Texas Capital Bancshares (TCBI) 10-Q 20 Apr 23 2023 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2023	Apr. 19, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
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		47,869,688
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Central Index Key	0001077428
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
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

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 264,211	$ 233,637
Interest bearing cash and cash equivalents	3,385,494	4,778,623
Available-for-sale debt securities	3,394,293	2,615,644
Held-to-maturity debt securities	918,962	935,514
Equity securities	32,714	33,956
Investment securities	4,345,969	3,585,114
Loans held for sale	27,608	36,357
Loans held for investment, mortgage finance	4,060,570	4,090,033
Loans held for investment	16,014,497	15,197,307
Less: Allowance for credit losses on loans	(260,928)	(253,469)
Loans held for investment, net	19,814,139	19,033,871
Premises and equipment, net	25,268	26,382
Accrued interest receivable and other assets	732,468	719,162
Goodwill and intangibles, net	1,496	1,496
Total assets	28,596,653	28,414,642
Deposits [Abstract]
Non-interest bearing deposits	9,500,583	9,618,081
Interest bearing deposits	12,679,114	13,238,799
Total deposits	22,179,697	22,856,880
Accrued interest payable	31,198	24,000
Other liabilities	273,665	345,827
Short-term borrowings	2,100,000	1,201,142
Long-term debt	932,119	931,442
Total liabilities	25,516,679	25,359,291
Stockholders’ equity:
Preferred stock	300,000	300,000
Common stock	509	509
Additional paid-in capital	1,031,905	1,025,593
Retained earnings	2,297,850	2,263,502
Treasury stock - 3,095,444 and 2,083,535 shares at cost at March 31, 2023 and December 31, 2022, respectively	(175,528)	(115,310)
Accumulated other comprehensive loss, net of taxes	(374,762)	(418,943)
Total stockholders’ equity	3,079,974	3,055,351
Total liabilities and stockholders’ equity	$ 28,596,653	$ 28,414,642

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
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	50,947,306	50,867,298
Treasury stock, shares	3,095,444	2,083,535

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income
Interest and fees on loans	$ 297,438	$ 187,656
Investment securities	25,292	17,302
Interest bearing cash and cash equivalents	62,436	3,571
Total interest income	385,166	208,529
Interest expense
Deposits	120,094	13,630
Short-term borrowings	14,744	758
Long-term debt	14,983	10,595
Total interest expense	149,821	24,983
Net interest income	235,345	183,546
Provision for credit losses	28,000	(2,000)
Net interest income after provision for credit losses	207,345	185,546
Non-interest income
Service charges on deposit accounts	5,022	6,115
Wealth management and trust fee income	3,429	3,912
Brokered loan fees	1,895	3,970
Investment banking and trading income	18,768	4,179
Other	8,289	2,107
Total non-interest income	37,403	20,283
Non-interest expense
Salaries and benefits	128,670	99,859
Occupancy expense	9,619	8,885
Marketing	9,044	4,977
Legal and professional	14,514	10,302
Communications and technology	17,523	14,700
Federal Deposit Insurance Corporation insurance assessment	2,170	3,981
Other	12,487	10,388
Total non-interest expense	194,027	153,092
Income before income taxes	50,721	52,737
Income tax expense	12,060	13,087
Net income	38,661	39,650
Preferred stock dividends	(4,313)	(4,313)
Net income available to common stockholders	34,348	35,337
Other comprehensive income/(loss):
Change in unrealized gain/(loss)	42,953	(200,619)
Amounts reclassified into net income	12,973	986
Other comprehensive income/(loss)	55,926	(199,633)
Income tax expense/(benefit)	11,745	(41,923)
Other comprehensive income/(loss), net of tax	44,181	(157,710)
Comprehensive income/(loss)	$ 82,842	$ (118,060)
Basic earnings per common share
Basic earnings per common share	$ 0.71	$ 0.70
Diluted earnings per common share
Diluted earnings per common share	$ 0.70	$ 0.69

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income
Beginning balance, preferred stock (in shares) at Dec. 31, 2021		300,000
Beginning balance, common stock (in shares) at Dec. 31, 2021			50,618,911
Beginning balance, treasury stock (in shares) at Dec. 31, 2021						417
Beginning balance at Dec. 31, 2021	$ 3,209,616	$ 300,000	$ 506	$ 1,008,559	$ 1,948,274	$ (8)	$ (47,715)
Comprehensive income/(loss):
Net income	39,650				39,650
Change in other comprehensive income/(loss), net of taxes	(157,710)						(157,710)
Total comprehensive loss	(118,060)
Stock-based compensation expense recognized in earnings	5,407			5,407
Preferred stock dividend	(4,313)				(4,313)
Issuance of stock related to stock-based awards (in shares)			91,947
Issuance of stock related to stock-based awards	(2,612)		$ 1	(2,613)
Ending balance, preferred stock (in shares) at Mar. 31, 2022		300,000
Ending balance, common stock (in shares) at Mar. 31, 2022			50,710,858
Ending balance, treasury stock (in shares) at Mar. 31, 2022						417
Ending balance at Mar. 31, 2022	$ 3,090,038	$ 300,000	$ 507	1,011,353	1,983,611	$ (8)	(205,425)
Beginning balance, preferred stock (in shares) at Dec. 31, 2022		300,000
Beginning balance, common stock (in shares) at Dec. 31, 2022			50,867,298
Beginning balance, treasury stock (in shares) at Dec. 31, 2022	2,083,535					2,083,535
Beginning balance at Dec. 31, 2022	$ 3,055,351	$ 300,000	$ 509	1,025,593	2,263,502	$ (115,310)	(418,943)
Comprehensive income/(loss):
Net income	38,661				38,661
Change in other comprehensive income/(loss), net of taxes	44,181						44,181
Total comprehensive loss	82,842
Stock-based compensation expense recognized in earnings	8,438			8,438
Preferred stock dividend	(4,313)				(4,313)
Issuance of stock related to stock-based awards (in shares)			80,008
Issuance of stock related to stock-based awards	(2,126)		$ 0	(2,126)
Repurchase of common stock (shares)						(1,011,909)
Repurchase of common stock	$ (60,218)					$ (60,218)
Ending balance, preferred stock (in shares) at Mar. 31, 2023		300,000
Ending balance, common stock (in shares) at Mar. 31, 2023			50,947,306
Ending balance, treasury stock (in shares) at Mar. 31, 2023	3,095,444					3,095,444
Ending balance at Mar. 31, 2023	$ 3,079,974	$ 300,000	$ 509	$ 1,031,905	$ 2,297,850	$ (175,528)	$ (374,762)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net income	$ 38,661	$ 39,650
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Provision for credit losses	28,000	(2,000)
Depreciation and amortization	8,683	10,604
Net gain recognized on investment securities	(1,734)	0
Stock-based compensation expense	8,438	5,588
Proceeds from sales and repayments of loans held for sale	8,749	571
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(28,286)	43,200
Accrued interest payable and other liabilities	(44,308)	(24,691)
Net cash provided by operating activities	18,203	72,922
Investing activities
Purchases of available-for-sale securities	(849,391)	(376,415)
Proceeds from sales of available-for-sale debt securities	56,923	0
Proceeds from maturities, redemptions and pay-downs of available-for-sale debt securities	45,716	104,338
Proceeds from maturities, redemptions and pay-downs of held-to-maturity debt securities	17,489	9,882
Sales/(purchases) of equity securities, net	2,487	940
Originations of loans held for investment, mortgage finance	(14,897,110)	(26,902,960)
Proceeds from pay-offs of loans held for investment, mortgage finance	14,926,573	28,550,492
Net increase in loans held for investment, excluding mortgage finance loans	(837,100)	(517,465)
Purchase of premises and equipment, net	(1,363)	(2,709)
Net cash provided by/(used in) investing activities	(1,535,776)	866,103
Financing activities
Net decrease in deposits	(677,183)	(2,731,427)
Issuance of stock related to stock-based awards	(2,126)	(2,612)
Preferred dividends paid	(4,313)	(4,313)
Repurchase of common stock	(60,218)	0
Redemption of long-term debt	898,858	(775,799)
Net cash provided by/(used in) financing activities	155,018	(3,514,151)
Net decrease in cash and cash equivalents	(1,362,555)	(2,575,126)
Cash and cash equivalents at beginning of period	5,012,260	7,946,659
Cash and cash equivalents at end of period	3,649,705	5,371,533
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	142,623	24,122
Cash paid during the period for income taxes	451	302
Transfers of debt securities from available-for-sale to held-to-maturity	$ 0	$ 1,019,365

Operations and Summary of Signi

Operations and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2023
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. (“TCBI” or the “Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements include the accounts of TCBI and its wholly owned subsidiary, Texas Capital Bank (the “Bank”). The Company serves the needs of commercial businesses, entrepreneurs and professionals located in Texas through a custom array of financial products and services with high-quality personal service. Basis of Presentation The Company’s 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, 2022, included in our Annual Report on Form 10-K for the year ended December 31, 2022 (the “2022 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.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table presents the computation of basic and diluted earnings per share: Three Months Ended March 31, (in thousands except share and per share data) 2023 2022 Numerator: Net income $ 38,661 $ 39,650 Preferred stock dividends 4,313 4,313 Net income available to common stockholders $ 34,348 $ 35,337 Denominator: Denominator for basic earnings per common share—weighted average common shares 48,264,121 50,667,090 Effect of dilutive outstanding stock-settled awards 616,604 656,937 Denominator for dilutive earnings per common share—weighted average diluted common shares 48,880,725 51,324,027 Basic earnings per common share $ 0.71 $ 0.70 Diluted earnings per common share $ 0.70 $ 0.69 Anti-dilutive outstanding stock-settled awards 252,308 229,488

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following is a summary of the Company’s investment securities: (in thousands) Amortized Gross Gross Estimated March 31, 2023 Available-for-sale debt securities: U.S. Treasury securities $ 644,697 $ — $ (21,385) $ 623,312 U.S. government agency securities 125,000 — (20,883) 104,117 Residential mortgage-backed securities 2,965,866 1,077 (312,007) 2,654,936 CRT securities 14,507 — (2,579) 11,928 Total available-for-sale debt securities 3,750,070 1,077 (356,854) 3,394,293 Held-to-maturity debt securities: Residential mortgage-backed securities 918,962 — (107,431) 811,531 Total held-to-maturity debt securities 918,962 — (107,431) 811,531 Equity securities 32,714 Total investment securities(2) $ 4,345,969 December 31, 2022 Available-for-sale debt securities: U.S. Treasury securities $ 698,769 $ — $ (28,187) $ 670,582 U.S. government agency securities 125,000 — (22,846) 102,154 Residential mortgage-backed securities 2,162,364 3 (331,320) 1,831,047 CRT securities 14,713 — (2,852) 11,861 Total available-for-sale debt securities 3,000,846 3 (385,205) 2,615,644 Held-to-maturity securities: Residential mortgage-backed securities 935,514 — (118,600) 816,914 Total held-to-maturity securities 935,514 — (118,600) 816,914 Equity securities 33,956 Total investment securities(2) $ 3,585,114 (1) Excludes accrued interest receivable of $8.4 million and $6.6 million at March 31, 2023 and December 31, 2022, respectively, related to available-for-sale debt securities and $1.5 million and $1.5 million at March 31, 2023 and December 31, 2022, respectively, 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 2023, the Company sold U.S. Treasury securities with an amortized cost of $56.4 million and realized a gain of $489,000. The amortized cost and estimated fair value as of March 31, 2023, 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 $ 250,900 $ 243,554 $ — $ — Due after one year through five years 443,798 422,944 — — Due after five years through ten years 106,319 87,120 — — Due after ten years 2,949,053 2,640,675 918,962 811,531 Total $ 3,750,070 $ 3,394,293 $ 918,962 $ 811,531 The following table discloses the Company’s available-for-sale debt securities that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 or more months: Less Than 12 Months 12 Months or Longer Total (in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss March 31, 2023 U.S. Treasury securities $ 261,821 $ (5,170) $ 361,491 $ (16,215) $ 623,312 $ (21,385) U.S. government agency securities — — 104,117 (20,883) 104,117 (20,883) Residential mortgage-backed securities 947,217 (10,451) 1,593,098 (301,556) 2,540,315 (312,007) CRT securities — — 11,928 (2,579) 11,928 (2,579) Total $ 1,209,038 $ (15,621) $ 2,070,634 $ (341,233) $ 3,279,672 $ (356,854) December 31, 2022 U.S. Treasury securities $ 670,582 $ (28,187) $ — $ — $ 670,582 $ (28,187) U.S. government agency securities — — 102,154 (22,846) 102,154 (22,846) Residential mortgage-backed securities 261,502 (9,481) 1,569,107 (321,839) 1,830,609 (331,320) CRT securities — — 11,861 (2,852) 11,861 (2,852) Total $ 932,084 $ (37,668) $ 1,683,122 $ (347,537) $ 2,615,206 $ (385,205) At March 31, 2023, the Company had 109 available-for-sale debt securities in an unrealized loss position, comprised of 11 U.S. Treasury securities, five U.S. government agency securities, 91 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. The Company does not currently intend to sell and based on current conditions it does not believe it is likely that the Company 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 has, therefore recorded the unrealized losses related to this portfolio in AOCI. Held-to-maturity securities consist of government guaranteed securities for which no loss is expected. At March 31, 2023 and December 31, 2022, no allowance for credit losses was established for available-for-sale or held-to-maturity debt securities. Debt securities with carrying values of approximately $1.6 billion and $1.7 million were pledged to secure certain customer repurchase agreements and deposits, respectively, at March 31, 2023. The comparative amounts at December 31, 2022 were $16.1 million and $1.4 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 the Company’s 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: Three Months Ended March 31, (in thousands) 2023 2022 Net gains/(losses) recognized during the period $ 1,245 $ (3,640) Less: Realized net gains/(losses) recognized on securities sold (596) 202 Unrealized net gains/(losses) recognized on securities still held $ 1,841 $ (3,842)

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	3 Months Ended
	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [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) March 31, 2023 December 31, 2022 Loans held for investment(1): Commercial $ 9,514,781 $ 8,902,948 Energy 1,294,671 1,159,296 Mortgage finance 4,060,570 4,090,033 Real estate 5,272,443 5,198,643 Gross loans held for investment 20,142,465 19,350,920 Unearned income (net of direct origination costs) (67,398) (63,580) Total loans held for investment 20,075,067 19,287,340 Allowance for credit losses on loans (260,928) (253,469) Total loans held for investment, net $ 19,814,139 $ 19,033,871 Loans held for sale: Non-mortgage loans, at lower of cost or fair value 27,608 36,357 Total loans held for sale $ 27,608 $ 36,357 (1) Excludes accrued interest receivable of $100.0 million and $100.4 million at March 31, 2023 and December 31, 2022, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets. The following tables summarize gross loans held for investment by year of origination and internally assigned credit grades: (in thousands) 2023 2022 2021 2020 2019 2018 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total March 31, 2023 Commercial (1-7) Pass $ 668,265 $ 1,913,280 $ 594,666 $ 192,154 $ 186,922 $ 440,995 $ 5,079,665 $ 19,786 $ 9,095,733 (8) Special mention 95 47,169 18,690 1,399 61,187 12,025 67,354 1,860 209,779 (9) Substandard - accruing — 18,298 39,079 1,649 3,295 24,755 34,358 895 122,329 (9+) Non-accrual — 42,328 3,104 2,229 31,319 7,046 — 914 86,940 Total commercial $ 668,360 $ 2,021,075 $ 655,539 $ 197,431 $ 282,723 $ 484,821 $ 5,181,377 $ 23,455 $ 9,514,781 Energy (1-7) Pass $ 55,167 $ 114,845 $ — $ — $ — $ — $ 1,114,145 $ — $ 1,284,157 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — 7,037 — 7,037 (9+) Non-accrual — — — — — — — 3,477 3,477 Total energy $ 55,167 $ 114,845 $ — $ — $ — $ — $ 1,121,182 $ 3,477 $ 1,294,671 Mortgage finance (1-7) Pass $ 110,532 $ 29,682 $ 486,327 $ 261,183 $ 288,589 $ 2,884,257 $ — $ — $ 4,060,570 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 110,532 $ 29,682 $ 486,327 $ 261,183 $ 288,589 $ 2,884,257 $ — $ — $ 4,060,570 Real estate CRE (1-7) Pass $ 156,825 $ 1,199,143 $ 807,286 $ 492,723 $ 369,393 $ 450,333 $ 97,541 $ 10,924 $ 3,584,168 (8) Special mention — 2,650 5,847 29,802 — 24,926 — — 63,225 (9) Substandard - accruing — — 17,850 — — 29,860 — — 47,710 (9+) Non-accrual — — — — — 179 — — 179 RBF (1-7) Pass 17,975 88,017 52,541 10,180 1,636 4,966 281,514 — 456,829 (8) Special mention — 8,352 — — — — — — 8,352 (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 8,741 182,857 145,691 92,562 61,954 222,495 39,401 25,465 779,166 (8) Special mention — 720 — 6,161 — 376 — — 7,257 (9) Substandard - accruing — — — — — 442 — — 442 (9+) Non-accrual — — — 3,355 — — — — 3,355 Secured by 1-4 family (1-7) Pass 7,781 64,081 89,336 52,460 17,746 84,837 4,519 — 320,760 (8) Special mention — — — — — 1,000 — — 1,000 (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total real estate $ 191,322 $ 1,545,820 $ 1,118,551 $ 687,243 $ 450,729 $ 819,414 $ 422,975 $ 36,389 $ 5,272,443 Total $ 1,025,381 $ 3,711,422 $ 2,260,417 $ 1,145,857 $ 1,022,041 $ 4,188,492 $ 6,725,534 $ 63,321 $ 20,142,465 Gross charge-offs $ — $ 90 $ 19,828 $ — $ 262 $ 552 $ — $ — $ 20,732 (in thousands) 2022 2021 2020 2019 2018 2017 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total December 31, 2022 Commercial (1-7) Pass $ 1,903,529 $ 671,459 $ 244,568 $ 255,444 $ 325,201 $ 244,373 $ 4,877,753 $ 21,063 $ 8,543,390 (8) Special mention 9,141 7,740 3,628 37,794 11,998 4,975 95,310 2,250 172,836 (9) Substandard - accruing 18,670 71,147 514 1,666 14,933 6,305 30,070 — 143,305 (9+) Non-accrual 376 512 751 30,425 6,226 2,520 2,607 — 43,417 Total commercial $ 1,931,716 $ 750,858 $ 249,461 $ 325,329 $ 358,358 $ 258,173 $ 5,005,740 $ 23,313 $ 8,902,948 Energy (1-7) Pass $ 124,691 $ 12,517 $ — $ — $ — $ 3,317 $ 1,007,776 $ — $ 1,148,301 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — 7,337 — 7,337 (9+) Non-accrual — — — — — — 3,658 — 3,658 Total energy $ 124,691 $ 12,517 $ — $ — $ — $ 3,317 $ 1,018,771 $ — $ 1,159,296 Mortgage finance (1-7) Pass $ 30,485 $ 482,477 $ 197,045 $ 267,758 $ 464,753 $ 2,647,515 $ — $ — $ 4,090,033 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 30,485 $ 482,477 $ 197,045 $ 267,758 $ 464,753 $ 2,647,515 $ — $ — $ 4,090,033 Real estate CRE (1-7) Pass $ 1,085,254 $ 756,180 $ 563,341 $ 447,346 $ 183,634 $ 284,698 $ 97,337 $ 11,944 $ 3,429,734 (8) Special mention 2,765 6,524 37,791 5,295 19,350 3,652 — — 75,377 (9) Substandard - accruing — 17,850 — — 11,458 17,698 — — 47,006 (9+) Non-accrual — — — — — 182 — — 182 RBF (1-7) Pass 94,066 70,951 12,161 6,106 2,655 — 326,164 — 512,103 (8) Special mention — — — — — — — — — (9) Substandard - accruing 7,840 — — — — — — — 7,840 (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 182,840 131,538 94,611 67,518 76,951 163,838 42,333 31,293 790,922 (8) Special mention 729 — 8,721 — — 386 — — 9,836 (9) Substandard - accruing — — — 247 — 1,035 — — 1,282 (9+) Non-accrual — — 1,081 — — — — — 1,081 Secured by 1-4 family (1-7) Pass 64,050 89,967 53,003 24,314 16,953 70,082 4,911 — 323,280 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total real estate $ 1,437,544 $ 1,073,010 $ 770,709 $ 550,826 $ 311,001 $ 541,571 $ 470,745 $ 43,237 $ 5,198,643 Total $ 3,524,436 $ 2,318,862 $ 1,217,215 $ 1,143,913 $ 1,134,112 $ 3,450,576 $ 6,495,256 $ 66,550 $ 19,350,920 The following table details activity in the allowance for credit losses on loans. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Energy Mortgage Real Total Three Months Ended March 31, 2023 Beginning balance $ 136,841 $ 49,000 $ 10,745 $ 56,883 $ 253,469 Provision for credit losses on loans 32,475 1,930 (3,345) (3,691) 27,369 Charge-offs 20,732 — — — 20,732 Recoveries 816 6 — — 822 Net charge-offs (recoveries) 19,916 (6) — — 19,910 Ending balance $ 149,400 $ 50,936 $ 7,400 $ 53,192 $ 260,928 Three Months Ended March 31, 2022 Beginning balance $ 102,202 $ 52,568 $ 6,083 $ 51,013 $ 211,866 Provision for credit losses on loans 5,437 (24,522) 4,159 13,699 (1,227) Charge-offs 110 — — 350 460 Recoveries 217 755 — — 972 Net charge-offs (recoveries) (107) (755) — 350 (512) Ending balance $ 107,746 $ 28,801 $ 10,242 $ 64,362 $ 211,151 The Company recorded a $27.4 million provision for credit losses on loans for the three months ended March 31, 2023, compared to a $1.2 million negative provision for the same period of 2022. The $27.4 million provision for credit losses on loans resulted primarily from updated views on the downside risks to the economic forecast and increases in net charge-offs and criticized loans during the three months ended March 31, 2023. Net charge-offs of $19.9 million were recorded during the three months ended March 31, 2023, related primarily to a single commercial loan, compared to net recoveries of $512,000 during the same period of 2022. Criticized loans totaled $561.1 million at March 31, 2023, $513.2 million at December 31, 2022 and $476.1 million at March 31, 2022. A loan is considered collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. At March 31, 2023, the Company had $38.7 million in collateral-dependent commercial loans, collateralized by business assets, and $1.1 million in collateral-dependent real estate loans, collateralized by real estate property. The table below provides an age analysis of gross loans held for investment: (in thousands) 30-59 Days 60-89 Days 90 Days or More Past Due Total Past Non-accrual(1) Current Total Non-accrual With No Allowance March 31, 2023 Commercial $ 3,185 $ 242 $ 3,098 $ 6,525 $ 86,940 $ 9,421,316 $ 9,514,781 $ 71,999 Energy — — — — 3,477 1,291,194 1,294,671 3,477 Mortgage finance — — — — — 4,060,570 4,060,570 — Real estate CRE — — — — 179 3,695,103 3,695,282 — RBF — — — — — 465,181 465,181 — Other 430 — — 430 3,355 786,435 790,220 3,355 Secured by 1-4 family 2,388 — — 2,388 — 319,372 321,760 — Total $ 6,003 $ 242 $ 3,098 $ 9,343 $ 93,951 $ 20,039,171 $ 20,142,465 $ 78,831 (1) As of March 31, 2023, $2.1 million of non-accrual loans were earning interest income on a cash basis compared to $2.2 million as of December 31, 2022. We did not recognize interest income on non-accrual loans for the three months ended March 31, 2023 and March 31, 2022. Accrued interest of $1.5 million and $4,000 was reversed during the three months ended March 31, 2023 and March 31, 2022, respectively. Modifications to Borrowers Experiencing Financial Difficulty The Company adopted Accounting Standards Update (“ASU”) 2022-02, Financial Instruments - Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”) effective January 1, 2023. The amendments in ASU 2022-02 eliminated the recognition and measure of troubled debt restructurings and enhanced disclosures for loan modifications to borrowers experiencing financial difficulty. The table below details the amortized cost of gross loans held for investment made to borrowers experiencing financial difficulty that were modified during the three months ended March 31, 2023: (in thousands) Payment Term Payment Interest Rate Total Percentage of Commercial $ 31,431 $ 1,800 $ — $ 14,933 $ 48,164 0.24 % Energy — — 3,477 — 3,477 0.02 % Total $ 31,431 $ 1,800 $ 3,477 $ 14,933 $ 51,641 0.26 % The following table summarizes the financial impacts of loan modifications made to borrowers experiencing financial difficulty during the three months ended March 31, 2023: Interest Rate Term Extension Total Payment Commercial 0.70% 6 to 18 $ 3,523 Energy — 36 1,200 As of March 31, 2023, the Company did not have any loans made to borrowers experiencing financial difficulty that were modified during the first quarter of 2023 that subsequently defaulted. Payment default is defined as movement to nonperforming status, foreclosure or charge-off, whichever occurs first. The table below provides an age analysis of gross loans held for investment made to borrowers experiencing financial difficulty that were modified on or after January 1, 2023, the date we adopted ASU 2022-02: (in thousands) 30-89 Days 90+ Days Non-Accrual Current Total March 31, 2023 Commercial $ 161 $ — $ 924 $ 47,079 $ 48,164 Energy — — 3,477 — 3,477 Total $ 161 $ — $ 4,401 $ 47,079 $ 51,641 Troubled Debt Restructuring Disclosures Prior to the Adoption of ASU 2022-02 The Company did not have any loans that were restructured during the three months ended March 31, 2022. As of December 31, 2022 and March 31, 2022, the Company did not have any loans considered restructured that were not on non-accrual. Of the non-accrual loans at December 31, 2022 and March 31, 2022, $531,000 and $18.0 million, respectively, met the criteria for restructured. These loans had no unfunded commitments at their respective balance sheet dates.

Short-Term Borrowings and Long-

Short-Term Borrowings and Long-Term Debt	3 Months Ended
	Mar. 31, 2023
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) March 31, 2023 December 31, 2022 Customer repurchase agreements $ — $ 1,142 Federal Home Loan Bank borrowings 2,100,000 1,200,000 Total short-term borrowings $ 2,100,000 $ 1,201,142 The table below presents a summary of long-term debt: (in thousands) March 31, 2023 December 31, 2022 Bank-issued floating rate senior unsecured credit-linked notes due 2024 $ 272,994 $ 272,492 Bank-issued 5.25% fixed rate subordinated notes due 2026 174,262 174,196 Company-issued 4.00% fixed rate subordinated notes due 2031 371,457 371,348 Trust preferred floating rate subordinated debentures due 2032 to 2036 113,406 113,406 Total long-term debt $ 932,119 $ 931,442

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	3 Months Ended
	Mar. 31, 2023
Risks and Uncertainties [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial Instruments with Off-Balance Sheet Risk The table below presents the Company’s 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: Three Months Ended March 31, (in thousands) 2023 2022 Beginning balance of allowance for off-balance sheet credit losses $ 21,793 $ 17,265 Provision for off-balance sheet credit losses 631 (773) Ending balance of allowance for off-balance sheet credit losses $ 22,424 $ 16,492 (in thousands) March 31, 2023 December 31, 2022 Commitments to extend credit - period end balance $ 10,231,682 $ 9,673,082 Standby letters of credit - period end balance 436,057 417,896

Regulatory Ratios and Capital

Regulatory Ratios and Capital	3 Months Ended
	Mar. 31, 2023
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Ratios and Capital	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 the Company maintains 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 the Company’s common stock during the three months ended March 31, 2023 or 2022. In January 2023, the Company completed the full $150.0 million of repurchases authorized by the Company’s board of directors on April 19, 2022. On January 18, 2023, the Company’s board of directors authorized a new share repurchase program under which the Company may repurchase up to $150.0 million in shares of its outstanding common stock. During the three months ended March 31, 2023, the Company repurchased 1,011,909 shares of its common stock for an aggregate price of $59.7 million, at a weighted average price of $58.98 per share. The aggregate purchase price and weighted average price per share does not include the effect of excise tax incurred on net stock repurchases. 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). The Company adopted CECL on January 1, 2020 and have elected to utilize the five-year transition option. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of CET1, Tier 1 and total capital to risk-weighted assets, and of Tier 1 capital to average assets, each as defined in the regulations. Management believes, as of March 31, 2023, 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 Bank’s capital ratios exceeded the regulatory definition of well capitalized as of March 31, 2023 and December 31, 2022. The regulatory authorities can apply changes in the 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 Federal Deposit Insurance Corporation (“FDIC”) or could result in regulatory actions that could have a material effect on the Bank’s condition and results of operations. Because the Bank had less than $15.0 billion in total consolidated assets as of December 31, 2009, it is allowed to continue to classify the trust preferred securities, all of which were issued prior to May 19, 2010, as Tier 1 capital. At the beginning of each of the last five years of the life of the Bank-issued fixed rate subordinated notes due 2026, the amount that is eligible to be included in Tier 2 capital is reduced by 20% of the original amount of the notes (net of redemptions). In 2023, the amount of the notes that qualify as Tier 2 capital has been reduced by 60%. The table below summarizes the Company’s and the Bank’s actual and required capital ratios under the Basel III Capital Rules. The ratios presented below include the effects of the 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 March 31, 2023 CET1 Company $ 3,157,937 12.42 % $ 1,779,755 7.00 % N/A N/A Bank 3,454,486 13.61 % 1,776,757 7.00 % 1,649,845 6.50 % Total capital (to risk-weighted assets) Company 4,285,396 16.86 % 2,669,633 10.50 % 2,542,507 10.00 % Bank 4,010,488 15.80 % 2,665,135 10.50 % 2,538,224 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,567,937 14.03 % 2,161,131 8.50 % 1,525,504 6.00 % Bank 3,614,486 14.24 % 2,157,490 8.50 % 2,030,579 8.00 % Tier 1 capital (to average assets)(1) Company 3,567,937 12.03 % 1,186,723 4.00 % N/A N/A Bank 3,614,486 12.20 % 1,185,349 4.00 % 1,481,686 5.00 % December 31, 2022 CET1 Company $ 3,180,208 13.00 % $ 1,712,608 7.00 % N/A N/A Bank 3,408,178 13.95 % 1,710,056 7.00 % 1,587,909 6.50 % Total capital (to risk-weighted assets) Company 4,331,098 17.70 % 2,568,912 10.50 % 2,446,583 10.00 % Bank 3,987,720 16.32 % 2,565,083 10.50 % 2,442,937 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,590,208 14.67 % 2,079,595 8.50 % 1,467,950 6.00 % Bank 3,568,178 14.61 % 2,076,496 8.50 % 1,954,349 8.00 % Tier 1 capital (to average assets)(1) Company 3,590,208 11.54 % 1,244,494 4.00 % N/A N/A Bank 3,568,178 11.48 % 1,243,232 4.00 % 1,554,039 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, as applicable, the fully phased-in 2.5% CET1 capital buffer under the Basel III Capital Rules. The Company is required to maintain reserve balances in cash and on deposit with the Federal Reserve based on a percentage of transactional deposits; however, the Federal Reserve reduced the reserve requirement ratio to zero effective March 26, 2020, therefore the total requirement was zero at both March 31, 2023 and December 31, 2022.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2023
Compensation Related Costs [Abstract]
Stock-Based Compensation	Stock-Based CompensationWe 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. The table below summarizes our stock-based compensation expense: Three Months Ended March 31, (in thousands) 2023 2022 Stock-settled awards: RSUs $ 8,438 $ 5,407 Cash-settled units — 181 Total $ 8,438 $ 5,588 (in thousands except period data) March 31, 2023 Unrecognized compensation expense related to unvested stock-settled awards $ 46,870 Weighted average period over which expense is expected to be recognized, in years 2.5

Fair Value Disclosures

Fair Value Disclosures	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures The Company determines the fair market values of its assets and liabilities measured at fair value on a recurring and nonrecurring basis using the fair value hierarchy as prescribed in ASC 820. See Note 1 - Operations and Summary of Significant Accounting Policies in our 2022 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 statements. Assets and liabilities measured at fair value are as follows: Fair Value Measurements Using (in thousands) Level 1 Level 2 Level 3 March 31, 2023 Available-for-sale debt securities:(1) U.S. Treasury securities $ 623,312 $ — $ — U.S. government agency securities — 104,117 — Residential mortgage-backed securities — 2,654,936 — CRT securities — — 11,928 Equity securities(1)(2) 21,548 11,166 — Loans held for investment(3) — — 35,458 Derivative assets(4) — 19,401 — Derivative liabilities(4) — 70,220 — Non-qualified deferred compensation plan liabilities(4) 19,778 — — December 31, 2022 Available-for-sale debt securities:(1) U.S. Treasury securities $ 670,582 $ — $ — U.S. government agency securities — 102,154 — Residential mortgage-backed securities — 1,831,047 — CRT securities — — 11,861 Equity securities(1)(2) 22,879 11,077 — Derivative assets(4) — 13,504 — Derivative liabilities(4) — 91,758 — Non-qualified deferred compensation plan liabilities(4) 21,177 — — (1) Investment securities are measured at fair value on a recurring basis, generally monthly. (2) Equity securities consist of investments that qualify for consideration under the regulations implementing the Community Reinvestment Act and investments related to non-qualified deferred compensation plan. (3) Includes certain collateral-dependent loans held for investment for which a specific allocation of the allowance for credit losses is based upon the fair value of the loan’s underlying collateral. These loans held for investment are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions. (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 presents a reconciliation of the level 3 fair value category 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 March 31, 2023 Available-for-sale debt securities:(1) CRT securities $ 11,861 $ — $ — $ — $ 67 $ 11,928 Three Months Ended March 31, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 180,033 $ — $ (3,736) $ — $ (10,452) $ 165,845 CRT securities 11,846 — — — 55 11,901 Loans held for sale(2) 7,658 1,327 (571) — (329) 8,085 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI other non-interest income (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in other non-interest income CRT securities The fair value of CRT securities is based on a discounted cash flow model, which utilizes Level 3, or unobservable, inputs, the most significant of which were a discount rate and weighted-average life. At March 31, 2023, the discount rates utilized ranged from 5.43% to 11.37% and the weighted-average life ranged from 4.84 years to 8.42 years. On a combined amortized cost weighted-average basis a discount rate of 7.44% and a weighted-average life of 6.05 years were utilized to determine the fair value of these securities at March 31, 2023. At December 31, 2022, the combined weighted-average discount rate and weighted-average life utilized were 8.24% and 6.26 years, respectively. Loans held for investment Certain collateral-dependent loans held for investment are reported at fair value when, based upon an individual evaluation, the specific allocation of the allowance for credit losses that is deducted from the loan's amortized cost is based upon the fair value of the loan's underlying collateral. The $35.5 million fair value of loans held for investment at March 31, 2023 reported above includes impaired loans with a carrying value of $39.8 million that were reduced by specific allowance allocations totaling $4.3 million based on collateral valuations utilizing Level 3 inputs. There were no collateral-dependent loans held for investment reported at fair value at December 31, 2022. Fair Value of Financial Instruments A summary of the carrying amounts and estimated fair values of financial instruments is as follows: Carrying Estimated Fair Value (in thousands) Total Level 1 Level 2 Level 3 March 31, 2023 Financial assets: Cash and cash equivalents $ 3,649,705 $ 3,649,705 $ 3,649,705 $ — $ — Available-for-sale debt securities 3,394,293 3,394,293 623,312 2,759,053 11,928 Held-to-maturity debt securities 918,962 811,531 — 811,531 — Equity securities 32,714 32,714 21,548 11,166 — Loans held for sale 27,608 27,208 — 27,208 — Loans held for investment, net 19,814,139 19,755,693 — — 19,755,693 Derivative assets 19,401 19,401 — 19,401 — Financial liabilities: Total deposits 22,179,697 22,184,982 — — 22,184,982 Short-term borrowings 2,100,000 2,100,000 — 2,100,000 — Long-term debt 932,119 866,529 — 866,529 — Derivative liabilities 70,220 70,220 — 70,220 — December 31, 2022 Financial assets: Cash and cash equivalents $ 5,012,260 $ 5,012,260 $ 5,012,260 $ — $ — Available-for-sale debt securities 2,615,644 2,615,644 670,582 1,933,201 11,861 Held-to-maturity debt securities 935,514 816,914 — 816,914 — Equity securities 33,956 33,956 22,879 11,077 — Loans held for sale 36,357 36,357 — — 36,357 Loans held for investment, net 19,033,871 18,969,922 — — 18,969,922 Derivative assets 13,504 13,504 — 13,504 — Financial liabilities: Total deposits 22,856,880 22,857,949 — — 22,857,949 Short-term borrowings 1,201,142 1,201,142 — 1,201,142 — Long-term debt 931,442 881,716 — 881,716 — Derivative liabilities 91,758 91,758 — 91,758 —

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The notional amounts and estimated fair values of derivative positions outstanding are presented in the following table. March 31, 2023 December 31, 2022 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 $ 3,100,000 $ 1,658 $ 65,090 $ 3,000,000 $ — $ 86,378 Non-hedging derivatives Customer-initiated and other derivatives: Foreign currency forward contracts 2,682 13 — — — — Interest rate contracts: Swaps 4,527,001 70,881 70,881 4,396,367 83,529 83,529 Caps and floors written 168,065 — 2,238 220,142 — 2,583 Caps and floors purchased 168,065 2,238 — 220,142 2,583 — Forward contracts 4,486,001 12,755 12,167 1,569,326 4,431 4,053 Gross derivatives 87,545 150,376 90,543 176,543 Netting adjustment - offsetting derivative assets/liabilities (14,038) (14,038) (5,164) (5,164) Netting adjustment - cash collateral received/posted (54,106) (66,118) (71,875) (79,621) Net derivatives included on the consolidated balance sheets $ 19,401 $ 70,220 $ 13,504 $ 91,758 The Company’s 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. The Company’s credit exposure associated with these instruments, net of any collateral pledged, was approximately $19.4 million at March 31, 2023 and approximately $13.5 million at December 31, 2022. Collateral levels are monitored and adjusted on a regular basis for changes in the value of derivative instruments. At March 31, 2023, the Company had $135.6 million in cash collateral pledged to counterparties included in interest bearing cash and cash equivalents on the consolidated balance sheet and $57.0 million in cash collateral received from counterparties included in interest bearing deposits on the consolidated balance sheet. The comparative amounts at December 31, 2022, were $89.2 million in cash collateral pledged to counterparties and $72.5 million cash collateral received from counterparties. The Company also enters into credit risk participation agreements with financial institution counterparties for interest rate swaps related to loans in which the Company is either a participant or a lead bank. The risk participation agreements entered into by the Company 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. The Company is party to 18 risk participation agreements where it acts as a participant bank with a notional amount of $336.9 million at March 31, 2023, compared to 19 risk participation agreements with a notional amount of $291.2 million at December 31, 2022. The maximum estimated exposure to these agreements, assuming 100% default by all obligors, was approximately $6.6 million at March 31, 2023 and $8.9 million at December 31, 2022. The fair value of these exposures was insignificant to the consolidated financial statements at both March 31, 2023 and December 31, 2022. Risk participation agreements entered into by the Company as the lead bank provide credit protection should the borrower fail to perform on its interest rate derivative contract. The Company is party to 9 risk participation agreements where the Company acts as the lead bank having a notional amount of $124.7 million at March 31, 2023, compared to 18 agreements having a notional amount of $222.0 million at December 31, 2022. Derivatives Designated as Cash Flow Hedges The Company enters into interest rate derivative contracts that are 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. During the three months ended March 31, 2023, the Company recorded $13.5 million in unrealized losses to adjust its cash flow hedges to fair value, which was recorded net of tax to AOCI, and reclassified $11.1 million from AOCI into interest income on loans. Based on current market conditions, the Company estimates that during the next 12 months, an additional $50.3 million will be reclassified from AOCI as a decrease to interest income. As of March 31, 2023, the maximum length of time over which forecasted transactions are hedged is 3.50 years.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2023
Equity [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 March 31, 2023 Beginning balance $ (66,394) $ (304,309) $ (48,240) $ (418,943) Change in unrealized gain/(loss) 13,528 29,425 — 42,953 Amounts reclassified into net income 11,129 — 1,844 12,973 Total other comprehensive income/(loss) 24,657 29,425 1,844 55,926 Income tax expense/(benefit) 5,179 6,179 387 11,745 Total other comprehensive income/(loss), net of tax 19,478 23,246 1,457 44,181 Ending balance $ (46,916) $ (281,063) $ (46,783) $ (374,762) Three Months Ended March 31, 2022 Beginning balance $ — $ (47,715) $ — $ (47,715) Change in unrealized gain/(loss) — (131,454) (69,165) (200,619) Amounts reclassified into net income — — 986 986 Total other comprehensive income/(loss) — (131,454) (68,179) (199,633) Income tax expense/(benefit) — (27,605) (14,318) (41,923) Total other comprehensive income/(loss), net of tax — (103,849) (53,861) (157,710) Ending balance $ — $ (151,564) $ (53,861) $ (205,425)

New Accounting Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Standards	New Accounting Standards ASU 2023-01, “Leases (Topic 842) - Common Control Arrangements” (“ASU 2023-01”) requires entities to determine whether a related party arrangement between entities under common control is a lease. If the arrangement is determined to be a lease, an entity must classify and account for the lease on the same basis as an arrangement with a related party (on the basis of legally enforceable terms and conditions). ASU 2023-01 is effective January 1, 2024 and is not expected to have an impact on our financial statements. ASU 2023-02 “Investments - Equity Method and Join Ventures (Topic 323) - Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method” (“ASU 2023-02”) permits reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. ASU 2023-02 is effective January 1, 2024 and is not expected to have an impact on our financial statements.

Operations and Summary of Sig_2

Operations and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Business	Organization and Nature of Business Texas Capital Bancshares, Inc. (“TCBI” or the “Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements include the accounts of TCBI and its wholly owned subsidiary, Texas Capital Bank (the “Bank”). The Company serves the needs of commercial businesses, entrepreneurs and professionals located in Texas through a custom array of financial products and services with high-quality personal service.
Basis of Presentation	Basis of Presentation The Company’s 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, 2022, included in our Annual Report on Form 10-K for the year ended December 31, 2022 (the “2022 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.
New Accounting Standards	ASU 2023-01, “Leases (Topic 842) - Common Control Arrangements” (“ASU 2023-01”) requires entities to determine whether a related party arrangement between entities under common control is a lease. If the arrangement is determined to be a lease, an entity must classify and account for the lease on the same basis as an arrangement with a related party (on the basis of legally enforceable terms and conditions). ASU 2023-01 is effective January 1, 2024 and is not expected to have an impact on our financial statements. ASU 2023-02 “Investments - Equity Method and Join Ventures (Topic 323) - Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method” (“ASU 2023-02”) permits reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. ASU 2023-02 is effective January 1, 2024 and is not expected to have an impact on our financial statements.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted earnings per share	The following table presents the computation of basic and diluted earnings per share: Three Months Ended March 31, (in thousands except share and per share data) 2023 2022 Numerator: Net income $ 38,661 $ 39,650 Preferred stock dividends 4,313 4,313 Net income available to common stockholders $ 34,348 $ 35,337 Denominator: Denominator for basic earnings per common share—weighted average common shares 48,264,121 50,667,090 Effect of dilutive outstanding stock-settled awards 616,604 656,937 Denominator for dilutive earnings per common share—weighted average diluted common shares 48,880,725 51,324,027 Basic earnings per common share $ 0.71 $ 0.70 Diluted earnings per common share $ 0.70 $ 0.69 Anti-dilutive outstanding stock-settled awards 252,308 229,488

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Summary of Available-for-Sale Debt Securities	The following is a summary of the Company’s investment securities: (in thousands) Amortized Gross Gross Estimated March 31, 2023 Available-for-sale debt securities: U.S. Treasury securities $ 644,697 $ — $ (21,385) $ 623,312 U.S. government agency securities 125,000 — (20,883) 104,117 Residential mortgage-backed securities 2,965,866 1,077 (312,007) 2,654,936 CRT securities 14,507 — (2,579) 11,928 Total available-for-sale debt securities 3,750,070 1,077 (356,854) 3,394,293 Held-to-maturity debt securities: Residential mortgage-backed securities 918,962 — (107,431) 811,531 Total held-to-maturity debt securities 918,962 — (107,431) 811,531 Equity securities 32,714 Total investment securities(2) $ 4,345,969 December 31, 2022 Available-for-sale debt securities: U.S. Treasury securities $ 698,769 $ — $ (28,187) $ 670,582 U.S. government agency securities 125,000 — (22,846) 102,154 Residential mortgage-backed securities 2,162,364 3 (331,320) 1,831,047 CRT securities 14,713 — (2,852) 11,861 Total available-for-sale debt securities 3,000,846 3 (385,205) 2,615,644 Held-to-maturity securities: Residential mortgage-backed securities 935,514 — (118,600) 816,914 Total held-to-maturity securities 935,514 — (118,600) 816,914 Equity securities 33,956 Total investment securities(2) $ 3,585,114 (1) Excludes accrued interest receivable of $8.4 million and $6.6 million at March 31, 2023 and December 31, 2022, respectively, related to available-for-sale debt securities and $1.5 million and $1.5 million at March 31, 2023 and December 31, 2022, respectively, 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 March 31, 2023, 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 $ 250,900 $ 243,554 $ — $ — Due after one year through five years 443,798 422,944 — — Due after five years through ten years 106,319 87,120 — — Due after ten years 2,949,053 2,640,675 918,962 811,531 Total $ 3,750,070 $ 3,394,293 $ 918,962 $ 811,531
Schedule of Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position	The following table discloses the Company’s available-for-sale debt securities that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 or more months: Less Than 12 Months 12 Months or Longer Total (in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss March 31, 2023 U.S. Treasury securities $ 261,821 $ (5,170) $ 361,491 $ (16,215) $ 623,312 $ (21,385) U.S. government agency securities — — 104,117 (20,883) 104,117 (20,883) Residential mortgage-backed securities 947,217 (10,451) 1,593,098 (301,556) 2,540,315 (312,007) CRT securities — — 11,928 (2,579) 11,928 (2,579) Total $ 1,209,038 $ (15,621) $ 2,070,634 $ (341,233) $ 3,279,672 $ (356,854) December 31, 2022 U.S. Treasury securities $ 670,582 $ (28,187) $ — $ — $ 670,582 $ (28,187) U.S. government agency securities — — 102,154 (22,846) 102,154 (22,846) Residential mortgage-backed securities 261,502 (9,481) 1,569,107 (321,839) 1,830,609 (331,320) CRT securities — — 11,861 (2,852) 11,861 (2,852) Total $ 932,084 $ (37,668) $ 1,683,122 $ (347,537) $ 2,615,206 $ (385,205)
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: Three Months Ended March 31, (in thousands) 2023 2022 Net gains/(losses) recognized during the period $ 1,245 $ (3,640) Less: Realized net gains/(losses) recognized on securities sold (596) 202 Unrealized net gains/(losses) recognized on securities still held $ 1,841 $ (3,842)

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	3 Months Ended
	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of loans held for investments	Loans are summarized by portfolio segment as follows: (in thousands) March 31, 2023 December 31, 2022 Loans held for investment(1): Commercial $ 9,514,781 $ 8,902,948 Energy 1,294,671 1,159,296 Mortgage finance 4,060,570 4,090,033 Real estate 5,272,443 5,198,643 Gross loans held for investment 20,142,465 19,350,920 Unearned income (net of direct origination costs) (67,398) (63,580) Total loans held for investment 20,075,067 19,287,340 Allowance for credit losses on loans (260,928) (253,469) Total loans held for investment, net $ 19,814,139 $ 19,033,871 Loans held for sale: Non-mortgage loans, at lower of cost or fair value 27,608 36,357 Total loans held for sale $ 27,608 $ 36,357 (1) Excludes accrued interest receivable of $100.0 million and $100.4 million at March 31, 2023 and December 31, 2022, respectively, that is recorded in accrued interest receivable and other assets on the consolidated balance sheets.
Schedule of the credit risk profile of loan portfolio by internally assigned grades and nonaccrual status	The following tables summarize gross loans held for investment by year of origination and internally assigned credit grades: (in thousands) 2023 2022 2021 2020 2019 2018 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total March 31, 2023 Commercial (1-7) Pass $ 668,265 $ 1,913,280 $ 594,666 $ 192,154 $ 186,922 $ 440,995 $ 5,079,665 $ 19,786 $ 9,095,733 (8) Special mention 95 47,169 18,690 1,399 61,187 12,025 67,354 1,860 209,779 (9) Substandard - accruing — 18,298 39,079 1,649 3,295 24,755 34,358 895 122,329 (9+) Non-accrual — 42,328 3,104 2,229 31,319 7,046 — 914 86,940 Total commercial $ 668,360 $ 2,021,075 $ 655,539 $ 197,431 $ 282,723 $ 484,821 $ 5,181,377 $ 23,455 $ 9,514,781 Energy (1-7) Pass $ 55,167 $ 114,845 $ — $ — $ — $ — $ 1,114,145 $ — $ 1,284,157 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — 7,037 — 7,037 (9+) Non-accrual — — — — — — — 3,477 3,477 Total energy $ 55,167 $ 114,845 $ — $ — $ — $ — $ 1,121,182 $ 3,477 $ 1,294,671 Mortgage finance (1-7) Pass $ 110,532 $ 29,682 $ 486,327 $ 261,183 $ 288,589 $ 2,884,257 $ — $ — $ 4,060,570 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 110,532 $ 29,682 $ 486,327 $ 261,183 $ 288,589 $ 2,884,257 $ — $ — $ 4,060,570 Real estate CRE (1-7) Pass $ 156,825 $ 1,199,143 $ 807,286 $ 492,723 $ 369,393 $ 450,333 $ 97,541 $ 10,924 $ 3,584,168 (8) Special mention — 2,650 5,847 29,802 — 24,926 — — 63,225 (9) Substandard - accruing — — 17,850 — — 29,860 — — 47,710 (9+) Non-accrual — — — — — 179 — — 179 RBF (1-7) Pass 17,975 88,017 52,541 10,180 1,636 4,966 281,514 — 456,829 (8) Special mention — 8,352 — — — — — — 8,352 (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 8,741 182,857 145,691 92,562 61,954 222,495 39,401 25,465 779,166 (8) Special mention — 720 — 6,161 — 376 — — 7,257 (9) Substandard - accruing — — — — — 442 — — 442 (9+) Non-accrual — — — 3,355 — — — — 3,355 Secured by 1-4 family (1-7) Pass 7,781 64,081 89,336 52,460 17,746 84,837 4,519 — 320,760 (8) Special mention — — — — — 1,000 — — 1,000 (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total real estate $ 191,322 $ 1,545,820 $ 1,118,551 $ 687,243 $ 450,729 $ 819,414 $ 422,975 $ 36,389 $ 5,272,443 Total $ 1,025,381 $ 3,711,422 $ 2,260,417 $ 1,145,857 $ 1,022,041 $ 4,188,492 $ 6,725,534 $ 63,321 $ 20,142,465 Gross charge-offs $ — $ 90 $ 19,828 $ — $ 262 $ 552 $ — $ — $ 20,732 (in thousands) 2022 2021 2020 2019 2018 2017 and prior Revolving lines of credit Revolving lines of credit converted to term loans Total December 31, 2022 Commercial (1-7) Pass $ 1,903,529 $ 671,459 $ 244,568 $ 255,444 $ 325,201 $ 244,373 $ 4,877,753 $ 21,063 $ 8,543,390 (8) Special mention 9,141 7,740 3,628 37,794 11,998 4,975 95,310 2,250 172,836 (9) Substandard - accruing 18,670 71,147 514 1,666 14,933 6,305 30,070 — 143,305 (9+) Non-accrual 376 512 751 30,425 6,226 2,520 2,607 — 43,417 Total commercial $ 1,931,716 $ 750,858 $ 249,461 $ 325,329 $ 358,358 $ 258,173 $ 5,005,740 $ 23,313 $ 8,902,948 Energy (1-7) Pass $ 124,691 $ 12,517 $ — $ — $ — $ 3,317 $ 1,007,776 $ — $ 1,148,301 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — 7,337 — 7,337 (9+) Non-accrual — — — — — — 3,658 — 3,658 Total energy $ 124,691 $ 12,517 $ — $ — $ — $ 3,317 $ 1,018,771 $ — $ 1,159,296 Mortgage finance (1-7) Pass $ 30,485 $ 482,477 $ 197,045 $ 267,758 $ 464,753 $ 2,647,515 $ — $ — $ 4,090,033 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 30,485 $ 482,477 $ 197,045 $ 267,758 $ 464,753 $ 2,647,515 $ — $ — $ 4,090,033 Real estate CRE (1-7) Pass $ 1,085,254 $ 756,180 $ 563,341 $ 447,346 $ 183,634 $ 284,698 $ 97,337 $ 11,944 $ 3,429,734 (8) Special mention 2,765 6,524 37,791 5,295 19,350 3,652 — — 75,377 (9) Substandard - accruing — 17,850 — — 11,458 17,698 — — 47,006 (9+) Non-accrual — — — — — 182 — — 182 RBF (1-7) Pass 94,066 70,951 12,161 6,106 2,655 — 326,164 — 512,103 (8) Special mention — — — — — — — — — (9) Substandard - accruing 7,840 — — — — — — — 7,840 (9+) Non-accrual — — — — — — — — — Other (1-7) Pass 182,840 131,538 94,611 67,518 76,951 163,838 42,333 31,293 790,922 (8) Special mention 729 — 8,721 — — 386 — — 9,836 (9) Substandard - accruing — — — 247 — 1,035 — — 1,282 (9+) Non-accrual — — 1,081 — — — — — 1,081 Secured by 1-4 family (1-7) Pass 64,050 89,967 53,003 24,314 16,953 70,082 4,911 — 323,280 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total real estate $ 1,437,544 $ 1,073,010 $ 770,709 $ 550,826 $ 311,001 $ 541,571 $ 470,745 $ 43,237 $ 5,198,643 Total $ 3,524,436 $ 2,318,862 $ 1,217,215 $ 1,143,913 $ 1,134,112 $ 3,450,576 $ 6,495,256 $ 66,550 $ 19,350,920
Schedule of activity in the reserve for loan losses by portfolio segment	The following table details activity in the allowance for credit losses on loans. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Energy Mortgage Real Total Three Months Ended March 31, 2023 Beginning balance $ 136,841 $ 49,000 $ 10,745 $ 56,883 $ 253,469 Provision for credit losses on loans 32,475 1,930 (3,345) (3,691) 27,369 Charge-offs 20,732 — — — 20,732 Recoveries 816 6 — — 822 Net charge-offs (recoveries) 19,916 (6) — — 19,910 Ending balance $ 149,400 $ 50,936 $ 7,400 $ 53,192 $ 260,928 Three Months Ended March 31, 2022 Beginning balance $ 102,202 $ 52,568 $ 6,083 $ 51,013 $ 211,866 Provision for credit losses on loans 5,437 (24,522) 4,159 13,699 (1,227) Charge-offs 110 — — 350 460 Recoveries 217 755 — — 972 Net charge-offs (recoveries) (107) (755) — 350 (512) Ending balance $ 107,746 $ 28,801 $ 10,242 $ 64,362 $ 211,151
Schedule of an age analysis of accruing past due loans	The table below provides an age analysis of gross loans held for investment: (in thousands) 30-59 Days 60-89 Days 90 Days or More Past Due Total Past Non-accrual(1) Current Total Non-accrual With No Allowance March 31, 2023 Commercial $ 3,185 $ 242 $ 3,098 $ 6,525 $ 86,940 $ 9,421,316 $ 9,514,781 $ 71,999 Energy — — — — 3,477 1,291,194 1,294,671 3,477 Mortgage finance — — — — — 4,060,570 4,060,570 — Real estate CRE — — — — 179 3,695,103 3,695,282 — RBF — — — — — 465,181 465,181 — Other 430 — — 430 3,355 786,435 790,220 3,355 Secured by 1-4 family 2,388 — — 2,388 — 319,372 321,760 — Total $ 6,003 $ 242 $ 3,098 $ 9,343 $ 93,951 $ 20,039,171 $ 20,142,465 $ 78,831 (1) As of March 31, 2023, $2.1 million of non-accrual loans were earning interest income on a cash basis compared to $2.2 million as of December 31, 2022. We did not recognize interest income on non-accrual loans for the three months ended March 31, 2023 and March 31, 2022. Accrued interest of $1.5 million and $4,000 was reversed during the three months ended March 31, 2023 and March 31, 2022, respectively.
Summary of loan modifications	The table below details the amortized cost of gross loans held for investment made to borrowers experiencing financial difficulty that were modified during the three months ended March 31, 2023: (in thousands) Payment Term Payment Interest Rate Total Percentage of Commercial $ 31,431 $ 1,800 $ — $ 14,933 $ 48,164 0.24 % Energy — — 3,477 — 3,477 0.02 % Total $ 31,431 $ 1,800 $ 3,477 $ 14,933 $ 51,641 0.26 % The following table summarizes the financial impacts of loan modifications made to borrowers experiencing financial difficulty during the three months ended March 31, 2023: Interest Rate Term Extension Total Payment Commercial 0.70% 6 to 18 $ 3,523 Energy — 36 1,200 The table below provides an age analysis of gross loans held for investment made to borrowers experiencing financial difficulty that were modified on or after January 1, 2023, the date we adopted ASU 2022-02: (in thousands) 30-89 Days 90+ Days Non-Accrual Current Total March 31, 2023 Commercial $ 161 $ — $ 924 $ 47,079 $ 48,164 Energy — — 3,477 — 3,477 Total $ 161 $ — $ 4,401 $ 47,079 $ 51,641

Short-Term Borrowings and Lon_2

Short-Term Borrowings and Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Summary of borrowings	The table below presents a summary of short-term borrowings: (in thousands) March 31, 2023 December 31, 2022 Customer repurchase agreements $ — $ 1,142 Federal Home Loan Bank borrowings 2,100,000 1,200,000 Total short-term borrowings $ 2,100,000 $ 1,201,142
Summary of significant terms of preferred subordinated debentures	The table below presents a summary of long-term debt: (in thousands) March 31, 2023 December 31, 2022 Bank-issued floating rate senior unsecured credit-linked notes due 2024 $ 272,994 $ 272,492 Bank-issued 5.25% fixed rate subordinated notes due 2026 174,262 174,196 Company-issued 4.00% fixed rate subordinated notes due 2031 371,457 371,348 Trust preferred floating rate subordinated debentures due 2032 to 2036 113,406 113,406 Total long-term debt $ 932,119 $ 931,442

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Tables)	3 Months Ended
	Mar. 31, 2023
Risks and Uncertainties [Abstract]
Schedule of financial instruments with off-balance sheet risk	The table below presents the Company’s 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: Three Months Ended March 31, (in thousands) 2023 2022 Beginning balance of allowance for off-balance sheet credit losses $ 21,793 $ 17,265 Provision for off-balance sheet credit losses 631 (773) Ending balance of allowance for off-balance sheet credit losses $ 22,424 $ 16,492 (in thousands) March 31, 2023 December 31, 2022 Commitments to extend credit - period end balance $ 10,231,682 $ 9,673,082 Standby letters of credit - period end balance 436,057 417,896

Regulatory Ratios and Capital (

Regulatory Ratios and Capital (Tables)	3 Months Ended
	Mar. 31, 2023
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of compliance with Regulatory Capital Requirements	The table below summarizes the Company’s and the Bank’s actual and required capital ratios under the Basel III Capital Rules. The ratios presented below include the effects of the 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 March 31, 2023 CET1 Company $ 3,157,937 12.42 % $ 1,779,755 7.00 % N/A N/A Bank 3,454,486 13.61 % 1,776,757 7.00 % 1,649,845 6.50 % Total capital (to risk-weighted assets) Company 4,285,396 16.86 % 2,669,633 10.50 % 2,542,507 10.00 % Bank 4,010,488 15.80 % 2,665,135 10.50 % 2,538,224 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,567,937 14.03 % 2,161,131 8.50 % 1,525,504 6.00 % Bank 3,614,486 14.24 % 2,157,490 8.50 % 2,030,579 8.00 % Tier 1 capital (to average assets)(1) Company 3,567,937 12.03 % 1,186,723 4.00 % N/A N/A Bank 3,614,486 12.20 % 1,185,349 4.00 % 1,481,686 5.00 % December 31, 2022 CET1 Company $ 3,180,208 13.00 % $ 1,712,608 7.00 % N/A N/A Bank 3,408,178 13.95 % 1,710,056 7.00 % 1,587,909 6.50 % Total capital (to risk-weighted assets) Company 4,331,098 17.70 % 2,568,912 10.50 % 2,446,583 10.00 % Bank 3,987,720 16.32 % 2,565,083 10.50 % 2,442,937 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,590,208 14.67 % 2,079,595 8.50 % 1,467,950 6.00 % Bank 3,568,178 14.61 % 2,076,496 8.50 % 1,954,349 8.00 % Tier 1 capital (to average assets)(1) Company 3,590,208 11.54 % 1,244,494 4.00 % N/A N/A Bank 3,568,178 11.48 % 1,243,232 4.00 % 1,554,039 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, as applicable, the fully phased-in 2.5% CET1 capital buffer under the Basel III Capital Rules.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2023
Compensation Related Costs [Abstract]
Schedule of stock-based compensation costs	The table below summarizes our stock-based compensation expense: Three Months Ended March 31, (in thousands) 2023 2022 Stock-settled awards: RSUs $ 8,438 $ 5,407 Cash-settled units — 181 Total $ 8,438 $ 5,588
Schedule of unrecognized compensation costs	(in thousands except period data) March 31, 2023 Unrecognized compensation expense related to unvested stock-settled awards $ 46,870 Weighted average period over which expense is expected to be recognized, in years 2.5

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value	Assets and liabilities measured at fair value are as follows: Fair Value Measurements Using (in thousands) Level 1 Level 2 Level 3 March 31, 2023 Available-for-sale debt securities:(1) U.S. Treasury securities $ 623,312 $ — $ — U.S. government agency securities — 104,117 — Residential mortgage-backed securities — 2,654,936 — CRT securities — — 11,928 Equity securities(1)(2) 21,548 11,166 — Loans held for investment(3) — — 35,458 Derivative assets(4) — 19,401 — Derivative liabilities(4) — 70,220 — Non-qualified deferred compensation plan liabilities(4) 19,778 — — December 31, 2022 Available-for-sale debt securities:(1) U.S. Treasury securities $ 670,582 $ — $ — U.S. government agency securities — 102,154 — Residential mortgage-backed securities — 1,831,047 — CRT securities — — 11,861 Equity securities(1)(2) 22,879 11,077 — Derivative assets(4) — 13,504 — Derivative liabilities(4) — 91,758 — Non-qualified deferred compensation plan liabilities(4) 21,177 — — (1) Investment securities are measured at fair value on a recurring basis, generally monthly. (2) Equity securities consist of investments that qualify for consideration under the regulations implementing the Community Reinvestment Act and investments related to non-qualified deferred compensation plan. (3) Includes certain collateral-dependent loans held for investment for which a specific allocation of the allowance for credit losses is based upon the fair value of the loan’s underlying collateral. These loans held for investment are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions. (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 Fair Value Assets Measured on a Recurring Basis	The following table presents a reconciliation of the level 3 fair value category 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 March 31, 2023 Available-for-sale debt securities:(1) CRT securities $ 11,861 $ — $ — $ — $ 67 $ 11,928 Three Months Ended March 31, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 180,033 $ — $ (3,736) $ — $ (10,452) $ 165,845 CRT securities 11,846 — — — 55 11,901 Loans held for sale(2) 7,658 1,327 (571) — (329) 8,085 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI other non-interest income (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in other non-interest income
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: Carrying Estimated Fair Value (in thousands) Total Level 1 Level 2 Level 3 March 31, 2023 Financial assets: Cash and cash equivalents $ 3,649,705 $ 3,649,705 $ 3,649,705 $ — $ — Available-for-sale debt securities 3,394,293 3,394,293 623,312 2,759,053 11,928 Held-to-maturity debt securities 918,962 811,531 — 811,531 — Equity securities 32,714 32,714 21,548 11,166 — Loans held for sale 27,608 27,208 — 27,208 — Loans held for investment, net 19,814,139 19,755,693 — — 19,755,693 Derivative assets 19,401 19,401 — 19,401 — Financial liabilities: Total deposits 22,179,697 22,184,982 — — 22,184,982 Short-term borrowings 2,100,000 2,100,000 — 2,100,000 — Long-term debt 932,119 866,529 — 866,529 — Derivative liabilities 70,220 70,220 — 70,220 — December 31, 2022 Financial assets: Cash and cash equivalents $ 5,012,260 $ 5,012,260 $ 5,012,260 $ — $ — Available-for-sale debt securities 2,615,644 2,615,644 670,582 1,933,201 11,861 Held-to-maturity debt securities 935,514 816,914 — 816,914 — Equity securities 33,956 33,956 22,879 11,077 — Loans held for sale 36,357 36,357 — — 36,357 Loans held for investment, net 19,033,871 18,969,922 — — 18,969,922 Derivative assets 13,504 13,504 — 13,504 — Financial liabilities: Total deposits 22,856,880 22,857,949 — — 22,857,949 Short-term borrowings 1,201,142 1,201,142 — 1,201,142 — Long-term debt 931,442 881,716 — 881,716 — Derivative liabilities 91,758 91,758 — 91,758 —

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The notional amounts and estimated fair values of derivative positions outstanding are presented in the following table. March 31, 2023 December 31, 2022 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 $ 3,100,000 $ 1,658 $ 65,090 $ 3,000,000 $ — $ 86,378 Non-hedging derivatives Customer-initiated and other derivatives: Foreign currency forward contracts 2,682 13 — — — — Interest rate contracts: Swaps 4,527,001 70,881 70,881 4,396,367 83,529 83,529 Caps and floors written 168,065 — 2,238 220,142 — 2,583 Caps and floors purchased 168,065 2,238 — 220,142 2,583 — Forward contracts 4,486,001 12,755 12,167 1,569,326 4,431 4,053 Gross derivatives 87,545 150,376 90,543 176,543 Netting adjustment - offsetting derivative assets/liabilities (14,038) (14,038) (5,164) (5,164) Netting adjustment - cash collateral received/posted (54,106) (66,118) (71,875) (79,621) Net derivatives included on the consolidated balance sheets $ 19,401 $ 70,220 $ 13,504 $ 91,758

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2023
Equity [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 March 31, 2023 Beginning balance $ (66,394) $ (304,309) $ (48,240) $ (418,943) Change in unrealized gain/(loss) 13,528 29,425 — 42,953 Amounts reclassified into net income 11,129 — 1,844 12,973 Total other comprehensive income/(loss) 24,657 29,425 1,844 55,926 Income tax expense/(benefit) 5,179 6,179 387 11,745 Total other comprehensive income/(loss), net of tax 19,478 23,246 1,457 44,181 Ending balance $ (46,916) $ (281,063) $ (46,783) $ (374,762) Three Months Ended March 31, 2022 Beginning balance $ — $ (47,715) $ — $ (47,715) Change in unrealized gain/(loss) — (131,454) (69,165) (200,619) Amounts reclassified into net income — — 986 986 Total other comprehensive income/(loss) — (131,454) (68,179) (199,633) Income tax expense/(benefit) — (27,605) (14,318) (41,923) Total other comprehensive income/(loss), net of tax — (103,849) (53,861) (157,710) Ending balance $ — $ (151,564) $ (53,861) $ (205,425)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income	$ 38,661	$ 39,650
Preferred stock dividends	4,313	4,313
Net income available to common stockholders	$ 34,348	$ 35,337
Denominator:
Denominator for basic earnings per common share—weighted average common shares	48,264,121	50,667,090
Effect of employee stock-based awards	616,604	656,937
Denominator for dilutive earnings per common share—weighted average diluted common shares	48,880,725	51,324,027
Basic earnings per common share (in usd per share)	$ 0.71	$ 0.70
Diluted earnings per common share (in usd per share)	$ 0.70	$ 0.69
Anti-dilutive outstanding stock-settled awards	252,308	229,488

Investment Securities - Summary

Investment Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 3,750,070	$ 3,000,846
Gross Unrealized Gains	1,077	3
Gross Unrealized Losses	(356,854)	(385,205)
Estimated Fair Value	3,394,293	2,615,644
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Held-to-maturity debt securities	918,962	935,514
Equity securities at fair value	32,714	33,956
Total investment securities(2)	4,345,969	3,585,114
Interest receivable	100,000	100,400
Available-for-sale Securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	3,750,070
Estimated Fair Value	3,394,293
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Interest receivable	8,400	6,600
Held-to-Maturity Securities
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Estimated Fair Value	811,531
Interest receivable	1,500	1,500
US Treasury Securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	644,697	698,769
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(21,385)	(28,187)
Estimated Fair Value	623,312	670,582
U.S. government agency securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	125,000	125,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(20,883)	(22,846)
Estimated Fair Value	104,117	102,154
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	2,965,866	2,162,364
Gross Unrealized Gains	1,077	3
Gross Unrealized Losses	(312,007)	(331,320)
Estimated Fair Value	2,654,936	1,831,047
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Held-to-maturity debt securities	918,962	935,514
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(107,431)	(118,600)
Estimated Fair Value	811,531	816,914
CRT securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	14,507	14,713
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,579)	(2,852)
Estimated Fair Value	$ 11,928	$ 11,861

Investment Securities - Narrati

Investment Securities - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of securities in an unrealized loss position		109
Held-to-Maturity Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities transferred to held-to-maturity | $	$ 56,400
Realized gain | $	$ 489
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Number of securities in an unrealized loss position		11
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Number of securities in an unrealized loss position		5
CRT securities
Debt Securities, Available-for-sale [Line Items]
Number of securities in an unrealized loss position		2
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Number of securities in an unrealized loss position		91
Customer repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits | $		$ 1,600,000	$ 16,100
Deposits
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits | $		$ 1,700	$ 1,400

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Amortized Cost	$ 3,750,070	$ 3,000,846
Fair Value
Fair Value	3,394,293	$ 2,615,644
Available-for-sale Securities
Amortized Cost
Due within one year	250,900
Due after one year through five years	443,798
Due after five years through ten years	106,319
Due after ten years	2,949,053
Amortized Cost	3,750,070
Fair Value
Due within one year	243,554
Due after one year through five years	422,944
Due after five years through ten years	87,120
Due after ten years	2,640,675
Fair Value	3,394,293
Held-to-Maturity Securities
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	918,962
Amortized Cost	918,962
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	811,531
Fair Value	$ 811,531

Investment Securities - Sched_2

Investment Securities - Schedule of Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 1,209,038	$ 932,084
Less Than 12 Months, Unrealized Loss	(15,621)	(37,668)
12 Months or Longer, Fair Value	2,070,634	1,683,122
12 Months or Longer, Unrealized Loss	(341,233)	(347,537)
Total, Fair Value	3,279,672	2,615,206
Total, Unrealized Loss	(356,854)	(385,205)
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Unrealized Loss	0	0
12 Months or Longer, Fair Value	104,117	102,154
12 Months or Longer, Unrealized Loss	(20,883)	(22,846)
Total, Fair Value	104,117	102,154
Total, Unrealized Loss	(20,883)	(22,846)
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	947,217	261,502
Less Than 12 Months, Unrealized Loss	(10,451)	(9,481)
12 Months or Longer, Fair Value	1,593,098	1,569,107
12 Months or Longer, Unrealized Loss	(301,556)	(321,839)
Total, Fair Value	2,540,315	1,830,609
Total, Unrealized Loss	(312,007)	(331,320)
CRT securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Unrealized Loss	0	0
12 Months or Longer, Fair Value	11,928	11,861
12 Months or Longer, Unrealized Loss	(2,579)	(2,852)
Total, Fair Value	11,928	11,861
Total, Unrealized Loss	(2,579)	(2,852)
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	261,821	670,582
Less Than 12 Months, Unrealized Loss	(5,170)	(28,187)
12 Months or Longer, Fair Value	361,491	0
12 Months or Longer, Unrealized Loss	(16,215)	0
Total, Fair Value	623,312	670,582
Total, Unrealized Loss	$ (21,385)	$ (28,187)

Investment Securities - Summa_2

Investment Securities - Summary of Unrealized and Realized Gains/(Losses) Recognized in Net Income on Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Net gains/(losses) recognized during the period	$ 1,245	$ (3,640)
Less: Realized net gains/(losses) recognized on securities sold	596	(202)
Unrealized net gains/(losses) recognized on securities still held	$ 1,841	$ (3,842)

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Loans Held for Investment by Portfolio Segment (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 20,142,465,000	$ 19,350,920,000
Unearned income (net of direct origination costs)	(67,398,000)	(63,580,000)
Total loans held for investment	20,075,067,000	19,287,340,000
Allowance for credit losses on loans	(260,928,000)	(253,469,000)	$ (211,151,000)	$ (211,866,000)
Loans held for investment, net	19,814,139,000	19,033,871,000
Loans held for sale	27,608,000	36,357,000
Interest receivable	100,000,000	100,400,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,514,781,000	8,902,948,000
Allowance for credit losses on loans	(149,400,000)	(136,841,000)	(107,746,000)	(102,202,000)
Loans held for sale	27,608,000	36,357,000
Energy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,294,671,000	1,159,296,000
Allowance for credit losses on loans	(50,936,000)	(49,000,000)	(28,801,000)	(52,568,000)
Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,060,570,000	4,090,033,000
Allowance for credit losses on loans	(7,400,000)	(10,745,000)	(10,242,000)	(6,083,000)
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,272,443,000	5,198,643,000
Allowance for credit losses on loans	$ (53,192,000)	$ (56,883,000)	$ (64,362,000)	$ (51,013,000)

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Loans by Investment Grade (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 1,025,381		$ 3,524,436
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,711,422		2,318,862
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2,260,417		1,217,215
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,145,857		1,143,913
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,022,041		1,134,112
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	4,188,492		3,450,576
Revolving lines of credit	6,725,534		6,495,256
Revolving lines of credit converted to term loans	63,321		66,550
Total	20,142,465		19,350,920
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	90
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	19,828
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	262
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	552
Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	20,732	$ 460
Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	668,360		1,931,716
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,021,075		750,858
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	655,539		249,461
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	197,431		325,329
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	282,723		358,358
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	484,821		258,173
Revolving lines of credit	5,181,377		5,005,740
Revolving lines of credit converted to term loans	23,455		23,313
Total	9,514,781		8,902,948
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	20,732	110
Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	668,265		1,903,529
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,913,280		671,459
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	594,666		244,568
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	192,154		255,444
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	186,922		325,201
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	440,995		244,373
Revolving lines of credit	5,079,665		4,877,753
Revolving lines of credit converted to term loans	19,786		21,063
Total	9,095,733		8,543,390
Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	95		9,141
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	47,169		7,740
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	18,690		3,628
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,399		37,794
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	61,187		11,998
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	12,025		4,975
Revolving lines of credit	67,354		95,310
Revolving lines of credit converted to term loans	1,860		2,250
Total	209,779		172,836
Commercial | Substandard - accruing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		18,670
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,298		71,147
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	39,079		514
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,649		1,666
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	3,295		14,933
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	24,755		6,305
Revolving lines of credit	34,358		30,070
Revolving lines of credit converted to term loans	895		0
Total	122,329		143,305
Commercial | Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		376
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	42,328		512
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3,104		751
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2,229		30,425
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	31,319		6,226
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,046		2,520
Revolving lines of credit	0		2,607
Revolving lines of credit converted to term loans	914		0
Total	86,940		43,417
Energy
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	55,167		124,691
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	114,845		12,517
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		3,317
Revolving lines of credit	1,121,182		1,018,771
Revolving lines of credit converted to term loans	3,477		0
Total	1,294,671		1,159,296
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0
Energy | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	55,167		124,691
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	114,845		12,517
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		3,317
Revolving lines of credit	1,114,145		1,007,776
Revolving lines of credit converted to term loans	0		0
Total	1,284,157		1,148,301
Energy | Special mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	0		0
Energy | Substandard - accruing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	7,037		7,337
Revolving lines of credit converted to term loans	0		0
Total	7,037		7,337
Energy | Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		3,658
Revolving lines of credit converted to term loans	3,477		0
Total	3,477		3,658
Mortgage Finance
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	110,532		30,485
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	29,682		482,477
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	486,327		197,045
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	261,183		267,758
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	288,589		464,753
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,884,257		2,647,515
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	4,060,570		4,090,033
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0
Mortgage Finance | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	110,532		30,485
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	29,682		482,477
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	486,327		197,045
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	261,183		267,758
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	288,589		464,753
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,884,257		2,647,515
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	4,060,570		4,090,033
Mortgage Finance | Special mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	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, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	0		0
Mortgage Finance | Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	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, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	191,322		1,437,544
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,545,820		1,073,010
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,118,551		770,709
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	687,243		550,826
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	450,729		311,001
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	819,414		541,571
Revolving lines of credit	422,975		470,745
Revolving lines of credit converted to term loans	36,389		43,237
Total	5,272,443		5,198,643
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	$ 350
Real Estate | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total	3,695,282
Real Estate | Residential Homebuilder Finance
Financing Receivable, Recorded Investment [Line Items]
Total	465,181
Real Estate | Other Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total	790,220
Real Estate | Secured By Family
Financing Receivable, Recorded Investment [Line Items]
Total	321,760
Real Estate | Pass | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	156,825		1,085,254
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,199,143		756,180
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	807,286		563,341
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	492,723		447,346
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	369,393		183,634
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	450,333		284,698
Revolving lines of credit	97,541		97,337
Revolving lines of credit converted to term loans	10,924		11,944
Total	3,584,168		3,429,734
Real Estate | Pass | Residential Homebuilder Finance
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	17,975		94,066
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	88,017		70,951
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	52,541		12,161
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	10,180		6,106
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,636		2,655
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	4,966		0
Revolving lines of credit	281,514		326,164
Revolving lines of credit converted to term loans	0		0
Total	456,829		512,103
Real Estate | Pass | Other Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	8,741		182,840
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	182,857		131,538
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	145,691		94,611
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	92,562		67,518
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	61,954		76,951
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	222,495		163,838
Revolving lines of credit	39,401		42,333
Revolving lines of credit converted to term loans	25,465		31,293
Total	779,166		790,922
Real Estate | Pass | Secured By Family
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	7,781		64,050
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	64,081		89,967
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	89,336		53,003
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	52,460		24,314
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	17,746		16,953
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	84,837		70,082
Revolving lines of credit	4,519		4,911
Revolving lines of credit converted to term loans	0		0
Total	320,760		323,280
Real Estate | Special mention | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		2,765
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,650		6,524
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	5,847		37,791
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	29,802		5,295
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		19,350
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	24,926		3,652
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	63,225		75,377
Real Estate | Special mention | Residential Homebuilder Finance
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,352		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	8,352		0
Real Estate | Special mention | Other Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		729
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	720		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		8,721
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	6,161		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	376		386
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	7,257		9,836
Real Estate | Special mention | Secured By Family
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,000		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	1,000		0
Real Estate | Substandard - accruing | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		17,850
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	17,850		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		11,458
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	29,860		17,698
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	47,710		47,006
Real Estate | Substandard - accruing | Residential Homebuilder Finance
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		7,840
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	0		7,840
Real Estate | Substandard - accruing | Other Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		247
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	442		1,035
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	442		1,282
Real Estate | Substandard - accruing | Secured By Family
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	0		0
Real Estate | Non-accrual | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	179		182
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	179		182
Real Estate | Non-accrual | Residential Homebuilder Finance
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	0		0
Real Estate | Non-accrual | Other Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		1,081
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	3,355		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	3,355		1,081
Real Estate | Non-accrual | Secured By Family
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	$ 0		$ 0

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans - Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 253,469	$ 211,866
Provision for credit losses on loans	27,369	(1,227)
Charge-offs	20,732	460
Recoveries	822	972
Net charge-offs (recoveries)	19,910	(512)
Ending balance	260,928	211,151
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	136,841	102,202
Provision for credit losses on loans	32,475	5,437
Charge-offs	20,732	110
Recoveries	816	217
Net charge-offs (recoveries)	19,916	(107)
Ending balance	149,400	107,746
Energy
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	49,000	52,568
Provision for credit losses on loans	1,930	(24,522)
Charge-offs	0	0
Recoveries	6	755
Net charge-offs (recoveries)	(6)	(755)
Ending balance	50,936	28,801
Mortgage Finance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,745	6,083
Provision for credit losses on loans	(3,345)	4,159
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	7,400	10,242
Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	56,883	51,013
Provision for credit losses on loans	(3,691)	13,699
Charge-offs	0	350
Recoveries	0	0
Net charge-offs (recoveries)	0	350
Ending balance	$ 53,192	$ 64,362

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 28,000	$ (2,000)
Net charge-offs (recoveries)	19,910	(512)
Loan balance	20,142,465		$ 19,350,920
Nonaccrual loans that met the criteria for restructured		18,000	531
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs (recoveries)	19,916	(107)
Loan balance	9,514,781		8,902,948
Commercial | Asset Pledged as Collateral
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan balance	38,700
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs (recoveries)	0	350
Loan balance	5,272,443		5,198,643
Real Estate | Asset Pledged as Collateral
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan balance	1,100
Criticized
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan balance	561,100	476,100	$ 513,200
Leveraged Lending
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs (recoveries)		(512)
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 27,400	$ (1,200)

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses on Loans - Age Analysis (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 20,142,465,000		$ 19,350,920,000
Non-accrual	93,951,000
Non-accrual With No Allowance	78,831,000
Non-accrual loans earning interest income on cash basis	2,100,000		2,200,000
Interest income on non-accrual loans	0
Interest Income Reversed	1,500,000	$ 4,000
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	9,514,781,000		8,902,948,000
Non-accrual	86,940,000
Non-accrual With No Allowance	71,999,000
Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,294,671,000		1,159,296,000
Non-accrual	3,477,000
Non-accrual With No Allowance	3,477,000
Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4,060,570,000		4,090,033,000
Non-accrual	0
Non-accrual With No Allowance	0
Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,272,443,000		$ 5,198,643,000
Real Estate | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,695,282,000
Non-accrual	179,000
Non-accrual With No Allowance	0
Real Estate | Residential Homebuilder Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	465,181,000
Non-accrual	0
Non-accrual With No Allowance	0
Real Estate | Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	790,220,000
Non-accrual	3,355,000
Non-accrual With No Allowance	3,355,000
Real Estate | Secured By Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	321,760,000
Non-accrual	0
Non-accrual With No Allowance	0
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	6,003,000
30-59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,185,000
30-59 Days Past Due | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-59 Days Past Due | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-59 Days Past Due | Real Estate | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-59 Days Past Due | Real Estate | Residential Homebuilder Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-59 Days Past Due | Real Estate | Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	430,000
30-59 Days Past Due | Real Estate | Secured By Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,388,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	242,000
60-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	242,000
60-89 Days Past Due | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
60-89 Days Past Due | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
60-89 Days Past Due | Real Estate | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
60-89 Days Past Due | Real Estate | Residential Homebuilder Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
60-89 Days Past Due | Real Estate | Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
60-89 Days Past Due | Real Estate | Secured By Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,098,000
90 Days or More Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,098,000
90 Days or More Past Due | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due | Real Estate | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due | Real Estate | Residential Homebuilder Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due | Real Estate | Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due | Real Estate | Secured By Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	9,343,000
Total Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	6,525,000
Total Past Due | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Total Past Due | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Total Past Due | Real Estate | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Total Past Due | Real Estate | Residential Homebuilder Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Total Past Due | Real Estate | Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	430,000
Total Past Due | Real Estate | Secured By Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,388,000
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	20,039,171,000
Current | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	9,421,316,000
Current | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,291,194,000
Current | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4,060,570,000
Current | Real Estate | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,695,103,000
Current | Real Estate | Residential Homebuilder Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	465,181,000
Current | Real Estate | Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	786,435,000
Current | Real Estate | Secured By Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 319,372,000

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses on Loans - Summary of Amortized Cost of Gross Modified Loans Held for Investment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 51,641
Percentage of Total Loans Held for Investment	0.26%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 31,431
Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	1,800
Payment Deferral and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	3,477
Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	14,933
Commercial
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 48,164
Percentage of Total Loans Held for Investment	0.24%
Commercial | Payment Deferral
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 31,431
Commercial | Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	1,800
Commercial | Payment Deferral and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	0
Commercial | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	14,933
Energy
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 3,477
Percentage of Total Loans Held for Investment	0.02%
Energy | Payment Deferral
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 0
Energy | Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	0
Energy | Payment Deferral and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	3,477
Energy | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 0

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses on Loans - Summary of Financial Impacts of Loan Modifications (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Commercial
Financing Receivable, Modifications [Line Items]
Interest Rate Reduction	0.70%
Total Payment Deferrals (in thousands)	$ 3,523
Commercial | Minimum
Financing Receivable, Modifications [Line Items]
Term Extension (in months)	6 months
Commercial | Maximum
Financing Receivable, Modifications [Line Items]
Term Extension (in months)	18 months
Energy
Financing Receivable, Modifications [Line Items]
Interest Rate Reduction	0%
Term Extension (in months)	36 months
Total Payment Deferrals (in thousands)	$ 1,200

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses on Loans - Schedule of Age Analysis of Gross Modified Loans Held for Investment (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Total	$ 51,641
30-89 Days Past Due
Financing Receivable, Modifications [Line Items]
Total	161
90+ Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
Non-Accrual
Financing Receivable, Modifications [Line Items]
Total	4,401
Current
Financing Receivable, Modifications [Line Items]
Total	47,079
Commercial
Financing Receivable, Modifications [Line Items]
Total	48,164
Commercial | 30-89 Days Past Due
Financing Receivable, Modifications [Line Items]
Total	161
Commercial | 90+ Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
Commercial | Non-Accrual
Financing Receivable, Modifications [Line Items]
Total	924
Commercial | Current
Financing Receivable, Modifications [Line Items]
Total	47,079
Energy
Financing Receivable, Modifications [Line Items]
Total	3,477
Energy | 30-89 Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
Energy | 90+ Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
Energy | Non-Accrual
Financing Receivable, Modifications [Line Items]
Total	3,477
Energy | Current
Financing Receivable, Modifications [Line Items]
Total	$ 0

Short-Term Borrowings and Lon_3

Short-Term Borrowings and Long-Term Debt - Summary of Short-Term Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Amount outstanding at year-end	$ 2,100,000	$ 1,201,142
Customer repurchase agreements
Debt Instrument [Line Items]
Amount outstanding at year-end	0	1,142
Federal Home Loan Bank borrowings
Debt Instrument [Line Items]
Amount outstanding at year-end	$ 2,100,000	$ 1,200,000

Short-Term Borrowings and Lon_4

Short-Term Borrowings and Long-Term Debt - Summary of Long-Term Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	May 06, 2021	Jan. 31, 2014
Schedule Of Borrowings [Line Items]
Long-term debt	$ 932,119	$ 931,442
Senior Unsecured Credit-Linked Notes, Due 2024
Schedule Of Borrowings [Line Items]
Senior unsecured credit-linked notes	272,994	272,492
5.75% Subordinated Notes, Due 2026
Schedule Of Borrowings [Line Items]
Trust preferred securities issued	174,262	174,196
Interest rate				5.25%
4.00% Subordinated Notes, Due 2031
Schedule Of Borrowings [Line Items]
Trust preferred securities issued	371,457	371,348
Interest rate			4%
Floating Rate Subordinated Debentures, Due 2032 to 2036
Schedule Of Borrowings [Line Items]
Trust preferred securities issued	$ 113,406	$ 113,406

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Beginning balance of allowance for off-balance sheet credit losses	$ 21,793	$ 17,265
Provision for off-balance sheet credit losses	631	(773)
Ending balance of allowance for off-balance sheet credit losses	22,424	$ 16,492
Commitments to extend credit
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Off-balance sheet liability	10,231,682		$ 9,673,082
Standby letters of credit
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Off-balance sheet liability	$ 436,057		$ 417,896

Regulatory Ratios and Capital -

Regulatory Ratios and Capital - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Jan. 18, 2023 USD ($)	Dec. 31, 2022 USD ($)	Apr. 19, 2022 USD ($)	Dec. 31, 2009 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Shares repurchased	$ 60,218
Assets	$ 28,596,653		$ 28,414,642		$ 15,000,000
Required reserve balance at the Federal Reserve			$ 0
April 2022 Share Repurchase Program
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Authorized repurchase amount				$ 150,000
January 2023 Share Repurchase Program
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Authorized repurchase amount		$ 150,000
Shares repurchased (in shares) | shares	1,011,909
Shares repurchased	$ 59,700
Shares repurchased, price per share (in dollars per share) | $ / shares	$ 58.98
Basel III, Phased-In
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, ratio	0.025

Regulatory Ratios and Capital_2

Regulatory Ratios and Capital - Schedule of Compliance With Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 3,157,937	$ 3,180,208
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	4,285,396	4,331,098
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,542,507	2,446,583
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	3,567,937	3,590,208
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	1,525,504	1,467,950
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	$ 3,567,937	$ 3,590,208
Risk Based Ratios [Abstract]
CET1, actual ratio	12.42%	13%
Total capital (to risk weighted assets), actual ratio	0.1686	0.1770
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	0.1403	0.1467
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	0.1203	0.1154
Bank
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 3,454,486	$ 3,408,178
CET1 to be well capitalized under prompt corrective action provisions, amount	1,649,845	1,587,909
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	4,010,488	3,987,720
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,538,224	2,442,937
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	3,614,486	3,568,178
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,030,579	1,954,349
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	3,614,486	3,568,178
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, amount	$ 1,481,686	$ 1,554,039
Risk Based Ratios [Abstract]
CET1, actual ratio	13.61%	13.95%
CET1 to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Total capital (to risk weighted assets), actual ratio	0.1580	0.1632
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	0.1424	0.1461
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	0.1220	0.1148
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, ratio	0.0500	0.0500
Basel III, Phase-In Schedule
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount	$ 1,779,755	$ 1,712,608
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,669,633	2,568,912
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,161,131	2,079,595
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,186,723	$ 1,244,494
Risk Based Ratios [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
Basel III, Phase-In Schedule | Bank
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount	$ 1,776,757	$ 1,710,056
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,665,135	2,565,083
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,157,490	2,076,496
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,185,349	$ 1,243,232
Risk Based Ratios [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
	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled awards:	$ 8,438	$ 5,588
Unrecognized compensation expense related to unvested stock-settled awards	$ 46,870
Weighted average period over which expense is expected to be recognized, in years	2 years 6 months
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled awards:	$ 8,438	5,407
Cash-settled units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled awards:	$ 0	$ 181

Fair Value Disclosures - Schedu

Fair Value Disclosures - Schedule of Assets and Liabilities Measured At Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 3,394,293	$ 2,615,644
Equity securities	32,714	33,956
Derivative assets	19,401	13,504
Derivative liabilities	70,220	91,758
US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	623,312	670,582
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	104,117	102,154
CRT securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	11,928	11,861
Fair value measurements, recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	21,548	22,879
Derivative assets	0	0
Derivative liabilities	0	0
Non-qualified deferred compensation plan liabilities	19,778	21,177
Fair value measurements, recurring basis | Level 1 | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	623,312	670,582
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 | 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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	11,166	11,077
Derivative assets	19,401	13,504
Derivative liabilities	70,220	91,758
Non-qualified deferred compensation plan liabilities	0	0
Fair value measurements, recurring basis | Level 2 | US Treasury 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 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	104,117	102,154
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	2,654,936	1,831,047
Fair value measurements, recurring basis | Level 2 | 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 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Non-qualified deferred compensation plan liabilities	0	0
Fair value measurements, recurring basis | Level 3 | US Treasury 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 | 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 | CRT securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	11,928	$ 11,861
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	$ 35,458

Fair Value Disclosures - Level

Fair Value Disclosures - Level 3 Fair Value Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		$ 7,658
Purchases / Additions		1,327
Sales / Reductions		(571)
Realized		0
Unrealized		(329)
Balance at End of Period		$ 8,085
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Tax-exempt asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		$ 180,033
Purchases / Additions		0
Sales / Reductions		(3,736)
Realized		0
Unrealized		(10,452)
Balance at End of Period		$ 165,845
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Accumulated other comprehensive loss, net of taxes	Accumulated other comprehensive loss, net of taxes
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
CRT securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	$ 11,861	$ 11,846
Purchases / Additions	0	0
Sales / Reductions	0	0
Realized	0	0
Unrealized	67	55
Balance at End of Period	$ 11,928	$ 11,901
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Accumulated other comprehensive loss, net of taxes	Accumulated other comprehensive loss, net of taxes
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other

Fair Value Disclosures - Narrat

Fair Value Disclosures - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Loans held for investment, net	$ 35,458
Impaired loans, carrying value	39,800
Allowance allocations	$ 4,300
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Loans held for sale, fair value		$ 0
CRT securities | Minimum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, term	4 years 10 months 2 days
CRT securities | Maximum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, term	8 years 5 months 1 day
Measurement Input, Discount Rate | CRT securities | Minimum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, measurement input	0.0543
Measurement Input, Discount Rate | CRT securities | Maximum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, measurement input	0.1137
Measurement Input, Discount Rate | CRT securities | Weighted Average
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, measurement input	0.0744	0.0824
Debt securities, available-for-sale, term	6 years 18 days	6 years 3 months 3 days

Fair Value Disclosures - Summar

Fair Value Disclosures - Summary of the Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	$ 3,394,293	$ 2,615,644
Held-to-maturity debt securities	918,962	935,514
Equity securities	32,714	33,956
Derivative assets	19,401	13,504
Long-term debt	932,119	931,442
Derivative liabilities	70,220	91,758
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,649,705	5,012,260
Available-for-sale debt securities	3,394,293	2,615,644
Held-to-maturity debt securities	918,962	935,514
Equity securities	32,714	33,956
Loans held for sale	27,608	36,357
Loans held for investment, net	19,814,139	19,033,871
Derivative assets	19,401	13,504
Total deposits	22,179,697	22,856,880
Short-term borrowings	2,100,000	1,201,142
Long-term debt	932,119	931,442
Derivative liabilities	70,220	91,758
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,649,705	5,012,260
Available-for-sale debt securities	3,394,293	2,615,644
Held-to-maturity debt securities	811,531	816,914
Equity securities	32,714	33,956
Loans held for sale	27,208	36,357
Loans held for investment, net	19,755,693	18,969,922
Derivative assets	19,401	13,504
Total deposits	22,184,982	22,857,949
Short-term borrowings	2,100,000	1,201,142
Long-term debt	866,529	881,716
Derivative liabilities	70,220	91,758
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,649,705	5,012,260
Available-for-sale debt securities	623,312	670,582
Equity securities	21,548	22,879
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	2,759,053	1,933,201
Held-to-maturity debt securities	811,531	816,914
Equity securities	11,166	11,077
Loans held for sale	27,208	0
Derivative assets	19,401	13,504
Short-term borrowings	2,100,000	1,201,142
Long-term debt	866,529	881,716
Derivative liabilities	70,220	91,758
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	11,928	11,861
Loans held for sale	0	36,357
Loans held for investment, net	19,755,693	18,969,922
Total deposits	$ 22,184,982	$ 22,857,949

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Estimated fair value, asset derivative	$ 87,545	$ 90,543
Estimated fair value, liability derivative	150,376	176,543
Offsetting derivative liabilities	(14,038)	(5,164)
Offsetting derivative assets	(14,038)	(5,164)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	(54,106)	(71,875)
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	(66,118)	(79,621)
Net asset derivatives included in the consolidated balance sheets	19,401	13,504
Net liability derivatives included in the consolidated balance sheets	$ 70,220	$ 91,758
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Derivatives designated as hedges | Swaps | Cash Flow Hedging
Derivative [Line Items]
Residential MSRs, notional amount	$ 3,100,000	$ 3,000,000
Estimated fair value, asset derivative	1,658	0
Estimated fair value, liability derivative	65,090	86,378
Non-hedging derivatives | Swaps | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	4,527,001	4,396,367
Estimated fair value, asset derivative	70,881	83,529
Estimated fair value, liability derivative	70,881	83,529
Non-hedging derivatives | Foreign currency forward contracts | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	2,682	0
Estimated fair value, asset derivative	13	0
Estimated fair value, liability derivative	0	0
Non-hedging derivatives | Caps and floors written | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	168,065	220,142
Estimated fair value, asset derivative	0	0
Estimated fair value, liability derivative	2,238	2,583
Non-hedging derivatives | Caps and floors purchased | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	168,065	220,142
Estimated fair value, asset derivative	2,238	2,583
Estimated fair value, liability derivative	0	0
Non-hedging derivatives | Forward contracts | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	4,486,001	1,569,326
Estimated fair value, asset derivative	12,755	4,431
Estimated fair value, liability derivative	$ 12,167	$ 4,053

Derivative Financial Instrume_4

Derivative Financial Instruments Derivative Financial Instruments - Narrative (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) instrument	Dec. 31, 2022 USD ($) instrument
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 135,600,000	$ 89,200,000
CashCollateralPostedForDerivativesInLiabilityPosition	$ 57,000,000	$ 72,500,000
Risk participation agreement - participant bank
Derivative [Line Items]
Instruments held | instrument	18	19
Non-hedging derivatives, notional amoount	$ 336,900,000	$ 291,200,000
Maximum exposure	$ 6,600,000	$ 8,900,000
Risk participation agreement - lead bank
Derivative [Line Items]
Instruments held | instrument	9	18
Non-hedging derivatives, notional amoount	$ 124,700,000	$ 222,000,000
Interest rate contract
Derivative [Line Items]
Unrealized losses, net of tax to AOCI	(13,500,000)
Amount reclassified from AOCI into interest income on loans	11,100,000
Amount reclassified from AOCI as a decrease to interest income	$ 50,300,000
Maximum period to hedge forecasted transactions	3 years 6 months
Loans Receivable | Not Designated as Hedging Instrument
Derivative [Line Items]
Credit risk exposure, net of collateral pledged, relating to derivatives	$ 19,400,000	$ 13,500,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 3,055,351	$ 3,209,616
Change in unrealized gain/(loss)	42,953	(200,619)
Amounts reclassified into net income	12,973	986
Other comprehensive income/(loss)	55,926	(199,633)
Income tax expense/(benefit)	11,745	(41,923)
Other comprehensive income/(loss), net of tax	44,181	(157,710)
Ending balance	3,079,974	3,090,038
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(66,394)	0
Change in unrealized gain/(loss)	13,528	0
Amounts reclassified into net income	11,129	0
Other comprehensive income/(loss)	24,657	0
Income tax expense/(benefit)	5,179	0
Other comprehensive income/(loss), net of tax	19,478	0
Ending balance	(46,916)	0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(304,309)	(47,715)
Change in unrealized gain/(loss)	29,425	(131,454)
Amounts reclassified into net income	0	0
Other comprehensive income/(loss)	29,425	(131,454)
Income tax expense/(benefit)	6,179	(27,605)
Other comprehensive income/(loss), net of tax	23,246	(103,849)
Ending balance	(281,063)	(151,564)
AOCI, Accumulated Gain (Loss), Debt Securities, Held-to-Maturity, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(48,240)	0
Change in unrealized gain/(loss)	0	(69,165)
Amounts reclassified into net income	1,844	986
Other comprehensive income/(loss)	1,844	(68,179)
Income tax expense/(benefit)	387	(14,318)
Other comprehensive income/(loss), net of tax	1,457	(53,861)
Ending balance	(46,783)	(53,861)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(418,943)	(47,715)
Ending balance	$ (374,762)	$ (205,425)