Prosperity Bancshares (PB) 10-Q 7 Aug 23 2023 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2023	Aug. 01, 2023
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
Document Type	10-Q
Document Period End Date	Jun. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding (in shares)		93,722,454
Entity Current Reporting Status	Yes
Entity File Number	001-35388
Entity Incorporation, State or Country Code	TX
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 Shell Company	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock, par value $1.00 per share
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks	$ 396,848	$ 423,832
Federal funds sold	181	301
Total cash and cash equivalents	397,029	424,133
Available for sale securities, at fair value	462,013	456,502
Held to maturity securities, at cost (fair value of $11,647,080 and $12,387,125, respectively)	13,205,306	14,019,503
Total securities	13,667,319	14,476,005
Loans held for sale	10,656	554
Loans held for investment	20,494,407	18,098,653
Loans held for investment - Warehouse Purchase Program	1,148,883	740,620
Total loans	21,653,946	18,839,827
Less: allowance for credit losses on loans	(345,209)	(281,576)
Loans, net	21,308,737	18,558,251
Accrued interest receivable	92,265	88,438
Goodwill	3,383,698	3,231,636
Core deposit intangibles, net	71,128	51,348
Bank premises and equipment, net	365,299	339,453
Other real estate owned	3,107	1,963
Bank owned life insurance (BOLI)	382,011	327,439
Federal Home Loan Bank of Dallas stock	107,229	90,025
Other assets	127,309	101,138
TOTAL ASSETS	39,905,131	37,689,829
Deposits:
Noninterest-bearing	10,364,921	10,915,448
Interest-bearing	17,015,965	17,618,083
Total deposits	27,380,886	28,533,531
Other borrowings	4,800,000	1,850,000
Securities sold under repurchase agreements	434,160	428,134
Subordinated debentures	3,093
Accrued interest payable	28,734	4,495
Allowance for credit losses on off-balance sheet credit exposures	36,503	29,947
Other liabilities	253,639	144,348
Total liabilities	32,937,015	30,990,455
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; 93,721,454 issued and outstanding at June 30, 2023; 91,313,615 shares issued and outstanding at December 31, 2022	93,722	91,314
Capital surplus	3,697,524	3,541,924
Retained earnings	3,179,551	3,069,609
Accumulated other comprehensive loss -net unrealized loss on available for sale securities, net of tax benefit of $(713) and $(923), respectively	(2,681)	(3,473)
Total shareholders’ equity	6,968,116	6,699,374
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 39,905,131	$ 37,689,829

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Held to maturity securities, fair value	$ 11,647,080	$ 12,387,125
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)	93,721,454	91,313,615
Common stock, shares outstanding (in shares)	93,721,454	91,313,615
Accumulated other comprehensive loss net unrealized loss on available for sale securities, tax benefit	$ (713)	$ (923)

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
INTEREST INCOME:
Loans, including fees	$ 286,638	$ 192,770	$ 533,756	$ 385,795
Securities	72,053	64,111	145,238	119,122
Federal funds sold and other earning assets	1,757	925	8,763	1,772
Total interest income	360,448	257,806	687,757	506,689
INTEREST EXPENSE:
Deposits	63,964	8,641	111,307	17,395
Other borrowings	57,351	450	91,747	450
Securities sold under repurchase agreements	2,674	244	4,777	429
Total interest expense	123,989	9,335	207,831	18,274
NET INTEREST INCOME	236,459	248,471	479,926	488,415
PROVISION FOR CREDIT LOSSES	18,540		18,540
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	217,919	248,471	461,386	488,415
NONINTEREST INCOME:
Nonsufficient funds (NSF) fees	8,512	8,484	16,607	16,608
Credit card, debit card and ATM card income	9,206	8,880	17,872	17,059
Service charges on deposit accounts	6,078	6,365	12,004	12,576
Trust income	3,358	2,875	6,583	5,578
Mortgage income	661	502	899	957
Brokerage income	1,000	917	2,149	1,809
Net gain on sale or write-down of assets	1,994	1,108	2,115	1,797
Other	8,879	8,463	19,725	16,332
Total noninterest income	39,688	37,594	77,954	72,716
NONINTEREST EXPENSE:
Salaries and employee benefits	84,723	80,371	162,521	159,782
Net occupancy and equipment	8,935	8,039	16,960	15,887
Credit and debit card, data processing and software amortization	10,344	9,246	19,910	18,095
Regulatory assessments and FDIC insurance	5,097	2,851	10,070	5,701
Core deposit intangibles amortization	3,167	2,581	5,541	5,201
Depreciation	4,658	4,539	9,091	9,086
Communications	3,693	3,206	7,155	6,125
Net other real estate (income) expense	(497)	209	(452)	(198)
Merger related expenses	12,891		13,751
Other	12,859	11,836	24,323	23,049
Total noninterest expense	145,870	122,878	268,870	242,728
INCOME BEFORE INCOME TAXES	111,737	163,187	270,470	318,403
PROVISION FOR INCOME TAXES	24,799	34,697	58,838	67,587
NET INCOME	$ 86,938	$ 128,490	$ 211,632	$ 250,816
EARNINGS PER SHARE:
Basic	$ 0.94	$ 1.40	$ 2.30	$ 2.73
Diluted	$ 0.94	$ 1.40	$ 2.30	$ 2.73

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 86,938	$ 128,490	$ 211,632	$ 250,816
Securities available for sale:
Change in unrealized income (loss) during the period	1,006	(598)	1,002	(773)
Total other comprehensive income (loss)	1,006	(598)	1,002	(773)
Deferred tax (expense) benefit related to other comprehensive income (loss)	(211)	125	(210)	162
Other comprehensive income (loss), net of tax	795	(473)	792	(611)
Comprehensive income	$ 87,733	$ 128,017	$ 212,424	$ 250,205

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
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	250,816			250,816
Other comprehensive income (loss)	(611)				(611)
Common stock issued in connection with the issuance of restricted stock awards, net		$ 7	(7)
Common stock issued in connection with the issuance of restricted stock awards, net (in shares)		7,050
Common stock repurchase	(65,721)	$ (982)	(64,739)
Common stock repurchase (in shares)		(981,884)
Stock based compensation expense	5,600			5,600
Cash dividends declared	(95,493)			(95,493)
BALANCE at Jun. 30, 2022	6,521,827	$ 91,196	3,535,877	2,893,556	1,198
BALANCE (in shares) at Jun. 30, 2022		91,195,646
BALANCE at Mar. 31, 2022	6,504,424	$ 92,160	3,597,957	2,812,636	1,671
BALANCE (in shares) at Mar. 31, 2022		92,159,730
Net income	128,490			128,490
Other comprehensive income (loss)	(473)				(473)
Common stock issued in connection with the issuance of restricted stock awards, net		$ 18	(18)
Common stock issued in connection with the issuance of restricted stock awards, net (in shares)		17,800
Common stock repurchase	(65,721)	$ (982)	(64,739)
Common stock repurchase (in shares)		(981,884)
Stock based compensation expense	2,677		2,677
Cash dividends declared	(47,570)			(47,570)
BALANCE at Jun. 30, 2022	6,521,827	$ 91,196	3,535,877	2,893,556	1,198
BALANCE (in shares) at Jun. 30, 2022		91,195,646
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
Net income	211,632			211,632
Other comprehensive income (loss)	792				792
Common stock issued in connection with the issuance of restricted stock awards, net		$ 31	(31)
Common stock issued in connection with the issuance of restricted stock awards, net (in shares)		31,200
Common stock issued in connection with the acquisition of First Bancshares of Texas, Inc	224,347	$ 3,583	220,764
Common stock issued in connection with the acquisition of First Bancshares of Texas, Inc, (in shares)		3,582,675
Common stock repurchase	(72,248)	$ (1,206)	(71,042)
Common stock repurchase (in shares)		(1,206,036)
Stock based compensation expense	5,909		5,909
Cash dividends declared	(101,690)			(101,690)
BALANCE at Jun. 30, 2023	6,968,116	$ 93,722	3,697,524	3,179,551	(2,681)
BALANCE (in shares) at Jun. 30, 2023		93,721,454
BALANCE at Mar. 31, 2023	6,739,117	$ 90,694	3,507,670	3,144,229	(3,476)
BALANCE (in shares) at Mar. 31, 2023		90,693,102
Net income	86,938			86,938
Other comprehensive income (loss)	795				795
Common stock issued in connection with the issuance of restricted stock awards, net		$ 40	(40)
Common stock issued in connection with the issuance of restricted stock awards, net (in shares)		40,450
Common stock issued in connection with the acquisition of First Bancshares of Texas, Inc	224,347	$ 3,583	220,764
Common stock issued in connection with the acquisition of First Bancshares of Texas, Inc, (in shares)		3,582,675
Common stock repurchase	(34,208)	$ (595)	(33,613)
Common stock repurchase (in shares)		(594,773)
Stock based compensation expense	2,743		2,743
Cash dividends declared	(51,616)			(51,616)
BALANCE at Jun. 30, 2023	$ 6,968,116	$ 93,722	$ 3,697,524	$ 3,179,551	$ (2,681)
BALANCE (in shares) at Jun. 30, 2023		93,721,454

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Retained Earnings [Member]
Cash dividend declared, per share (in dollars per share)	$ 0.55	$ 0.52	$ 1.10	$ 1.04

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 211,632	$ 250,816
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization	14,632	14,287
Provision for credit losses	18,540
Net amortization of premium on investments	14,515	24,307
Net gain on sale of other real estate and repossessed assets	(46)	(607)
Net gain on sale or write down of premises and equipment	(2,115)	(1,797)
Net accretion of discount on loans	(3,291)	(5,254)
Net amortization of premium on deposits	(240)	(184)
Net gain on sale of loans	(901)	(852)
Proceeds from sale of loans held for sale	23,783	33,005
Originations of loans held for sale	(32,984)	(28,229)
Stock based compensation expense	5,909	5,600
Decrease (increase) in accrued interest receivable and other assets	7,244	(2,200)
Increase in accrued interest payable and other liabilities	117,994	26,315
Net cash provided by operating activities	374,672	315,207
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of held to maturity securities	857,656	1,173,019
Purchase of held to maturity securities	(3,028)	(3,296,089)
Proceeds from maturities and principal paydowns of available for sale securities	6,703,648	8,985,597
Purchase of available for sale securities	(6,527,199)	(8,981,019)
Originations of Warehouse Purchase Program loans	(6,077,557)	(11,696,395)
Proceeds from pay-offs of Warehouse Purchase Program loans	5,669,294	12,334,471
Net increase in loans held for investment	(793,081)	(233,584)
Purchase of bank premises and equipment	(18,280)	(28,728)
Proceeds from sale of bank premises, equipment and other real estate	3,869	6,217
Proceeds from insurance claims	5,831	729
Net cash used in the purchase of First Bancshares of Texas, Inc.	(24,365)
Net cash used in investing activities	(203,212)	(1,735,782)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net (decrease) increase in noninterest-bearing deposits	(1,242,773)	282,150
Net decrease in interest-bearing deposits	(1,487,619)	(1,188,110)
Net proceeds from other short-term borrowings	2,749,614	300,000
Net (decrease) increase in securities sold under repurchase agreements	(43,848)	33,686
Repurchase of common stock	(72,248)	(65,721)
Payments of cash dividends	(101,690)	(95,493)
Net cash used in financing activities	(198,564)	(733,488)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(27,104)	(2,154,063)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	424,133	2,547,980
CASH AND CASH EQUIVALENTS, END OF PERIOD	397,029	393,917
NONCASH ACTIVITIES:
Acquisition of real estate through foreclosure of collateral	1,690	1,657
SUPPLEMENTAL INFORMATION:
Income taxes paid	68,096	59,882
Interest paid	$ 183,592	$ 18,484

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 86,938	$ 128,490	$ 211,632	$ 250,816

Insider Trading Arrangements

Insider Trading Arrangements	6 Months Ended
	Jun. 30, 2023
Trading Arrangements, by Individual
Title	director or officer
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1. BASIS OF PRESENTATION The consolidated financial statements include the accounts of Prosperity Bancshares, Inc. ® (“Bancshares”) and its wholly-owned subsidiary, Prosperity Bank ® (the “Bank,” and together with Bancshares, the “Company”). All intercompany transactions and balances have been eliminated. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for financial information and with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis; and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. Operating results for the six-month period ended June 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023 or any other period.

Income Per Common Share

Income Per Common Share	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Income Per Common Share	2. INCOME PER COMMON SHARE The following table illustrates the computation of basic and diluted earnings per share: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Amount Per Share Amount Amount Per Share Amount Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 86,938 $ 128,490 $ 211,632 $ 250,816 Basic: Weighted average shares outstanding 92,930 $ 0.94 91,772 $ 1.40 92,073 $ 2.30 91,965 $ 2.73 Diluted: Weighted average shares outstanding 92,930 $ 0.94 91,772 $ 1.40 92,073 $ 2.30 91,965 $ 2.73 There were no stock options outstanding at June 30, 2023 or exercisable during the three and six months ended June 30, 2023 or 2022 that would have had an anti-dilutive effect on the above computation.

New Accounting Standards

New Accounting Standards	6 Months Ended
	Jun. 30, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Standards	3. NEW ACCOUNTING STANDARDS Accounting Standards Updates (“ASU”) ASU 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. The amendments in ASU 2022-02 eliminated the accounting guidance for troubled debt restructurings and enhanced disclosures for certain loan refinancing and restructurings to borrowers experiencing financial difficulty. This guidance was applied on a prospective basis. Additionally, ASU 2022-02 requires entities to disclose current-period gross charge-offs by year of origination. ASU 2022-02 became effective for the Company on January 1, 2023 and did not 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 June 30, 2023, LIBOR was used as an index rate for approximately 83.7 % of the Company’s interest-rate swaps and approximately 0.17 % of the Company’s loan portfolio . As of December 31, 2022, LIBOR was used as an index rate for approximately 88.2 % of the Company’s interest-rate swaps and approximately 1.5 % of the Company’s loan portfolio. The adoption of ASU 2020-04 did not have a significant impact on the Company’s financial statements.

Securities

Securities	6 Months Ended
	Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Securities	4. SECURITIES The amortized cost and fair value of investment securities were as follows: June 30, 2023 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available for Sale Corporate debt securities $ 20,698 $ 1,599 $ ( 446 ) $ 21,851 Collateralized mortgage obligations 345,155 1,066 ( 3,406 ) 342,815 Mortgage-backed securities 99,553 76 ( 2,282 ) 97,347 Total $ 465,406 $ 2,741 $ ( 6,134 ) $ 462,013 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,511 $ — $ ( 125 ) $ 7,386 States and political subdivisions 121,634 938 ( 3,983 ) 118,589 Corporate debt securities 12,000 — ( 5,160 ) 6,840 Collateralized mortgage obligations 281,273 230 ( 23,370 ) 258,133 Mortgage-backed securities 12,782,888 967 ( 1,527,723 ) 11,256,132 Total $ 13,205,306 $ 2,135 $ ( 1,560,361 ) $ 11,647,080 December 31, 2022 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses 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 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 Financial Accounting Standards Board (“FASB”): ASC 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 June 30, 2023, 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 June 30, 2023, 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 June 30, 2023, the Company’s municipal securities represent 0.9 % 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 June 30, 2023 , 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, that have been in a continuous loss position were as follows: June 30, 2023 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) Available for Sale Corporate debt securities $ 5,154 $ ( 446 ) $ — $ — $ 5,154 $ ( 446 ) Collateralized mortgage obligations 53,814 ( 1,108 ) 118,225 ( 2,298 ) 172,039 ( 3,406 ) Mortgage-backed securities 93,054 ( 2,241 ) 1,112 ( 41 ) 94,166 ( 2,282 ) Total $ 152,022 $ ( 3,795 ) $ 119,337 $ ( 2,339 ) $ 271,359 $ ( 6,134 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,386 $ ( 125 ) $ — $ — $ 7,386 $ ( 125 ) States and political subdivisions 58,039 ( 815 ) 39,709 ( 3,168 ) 97,748 ( 3,983 ) Corporate debt securities 6,840 ( 5,160 ) — — 6,840 ( 5,160 ) Collateralized mortgage obligations 58,857 ( 1,863 ) 169,868 ( 21,507 ) 228,725 ( 23,370 ) Mortgage-backed securities 479,880 ( 16,452 ) 10,641,057 ( 1,511,271 ) 11,120,937 ( 1,527,723 ) Total $ 611,002 $ ( 24,415 ) $ 10,850,634 $ ( 1,535,946 ) $ 11,461,636 $ ( 1,560,361 ) December 31, 2022 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (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 ) At June 30, 2023 and December 31, 2022 , there were 850 securities and 174 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 June 30, 2023, 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 $ 15,320 $ 15,181 $ — $ — Due after one year through five years 64,855 64,782 2,550 2,843 Due after five years through ten years 48,892 42,095 18,148 19,008 Due after ten years 12,078 10,757 — — Subtotal 141,145 132,815 20,698 21,851 Mortgage-backed securities and collateralized mortgage obligations 13,064,161 11,514,265 444,708 440,162 Total $ 13,205,306 $ 11,647,080 $ 465,406 $ 462,013 The Company recorded no gain or loss on the sale of securities for the three and six months ended June 30, 2023 and 2022. As of June 30, 2023, the Company did not own any non-agency collateralized mortgage obligations. At June 30, 2023 and December 31, 2022 , 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 $ 10.60 billion and $ 7.87 billion and a fair value of $ 9.33 billion and $ 6.90 billion at June 30, 2023 and December 31, 2022 , 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	6 Months Ended
	Jun. 30, 2023
Receivables [Abstract]
Loans and Allowance for Credit Losses	5. LOANS AND ALLOWANCE FOR CREDIT LOSSES The loan portfolio consists of various types of loans and is categorized by major type as follows: June 30, 2023 December 31, 2022 (Dollars in thousands) Residential mortgage loans held for sale $ 10,656 $ 554 Commercial and industrial 2,746,055 2,594,742 Real estate: Construction, land development and other land loans 3,215,016 2,805,438 1-4 family residential (includes home equity) 7,747,227 6,740,670 Commercial real estate (includes multi-family residential) 5,676,526 4,986,211 Farmland 584,962 518,095 Agriculture 219,414 169,938 Consumer and other 305,207 283,559 Total loans held for investment, excluding Warehouse Purchase Program 20,494,407 18,098,653 Warehouse Purchase Program 1,148,883 740,620 Total loans, including Warehouse Purchase Program $ 21,653,946 $ 18,839,827 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 81.1 % and 80.3 % of the Company’s total loan portfolio, excluding Warehouse Purchase Program loans, at June 30, 2023 and December 31, 2022, respectively. As of June 30, 2023 and December 31, 2022 , 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 June 30, 2023 and December 31, 2022 , loans outstanding to directors, officers and their affiliates totaled $ 535 thousand and $ 547 thousand, 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 As of and for the 31, 2022 (Dollars in thousands) Beginning balance on January 1 $ 547 $ 6,524 New loans 3 54 Repayments ( 15 ) ( 6,031 ) Ending balance $ 535 $ 547 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: June 30, 2023 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans Total Loans (Dollars in thousands) Construction, land development and other land loans $ 12,911 $ — $ 12,911 $ 1,860 $ 3,200,245 $ 3,215,016 Warehouse Purchase Program loans — — — — 1,148,883 1,148,883 Agriculture and agriculture real estate (includes farmland) 6,276 86 6,362 1,199 796,815 804,376 1-4 family (includes home equity) (1) 24,476 — 24,476 19,125 7,714,282 7,757,883 Commercial real estate (includes multi-family residential) 6,006 — 6,006 13,266 5,657,254 5,676,526 Commercial and industrial 8,959 1,658 10,617 22,229 2,713,209 2,746,055 Consumer and other 294 — 294 44 304,869 305,207 Total $ 58,922 $ 1,744 $ 60,666 $ 57,723 $ 21,535,557 $ 21,653,946 December 31, 2022 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans 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 (1) Includes $ 10.7 million and $ 554 thousand of residential mortgage loans held for sale at June 30, 2023 and December 31, 2022 , respectively. The following table presents information regarding nonperforming assets as of the dates indicated: June 30, 2023 December 31, 2022 (Dollars in thousands) Nonaccrual loans (1) (3) $ 57,723 $ 19,614 (2) Accruing loans 90 or more days past due 1,744 5,917 Total nonperforming loans 59,467 25,531 Repossessed assets 153 — Other real estate 3,107 1,963 Total nonperforming assets $ 62,727 $ 27,494 Nonperforming assets to total loans and other real estate 0.29 % 0.15 % Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate 0.31 % 0.15 % Nonaccrual loans to total loans 0.27 % 0.10 % Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans 0.28 % 0.11 % (1) ASU 2022-02 became effective for the Company on January 1, 2023. (2) Includes troubled debt restructurings of $ 4.6 million as of December 31, 2022 . (3) There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented. The Company had $ 62.7 million in nonperforming assets at June 30, 2023 compared with $ 27.5 million at December 31, 2022. This increase was primarily due to the merger of First Bancshares of Texas, Inc. (“First Bancshares”) into Bancshares and the subsequent merger of its wholly owned subsidiary FirstCapital Bank of Texas, N.A. (“FirstCapital Bank”) into the Bank, (collectively, the “Merger”). Nonperforming assets were 0.29 % of total loans and other real estate at June 30, 2023 and 0.15 % of total loans and other real estate at December 31, 2022 . The Company had $ 57.7 million in nonaccrual loans at June 30, 2023 compared with $ 19.6 million at December 31, 2022. 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. Projected default rates, loss given default, and recovery rates for purchased credit deteriorated (“PCD”) loans primarily impact the related allowance, as opposed to the fair value mark. During the valuation process, the Company identified PCD and Non-PCD loans in the acquired loan portfolios. Loans acquired with evidence of credit quality deterioration since origination as of the acquisition date were accounted for as PCD. 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 as of the acquisition date when compared to the origination 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 and Non-PCD loans will be recognized based on payment structure and the contractual maturity of individual loans. PCD Loans. The recorded investment in PCD loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of June 30, 2023 and December 31, 2022. June 30, 2023 December 31, 2022 (Dollars in thousands) PCD loans: Outstanding balance $ 661,349 $ 63,383 Discount ( 10,110 ) ( 3,361 ) Recorded investment $ 651,239 $ 60,022 Changes in the accretable yield for acquired PCD loans for the three and six months ended June 30, 2023 and 2022 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (Dollars in thousands) Balance at beginning of period $ 3,022 $ 4,317 $ 3,361 $ 4,838 Additions 8,336 — 8,336 — Adjustments ( 70 ) — ( 70 ) — Accretion ( 1,178 ) ( 324 ) ( 1,517 ) ( 845 ) Balance at June 30, $ 10,110 $ 3,993 $ 10,110 $ 3,993 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 June 30, 2023, 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 sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of June 30, 2023 and December 31, 2022. June 30, 2023 December 31, 2022 (Dollars in thousands) Non-PCD loans: Outstanding balance $ 2,128,501 $ 1,319,507 Discount ( 23,052 ) ( 2,233 ) Recorded investment $ 2,105,449 $ 1,317,274 Changes in the discount accretion for Non-PCD loans for the three and six months ended June 30, 2023 and 2022 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (Dollars in thousands) Balance at beginning of period $ 1,701 $ 3,469 $ 2,233 $ 8,143 Addition 22,593 — 22,593 — Accretion ( 1,242 ) 265 ( 1,774 ) ( 4,409 ) Balance at June 30, $ 23,052 $ 3,734 $ 23,052 $ 3,734 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 tables present loans by risk grade, by category of loan and year of origination/renewal at June 30, 2023. Term Loans Amortized Cost Basis by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Construction, Land Development and Other Land Loans Grade 1 $ 613 $ — $ — $ — $ — $ — $ — $ — $ 613 Grade 2 675 183 — — — 75 — — 933 Grade 3 235,834 1,202,677 618,940 241,563 23,496 178,408 170,350 — 2,671,268 Grade 4 9,564 91,646 84,853 34,908 6,293 12,364 5,514 — 245,142 Grade 5 — 1,119 4,399 — 18,720 637 998 — 25,873 Grade 6 — — 5,572 3,012 — 1,190 — — 9,774 Grade 7 — — — — — 1,588 272 — 1,860 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 43,047 144,306 35,528 7,173 3,581 7,516 18,402 — 259,553 Total $ 289,733 $ 1,439,931 $ 749,292 $ 286,656 $ 52,090 $ 201,778 $ 195,536 $ — $ 3,215,016 Current-period gross write-offs $ — $ 77 $ — $ — $ — $ — $ — $ — $ 77 Agriculture and Agriculture Real Estate (includes Farmland) Grade 1 $ 854 $ 1,372 $ 289 $ 363 $ 40 $ 595 $ 9,109 $ 9 $ 12,631 Grade 2 — 75 106 — — 1,094 52 — 1,327 Grade 3 101,112 217,319 89,827 49,421 39,434 108,656 86,124 547 692,440 Grade 4 8,652 11,841 19,339 4,343 587 9,407 16,788 670 71,627 Grade 5 213 800 291 — 441 1,522 — — 3,267 Grade 6 — — 119 — — 478 — — 597 Grade 7 — — 1,014 — 17 168 — — 1,199 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 207 2,358 1,795 3,851 1,213 3,746 8,118 — 21,288 Total $ 111,038 $ 233,765 $ 112,780 $ 57,978 $ 41,732 $ 125,666 $ 120,191 $ 1,226 $ 804,376 Current-period gross write-offs $ — $ — $ — $ 113 $ — $ — $ — $ — $ 113 1-4 Family (includes Home Equity) (1) Grade 1 $ 77 $ 161 $ — $ 111 $ — $ — $ — $ — $ 349 Grade 2 1,969 1,430 160 256 33 3,432 110 — 7,390 Grade 3 833,650 1,904,045 2,147,286 1,091,293 452,578 1,060,720 103,023 1,997 7,594,592 Grade 4 4,917 19,150 25,097 6,081 8,484 52,762 3,003 — 119,494 Grade 5 — 62 — 123 4,443 4,939 — — 9,567 Grade 6 — — — 15 142 1,821 — — 1,978 Grade 7 — 2,538 3,966 2,521 1,666 8,434 — — 19,125 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 159 1,389 520 439 644 2,237 — — 5,388 Total $ 840,772 $ 1,928,775 $ 2,177,029 $ 1,100,839 $ 467,990 $ 1,134,345 $ 106,136 $ 1,997 $ 7,757,883 Current-period gross write-offs $ — $ — $ 50 $ 26 $ — $ 25 $ — $ — $ 101 Term Loans Amortized Cost Basis by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Commercial Real Estate (includes Multi-Family Residential) Grade 1 $ — $ — $ — $ — $ — $ — $ 72 $ — $ 72 Grade 2 — 6,281 — 494 — 2,570 — — 9,345 Grade 3 286,506 913,630 689,196 504,351 323,489 1,210,720 87,435 159 4,015,486 Grade 4 16,871 106,653 153,488 182,227 105,228 647,105 17,722 — 1,229,294 Grade 5 — — 366 — 15,009 59,345 818 — 75,538 Grade 6 — — 386 12,069 17,644 89,426 — — 119,525 Grade 7 — — — — 3,653 9,613 — — 13,266 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 11,270 43,268 35,119 8,250 7,885 107,679 529 — 214,000 Total $ 314,647 $ 1,069,832 $ 878,555 $ 707,391 $ 472,908 $ 2,126,458 $ 106,576 $ 159 $ 5,676,526 Current-period gross write-offs $ — $ 14,975 $ — $ — $ — $ — $ — $ — $ 14,975 Commercial and Industrial Grade 1 $ 8,184 $ 12,760 $ 9,897 $ 4,340 $ 1,934 $ 6,301 $ 33,881 $ 25 $ 77,322 Grade 2 676 9,264 327 228 — 3,954 2,767 — 17,216 Grade 3 142,559 301,751 188,560 77,413 76,000 166,299 1,056,888 1,632 2,011,102 Grade 4 94,245 21,721 7,764 10,075 10,549 115,265 149,350 213 409,182 Grade 5 — 22,546 11,078 1,277 439 1,052 8,434 — 44,826 Grade 6 44 425 300 1,006 1,463 1,041 8,985 34 13,298 Grade 7 — 15,602 72 1,311 171 1,202 3,853 18 22,229 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 8,619 29,465 13,230 5,188 5,813 1,660 86,905 — 150,880 Total $ 254,327 $ 413,534 $ 231,228 $ 100,838 $ 96,369 $ 296,774 $ 1,351,063 $ 1,922 $ 2,746,055 Current-period gross write-offs $ — $ 629 $ 20 $ 24 $ — $ 15 $ 554 $ — $ 1,242 Consumer and Other Grade 1 $ 7,023 $ 8,146 $ 4,156 $ 3,019 $ 1,433 $ 6,911 $ 1,777 $ — $ 32,465 Grade 2 94 14,212 — 422 — 2,420 5,007 — 22,155 Grade 3 56,455 47,120 30,581 28,933 13,473 13,799 51,660 — 242,021 Grade 4 67 39 1,233 1,144 1,348 632 3,924 — 8,387 Grade 5 — — — — — — 5 — 5 Grade 6 — — — — — — — — — Grade 7 — — — 40 4 — — — 44 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 19 45 11 29 — 26 — 130 Total $ 63,639 $ 69,536 $ 36,015 $ 33,569 $ 16,287 $ 23,762 $ 62,399 $ — $ 305,207 Current-period gross write-offs $ 2,414 $ 33 $ 4 $ — $ 5 $ 20 $ 40 $ — $ 2,516 Term Loans Amortized Cost Basis by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Warehouse Purchase Program Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — — — — — — — — Grade 3 1,148,883 — — — — — — — 1,148,883 Grade 4 — — — — — — — — — Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 1,148,883 $ — $ — $ — $ — $ — $ — $ — $ 1,148,883 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Total Grade 1 $ 16,751 $ 22,439 $ 14,342 $ 7,833 $ 3,407 $ 13,807 $ 44,839 $ 34 $ 123,452 Grade 2 3,414 31,445 593 1,400 33 13,545 7,936 — 58,366 Grade 3 2,804,999 4,586,542 3,764,390 1,992,974 928,470 2,738,602 1,555,480 4,335 18,375,792 Grade 4 134,316 251,050 291,774 238,778 132,489 837,535 196,301 883 2,083,126 Grade 5 213 24,527 16,134 1,400 39,052 67,495 10,255 — 159,076 Grade 6 44 425 6,377 16,102 19,249 93,956 8,985 34 145,172 Grade 7 — 18,140 5,052 3,872 5,511 21,005 4,125 18 57,723 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 63,302 220,805 86,237 24,912 19,165 122,838 113,980 — 651,239 Total $ 3,023,039 $ 5,155,373 $ 4,184,899 $ 2,287,271 $ 1,147,376 $ 3,908,783 $ 1,941,901 $ 5,304 $ 21,653,946 Current-period gross write-offs $ 2,414 $ 15,714 $ 74 $ 163 $ 5 $ 60 $ 594 $ — $ 19,024 (1) Includes $ 10.7 million of residential mortgage loans held for sale at June 30, 2023 . 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 June 30, 2023 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 agriculture 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 agriculture loans, the operating results, experience and financial capability of the borrower, historical and expected market conditions and the value, nature and marketability of collateral. In addition, for each category, the Company considers secondary sources of income and the financial strength and credit history of the borrower and any guarantors. In determining the amount of the general valuation allowance, management considers factors such as historical lifetime loan loss experience, concentration risk of specific loan types, the volume, growth and composition of the Company’s loan 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 Company’s loan portfolio through its internal loan review process, other qualitative risk factors both internal and external to the Company and other relevant factors in accordance with ASC Topic 326, “ Financial Instruments – Credit Losses.” Historical lifetime loan loss experience is determined by utilizing an open-pool (“cumulative loss rate”) methodology. Adjustments to the historical lifetime loan loss experience are made for differences in current loan pool risk characteristics such as portfolio concentrations, delinquency, non-accrual, and watch list levels, as well as changes in current and forecasted economic conditions such as unemployment rates, property and collateral values, and other indices relating to economic activity. The utilization of reasonable and supportable forecasts includes an immediate reversion to lifetime historical loss rates. Based on a review of these factors for each loan type, the Company applies an estimated percentage to the outstanding balance of each loan type, excluding any loan that has a specific reserve. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. The following table details activity in the allowance for credit losses on loans by category of loan for the three and six months ended June 30, 2023 and 2022. 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: Three Months Ended Balance March 31, 2023 $ 80,561 $ 8,061 $ 62,538 $ 67,972 $ 57,296 $ 5,763 $ 282,191 Initial allowance on loans purchased with credit deterioration 15,237 2,914 1,590 21,002 26,332 24 67,099 Provision for credit losses on loans ( 3,890 ) 201 3,524 12,748 ( 1,498 ) 899 11,984 Charge-offs ( 77 ) ( 113 ) ( 36 ) ( 14,975 ) ( 341 ) ( 1,291 ) ( 16,833 ) Recoveries 27 191 106 18 181 245 768 Net (charge-offs) recoveries ( 50 ) 78 70 ( 14,957 ) ( 160 ) ( 1,046 ) ( 16,065 ) Balance June 30, 2023 $ 91,858 $ 11,254 $ 67,722 $ 86,765 $ 81,970 $ 5,640 $ 345,209 Six Months Ended Balance December 31, 2022 $ 78,853 $ 7,699 $ 60,795 $ 66,272 $ 62,319 $ 5,638 $ 281,576 Initial allowance on loans purchased with credit deterioration 15,237 2,914 1,590 21,002 26,332 24 67,099 Provision for credit losses ( 2,195 ) 557 5,127 14,447 ( 7,993 ) 2,041 11,984 Charge-offs ( 77 ) ( 113 ) ( 101 ) ( 14,975 ) ( 1,242 ) ( 2,516 ) ( 19,024 ) Recoveries 40 197 311 19 2,554 453 3,574 Net charge-offs ( 37 ) 84 210 ( 14,956 ) 1,312 ( 2,063 ) ( 15,450 ) Balance June 30, 2023 $ 91,858 $ 11,254 $ 67,722 $ 86,765 $ 81,970 $ 5,640 $ 345,209 Allowance for credit losses on loans: Three Months Ended Balance March 31, 2022 $ 61,007 $ 7,903 $ 59,368 $ 74,103 $ 76,303 $ 6,479 $ 285,163 Provision for credit losses 2,717 426 696 ( 3,697 ) ( 806 ) 664 — Charge-offs — — — — ( 192 ) ( 1,268 ) ( 1,460 ) Recoveries 5 9 32 ( 395 ) 389 216 256 Net charge-offs 5 9 32 ( 395 ) 197 ( 1,052 ) ( 1,204 ) Balance June 30, 2022 $ 63,729 $ 8,338 $ 60,096 $ 70,011 $ 75,694 $ 6,091 $ 283,959 Six Months Ended Balance December 31, 2021 $ 58,897 $ 7,759 $ 56,710 $ 75,005 $ 80,412 $ 7,597 $ 286,380 Provision for credit losses 5,257 467 3,441 ( 4,965 ) ( 4,901 ) 701 — Charge-offs ( 435 ) ( 155 ) ( 100 ) ( 39 ) ( 663 ) ( 2,675 ) ( 4,067 ) Recoveries 10 267 45 10 846 468 1,646 Net charge-offs ( 425 ) 112 ( 55 ) ( 29 ) 183 ( 2,207 ) ( 2,421 ) Balance June 30, 2022 $ 63,729 $ 8,338 $ 60,096 $ 70,011 $ 75,694 $ 6,091 $ 283,959 The allowance for credit losses on loans as of June 30, 2023 totaled $ 345.2 million or 1.59 % of total loans, including acquired loans with discounts, an increase of $ 63.6 million or 22.6 % compared to the allowance for credit losses on loans totaling $ 281.6 million or 1.49 % of total loans, including acquired loans with discounts, as of December 31, 2022 . The provision for credit losses was $ 18.5 million for the three and six months ended June 30, 2023 compared to no provision for credit losses for the three and six months ended June 30, 2022. As a result of the loans acquired in the Merger that was completed on May 1, 2023, the second quarter of 2023 included a $ 12.0 million provision for credit losses on loans and a $ 6.5 million provision for credit losses on off-balance sheet credit exposures. Net charge-offs were $ 16.1 million and $ 15.5 million for the three and six months ended June 30, 2023 , respectively, compared to net charge-offs of $ 1.2 million and $ 2.4 million for the three and six months ended June 30, 2022, respectively. Net charge-offs for the three and six months ended June 30, 2023 both included $ 15.0 million related to one commercial real estate loan obtained in a previous merger. Additionally, $ 3.5 million and $ 3.7 million of specific reserves on resolved PCD loans without any related charge-offs was released to the general reserve for the three and six months ended June 30, 2023, respectively. 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. As of June 30, 2023 and December 31, 2022 , the Company had $ 36.5 million and $ 29.9 million in allowance for credit losses on off-balance sheet credit exposures, respectively; with the increase primarily due to the Merger. The allowance for credit losses on off-balance sheet credit exposures is a separate line item on the Company’s consolidated balance sheet. As of June 30, 2023 , the Company had $ 2.57 billion in commitments expected to fund. The following table represents a rollforward of the allowance for credit losses on off-balance sheet credit exposures for the periods shown. Three Months Ended June 30 Six Months Ended June 30 2023 2022 2023 2022 (Dollars in thousands) Balance at beginning of period $ 29,947 $ 29,947 $ 29,947 $ 29,947 Provision for cre

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2023
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 and liabilities measured at fair value on a recurring basis: As of June 30, 2023 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Corporate debt securities $ — $ 21,851 $ — $ 21,851 Collateralized mortgage obligations — 342,815 — 342,815 Mortgage-backed securities — 97,347 — 97,347 Total $ — $ 462,013 $ — $ 462,013 Derivative financial instruments: Interest rate lock commitments $ — $ 203 $ — $ 203 Forward mortgage-backed securities trades — 122 — 122 Loan customer counterparty — — — — Financial institution counterparty — 5,318 — 5,318 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ 1 $ — $ 1 Forward mortgage-backed securities trades — 10 — 10 Loan customer counterparty — 5,318 — 5,318 Financial institution counterparty — — — — As of 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 — — — — 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, which are included as loans held for investment. For the three and six months ended June 30, 2023 , the Company had additions to other real estate owned of $ 1.1 million and $ 1.6 million, respectively, of which $ 1.1 million were outstanding as of June 30, 2023. For the three and six months ended June 30, 2023 , the Company had additions to impaired loans of $ 17.1 million and $ 22.5 million, respectively, of which $ 17.1 million and $ 20.8 million, respectively, were outstanding as of June 30, 2023. The remaining financial assets and liabilities measured at fair value on a non-recurring basis that were recorded in 2023 and remained outstanding at June 30, 2023 were not significant. The following tables present carrying and fair value information of financial instruments as of the dates indicated: As of June 30, 2023 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 396,848 $ 396,848 $ — $ — $ 396,848 Federal funds sold 181 181 — — 181 Held to maturity securities 13,205,306 — 11,647,080 — 11,647,080 Loans held for sale 10,656 — 10,656 — 10,656 Loans held for investment, net of allowance 20,149,198 — — 19,488,281 19,488,281 Loans held for investment - Warehouse Purchase Program 1,148,883 — 1,148,883 — 1,148,883 Other real estate owned 3,107 — 3,107 — 3,107 Liabilities Deposits: Noninterest-bearing $ 10,364,921 $ — $ 10,364,921 $ — $ 10,364,921 Interest-bearing 17,015,965 — 16,963,645 — 16,963,645 Other borrowings 4,800,000 — 4,712,812 — 4,712,812 Securities sold under repurchase agreements 434,160 — 434,102 — 434,102 Subordianted debentures 3,093 — 3,088 — 3,088 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 The following is a description of the fair value estimates, methods and assumptions that are used by the Company in estimating the fair values of financial instruments. 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 June 30, 2023 . 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.

Goodwill and Core Deposit Intan

Goodwill and Core Deposit Intangibles	6 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Core Deposit Intangibles	7. GOODWILL AND CORE DEPOSIT INTANGIBLES Changes in the carrying amount of the Company’s goodwill and core deposit intangibles for the six months ended June 30, 2023 and the year ended December 31, 2022 were as follows: Goodwill Core Deposit Intangibles (Dollars in thousands) 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 Less: Amortization — ( 5,541 ) Add: First Bancshares Merger 152,062 25,321 Balance as of June 30, 2023 $ 3,383,698 $ 71,128 Goodwill is recorded as of the acquisition date of each entity. The Company may record subsequent adjustments to goodwill for amounts undeterminable at acquisition date, such as deferred taxes and real estate valuations, and therefore the goodwill amounts may change accordingly. The Company initially records the total premium paid on acquisitions as goodwill. After finalizing the valuation, core deposit intangibles are identified and reclassified from goodwill to core deposit intangibles on the balance sheet. This reclassification has no effect on total assets, liabilities, shareholders’ equity, net income or cash flows. 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. As of June 30, 2023 , there was no impairment recorded on goodwill and core deposit intangibles. The measurement period for the Company to determine the fair value of acquired identifiable assets and assumed liabilities will be at the end of the earlier of (1) twelve months from the date of acquisition or (2) as soon as the Company receives the information it was seeking about facts and circumstances that existed as of the date of acquisition. 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 . Amortization expense related to intangible assets totaled $ 3.2 million and $ 2.6 million for the three months ended June 30, 2023 and 2022 , respectively, and $ 5.5 million and $ 5.2 million for the six months ended June 30, 2023 and 2022, respectively. The estimated aggregate future amortization expense for core deposit intangibles remaining as of June 30, 2023 is as follows (dollars in thousands): Remaining 2023 $ 7,135 2024 12,813 2025 11,409 2026 10,376 2027 9,288 Thereafter 20,107 Total $ 71,128

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	8. STOCK–BASED COMPENSATION At June 30, 2023, Bancshares had one active stock-based incentive compensation plan with awards outstanding. On March 3, 2020, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2020 Stock Incentive Plan (the “2020 Plan”), which was approved by Bancshares' 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 June 30, 2023 , 65,432 shares of common stock had been issued pursuant to vested restricted stock awards and 510,093 shares of unvested restricted stock have been granted under the 2020 Plan. As of June 30, 2023 , the Company had no stock options outstanding. Stock-based compensation expense related to restricted stock was $ 2.7 million during the three months ended June 30, 2023 and 2022 and $ 5.9 million and $ 5.6 million during the six months ended June 30, 2023 and 2022, respectively. As of June 30, 2023 , there was $ 13.3 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 1.76 years.

Contractual Obligations and Off

Contractual Obligations and Off-Balance Sheet Items	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Contractual Obligations and Off-Balance Sheet Items	9. CONTRACTUAL OBLIGATIONS AND OFF-BALANCE SHEET ITEMS Contractual Obligations The Company’s contractual obligations and other commitments to make future payments (other than deposit obligations and securities sold under repurchase agreements) as of June 30, 2023 are summarized below. The Company’s future cash payments associated with its contractual obligations pursuant to its subordinated debentures, the Federal Reserve's Bank Term Funding Program (“BTFP”) and Federal Home Loan Bank (“FHLB”) advances as of June 30, 2023 are summarized below. The future interest payments were calculated using the current rate in effect at June 30, 2023. Payments for the subordinated debentures include interest of $ 2.6 million that will be due over the future periods. In July 2023, the Company gave irrevocable notice of its intent to redeem the Subordinated Debentures on September 18, 2023. Payments under the BTFP include interest of $ 141.6 million that will be due over the future periods. These payments do not include prepayment options that may be available to the Company. 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) Subordinated debentures $ 244 $ 487 $ 487 $ 4,512 $ 5,730 Bank Term Funding Program 3,141,614 — — — 3,141,614 Federal Home Loan Bank advances 1,800,000 — — — 1,800,000 $ 4,941,858 $ 487 $ 487 $ 4,512 $ 4,947,344 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 17 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 was $ 688 thousand and $ 800 thousand for the three months ended June 30, 2023 and 2022, and $ 1.5 million and $ 1.6 million for the six months ended June 30, 2023 and 2022, respectively. As of June 30, 2023 , operating lease ROU assets and lease liabilities were approximately $ 40.7 million. ROU assets and lease liabilities were classified as other assets and other liabilities, respectively. As of June 30, 2023 , the weighted average of remaining lease terms of the Company’s operating leases was 5.2 years. The weighted average discount rate used to determine the lease liabilities as of June 30, 2023 for the Company’s operating leases was 2.7 %. Cash paid for the Company’s operating leases was $ 3.1 million and $ 2.7 million, for the three months ended June 30, 2023 and 2022 , respectively, and was $ 5.9 million and $ 5.5 million for the six months ended June 30, 2023 and 2022, respectively. During the six months ended June 30, 2023 , the Company obtained $ 3.0 million in ROU assets in exchange for lease liabilities for six operating leases, four of which, reflecting $ 2.7 million in ROU assets, were related to the Merger. The Company’s future undiscounted cash payments associated with its operating leases as of June 30, 2023 are summarized below (dollars in thousands). Remaining 2023 $ 5,469 2024 10,229 2025 9,663 2026 8,536 2027 5,568 2028 2,588 Thereafter 5,283 Total undiscounted lease payments $ 47,336 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 June 30, 2023 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 $ 70,552 $ 8,001 $ 2,578 $ 26 $ 81,157 Unused capacity on Warehouse Purchase Program loans 959,117 — — — 959,117 Commitments to extend credit 1,865,681 1,007,818 320,147 1,948,768 5,142,414 Total $ 2,895,350 $ 1,015,819 $ 322,725 $ 1,948,794 $ 6,182,688 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 June 30, 2023 and December 31, 2022 , this allowance, reported as a separate line item on the Company’s consolidated balance sheet, totaled $ 36.5 million and $ 29.9 million, respectively. The increase in the allowance was primarily due to the Merger.

Other Comprehensive Income

Other Comprehensive Income	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Other Comprehensive Income	10. OTHER COMPREHENSIVE INCOME The tax effects allocated to each component of other comprehensive income (loss) were as follows: Three Months Ended June 30, 2023 2022 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive income (loss): Securities available for sale: Change in unrealized gain (loss) during period $ 1,006 $ ( 211 ) $ 795 $ ( 598 ) $ 125 $ ( 473 ) Total securities available for sale 1,006 ( 211 ) 795 ( 598 ) 125 ( 473 ) Total other comprehensive income (loss) $ 1,006 $ ( 211 ) $ 795 $ ( 598 ) $ 125 $ ( 473 ) Six Months Ended June 30, 2023 2022 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive income (loss): Securities available for sale: Change in unrealized gain (loss) during period $ 1,002 $ ( 210 ) $ 792 $ ( 773 ) $ 162 $ ( 611 ) Total securities available for sale 1,002 ( 210 ) 792 ( 773 ) 162 ( 611 ) Total other comprehensive income (loss) $ 1,002 $ ( 210 ) $ 792 $ ( 773 ) $ 162 $ ( 611 ) Activity in accumulated other comprehensive income (loss) associated with securities available for sale, net of tax, was as follows: Securities Available Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) Balance at December 31, 2022 $ ( 3,473 ) $ ( 3,473 ) Other comprehensive income 792 792 Balance at June 30, 2023 $ ( 2,681 ) $ ( 2,681 ) Balance at December 31, 2021 $ 1,809 $ 1,809 Other comprehensive loss ( 611 ) ( 611 ) Balance at June 30, 2022 $ 1,198 $ 1,198

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	11. DERIVATIVE FINANCIAL INSTRUMENTS The following table provides the outstanding notional balances and fair values of outstanding derivative positions at June 30, 2023 and December 31, 2022. June 30, 2023 December 31, 2022 Outstanding Asset Liability Derivative Outstanding Asset Liability Derivative (Dollars in thousands) Interest rate lock commitments $ 16,447 $ 203 $ 1 $ 4,599 $ 94 $ 6 Forward mortgage-backed securities trades 27,250 122 10 5,250 31 — Commercial loan interest rate swaps and caps: Loan customer counterparty 67,657 — 5,318 93,214 — 5,522 Financial institution counterparty 67,657 5,318 — 93,214 5,522 — 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 agrees 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 June 30, 2023 and December 31, 2022 are presented in the following table. Weighted-Average Interest Rate June 30, 2023 December 31, 2022 Received Paid Received Paid Loan customer counterparty 3.08 % 6.59 % 3.05 % 5.18 % 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 $ 5.3 million at June 30, 2023 and $ 5.5 million at December 31, 2022 . 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 $ 358 thousand at June 30, 2023 . 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 at June 30, 2023 and December 31, 2022. 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 three and six months ended June 30, 2023 and 2022 was as follows: Three Months Ended June 30, Six Months Ended June 30, Derivatives not designated as hedging instruments 2023 2022 2023 2022 (Dollars in thousands) Interest rate lock commitments $ 84 $ 173 $ 114 $ ( 5 ) Forward mortgage-backed securities trades 208 163 158 479

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2023
Business Combinations [Abstract]
Acquisitions	12. ACQUISITIONS Merger of First Bancshares of Texas, Inc . — Effective May 1, 2023, the Company completed the Merger of First Bancshares into Bancshares and the subsequent merger of its wholly owned subsidiary FirstCapital Bank into the Bank. FirstCapital Bank operated 16 full-service banking offices in six 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 March 31, 2023, First Bancshares, on a consolidated basis, reported total assets of $ 2.14 billion, total loans of $ 1.65 billion and total deposits of $ 1.71 billion. The acquisition was not considered significant to the Company’s financial statements and therefore pro forma financial data and related disclosures are not included. Pursuant to the terms of the definitive agreement, Bancshares issued 3,583,370 shares of its common stock with a closing price of $ 62.62 per share plus approximately $ 91.5 million in cash for all outstanding shares of First Bancshares. As of June 30, 2023, the Company recognized goodwill of $ 152.1 million which does not include all the subsequent fair value adjustments that have not yet been finalized. Goodwill represents the excess of the total purchase price paid over the fair value of the assets acquired, net of the fair value of liabilities assumed. Additionally, as of June 30, 2023, total core deposit intangibles related to First Bancshares were $ 25.3 million. During the second quarter of 2023, the Company completed the operational conversion of FirstCapital Bank. Pending Merger of Lone Star State Bancshares, Inc. — 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 five banking offices in the West Texas area, including its main office in Lubbock, and one banking center in each of Brownfield, Midland, Odessa and Big Spring, Texas. As of June 30, 2023, Lone Star, on a consolidated basis, reported total assets of $ 1.28 billion, total loans of $ 1.07 billion and total deposits of $ 1.12 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. The shareholders of Lone Star approved the transaction on March 28, 2023. The transaction is expected to close during the third quarter of 2023, although delays could occur.

New Accounting Standards (Polic

New Accounting Standards (Policies)	6 Months Ended
	Jun. 30, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Standards Updates (''ASU'')	Accounting Standards Updates (“ASU”) ASU 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. The amendments in ASU 2022-02 eliminated the accounting guidance for troubled debt restructurings and enhanced disclosures for certain loan refinancing and restructurings to borrowers experiencing financial difficulty. This guidance was applied on a prospective basis. Additionally, ASU 2022-02 requires entities to disclose current-period gross charge-offs by year of origination. ASU 2022-02 became effective for the Company on January 1, 2023 and did not 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 June 30, 2023, LIBOR was used as an index rate for approximately 83.7 % of the Company’s interest-rate swaps and approximately 0.17 % of the Company’s loan portfolio . As of December 31, 2022, LIBOR was used as an index rate for approximately 88.2 % of the Company’s interest-rate swaps and approximately 1.5 % of the Company’s loan portfolio. The adoption of ASU 2020-04 did not have a significant impact on the Company’s financial statements.

Income Per Common Share (Tables

Income Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table illustrates the computation of basic and diluted earnings per share: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Amount Per Share Amount Amount Per Share Amount Amount Per Share Amount Amount Per Share Amount (Amounts in thousands, except per share data) Net income $ 86,938 $ 128,490 $ 211,632 $ 250,816 Basic: Weighted average shares outstanding 92,930 $ 0.94 91,772 $ 1.40 92,073 $ 2.30 91,965 $ 2.73 Diluted: Weighted average shares outstanding 92,930 $ 0.94 91,772 $ 1.40 92,073 $ 2.30 91,965 $ 2.73

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2023
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: June 30, 2023 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available for Sale Corporate debt securities $ 20,698 $ 1,599 $ ( 446 ) $ 21,851 Collateralized mortgage obligations 345,155 1,066 ( 3,406 ) 342,815 Mortgage-backed securities 99,553 76 ( 2,282 ) 97,347 Total $ 465,406 $ 2,741 $ ( 6,134 ) $ 462,013 Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,511 $ — $ ( 125 ) $ 7,386 States and political subdivisions 121,634 938 ( 3,983 ) 118,589 Corporate debt securities 12,000 — ( 5,160 ) 6,840 Collateralized mortgage obligations 281,273 230 ( 23,370 ) 258,133 Mortgage-backed securities 12,782,888 967 ( 1,527,723 ) 11,256,132 Total $ 13,205,306 $ 2,135 $ ( 1,560,361 ) $ 11,647,080 December 31, 2022 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses 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
Securities in Continuous Loss Position	Securities with unrealized losses, segregated by length of time, that have been in a continuous loss position were as follows: June 30, 2023 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (Dollars in thousands) Available for Sale Corporate debt securities $ 5,154 $ ( 446 ) $ — $ — $ 5,154 $ ( 446 ) Collateralized mortgage obligations 53,814 ( 1,108 ) 118,225 ( 2,298 ) 172,039 ( 3,406 ) Mortgage-backed securities 93,054 ( 2,241 ) 1,112 ( 41 ) 94,166 ( 2,282 ) Total $ 152,022 $ ( 3,795 ) $ 119,337 $ ( 2,339 ) $ 271,359 $ ( 6,134 ) Held to Maturity U.S. Treasury securities and obligations of U.S. Government agencies $ 7,386 $ ( 125 ) $ — $ — $ 7,386 $ ( 125 ) States and political subdivisions 58,039 ( 815 ) 39,709 ( 3,168 ) 97,748 ( 3,983 ) Corporate debt securities 6,840 ( 5,160 ) — — 6,840 ( 5,160 ) Collateralized mortgage obligations 58,857 ( 1,863 ) 169,868 ( 21,507 ) 228,725 ( 23,370 ) Mortgage-backed securities 479,880 ( 16,452 ) 10,641,057 ( 1,511,271 ) 11,120,937 ( 1,527,723 ) Total $ 611,002 $ ( 24,415 ) $ 10,850,634 $ ( 1,535,946 ) $ 11,461,636 $ ( 1,560,361 ) December 31, 2022 Less than 12 Months 12 Months or More Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses (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 )
Investment Securities by Contractual Maturity	The table below summarizes the amortized cost and fair value of investment securities at June 30, 2023, 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 $ 15,320 $ 15,181 $ — $ — Due after one year through five years 64,855 64,782 2,550 2,843 Due after five years through ten years 48,892 42,095 18,148 19,008 Due after ten years 12,078 10,757 — — Subtotal 141,145 132,815 20,698 21,851 Mortgage-backed securities and collateralized mortgage obligations 13,064,161 11,514,265 444,708 440,162 Total $ 13,205,306 $ 11,647,080 $ 465,406 $ 462,013

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2023
Receivables [Abstract]
Types of Loans in Loan Portfolio	The loan portfolio consists of various types of loans and is categorized by major type as follows: June 30, 2023 December 31, 2022 (Dollars in thousands) Residential mortgage loans held for sale $ 10,656 $ 554 Commercial and industrial 2,746,055 2,594,742 Real estate: Construction, land development and other land loans 3,215,016 2,805,438 1-4 family residential (includes home equity) 7,747,227 6,740,670 Commercial real estate (includes multi-family residential) 5,676,526 4,986,211 Farmland 584,962 518,095 Agriculture 219,414 169,938 Consumer and other 305,207 283,559 Total loans held for investment, excluding Warehouse Purchase Program 20,494,407 18,098,653 Warehouse Purchase Program 1,148,883 740,620 Total loans, including Warehouse Purchase Program $ 21,653,946 $ 18,839,827
Related Party Loans	An analysis of activity with respect to these related party loans is as follows: As of and for the As of and for the 31, 2022 (Dollars in thousands) Beginning balance on January 1 $ 547 $ 6,524 New loans 3 54 Repayments ( 15 ) ( 6,031 ) Ending balance $ 535 $ 547
Aging Analysis of Past Due Loans	An aging analysis of past due loans, segregated by category of loan, is presented below: June 30, 2023 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans Total Loans (Dollars in thousands) Construction, land development and other land loans $ 12,911 $ — $ 12,911 $ 1,860 $ 3,200,245 $ 3,215,016 Warehouse Purchase Program loans — — — — 1,148,883 1,148,883 Agriculture and agriculture real estate (includes farmland) 6,276 86 6,362 1,199 796,815 804,376 1-4 family (includes home equity) (1) 24,476 — 24,476 19,125 7,714,282 7,757,883 Commercial real estate (includes multi-family residential) 6,006 — 6,006 13,266 5,657,254 5,676,526 Commercial and industrial 8,959 1,658 10,617 22,229 2,713,209 2,746,055 Consumer and other 294 — 294 44 304,869 305,207 Total $ 58,922 $ 1,744 $ 60,666 $ 57,723 $ 21,535,557 $ 21,653,946 December 31, 2022 Loans Past Due and Still Accruing 30-89 Days 90 or More Days Total Past Due Loans Nonaccrual Loans Current Loans 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 (1) Includes $ 10.7 million and $ 554 thousand of residential mortgage loans held for sale at June 30, 2023 and December 31, 2022 , respectively.
Non-performing Assets	The following table presents information regarding nonperforming assets as of the dates indicated: June 30, 2023 December 31, 2022 (Dollars in thousands) Nonaccrual loans (1) (3) $ 57,723 $ 19,614 (2) Accruing loans 90 or more days past due 1,744 5,917 Total nonperforming loans 59,467 25,531 Repossessed assets 153 — Other real estate 3,107 1,963 Total nonperforming assets $ 62,727 $ 27,494 Nonperforming assets to total loans and other real estate 0.29 % 0.15 % Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate 0.31 % 0.15 % Nonaccrual loans to total loans 0.27 % 0.10 % Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans 0.28 % 0.11 % (1) ASU 2022-02 became effective for the Company on January 1, 2023. (2) Includes troubled debt restructurings of $ 4.6 million as of December 31, 2022 . (3) There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.
Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans	The recorded investment in PCD loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of June 30, 2023 and December 31, 2022. June 30, 2023 December 31, 2022 (Dollars in thousands) PCD loans: Outstanding balance $ 661,349 $ 63,383 Discount ( 10,110 ) ( 3,361 ) Recorded investment $ 651,239 $ 60,022 The recorded investment in Non-PCD loans included in the consolidated balance sheet and the related outstanding balance as of the dates indicated are presented in the table below. The outstanding balance represents the total amount owed as of June 30, 2023 and December 31, 2022. June 30, 2023 December 31, 2022 (Dollars in thousands) Non-PCD loans: Outstanding balance $ 2,128,501 $ 1,319,507 Discount ( 23,052 ) ( 2,233 ) Recorded investment $ 2,105,449 $ 1,317,274
Summary of Changes in Accretable Yields of Acquired Loans	Changes in the accretable yield for acquired PCD loans for the three and six months ended June 30, 2023 and 2022 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (Dollars in thousands) Balance at beginning of period $ 3,022 $ 4,317 $ 3,361 $ 4,838 Additions 8,336 — 8,336 — Adjustments ( 70 ) — ( 70 ) — Accretion ( 1,178 ) ( 324 ) ( 1,517 ) ( 845 ) Balance at June 30, $ 10,110 $ 3,993 $ 10,110 $ 3,993 Changes in the discount accretion for Non-PCD loans for the three and six months ended June 30, 2023 and 2022 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (Dollars in thousands) Balance at beginning of period $ 1,701 $ 3,469 $ 2,233 $ 8,143 Addition 22,593 — 22,593 — Accretion ( 1,242 ) 265 ( 1,774 ) ( 4,409 ) Balance at June 30, $ 23,052 $ 3,734 $ 23,052 $ 3,734
Risk Grade by Category of Loan and Year of Origination/Renewal	The following tables present loans by risk grade, by category of loan and year of origination/renewal at June 30, 2023. Term Loans Amortized Cost Basis by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Construction, Land Development and Other Land Loans Grade 1 $ 613 $ — $ — $ — $ — $ — $ — $ — $ 613 Grade 2 675 183 — — — 75 — — 933 Grade 3 235,834 1,202,677 618,940 241,563 23,496 178,408 170,350 — 2,671,268 Grade 4 9,564 91,646 84,853 34,908 6,293 12,364 5,514 — 245,142 Grade 5 — 1,119 4,399 — 18,720 637 998 — 25,873 Grade 6 — — 5,572 3,012 — 1,190 — — 9,774 Grade 7 — — — — — 1,588 272 — 1,860 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 43,047 144,306 35,528 7,173 3,581 7,516 18,402 — 259,553 Total $ 289,733 $ 1,439,931 $ 749,292 $ 286,656 $ 52,090 $ 201,778 $ 195,536 $ — $ 3,215,016 Current-period gross write-offs $ — $ 77 $ — $ — $ — $ — $ — $ — $ 77 Agriculture and Agriculture Real Estate (includes Farmland) Grade 1 $ 854 $ 1,372 $ 289 $ 363 $ 40 $ 595 $ 9,109 $ 9 $ 12,631 Grade 2 — 75 106 — — 1,094 52 — 1,327 Grade 3 101,112 217,319 89,827 49,421 39,434 108,656 86,124 547 692,440 Grade 4 8,652 11,841 19,339 4,343 587 9,407 16,788 670 71,627 Grade 5 213 800 291 — 441 1,522 — — 3,267 Grade 6 — — 119 — — 478 — — 597 Grade 7 — — 1,014 — 17 168 — — 1,199 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 207 2,358 1,795 3,851 1,213 3,746 8,118 — 21,288 Total $ 111,038 $ 233,765 $ 112,780 $ 57,978 $ 41,732 $ 125,666 $ 120,191 $ 1,226 $ 804,376 Current-period gross write-offs $ — $ — $ — $ 113 $ — $ — $ — $ — $ 113 1-4 Family (includes Home Equity) (1) Grade 1 $ 77 $ 161 $ — $ 111 $ — $ — $ — $ — $ 349 Grade 2 1,969 1,430 160 256 33 3,432 110 — 7,390 Grade 3 833,650 1,904,045 2,147,286 1,091,293 452,578 1,060,720 103,023 1,997 7,594,592 Grade 4 4,917 19,150 25,097 6,081 8,484 52,762 3,003 — 119,494 Grade 5 — 62 — 123 4,443 4,939 — — 9,567 Grade 6 — — — 15 142 1,821 — — 1,978 Grade 7 — 2,538 3,966 2,521 1,666 8,434 — — 19,125 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 159 1,389 520 439 644 2,237 — — 5,388 Total $ 840,772 $ 1,928,775 $ 2,177,029 $ 1,100,839 $ 467,990 $ 1,134,345 $ 106,136 $ 1,997 $ 7,757,883 Current-period gross write-offs $ — $ — $ 50 $ 26 $ — $ 25 $ — $ — $ 101 Term Loans Amortized Cost Basis by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Commercial Real Estate (includes Multi-Family Residential) Grade 1 $ — $ — $ — $ — $ — $ — $ 72 $ — $ 72 Grade 2 — 6,281 — 494 — 2,570 — — 9,345 Grade 3 286,506 913,630 689,196 504,351 323,489 1,210,720 87,435 159 4,015,486 Grade 4 16,871 106,653 153,488 182,227 105,228 647,105 17,722 — 1,229,294 Grade 5 — — 366 — 15,009 59,345 818 — 75,538 Grade 6 — — 386 12,069 17,644 89,426 — — 119,525 Grade 7 — — — — 3,653 9,613 — — 13,266 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 11,270 43,268 35,119 8,250 7,885 107,679 529 — 214,000 Total $ 314,647 $ 1,069,832 $ 878,555 $ 707,391 $ 472,908 $ 2,126,458 $ 106,576 $ 159 $ 5,676,526 Current-period gross write-offs $ — $ 14,975 $ — $ — $ — $ — $ — $ — $ 14,975 Commercial and Industrial Grade 1 $ 8,184 $ 12,760 $ 9,897 $ 4,340 $ 1,934 $ 6,301 $ 33,881 $ 25 $ 77,322 Grade 2 676 9,264 327 228 — 3,954 2,767 — 17,216 Grade 3 142,559 301,751 188,560 77,413 76,000 166,299 1,056,888 1,632 2,011,102 Grade 4 94,245 21,721 7,764 10,075 10,549 115,265 149,350 213 409,182 Grade 5 — 22,546 11,078 1,277 439 1,052 8,434 — 44,826 Grade 6 44 425 300 1,006 1,463 1,041 8,985 34 13,298 Grade 7 — 15,602 72 1,311 171 1,202 3,853 18 22,229 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 8,619 29,465 13,230 5,188 5,813 1,660 86,905 — 150,880 Total $ 254,327 $ 413,534 $ 231,228 $ 100,838 $ 96,369 $ 296,774 $ 1,351,063 $ 1,922 $ 2,746,055 Current-period gross write-offs $ — $ 629 $ 20 $ 24 $ — $ 15 $ 554 $ — $ 1,242 Consumer and Other Grade 1 $ 7,023 $ 8,146 $ 4,156 $ 3,019 $ 1,433 $ 6,911 $ 1,777 $ — $ 32,465 Grade 2 94 14,212 — 422 — 2,420 5,007 — 22,155 Grade 3 56,455 47,120 30,581 28,933 13,473 13,799 51,660 — 242,021 Grade 4 67 39 1,233 1,144 1,348 632 3,924 — 8,387 Grade 5 — — — — — — 5 — 5 Grade 6 — — — — — — — — — Grade 7 — — — 40 4 — — — 44 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — 19 45 11 29 — 26 — 130 Total $ 63,639 $ 69,536 $ 36,015 $ 33,569 $ 16,287 $ 23,762 $ 62,399 $ — $ 305,207 Current-period gross write-offs $ 2,414 $ 33 $ 4 $ — $ 5 $ 20 $ 40 $ — $ 2,516 Term Loans Amortized Cost Basis by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans Total (Dollars in thousands) Warehouse Purchase Program Grade 1 $ — $ — $ — $ — $ — $ — $ — $ — $ — Grade 2 — — — — — — — — — Grade 3 1,148,883 — — — — — — — 1,148,883 Grade 4 — — — — — — — — — Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans — — — — — — — — — Total $ 1,148,883 $ — $ — $ — $ — $ — $ — $ — $ 1,148,883 Current-period gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Total Grade 1 $ 16,751 $ 22,439 $ 14,342 $ 7,833 $ 3,407 $ 13,807 $ 44,839 $ 34 $ 123,452 Grade 2 3,414 31,445 593 1,400 33 13,545 7,936 — 58,366 Grade 3 2,804,999 4,586,542 3,764,390 1,992,974 928,470 2,738,602 1,555,480 4,335 18,375,792 Grade 4 134,316 251,050 291,774 238,778 132,489 837,535 196,301 883 2,083,126 Grade 5 213 24,527 16,134 1,400 39,052 67,495 10,255 — 159,076 Grade 6 44 425 6,377 16,102 19,249 93,956 8,985 34 145,172 Grade 7 — 18,140 5,052 3,872 5,511 21,005 4,125 18 57,723 Grade 8 — — — — — — — — — Grade 9 — — — — — — — — — PCD Loans 63,302 220,805 86,237 24,912 19,165 122,838 113,980 — 651,239 Total $ 3,023,039 $ 5,155,373 $ 4,184,899 $ 2,287,271 $ 1,147,376 $ 3,908,783 $ 1,941,901 $ 5,304 $ 21,653,946 Current-period gross write-offs $ 2,414 $ 15,714 $ 74 $ 163 $ 5 $ 60 $ 594 $ — $ 19,024 (1) Includes $ 10.7 million of residential mortgage loans held for sale at June 30, 2023 .
Allowance for Credit Losses on Loans by Category of Loan	The following table details activity in the allowance for credit losses on loans by category of loan for the three and six months ended June 30, 2023 and 2022. 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: Three Months Ended Balance March 31, 2023 $ 80,561 $ 8,061 $ 62,538 $ 67,972 $ 57,296 $ 5,763 $ 282,191 Initial allowance on loans purchased with credit deterioration 15,237 2,914 1,590 21,002 26,332 24 67,099 Provision for credit losses on loans ( 3,890 ) 201 3,524 12,748 ( 1,498 ) 899 11,984 Charge-offs ( 77 ) ( 113 ) ( 36 ) ( 14,975 ) ( 341 ) ( 1,291 ) ( 16,833 ) Recoveries 27 191 106 18 181 245 768 Net (charge-offs) recoveries ( 50 ) 78 70 ( 14,957 ) ( 160 ) ( 1,046 ) ( 16,065 ) Balance June 30, 2023 $ 91,858 $ 11,254 $ 67,722 $ 86,765 $ 81,970 $ 5,640 $ 345,209 Six Months Ended Balance December 31, 2022 $ 78,853 $ 7,699 $ 60,795 $ 66,272 $ 62,319 $ 5,638 $ 281,576 Initial allowance on loans purchased with credit deterioration 15,237 2,914 1,590 21,002 26,332 24 67,099 Provision for credit losses ( 2,195 ) 557 5,127 14,447 ( 7,993 ) 2,041 11,984 Charge-offs ( 77 ) ( 113 ) ( 101 ) ( 14,975 ) ( 1,242 ) ( 2,516 ) ( 19,024 ) Recoveries 40 197 311 19 2,554 453 3,574 Net charge-offs ( 37 ) 84 210 ( 14,956 ) 1,312 ( 2,063 ) ( 15,450 ) Balance June 30, 2023 $ 91,858 $ 11,254 $ 67,722 $ 86,765 $ 81,970 $ 5,640 $ 345,209 Allowance for credit losses on loans: Three Months Ended Balance March 31, 2022 $ 61,007 $ 7,903 $ 59,368 $ 74,103 $ 76,303 $ 6,479 $ 285,163 Provision for credit losses 2,717 426 696 ( 3,697 ) ( 806 ) 664 — Charge-offs — — — — ( 192 ) ( 1,268 ) ( 1,460 ) Recoveries 5 9 32 ( 395 ) 389 216 256 Net charge-offs 5 9 32 ( 395 ) 197 ( 1,052 ) ( 1,204 ) Balance June 30, 2022 $ 63,729 $ 8,338 $ 60,096 $ 70,011 $ 75,694 $ 6,091 $ 283,959 Six Months Ended Balance December 31, 2021 $ 58,897 $ 7,759 $ 56,710 $ 75,005 $ 80,412 $ 7,597 $ 286,380 Provision for credit losses 5,257 467 3,441 ( 4,965 ) ( 4,901 ) 701 — Charge-offs ( 435 ) ( 155 ) ( 100 ) ( 39 ) ( 663 ) ( 2,675 ) ( 4,067 ) Recoveries 10 267 45 10 846 468 1,646 Net charge-offs ( 425 ) 112 ( 55 ) ( 29 ) 183 ( 2,207 ) ( 2,421 ) Balance June 30, 2022 $ 63,729 $ 8,338 $ 60,096 $ 70,011 $ 75,694 $ 6,091 $ 283,959
Rollforward of Allowance for Credit Losses on Off-Balance Sheet Credit Exposures	The following table represents a rollforward of the allowance for credit losses on off-balance sheet credit exposures for the periods shown. Three Months Ended June 30 Six Months Ended June 30 2023 2022 2023 2022 (Dollars in thousands) Balance at beginning of period $ 29,947 $ 29,947 $ 29,947 $ 29,947 Provision for credit losses on off-balance sheet credit exposures 6,556 — 6,556 — Balance at end of period $ 36,503 $ 29,947 $ 36,503 $ 29,947
Schedule of Amortized Cost of Loans Experiencing Financial Difficulty and Modified	The following table displays the amortized cost of loans that were both experiencing financial difficulty and modified during the three and six months ended June 30, 2023, presented by category of loan and type of modification. Payment Delay Term Extension Interest Rate Reduction Total Percentage of Total Loans Held for Investment (Dollars in thousands) Three Months Ended June 30, 2023 Commercial and industrial $ — $ 304 $ 304 0.00 % Construction, land development and other land loans — 1,175 — 1,175 0.01 % Commercial real estate (includes multi-family residential) 1,294 1,294 0.01 % Total $ 1,294 $ 1,175 $ 304 $ 2,773 0.02 % Six Months Ended June 30, 2023 Commercial and industrial $ — $ — $ 304 $ 304 0.00 % Construction, land development and other land loans — 5,408 — 5,408 0.03 % Commercial real estate (includes multi-family residential) 1,294 — — 1,294 0.01 % Total $ 1,294 $ 5,408 $ 304 $ 7,006 0.04 %
Schedule of Financial Effects of Loan Modifications	The following tables describe the financial effect of the modifications made to loans whose borrowers are experiencing financial difficulty: Payment Delay Loan Type Three Months Ended June 30, 2023 Six Months Ended June 30, 2023 Commercial real estate (includes multi-family residential) Short-term principal deferral Short-term principal deferral Term Extension Loan Type Three Months Ended June 30, 2023 Six Months Ended June 30, 2023 Construction, land development and other land loans Short-term extension Short-term extension Interest Rate Reduction Loan Type Three Months Ended June 30, 2023 Six Months Ended June 30, 2023 Commercial and industrial Reduced contractual interest rate Reduced contractual interest rate

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Assets and Liabilities Measured on Recurring Basis	The following tables present fair values for assets and liabilities measured at fair value on a recurring basis: As of June 30, 2023 Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets: Available for sale securities: Corporate debt securities $ — $ 21,851 $ — $ 21,851 Collateralized mortgage obligations — 342,815 — 342,815 Mortgage-backed securities — 97,347 — 97,347 Total $ — $ 462,013 $ — $ 462,013 Derivative financial instruments: Interest rate lock commitments $ — $ 203 $ — $ 203 Forward mortgage-backed securities trades — 122 — 122 Loan customer counterparty — — — — Financial institution counterparty — 5,318 — 5,318 Liabilities: Derivative financial instruments: Interest rate lock commitments $ — $ 1 $ — $ 1 Forward mortgage-backed securities trades — 10 — 10 Loan customer counterparty — 5,318 — 5,318 Financial institution counterparty — — — — As of 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 — — — —
Summary of Carrying and Fair Value Information of Financial Instruments	The following tables present carrying and fair value information of financial instruments as of the dates indicated: As of June 30, 2023 Carrying Estimated Fair Value Amount Level 1 Level 2 Level 3 Total (Dollars in thousands) Assets Cash and due from banks $ 396,848 $ 396,848 $ — $ — $ 396,848 Federal funds sold 181 181 — — 181 Held to maturity securities 13,205,306 — 11,647,080 — 11,647,080 Loans held for sale 10,656 — 10,656 — 10,656 Loans held for investment, net of allowance 20,149,198 — — 19,488,281 19,488,281 Loans held for investment - Warehouse Purchase Program 1,148,883 — 1,148,883 — 1,148,883 Other real estate owned 3,107 — 3,107 — 3,107 Liabilities Deposits: Noninterest-bearing $ 10,364,921 $ — $ 10,364,921 $ — $ 10,364,921 Interest-bearing 17,015,965 — 16,963,645 — 16,963,645 Other borrowings 4,800,000 — 4,712,812 — 4,712,812 Securities sold under repurchase agreements 434,160 — 434,102 — 434,102 Subordianted debentures 3,093 — 3,088 — 3,088 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

Goodwill and Core Deposit Int_2

Goodwill and Core Deposit Intangibles (Tables)	6 Months Ended
	Jun. 30, 2023
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 the six months ended June 30, 2023 and the year ended December 31, 2022 were as follows: Goodwill Core Deposit Intangibles (Dollars in thousands) 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 Less: Amortization — ( 5,541 ) Add: First Bancshares Merger 152,062 25,321 Balance as of June 30, 2023 $ 3,383,698 $ 71,128
Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles	The estimated aggregate future amortization expense for core deposit intangibles remaining as of June 30, 2023 is as follows (dollars in thousands): Remaining 2023 $ 7,135 2024 12,813 2025 11,409 2026 10,376 2027 9,288 Thereafter 20,107 Total $ 71,128

Contractual Obligations and O_2

Contractual Obligations and Off-Balance Sheet Items (Tables)	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances	The Company’s future cash payments associated with its contractual obligations pursuant to its subordinated debentures, the Federal Reserve's Bank Term Funding Program (“BTFP”) and Federal Home Loan Bank (“FHLB”) advances as of June 30, 2023 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) Subordinated debentures $ 244 $ 487 $ 487 $ 4,512 $ 5,730 Bank Term Funding Program 3,141,614 — — — 3,141,614 Federal Home Loan Bank advances 1,800,000 — — — 1,800,000 $ 4,941,858 $ 487 $ 487 $ 4,512 $ 4,947,344
Future Undiscounted Cash Payments Associated with its Operating Leases	The Company’s future undiscounted cash payments associated with its operating leases as of June 30, 2023 are summarized below (dollars in thousands). Remaining 2023 $ 5,469 2024 10,229 2025 9,663 2026 8,536 2027 5,568 2028 2,588 Thereafter 5,283 Total undiscounted lease payments $ 47,336
Summary of Commitments Associated with Outstanding Standby Letters of Credit, Unused Capacity on Warehouse Purchase Program Loans 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 June 30, 2023 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 $ 70,552 $ 8,001 $ 2,578 $ 26 $ 81,157 Unused capacity on Warehouse Purchase Program loans 959,117 — — — 959,117 Commitments to extend credit 1,865,681 1,007,818 320,147 1,948,768 5,142,414 Total $ 2,895,350 $ 1,015,819 $ 322,725 $ 1,948,794 $ 6,182,688

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)	The tax effects allocated to each component of other comprehensive income (loss) were as follows: Three Months Ended June 30, 2023 2022 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive income (loss): Securities available for sale: Change in unrealized gain (loss) during period $ 1,006 $ ( 211 ) $ 795 $ ( 598 ) $ 125 $ ( 473 ) Total securities available for sale 1,006 ( 211 ) 795 ( 598 ) 125 ( 473 ) Total other comprehensive income (loss) $ 1,006 $ ( 211 ) $ 795 $ ( 598 ) $ 125 $ ( 473 ) Six Months Ended June 30, 2023 2022 Before Tax Amount Tax Effect Net of Tax Amount Before Tax Amount Tax Effect Net of Tax Amount (Dollars in thousands) Other comprehensive income (loss): Securities available for sale: Change in unrealized gain (loss) during period $ 1,002 $ ( 210 ) $ 792 $ ( 773 ) $ 162 $ ( 611 ) Total securities available for sale 1,002 ( 210 ) 792 ( 773 ) 162 ( 611 ) Total other comprehensive income (loss) $ 1,002 $ ( 210 ) $ 792 $ ( 773 ) $ 162 $ ( 611 )
Activity in Accumulated Other Comprehensive Income (Loss) Associated with Securities Available for Sale, Net of Tax	Activity in accumulated other comprehensive income (loss) associated with securities available for sale, net of tax, was as follows: Securities Available Accumulated Other Comprehensive Income (Loss) (Dollars in thousands) Balance at December 31, 2022 $ ( 3,473 ) $ ( 3,473 ) Other comprehensive income 792 792 Balance at June 30, 2023 $ ( 2,681 ) $ ( 2,681 ) Balance at December 31, 2021 $ 1,809 $ 1,809 Other comprehensive loss ( 611 ) ( 611 ) Balance at June 30, 2022 $ 1,198 $ 1,198

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2023
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 June 30, 2023 and December 31, 2022. June 30, 2023 December 31, 2022 Outstanding Asset Liability Derivative Outstanding Asset Liability Derivative (Dollars in thousands) Interest rate lock commitments $ 16,447 $ 203 $ 1 $ 4,599 $ 94 $ 6 Forward mortgage-backed securities trades 27,250 122 10 5,250 31 — Commercial loan interest rate swaps and caps: Loan customer counterparty 67,657 — 5,318 93,214 — 5,522 Financial institution counterparty 67,657 5,318 — 93,214 5,522 —
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 June 30, 2023 and December 31, 2022 are presented in the following table. Weighted-Average Interest Rate June 30, 2023 December 31, 2022 Received Paid Received Paid Loan customer counterparty 3.08 % 6.59 % 3.05 % 5.18 %
Schedule of Income (Loss) from Derivatives Not Designated as Hedging Instruments	Income (loss) for the three and six months ended June 30, 2023 and 2022 was as follows: Three Months Ended June 30, Six Months Ended June 30, Derivatives not designated as hedging instruments 2023 2022 2023 2022 (Dollars in thousands) Interest rate lock commitments $ 84 $ 173 $ 114 $ ( 5 ) Forward mortgage-backed securities trades 208 163 158 479

Income Per Common Share - Sched

Income Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 86,938	$ 128,490	$ 211,632	$ 250,816
Basic, Weighted average shares outstanding (in shares)	92,930	91,772	92,073	91,965
Basic	$ 0.94	$ 1.40	$ 2.30	$ 2.73
Diluted, Weighted average shares outstanding (in shares)	92,930	91,772	92,073	91,965
Diluted	$ 0.94	$ 1.40	$ 2.30	$ 2.73

Income Per Common Share - Addit

Income Per Common Share - Additional Information (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Number of options outstanding	0		0
Antidilutive Securities excluded from computation of earnings per share, amount	0	0	0	0

New Accounting Standards - Addi

New Accounting Standards - Additional Information (Details)	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
Interest rate swaps and loans portfolio description of index rate basis	LIBOR was used as an index rate for approximately 83.7% of the Company’s interest-rate swaps and approximately 0.17% of the Company’s loan portfolio
Percentage of interest rate swap which used LIBOR as an index rate	83.70%	88.20%
Percentage of loan portfolio which used LIBOR as an index rate	0.17%	1.50%

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	$ 465,406	$ 460,898
Available for Sale, Gross Unrealized Gains	2,741	1,283
Available for Sale, Gross Unrealized Losses	(6,134)	(5,679)
Available for Sale	462,013	456,502
Held to Maturity, Amortized Cost	13,205,306	14,019,503
Held to Maturity, Gross Unrealized Gains	2,135	3,820
Held to Maturity, Gross Unrealized Losses	(1,560,361)	(1,636,198)
Held to Maturity	11,647,080	12,387,125
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	20,698
Available for Sale, Gross Unrealized Gains	1,599
Available for Sale, Gross Unrealized Losses	(446)
Available for Sale	21,851
Held to Maturity, Amortized Cost	12,000	12,000
Held to Maturity, Gross Unrealized Losses	(5,160)	(2,520)
Held to Maturity	6,840	9,480
Collateralized Mortgage Obligations [Member]
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	345,155	359,251
Available for Sale, Gross Unrealized Gains	1,066	1,190
Available for Sale, Gross Unrealized Losses	(3,406)	(3,039)
Available for Sale	342,815	357,402
Held to Maturity, Amortized Cost	281,273	271,727
Held to Maturity, Gross Unrealized Gains	230	377
Held to Maturity, Gross Unrealized Losses	(23,370)	(22,922)
Held to Maturity	258,133	249,182
Mortgage-backed Securities [Member]
Marketable Securities [Line Items]
Available for Sale, Amortized Cost	99,553	101,647
Available for Sale, Gross Unrealized Gains	76	93
Available for Sale, Gross Unrealized Losses	(2,282)	(2,640)
Available for Sale	97,347	99,100
Held to Maturity, Amortized Cost	12,782,888	13,613,415
Held to Maturity, Gross Unrealized Gains	967	2,575
Held to Maturity, Gross Unrealized Losses	(1,527,723)	(1,607,501)
Held to Maturity	11,256,132	12,008,489
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Marketable Securities [Line Items]
Held to Maturity, Amortized Cost	7,511
Held to Maturity, Gross Unrealized Losses	(125)
Held to Maturity	7,386
States and Political Subdivisions [Member]
Marketable Securities [Line Items]
Held to Maturity, Amortized Cost	121,634	122,361
Held to Maturity, Gross Unrealized Gains	938	868
Held to Maturity, Gross Unrealized Losses	(3,983)	(3,255)
Held to Maturity	$ 118,589	$ 119,974

Securities - Additional Informa

Securities - Additional Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) Security	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Security Segment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) Security
Schedule Of Held To Maturity Securities [Line Items]
Number of Investment Securities Segments | Segment			2
Credit losses			$ 0
Municipal securities percentage of securities portfolio	0.90%		0.90%
Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions Greater Than or Equal to One Year | Security	850		850		174
Gain (loss) on sale of securities	$ 0	$ 0	$ 0	$ 0
Available for Sale Securities, Amortized Cost Basis	465,406,000		465,406,000		$ 460,898,000
Debt Securities, Available-for-Sale	462,013,000		462,013,000		456,502,000
Collateralized Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Available for Sale Securities, Amortized Cost Basis	10,600,000,000		10,600,000,000		7,870,000,000
Debt Securities, Available-for-Sale	$ 9,330,000,000		$ 9,330,000,000		$ 6,900,000,000
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	Jun. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	$ 152,022	$ 156,771
Available for Sale, Unrealized Losses, Less than 12 Months	(3,795)	(5,639)
Available for Sale, Estimated Fair Value, 12 Months or More	119,337	99,470
Available for Sale, Unrealized Losses, 12 Months or More	(2,339)	(40)
Available for Sale, Estimated Fair Value, Total	271,359	256,241
Available for Sale, Unrealized Losses, Total	(6,134)	(5,679)
Held to Maturity, Estimated Fair Value, Less than 12 Months	611,002	5,550,115
Held to Maturity, Unrealized Losses, Less than 12 Months	(24,415)	(442,015)
Held to Maturity, Estimated Fair Value, 12 Months or More	10,850,634	6,606,126
Held to Maturity, Unrealized Losses, 12 Months or More	(1,535,946)	(1,194,183)
Held to Maturity, Estimated Fair Value, Total	11,461,636	12,156,241
Held to Maturity, Unrealized Losses, Total	(1,560,361)	(1,636,198)
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	5,154
Available for Sale, Unrealized Losses, Less than 12 Months	(446)
Available for Sale, Estimated Fair Value, Total	5,154
Available for Sale, Unrealized Losses, Total	(446)
Held to Maturity, Estimated Fair Value, Less than 12 Months	6,840	9,480
Held to Maturity, Unrealized Losses, Less than 12 Months	(5,160)	(2,520)
Held to Maturity, Estimated Fair Value, Total	6,840	9,480
Held to Maturity, Unrealized Losses, Total	(5,160)	(2,520)
Collateralized Mortgage Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	53,814	61,559
Available for Sale, Unrealized Losses, Less than 12 Months	(1,108)	(3,012)
Available for Sale, Estimated Fair Value, 12 Months or More	118,225	99,179
Available for Sale, Unrealized Losses, 12 Months or More	(2,298)	(27)
Available for Sale, Estimated Fair Value, Total	172,039	160,738
Available for Sale, Unrealized Losses, Total	(3,406)	(3,039)
Held to Maturity, Estimated Fair Value, Less than 12 Months	58,857	214,538
Held to Maturity, Unrealized Losses, Less than 12 Months	(1,863)	(22,557)
Held to Maturity, Estimated Fair Value, 12 Months or More	169,868	4,358
Held to Maturity, Unrealized Losses, 12 Months or More	(21,507)	(365)
Held to Maturity, Estimated Fair Value, Total	228,725	218,896
Held to Maturity, Unrealized Losses, Total	(23,370)	(22,922)
Mortgage-backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for Sale, Estimated Fair Value, Less than 12 Months	93,054	95,212
Available for Sale, Unrealized Losses, Less than 12 Months	(2,241)	(2,627)
Available for Sale, Estimated Fair Value, 12 Months or More	1,112	291
Available for Sale, Unrealized Losses, 12 Months or More	(41)	(13)
Available for Sale, Estimated Fair Value, Total	94,166	95,503
Available for Sale, Unrealized Losses, Total	(2,282)	(2,640)
Held to Maturity, Estimated Fair Value, Less than 12 Months	479,880	5,276,315
Held to Maturity, Unrealized Losses, Less than 12 Months	(16,452)	(416,053)
Held to Maturity, Estimated Fair Value, 12 Months or More	10,641,057	6,585,470
Held to Maturity, Unrealized Losses, 12 Months or More	(1,511,271)	(1,191,448)
Held to Maturity, Estimated Fair Value, Total	11,120,937	11,861,785
Held to Maturity, Unrealized Losses, Total	(1,527,723)	(1,607,501)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Estimated Fair Value, Less than 12 Months	7,386
Held to Maturity, Unrealized Losses, Less than 12 Months	(125)
Held to Maturity, Estimated Fair Value, Total	7,386
Held to Maturity, Unrealized Losses, Total	(125)
States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Held to Maturity, Estimated Fair Value, Less than 12 Months	58,039	49,782
Held to Maturity, Unrealized Losses, Less than 12 Months	(815)	(885)
Held to Maturity, Estimated Fair Value, 12 Months or More	39,709	16,298
Held to Maturity, Unrealized Losses, 12 Months or More	(3,168)	(2,370)
Held to Maturity, Estimated Fair Value, Total	97,748	66,080
Held to Maturity, Unrealized Losses, Total	$ (3,983)	$ (3,255)

Securities - Investment Securit

Securities - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, amortized cost, due in one year or less	$ 15,320
Held to Maturity, amortized cost, due after one year through five years	64,855
Held to Maturity, amortized cost, due after five years through ten years	48,892
Held to Maturity, amortized cost, due after ten years	12,078
Held to Maturity, amortized cost, subtotal	141,145
Held to Maturity, amortized cost, mortgage-backed securities and collateralized mortgage obligations	13,064,161
Held to Maturity, Amortized Cost	13,205,306	$ 14,019,503
Held to Maturity, fair value, due in one year or less	15,181
Held to Maturity, fair value, due after one year through five years	64,782
Held to Maturity, fair value, due after five years through ten years	42,095
Held to Maturity, fair value, due after ten years	10,757
Held to Maturity, fair value, subtotal	132,815
Held to Maturity, fair value, mortgage-backed securities and collateralized mortgage obligations	11,514,265
Held to Maturity, fair value, total	11,647,080	12,387,125
Available for Sale, amortized cost, due after one year through five years	2,550
Available for Sale, amortized cost, due after five years through ten years	18,148
Available for Sale, amortized cost, subtotal	20,698
Available for Sale, amortized cost, mortgage-backed securities and collateralized mortgage obligations	444,708
Available for Sale, Amortized Cost	465,406	460,898
Available for Sale, fair value, due after one year through five years	2,843
Available for Sale, fair value, due after five years through ten years	19,008
Available for Sale, fair value, subtotal	21,851
Available for Sale, fair value, mortgage-backed securities and collateralized mortgage obligations	440,162
Available for Sale securities, at fair value	$ 462,013	$ 456,502

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Types of Loans in Loan Portfolio (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		$ 10,656	$ 554
Loans held for investment		20,494,407	18,098,653
Total loans, including Warehouse Purchase Program		21,653,946	18,839,827
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		10,656	554
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans, including Warehouse Purchase Program		14,975
Warehouse Purchase Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		1,148,883	740,620
Total loans, including Warehouse Purchase Program		1,148,883	740,620
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		2,746,055	2,594,742
Total loans, including Warehouse Purchase Program		2,746,055	2,594,742
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		3,215,016	2,805,438
Total loans, including Warehouse Purchase Program		3,215,016	2,805,438
Real Estate [Member] | 1-4 Family [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		7,747,227	6,740,670
Total loans, including Warehouse Purchase Program	[1]	7,757,883	6,741,224
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		5,676,526	4,986,211
Total loans, including Warehouse Purchase Program		5,676,526	4,986,211
Real Estate [Member] | Farmland [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		584,962	518,095
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		219,414	169,938
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		305,207	283,559
Total loans, including Warehouse Purchase Program		$ 305,207	$ 283,559
[1] Includes $ 10.7 million and $ 554 thousand of residential mortgage loans held for sale at June 30, 2023 and December 31, 2022 , respectively.

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) Contract	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Percentage of Loans Related to Single Industry on Loans	10%		10%			10%
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans	81.10%		81.10%			80.30%
Loans and Leases Receivable, Related Parties	$ 535,000		$ 535,000			$ 547,000		$ 6,524,000
Loans held for investment	$ 20,494,407,000		$ 20,494,407,000			$ 18,098,653,000
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate	0.29%		0.29%			0.15%
Loans and leases receivable, nonaccrual loans	$ 57,700,000		$ 57,700,000			$ 19,600,000
Financing Receivable, Allowance for Credit Losses on Loans	$ 345,200,000		$ 345,200,000			$ 281,600,000
Allowance for Credit Losses as Percentage of Loans	1.59%		1.59%			1.49%
Provision for credit losses	$ 11,984,000	$ 0	$ 11,984,000	$ 0
Provision for credit losses	18,540,000		18,540,000
Increase in allowance for credit losses for loans			$ (63,600,000)
Decrease in allowance for credit losses for loans, percentage			22.60%
Net charge-offs	16,065,000	1,204,000	$ 15,450,000	2,421,000
Allowance for credit losses on off-balance sheet credit exposures	36,503,000	29,947,000	36,503,000	$ 29,947,000	$ 29,947,000	$ 29,947,000	$ 29,947,000	$ 29,947,000
Commitments expected to fund	2,570,000,000		2,570,000,000
Nonaccrual loans	57,723,000		57,723,000			19,614,000
Financing receivable, modifications, number of contract | Contract				0
Restructured loans charge-off				$ 0
First Bancshares of Texas, Inc. [Member]
Accounts Notes And Loans Receivable [Line Items]
Provision for credit losses	12,000,000
Troubled Debt Restructuring [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses on off-balance sheet credit exposures						29,900,000
Nonaccrual loans		$ 933,000		$ 933,000
Troubled Debt Restructuring [Member] | First Bancshares of Texas, Inc. [Member]
Accounts Notes And Loans Receivable [Line Items]
Provision for credit losses	6,500,000
PCD Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
General reserve	3,500,000		3,700,000
Nonperforming Financial Instruments [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	62,700,000		62,700,000			$ 27,500,000
Commercial Real Estate Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Net charge-offs	$ 15,000,000		$ 15,000,000

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Related Party Loans (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Beginning balance on January 1	$ 547	$ 6,524
New loans	3	54
Repayments	(15)	(6,031)
Ending balance	$ 535	$ 547

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 21,535,557	$ 18,762,560
Nonaccrual loans		57,723	19,614
Total loans		21,653,946	18,839,827
Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		58,922	51,736
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,744	5,917
Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		60,666	57,653
Warehouse Purchase Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,148,883	740,620
Total loans		1,148,883	740,620
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		796,815	685,861
Nonaccrual loans		1,199	421
Total loans		804,376	688,033
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		6,276	1,751
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		86
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		6,362	1,751
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans		14,975
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		3,200,245	2,790,702
Nonaccrual loans		1,860	318
Total loans		3,215,016	2,805,438
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		12,911	9,976
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [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		12,911	14,418
Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans		804,376
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]	7,714,282	6,700,575
Nonaccrual loans	[1]	19,125	14,762
Total loans	[1]	7,757,883	6,741,224
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]	24,476	25,880
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]		7
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]	24,476	25,887
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		5,657,254	4,981,386
Nonaccrual loans		13,266	1,649
Total loans		5,676,526	4,986,211
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		6,006	3,176
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		6,006	3,176
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,713,209	2,580,246
Nonaccrual loans		22,229	2,453
Total loans		2,746,055	2,594,742
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		8,959	10,575
Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,658	1,468
Commercial and Industrial [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		10,617	12,043
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		304,869	283,170
Nonaccrual loans		44	11
Total loans		305,207	283,559
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		294	378
Consumer and Other [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 294	$ 378
[1] Includes $ 10.7 million and $ 554 thousand of residential mortgage loans held for sale at June 30, 2023 and December 31, 2022 , respectively.

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Parenthetical) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 10,656	$ 554
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 10,656	$ 554

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Nonperforming Assets (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 20,494,407	$ 18,098,653
Other real estate owned		$ 3,107	$ 1,963
Nonperforming assets to total loans and other real estate		0.29%	0.15%
Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate		0.31%	0.15%
Nonaccrual loans to total loans		0.27%	0.10%
Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans		0.28%	0.11%
Nonperforming Financial Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 59,467	$ 25,531
Repossessed assets		153
Other real estate owned		3,107	1,963
Total nonperforming assets		62,727	27,494
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	[1],[2],[3]	57,723	19,614
Nonperforming Financial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 1,744	$ 5,917
[1] ASU 2022-02 became effective for the Company on January 1, 2023. Includes troubled debt restructurings of $ 4.6 million as of December 31, 2022 . There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Nonperforming Assets (Parenthetical) (Details) - USD ($)		Jun. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 20,494,407,000	$ 18,098,653,000
Nonperforming Financial Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		59,467,000	25,531,000
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	[1],[2],[3]	57,723,000	19,614,000
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
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	$ 0
[1] ASU 2022-02 became effective for the Company on January 1, 2023. Includes troubled debt restructurings of $ 4.6 million as of December 31, 2022 . There were no nonperforming 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 - Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	$ 661,349	$ 63,383
Discount	(10,110)	(3,361)
Recorded investment	651,239	60,022
Non-PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	2,128,501	1,319,507
Discount	(23,052)	(2,233)
Recorded investment	$ 2,105,449	$ 1,317,274

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Summary of Changes in Accretable Yields of Acquired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
PCD Loans [Member]
Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]
Balance at beginning of period	$ 3,022	$ 4,317	$ 3,361	$ 4,838
Addition	8,336		8,336
Adjustments	(70)		(70)
Accretion	(1,178)	(324)	(1,517)	(845)
Balance at June 30,	10,110	3,993	10,110	3,993
Non-PCD Loans [Member]
Changes In Accretable Yield for PCI And Non PCI Loans [Line Items]
Balance at beginning of period	1,701	3,469	2,233	8,143
Addition	22,593		22,593
Accretion	(1,242)	265	(1,774)	(4,409)
Balance at June 30,	$ 23,052	$ 3,734	$ 23,052	$ 3,734

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Risk Grade by Category of Loan and Year of Origination/Renewal (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Financing Receivable Impaired [Line Items]
2023		$ 3,023,039
2022		5,155,373
2021		4,184,899
2020		2,287,271
2019		1,147,376
Prior		3,908,783
Revolving Loans		1,941,901
Revolving Loans Converted to Term Loans		5,304
Total loans		21,653,946	$ 18,839,827
Current-period gross write-offs, 2023		2,414
Current-period gross write-offs, 2022		15,714
Current-period gross write-offs, 2021		74
Current-period gross write-offs, 2020		163
Current-period gross write-offs, 2019		5
Current-period gross write-offs, Prior		60
Current-period gross write-offs, Revolving Loans		594
Current-period gross write-offs, Total		19,024
PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		63,302
2022		220,805
2021		86,237
2020		24,912
2019		19,165
Prior		122,838
Revolving Loans		113,980
Total loans		651,239
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
Total loans		804,376	688,033
Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
Total loans		14,975
Current-period gross write-offs, 2022		14,975
Warehouse Purchase Program [Member]
Financing Receivable Impaired [Line Items]
2023		1,148,883
Total loans		1,148,883	740,620
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		289,733
2022		1,439,931
2021		749,292
2020		286,656
2019		52,090
Prior		201,778
Revolving Loans		195,536
Total loans		3,215,016	2,805,438
Current-period gross write-offs, 2022		77
Current-period gross write-offs, Total		77
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		43,047
2022		144,306
2021		35,528
2020		7,173
2019		3,581
Prior		7,516
Revolving Loans		18,402
Total loans		259,553
Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2023		111,038
2022		233,765
2021		112,780
2020		57,978
2019		41,732
Prior		125,666
Revolving Loans		120,191
Revolving Loans Converted to Term Loans		1,226
Total loans		804,376
Current-period gross write-offs, 2020		113
Current-period gross write-offs, Total		113
Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		207
2022		2,358
2021		1,795
2020		3,851
2019		1,213
Prior		3,746
Revolving Loans		8,118
Total loans		21,288
Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		840,772
2022		1,928,775
2021		2,177,029
2020		1,100,839
2019		467,990
Prior		1,134,345
Revolving Loans		106,136
Revolving Loans Converted to Term Loans		1,997
Total loans	[1]	7,757,883	6,741,224
Current-period gross write-offs, 2021		50
Current-period gross write-offs, 2020		26
Current-period gross write-offs, Prior		25
Current-period gross write-offs, Total		101
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		159
2022		1,389
2021		520
2020		439
2019		644
Prior		2,237
Total loans		5,388
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2023		314,647
2022		1,069,832
2021		878,555
2020		707,391
2019		472,908
Prior		2,126,458
Revolving Loans		106,576
Revolving Loans Converted to Term Loans		159
Total loans		5,676,526	4,986,211
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		11,270
2022		43,268
2021		35,119
2020		8,250
2019		7,885
Prior		107,679
Revolving Loans		529
Total loans		214,000
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		254,327
2022		413,534
2021		231,228
2020		100,838
2019		96,369
Prior		296,774
Revolving Loans		1,351,063
Revolving Loans Converted to Term Loans		1,922
Total loans		2,746,055	2,594,742
Current-period gross write-offs, 2022		629
Current-period gross write-offs, 2021		20
Current-period gross write-offs, 2020		24
Current-period gross write-offs, Prior		15
Current-period gross write-offs, Revolving Loans		554
Current-period gross write-offs, Total		1,242
Commercial and Industrial [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2023		8,619
2022		29,465
2021		13,230
2020		5,188
2019		5,813
Prior		1,660
Revolving Loans		86,905
Total loans		150,880
Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2023		63,639
2022		69,536
2021		36,015
2020		33,569
2019		16,287
Prior		23,762
Revolving Loans		62,399
Total loans		305,207	$ 283,559
Current-period gross write-offs, 2023		2,414
Current-period gross write-offs, 2022		33
Current-period gross write-offs, 2021		4
Current-period gross write-offs, 2019		5
Current-period gross write-offs, Prior		20
Current-period gross write-offs, Revolving Loans		40
Current-period gross write-offs, Total		2,516
Consumer and Other [Member] | PCD Loans [Member]
Financing Receivable Impaired [Line Items]
2022		19
2021		45
2020		11
2019		29
Revolving Loans		26
Total loans		130
Grade 1 [Member]
Financing Receivable Impaired [Line Items]
2023		16,751
2022		22,439
2021		14,342
2020		7,833
2019		3,407
Prior		13,807
Revolving Loans		44,839
Revolving Loans Converted to Term Loans		34
Total loans		123,452
Grade 1 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		613
Total loans		613
Grade 1 [Member] | Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2023		854
2022		1,372
2021		289
2020		363
2019		40
Prior		595
Revolving Loans		9,109
Revolving Loans Converted to Term Loans		9
Total loans		12,631
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		77
2022		161
2020		111
Total loans		349
Grade 1 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
Revolving Loans		72
Total loans		72
Grade 1 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		8,184
2022		12,760
2021		9,897
2020		4,340
2019		1,934
Prior		6,301
Revolving Loans		33,881
Revolving Loans Converted to Term Loans		25
Total loans		77,322
Grade 1 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2023		7,023
2022		8,146
2021		4,156
2020		3,019
2019		1,433
Prior		6,911
Revolving Loans		1,777
Total loans		32,465
Grade 2 [Member]
Financing Receivable Impaired [Line Items]
2023		3,414
2022		31,445
2021		593
2020		1,400
2019		33
Prior		13,545
Revolving Loans		7,936
Total loans		58,366
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		675
2022		183
Prior		75
Total loans		933
Grade 2 [Member] | Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2022		75
2021		106
Prior		1,094
Revolving Loans		52
Total loans		1,327
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		1,969
2022		1,430
2021		160
2020		256
2019		33
Prior		3,432
Revolving Loans		110
Total loans		7,390
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2022		6,281
2020		494
Prior		2,570
Total loans		9,345
Grade 2 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		676
2022		9,264
2021		327
2020		228
Prior		3,954
Revolving Loans		2,767
Total loans		17,216
Grade 2 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2023		94
2022		14,212
2020		422
Prior		2,420
Revolving Loans		5,007
Total loans		22,155
Grade 3 [Member]
Financing Receivable Impaired [Line Items]
2023		2,804,999
2022		4,586,542
2021		3,764,390
2020		1,992,974
2019		928,470
Prior		2,738,602
Revolving Loans		1,555,480
Revolving Loans Converted to Term Loans		4,335
Total loans		18,375,792
Grade 3 [Member] | Warehouse Purchase Program [Member]
Financing Receivable Impaired [Line Items]
2023		1,148,883
Total loans		1,148,883
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		235,834
2022		1,202,677
2021		618,940
2020		241,563
2019		23,496
Prior		178,408
Revolving Loans		170,350
Total loans		2,671,268
Grade 3 [Member] | Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2023		101,112
2022		217,319
2021		89,827
2020		49,421
2019		39,434
Prior		108,656
Revolving Loans		86,124
Revolving Loans Converted to Term Loans		547
Total loans		692,440
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		833,650
2022		1,904,045
2021		2,147,286
2020		1,091,293
2019		452,578
Prior		1,060,720
Revolving Loans		103,023
Revolving Loans Converted to Term Loans		1,997
Total loans		7,594,592
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2023		286,506
2022		913,630
2021		689,196
2020		504,351
2019		323,489
Prior		1,210,720
Revolving Loans		87,435
Revolving Loans Converted to Term Loans		159
Total loans		4,015,486
Grade 3 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		142,559
2022		301,751
2021		188,560
2020		77,413
2019		76,000
Prior		166,299
Revolving Loans		1,056,888
Revolving Loans Converted to Term Loans		1,632
Total loans		2,011,102
Grade 3 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2023		56,455
2022		47,120
2021		30,581
2020		28,933
2019		13,473
Prior		13,799
Revolving Loans		51,660
Total loans		242,021
Grade 4 [Member]
Financing Receivable Impaired [Line Items]
2023		134,316
2022		251,050
2021		291,774
2020		238,778
2019		132,489
Prior		837,535
Revolving Loans		196,301
Revolving Loans Converted to Term Loans		883
Total loans		2,083,126
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2023		9,564
2022		91,646
2021		84,853
2020		34,908
2019		6,293
Prior		12,364
Revolving Loans		5,514
Total loans		245,142
Grade 4 [Member] | Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2023		8,652
2022		11,841
2021		19,339
2020		4,343
2019		587
Prior		9,407
Revolving Loans		16,788
Revolving Loans Converted to Term Loans		670
Total loans		71,627
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2023		4,917
2022		19,150
2021		25,097
2020		6,081
2019		8,484
Prior		52,762
Revolving Loans		3,003
Total loans		119,494
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2023		16,871
2022		106,653
2021		153,488
2020		182,227
2019		105,228
Prior		647,105
Revolving Loans		17,722
Total loans		1,229,294
Grade 4 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		94,245
2022		21,721
2021		7,764
2020		10,075
2019		10,549
Prior		115,265
Revolving Loans		149,350
Revolving Loans Converted to Term Loans		213
Total loans		409,182
Grade 4 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2023		67
2022		39
2021		1,233
2020		1,144
2019		1,348
Prior		632
Revolving Loans		3,924
Total loans		8,387
Grade 5 [Member]
Financing Receivable Impaired [Line Items]
2023		213
2022		24,527
2021		16,134
2020		1,400
2019		39,052
Prior		67,495
Revolving Loans		10,255
Total loans		159,076
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2022		1,119
2021		4,399
2019		18,720
Prior		637
Revolving Loans		998
Total loans		25,873
Grade 5 [Member] | Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2023		213
2022		800
2021		291
2019		441
Prior		1,522
Total loans		3,267
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		62
2020		123
2019		4,443
Prior		4,939
Total loans		9,567
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2021		366
2019		15,009
Prior		59,345
Revolving Loans		818
Total loans		75,538
Grade 5 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		22,546
2021		11,078
2020		1,277
2019		439
Prior		1,052
Revolving Loans		8,434
Total loans		44,826
Grade 5 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
Revolving Loans		5
Total loans		5
Grade 6 [Member]
Financing Receivable Impaired [Line Items]
2023		44
2022		425
2021		6,377
2020		16,102
2019		19,249
Prior		93,956
Revolving Loans		8,985
Revolving Loans Converted to Term Loans		34
Total loans		145,172
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
2021		5,572
2020		3,012
Prior		1,190
Total loans		9,774
Grade 6 [Member] | Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2023
2022
2021		119
Prior		478
Total loans		597
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2020		15
2019		142
Prior		1,821
Total loans		1,978
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2021		386
2020		12,069
2019		17,644
Prior		89,426
Total loans		119,525
Grade 6 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2023		44
2022		425
2021		300
2020		1,006
2019		1,463
Prior		1,041
Revolving Loans		8,985
Revolving Loans Converted to Term Loans		34
Total loans		13,298
Grade 7 [Member]
Financing Receivable Impaired [Line Items]
2022		18,140
2021		5,052
2020		3,872
2019		5,511
Prior		21,005
Revolving Loans		4,125
Revolving Loans Converted to Term Loans		18
Total loans		57,723
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
Prior		1,588
Revolving Loans		272
Total loans		1,860
Grade 7 [Member] | Real Estate [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Impaired [Line Items]
2021		1,014
2019		17
Prior		168
Total loans		1,199
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Impaired [Line Items]
2022		2,538
2021		3,966
2020		2,521
2019		1,666
Prior		8,434
Total loans		19,125
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Impaired [Line Items]
2019		3,653
Prior		9,613
Total loans		13,266
Grade 7 [Member] | Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
2022		15,602
2021		72
2020		1,311
2019		171
Prior		1,202
Revolving Loans		3,853
Revolving Loans Converted to Term Loans		18
Total loans		22,229
Grade 7 [Member] | Consumer and Other [Member]
Financing Receivable Impaired [Line Items]
2020		40
2019		4
Total loans		$ 44
[1] Includes $ 10.7 million and $ 554 thousand of residential mortgage loans held for sale at June 30, 2023 and December 31, 2022 , respectively.

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses - Risk Grade by Category of Loan and Year of Origination/Renewal (Parenthetical) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable Impaired [Line Items]
Loans held for sale	$ 10,656	$ 554
Residential Mortgage Loans [Member]
Financing Receivable Impaired [Line Items]
Loans held for sale	$ 10,656	$ 554

Loans and Allowance for Cred_14

Loans and Allowance for Credit Losses - Allowance for Credit Losses on Loans by Category of Loan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance	$ 282,191,000	$ 285,163,000	$ 281,576,000	$ 286,380,000
Initial allowance on loans purchased with credit deterioration	67,099,000		67,099,000
Provision for credit losses	11,984,000	0	11,984,000	0
Charge-offs	(16,833,000)	(1,460,000)	(19,024,000)	(4,067,000)
Recoveries	768,000	256,000	3,574,000	1,646,000
Net charge-offs	(16,065,000)	(1,204,000)	(15,450,000)	(2,421,000)
Allowance for credit losses, ending balance	345,209,000	283,959,000	345,209,000	283,959,000
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance	8,061,000	7,903,000	7,699,000	7,759,000
Initial allowance on loans purchased with credit deterioration	2,914,000		2,914,000
Provision for credit losses	201,000	426,000	557,000	467,000
Charge-offs	(113,000)		(113,000)	(155,000)
Recoveries	191,000	9,000	197,000	267,000
Net charge-offs	78,000	9,000	84,000	112,000
Allowance for credit losses, ending balance	11,254,000	8,338,000	11,254,000	8,338,000
Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance			281,576,000
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance	80,561,000	61,007,000	78,853,000	58,897,000
Initial allowance on loans purchased with credit deterioration	15,237,000		15,237,000
Provision for credit losses	(3,890,000)	2,717,000	(2,195,000)	5,257,000
Charge-offs	(77,000)		(77,000)	(435,000)
Recoveries	27,000	5,000	40,000	10,000
Net charge-offs	(50,000)	5,000	(37,000)	(425,000)
Allowance for credit losses, ending balance	91,858,000	63,729,000	91,858,000	63,729,000
Real Estate [Member] | 1-4 Family [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance	62,538,000	59,368,000	60,795,000	56,710,000
Initial allowance on loans purchased with credit deterioration	1,590,000		1,590,000
Provision for credit losses	3,524,000	696,000	5,127,000	3,441,000
Charge-offs	(36,000)		(101,000)	(100,000)
Recoveries	106,000	32,000	311,000	45,000
Net charge-offs	70,000	32,000	210,000	(55,000)
Allowance for credit losses, ending balance	67,722,000	60,096,000	67,722,000	60,096,000
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance	67,972,000	74,103,000	66,272,000	75,005,000
Initial allowance on loans purchased with credit deterioration	21,002,000		21,002,000
Provision for credit losses	12,748,000	3,697,000	14,447,000	(4,965,000)
Charge-offs	(14,975,000)		(14,975,000)	(39,000)
Recoveries	18,000	(395,000)	19,000	10,000
Net charge-offs	(14,957,000)	(395,000)	(14,956,000)	(29,000)
Allowance for credit losses, ending balance	86,765,000	70,011,000	86,765,000	70,011,000
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance	57,296,000	76,303,000	62,319,000	80,412,000
Initial allowance on loans purchased with credit deterioration	26,332,000		26,332,000
Provision for credit losses	(1,498,000)	(806,000)	(7,993,000)	(4,901,000)
Charge-offs	(341,000)	(192,000)	(1,242,000)	(663,000)
Recoveries	181,000	389,000	2,554,000	846,000
Net charge-offs	(160,000)	197,000	1,312,000	183,000
Allowance for credit losses, ending balance	81,970,000	75,694,000	81,970,000	75,694,000
Consumer and Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses, beginning balance	5,763,000	6,479,000	5,638,000	7,597,000
Initial allowance on loans purchased with credit deterioration	24,000		24,000
Provision for credit losses	899,000	664,000	2,041,000	701,000
Charge-offs	(1,291,000)	(1,268,000)	(2,516,000)	(2,675,000)
Recoveries	245,000	216,000	453,000	468,000
Net charge-offs	(1,046,000)	(1,052,000)	(2,063,000)	(2,207,000)
Allowance for credit losses, ending balance	$ 5,640,000	$ 6,091,000	$ 5,640,000	$ 6,091,000

Loans and Allowance for Cred_15

Loans and Allowance for Credit Losses - Rollforward of Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Off-Balance-Sheet, Credit Loss, Liability [Abstract]
Allowance for credit losses on off-balance sheet credit exposures, Beginning Balance	$ 29,947	$ 29,947
Provision for credit losses on off-balance sheet credit exposures	6,556	6,556
Allowance for credit losses on off-balance sheet credit exposures, Ending Balance	$ 36,503	$ 36,503

Loans and Allowance for Cred_16

Loans and Allowance for Credit Losses - Schedule of Amortized Cost of Loans Experiencing Financial Difficulty and Modified (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 2,773	$ 7,006
Percentage of total loans held for investment	0.02%	0.04%
Payment Delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,294	$ 1,294
Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1,175	5,408
Interest Rate Reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	304	304
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,294	$ 1,294
Percentage of total loans held for investment	0.01%	0.01%
Real Estate [Member] | Payment Delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,294	$ 1,294
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 304	$ 304
Percentage of total loans held for investment	0%	0%
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 304	$ 304
Construction, Land Development and Other Land Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,175	$ 5,408
Percentage of total loans held for investment	0.01%	0.03%
Construction, Land Development and Other Land Loans [Member] | Term Extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,175	$ 5,408

Loans and Allowance for Cred_17

Loans and Allowance for Credit Losses - Schedule of Financial Effects of Loan Modifications (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial Effect	Short-term principal deferral	Short-term principal deferral
Construction, Land Development and Other Land Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial Effect	Short-term extension	Short-term extension
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial Effect	Reduced contractual interest rate	Reduced contractual interest rate

Fair Value - Fair Value Assets

Fair Value - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available for sale securities:
Available for sale securities, at fair value	$ 462,013	$ 456,502
Corporate Debt Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	21,851
Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for sale securities, at fair value	462,013	456,502
Fair Value, Measurements, Recurring [Member] | Loan Customer Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	5,318	5,522
Fair Value, Measurements, Recurring [Member] | Financial Institution Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	5,318	5,522
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	203	94
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	1	6
Fair Value, Measurements, Recurring [Member] | Forward Mortgage-Backed Securities Trades [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	122	31
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	10
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	21,851
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	462,013	456,502
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Loan Customer Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	5,318	5,522
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Institution Counterparty [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	5,318	5,522
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Lock Commitments [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	203	94
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	1	6
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Forward Mortgage-Backed Securities Trades [Member]
Derivative financial instruments:
Derivative financial instruments, assets at fair value	122	31
Derivative financial instruments:
Derivative financial instruments, liabilities at fair value	10
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	21,851
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]
Available for sale securities:
Available for sale securities, at fair value	342,815	357,402
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	342,815	357,402
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member]
Available for sale securities:
Available for sale securities, at fair value	97,347	99,100
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities, at fair value	$ 97,347	$ 99,100

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Other real estate, additions	$ 1.1	$ 1.6
Real estate owned outstanding		1.1
Additions to impaired loans	17.1	22.5
Impaired loans outstanding	$ 17.1	$ 20.8

Fair Value - Summary of Carryin

Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 396,848	$ 423,832
Federal funds sold	181	301
Held to maturity securities	11,647,080	12,387,125
Loans held for sale	10,656	554
Loans held for investment	20,494,407	18,098,653
Other real estate owned	3,107	1,963
Liabilities
Noninterest-bearing	10,364,921	10,915,448
Interest-bearing	17,015,965	17,618,083
Other borrowings	4,800,000	1,850,000
Securities sold under repurchase agreements	434,160	428,134
Subordinated debentures	3,093
Carrying Amount [Member]
Assets
Cash and due from banks	396,848	423,832
Federal funds sold	181	301
Held to maturity securities	13,205,306	14,019,503
Loans held for sale	10,656	554
Loans held for investment, net of allowance	20,149,198	17,817,077
Loans held for investment	1,148,883	740,620
Other real estate owned	3,107	1,963
Liabilities
Noninterest-bearing	10,364,921	10,915,448
Interest-bearing	17,015,965	17,618,083
Other borrowings	4,800,000	1,850,000
Securities sold under repurchase agreements	434,160	428,134
Subordinated debentures	3,093
Estimated Fair Value [Member]
Assets
Cash and due from banks	396,848	423,832
Federal funds sold	181	301
Held to maturity securities	11,647,080	12,387,125
Loans held for sale	10,656	554
Loans held for investment, net of allowance	19,488,281	17,550,309
Loans held for investment	1,148,883	740,620
Other real estate owned	3,107	1,963
Liabilities
Noninterest-bearing	10,364,921	10,915,448
Interest-bearing	16,963,645	17,563,711
Other borrowings	4,712,812	1,850,000
Securities sold under repurchase agreements	434,102	428,061
Subordinated debentures	3,088
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Cash and due from banks	396,848	423,832
Federal funds sold	181	301
Estimated Fair Value [Member] | Level 2 [Member]
Assets
Held to maturity securities	11,647,080	12,387,125
Loans held for sale	10,656	554
Loans held for investment	1,148,883	740,620
Other real estate owned	3,107	1,963
Liabilities
Noninterest-bearing	10,364,921	10,915,448
Interest-bearing	16,963,645	17,563,711
Other borrowings	4,712,812	1,850,000
Securities sold under repurchase agreements	434,102	428,061
Subordinated debentures	3,088
Estimated Fair Value [Member] | Level 3 [Member]
Assets
Loans held for investment, net of allowance	$ 19,488,281	$ 17,550,309

Goodwill and Core Deposit Int_3

Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Beginning balance			$ 3,231,636	$ 3,231,636	$ 3,231,636
Goodwill, First Bancshares Merger			152,062
Goodwill, Ending balance	$ 3,383,698		3,383,698		3,231,636
Core Deposit Intangibles, Beginning balance			51,348	61,684	61,684
Core Deposit Intangibles, Amortization	(3,167)	$ (2,581)	(5,541)	$ (5,201)	(10,336)
Core Deposit Intangibles, First Bancshares Merger			25,321
Core Deposit Intangibles, Ending balance	$ 71,128		$ 71,128		$ 51,348

Goodwill and Core Deposit Int_4

Goodwill and Core Deposit Intangibles - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule Of Intangible Assets And Goodwill [Line Items]
Impairment recorded on goodwill and core deposit intangibles			$ 0
Amortization expense related to intangible assets	$ 3,167,000	$ 2,581,000	$ 5,541,000	$ 5,201,000	$ 10,336,000
Minimum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, useful life	10 years		10 years
Maximum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, useful life	15 years		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	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2023	$ 7,135
2024	12,813
2025	11,409
2026	10,376
2027	9,288
Thereafter	20,107
Total	$ 71,128	$ 51,348	$ 61,684

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 03, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation expense related to stock-based compensation arrangements	$ 13.3		$ 13.3
Weighted-average period of cost expected to be recognized			1 year 9 months 3 days
Number of shares outstanding	0		0
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 2.7	$ 2.7	$ 5.9	$ 5.6
2020 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares authorized for issuance					2,500,000
Number of restricted shares granted			510,093
Share issued			65,432

Contractual Obligations and O_3

Contractual Obligations and Off-Balance Sheet Items - Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances (Details) - Guarantee Obligations [Member] $ in Thousands	Jun. 30, 2023 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	$ 2,895,350
More than 1 year but less than 3 years	1,015,819
3 years or more but less than 5 years	322,725
5 years or more	1,948,794
Total	6,182,688
Payment Guarantee [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	4,941,858
More than 1 year but less than 3 years	487
3 years or more but less than 5 years	487
5 years or more	4,512
Total	4,947,344
Payment Guarantee [Member] | Subordinated Debentures [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	244
More than 1 year but less than 3 years	487
3 years or more but less than 5 years	487
5 years or more	4,512
Total	5,730
Payment Guarantee [Member] | Bank Term Funding Program [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	3,141,614
Total	3,141,614
Payment Guarantee [Member] | Federal Home Loan Bank Advances [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	1,800,000
Total	$ 1,800,000

Contractual Obligations and O_4

Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) SubleaseArrangement	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
Operating lease, right-of-use asset	$ 40,700		$ 40,700
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets
Operating lease, liability	$ 40,700		$ 40,700
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities		Other liabilities
Number of sublease arrangement | SubleaseArrangement			1
Sublease income	$ 688	$ 800	$ 1,500	$ 1,600
Operating lease, weighted average remaining lease term	5 years 2 months 12 days		5 years 2 months 12 days
Operating lease, weighted average discount rate, percent	2.70%		2.70%
Operating lease, payments	$ 3,100	2,700	$ 5,900	5,500
Right-of-Use asset obtained in exchange for operating lease liability			3,000
Allowance for credit losses on off-balance sheet credit exposures	36,503	$ 29,947	36,503	$ 29,947	$ 29,947	$ 29,947	$ 29,947	$ 29,947
Merger [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Right-of-Use asset obtained in exchange for operating lease liability			2,700
Subordinated Notes [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Interest payable	2,600		2,600
Bank Term Funding Program [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Interest payable	$ 141,600		$ 141,600
Minimum [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Lessee operating lease remaining lease term	1 year		1 year
Maximum [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
Lessee operating lease remaining lease term	17 years		17 years

Contractual Obligations and O_5

Contractual Obligations and Off-Balance Sheet Items - Future Undiscounted Cash Payments Associated with its Operating Leases (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Leases [Abstract]
Remaining 2023	$ 5,469
2024	10,229
2025	9,663
2026	8,536
2027	5,568
2028	2,588
Thereafter	5,283
Total undiscounted lease payments	$ 47,336

Contractual Obligations and O_6

Contractual Obligations and Off-Balance Sheet Items - Summary of Commitments Associated with Outstanding Standby Letters of Credit and Commitments to Extend Credit (Details) - Guarantee Obligations [Member] $ in Thousands	Jun. 30, 2023 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	$ 2,895,350
More than 1 year but less than 3 years	1,015,819
3 years or more but less than 5 years	322,725
5 years or more	1,948,794
Total	6,182,688
Standby Letters of Credit [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	70,552
More than 1 year but less than 3 years	8,001
3 years or more but less than 5 years	2,578
5 years or more	26
Total	81,157
Unused capacity on Warehouse Purchase Program loans [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	959,117
Total	959,117
Commitments to Extend Credit [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	1,865,681
More than 1 year but less than 3 years	1,007,818
3 years or more but less than 5 years	320,147
5 years or more	1,948,768
Total	$ 5,142,414

Other Comprehensive Income - Ta

Other Comprehensive Income - Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Equity [Abstract]
Change in unrealized gain (loss) during period, before tax amount	$ 1,006	$ (598)	$ 1,002	$ (773)
Change in unrealized gain (loss) during period, tax effect	(211)	125	(210)	162
Change in unrealized gain (loss) during period, net of tax amount	795	(473)	792	(611)
Total securities available for sale, before tax amount	1,006	(598)	1,002	(773)
Total securities available for sale, tax effect	(211)	125	(210)	162
Total securities available for sale, net of tax amount	795	(473)	792	(611)
Total other comprehensive income (loss), before tax amount	1,006	(598)	1,002	(773)
Total other comprehensive income (loss), tax effect	(211)	125	(210)	162
Other comprehensive income (loss), net of tax	$ 795	$ (473)	$ 792	$ (611)

Other Comprehensive Income - Ac

Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Loss) Associated with Securities Available for Sale, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Beginning balance, accumulated other comprehensive income			$ (3,473)	$ 1,809
Other comprehensive income (loss)	$ 795	$ (473)	792	(611)
Ending balance, accumulated other comprehensive income	(2,681)	1,198	(2,681)	1,198
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance, accumulated other comprehensive income			(3,473)	1,809
Other comprehensive income (loss)			792	(611)
Ending balance, accumulated other comprehensive income	$ (2,681)	$ 1,198	$ (2,681)	$ 1,198

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Notional Balances and Fair Value of Derivative Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Interest Rate Lock Commitments [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	$ 16,447	$ 4,599
Derivative financial instruments, assets at fair value	203	94
Derivative financial instruments, liabilities at fair value	1	6
Forward Mortgage-Backed Securities Trades [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	27,250	5,250
Derivative financial instruments, assets at fair value	122	31
Derivative financial instruments, liabilities at fair value	10
Commercial Loan Interest Rate Swaps and Caps [Member] | Loan Customer Counterparty [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	67,657	93,214
Derivative financial instruments, liabilities at fair value	5,318	5,522
Commercial Loan Interest Rate Swaps and Caps [Member] | Financial Institution Counterparty [Member]
Derivatives Fair Value [Line Items]
Outstanding Notional Balance	67,657	93,214
Derivative financial instruments, assets at fair value	$ 5,318	$ 5,522

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]	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Weighted-Average Interest Rate Received	0.0308	0.0305
Weighted-Average Interest Rate Paid	0.0659	0.0518

Derivative Financial Instrume_5

Derivative Financial Instruments - Additional Information (Details) - Interest Rate Swap [Member] - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Credit exposure	$ 5,300,000	$ 5,500,000
Cash collateral pledged	0	$ 0
Financial Institution Counterparty [Member]
Derivative [Line Items]
Credit exposure	$ 358,000

Derivative Financial Instrume_6

Derivative Financial Instruments - Schedule of Income (Loss) from Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest Rate Lock Commitments [Member]
Derivative Instruments Gain Loss [Line Items]
Derivatives not designated as hedging instruments	$ 84	$ 173	$ 114	$ (5)
Forward Mortgage-Backed Securities Trades [Member]
Derivative Instruments Gain Loss [Line Items]
Derivatives not designated as hedging instruments	$ 208	$ 163	$ 158	$ 479

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details)			3 Months Ended		6 Months Ended
	May 31, 2023 Office	Oct. 11, 2022 USD ($) Office shares	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 07, 2022 $ / shares	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 3,383,698,000		$ 3,383,698,000			$ 3,231,636,000		$ 3,231,636,000
Core deposit intangibles			71,128,000		71,128,000			51,348,000		$ 61,684,000
Total assets			39,905,131,000		39,905,131,000			37,689,829,000
Loans			21,308,737,000		21,308,737,000			18,558,251,000
Total deposits			27,380,886,000		27,380,886,000			$ 28,533,531,000
Merger related expenses			12,891,000		13,751,000
Provision for credit losses			18,540,000		18,540,000
Provision for credit losses on loans			11,984,000	$ 0	11,984,000	$ 0
Provision for credit losses on off-balance sheet credit exposures			6,556,000		$ 6,556,000
First Bancshares of Texas, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, equity interest issued or issuable, number of shares | shares					3,583,370
Payments to acquire businesses in cash					$ 91,500,000
Goodwill			152,100,000		152,100,000
Core deposit intangibles			$ 25,300,000		$ 25,300,000
Total assets							$ 2,140,000,000
Loans							1,650,000,000
Total deposits							$ 1,710,000,000
Business acquisition, closing share price | $ / shares			$ 62.62		$ 62.62
Provision for credit losses on loans			$ 12,000,000
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]
Business acquisition, equity interest issued or issuable, number of shares | shares		2,376,182
Payments to acquire businesses in cash		$ 64,100,000
Total assets			1,280,000,000		$ 1,280,000,000
Loans			1,070,000,000		1,070,000,000
Total deposits			$ 1,120,000,000		$ 1,120,000,000
Business acquisition, closing share price | $ / shares									$ 69.27
Total consideration		$ 228,700,000
Lone Star State Bancshares Inc [Member] | West Texas [Member]
Business Acquisition [Line Items]
Number of banking offices | Office		5