Prosperity Bancshares (PB) 10-K 24 Feb 23 2022 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Feb. 21, 2023	Jun. 30, 2022
Cover [Abstract]
Entity Registrant Name	PROSPERITY BANCSHARES, INC.
Entity Central Index Key	0001068851
Trading Symbol	PB
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding (in shares)		91,308,615
Entity Public Float			$ 5,960
Entity File Number	001-35388
Entity Tax Identification Number	74-2331986
Entity Address, Address Line One	Prosperity Bank Plaza
Entity Address, Address Line Two	4295 San Felipe
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77027
City Area Code	281
Local Phone Number	269-7199
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock, par value $1.00 per share
Security Exchange Name	NYSE
Entity Incorporation, State or Country Code	TX
Document Annual Report	true
Document Transition Report	false
Auditor Name	Deloitte and Touche LLP
Auditor Location	Houston, Texas
Auditor Firm ID	34
Documents Incorporated by Reference	Documents Incorporated by Reference: Portions of the Company’s Proxy Statement relating to the 2023 Annual Meeting of Shareholders, which will be filed within 120 days after December 31, 2022, are incorporated by reference into Part III, Items 10-14 of this Annual Report on Form 10-K.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
ASSETS
Cash and due from banks	$ 423,832	$ 2,547,739
Federal funds sold	301	241
Total cash and cash equivalents	424,133	2,547,980
Available for sale securities, at fair value	456,502	514,932
Held to maturity securities, at cost (fair value of $12,387,125 and $12,251,213 respectively)	14,019,503	12,303,969
Total securities	14,476,005	12,818,901
Loans held for sale	554	7,274
Loans held for investment	18,098,653	16,833,171
Loans held for investment - Warehouse Purchase Program	740,620	1,775,699
Total loans	18,839,827	18,616,144
Less: allowance for credit losses on loans	(281,576)	(286,380)
Loans, net	18,558,251	18,329,764
Accrued interest receivable	88,438	66,030
Goodwill	3,231,636	3,231,636
Core deposit intangibles, net	51,348	61,684
Bank premises and equipment, net	339,453	319,799
Other real estate owned	1,963	622
Bank owned life insurance (BOLI)	327,439	327,149
Federal Home Loan Bank of Dallas stock	90,025	8,901
Other assets	101,138	121,504
TOTAL ASSETS	37,689,829	37,833,970
Deposits:
Noninterest-bearing	10,915,448	10,750,034
Interest-bearing	17,618,083	20,021,728
Total deposits	28,533,531	30,771,762
Other borrowings	1,850,000
Securities sold under repurchase agreements	428,134	448,099
Accrued interest payable	4,495	1,261
Allowance for credit losses on off-balance sheet credit exposures	29,947	29,947
Other liabilities	144,348	155,665
Total liabilities	30,990,455	31,406,734
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS’ EQUITY:
Preferred stock, $1 par value; 20,000,000 shares authorized; none issued or outstanding
Common stock, $1 par value; 200,000,000 shares authorized; 91,313,615 shares issued and outstanding at December 31, 2022; 92,170,480 shares issued and outstanding at December 31, 2021	91,314	92,171
Capital surplus	3,541,924	3,595,023
Retained earnings	3,069,609	2,738,233
Accumulated other comprehensive (loss) income - net unrealized gain on available for sale securities, net of tax (benefit) expense of $(923) and $481, respectively	(3,473)	1,809
Total shareholders’ equity	6,699,374	6,427,236
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	37,689,829	37,833,970
Warehouse Purchase Program [Member]
ASSETS
Loans held for investment	740,620	1,775,699
Total loans	740,620	$ 1,775,699
Loans, net	$ 740,600

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Held to maturity securities, fair value	$ 12,387,125	$ 12,251,213
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	91,313,615	92,170,480
Common stock, shares outstanding (in shares)	91,313,615	92,170,480
Accumulated other comprehensive (loss) income net unrealized gain on available for sale securities, tax (benefit) expense	$ (923)	$ 481

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME:
Loans, including fees	$ 831,189	$ 869,908	$ 975,895
Securities	260,416	175,459	166,812
Federal funds sold and other earning assets	3,230	1,556	1,203
Total interest income	1,094,835	1,046,923	1,143,910
INTEREST EXPENSE:
Deposits	68,112	52,913	102,502
Other borrowings	18,851		3,550
Securities sold under repurchase agreements	2,641	702	1,627
Subordinated notes			5,498
Total interest expense	89,604	53,615	113,177
NET INTEREST INCOME	1,005,231	993,308	1,030,733
PROVISION FOR CREDIT LOSSES			20,000
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	1,005,231	993,308	1,010,733
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees	34,014	29,610	30,295
Credit card, debit card and ATM card income	34,764	34,680	31,245
Service charges on deposit accounts	24,730	24,392	23,860
Trust income	12,250	10,278	9,598
Mortgage income	1,399	8,302	10,777
Brokerage income	3,654	3,320	2,504
Net gain (loss) on sale or write down of assets	3,934	1,097	(5,533)
Other	30,383	28,287	28,788
Total noninterest income	145,128	139,966	131,534
NONINTEREST EXPENSE:
Salaries and employee benefits	314,713	310,556	309,268
Net occupancy and equipment	32,446	32,184	35,037
Credit and debit card, data processing and software amortization	37,327	35,104	40,329
Regulatory assessments and FDIC insurance	11,381	10,638	9,861
Core deposit intangibles amortization	10,336	11,551	13,169
Depreciation	17,960	18,095	18,232
Communications	13,005	12,028	12,477
Net other real estate (income) expense	(122)	(2,224)	165
Merger related expenses	272		8,018
Other	46,868	45,688	50,677
Total noninterest expense	484,186	473,620	497,233
INCOME BEFORE INCOME TAXES	666,173	659,654	645,034
PROVISION FOR INCOME TAXES	141,657	140,357	116,130
NET INCOME	$ 524,516	$ 519,297	$ 528,904
EARNINGS PER SHARE:
Basic	$ 5.73	$ 5.60	$ 5.68
Diluted	$ 5.73	$ 5.60	$ 5.68

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 524,516	$ 519,297	$ 528,904
Securities available for sale:
Change in unrealized (losses) gains during the period	(6,686)	1,316	212
Total other comprehensive (loss) income	(6,686)	1,316	212
Deferred tax benefit (expense) related to other comprehensive (loss) income	1,404	(276)	(45)
Other comprehensive (loss) income, net of tax	(5,282)	1,040	167
Comprehensive income	$ 519,234	$ 520,337	$ 529,071

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	[1]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock [Member]	Common Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Capital Surplus [Member]	Capital Surplus [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	[1]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
BALANCE at Dec. 31, 2019	$ 5,970,835	$ (92,860)		$ 5,877,975	$ 94,746	$ 94,746	$ 3,734,519	$ 3,734,519	$ 2,140,968	$ (92,860)		$ 2,048,108	$ 602	$ 602
BALANCE (in shares) at Dec. 31, 2019					94,746,019	94,746,019
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]								Accounting Standards Update 2016-13 [Member]
Net income	$ 528,904								$ 528,904
Other comprehensive income (loss)	167												167
Common stock issued in connection with the granting of restricted stock awards, net					$ 18		(18)
Common stock issued in connection with the granting of restricted stock awards, net (in shares)					18,231
Common stock repurchase	(115,161)				$ (2,193)		(112,968)
Common stock repurchase (in shares)					(2,193,461)
Stock based compensation expense	12,607						12,607
Cash dividends declared	(173,823)								(173,823)
BALANCE at Dec. 31, 2020	6,130,669				$ 92,571		3,634,140		2,403,189				769
BALANCE (in shares) at Dec. 31, 2020					92,570,789
Net income	519,297								519,297
Other comprehensive income (loss)	1,040												1,040
Common stock issued in connection with the granting of restricted stock awards, net					$ 367		(367)
Common stock issued in connection with the granting of restricted stock awards, net (in shares)					366,825
Common stock repurchase	(52,089)				$ (767)		(51,322)
Common stock repurchase (in shares)					(767,134)
Stock based compensation expense	12,572						12,572
Cash dividends declared	(184,253)								(184,253)
BALANCE at Dec. 31, 2021	6,427,236				$ 92,171		3,595,023		2,738,233				1,809
BALANCE (in shares) at Dec. 31, 2021					92,170,480
Net income	524,516								524,516
Other comprehensive income (loss)	(5,282)												(5,282)
Common stock issued in connection with the granting of restricted stock awards, net					$ 125		(125)
Common stock issued in connection with the granting of restricted stock awards, net (in shares)					125,019
Common stock repurchase	(65,721)				$ (982)		(64,739)
Common stock repurchase (in shares)					(981,884)
Stock based compensation expense	11,765						11,765
Cash dividends declared	(193,140)								(193,140)
BALANCE at Dec. 31, 2022	$ 6,699,374				$ 91,314		$ 3,541,924		$ 3,069,609				$ (3,473)
BALANCE (in shares) at Dec. 31, 2022					91,313,615
[1] ASU 2016-13 became effective for the Company on January 1, 2020.

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retained Earnings [Member]
Cash dividend declared, per share (in dollars per share)	$ 2.11	$ 1.99	$ 1.87

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 524,516	$ 519,297	$ 528,904
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization	28,296	29,646	31,401
Provision for credit losses			20,000
Deferred income tax expense (benefit)	6,046	22,829	24,816
Net amortization of premium on investments	42,957	58,427	38,827
(Gain) loss on sale or write down of premises, equipment, other assets and other real estate	(4,817)	(3,816)	5,075
Net amortization of premium on deposits	(311)	(1,162)	(6,093)
Net accretion of discount on loans	(7,401)	(39,278)	(91,341)
Proceeds from sale of loans held for sale	57,488	249,539	462,750
Originations of loans held for sale	(50,768)	(212,638)	(429,662)
Stock based compensation expense	11,765	12,572	12,607
(Increase) decrease in accrued interest receivable and other assets	(85,209)	61,326	29,112
Decrease in accrued interest payable and other liabilities	(16,036)	(2,014)	(44,075)
Net cash provided by operating activities	506,526	694,728	582,321
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities	2,162,893	2,844,242	2,454,086
Purchase of held to maturity securities	(3,922,086)	(7,315,419)	(2,101,683)
Proceeds from maturities, sales and principal paydowns of available for sale securities	17,332,961	16,437,990	15,047,469
Purchase of available for sale securities	(17,280,514)	(16,300,005)	(15,411,251)
Originations of Warehouse Purchase Program loans	(19,072,964)	(36,019,746)	(43,293,619)
Proceeds from pay-offs of Warehouse Purchase Program loans	20,108,043	37,086,426	42,004,002
Net (increase) decrease in loans held for investment	(1,265,391)	529,672	29,758
Purchase of bank premises and equipment	(42,421)	(19,022)	(22,143)
Proceeds from sale of bank premises, equipment and other real estate	10,074	24,178	13,910
Proceeds from insurance claims	5,778	6,781	5,163
Net cash used in investing activities	(1,963,627)	(2,724,903)	(1,274,308)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in noninterest-bearing deposits	165,414	1,598,801	1,387,339
Net (decrease) increase in interest-bearing deposits	(2,403,334)	1,813,631	1,779,514
Net proceeds (repayments) from other short-term borrowings	1,850,000		(1,300,000)
Repayments of other long-term borrowings			(3,730)
Net (decrease) increase in securities sold under repurchase agreements	(19,965)	58,516	12,289
Redemption of subordinated notes			(125,000)
Repurchase of common stock	(65,721)	(52,089)	(115,161)
Payments of cash dividends	(193,140)	(184,253)	(173,823)
Net cash (used in) provided by financing activities	(666,746)	3,234,606	1,461,428
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(2,123,847)	1,204,431	769,441
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,547,980	1,343,549	574,108
CASH AND CASH EQUIVALENTS, END OF PERIOD	424,133	2,547,980	1,343,549
NONCASH ACTIVITIES:
Acquisition of real estate through foreclosure of collateral	2,424	6,678	15,964
SUPPLEMENTAL INFORMATION:
Income taxes paid	131,372	126,919	163,597
Interest paid	$ 86,370	$ 55,816	$ 118,300

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting and Reporting Policies	12 Months Ended
	Dec. 31, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations and Summary of Significant Accounting and Reporting Policies	1. NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES Nature of Operations —Prosperity Bancshares, Inc. ® (“Bancshares”) and its subsidiary, Prosperity Bank ® (the “Bank”, collectively referred to as the “Company”), provide retail and commercial banking services. As of December 31, 2022 , the Bank operated 272 full-service banking locations: 65 in the Houston area, including The Woodlands; 30 in the South Texas area including Corpus Christi and Victoria; 62 in the Dallas/Fort Worth, Texas area; 22 in the East Texas area; 29 in the Central Texas area, including Austin and San Antonio; 34 in the West Texas area, including Lubbock, Midland-Odessa and Abilene; 16 in the Bryan/College Station area; 6 in the Central Oklahoma area; and 8 in the Tulsa, Oklahoma area. Summary of Significant Accounting and Reporting Policies —The accounting and reporting policies of the Company conform to generally accepted accounting principles (“GAAP”) and the prevailing practices within the financial services industry. A summary of significant accounting and reporting policies are as follows: Basis of Presentation —The consolidated financial statements include the accounts of Bancshares and its subsidiaries. Intercompany transactions have been eliminated in consolidation. Operations are managed and financial performance is evaluated on a company-wide basis. Accordingly, all of the Company’s banking operations are considered by management to be aggregated in one reportable operating segment. Because the overall banking operations comprise the vast majority of the consolidated operations, no separate segment disclosures are presented. Use of Estimates —The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Such estimates include, but are not limited to certain fair value measures including the calculation of stock-based compensation, the valuation of goodwill and available for sale and held to maturity securities and the calculation of allowance for credit losses. Actual results could differ from these estimates. Business Combinations — Generally, acquisitions are accounted for under the acquisition method of accounting in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 805, Business Combinations. A business combination occurs when the Company acquires net assets that constitute a business and obtains control over that business. Business combinations are effected through the transfer of consideration consisting of cash and/or common stock and are accounted for using the acquisition method. Accordingly, the assets and liabilities of the acquired business are recorded at their respective fair values at the acquisition date. Determining the fair value of assets and liabilities, especially the loan portfolio, is a process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. Fair values are subject to refinement for up to one year after the closing date of the acquisition as information relative to closing date fair values becomes available. The results of operations of an acquired entity are included in the Company’s consolidated results from acquisition date, and prior periods are not restated. Securities —The investment securities portfolio is measured for expected credit losses by segregating the portfolio into two general segments and applying the appropriate expected credit losses methodology. Investment securities classified as available for sale or held to maturity are evaluated for expected credit losses under FASB ASC 326, “ Financial Instruments – Credit Losses .” Securities held to maturity are carried at cost, adjusted for the amortization of premiums and the accretion of discounts. Management has the positive intent and the Company has the ability to hold these assets until their estimated maturities. Securities available for sale are carried at fair value. Unrealized gains and losses are excluded from earnings and reported, net of tax, as a separate component of shareholders’ equity until realized. Securities within the available for sale portfolio may be used as part of the Company’s asset/liability strategy and may be sold in response to changes in interest rate risk, prepayment risk or other similar economic factors. For available for sale securities in an unrealized loss position, the amount of the expected credit losses recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the expected credit losses will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the expected credit losses will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total expected credit losses related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis, and such difference is recognized in earnings. The amount of the total expected credit losses related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the expected credit losses recognized in earnings will become the new amortized cost basis of the investment. Premiums and discounts are amortized and accreted to operations using the level-yield method of accounting, adjusted for prepayments as applicable. The specific identification method of accounting is used to compute gains or losses on the sales of these assets. Interest earned on these assets is included in interest income. Loans Held for Sale —Loans held for sale are carried at the lower of cost or market value. Premiums, discounts and loan fees (net of certain direct loan origination costs) on loans held for sale are deferred until the related loans are sold or repaid. Gains or losses on loan sales are recognized at the time of sale and determined using the specific identification method. Loans Held for Investment —Loans originated and held for investment are stated at the principal amount outstanding, net of unearned fees. The related interest income for multi-payment loans is recognized principally by the simple interest method; for single payment loans, such income is recognized using the straight-line method. The Company has two general categories of loans in its portfolio. Loans originated by the Bank and made pursuant to the Company’s loan policy and procedures in effect at the time the loan was made are referred to as “originated loans” and loans acquired in a business combination are referred to as “acquired loans.” Acquired loans are initially recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected default rates, loss given default and recovery rates, with no carryover of any existing allowance for credit losses. Those acquired loans that are renewed or substantially modified after the date of the business combination are referred to as “re-underwritten acquired loans.” Modifications are reviewed for determination of troubled debt restructuring status independently of this process. In certain instances, acquired loans to one borrower may be combined or otherwise re-originated such that they are re-categorized as originated loans. Acquired loans with a fair value discount or premium at the date of the business combination that remained at the reporting date are referred to as “fair-valued acquired loans.” All fair-valued acquired loans are further categorized into “Non-PCD loans” and “PCD loans” (purchased credit deteriorated loans). Acquired loans with evidence of more than insignificant credit quality deterioration as of the acquisition date when compared to the origination date are classified as PCD loans. The Company estimates the total cash flows expected to be collected from the PCD loans, which include undiscounted expected principal and interest, using credit risk, interest rate and prepayment risk assessments that incorporate management’s best estimate of current key assumptions such as default rates, loss severity and payment speeds. The excess of the undiscounted total cash flows expected to be collected over the fair value of the related PCD loans represents the accretable yield, which is recognized as interest income based on future cash flows, taking into account contractual maturities. The difference between the undiscounted contractual principal and interest and the undiscounted total cash flows expected to be collected is the PCD specific reserve, which is included in the allowance for credit losses. Subsequent increases in expected cash flows will result in a recovery of any previously recorded allowance for credit losses, to the extent applicable. Subsequent decreases in expected cash flows will result in an impairment charge to the provision for credit losses, resulting in an addition to the allowance for credit losses. A loan disposal, which may include a loan sale, receipt of payment in full from the borrower or foreclosure, results in removal of the loan from the balance sheet at its allocated carrying amount and accretion of any remaining fair value discount to income. Warehouse Purchase Program Loans —All Warehouse Purchase Program loans are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. These safeguards include the requirement that the mortgage originator clients have a takeout commitment or similar arrangement for each loan. To date, the Company has not experienced a loss on these loans and no allowance for credit losses has been allocated to them. Nonrefundable Fees and Costs Associated with Lending Activities —Loan origination fees in excess of the associated costs are recognized over the life of the related loan as an adjustment to yield using the interest method. Loan commitment fees and loan origination costs are deferred and recognized as an adjustment of yield by the interest method over the related loan life or, if the commitment expires unexercised, recognized in income upon expiration of the commitment. Nonperforming and Past Due Loans — Included in the nonperforming loan category are loans which have been categorized by management as nonaccrual because collection of interest is doubtful and loans which have been restructured through a troubled debt restructuring to provide a reduction in the interest rate or a deferral of interest or principal payments. The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases, unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan. If the decision is made to continue accruing interest on the loan, periodic reviews are made to confirm the accruing status of the loan. When a loan is placed on nonaccrual status, interest accrued but not yet collected prior to the determination as uncollectible is charged to operations. Interest accrued during prior periods is charged to the allowance for credit losses. Any payments received on nonaccrual loans are applied first to outstanding principal of the loan amount, next to the recovery of charged-off loan amounts and finally, any excess is treated as recovery of lost interest. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured, which is typically evidenced by a sustained period (at least six months) of repayment performance by the borrower. Restructured loans are those loans on which concessions in terms have been granted because of a borrower’s financial difficulty. Interest is generally not accrued on such loans in accordance with the new terms. Allowance for Credit Losses — The allowance for credit losses is accounted for in accordance with ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments” (“CECL”) which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss methodology. CECL requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is an allowance available for losses on loans and held-to-maturity securities. All losses are charged to the allowance when the loss actually occurs or when a determination is made that such a loss is likely and can be reasonably estimated. Recoveries are credited to the allowance at the time of recovery. Throughout the year, management estimates the level of lifetime losses to determine whether the allowance for credit losses is adequate to absorb losses in the loan portfolio. Based on these estimates, an amount is charged to the provision for credit losses and credited to the allowance for credit losses in order to adjust the allowance to a level determined to be adequate to absorb losses. In making its evaluation, management considers factors such as historical lifetime loan loss experience, the amount of nonperforming assets and related collateral, the volume, growth and composition of the portfolio, current economic conditions and reasonable and supportable forecasted economic conditions that may affect borrower ability to pay and the value of collateral, the evaluation of the portfolio through its internal loan review process and other relevant factors. Estimates of credit losses involve an exercise of judgment. While it is possible that in the short term the Company may sustain losses which are substantial in relation to the allowance for credit losses, it is the judgment of management that the allowance for credit losses reflected in the consolidated balance sheets is adequate to absorb expected lifetime losses that may be realized from the loan portfolio as of December 31, 2022. The Company’s allowance for credit losses consists of two elements: (1) specific valuation allowances based on expected losses on impaired loans and PCD loans; and (2) a general valuation allowance based on historical lifetime loan loss experience, current economic conditions, reasonable and supportable forecasted economic conditions, and other qualitative risk factors both internal and external to the Company. Non-PCD loans that have deteriorated to an impaired status subsequent to acquisition are evaluated for a specific reserve on a quarterly basis which, when identified, is added to the allowance for credit losses. The Company reviews impaired Non-PCD loans on a loan-by-loan basis and determines the specific reserve based on the difference between the recorded investment in the loan and one of three factors: expected future cash flows, observable market price or fair value of the collateral. Because essentially all of the Company’s impaired Non-PCD loans have been collateral-dependent, the amount of the specific reserve historically has been determined by comparing the fair value of the collateral securing the Non-PCD loan with the recorded investment in such loan. In the future, the Company will continue to analyze impaired Non-PCD loans on a loan-by-loan basis and may use an alternative measurement method to determine the specific reserve, as appropriate and in accordance with applicable accounting standards. PCD loans are individually monitored on a quarterly basis to assess for changes in expected cash flows subsequent to acquisition. If a deterioration in cash flows is identified, an increase to the specific reserve for that loan is made. PCD loans were recorded at their acquisition date fair values, which were based on expected cash flows and considers estimates of expected future credit losses. The Company’s estimates of loan fair values at the acquisition date may be adjusted for a period of up to one year as the Company continues to evaluate its estimate of expected future cash flows at the acquisition date. If the Company determines that losses arose after the acquisition date, the additional losses will be reflected as a provision for credit losses. Accounting for Acquired Loans and the Allowance for Acquired Credit Losses — The Company accounts for its acquisitions using the acquisition method of accounting. Accordingly, the assets, including loans, and liabilities of the acquired entity were recorded at their fair values at the acquisition date. These fair value estimates associated with acquired loans, and based on a discounted cash flow model, include estimates related to market interest rates and undiscounted projections of future cash flows that incorporate expectations of prepayments and the amount and timing of principal, interest and other cash flows, as well as any shortfalls thereof. For further discussion of the Company’s acquisition and loan accounting, see Note 5 to the consolidated financial statements. Allowance for Credit Losses on Off-Balance Sheet Credit Exposures — The allowance for credit losses on off-balance sheet credit exposures estimates expected credit losses over the contractual period in which there is exposure to credit risk via a contractual obligation to extend credit, except when an obligation is unconditionally cancellable by the Company. The allowance is adjusted by provisions for credit losses charged to earnings that increase the allowance, or by provision releases returned to earnings that decrease the allowance. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on the commitments expected to fund. The estimate of commitments expected to fund is affected by historical analysis of utilization rates. The expected credit loss rates applied to the commitments expected to fund are affected by the general valuation allowance utilized for outstanding balances with the same underlying assumptions and drivers. Premises and Equipment —Premises and equipment are carried at cost less accumulated depreciation. Depreciation expense is computed principally using the straight-line method over the estimated useful lives of the assets which range from one to 39 years . Leasehold improvements are amortized using the straight-line method over the periods of the leases or the estimated useful lives, whichever is shorter. Derivative Financial Instruments —The Company has interest rate swaps with certain commercial customers who wished to obtain a loan at a fixed rate. The Company enters into an interest rate swap with the customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each swap transaction, the Company agrees to pay interest to the borrowing customer on a notional amount at a variable interest rate and receives interest from the customer on the same notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows the customer to effectively convert a variable-rate loan to a fixed-rate. Because the Company acts solely as an intermediary for its customer, changes in the fair value of the underlying derivative contracts offset each other and do not significantly impact the Company’s results of operations. The Company has interest rate lock commitments and forward mortgage-backed securities trades. In the normal course of business, the Company enters into interest rate lock commitments with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. The Company manages the changes in fair value associated with changes in interest rates related to interest rate lock commitments by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the interest rate lock commitment is made. These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers’ financing needs. All derivatives are carried at fair value in either other assets or other liabilities. Goodwill —Goodwill is annually assessed for impairment or when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. Under ASC Topic 350-20, “Intangibles—Goodwill and Other—Goodwill” companies have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining the need to perform step one of the annual test for goodwill impairment. An entity has an unconditional option to bypass the qualitative assessment described in the following paragraph for any reporting unit in any period and proceed directly to performing the first step of the goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. If the estimated fair value of the reporting unit exceeds its carrying value, goodwill of the reporting unit is not impaired. Amortization of Core Deposit Intangibles —Core deposit intangibles are being amortized on a non-pro rata basis over an estimated life of 10 to 15 years . Income Taxes — The Company files a consolidated federal income tax return and consolidated state returns in Oklahoma, Colorado, New Mexico and New York. For the year ended December 31, 2022, the Bank will also file state returns in Arkansas, Florida, Georgia, Idaho, Pennsylvania, Tennessee and Washington. In addition, the Company files a Combined Texas Franchise Tax Report. Deferred tax assets and liabilities are recognized for the estimated tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and are recorded net to other assets on the Company’s consolidated balance sheets. The Company records uncertain tax positions in accordance with ASC Topic 740 “ Income Taxes ” on the basis of a two-step process whereby (1) the Company determines whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. Realization of net deferred tax assets is based upon the level of historical income and on estimates of future taxable income. Although realization is not assured, management believes it is more likely than not that all of the net deferred tax assets will be realized. Stock-Based Compensation —The Company accounts for stock-based employee compensation plans using the fair value-based method of accounting. The expense associated with stock-based compensation is recognized over the vesting period of each individual arrangement. The fair value of restricted stock awards is based on the current market price on the date of grant. Cash and Cash Equivalents —For purposes of reporting cash flows, cash and cash equivalents include cash and due from banks as well as federal funds sold that mature in three days or less. Earnings Per Common Share —Basic earnings per common share are calculated using the two-class method. The two-class method provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of basic earnings per share. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock using the treasury stock method. The following table illustrates the computation of basic and diluted earnings per share: Year Ended December 31, 2022 2021 2020 Amount Per Share Amount Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 524,516 $ 519,297 $ 528,904 Basic: Weighted average shares outstanding 91,604 $ 5.73 92,657 $ 5.60 93,058 $ 5.68 Diluted: Add incremental shares for: Effect of dilutive securities - options — — — Total $ 91,604 $ 5.73 $ 92,657 $ 5.60 $ 93,058 $ 5.68 As of December 31, 2022, all stock options have been exercised and there are no options outstanding. There were no stock options exercisable at December 31, 2022, 2021 and 2020 that would have had an anti-dilutive effect on the above computation. New Accounting Standards Accounting Standards Updates (“ASU”) ASU 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the accounting guidance for troubled debt restructurings and requires entities to evaluate all loan modifications to determine if they result in a new loan or a continuation of an existing loan. Additionally, ASU 2022-02 requires entities to disclose current-period gross charge-offs by year of origination. ASU 2022-02 will be effective for the Company on January 1, 2023 and is not expected to have a significant impact on the Company’s financial statements. ASU 2020-04, Reference Rate Reform: Facilitation of the Effects of Reference Rate Reform on Financial Reporting – ASC Topic 848. ASU 2020-04 became effective for the Company on January 1, 2022 and provides optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. ASU 2020-04 was effective upon issuance. In addition, the FASB issued ASU 2022-06 - Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 , which extends the period of time preparers can utilize the reference rate reform relief guidance provided by ASU 2020-04 from December 31, 2022 to December 31, 2024. ASU 2022-06 was effective upon issuance and did not change the core principles in ASU 2020-04. Prior to the end of 2021, the Company began transitioning away from LIBOR to Secured Overnight Financing Rate (“SOFR”) or other alternative variable rate indexes for its interest-rate swaps and loans historically using LIBOR as an index. As of December 31, 2022 and 2021, LIBOR was used as an index rate for the Company’s interest-rate swaps and approximately 1.5 % and 11.4 % of the Company’s loan portfolio, respectively . The adoption of ASU 2020-04 did not have a significant impact on the Company’s financial statements.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2022
Business Combinations [Abstract]
Acquisitions	2. ACQUISITIONS Acquisitions are an integral part of the Company’s growth strategy. All acquisitions were accounted for using the acquisition method of accounting. Accordingly, the assets and liabilities of the acquired entities were recorded at their fair values at the acquisition date. The excess of the purchase price over the estimated fair value of the net assets for tax-free acquisitions was recorded as goodwill, none of which is deductible for tax purposes. The excess of the purchase price over the estimated fair value of the net assets for taxable acquisitions was also recorded as goodwill and is deductible for tax purposes. The identified core deposit intangibles for each acquisition are being amortized using a non-pro rata basis over an estimated life of 10 to 15 years . The results of operations for each acquisition have been included in the Company’s consolidated financial results beginning on the respective acquisition date. The measurement period for the Company to determine the fair values of acquired identifiable assets and assumed liabilities will end at the earlier of (1) twelve months from the date of the acquisition or (2) as soon as the Company receives the information it was seeking about facts and circumstances that existed as of the acquisition date or learns that more information is not obtainable. Pending Acquisitions Pending Acquisition of First Bancshares of Texas, Inc. (“First Bancshares”) — On October 11, 2022, Bancshares and First Bancshares jointly announced the signing of a definitive merger agreement whereby First Bancshares, the parent company of FirstCapital Bank of Texas, N.A. (“FirstCapital Bank”), will merge with and into Bancshares. FirstCapital Bank operates 16 full-service banking offices in 6 different markets in West, North and Central Texas areas, including its main office in Midland, and banking offices in Midland, Lubbock, Amarillo, Wichita Falls, Burkburnett, Byers, Henrietta, Dallas, Horseshoe Bay, Marble Falls and Fredericksburg, Texas. As of December 31, 2022, First Bancshares, on a consolidated basis, reported total assets of $ 2.16 billion, total loans of $ 1.64 billion and total deposits of $ 1.80 billion. Under the terms of the merger agreement, Bancshares will issue 3,583,370 shares of its common stock plus $ 93.4 million in cash for all outstanding shares of First Bancshares capital stock, subject to certain conditions and potential adjustments. Based on the closing price of Bancshares’ common stock of $ 69.27 on October 7, 2022, the total consideration was valued at approximately $ 341.6 million. The transaction is subject to customary closing conditions, including the receipt of regulatory approvals and approval of the shareholders of First Bancshares. The transaction is expected to close during the first half of 2023, although delays could occur. Pending Acquisition of Lone Star State Bancshares, Inc. (“Lone Star”) — On October 11, 2022, Bancshares and Lone Star State Bancshares, Inc. (“Lone Star”) jointly announced the signing of a definitive merger agreement whereby Lone Star, the parent company of Lone Star State Bank of West Texas (“Lone Star Bank”), will merge with and into Bancshares. Lone Star Bank operates 5 banking offices in the West Texas area, including its main office in Lubbock, and 1 banking center in each of Brownfield, Midland, Odessa and Big Spring, Texas. As of December 31, 2022, Lone Star, on a consolidated basis, reported total assets of $ 1.43 billion, total loans of $ 999.6 million and total deposits of $ 1.28 billion. Under the terms of the merger agreement, Bancshares will issue 2,376,182 shares of its common stock plus $ 64.1 million in cash for all outstanding shares of Lone Star capital stock, subject to certain conditions and potential adjustments. Based on the closing price of Bancshares’ common stock of $ 69.27 on October 7, 2022, the total consideration was valued at approximately $ 228.7 million. The transaction is subject to customary closing conditions, including the receipt of regulatory approvals and approval of the shareholders of Lone Star. The transaction is expected to close during the first half of 2023, although delays could occur. Acquired Loans Acquired loans were preliminarily recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected default rates, loss given default and recovery rates. During the valuation process, the Company identified PCD and Non-PCD loans in the acquired loan portfolios. PCD loan identification considers the following factors: payment history and past due status, debt service coverage, loan grading, collateral values and other factors that may indicate deterioration of credit quality since origination as of the acquisition date. Non-PCD loan identification considers the following factors: account types, remaining terms, annual interest rates or coupons, current market rates, interest types, past delinquencies, timing of principal and interest payments, loan to value ratios, loss exposures and remaining balances. Accretion of purchased discounts on PCD loans will be based on future cash flows, taking into account contractual maturities. Accretion of purchased discounts on Non-PCD loans will be recognized on a level-yield basis based on contractual maturity of individual loans. PCD Loans. The recorded investment in PCD loans included in the consolidated balance sheets and the related outstanding balances at December 31, 2022 and 2021 are presented in the table below. The outstanding balance represents the total amount owed as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 (Dollars in thousands) PCD loans: Outstanding balance $ 63,383 $ 83,909 Discount ( 3,361 ) ( 4,838 ) Recorded investment $ 60,022 $ 79,071 Changes in the accretable yield for acquired PCD loans for the years ended December 31, 2022 and 2021 were as follows: Year Ended December 31, 2022 2021 (Dollars in thousands) Balance at beginning of period $ 4,838 $ 14,216 Accretion charge-offs — ( 1,540 ) Accretion ( 1,477 ) ( 7,838 ) Balance at December 31, $ 3,361 $ 4,838 Income recognition on PCD loans is subject to the timing and amount of future cash flows. PCD loans for which the Company is accruing interest income are not considered nonperforming or impaired. The PCD discount reflected above as of December 31, 2022, represents the amount of discount available to be recognized as income. Non-PCD Loans. The recorded investment in Non-PCD loans included in the consolidated balance sheets and the related outstanding balances at December 31, 2022 and 2021 are presented in the table below. The outstanding balance represents the total amount owed as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 (Dollars in thousands) Non-PCD loans: Outstanding balance $ 1,319,507 $ 2,094,039 Discount ( 2,233 ) ( 8,143 ) Recorded investment $ 1,317,274 $ 2,085,896 Changes in the discount accretion for Non-PCD loans for the years ended December 31, 2022 and 2021 were as follows: Year Ended December 31, 2022 2021 (Dollars in thousands) Balance at beginning of period $ 8,143 $ 39,587 Accretion recoveries (charge-offs) 14 ( 4 ) Accretion ( 5,924 ) ( 31,440 ) Balance at December 31, $ 2,233 $ 8,143 At December 31, 2022 , the Company had $ 5.6 million of total outstanding accretable discounts on Non-PCD and PCD loans.

Goodwill and Core Deposit Intan

Goodwill and Core Deposit Intangibles	12 Months Ended
	Dec. 31, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Core Deposit Intangibles	3. GOODWILL AND CORE DEPOSIT INTANGIBLES Changes in the carrying amount of the Company’s goodwill and core deposit intangibles for fiscal years 2022 and 2021 were as follows: Goodwill Core Deposit Intangibles (Dollars in thousands) Balance as of December 31, 2020 $ 3,231,636 $ 73,235 Less: Amortization — ( 11,551 ) Balance as of December 31, 2021 3,231,636 61,684 Less: Amortization — ( 10,336 ) Balance as of December 31, 2022 $ 3,231,636 $ 51,348 Management performs an evaluation annually, and more frequently if a triggering event occurs, of whether any impairment of the goodwill or core deposit intangibles has occurred. If any such impairment is determined, a write down is recorded. Based on the Company’s annual goodwill impairment test, management does no t believe any of its goodwill is impaired as of December 31, 2022. Core deposit intangibles are being amortized on a non-pro rata basis over their estimated lives, which the Company believes is between 10 and 15 years . The estimated aggregate future amortization expense for core deposit intangibles remaining as of December 31, 2022 is as follows (dollars in thousands): 2023 $ 9,360 2024 8,699 2025 8,173 2026 7,684 Thereafter 17,432 Total $ 51,348

Securities

Securities	12 Months Ended
	Dec. 31, 2022
Investments Debt And Equity Securities [Abstract]
Securities	4. SECURITIES The amortized cost and fair value of investment securities were as follows: December 31, 2022 Amortized Cost Gross Gross Fair Value (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 359,251 $ 1,190 $ ( 3,039 ) $ 357,402 Mortgage-backed securities 101,647 93 ( 2,640 ) 99,100 Total $ 460,898 $ 1,283 $ ( 5,679 ) $ 456,502 Held to Maturity States and political subdivisions $ 122,361 $ 868 $ ( 3,255 ) $ 119,974 Corporate debt securities 12,000 — ( 2,520 ) 9,480 Collateralized mortgage obligations 271,727 377 ( 22,922 ) 249,182 Mortgage-backed securities 13,613,415 2,575 ( 1,607,501 ) 12,008,489 Total $ 14,019,503 $ 3,820 $ ( 1,636,198 ) $ 12,387,125 December 31, 2021 Amortized Cost Gross Gross Fair Value (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 483,761 $ 1,942 $ ( 32 ) $ 485,671 Mortgage-backed securities 28,881 550 ( 170 ) 29,261 Total $ 512,642 $ 2,492 $ ( 202 ) $ 514,932 Held to Maturity States and political subdivisions $ 132,620 $ 5,968 $ ( 114 ) $ 138,474 Collateralized mortgage obligations 39,675 483 ( 78 ) 40,080 Mortgage-backed securities 12,131,674 87,967 ( 146,982 ) 12,072,659 Total $ 12,303,969 $ 94,418 $ ( 147,174 ) $ 12,251,213 The investment securities portfolio is measured for expected credit losses by segregating the portfolio into two general segments and applying the appropriate expected credit losses methodology. Investment securities classified as available for sale or held to maturity are evaluated for expected credit losses under FASB ASC Topic 326, “Financial Instruments – Credit Losses.” Available for sale securities . For available for sale securities in an unrealized loss position, the amount of the expected credit losses recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the expected credit losses will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the expected credit losses will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total expected credit losses related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis and such difference is recognized in earnings. The amount of the total expected credit losses related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the expected credit losses recognized in earnings will become the new amortized cost basis of the investment. As of December 31, 2022, management does not have the intent to sell any of the securities classified as available for sale before a recovery of cost. In addition, management believes it is more likely than not that the Company will not be required to sell any of its investment securities before a recovery of cost. The unrealized losses are largely due to changes in market interest rates and spread relationships since the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of December 31, 2022, management believes that there is no potential for credit losses on available for sale securities. Held to maturity securities . The Company’s held to maturity investments include mortgage-related bonds issued by either the Government National Mortgage Corporation (“Ginnie Mae”), Federal National Mortgage Association (“Fannie Mae”) or Federal Home Loan Mortgage Corporation (“Freddie Mac”). Ginnie Mae issued securities are explicitly guaranteed by the U.S. government, while Fannie Mae and Freddie Mac issued securities are fully guaranteed by those respective United States government-sponsored agencies, and conditionally guaranteed by the full faith and credit of the United States. The Company’s held to maturity securities also include taxable and tax-exempt municipal securities issued primarily by school districts, utility districts and municipalities located in Texas. The Company’s investment in municipal securities is exposed to credit risk. The securities are highly rated by major rating agencies and regularly reviewed by management. A significant portion are guaranteed or insured by either the Texas Permanent School Fund, Assured Guaranty or Build America Mutual. As of December 31, 2022 , the Company’s municipal securities represent 0.8 % of the securities portfolio. Management has the ability and intent to hold the securities classified as held to maturity until they mature, at which time the Company will receive full value for the securities. Accordingly, as of December 31, 2022 , management believes that there is no potential for material credit losses on held to maturity securities. Securities with unrealized losses segregated by length of time such securities have been in a continuous loss position were as follows: December 31, 2022 Less than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 61,559 $ ( 3,012 ) $ 99,179 $ ( 27 ) $ 160,738 $ ( 3,039 ) Mortgage-backed securities 95,212 ( 2,627 ) 291 ( 13 ) 95,503 ( 2,640 ) Total $ 156,771 $ ( 5,639 ) $ 99,470 $ ( 40 ) $ 256,241 $ ( 5,679 ) Held to Maturity States and political subdivisions $ 49,782 $ ( 885 ) $ 16,298 $ ( 2,370 ) $ 66,080 $ ( 3,255 ) Corporate debt securities 9,480 ( 2,520 ) — — 9,480 ( 2,520 ) Collateralized mortgage obligations 214,538 ( 22,557 ) 4,358 ( 365 ) 218,896 ( 22,922 ) Mortgage-backed securities 5,276,315 ( 416,053 ) 6,585,470 ( 1,191,448 ) 11,861,785 ( 1,607,501 ) Total $ 5,550,115 $ ( 442,015 ) $ 6,606,126 $ ( 1,194,183 ) $ 12,156,241 $ ( 1,636,198 ) December 31, 2021 Less than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 164,220 $ ( 31 ) $ 25,916 $ ( 1 ) $ 190,136 $ ( 32 ) Mortgage-backed securities 2 — 19,674 ( 170 ) 19,676 ( 170 ) Total $ 164,222 $ ( 31 ) $ 45,590 $ ( 171 ) $ 209,812 $ ( 202 ) Held to Maturity States and political subdivisions $ 6,216 $ ( 60 ) $ 1,454 $ ( 54 ) $ 7,670 $ ( 114 ) Collateralized mortgage obligations 8,166 ( 78 ) — — 8,166 ( 78 ) Mortgage-backed securities 7,553,096 ( 141,652 ) 288,359 ( 5,330 ) 7,841,455 ( 146,982 ) Total $ 7,567,478 $ ( 141,790 ) $ 289,813 $ ( 5,384 ) $ 7,857,291 $ ( 147,174 ) At December 31, 2022 and 2021 there were 174 securities and 30 securities, respectively, in an unrealized loss position for 12 months or more. The table below summarizes the amortized cost and fair value of investment securities at December 31, 2022, by contractual maturity. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations at any time with or without call or prepayment penalties. Held to Maturity Available for Sale Amortized Cost Fair Value Amortized Cost Fair Value (Dollars in thousands) Due in one year or less $ 14,338 $ 14,349 $ — $ — Due after one year through five years 57,687 58,215 — — Due after five years through ten years 47,138 43,330 — — Due after ten years 15,198 13,560 — — Subtotal 134,361 129,454 — — Mortgage-backed securities and collateralized mortgage obligations 13,885,142 12,257,671 460,898 456,502 Total $ 14,019,503 $ 12,387,125 $ 460,898 $ 456,502 The Company recorded no gain or loss on sale of securities for the year ended December 31, 2022, 2021, and 2020, respectively. As of December 31, 2022, the Company did not own any non-agency collateralized mortgage obligations. At December 31, 2022 and 2021 , the Company did not own securities of any one issuer (other than the U.S. government and its agencies) for which aggregate adjusted cost exceeded 10 % of the consolidated shareholders’ equity at such respective dates. Securities with an amortized cost of $ 7.87 billion and $ 6.97 billion and a fair value of $ 6.90 billion and $ 6.99 billion at December 31, 2022 and 2021 , respectively, were pledged to collateralize public deposits and for other purposes required or permitted by law.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Loans and Allowance for Credit Losses	5. LOANS AND ALLOWANCE FOR CREDIT LOSSES The loan portfolio consists of various types of loans made principally to borrowers located within the states of Texas and Oklahoma and is categorized by major type as follows: December 31, 2022 2021 (Dollars in thousands) Residential mortgage loans held for sale $ 554 $ 7,274 Commercial and industrial 2,594,742 2,711,820 Real estate: Construction, land development and other land loans 2,805,438 2,299,715 1-4 family residential (including home equity) 6,740,670 5,661,434 Commercial real estate (including multi-family residential) 4,986,211 5,251,368 Farmland 518,095 442,343 Agriculture 169,938 177,995 Consumer and other 283,559 288,496 Total loans held for investment, excluding Warehouse Purchase Program 18,098,653 16,833,171 Warehouse Purchase Program 740,620 1,775,699 Total loans, including Warehouse Purchase Program $ 18,839,827 $ 18,616,144 Loan Origination/Risk Management. The Company has certain lending policies and procedures in place that are designed to maximize loan income within an acceptable level of risk. Management reviews and approves these policies and procedures on a regular basis. A reporting system supplements the review process by providing management with frequent reports related to loan production, loan quality, concentrations of credit, loan delinquencies and non-performing and potential problem loans. Diversification in the loan portfolio is a means of managing risk associated with fluctuations in economic conditions. Loans to borrowers with aggregate debt relationships over $ 1.0 million and below $ 5.0 million are evaluated and acted upon on a daily basis by two of the company-wide loan concurrence officers. Loans to borrowers with aggregate debt relationships above $5.0 million are evaluated and acted upon by an officers’ loan committee that meets weekly. The Company maintains an independent loan review department that reviews and validates the credit risk program on a periodic basis. Results of these reviews are presented to management. The loan review process complements and reinforces the risk identification and assessment decisions made by lenders and credit personnel, as well as the Company’s policies and procedures. (i) Commercial and Industrial Loans . In nearly all cases, the Company’s commercial loans are made in the Company’s market areas and are underwritten based on the borrower's ability to service the debt from the conversion of working assets or cash flow. Working capital loans are primarily collateralized by short-term assets whereas term loans are primarily collateralized by long-term assets. As a general practice, term loans are secured by any available real estate, equipment or other assets owned by the borrower. Both working capital and term loans are typically supported by a personal guaranty of a principal. In general, commercial loans involve more credit risk than residential mortgage loans and commercial mortgage loans and, therefore, usually yield a higher return. The increased risk in commercial loans is due to the type of collateral securing these loans as well as the expectation that commercial loans generally will be serviced principally from the operations of the business, and those operations may not be successful. Historical trends have shown these types of loans to have higher delinquencies than mortgage loans. As a result of these additional complexities, variables and risks, commercial loans require more thorough underwriting and servicing than other types of loans. (ii) Commercial Real Estate . The Company makes commercial real estate loans collateralized by owner-occupied and nonowner-occupied real estate to finance the purchase of real estate. The Company’s commercial real estate loans are collateralized by first liens on real estate, typically have variable interest rates (or five year or less fixed rates) and amortize over a 15 - to 25 -year period. Payments on loans secured by nonowner-occupied properties are often dependent on the successful operation or management of the properties. Accordingly, repayment of these loans may be subject to adverse conditions in the real estate market or the economy to a greater extent than other types of loans. The Company seeks to minimize these risks in a variety of ways, including giving careful consideration of the property’s operating history, future operating projections, current and projected occupancy, location and physical condition in connection with underwriting these loans. The underwriting analysis also includes credit verification, analysis of global cash flow, collateral valuation and a review of the financial condition of the borrower and guarantor. (iii) 1-4 Family Residential Loans . The Company’s lending activities also include the origination of 1-4 family residential mortgage loans (including home equity loans) collateralized by owner-occupied and nonowner-occupied residential properties located in the Company’s market areas. The Company offers a variety of mortgage loan portfolio products which generally are amortized over five to 30 years. Loans collateralized by 1-4 family residential real estate generally have been originated in amounts of no more than 89 % of appraised value. The Company requires mortgage title insurance, as well as hazard, wind and/or flood insurance as appropriate. The Company prefers to retain residential mortgage loans for its own account rather than selling them into the secondary market. By doing so, the Company incurs interest rate risk as well as the risks associated with non-payments on such loans. The Company’s mortgage department also offers a variety of mortgage loan products which are generally amortized over 30 years, including FHA and VA loans, which are sold to secondary market investors. (iv) Construction, Land Development and Other Land Loans . The Company makes loans to finance the construction of residential and nonresidential properties. Construction loans generally are collateralized by first liens on real estate and have variable interest rates. The Company conducts periodic inspections, either directly or through an agent, prior to approval of periodic draws on these loans. Underwriting guidelines similar to those described above are also used in the Company’s construction lending activities, with heightened analysis of construction and/or development costs. Construction loans involve additional risks attributable to the fact that loan funds are advanced upon the security of a project under construction, and the project is of uncertain value prior to its completion. Because of uncertainties inherent in estimating construction costs, the market value of the completed project and the effects of governmental regulation on real property, it can be difficult to accurately evaluate the total funds required to complete a project and the related loan to value ratio. As a result of these uncertainties, construction lending often involves the disbursement of substantial funds with repayment dependent, in part, on the success of the ultimate project rather than the ability of a borrower or guarantor to repay the loan. If the Company is forced to foreclose on a project prior to completion, the Company may not be able to recover all of the unpaid portion of the loan. In addition, the Company may be required to fund additional amounts to complete a project and may have to hold the property for an indeterminate period of time. Although the Company has underwriting procedures designed to identify what it believes to be acceptable levels of risks in construction lending, these procedures may not prevent losses from the risks described above. (v) Warehouse Purchase Program . The Warehouse Purchase Program allows unaffiliated mortgage originators (“Clients”) to close 1-4 family real estate loans in their own name and manage their cash flow needs until the loans are sold to investors. The Company's Clients are strategically targeted for their experienced management teams and analyzed for the expected profitability of each Client’s business model over the long term. The Clients are located across the U.S. and originate mortgage loans primarily through traditional retail and/or wholesale business models using underwriting standards consistent with the United States government-sponsored enterprises, “Agencies” such as Fannie Mae, the private investors to which the mortgage loans are ultimately sold and the mortgage insurers. Although not subject to any legally binding commitment, when the Company makes a purchase decision, it acquires a 100 % participation interest in the mortgage loans originated by its Clients. Individual mortgage loans are warehoused in the Company’s portfolio only for a short duration, averaging less than 30 days. When instructed by a Client that a warehoused loan has been sold to an investor, the Company delivers the note to the investor that pays the Company, which in turn remits the net sales proceeds to the Client. (vi) Agriculture Loans . The Company provides agriculture loans for short-term livestock and crop production, including rice, cotton, milo and corn, farm equipment financing and agriculture real estate financing. The Company evaluates agriculture borrowers primarily based on their historical profitability, level of experience in their particular industry segment, overall financial capacity and the availability of secondary collateral to withstand economic and natural variations common to the industry. Because agriculture loans present a higher level of risk associated with events caused by nature, the Company routinely makes on-site visits and inspections in order to identify and monitor such risks. (vii) Consumer Loans . Consumer loans made by the Company include direct “A”-credit automobile loans, recreational vehicle loans, boat loans, home improvement loans, personal loans (collateralized and uncollateralized) and deposit account collateralized loans. The terms of these loans typically range from 12 to 180 months and vary based upon the nature of collateral and size of loan. Generally, consumer loans entail greater risk than do real estate secured loans, particularly in the case of consumer loans that are unsecured or collateralized by rapidly depreciating assets such as automobiles. In such cases, any repossessed collateral for a defaulted consumer loan may not provide an adequate source of repayment for the outstanding loan balance. The remaining deficiency often does not warrant further substantial collection efforts against the borrower beyond obtaining a deficiency judgment. In addition, consumer loan collections are dependent on the borrower’s continuing financial stability, and thus are more likely to be adversely affected by job loss, divorce, illness, personal bankruptcy or death. Furthermore, the application of various federal and state laws may limit the amount which can be recovered on such loans. Loan Maturities. The contractual maturity ranges of the Company’s loan portfolio, excluding loans held for sale of $ 554 thousand and Warehouse Purchase Program Loans of $ 740.6 million, by type of loan and the amount of such loans with predetermined interest rates and variable rates in each maturity range as of December 31, 2022 are summarized in the following table. Contractual maturities are based on contractual amounts outstanding and do not include loan purchase discounts of $ 5.6 million. One Year or Less After One Year After Five Years After Fifteen Years Total (Dollars in thousands) Commercial and industrial $ 912,464 $ 1,159,238 $ 391,577 $ 134,896 $ 2,598,175 Real estate: Construction, land development and other land loans 525,939 605,405 482,483 1,191,626 2,805,453 1-4 family residential (includes home equity) 36,077 140,770 2,063,624 4,493,583 6,734,054 Commercial (includes multi-family residential) 242,863 654,570 2,359,080 1,737,614 4,994,127 Agriculture (includes farmland) 133,103 64,496 240,382 250,568 688,549 Consumer and other 76,253 72,547 73,052 62,037 283,889 Total $ 1,926,699 $ 2,697,026 $ 5,610,198 $ 7,870,324 $ 18,104,247 Loans with a predetermined interest rate $ 494,309 $ 1,029,637 $ 3,597,784 $ 2,947,066 $ 8,068,796 Loans with a variable interest rate 1,432,390 1,667,389 2,012,414 4,923,258 10,035,451 Total $ 1,926,699 $ 2,697,026 $ 5,610,198 $ 7,870,324 $ 18,104,247 Concentrations of Credit. Most of the Company’s lending activity occurs within the states of Texas and Oklahoma. Commercial real estate loans, 1-4 family residential loans and construction, land development and other land loans make up 80.3 % and 78.5 % of the Company’s total loan portfolio, excluding Warehouse Purchase Program loans, at December 31, 2022 and 2021, respectively. As of December 31, 2022 and 2021 , excluding Warehouse Purchase Program loans, there were no concentrations of loans related to any single industry in excess of 10 % of total loans. Related Party Loans . As of December 31, 2022 and 2021 , loans outstanding to directors, officers and their affiliates totaled $ 547 thousand and $ 6.5 million, respectively. All transactions between the Company and such related parties are conducted in the ordinary course of business and made on the same terms and conditions as similar transactions with unaffiliated persons. An analysis of activity with respect to these related-party loans is as follows: As of and for the year ended December 31, 2022 2021 (Dollars in thousands) Beginning balance on January 1 $ 6,524 $ 1,732 New loans 54 5,761 Repayments ( 6,031 ) ( 969 ) Ending balance $ 547 $ 6,524 Nonperforming Assets and Nonaccrual and Past Due Loans. The Company has several procedures in place to assist it in maintaining the overall quality of its loan portfolio. The Company has established underwriting guidelines to be followed by its officers, including requiring appraisals on loans collateralized by real estate. The Company also monitors its delinquency levels for any negative or adverse trends. Nevertheless, the Company’s loan portfolio could become subject to increasing pressures from deteriorating borrower credit due to general economic conditions. The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured, which is typically evidenced by a sustained period (at least six months) of repayment performance by the borrower. With respect to potential problem loans, an evaluation of the borrower’s overall financial condition is made to determine the need, if any, for possible write downs or appropriate additions to the allowance for credit losses. An aging analysis of past due loans, segregated by category of loan, is presented below: December 31, 2022 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total Loans (Dollars in thousands) Construction, land development and other land loans $ 9,976 $ 4,442 $ 14,418 $ 318 $ 2,790,702 $ 2,805,438 Warehouse Purchase Program loans — — — — 740,620 740,620 Agriculture and agriculture real estate (includes farmland) 1,751 — 1,751 421 685,861 688,033 1-4 family (includes home equity) (1) 25,880 7 25,887 14,762 6,700,575 6,741,224 Commercial real estate (includes multi-family residential) 3,176 — 3,176 1,649 4,981,386 4,986,211 Commercial and industrial 10,575 1,468 12,043 2,453 2,580,246 2,594,742 Consumer and other 378 — 378 11 283,170 283,559 Total $ 51,736 $ 5,917 $ 57,653 $ 19,614 $ 18,762,560 $ 18,839,827 December 31, 2021 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total Loans (Dollars in thousands) Construction, land development and other land loans $ 4,572 $ — $ 4,572 $ 1,841 $ 2,293,302 $ 2,299,715 Warehouse Purchase Program loans — — — — 1,775,699 1,775,699 Agriculture and agriculture real estate (includes farmland) 995 — 995 546 618,797 620,338 1-4 family (includes home equity) (1) 12,963 19 12,982 11,348 5,644,378 5,668,708 Commercial real estate (includes multi-family residential) 5,773 118 5,891 7,159 5,238,318 5,251,368 Commercial and industrial 4,041 750 4,791 5,360 2,701,669 2,711,820 Consumer and other 450 — 450 15 288,031 288,496 Total $ 28,794 $ 887 $ 29,681 $ 26,269 $ 18,560,194 $ 18,616,144 (1) Includes $ 554 thousand and $ 7.3 million of residential mortgage loans held for sale at December 31, 2022 and December 31, 2021 , respectively. The following table presents information regarding nonperforming assets at the dates indicated: December 31, 2022 2021 2020 (Dollars in thousands) Nonaccrual loans (1) $ 19,614 (2) $ 26,269 (2) $ 47,185 (2) Accruing loans 90 or more days past due 5,917 887 1,699 Total nonperforming loans 25,531 27,156 48,884 Repossessed assets — 310 93 Other real estate 1,963 622 10,593 Total nonperforming assets $ 27,494 $ 28,088 $ 59,570 Nonperforming assets to total loans and other real estate 0.15 % 0.15 % 0.29 % Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate 0.15 % 0.17 % 0.34 % Nonaccrual loans to total loans 0.10 % 0.14 % 0.23 % Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans 0.11 % 0.16 % 0.27 % (1) Includes troubled debt restructurings of $ 4.6 million, $ 4.2 million and $ 11.3 million for the years ended December 31, 2022, 2021and 2020, respectively. (2) There were no nonperforming or troubled debt restructurings of Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented. The Company had $ 27.5 million in nonperforming assets at December 31, 2022 compared with $ 28.1 million at December 31, 2021 and $ 59.6 million at December 31, 2020 . Nonperforming assets were 0.15 % of total loans and other real estate at December 31, 2022 compared with 0.15 % of total loans and other real estate at December 31, 2021 , and 0.29 % of total loans and other real estate at December 31, 2020 . The nonperforming assets consisted of 170 separate credits or other real estate properties at December 31, 2022 , compared with 157 at December 31, 2021 , and 208 at December 31, 2020. If interest on nonaccrual loans had been accrued under the original loan terms, approximately $ 1.8 million, $ 6.5 million and $ 3.3 million would have been recorded as income for the years ended December 31, 2022, 2021, and 2020 , respectively. The Company had $ 19.6 million, $ 26.3 million and $ 47.2 million in nonaccrual loans at December 31, 2022, 2021, and 2020, respectively. Credit Quality Indicators. As part of the ongoing monitoring of the credit quality of the Company’s loan portfolio and methodology for calculating the allowance for credit losses, management assigns and tracks loan grades to be used as credit quality indicators. The following is a general description of the loan grades used: Grade 1 —Credits in this category have risk potential that is virtually nonexistent. These loans may be secured by insured certificates of deposit, insured savings accounts, U.S. Government securities and highly rated municipal bonds. Grade 2 —Credits in this category are of the highest quality. These borrowers represent top-rated companies and individuals with unquestionable financial standing with excellent global cash flow coverage, net worth, liquidity and collateral coverage. Grade 3 —Credits in this category are not immune from risk but are well protected by the collateral and paying capacity of the borrower. These loans may exhibit a minor unfavorable credit factor, but the overall credit is sufficiently strong to minimize the possibility of loss. Grade 4 —Credits in this category are considered to be of acceptable credit quality with moderately greater risk than Grade 3 and receiving closer monitoring. Loans in this category have sources of repayment that remain sufficient to preclude a larger than normal probability of default and secondary sources are likewise currently of sufficient quantity, quality, and liquidity to protect the Company against loss of principal and interest. These borrowers have specific risk factors, but the overall strength of the credit is acceptable based on other mitigating credit and/or collateral factors and can repay the debt in the normal course of business. Grade 5 —Credits in this category constitute an undue and unwarranted credit risk; however, the factors do not rise to a level of substandard. These credits have potential weaknesses and/or declining trends that, if not corrected, could expose the Company to risk at a future date. These loans are monitored on the Company’s internally-generated watch list and evaluated on a quarterly basis. Grade 6 —Credits in this category are considered “substandard” but “non-impaired” loans in accordance with regulatory guidelines. Loans in this category have well-defined weakness that, if not corrected, could make default of principal and interest possible. Loans in this category are still accruing interest and may be dependent upon secondary sources of repayment and/or collateral liquidation. Grade 7 —Credits in this category are deemed “substandard” and “impaired” pursuant to regulatory guidelines. As such, the Company has determined that it is probable that less than 100% of the contractual principal and interest will be collected. These loans are individually evaluated for a specific reserve and will typically have the accrual of interest stopped. Grade 8 —Credits in this category include “doubtful” loans in accordance with regulatory guidance. Such loans are no longer accruing interest and factors indicate a loss is imminent. These loans are also deemed “impaired.” While a specific reserve may be in place while the loan and collateral are being evaluated these loans are typically charged down to an amount the Company estimates is collectible. Grade 9 —Credits in this category are deemed a “loss” in accordance with regulatory guidelines and have been charged off or charged down. The Company may continue collection efforts and may have partial recovery in the future. The following table presents loans by risk grade and category of loan and year of origination at December 31, 2022. Term Loans Amortized Cost Basis by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Construction, Land Development and Other Land Loans Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 357 — — — — 96 — — 453 Grade 3 1,273,281 773,814 224,007 142,311 36,528 35,289 146,374 17,425 2,649,029 Grade 4 59,822 39,739 10,320 2,342 4,388 6,714 2,916 — 126,241 Grade 5 — — — 17,926 — 661 1,193 — 19,780 Grade 6 3,114 5,947 — — 93 294 — — 9,448 Grade 7 — — — — — 28 290 — 318 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — 94 — 75 — — 169 Total $ 1,336,574 $ 819,500 $ 234,327 $ 162,673 $ 41,009 $ 43,157 $ 150,773 $ 17,425 $ 2,805,438 Agriculture and Agriculture Real Estate (includes Farmland) Grade 1 $ 2,661 $ 412 $ 75 $ — $ 60 $ — $ 8,931 $ 19 $ 12,158 Grade 2 — 110 — — — 1,140 25 — 1,275 Grade 3 224,762 101,179 65,195 39,642 25,284 75,494 79,593 1,018 612,167 Grade 4 14,945 22,737 3,427 524 1,195 8,093 7,052 — 57,973 Grade 5 543 299 — 535 33 865 — — 2,275 Grade 6 250 816 — — — 513 — — 1,579 Grade 7 — — 213 22 — 165 21 — 421 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — 185 — — 185 Total $ 243,161 $ 125,553 $ 68,910 $ 40,723 $ 26,572 $ 86,455 $ 95,622 $ 1,037 $ 688,033 1-4 Family (includes Home Equity) (1) Grade 1 $ — $ — $ 112 $ — $ — $ — $ — $ — $ 112 Grade 2 — 165 248 75 97 3,480 — — 4,065 Grade 3 1,766,032 2,059,111 1,145,209 464,160 226,749 817,864 111,651 675 6,591,451 Grade 4 22,060 19,699 6,444 8,650 13,705 45,066 4,924 103 120,651 Grade 5 70 — 598 4,417 1,218 1,651 — — 7,954 Grade 6 165 233 15 145 567 1,104 — — 2,229 Grade 7 680 2,076 2,237 1,421 2,722 5,626 — — 14,762 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 1,789,007 $ 2,081,284 $ 1,154,863 $ 478,868 $ 245,058 $ 874,791 $ 116,575 $ 778 $ 6,741,224 Term Loans Amortized Cost Basis by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Commercial Real Estate (includes Multi-Family Residential) Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 7,268 — 354 138 — 1,032 — — 8,792 Grade 3 937,839 659,746 475,697 318,409 316,986 858,432 88,419 — 3,655,528 Grade 4 128,508 207,769 158,787 73,168 159,218 321,051 18,969 248 1,067,718 Grade 5 1,113 - 5,879 34,823 23,376 31,609 1,096 — 97,896 Grade 6 15 7,129 25,526 — 1,137 76,221 — — 110,028 Grade 7 — — — — 889 395 365 — 1,649 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 18,597 20,760 5,019 193 31 — — 44,600 Total $ 1,074,743 $ 893,241 $ 687,003 $ 431,557 $ 501,799 $ 1,288,771 $ 108,849 $ 248 $ 4,986,211 Commercial and Industrial Grade 1 $ 26,949 $ 9,275 $ 1,991 $ 1,196 $ 260 $ 118 $ 24,738 $ 42 $ 64,569 Grade 2 8,814 2,382 263 — 298 1,791 1,966 — 15,514 Grade 3 450,071 221,557 98,478 82,418 42,685 131,097 1,112,918 364 2,139,588 Grade 4 44,502 15,186 14,022 29,121 39,720 18,701 111,152 207 272,611 Grade 5 9,800 11,318 561 116 305 — 18,450 — 40,550 Grade 6 475 619 5,067 1,629 4 — 36,595 — 44,389 Grade 7 1,243 659 17 238 4 101 191 — 2,453 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 172 97 228 — 168 14,403 — 15,068 Total $ 541,854 $ 261,168 $ 120,496 $ 114,946 $ 83,276 $ 151,976 $ 1,320,413 $ 613 $ 2,594,742 Consumer and Other Grade 1 $ 20,279 $ 5,582 $ 2,757 $ 934 $ 818 $ 61 $ 1,927 $ — $ 32,358 Grade 2 14,103 - - - - 3,238 1,007 — 18,348 Grade 3 76,265 28,106 29,850 12,484 8,381 6,221 57,042 12 218,361 Grade 4 10 4,321 2,711 29 314 113 6,964 — 14,462 Grade 5 — — — — — — 19 — 19 Grade 6 — — — — — — — — — Grade 7 — — 6 5 — — — — 11 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 110,657 $ 38,009 $ 35,324 $ 13,452 $ 9,513 $ 9,633 $ 66,959 $ 12 $ 283,559 Term Loans Amortized Cost Basis by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Warehouse Purchase Program Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — — — — — — — — Grade 3 740,620 — — — — — — — 740,620 Grade 4 — — — — — — — — — Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 740,620 $ — $ — $ — $ — $ — $ — $ — $ 740,620 Total Grade 1 $ 49,889 $ 15,269 $ 4,935 $ 2,130 $ 1,138 $ 179 $ 35,596 $ 61 $ 109,197 Grade 2 30,542 2,657 865 213 395 10,777 2,998 — 48,447 Grade 3 5,468,870 3,843,513 2,038,436 1,059,424 656,613 1,924,397 1,595,997 19,494 16,606,744 Grade 4 269,847 309,451 195,711 113,834 218,540 399,738 151,977 558 1,659,656 Grade 5 11,526 11,617 7,038 57,817 24,932 34,786 20,758 — 168,474 Grade 6 4,019 14,744 30,608 1,774 1,801 78,132 36,595 — 167,673 Grade 7 1,923 2,735 2,473 1,686 3,615 6,315 867 — 19,614 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 18,769 20,857 5,341 193 459 14,403 — 60,022 Total $ 5,836,616 $ 4,218,755 $ 2,300,923 $ 1,242,219 $ 907,227 $ 2,454,783 $ 1,859,191 $ 20,113 $ 18,839,827 (1) Includes $ 554 thousand of residential mortgage loans held for sale at December 31, 2022 . Allowance for Credit Losses on Loans. The allowance for credit losses is adjusted through charges to earnings in the form of a provision for credit losses. Management has established an allowance for credit losses which it believes is adequate as of December 31, 2022 for estimated losses in the Company’s loan portfolio. The amount of the allowance for credit losses on loans is affected by the following: (1) charge-offs of loans that occur when loans are deemed uncollectible and decrease the allowance, (2) recoveries on loans previously charged off that increase the allowance, (3) provisions for credit losses charged to earnings that increase the allowance, and (4) provision releases returned to earnings that decrease the allowance. Based on an evaluation of the loan portfolio and consideration of the factors listed below, management presents a quarterly review of the allowance for credit losses to the Bank’s Board of Directors, indicating any change in the allowance since the last review and any recommendations as to adjustments in the allowance. Although management believes it uses the best information available to make determinations with respect to the allowance for credit losses, future adjustments may be necessary if economic conditions or borrower performance differ from the assumptions used in making the initial determinations. The Company’s allowance for credit losses on loans consists of two components: (1) a specific valuation allowance based on expected losses on specifically identified loans and (2) a general valuation allowance based on historical lifetime loan loss experience, current economic conditions, reasonable and supportable forecasted economic conditions and other qualitative risk factors both internal and external to the Company. In setting the specific valuation allowance, the Company follows a loan review program to evaluate the credit risk in the total loan portfolio and assigns risk grades to each loan. Through this loan review process, the Company maintains an internal list of impaired loans which, along with the delinquency list of loans, helps management assess the overall quality of the loan portfolio and the adequacy of the allowance for credit losses. All loans that have been identified as impaired are reviewed on a quarterly basis in order to determine whether a specific reserve is required. For certain impaired loans, the Company allocates a specific loan loss reserve primarily based on the value of the collateral securing the impaired loan in accordance with ASC Topic 326-20, “ Financial Instruments – Credit Losses. ” The specific reserves are determined on an individual loan basis. Loans for which specific reserves are provided are excluded from the general valuation allowance described below. In connection with this review of the loan portfolio, the Company considers risk elements attributable to particular loan types or categories in assessing the quality of individual loans. Some of the risk elements include: • for 1-4 family residential mortgage loans, the borrower’s ability to repay the loan, including a consideration of the debt to income ratio and employment and income stability, the loan to value ratio, and the age, condition and marketability of collateral; • for commercial real estate loans and multifamily residential loans, the debt service coverage ratio (income from the property in excess of operating expenses compared to loan payment requirements), operating results of the owner in the case of owner-occupied properties, the loan to value ratio, the age and condition of the collateral and the volatility of income, property value and future operating results typical of properties of that type; • for construction, land development and other land loans, the perceived feasibility of the project including the ability to sell developed lots or improvements constructed for resale or the ability to lease property constructed for lease, the quality and nature of contracts for presale or prelease, if any, experience and ability of the developer and loan to value ratio; • for commercial and industrial loans, the operating results of the commercial, industrial or professional enterprise, the borrower’s business, professional and financial ability and expertise, the specific risks and volatility of income and operating results typical for businesses in that category and the value, nature and marketability of collateral; • for the Warehouse Purchase Program, the capitalization and liquidity of the mortgage banking client, the operating experience, the Client’s satisfactory underwriting of purchased loans and the consistent timeliness by the Client of loan resale to investors; • for agricultural real estate loans, the experience and financial capability of the borrower, projected debt service coverage of the operations of the borrower and loan to value ratio; and • for non-real estate agricultural loans, the operating results, experience and financial capability of the borrower, historical and expected market conditions and the value, n

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value	6. FAIR VALUE The Company uses fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Fair values represent the estimated price that would be received from selling an asset or paid to transfer a liability, otherwise known as an “exit price.” Securities available for sale are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis. These nonrecurring fair value adjustments typically involve application of lower-of-cost-or-market accounting or write downs of individual assets. ASC Topic 820, “Fair Value Measurements and Disclosures” establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Fair Value Hierarchy The Company groups financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Other significant observable inputs (including quoted prices in active markets for similar assets or liabilities) or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. The fair value disclosures below represent the Company’s estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding current economic conditions, risk characteristics of the various instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in the above methodologies and assumptions could significantly affect the estimates. The following tables present fair values for assets measured at fair value on a recurring basis: December 31, 2022 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Collateralized mortgage obligations $ — $ 357,402 $ — $ 357,402 Mortgage-backed securities — 99,100 — 99,100 Total available for sale securities — 456,502 — 456,502 Derivative financial instruments: Interest rate lock commitments $ — $ 94 $ — $ 94 Forward mortgage-backed securities trades — 31 — 31 Loan customer counterparty — — — — Financial institution counterparty — 5,522 — 5,522 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ 6 $ — $ 6 Forward mortgage-backed securities trades — — — — Loan customer counterparty — 5,522 — 5,522 Financial institution counterparty — — — — December 31, 2021 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Collateralized mortgage obligations $ — $ 485,671 $ — $ 485,671 Mortgage-backed securities — 29,261 — 29,261 Total available for sale securities — 514,932 — 514,932 Derivative financial instruments: Interest rate lock commitments $ — $ 237 $ — $ 237 Forward mortgage-backed securities trades — 18 — 18 Loan customer counterparty — 4,124 — 4,124 Financial institution counterparty — — — — Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ — $ — $ — Forward mortgage-backed securities trades — 18 — 18 Loan customer counterparty — — — — Financial institution counterparty — 4,124 — 4,124 Certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These instruments include other real estate owned, repossessed assets, held to maturity debt securities, loans held for sale, and impaired loans. For the year ended December 31, 2022 , the Company had additions to other real estate owned of $ 2.4 million, of which $ 2.0 million were outstanding as of December 31, 2022. For the year ended December 31, 2022 , the Company had additions to impaired loans of $ 15.2 million, of which $ 11.6 million were outstanding as of December 31, 2022. The remaining financial assets and liabilities measured at fair value on a non-recurring basis that were recorded in 2022 and remained outstanding at December 31, 2022 were not significant. The following tables summarize the carrying values and estimated fair values of certain financial instruments not recorded at fair value on a recurring basis: As of December 31, 2022 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 423,832 $ 423,832 $ — $ — $ 423,832 Federal funds sold 301 301 — — 301 Held to maturity securities 14,019,503 — 12,387,125 — 12,387,125 Loans held for sale 554 — 554 — 554 Loans held for investment, net of allowance 17,817,077 — — 17,550,309 17,550,309 Loans held for investment - Warehouse Purchase Program 740,620 — 740,620 — 740,620 Other real estate owned 1,963 — 1,963 — 1,963 Liabilities Deposits: Noninterest-bearing $ 10,915,448 $ — $ 10,915,448 $ — $ 10,915,448 Interest-bearing 17,618,083 — 17,563,711 — 17,563,711 Other borrowings 1,850,000 — 1,850,000 — 1,850,000 Securities sold under repurchase agreements 428,134 — 428,061 — 428,061 As of December 31, 2021 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 2,547,739 $ 2,547,739 $ — $ — $ 2,547,739 Federal funds sold 241 241 — — 241 Held to maturity securities 12,303,969 — 12,251,213 — 12,251,213 Loans held for sale 7,274 — 7,274 — 7,274 Loans held for investment, net of allowance 16,546,791 — — 16,650,432 16,650,432 Loans held for investment - Warehouse Purchase Program 1,775,699 — 1,775,699 — 1,775,699 Other real estate owned 622 — 622 — 622 Liabilities Deposits: Noninterest-bearing $ 10,750,034 $ — $ 10,750,034 $ — $ 10,750,034 Interest-bearing 20,021,728 — 20,023,909 — 20,023,909 Securities sold under repurchase agreements 448,099 — 448,095 — 448,095 Entities may choose to measure eligible financial instruments at fair value at specified election dates. The fair value measurement option (1) may be applied instrument by instrument, with certain exceptions, (2) is generally irrevocable and (3) is applied only to entire instruments and not to portions of instruments. Unrealized gains and losses on items for which the fair value measurement option has been elected must be reported in earnings at each subsequent reporting date. During the reported periods, the Company had no financial instruments measured at fair value under the fair value measurement option. The fair value estimates presented herein are based on pertinent information available to management as of the dates indicated. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein. The following is a description of valuation methodologies used for assets and liabilities recorded at fair value, non-financial assets and non-financial liabilities, and for estimating fair value for financial instruments not recorded at fair value: Loans held for sale —Loans held for sale are carried at the lower of cost or estimated fair value. Fair value for consumer mortgages held for sale is based on commitments on hand from investors or prevailing market prices. As such, the Company classifies loans held for sale subjected to nonrecurring fair value adjustments as Level 2. Loans held for investment —The Company does not record loans at fair value on a recurring basis. As such, valuation techniques discussed herein for loans are primarily for estimating fair value disclosures. The Company refined the calculation to estimate fair value for loans held for investment to be in accordance with ASU 2016-01. The refined discounted cash flow calculation to determine fair value considers internal and market-based information such as prepayment risk, cost of funds and liquidity. From time to time, the Company records nonrecurring fair value adjustments to impaired loans to reflect (1) partial write downs that are based on the observable market price or current appraised value of the collateral, or (2) the full charge-off of the loan carrying value. Where appraisals are not available, estimated cash flows are discounted using a rate commensurate with the credit risk associated with those cash flows. Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information. The Company classifies the estimated fair value of loans held for investment as Level 3. Other real estate owned —Other real estate owned is primarily foreclosed properties securing residential loans and commercial real estate. Foreclosed assets are adjusted to fair value less estimated costs to sell upon transfer of the loans to other real estate owned. Subsequently, these assets are carried at the lower of carrying value or fair value less estimated costs to sell. Other real estate carried at fair value based on an observable market price or a current appraised value is classified by the Company as Level 2. When management determines that the fair value of other real estate requires additional adjustments, either as a result of a non-current appraisal or when there is no observable market price, the Company classifies the other real estate as Level 3. The fair value estimates presented herein are based on pertinent information available to management at December 31, 2022. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2022
Property Plant And Equipment [Abstract]
Premises and Equipment	7. PREMISES AND EQUIPMENT Premises and equipment are summarized as follows: December 31, 2022 2021 (Dollars in thousands) Land $ 132,515 $ 117,328 Buildings 257,334 252,003 Furniture, fixtures and equipment 102,322 98,152 Construction in progress 14,792 5,559 Total 506,963 473,042 Less accumulated depreciation ( 167,510 ) ( 153,243 ) Premises and equipment, net $ 339,453 $ 319,799 Depreciation expense was $ 18.0 million, $ 18.1 million and $ 18.2 million for the years ended December 31, 2022, 2021 and 2020 , respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2022
Deposits [Abstract]
Deposits	8. DEPOSITS Included in interest-bearing deposits are certificates of deposit in amounts of $250,000 or more. These certificates and their remaining maturities at December 31, 2022 were as follows (dollars in thousands): Three months or less $ 199,156 32.4 % Over three through six months 343,443 55.9 Over six through 12 months 53,820 8.8 Over 12 months 18,120 2.9 Total $ 614,539 100.0 % As of December 31, 2022 , the Company had no deposits classified as brokered deposits for regulatory purposes, and there are no major concentrations of deposits with any one depositor.

Other Borrowings and Securities

Other Borrowings and Securities Sold under Repurchase Agreements	12 Months Ended
	Dec. 31, 2022
Brokers And Dealers [Abstract]
Other Borrowings and Securities Sold under Repurchase Agreements	9. OTHER BORROWINGS AND SECURITIES SOLD UNDER REPURCHASE AGREEMENTS The Company utilizes borrowings to supplement deposits to fund its lending and investment activities. Borrowings consist of funds from the Federal Home Loan Bank (“FHLB”) and securities sold under repurchase agreements. December 31, 2022 2021 (Dollars in thousands) FHLB advances $ 1,850,000 $ — Securities sold under repurchase agreements 428,134 448,099 Total $ 2,278,134 $ 448,099 FHLB advances and long-term notes payable —The Company has an available line of credit with the FHLB of Dallas, which allows the Company to borrow on a collateralized basis. The Company’s FHLB advances are typically considered short-term borrowings and are used to manage liquidity as needed. Maturing advances are replaced by drawing on available cash, making additional borrowings or through increased customer deposits. At December 31, 2022 , the Company had total funds of $ 13.75 billion available under this line. FHLB advances of $ 1.85 billion were outstanding at December 31, 2022, with a weighted average interest rate of 4.01 %. At December 31, 2022, the Company had no FHLB long-term notes payable. Securities sold under repurchase agreements with Company customers —At December 31, 2022 , the Company had $ 428.1 million in securities sold under repurchase agreements compared with $ 448.1 million at December 31, 2021 , a decrease of $ 20.0 million or 4.5 %, with weighted average rates paid of 0.58 % and 0.17 % for the years ended December 31, 2022 and 2021 , respectively. Repurchase agreements are generally settled on the following business day; however, approximately $ 4.2 million of repurchase agreements outstanding at December 31, 2022 have maturity dates ranging from 12 to 24 months . All securities sold under repurchase agreements are collateralized by certain pledged securities.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	10. INCOME TAXES The components of income tax expense are as follows: Year Ended December 31, 2022 2021 2020 (Dollars in thousands) Current $ 135,611 $ 117,528 $ 91,314 Deferred 6,046 22,829 24,816 Total $ 141,657 $ 140,357 $ 116,130 The provision for federal income taxes differs from the amount computed by applying the federal income tax statutory rate of 21 % for 2022, 2021 and 2020 to income before income taxes as follows: Year Ended December 31, 2022 2021 2020 (Dollars in thousands) Taxes calculated at statutory rate $ 139,901 $ 138,527 $ 135,457 Increase (decrease) resulting from: Excess FMV on restricted stock vesting 9 84 52 Certain compensation >$ 1 million 948 1,136 615 Nondeductible compensation 945 945 873 Tax-exempt interest ( 1,625 ) ( 1,961 ) ( 2,455 ) Qualified School Construction Bond credit ( 1,288 ) ( 1,369 ) ( 1,453 ) Nontaxable death benefits ( 215 ) ( 192 ) ( 286 ) BOLI income ( 1,075 ) ( 1,098 ) ( 1,208 ) State tax, net 2,315 2,399 2,230 Other, net 1,742 1,886 2,450 Net operating loss carryback — — ( 20,145 ) Total $ 141,657 $ 140,357 $ 116,130 Year-end deferred taxes are presented in the table below. Deferred taxes as of December 31, 2022 and 2021 are based on the U.S. statutory federal corporate income tax rate of 21 %. December 31, 2022 2021 (Dollars in thousands) Deferred tax assets: Loan purchase discounts $ 1,175 $ 2,726 Allowance for credit losses 59,131 60,139 Accrued liabilities 3,002 3,216 Restricted stock 4,844 4,404 CECL unfunded loans 6,289 6,289 Deferred compensation 2,138 2,239 Certificates of Deposit 51 116 Unrealized loss on available for sale securities 923 — Securities 115 81 Other 13 13 Total deferred tax assets 77,681 79,223 Deferred tax liabilities: Goodwill and core deposit intangibles ( 37,006 ) ( 36,998 ) Bank premises and equipment ( 9,482 ) ( 9,370 ) Unrealized gain on available for sale securities — ( 481 ) Prepaid expenses ( 1,475 ) ( 1,500 ) Deferred loan fees and costs ( 11,642 ) ( 8,299 ) Investments in partnerships ( 1,520 ) ( 1,377 ) Total deferred tax liabilities ( 61,125 ) ( 58,025 ) Net deferred tax assets $ 16,556 $ 21,198 The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based upon the level of historical taxable income and estimates of future taxable income over the periods for which the deferred tax assets are deductible, management believes it is more likely than not the Company will realize the benefits of these deductible differences at December 31, 2022. Benefits from tax positions are recognized in the financial statements only when it is more likely than not that the tax position will be sustained upon examination by the appropriate taxing authority that would have full knowledge of all relevant information. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than fifty percent likely of being realized upon ultimate settlement. Tax positions that previously failed to meet the more-likely-than-not recognition threshold are recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more-likely-than-not recognition threshold are derecognized in the first subsequent financial reporting period in which that threshold is no longer met. The Company had no tax positions at December 31, 2022 or December 31, 2021 that did not meet the more-likely-than not recognition threshold. ASC Topic 740 “Income Taxes” also provides guidance on the accounting for and disclosure of unrecognized tax benefits, interest and penalties. The Company’s policy for recording interest and penalties associated with audits is to record such items as a component of income before taxes. Penalties are recorded in other (gains) losses and interest paid or received is recorded in interest expense or interest income, respectively, in the consolidated statement of income. As of December 31, 2022, and 2021, the Company has not accrued any interest and penalties related to unrecognized tax benefits. The Company has identified its federal tax return and its state tax returns in Texas, Oklahoma, Colorado, New Mexico and New York as “major” tax jurisdictions, as defined. The Bank has identified its state returns in Arkansas, Florida, Georgia, Idaho, Pennsylvania, Tennessee and Washington as “major” tax jurisdictions, as defined. The periods subject to examination for the Company’s federal return are the 2018 through 2021 tax years. The Company has assumed net operating loss carryforwards, “acquired NOLs”, through its previous acquisitions. The tax periods of the acquired entities from which these acquired NOLs originated are considered open years for purposes of adjusting the amount of the acquired NOLs used in the Company’s open years. As of December 31, 2022, the Company has fully utilized all acquired NOLs. The CARES Act. The CARES Act, which was enacted in March 2020 in response to the novel strain of coronavirus disease (“COVID-19”) pandemic, permits a five-year carryback period for NOLs, which allowed the Company to generate an anticipated tax refund and income tax benefit resulting from the tax rate differential between the statutory tax rate of 21 % in 2020 and the 35 % statutory tax rate in prior years during the carryback period. Due to the NOL generated in 2019 by LegacyTexas, the Company recorded a current income tax benefit for the year ended December 31, 2020, which was used to offset taxable income generated between 2014 and 2017 that was taxed at 35 %, resulting in a tax benefit of $ 20.1 million. The $ 20.1 million benefit is included in the provision for income taxes in the accompanying condensed consolidated statements of income. This caused a reduction in the effective tax rate during the year ended December 31, 2020. As a result of the NOL carryback, there was a reduction in the Company’s deferred tax assets of $ 30.2 million during the year ended December 31, 2020.

Stock Incentive Programs

Stock Incentive Programs	12 Months Ended
	Dec. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Incentive Programs	11. STOCK INCENTIVE PROGRAMS At December 31, 2022, Bancshares had one active stock-based incentive compensation plan with awards outstanding. The Company accounts for stock-based incentive compensation plans using the fair value-based method of accounting. The Company recognized stock-based compensation expense of $ 11.8 million, $ 12.6 million and $ 12.6 million for the years ended December 31, 2022, 2021 and 2020 , respectively. There was approximately $ 1.5 million, $ 1.4 million and $ 2.0 million of income tax benefit recorded for the stock-based compensation expense for the same periods, respectively. On March 3, 2020, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2020 Stock Incentive Plan (the “2020 Plan”), which was approved by the Bancshares’ shareholders at the annual meeting of shareholders on April 21, 2020. The 2020 Plan authorizes the issuance of up to 2,500,000 shares of common stock upon the exercise of options or pursuant to the grant or exercise, as the case may be, of other awards granted under the 2020 Plan, including incentive stock options, nonqualified stock options, stock appreciation rights, shares of restricted stock and restricted stock units. As of December 31, 2022, 40,593 shares of common stock have been issued pursuant to vested restricted stock awards and 503,732 shares of unvested restricted stock have been granted under the 2020 Plan. On February 22, 2012, Bancshares’ Board of Directors adopted the Prosperity Bancshares, Inc. 2012 Stock Incentive Plan (the “2012 Plan”), which was approved by Bancshares’ shareholders on April 17, 2012. The 2012 Plan authorized the issuance of up to 1,250,000 shares of common stock pursuant to the grant or exercise, as the case may be, of various awards. As of December 31, 2022 , a total of 831,875 shares of common stock had been issued pursuant to vested restricted stock awards and zero shares of unvested restricted stock remained outstanding. The 2012 Plan expired in 2022. Restricted Stock During 2022 and 2021, Bancshares granted shares of restricted stock pursuant to the 2020 Plan. During 2020, Bancshares granted shares of restricted stock under both the 2012 Plan and 2020 Plan. These shares of restricted stock generally vest over a period of one to three years . The Company accounts for restricted stock grants by recording the fair value of the grant as compensation expense over the vesting period. Compensation expense related to restricted stock was $ 11.8 million, $ 12.6 million and $ 12.6 million for the years ended December 31, 2022, 2021 and 2020, respectively. A summary of the status of nonvested shares of restricted stock as of December 31, 2022, and changes during the year then ended is as follows: Number of Shares Weighted Average Grant Date Fair Value (Shares in thousands) Nonvested share awards outstanding, December 31, 2021 498 $ 70.64 Share awards granted 153 72.72 Unvested share awards forfeited ( 28 ) 70.85 Share awards vested ( 119 ) 71.22 Nonvested share awards outstanding, December 31, 2022 504 $ 71.11 The total fair value of restricted stock awards that fully vested during the year ended December 31, 2022 was $ 8.5 million. As of December 31, 2022 , there was $ 17.5 million of total unrecognized compensation expense related to stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 1.43 years.

Other Noninterest Income and Ex

Other Noninterest Income and Expense	12 Months Ended
	Dec. 31, 2022
Text Block [Abstract]
Other Noninterest Income and Expense	12. OTHER NONINTEREST INCOME AND EXPENSE Other noninterest income and expense totals are more fully detailed in the following tables. Any components of these totals exceeding 1% of the aggregate of total net interest income and total noninterest income for any of the years presented, as well as amounts the Company elected to present, are stated separately. Years Ended December 31, 2022 2021 2020 (Dollars in thousands) Other noninterest income Banking related service fees $ 7,943 $ 7,132 $ 6,525 Bank Owned Life Insurance (BOLI) 5,119 5,228 5,754 Rental income 2,279 1,399 1,348 Other 15,042 14,528 15,161 Total $ 30,383 $ 28,287 $ 28,788 Other noninterest expense Advertising $ 3,201 $ 3,179 $ 3,486 Losses 2,610 3,066 3,251 Printing and supplies 3,034 2,563 3,075 Professional and legal fees 8,515 9,515 9,034 Property taxes 9,014 9,257 9,343 Travel and development 6,107 5,243 5,317 Other 14,387 12,865 17,171 Total $ 46,868 $ 45,688 $ 50,677

Profit Sharing Plan

Profit Sharing Plan	12 Months Ended
	Dec. 31, 2022
Compensation And Retirement Disclosure [Abstract]
Profit Sharing Plan	13. PROFIT SHARING PLAN The Company has adopted a profit sharing plan pursuant to Section 401(k) of the Internal Revenue Code (the “Code”), whereby the participants may contribute a percentage of their compensation as permitted under the Code. Matching contributions are made at the discretion of the Company. Presently, the Company matches 50 % of an employee’s contributions, up to 15 % of such employee’s compensation, not to exceed the maximum allowable pursuant to the Code and excluding catch-up contributions. Such matching contributions were approximately $ 6.4 million, $ 7.2 million and $ 7.4 million for the years ended December 31, 2022, 2021 and 2020 , respectively.

Off-Balance Sheet Arrangements,

Off-Balance Sheet Arrangements, Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Off Balance Sheet Arrangements Commitments And Contingencies [Abstract]
Off-Balance Sheet Arrangements, Commitments and Contingencies	14. OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES The Company’s contractual obligations and other commitments to make future payments (other than deposit obligations and securities sold under repurchase agreements) as of December 31, 2022 are summarized below. Federal Home Loan Bank Borrowings The Company’s future cash payments associated with its contractual obligations pursuant to its FHLB advances as of December 31, 2022 are summarized below. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Federal Home Loan Bank advances $ 1,850,000 $ — $ — $ — $ 1,850,000 Off-Balance Sheet Items In the normal course of business, the Company enters into various transactions that, in accordance with GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company’s commitments associated with outstanding standby letters of credit, unused capacity on Warehouse Purchase Program loans and commitments to extend credit expiring by period as of December 31, 2022 are summarized below. Since commitments associated with letters of credit, unused capacity of Warehouse Purchase Program loans and commitments to extend credit may expire unused, the amounts shown may not necessarily reflect the actual future cash funding requirements. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Standby letters of credit $ 56,019 $ 5,529 $ 2,469 $ — $ 64,017 Unused capacity on Warehouse Purchase Program loans 1,442,380 — — — 1,442,380 Commitments to extend credit 1,700,290 1,224,419 457,793 1,989,782 5,372,284 Total $ 3,198,689 $ 1,229,948 $ 460,262 $ 1,989,782 $ 6,878,681 Standby Letters of Credit. Standby letters of credit are written conditional commitments issued by the Company to guarantee the payment by or performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment is funded, the Company would be entitled to seek recovery from the customer. The Company’s policies generally require that standby letter of credit arrangements contain security and debt covenants similar to those contained in loan agreements. Unused Capacity on Warehouse Purchase Program Loans. For Warehouse Purchase Program loans, the Company has established maximum purchase facility amounts, but reserves the right, at any time, to refuse to buy any mortgage loans offered for sale by each customer, for any reason. Commitments to Extend Credit. The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of the Company’s commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. The Company minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures. Management assesses the credit risk associated with certain commitments to extend credit in determining the level of the allowance for credit losses. At December 31, 2022, $ 707.8 million of commitments to extend credit and standby letters of credit have fixed rates ranging from 0 % to 21.0 %. The Company evaluates customer creditworthiness on a case-by-case basis. The amount of collateral obtained, if considered necessary by the Company upon extension of credit, is based on management’s credit evaluation of the customer. Allowance for Credit Losses on Off-Balance Sheet Credit Exposures. The Company records an allowance for credit losses on off-balance sheet credit exposure that is adjusted through a charge to provision for credit losses on the Company’s consolidated statement of income. At December 31, 2022 and 2021 , this allowance, reported as a separate line item on the Company’s consolidated balance sheet, totaled $ 29.9 million. Leases The Company’s leases relate primarily to operating leases for office space and banking centers. The Company determines if an arrangement is a lease or contains a lease at inception. The Company’s leases have remaining lease terms of 1 to 16 years , which may include the option to extend the lease when it is reasonably certain for the Company to exercise that option. Operating lease right-of-use (“ROU”) assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. The Company uses its incremental collateralized borrowing rate to determine the present value of lease payments. Short-term leases and leases with variable lease costs are immaterial and the Company has one sublease arrangement. Sublease income for the years ended December 31, 2022, 2021 , 2020 was $ 3.2 million, $ 3.1 million and $ 660 thousand, respectively. As of December 31, 2022 , operating lease ROU assets and lease liabilities were approximately $ 41.8 million. ROU assets and lease liabilities were classified as other assets and other liabilities , respectively. As of December 31, 2022 , the weighted average remaining lease terms of the Company’s operating leases were 5.5 years. The weighted average discount rate used to determine the lease liabilities as of December 31, 2022 for the Company’s operating leases was 2.26 %. Cash paid for the Company’s operating leases for the year ended December 31, 2022 and 2021 was $ 10.9 million and $ 12.2 million, respectively. During the year ended December 31, 2022 , the Company obtained $ 1.9 million in ROU assets in exchange for lease liabilities for 5 operating leases. The Company’s future undiscounted cash payments associated with its operating leases as of December 31, 2022 are summarized below (dollars in thousands). 2023 $ 10,311 2024 9,500 2025 8,931 2026 7,916 2027 5,028 Thereafter 6,869 Total undiscounted lease payments $ 48,555 It is expected that in the normal course of business, expiring leases will be renewed or replaced by leases on other property or equipment. Rent expense under all operating lease obligations aggregated approximately $ 10.9 million for the year ended December 31, 2022 , $ 11.6 million for the year ended December 31, 2021 and $ 13.7 million for the year ended December 31, 2020. Litigation —The Company and the Bank are defendants, from time to time, in legal actions arising from transactions conducted in the ordinary course of business. After consultations with legal counsel, the Company and the Bank believe that the ultimate liability, if any, arising from such actions will not have a material adverse effect on their financial statements.

Other Comprehensive Income

Other Comprehensive Income	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Other Comprehensive Income	15. OTHER COMPREHENSIVE INCOME For the Years Ended December 31, 2022 2021 2020 Before Tax Net of Before Tax Net of Before Tax Net of (Dollars in thousands) Other comprehensive (loss) income: Securities available for sale: Change in unrealized (loss) gain during period $ ( 6,686 ) $ 1,404 $ ( 5,282 ) $ 1,316 $ ( 276 ) $ 1,040 $ 212 $ ( 45 ) $ 167 Total securities available for sale ( 6,686 ) 1,404 ( 5,282 ) 1,316 ( 276 ) 1,040 212 ( 45 ) 167 Total other comprehensive (loss) income $ ( 6,686 ) $ 1,404 $ ( 5,282 ) $ 1,316 $ ( 276 ) $ 1,040 $ 212 $ ( 45 ) $ 167 Activity in accumulated other comprehensive income, net of tax, was as follows: Securities Accumulated (Dollars in thousands) Balance at January 1, 2022 $ 1,809 $ 1,809 Other comprehensive loss ( 5,282 ) ( 5,282 ) Balance at December 31, 2022 $ ( 3,473 ) $ ( 3,473 ) Balance at January 1, 2021 $ 769 $ 769 Other comprehensive income 1,040 1,040 Balance at December 31, 2021 $ 1,809 $ 1,809 Balance at January 1, 2020 $ 602 $ 602 Other comprehensive income 167 167 Balance at December 31, 2020 $ 769 $ 769

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2022
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	16. DERIVATIVE FINANCIAL INSTRUMENTS The following table provides the outstanding notional balances and fair values of outstanding derivative positions at December 31, 2022 and 2021. December 31, 2022 December 31, 2021 Outstanding Asset Liability Outstanding Asset Liability (Dollars in thousands) Interest rate lock commitments $ 4,599 $ 94 $ 6 $ 8,411 $ 237 $ — Forward mortgage-backed securities trades 5,250 31 — 22,250 18 18 Commercial loan interest rate swaps and caps: Loan customer counterparty 93,214 — 5,522 198,683 4,124 — Financial institution counterparty 93,214 5,522 — 198,683 — 4,124 These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers’ financing needs. All derivatives are carried at fair value in either other assets or other liabilities. Interest rate lock commitments (“IRLCs”) — In the normal course of business, the Company enters into interest rate lock commitments with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. Forward mortgage-backed securities trades — The Company manages the changes in fair value associated with changes in interest rates related to IRLCs by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the interest rate lock commitment is made. Interest rate swaps and caps — These derivative positions relate to transactions in which the Company enters into an interest rate swap or cap with a customer, while at the same time entering into an offsetting interest rate swap or cap with another financial institution. An interest rate swap transaction allows the Company’s customer to effectively convert a variable rate loan to a fixed rate. In connection with each swap, the Company agrees to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. In connection with each interest rate cap, the Company sells a cap to the customer and agree to pay interest if the underlying index exceeds the strike price defined in the cap agreement. Simultaneously the Company purchases a cap with matching terms from another financial institution that agrees to pay the Company if the underlying index exceeds the strike price. The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at December 31, 2022 and 2021 are presented in the following table. Weighted-Average Interest Rate December 31, 2022 December 31, 2021 Received Paid Received Paid Loan customer counterparty 3.05 % 5.18 % 2.64 % 0.80 % The Company’s credit exposure on interest rate swaps is limited to the net favorable value of all swaps by each counterparty, which was approximately $ 5.5 million and $ 4.1 million at December 31, 2022 and 2021 , respectively. This credit exposure is partly mitigated as transactions with customers are secured by the collateral, if any, securing the underlying transaction being hedged. The Company’s credit exposure, net of collateral pledged, relating to interest rate swaps with upstream financial institution counter-parties was $ 562 thousand at December 31, 2022 . A credit support annex is in place and allows the Company to call collateral from upstream financial institution counter-parties. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap values. The Company’s cash collateral pledged for interest rate swaps was zero and $ 4.3 million at December 31, 2022 and 2021, respectively. The initial and subsequent changes in the fair value of IRLCs and the forward sales of mortgage-backed securities are recorded in net gain on sale of mortgage loans. These gains and losses were not attributable to instrument-specific credit risk. For interest rate swaps and caps, because the Company acts as an intermediary for its customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on its results of operations. Income (loss) for the years ended December 31, 2022, 2021 and 2020 was as follows: Year Ended December 31, Derivatives not designated as hedging instruments 2022 2021 2020 Interest rate lock commitments $ 88 $ 237 $ ( 305 ) Forward mortgage-backed securities trades 740 181 ( 2,398 )

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2022
Banking And Thrift Disclosure [Abstract]
Regulatory Matters	17. REGULATORY MATTERS The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Any institution that fails to meet its minimum capital requirements is subject to actions by regulators that could have a direct material effect on the Company’s financial statements. Under the capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines based on 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 the Bank’s classification under the regulatory framework for prompt corrective action are also subject to qualitative judgments by the regulators about the components, risk weightings and other factors. The Basel III Capital Rules adopted by the federal regulatory authorities in 2013 substantially revised the risk-based capital requirements applicable to the Company and the Bank. The Basel III Capital Rules became effective for the Company and the Bank on January 1, 2015, subject to a phase-in period for certain provisions. Among other things, the Basel III Capital Rules introduced a new capital measure called “Common Equity Tier 1” (“CET1”), which is a comparison of the sum of certain equity capital components to total risk-weighted assets, and revised the risk-weighting approach of the capital ratios with a more risk-sensitive approach that expanded the risk-weighting categories from the previous Basel I derived categories to a much larger and more risk-sensitive number of categories, depending on the nature of the assets. In response to the COVID-19 pandemic, in March 2020 the joint federal bank regulatory agencies issued an interim final rule that allowed banking organizations that implemented CECL in 2020 to mitigate the effects of the CECL accounting standard in their regulatory capital for two years. This two-year delay is in addition to the three-year transition period that the agencies had already made available. The Company adopted the option provided by the interim final rule, which delayed the effects of CECL on its regulatory capital through 2021, after which the effects will be phased in over a three-year period from January 1, 2022 through December 31, 2024. Under the interim final rule, the amount of adjustments to regulatory capital deferred until the phase-in period include both the initial impact of the Company’s adoption of CECL on January 1, 2020 and 25 % of subsequent changes in the Company’s allowance for credit losses during each quarter of the two-year period ending December 31, 2021. The cumulative amount of the transition adjustments is being phased in over the three-year transition period that began on January 1, 2022, with 75 % recognized in 2022, 50 % recognized in 2023, and 25 % recognized in 2024. To meet the capital adequacy requirements, the Company and the Bank must maintain minimum capital amounts and ratios of CET1, Tier 1 and Total capital to risk weighted assets, and of Tier 1 capital to adjusted quarterly average assets as defined in the regulations. As of December 31, 2022, the Company and the Bank met all capital adequacy requirements to which they were subject. Since being fully phased in on January 1, 2019, the Basel III Capital Rules require the Company to maintain a capital conservation buffer, composed entirely of CET1, of 2.5%, effectively resulting in minimum ratios of (1) CET1 to risk-weighted assets of 7.0 %, (2) Tier 1 capital to risk-weighted assets of 8.5 %, (3) total capital (that is, Tier 1 plus Tier 2) to risk-weighted assets of 10.5 % and (4) Tier 1 capital to average quarterly assets as reported on consolidated financial statements ( known as the “leverage ratio”) of 4.0 %. The CET1, Tier 1 and total capital ratios are calculated by dividing the respective capital amounts by risk weighted assets. Risk weighted assets include total assets, excluding goodwill and other intangible assets, allocated by risk weight category, and certain off-balance-sheet items. The leverage ratio is calculated by dividing Tier 1 capital by adjusted quarterly average total assets, excluding goodwill and other intangible assets. As of December 31, 2022, the most recent notification from the FDIC categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. There have been no conditions or events since that notification which management believes have changed the Bank’s category. To be categorized as well capitalized the Bank must maintain minimum CET1 risk-based, Tier 1 risk-based, total risk-based and Tier 1 leverage ratios as set forth in the table below. The following is a summary of the Company’s and the Bank’s capital ratios at December 31, 2022 and 2021: Actual Minimum Required For Capital Adequacy Purposes Minimum Required Plus Capital Conservation Buffer To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) CONSOLIDATED: As of December 31, 2022 CET1 Capital (to Risk Weighted Assets) $ 3,498,958 15.88 % $ 991,669 4.50 % $ 1,542,597 7.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 3,498,958 15.88 1,322,226 6.00 1,873,153 8.50 N/A N/A Total Capital (to Risk Weighted Assets) 3,638,419 16.51 1,762,968 8.00 2,313,895 10.50 N/A N/A Tier 1 Capital (to Average Tangible Assets) 3,498,958 10.16 1,377,930 4.00 1,377,930 4.00 N/A N/A As of December 31, 2021 CET1 Capital (to Risk Weighted Assets) $ 3,249,915 15.10 % $ 968,788 4.50 % $ 1,507,004 7.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 3,249,915 15.10 1,291,718 6.00 1,829,933 8.50 N/A N/A Total Capital (to Risk Weighted Assets) 3,325,703 15.45 1,722,290 8.00 2,260,506 10.50 N/A N/A Tier 1 Capital (to Average Tangible Assets) 3,249,915 9.62 1,351,272 4.00 1,351,272 4.00 N/A N/A BANK ONLY: As of December 31, 2022 CET1 Capital (to Risk Weighted Assets) $ 3,486,720 15.83 % $ 991,380 4.50 % $ 1,542,147 7.00 % $ 1,431,994 6.50 % Tier 1 Capital (to Risk Weighted Assets) 3,486,720 15.83 1,321,840 6.00 1,872,607 8.50 1,762,454 8.00 Total Capital (to Risk Weighted Assets) 3,626,184 16.46 1,762,454 8.00 2,313,221 10.50 2,203,067 10.00 Tier 1 Capital (to Average Tangible Assets) 3,486,720 10.12 1,377,765 4.00 1,377,765 4.00 1,722,207 5.00 As of December 31, 2021 CET1 Capital (to Risk Weighted Assets) $ 3,235,504 15.03 % $ 968,411 4.50 % $ 1,506,418 7.00 % $ 1,398,816 6.50 % Tier 1 Capital (to Risk Weighted Assets) 3,235,504 15.03 1,291,215 6.00 1,829,222 8.50 1,721,620 8.00 Total Capital (to Risk Weighted Assets) 3,311,292 15.39 1,721,620 8.00 2,259,627 10.50 2,152,025 10.00 Tier 1 Capital (to Average Tangible Assets) 3,235,504 9.58 1,350,820 4.00 1,350,820 4.00 1,688,525 5.00 Dividends paid by Bancshares and the Bank are subject to restrictions by certain regulatory agencies. Dividends declared to be paid by Bancshares during the years ended December 31, 2022, 2021 and 2020 were $ 193.1 million, $ 184.3 million and $ 173.8 million, respectively. Dividends paid by the Bank to Bancshares during the years ended December 31, 2022, 2021 and 2020 were $ 256.7 million, $ 229.1 million and $ 351.2 million, respectively.

Parent Company Only Financial S

Parent Company Only Financial Statements	12 Months Ended
	Dec. 31, 2022
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Statements	8. PARENT COMPANY ONLY FINANCIAL STATEMENTS PROSPERITY BANCSHARES, INC. (Parent Company Only) CONDENSED BALANCE SHEETS December 31, 2022 2021 (Dollars in thousands) ASSETS Cash $ 3,890 $ 3,548 Investment in subsidiary 6,683,154 6,408,843 Goodwill 3,982 3,982 Other assets 8,348 10,863 TOTAL $ 6,699,374 $ 6,427,236 LIABILITIES AND SHAREHOLDERS’ EQUITY LIABILITIES: Accrued interest payable and other liabilities $ — $ — Subordinated notes — — Total liabilities — — SHAREHOLDERS’ EQUITY: Common stock 91,314 92,170 Capital surplus 3,541,924 3,595,024 Retained earnings 3,069,609 2,738,233 Unrealized (loss) gain on available for sale securities, net of tax ( 3,473 ) 1,809 Total shareholders’ equity 6,699,374 6,427,236 TOTAL $ 6,699,374 $ 6,427,236 PROSPERITY BANCSHARES, INC. (Parent Company Only) CONDENSED STATEMENTS OF INCOME For the Years Ended December 31, 2022 2021 2020 (Dollars in thousands) OPERATING INCOME: Dividends from subsidiary $ 256,721 $ 229,088 $ 351,213 Other income 8 14 22 Total income 256,729 229,102 351,235 OPERATING EXPENSE: Subordinated notes and trust preferred interest expense — — 5,498 Stock based compensation expense (includes restricted stock) 11,765 12,572 12,607 Other expenses 1,968 1,993 1,495 Total operating expense 13,733 14,565 19,600 INCOME BEFORE INCOME TAX BENEFIT AND EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES 242,996 214,537 331,635 FEDERAL INCOME TAX BENEFIT 1,927 1,886 7,202 INCOME BEFORE EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES 244,923 216,423 338,837 EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES 279,593 302,874 190,067 NET INCOME $ 524,516 $ 519,297 $ 528,904 PROSPERITY BANCSHARES, INC. (Parent Company Only) CONDENSED STATEMENTS OF COMPREHENSIVE INCOME For the Years Ended December 31, 2022 2021 2020 (Dollars in thousands) Net income $ 524,516 $ 519,297 $ 528,904 Other comprehensive (loss) income, before tax: Securities available for sale: Change in unrealized (losses) gains during the period ( 6,686 ) 1,316 212 Total other comprehensive (loss) income ( 6,686 ) 1,316 212 Deferred tax benefit (expense) related to other comprehensive (loss) income 1,404 ( 276 ) ( 45 ) Other comprehensive (loss) income, net of tax ( 5,282 ) 1,040 167 Comprehensive income $ 519,234 $ 520,337 $ 529,071 PROSPERITY BANCSHARES, INC. (Parent Company Only) CONDENSED STATEMENTS OF CASH FLOWS For the Years Ended December 31, 2022 2021 2020 (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income $ 524,516 $ 519,297 $ 528,904 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries ( 279,593 ) ( 302,874 ) ( 190,067 ) Stock based compensation expense (includes restricted stock) 11,765 12,572 12,607 Decrease (increase) in other assets 2,515 3,649 ( 1,667 ) Decrease in accrued interest payable and other liabilities — — ( 1,987 ) Net cash provided by operating activities 259,203 232,644 347,790 CASH FLOWS FROM INVESTING ACTIVITIES: Cash paid for acquisitions — — — Net cash used in investing activities — — — CASH FLOWS FROM FINANCING ACTIVITIES: Redemption of junior subordinated debentures — — ( 125,000 ) Repurchase of common stock ( 65,721 ) ( 52,089 ) ( 115,161 ) Payments of cash dividends ( 193,140 ) ( 184,253 ) ( 173,823 ) Net cash used in financing activities ( 258,861 ) ( 236,342 ) ( 413,984 ) NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 342 ( 3,698 ) ( 66,194 ) CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 3,548 7,246 73,440 CASH AND CASH EQUIVALENTS, END OF PERIOD $ 3,890 $ 3,548 $ 7,246

Nature of Operations and Summ_2

Nature of Operations and Summary of Significant Accounting and Reporting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations	Nature of Operations —Prosperity Bancshares, Inc. ® (“Bancshares”) and its subsidiary, Prosperity Bank ® (the “Bank”, collectively referred to as the “Company”), provide retail and commercial banking services. As of December 31, 2022 , the Bank operated 272 full-service banking locations: 65 in the Houston area, including The Woodlands; 30 in the South Texas area including Corpus Christi and Victoria; 62 in the Dallas/Fort Worth, Texas area; 22 in the East Texas area; 29 in the Central Texas area, including Austin and San Antonio; 34 in the West Texas area, including Lubbock, Midland-Odessa and Abilene; 16 in the Bryan/College Station area; 6 in the Central Oklahoma area; and 8 in the Tulsa, Oklahoma area.
Summary of Significant Accounting and Reporting Policies	Summary of Significant Accounting and Reporting Policies —The accounting and reporting policies of the Company conform to generally accepted accounting principles (“GAAP”) and the prevailing practices within the financial services industry. A summary of significant accounting and reporting policies are as follows:
Basis of Presentation	Basis of Presentation —The consolidated financial statements include the accounts of Bancshares and its subsidiaries. Intercompany transactions have been eliminated in consolidation. Operations are managed and financial performance is evaluated on a company-wide basis. Accordingly, all of the Company’s banking operations are considered by management to be aggregated in one reportable operating segment. Because the overall banking operations comprise the vast majority of the consolidated operations, no separate segment disclosures are presented.
Use of Estimates	Use of Estimates —The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Such estimates include, but are not limited to certain fair value measures including the calculation of stock-based compensation, the valuation of goodwill and available for sale and held to maturity securities and the calculation of allowance for credit losses. Actual results could differ from these estimates.
Business Combinations	Business Combinations — Generally, acquisitions are accounted for under the acquisition method of accounting in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 805, Business Combinations. A business combination occurs when the Company acquires net assets that constitute a business and obtains control over that business. Business combinations are effected through the transfer of consideration consisting of cash and/or common stock and are accounted for using the acquisition method. Accordingly, the assets and liabilities of the acquired business are recorded at their respective fair values at the acquisition date. Determining the fair value of assets and liabilities, especially the loan portfolio, is a process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. Fair values are subject to refinement for up to one year after the closing date of the acquisition as information relative to closing date fair values becomes available. The results of operations of an acquired entity are included in the Company’s consolidated results from acquisition date, and prior periods are not restated.
Securities	Securities —The investment securities portfolio is measured for expected credit losses by segregating the portfolio into two general segments and applying the appropriate expected credit losses methodology. Investment securities classified as available for sale or held to maturity are evaluated for expected credit losses under FASB ASC 326, “ Financial Instruments – Credit Losses .” Securities held to maturity are carried at cost, adjusted for the amortization of premiums and the accretion of discounts. Management has the positive intent and the Company has the ability to hold these assets until their estimated maturities. Securities available for sale are carried at fair value. Unrealized gains and losses are excluded from earnings and reported, net of tax, as a separate component of shareholders’ equity until realized. Securities within the available for sale portfolio may be used as part of the Company’s asset/liability strategy and may be sold in response to changes in interest rate risk, prepayment risk or other similar economic factors. For available for sale securities in an unrealized loss position, the amount of the expected credit losses recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the expected credit losses will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the expected credit losses will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total expected credit losses related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis, and such difference is recognized in earnings. The amount of the total expected credit losses related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the expected credit losses recognized in earnings will become the new amortized cost basis of the investment. Premiums and discounts are amortized and accreted to operations using the level-yield method of accounting, adjusted for prepayments as applicable. The specific identification method of accounting is used to compute gains or losses on the sales of these assets. Interest earned on these assets is included in interest income.
Loans Held for Sale	Loans Held for Sale —Loans held for sale are carried at the lower of cost or market value. Premiums, discounts and loan fees (net of certain direct loan origination costs) on loans held for sale are deferred until the related loans are sold or repaid. Gains or losses on loan sales are recognized at the time of sale and determined using the specific identification method.
Loans Held for Investment	Loans Held for Investment —Loans originated and held for investment are stated at the principal amount outstanding, net of unearned fees. The related interest income for multi-payment loans is recognized principally by the simple interest method; for single payment loans, such income is recognized using the straight-line method. The Company has two general categories of loans in its portfolio. Loans originated by the Bank and made pursuant to the Company’s loan policy and procedures in effect at the time the loan was made are referred to as “originated loans” and loans acquired in a business combination are referred to as “acquired loans.” Acquired loans are initially recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected default rates, loss given default and recovery rates, with no carryover of any existing allowance for credit losses. Those acquired loans that are renewed or substantially modified after the date of the business combination are referred to as “re-underwritten acquired loans.” Modifications are reviewed for determination of troubled debt restructuring status independently of this process. In certain instances, acquired loans to one borrower may be combined or otherwise re-originated such that they are re-categorized as originated loans. Acquired loans with a fair value discount or premium at the date of the business combination that remained at the reporting date are referred to as “fair-valued acquired loans.” All fair-valued acquired loans are further categorized into “Non-PCD loans” and “PCD loans” (purchased credit deteriorated loans). Acquired loans with evidence of more than insignificant credit quality deterioration as of the acquisition date when compared to the origination date are classified as PCD loans. The Company estimates the total cash flows expected to be collected from the PCD loans, which include undiscounted expected principal and interest, using credit risk, interest rate and prepayment risk assessments that incorporate management’s best estimate of current key assumptions such as default rates, loss severity and payment speeds. The excess of the undiscounted total cash flows expected to be collected over the fair value of the related PCD loans represents the accretable yield, which is recognized as interest income based on future cash flows, taking into account contractual maturities. The difference between the undiscounted contractual principal and interest and the undiscounted total cash flows expected to be collected is the PCD specific reserve, which is included in the allowance for credit losses. Subsequent increases in expected cash flows will result in a recovery of any previously recorded allowance for credit losses, to the extent applicable. Subsequent decreases in expected cash flows will result in an impairment charge to the provision for credit losses, resulting in an addition to the allowance for credit losses. A loan disposal, which may include a loan sale, receipt of payment in full from the borrower or foreclosure, results in removal of the loan from the balance sheet at its allocated carrying amount and accretion of any remaining fair value discount to income.
Warehouse Purchase Program Loans	Warehouse Purchase Program Loans —All Warehouse Purchase Program loans are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. These safeguards include the requirement that the mortgage originator clients have a takeout commitment or similar arrangement for each loan. To date, the Company has not experienced a loss on these loans and no allowance for credit losses has been allocated to them.
Nonrefundable Fees and Costs Associated with Lending Activities	Nonrefundable Fees and Costs Associated with Lending Activities —Loan origination fees in excess of the associated costs are recognized over the life of the related loan as an adjustment to yield using the interest method. Loan commitment fees and loan origination costs are deferred and recognized as an adjustment of yield by the interest method over the related loan life or, if the commitment expires unexercised, recognized in income upon expiration of the commitment.
Nonperforming and Past Due Loans	Nonperforming and Past Due Loans — Included in the nonperforming loan category are loans which have been categorized by management as nonaccrual because collection of interest is doubtful and loans which have been restructured through a troubled debt restructuring to provide a reduction in the interest rate or a deferral of interest or principal payments. The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases, unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan. If the decision is made to continue accruing interest on the loan, periodic reviews are made to confirm the accruing status of the loan. When a loan is placed on nonaccrual status, interest accrued but not yet collected prior to the determination as uncollectible is charged to operations. Interest accrued during prior periods is charged to the allowance for credit losses. Any payments received on nonaccrual loans are applied first to outstanding principal of the loan amount, next to the recovery of charged-off loan amounts and finally, any excess is treated as recovery of lost interest. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured, which is typically evidenced by a sustained period (at least six months) of repayment performance by the borrower. Restructured loans are those loans on which concessions in terms have been granted because of a borrower’s financial difficulty. Interest is generally not accrued on such loans in accordance with the new terms.
Allowance for Credit Losses	Allowance for Credit Losses — The allowance for credit losses is accounted for in accordance with ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments” (“CECL”) which replaced the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss methodology. CECL requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is an allowance available for losses on loans and held-to-maturity securities. All losses are charged to the allowance when the loss actually occurs or when a determination is made that such a loss is likely and can be reasonably estimated. Recoveries are credited to the allowance at the time of recovery. Throughout the year, management estimates the level of lifetime losses to determine whether the allowance for credit losses is adequate to absorb losses in the loan portfolio. Based on these estimates, an amount is charged to the provision for credit losses and credited to the allowance for credit losses in order to adjust the allowance to a level determined to be adequate to absorb losses. In making its evaluation, management considers factors such as historical lifetime loan loss experience, the amount of nonperforming assets and related collateral, the volume, growth and composition of the portfolio, current economic conditions and reasonable and supportable forecasted economic conditions that may affect borrower ability to pay and the value of collateral, the evaluation of the portfolio through its internal loan review process and other relevant factors. Estimates of credit losses involve an exercise of judgment. While it is possible that in the short term the Company may sustain losses which are substantial in relation to the allowance for credit losses, it is the judgment of management that the allowance for credit losses reflected in the consolidated balance sheets is adequate to absorb expected lifetime losses that may be realized from the loan portfolio as of December 31, 2022. The Company’s allowance for credit losses consists of two elements: (1) specific valuation allowances based on expected losses on impaired loans and PCD loans; and (2) a general valuation allowance based on historical lifetime loan loss experience, current economic conditions, reasonable and supportable forecasted economic conditions, and other qualitative risk factors both internal and external to the Company. Non-PCD loans that have deteriorated to an impaired status subsequent to acquisition are evaluated for a specific reserve on a quarterly basis which, when identified, is added to the allowance for credit losses. The Company reviews impaired Non-PCD loans on a loan-by-loan basis and determines the specific reserve based on the difference between the recorded investment in the loan and one of three factors: expected future cash flows, observable market price or fair value of the collateral. Because essentially all of the Company’s impaired Non-PCD loans have been collateral-dependent, the amount of the specific reserve historically has been determined by comparing the fair value of the collateral securing the Non-PCD loan with the recorded investment in such loan. In the future, the Company will continue to analyze impaired Non-PCD loans on a loan-by-loan basis and may use an alternative measurement method to determine the specific reserve, as appropriate and in accordance with applicable accounting standards. PCD loans are individually monitored on a quarterly basis to assess for changes in expected cash flows subsequent to acquisition. If a deterioration in cash flows is identified, an increase to the specific reserve for that loan is made. PCD loans were recorded at their acquisition date fair values, which were based on expected cash flows and considers estimates of expected future credit losses. The Company’s estimates of loan fair values at the acquisition date may be adjusted for a period of up to one year as the Company continues to evaluate its estimate of expected future cash flows at the acquisition date. If the Company determines that losses arose after the acquisition date, the additional losses will be reflected as a provision for credit losses.
Accounting for Acquired Loans and the Allowance for Acquired Credit Losses	Accounting for Acquired Loans and the Allowance for Acquired Credit Losses — The Company accounts for its acquisitions using the acquisition method of accounting. Accordingly, the assets, including loans, and liabilities of the acquired entity were recorded at their fair values at the acquisition date. These fair value estimates associated with acquired loans, and based on a discounted cash flow model, include estimates related to market interest rates and undiscounted projections of future cash flows that incorporate expectations of prepayments and the amount and timing of principal, interest and other cash flows, as well as any shortfalls thereof. For further discussion of the Company’s acquisition and loan accounting, see Note 5 to the consolidated financial statements.
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures	Allowance for Credit Losses on Off-Balance Sheet Credit Exposures — The allowance for credit losses on off-balance sheet credit exposures estimates expected credit losses over the contractual period in which there is exposure to credit risk via a contractual obligation to extend credit, except when an obligation is unconditionally cancellable by the Company. The allowance is adjusted by provisions for credit losses charged to earnings that increase the allowance, or by provision releases returned to earnings that decrease the allowance. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on the commitments expected to fund. The estimate of commitments expected to fund is affected by historical analysis of utilization rates. The expected credit loss rates applied to the commitments expected to fund are affected by the general valuation allowance utilized for outstanding balances with the same underlying assumptions and drivers.
Premises and Equipment	Premises and Equipment —Premises and equipment are carried at cost less accumulated depreciation. Depreciation expense is computed principally using the straight-line method over the estimated useful lives of the assets which range from one to 39 years . Leasehold improvements are amortized using the straight-line method over the periods of the leases or the estimated useful lives, whichever is shorter.
Derivative Financial Instruments	Derivative Financial Instruments —The Company has interest rate swaps with certain commercial customers who wished to obtain a loan at a fixed rate. The Company enters into an interest rate swap with the customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each swap transaction, the Company agrees to pay interest to the borrowing customer on a notional amount at a variable interest rate and receives interest from the customer on the same notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows the customer to effectively convert a variable-rate loan to a fixed-rate. Because the Company acts solely as an intermediary for its customer, changes in the fair value of the underlying derivative contracts offset each other and do not significantly impact the Company’s results of operations. The Company has interest rate lock commitments and forward mortgage-backed securities trades. In the normal course of business, the Company enters into interest rate lock commitments with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. The Company manages the changes in fair value associated with changes in interest rates related to interest rate lock commitments by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the interest rate lock commitment is made. These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers’ financing needs. All derivatives are carried at fair value in either other assets or other liabilities.
Goodwill	Goodwill —Goodwill is annually assessed for impairment or when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. Under ASC Topic 350-20, “Intangibles—Goodwill and Other—Goodwill” companies have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining the need to perform step one of the annual test for goodwill impairment. An entity has an unconditional option to bypass the qualitative assessment described in the following paragraph for any reporting unit in any period and proceed directly to performing the first step of the goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. If the estimated fair value of the reporting unit exceeds its carrying value, goodwill of the reporting unit is not impaired.
Amortization of Core Deposit Intangibles	Amortization of Core Deposit Intangibles —Core deposit intangibles are being amortized on a non-pro rata basis over an estimated life of 10 to 15 years .
Income Taxes	Income Taxes — The Company files a consolidated federal income tax return and consolidated state returns in Oklahoma, Colorado, New Mexico and New York. For the year ended December 31, 2022, the Bank will also file state returns in Arkansas, Florida, Georgia, Idaho, Pennsylvania, Tennessee and Washington. In addition, the Company files a Combined Texas Franchise Tax Report. Deferred tax assets and liabilities are recognized for the estimated tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and are recorded net to other assets on the Company’s consolidated balance sheets. The Company records uncertain tax positions in accordance with ASC Topic 740 “ Income Taxes ” on the basis of a two-step process whereby (1) the Company determines whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. Realization of net deferred tax assets is based upon the level of historical income and on estimates of future taxable income. Although realization is not assured, management believes it is more likely than not that all of the net deferred tax assets will be realized.
Stock-Based Compensation	Stock-Based Compensation —The Company accounts for stock-based employee compensation plans using the fair value-based method of accounting. The expense associated with stock-based compensation is recognized over the vesting period of each individual arrangement. The fair value of restricted stock awards is based on the current market price on the date of grant.
Cash and Cash Equivalents	Cash and Cash Equivalents —For purposes of reporting cash flows, cash and cash equivalents include cash and due from banks as well as federal funds sold that mature in three days or less.
Earnings Per Common Share	Earnings Per Common Share —Basic earnings per common share are calculated using the two-class method. The two-class method provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of basic earnings per share. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock using the treasury stock method. The following table illustrates the computation of basic and diluted earnings per share: Year Ended December 31, 2022 2021 2020 Amount Per Share Amount Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 524,516 $ 519,297 $ 528,904 Basic: Weighted average shares outstanding 91,604 $ 5.73 92,657 $ 5.60 93,058 $ 5.68 Diluted: Add incremental shares for: Effect of dilutive securities - options — — — Total $ 91,604 $ 5.73 $ 92,657 $ 5.60 $ 93,058 $ 5.68 As of December 31, 2022, all stock options have been exercised and there are no options outstanding. There were no stock options exercisable at December 31, 2022, 2021 and 2020 that would have had an anti-dilutive effect on the above computation.
New Accounting Standards	New Accounting Standards Accounting Standards Updates (“ASU”) ASU 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the accounting guidance for troubled debt restructurings and requires entities to evaluate all loan modifications to determine if they result in a new loan or a continuation of an existing loan. Additionally, ASU 2022-02 requires entities to disclose current-period gross charge-offs by year of origination. ASU 2022-02 will be effective for the Company on January 1, 2023 and is not expected to have a significant impact on the Company’s financial statements. ASU 2020-04, Reference Rate Reform: Facilitation of the Effects of Reference Rate Reform on Financial Reporting – ASC Topic 848. ASU 2020-04 became effective for the Company on January 1, 2022 and provides optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. ASU 2020-04 was effective upon issuance. In addition, the FASB issued ASU 2022-06 - Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 , which extends the period of time preparers can utilize the reference rate reform relief guidance provided by ASU 2020-04 from December 31, 2022 to December 31, 2024. ASU 2022-06 was effective upon issuance and did not change the core principles in ASU 2020-04. Prior to the end of 2021, the Company began transitioning away from LIBOR to Secured Overnight Financing Rate (“SOFR”) or other alternative variable rate indexes for its interest-rate swaps and loans historically using LIBOR as an index. As of December 31, 2022 and 2021, LIBOR was used as an index rate for the Company’s interest-rate swaps and approximately 1.5 % and 11.4 % of the Company’s loan portfolio, respectively . The adoption of ASU 2020-04 did not have a significant impact on the Company’s financial statements.

Nature of Operations and Summ_3

Nature of Operations and Summary of Significant Accounting and Reporting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table illustrates the computation of basic and diluted earnings per share: Year Ended December 31, 2022 2021 2020 Amount Per Share Amount Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 524,516 $ 519,297 $ 528,904 Basic: Weighted average shares outstanding 91,604 $ 5.73 92,657 $ 5.60 93,058 $ 5.68 Diluted: Add incremental shares for: Effect of dilutive securities - options — — — Total $ 91,604 $ 5.73 $ 92,657 $ 5.60 $ 93,058 $ 5.68

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2022
Business Combinations [Abstract]
Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans	PCD Loans. The recorded investment in PCD loans included in the consolidated balance sheets and the related outstanding balances at December 31, 2022 and 2021 are presented in the table below. The outstanding balance represents the total amount owed as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 (Dollars in thousands) PCD loans: Outstanding balance $ 63,383 $ 83,909 Discount ( 3,361 ) ( 4,838 ) Recorded investment $ 60,022 $ 79,071 Non-PCD Loans. The recorded investment in Non-PCD loans included in the consolidated balance sheets and the related outstanding balances at December 31, 2022 and 2021 are presented in the table below. The outstanding balance represents the total amount owed as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 (Dollars in thousands) Non-PCD loans: Outstanding balance $ 1,319,507 $ 2,094,039 Discount ( 2,233 ) ( 8,143 ) Recorded investment $ 1,317,274 $ 2,085,896
Summary of Changes in Accretable Yields of Acquired Loans	Changes in the accretable yield for acquired PCD loans for the years ended December 31, 2022 and 2021 were as follows: Year Ended December 31, 2022 2021 (Dollars in thousands) Balance at beginning of period $ 4,838 $ 14,216 Accretion charge-offs — ( 1,540 ) Accretion ( 1,477 ) ( 7,838 ) Balance at December 31, $ 3,361 $ 4,838 Changes in the discount accretion for Non-PCD loans for the years ended December 31, 2022 and 2021 were as follows: Year Ended December 31, 2022 2021 (Dollars in thousands) Balance at beginning of period $ 8,143 $ 39,587 Accretion recoveries (charge-offs) 14 ( 4 ) Accretion ( 5,924 ) ( 31,440 ) Balance at December 31, $ 2,233 $ 8,143

Goodwill and Core Deposit Int_2

Goodwill and Core Deposit Intangibles (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Core Deposit Intangibles	Changes in the carrying amount of the Company’s goodwill and core deposit intangibles for fiscal years 2022 and 2021 were as follows: Goodwill Core Deposit Intangibles (Dollars in thousands) Balance as of December 31, 2020 $ 3,231,636 $ 73,235 Less: Amortization — ( 11,551 ) Balance as of December 31, 2021 3,231,636 61,684 Less: Amortization — ( 10,336 ) Balance as of December 31, 2022 $ 3,231,636 $ 51,348
Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles	The estimated aggregate future amortization expense for core deposit intangibles remaining as of December 31, 2022 is as follows (dollars in thousands): 2023 $ 9,360 2024 8,699 2025 8,173 2026 7,684 Thereafter 17,432 Total $ 51,348

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2022
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Investment Securities	The amortized cost and fair value of investment securities were as follows: December 31, 2022 Amortized Cost Gross Gross Fair Value (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 359,251 $ 1,190 $ ( 3,039 ) $ 357,402 Mortgage-backed securities 101,647 93 ( 2,640 ) 99,100 Total $ 460,898 $ 1,283 $ ( 5,679 ) $ 456,502 Held to Maturity States and political subdivisions $ 122,361 $ 868 $ ( 3,255 ) $ 119,974 Corporate debt securities 12,000 — ( 2,520 ) 9,480 Collateralized mortgage obligations 271,727 377 ( 22,922 ) 249,182 Mortgage-backed securities 13,613,415 2,575 ( 1,607,501 ) 12,008,489 Total $ 14,019,503 $ 3,820 $ ( 1,636,198 ) $ 12,387,125 December 31, 2021 Amortized Cost Gross Gross Fair Value (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 483,761 $ 1,942 $ ( 32 ) $ 485,671 Mortgage-backed securities 28,881 550 ( 170 ) 29,261 Total $ 512,642 $ 2,492 $ ( 202 ) $ 514,932 Held to Maturity States and political subdivisions $ 132,620 $ 5,968 $ ( 114 ) $ 138,474 Collateralized mortgage obligations 39,675 483 ( 78 ) 40,080 Mortgage-backed securities 12,131,674 87,967 ( 146,982 ) 12,072,659 Total $ 12,303,969 $ 94,418 $ ( 147,174 ) $ 12,251,213
Securities in Continuous Loss Position	Securities with unrealized losses segregated by length of time such securities have been in a continuous loss position were as follows: December 31, 2022 Less than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 61,559 $ ( 3,012 ) $ 99,179 $ ( 27 ) $ 160,738 $ ( 3,039 ) Mortgage-backed securities 95,212 ( 2,627 ) 291 ( 13 ) 95,503 ( 2,640 ) Total $ 156,771 $ ( 5,639 ) $ 99,470 $ ( 40 ) $ 256,241 $ ( 5,679 ) Held to Maturity States and political subdivisions $ 49,782 $ ( 885 ) $ 16,298 $ ( 2,370 ) $ 66,080 $ ( 3,255 ) Corporate debt securities 9,480 ( 2,520 ) — — 9,480 ( 2,520 ) Collateralized mortgage obligations 214,538 ( 22,557 ) 4,358 ( 365 ) 218,896 ( 22,922 ) Mortgage-backed securities 5,276,315 ( 416,053 ) 6,585,470 ( 1,191,448 ) 11,861,785 ( 1,607,501 ) Total $ 5,550,115 $ ( 442,015 ) $ 6,606,126 $ ( 1,194,183 ) $ 12,156,241 $ ( 1,636,198 ) December 31, 2021 Less than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) Available for Sale Collateralized mortgage obligations $ 164,220 $ ( 31 ) $ 25,916 $ ( 1 ) $ 190,136 $ ( 32 ) Mortgage-backed securities 2 — 19,674 ( 170 ) 19,676 ( 170 ) Total $ 164,222 $ ( 31 ) $ 45,590 $ ( 171 ) $ 209,812 $ ( 202 ) Held to Maturity States and political subdivisions $ 6,216 $ ( 60 ) $ 1,454 $ ( 54 ) $ 7,670 $ ( 114 ) Collateralized mortgage obligations 8,166 ( 78 ) — — 8,166 ( 78 ) Mortgage-backed securities 7,553,096 ( 141,652 ) 288,359 ( 5,330 ) 7,841,455 ( 146,982 ) Total $ 7,567,478 $ ( 141,790 ) $ 289,813 $ ( 5,384 ) $ 7,857,291 $ ( 147,174 )
Investment Securities by Contractual Maturity	The table below summarizes the amortized cost and fair value of investment securities at December 31, 2022, by contractual maturity. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations at any time with or without call or prepayment penalties. Held to Maturity Available for Sale Amortized Cost Fair Value Amortized Cost Fair Value (Dollars in thousands) Due in one year or less $ 14,338 $ 14,349 $ — $ — Due after one year through five years 57,687 58,215 — — Due after five years through ten years 47,138 43,330 — — Due after ten years 15,198 13,560 — — Subtotal 134,361 129,454 — — Mortgage-backed securities and collateralized mortgage obligations 13,885,142 12,257,671 460,898 456,502 Total $ 14,019,503 $ 12,387,125 $ 460,898 $ 456,502

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Types of Loans in Loan Portfolio	The loan portfolio consists of various types of loans made principally to borrowers located within the states of Texas and Oklahoma and is categorized by major type as follows: December 31, 2022 2021 (Dollars in thousands) Residential mortgage loans held for sale $ 554 $ 7,274 Commercial and industrial 2,594,742 2,711,820 Real estate: Construction, land development and other land loans 2,805,438 2,299,715 1-4 family residential (including home equity) 6,740,670 5,661,434 Commercial real estate (including multi-family residential) 4,986,211 5,251,368 Farmland 518,095 442,343 Agriculture 169,938 177,995 Consumer and other 283,559 288,496 Total loans held for investment, excluding Warehouse Purchase Program 18,098,653 16,833,171 Warehouse Purchase Program 740,620 1,775,699 Total loans, including Warehouse Purchase Program $ 18,839,827 $ 18,616,144
Schedule of Contractual Maturities of Loans Classified by Major Type	Loan Maturities. The contractual maturity ranges of the Company’s loan portfolio, excluding loans held for sale of $ 554 thousand and Warehouse Purchase Program Loans of $ 740.6 million, by type of loan and the amount of such loans with predetermined interest rates and variable rates in each maturity range as of December 31, 2022 are summarized in the following table. Contractual maturities are based on contractual amounts outstanding and do not include loan purchase discounts of $ 5.6 million. One Year or Less After One Year After Five Years After Fifteen Years Total (Dollars in thousands) Commercial and industrial $ 912,464 $ 1,159,238 $ 391,577 $ 134,896 $ 2,598,175 Real estate: Construction, land development and other land loans 525,939 605,405 482,483 1,191,626 2,805,453 1-4 family residential (includes home equity) 36,077 140,770 2,063,624 4,493,583 6,734,054 Commercial (includes multi-family residential) 242,863 654,570 2,359,080 1,737,614 4,994,127 Agriculture (includes farmland) 133,103 64,496 240,382 250,568 688,549 Consumer and other 76,253 72,547 73,052 62,037 283,889 Total $ 1,926,699 $ 2,697,026 $ 5,610,198 $ 7,870,324 $ 18,104,247 Loans with a predetermined interest rate $ 494,309 $ 1,029,637 $ 3,597,784 $ 2,947,066 $ 8,068,796 Loans with a variable interest rate 1,432,390 1,667,389 2,012,414 4,923,258 10,035,451 Total $ 1,926,699 $ 2,697,026 $ 5,610,198 $ 7,870,324 $ 18,104,247
Related Party Loans	An analysis of activity with respect to these related-party loans is as follows: As of and for the year ended December 31, 2022 2021 (Dollars in thousands) Beginning balance on January 1 $ 6,524 $ 1,732 New loans 54 5,761 Repayments ( 6,031 ) ( 969 ) Ending balance $ 547 $ 6,524
Aging Analysis of Past Due Loans	An aging analysis of past due loans, segregated by category of loan, is presented below: December 31, 2022 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total Loans (Dollars in thousands) Construction, land development and other land loans $ 9,976 $ 4,442 $ 14,418 $ 318 $ 2,790,702 $ 2,805,438 Warehouse Purchase Program loans — — — — 740,620 740,620 Agriculture and agriculture real estate (includes farmland) 1,751 — 1,751 421 685,861 688,033 1-4 family (includes home equity) (1) 25,880 7 25,887 14,762 6,700,575 6,741,224 Commercial real estate (includes multi-family residential) 3,176 — 3,176 1,649 4,981,386 4,986,211 Commercial and industrial 10,575 1,468 12,043 2,453 2,580,246 2,594,742 Consumer and other 378 — 378 11 283,170 283,559 Total $ 51,736 $ 5,917 $ 57,653 $ 19,614 $ 18,762,560 $ 18,839,827 December 31, 2021 Loans Past Due and Still Accruing 30-89 Days 90 or More Total Past Nonaccrual Current Total Loans (Dollars in thousands) Construction, land development and other land loans $ 4,572 $ — $ 4,572 $ 1,841 $ 2,293,302 $ 2,299,715 Warehouse Purchase Program loans — — — — 1,775,699 1,775,699 Agriculture and agriculture real estate (includes farmland) 995 — 995 546 618,797 620,338 1-4 family (includes home equity) (1) 12,963 19 12,982 11,348 5,644,378 5,668,708 Commercial real estate (includes multi-family residential) 5,773 118 5,891 7,159 5,238,318 5,251,368 Commercial and industrial 4,041 750 4,791 5,360 2,701,669 2,711,820 Consumer and other 450 — 450 15 288,031 288,496 Total $ 28,794 $ 887 $ 29,681 $ 26,269 $ 18,560,194 $ 18,616,144 (1) Includes $ 554 thousand and $ 7.3 million of residential mortgage loans held for sale at December 31, 2022 and December 31, 2021 , respectively.
Non-performing Assets	The following table presents information regarding nonperforming assets at the dates indicated: December 31, 2022 2021 2020 (Dollars in thousands) Nonaccrual loans (1) $ 19,614 (2) $ 26,269 (2) $ 47,185 (2) Accruing loans 90 or more days past due 5,917 887 1,699 Total nonperforming loans 25,531 27,156 48,884 Repossessed assets — 310 93 Other real estate 1,963 622 10,593 Total nonperforming assets $ 27,494 $ 28,088 $ 59,570 Nonperforming assets to total loans and other real estate 0.15 % 0.15 % 0.29 % Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate 0.15 % 0.17 % 0.34 % Nonaccrual loans to total loans 0.10 % 0.14 % 0.23 % Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans 0.11 % 0.16 % 0.27 % (1) Includes troubled debt restructurings of $ 4.6 million, $ 4.2 million and $ 11.3 million for the years ended December 31, 2022, 2021and 2020, respectively. (2) There were no nonperforming or troubled debt restructurings of Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.
Risk Grade by Category of Loan and Year of Origination	The following table presents loans by risk grade and category of loan and year of origination at December 31, 2022. Term Loans Amortized Cost Basis by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Construction, Land Development and Other Land Loans Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 357 — — — — 96 — — 453 Grade 3 1,273,281 773,814 224,007 142,311 36,528 35,289 146,374 17,425 2,649,029 Grade 4 59,822 39,739 10,320 2,342 4,388 6,714 2,916 — 126,241 Grade 5 — — — 17,926 — 661 1,193 — 19,780 Grade 6 3,114 5,947 — — 93 294 — — 9,448 Grade 7 — — — — — 28 290 — 318 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — 94 — 75 — — 169 Total $ 1,336,574 $ 819,500 $ 234,327 $ 162,673 $ 41,009 $ 43,157 $ 150,773 $ 17,425 $ 2,805,438 Agriculture and Agriculture Real Estate (includes Farmland) Grade 1 $ 2,661 $ 412 $ 75 $ — $ 60 $ — $ 8,931 $ 19 $ 12,158 Grade 2 — 110 — — — 1,140 25 — 1,275 Grade 3 224,762 101,179 65,195 39,642 25,284 75,494 79,593 1,018 612,167 Grade 4 14,945 22,737 3,427 524 1,195 8,093 7,052 — 57,973 Grade 5 543 299 — 535 33 865 — — 2,275 Grade 6 250 816 — — — 513 — — 1,579 Grade 7 — — 213 22 — 165 21 — 421 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — 185 — — 185 Total $ 243,161 $ 125,553 $ 68,910 $ 40,723 $ 26,572 $ 86,455 $ 95,622 $ 1,037 $ 688,033 1-4 Family (includes Home Equity) (1) Grade 1 $ — $ — $ 112 $ — $ — $ — $ — $ — $ 112 Grade 2 — 165 248 75 97 3,480 — — 4,065 Grade 3 1,766,032 2,059,111 1,145,209 464,160 226,749 817,864 111,651 675 6,591,451 Grade 4 22,060 19,699 6,444 8,650 13,705 45,066 4,924 103 120,651 Grade 5 70 — 598 4,417 1,218 1,651 — — 7,954 Grade 6 165 233 15 145 567 1,104 — — 2,229 Grade 7 680 2,076 2,237 1,421 2,722 5,626 — — 14,762 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 1,789,007 $ 2,081,284 $ 1,154,863 $ 478,868 $ 245,058 $ 874,791 $ 116,575 $ 778 $ 6,741,224 Term Loans Amortized Cost Basis by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Commercial Real Estate (includes Multi-Family Residential) Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 7,268 — 354 138 — 1,032 — — 8,792 Grade 3 937,839 659,746 475,697 318,409 316,986 858,432 88,419 — 3,655,528 Grade 4 128,508 207,769 158,787 73,168 159,218 321,051 18,969 248 1,067,718 Grade 5 1,113 - 5,879 34,823 23,376 31,609 1,096 — 97,896 Grade 6 15 7,129 25,526 — 1,137 76,221 — — 110,028 Grade 7 — — — — 889 395 365 — 1,649 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 18,597 20,760 5,019 193 31 — — 44,600 Total $ 1,074,743 $ 893,241 $ 687,003 $ 431,557 $ 501,799 $ 1,288,771 $ 108,849 $ 248 $ 4,986,211 Commercial and Industrial Grade 1 $ 26,949 $ 9,275 $ 1,991 $ 1,196 $ 260 $ 118 $ 24,738 $ 42 $ 64,569 Grade 2 8,814 2,382 263 — 298 1,791 1,966 — 15,514 Grade 3 450,071 221,557 98,478 82,418 42,685 131,097 1,112,918 364 2,139,588 Grade 4 44,502 15,186 14,022 29,121 39,720 18,701 111,152 207 272,611 Grade 5 9,800 11,318 561 116 305 — 18,450 — 40,550 Grade 6 475 619 5,067 1,629 4 — 36,595 — 44,389 Grade 7 1,243 659 17 238 4 101 191 — 2,453 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 172 97 228 — 168 14,403 — 15,068 Total $ 541,854 $ 261,168 $ 120,496 $ 114,946 $ 83,276 $ 151,976 $ 1,320,413 $ 613 $ 2,594,742 Consumer and Other Grade 1 $ 20,279 $ 5,582 $ 2,757 $ 934 $ 818 $ 61 $ 1,927 $ — $ 32,358 Grade 2 14,103 - - - - 3,238 1,007 — 18,348 Grade 3 76,265 28,106 29,850 12,484 8,381 6,221 57,042 12 218,361 Grade 4 10 4,321 2,711 29 314 113 6,964 — 14,462 Grade 5 — — — — — — 19 — 19 Grade 6 — — — — — — — — — Grade 7 — — 6 5 — — — — 11 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 110,657 $ 38,009 $ 35,324 $ 13,452 $ 9,513 $ 9,633 $ 66,959 $ 12 $ 283,559 Term Loans Amortized Cost Basis by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Warehouse Purchase Program Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — — — — — — — — Grade 3 740,620 — — — — — — — 740,620 Grade 4 — — — — — — — — — Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 740,620 $ — $ — $ — $ — $ — $ — $ — $ 740,620 Total Grade 1 $ 49,889 $ 15,269 $ 4,935 $ 2,130 $ 1,138 $ 179 $ 35,596 $ 61 $ 109,197 Grade 2 30,542 2,657 865 213 395 10,777 2,998 — 48,447 Grade 3 5,468,870 3,843,513 2,038,436 1,059,424 656,613 1,924,397 1,595,997 19,494 16,606,744 Grade 4 269,847 309,451 195,711 113,834 218,540 399,738 151,977 558 1,659,656 Grade 5 11,526 11,617 7,038 57,817 24,932 34,786 20,758 — 168,474 Grade 6 4,019 14,744 30,608 1,774 1,801 78,132 36,595 — 167,673 Grade 7 1,923 2,735 2,473 1,686 3,615 6,315 867 — 19,614 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 18,769 20,857 5,341 193 459 14,403 — 60,022 Total $ 5,836,616 $ 4,218,755 $ 2,300,923 $ 1,242,219 $ 907,227 $ 2,454,783 $ 1,859,191 $ 20,113 $ 18,839,827 (1) Includes $ 554 thousand of residential mortgage loans held for sale at December 31, 2022 .
Allowance for Credit Losses on Loans by Category of Loan	The following tables detail the activity in the allowance for credit losses on loans by category of loan for the years ended December 31, 2022, 2021 and 2020, respectively. Construction, Land Development and Other Land Loans Agriculture and Agriculture Real Estate (includes Farmland) 1-4 Family (includes Home Equity) Commercial Real Estate (includes Multi-Family Residential) Commercial and Industrial Consumer and Other Total (Dollars in thousands) Allowance for credit losses on loans: Balance January 1, 2022 $ 58,897 $ 7,759 $ 56,710 $ 75,005 $ 80,412 $ 7,597 $ 286,380 Provision for credit losses 20,372 ( 67 ) 3,883 ( 7,873 ) ( 18,934 ) 2,619 — Charge-offs ( 435 ) ( 274 ) ( 168 ) ( 870 ) ( 1,273 ) ( 5,503 ) ( 8,523 ) Recoveries 19 281 370 10 2,114 925 3,719 Net charge-offs ( 416 ) 7 202 ( 860 ) 841 ( 4,578 ) ( 4,804 ) Balance December 31, 2022 $ 78,853 $ 7,699 $ 60,795 $ 66,272 $ 62,319 $ 5,638 $ 281,576 Allowance for credit losses on loans: Balance January 1, 2021 $ 44,892 $ 7,824 $ 44,555 $ 87,857 $ 116,795 $ 14,145 $ 316,068 Provision for credit losses 13,729 ( 206 ) 12,190 5,424 ( 27,330 ) ( 3,807 ) — Charge-offs — ( 51 ) ( 129 ) ( 18,408 ) ( 10,735 ) ( 4,053 ) ( 33,376 ) Recoveries 276 192 94 132 1,682 1,312 3,688 Net charge-offs 276 141 ( 35 ) ( 18,276 ) ( 9,053 ) ( 2,741 ) ( 29,688 ) Balance December 31, 2021 $ 58,897 $ 7,759 $ 56,710 $ 75,005 $ 80,412 $ 7,597 $ 286,380 Allowance for credit losses on loans: Beginning balance, prior to adoption of ASU 2016-13 $ 14,654 $ 2,971 $ 15,277 $ 12,332 $ 40,445 $ 1,790 $ 87,469 Impact of adoption ASU 2016-13 14,075 2,797 8,267 48,990 139,624 26,785 240,538 Provision for credit losses 16,513 2,031 23,301 27,756 ( 38,667 ) ( 10,934 ) 20,000 Charge-offs ( 654 ) ( 62 ) ( 2,674 ) ( 1,302 ) ( 26,011 ) ( 4,867 ) ( 35,570 ) Recoveries 304 87 384 81 1,404 1,371 3,631 Net charge-offs ( 350 ) 25 ( 2,290 ) ( 1,221 ) ( 24,607 ) ( 3,496 ) ( 31,939 ) Balance December 31, 2020 $ 44,892 $ 7,824 $ 44,555 $ 87,857 $ 116,795 $ 14,145 $ 316,068
Summary of Recorded Investment of Loans Modified as Troubled Debt Restructurings	The following table presents information regarding the recorded investment of loans that were modified as troubled debt restructurings during the years ended December 31, 2022 and 2021. Years Ended December 31, 2022 2021 Number of Loans Recorded Investment at Date of Restructure Recorded Investment at Year-End Number of Loans Recorded Investment at Date of Restructure Recorded Investment at Year-End (Dollars in thousands) Troubled Debt Restructurings Construction, land development and other land loans — $ — $ — — $ — $ — Agriculture and agriculture real estate (includes farmland) — — — — — — 1-4 Family (includes home equity) — — — — — — Commercial real estate (commercial mortgage and multi-family) 1 3,144 3,126 — — — Commercial and industrial 1 750 698 — — — Consumer and other — — — — — — Total 2 $ 3,894 $ 3,824 — $ — $ —

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Assets Measured on Recurring Basis	The following tables present fair values for assets measured at fair value on a recurring basis: December 31, 2022 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Collateralized mortgage obligations $ — $ 357,402 $ — $ 357,402 Mortgage-backed securities — 99,100 — 99,100 Total available for sale securities — 456,502 — 456,502 Derivative financial instruments: Interest rate lock commitments $ — $ 94 $ — $ 94 Forward mortgage-backed securities trades — 31 — 31 Loan customer counterparty — — — — Financial institution counterparty — 5,522 — 5,522 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ 6 $ — $ 6 Forward mortgage-backed securities trades — — — — Loan customer counterparty — 5,522 — 5,522 Financial institution counterparty — — — — December 31, 2021 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Collateralized mortgage obligations $ — $ 485,671 $ — $ 485,671 Mortgage-backed securities — 29,261 — 29,261 Total available for sale securities — 514,932 — 514,932 Derivative financial instruments: Interest rate lock commitments $ — $ 237 $ — $ 237 Forward mortgage-backed securities trades — 18 — 18 Loan customer counterparty — 4,124 — 4,124 Financial institution counterparty — — — — Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ — $ — $ — Forward mortgage-backed securities trades — 18 — 18 Loan customer counterparty — — — — Financial institution counterparty — 4,124 — 4,124
Summary of Carrying Values and Estimated Fair Values of Financial Instruments on Recurring Basis	The following tables summarize the carrying values and estimated fair values of certain financial instruments not recorded at fair value on a recurring basis: As of December 31, 2022 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 423,832 $ 423,832 $ — $ — $ 423,832 Federal funds sold 301 301 — — 301 Held to maturity securities 14,019,503 — 12,387,125 — 12,387,125 Loans held for sale 554 — 554 — 554 Loans held for investment, net of allowance 17,817,077 — — 17,550,309 17,550,309 Loans held for investment - Warehouse Purchase Program 740,620 — 740,620 — 740,620 Other real estate owned 1,963 — 1,963 — 1,963 Liabilities Deposits: Noninterest-bearing $ 10,915,448 $ — $ 10,915,448 $ — $ 10,915,448 Interest-bearing 17,618,083 — 17,563,711 — 17,563,711 Other borrowings 1,850,000 — 1,850,000 — 1,850,000 Securities sold under repurchase agreements 428,134 — 428,061 — 428,061 As of December 31, 2021 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 2,547,739 $ 2,547,739 $ — $ — $ 2,547,739 Federal funds sold 241 241 — — 241 Held to maturity securities 12,303,969 — 12,251,213 — 12,251,213 Loans held for sale 7,274 — 7,274 — 7,274 Loans held for investment, net of allowance 16,546,791 — — 16,650,432 16,650,432 Loans held for investment - Warehouse Purchase Program 1,775,699 — 1,775,699 — 1,775,699 Other real estate owned 622 — 622 — 622 Liabilities Deposits: Noninterest-bearing $ 10,750,034 $ — $ 10,750,034 $ — $ 10,750,034 Interest-bearing 20,021,728 — 20,023,909 — 20,023,909 Securities sold under repurchase agreements 448,099 — 448,095 — 448,095

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property Plant And Equipment [Abstract]
Schedule of Premises and Equipment	Premises and equipment are summarized as follows: December 31, 2022 2021 (Dollars in thousands) Land $ 132,515 $ 117,328 Buildings 257,334 252,003 Furniture, fixtures and equipment 102,322 98,152 Construction in progress 14,792 5,559 Total 506,963 473,042 Less accumulated depreciation ( 167,510 ) ( 153,243 ) Premises and equipment, net $ 339,453 $ 319,799

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2022
Deposits [Abstract]
Schedule of Certificates and Their Remaining Maturities	These certificates and their remaining maturities at December 31, 2022 were as follows (dollars in thousands): Three months or less $ 199,156 32.4 % Over three through six months 343,443 55.9 Over six through 12 months 53,820 8.8 Over 12 months 18,120 2.9 Total $ 614,539 100.0 %

Other Borrowings and Securiti_2

Other Borrowings and Securities Sold Under Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of Other Borrowings and Securities Sold Under Repurchase Agreements	Borrowings consist of funds from the Federal Home Loan Bank (“FHLB”) and securities sold under repurchase agreements. December 31, 2022 2021 (Dollars in thousands) FHLB advances $ 1,850,000 $ — Securities sold under repurchase agreements 428,134 448,099 Total $ 2,278,134 $ 448,099

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Components of Income Tax Expense	The components of income tax expense are as follows: Year Ended December 31, 2022 2021 2020 (Dollars in thousands) Current $ 135,611 $ 117,528 $ 91,314 Deferred 6,046 22,829 24,816 Total $ 141,657 $ 140,357 $ 116,130
Schedule of Income Tax Reconciliation	The provision for federal income taxes differs from the amount computed by applying the federal income tax statutory rate of 21 % for 2022, 2021 and 2020 to income before income taxes as follows: Year Ended December 31, 2022 2021 2020 (Dollars in thousands) Taxes calculated at statutory rate $ 139,901 $ 138,527 $ 135,457 Increase (decrease) resulting from: Excess FMV on restricted stock vesting 9 84 52 Certain compensation >$ 1 million 948 1,136 615 Nondeductible compensation 945 945 873 Tax-exempt interest ( 1,625 ) ( 1,961 ) ( 2,455 ) Qualified School Construction Bond credit ( 1,288 ) ( 1,369 ) ( 1,453 ) Nontaxable death benefits ( 215 ) ( 192 ) ( 286 ) BOLI income ( 1,075 ) ( 1,098 ) ( 1,208 ) State tax, net 2,315 2,399 2,230 Other, net 1,742 1,886 2,450 Net operating loss carryback — — ( 20,145 ) Total $ 141,657 $ 140,357 $ 116,130
Schedule of Deferred Tax Assets and Liabilities	Year-end deferred taxes are presented in the table below. Deferred taxes as of December 31, 2022 and 2021 are based on the U.S. statutory federal corporate income tax rate of 21 %. December 31, 2022 2021 (Dollars in thousands) Deferred tax assets: Loan purchase discounts $ 1,175 $ 2,726 Allowance for credit losses 59,131 60,139 Accrued liabilities 3,002 3,216 Restricted stock 4,844 4,404 CECL unfunded loans 6,289 6,289 Deferred compensation 2,138 2,239 Certificates of Deposit 51 116 Unrealized loss on available for sale securities 923 — Securities 115 81 Other 13 13 Total deferred tax assets 77,681 79,223 Deferred tax liabilities: Goodwill and core deposit intangibles ( 37,006 ) ( 36,998 ) Bank premises and equipment ( 9,482 ) ( 9,370 ) Unrealized gain on available for sale securities — ( 481 ) Prepaid expenses ( 1,475 ) ( 1,500 ) Deferred loan fees and costs ( 11,642 ) ( 8,299 ) Investments in partnerships ( 1,520 ) ( 1,377 ) Total deferred tax liabilities ( 61,125 ) ( 58,025 ) Net deferred tax assets $ 16,556 $ 21,198

Stock Incentive Programs (Table

Stock Incentive Programs (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of the Status of Nonvested Shares of Restricted Stock	A summary of the status of nonvested shares of restricted stock as of December 31, 2022, and changes during the year then ended is as follows: Number of Shares Weighted Average Grant Date Fair Value (Shares in thousands) Nonvested share awards outstanding, December 31, 2021 498 $ 70.64 Share awards granted 153 72.72 Unvested share awards forfeited ( 28 ) 70.85 Share awards vested ( 119 ) 71.22 Nonvested share awards outstanding, December 31, 2022 504 $ 71.11

Other Noninterest Income and _2

Other Noninterest Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2022
Text Block [Abstract]
Schedule of Noninterest Income Expense Other	Any components of these totals exceeding 1% of the aggregate of total net interest income and total noninterest income for any of the years presented, as well as amounts the Company elected to present, are stated separately. Years Ended December 31, 2022 2021 2020 (Dollars in thousands) Other noninterest income Banking related service fees $ 7,943 $ 7,132 $ 6,525 Bank Owned Life Insurance (BOLI) 5,119 5,228 5,754 Rental income 2,279 1,399 1,348 Other 15,042 14,528 15,161 Total $ 30,383 $ 28,287 $ 28,788 Other noninterest expense Advertising $ 3,201 $ 3,179 $ 3,486 Losses 2,610 3,066 3,251 Printing and supplies 3,034 2,563 3,075 Professional and legal fees 8,515 9,515 9,034 Property taxes 9,014 9,257 9,343 Travel and development 6,107 5,243 5,317 Other 14,387 12,865 17,171 Total $ 46,868 $ 45,688 $ 50,677

Off-Balance Sheet Arrangement_2

Off-Balance Sheet Arrangements, Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Off Balance Sheet Arrangements Commitments And Contingencies [Abstract]
Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Federal Home Loan Bank Advances	The Company’s future cash payments associated with its contractual obligations pursuant to its FHLB advances as of December 31, 2022 are summarized below. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Federal Home Loan Bank advances $ 1,850,000 $ — $ — $ — $ 1,850,000
Summary of Commitments Associated with Outstanding Standby Letters of Credit and Commitments to Extend Credit	The Company’s commitments associated with outstanding standby letters of credit, unused capacity on Warehouse Purchase Program loans and commitments to extend credit expiring by period as of December 31, 2022 are summarized below. Since commitments associated with letters of credit, unused capacity of Warehouse Purchase Program loans and commitments to extend credit may expire unused, the amounts shown may not necessarily reflect the actual future cash funding requirements. 1 year or less More than 1 year but less than 3 years 3 years or more but less than 5 years 5 years or more Total (Dollars in thousands) Standby letters of credit $ 56,019 $ 5,529 $ 2,469 $ — $ 64,017 Unused capacity on Warehouse Purchase Program loans 1,442,380 — — — 1,442,380 Commitments to extend credit 1,700,290 1,224,419 457,793 1,989,782 5,372,284 Total $ 3,198,689 $ 1,229,948 $ 460,262 $ 1,989,782 $ 6,878,681
Future Undiscounted Cash Payments Associated with its Operating Leases	The Company’s future undiscounted cash payments associated with its operating leases as of December 31, 2022 are summarized below (dollars in thousands). 2023 $ 10,311 2024 9,500 2025 8,931 2026 7,916 2027 5,028 Thereafter 6,869 Total undiscounted lease payments $ 48,555

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Component of Other Comprehensive Income	For the Years Ended December 31, 2022 2021 2020 Before Tax Net of Before Tax Net of Before Tax Net of (Dollars in thousands) Other comprehensive (loss) income: Securities available for sale: Change in unrealized (loss) gain during period $ ( 6,686 ) $ 1,404 $ ( 5,282 ) $ 1,316 $ ( 276 ) $ 1,040 $ 212 $ ( 45 ) $ 167 Total securities available for sale ( 6,686 ) 1,404 ( 5,282 ) 1,316 ( 276 ) 1,040 212 ( 45 ) 167 Total other comprehensive (loss) income $ ( 6,686 ) $ 1,404 $ ( 5,282 ) $ 1,316 $ ( 276 ) $ 1,040 $ 212 $ ( 45 ) $ 167
Activity in Accumulated Other Comprehensive Income, Net of Tax	Activity in accumulated other comprehensive income, net of tax, was as follows: Securities Accumulated (Dollars in thousands) Balance at January 1, 2022 $ 1,809 $ 1,809 Other comprehensive loss ( 5,282 ) ( 5,282 ) Balance at December 31, 2022 $ ( 3,473 ) $ ( 3,473 ) Balance at January 1, 2021 $ 769 $ 769 Other comprehensive income 1,040 1,040 Balance at December 31, 2021 $ 1,809 $ 1,809 Balance at January 1, 2020 $ 602 $ 602 Other comprehensive income 167 167 Balance at December 31, 2020 $ 769 $ 769

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Notional Balances and Fair Value of Derivative Positions	The following table provides the outstanding notional balances and fair values of outstanding derivative positions at December 31, 2022 and 2021. December 31, 2022 December 31, 2021 Outstanding Asset Liability Outstanding Asset Liability (Dollars in thousands) Interest rate lock commitments $ 4,599 $ 94 $ 6 $ 8,411 $ 237 $ — Forward mortgage-backed securities trades 5,250 31 — 22,250 18 18 Commercial loan interest rate swaps and caps: Loan customer counterparty 93,214 — 5,522 198,683 4,124 — Financial institution counterparty 93,214 5,522 — 198,683 — 4,124
Schedule of Weighted Average Received and Paid Interest Rates for Interest Rate Swaps Outstanding	The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at December 31, 2022 and 2021 are presented in the following table. Weighted-Average Interest Rate December 31, 2022 December 31, 2021 Received Paid Received Paid Loan customer counterparty 3.05 % 5.18 % 2.64 % 0.80 %
Schedule of Income (Loss) from Derivatives Not Designated as Hedging Instruments	Income (loss) for the years ended December 31, 2022, 2021 and 2020 was as follows: Year Ended December 31, Derivatives not designated as hedging instruments 2022 2021 2020 Interest rate lock commitments $ 88 $ 237 $ ( 305 ) Forward mortgage-backed securities trades 740 181 ( 2,398 )

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2022
Banking And Thrift Disclosure [Abstract]
Capital Ratios	The following is a summary of the Company’s and the Bank’s capital ratios at December 31, 2022 and 2021: Actual Minimum Required For Capital Adequacy Purposes Minimum Required Plus Capital Conservation Buffer To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) CONSOLIDATED: As of December 31, 2022 CET1 Capital (to Risk Weighted Assets) $ 3,498,958 15.88 % $ 991,669 4.50 % $ 1,542,597 7.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 3,498,958 15.88 1,322,226 6.00 1,873,153 8.50 N/A N/A Total Capital (to Risk Weighted Assets) 3,638,419 16.51 1,762,968 8.00 2,313,895 10.50 N/A N/A Tier 1 Capital (to Average Tangible Assets) 3,498,958 10.16 1,377,930 4.00 1,377,930 4.00 N/A N/A As of December 31, 2021 CET1 Capital (to Risk Weighted Assets) $ 3,249,915 15.10 % $ 968,788 4.50 % $ 1,507,004 7.00 % N/A N/A Tier 1 Capital (to Risk Weighted Assets) 3,249,915 15.10 1,291,718 6.00 1,829,933 8.50 N/A N/A Total Capital (to Risk Weighted Assets) 3,325,703 15.45 1,722,290 8.00 2,260,506 10.50 N/A N/A Tier 1 Capital (to Average Tangible Assets) 3,249,915 9.62 1,351,272 4.00 1,351,272 4.00 N/A N/A BANK ONLY: As of December 31, 2022 CET1 Capital (to Risk Weighted Assets) $ 3,486,720 15.83 % $ 991,380 4.50 % $ 1,542,147 7.00 % $ 1,431,994 6.50 % Tier 1 Capital (to Risk Weighted Assets) 3,486,720 15.83 1,321,840 6.00 1,872,607 8.50 1,762,454 8.00 Total Capital (to Risk Weighted Assets) 3,626,184 16.46 1,762,454 8.00 2,313,221 10.50 2,203,067 10.00 Tier 1 Capital (to Average Tangible Assets) 3,486,720 10.12 1,377,765 4.00 1,377,765 4.00 1,722,207 5.00 As of December 31, 2021 CET1 Capital (to Risk Weighted Assets) $ 3,235,504 15.03 % $ 968,411 4.50 % $ 1,506,418 7.00 % $ 1,398,816 6.50 % Tier 1 Capital (to Risk Weighted Assets) 3,235,504 15.03 1,291,215 6.00 1,829,222 8.50 1,721,620 8.00 Total Capital (to Risk Weighted Assets) 3,311,292 15.39 1,721,620 8.00 2,259,627 10.50 2,152,025 10.00 Tier 1 Capital (to Average Tangible Assets) 3,235,504 9.58 1,350,820 4.00 1,350,820 4.00 1,688,525 5.00

Parent Company Only Financial_2

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2022
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	CONDENSED BALANCE SHEETS December 31, 2022 2021 (Dollars in thousands) ASSETS Cash $ 3,890 $ 3,548 Investment in subsidiary 6,683,154 6,408,843 Goodwill 3,982 3,982 Other assets 8,348 10,863 TOTAL $ 6,699,374 $ 6,427,236 LIABILITIES AND SHAREHOLDERS’ EQUITY LIABILITIES: Accrued interest payable and other liabilities $ — $ — Subordinated notes — — Total liabilities — — SHAREHOLDERS’ EQUITY: Common stock 91,314 92,170 Capital surplus 3,541,924 3,595,024 Retained earnings 3,069,609 2,738,233 Unrealized (loss) gain on available for sale securities, net of tax ( 3,473 ) 1,809 Total shareholders’ equity 6,699,374 6,427,236 TOTAL $ 6,699,374 $ 6,427,236
Condensed Statements of Income	CONDENSED STATEMENTS OF INCOME For the Years Ended December 31, 2022 2021 2020 (Dollars in thousands) OPERATING INCOME: Dividends from subsidiary $ 256,721 $ 229,088 $ 351,213 Other income 8 14 22 Total income 256,729 229,102 351,235 OPERATING EXPENSE: Subordinated notes and trust preferred interest expense — — 5,498 Stock based compensation expense (includes restricted stock) 11,765 12,572 12,607 Other expenses 1,968 1,993 1,495 Total operating expense 13,733 14,565 19,600 INCOME BEFORE INCOME TAX BENEFIT AND EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES 242,996 214,537 331,635 FEDERAL INCOME TAX BENEFIT 1,927 1,886 7,202 INCOME BEFORE EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES 244,923 216,423 338,837 EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES 279,593 302,874 190,067 NET INCOME $ 524,516 $ 519,297 $ 528,904
Condensed Statements of Comprehensive Income	CONDENSED STATEMENTS OF COMPREHENSIVE INCOME For the Years Ended December 31, 2022 2021 2020 (Dollars in thousands) Net income $ 524,516 $ 519,297 $ 528,904 Other comprehensive (loss) income, before tax: Securities available for sale: Change in unrealized (losses) gains during the period ( 6,686 ) 1,316 212 Total other comprehensive (loss) income ( 6,686 ) 1,316 212 Deferred tax benefit (expense) related to other comprehensive (loss) income 1,404 ( 276 ) ( 45 ) Other comprehensive (loss) income, net of tax ( 5,282 ) 1,040 167 Comprehensive income $ 519,234 $ 520,337 $ 529,071
Condensed Statements of Cash Flows	CONDENSED STATEMENTS OF CASH FLOWS For the Years Ended December 31, 2022 2021 2020 (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income $ 524,516 $ 519,297 $ 528,904 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries ( 279,593 ) ( 302,874 ) ( 190,067 ) Stock based compensation expense (includes restricted stock) 11,765 12,572 12,607 Decrease (increase) in other assets 2,515 3,649 ( 1,667 ) Decrease in accrued interest payable and other liabilities — — ( 1,987 ) Net cash provided by operating activities 259,203 232,644 347,790 CASH FLOWS FROM INVESTING ACTIVITIES: Cash paid for acquisitions — — — Net cash used in investing activities — — — CASH FLOWS FROM FINANCING ACTIVITIES: Redemption of junior subordinated debentures — — ( 125,000 ) Repurchase of common stock ( 65,721 ) ( 52,089 ) ( 115,161 ) Payments of cash dividends ( 193,140 ) ( 184,253 ) ( 173,823 ) Net cash used in financing activities ( 258,861 ) ( 236,342 ) ( 413,984 ) NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 342 ( 3,698 ) ( 66,194 ) CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 3,548 7,246 73,440 CASH AND CASH EQUIVALENTS, END OF PERIOD $ 3,890 $ 3,548 $ 7,246

Nature of Operations and Summ_4

Nature of Operations and Summary of Significant Accounting and Reporting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Location Segment shares	Dec. 31, 2021 shares	Dec. 31, 2020 shares
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	272
Number of Reportable Segments | Segment	1
Number of Investment Securities Segments | Segment	2
Minimum Percentage Likelihood of Tax Benefit to be Realized Upon Final Settlement	50%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares	0	0	0
Number of options outstanding | shares	0
Interest rate swaps and loans portfolio description of index rate basis	LIBOR was used as an index rate for the Company’s interest-rate swaps and approximately 1.5% and 11.4% of the Company’s loan portfolio, respectively
Percentage of loan portfolio which used LIBOR as an index rate	1.50%	11.40%
Increase in allowance for credit losses for loans | $	$ (4,800,000)
Minimum [Member]
Summary of Accounting and Financial Policies [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Finite-lived intangible asset, useful life	10 years
Maximum [Member]
Summary of Accounting and Financial Policies [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Finite-lived intangible asset, useful life	15 years
Warehouse Purchase Program [Member]
Summary of Accounting and Financial Policies [Line Items]
Allowance for loan losses | $	$ 0
Houston [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	65
South Texas [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	30
Dallas, Texas [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	62
East Texas [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	22
Central Texas [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	29
West Texas [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	34
Bryan/College Station [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	16
Central Oklahoma [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	6
Tulsa, Oklahoma [Member]
Summary of Accounting and Financial Policies [Line Items]
Number of bank operating locations	8

Nature of Operations and Summ_5

Nature of Operations and Summary of Significant Accounting and Reporting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 524,516	$ 519,297	$ 528,904
Weighted average shares outstanding (in shares)	91,604	92,657	93,058
Weighted average shares outstanding (in dollars per share)	$ 5.73	$ 5.60	$ 5.68
Total (in shares)	91,604	92,657	93,058
Total (in dollars per share)	$ 5.73	$ 5.60	$ 5.68

Acquisitions (Summary) - Additi

Acquisitions (Summary) - Additional Information (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Oct. 11, 2022 USD ($) Office shares	Dec. 31, 2022 USD ($) Location	Dec. 31, 2020 USD ($)	Oct. 07, 2022 $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Number of bank operating locations | Location		272
Total assets		$ 37,689,829			$ 37,833,970
Loans		18,558,251			18,329,764
Total deposits		28,533,531			30,771,762
Shareholders’ equity		6,699,374	$ 6,130,669		6,427,236	$ 5,970,835
Payments to acquire businesses in cash	$ 93,400
Goodwill		3,231,636	3,231,636		$ 3,231,636
Merger-related expenses		$ 272	$ 8,018
West Texas [Member]
Business Acquisition [Line Items]
Number of bank operating locations | Location		34
First Bancshares of Texas Inc [Member]
Business Acquisition [Line Items]
Total assets		$ 2,160,000
Loans		1,640,000
Total deposits		1,800,000
Business acquisition, equity interest issued or issuable, number of shares | shares	3,583,370
Business acquisition, closing share price | $ / shares				$ 69.27
Total consideration	$ 341,600
First Bancshares of Texas Inc [Member] | West North and Central Texas [Member]
Business Acquisition [Line Items]
Number of full-service banking offices | Office	16
Lone Star State Bancshares Inc [Member]
Business Acquisition [Line Items]
Total assets		1,430,000
Loans		999,600
Total deposits		$ 1,280,000
Business acquisition, equity interest issued or issuable, number of shares | shares	2,376,182
Business acquisition, closing share price | $ / shares				$ 69.27
Payments to acquire businesses in cash	$ 64,100
Total consideration	$ 228,700
Lone Star State Bancshares Inc [Member] | West Texas [Member]
Business Acquisition [Line Items]
Number of banking offices | Office	5
Minimum [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		10 years
Maximum [Member]
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		15 years

Acquisitions - Recorded Investm

Acquisitions - Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	$ 63,383	$ 83,909
Discount	(3,361)	(4,838)
Recorded investment	60,022	79,071
Non-PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	1,319,507	2,094,039
Discount	(2,233)	(8,143)
Recorded investment	$ 1,317,274	$ 2,085,896

Acquisitions - Summary of Chang

Acquisitions - Summary of Changes in Accretable Yields of Acquired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
PCD Loans [Member]
Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]
Balance at beginning of period	$ 4,838	$ 14,216
Accretion charge-offs		(1,540)
Accretion	(1,477)	(7,838)
Balance at December 31,	3,361	4,838
Non-PCD Loans [Member]
Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]
Balance at beginning of period	8,143	39,587
Accretion recoveries (charge-offs)	14	(4)
Accretion	(5,924)	(31,440)
Balance at December 31,	$ 2,233	$ 8,143

Acquisitions (Acquired Loans) -

Acquisitions (Acquired Loans) - Additional Information (Details) $ in Millions	Dec. 31, 2022 USD ($)
Non PCD and PCD Loans [Member]
Business Acquisition [Line Items]
Outstanding discount on loans	$ 5.6

Goodwill and Core Deposit Int_3

Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Beginning balance	$ 3,231,636	$ 3,231,636
Goodwill, Ending balance	3,231,636	3,231,636	$ 3,231,636
Core Deposit Intangibles, Beginning balance	61,684	73,235
Core Deposit Intangibles, Amortization	(10,336)	(11,551)	(13,169)
Core Deposit Intangibles, Ending balance	$ 51,348	$ 61,684	$ 73,235

Goodwill and Core Deposit Int_4

Goodwill and Core Deposit Intangibles - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)
Schedule Of Intangible Assets And Goodwill [Line Items]
Impairment recorded on goodwill and core deposit intangibles	$ 0
Minimum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, useful life	10 years
Maximum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, useful life	15 years

Goodwill and Core Deposit Int_5

Goodwill and Core Deposit Intangibles - Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
2023	$ 9,360
2024	8,699
2025	8,173
2026	7,684
Thereafter	17,432
Total	$ 51,348	$ 61,684	$ 73,235

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Amortized Cost	$ 460,898	$ 512,642
Available for Sale, Gross Unrealized Gains	1,283	2,492
Available for Sale, Gross Unrealized Losses	(5,679)	(202)
Available for Sale	456,502	514,932
Held to Maturity, Amortized Cost	14,019,503	12,303,969
Held to Maturity, Gross Unrealized Gains	3,820	94,418
Held to Maturity, Gross Unrealized Losses	(1,636,198)	(147,174)
Held to Maturity	12,387,125	12,251,213
Collateralized Mortgage Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Amortized Cost	359,251	483,761
Available for Sale, Gross Unrealized Gains	1,190	1,942
Available for Sale, Gross Unrealized Losses	(3,039)	(32)
Available for Sale	357,402	485,671
Held to Maturity, Amortized Cost	271,727	39,675
Held to Maturity, Gross Unrealized Gains	377	483
Held to Maturity, Gross Unrealized Losses	(22,922)	(78)
Held to Maturity	249,182	40,080
Mortgage-backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Amortized Cost	101,647	28,881
Available for Sale, Gross Unrealized Gains	93	550
Available for Sale, Gross Unrealized Losses	(2,640)	(170)
Available for Sale	99,100	29,261
Held to Maturity, Amortized Cost	13,613,415	12,131,674
Held to Maturity, Gross Unrealized Gains	2,575	87,967
Held to Maturity, Gross Unrealized Losses	(1,607,501)	(146,982)
Held to Maturity	12,008,489	12,072,659
States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Amortized Cost	122,361	132,620
Held to Maturity, Gross Unrealized Gains	868	5,968
Held to Maturity, Gross Unrealized Losses	(3,255)	(114)
Held to Maturity	119,974	$ 138,474
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Amortized Cost	12,000
Held to Maturity, Gross Unrealized Losses	(2,520)
Held to Maturity	$ 9,480

Securities - Additional Informa

Securities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Segment Security	Dec. 31, 2021 USD ($) Security	Dec. 31, 2020 USD ($)
Schedule Of Held To Maturity Securities [Line Items]
Number of Investment Securities Segments | Segment	2
Credit losses	$ 0
Municipal securities percentage of securities portfolio	0.80%
Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions Greater Than or Equal to One Year | Security	174	30
Gain (loss) on sale of securities	$ 0	$ 0	$ 0
Available for Sale Securities, Amortized Cost Basis	460,898,000	512,642,000
Available for sale securities, at fair value	456,502,000	514,932,000
Collateralized Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Available for Sale Securities, Amortized Cost Basis	7,870,000,000	6,970,000,000
Available for sale securities, at fair value	$ 6,900,000,000	$ 6,990,000,000
Securities Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Other Than U.S. Government and Agencies [Member]
Schedule Of Held To Maturity Securities [Line Items]
Concentration Risk, Percentage	10%	10%

Securities - Securities in Cont

Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	$ 156,771	$ 164,222
Available for Sale, Unrealized Losses, Less than 12 Months	(5,639)	(31)
Available for Sale, Estimated Fair Value, 12 Months or More	99,470	45,590
Available for Sale, Unrealized Losses, 12 Months or More	(40)	(171)
Available for Sale, Estimated Fair Value, Total	256,241	209,812
Available for Sale, Unrealized Losses, Total	(5,679)	(202)
Held to Maturity, Estimated Fair Value, Less than 12 Months	5,550,115	7,567,478
Held to Maturity, Unrealized Losses, Less than 12 Months	(442,015)	(141,790)
Held to Maturity, Estimated Fair Value, 12 Months or More	6,606,126	289,813
Held to Maturity, Unrealized Losses, 12 Months or More	(1,194,183)	(5,384)
Held to Maturity, Estimated Fair Value, Total	12,156,241	7,857,291
Held to Maturity, Unrealized Losses, Total	(1,636,198)	(147,174)
Collateralized Mortgage Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	61,559	164,220
Available for Sale, Unrealized Losses, Less than 12 Months	(3,012)	(31)
Available for Sale, Estimated Fair Value, 12 Months or More	99,179	25,916
Available for Sale, Unrealized Losses, 12 Months or More	(27)	(1)
Available for Sale, Estimated Fair Value, Total	160,738	190,136
Available for Sale, Unrealized Losses, Total	(3,039)	(32)
Held to Maturity, Estimated Fair Value, Less than 12 Months	214,538	8,166
Held to Maturity, Unrealized Losses, Less than 12 Months	(22,557)	(78)
Held to Maturity, Estimated Fair Value, 12 Months or More	4,358
Held to Maturity, Unrealized Losses, 12 Months or More	(365)
Held to Maturity, Estimated Fair Value, Total	218,896	8,166
Held to Maturity, Unrealized Losses, Total	(22,922)	(78)
Mortgage-backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	95,212	2
Available for Sale, Unrealized Losses, Less than 12 Months	(2,627)
Available for Sale, Estimated Fair Value, 12 Months or More	291	19,674
Available for Sale, Unrealized Losses, 12 Months or More	(13)	(170)
Available for Sale, Estimated Fair Value, Total	95,503	19,676
Available for Sale, Unrealized Losses, Total	(2,640)	(170)
Held to Maturity, Estimated Fair Value, Less than 12 Months	5,276,315	7,553,096
Held to Maturity, Unrealized Losses, Less than 12 Months	(416,053)	(141,652)
Held to Maturity, Estimated Fair Value, 12 Months or More	6,585,470	288,359
Held to Maturity, Unrealized Losses, 12 Months or More	(1,191,448)	(5,330)
Held to Maturity, Estimated Fair Value, Total	11,861,785	7,841,455
Held to Maturity, Unrealized Losses, Total	(1,607,501)	(146,982)
States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Estimated Fair Value, Less than 12 Months	49,782	6,216
Held to Maturity, Unrealized Losses, Less than 12 Months	(885)	(60)
Held to Maturity, Estimated Fair Value, 12 Months or More	16,298	1,454
Held to Maturity, Unrealized Losses, 12 Months or More	(2,370)	(54)
Held to Maturity, Estimated Fair Value, Total	66,080	7,670
Held to Maturity, Unrealized Losses, Total	(3,255)	$ (114)
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Estimated Fair Value, Less than 12 Months	9,480
Held to Maturity, Unrealized Losses, Less than 12 Months	(2,520)
Held to Maturity, Estimated Fair Value, Total	9,480
Held to Maturity, Unrealized Losses, Total	$ (2,520)

Securities - Investment Securit

Securities - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]
Held to Maturity, amortized cost, due in one year or less	$ 14,338
Held to Maturity, amortized cost, due after one year through five years	57,687
Held to Maturity, amortized cost, due after five years through ten years	47,138
Held to Maturity, amortized cost, due after ten years	15,198
Held to Maturity, amortized cost, subtotal	134,361
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations	13,885,142
Held to Maturity, Amortized Cost	14,019,503	$ 12,303,969
Held to Maturity, fair value, due in one year or less	14,349
Held to Maturity, fair value, due after one year through five years	58,215
Held to Maturity, fair value, due after five years through ten years	43,330
Held to Maturity, fair value, due after ten years	13,560
Held to Maturity, fair value, subtotal	129,454
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations	12,257,671
Held to Maturity, fair value, total	12,387,125	12,251,213
Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations	460,898
Available for Sale, Amortized Cost	460,898	512,642
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations	456,502
Available for Sale securities, at fair value	$ 456,502	$ 514,932

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Types of Loans in Loan Portfolio (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		$ 554	$ 7,274
Loans held for investment		18,098,653	16,833,171
Total loans, including Warehouse Purchase Program		18,839,827	18,616,144
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		554	7,274
Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		740,620	1,775,699
Total loans, including Warehouse Purchase Program		740,620	1,775,699
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,594,742	2,711,820
Total loans, including Warehouse Purchase Program		2,594,742	2,711,820
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,805,438	2,299,715
Total loans, including Warehouse Purchase Program		2,805,438	2,299,715
Real Estate [Member] | 1-4 Family [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		6,740,670	5,661,434
Total loans, including Warehouse Purchase Program	[1]	6,741,224	5,668,708
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		4,986,211	5,251,368
Total loans, including Warehouse Purchase Program		4,986,211	5,251,368
Real Estate [Member] | Farmland [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		518,095	442,343
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		169,938	177,995
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		283,559	288,496
Total loans, including Warehouse Purchase Program		$ 283,559	$ 288,496
[1] Includes $ 554 thousand and $ 7.3 million of residential mortgage loans held for sale at December 31, 2022 and December 31, 2021 , respectively.

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Contract Asset	Dec. 31, 2021 USD ($) Contract Asset	Dec. 31, 2020 USD ($) Asset	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Loan purchase discounts	$ 5,600,000
Loans held for sale	554,000
Loans	$ 18,558,251,000	$ 18,329,764,000
Percentage of Loans Related to Single Industry on Loans	10%	10%
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans	80.30%	78.50%
Loans and Leases Receivable, Related Parties	$ 547,000	$ 6,524,000	$ 1,732,000
Loans held for investment	$ 18,098,653,000	$ 16,833,171,000
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate	0.15%	0.15%	0.29%
Nonperforming assets, number of credits or other real estate properties | Asset	170
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 1,800,000	$ 6,500,000	$ 3,300,000
Loans and leases receivable, nonaccrual loans	19,600,000	26,300,000	47,200,000
Financing Receivable, Allowance for Credit Losses on Loans	$ 281,600,000	$ 286,400,000
Allowance for Credit Losses as Percentage of Loans	1.49%	1.54%
Decrease in allowance for credit losses for loans	$ 4,800,000
Decrease in allowance for credit losses for loans, percentage	1.70%
Net charge-offs	$ 4,804,000	$ 29,688,000	31,939,000
Partial charge-offs of one commercial real estate loan	8,523,000	33,376,000	35,570,000
Allowance for credit losses on off-balance sheet credit exposures	29,947,000	29,947,000
Commitments expected to fund	2,520,000,000
Nonaccrual loans	$ 19,614,000	$ 26,269,000
Financing receivable, number of loans with default | Contract	0
Loan to be Considered as Payment Default in Period		90 days
Financing receivable, modifications, number of contract | Contract		0
Restructured loans charge-off	$ 0	$ 0
Troubled Debt Restructuring [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses on off-balance sheet credit exposures	29,900,000	29,900,000
Nonaccrual loans	4,600,000	4,200,000
New Troubled Debt Restructuring [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	3,824,000
Financing receivable, modifications, recorded investment	$ 3,894,000
Financing receivable, modifications, number of contract | Contract	2
PCD Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Specific reserves	$ 8,200,000
CARES Act [Member] | Paycheck Protection Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Funded amount	6,200,000
Nonperforming Financial Instruments [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	$ 27,500,000	$ 28,100,000	$ 59,600,000
Nonperforming assets, number of credits or other real estate properties | Asset		157	208
Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Participation interest in mortgage loans acquired percentage	100%
Warehouse Purchase Program [Member] | Troubled Debt Restructuring [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 0	$ 0	$ 0	$ 0
Commercial Real Estate (Includes Multi-Family Residential) [Member] | New Troubled Debt Restructuring [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 3,126,000
Financing receivable, modifications, recorded investment	$ 3,144,000
Financing receivable, modifications, number of contract | Contract	1
Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 740,600,000
Loans held for investment	$ 740,620,000	1,775,699,000
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan collateralized	89%
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	$ 4,986,211,000	5,251,368,000
Net charge-offs	860,000	18,276,000	1,221,000
Partial charge-offs of one commercial real estate loan	870,000	18,408,000	$ 1,302,000
Nonaccrual loans	$ 1,649,000	$ 7,159,000
Real Estate [Member] | FHA and VA Loans [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Debt instrument, term	30 years
Minimum [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan evaluation by loan concurrence officers	$ 1,000,000
Minimum [Member] | Consumer Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Debt instrument, term	12 months
Minimum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Debt instrument, term	5 years
Minimum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Debt instrument, term	15 years
Maximum [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan evaluation by loan concurrence officers	$ 5,000,000
Maximum [Member] | Consumer Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Debt instrument, term	180 months
Maximum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Debt instrument, term	30 years
Maximum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Period of fixed interest	5 years
Debt instrument, term	25 years

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Schedule of Contractual Maturities of Loans Classified by Major Type (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Loans, net	$ 18,104,247
Loans with a predetermined interest rate	8,068,796
Loans with a variable interest rate	10,035,451
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	688,549
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	2,598,175
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	2,805,453
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	6,734,054
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	4,994,127
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	283,889
Financing Receivable, Maturity of One Year or Less [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	1,926,699
Loans with a predetermined interest rate	494,309
Loans with a variable interest rate	1,432,390
Financing Receivable, Maturity of One Year or Less [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	133,103
Financing Receivable, Maturity of One Year or Less [Member] | Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	912,464
Financing Receivable, Maturity of One Year or Less [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	525,939
Financing Receivable, Maturity of One Year or Less [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	36,077
Financing Receivable, Maturity of One Year or Less [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	242,863
Financing Receivable, Maturity of One Year or Less [Member] | Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	76,253
Financing Receivable, Maturity After One Year Through Five Years [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	2,697,026
Loans with a predetermined interest rate	1,029,637
Loans with a variable interest rate	1,667,389
Financing Receivable, Maturity After One Year Through Five Years [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	64,496
Financing Receivable, Maturity After One Year Through Five Years [Member] | Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	1,159,238
Financing Receivable, Maturity After One Year Through Five Years [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	605,405
Financing Receivable, Maturity After One Year Through Five Years [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	140,770
Financing Receivable, Maturity After One Year Through Five Years [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	654,570
Financing Receivable, Maturity After One Year Through Five Years [Member] | Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	72,547
Financing Receivable, Maturity After Five Years Through Fifteen Years [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	5,610,198
Loans with a predetermined interest rate	3,597,784
Loans with a variable interest rate	2,012,414
Financing Receivable, Maturity After Five Years Through Fifteen Years [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	240,382
Financing Receivable, Maturity After Five Years Through Fifteen Years [Member] | Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	391,577
Financing Receivable, Maturity After Five Years Through Fifteen Years [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	482,483
Financing Receivable, Maturity After Five Years Through Fifteen Years [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	2,063,624
Financing Receivable, Maturity After Five Years Through Fifteen Years [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	2,359,080
Financing Receivable, Maturity After Five Years Through Fifteen Years [Member] | Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	73,052
Financing Receivable, Maturity After Fifteen Years [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	7,870,324
Loans with a predetermined interest rate	2,947,066
Loans with a variable interest rate	4,923,258
Financing Receivable, Maturity After Fifteen Years [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	250,568
Financing Receivable, Maturity After Fifteen Years [Member] | Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	134,896
Financing Receivable, Maturity After Fifteen Years [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	1,191,626
Financing Receivable, Maturity After Fifteen Years [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	4,493,583
Financing Receivable, Maturity After Fifteen Years [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	1,737,614
Financing Receivable, Maturity After Fifteen Years [Member] | Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, net	$ 62,037

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Related Party Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Beginning balance on January 1	$ 6,524	$ 1,732
New loans	54	5,761
Repayments	(6,031)	(969)
Ending balance	$ 547	$ 6,524

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 18,762,560	$ 18,560,194
Nonaccrual loans		19,614	26,269
Total loans		18,839,827	18,616,144
Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		51,736	28,794
Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		5,917	887
Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		57,653	29,681
Warehouse Purchase Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		740,620	1,775,699
Total loans		740,620	1,775,699
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		685,861	618,797
Nonaccrual loans		421	546
Total loans		688,033	620,338
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,751	995
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,751	995
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,790,702	2,293,302
Nonaccrual loans		318	1,841
Total loans		2,805,438	2,299,715
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		9,976	4,572
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		4,442
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		14,418	4,572
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	6,700,575	5,644,378
Nonaccrual loans	[1]	14,762	11,348
Total loans	[1]	6,741,224	5,668,708
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	25,880	12,963
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	7	19
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	25,887	12,982
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		4,981,386	5,238,318
Nonaccrual loans		1,649	7,159
Total loans		4,986,211	5,251,368
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		3,176	5,773
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing			118
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		3,176	5,891
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,580,246	2,701,669
Nonaccrual loans		2,453	5,360
Total loans		2,594,742	2,711,820
Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		10,575	4,041
Commercial and Industrial [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,468	750
Commercial and Industrial [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		12,043	4,791
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		283,170	288,031
Nonaccrual loans		11	15
Total loans		283,559	288,496
Consumer and Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		378	450
Consumer and Other [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 378	$ 450
[1] Includes $ 554 thousand and $ 7.3 million of residential mortgage loans held for sale at December 31, 2022 and December 31, 2021 , respectively.

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 554	$ 7,274
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 554	$ 7,274

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Nonperforming Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 18,098,653	$ 16,833,171
Other real estate owned		$ 1,963	$ 622
Nonperforming assets to total loans and other real estate		0.15%	0.15%	0.29%
Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate		0.15%	0.17%	0.34%
Nonaccrual loans to total loans		0.10%	0.14%	0.23%
Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans		0.11%	0.16%	0.27%
Nonperforming Financial Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 25,531	$ 27,156	$ 48,884
Repossessed assets			310	93
Other real estate owned		1,963	622	10,593
Total nonperforming assets		27,494	28,088	59,570
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	[1],[2]	19,614	26,269	47,185
Nonperforming Financial Loans [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 5,917	$ 887	$ 1,699
[1] Includes troubled debt restructurings of $ 4.6 million, $ 4.2 million and $ 11.3 million for the years ended December 31, 2022, 2021and 2020, respectively. There were no nonperforming or troubled debt restructurings of Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Nonperforming Assets (Parenthetical) (Details) - USD ($)		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 18,098,653,000	$ 16,833,171,000
Nonperforming Financial Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		25,531,000	27,156,000	$ 48,884,000
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	[1],[2]	19,614,000	26,269,000	47,185,000
Troubled Debt Restructuring [Member] | Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment			0	0	$ 0	$ 0
Troubled Debt Restructuring [Member] | Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		4,600,000	$ 4,200,000	$ 11,300,000
Troubled Debt Restructuring [Member] | Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member] | Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 0
[1] Includes troubled debt restructurings of $ 4.6 million, $ 4.2 million and $ 11.3 million for the years ended December 31, 2022, 2021and 2020, respectively. There were no nonperforming or troubled debt restructurings of Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Risk Grade by Category of Loan and Year of Origination (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Financing Receivable Impaired [Line Items]
2022		$ 5,836,616
2021		4,218,755
2020		2,300,923
2019		1,242,219
2018		907,227
Prior		2,454,783
Revolving Loans		1,859,191
Revolving Loans Converted to Term Loans		20,113
Total loans		18,839,827	$ 18,616,144
PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2021		18,769
2020		20,857
2019		5,341
2018		193
Prior		459
Revolving Loans		14,403
Total loans		60,022
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2022		243,161
2021		125,553
2020		68,910
2019		40,723
2018		26,572
Prior		86,455
Revolving Loans		95,622
Revolving Loans Converted to Term Loans		1,037
Total loans		688,033	620,338
Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2021		18,597
2020		20,760
2019		5,019
2018		193
Prior		31
Total loans		44,600
Warehouse Purchase Program [Member]
Financing Receivable Impaired [Line Items]
2022		740,620
Total loans		740,620	1,775,699
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2022		1,336,574
2021		819,500
2020		234,327
2019		162,673
2018		41,009
Prior		43,157
Revolving Loans		150,773
Revolving Loans Converted to Term Loans		17,425
Total loans		2,805,438	2,299,715
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2019		94
Prior		75
Total loans		169
Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		1,789,007
2021		2,081,284
2020		1,154,863
2019		478,868
2018		245,058
Prior		874,791
Revolving Loans		116,575
Revolving Loans Converted to Term Loans		778
Total loans	[1]	6,741,224	5,668,708
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
Prior		185
Total loans		185
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		1,074,743
2021		893,241
2020		687,003
2019		431,557
2018		501,799
Prior		1,288,771
Revolving Loans		108,849
Revolving Loans Converted to Term Loans		248
Total loans		4,986,211	5,251,368
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		541,854
2021		261,168
2020		120,496
2019		114,946
2018		83,276
Prior		151,976
Revolving Loans		1,320,413
Revolving Loans Converted to Term Loans		613
Total loans		2,594,742	2,711,820
Commercial and Industrial [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2021		172
2020		97
2019		228
Prior		168
Revolving Loans		14,403
Total loans		15,068
Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2022		110,657
2021		38,009
2020		35,324
2019		13,452
2018		9,513
Prior		9,633
Revolving Loans		66,959
Revolving Loans Converted to Term Loans		12
Total loans		283,559	$ 288,496
Grade 1 [Member]
Financing Receivable Impaired [Line Items]
2022		49,889
2021		15,269
2020		4,935
2019		2,130
2018		1,138
Prior		179
Revolving Loans		35,596
Revolving Loans Converted to Term Loans		61
Total loans		109,197
Grade 1 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2022		2,661
2021		412
2020		75
2018		60
Revolving Loans		8,931
Revolving Loans Converted to Term Loans		19
Total loans		12,158
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2020		112
Total loans		112
Grade 1 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		26,949
2021		9,275
2020		1,991
2019		1,196
2018		260
Prior		118
Revolving Loans		24,738
Revolving Loans Converted to Term Loans		42
Total loans		64,569
Grade 1 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2022		20,279
2021		5,582
2020		2,757
2019		934
2018		818
Prior		61
Revolving Loans		1,927
Total loans		32,358
Grade 2 [Member]
Financing Receivable Impaired [Line Items]
2022		30,542
2021		2,657
2020		865
2019		213
2018		395
Prior		10,777
Revolving Loans		2,998
Total loans		48,447
Grade 2 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2021		110
Prior		1,140
Revolving Loans		25
Total loans		1,275
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2022		357
Prior		96
Total loans		453
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2021		165
2020		248
2019		75
2018		97
Prior		3,480
Total loans		4,065
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		7,268
2020		354
2019		138
Prior		1,032
Total loans		8,792
Grade 2 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		8,814
2021		2,382
2020		263
2018		298
Prior		1,791
Revolving Loans		1,966
Total loans		15,514
Grade 2 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2022		14,103
Prior		3,238
Revolving Loans		1,007
Total loans		18,348
Grade 3 [Member]
Financing Receivable Impaired [Line Items]
2022		5,468,870
2021		3,843,513
2020		2,038,436
2019		1,059,424
2018		656,613
Prior		1,924,397
Revolving Loans		1,595,997
Revolving Loans Converted to Term Loans		19,494
Total loans		16,606,744
Grade 3 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2022		224,762
2021		101,179
2020		65,195
2019		39,642
2018		25,284
Prior		75,494
Revolving Loans		79,593
Revolving Loans Converted to Term Loans		1,018
Total loans		612,167
Grade 3 [Member] | Warehouse Purchase Program [Member]
Financing Receivable Impaired [Line Items]
2022		740,620
Total loans		740,620
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2022		1,273,281
2021		773,814
2020		224,007
2019		142,311
2018		36,528
Prior		35,289
Revolving Loans		146,374
Revolving Loans Converted to Term Loans		17,425
Total loans		2,649,029
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		1,766,032
2021		2,059,111
2020		1,145,209
2019		464,160
2018		226,749
Prior		817,864
Revolving Loans		111,651
Revolving Loans Converted to Term Loans		675
Total loans		6,591,451
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		937,839
2021		659,746
2020		475,697
2019		318,409
2018		316,986
Prior		858,432
Revolving Loans		88,419
Total loans		3,655,528
Grade 3 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		450,071
2021		221,557
2020		98,478
2019		82,418
2018		42,685
Prior		131,097
Revolving Loans		1,112,918
Revolving Loans Converted to Term Loans		364
Total loans		2,139,588
Grade 3 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2022		76,265
2021		28,106
2020		29,850
2019		12,484
2018		8,381
Prior		6,221
Revolving Loans		57,042
Revolving Loans Converted to Term Loans		12
Total loans		218,361
Grade 4 [Member]
Financing Receivable Impaired [Line Items]
2022		269,847
2021		309,451
2020		195,711
2019		113,834
2018		218,540
Prior		399,738
Revolving Loans		151,977
Revolving Loans Converted to Term Loans		558
Total loans		1,659,656
Grade 4 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2022		14,945
2021		22,737
2020		3,427
2019		524
2018		1,195
Prior		8,093
Revolving Loans		7,052
Total loans		57,973
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2022		59,822
2021		39,739
2020		10,320
2019		2,342
2018		4,388
Prior		6,714
Revolving Loans		2,916
Total loans		126,241
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		22,060
2021		19,699
2020		6,444
2019		8,650
2018		13,705
Prior		45,066
Revolving Loans		4,924
Revolving Loans Converted to Term Loans		103
Total loans		120,651
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		128,508
2021		207,769
2020		158,787
2019		73,168
2018		159,218
Prior		321,051
Revolving Loans		18,969
Revolving Loans Converted to Term Loans		248
Total loans		1,067,718
Grade 4 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		44,502
2021		15,186
2020		14,022
2019		29,121
2018		39,720
Prior		18,701
Revolving Loans		111,152
Revolving Loans Converted to Term Loans		207
Total loans		272,611
Grade 4 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2022		10
2021		4,321
2020		2,711
2019		29
2018		314
Prior		113
Revolving Loans		6,964
Total loans		14,462
Grade 5 [Member]
Financing Receivable Impaired [Line Items]
2022		11,526
2021		11,617
2020		7,038
2019		57,817
2018		24,932
Prior		34,786
Revolving Loans		20,758
Total loans		168,474
Grade 5 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2022		543
2021		299
2019		535
2018		33
Prior		865
Total loans		2,275
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2019		17,926
Prior		661
Revolving Loans		1,193
Total loans		19,780
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		70
2020		598
2019		4,417
2018		1,218
Prior		1,651
Total loans		7,954
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		1,113
2020		5,879
2019		34,823
2018		23,376
Prior		31,609
Revolving Loans		1,096
Total loans		97,896
Grade 5 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		9,800
2021		11,318
2020		561
2019		116
2018		305
Revolving Loans		18,450
Total loans		40,550
Grade 5 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
Revolving Loans		19
Total loans		19
Grade 6 [Member]
Financing Receivable Impaired [Line Items]
2022		4,019
2021		14,744
2020		30,608
2019		1,774
2018		1,801
Prior		78,132
Revolving Loans		36,595
Total loans		167,673
Grade 6 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2022		250
2021		816
Prior		513
Total loans		1,579
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2022		3,114
2021		5,947
2018		93
Prior		294
Total loans		9,448
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		165
2021		233
2020		15
2019		145
2018		567
Prior		1,104
Total loans		2,229
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		15
2021		7,129
2020		25,526
2018		1,137
Prior		76,221
Total loans		110,028
Grade 6 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		475
2021		619
2020		5,067
2019		1,629
2018		4
Revolving Loans		36,595
Total loans		44,389
Grade 7 [Member]
Financing Receivable Impaired [Line Items]
2022		1,923
2021		2,735
2020		2,473
2019		1,686
2018		3,615
Prior		6,315
Revolving Loans		867
Total loans		19,614
Grade 7 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2020		213
2019		22
Prior		165
Revolving Loans		21
Total loans		421
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
Revolving Loans		290
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		680
2021		2,076
2020		2,237
2019		1,421
2018		2,722
Prior		5,626
Total loans		14,762
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2018		889
Prior		395
Revolving Loans		365
Total loans		1,649
Grade 7 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		1,243
2021		659
2020		17
2019		238
2018		4
Prior		101
Revolving Loans		191
Total loans		2,453
Grade 7 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2020		6
2019		5
Total loans		11
Grade 8 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
Prior		28
Total loans		$ 318
[1] Includes $ 554 thousand and $ 7.3 million of residential mortgage loans held for sale at December 31, 2022 and December 31, 2021 , respectively.

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Risk Grade by Category of Loan and Year of Origination (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable Impaired [Line Items]
Loans held for sale	$ 554	$ 7,274
Residential Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Loans held for sale	$ 554	$ 7,274

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses - Allowance for Credit Losses on Loans by Category of Loan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	$ 286,380	$ 316,068	$ 87,469
Provision for credit losses			20,000
Charge-offs	(8,523)	(33,376)	(35,570)
Recoveries	3,719	3,688	3,631
Net charge-offs	(4,804)	(29,688)	(31,939)
Allowance for credit losses on loans, ending balance	281,576	286,380	316,068
Accounting Standards Update 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adoption ASU 2016-13			240,538
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	7,759	7,824	2,971
Provision for credit losses	(67)	(206)	2,031
Charge-offs	(274)	(51)	(62)
Recoveries	281	192	87
Net charge-offs	7	141	25
Allowance for credit losses on loans, ending balance	7,699	7,759	7,824
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adoption ASU 2016-13			2,797
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	58,897	44,892	14,654
Provision for credit losses	20,372	13,729	16,513
Charge-offs	(435)		(654)
Recoveries	19	276	304
Net charge-offs	(416)	276	(350)
Allowance for credit losses on loans, ending balance	78,853	58,897	44,892
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adoption ASU 2016-13			14,075
Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	56,710	44,555	15,277
Provision for credit losses	3,883	12,190	23,301
Charge-offs	(168)	(129)	(2,674)
Recoveries	370	94	384
Net charge-offs	202	(35)	(2,290)
Allowance for credit losses on loans, ending balance	60,795	56,710	44,555
Real Estate [Member] | 1-4 Family [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adoption ASU 2016-13			8,267
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	75,005	87,857	12,332
Provision for credit losses	(7,873)	5,424	27,756
Charge-offs	(870)	(18,408)	(1,302)
Recoveries	10	132	81
Net charge-offs	(860)	(18,276)	(1,221)
Allowance for credit losses on loans, ending balance	66,272	75,005	87,857
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adoption ASU 2016-13			48,990
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	80,412	116,795	40,445
Provision for credit losses	(18,934)	(27,330)	(38,667)
Charge-offs	(1,273)	(10,735)	(26,011)
Recoveries	2,114	1,682	1,404
Net charge-offs	841	(9,053)	(24,607)
Allowance for credit losses on loans, ending balance	62,319	80,412	116,795
Commercial and Industrial [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adoption ASU 2016-13			139,624
Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans, beginning balance	7,597	14,145	1,790
Provision for credit losses	2,619	(3,807)	(10,934)
Charge-offs	(5,503)	(4,053)	(4,867)
Recoveries	925	1,312	1,371
Net charge-offs	(4,578)	(2,741)	(3,496)
Allowance for credit losses on loans, ending balance	$ 5,638	$ 7,597	14,145
Consumer and Other [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adoption ASU 2016-13			$ 26,785

Loans and Allowance for Cred_14

Loans and Allowance for Credit Losses - Summary of Recorded Investment of Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Contract	Dec. 31, 2021 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | Contract		0
Recorded Investment at Year-End	$ 19,614	$ 26,269
Commercial and Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment at Year-End	$ 2,453	$ 5,360
New Troubled Debt Restructuring [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | Contract	2
Recorded Investment at Date of Restructure	$ 3,894
Recorded Investment at Year-End	$ 3,824
New Troubled Debt Restructuring [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | Contract	1
Recorded Investment at Date of Restructure	$ 3,144
Recorded Investment at Year-End	$ 3,126
New Troubled Debt Restructuring [Member] | Commercial and Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | Contract	1
Recorded Investment at Date of Restructure	$ 750
Recorded Investment at Year-End	$ 698

Fair Value - Fair Value Assets

Fair Value - Fair Value Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for sale securities:
Available for sale securities, at fair value	$ 456,502	$ 514,932
Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities, at fair value	456,502	514,932
Fair Value, Measurements, Recurring [Member] | Loan Customer Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value		4,124
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	5,522
Fair Value, Measurements, Recurring [Member] | Financial Institution Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	5,522
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value		4,124
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments
Derivative financial instruments:
Derivative financial instruments, assets at fair value	94	237
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	6
Fair Value, Measurements, Recurring [Member] | Forward Mortgage Backed Securities Trades
Derivative financial instruments:
Derivative financial instruments, assets at fair value	31	18
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value		18
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	456,502	514,932
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Loan Customer Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value		4,124
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	5,522
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Institution Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	5,522
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value		4,124
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Lock Commitments
Derivative financial instruments:
Derivative financial instruments, assets at fair value	94	237
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	6
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Forward Mortgage Backed Securities Trades
Derivative financial instruments:
Derivative financial instruments, assets at fair value	31	18
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value		18
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]
Available for sale securities:
Available for sale securities, at fair value	357,402	485,671
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	357,402	485,671
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	99,100	29,261
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	$ 99,100	$ 29,261

Fair Value - Additional Informa

Fair Value - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Fair Value Disclosures [Abstract]
Other real estate, additions	$ 2.4
Real estate owned outstanding	2
Additions to impaired loans	15.2
Impaired loans outstanding	$ 11.6

Fair Value - Summary of Carryin

Fair Value - Summary of Carrying Values and Estimated Fair Values of Financial Instruments on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 423,832	$ 2,547,739
Federal funds sold	301	241
Held to maturity securities	12,387,125	12,251,213
Loans held for sale	554	7,274
Loans held for investment	18,098,653	16,833,171
Other real estate owned	1,963	622
Liabilities
Noninterest-bearing	10,915,448	10,750,034
Interest-bearing	17,618,083	20,021,728
Other borrowings	1,850,000
Securities sold under repurchase agreements	428,134	448,099
Carrying Amount [Member]
Assets
Cash and due from banks	423,832	2,547,739
Federal funds sold	301	241
Held to maturity securities	14,019,503	12,303,969
Loans held for sale	554	7,274
Loans held for investment, net of allowance	17,817,077	16,546,791
Other real estate owned	1,963	622
Liabilities
Noninterest-bearing	10,915,448	10,750,034
Interest-bearing	17,618,083	20,021,728
Other borrowings	1,850,000
Securities sold under repurchase agreements	428,134	448,099
Carrying Amount [Member] | Warehouse Purchase Program [Member]
Assets
Loans held for investment	740,620	1,775,699
Estimated Fair Value [Member]
Assets
Cash and due from banks	423,832	2,547,739
Federal funds sold	301	241
Held to maturity securities	12,387,125	12,251,213
Loans held for sale	554	7,274
Loans held for investment, net of allowance	17,550,309	16,650,432
Other real estate owned	1,963	622
Liabilities
Noninterest-bearing	10,915,448	10,750,034
Interest-bearing	17,563,711	20,023,909
Other borrowings	1,850,000
Securities sold under repurchase agreements	428,061	448,095
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Cash and due from banks	423,832	2,547,739
Federal funds sold	301	241
Estimated Fair Value [Member] | Level 2 [Member]
Assets
Held to maturity securities	12,387,125	12,251,213
Loans held for sale	554	7,274
Other real estate owned	1,963	622
Liabilities
Noninterest-bearing	10,915,448	10,750,034
Interest-bearing	17,563,711	20,023,909
Other borrowings	1,850,000
Securities sold under repurchase agreements	428,061	448,095
Estimated Fair Value [Member] | Level 3 [Member]
Assets
Loans held for investment, net of allowance	17,550,309	16,650,432
Estimated Fair Value [Member] | Warehouse Purchase Program [Member]
Assets
Loans held for investment	740,620	1,775,699
Estimated Fair Value [Member] | Warehouse Purchase Program [Member] | Level 2 [Member]
Assets
Loans held for investment	$ 740,620	$ 1,775,699

Premises and Equipment - Schedu

Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 506,963	$ 473,042
Less accumulated depreciation	(167,510)	(153,243)
Premises and equipment, net	339,453	319,799
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	132,515	117,328
Building [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	257,334	252,003
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	102,322	98,152
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 14,792	$ 5,559

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Depreciation expense	$ 18	$ 18.1	$ 18.2

Deposits - Schedule of Certific

Deposits - Schedule of Certificates and Their Remaining Maturities (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Deposits [Abstract]
Three months or less	$ 199,156
Over three through six months	343,443
Over six through 12 months	53,820
Over 12 months	18,120
Total	$ 614,539
Three months or less, interest rate	32.40%
Over three through six months, interest rate	55.90%
Over six through 12 months, interest rate	8.80%
Over 12 months, interest rate	2.90%
Total, interest rate	100%

Deposits - Additional Informati

Deposits - Additional Information (Details)	Dec. 31, 2022 USD ($)
Deposits [Abstract]
Brokered deposits for regulatory purposes	$ 0

Other Borrowings and Securiti_3

Other Borrowings and Securities Sold Under Repurchase Agreements - Schedule of Other Borrowings and Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
FHLB advances	$ 1,850,000
Securities sold under repurchase agreement	428,134	$ 448,099
Total	$ 2,278,134	$ 448,099

Other Borrowings and Securiti_4

Other Borrowings and Securities Sold Under Repurchase Agreements (FHLB advances and long-term notes payable) - Additional Information (Details)	Dec. 31, 2022 USD ($)
Federal Funds Purchased And Securities Sold Under Agreements To Repurchase [Abstract]
Funds available on other borrowings and securities	$ 13,750,000,000
Federal Home Loan Bank advances	1,850,000,000
Long-term Federal Home Loan Bank advances, noncurrent	$ 0
Federal Home weighted average interest rate	4.01%

Other Borrowings and Securiti_5

Other Borrowings and Securities Sold Under Repurchase Agreements (Securities sold under repurchase agreements with Company customers) - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under repurchase agreement	$ 428,134	$ 448,099
Percentage paid by company on securities sold under agreements to repurchase	4.50%
Decrease securities sold under repurchase agreement	$ (20,000)
Weighted Average [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under repurchase agreement, interest rate	0.58%	0.17%
Minimum [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreement counterparty, weighted average maturity of agreements	12 months
Maximum [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreement counterparty, weighted average maturity of agreements	24 months
Repurchase Agreement with 6 To 24 Maturity Months [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under repurchase agreement	$ 4,200

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Current	$ 135,611	$ 117,528	$ 91,314
Deferred	6,046	22,829	24,816
Total	$ 141,657	$ 140,357	$ 116,130

Income Taxes - Additional infor

Income Taxes - Additional information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21%	21%	21%	35%
Unrecognized tax benefits, income tax penalties and interest accrued	$ 0	$ 0
Income taxes receivable, net operating loss, CARES Act.			$ 20,145,000
Decrease in deferred tax asset			$ 30,200,000

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Taxes calculated at statutory rate	$ 139,901	$ 138,527	$ 135,457
Increase (decrease) resulting from:
Excess FMV on restricted stock vesting	9	84	52
Certain compensation >$1 million	948	1,136	615
Nondeductible compensation	945	945	873
Tax-exempt interest	(1,625)	(1,961)	(2,455)
Qualified School Construction Bond credit	(1,288)	(1,369)	(1,453)
Nontaxable death benefits	(215)	(192)	(286)
BOLI income	(1,075)	(1,098)	(1,208)
State tax, net	2,315	2,399	2,230
Other, net	1,742	1,886	2,450
Net operating loss carryback			(20,145)
Total	$ 141,657	$ 140,357	$ 116,130

Income Taxes - Schedule of In_2

Income Taxes - Schedule of Income Tax Reconciliation (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)
Income Tax Disclosure [Abstract]
Minimum restricted stock compensation for income tax reconciliation as per tax cuts and jobs act.	$ 1,000,000

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Loan purchase discounts	$ 1,175	$ 2,726
Allowance for credit losses	59,131	60,139
Accrued liabilities	3,002	3,216
Restricted stock	4,844	4,404
CECL unfunded loans	6,289	6,289
Deferred compensation	2,138	2,239
Certificates of Deposit	51	116
Unrealized loss on available for sale securities	923
Securities	115	81
Other	13	13
Total deferred tax assets	77,681	79,223
Deferred tax liabilities:
Goodwill and core deposit intangibles	(37,006)	(36,998)
Bank premises and equipment	(9,482)	(9,370)
Unrealized gain on available for sale securities		(481)
Prepaid expenses	(1,475)	(1,500)
Deferred loan fees and costs	(11,642)	(8,299)
Investments in partnerships	(1,520)	(1,377)
Total deferred tax liabilities	(61,125)	(58,025)
Net deferred tax assets	$ 16,556	$ 21,198

Stock Incentive Programs - Addi

Stock Incentive Programs - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Plan shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Mar. 03, 2020 shares	Feb. 22, 2012 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock-based employee compensation plans | Plan	1
Stock-based compensation expense | $	$ 11.8	$ 12.6	$ 12.6
Income tax benefit recorded for stock-based compensation expense | $	$ 1.5	1.4	2
Share issued	831,875
Total unrecognized compensation expense related to stock-based compensation arrangements | $	$ 17.5
Weighted-average period of cost expected to be recognized	1 year 5 months 4 days
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense | $	$ 11.8	$ 12.6	$ 12.6
Number of unvested restricted stock remained outstanding	504,000	498,000
Total fair value of options vested | $	$ 8.5
Restricted Stock [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	1 year
Restricted Stock [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Unvested Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unvested restricted stock remained outstanding	0
2020 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares authorized for issuance				2,500,000
Share issued	40,593
Number of restricted shares granted	503,732
2012 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares authorized for issuance					1,250,000

Stock Incentive Programs - Summ

Stock Incentive Programs - Summary of the Status of Nonvested Shares of Restricted Stock (Details) - Restricted Stock [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Stock Incentive Programs Details Restricted Stock Activity [Line Items]
Number of Shares, Nonvested share awards outstanding, beginning balance | shares	498
Number of Shares, Share awards granted | shares	153
Number of Shares, Unvested share awards forfeited | shares	(28)
Number of Shares, Share awards vested | shares	(119)
Number of Shares, Nonvested share awards outstanding, ending balance | shares	504
Weighted Average Grant Date Fair Value, Nonvested shares awards outstanding, beginning balance | $ / shares	$ 70.64
Weighted Average Grant Date Fair Value, Share awards granted | $ / shares	72.72
Weighted Average Grant Date Fair Value, Unvested share awards forfeited | $ / shares	70.85
Weighted Average Grant Date Fair Value, Share awards vested | $ / shares	71.22
Weighted Average Grant Date Fair Value, Nonvested shares awards outstanding, ending balance | $ / shares	$ 71.11

Other Noninterest Income and _3

Other Noninterest Income and Expense - Other Noninterest Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other noninterest income
Banking related service fees	$ 7,943	$ 7,132	$ 6,525
Bank Owned Life Insurance (BOLI)	5,119	5,228	5,754
Rental income	2,279	1,399	1,348
Other	15,042	14,528	15,161
Total	30,383	28,287	28,788
Other noninterest expense
Advertising	3,201	3,179	3,486
Losses	2,610	3,066	3,251
Printing and supplies	3,034	2,563	3,075
Professional and legal fees	8,515	9,515	9,034
Property taxes	9,014	9,257	9,343
Travel and development	6,107	5,243	5,317
Other	14,387	12,865	17,171
Total	$ 46,868	$ 45,688	$ 50,677

Profit Sharing Plan - Additiona

Profit Sharing Plan - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Employer matching contribution, percent of match	50%
Employer matching contribution, percent of employees' gross pay	15%
Matching contribution amounts	$ 6.4	$ 7.2	$ 7.4

Off-balance Sheet Arrangement_3

Off-balance Sheet Arrangements, Commitments and Contingencies - Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Federal Home Loan Bank Advances (Details) - Guarantee Obligations [Member] $ in Thousands	Dec. 31, 2022 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	$ 3,198,689
More than 1 year but less than 3 years	1,229,948
3 years or more but less than 5 years	460,262
5 years or more	1,989,782
Total	6,878,681
Federal Home Loan Bank Advances [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	1,850,000
Total	$ 1,850,000

Off-balance Sheet Arrangement_4

Off-balance Sheet Arrangements, Commitments and Contingencies - Summary of Commitments Associated with Outstanding Standby Letters of Credit and Commitments to Extend Credit (Details) - Guarantee Obligations [Member] $ in Thousands	Dec. 31, 2022 USD ($)
Offbalance Sheet Arrangements Commitments And Contingencies Details Contractual Obligations And Other Commitments [Line Items]
1 year or less	$ 3,198,689
More than 1 year but less than 3 years	1,229,948
3 years or more but less than 5 years	460,262
5 years or more	1,989,782
Total	6,878,681
Unused capacity on Warehouse Purchase Program loans [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details Contractual Obligations And Other Commitments [Line Items]
1 year or less	1,442,380
Total	1,442,380
Commitments to Extend Credit [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details Contractual Obligations And Other Commitments [Line Items]
1 year or less	1,700,290
More than 1 year but less than 3 years	1,224,419
3 years or more but less than 5 years	457,793
5 years or more	1,989,782
Total	5,372,284
Standby Letters of Credit [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details Contractual Obligations And Other Commitments [Line Items]
1 year or less	56,019
More than 1 year but less than 3 years	5,529
3 years or more but less than 5 years	2,469
5 years or more	0
Total	$ 64,017

Off-balance Sheet Arrangement_5

Off-balance Sheet Arrangements, Commitments and Contingencies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) SubleaseArrangement	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Offbalance Sheet Arrangements Commitments And Contingencies Details [Line Items]
Allowance for credit losses on off-balance sheet credit exposures	$ 29,947	$ 29,947
Number of sublease arrangement | SubleaseArrangement	1
Sublease income	$ 3,200	3,100	$ 660
Operating lease right of use asset	$ 41,800
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Operating lease, weighted average remaining lease term	5 years 6 months
Operating lease, weighted average discount rate, percent	2.26%
Operating lease, payments	$ 10,900	12,200
Right-of-Use asset obtained in exchange for operating lease liability	1,900
Operating lease rent expense	$ 10,900	$ 11,600	$ 13,700
Minimum [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details [Line Items]
Lessee operating lease remaining lease term	1 year
Maximum [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details [Line Items]
Lessee operating lease remaining lease term	16 years
Commitments to Extend Credit [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details [Line Items]
Amount of commitment to extend credit and standby letters of credit	$ 707,800
Commitments to Extend Credit [Member] | Minimum [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details [Line Items]
Percentage of commitments to extend credit and standby letters of credit fixed rate	0%
Commitments to Extend Credit [Member] | Maximum [Member]
Offbalance Sheet Arrangements Commitments And Contingencies Details [Line Items]
Percentage of commitments to extend credit and standby letters of credit fixed rate	21%

Off-balance Sheet Arrangement_6

Off-balance Sheet Arrangements, Commitments and Contingencies - Future Undiscounted Cash Payments Associated with its Operating Leases (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Leases [Abstract]
2023	$ 10,311
2024	9,500
2025	8,931
2026	7,916
2027	5,028
Thereafter	6,869
Total undiscounted lease payments	$ 48,555

Other Comprehensive Income - Co

Other Comprehensive Income - Component of Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity [Abstract]
Change in unrealized (loss) gain during period, before tax amount	$ (6,686)	$ 1,316	$ 212
Change in unrealized (loss) gain during period, tax expense	1,404	(276)	(45)
Change in unrealized (loss) gain during period, net of tax amount	(5,282)	1,040	167
Total securities available for sale, before tax amount	(6,686)	1,316	212
Total securities available for sale, tax expense	1,404	(276)	(45)
Total securities available for sale, net of tax amount	(5,282)	1,040	167
Total other comprehensive (loss) income , before tax amount	(6,686)	1,316	212
Deferred tax benefit (expense) related to other comprehensive (loss) income	1,404	(276)	(45)
Other comprehensive (loss) income, net of tax	(5,282)	1,040	167
Total other comprehensive income (loss), tax expense	$ 1,404	$ (276)	$ (45)

Other Comprehensive Income - Ac

Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Beginning balance, accumulated other comprehensive income	$ 1,809	$ 769	$ 602
Other comprehensive income (loss)	(5,282)	1,040	167
Ending balance, accumulated other comprehensive income	(3,473)	1,809	769
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance, accumulated other comprehensive income	1,809	769	602
Other comprehensive income (loss)	(5,282)	1,040	167
Ending balance, accumulated other comprehensive income	$ (3,473)	$ 1,809	$ 769

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Notional Balances and Fair Value of Derivative Positions (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Interest Rate Lock Commitments
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	$ 4,599	$ 8,411
Derivative financial instruments, assets at fair value	94	237
Derivative financial instruments, liabilities at fair value	6
Forward Mortgage Backed Securities Trades
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	5,250	22,250
Derivative financial instruments, assets at fair value	31	18
Derivative financial instruments, liabilities at fair value		18
Commercial Loan Interest Rate Swaps and Caps [Member] | Loan Customer Counterparty [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	93,214	198,683
Derivative financial instruments, assets at fair value		4,124
Derivative financial instruments, liabilities at fair value	5,522
Commercial Loan Interest Rate Swaps and Caps [Member] | Financial Institution Counterparty [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	93,214	198,683
Derivative financial instruments, assets at fair value	$ 5,522
Derivative financial instruments, liabilities at fair value		$ 4,124

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Weighted Average Received and Paid Interest Rates for Interest Rate Swaps Outstanding (Details) - Commercial Loan Interest Rate Swaps and Caps [Member] - Loan Customer Counterparty [Member]	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Weighted-Average Interest Rate Received	3.05	2.64
Weighted-Average Interest Rate Paid	5.18	0.80

Derivative Financial Instrume_5

Derivative Financial Instruments - Additional Information (Details) - Interest Rate Swap [Member] - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Credit exposure	$ 5,500,000	$ 4,100,000
Cash collateral pledged	0	$ 4,300,000
Financial Institution Counterparty [Member]
Derivative [Line Items]
Credit exposure	$ 562,000

Derivative Financial Instrume_6

Derivative Financial Instruments - Schedule of Income (Loss) from Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest Rate Lock Commitments
Derivative Instruments Gain Loss [Line Items]
Derivatives not designated as hedging instruments	$ 88	$ 237	$ (305)
Forward Mortgage Backed Securities Trades
Derivative Instruments Gain Loss [Line Items]
Derivatives not designated as hedging instruments	$ 740	$ 181	$ (2,398)

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Banking And Thrift Disclosure [Abstract]
Change in allowance for credit losses percentage, during each quarter		25%
Percentage of cumulative amount of transition adjustments recognized in 2022	75%
Percentage of cumulative amount of transition adjustments recognized in 2023	50%
Percentage of cumulative amount of transition adjustments recognized in 2024	25%
CET1 to risk-weighted assets	7%
Tier 1 capital to risk-weighted assets	8.50%
Total capital to risk-weighted assets	10.50%
Tier 1 capital to average quarterly assets	4%
Dividends declared to be paid	$ 193,140	$ 184,253	$ 173,823
Cash dividends paid to parent company	$ 256,700	$ 229,100	$ 351,200

Regulatory Matters - Capital Ra

Regulatory Matters - Capital Ratios (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	7%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	8.50%
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	10.50%
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	4%
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 Capital (to Risk Weighted Assets), Actual Amount	$ 3,498,958	$ 3,249,915
Tier I Capital (to Risk Weighted Assets), Actual Amount	3,498,958	3,249,915
Total Capital (to Risk Weighted Assets), Actual Amount	3,638,419	3,325,703
Tier I Capital (to Average Tangible Assets), Actual Amount	$ 3,498,958	$ 3,249,915
CET1 Capital (to Risk Weighted Assets), Actual Ratio	0.1588	0.1510
Tier I Capital (to Risk Weighted Assets), Actual Ratio	0.1588	0.1510
Total Capital (to Risk Weighted Assets), Actual Ratio	0.1651	0.1545
Tier I Capital (to Average Tangible Assets), Actual Ratio	0.1016	0.0962
CET1 Capital (to Risk Weighted Assets) , Minimum Required Amount For Capital Adequacy Purposes	$ 991,669	$ 968,788
Tier I Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes	1,322,226	1,291,718
Total Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes	1,762,968	1,722,290
Tier I Capital (to Average Tangible Assets), Minimum Required Amount For Capital Adequacy Purposes	$ 1,377,930	$ 1,351,272
CET1 Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes	4.50%	4.50%
Tier I Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes	0.0600	0.0600
Total Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes	0.0800	0.0800
Tier I Capital (to Average Tangible Assets), Minimum Required Ratio For Capital Adequacy Purposes	0.0400	0.0400
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	$ 1,542,597	$ 1,507,004
Tier I Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	1,873,153	1,829,933
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	2,313,895	2,260,506
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	$ 1,377,930	$ 1,351,272
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	7%	7%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	8.50%	8.50%
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	10.50%	10.50%
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	4%	4%
Prosperity Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 Capital (to Risk Weighted Assets), Actual Amount	$ 3,486,720	$ 3,235,504
Tier I Capital (to Risk Weighted Assets), Actual Amount	3,486,720	3,235,504
Total Capital (to Risk Weighted Assets), Actual Amount	3,626,184	3,311,292
Tier I Capital (to Average Tangible Assets), Actual Amount	$ 3,486,720	$ 3,235,504
CET1 Capital (to Risk Weighted Assets), Actual Ratio	0.1583	0.1503
Tier I Capital (to Risk Weighted Assets), Actual Ratio	0.1583	0.1503
Total Capital (to Risk Weighted Assets), Actual Ratio	0.1646	0.1539
Tier I Capital (to Average Tangible Assets), Actual Ratio	0.1012	0.0958
CET1 Capital (to Risk Weighted Assets) , Minimum Required Amount For Capital Adequacy Purposes	$ 991,380	$ 968,411
Tier I Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes	1,321,840	1,291,215
Total Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes	1,762,454	1,721,620
Tier I Capital (to Average Tangible Assets), Minimum Required Amount For Capital Adequacy Purposes	$ 1,377,765	$ 1,350,820
CET1 Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes	4.50%	4.50%
Tier I Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes	0.0600	0.0600
Total Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes	0.0800	0.0800
Tier I Capital (to Average Tangible Assets), Minimum Required Ratio For Capital Adequacy Purposes	0.0400	0.0400
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	$ 1,542,147	$ 1,506,418
Tier I Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	1,872,607	1,829,222
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	2,313,221	2,259,627
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount	$ 1,377,765	$ 1,350,820
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	7%	7%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	8.50%	8.50%
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	10.50%	10.50%
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio	4%	4%
CET1 Capital (to Risk Weighted Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	$ 1,431,994	$ 1,398,816
Tier I Capital (to Risk Weighted Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	1,762,454	1,721,620
Total Capital (to Risk Weighted Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	2,203,067	2,152,025
Tier I Capital (to Average Tangible Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	$ 1,722,207	$ 1,688,525
CET1 Capital (to Risk Weighted Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	6.50%	6.50%
Tier I Capital (to Risk Weighted Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	0.0800	0.0800
Total Capital (to Risk Weighted Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	0.1000	0.1000
Tier I Capital (to Average Tangible Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions	0.0500	0.0500

Parent Company Only Financial_3

Parent Company Only Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Goodwill	$ 3,231,636	$ 3,231,636	$ 3,231,636
Other assets	101,138	121,504
TOTAL ASSETS	37,689,829	37,833,970
LIABILITIES:
Total liabilities	30,990,455	31,406,734
SHAREHOLDERS’ EQUITY:
Common stock	91,314	92,171
Capital surplus	3,541,924	3,595,023
Retained earnings	3,069,609	2,738,233
Unrealized (loss) gain on available for sale securities, net of tax	(3,473)	1,809	769	$ 602
Total shareholders’ equity	6,699,374	6,427,236	$ 6,130,669	$ 5,970,835
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	37,689,829	37,833,970
Parent Company [Member]
ASSETS
Cash	3,890	3,548
Investment in subsidiary	6,683,154	6,408,843
Goodwill	3,982	3,982
Other assets	8,348	10,863
TOTAL ASSETS	6,699,374	6,427,236
SHAREHOLDERS’ EQUITY:
Common stock	91,314	92,170
Capital surplus	3,541,924	3,595,024
Retained earnings	3,069,609	2,738,233
Unrealized (loss) gain on available for sale securities, net of tax	(3,473)	1,809
Total shareholders’ equity	6,699,374	6,427,236
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 6,699,374	$ 6,427,236

Parent Company Only Financial_4

Parent Company Only Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING INCOME:
Total interest income	$ 1,094,835	$ 1,046,923	$ 1,143,910
OPERATING EXPENSE:
Subordinated notes and trust preferred interest expense			5,498
Stock based compensation expense (includes restricted stock)	11,800	12,600	12,600
FEDERAL INCOME TAX BENEFIT	(141,657)	(140,357)	(116,130)
NET INCOME	524,516	519,297	528,904
Parent Company [Member]
OPERATING INCOME:
Dividends from subsidiary	256,721	229,088	351,213
Other income	8	14	22
Total interest income	256,729	229,102	351,235
OPERATING EXPENSE:
Subordinated notes and trust preferred interest expense			5,498
Stock based compensation expense (includes restricted stock)	11,765	12,572	12,607
Other expenses	1,968	1,993	1,495
Total operating expense	13,733	14,565	19,600
INCOME BEFORE INCOME TAX BENEFIT AND EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES	242,996	214,537	331,635
FEDERAL INCOME TAX BENEFIT	1,927	1,886	7,202
INCOME BEFORE EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES	244,923	216,423	338,837
EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES	279,593	302,874	190,067
NET INCOME	$ 524,516	$ 519,297	$ 528,904

Parent Company Only Financial_5

Parent Company Only Financial Statements - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Statement of Income Captions [Line Items]
Net income	$ 524,516	$ 519,297	$ 528,904
Securities available for sale:
Change in unrealized (losses) gains during the period	(6,686)	1,316	212
Total other comprehensive (loss) income	(6,686)	1,316	212
Deferred tax benefit (expense) related to other comprehensive (loss) income	1,404	(276)	(45)
Other comprehensive (loss) income, net of tax	(5,282)	1,040	167
Comprehensive income	519,234	520,337	529,071
Parent Company [Member]
Condensed Statement of Income Captions [Line Items]
Net income	524,516	519,297	528,904
Securities available for sale:
Change in unrealized (losses) gains during the period	(6,686)	1,316	212
Total other comprehensive (loss) income	(6,686)	1,316	212
Deferred tax benefit (expense) related to other comprehensive (loss) income	1,404	(276)	(45)
Other comprehensive (loss) income, net of tax	(5,282)	1,040	167
Comprehensive income	$ 519,234	$ 520,337	$ 529,071

Parent Company Only Financial_6

Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 11, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		$ 524,516	$ 519,297	$ 528,904
Adjustments to reconcile net income to net cash provided by operating activities:
Stock based compensation expense (includes restricted stock)		11,765	12,572	12,607
(Increase) decrease in accrued interest receivable and other assets		(85,209)	61,326	29,112
Decrease in accrued interest payable and other liabilities		(16,036)	(2,014)	(44,075)
Net cash provided by operating activities		506,526	694,728	582,321
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid for acquisitions	$ (93,400)
Net cash used in investing activities		(1,963,627)	(2,724,903)	(1,274,308)
CASH FLOWS FROM FINANCING ACTIVITIES:
Redemption of subordinated notes				(125,000)
Repurchase of common stock		(65,721)	(52,089)	(115,161)
Payments of cash dividends		(193,140)	(184,253)	(173,823)
Net cash (used in) provided by financing activities		(666,746)	3,234,606	1,461,428
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		(2,123,847)	1,204,431	769,441
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		2,547,980	1,343,549	574,108
CASH AND CASH EQUIVALENTS, END OF PERIOD		424,133	2,547,980	1,343,549
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		524,516	519,297	528,904
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries		(279,593)	(302,874)	(190,067)
Stock based compensation expense (includes restricted stock)		11,765	12,572	12,607
(Increase) decrease in accrued interest receivable and other assets		2,515	3,649	(1,667)
Decrease in accrued interest payable and other liabilities				(1,987)
Net cash provided by operating activities		259,203	232,644	347,790
CASH FLOWS FROM FINANCING ACTIVITIES:
Redemption of subordinated notes				(125,000)
Repurchase of common stock		(65,721)	(52,089)	(115,161)
Payments of cash dividends		(193,140)	(184,253)	(173,823)
Net cash (used in) provided by financing activities		(258,861)	(236,342)	(413,984)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		342	(3,698)	(66,194)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		3,548	7,246	73,440
CASH AND CASH EQUIVALENTS, END OF PERIOD		$ 3,890	$ 3,548	$ 7,246