Texas Capital Bancshares (TCBI) 10-Q 20 Jul 23 2023 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2023	Jul. 19, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 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		48,000,808
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	Q2
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	Jun. 30, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 260,314	$ 233,637
Interest bearing cash and cash equivalents	2,587,131	4,778,623
Available-for-sale debt securities	3,292,478	2,615,644
Held-to-maturity debt securities	900,315	935,514
Equity securities	33,860	33,956
Investment securities	4,226,653	3,585,114
Loans held for sale	29,097	36,357
Loans held for investment, mortgage finance	5,098,812	4,090,033
Loans held for investment	16,227,203	15,197,307
Less: Allowance for credit losses on loans	(237,343)	(253,469)
Loans held for investment, net	21,088,672	19,033,871
Premises and equipment, net	26,096	26,382
Accrued interest receivable and other assets	757,085	719,162
Goodwill and intangibles, net	1,496	1,496
Total assets	28,976,544	28,414,642
Deposits [Abstract]
Non-interest bearing deposits	9,429,352	9,618,081
Interest bearing deposits	13,888,888	13,238,799
Total deposits	23,318,240	22,856,880
Accrued interest payable	29,658	24,000
Other liabilities	338,924	345,827
Short-term borrowings	1,350,000	1,201,142
Long-term debt	857,795	931,442
Total liabilities	25,894,617	25,359,291
Stockholders’ equity:
Preferred stock	300,000	300,000
Common stock	511	509
Additional paid-in capital	1,035,063	1,025,593
Retained earnings	2,362,189	2,263,502
Treasury stock - 3,095,444 and 2,083,535 shares at cost at June 30, 2023 and December 31, 2022, respectively	(175,528)	(115,310)
Accumulated other comprehensive loss, net of taxes	(440,308)	(418,943)
Total stockholders’ equity	3,081,927	3,055,351
Total liabilities and stockholders’ equity	$ 28,976,544	$ 28,414,642

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 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	51,087,965	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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income
Interest and fees on loans	$ 332,867	$ 218,292	$ 630,305	$ 405,948
Investment securities	27,478	14,665	52,770	31,967
Interest bearing cash and cash equivalents	41,571	9,394	104,007	12,965
Total interest income	401,916	242,351	787,082	450,880
Interest expense
Deposits	137,391	20,566	257,485	34,196
Short-term borrowings	18,253	4,859	32,997	5,617
Long-term debt	14,282	11,393	29,265	21,988
Total interest expense	169,926	36,818	319,747	61,801
Net interest income	231,990	205,533	467,335	389,079
Provision for credit losses	7,000	22,000	35,000	20,000
Net interest income after provision for credit losses	224,990	183,533	432,335	369,079
Non-interest income
Service charges on deposit accounts	5,158	6,102	10,180	12,217
Wealth management and trust fee income	3,715	4,051	7,144	7,963
Brokered loan fees	2,415	4,133	4,310	8,103
Investment banking and trading income	27,498	11,126	46,266	15,305
Other	7,225	828	15,514	2,935
Total non-interest income	46,011	26,240	83,414	46,523
Non-interest expense
Salaries and benefits	113,050	103,358	241,720	203,217
Occupancy expense	9,482	8,874	19,101	17,759
Marketing	6,367	8,506	15,411	13,483
Legal and professional	15,669	11,288	30,183	21,590
Communications and technology	20,525	15,649	38,048	30,349
Federal Deposit Insurance Corporation insurance assessment	3,693	3,318	5,863	7,299
Other	12,858	13,310	25,345	23,698
Total non-interest expense	181,644	164,303	375,671	317,395
Income before income taxes	89,357	45,470	140,078	98,207
Income tax expense	20,706	11,311	32,766	24,398
Net income	68,651	34,159	107,312	73,809
Preferred stock dividends	(4,312)	(4,312)	(8,625)	(8,625)
Net income available to common stockholders	64,339	29,847	98,687	65,184
Other comprehensive income/(loss):
Change in unrealized gain/(loss)	(99,731)	(86,438)	(56,778)	(287,057)
Amounts reclassified into net income	16,762	1,903	29,735	2,889
Other comprehensive income/(loss)	(82,969)	(84,535)	(27,043)	(284,168)
Income tax expense/(benefit)	(17,423)	(17,752)	(5,678)	(59,675)
Other comprehensive income/(loss), net of tax	(65,546)	(66,783)	(21,365)	(224,493)
Comprehensive income/(loss)	$ 3,105	$ (32,624)	$ 85,947	$ (150,684)
Basic earnings per common share
Basic earnings per common share	$ 1.34	$ 0.59	$ 2.05	$ 1.29
Diluted earnings per common share
Diluted earnings per common share	$ 1.33	$ 0.59	$ 2.02	$ 1.28

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	73,809				73,809
Change in other comprehensive income/(loss), net of taxes	(224,493)						(224,493)
Total comprehensive loss	(150,684)
Stock-based compensation expense recognized in earnings	10,429			10,429
Preferred stock dividend	(8,625)				(8,625)
Issuance of stock related to stock-based awards (in shares)			201,426
Issuance of stock related to stock-based awards	(3,881)		$ 2	(3,883)
Repurchase of common stock (shares)						(941,879)
Repurchase of common stock	(50,023)					$ (50,023)
Ending balance, preferred stock (in shares) at Jun. 30, 2022		300,000
Ending balance, common stock (in shares) at Jun. 30, 2022			50,820,337
Ending balance, treasury stock (in shares) at Jun. 30, 2022						942,296
Ending balance at Jun. 30, 2022	3,006,832	$ 300,000	$ 508	1,015,105	2,013,458	$ (50,031)	(272,208)
Beginning balance, preferred stock (in shares) at Mar. 31, 2022		300,000
Beginning balance, common stock (in shares) at Mar. 31, 2022			50,710,858
Beginning balance, treasury stock (in shares) at Mar. 31, 2022						417
Beginning balance at Mar. 31, 2022	3,090,038	$ 300,000	$ 507	1,011,353	1,983,611	$ (8)	(205,425)
Comprehensive income/(loss):
Net income	34,159				34,159
Change in other comprehensive income/(loss), net of taxes	(66,783)						(66,783)
Total comprehensive loss	(32,624)
Stock-based compensation expense recognized in earnings	5,022			5,022
Preferred stock dividend	(4,312)				(4,312)
Issuance of stock related to stock-based awards (in shares)			109,479
Issuance of stock related to stock-based awards	(1,269)		$ 1	(1,270)
Repurchase of common stock (shares)						(941,879)
Repurchase of common stock	(50,023)					$ (50,023)
Ending balance, preferred stock (in shares) at Jun. 30, 2022		300,000
Ending balance, common stock (in shares) at Jun. 30, 2022			50,820,337
Ending balance, treasury stock (in shares) at Jun. 30, 2022						942,296
Ending balance at Jun. 30, 2022	$ 3,006,832	$ 300,000	$ 508	1,015,105	2,013,458	$ (50,031)	(272,208)
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	107,312				107,312
Change in other comprehensive income/(loss), net of taxes	(21,365)						(21,365)
Total comprehensive loss	85,947
Stock-based compensation expense recognized in earnings	13,507			13,507
Preferred stock dividend	(8,625)				(8,625)
Issuance of stock related to stock-based awards (in shares)			220,667
Issuance of stock related to stock-based awards	(4,035)		$ 2	(4,037)
Repurchase of common stock (shares)						(1,011,909)
Repurchase of common stock	$ (60,218)					$ (60,218)
Ending balance, preferred stock (in shares) at Jun. 30, 2023		300,000
Ending balance, common stock (in shares) at Jun. 30, 2023			51,087,965
Ending balance, treasury stock (in shares) at Jun. 30, 2023	3,095,444					3,095,444
Ending balance at Jun. 30, 2023	$ 3,081,927	$ 300,000	$ 511	1,035,063	2,362,189	$ (175,528)	(440,308)
Beginning balance, preferred stock (in shares) at Mar. 31, 2023		300,000
Beginning balance, common stock (in shares) at Mar. 31, 2023			50,947,306
Beginning balance, treasury stock (in shares) at Mar. 31, 2023						3,095,444
Beginning balance at Mar. 31, 2023	3,079,974	$ 300,000	$ 509	1,031,905	2,297,850	$ (175,528)	(374,762)
Comprehensive income/(loss):
Net income	68,651				68,651
Change in other comprehensive income/(loss), net of taxes	(65,546)						(65,546)
Total comprehensive loss	3,105
Stock-based compensation expense recognized in earnings	5,069			5,069
Preferred stock dividend	(4,312)				(4,312)
Issuance of stock related to stock-based awards (in shares)			140,659
Issuance of stock related to stock-based awards	$ (1,909)		$ 2	(1,911)
Ending balance, preferred stock (in shares) at Jun. 30, 2023		300,000
Ending balance, common stock (in shares) at Jun. 30, 2023			51,087,965
Ending balance, treasury stock (in shares) at Jun. 30, 2023	3,095,444					3,095,444
Ending balance at Jun. 30, 2023	$ 3,081,927	$ 300,000	$ 511	$ 1,035,063	$ 2,362,189	$ (175,528)	$ (440,308)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net income	$ 107,312	$ 73,809
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Provision for credit losses	35,000	20,000
Depreciation and amortization	19,717	24,081
Net gain recognized on investment securities	(2,685)	0
Stock-based compensation expense	13,507	10,612
Purchases and originations of loans held for sale	0	(1,072)
Proceeds from sales and repayments of loans held for sale	7,260	4,600
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(42,383)	(10,753)
Accrued interest payable and other liabilities	(47,067)	25,259
Net cash provided by operating activities	90,661	146,536
Investing activities
Purchases of available-for-sale securities	(849,391)	(637,803)
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	106,988	333,811
Proceeds from maturities, redemptions and pay-downs of held-to-maturity debt securities	37,075	40,224
Sales/(purchases) of equity securities, net	2,292	855
Originations of loans held for investment, mortgage finance	(35,597,043)	(54,492,183)
Proceeds from pay-offs of loans held for investment, mortgage finance	34,588,264	55,418,173
Net increase in loans held for investment, excluding mortgage finance loans	(1,058,046)	(2,188,546)
Purchase of premises and equipment, net	(4,878)	(9,201)
Net cash used in investing activities	(2,717,816)	(1,534,670)
Financing activities
Net increase/(decrease) in deposits	461,360	(2,669,344)
Issuance of stock related to stock-based awards	(4,035)	(3,881)
Preferred dividends paid	(8,625)	(8,625)
Repurchase of common stock	(60,218)	(50,023)
Net increase (decrease) in short-term borrowings	148,858	448,704
Redemption of long-term debt	(75,000)	0
Net cash provided by/(used in) financing activities	462,340	(2,283,169)
Net decrease in cash and cash equivalents	(2,164,815)	(3,671,303)
Cash and cash equivalents at beginning of period	5,012,260	7,946,659
Cash and cash equivalents at end of period	2,847,445	4,275,356
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	314,089	60,572
Cash paid during the period for income taxes	43,286	29,350
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	6 Months Ended
	Jun. 30, 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 the Company’s 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 the consolidated financial statements, and notes thereto, for the year ended December 31, 2022, included in the Company’s 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. In the second quarter of 2023, changes were made to certain estimates used in the Company’s current expected credit loss model, the most significant of which are more granular estimates of historical loss rates to incorporate probability of default and loss severities and allocations of expected losses to outstanding loan balances and off-balance sheet financial instruments. As a result of these changes, corresponding adjustments were also made to the Company’s portfolio segments to appropriately pool loans with similar risk characteristics and to the speed at which the Company reverts to historical loss rates for periods beyond which management is able to develop reasonable and supportable forecasts. The below accounting policy from the Company’s 2022 Form 10-K has been updated to incorporate these changes. Allowance for Credit Losses The Company’s allowance for credit losses is determined using a current expected credit loss (“CECL”) model. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. The following is a discussion of the allowance for credit losses on loans held for investment and off-balance sheet credit exposures. See Note 1 - Operations and Summary of Significant Accounting Policies - Investment Securities - Debt Securities in the Company’s 2022 Form 10-K for discussion of the allowance for credit losses on available-for-sale and held-to-maturity debt securities. The CECL methodology recognizes lifetime expected credit losses immediately when a financial asset is originated or purchased. The allowance for credit losses on loans is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the allowance when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. The allowance for credit losses on off-balance sheet financial instruments is recorded in other liabilities on the consolidated balance sheets, Management estimates the allowance balance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, credit quality, or term, as well as for changes in macroeconomic conditions, such as changes in unemployment rates, gross domestic product, property values, or other relevant factors. The allowance for credit losses is comprised of reserves measured on a collective (pool) basis when similar risk characteristics exist. Loans that do not share risk characteristics are assigned a reserve based on an individual evaluation and are not included in the collective (pool) evaluation. For purposes of determining the collective (pool) allowance for credit losses, the loan portfolio is segregated into pools first by portfolio segment and then by past due status or credit grade. Each pool is assigned a loss estimate, reflecting historical loss rates that incorporate probability of default and severity of losses over the estimated remaining life of the loans. These loss estimates are then modified to incorporate a reasonable and supportable forecast of future losses at the pool level, as well as any necessary qualitative adjustments using a Portfolio Level Qualitative Factor (“PLQF”) and/or a Portfolio Segment Level Qualitative Factor (“SLQF”). A similar process is employed to calculate a reserve assigned to off-balance financial instruments, specifically unfunded loan commitments and letters of credit. Modified loss estimates are assigned based on the balance of the commitments estimated to be outstanding at the time of default. The PLQF and SLQF are utilized to address factors that are not present in historical loss rates and are otherwise unaccounted for in the quantitative process. The PLQF is used to apply a qualitative adjustment across the entire portfolio of loans, while the SLQF is designed to apply a qualitative adjustment across a single portfolio segment. Even though portions of the allowance may be allocated to specific loans, the entire allowance is available for any credit that, in management’s judgment, should be charged off. The Company generally uses a two-year forecast period, based on a single forecast scenario or a blend of multiple forecast scenarios, using variables management believes are most relevant to each portfolio segment. For periods beyond which management is able to develop reasonable and supportable forecasts, the Company reverts to the average historical loss rate, reflecting historical default probabilities and loss severities, using a reversion speed that approximates 1 to 2 years. The forecast period and scenario(s) used are reviewed on a quarterly basis and may be adjusted based on management's view of the current economic conditions and level of predictability the forecast can provide. Portfolio segments are used to pool loans with similar risk characteristics and align with the Company’s methodology for measuring expected credit losses. A summary of the primary portfolio segments is as follows: Commercial. The commercial loan portfolio is comprised of lines of credit for working capital, term loans, reserve-based loans to energy exploration and production companies, and leases to finance equipment and other business assets across a variety of industries. These loans are used for general corporate purposes including financing working capital, internal growth, and acquisitions and are generally secured by accounts receivable, inventory, oil and gas reserves, equipment and other assets of clients’ businesses. Mortgage Finance. Mortgage finance loans relate to mortgage warehouse lending operations in which the Company purchases mortgage loan ownership interests from unaffiliated mortgage originators that are generally held for a period of less than 30 days and more typically 10-20 days before they are sold to an approved investor. Volumes fluctuate based on the level of market demand for the product and the number of days between purchase and sale of the loans, which can be affected by changes in overall market interest rates and housing demand and tend to peak at the end of each month. Mortgage finance loans are consistently underwritten based on standards established by the approved investors. Market conditions or events of default by an investor or originator could require that the Company repurchases the remaining interests in the mortgage loans and hold them beyond the expected 10-20 days. Commercial Real Estate (“CRE”). The CRE portfolio is comprised of construction/development financing and limited term financing provided to professional real estate developers, owners/managers of commercial real estate projects and properties, and residential builders/developers. Collateral properties include office buildings, warehouse/distribution buildings, shopping centers, hotels/motels, senior living, apartment buildings, residential and commercial tract developments, and raw land or lots to be developed into single-family homes. The primary source of repayment on these loans is expected to come from the sale, permanent financing or lease of the real property collateral. The performance of these loans is impacted by fluctuations in collateral values, the ability of the borrower to obtain permanent financing, and, in the case of loans to residential builder/developers, volatility in consumer demand. Consumer. This category of loans is comprised of loans made to consumers for personal expenditures, first and second lien mortgages made for the purpose of purchasing or constructing 1-4 family residential dwellings and home equity revolving lines of credit. The Company has several pass credit grades that are assigned to loans based on varying levels of risk, ranging from credits that are secured by cash or marketable securities, to watch credits which have all the characteristics of an acceptable credit risk but warrant more than the normal level of monitoring. Within the criticized/classified credit grades are special mention, substandard and doubtful. Special mention loans are those that are currently protected by the sound worth and paying capacity of the borrower, but that are potentially weak and constitute an additional credit risk. These loans have the potential to deteriorate to a substandard grade due to the existence of financial or administrative deficiencies. Substandard loans have a well-defined weakness or weaknesses that jeopardizes the liquidation of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Some substandard loans are inadequately protected by the sound worth and paying capacity of the borrower and of the collateral pledged and may be considered impaired. Substandard loans can be accruing or can be on non-accrual depending on the circumstances of the individual loans. Loans classified as doubtful have all the weaknesses inherent in substandard loans with the added characteristics that the weaknesses make collection in full highly questionable and improbable. The possibility of loss is extremely high. All doubtful loans are on non-accrual. The methodology used in the estimation of the allowance, which is performed at least quarterly, is designed to be dynamic and responsive to changes in portfolio credit quality and forecasted economic conditions. Changes are reflected in the pool-basis allowance and in reserves assigned on an individual basis as the collectability of classified loans is evaluated with new information. As the Company’s portfolio has matured, historical loss ratios have been closely monitored. The review of the appropriateness of the allowance is performed by executive management and presented to the audit and risk committees of the board of directors for their review. The committees report to the board as part of the board's quarterly review of the Company’s consolidated financial statements. When management determines that foreclosure is probable, and for certain collateral-dependent loans where foreclosure is not considered probable, expected credit losses are based on the estimated fair value of the collateral adjusted for selling costs, when appropriate. 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. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals and modifications unless either of the following applies: management has a reasonable expectation that a loan will be restructured or the extension or renewal options are included in the borrower contract and are not unconditionally cancellable. The Company does not measure an allowance for credit losses on accrued interest receivable balances because these balances are written off in a timely manner as a reduction to interest income when loans are placed on non-accrual status as discussed above.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 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 June 30, Six Months Ended June 30, (in thousands except share and per share data) 2023 2022 2023 2022 Numerator: Net income $ 68,651 $ 34,159 $ 107,312 $ 73,809 Preferred stock dividends 4,312 4,312 8,625 8,625 Net income available to common stockholders $ 64,339 $ 29,847 $ 98,687 $ 65,184 Denominator: Basic earnings per common share—weighted average common shares 47,906,624 50,258,681 48,166,977 50,462,735 Effect of dilutive outstanding stock-settled awards 514,652 542,947 569,405 607,034 Dilutive earnings per common share—weighted average diluted common shares 48,421,276 50,801,628 48,736,382 51,069,769 Basic earnings per common share $ 1.34 $ 0.59 $ 2.05 $ 1.29 Diluted earnings per common share $ 1.33 $ 0.59 $ 2.02 $ 1.28 Anti-dilutive outstanding stock-settled awards 533,363 430,224 341,728 301,842

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 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 June 30, 2023 Available-for-sale debt securities: U.S. Treasury securities $ 646,811 $ — $ (26,483) $ 620,328 U.S. government agency securities 125,000 — (21,314) 103,686 Residential mortgage-backed securities 2,902,892 — (346,184) 2,556,708 CRT securities 14,226 — (2,470) 11,756 Total available-for-sale debt securities 3,688,929 — (396,451) 3,292,478 Held-to-maturity debt securities: Residential mortgage-backed securities 900,315 — (111,880) 788,435 Total held-to-maturity debt securities 900,315 — (111,880) 788,435 Equity securities 33,860 Total investment securities(2) $ 4,226,653 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 $9.5 million and $6.6 million at June 30, 2023 and December 31, 2022, respectively, related to available-for-sale debt securities and $1.5 million and $1.5 million at June 30, 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 June 30, 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 $ 251,079 $ 245,016 $ — $ — Due after one year through five years 445,732 418,385 — — Due after five years through ten years 106,187 86,519 — — Due after ten years 2,885,931 2,542,558 900,315 788,435 Total $ 3,688,929 $ 3,292,478 $ 900,315 $ 788,435 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 June 30, 2023 U.S. Treasury securities $ 259,155 $ (9,662) $ 361,173 $ (16,821) $ 620,328 $ (26,483) U.S. government agency securities — — 103,686 (21,314) 103,686 (21,314) Residential mortgage-backed securities 1,024,801 (27,157) 1,531,907 (319,027) 2,556,708 (346,184) CRT securities — — 11,756 (2,470) 11,756 (2,470) Total $ 1,283,956 $ (36,819) $ 2,008,522 $ (359,632) $ 3,292,478 $ (396,451) 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 June 30, 2023, the Company had 112 available-for-sale debt securities in an unrealized loss position, comprised of 11 U.S. Treasury securities, five U.S. government agency securities, 94 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 accumulated other comprehensive income/loss, net (“AOCI”). Held-to-maturity securities consist of government guaranteed securities for which no loss is expected. At June 30, 2023 and December 31, 2022, no allowance for credit losses was established for available-for-sale or held-to-maturity debt securities. At June 30, 2023, debt securities with carrying values of approximately $1.6 million were pledged to secure certain customer deposits at June 30, 2023. At December 31, 2022, debt securities with carrying values of approximately $16.1 million and $1.4 million were pledged to secure certain customer repurchase agreements and deposits, 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 June 30, Six Months Ended June 30, (in thousands) 2023 2022 2023 2022 Net gains/(losses) recognized during the period $ 951 $ (4,996) $ 2,196 $ (8,636) Less: Realized net gains/(losses) recognized on securities sold (10) (204) (606) (2) Unrealized net gains/(losses) recognized on securities still held $ 961 $ (4,792) $ 2,802 $ (8,634)

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	6 Months Ended
	Jun. 30, 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 As discussed in Note 1 - Operations and Summary of Significant Accounting Policies, in the second quarter of 2023, changes were made to certain estimates used in the Company’s current expected credit loss model which resulted in adjustments being made to the Company’s portfolio segments. As a result, certain prior period balances below have been reclassified to conform to the current period presentation of portfolio segments. Loans are summarized by portfolio segment as follows: (in thousands) June 30, 2023 December 31, 2022 Loans held for investment(1): Commercial $ 10,459,640 $ 9,832,676 Mortgage finance 5,098,812 4,090,033 Commercial real estate 5,308,997 4,875,363 Consumer 531,635 552,848 Gross loans held for investment 21,399,084 19,350,920 Unearned income (net of direct origination costs) (73,069) (63,580) Total loans held for investment 21,326,015 19,287,340 Allowance for credit losses on loans (237,343) (253,469) Total loans held for investment, net $ 21,088,672 $ 19,033,871 Loans held for sale: Non-mortgage loans, at lower of cost or fair value 29,097 36,357 Total loans held for sale $ 29,097 $ 36,357 (1) Excludes accrued interest receivable of $105.7 million and $100.4 million at June 30, 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 Revolving lines of credit Revolving lines of credit converted to term loans Total June 30, 2023 Commercial (1-7) Pass $ 1,046,010 $ 1,914,964 $ 414,088 $ 173,152 $ 214,029 $ 365,905 $ 5,904,419 $ 18,637 $ 10,051,204 (8) Special mention 95 83,010 18,452 289 707 19,303 54,371 142 176,369 (9) Substandard - accruing 15,216 55,176 39,042 2,059 — 6,725 33,457 528 152,203 (9+) Non-accrual — 42,076 3,211 436 23,385 7,421 161 3,174 79,864 Total commercial $ 1,061,321 $ 2,095,226 $ 474,793 $ 175,936 $ 238,121 $ 399,354 $ 5,992,408 $ 22,481 $ 10,459,640 Mortgage finance (1-7) Pass $ 115,533 $ 54,104 $ 686,673 $ 341,626 $ 358,533 $ 3,542,343 $ — $ — $ 5,098,812 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 115,533 $ 54,104 $ 686,673 $ 341,626 $ 358,533 $ 3,542,343 $ — $ — $ 5,098,812 Commercial real estate (1-7) Pass $ 398,476 $ 1,533,734 $ 1,056,719 $ 625,786 $ 418,687 $ 634,714 $ 408,959 $ 23,700 $ 5,100,775 (8) Special mention 1,048 55,675 22,329 24,047 12,016 39,960 — 5,414 160,489 (9) Substandard - accruing — — 17,850 — — 29,708 — — 47,558 (9+) Non-accrual — — — — — 175 — — 175 Total commercial real estate $ 399,524 $ 1,589,409 $ 1,096,898 $ 649,833 $ 430,703 $ 704,557 $ 408,959 $ 29,114 $ 5,308,997 Consumer (1-7) Pass $ 19,368 $ 58,901 $ 89,294 $ 55,186 $ 14,480 $ 110,951 $ 180,651 $ 107 $ 528,938 (8) Special mention — — — — — 1,376 — — 1,376 (9) Substandard - accruing — — — — — — — 321 321 (9+) Non-accrual — — — — — 1,000 — — 1,000 Total consumer $ 19,368 $ 58,901 $ 89,294 $ 55,186 $ 14,480 $ 113,327 $ 180,651 $ 428 $ 531,635 Total $ 1,595,746 $ 3,797,640 $ 2,347,658 $ 1,222,581 $ 1,041,837 $ 4,759,581 $ 6,582,018 $ 52,023 $ 21,399,084 Gross charge-offs $ — $ 90 $ 19,828 $ — $ 8,243 $ 552 $ — $ 871 $ 29,584 (in thousands) 2022 2021 2020 2019 2018 2017 Revolving lines of credit Revolving lines of credit converted to term loans Total December 31, 2022 Commercial (1-7) Pass $ 2,022,950 $ 678,473 $ 240,511 $ 254,985 $ 322,099 $ 227,853 $ 5,694,352 $ 20,933 $ 9,462,156 (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 37,407 — 150,642 (9+) Non-accrual 376 512 751 30,392 6,226 2,520 6,265 — 47,042 Total commercial $ 2,051,137 $ 757,872 $ 245,404 $ 324,837 $ 355,256 $ 241,653 $ 5,833,334 $ 23,183 $ 9,832,676 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 Commercial real estate (1-7) Pass $ 1,362,160 $ 958,669 $ 670,113 $ 520,970 $ 263,240 $ 448,536 $ 465,834 $ 43,237 $ 4,732,759 (8) Special mention 3,494 6,524 46,512 5,295 19,350 4,038 — — 85,213 (9) Substandard - accruing 7,840 17,850 — 247 11,458 18,733 — — 56,128 (9+) Non-accrual — — 1,081 — — 182 — — 1,263 Total commercial real estate $ 1,373,494 $ 983,043 $ 717,706 $ 526,512 $ 294,048 $ 471,489 $ 465,834 $ 43,237 $ 4,875,363 Consumer (1-7) Pass $ 69,320 $ 95,470 $ 57,060 $ 24,773 $ 20,055 $ 89,919 $ 196,088 $ 130 $ 552,815 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — 33 — — — — 33 Total Consumer $ 69,320 $ 95,470 $ 57,060 $ 24,806 $ 20,055 $ 89,919 $ 196,088 $ 130 $ 552,848 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. The changes made to the Company’s current expected credit loss model, as discussed above and in Note 1 - Operations and Summary of Significant Accounting Policies, resulted in a reallocation of the allowance for credit losses between loan portfolio segments and allowance balances allocated to off-balance sheet financial instruments, the results of which are included in the table below. The changes made result in a higher allocation of losses to off-balance sheet financial instruments. See Note 6 - Financial Instruments with Off-Balance Sheet Risk for information regarding the allowance for credit losses on off-balance sheet financial instruments. Allocation of a portion of the allowance to one category does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Mortgage Commercial Real Estate Consumer Total Six Months Ended June 30, 2023 Beginning balance $ 185,303 $ 10,745 $ 54,268 $ 3,153 $ 253,469 Provision for credit losses on loans 18,198 (3,660) (1,730) (785) 12,023 Charge-offs 29,584 — — — 29,584 Recoveries 1,430 — — 5 1,435 Net charge-offs (recoveries) 28,154 — — (5) 28,149 Ending balance $ 175,347 $ 7,085 $ 52,538 $ 2,373 $ 237,343 Six Months Ended June 30, 2022 Beginning balance $ 154,360 $ 6,083 $ 48,247 $ 3,176 $ 211,866 Provision for credit losses on loans (10,128) 12,975 16,820 (383) 19,284 Charge-offs 2,978 — 350 — 3,328 Recoveries 1,172 — — 19 1,191 Net charge-offs (recoveries) 1,806 — 350 (19) 2,137 Ending balance $ 142,426 $ 19,058 $ 64,717 $ 2,812 $ 229,013 The Company recorded a $12.0 million provision for credit losses on loans for the six months ended June 30, 2023, compared to a $19.3 million provision for the same period of 2022. The $12.0 million provision for credit losses on loans resulted primarily from an increase in non-accrual loans and growth in loans held for investment during the six months ended June 30, 2023. Net charge-offs of $28.1 million were recorded during the six months ended June 30, 2023, compared to net charge-offs of $2.1 million during the same period of 2022. Criticized loans totaled $619.4 million at June 30, 2023, $513.2 million at December 31, 2022 and $603.5 million at June 30, 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 June 30, 2023, the Company had $40.4 million in collateral-dependent commercial loans, collateralized by business assets. 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 June 30, 2023 Commercial $ 2,273 $ 686 $ 64 $ 3,023 $ 79,864 $ 10,376,753 $ 10,459,640 $ 23,385 Mortgage finance — — — — — 5,098,812 5,098,812 — Commercial real estate 524 — — 524 175 5,308,298 5,308,997 — Consumer 11 — — 11 1,000 530,624 531,635 1,000 Total $ 2,808 $ 686 $ 64 $ 3,558 $ 81,039 $ 21,314,487 $ 21,399,084 $ 24,385 (1) As of June 30, 2023, $1.4 million of non-accrual loans were earning interest income on a cash basis compared to $2.2 million as of December 31, 2022. Additionally, $37,000 of interest income was recognized on non-accrual loans for the six months ended June 30, 2023 compared to none for the same period in 2022. Accrued interest of $1.6 million and $4,000 was reversed during the six months ended June 30, 2023 and June 30, 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 measurement of troubled debt restructurings and enhanced disclosures for loan modifications to borrowers experiencing financial difficulty. The table below details gross loans held for investment as of June 30, 2023 made to borrowers experiencing financial difficulty that were modified during the three and six months ended June 30, 2023: (in thousands) Payment Term Payment Interest Rate Total Percentage of Three Months Ended June 30, 2023 Commercial $ — $ 261 $ 3,378 $ — $ 3,639 0.02 % Total $ — $ 261 $ 3,378 $ — $ 3,639 0.02 % Six Months Ended June 30, 2023 Commercial $ 31,356 $ 1,144 $ 6,562 $ 14,532 $ 53,594 0.25 % Total $ 31,356 $ 1,144 $ 6,562 $ 14,532 $ 53,594 0.25 % The following table summarizes the financial impacts of loan modifications made to borrowers experiencing financial difficulty during the three and six months ended June 30, 2023: Interest Rate Term Extension Total Payment Three Months Ended June 30, 2023 Commercial —% 4 to 12 $ 358 Six Months Ended June 30, 2023 Commercial 0.70% 4 to 36 $ 5,080 As of June 30, 2023, commercial loans totaling $161,000 experienced a default subsequent to being granted a term extension modification in the prior twelve months. 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 as of June 30, 2023 made to borrowers experiencing financial difficulty that were modified on or after January 1, 2023, the date the Company adopted ASU 2022-02: (in thousands) 30-89 Days 90+ Days Non-Accrual Current Total June 30, 2023 Commercial $ — $ — $ 6,723 $ 46,871 $ 53,594 Total $ — $ — $ 6,723 $ 46,871 $ 53,594 Troubled Debt Restructuring Disclosures Prior to the Adoption of ASU 2022-02 The Company did not have any loans that were restructured during the six months ended June 30, 2022. As of December 31, 2022 and June 30, 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 June 30, 2022, $531,000 and $17.3 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	6 Months Ended
	Jun. 30, 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) June 30, 2023 December 31, 2022 Customer repurchase agreements $ — $ 1,142 Federal Home Loan Bank borrowings 1,350,000 1,200,000 Total short-term borrowings $ 1,350,000 $ 1,201,142 The table below presents a summary of long-term debt: (in thousands) June 30, 2023 December 31, 2022 Bank-issued floating rate senior unsecured credit-linked notes due 2024 $ 198,496 $ 272,492 Bank-issued 5.25% fixed rate subordinated notes due 2026 174,326 174,196 Company-issued 4.00% fixed rate subordinated notes due 2031 371,567 371,348 Trust preferred floating rate subordinated debentures due 2032 to 2036 113,406 113,406 Total long-term debt $ 857,795 $ 931,442

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	6 Months Ended
	Jun. 30, 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. The changes made to the Company’s current expected credit loss model, as discussed in Note 1 - Operations and Summary of Significant Accounting Policies, resulted in a reallocation of the allowance for credit losses between loan portfolio segments and allowance balances allocated to off-balance sheet financial instruments, the results of which are included in the table below. The changes made result in a higher allocation of losses to off-balance sheet financial instruments. See Note 4 - Loans and Allowance for Credit Losses on Loans for information regarding the allowance for credit losses on loans. (in thousands) Commercial Mortgage Commercial Consumer Total Six Months Ended June 30, 2023 Beginning balance $ 16,550 $ — $ 5,222 $ 21 $ 21,793 Provision for off-balance sheet credit losses 17,187 — 5,693 97 22,977 Ending balance $ 33,737 $ — $ 10,915 $ 118 $ 44,770 Six Months Ended June 30, 2022 Beginning balance $ 15,107 $ — $ 2,136 $ 22 $ 17,265 Provision for off-balance sheet credit losses (1,656) — 2,376 (4) 716 Ending balance $ 13,451 $ — $ 4,512 $ 18 $ 17,981 (in thousands) June 30, 2023 December 31, 2022 Commitments to extend credit - period end balance $ 9,973,209 $ 9,673,082 Standby letters of credit - period end balance 488,525 417,896

Regulatory Ratios and Capital

Regulatory Ratios and Capital	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2023 or 2022. In January 2023, the Company completed the full $150.0 million of share 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 six months ended June 30, 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 June 30, 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 June 30, 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 June 30, 2023 CET1 Company $ 3,225,555 12.18 % $ 1,854,443 7.00 % N/A N/A Bank 3,516,575 13.31 % 1,849,426 7.00 % 1,717,324 6.50 % Total capital (to risk-weighted assets) Company 4,351,950 16.43 % 2,781,665 10.50 % 2,649,204 10.00 % Bank 4,071,403 15.41 % 2,774,139 10.50 % 2,642,037 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,635,555 13.72 % 2,251,824 8.50 % 1,589,523 6.00 % Bank 3,676,575 13.92 % 2,245,731 8.50 % 2,113,630 8.00 % Tier 1 capital (to average assets)(1) Company 3,635,555 12.39 % 1,173,583 4.00 % N/A N/A Bank 3,676,575 12.55 % 1,171,431 4.00 % 1,464,288 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 June 30, 2023 and December 31, 2022.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2023
Compensation Related Costs [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company has 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 the Company’s stock-based compensation expense: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2023 2022 2023 2022 Stock-settled awards: RSUs $ 5,069 $ 5,022 $ 13,507 $ 10,429 Cash-settled units — 2 — 183 Total $ 5,069 $ 5,024 $ 13,507 $ 10,612 (in thousands except period data) June 30, 2023 Unrecognized compensation expense related to unvested stock-settled awards $ 40,155 Weighted average period over which expense is expected to be recognized, in years 2.3

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 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 the Company’s 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 June 30, 2023 Available-for-sale debt securities:(1) U.S. Treasury securities $ 620,328 $ — $ — U.S. government agency securities — 103,686 — Residential mortgage-backed securities — 2,556,708 — CRT securities — — 11,756 Equity securities(1)(2) 22,783 11,077 — Loans held for investment(3) — — 26,047 Derivative assets(4) — 10,768 — Derivative liabilities(4) — 97,909 — Non-qualified deferred compensation plan liabilities(5) 21,149 — — 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(5) 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 June 30, 2023 Available-for-sale debt securities:(1) CRT securities $ 11,928 $ — $ — $ — $ (172) $ 11,756 Three Months Ended June 30, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 165,845 $ — $ (166,890) $ — $ 1,045 $ — CRT securities 11,901 — — — (231) 11,670 Loans held for sale(2) 8,085 — (4,029) — 210 4,266 Six Months Ended June 30, 2023 Available-for-sale debt securities:(1) CRT securities $ 11,861 $ — $ — $ — $ (105) $ 11,756 Six Months Ended June 30, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 180,033 $ — $ (170,626) $ — $ (9,407) $ — CRT securities 11,846 — — — (176) 11,670 Loans held for sale(2) 7,658 1,327 (4,600) — (119) 4,266 (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 June 30, 2023, the discount rates utilized ranged from 6.25% to 11.37% and the weighted-average life ranged from 4.83 years to 8.17 years. On a combined amortized cost weighted-average basis a discount rate of 8.01% and a weighted-average life of 5.98 years were utilized to determine the fair value of these securities at June 30, 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 $26.0 million fair value of loans held for investment at June 30, 2023 reported above includes impaired loans with a carrying value of $40.4 million that were reduced by specific allowance allocations totaling $14.3 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 June 30, 2023 Financial assets: Cash and cash equivalents $ 2,847,445 $ 2,847,445 $ 2,847,445 $ — $ — Available-for-sale debt securities 3,292,478 3,292,478 620,328 2,660,394 11,756 Held-to-maturity debt securities 900,315 788,435 — 788,435 — Equity securities 33,860 33,860 22,783 11,077 — Loans held for sale 29,097 29,097 — 29,097 — Loans held for investment, net 21,088,672 21,016,413 — — 21,016,413 Derivative assets 10,768 10,768 — 10,768 — Financial liabilities: Total deposits 23,318,240 23,497,477 — — 23,497,477 Short-term borrowings 1,350,000 1,350,000 — 1,350,000 — Long-term debt 857,795 768,222 — 768,222 — Derivative liabilities 97,909 97,909 — 97,909 — 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	6 Months Ended
	Jun. 30, 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. June 30, 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 $ — $ 108,292 $ 3,000,000 $ — $ 86,378 Non-hedging derivatives Customer-initiated and other derivatives: Foreign currency forward contracts 2,682 38 24 — — — Interest rate contracts: Swaps 5,036,185 87,403 87,377 4,396,367 83,529 83,529 Caps and floors written 1,251,159 2,661 4,636 220,142 — 2,583 Caps and floors purchased 1,251,159 4,636 2,661 220,142 2,583 — Forward contracts 7,274,246 14,220 13,515 1,569,326 4,431 4,053 Gross derivatives 108,958 216,505 90,543 176,543 Netting adjustment - offsetting derivative assets/liabilities (26,524) (26,524) (5,164) (5,164) Netting adjustment - cash collateral received/posted (71,666) (92,072) (71,875) (79,621) Net derivatives included on the consolidated balance sheets $ 10,768 $ 97,909 $ 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 $10.8 million at June 30, 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 June 30, 2023, the Company had $156.9 million in cash collateral pledged to counterparties included in interest bearing cash and cash equivalents on the consolidated balance sheet and $74.5 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 17 risk participation agreements where it acts as a participant bank with a notional amount of $328.2 million at June 30, 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 $9.0 million at June 30, 2023 and $8.9 million at December 31, 2022. The fair value of these exposures was insignificant to the consolidated financial statements at both June 30, 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 12 risk participation agreements where the Company acts as the lead bank having a notional amount of $166.5 million at June 30, 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 six months ended June 30, 2023, the Company recorded $45.5 million in unrealized losses to adjust its cash flow hedges to fair value, which was recorded net of tax to AOCI, and reclassified $26.0 million from AOCI into interest income on loans. Based on current market conditions, the Company estimates that during the next 12 months, an additional $68.9 million will be reclassified from AOCI as a decrease to interest income. As of June 30, 2023, the maximum length of time over which forecasted transactions are hedged is 3.25 years.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 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 June 30, 2023 Beginning balance $ (46,916) $ (281,063) $ (46,783) $ (374,762) Change in unrealized gain/(loss) (59,057) (40,674) — (99,731) Amounts reclassified into net income 14,919 — 1,843 16,762 Total other comprehensive income/(loss) (44,138) (40,674) 1,843 (82,969) Income tax expense/(benefit) (9,269) (8,541) 387 (17,423) Total other comprehensive income/(loss), net of tax (34,869) (32,133) 1,456 (65,546) Ending balance $ (81,785) $ (313,196) $ (45,327) $ (440,308) Three Months Ended June 30, 2022 Beginning balance $ — $ (151,564) $ (53,861) $ (205,425) Change in unrealized gain/(loss) 304 (86,742) — (86,438) Amounts reclassified into net income (704) — 2,607 1,903 Total other comprehensive income/(loss) (400) (86,742) 2,607 (84,535) Income tax expense/(benefit) (84) (18,216) 548 (17,752) Total other comprehensive income/(loss), net of tax (316) (68,526) 2,059 (66,783) Ending balance $ (316) $ (220,090) $ (51,802) $ (272,208) Six Months Ended June 30, 2023 Beginning balance $ (66,394) $ (304,309) $ (48,240) $ (418,943) Change in unrealized gain/(loss) (45,529) (11,249) — (56,778) Amounts reclassified into net income 26,048 — 3,687 29,735 Total other comprehensive income/(loss) (19,481) (11,249) 3,687 (27,043) Income tax expense/(benefit) (4,090) (2,362) 774 (5,678) Total other comprehensive income/(loss), net of tax (15,391) (8,887) 2,913 (21,365) Ending balance $ (81,785) $ (313,196) $ (45,327) $ (440,308) Six Months Ended June 30, 2022 Beginning balance $ — $ (47,715) $ — $ (47,715) Change in unrealized gain/(loss) 304 (218,196) (69,165) (287,057) Amounts reclassified into net income (704) — 3,593 2,889 Total other comprehensive income/(loss) (400) (218,196) (65,572) (284,168) Income tax expense/(benefit) (84) (45,821) (13,770) (59,675) Total other comprehensive income/(loss), net of tax (316) (172,375) (51,802) (224,493) Ending balance $ (316) $ (220,090) $ (51,802) $ (272,208)

New Accounting Standards

New Accounting Standards	6 Months Ended
	Jun. 30, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Standards	New Accounting Standards There were no accounting standards or updates issued during the second quarter of 2023.

Operations and Summary of Sig_2

Operations and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 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 the Company’s 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 the consolidated financial statements, and notes thereto, for the year ended December 31, 2022, included in the Company’s 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. In the second quarter of 2023, changes were made to certain estimates used in the Company’s current expected credit loss model, the most significant of which are more granular estimates of historical loss rates to incorporate probability of default and loss severities and allocations of expected losses to outstanding loan balances and off-balance sheet financial instruments. As a result of these changes, corresponding adjustments were also made to the Company’s portfolio segments to appropriately pool loans with similar risk characteristics and to the speed at which the Company reverts to historical loss rates for periods beyond which management is able to develop reasonable and supportable forecasts. The below accounting policy from the Company’s 2022 Form 10-K has been updated to incorporate these changes.
New Accounting Standards	There were no accounting standards or updates issued during the second quarter of 2023.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Credit Losses The Company’s allowance for credit losses is determined using a current expected credit loss (“CECL”) model. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. The following is a discussion of the allowance for credit losses on loans held for investment and off-balance sheet credit exposures. See Note 1 - Operations and Summary of Significant Accounting Policies - Investment Securities - Debt Securities in the Company’s 2022 Form 10-K for discussion of the allowance for credit losses on available-for-sale and held-to-maturity debt securities. The CECL methodology recognizes lifetime expected credit losses immediately when a financial asset is originated or purchased. The allowance for credit losses on loans is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the allowance when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. The allowance for credit losses on off-balance sheet financial instruments is recorded in other liabilities on the consolidated balance sheets, Management estimates the allowance balance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, credit quality, or term, as well as for changes in macroeconomic conditions, such as changes in unemployment rates, gross domestic product, property values, or other relevant factors. The allowance for credit losses is comprised of reserves measured on a collective (pool) basis when similar risk characteristics exist. Loans that do not share risk characteristics are assigned a reserve based on an individual evaluation and are not included in the collective (pool) evaluation. For purposes of determining the collective (pool) allowance for credit losses, the loan portfolio is segregated into pools first by portfolio segment and then by past due status or credit grade. Each pool is assigned a loss estimate, reflecting historical loss rates that incorporate probability of default and severity of losses over the estimated remaining life of the loans. These loss estimates are then modified to incorporate a reasonable and supportable forecast of future losses at the pool level, as well as any necessary qualitative adjustments using a Portfolio Level Qualitative Factor (“PLQF”) and/or a Portfolio Segment Level Qualitative Factor (“SLQF”). A similar process is employed to calculate a reserve assigned to off-balance financial instruments, specifically unfunded loan commitments and letters of credit. Modified loss estimates are assigned based on the balance of the commitments estimated to be outstanding at the time of default. The PLQF and SLQF are utilized to address factors that are not present in historical loss rates and are otherwise unaccounted for in the quantitative process. The PLQF is used to apply a qualitative adjustment across the entire portfolio of loans, while the SLQF is designed to apply a qualitative adjustment across a single portfolio segment. Even though portions of the allowance may be allocated to specific loans, the entire allowance is available for any credit that, in management’s judgment, should be charged off. The Company generally uses a two-year forecast period, based on a single forecast scenario or a blend of multiple forecast scenarios, using variables management believes are most relevant to each portfolio segment. For periods beyond which management is able to develop reasonable and supportable forecasts, the Company reverts to the average historical loss rate, reflecting historical default probabilities and loss severities, using a reversion speed that approximates 1 to 2 years. The forecast period and scenario(s) used are reviewed on a quarterly basis and may be adjusted based on management's view of the current economic conditions and level of predictability the forecast can provide. Portfolio segments are used to pool loans with similar risk characteristics and align with the Company’s methodology for measuring expected credit losses. A summary of the primary portfolio segments is as follows: Commercial. The commercial loan portfolio is comprised of lines of credit for working capital, term loans, reserve-based loans to energy exploration and production companies, and leases to finance equipment and other business assets across a variety of industries. These loans are used for general corporate purposes including financing working capital, internal growth, and acquisitions and are generally secured by accounts receivable, inventory, oil and gas reserves, equipment and other assets of clients’ businesses. Mortgage Finance. Mortgage finance loans relate to mortgage warehouse lending operations in which the Company purchases mortgage loan ownership interests from unaffiliated mortgage originators that are generally held for a period of less than 30 days and more typically 10-20 days before they are sold to an approved investor. Volumes fluctuate based on the level of market demand for the product and the number of days between purchase and sale of the loans, which can be affected by changes in overall market interest rates and housing demand and tend to peak at the end of each month. Mortgage finance loans are consistently underwritten based on standards established by the approved investors. Market conditions or events of default by an investor or originator could require that the Company repurchases the remaining interests in the mortgage loans and hold them beyond the expected 10-20 days. Commercial Real Estate (“CRE”). The CRE portfolio is comprised of construction/development financing and limited term financing provided to professional real estate developers, owners/managers of commercial real estate projects and properties, and residential builders/developers. Collateral properties include office buildings, warehouse/distribution buildings, shopping centers, hotels/motels, senior living, apartment buildings, residential and commercial tract developments, and raw land or lots to be developed into single-family homes. The primary source of repayment on these loans is expected to come from the sale, permanent financing or lease of the real property collateral. The performance of these loans is impacted by fluctuations in collateral values, the ability of the borrower to obtain permanent financing, and, in the case of loans to residential builder/developers, volatility in consumer demand. Consumer. This category of loans is comprised of loans made to consumers for personal expenditures, first and second lien mortgages made for the purpose of purchasing or constructing 1-4 family residential dwellings and home equity revolving lines of credit. The Company has several pass credit grades that are assigned to loans based on varying levels of risk, ranging from credits that are secured by cash or marketable securities, to watch credits which have all the characteristics of an acceptable credit risk but warrant more than the normal level of monitoring. Within the criticized/classified credit grades are special mention, substandard and doubtful. Special mention loans are those that are currently protected by the sound worth and paying capacity of the borrower, but that are potentially weak and constitute an additional credit risk. These loans have the potential to deteriorate to a substandard grade due to the existence of financial or administrative deficiencies. Substandard loans have a well-defined weakness or weaknesses that jeopardizes the liquidation of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Some substandard loans are inadequately protected by the sound worth and paying capacity of the borrower and of the collateral pledged and may be considered impaired. Substandard loans can be accruing or can be on non-accrual depending on the circumstances of the individual loans. Loans classified as doubtful have all the weaknesses inherent in substandard loans with the added characteristics that the weaknesses make collection in full highly questionable and improbable. The possibility of loss is extremely high. All doubtful loans are on non-accrual. The methodology used in the estimation of the allowance, which is performed at least quarterly, is designed to be dynamic and responsive to changes in portfolio credit quality and forecasted economic conditions. Changes are reflected in the pool-basis allowance and in reserves assigned on an individual basis as the collectability of classified loans is evaluated with new information. As the Company’s portfolio has matured, historical loss ratios have been closely monitored. The review of the appropriateness of the allowance is performed by executive management and presented to the audit and risk committees of the board of directors for their review. The committees report to the board as part of the board's quarterly review of the Company’s consolidated financial statements. When management determines that foreclosure is probable, and for certain collateral-dependent loans where foreclosure is not considered probable, expected credit losses are based on the estimated fair value of the collateral adjusted for selling costs, when appropriate. 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. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals and modifications unless either of the following applies: management has a reasonable expectation that a loan will be restructured or the extension or renewal options are included in the borrower contract and are not unconditionally cancellable. The Company does not measure an allowance for credit losses on accrued interest receivable balances because these balances are written off in a timely manner as a reduction to interest income when loans are placed on non-accrual status as discussed above.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 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 June 30, Six Months Ended June 30, (in thousands except share and per share data) 2023 2022 2023 2022 Numerator: Net income $ 68,651 $ 34,159 $ 107,312 $ 73,809 Preferred stock dividends 4,312 4,312 8,625 8,625 Net income available to common stockholders $ 64,339 $ 29,847 $ 98,687 $ 65,184 Denominator: Basic earnings per common share—weighted average common shares 47,906,624 50,258,681 48,166,977 50,462,735 Effect of dilutive outstanding stock-settled awards 514,652 542,947 569,405 607,034 Dilutive earnings per common share—weighted average diluted common shares 48,421,276 50,801,628 48,736,382 51,069,769 Basic earnings per common share $ 1.34 $ 0.59 $ 2.05 $ 1.29 Diluted earnings per common share $ 1.33 $ 0.59 $ 2.02 $ 1.28 Anti-dilutive outstanding stock-settled awards 533,363 430,224 341,728 301,842

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2023 Available-for-sale debt securities: U.S. Treasury securities $ 646,811 $ — $ (26,483) $ 620,328 U.S. government agency securities 125,000 — (21,314) 103,686 Residential mortgage-backed securities 2,902,892 — (346,184) 2,556,708 CRT securities 14,226 — (2,470) 11,756 Total available-for-sale debt securities 3,688,929 — (396,451) 3,292,478 Held-to-maturity debt securities: Residential mortgage-backed securities 900,315 — (111,880) 788,435 Total held-to-maturity debt securities 900,315 — (111,880) 788,435 Equity securities 33,860 Total investment securities(2) $ 4,226,653 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 $9.5 million and $6.6 million at June 30, 2023 and December 31, 2022, respectively, related to available-for-sale debt securities and $1.5 million and $1.5 million at June 30, 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 June 30, 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 $ 251,079 $ 245,016 $ — $ — Due after one year through five years 445,732 418,385 — — Due after five years through ten years 106,187 86,519 — — Due after ten years 2,885,931 2,542,558 900,315 788,435 Total $ 3,688,929 $ 3,292,478 $ 900,315 $ 788,435
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 June 30, 2023 U.S. Treasury securities $ 259,155 $ (9,662) $ 361,173 $ (16,821) $ 620,328 $ (26,483) U.S. government agency securities — — 103,686 (21,314) 103,686 (21,314) Residential mortgage-backed securities 1,024,801 (27,157) 1,531,907 (319,027) 2,556,708 (346,184) CRT securities — — 11,756 (2,470) 11,756 (2,470) Total $ 1,283,956 $ (36,819) $ 2,008,522 $ (359,632) $ 3,292,478 $ (396,451) 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 June 30, Six Months Ended June 30, (in thousands) 2023 2022 2023 2022 Net gains/(losses) recognized during the period $ 951 $ (4,996) $ 2,196 $ (8,636) Less: Realized net gains/(losses) recognized on securities sold (10) (204) (606) (2) Unrealized net gains/(losses) recognized on securities still held $ 961 $ (4,792) $ 2,802 $ (8,634)

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	6 Months Ended
	Jun. 30, 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) June 30, 2023 December 31, 2022 Loans held for investment(1): Commercial $ 10,459,640 $ 9,832,676 Mortgage finance 5,098,812 4,090,033 Commercial real estate 5,308,997 4,875,363 Consumer 531,635 552,848 Gross loans held for investment 21,399,084 19,350,920 Unearned income (net of direct origination costs) (73,069) (63,580) Total loans held for investment 21,326,015 19,287,340 Allowance for credit losses on loans (237,343) (253,469) Total loans held for investment, net $ 21,088,672 $ 19,033,871 Loans held for sale: Non-mortgage loans, at lower of cost or fair value 29,097 36,357 Total loans held for sale $ 29,097 $ 36,357 (1) Excludes accrued interest receivable of $105.7 million and $100.4 million at June 30, 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 Revolving lines of credit Revolving lines of credit converted to term loans Total June 30, 2023 Commercial (1-7) Pass $ 1,046,010 $ 1,914,964 $ 414,088 $ 173,152 $ 214,029 $ 365,905 $ 5,904,419 $ 18,637 $ 10,051,204 (8) Special mention 95 83,010 18,452 289 707 19,303 54,371 142 176,369 (9) Substandard - accruing 15,216 55,176 39,042 2,059 — 6,725 33,457 528 152,203 (9+) Non-accrual — 42,076 3,211 436 23,385 7,421 161 3,174 79,864 Total commercial $ 1,061,321 $ 2,095,226 $ 474,793 $ 175,936 $ 238,121 $ 399,354 $ 5,992,408 $ 22,481 $ 10,459,640 Mortgage finance (1-7) Pass $ 115,533 $ 54,104 $ 686,673 $ 341,626 $ 358,533 $ 3,542,343 $ — $ — $ 5,098,812 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — — — — — — — Total mortgage finance $ 115,533 $ 54,104 $ 686,673 $ 341,626 $ 358,533 $ 3,542,343 $ — $ — $ 5,098,812 Commercial real estate (1-7) Pass $ 398,476 $ 1,533,734 $ 1,056,719 $ 625,786 $ 418,687 $ 634,714 $ 408,959 $ 23,700 $ 5,100,775 (8) Special mention 1,048 55,675 22,329 24,047 12,016 39,960 — 5,414 160,489 (9) Substandard - accruing — — 17,850 — — 29,708 — — 47,558 (9+) Non-accrual — — — — — 175 — — 175 Total commercial real estate $ 399,524 $ 1,589,409 $ 1,096,898 $ 649,833 $ 430,703 $ 704,557 $ 408,959 $ 29,114 $ 5,308,997 Consumer (1-7) Pass $ 19,368 $ 58,901 $ 89,294 $ 55,186 $ 14,480 $ 110,951 $ 180,651 $ 107 $ 528,938 (8) Special mention — — — — — 1,376 — — 1,376 (9) Substandard - accruing — — — — — — — 321 321 (9+) Non-accrual — — — — — 1,000 — — 1,000 Total consumer $ 19,368 $ 58,901 $ 89,294 $ 55,186 $ 14,480 $ 113,327 $ 180,651 $ 428 $ 531,635 Total $ 1,595,746 $ 3,797,640 $ 2,347,658 $ 1,222,581 $ 1,041,837 $ 4,759,581 $ 6,582,018 $ 52,023 $ 21,399,084 Gross charge-offs $ — $ 90 $ 19,828 $ — $ 8,243 $ 552 $ — $ 871 $ 29,584 (in thousands) 2022 2021 2020 2019 2018 2017 Revolving lines of credit Revolving lines of credit converted to term loans Total December 31, 2022 Commercial (1-7) Pass $ 2,022,950 $ 678,473 $ 240,511 $ 254,985 $ 322,099 $ 227,853 $ 5,694,352 $ 20,933 $ 9,462,156 (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 37,407 — 150,642 (9+) Non-accrual 376 512 751 30,392 6,226 2,520 6,265 — 47,042 Total commercial $ 2,051,137 $ 757,872 $ 245,404 $ 324,837 $ 355,256 $ 241,653 $ 5,833,334 $ 23,183 $ 9,832,676 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 Commercial real estate (1-7) Pass $ 1,362,160 $ 958,669 $ 670,113 $ 520,970 $ 263,240 $ 448,536 $ 465,834 $ 43,237 $ 4,732,759 (8) Special mention 3,494 6,524 46,512 5,295 19,350 4,038 — — 85,213 (9) Substandard - accruing 7,840 17,850 — 247 11,458 18,733 — — 56,128 (9+) Non-accrual — — 1,081 — — 182 — — 1,263 Total commercial real estate $ 1,373,494 $ 983,043 $ 717,706 $ 526,512 $ 294,048 $ 471,489 $ 465,834 $ 43,237 $ 4,875,363 Consumer (1-7) Pass $ 69,320 $ 95,470 $ 57,060 $ 24,773 $ 20,055 $ 89,919 $ 196,088 $ 130 $ 552,815 (8) Special mention — — — — — — — — — (9) Substandard - accruing — — — — — — — — — (9+) Non-accrual — — — 33 — — — — 33 Total Consumer $ 69,320 $ 95,470 $ 57,060 $ 24,806 $ 20,055 $ 89,919 $ 196,088 $ 130 $ 552,848 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. The changes made to the Company’s current expected credit loss model, as discussed above and in Note 1 - Operations and Summary of Significant Accounting Policies, resulted in a reallocation of the allowance for credit losses between loan portfolio segments and allowance balances allocated to off-balance sheet financial instruments, the results of which are included in the table below. The changes made result in a higher allocation of losses to off-balance sheet financial instruments. See Note 6 - Financial Instruments with Off-Balance Sheet Risk for information regarding the allowance for credit losses on off-balance sheet financial instruments. Allocation of a portion of the allowance to one category does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Mortgage Commercial Real Estate Consumer Total Six Months Ended June 30, 2023 Beginning balance $ 185,303 $ 10,745 $ 54,268 $ 3,153 $ 253,469 Provision for credit losses on loans 18,198 (3,660) (1,730) (785) 12,023 Charge-offs 29,584 — — — 29,584 Recoveries 1,430 — — 5 1,435 Net charge-offs (recoveries) 28,154 — — (5) 28,149 Ending balance $ 175,347 $ 7,085 $ 52,538 $ 2,373 $ 237,343 Six Months Ended June 30, 2022 Beginning balance $ 154,360 $ 6,083 $ 48,247 $ 3,176 $ 211,866 Provision for credit losses on loans (10,128) 12,975 16,820 (383) 19,284 Charge-offs 2,978 — 350 — 3,328 Recoveries 1,172 — — 19 1,191 Net charge-offs (recoveries) 1,806 — 350 (19) 2,137 Ending balance $ 142,426 $ 19,058 $ 64,717 $ 2,812 $ 229,013
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 June 30, 2023 Commercial $ 2,273 $ 686 $ 64 $ 3,023 $ 79,864 $ 10,376,753 $ 10,459,640 $ 23,385 Mortgage finance — — — — — 5,098,812 5,098,812 — Commercial real estate 524 — — 524 175 5,308,298 5,308,997 — Consumer 11 — — 11 1,000 530,624 531,635 1,000 Total $ 2,808 $ 686 $ 64 $ 3,558 $ 81,039 $ 21,314,487 $ 21,399,084 $ 24,385 (1) As of June 30, 2023, $1.4 million of non-accrual loans were earning interest income on a cash basis compared to $2.2 million as of December 31, 2022. Additionally, $37,000 of interest income was recognized on non-accrual loans for the six months ended June 30, 2023 compared to none for the same period in 2022. Accrued interest of $1.6 million and $4,000 was reversed during the six months ended June 30, 2023 and June 30, 2022, respectively.
Summary of loan modifications	The table below details gross loans held for investment as of June 30, 2023 made to borrowers experiencing financial difficulty that were modified during the three and six months ended June 30, 2023: (in thousands) Payment Term Payment Interest Rate Total Percentage of Three Months Ended June 30, 2023 Commercial $ — $ 261 $ 3,378 $ — $ 3,639 0.02 % Total $ — $ 261 $ 3,378 $ — $ 3,639 0.02 % Six Months Ended June 30, 2023 Commercial $ 31,356 $ 1,144 $ 6,562 $ 14,532 $ 53,594 0.25 % Total $ 31,356 $ 1,144 $ 6,562 $ 14,532 $ 53,594 0.25 % The following table summarizes the financial impacts of loan modifications made to borrowers experiencing financial difficulty during the three and six months ended June 30, 2023: Interest Rate Term Extension Total Payment Three Months Ended June 30, 2023 Commercial —% 4 to 12 $ 358 Six Months Ended June 30, 2023 Commercial 0.70% 4 to 36 $ 5,080 The table below provides an age analysis of gross loans held for investment as of June 30, 2023 made to borrowers experiencing financial difficulty that were modified on or after January 1, 2023, the date the Company adopted ASU 2022-02: (in thousands) 30-89 Days 90+ Days Non-Accrual Current Total June 30, 2023 Commercial $ — $ — $ 6,723 $ 46,871 $ 53,594 Total $ — $ — $ 6,723 $ 46,871 $ 53,594

Short-Term Borrowings and Lon_2

Short-Term Borrowings and Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Summary of borrowings	The table below presents a summary of short-term borrowings: (in thousands) June 30, 2023 December 31, 2022 Customer repurchase agreements $ — $ 1,142 Federal Home Loan Bank borrowings 1,350,000 1,200,000 Total short-term borrowings $ 1,350,000 $ 1,201,142
Summary of significant terms of preferred subordinated debentures	The table below presents a summary of long-term debt: (in thousands) June 30, 2023 December 31, 2022 Bank-issued floating rate senior unsecured credit-linked notes due 2024 $ 198,496 $ 272,492 Bank-issued 5.25% fixed rate subordinated notes due 2026 174,326 174,196 Company-issued 4.00% fixed rate subordinated notes due 2031 371,567 371,348 Trust preferred floating rate subordinated debentures due 2032 to 2036 113,406 113,406 Total long-term debt $ 857,795 $ 931,442

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Tables)	6 Months Ended
	Jun. 30, 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. The changes made to the Company’s current expected credit loss model, as discussed in Note 1 - Operations and Summary of Significant Accounting Policies, resulted in a reallocation of the allowance for credit losses between loan portfolio segments and allowance balances allocated to off-balance sheet financial instruments, the results of which are included in the table below. The changes made result in a higher allocation of losses to off-balance sheet financial instruments. See Note 4 - Loans and Allowance for Credit Losses on Loans for information regarding the allowance for credit losses on loans. (in thousands) Commercial Mortgage Commercial Consumer Total Six Months Ended June 30, 2023 Beginning balance $ 16,550 $ — $ 5,222 $ 21 $ 21,793 Provision for off-balance sheet credit losses 17,187 — 5,693 97 22,977 Ending balance $ 33,737 $ — $ 10,915 $ 118 $ 44,770 Six Months Ended June 30, 2022 Beginning balance $ 15,107 $ — $ 2,136 $ 22 $ 17,265 Provision for off-balance sheet credit losses (1,656) — 2,376 (4) 716 Ending balance $ 13,451 $ — $ 4,512 $ 18 $ 17,981 (in thousands) June 30, 2023 December 31, 2022 Commitments to extend credit - period end balance $ 9,973,209 $ 9,673,082 Standby letters of credit - period end balance 488,525 417,896

Regulatory Ratios and Capital (

Regulatory Ratios and Capital (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2023 CET1 Company $ 3,225,555 12.18 % $ 1,854,443 7.00 % N/A N/A Bank 3,516,575 13.31 % 1,849,426 7.00 % 1,717,324 6.50 % Total capital (to risk-weighted assets) Company 4,351,950 16.43 % 2,781,665 10.50 % 2,649,204 10.00 % Bank 4,071,403 15.41 % 2,774,139 10.50 % 2,642,037 10.00 % Tier 1 capital (to risk-weighted assets) Company 3,635,555 13.72 % 2,251,824 8.50 % 1,589,523 6.00 % Bank 3,676,575 13.92 % 2,245,731 8.50 % 2,113,630 8.00 % Tier 1 capital (to average assets)(1) Company 3,635,555 12.39 % 1,173,583 4.00 % N/A N/A Bank 3,676,575 12.55 % 1,171,431 4.00 % 1,464,288 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)	6 Months Ended
	Jun. 30, 2023
Compensation Related Costs [Abstract]
Schedule of stock-based compensation costs	The table below summarizes the Company’s stock-based compensation expense: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2023 2022 2023 2022 Stock-settled awards: RSUs $ 5,069 $ 5,022 $ 13,507 $ 10,429 Cash-settled units — 2 — 183 Total $ 5,069 $ 5,024 $ 13,507 $ 10,612
Schedule of unrecognized compensation costs	(in thousands except period data) June 30, 2023 Unrecognized compensation expense related to unvested stock-settled awards $ 40,155 Weighted average period over which expense is expected to be recognized, in years 2.3

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2023 Available-for-sale debt securities:(1) U.S. Treasury securities $ 620,328 $ — $ — U.S. government agency securities — 103,686 — Residential mortgage-backed securities — 2,556,708 — CRT securities — — 11,756 Equity securities(1)(2) 22,783 11,077 — Loans held for investment(3) — — 26,047 Derivative assets(4) — 10,768 — Derivative liabilities(4) — 97,909 — Non-qualified deferred compensation plan liabilities(5) 21,149 — — 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(5) 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 June 30, 2023 Available-for-sale debt securities:(1) CRT securities $ 11,928 $ — $ — $ — $ (172) $ 11,756 Three Months Ended June 30, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 165,845 $ — $ (166,890) $ — $ 1,045 $ — CRT securities 11,901 — — — (231) 11,670 Loans held for sale(2) 8,085 — (4,029) — 210 4,266 Six Months Ended June 30, 2023 Available-for-sale debt securities:(1) CRT securities $ 11,861 $ — $ — $ — $ (105) $ 11,756 Six Months Ended June 30, 2022 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 180,033 $ — $ (170,626) $ — $ (9,407) $ — CRT securities 11,846 — — — (176) 11,670 Loans held for sale(2) 7,658 1,327 (4,600) — (119) 4,266 (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 June 30, 2023 Financial assets: Cash and cash equivalents $ 2,847,445 $ 2,847,445 $ 2,847,445 $ — $ — Available-for-sale debt securities 3,292,478 3,292,478 620,328 2,660,394 11,756 Held-to-maturity debt securities 900,315 788,435 — 788,435 — Equity securities 33,860 33,860 22,783 11,077 — Loans held for sale 29,097 29,097 — 29,097 — Loans held for investment, net 21,088,672 21,016,413 — — 21,016,413 Derivative assets 10,768 10,768 — 10,768 — Financial liabilities: Total deposits 23,318,240 23,497,477 — — 23,497,477 Short-term borrowings 1,350,000 1,350,000 — 1,350,000 — Long-term debt 857,795 768,222 — 768,222 — Derivative liabilities 97,909 97,909 — 97,909 — 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)	6 Months Ended
	Jun. 30, 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. June 30, 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 $ — $ 108,292 $ 3,000,000 $ — $ 86,378 Non-hedging derivatives Customer-initiated and other derivatives: Foreign currency forward contracts 2,682 38 24 — — — Interest rate contracts: Swaps 5,036,185 87,403 87,377 4,396,367 83,529 83,529 Caps and floors written 1,251,159 2,661 4,636 220,142 — 2,583 Caps and floors purchased 1,251,159 4,636 2,661 220,142 2,583 — Forward contracts 7,274,246 14,220 13,515 1,569,326 4,431 4,053 Gross derivatives 108,958 216,505 90,543 176,543 Netting adjustment - offsetting derivative assets/liabilities (26,524) (26,524) (5,164) (5,164) Netting adjustment - cash collateral received/posted (71,666) (92,072) (71,875) (79,621) Net derivatives included on the consolidated balance sheets $ 10,768 $ 97,909 $ 13,504 $ 91,758

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2023 Beginning balance $ (46,916) $ (281,063) $ (46,783) $ (374,762) Change in unrealized gain/(loss) (59,057) (40,674) — (99,731) Amounts reclassified into net income 14,919 — 1,843 16,762 Total other comprehensive income/(loss) (44,138) (40,674) 1,843 (82,969) Income tax expense/(benefit) (9,269) (8,541) 387 (17,423) Total other comprehensive income/(loss), net of tax (34,869) (32,133) 1,456 (65,546) Ending balance $ (81,785) $ (313,196) $ (45,327) $ (440,308) Three Months Ended June 30, 2022 Beginning balance $ — $ (151,564) $ (53,861) $ (205,425) Change in unrealized gain/(loss) 304 (86,742) — (86,438) Amounts reclassified into net income (704) — 2,607 1,903 Total other comprehensive income/(loss) (400) (86,742) 2,607 (84,535) Income tax expense/(benefit) (84) (18,216) 548 (17,752) Total other comprehensive income/(loss), net of tax (316) (68,526) 2,059 (66,783) Ending balance $ (316) $ (220,090) $ (51,802) $ (272,208) Six Months Ended June 30, 2023 Beginning balance $ (66,394) $ (304,309) $ (48,240) $ (418,943) Change in unrealized gain/(loss) (45,529) (11,249) — (56,778) Amounts reclassified into net income 26,048 — 3,687 29,735 Total other comprehensive income/(loss) (19,481) (11,249) 3,687 (27,043) Income tax expense/(benefit) (4,090) (2,362) 774 (5,678) Total other comprehensive income/(loss), net of tax (15,391) (8,887) 2,913 (21,365) Ending balance $ (81,785) $ (313,196) $ (45,327) $ (440,308) Six Months Ended June 30, 2022 Beginning balance $ — $ (47,715) $ — $ (47,715) Change in unrealized gain/(loss) 304 (218,196) (69,165) (287,057) Amounts reclassified into net income (704) — 3,593 2,889 Total other comprehensive income/(loss) (400) (218,196) (65,572) (284,168) Income tax expense/(benefit) (84) (45,821) (13,770) (59,675) Total other comprehensive income/(loss), net of tax (316) (172,375) (51,802) (224,493) Ending balance $ (316) $ (220,090) $ (51,802) $ (272,208)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net income	$ 68,651	$ 34,159	$ 107,312	$ 73,809
Preferred stock dividends	4,312	4,312	8,625	8,625
Net income available to common stockholders	$ 64,339	$ 29,847	$ 98,687	$ 65,184
Denominator:
Basic earnings per common share—weighted average common shares	47,906,624	50,258,681	48,166,977	50,462,735
Effect of employee stock-based awards	514,652	542,947	569,405	607,034
Dilutive earnings per common share—weighted average diluted common shares	48,421,276	50,801,628	48,736,382	51,069,769
Basic earnings per common share (in usd per share)	$ 1.34	$ 0.59	$ 2.05	$ 1.29
Diluted earnings per common share (in usd per share)	$ 1.33	$ 0.59	$ 2.02	$ 1.28
Anti-dilutive outstanding stock-settled awards	533,363	430,224	341,728	301,842

Investment Securities - Summary

Investment Securities - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 3,688,929	$ 3,000,846
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(396,451)	(385,205)
Estimated Fair Value	3,292,478	2,615,644
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Held-to-maturity debt securities	900,315	935,514
Equity securities at fair value	33,860	33,956
Total investment securities(2)	4,226,653	3,585,114
Interest receivable	105,700	100,400
Available-for-sale Securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	3,688,929
Estimated Fair Value	3,292,478
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Interest receivable	9,500	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	788,435
Interest receivable	1,500	1,500
US Treasury Securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	646,811	698,769
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26,483)	(28,187)
Estimated Fair Value	620,328	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	(21,314)	(22,846)
Estimated Fair Value	103,686	102,154
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	2,902,892	2,162,364
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(346,184)	(331,320)
Estimated Fair Value	2,556,708	1,831,047
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Held-to-maturity debt securities	900,315	935,514
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(111,880)	(118,600)
Estimated Fair Value	788,435	816,914
CRT securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	14,226	14,713
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,470)	(2,852)
Estimated Fair Value	$ 11,756	$ 11,861

Investment Securities - Narrati

Investment Securities - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)	Jun. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of securities in an unrealized loss position		112
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		94
Customer repurchase agreements
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits | $			$ 16,100
Deposits
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits | $		$ 1,600	$ 1,400

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Amortized Cost	$ 3,688,929	$ 3,000,846
Fair Value
Fair Value	3,292,478	$ 2,615,644
Available-for-sale Securities
Amortized Cost
Due within one year	251,079
Due after one year through five years	445,732
Due after five years through ten years	106,187
Due after ten years	2,885,931
Amortized Cost	3,688,929
Fair Value
Due within one year	245,016
Due after one year through five years	418,385
Due after five years through ten years	86,519
Due after ten years	2,542,558
Fair Value	3,292,478
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	900,315
Amortized Cost	900,315
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	788,435
Fair Value	$ 788,435

Investment Securities - Sched_2

Investment Securities - Schedule of Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 1,283,956	$ 932,084
Less Than 12 Months, Unrealized Loss	(36,819)	(37,668)
12 Months or Longer, Fair Value	2,008,522	1,683,122
12 Months or Longer, Unrealized Loss	(359,632)	(347,537)
Total, Fair Value	3,292,478	2,615,206
Total, Unrealized Loss	(396,451)	(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	103,686	102,154
12 Months or Longer, Unrealized Loss	(21,314)	(22,846)
Total, Fair Value	103,686	102,154
Total, Unrealized Loss	(21,314)	(22,846)
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	1,024,801	261,502
Less Than 12 Months, Unrealized Loss	(27,157)	(9,481)
12 Months or Longer, Fair Value	1,531,907	1,569,107
12 Months or Longer, Unrealized Loss	(319,027)	(321,839)
Total, Fair Value	2,556,708	1,830,609
Total, Unrealized Loss	(346,184)	(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	11,756	11,861
12 Months or Longer, Unrealized Loss	(2,470)	(2,852)
Total, Fair Value	11,756	11,861
Total, Unrealized Loss	(2,470)	(2,852)
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	259,155	670,582
Less Than 12 Months, Unrealized Loss	(9,662)	(28,187)
12 Months or Longer, Fair Value	361,173	0
12 Months or Longer, Unrealized Loss	(16,821)	0
Total, Fair Value	620,328	670,582
Total, Unrealized Loss	$ (26,483)	$ (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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Net gains/(losses) recognized during the period	$ 951	$ (4,996)	$ 2,196	$ (8,636)
Less: Realized net gains/(losses) recognized on securities sold	10	204	606	2
Unrealized net gains/(losses) recognized on securities still held	$ 961	$ (4,792)	$ 2,802	$ (8,634)

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Loans Held for Investment by Portfolio Segment (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 21,399,084,000	$ 19,350,920,000
Unearned income (net of direct origination costs)	(73,069,000)	(63,580,000)
Total loans held for investment	21,326,015,000	19,287,340,000
Allowance for credit losses on loans	(237,343,000)	(253,469,000)	$ (229,013,000)	$ (211,866,000)
Loans held for investment, net	21,088,672,000	19,033,871,000
Loans held for sale	29,097,000	36,357,000
Interest receivable	105,700,000	100,400,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,459,640,000	9,832,676,000
Allowance for credit losses on loans	(175,347,000)	(185,303,000)	(142,426,000)	(154,360,000)
Loans held for sale	29,097,000	36,357,000
Mortgage finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,098,812,000	4,090,033,000
Allowance for credit losses on loans	(7,085,000)	(10,745,000)	(19,058,000)	(6,083,000)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,308,997,000	4,875,363,000
Allowance for credit losses on loans	(52,538,000)	(54,268,000)	(64,717,000)	(48,247,000)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	531,635,000	552,848,000
Allowance for credit losses on loans	$ (2,373,000)	$ (3,153,000)	$ (2,812,000)	$ (3,176,000)

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Loans by Investment Grade (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 1,595,746		$ 3,524,436
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,797,640		2,318,862
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2,347,658		1,217,215
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,222,581		1,143,913
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,041,837		1,134,112
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	4,759,581		3,450,576
Revolving lines of credit	6,582,018		6,495,256
Revolving lines of credit converted to term loans	52,023		66,550
Total	21,399,084		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	8,243
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	871
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	29,584	$ 3,328
Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,061,321		2,051,137
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,095,226		757,872
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	474,793		245,404
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	175,936		324,837
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	238,121		355,256
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	399,354		241,653
Revolving lines of credit	5,992,408		5,833,334
Revolving lines of credit converted to term loans	22,481		23,183
Total	10,459,640		9,832,676
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	29,584	2,978
Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,046,010		2,022,950
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,914,964		678,473
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	414,088		240,511
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	173,152		254,985
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	214,029		322,099
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	365,905		227,853
Revolving lines of credit	5,904,419		5,694,352
Revolving lines of credit converted to term loans	18,637		20,933
Total	10,051,204		9,462,156
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	83,010		7,740
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	18,452		3,628
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	289		37,794
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	707		11,998
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	19,303		4,975
Revolving lines of credit	54,371		95,310
Revolving lines of credit converted to term loans	142		2,250
Total	176,369		172,836
Commercial | Substandard - accruing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	15,216		18,670
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	55,176		71,147
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	39,042		514
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2,059		1,666
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		14,933
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	6,725		6,305
Revolving lines of credit	33,457		37,407
Revolving lines of credit converted to term loans	528		0
Total	152,203		150,642
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	42,076		512
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3,211		751
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	436		30,392
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	23,385		6,226
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,421		2,520
Revolving lines of credit	161		6,265
Revolving lines of credit converted to term loans	3,174		0
Total	79,864		47,042
Mortgage finance
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	115,533		30,485
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	54,104		482,477
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	686,673		197,045
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	341,626		267,758
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	358,533		464,753
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	3,542,343		2,647,515
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	5,098,812		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	115,533		30,485
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	54,104		482,477
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	686,673		197,045
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	341,626		267,758
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	358,533		464,753
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	3,542,343		2,647,515
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	5,098,812		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
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	399,524		1,373,494
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,589,409		983,043
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,096,898		717,706
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	649,833		526,512
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	430,703		294,048
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	704,557		471,489
Revolving lines of credit	408,959		465,834
Revolving lines of credit converted to term loans	29,114		43,237
Total	5,308,997		4,875,363
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	350
Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	398,476		1,362,160
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,533,734		958,669
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,056,719		670,113
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	625,786		520,970
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	418,687		263,240
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	634,714		448,536
Revolving lines of credit	408,959		465,834
Revolving lines of credit converted to term loans	23,700		43,237
Total	5,100,775		4,732,759
Commercial real estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,048		3,494
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	55,675		6,524
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	22,329		46,512
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	24,047		5,295
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	12,016		19,350
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	39,960		4,038
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	5,414		0
Total	160,489		85,213
Commercial real estate | Substandard - accruing
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		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		247
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	29,708		18,733
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	47,558		56,128
Commercial real estate | 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		1,081
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	175		182
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	175		1,263
Consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	19,368		69,320
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	58,901		95,470
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	89,294		57,060
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	55,186		24,806
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	14,480		20,055
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	113,327		89,919
Revolving lines of credit	180,651		196,088
Revolving lines of credit converted to term loans	428		130
Total	531,635		552,848
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	$ 0
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	19,368		69,320
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	58,901		95,470
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	89,294		57,060
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	55,186		24,773
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	14,480		20,055
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	110,951		89,919
Revolving lines of credit	180,651		196,088
Revolving lines of credit converted to term loans	107		130
Total	528,938		552,815
Consumer | 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	1,376		0
Revolving lines of credit	0		0
Revolving lines of credit converted to term loans	0		0
Total	1,376		0
Consumer | 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	321		0
Total	321		0
Consumer | 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		33
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		$ 33

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans - Allowance Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 253,469	$ 211,866
Provision for credit losses on loans	12,023	19,284
Charge-offs	29,584	3,328
Recoveries	1,435	1,191
Net charge-offs (recoveries)	28,149	2,137
Ending balance	237,343	229,013
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	185,303	154,360
Provision for credit losses on loans	18,198	(10,128)
Charge-offs	29,584	2,978
Recoveries	1,430	1,172
Net charge-offs (recoveries)	28,154	1,806
Ending balance	175,347	142,426
Mortgage finance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,745	6,083
Provision for credit losses on loans	(3,660)	12,975
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	7,085	19,058
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	54,268	48,247
Provision for credit losses on loans	(1,730)	16,820
Charge-offs	0	350
Recoveries	0	0
Net charge-offs (recoveries)	0	350
Ending balance	52,538	64,717
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,153	3,176
Provision for credit losses on loans	(785)	(383)
Charge-offs	0	0
Recoveries	5	19
Net charge-offs (recoveries)	(5)	(19)
Ending balance	$ 2,373	$ 2,812

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 7,000	$ 22,000	$ 35,000	$ 20,000
Net charge-offs (recoveries)			28,149	2,137
Loan balance	21,399,084		21,399,084		$ 19,350,920
Nonaccrual loans that met the criteria for restructured		17,300		17,300	531
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs (recoveries)			28,154	1,806
Loan balance	10,459,640		10,459,640		9,832,676
Loans subsequently defaulted			161
Commercial | Asset Pledged as Collateral
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan balance	40,400		40,400
Criticized
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan balance	$ 619,400	$ 603,500	619,400	603,500	$ 513,200
Leveraged Lending
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs (recoveries)				2,100
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses			$ 12,000	$ 19,300

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses on Loans - Age Analysis (Details) - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 21,399,084,000		$ 19,350,920,000
Non-accrual	81,039,000
Non-accrual With No Allowance	24,385,000
Non-accrual loans earning interest income on cash basis	1,400,000		2,200,000
Interest income on non-accrual loans	37,000	$ 0
Interest Income Reversed	1,600,000	$ 4,000
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	10,459,640,000		9,832,676,000
Non-accrual	79,864,000
Non-accrual With No Allowance	23,385,000
Mortgage finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,098,812,000		4,090,033,000
Non-accrual	0
Non-accrual With No Allowance	0
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,308,997,000		4,875,363,000
Non-accrual	175,000
Non-accrual With No Allowance	0
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	531,635,000		$ 552,848,000
Non-accrual	1,000,000
Non-accrual With No Allowance	1,000,000
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,808,000
30-59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,273,000
30-59 Days Past Due | Mortgage finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
30-59 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	524,000
30-59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	686,000
60-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	686,000
60-89 Days Past Due | Mortgage finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
60-89 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
60-89 Days Past Due | Consumer
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	64,000
90 Days or More Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	64,000
90 Days or More Past Due | Mortgage finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
90 Days or More Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,558,000
Total Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,023,000
Total Past Due | Mortgage finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0
Total Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	524,000
Total Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,000
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	21,314,487,000
Current | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	10,376,753,000
Current | Mortgage finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,098,812,000
Current | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,308,298,000
Current | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 530,624,000

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) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 3,639	$ 53,594
Percentage of Total Loans Held for Investment	0.02%	0.25%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 0	$ 31,356
Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	261	1,144
Payment Deferral and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	3,378	6,562
Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	0	14,532
Commercial
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 3,639	$ 53,594
Percentage of Total Loans Held for Investment	0.02%	0.25%
Commercial | Payment Deferral
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 0	$ 31,356
Commercial | Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	261	1,144
Commercial | Payment Deferral and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	3,378	6,562
Commercial | Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Total modified in period	$ 0	$ 14,532

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses on Loans - Summary of Financial Impacts of Loan Modifications (Details) - Commercial - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Financing Receivable, Modifications [Line Items]
Interest Rate Reduction	0%	0.70%
Total Payment Deferrals (in thousands)	$ 358	$ 5,080
Minimum
Financing Receivable, Modifications [Line Items]
Term Extension (in months)	4 months	4 months
Maximum
Financing Receivable, Modifications [Line Items]
Term Extension (in months)	12 months	36 months

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	Jun. 30, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Total	$ 53,594
30-89 Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
90+ Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
Non-Accrual
Financing Receivable, Modifications [Line Items]
Total	6,723
Current
Financing Receivable, Modifications [Line Items]
Total	46,871
Commercial
Financing Receivable, Modifications [Line Items]
Total	53,594
Commercial | 30-89 Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
Commercial | 90+ Days Past Due
Financing Receivable, Modifications [Line Items]
Total	0
Commercial | Non-Accrual
Financing Receivable, Modifications [Line Items]
Total	6,723
Commercial | Current
Financing Receivable, Modifications [Line Items]
Total	$ 46,871

Short-Term Borrowings and Lon_3

Short-Term Borrowings and Long-Term Debt - Summary of Short-Term Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Amount outstanding at year-end	$ 1,350,000	$ 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	$ 1,350,000	$ 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	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	May 06, 2021	Jan. 31, 2014
Schedule Of Borrowings [Line Items]
Long-term debt	$ 857,795	$ 857,795		$ 931,442
Repayments of long-term debt		75,000	$ 0
Senior Unsecured Credit-Linked Notes, Due 2024
Schedule Of Borrowings [Line Items]
Senior unsecured credit-linked notes	198,496	198,496		272,492
Repayments of long-term debt	75,000
5.75% Subordinated Notes, Due 2026
Schedule Of Borrowings [Line Items]
Trust preferred securities issued	174,326	174,326		174,196
Interest rate						5.25%
4.00% Subordinated Notes, Due 2031
Schedule Of Borrowings [Line Items]
Trust preferred securities issued	371,567	371,567		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		$ 113,406

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Beginning balance	$ 21,793	$ 17,265
Provision for credit losses	22,977	716
Ending balance	44,770	17,981
Commercial
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Beginning balance	16,550	15,107
Provision for credit losses	17,187	(1,656)
Ending balance	33,737	13,451
Mortgage finance
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Beginning balance	0	0
Provision for credit losses	0	0
Ending balance	0	0
Commercial real estate
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Beginning balance	5,222	2,136
Provision for credit losses	5,693	2,376
Ending balance	10,915	4,512
Consumer
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Beginning balance	21	22
Provision for credit losses	97	(4)
Ending balance	118	$ 18
Commitments to extend credit
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Off-balance sheet liability	9,973,209		$ 9,673,082
Standby letters of credit
Allowance For Off-Balance Sheet Credit Losses [Roll Forward]
Off-balance sheet liability	$ 488,525		$ 417,896

Regulatory Ratios and Capital -

Regulatory Ratios and Capital - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Jan. 18, 2023 USD ($)	Dec. 31, 2022 USD ($)	Apr. 19, 2022 USD ($)	Dec. 31, 2009 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Shares repurchased	$ 50,023	$ 60,218	$ 50,023
Assets		$ 28,976,544			$ 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	Jun. 30, 2023	Dec. 31, 2022
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 3,225,555	$ 3,180,208
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	4,351,950	4,331,098
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,649,204	2,446,583
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	3,635,555	3,590,208
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	1,589,523	1,467,950
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	$ 3,635,555	$ 3,590,208
Risk Based Ratios [Abstract]
CET1, actual ratio	12.18%	13%
Total capital (to risk weighted assets), actual ratio	0.1643	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	0.1372	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	0.1239	0.1154
Bank
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 3,516,575	$ 3,408,178
CET1 to be well capitalized under prompt corrective action provisions, amount	1,717,324	1,587,909
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	4,071,403	3,987,720
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,642,037	2,442,937
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	3,676,575	3,568,178
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,113,630	1,954,349
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	3,676,575	3,568,178
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, amount	$ 1,464,288	$ 1,554,039
Risk Based Ratios [Abstract]
CET1, actual ratio	13.31%	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	0.1541	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	0.1392	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	0.1255	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	$ 1,854,443	$ 1,712,608
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,781,665	2,568,912
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,251,824	2,079,595
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,173,583	$ 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	$ 1,849,426	$ 1,710,056
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	2,774,139	2,565,083
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,245,731	2,076,496
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,171,431	$ 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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled awards:	$ 5,069	$ 5,024	$ 13,507	$ 10,612
Unrecognized compensation expense related to unvested stock-settled awards	40,155		$ 40,155
Weighted average period over which expense is expected to be recognized, in years			2 years 3 months 18 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled awards:	5,069	5,022	$ 13,507	10,429
Cash-settled units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled awards:	$ 0	$ 2	$ 0	$ 183

Fair Value Disclosures - Schedu

Fair Value Disclosures - Schedule of Assets and Liabilities Measured At Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 3,292,478	$ 2,615,644
Equity securities	33,860	33,956
Derivative assets	10,768	13,504
Derivative liabilities	97,909	91,758
US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	620,328	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	103,686	102,154
CRT securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	11,756	11,861
Fair value measurements, recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	22,783	22,879
Derivative assets	0	0
Derivative liabilities	0	0
Non-qualified deferred compensation plan liabilities	21,149	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	620,328	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	11,077	11,077
Derivative assets	10,768	13,504
Derivative liabilities	97,909	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	103,686	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	2,556,708	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	11,756	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	$ 26,047	$ 0

Fair Value Disclosures - Level

Fair Value Disclosures - Level 3 Fair Value Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period		$ 8,085		$ 7,658
Purchases / Additions		0		1,327
Sales / Reductions		(4,029)		(4,600)
Realized		0		0
Unrealized		210		(119)
Balance at End of Period		4,266		$ 4,266
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		165,845		$ 180,033
Purchases / Additions		0		0
Sales / Reductions		(166,890)		(170,626)
Realized		0		0
Unrealized		1,045		(9,407)
Balance at End of Period		0		$ 0
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	$ 11,928	11,901	$ 11,861	$ 11,846
Purchases / Additions	0	0	0	0
Sales / Reductions	0	0	0	0
Realized	0	0	0	0
Unrealized	(172)	(231)	(105)	(176)
Balance at End of Period	$ 11,756	$ 11,670	$ 11,756	$ 11,670
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
	Jun. 30, 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	$ 26,047	$ 0
Impaired loans, carrying value	40,400
Allowance allocations	$ 14,300
CRT securities | Minimum
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Debt securities, available-for-sale, term	4 years 9 months 29 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 2 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	0.0625
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	0.0801	0.0824
Debt securities, available-for-sale, term	5 years 11 months 23 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	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	$ 3,292,478	$ 2,615,644
Held-to-maturity debt securities	900,315	935,514
Equity securities	33,860	33,956
Derivative assets	10,768	13,504
Long-term debt	857,795	931,442
Derivative liabilities	97,909	91,758
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,847,445	5,012,260
Available-for-sale debt securities	3,292,478	2,615,644
Held-to-maturity debt securities	900,315	935,514
Equity securities	33,860	33,956
Loans held for sale	29,097	36,357
Loans held for investment, net	21,088,672	19,033,871
Derivative assets	10,768	13,504
Total deposits	23,318,240	22,856,880
Short-term borrowings	1,350,000	1,201,142
Long-term debt	857,795	931,442
Derivative liabilities	97,909	91,758
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,847,445	5,012,260
Available-for-sale debt securities	3,292,478	2,615,644
Held-to-maturity debt securities	788,435	816,914
Equity securities	33,860	33,956
Loans held for sale	29,097	36,357
Loans held for investment, net	21,016,413	18,969,922
Derivative assets	10,768	13,504
Total deposits	23,497,477	22,857,949
Short-term borrowings	1,350,000	1,201,142
Long-term debt	768,222	881,716
Derivative liabilities	97,909	91,758
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,847,445	5,012,260
Available-for-sale debt securities	620,328	670,582
Equity securities	22,783	22,879
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	2,660,394	1,933,201
Held-to-maturity debt securities	788,435	816,914
Equity securities	11,077	11,077
Loans held for sale	29,097	0
Derivative assets	10,768	13,504
Short-term borrowings	1,350,000	1,201,142
Long-term debt	768,222	881,716
Derivative liabilities	97,909	91,758
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale debt securities	11,756	11,861
Loans held for sale	0	36,357
Loans held for investment, net	21,016,413	18,969,922
Total deposits	$ 23,497,477	$ 22,857,949

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Estimated fair value, asset derivative	$ 108,958	$ 90,543
Estimated fair value, liability derivative	216,505	176,543
Offsetting derivative liabilities	(26,524)	(5,164)
Offsetting derivative assets	(26,524)	(5,164)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	(71,666)	(71,875)
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	(92,072)	(79,621)
Net asset derivatives included in the consolidated balance sheets	10,768	13,504
Net liability derivatives included in the consolidated balance sheets	$ 97,909	$ 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	0	0
Estimated fair value, liability derivative	108,292	86,378
Non-hedging derivatives | Swaps | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	5,036,185	4,396,367
Estimated fair value, asset derivative	87,403	83,529
Estimated fair value, liability derivative	87,377	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	38	0
Estimated fair value, liability derivative	24	0
Non-hedging derivatives | Caps and floors written | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	1,251,159	220,142
Estimated fair value, asset derivative	2,661	0
Estimated fair value, liability derivative	4,636	2,583
Non-hedging derivatives | Caps and floors purchased | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	1,251,159	220,142
Estimated fair value, asset derivative	4,636	2,583
Estimated fair value, liability derivative	2,661	0
Non-hedging derivatives | Forward contracts | Customer-Initiated and Other Derivatives
Derivative [Line Items]
Residential MSRs, notional amount	7,274,246	1,569,326
Estimated fair value, asset derivative	14,220	4,431
Estimated fair value, liability derivative	$ 13,515	$ 4,053

Derivative Financial Instrume_4

Derivative Financial Instruments Derivative Financial Instruments - Narrative (Details)	6 Months Ended
	Jun. 30, 2023 USD ($) instrument	Dec. 31, 2022 USD ($) instrument
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 156,900,000	$ 89,200,000
CashCollateralPostedForDerivativesInLiabilityPosition	$ 74,500,000	$ 72,500,000
Risk participation agreement - participant bank
Derivative [Line Items]
Instruments held | instrument	17	19
Non-hedging derivatives, notional amoount	$ 328,200,000	$ 291,200,000
Maximum exposure	$ 9,000,000	$ 8,900,000
Risk participation agreement - lead bank
Derivative [Line Items]
Instruments held | instrument	12	18
Non-hedging derivatives, notional amoount	$ 166,500,000	$ 222,000,000
Interest rate contract
Derivative [Line Items]
Unrealized losses, net of tax to AOCI	45,500,000
Amount reclassified from AOCI into interest income on loans	26,000,000
Amount reclassified from AOCI as a decrease to interest income	$ 68,900,000
Maximum period to hedge forecasted transactions	3 years 3 months
Loans Receivable | Not Designated as Hedging Instrument
Derivative [Line Items]
Credit risk exposure, net of collateral pledged, relating to derivatives	$ 10,800,000	$ 13,500,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 3,079,974	$ 3,090,038	$ 3,055,351	$ 3,209,616
Change in unrealized gain/(loss)	(99,731)	(86,438)	(56,778)	(287,057)
Amounts reclassified into net income	16,762	1,903	29,735	2,889
Other comprehensive income/(loss)	(82,969)	(84,535)	(27,043)	(284,168)
Income tax expense/(benefit)	(17,423)	(17,752)	(5,678)	(59,675)
Other comprehensive income/(loss), net of tax	(65,546)	(66,783)	(21,365)	(224,493)
Ending balance	3,081,927	3,006,832	3,081,927	3,006,832
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(46,916)	0	(66,394)	0
Change in unrealized gain/(loss)	(59,057)	304	(45,529)	304
Amounts reclassified into net income	14,919	(704)	26,048	(704)
Other comprehensive income/(loss)	(44,138)	(400)	(19,481)	(400)
Income tax expense/(benefit)	(9,269)	(84)	(4,090)	(84)
Other comprehensive income/(loss), net of tax	(34,869)	(316)	(15,391)	(316)
Ending balance	(81,785)	(316)	(81,785)	(316)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(281,063)	(151,564)	(304,309)	(47,715)
Change in unrealized gain/(loss)	(40,674)	(86,742)	(11,249)	(218,196)
Amounts reclassified into net income	0	0	0	0
Other comprehensive income/(loss)	(40,674)	(86,742)	(11,249)	(218,196)
Income tax expense/(benefit)	(8,541)	(18,216)	(2,362)	(45,821)
Other comprehensive income/(loss), net of tax	(32,133)	(68,526)	(8,887)	(172,375)
Ending balance	(313,196)	(220,090)	(313,196)	(220,090)
AOCI, Accumulated Gain (Loss), Debt Securities, Held-to-Maturity, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(46,783)	(53,861)	(48,240)	0
Change in unrealized gain/(loss)	0	0	0	(69,165)
Amounts reclassified into net income	1,843	2,607	3,687	3,593
Other comprehensive income/(loss)	1,843	2,607	3,687	(65,572)
Income tax expense/(benefit)	387	548	774	(13,770)
Other comprehensive income/(loss), net of tax	1,456	2,059	2,913	(51,802)
Ending balance	(45,327)	(51,802)	(45,327)	(51,802)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(374,762)	(205,425)	(418,943)	(47,715)
Ending balance	$ (440,308)	$ (272,208)	$ (440,308)	$ (272,208)