issuance of stock related to stock-based awards - Amount	(3,210)		$ 2	(3,212)
Redemption of preferred stock - shares		(6,000,000)
Redemption of preferred stock	(150,000)	$ (150,000)
Preferred stock, ending balance - shares at Sep. 30, 2021		300,000
Common stock, ending balance - shares at Sep. 30, 2021			50,606,043
Treasury stock, common, ending balance - shares at Sep. 30, 2021						417
Ending balance - Amount at Sep. 30, 2021	3,147,752	$ 300,000	$ 506	1,000,509	1,887,457	$ (8)	(40,712)
Preferred stock, beginning balance - shares at Jun. 30, 2021		300,000
Common stock, beginning balance - shares at Jun. 30, 2021			50,592,618
Treasury stock, common, beginning balance - shares at Jun. 30, 2021						417
Beginning balance - Amount at Jun. 30, 2021	3,114,957	$ 300,000	$ 506	992,469	1,848,379	$ (8)	(26,389)
Comprehensive income:
Net income	43,390				43,390
Change in other comprehensive income/(loss), net of taxes	(14,323)						(14,323)
Comprehensive income/(loss)	29,067
Stock-based compensation expense recognized in earnings	8,324			8,324
Preferred stock dividend	(4,312)				(4,312)
Issuance of stock related to stock-based awards - Shares			13,425
Issuance of stock related to stock-based awards - Amount	(284)		$ 0	(284)
Preferred stock, ending balance - shares at Sep. 30, 2021		300,000
Common stock, ending balance - shares at Sep. 30, 2021			50,606,043
Treasury stock, common, ending balance - shares at Sep. 30, 2021						417
Ending balance - Amount at Sep. 30, 2021	3,147,752	$ 300,000	$ 506	1,000,509	1,887,457	$ (8)	(40,712)
Preferred stock, beginning balance - shares at Dec. 31, 2021		300,000
Common stock, beginning balance - shares at Dec. 31, 2021			50,618,911
Treasury stock, common, beginning balance - shares at Dec. 31, 2021						417
Beginning balance - Amount at Dec. 31, 2021	3,209,616	$ 300,000	$ 506	1,008,559	1,948,274	$ (8)	(47,715)
Comprehensive income:
Net income	115,227				115,227
Change in other comprehensive income/(loss), net of taxes	(387,704)						(387,704)
Comprehensive income/(loss)	(272,477)
Stock-based compensation expense recognized in earnings	15,805			15,805
Preferred stock dividend	(12,938)				(12,938)
Issuance of stock related to stock-based awards - Shares			221,111
Issuance of stock related to stock-based awards - Amount	$ (4,208)		$ 3	(4,211)
Repurchase of common stock - shares	(941,879)					(941,879)
Repurchase of common stock	$ (50,023)					$ (50,023)
Preferred stock, ending balance - shares at Sep. 30, 2022		300,000
Common stock, ending balance - shares at Sep. 30, 2022			50,840,022
Treasury stock, common, ending balance - shares at Sep. 30, 2022						942,296
Ending balance - Amount at Sep. 30, 2022	2,885,775	$ 300,000	$ 509	1,020,153	2,050,563	$ (50,031)	(435,419)
Preferred stock, beginning balance - shares at Jun. 30, 2022		300,000
Common stock, beginning balance - shares at Jun. 30, 2022			50,820,337
Treasury stock, common, beginning balance - shares at Jun. 30, 2022						942,296
Beginning balance - Amount at Jun. 30, 2022	3,006,832	$ 300,000	$ 508	1,015,105	2,013,458	$ (50,031)	(272,208)
Comprehensive income:
Net income	41,418				41,418
Change in other comprehensive income/(loss), net of taxes	(163,211)						(163,211)
Comprehensive income/(loss)	(121,793)
Stock-based compensation expense recognized in earnings	5,376			5,376
Preferred stock dividend	(4,313)				(4,313)
Issuance of stock related to stock-based awards - Shares			19,685
Issuance of stock related to stock-based awards - Amount	(327)		$ 1	(328)
Preferred stock, ending balance - shares at Sep. 30, 2022		300,000
Common stock, ending balance - shares at Sep. 30, 2022			50,840,022
Treasury stock, common, ending balance - shares at Sep. 30, 2022						942,296
Ending balance - Amount at Sep. 30, 2022	$ 2,885,775	$ 300,000	$ 509	$ 1,020,153	$ 2,050,563	$ (50,031)	$ (435,419)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net income	$ 115,227	$ 188,809
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	32,000	(20,000)
Depreciation and amortization expense	35,360	65,943
Net (gain)/loss on sale of loans held for sale	0	(1,317)
Decrease in valuation allowance on mortgage servicing rights	0	(16,448)
Stock-based compensation expense	15,991	23,192
Purchases and originations of loans held for sale	(1,642)	(1,413,899)
Proceeds from sales and repayments of loans held for sale	5,050	1,675,246
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(2,152)	86,707
Accrued interest payable and other liabilities	14,266	(41,920)
Net cash provided by operating activities	214,100	546,313
Investing activities
Purchases of available-for-sale debt securities	(665,388)	(952,982)
Proceeds from maturities, redemptions and pay-downs of available-for-sale debt securities	388,223	400,429
Proceeds from maturities, redemptions and pay-downs of held-to-maturity debt securities	66,500	0
Sales/(purchases) of equity securities, net	(3,421)	0
Originations of loans held for investment, mortgage finance	(77,518,608)	(128,503,055)
Proceeds from pay-offs of loans held for investment, mortgage finance	80,085,283	129,054,151
Proceeds from sale of mortgage servicing rights	0	108,925
Net (increase)/decrease in loans held for investment, excluding mortgage finance	(2,690,164)	118,166
Purchases of premises and equipment, net	(10,456)	(2,619)
Net cash provided by/(used in) investing activities	(341,189)	223,015
Financing activities
Net decrease in deposits	(3,610,802)	(1,182,921)
Issuance of stock related to stock-based awards	(4,208)	(3,210)
Net proceeds from issuance of preferred stock	0	289,723
Redemption of preferred stock	0	(150,000)
Preferred stock dividends paid	(12,938)	(14,408)
Repurchase of common stock	(50,023)	0
Net decrease in short-term borrowings	(501,352)	(908,281)
Net proceeds from issuance of long-term debt	0	639,440
Repayments of Long-term Debt	0	(111,000)
Net cash used in financing activities	(4,179,323)	(1,440,657)
Net decrease in cash and cash equivalents	(4,306,412)	(671,329)
Cash and cash equivalents at beginning of period	7,946,659	9,206,380
Cash and cash equivalents at end of period	3,640,247	8,535,051
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	134,026	84,118
Cash paid during the period for income taxes	48,569	99,915
Transfers of loans from held for investment to held for sale	3,137,792	0
Transfers of debt securities from available-for-sale to held-to-maturity	$ 1,019,365	$ 0

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2022
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 September 30, Nine months ended September 30, (in thousands except share and per share data) 2022 2021 2022 2021 Numerator: Net income $ 41,418 $ 43,390 $ 115,227 $ 188,809 Preferred stock dividends 4,313 4,312 12,938 14,408 Net income available to common stockholders $ 37,105 $ 39,078 $ 102,289 $ 174,401 Denominator: Denominator for basic earnings per common share—weighted average common shares 49,891,727 50,600,732 50,506,364 50,568,439 Effect of dilutive outstanding stock-settled awards 526,157 538,823 584,151 555,836 Denominator for dilutive earnings per common share—weighted average diluted common shares 50,417,884 51,139,555 51,090,515 51,124,275 Basic earnings per common share $ 0.74 $ 0.77 $ 2.03 $ 3.45 Diluted earnings per common share $ 0.74 $ 0.76 $ 2.00 $ 3.41 Anti-dilutive outstanding stock-settled awards 174,706 208,813 315,499 104,174

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following is a summary of our investment securities: (in thousands) Amortized Gross Gross Estimated September 30, 2022 Available-for-sale debt securities: U.S. Treasury securities $ 668,093 $ — $ (30,812) $ 637,281 U.S. government agency securities 125,000 — (23,310) 101,690 Residential mortgage-backed securities 1,980,590 7 (350,496) 1,630,101 Credit risk transfer (“CRT”) securities 14,713 — (3,011) 11,702 Total available-for-sale debt securities 2,788,396 7 (407,629) 2,380,774 Held-to-maturity debt securities: Residential mortgage-backed securities 955,875 — (136,174) 819,701 Total held-to-maturity debt securities 955,875 — (136,174) 819,701 Equity securities 32,973 Total investment securities(2) $ 3,369,622 December 31, 2021 Available-for-sale debt securities: U.S. government agency securities $ 125,000 $ — $ (4,056) $ 120,944 Residential mortgage-backed securities 3,288,261 156 (63,039) 3,225,378 Tax-exempt asset-backed securities 170,626 9,407 — 180,033 CRT securities 14,713 — (2,867) 11,846 Total available-for-sale debt securities 3,598,600 9,563 (69,962) 3,538,201 Equity securities 45,607 Total investment securities(2) $ 3,583,808 (1) Excludes accrued interest receivable of $4.2 million and $6.6 million at September 30, 2022 and December 31, 2021, respectively, related to available-for-sale debt securities, and $1.5 million at September 30, 2022 related to held-to-maturity debt securities that is recorded in accrued interest receivable and other assets on the consolidated balance sheets. (2) Includes available-for-sale debt securities and equity securities at estimated fair value and held-to-maturity debt securities at amortized cost. Debt Securities In the first quarter of 2022, we transferred $1.0 billion of available-for-sale debt securities to held-to-maturity at fair value. The transfer was the result of deliberate actions taken to execute on our asset-liability management strategies in response to rising interest rates. Management determined that it has both the positive intent and ability to hold these securities to maturity. On the date of transfer, the difference between the carrying value and fair value of these securities, which was recorded, net of tax, as a loss in accumulated other comprehensive income/(loss) (“AOCI”), resulted in the securities transferring at a discount of $69.2 million. The discount and unrealized loss, net of tax, in AOCI will be amortized to interest income over the remaining life of the securities using the interest method. There were no gains or losses recognized as a result of this transfer. In the second quarter of 2022, our tax-exempt asset-backed securities were redeemed at par. The outstanding certificates were cancelled and related trusts were terminated. Unrealized gains and losses previously recorded, net of tax, in AOCI were reversed and no additional gains or losses were recognized as a result of the redemption. The amortized cost and estimated fair value as of September 30, 2022, excluding accrued interest receivable, of available-for-sale and held-to-maturity debt securities are presented below by contractual maturity. Actual maturities may differ from contractual maturities of mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. Available-for-Sale Held-to-Maturity (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 41 $ 41 $ — $ — Due after one year through five years 668,093 637,281 — — Due after five years through ten years 156,587 127,368 — — Due after ten years 1,963,675 1,616,084 955,875 819,701 Total $ 2,788,396 $ 2,380,774 $ 955,875 $ 819,701 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 September 30, 2022 U.S. treasury securities $ 637,281 $ (30,812) $ — $ — $ 637,281 $ (30,812) U.S. government agency securities — — 101,690 (23,310) 101,690 (23,310) Residential mortgage-backed securities 310,838 (67,167) 1,318,654 (283,329) 1,629,492 (350,496) CRT securities — — 11,702 (3,011) 11,702 (3,011) Total $ 948,119 $ (97,979) $ 1,432,046 $ (309,650) $ 2,380,165 $ (407,629) December 31, 2021 U.S. government agency securities $ 24,085 $ (915) $ 96,859 $ (3,141) $ 120,944 $ (4,056) Residential mortgage-backed securities 2,871,052 (50,721) 303,491 (12,318) 3,174,543 (63,039) CRT securities — — 11,846 (2,867) 11,846 (2,867) Total $ 2,895,137 $ (51,636) $ 412,196 $ (18,326) $ 3,307,333 $ (69,962) At September 30, 2022, we had 98 available-for-sale debt securities in an unrealized loss position, comprised of twelve U.S. treasury securities, five U.S. government agency securities, 79 residential mortgage-backed securities, and two CRT securities. The unrealized losses on the available-for-sale debt securities were the result of changes in market interest rates compared to the date the securities were acquired rather than the credit quality of the issuers or underlying loans. We do not intend to sell and it is not more likely than not that we will be required to sell these available-for-sale debt securities before recovery of the amortized cost of such securities in an unrealized loss position and have, therefore, recorded the unrealized losses related to this portfolio in AOCI. Held-to-maturity debt securities consist of government guaranteed securities for which no loss is expected. At September 30, 2022 and December 31, 2021, no allowance for credit losses was established for available-for-sale or held-to-maturity debt securities. Debt securities with carrying values of approximately $18.6 million and $1.4 million were pledged to secure certain customer repurchase agreements and deposits, respectively, at September 30, 2022. The comparative amounts at December 31, 2021 were $22.0 million and $2.0 million, respectively. Equity Securities Equity securities consist of investments that qualify for consideration under the regulations implementing the Community Reinvestment Act and investments related to our non-qualified deferred compensation plan. The following is a summary of unrealized and realized gains/(losses) recognized on equity securities included in other non-interest income on the consolidated statements of income and other comprehensive income/(loss): Three months ended September 30, Nine months ended September 30, (in thousands) 2022 2021 2022 2021 Net gains/(losses) recognized during the period $ (1,165) $ 850 $ (9,801) $ 4,496 Less: Realized net gains/(losses) recognized on securities sold (587) 347 (589) 1,096 Unrealized net gains/(losses) recognized on securities held $ (578) $ 503 $ (9,212) $ 3,400

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	9 Months Ended
	Sep. 30, 2022
Receivables [Abstract]
Loans and Allowance for Credit Losses on Loans	Loans and Allowance for Credit Losses on Loans Loans are summarized by portfolio segment as follows: (in thousands) September 30, 2022 December 31, 2021 Loans held for investment(1): Commercial $ 8,813,614 $ 9,897,561 Energy 1,106,097 721,373 Mortgage finance 4,908,822 7,475,497 Real estate 5,015,704 4,777,530 Gross loans held for investment 19,844,237 22,871,961 Unearned income (net of direct origination costs) (56,456) (65,007) Total loans held for investment 19,787,781 22,806,954 Allowance for credit losses on loans (234,613) (211,866) Total loans held for investment, net $ 19,553,168 $ 22,595,088 Loans held for sale: Insurance premium finance loans, at lower of cost or fair value (2) $ 3,137,791 $ — Mortgage loans, at fair value 4,387 8,123 Total loans held for sale $ 3,142,178 $ 8,123 (1) Excludes accrued interest receivable of $71.8 million and $50.9 million at September 30, 2022 and December 31, 2021, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets. (2) September 30, 2022 includes $1.3 million in non-accrual loans and $3.1 million in loans past due 90 days and still accruing that were transferred from loans held for investment to loans held for sale as of September 30, 2022. The following tables summarize our gross loans held for investment by year of origination and internally assigned credit grades: (in thousands) 2022 2021 2020 2019 2018 2017 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total September 30, 2022 Commercial (1-7) Pass $ 1,530,588 $ 776,714 $ 252,321 $ 366,245 $ 225,307 $ 316,001 $ 5,004,072 $ 27,344 $ 8,498,592 (8) Special mention 28,302 38,477 6,398 37,809 7,526 5,769 35,967 3,820 164,068 (9) Substandard - accruing — 42,148 315 30,647 15,133 6,365 28,378 — 122,986 (9+) Non-accrual 7,622 602 — 36 9,947 6,875 2,886 — 27,968 Total commercial $ 1,566,512 $ 857,941 $ 259,034 $ 434,737 $ 257,913 $ 335,010 $ 5,071,303 $ 31,164 $ 8,813,614 Energy (1-7) Pass $ 129,764 $ 23,517 $ — $ — $ 20,000 $ 5,743 $ 912,936 $ — $ 1,091,960 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — 7,637 — 7,637 (9+) Non-accrual — — — — — — 6,500 — 6,500 Total energy $ 129,764 $ 23,517 $ — $ — $ 20,000 $ 5,743 $ 927,073 $ — $ 1,106,097 Mortgage finance (1-7) Pass $ 7,913 $ 457,792 $ 196,598 $ 393,675 $ 555,480 $ 3,292,412 $ — $ — $ 4,903,870 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — 1,464 3,488 — — 4,952 (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 7,913 $ 457,792 $ 196,598 $ 393,675 $ 556,944 $ 3,295,900 $ — $ — $ 4,908,822 Real estate CRE (1-7) Pass $ 800,519 $ 611,459 $ 657,829 $ 487,368 $ 183,225 $ 366,644 $ 60,672 $ 15,969 $ 3,183,685 (8) Special mention 2,396 7,249 7,940 5,297 33,454 22,063 — — 78,399 (9) Substandard - accruing — 17,850 — — 11,522 18,629 — — 48,001 (9+) Non-accrual — — — — — 187 — — 187 RBF (1-7) Pass 82,515 85,477 19,560 13,915 7,462 1,162 390,476 — 600,567 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 129,406 137,275 103,917 79,637 79,984 170,709 39,074 27,316 767,318 (8) Special mention — — 10,711 — — 10,099 — — 20,810 (9) Substandard - accruing — — — — — 1,058 — — 1,058 (9+) Non-accrual — — 1,081 — — — — — 1,081 Secured by 1-4 family (1-7) Pass 45,887 90,434 55,261 26,854 19,439 72,329 4,056 — 314,260 (8) Special mention — — — — — 44 — — 44 (9) Substandard - accruing — — — — — 166 — — 166 (9+) Non-accrual — — — — — 128 — — 128 Total real estate $ 1,060,723 $ 949,744 $ 856,299 $ 613,071 $ 335,086 $ 663,218 $ 494,278 $ 43,285 $ 5,015,704 Total $ 2,764,912 $ 2,288,994 $ 1,311,931 $ 1,441,483 $ 1,169,943 $ 4,299,871 $ 6,492,654 $ 74,449 $ 19,844,237 (in thousands) 2021 2020 2019 2018 2017 2016 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total December 31, 2021 Commercial (1-7) Pass $ 1,133,013 $ 3,157,150 $ 546,520 $ 319,246 $ 200,478 $ 289,795 $ 3,960,706 $ 41,377 $ 9,648,285 (8) Special mention 2,650 5,277 23,129 8,697 39 5,322 5,120 7,883 58,117 (9) Substandard - accruing — 7,705 102,619 25,010 6,202 6,962 14,742 2,007 165,247 (9+) Non-accrual 736 1,191 49 12,955 1,166 6,196 3,619 — 25,912 Total commercial $ 1,136,399 $ 3,171,323 $ 672,317 $ 365,908 $ 207,885 $ 308,275 $ 3,984,187 $ 51,267 $ 9,897,561 Energy (1-7) Pass $ 71,750 $ — $ — $ 3 $ — $ 7,188 $ 577,988 $ — $ 656,929 (8) Special mention — — — — — — 27,421 — 27,421 (9) Substandard - accruing — — — — — 8,643 — — 8,643 (9+) Non-accrual — — — — — — 28,380 — 28,380 Total energy $ 71,750 $ — $ — $ 3 $ — $ 15,831 $ 633,789 $ — $ 721,373 Mortgage finance (1-7) Pass $ 289,042 $ 590,616 $ 656,445 $ 754,507 $ 332,001 $ 4,852,886 $ — $ — $ 7,475,497 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 289,042 $ 590,616 $ 656,445 $ 754,507 $ 332,001 $ 4,852,886 $ — $ — $ 7,475,497 Real estate CRE (1-7) Pass $ 497,462 $ 576,344 $ 600,005 $ 294,005 $ 155,252 $ 451,042 $ 73,988 $ 25,970 $ 2,674,068 (8) Special mention — — 291 8,827 20,089 26,344 — — 55,551 (9) Substandard - accruing 17,850 — — 40,900 37,393 38,188 — 2,308 136,639 (9+) Non-accrual — — — — — 198 — — 198 RBF (1-7) Pass 155,595 44,362 9,693 8,565 — 12,732 460,888 — 691,835 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 166,202 148,811 119,017 106,343 61,723 139,723 47,653 29,595 819,067 (8) Special mention — 7,365 — — 845 4,982 — — 13,192 (9) Substandard - accruing — 6,424 — — 16,922 20,184 — — 43,530 (9+) Non-accrual — — — — 2,641 1,450 — 13,741 17,832 Secured by 1-4 family (1-7) Pass 96,899 60,659 40,586 22,976 31,826 65,910 4,535 — 323,391 (8) Special mention — 553 — — — 291 — — 844 (9) Substandard - accruing — — — — — 1,203 — — 1,203 (9+) Non-accrual — — — — — 180 — — 180 Total real estate $ 934,008 $ 844,518 $ 769,592 $ 481,616 $ 326,691 $ 762,427 $ 587,064 $ 71,614 $ 4,777,530 Total $ 2,431,199 $ 4,606,457 $ 2,098,354 $ 1,602,034 $ 866,577 $ 5,939,419 $ 5,205,040 $ 122,881 $ 22,871,961 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 Nine months ended September 30, 2022 Beginning balance $ 102,202 $ 52,568 $ 6,083 $ 51,013 $ 211,866 Provision for credit losses on loans 31,257 (18,636) 4,073 10,923 27,617 Charge-offs 3,210 2,903 — 350 6,463 Recoveries 549 1,044 — — 1,593 Net charge-offs (recoveries) 2,661 1,859 — 350 4,870 Ending balance $ 130,798 $ 32,073 $ 10,156 $ 61,586 $ 234,613 Nine months ended September 30, 2021 Beginning balance $ 73,061 $ 84,064 $ 4,699 $ 92,791 $ 254,615 Provision for credit losses on loans 26,549 (24,730) 1,729 (24,325) (20,777) Charge-offs 8,211 6,418 — 1,192 15,821 Recoveries 2,462 1,366 — 112 3,940 Net charge-offs (recoveries) 5,749 5,052 — 1,080 11,881 Ending balance $ 93,861 $ 54,282 $ 6,428 $ 67,386 $ 221,957 We recorded a $32.0 million provision for credit losses for the nine months ended September 30, 2022, compared to a negative provision of $20.0 million for the same period in 2021. The $32.0 million provision for credit losses resulted primarily from updated views on the downside risks to the economic forecast, partially offset by a decline in criticized loans. We recorded $4.9 million in net charge-offs during the nine months ended September 30, 2022, compared to net charge-offs of $11.9 million during the same period in 2021. Criticized loans totaled $484.0 million at September 30, 2022, compared to $582.9 million and $728.9 million at December 31, 2021 and September 30, 2021, respectively. The decrease in criticized loans as compared to June 30, 2022 was primarily due to the resolution of one mortgage finance credit that was downgraded in the second quarter of 2022 and resolved in the third quarter of 2022 with no losses recorded. The table below provides an age analysis of our gross loans held for investment: (in thousands) 30-59 Days 60-89 Days 90 Days or More Past Due Total Past Non-Accrual Loans(1) Current Total Non-Accrual With No Allowance September 30, 2022 Commercial $ 10,405 $ 151 $ 30,602 $ 41,158 $ 27,968 $ 8,744,488 $ 8,813,614 $ 3,637 Energy — — — — 6,500 1,099,597 1,106,097 — Mortgage finance — — — — — 4,908,822 4,908,822 — Real estate: CRE 52 — — 52 187 3,310,033 3,310,272 — RBF — — — — — 600,567 600,567 — Other 700 2,453 — 3,153 1,081 786,033 790,267 — Secured by 1-4 family — — 62 62 128 314,408 314,598 — Total $ 11,157 $ 2,604 $ 30,664 $ 44,425 $ 35,864 $ 19,763,948 $ 19,844,237 $ 3,637 (3) As of September 30, 2022 and December 31, 2021, $1.8 million of our non-accrual loans were earning interest income on a cash basis. Additionally, $801,000 in interest income was recognized on non-accrual loans for the nine months ended September 30, 2022. Accrued interest of $100,000 was reversed during the nine months ended September 30, 2022. The following table details the recorded investment of loans restructured during the nine months ended September 30, 2022: Extended Maturity Adjusted Payment Schedule Total (in thousands, except number of contracts) Number of Contracts Balance at Period End Number of Contracts Balance at Period End Number of Contracts Balance at Period End Nine months ended September 30, 2022 Commercial loans — $ — 1 $ 604 1 $ 604 Total — $ — 1 $ 604 1 $ 604 We did not have any loans that were restructured during the nine months ended September 30, 2021. The restructuring of the loans did not have a significant impact on our allowance for credit losses at September 30, 2022. As of September 30, 2022 and 2021, we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

Short-term Borrowings and Long-

Short-term Borrowings and Long-term Debt	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Short-term Borrowings and Long-term Debt	Short-term Borrowings and Long-term Debt The table below presents a summary of short-term borrowings: (in thousands) September 30, 2022 December 31, 2021 Customer repurchase agreements $ 1,480 $ 2,832 Federal Home Loan Bank borrowings 1,700,000 2,200,000 Total short-term borrowings $ 1,701,480 $ 2,202,832 The table below presents a summary of long-term debt: (in thousands) September 30, 2022 December 31, 2021 Bank-issued floating rate senior unsecured credit-linked notes due 2024 $ 271,991 $ 270,487 Bank-issued 5.25% fixed rate subordinated notes due 2026 174,131 173,935 Company-issued 4.00% fixed rate subordinated notes due 2031 371,238 370,910 Trust preferred floating rate subordinated debentures due 2032 to 2036 113,406 113,406 Total long-term debt $ 930,766 $ 928,738

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	9 Months Ended
	Sep. 30, 2022
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 September 30, Nine months ended September 30, (in thousands) 2022 2021 2022 2021 Beginning balance of allowance for off-balance sheet credit losses $ 17,981 $ 16,747 $ 17,265 $ 17,434 Provision for off-balance sheet credit losses 3,667 1,464 4,383 777 Ending balance of allowance for off-balance sheet credit losses $ 21,648 $ 18,211 $ 21,648 $ 18,211 (in thousands) September 30, 2022 December 31, 2021 Commitments to extend credit - period end balance $ 9,182,739 $ 9,445,763 Standby letters of credit - period end balance 419,828 357,672

Regulatory Restrictions

Regulatory Restrictions	9 Months Ended
	Sep. 30, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Restrictions	Regulatory Ratios and Capital 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. No dividends were declared or paid on our common stock during the nine months ended September 30, 2022 or during the year ended December 31, 2021. On April 19, 2022, our board of directors authorized a share repurchase program under which we may repurchase up to $150.0 million in shares of our outstanding common stock. During the nine months ended September 30, 2022, the Company repurchased 941,879 shares of its common stock for an aggregate price of $50.0 million, at a weighted average price of $53.11 per share. 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 September 30, 2022, that the Company and the Bank meet all capital adequacy requirements to which they are subject. Financial institutions are categorized as well capitalized based on total risk-based, Tier 1 risk-based, CET1 and Tier 1 leverage ratios. As shown in the table below, the Company’s and the Bank’s capital ratios exceeded the regulatory definition of well capitalized as of September 30, 2022 and December 31, 2021. The regulatory authorities can apply changes in classification of assets and such changes may retroactively subject the Company and the Bank 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 financial 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(2) Capital Required to be Well Capitalized (dollars in thousands) Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio September 30, 2022 CET1 Company $ 3,011,505 11.08 % $ 1,902,047 7.00 % N/A N/A Bank 3,175,750 11.70 % 1,899,579 7.00 % 1,763,895 6.50 % Total capital (to risk-weighted assets) Company 4,143,219 15.25 % 2,853,071 10.50 % 2,717,210 10.00 % Bank 3,736,226 13.77 % 2,849,369 10.50 % 2,713,685 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,421,505 12.59 % 2,309,629 8.50 % 1,630,326 6.00 % Bank 3,335,750 12.29 % 2,306,632 8.50 % 2,170,948 8.00 % Tier 1 capital (to average assets)(1) Company 3,421,505 10.67 % 1,282,691 4.00 % N/A N/A Bank 3,335,750 10.41 % 1,281,909 4.00 % 1,602,386 5.00 % December 31, 2021 CET1 Company $ 2,949,785 11.06 % $ 1,866,444 7.00 % N/A N/A Bank 3,013,170 11.30 % 1,866,303 7.00 % 1,732,996 6.50 % Total capital (to risk-weighted assets) Company 4,085,540 15.32 % 2,799,666 10.50 % 2,666,348 10.00 % Bank 3,578,014 13.42 % 2,799,455 10.50 % 2,666,148 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,359,785 12.60 % 2,266,396 8.50 % 1,599,809 6.00 % Bank 3,173,170 11.90 % 2,266,225 8.50 % 2,132,918 8.00 % Tier 1 capital (to average assets)(1) Company 3,359,785 9.01 % 1,490,902 4.00 % N/A N/A Bank 3,173,170 8.51 % 1,490,677 4.00 % 1,863,346 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. (2) Percentages represent the minimum capital ratios plus the fully phased-in 2.5% CET1 capital buffer under the Basel III Capital Rules.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2022
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 Company’s 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, restricted stock units (“RSUs”), restricted stock and performance units, or any combination thereof. On April 19, 2022, the Company’s stockholders approved the Texas Capital Bancshares, Inc. 2022 Long-Term Incentive Plan, which provides for the issuance of 1,124,880 shares of common stock for compensation to the Company’s key employees and non-employee directors. The table below summarizes our stock-based compensation expense: Three months ended September 30, Nine months ended September 30, (in thousands) 2022 2021 2022 2021 Stock-settled awards: RSUs $ 5,376 $ 8,324 $ 15,805 $ 22,099 Restricted stock — — — 1 Cash-settled units 3 64 186 1,092 Total $ 5,379 $ 8,388 $ 15,991 $ 23,192 (in thousands except period data) September 30, 2022 Unrecognized compensation expense related to unvested stock-settled awards $ 37,492 Weighted average period over which expense is expected to be recognized, in years 2.4

Fair Value Disclosures

Fair Value Disclosures	9 Months Ended
	Sep. 30, 2022
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 the Accounting Standards Codification (“ASC”) 820, Fair Value Measurement . See Note 1 - Operations and Summary of Significant Accounting Policies in our 2021 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 September 30, 2022 Available-for-sale debt securities:(1) U.S. Treasury securities $ 637,281 $ — $ — U.S. government agency securities — 101,690 — Residential mortgage-backed securities — 1,630,101 — CRT securities — — 11,702 Equity securities(1)(2) 21,932 11,041 — Mortgage loans held for sale(3) — — 4,387 Derivative assets(4) — 24,093 — Derivative liabilities(4) — 108,608 — Non-qualified deferred compensation plan liabilities(5) 20,028 — — December 31, 2021 Available-for-sale debt securities:(1) U.S. government agency securities $ — $ 120,944 $ — Residential mortgage-backed securities — 3,225,378 — Tax-exempt asset-backed securities — — 180,033 CRT securities — — 11,846 Equity securities(1)(2) 33,589 12,018 — Mortgage loans held for sale(3) — 465 7,658 Derivative assets(4) — 37,788 — Derivative liabilities(4) — 37,788 — Non-qualified deferred compensation plan liabilities(5) 29,695 — — (1) Investment 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 investments that qualify for consideration under the regulations implementing the Community Reinvestment Act and investments related to our non-qualified deferred compensation plan. (3) Mortgage loans held for sale are measured at fair value on a recurring basis, generally monthly. (4) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly. (5) 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 summarizes the changes in Level 3 assets measured at fair value on a recurring basis: Net Gains (Losses) (in thousands) Balance at Beginning of Period Purchases / Additions Sales / Reductions Realized Unrealized Balance at End of Period Three months ended September 30, 2022 Available-for-sale debt securities:(1) CRT securities $ 11,670 $ — $ — $ — $ 32 $ 11,702 Loans held for sale(2) 4,266 571 (450) — — 4,387 Three months ended September 30, 2021 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 185,954 $ — $ (2,270) $ — $ 1,136 $ 184,820 CRT securities 11,713 — — — 91 11,804 Loans held for sale(2) 8,227 440 (870) — (96) 7,701 Nine months ended September 30, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 180,033 $ — $ (170,626) $ — $ (9,407) $ — CRT securities 11,846 — — — (144) 11,702 Loans held for sale(2) 7,658 1,898 (5,050) — (119) 4,387 Nine months ended September 30, 2021 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 199,176 $ — $ (13,783) $ — $ (573) $ 184,820 CRT securities 11,417 — — — 387 11,804 Loans held for sale(2) 6,933 2,125 (1,395) 5 33 7,701 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI. Realized gains/(losses) are recorded in other non-interest income on the consolidated statements of income and other comprehensive income/(loss). (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in net gain/(loss) on sale of loans held for sale on the consolidated statements of income and other comprehensive income/(loss). 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 a weighted-average life. The securities were redeemed in full prior to September 30, 2022. At December 31, 2021, the combined weighted-average discount rate and weighted-average life utilized were 2.60% and 4.61 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 a weighted-average life. At September 30, 2022, the discount rates utilized ranged from 6.97% to 11.52% and the weighted-average life ranged from 5.23 years to 8.93 years. On a combined amortized cost weighted-average basis, a discount rate of 8.49% and a weighted-average life of 6.46 years were utilized to determine the fair value of these securities at September 30, 2022. At December 31, 2021, the combined weighted-average discount rate and combined weighted-average life utilized were 4.97% and 6.35 years, respectively. Mortgage loans held for sale The fair value of mortgage 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 September 30, 2022, the fair value of these loans was calculated using a weighted-average discounted price of 90.4%, compared to 97.8% at December 31, 2021. Fair Value of Financial Instruments A summary of the carrying amounts and estimated fair values of financial instruments is as follows: Estimated Fair Value (in thousands) Carrying Total Level 1 Level 2 Level 3 September 30, 2022 Financial assets: Cash and cash equivalents $ 3,640,247 $ 3,640,247 $ 3,640,247 $ — $ — Available-for-sale debt securities 2,380,774 2,380,774 637,281 1,731,791 11,702 Held-to-maturity debt securities 955,875 819,701 — 819,701 — Equity securities 32,973 32,973 21,932 11,041 — Loans held for sale 3,142,178 3,113,806 — — 3,113,806 Loans held for investment, net 19,553,168 19,472,586 — — 19,472,586 Derivative assets 24,093 24,093 — 24,093 — Financial liabilities: Total deposits 24,498,563 24,502,640 — — 24,502,640 Short-term borrowings 1,701,480 1,701,480 — 1,701,480 — Long-term debt 930,766 873,342 — 873,342 — Derivative liabilities 108,608 108,608 — 108,608 — December 31, 2021 Financial assets: Cash and cash equivalents $ 7,946,659 $ 7,946,659 $ 7,946,659 $ — $ — Available-for-sale debt securities 3,538,201 3,538,201 — 3,346,322 191,879 Equity securities 45,607 45,607 33,589 12,018 — Loans held for sale 8,123 8,123 — 465 7,658 Loans held for investment, net 22,595,088 22,631,252 — — 22,631,252 Derivative assets 37,788 37,788 — 37,788 — Financial liabilities: Total deposits 28,109,365 28,109,762 — — 28,109,762 Short-term borrowings 2,202,832 2,202,832 — 2,202,832 — Long-term debt 928,738 952,404 — 952,404 — Derivative liabilities 37,788 37,788 — 37,788 —

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2022
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. September 30, 2022 December 31, 2021 Estimated Fair Value Estimated Fair Value (in thousands) Notional Asset Derivative Liability Derivative Notional Asset Derivative Liability Derivative Derivatives designated as hedges Cash flow hedges: Interest rate contracts: Swaps hedging loans $ 3,000,000 $ 357 $ 80,135 $ — $ — $ — Non-hedging derivatives Customer-initiated and other derivatives: Interest rate contracts: Swaps 3,989,586 86,138 86,138 3,536,090 40,922 40,922 Caps and floors written 130,415 — 1,489 191,291 94 — Caps and floors purchased 130,415 1,489 — 191,291 — 94 Forward contracts 1,025,581 12,536 12,429 — — — Gross derivatives 100,520 180,191 41,016 41,016 Netting adjustment - offsetting derivative assets/liabilities (2,476) (2,476) (3,228) (3,228) Netting adjustment - cash collateral received/posted (73,951) (69,107) — — Net derivatives included on the consolidated balance sheets $ 24,093 $ 108,608 $ 37,788 $ 37,788 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 $24.1 million at September 30, 2022, and approximately $37.8 million at December 31, 2021. Collateral levels are monitored and adjusted on a regular basis for changes in the value of derivative instruments. At September 30, 2022, we had $73.0 million in cash collateral pledged to counterparties included in interest-bearing cash and cash equivalents on the consolidated balance sheet and $74.0 million in cash collateral received from counterparties included in interest bearing deposits on the consolidated balance sheet. The comparative amounts at December 31, 2021, were $40.3 million in cash collateral pledged to counterparties and no cash collateral received from counterparties. 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 18 risk participation agreements where we are a participant bank with a notional amount of $343.3 million at September 30, 2022, compared to seven risk participation agreements with a notional amount of $79.2 million at December 31, 2021. The maximum estimated exposure to these agreements, assuming 100% default by all obligors, was approximately $10.4 million at September 30, 2022 and $2.3 million at December 31, 2021. The fair value of these exposures was insignificant to the consolidated financial statements at both September 30, 2022 and December 31, 2021. 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 17 risk participation agreements where we are the lead bank with a notional amount of $201.1 million at September 30, 2022, compared to 15 agreements with a notional amount of $156.1 million at December 31, 2021. Derivatives Designated as Cash Flow Hedges During the nine months ended September 30, 2022, we entered into interest rate derivative contracts that were designated as qualifying cash flow hedges to hedge the exposure to variability in expected future cash flows attributable to changes in a contractually specified interest rate. To qualify for hedge accounting, a formal assessment is prepared to determine whether the hedging relationship, both at inception and on an ongoing basis, is expected to be highly effective in achieving offsetting cash flows attributable to the hedged risk during the term of the hedge if a cash flow hedge. At inception a statistical regression analysis is prepared to determine hedge effectiveness. At each reporting period thereafter, a statistical regression or qualitative analysis is performed. If it is determined that hedge effectiveness has not been or will not continue to be highly effective, then hedge accounting ceases and any gain or loss in AOCI is recognized in earnings immediately. The cash flow hedges are recorded at fair value in other assets and other liabilities on the consolidated balance sheets with changes in fair value recorded in AOCI, net of tax. Amounts recorded to AOCI are reclassified into earnings in the same period in which the hedged asset or liability affects earnings and are presented in the same income statement line item as the earnings effect of the hedged asset or liability. During the three and nine months ended September 30, 2022, we recorded $78.2 million and $77.9 million, respectively, in unrealized losses to adjust our cash flow hedges to fair value, which was recorded net of tax to AOCI, and reclassified $1.8 million and $2.5 million, respectively, from AOCI into interest income on loans. Based on current market conditions, we estimate that during the next 12 months, an additional $31.7 million will be reclassified from AOCI as a decrease to interest income. As of September 30, 2022, the maximum length of time over which forecasted transactions are hedged is 4.00 years.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2022
Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table provides the change in AOCI by component: (in thousands) Cash Flow Hedges Available-for-Sale Securities Held-to-Maturity Securities Total Three months ended September 30, 2022 Beginning balance $ (316) $ (220,090) $ (51,802) $ (272,208) Change in unrealized gain/(loss) (78,177) (129,027) — (207,204) Amounts reclassified into net income (1,760) — 2,369 609 Total other comprehensive income/(loss) (79,937) (129,027) 2,369 (206,595) Income tax expense/(benefit) (16,786) (27,095) 497 (43,384) Total other comprehensive income/(loss), net of tax (63,151) (101,932) 1,872 (163,211) Ending balance $ (63,467) $ (322,022) $ (49,930) $ (435,419) Three months ended September 30, 2021 Beginning balance $ — $ (26,389) $ — $ (26,389) Change in unrealized gain/(loss) — (18,131) — (18,131) Amounts reclassified into net income — — — — Total other comprehensive income/(loss) — (18,131) — (18,131) Income tax expense/(benefit) — (3,808) — (3,808) Total other comprehensive income/(loss), net of tax — (14,323) — (14,323) Ending balance $ — $ (40,712) $ — $ (40,712) Nine months ended September 30, 2022 Beginning balance $ — $ (47,715) $ — $ (47,715) Change in unrealized gain/(loss) (77,873) (347,223) (69,165) (494,261) Amounts reclassified into net income (2,464) — 5,962 3,498 Total other comprehensive income/(loss) (80,337) (347,223) (63,203) (490,763) Income tax expense/(benefit) (16,870) (72,916) (13,273) (103,059) Total other comprehensive income/(loss), net of tax (63,467) (274,307) (49,930) (387,704) Ending balance $ (63,467) $ (322,022) $ (49,930) $ (435,419) Nine months ended September 30, 2021 Beginning balance $ — $ 15,774 $ — $ 15,774 Change in unrealized gain/(loss) — (71,501) — (71,501) Amounts reclassified into net income — — — — Total other comprehensive income/(loss) — (71,501) — (71,501) Income tax expense/(benefit) — (15,015) — (15,015) Total other comprehensive income/(loss), net of tax — (56,486) — (56,486) Ending balance $ — $ (40,712) $ — $ (40,712)

Operations and Summary of Sig_2

Operations and Summary of Significant Accounting Policies Operations and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization And Nature Of Business	Organization and Nature of Business Texas Capital Bancshares, Inc. (“we,” “us”, or the “Company”), 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 the Company and its wholly owned subsidiary, Texas Capital Bank (the “Bank”). We serve the needs of commercial businesses and 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 in or with operations in Texas. Our national lines of business provide specialized lending products to businesses throughout the United States. On September 6, 2022, we announced the sale of BankDirect Capital Finance (“BDCF” or “disposal group”), our insurance premium finance subsidiary, to AFCO Credit Corporation, an indirect wholly-owned subsidiary of Truist Financial Corp. The sale of BDCF includes its business operations and loan portfolio of approximately $3.1 billion as of September 30, 2022. The sale is an all-cash transaction for a purchase price of approximately $3.4 billion, representing an 8.5% asset premium compared to the value of the purchased loan portfolio as of September 30, 2022. The transaction resulted in the recognition of a disposal group that is classified as held for sale but does not meet the criteria for discontinued operations reporting. As such, the loans, assets and liabilities related to the disposal group were transferred at the lower of cost or fair value to loans held for sale, other assets held for sale and other liabilities held for sale, respectively, on the consolidated balance sheet as of September 30, 2022. The pre-tax net income for the disposal group for the three months ended September 30, 2022 and 2021 was $11.9 million and $17.4 million, respectively, and was $49.5 million and $48.7 million for the nine months ended September 30, 2022 and 2021, respectively. The sale is expected to close in the fourth quarter of 2022, subject to various customary closing conditions.
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 disclosures in the notes to consolidated unaudited financial statements that are 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 present a fair presentation of our financial position and results of operations. 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 U.S. Securities and Exchange Commission (“SEC”). Accordingly, the financial statements and the notes to the consolidated unaudited financial statements required by GAAP for complete annual financial statements do not include all of the information and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2021, included in our Annual Report on Form 10-K for the year ended December 31, 2021 (the “2021 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.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2022
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 September 30, Nine months ended September 30, (in thousands except share and per share data) 2022 2021 2022 2021 Numerator: Net income $ 41,418 $ 43,390 $ 115,227 $ 188,809 Preferred stock dividends 4,313 4,312 12,938 14,408 Net income available to common stockholders $ 37,105 $ 39,078 $ 102,289 $ 174,401 Denominator: Denominator for basic earnings per common share—weighted average common shares 49,891,727 50,600,732 50,506,364 50,568,439 Effect of dilutive outstanding stock-settled awards 526,157 538,823 584,151 555,836 Denominator for dilutive earnings per common share—weighted average diluted common shares 50,417,884 51,139,555 51,090,515 51,124,275 Basic earnings per common share $ 0.74 $ 0.77 $ 2.03 $ 3.45 Diluted earnings per common share $ 0.74 $ 0.76 $ 2.00 $ 3.41 Anti-dilutive outstanding stock-settled awards 174,706 208,813 315,499 104,174

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Summary of securities	The following is a summary of our investment securities: (in thousands) Amortized Gross Gross Estimated September 30, 2022 Available-for-sale debt securities: U.S. Treasury securities $ 668,093 $ — $ (30,812) $ 637,281 U.S. government agency securities 125,000 — (23,310) 101,690 Residential mortgage-backed securities 1,980,590 7 (350,496) 1,630,101 Credit risk transfer (“CRT”) securities 14,713 — (3,011) 11,702 Total available-for-sale debt securities 2,788,396 7 (407,629) 2,380,774 Held-to-maturity debt securities: Residential mortgage-backed securities 955,875 — (136,174) 819,701 Total held-to-maturity debt securities 955,875 — (136,174) 819,701 Equity securities 32,973 Total investment securities(2) $ 3,369,622 December 31, 2021 Available-for-sale debt securities: U.S. government agency securities $ 125,000 $ — $ (4,056) $ 120,944 Residential mortgage-backed securities 3,288,261 156 (63,039) 3,225,378 Tax-exempt asset-backed securities 170,626 9,407 — 180,033 CRT securities 14,713 — (2,867) 11,846 Total available-for-sale debt securities 3,598,600 9,563 (69,962) 3,538,201 Equity securities 45,607 Total investment securities(2) $ 3,583,808 (1) Excludes accrued interest receivable of $4.2 million and $6.6 million at September 30, 2022 and December 31, 2021, respectively, related to available-for-sale debt securities, and $1.5 million at September 30, 2022 related to held-to-maturity debt securities that is recorded in accrued interest receivable and other assets on the consolidated balance sheets. (2) Includes available-for-sale debt securities and equity securities at estimated fair value and held-to-maturity debt securities at amortized cost.
Schedule of amortized cost and estimated fair value of securities	The amortized cost and estimated fair value as of September 30, 2022, excluding accrued interest receivable, of available-for-sale and held-to-maturity debt securities are presented below by contractual maturity. Actual maturities may differ from contractual maturities of mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. Available-for-Sale Held-to-Maturity (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 41 $ 41 $ — $ — Due after one year through five years 668,093 637,281 — — Due after five years through ten years 156,587 127,368 — — Due after ten years 1,963,675 1,616,084 955,875 819,701 Total $ 2,788,396 $ 2,380,774 $ 955,875 $ 819,701
Debt Securities, Available-for-sale, 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 September 30, 2022 U.S. treasury securities $ 637,281 $ (30,812) $ — $ — $ 637,281 $ (30,812) U.S. government agency securities — — 101,690 (23,310) 101,690 (23,310) Residential mortgage-backed securities 310,838 (67,167) 1,318,654 (283,329) 1,629,492 (350,496) CRT securities — — 11,702 (3,011) 11,702 (3,011) Total $ 948,119 $ (97,979) $ 1,432,046 $ (309,650) $ 2,380,165 $ (407,629) December 31, 2021 U.S. government agency securities $ 24,085 $ (915) $ 96,859 $ (3,141) $ 120,944 $ (4,056) Residential mortgage-backed securities 2,871,052 (50,721) 303,491 (12,318) 3,174,543 (63,039) CRT securities — — 11,846 (2,867) 11,846 (2,867) Total $ 2,895,137 $ (51,636) $ 412,196 $ (18,326) $ 3,307,333 $ (69,962)
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 on the consolidated statements of income and other comprehensive income/(loss): Three months ended September 30, Nine months ended September 30, (in thousands) 2022 2021 2022 2021 Net gains/(losses) recognized during the period $ (1,165) $ 850 $ (9,801) $ 4,496 Less: Realized net gains/(losses) recognized on securities sold (587) 347 (589) 1,096 Unrealized net gains/(losses) recognized on securities held $ (578) $ 503 $ (9,212) $ 3,400

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	9 Months Ended
	Sep. 30, 2022
Receivables [Abstract]
Schedule of loans held for investments	Loans are summarized by portfolio segment as follows: (in thousands) September 30, 2022 December 31, 2021 Loans held for investment(1): Commercial $ 8,813,614 $ 9,897,561 Energy 1,106,097 721,373 Mortgage finance 4,908,822 7,475,497 Real estate 5,015,704 4,777,530 Gross loans held for investment 19,844,237 22,871,961 Unearned income (net of direct origination costs) (56,456) (65,007) Total loans held for investment 19,787,781 22,806,954 Allowance for credit losses on loans (234,613) (211,866) Total loans held for investment, net $ 19,553,168 $ 22,595,088 Loans held for sale: Insurance premium finance loans, at lower of cost or fair value (2) $ 3,137,791 $ — Mortgage loans, at fair value 4,387 8,123 Total loans held for sale $ 3,142,178 $ 8,123 (1) Excludes accrued interest receivable of $71.8 million and $50.9 million at September 30, 2022 and December 31, 2021, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets. (2) September 30, 2022 includes $1.3 million in non-accrual loans and $3.1 million in loans past due 90 days and still accruing that were transferred from loans held for investment to loans held for sale as of September 30, 2022.
Schedule of the credit risk profile of loan portfolio by internally assigned grades and nonaccrual status	The following tables summarize our gross loans held for investment by year of origination and internally assigned credit grades: (in thousands) 2022 2021 2020 2019 2018 2017 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total September 30, 2022 Commercial (1-7) Pass $ 1,530,588 $ 776,714 $ 252,321 $ 366,245 $ 225,307 $ 316,001 $ 5,004,072 $ 27,344 $ 8,498,592 (8) Special mention 28,302 38,477 6,398 37,809 7,526 5,769 35,967 3,820 164,068 (9) Substandard - accruing — 42,148 315 30,647 15,133 6,365 28,378 — 122,986 (9+) Non-accrual 7,622 602 — 36 9,947 6,875 2,886 — 27,968 Total commercial $ 1,566,512 $ 857,941 $ 259,034 $ 434,737 $ 257,913 $ 335,010 $ 5,071,303 $ 31,164 $ 8,813,614 Energy (1-7) Pass $ 129,764 $ 23,517 $ — $ — $ 20,000 $ 5,743 $ 912,936 $ — $ 1,091,960 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — 7,637 — 7,637 (9+) Non-accrual — — — — — — 6,500 — 6,500 Total energy $ 129,764 $ 23,517 $ — $ — $ 20,000 $ 5,743 $ 927,073 $ — $ 1,106,097 Mortgage finance (1-7) Pass $ 7,913 $ 457,792 $ 196,598 $ 393,675 $ 555,480 $ 3,292,412 $ — $ — $ 4,903,870 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — 1,464 3,488 — — 4,952 (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 7,913 $ 457,792 $ 196,598 $ 393,675 $ 556,944 $ 3,295,900 $ — $ — $ 4,908,822 Real estate CRE (1-7) Pass $ 800,519 $ 611,459 $ 657,829 $ 487,368 $ 183,225 $ 366,644 $ 60,672 $ 15,969 $ 3,183,685 (8) Special mention 2,396 7,249 7,940 5,297 33,454 22,063 — — 78,399 (9) Substandard - accruing — 17,850 — — 11,522 18,629 — — 48,001 (9+) Non-accrual — — — — — 187 — — 187 RBF (1-7) Pass 82,515 85,477 19,560 13,915 7,462 1,162 390,476 — 600,567 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 129,406 137,275 103,917 79,637 79,984 170,709 39,074 27,316 767,318 (8) Special mention — — 10,711 — — 10,099 — — 20,810 (9) Substandard - accruing — — — — — 1,058 — — 1,058 (9+) Non-accrual — — 1,081 — — — — — 1,081 Secured by 1-4 family (1-7) Pass 45,887 90,434 55,261 26,854 19,439 72,329 4,056 — 314,260 (8) Special mention — — — — — 44 — — 44 (9) Substandard - accruing — — — — — 166 — — 166 (9+) Non-accrual — — — — — 128 — — 128 Total real estate $ 1,060,723 $ 949,744 $ 856,299 $ 613,071 $ 335,086 $ 663,218 $ 494,278 $ 43,285 $ 5,015,704 Total $ 2,764,912 $ 2,288,994 $ 1,311,931 $ 1,441,483 $ 1,169,943 $ 4,299,871 $ 6,492,654 $ 74,449 $ 19,844,237 (in thousands) 2021 2020 2019 2018 2017 2016 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total December 31, 2021 Commercial (1-7) Pass $ 1,133,013 $ 3,157,150 $ 546,520 $ 319,246 $ 200,478 $ 289,795 $ 3,960,706 $ 41,377 $ 9,648,285 (8) Special mention 2,650 5,277 23,129 8,697 39 5,322 5,120 7,883 58,117 (9) Substandard - accruing — 7,705 102,619 25,010 6,202 6,962 14,742 2,007 165,247 (9+) Non-accrual 736 1,191 49 12,955 1,166 6,196 3,619 — 25,912 Total commercial $ 1,136,399 $ 3,171,323 $ 672,317 $ 365,908 $ 207,885 $ 308,275 $ 3,984,187 $ 51,267 $ 9,897,561 Energy (1-7) Pass $ 71,750 $ — $ — $ 3 $ — $ 7,188 $ 577,988 $ — $ 656,929 (8) Special mention — — — — — — 27,421 — 27,421 (9) Substandard - accruing — — — — — 8,643 — — 8,643 (9+) Non-accrual — — — — — — 28,380 — 28,380 Total energy $ 71,750 $ — $ — $ 3 $ — $ 15,831 $ 633,789 $ — $ 721,373 Mortgage finance (1-7) Pass $ 289,042 $ 590,616 $ 656,445 $ 754,507 $ 332,001 $ 4,852,886 $ — $ — $ 7,475,497 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 289,042 $ 590,616 $ 656,445 $ 754,507 $ 332,001 $ 4,852,886 $ — $ — $ 7,475,497 Real estate CRE (1-7) Pass $ 497,462 $ 576,344 $ 600,005 $ 294,005 $ 155,252 $ 451,042 $ 73,988 $ 25,970 $ 2,674,068 (8) Special mention — — 291 8,827 20,089 26,344 — — 55,551 (9) Substandard - accruing 17,850 — — 40,900 37,393 38,188 — 2,308 136,639 (9+) Non-accrual — — — — — 198 — — 198 RBF (1-7) Pass 155,595 44,362 9,693 8,565 — 12,732 460,888 — 691,835 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 166,202 148,811 119,017 106,343 61,723 139,723 47,653 29,595 819,067 (8) Special mention — 7,365 — — 845 4,982 — — 13,192 (9) Substandard - accruing — 6,424 — — 16,922 20,184 — — 43,530 (9+) Non-accrual — — — — 2,641 1,450 — 13,741 17,832 Secured by 1-4 family (1-7) Pass 96,899 60,659 40,586 22,976 31,826 65,910 4,535 — 323,391 (8) Special mention — 553 — — — 291 — — 844 (9) Substandard - accruing — — — — — 1,203 — — 1,203 (9+) Non-accrual — — — — — 180 — — 180 Total real estate $ 934,008 $ 844,518 $ 769,592 $ 481,616 $ 326,691 $ 762,427 $ 587,064 $ 71,614 $ 4,777,530 Total $ 2,431,199 $ 4,606,457 $ 2,098,354 $ 1,602,034 $ 866,577 $ 5,939,419 $ 5,205,040 $ 122,881 $ 22,871,961
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 Nine months ended September 30, 2022 Beginning balance $ 102,202 $ 52,568 $ 6,083 $ 51,013 $ 211,866 Provision for credit losses on loans 31,257 (18,636) 4,073 10,923 27,617 Charge-offs 3,210 2,903 — 350 6,463 Recoveries 549 1,044 — — 1,593 Net charge-offs (recoveries) 2,661 1,859 — 350 4,870 Ending balance $ 130,798 $ 32,073 $ 10,156 $ 61,586 $ 234,613 Nine months ended September 30, 2021 Beginning balance $ 73,061 $ 84,064 $ 4,699 $ 92,791 $ 254,615 Provision for credit losses on loans 26,549 (24,730) 1,729 (24,325) (20,777) Charge-offs 8,211 6,418 — 1,192 15,821 Recoveries 2,462 1,366 — 112 3,940 Net charge-offs (recoveries) 5,749 5,052 — 1,080 11,881 Ending balance $ 93,861 $ 54,282 $ 6,428 $ 67,386 $ 221,957
Schedule of impaired loans, by portfolio class	The table below provides an age analysis of our gross loans held for investment: (in thousands) 30-59 Days 60-89 Days 90 Days or More Past Due Total Past Non-Accrual Loans(1) Current Total Non-Accrual With No Allowance September 30, 2022 Commercial $ 10,405 $ 151 $ 30,602 $ 41,158 $ 27,968 $ 8,744,488 $ 8,813,614 $ 3,637 Energy — — — — 6,500 1,099,597 1,106,097 — Mortgage finance — — — — — 4,908,822 4,908,822 — Real estate: CRE 52 — — 52 187 3,310,033 3,310,272 — RBF — — — — — 600,567 600,567 — Other 700 2,453 — 3,153 1,081 786,033 790,267 — Secured by 1-4 family — — 62 62 128 314,408 314,598 — Total $ 11,157 $ 2,604 $ 30,664 $ 44,425 $ 35,864 $ 19,763,948 $ 19,844,237 $ 3,637 (3) As of September 30, 2022 and December 31, 2021, $1.8 million of our non-accrual loans were earning interest income on a cash basis. Additionally, $801,000 in interest income was recognized on non-accrual loans for the nine months ended September 30, 2022. Accrued interest of $100,000 was reversed during the nine months ended September 30, 2022.
Schedule of recorded investment of loans restructured	The following table details the recorded investment of loans restructured during the nine months ended September 30, 2022: Extended Maturity Adjusted Payment Schedule Total (in thousands, except number of contracts) Number of Contracts Balance at Period End Number of Contracts Balance at Period End Number of Contracts Balance at Period End Nine months ended September 30, 2022 Commercial loans — $ — 1 $ 604 1 $ 604 Total — $ — 1 $ 604 1 $ 604

Short-term Borrowings and Lon_2

Short-term Borrowings and Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Summary of borrowings	The table below presents a summary of short-term borrowings: (in thousands) September 30, 2022 December 31, 2021 Customer repurchase agreements $ 1,480 $ 2,832 Federal Home Loan Bank borrowings 1,700,000 2,200,000 Total short-term borrowings $ 1,701,480 $ 2,202,832 The table below presents a summary of long-term debt: (in thousands) September 30, 2022 December 31, 2021 Bank-issued floating rate senior unsecured credit-linked notes due 2024 $ 271,991 $ 270,487 Bank-issued 5.25% fixed rate subordinated notes due 2026 174,131 173,935 Company-issued 4.00% fixed rate subordinated notes due 2031 371,238 370,910 Trust preferred floating rate subordinated debentures due 2032 to 2036 113,406 113,406 Total long-term debt $ 930,766 $ 928,738

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Tables)	9 Months Ended
	Sep. 30, 2022
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 September 30, Nine months ended September 30, (in thousands) 2022 2021 2022 2021 Beginning balance of allowance for off-balance sheet credit losses $ 17,981 $ 16,747 $ 17,265 $ 17,434 Provision for off-balance sheet credit losses 3,667 1,464 4,383 777 Ending balance of allowance for off-balance sheet credit losses $ 21,648 $ 18,211 $ 21,648 $ 18,211 (in thousands) September 30, 2022 December 31, 2021 Commitments to extend credit - period end balance $ 9,182,739 $ 9,445,763 Standby letters of credit - period end balance 419,828 357,672

Regulatory Restrictions (Tables

Regulatory Restrictions (Tables)	9 Months Ended
	Sep. 30, 2022
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(2) Capital Required to be Well Capitalized (dollars in thousands) Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio September 30, 2022 CET1 Company $ 3,011,505 11.08 % $ 1,902,047 7.00 % N/A N/A Bank 3,175,750 11.70 % 1,899,579 7.00 % 1,763,895 6.50 % Total capital (to risk-weighted assets) Company 4,143,219 15.25 % 2,853,071 10.50 % 2,717,210 10.00 % Bank 3,736,226 13.77 % 2,849,369 10.50 % 2,713,685 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,421,505 12.59 % 2,309,629 8.50 % 1,630,326 6.00 % Bank 3,335,750 12.29 % 2,306,632 8.50 % 2,170,948 8.00 % Tier 1 capital (to average assets)(1) Company 3,421,505 10.67 % 1,282,691 4.00 % N/A N/A Bank 3,335,750 10.41 % 1,281,909 4.00 % 1,602,386 5.00 % December 31, 2021 CET1 Company $ 2,949,785 11.06 % $ 1,866,444 7.00 % N/A N/A Bank 3,013,170 11.30 % 1,866,303 7.00 % 1,732,996 6.50 % Total capital (to risk-weighted assets) Company 4,085,540 15.32 % 2,799,666 10.50 % 2,666,348 10.00 % Bank 3,578,014 13.42 % 2,799,455 10.50 % 2,666,148 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,359,785 12.60 % 2,266,396 8.50 % 1,599,809 6.00 % Bank 3,173,170 11.90 % 2,266,225 8.50 % 2,132,918 8.00 % Tier 1 capital (to average assets)(1) Company 3,359,785 9.01 % 1,490,902 4.00 % N/A N/A Bank 3,173,170 8.51 % 1,490,677 4.00 % 1,863,346 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. (2) Percentages represent the minimum capital ratios plus the fully phased-in 2.5% CET1 capital buffer under the Basel III Capital Rules.

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2022
Compensation Related Costs [Abstract]
Schedule of stock-based compensation costs	The table below summarizes our stock-based compensation expense: Three months ended September 30, Nine months ended September 30, (in thousands) 2022 2021 2022 2021 Stock-settled awards: RSUs $ 5,376 $ 8,324 $ 15,805 $ 22,099 Restricted stock — — — 1 Cash-settled units 3 64 186 1,092 Total $ 5,379 $ 8,388 $ 15,991 $ 23,192
Schedule of unrecognized compensation costs	(in thousands except period data) September 30, 2022 Unrecognized compensation expense related to unvested stock-settled awards $ 37,492 Weighted average period over which expense is expected to be recognized, in years 2.4

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	9 Months Ended
	Sep. 30, 2022
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 September 30, 2022 Available-for-sale debt securities:(1) U.S. Treasury securities $ 637,281 $ — $ — U.S. government agency securities — 101,690 — Residential mortgage-backed securities — 1,630,101 — CRT securities — — 11,702 Equity securities(1)(2) 21,932 11,041 — Mortgage loans held for sale(3) — — 4,387 Derivative assets(4) — 24,093 — Derivative liabilities(4) — 108,608 — Non-qualified deferred compensation plan liabilities(5) 20,028 — — December 31, 2021 Available-for-sale debt securities:(1) U.S. government agency securities $ — $ 120,944 $ — Residential mortgage-backed securities — 3,225,378 — Tax-exempt asset-backed securities — — 180,033 CRT securities — — 11,846 Equity securities(1)(2) 33,589 12,018 — Mortgage loans held for sale(3) — 465 7,658 Derivative assets(4) — 37,788 — Derivative liabilities(4) — 37,788 — Non-qualified deferred compensation plan liabilities(5) 29,695 — — (1) Investment 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 investments that qualify for consideration under the regulations implementing the Community Reinvestment Act and investments related to our non-qualified deferred compensation plan. (3) Mortgage loans held for sale are measured at fair value on a recurring basis, generally monthly. (4) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly. (5) 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 summarizes the changes in Level 3 assets measured at fair value on a recurring basis: Net Gains (Losses) (in thousands) Balance at Beginning of Period Purchases / Additions Sales / Reductions Realized Unrealized Balance at End of Period Three months ended September 30, 2022 Available-for-sale debt securities:(1) CRT securities $ 11,670 $ — $ — $ — $ 32 $ 11,702 Loans held for sale(2) 4,266 571 (450) — — 4,387 Three months ended September 30, 2021 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 185,954 $ — $ (2,270) $ — $ 1,136 $ 184,820 CRT securities 11,713 — — — 91 11,804 Loans held for sale(2) 8,227 440 (870) — (96) 7,701 Nine months ended September 30, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 180,033 $ — $ (170,626) $ — $ (9,407) $ — CRT securities 11,846 — — — (144) 11,702 Loans held for sale(2) 7,658 1,898 (5,050) — (119) 4,387 Nine months ended September 30, 2021 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 199,176 $ — $ (13,783) $ — $ (573) $ 184,820 CRT securities 11,417 — — — 387 11,804 Loans held for sale(2) 6,933 2,125 (1,395) 5 33 7,701 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI. Realized gains/(losses) are recorded in other non-interest income on the consolidated statements of income and other comprehensive income/(loss). (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in net gain/(loss) on sale of loans held for sale on the consolidated statements of income and other comprehensive income/(loss).
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: Estimated Fair Value (in thousands) Carrying Total Level 1 Level 2 Level 3 September 30, 2022 Financial assets: Cash and cash equivalents $ 3,640,247 $ 3,640,247 $ 3,640,247 $ — $ — Available-for-sale debt securities 2,380,774 2,380,774 637,281 1,731,791 11,702 Held-to-maturity debt securities 955,875 819,701 — 819,701 — Equity securities 32,973 32,973 21,932 11,041 — Loans held for sale 3,142,178 3,113,806 — — 3,113,806 Loans held for investment, net 19,553,168 19,472,586 — — 19,472,586 Derivative assets 24,093 24,093 — 24,093 — Financial liabilities: Total deposits 24,498,563 24,502,640 — — 24,502,640 Short-term borrowings 1,701,480 1,701,480 — 1,701,480 — Long-term debt 930,766 873,342 — 873,342 — Derivative liabilities 108,608 108,608 — 108,608 — December 31, 2021 Financial assets: Cash and cash equivalents $ 7,946,659 $ 7,946,659 $ 7,946,659 $ — $ — Available-for-sale debt securities 3,538,201 3,538,201 — 3,346,322 191,879 Equity securities 45,607 45,607 33,589 12,018 — Loans held for sale 8,123 8,123 — 465 7,658 Loans held for investment, net 22,595,088 22,631,252 — — 22,631,252 Derivative assets 37,788 37,788 — 37,788 — Financial liabilities: Total deposits 28,109,365 28,109,762 — — 28,109,762 Short-term borrowings 2,202,832 2,202,832 — 2,202,832 — Long-term debt 928,738 952,404 — 952,404 — Derivative liabilities 37,788 37,788 — 37,788 —

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2022
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. September 30, 2022 December 31, 2021 Estimated Fair Value Estimated Fair Value (in thousands) Notional Asset Derivative Liability Derivative Notional Asset Derivative Liability Derivative Derivatives designated as hedges Cash flow hedges: Interest rate contracts: Swaps hedging loans $ 3,000,000 $ 357 $ 80,135 $ — $ — $ — Non-hedging derivatives Customer-initiated and other derivatives: Interest rate contracts: Swaps 3,989,586 86,138 86,138 3,536,090 40,922 40,922 Caps and floors written 130,415 — 1,489 191,291 94 — Caps and floors purchased 130,415 1,489 — 191,291 — 94 Forward contracts 1,025,581 12,536 12,429 — — — Gross derivatives 100,520 180,191 41,016 41,016 Netting adjustment - offsetting derivative assets/liabilities (2,476) (2,476) (3,228) (3,228) Netting adjustment - cash collateral received/posted (73,951) (69,107) — — Net derivatives included on the consolidated balance sheets $ 24,093 $ 108,608 $ 37,788 $ 37,788

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2022
Accumulated Other Comprehensive Income [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table provides the change in AOCI by component: (in thousands) Cash Flow Hedges Available-for-Sale Securities Held-to-Maturity Securities Total Three months ended September 30, 2022 Beginning balance $ (316) $ (220,090) $ (51,802) $ (272,208) Change in unrealized gain/(loss) (78,177) (129,027) — (207,204) Amounts reclassified into net income (1,760) — 2,369 609 Total other comprehensive income/(loss) (79,937) (129,027) 2,369 (206,595) Income tax expense/(benefit) (16,786) (27,095) 497 (43,384) Total other comprehensive income/(loss), net of tax (63,151) (101,932) 1,872 (163,211) Ending balance $ (63,467) $ (322,022) $ (49,930) $ (435,419) Three months ended September 30, 2021 Beginning balance $ — $ (26,389) $ — $ (26,389) Change in unrealized gain/(loss) — (18,131) — (18,131) Amounts reclassified into net income — — — — Total other comprehensive income/(loss) — (18,131) — (18,131) Income tax expense/(benefit) — (3,808) — (3,808) Total other comprehensive income/(loss), net of tax — (14,323) — (14,323) Ending balance $ — $ (40,712) $ — $ (40,712) Nine months ended September 30, 2022 Beginning balance $ — $ (47,715) $ — $ (47,715) Change in unrealized gain/(loss) (77,873) (347,223) (69,165) (494,261) Amounts reclassified into net income (2,464) — 5,962 3,498 Total other comprehensive income/(loss) (80,337) (347,223) (63,203) (490,763) Income tax expense/(benefit) (16,870) (72,916) (13,273) (103,059) Total other comprehensive income/(loss), net of tax (63,467) (274,307) (49,930) (387,704) Ending balance $ (63,467) $ (322,022) $ (49,930) $ (435,419) Nine months ended September 30, 2021 Beginning balance $ — $ 15,774 $ — $ 15,774 Change in unrealized gain/(loss) — (71,501) — (71,501) Amounts reclassified into net income — — — — Total other comprehensive income/(loss) — (71,501) — (71,501) Income tax expense/(benefit) — (15,015) — (15,015) Total other comprehensive income/(loss), net of tax — (56,486) — (56,486) Ending balance $ — $ (40,712) $ — $ (40,712)

Operations and Summary of Sig_3

Operations and Summary of Significant Accounting Policies - Additional Information (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - BDCF - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, including discontinued operation, financing receivable, excluding accrued interest	$ 3,100		$ 3,100
Disposal group, including discontinued operation, consideration	$ 3,400		$ 3,400
Disposal group, including discontinued operation, asset premium percentage	8.50%		8.50%
Disposal group pre-tax net income	$ 11.9	$ 17.4	$ 49.5	$ 48.7

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 41,418	$ 43,390	$ 115,227	$ 188,809
Preferred stock dividends	4,313	4,312	12,938	14,408
Net income available to common stockholders	$ 37,105	$ 39,078	$ 102,289	$ 174,401
Denominator:
Denominator for basic earnings per common share—weighted average common shares	49,891,727	50,600,732	50,506,364	50,568,439
Effect of dilutive outstanding stock-settled awards	526,157	538,823	584,151	555,836
Denominator for dilutive earnings per common share—weighted average diluted common shares	50,417,884	51,139,555	51,090,515	51,124,275
Basic earnings per common share	$ 0.74	$ 0.77	$ 2.03	$ 3.45
Diluted earnings per common share	$ 0.74	$ 0.76	$ 2	$ 3.41
Anti-dilutive outstanding stock-settled awards	174,706	208,813	315,499	104,174

Investment Securities - Summary

Investment Securities - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale debt securities:
Total	$ 2,788,396	$ 3,598,600
Gross Unrealized Gains	7	9,563
Gross Unrealized Losses	(407,629)	(69,962)
Estimated Fair Value	2,380,774	3,538,201
Held-to-maturity debt securities:
Amortized Cost(1)	955,875	0
Gross Unrealized Gains	0
Gross Unrealized Losses	136,174
Estimated Fair Value	819,701
Equity securities	32,973	45,607
Total investment securities	3,369,622	3,583,808
Interest receivable	71,800	50,900
Available-for-Sale
Available-for-sale debt securities:
Total	2,788,396
Estimated Fair Value	2,380,774
Held-to-maturity debt securities:
Interest receivable	4,200	6,600
Held-to-Maturity
Held-to-maturity debt securities:
Estimated Fair Value	819,701
Interest receivable	1,500
U.S. Treasury securities
Available-for-sale debt securities:
Total	668,093
Gross Unrealized Gains	0
Gross Unrealized Losses	(30,812)
Estimated Fair Value	637,281
U.S. government agency securities
Available-for-sale debt securities:
Total	125,000	125,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(23,310)	(4,056)
Estimated Fair Value	101,690	120,944
Residential mortgage-backed securities
Available-for-sale debt securities:
Total	1,980,590	3,288,261
Gross Unrealized Gains	7	156
Gross Unrealized Losses	(350,496)	(63,039)
Estimated Fair Value	1,630,101	3,225,378
Held-to-maturity debt securities:
Amortized Cost(1)	955,875
Gross Unrealized Gains	0
Gross Unrealized Losses	136,174
Estimated Fair Value	819,701
Tax-exempt asset-backed securities
Available-for-sale debt securities:
Total		170,626
Gross Unrealized Gains		9,407
Gross Unrealized Losses		0
Estimated Fair Value		180,033
Credit risk transfer (“CRT”) securities
Available-for-sale debt securities:
Total	14,713	14,713
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,011)	(2,867)
Estimated Fair Value	$ 11,702	$ 11,846

Investment Securities - Additio

Investment Securities - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt securities, held-to-maturity, discount | $	$ 69.2
Debt securities, available-for-sale, number of unrealized loss positions	98
Held-to-Maturity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Available-for-sale debt securities transferred to held-to-maturity at fair value | $	$ 1,000
U.S. Treasury securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt securities, available-for-sale, number of unrealized loss positions	12
U.S. government agency securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt securities, available-for-sale, number of unrealized loss positions	5
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt securities, available-for-sale, number of unrealized loss positions	79
Credit risk transfer (“CRT”) securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt securities, available-for-sale, number of unrealized loss positions	2
Customer repurchase agreements
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits | $	$ 18.6	$ 22
Deposits
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits | $	$ 1.4	$ 2

Investment Securities - Debt Se

Investment Securities - Debt Securities Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Total	$ 2,788,396	$ 3,598,600
Fair Value
Available-for-sale debt securities	2,380,774	$ 3,538,201
Fair Value
Total	819,701
Available-for-Sale
Amortized Cost
Due within one year	41
Due after one year through five years	668,093
Due after five years through ten years	156,587
Due after ten years	1,963,675
Total	2,788,396
Fair Value
Due within one year	41
Due after one year through five years	637,281
Due after five years through ten years	127,368
Due after ten years	1,616,084
Available-for-sale debt securities	2,380,774
Held-to-Maturity
Amortized Cost
Due within one year	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	955,875
Total	955,875
Fair Value
Due within one year	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	819,701
Total	$ 819,701

Investment Securities - Debt _2

Investment Securities - Debt Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	$ 948,119	$ 2,895,137
Less Than 12 Months, Unrealized Loss	(97,979)	(51,636)
12 Months or Longer, Fair Value	1,432,046	412,196
12 Months or Longer, Unrealized Loss	(309,650)	(18,326)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,380,165	3,307,333
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(407,629)	(69,962)
U.S. Treasury securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	637,281
Less Than 12 Months, Unrealized Loss	(30,812)
12 Months or Longer, Fair Value	0
12 Months or Longer, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	637,281
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(30,812)
U.S. government agency securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	0	24,085
Less Than 12 Months, Unrealized Loss	0	(915)
12 Months or Longer, Fair Value	101,690	96,859
12 Months or Longer, Unrealized Loss	(23,310)	(3,141)
Debt Securities, Available-for-sale, Unrealized Loss Position	101,690	120,944
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(23,310)	(4,056)
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	310,838	2,871,052
Less Than 12 Months, Unrealized Loss	(67,167)	(50,721)
12 Months or Longer, Fair Value	1,318,654	303,491
12 Months or Longer, Unrealized Loss	(283,329)	(12,318)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,629,492	3,174,543
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(350,496)	(63,039)
Credit risk transfer (“CRT”) securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Unrealized Loss	0	0
12 Months or Longer, Fair Value	11,702	11,846
12 Months or Longer, Unrealized Loss	(3,011)	(2,867)
Debt Securities, Available-for-sale, Unrealized Loss Position	11,702	11,846
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (3,011)	$ (2,867)

Investment Securities - Equity

Investment Securities - Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Net gains/(losses) recognized during the period	$ (1,165)	$ 850	$ (9,801)	$ 4,496
Less: Realized net gains/(losses) recognized on securities sold	587	(347)	589	(1,096)
Unrealized net gains/(losses) recognized on securities held	$ (578)	$ 503	$ (9,212)	$ 3,400

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Loans By Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	$ 19,844,237	$ 22,871,961
Unearned income (net of direct origination costs)	(56,456)	(65,007)
Total loans held for investment	19,787,781	22,806,954
Allowance for credit losses on loans	(234,613)	(211,866)	$ (221,957)	$ (254,615)
Total loans held for investment, net	19,553,168	22,595,088
Loans held for sale	3,142,178	8,123
Interest receivable	71,800	50,900
Non-accrual	35,864
Insurance premium finance loans, at lower of cost or fair value
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for sale	3,137,791	0
Non-accrual	1,300
Past due 90 days and still accruing	3,100
Mortgage loans, at fair value
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for sale	4,387	8,123
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	8,813,614	9,897,561
Allowance for credit losses on loans	(130,798)	(102,202)	(93,861)	(73,061)
Non-accrual	27,968
Energy
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	1,106,097	721,373
Allowance for credit losses on loans	(32,073)	(52,568)	(54,282)	(84,064)
Non-accrual	6,500
Mortgage finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	4,908,822	7,475,497
Allowance for credit losses on loans	(10,156)	(6,083)	(6,428)	(4,699)
Non-accrual	0
Real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans held for investment	5,015,704	4,777,530
Allowance for credit losses on loans	$ (61,586)	$ (51,013)	$ (67,386)	$ (92,791)

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Loans by Credit Quality Grade (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 2,764,912	$ 2,431,199
2021	2,288,994	4,606,457
2020	1,311,931	2,098,354
2019	1,441,483	1,602,034
2018	1,169,943	866,577
2017 and prior	4,299,871	5,939,419
Revolving lines of credit	6,492,654	5,205,040
Revolving lines of credit converted to term loans	74,449	122,881
Total	19,844,237	22,871,961
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,566,512	1,136,399
2021	857,941	3,171,323
2020	259,034	672,317
2019	434,737	365,908
2018	257,913	207,885
2017 and prior	335,010	308,275
Revolving lines of credit	5,071,303	3,984,187
Revolving lines of credit converted to term loans	31,164	51,267
Total	8,813,614	9,897,561
Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,530,588	1,133,013
2021	776,714	3,157,150
2020	252,321	546,520
2019	366,245	319,246
2018	225,307	200,478
2017 and prior	316,001	289,795
Revolving lines of credit	5,004,072	3,960,706
Revolving lines of credit converted to term loans	27,344	41,377
Total	8,498,592	9,648,285
Commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	28,302	2,650
2021	38,477	5,277
2020	6,398	23,129
2019	37,809	8,697
2018	7,526	39
2017 and prior	5,769	5,322
Revolving lines of credit	35,967	5,120
Revolving lines of credit converted to term loans	3,820	7,883
Total	164,068	58,117
Commercial | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	42,148	7,705
2020	315	102,619
2019	30,647	25,010
2018	15,133	6,202
2017 and prior	6,365	6,962
Revolving lines of credit	28,378	14,742
Revolving lines of credit converted to term loans	0	2,007
Total	122,986	165,247
Commercial | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022	7,622	736
2021	602	1,191
2020	0	49
2019	36	12,955
2018	9,947	1,166
2017 and prior	6,875	6,196
Revolving lines of credit	2,886	3,619
Revolving lines of credit converted to term loans	0	0
Total	27,968	25,912
Energy
Financing Receivable, Credit Quality Indicator [Line Items]
2022	129,764	71,750
2021	23,517	0
2020	0	0
2019	0	3
2018	20,000	0
2017 and prior	5,743	15,831
Revolving lines of credit	927,073	633,789
Revolving lines of credit converted to term loans	0	0
Total	1,106,097	721,373
Energy | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	129,764	71,750
2021	23,517	0
2020	0	0
2019	0	3
2018	20,000	0
2017 and prior	5,743	7,188
Revolving lines of credit	912,936	577,988
Revolving lines of credit converted to term loans	0	0
Total	1,091,960	656,929
Energy | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	0
Revolving lines of credit	0	27,421
Revolving lines of credit converted to term loans	0	0
Total	0	27,421
Energy | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	8,643
Revolving lines of credit	7,637	0
Revolving lines of credit converted to term loans	0	0
Total	7,637	8,643
Energy | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	0
Revolving lines of credit	6,500	28,380
Revolving lines of credit converted to term loans	0	0
Total	6,500	28,380
Mortgage finance
Financing Receivable, Credit Quality Indicator [Line Items]
2022	7,913	289,042
2021	457,792	590,616
2020	196,598	656,445
2019	393,675	754,507
2018	556,944	332,001
2017 and prior	3,295,900	4,852,886
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	4,908,822	7,475,497
Mortgage finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	7,913	289,042
2021	457,792	590,616
2020	196,598	656,445
2019	393,675	754,507
2018	555,480	332,001
2017 and prior	3,292,412	4,852,886
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	4,903,870	7,475,497
Mortgage finance | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	0
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	0	0
Mortgage finance | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	1,464	0
2017 and prior	3,488	0
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	4,952	0
Mortgage finance | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	0
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	0	0
Real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,060,723	934,008
2021	949,744	844,518
2020	856,299	769,592
2019	613,071	481,616
2018	335,086	326,691
2017 and prior	663,218	762,427
Revolving lines of credit	494,278	587,064
Revolving lines of credit converted to term loans	43,285	71,614
Total	5,015,704	4,777,530
Real estate | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,310,272
Real estate | Commercial Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	800,519	497,462
2021	611,459	576,344
2020	657,829	600,005
2019	487,368	294,005
2018	183,225	155,252
2017 and prior	366,644	451,042
Revolving lines of credit	60,672	73,988
Revolving lines of credit converted to term loans	15,969	25,970
Total	3,183,685	2,674,068
Real estate | Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	2,396	0
2021	7,249	0
2020	7,940	291
2019	5,297	8,827
2018	33,454	20,089
2017 and prior	22,063	26,344
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	78,399	55,551
Real estate | Commercial Real Estate | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	17,850
2021	17,850	0
2020	0	0
2019	0	40,900
2018	11,522	37,393
2017 and prior	18,629	38,188
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	2,308
Total	48,001	136,639
Real estate | Commercial Real Estate | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	187	198
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	187	198
Real estate | Residential Homebuilder Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Total	600,567
Real estate | Residential Homebuilder Finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	82,515	155,595
2021	85,477	44,362
2020	19,560	9,693
2019	13,915	8,565
2018	7,462	0
2017 and prior	1,162	12,732
Revolving lines of credit	390,476	460,888
Revolving lines of credit converted to term loans	0	0
Total	600,567	691,835
Real estate | Residential Homebuilder Finance | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	0
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	0	0
Real estate | Residential Homebuilder Finance | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	0
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	0	0
Real estate | Residential Homebuilder Finance | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	0	0
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	0	0
Real estate | Other Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Total	790,267
Real estate | Other Financing Receivable | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	129,406	166,202
2021	137,275	148,811
2020	103,917	119,017
2019	79,637	106,343
2018	79,984	61,723
2017 and prior	170,709	139,723
Revolving lines of credit	39,074	47,653
Revolving lines of credit converted to term loans	27,316	29,595
Total	767,318	819,067
Real estate | Other Financing Receivable | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	7,365
2020	10,711	0
2019	0	0
2018	0	845
2017 and prior	10,099	4,982
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	20,810	13,192
Real estate | Other Financing Receivable | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	6,424
2020	0	0
2019	0	0
2018	0	16,922
2017 and prior	1,058	20,184
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	1,058	43,530
Real estate | Other Financing Receivable | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	1,081	0
2019	0	0
2018	0	2,641
2017 and prior	0	1,450
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	13,741
Total	1,081	17,832
Real estate | Secured by 1-4 family
Financing Receivable, Credit Quality Indicator [Line Items]
Total	314,598
Real estate | Secured by 1-4 family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	45,887	96,899
2021	90,434	60,659
2020	55,261	40,586
2019	26,854	22,976
2018	19,439	31,826
2017 and prior	72,329	65,910
Revolving lines of credit	4,056	4,535
Revolving lines of credit converted to term loans	0	0
Total	314,260	323,391
Real estate | Secured by 1-4 family | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	553
2020	0	0
2019	0	0
2018	0	0
2017 and prior	44	291
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	44	844
Real estate | Secured by 1-4 family | Substandard-accruing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	166	1,203
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	166	1,203
Real estate | Secured by 1-4 family | Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 and prior	128	180
Revolving lines of credit	0	0
Revolving lines of credit converted to term loans	0	0
Total	$ 128	$ 180

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 211,866	$ 254,615
Provision for credit losses on loans	27,617	(20,777)
Charge-offs	6,463	15,821
Recoveries	1,593	3,940
Net charge-offs (recoveries)	4,870	11,881
Ending balance	234,613	221,957
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	102,202	73,061
Provision for credit losses on loans	31,257	26,549
Charge-offs	3,210	8,211
Recoveries	549	2,462
Net charge-offs (recoveries)	2,661	5,749
Ending balance	130,798	93,861
Energy
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	52,568	84,064
Provision for credit losses on loans	(18,636)	(24,730)
Charge-offs	2,903	6,418
Recoveries	1,044	1,366
Net charge-offs (recoveries)	1,859	5,052
Ending balance	32,073	54,282
Mortgage finance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,083	4,699
Provision for credit losses on loans	4,073	1,729
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	10,156	6,428
Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	51,013	92,791
Provision for credit losses on loans	10,923	(24,325)
Charge-offs	350	1,192
Recoveries	0	112
Net charge-offs (recoveries)	350	1,080
Ending balance	$ 61,586	$ 67,386

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Impact of Adoption Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for credit losses	$ 12,000	$ 5,000	$ 32,000	$ (20,000)
Net charge-offs (recoveries)			4,870	11,881
Financing receivable, excluding accrued interest, before allowance for credit loss	19,844,237		19,844,237		$ 22,871,961
Criticized
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	$ 484,000	$ 728,900	484,000	728,900	$ 582,900
Leveraged Lending
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net charge-offs (recoveries)				11,900
Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for credit losses			$ (32,000)	$ 20,000

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses on Loans - Collateral Dependent (Details) $ in Millions	Sep. 30, 2022 USD ($)
Real estate | Real Property | Asset Pledged as Collateral
Financing Receivable, Past Due [Line Items]
Collateral-dependent real estate loans	$ 0

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses on Loans - Age Analysis (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	$ 19,844,237,000		$ 22,871,961,000
Non-accrual	35,864,000
Non-Accrual With No Allowance	3,637,000
Nonaccrual, interest income	801,000	$ 1,800,000
Interest income reversed	100,000
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	11,157,000
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	2,604,000
Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	30,664,000
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	44,425,000
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	19,763,948,000
Commercial
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	8,813,614,000		9,897,561,000
Non-accrual	27,968,000
Non-Accrual With No Allowance	3,637,000
Commercial | 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	10,405,000
Commercial | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	151,000
Commercial | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	30,602,000
Commercial | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	41,158,000
Commercial | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	8,744,488,000
Energy
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	1,106,097,000		721,373,000
Non-accrual	6,500,000
Non-Accrual With No Allowance	0
Energy | 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Energy | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Energy | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Energy | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Energy | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	1,099,597,000
Mortgage finance
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	4,908,822,000		7,475,497,000
Non-accrual	0
Non-Accrual With No Allowance	0
Mortgage finance | 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Mortgage finance | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Mortgage finance | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Mortgage finance | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Mortgage finance | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	4,908,822,000
Real estate
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	5,015,704,000		$ 4,777,530,000
Real estate | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	3,310,272,000
Non-accrual	187,000
Non-Accrual With No Allowance	0
Real estate | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	600,567,000
Non-accrual	0
Non-Accrual With No Allowance	0
Real estate | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	790,267,000
Non-accrual	1,081,000
Non-Accrual With No Allowance	0
Real estate | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	314,598,000
Non-accrual	128,000
Non-Accrual With No Allowance	0
Real estate | 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	52,000
Real estate | 30 to 59 Days Past Due | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | 30 to 59 Days Past Due | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	700,000
Real estate | 30 to 59 Days Past Due | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | 60 to 89 Days Past Due | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | 60 to 89 Days Past Due | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	2,453,000
Real estate | 60 to 89 Days Past Due | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | Greater Than 90 Days | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | Greater Than 90 Days | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | Greater Than 90 Days | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | Greater Than 90 Days | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	62,000
Real estate | Financial Asset, Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	52,000
Real estate | Financial Asset, Past Due | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	0
Real estate | Financial Asset, Past Due | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	3,153,000
Real estate | Financial Asset, Past Due | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	62,000
Real estate | Financial Asset, Not Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	3,310,033,000
Real estate | Financial Asset, Not Past Due | Residential Homebuilder Finance
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	600,567,000
Real estate | Financial Asset, Not Past Due | Other Financing Receivable
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	786,033,000
Real estate | Financial Asset, Not Past Due | Secured by 1-4 family
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	$ 314,408,000

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses on Loans - Restructured Loans (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($)
Receivables [Abstract]
Nonaccrual loans that met the criteria for restructured	$ 2,200	$ 19,400
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1
Balance at Period End	$ 604
Extended Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0
Balance at Period End	$ 0
Adjusted Payment Schedule
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1
Balance at Period End	$ 604
Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1
Balance at Period End	$ 604
Commercial loans | Extended Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0
Balance at Period End	$ 0
Commercial loans | Adjusted Payment Schedule
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1
Balance at Period End	$ 604

Short-term Borrowings and Lon_3

Short-term Borrowings and Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	May 06, 2021	Jan. 31, 2014
Debt Instrument [Line Items]
Amount outstanding at year-end	$ 1,701,480	$ 2,202,832
Long-term debt	930,766	928,738
Customer repurchase agreements
Debt Instrument [Line Items]
Amount outstanding at year-end	1,480
Federal Home Loan Bank borrowings
Debt Instrument [Line Items]
Amount outstanding at year-end	1,700,000
Senior Unsecured Credit-Linked Notes, Due 2024
Debt Instrument [Line Items]
Face amount	271,991	270,487
5.75% Subordinated Notes, Due 2026
Debt Instrument [Line Items]
Subordinated debt	174,131	173,935
Stated interest rate				5.25%
4.00% Subordinated Notes, Due 2031
Debt Instrument [Line Items]
Subordinated debt	371,238	370,910
Stated interest rate			4%
Floating Rate Subordinated Debentures, Due 2032 to 2036
Debt Instrument [Line Items]
Subordinated debt	$ 113,406	113,406
Customer repurchase agreements
Debt Instrument [Line Items]
Amount outstanding at year-end		2,832
Federal Home Loan Bank borrowings
Debt Instrument [Line Items]
Amount outstanding at year-end		$ 2,200,000

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Beginning balance of allowance for off-balance sheet credit losses	$ 17,981	$ 16,747	$ 17,265	$ 17,434
Provision for off-balance sheet credit losses	3,667	1,464	4,383	777
Ending balance of allowance for off-balance sheet credit losses	21,648	$ 18,211	21,648	$ 18,211
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	9,182,739		9,182,739		$ 9,445,763
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	$ 419,828		$ 419,828		$ 357,672

Regulatory Restrictions - Addit

Regulatory Restrictions - Additional Information (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Apr. 19, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2019	Dec. 31, 2009 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Assets	$ 30,408,513		$ 34,731,738		$ 15,000,000
Share repurchase program, authorized amount		$ 150,000
Stock Repurchased During Period, Shares | shares	941,879
Stock Repurchased During Period, Value	$ 50,023
Repurchase Of Common Stock Price Per Share | $ / shares	$ 53.11
Basel III, Phased-In
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1, Tier 1, and total capital to risk-weighted assets capital conservation buffer				0.025

Regulatory Restrictions - Sched

Regulatory Restrictions - Schedule of Compliance With Regulatory Capital Requirements (Details) $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2019
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 3,011,505	$ 2,949,785
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	4,143,219	4,085,540
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,717,210	2,666,348
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	3,421,505	3,359,785
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	1,630,326	1,599,809
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	$ 3,421,505	$ 3,359,785
Banking Regulation, Risk-Based Information [Abstract]
CET1, actual ratio	11.08%	11.06%
Total capital (to risk weighted assets), actual ratio	0.1525	0.1532
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	0.1259	0.1260
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio	0.0600	0.0600
Tier 1 capital (to average assets), actual ratio	0.1067	0.0901
Bank
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 3,175,750	$ 3,013,170
CET1 to be well capitalized under prompt corrective action provisions, amount	1,763,895	1,732,996
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	3,736,226	3,578,014
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,713,685	2,666,148
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	3,335,750	3,173,170
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,170,948	2,132,918
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	3,335,750	3,173,170
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, amount	$ 1,602,386	$ 1,863,346
Banking Regulation, Risk-Based Information [Abstract]
CET1, actual ratio	11.70%	11.30%
CET1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Total capital (to risk weighted assets), actual ratio	0.1377	0.1342
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	0.1229	0.1190
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	0.1041	0.0851
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	$ 1,902,047	$ 1,866,444
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,853,071	2,799,666
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,309,629	2,266,396
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,282,691	$ 1,490,902
Banking Regulation, Risk-Based Information [Abstract]
CET1 for capital adequacy purposes, ratio	7%	7%
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	$ 1,899,579	$ 1,866,303
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,849,369	2,799,455
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,306,632	2,266,225
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,281,909	$ 1,490,677
Banking Regulation, Risk-Based Information [Abstract]
CET1 for capital adequacy purposes, ratio	7%	7%
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 ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Apr. 19, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 5,379	$ 8,388	$ 15,991	$ 23,192
Unrecognized compensation expense related to unvested stock-settled awards	37,492		$ 37,492
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	5,376	8,324	$ 15,805	22,099
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	0	0	0	1
Cash-settled performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 3	$ 64	$ 186	$ 1,092
Long-Term Incentive Plan 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan					1,124,880

Fair Value Disclosures (Details

Fair Value Disclosures (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 2,380,774	$ 3,538,201
Equity securities	32,973	45,607
Derivative assets		37,788
Derivative liabilities		37,788
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	637,281
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	101,690	120,944
Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities		180,033
Credit risk transfer (“CRT”) securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	11,702	11,846
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	24,093
Derivative liabilities	108,608
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	20,028	29,695
Fair value measurements, recurring basis | Level 1 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	637,281
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]
Available-for-sale debt 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]
Available-for-sale debt 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]
Available-for-sale debt securities		0
Fair value measurements, recurring basis | Level 1 | Credit risk transfer (“CRT”) securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt 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]
Equity securities	21,932	33,589
Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0	465
Derivative liabilities		37,788
Non-qualified deferred compensation plan liabilities	0	0
Fair value measurements, recurring basis | Level 2 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	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]
Available-for-sale debt securities	101,690	120,944
Fair value measurements, recurring basis | Level 2 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,630,101	3,225,378
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]
Available-for-sale debt securities		0
Fair value measurements, recurring basis | Level 2 | Credit risk transfer (“CRT”) securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt 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]
Equity securities	11,041	12,018
Fair value measurements, recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	4,387	7,658
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. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	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]
Available-for-sale debt 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]
Available-for-sale debt 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]
Available-for-sale debt securities		180,033
Fair value measurements, recurring basis | Level 3 | Credit risk transfer (“CRT”) securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	11,702	11,846
Fair value measurements, recurring basis | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 0	0
Not Designated as Hedging Instrument | Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		$ 37,788

Fair Value Disclosures (Detai_2

Fair Value Disclosures (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Tax-exempt asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		$ 185,954	$ 180,033	$ 199,176
Purchases / Additions		0	0	0
Sales / Reductions		(2,270)	(170,626)	(13,783)
Realized		0	0	0
Unrealized		1,136	(9,407)	(573)
Balance at End of Period	$ 0	184,820	0	184,820
Credit risk transfer (“CRT”) securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	11,670	11,713	11,846	11,417
Purchases / Additions	0	0	0	0
Sales / Reductions	0	0	0	0
Realized	0	0	0	0
Unrealized	32	91	(144)	387
Balance at End of Period	11,702	11,804	11,702	11,804
Loans Held For Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	4,266	8,227	7,658	6,933
Purchases / Additions	571	440	1,898	2,125
Sales / Reductions	(450)	(870)	(5,050)	(1,395)
Realized	0	0	0	5
Unrealized	0	(96)	(119)	33
Balance at End of Period	$ 4,387	$ 7,701	$ 4,387	$ 7,701

Fair Value Disclosures (Detai_3

Fair Value Disclosures (Details 2)	Sep. 30, 2022	Dec. 31, 2021
Measurement Input, Discount Rate
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Loans Held-for-sale, measurement input	0.904	0.978
Minimum | Credit risk transfer (“CRT”) securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, term	5 years 2 months 23 days
Minimum | Measurement Input, Discount Rate | Credit risk transfer (“CRT”) securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0697
Maximum | Credit risk transfer (“CRT”) securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, term	8 years 11 months 4 days
Maximum | Measurement Input, Discount Rate | Credit risk transfer (“CRT”) securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.1152
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		0.0260
AFS, term		4 years 7 months 9 days
Weighted Average | Measurement Input, Discount Rate | Credit risk transfer (“CRT”) securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
AFS, measurement input	0.0849	0.0497
AFS, term	6 years 5 months 15 days	6 years 4 months 6 days

Fair Value Disclosures (Detai_4

Fair Value Disclosures (Details 3) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	$ 2,380,774	$ 3,538,201
Held-to-maturity debt securities	955,875	0
Equity securities	32,973	45,607
Derivative assets		37,788
Long-term debt	930,766	928,738
Derivative liabilities		37,788
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,640,247	7,946,659
Available-for-sale debt securities	2,380,774	3,538,201
Held-to-maturity debt securities	955,875
Equity securities	32,973	45,607
Loans held for sale	3,142,178	8,123
Loans held for investment, net	19,553,168	22,595,088
Derivative assets	24,093	37,788
Total deposits	24,498,563	28,109,365
Short-term borrowings	1,701,480	2,202,832
Long-term debt	930,766	928,738
Derivative liabilities	108,608	37,788
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,640,247	7,946,659
Available-for-sale debt securities	2,380,774	3,538,201
Held-to-maturity debt securities	819,701
Equity securities	32,973	45,607
Loans held for sale	3,113,806	8,123
Loans held for investment, net	19,472,586	22,631,252
Derivative assets	24,093	37,788
Total deposits	24,502,640	28,109,762
Short-term borrowings	1,701,480	2,202,832
Long-term debt	873,342	952,404
Derivative liabilities	108,608	37,788
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,640,247	7,946,659
Available-for-sale debt securities	637,281
Equity securities	21,932	33,589
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	24,093
Derivative liabilities	108,608
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	1,731,791	3,346,322
Held-to-maturity debt securities	819,701
Equity securities	11,041	12,018
Loans held for sale		465
Derivative assets	24,093	37,788
Short-term borrowings	1,701,480	2,202,832
Long-term debt	873,342	952,404
Derivative liabilities	108,608	37,788
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	11,702	191,879
Loans held for sale	3,113,806	7,658
Loans held for investment, net	19,472,586	22,631,252
Total deposits	$ 24,502,640	$ 28,109,762

Derivative Financial Instrume_3

Derivative Financial Instruments (Details 1) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Estimated fair value, asset derivative	$ 100,520	$ 41,016
Estimated fair value, liability derivative	180,191	41,016
Netting adjustment - offsetting derivative assets/liabilities, estimated fair value, asset derivative	(2,476)	(3,228)
Netting adjustment - offsetting derivative assets/liabilities, estimated fair value, liability derivative	(2,476)	(3,228)
Netting adjustment - cash collateral received/posted, estimated fair value, asset derivative	(73,951)	0
Netting adjustment - cash collateral received/posted, estimated fair value, liability derivative	(69,107)	0
Asset Derivative		37,788
Liability Derivative		37,788
Interest rate swap | Cash Flow Hedging | Derivatives designated as hedges
Derivative [Line Items]
Notional Amount	3,000,000	0
Estimated fair value, asset derivative	357	0
Estimated fair value, liability derivative	80,135	0
Interest rate swap | Customer-Initiated and Other Derivatives | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	3,989,586	3,536,090
Estimated fair value, asset derivative	86,138	40,922
Estimated fair value, liability derivative	86,138	40,922
Caps and floors written | Customer-Initiated and Other Derivatives | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	130,415	191,291
Estimated fair value, asset derivative	0	94
Estimated fair value, liability derivative	1,489	0
Caps and floors purchased | Customer-Initiated and Other Derivatives | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	130,415	191,291
Estimated fair value, asset derivative	1,489	0
Estimated fair value, liability derivative	0	94
Forward contracts | Customer-Initiated and Other Derivatives | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	1,025,581	0
Estimated fair value, asset derivative	12,536	0
Estimated fair value, liability derivative	$ 12,429	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments Derivative Financial Instruments (Details 3) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) instrument	Sep. 30, 2022 USD ($) instrument	Dec. 31, 2021 USD ($) instrument
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 73,000	$ 73,000	$ 40,300
CashCollateralPostedForDerivativesInLiabilityPosition	$ 74,000	$ 74,000	$ 0
Risk participation agreement - participant bank
Derivative [Line Items]
Instruments held | instrument	18	18	7
Maximum exposure	$ 10,400	$ 10,400	$ 2,300
Notional Amount	$ 343,300	$ 343,300	$ 79,200
Risk participation agreement - lead bank
Derivative [Line Items]
Instruments held | instrument	17	17	15
Notional Amount	$ 201,100	$ 201,100	$ 156,100
Interest rate contract
Derivative [Line Items]
Unrealized losses to adjust cash flow hedges to fair value	78,200	77,900
Amount reclassified from AOCI into interest income on loans	1,800	2,500
Amount to be reclassified from AOCI within 12 months		$ 31,700
Maximum length of time hedged		4 years
Non-hedging derivatives | Commercial loan/lease
Derivative [Line Items]
Credit risk exposure, net of collateral pledged, relating to derivatives	$ 24,100	$ 24,100	$ 37,800

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance - Amount	$ 3,006,832	$ 3,114,957	$ 3,209,616	$ 2,871,224
Change in unrealized gain/(loss)	(207,204)	(18,131)	(494,261)	(71,501)
Amounts reclassified into net income	609	0	3,498	0
Total other comprehensive income/(loss)	(206,595)	(18,131)	(490,763)	(71,501)
Income tax expense/(benefit)	(43,384)	(3,808)	(103,059)	(15,015)
Total other comprehensive income/(loss), net of tax	(163,211)	(14,323)	(387,704)	(56,486)
Ending balance - Amount	2,885,775	3,147,752	2,885,775	3,147,752
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance - Amount	(272,208)	(26,389)	(47,715)	15,774
Ending balance - Amount	(435,419)	(40,712)	(435,419)	(40,712)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance - Amount	(316)	0	0	0
Change in unrealized gain/(loss)	(78,177)	0	(77,873)	0
Amounts reclassified into net income	(1,760)	0	(2,464)	0
Total other comprehensive income/(loss)	(79,937)	0	(80,337)	0
Income tax expense/(benefit)	(16,786)	0	(16,870)	0
Total other comprehensive income/(loss), net of tax	(63,151)	0	(63,467)	0
Ending balance - Amount	(63,467)	0	(63,467)	0
Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance - Amount	(220,090)	(26,389)	(47,715)	15,774
Change in unrealized gain/(loss)	(129,027)	(18,131)	(347,223)	(71,501)
Amounts reclassified into net income	0	0	0	0
Total other comprehensive income/(loss)	(129,027)	(18,131)	(347,223)	(71,501)
Income tax expense/(benefit)	(27,095)	(3,808)	(72,916)	(15,015)
Total other comprehensive income/(loss), net of tax	(101,932)	(14,323)	(274,307)	(56,486)
Ending balance - Amount	(322,022)	(40,712)	(322,022)	(40,712)
Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance - Amount	(51,802)	0	0	0
Change in unrealized gain/(loss)	0	0	(69,165)	0
Amounts reclassified into net income	2,369	0	5,962	0
Total other comprehensive income/(loss)	2,369	0	(63,203)	0
Income tax expense/(benefit)	497	0	(13,273)	0
Total other comprehensive income/(loss), net of tax	1,872	0	(49,930)	0
Ending balance - Amount	$ (49,930)	$ 0	$ (49,930)	$ 0