Stellar Bancorp (STEL) 10-Q 26 Apr 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	Apr. 24, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-38280
Entity Registrant Name	Stellar Bancorp, Inc.
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	20-8339782
Entity Address, Address Line One	9 Greenway Plaza
Entity Address, Address Line Two	Suite 110
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77046
City Area Code	713
Local Phone Number	210-7600
Title of 12(b) Security	Common Stock, par value, $0.01 per share
Trading Symbol	STEL
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		53,556,949
Entity Central Index Key	0001473844
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks	$ 74,663	$ 121,004
Interest-bearing deposits at other financial institutions	325,079	278,233
Total cash and cash equivalents	399,742	399,237
Available for sale securities, at fair value	1,523,100	1,395,680
Loans held for investment	7,908,111	7,925,133
Less: allowance for credit losses on loans	(96,285)	(91,684)
Loans, net	7,811,826	7,833,449
Accrued interest receivable	45,466	44,244
Premises and equipment, net	115,698	118,683
Federal Home Loan Bank stock	16,050	25,051
Bank-owned life insurance	105,671	105,084
Goodwill	497,318	497,318
Core deposit intangibles, net	110,513	116,712
Other assets	103,838	111,681
TOTAL ASSETS	10,729,222	10,647,139
Deposits:
Noninterest-bearing	3,323,149	3,546,815
Interest-bearing
Demand	1,576,261	1,659,999
Money market and savings	2,203,767	2,136,777
Certificates and other time	1,691,539	1,529,876
Total interest-bearing deposits	5,471,567	5,326,652
Total deposits	8,794,716	8,873,467
Accrued interest payable	12,227	11,288
Borrowed funds	215,000	50,000
Subordinated debt	109,864	109,765
Other liabilities	66,717	81,601
Total liabilities	9,198,524	9,126,121
COMMITMENTS AND CONTINGENCIES (See Note 13)
SHAREHOLDERS’ EQUITY:
Preferred stock, $0.01 par value; 10,000,000 shares authorized; no shares issued or outstanding at March 31, 2024 and December 31, 2023	0	0
Common stock, $0.01 par value; 140,000,000 shares authorized; 53,550,820 shares issued and outstanding at March 31, 2024 and 53,291,079 shares issued and outstanding at December 31, 2023	536	533
Capital surplus	1,235,221	1,232,627
Retained earnings	425,130	405,945
Accumulated other comprehensive loss	(130,189)	(118,087)
Total shareholders’ equity	1,530,698	1,521,018
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 10,729,222	$ 10,647,139

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	140,000,000	140,000,000
Common stock, shares issued (in shares)	53,550,820	53,291,079
Common stock, shares outstanding (in shares)	53,550,820	53,291,079

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
INTEREST INCOME:
Loans, including fees	$ 134,685	$ 125,729
Securities:
Taxable	9,293	9,653
Tax-exempt	818	1,262
Deposits in other financial institutions	3,627	3,771
Total interest income	148,423	140,415
INTEREST EXPENSE:
Demand, money market and savings deposits	27,530	18,037
Certificates and other time deposits	15,084	3,307
Borrowed funds	1,774	1,317
Subordinated debt	1,917	1,927
Total interest expense	46,305	24,588
NET INTEREST INCOME	102,118	115,827
Provision for credit losses	4,098	3,666
Net interest income after provision for credit losses	98,020	112,161
NONINTEREST INCOME:
Service charges on deposit accounts	1,598	1,349
Gain on sale of assets	513	198
Bank-owned life insurance income	587	522
Debit card and ATM income	527	1,698
Other	3,071	3,731
Total noninterest income	6,296	7,498
NONINTEREST EXPENSE:
Salaries and employee benefits	41,376	39,775
Net occupancy and equipment	4,390	4,088
Depreciation	1,964	1,836
Data processing and software amortization	4,894	5,054
Professional fees	2,662	1,527
Regulatory assessments and FDIC insurance	1,854	1,294
Amortization of intangibles	6,212	6,879
Communications	937	701
Advertising	765	839
Acquisition and merger-related expenses	0	6,165
Other	6,356	4,440
Total noninterest expense	71,410	72,598
INCOME BEFORE INCOME TAXES	32,906	47,061
Provision for income taxes	6,759	9,913
NET INCOME	$ 26,147	$ 37,148
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.49	$ 0.70
Diluted (in dollars per share)	0.49	0.70
DIVIDENDS PER SHARE (in dollars per share)	$ 0.13	$ 0.13

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 26,147	$ 37,148
Unrealized (loss) gain on securities:
Change in unrealized holding (loss) gain on available for sale securities during the period	(15,330)	37,965
Reclassification of gain realized on securities	0	(234)
Total other comprehensive (loss) income	(15,330)	37,731
Deferred tax benefit (expense) related to other comprehensive loss	3,228	(7,751)
Other comprehensive (loss) income, net of tax	(12,102)	29,980
Comprehensive income	$ 14,045	$ 67,128

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2022		52,954,985
Balance at Dec. 31, 2022	$ 1,383,176	$ 530	$ 1,222,761	$ 303,146	$ (143,261)
Net income	37,148			37,148
Other comprehensive income (loss)	29,980				29,980
Cash dividends declared	(6,926)			(6,926)
Common stock issued in connection with the exercise of stock options and restricted stock awards (in shares)		341,053
Common stock issued in connection with the exercise of stock options and restricted stock awards	257	$ 3	254
Stock-based compensation expense	2,581		2,581
Balance (in shares) at Mar. 31, 2023		53,296,038
Balance at Mar. 31, 2023	1,446,216	$ 533	1,225,596	333,368	(113,281)
Balance (in shares) at Dec. 31, 2023		53,291,079
Balance at Dec. 31, 2023	1,521,018	$ 533	1,232,627	405,945	(118,087)
Net income	26,147			26,147
Other comprehensive income (loss)	(12,102)				(12,102)
Cash dividends declared	(6,962)			(6,962)
Common stock issued in connection with the exercise of stock options and restricted stock awards (in shares)		259,741
Common stock issued in connection with the exercise of stock options and restricted stock awards	(250)	$ 3	(253)
Stock-based compensation expense	2,847		2,847
Balance (in shares) at Mar. 31, 2024		53,550,820
Balance at Mar. 31, 2024	$ 1,530,698	$ 536	$ 1,235,221	$ 425,130	$ (130,189)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Per share amount of cash dividends declared (in dollars per share)	$ 0.13	$ 0.13

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 26,147	$ 37,148
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and intangibles amortization	8,176	8,715
Net accretion of discount on loans	(8,551)	(10,093)
Net amortization of premium (discount) on securities	2,671	(110)
Provision for credit losses	4,098	3,666
Deferred income tax expense	2,503	453
Stock based compensation expense	2,847	2,581
Net change in operating leases	1,553	981
Bank owned life insurance income	(587)	(522)
Federal Home Loan Bank stock dividends	(493)	(207)
Gain on sale of assets	(513)	(198)
Excess tax benefit from stock based compensation	(35)	(47)
Decrease in accrued interest receivable and other assets	5,913	12,129
Decrease in accrued interest payable and other liabilities	(12,629)	(5,479)
Net cash provided by operating activities	31,100	49,017
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of available for sale securities	(185,721)	(22,218)
Proceeds from maturities and principal paydowns of available for sale securities	35,196	27,997
Proceeds from sales and calls of available for sale securities	5,112	320,691
Net change in total loans	24,859	(121,392)
Purchase of bank premises and equipment	(564)	(1,238)
Proceeds from sale of bank premises, equipment and other real estate	1,992	3,597
Net redemptions (purchases) of Federal Home Loan Bank stock	9,494	(4,411)
Net cash (used in) provided by investing activities	(109,632)	203,026
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in noninterest-bearing deposits	(223,666)	(352,310)
Net increase (decrease) in interest-bearing deposits	144,915	(176,436)
Net change in borrowed funds	165,000	175,000
Dividends paid to common shareholders	(6,962)	(6,926)
(Payments made) proceeds from the issuance of restricted stock and stock option exercises	(250)	257
Net cash provided by (used in) financing activities	79,037	(360,415)
NET CHANGE IN CASH AND CASH EQUIVALENTS	505	(108,372)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	399,237	371,705
CASH AND CASH EQUIVALENTS, END OF PERIOD	399,742	263,333
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	45,366	22,811
Cash paid for operating lease liabilities	$ 1,204	$ 1,100

NATURE OF OPERATIONS AND SUMMAR

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES	NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES Nature of Operations —Stellar Bancorp, Inc. (“Stellar”) through its wholly-owned subsidiary, Stellar Bank, (the “Bank”), and together with Stellar, collectively referred to herein as “we,” “us,” “our” and the “Company”), provides a diversified range of commercial banking services primarily to small- to medium-sized businesses. Stellar derives substantially all of its revenues and income from the operation of the Bank. The Company is focused on delivering a wide variety of relationship-driven commercial banking products and community-oriented services tailored to meet the needs of small-to medium-sized businesses, professionals and individuals through its 54 banking centers with 37 banking centers in the Houston metropolitan statistical area (“MSA”), 16 banking centers in the Beaumont MSA and one banking center in Dallas, Texas. Basis of Presentation —The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in accordance with guidance provided by the Securities and Exchange Commission (“SEC”). Accordingly, the condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments considered 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. Transactions between Stellar and the Bank have been eliminated. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023. Operating results for the three months ended March 31, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024. Reclassification s —Certain items in the prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or shareholders’ equity. Significant Accounting and Reporting Policie s —The Company’s significant accounting and reporting policies can be found in Note 1 of the Company’s annual financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023. Recent Accounting Standards Accounting Standards Update ( “ ASU ” ) 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS Changes in the carrying amount of the Company’s goodwill and core deposit intangible assets were as follows: Goodwill Core Deposit Servicing Assets (In thousands) Balance as of December 31, 2022 $ 497,260 $ 143,525 $ 309 Amortization — (26,813) (70) Goodwill true-up 58 — — Decrease due to payoff of serviced loans — — (27) Balance as of December 31, 2023 497,318 116,712 212 Amortization — (6,199) (13) Balance as of March 31, 2024 $ 497,318 $ 110,513 $ 199 Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired recorded on the acquisition date of an entity. During the measurement period, the Company may record subsequent adjustments to goodwill for provisional amounts recorded at the acquisition date. Goodwill is subject to impairment testing, which must be conducted at least annually or upon the occurrence of a triggering event. Various factors, such as the Company’s results of operations, the trading price of the Company’s common stock relative to the book value per share, macroeconomic conditions and conditions in the banking sector, inform whether a triggering event for an interim goodwill impairment test has occurred. Goodwill is recorded and evaluated for impairment at its reporting unit, the Company. The Company's policy is to test goodwill for impairment annually as of October 1st, or on an interim basis if an event triggering an impairment assessment is determined to have occurred. Testing of goodwill impairment comprises a two-step process. First, the Company performs a qualitative assessment to evaluate relevant events or circumstances to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that an impairment has occurred, it proceeds to the quantitative impairment test, whereby it calculates the fair value of the reporting unit and compares it with its carrying amount, including goodwill. In its performance of impairment testing, the Company has the unconditional option to proceed directly to the quantitative impairment test, bypassing the qualitative assessment. If the carrying amount of the reporting unit exceeds the fair value, the amount by which the carrying amount exceeds fair value, up to the carrying value of goodwill, is recorded through earnings as an impairment charge. If the results of the qualitative assessment indicate that it is not more likely than not that an impairment has occurred, or if the quantitative impairment test results in a fair value of the reporting unit that is greater than the carrying amount, then no impairment charge is recorded. The estimated aggregate future amortization expense for core deposit intangible assets remaining as of March 31, 2024 is as follows (in thousands): Remaining 2024 $ 17,967 2025 21,528 2026 18,896 2027 16,272 Thereafter 35,850 Total $ 110,513

SECURITIES

SECURITIES	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The amortized cost and fair value of securities available for sale were as follows: March 31, 2024 Amortized Gross Gross Fair (In thousands) Available for Sale U.S. government and agency securities $ 299,366 $ 69 $ (10,070) $ 289,365 Municipal securities 222,809 1,166 (27,227) 196,748 Agency mortgage-backed pass-through securities 454,639 39 (42,673) 412,005 Agency collateralized mortgage obligations 593,435 185 (72,751) 520,869 Corporate bonds and other 117,631 34 (13,552) 104,113 Total $ 1,687,880 $ 1,493 $ (166,273) $ 1,523,100 December 31, 2023 Amortized Gross Gross Fair (In thousands) Available for Sale U.S. government and agency securities $ 307,529 $ 90 $ (10,201) $ 297,418 Municipal securities 229,615 1,615 (27,171) 204,059 Agency mortgage-backed pass-through securities 424,664 370 (37,161) 387,873 Agency collateralized mortgage obligations 462,498 172 (64,553) 398,117 Corporate bonds and other 120,824 56 (12,667) 108,213 Total $ 1,545,130 $ 2,303 $ (151,753) $ 1,395,680 As of March 31, 2024, no allowance for credit losses has been recognized on available for sale securities in an unrealized loss position as management does not believe any of the securities are impaired due to reasons of credit quality. This belief is based upon our analysis of the underlying risk characteristics, including credit ratings, and other qualitative factors related to our available for sale securities and in consideration of our historical credit loss experience and internal forecasts. The issuers of these securities continue to make timely principal and interest payments under the contractual terms of the securities. Furthermore, management does not have the intent to sell any of the securities classified as available for sale in the table above and believes that it is more likely than not that we will not have to sell any such securities before a recovery of cost. The unrealized losses are due to increases in market interest rates over the yields available at 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. The amortized cost and fair value of investment securities at March 31, 2024, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations at any time with or without call or prepayment penalties. Amortized Fair (In thousands) Due in one year or less $ 76,060 $ 74,067 Due after one year through five years 83,030 78,334 Due after five years through ten years 137,346 121,106 Due after ten years 343,370 316,719 Subtotal 639,806 590,226 Agency mortgage-backed pass-through securities and collateralized mortgage obligations 1,048,074 932,874 Total $ 1,687,880 $ 1,523,100 Securities with unrealized losses segregated by length of time in a continuous loss position were as follows: March 31, 2024 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (In thousands) Available for Sale U.S. government and agency securities $ 35,927 $ (628) $ 229,325 $ (9,442) $ 265,252 $ (10,070) Municipal securities 2,159 (16) 172,364 (27,211) 174,523 (27,227) Agency mortgage-backed pass-through securities 104,502 (2,385) 284,000 (40,288) 388,502 (42,673) Agency collateralized mortgage obligations 119,120 (2,905) 335,294 (69,846) 454,414 (72,751) Corporate bonds and other 7,101 (2,637) 89,893 (10,915) 96,994 (13,552) Total $ 268,809 $ (8,571) $ 1,110,876 $ (157,702) $ 1,379,685 $ (166,273) December 31, 2023 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (In thousands) Available for Sale U.S. government and agency securities $ 110,038 $ (2,208) $ 154,145 $ (7,993) $ 264,183 $ (10,201) Municipal securities 1,303 (14) 177,957 (27,157) 179,260 (27,171) Agency mortgage-backed pass-through securities 80,208 (1,444) 257,779 (35,717) 337,987 (37,161) Agency collateralized mortgage obligations 23,051 (621) 348,854 (63,932) 371,905 (64,553) Corporate bonds and other 11,279 (1,452) 85,285 (11,215) 96,564 (12,667) Total $ 225,879 $ (5,739) $ 1,024,020 $ (146,014) $ 1,249,899 $ (151,753) During the three months ended March 31, 2024, the Company had sales and calls of securities of $5.1 million of securities. During the three months ended March 31, 2023, the Company had sales and calls of securities of $320.7 million and recorded gross gains of $234 thousand. At March 31, 2024 and December 31, 2023, the Company did not own securities of any one issuer, other than the U.S. government and its agencies, in an amount greater than 10% of consolidated shareholders’ equity at such respective dates. The carrying value of pledged securities was $601.9 million at March 31, 2024 and $607.5 million at December 31, 2023. The majority of the securities in each case were pledged to collateralize public fund deposits.

LOANS AND ALLOWANCE FOR CREDIT

LOANS AND ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
LOANS AND ALLOWANCE FOR CREDIT LOSSES	LOANS AND ALLOWANCE FOR CREDIT LOSSES The loan portfolio balances, net of unearned income and fees, consist of various types of loans primarily made to borrowers located within Texas and segregated by class of loan were as follows: March 31, 2024 December 31, 2023 (In thousands) Commercial and industrial $ 1,451,462 $ 1,409,002 Paycheck Protection Program (PPP) 4,293 5,100 Real estate: Commercial real estate (including multi-family residential) 4,049,885 4,071,807 Commercial real estate construction and land development 1,039,443 1,060,406 1-4 family residential (including home equity) 1,049,316 1,047,174 Residential construction 252,573 267,357 Consumer and other 61,139 64,287 Total loans 7,908,111 7,925,133 Allowance for credit losses on loans (96,285) (91,684) Loans, net $ 7,811,826 $ 7,833,449 Nonaccrual and Past Due Loans An aging analysis of the recorded investment in past due loans, segregated by class of loans, is included below. The Company defines recorded investment as the outstanding loan balances including net deferred loan fees, and excluding accrued interest receivable of $37.9 million and $37.4 million as of March 31, 2024 and December 31, 2023, respectively, due to immateriality. March 31, 2024 Loans Past Due and Still Accruing Nonaccrual Current Total 30-89 90 or More Total Past (In thousands) Commercial and industrial $ 7,137 $ — $ 7,137 $ 15,465 $ 1,428,860 $ 1,451,462 Paycheck Protection Program (PPP) 81 — 81 — 4,212 4,293 Real estate: Commercial real estate (including multi-family residential) 13,498 — 13,498 21,268 4,015,119 4,049,885 Commercial real estate construction and land development 4,345 — 4,345 8,406 1,026,692 1,039,443 1-4 family residential (including home equity) 6,170 — 6,170 10,368 1,032,778 1,049,316 Residential construction 575 — 575 1,410 250,588 252,573 Consumer and other 11 — 11 212 60,916 61,139 Total loans $ 31,817 $ — $ 31,817 $ 57,129 $ 7,819,165 $ 7,908,111 December 31, 2023 Loans Past Due and Still Accruing Nonaccrual Current Total 30-89 90 or More Total Past (In thousands) Commercial and industrial $ 6,096 $ — $ 6,096 $ 5,048 $ 1,397,858 $ 1,409,002 Paycheck Protection Program (PPP) 375 — 375 — 4,725 5,100 Real estate: Commercial real estate (including multi-family residential) 9,600 — 9,600 16,699 4,045,508 4,071,807 Commercial real estate construction and land development 7,341 — 7,341 5,043 1,048,022 1,060,406 1-4 family residential (including home equity) 3,492 — 3,492 8,874 1,034,808 1,047,174 Residential construction 498 — 498 3,288 263,571 267,357 Consumer and other 64 — 64 239 63,984 64,287 Total loans $ 27,466 $ — $ 27,466 $ 39,191 $ 7,858,476 $ 7,925,133 Credit Quality Indicators The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt. The Company utilizes a risk rating matrix to assign a risk rating to each of its loans. Risk ratings are updated on an ongoing basis and are subject to change by continuous loan monitoring processes including lending management monitoring, executive management and board committee oversight, and independent credit review. 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 certain risk ratings to be used as credit quality indicators including trends related to (1) the weighted-average risk grade of loans, (2) the level of classified loans, (3) the delinquency status of loans, (4) nonperforming loans and (5) the general economic conditions in our market. Individual bankers, under the oversight of credit administration, review updated financial information for all pass grade commercial loans to reassess the risk grade on at least an annual basis. When a loan reaches a set of internally designated criteria, including Substandard or higher, a special assets officer will be involved in the monitoring of the loan on an on-going basis. The following is a general description of the risk ratings used by the Company: Pass —Credits in this category contain an acceptable amount of risk. Special Mention —Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Substandard —Loans classified as substandard have well-defined weaknesses on a continuing basis and are inadequately protected by the current net worth and paying capacity of the borrower, declining collateral values, or a continuing downturn in their industry which is reducing their profits to below zero and having a significantly negative impact on their cash flow. These loans so classified are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful —Loans classified as doubtful have all the weaknesses inherent in those classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full on the basis of currently existing facts, conditions and values, highly questionable and improbable. Loss —Loans classified as loss are to be charged-off or charged-down when payment is acknowledged to be uncertain or when the timing or value of payments cannot be determined. “Loss” is not intended to imply that the loan or some portion of it will never be paid, nor does it in any way imply that there has been a forgiveness of debt. The following table presents risk ratings by category and the gross charge-offs by primary loan type and year of origination or renewal. Generally, current period renewals of credit are re-underwritten at the point of renewal and considered current period originations for purposes of the table below. The following summarizes the amortized cost basis of loans by year of origination/renewal and credit quality indicator by class of loan as of March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Revolving Loans Total Total 2024 2023 2022 2021 2020 Prior (In thousands) Commercial and industrial Pass $ 107,787 $ 292,611 $ 217,128 $ 153,240 $ 35,742 $ 34,744 $ 533,879 $ 33,792 $ 1,408,923 $ 1,377,118 Special Mention — 115 2,270 589 66 325 3,459 1,460 8,284 8,340 Substandard 71 2,374 4,082 968 559 12,585 11,637 1,932 34,208 23,496 Doubtful — 47 — — — — — — 47 48 Total commercial and industrial loans $ 107,858 $ 295,147 $ 223,480 $ 154,797 $ 36,367 $ 47,654 $ 548,975 $ 37,184 $ 1,451,462 $ 1,409,002 Current period gross charge-offs $ — $ — $ 30 $ 85 $ 144 $ — $ 50 $ — $ 309 Paycheck Protection Program (PPP) Pass $ — $ — $ — $ 2,347 $ 1,946 $ — $ — $ — $ 4,293 $ 5,100 Special Mention — — — — — — — — — — Substandard — — — — — — — — — — Doubtful — — — — — — — — — — Total PPP loans $ — $ — $ — $ 2,347 $ 1,946 $ — $ — $ — $ 4,293 $ 5,100 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate (including multi-family residential) Pass $ 96,235 $ 425,893 $ 1,309,676 $ 834,247 $ 417,006 $ 689,186 $ 116,365 $ 20,128 $ 3,908,736 $ 3,959,675 Special Mention 2,745 10,358 11,822 15,343 20,377 7,840 2,659 485 71,629 54,483 Substandard 2,193 9,507 11,559 22,828 7,956 14,991 386 100 69,520 57,649 Doubtful — — — — — — — — — — Total commercial real estate (including multi-family residential) loans $ 101,173 $ 445,758 $ 1,333,057 $ 872,418 $ 445,339 $ 712,017 $ 119,410 $ 20,713 $ 4,049,885 $ 4,071,807 Current period gross charge-offs $ — $ — $ — $ 527 $ — $ — $ — $ — $ 527 Commercial real estate construction and land development Pass $ 78,696 $ 273,479 $ 443,705 $ 105,452 $ 24,665 $ 14,684 $ 61,296 $ 2,772 $ 1,004,749 $ 1,032,789 Special Mention 1,994 1,140 7,801 237 — 478 — — 11,650 9,737 Substandard — 3,280 1,601 17,316 74 79 370 324 23,044 17,880 Doubtful — — — — — — — — — — Total commercial real estate construction and land development $ 80,690 $ 277,899 $ 453,107 $ 123,005 $ 24,739 $ 15,241 $ 61,666 $ 3,096 $ 1,039,443 $ 1,060,406 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 December 31, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans 2024 2023 2022 2021 2020 Prior Total Total (In thousands) 1-4 family residential (including Pass $ 30,500 $ 157,208 $ 266,182 $ 210,530 $ 107,684 $ 137,325 $ 91,132 $ 11,046 $ 1,011,607 $ 1,011,743 Special Mention 173 977 850 1,470 1,816 1,063 — 175 6,524 5,384 Substandard 1,587 1,956 1,419 3,480 2,092 10,722 8,226 1,703 31,185 30,047 Doubtful — — — — — — — — — — Total 1-4 family residential (including home equity) $ 32,260 $ 160,141 $ 268,451 $ 215,480 $ 111,592 $ 149,110 $ 99,358 $ 12,924 $ 1,049,316 $ 1,047,174 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential construction Pass $ 39,851 $ 123,542 $ 74,617 $ 6,142 $ 2,437 $ 489 $ 1,156 $ — $ 248,234 $ 264,069 Special Mention — — — 365 — — — — 365 — Substandard — 3,974 — — — — — — 3,974 3,288 Doubtful — — — — — — — — — — Total residential construction $ 39,851 $ 127,516 $ 74,617 $ 6,507 $ 2,437 $ 489 $ 1,156 $ — $ 252,573 $ 267,357 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Consumer and other Pass $ 14,060 $ 19,415 $ 7,010 $ 2,799 $ 1,673 $ 646 $ 14,663 $ 481 $ 60,747 $ 63,881 Special Mention — — 18 — — — — — 18 67 Substandard — — 110 102 — 10 2 150 374 339 Doubtful — — — — — — — — — — Total consumer and other $ 14,060 $ 19,415 $ 7,138 $ 2,901 $ 1,673 $ 656 $ 14,665 $ 631 $ 61,139 $ 64,287 Current period gross charge-offs $ — $ 5 $ — $ — $ — $ — $ — $ 5 Total loans Pass $ 367,129 $ 1,292,148 $ 2,318,318 $ 1,314,757 $ 591,153 $ 877,074 $ 818,491 $ 68,219 $ 7,647,289 $ 7,714,375 Special Mention 4,912 12,590 22,761 18,004 22,259 9,706 6,118 2,120 98,470 78,011 Substandard 3,851 21,091 18,771 44,694 10,681 38,387 20,621 4,209 162,305 132,699 Doubtful — 47 — — — — — — 47 48 Total loans $ 375,892 $ 1,325,876 $ 2,359,850 $ 1,377,455 $ 624,093 $ 925,167 $ 845,230 $ 74,548 $ 7,908,111 $ 7,925,133 Current period gross charge-offs $ — $ 5 $ 30 $ 612 $ 144 $ — $ 50 $ — $ 841 The following table presents the activity in the allowance for credit losses on loans by portfolio type for the three months ended March 31, 2024 and 2023: Commercial and industrial Paycheck Protection Program (PPP) Commercial real estate (including multi-family residential) Commercial real estate construction and land development 1-4 family residential (including home equity) Residential construction Consumer and other Total (In thousands) Allowance for credit losses on loans: Three Months Ended Balance December 31, 2023 $ 31,979 $ — $ 38,187 $ 13,627 $ 4,785 $ 2,623 $ 483 $ 91,684 Provision for credit losses on loans 5,667 (1,049) 425 265 72 (65) 5,315 Charge-offs (309) — (527) — — — (5) (841) Recoveries 114 — — — 5 — 8 127 Net charge-offs (195) — (527) — 5 — 3 (714) Balance March 31, 2024 $ 37,451 $ — $ 36,611 $ 14,052 $ 5,055 $ 2,695 $ 421 $ 96,285 Three Months Ended Balance December 31, 2022 $ 41,236 $ — $ 32,970 $ 14,121 $ 2,709 $ 1,796 $ 348 $ 93,180 Provision for credit losses on loans (1,502) — 4,716 (542) 116 293 119 3,200 Charge-offs (426) — — — — — (8) (434) Recoveries 208 — 14 — 7 — 13 242 Net charge-offs (218) — 14 — 7 — 5 (192) Balance March 31, 2023 $ 39,516 $ — $ 37,700 $ 13,579 $ 2,832 $ 2,089 $ 472 $ 96,188 Allowance for Credit Losses on Unfunded Commitments In addition to the allowance for credit losses on loans, the Company has established an allowance for credit losses on unfunded commitments, classified in other liabilities and adjusted as a provision for credit loss expense. The allowance represents estimates of expected credit losses over the contractual period in which there is exposure to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. 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 informed by historical analysis looking at utilization rates. The expected credit loss rates applied to the commitments expected to fund is informed by the general valuation allowance utilized for outstanding balances with the same underlying assumptions and drivers. The allowance for credit losses on unfunded commitments as of March 31, 2024 and December 31, 2023 was $10.1 million and $11.3 million, respectively. This reserve is maintained at a level management believes to be sufficient to absorb losses arising from unfunded loan commitments. The Company recorded a reversal of provision of $1.2 million provision on unfunded commitments during the three months ended March 31, 2024 compared to a provision of $466 thousand for the three months ended March 31, 2023. Collateral Dependent Loans Collateral dependent loans are secured by real estate assets, accounts receivable, inventory and equipment. For a collateral dependent loan, the Company’s evaluation process includes a valuation by appraisal or other collateral analysis adjusted for selling costs, when appropriate. This valuation is compared to the remaining outstanding principal balance of the loan. If a loss is determined to be probable, the loss is included in the allowance for credit losses on loans as a specific allocation. The following tables present the amortized cost basis of collateral dependent loans, which are individually evaluated to determine expected credit losses as of March 31, 2024 and December 31, 2023: March 31, 2024 Real Estate Business Assets Other Total (In thousands) Commercial and industrial $ — $ 18 $ — $ 18 Real estate: Commercial real estate (including multi-family residential) 7,410 — — 7,410 Commercial real estate construction and land development 1,179 — — 1,179 1-4 family residential (including home equity) 620 — — 620 Residential construction — — — — Consumer and other — — — — Total $ 9,209 $ 18 $ — $ 9,227 December 31, 2023 Real Estate Business Assets Other Total (In thousands) Commercial and industrial $ — $ 70 $ — $ 70 Real estate: Commercial real estate (including multi-family residential) 5,548 — — 5,548 Commercial real estate construction and land development 437 — — 437 1-4 family residential (including home equity) 424 — — 424 Residential construction — — — — Consumer and other — — — — Total $ 6,409 $ 70 $ — $ 6,479 Nonaccrual Loans The following tables present additional information regarding nonaccrual loans. No interest income was recognized on nonaccrual loans as of March 31, 2024 and December 31, 2023. March 31, 2024 Nonaccrual Loans with No Related Allowance Nonaccrual Loans with Related Allowance Total Nonaccrual Loans (In thousands) Commercial and industrial $ 1,073 $ 14,392 $ 15,465 Paycheck Protection Program (PPP) — — — Real estate: Commercial real estate (including multi-family residential) 15,905 5,363 21,268 Commercial real estate construction and land development 7,664 742 8,406 1-4 family residential (including home equity) 7,310 3,058 10,368 Residential construction — 1,410 1,410 Consumer and other 32 180 212 Total loans $ 31,984 $ 25,145 $ 57,129 December 31, 2023 Nonaccrual Loans with No Related Allowance Nonaccrual Loans with Related Allowance Total Nonaccrual Loans (In thousands) Commercial and industrial $ 1,616 $ 3,432 $ 5,048 Paycheck Protection Program (PPP) — — — Real estate: Commercial real estate (including multi-family residential) 11,844 4,855 16,699 Commercial real estate construction and land development 5,043 — 5,043 1-4 family residential (including home equity) 7,400 1,474 8,874 Residential construction 3,288 — 3,288 Consumer and other 54 185 239 Total loans $ 29,245 $ 9,946 $ 39,191 Loan Modifications Effective January 1, 2023, under ASU 2022-02, loan modifications are reported if concessions have been granted to borrowers that are experiencing financial difficulty. Information on these loan modifications originated after the effective date is presented according to the new accounting guidance. The percentage of loans modified comprised less than 1% of their respective classes of loan portfolios at March 31, 2024. The following tables present information regarding loans that were modified due to the borrowers experiencing financial difficulty during the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 Interest Rate Reduction Term Extension Payment Delay Principal forgiveness Combination Term Extension and Principal Forgiveness Combination Term Extension and Payment Delay Total (In thousands) Commercial and industrial $ — $ 1,059 $ 814 $ — $ — $ 468 $ 2,341 Real estate: Commercial real estate (including multi-family residential) — — 1,800 — — — 1,800 Commercial real estate construction and land development — 2,097 — — — 1,944 4,041 1-4 family residential (including home equity) — — 657 — — — 657 Residential construction — 55 1,173 — — 237 1,465 Consumer and other — — — — — — — Total $ — $ 3,211 $ 4,444 $ — $ — $ 2,649 $ 10,304 Three Months Ended March 31, 2023 Interest Rate Reduction Term Extension Payment Delay Principal forgiveness Combination Term Extension and Principal Forgiveness Combination Term Extension and Payment Delay Total (In thousands) Commercial and industrial $ 96 $ 2,251 $ — $ — $ — $ — $ 2,347 Real estate: Commercial real estate (including multi-family residential) — 798 — — — 798 Commercial real estate construction and land development — — — — — — — 1-4 family residential (including home equity) — 725 — — — — 725 Residential construction — — — — — — — Consumer and other — — — — — — — Total $ 96 $ 3,774 $ — $ — $ — $ — $ 3,870 The following table summarizes, by loan portfolio, the financial effect of the Company's loan modifications for the periods indicated: Three Months Ended March 31, 2024 Three Months Ended March 31, 2023 Weighted-Average Interest Rate Reduction Weighted-Average Term Extension Weighted-Average Interest Rate Reduction Weighted-Average Term Extension (months) (months) Commercial and industrial — % 4 — % 29 Real estate: Commercial real estate (including multi-family residential) — % — — % 6 Commercial real estate construction and land development — % 5 — % — 1-4 family residential (including home equity) — % — — % 12 Residential construction — % 6 — % — Consumer and other — % — — % — The following table summarizes modified loans that had a payment default during the twelve months ended March 31, 2024: Term Extension Payment Delay Combination Term Extension and Payment Delay (In thousands) Commercial and industrial $ 142 $ — $ — Real estate: Commercial real estate (including multi-family residential) — — — Commercial real estate construction and land development 1,727 — — 1-4 family residential (including home equity) — — 69 Residential construction — 1,173 — Consumer and other 92 — — $ 1,961 $ 1,173 $ 69 There were no loans that had payment defaults during the three months ended March 31, 2023 that were modified due to the borrowers experiencing financial difficulty in that period prior to default. Commitments to lend additional amounts to borrowers whose loans were modified in the twelve months ended March 31, 2024 totaled $1.4 million.

LEASES

LEASES	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
LEASES	LEASES At March 31, 2024, the Company had 31 operating leases consisting of branch locations, office facilities and equipment. The right-of-use asset is classified within premises and equipment and the lease liability is included in other liabilities on the balance sheet. The Company also owns certain office facilities which it leases to outside parties under operating lessor leases; however, such leases are not significant. There were no sale and leaseback transactions, leveraged leases or lease transactions with related parties during the three months ended March 31, 2024 and 2023. Supplemental lease information at the dates indicated was as follows: March 31, 2024 December 31, 2023 (Dollars in thousands) Balance Sheet: Operating lease right-of-use asset classified as premises and equipment $ 19,193 $ 20,746 Operating lease liability classified as other liabilities $ 19,658 $ 20,659 Weighted average lease term, in years 7.63 7.67 Weighted average discount rate 4.21 % 4.17 % Lease costs for the dates indicated was as follows: Three Months Ended March 31, 2024 2023 (In thousands) Income Statement: Operating lease cost $ 1,943 $ 1,809 Short-term lease cost 6 5 Total operating lease costs $ 1,949 $ 1,814 The following table summarizes the contractual maturity of the Company’s lease liabilities as of the dates indicated below: March 31, 2024 December 31, 2023 (In thousands) Lease payments due: Within one year $ 3,281 $ 4,428 After one but within two years 4,191 3,978 After two but within three years 3,667 3,430 After three but within four years 3,469 3,227 After four but within five years 3,294 3,047 After five years 6,815 6,605 Total lease payments 24,717 24,715 Less: discount on cash flows (5,059) (4,056) Total lease liability $ 19,658 $ 20,659

FAIR VALUE

FAIR VALUE	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE	FAIR VALUE The Company uses fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Fair value represents the estimated exchange price that would be received from selling an asset or paid to transfer a liability, otherwise known as an “exit price,” in the principal or most advantageous market available to the entity in an orderly transaction between market participants on the measurement date. Fair Value Hierarchy Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. 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 for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. • Level 2—Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. • Level 3—Significant unobservable inputs that reflect management’s judgment and assumptions that market participants would use in pricing an asset or liability that are supported by little or no market activity. The carrying amounts and estimated fair values of financial instruments that are reported on the balance sheet were as follows: March 31, 2024 Carrying Estimated Fair Value Level 1 Level 2 Level 3 Total (In thousands) Financial assets Cash and cash equivalents $ 399,742 $ 399,742 $ — $ — $ 399,742 Available for sale securities 1,523,100 — 1,523,100 — 1,523,100 Loans held for investment, net of allowance 7,811,826 — — 7,583,625 7,583,625 Accrued interest receivable 45,466 297 7,286 37,883 45,466 Financial liabilities Deposits $ 8,794,716 $ — $ 8,788,761 $ — $ 8,788,761 Accrued interest payable 12,227 — 12,227 — 12,227 Borrowed funds 215,000 — 215,000 — 215,000 Subordinated debt 109,864 — 108,739 — 108,739 December 31, 2023 Carrying Estimated Fair Value Level 1 Level 2 Level 3 Total (In thousands) Financial assets Cash and cash equivalents $ 399,237 $ 399,237 $ — $ — $ 399,237 Available for sale securities 1,395,680 — 1,395,680 — 1,395,680 Loans held for investment, net of allowance 7,833,449 — — 7,627,962 7,627,962 Accrued interest receivable 44,244 118 6,716 37,410 44,244 Financial liabilities Deposits $ 8,873,467 $ — $ 8,866,645 $ — $ 8,866,645 Accrued interest payable 11,288 — 11,288 — 11,288 Borrowed funds 50,000 — 50,000 — 50,000 Subordinated debt 109,765 — 109,390 — 109,390 The following tables present fair values for assets and liabilities measured at fair value on a recurring basis. March 31, 2024 Level 1 Level 2 Level 3 Total (In thousands) Financial assets Available for sale securities: U.S. government and agency securities $ — $ 289,365 $ — $ 289,365 Municipal securities — 196,748 — 196,748 Agency mortgage-backed pass-through securities — 412,005 — 412,005 Agency collateralized mortgage obligations — 520,869 — 520,869 Corporate bonds and other — 104,113 — 104,113 Interest rate swaps — 7,370 — 7,370 Credit risk participation agreements — — 13 13 Total fair value of financial assets $ — $ 1,530,470 $ 13 $ 1,530,483 Financial liabilities Interest rate swaps $ — $ 7,370 $ — $ 7,370 Total fair value of financial liabilities $ — $ 7,370 $ — $ 7,370 December 31, 2023 Level 1 Level 2 Level 3 Total (In thousands) Financial assets Available for sale securities: U.S. government and agency securities $ — $ 297,418 $ — $ 297,418 Municipal securities — 204,059 — 204,059 Agency mortgage-backed pass-through securities — 387,873 — 387,873 Agency collateralized mortgage obligations — 398,117 — 398,117 Corporate bonds and other — 108,213 — 108,213 Interest rate swaps — 6,692 — 6,692 Credit risk participation agreements — — 20 20 Total fair value of financial assets $ — $ 1,402,372 $ 20 $ 1,402,392 Financial liabilities Interest rate swaps $ — $ 6,692 $ — $ 6,692 Total fair value of financial liabilities $ — $ 6,692 $ — $ 6,692 There were no transfers between levels during the three months ended March 31, 2024 or 2023. Certain assets, including purchase credit deteriorated and individually evaluated loans with allowances for credit losses and branch assets held for sale, are measured at fair value on a nonrecurring basis. These assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances such as impairment. There were no liabilities measured at fair value on a nonrecurring basis at March 31, 2024 and December 31, 2023. Assets measured on a nonrecurring basis for the periods noted are summarized in the table below. March 31, 2024 Level 1 Level 2 Level 3 (In thousands) Loans: Commercial and industrial $ — $ — $ 18,691 Commercial real estate (including multi-family residential) — — 7,373 Commercial real estate construction and land development — — 8,708 1-4 family residential (including home equity) — — 4,997 Residential construction — — 1,192 Consumer and other — — 85 $ — $ — $ 41,046 December 31, 2023 Level 1 Level 2 Level 3 (In thousands) Loans: Commercial and industrial $ — $ — $ 10,084 Commercial real estate (including multi-family residential) — — 7,134 Commercial real estate construction and land development — — 6,654 1-4 family residential (including home equity) — — 3,892 Consumer and other — — 106 Branch assets held for sale (1) 2,033 — — $ 2,033 $ — $ 27,870 (1) Branch assets held for sale are banking centers that have closed and are for sale.

DEPOSITS

DEPOSITS	3 Months Ended
	Mar. 31, 2024
Deposit Liabilities [Abstract]
DEPOSITS	DEPOSITS Time deposits that met or exceeded the Federal Deposit Insurance Corporation ("FDIC") insurance limit of $250,000 at March 31, 2024 and December 31, 2023 were $542.3 million and $548.4 million, respectively. Scheduled maturities of time deposits for the next five years are as follows (in thousands): Within one year $ 1,538,006 After one but within two years 60,069 Over three years 93,464 Total $ 1,691,539 The Company had $786.6 million and $615.9 million of brokered deposits as of March 31, 2024 and December 31, 2023, respectively. There were no concentrations of deposits with any one depositor at March 31, 2024 and December 31, 2023.

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	DERIVATIVE INSTRUMENTS The Company has outstanding interest rate swap contracts with certain customers and equal and offsetting interest rate swaps with other financial institutions entered into at the same time. These interest rate swap contracts are not designated as hedging instruments for mitigating interest rate risk. The objective of the transactions is to allow customers to effectively convert a variable rate loan to a fixed rate. In connection with each swap transaction, the Company agreed 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 agreed to pay a third-party financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. Because the Company acts as an intermediary for its customer, changes in the fair value of the underlying derivative contracts are designed to offset each other and do not significantly impact the Company’s operating results except in certain situations where there is a significant deterioration in the customer’s credit worthiness or that of the counterparties. At March 31, 2024, management determined there was no such deterioration. At March 31, 2024 and December 31, 2023, the Company had 14 and 15 interest rate swap agreements outstanding with borrowers and financial institutions, respectively. These derivative instruments are not designated as accounting hedges and changes in the net fair value are recognized in other noninterest income. Fair value amounts are included in other assets and other liabilities. At March 31, 2024 and December 31, 2023 the Company had three credit risk participation agreements with another financial institution that are associated with interest rate swaps related to loans for which the Company is the lead agent bank and the other financial institution provides credit protection to the Company should the borrower fail to perform under the terms of the interest rate swap agreements. The fair value of the agreements is determined based on the market value of the underlying interest rate swaps adjusted for credit spreads and recovery rates. Derivative instruments not designated as hedges outstanding as of the periods indicated below were as follows (dollars in thousands): March 31, 2024 Weighted Average Notional Fair Maturity Classification Amounts Value Fixed Rate Floating Rate (Years) Interest rate swaps: Financial institutions Other assets $ 103,805 $ 7,011 8856 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.26 Financial institutions Other assets 4,880 359 -8856 4.99% U.S. Prime 3.71 Customers Other liabilities 4,880 (359) 2 4.99% U.S. Prime 3.71 Customers Other liabilities 103,805 (7,011) 25 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.26 Credit risk participation agreements: Financial institutions Other assets $ 20,557 $ 13 3.50% - 5.40% SOFR CME 1M + 2.50% 7.07 December 31, 2023 Weighted Average Notional Fair Maturity Classification Amounts Value Fixed Rate Floating Rate (Years) Interest rate swaps: Financial institutions Other assets $ 104,930 $ 6,367 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.51 Financial institutions Other assets 4,911 295 4.99% U.S. Prime 3.96 Customers Other assets 4,875 30 6.25% SOFR CME 1M + 2.50% 4.04 Financial institutions Other liabilities 4,875 (30) 6.25% SOFR CME 1M + 2.50% 4.04 Customers Other liabilities 4,911 (295) 4.99% U.S. Prime 3.96 Customers Other liabilities 104,930 (6,367) 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.51 Credit risk participation agreements: Financial institutions Other assets $ 20,758 $ 20 3.50% - 5.40% SOFR CME 1M + 2.50% 7.33

BORROWINGS AND BORROWING CAPACI

BORROWINGS AND BORROWING CAPACITY	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
BORROWINGS AND BORROWING CAPACITY	BORROWINGS AND BORROWING CAPACITY The Company has an available line of credit with the Federal Home Loan Bank (“FHLB”) of Dallas, which allows the Company to borrow on a collateralized basis. FHLB advances are used to manage liquidity as needed. The advances are secured by a blanket lien on certain loans. Maturing advances are replaced by drawing on available cash, making additional borrowings or through increased customer deposits. At March 31, 2024, the Company had a total borrowing capacity of $3.52 billion, of which $2.14 billion was available under this agreement and $1.38 billion was outstanding pursuant to FHLB advances and letters of credit. There were $215.0 million of FHLB short-term advances outstanding at March 31, 2024 at a weighted-average rate of 5.60%. Letters of credit were $1.17 billion at March 31, 2024 and will expire in the following periods (in thousands): 2024 $ 310,280 2025 296,200 2026 57,300 2027 402,500 Thereafter 100,000 Total $ 1,166,280 On December 13, 2022, the Company entered into a loan agreement with another financial institution, or the (“Loan Agreement”) that provides for a $75.0 million revolving line of credit. At March 31, 2024, there were no outstanding borrowings on this line of credit and the Company did not draw on this line of credit during 2024 or 2023. The Company can make draws on the line of credit for a period of 24 months, which began on Decemb er 13, 2 022, after which the Company will not be permitted to make further draws and the outstanding balance will amortize over a period of 60 months. Interest accrues on outstanding borrowings at a per annum rate equal to the prime rate quoted by The Wall Street Journal and with a floor rate of 3.50% calculated in accordance with the terms of the revolving promissory note and payable quarterly through the first 24 months. The entire outstanding balance and unpaid interest is payable in full on December 13, 2024. The Company may prepay the principal amount of the line of credit without premium or penalty. The obligations of the Company under the Loan Agreement are secured by a pledge of all the issued and outstanding shares of capital stock of Stellar Bank. Covenants made under the Loan Agreement include, among other things, while there are obligations outstanding under Loan Agreement, the Company shall maintain a cash flow to debt service (as defined in the Loan Agreement) of not less than 1.25, the Bank’s Texas Ratio (as defined in the Loan Agreement) not to exceed 25.0% and the Bank shall maintain a Tier 1 Leverage Ratio (as defined under the Loan Agreement) of at least 7.0% and restrictions on the ability of the Company and its subsidiaries to incur certain additional debt. As of March 31, 2024, the Company believes it was in compliance with all such debt covenants and had not been made aware of any noncompliance by the lender.

SUBORDINATED DEBT

SUBORDINATED DEBT	3 Months Ended
	Mar. 31, 2024
Subordinated Borrowings [Abstract]
SUBORDINATED DEBT	SUBORDINATED DEBT Junior Subordinated Debentures In connection with the acquisitio n of F&M Bancshares, Inc. in 2015, the Company assumed Farmers & Merchants Capital Trust II and Farmers & Merchants Capital Trust III. Each of the trusts is a capital or statutory business trust organized for the sole purpose of issuing trust securities and investing the proceeds in the Company’s junior subordinated debentures. The preferred trust securities of each trust represent preferred beneficial interests in the assets of the respective trusts and are subject to mandatory redemption upon payment of the junior subordinated debentures held by the trust. The common securities of each trust are wholly owned by the Company. Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon the Company making payment on the related junior subordinated debentures. The debentures, which are the only assets of each trust, are subordinate and junior in right of payment to all of the Company’s present and future senior indebtedness. The Company has fully and unconditionally guaranteed each trust’s obligations under the trust securities issued by each trust to the extent not paid or made by such trust, provided such trust has funds available for such obligations. The trust preferred securities bear a floating rate of interest equal to 3-Month SOFR plus a spread adjustment. The junior subordinated debentures are included in Tier 1 capital under current regulatory guidelines and interpretations. Under the provisions of each issue of the debentures, the Company has the right to defer payment of interest on the debentures at any time, or from time to time, for periods not exceeding five years. If interest payments on either issue of the debentures are deferred, the distributions on the applicable trust preferred securities and common securities will also be deferred. A summary of pertinent information related to the Company’s junior subordinated debentures outstanding at March 31, 2024 is set forth in the table below: Description Issuance Date Trust Preferred Securities Outstanding Junior Subordinated Debt Owed to Trusts Maturity Date (1) (Dollars in thousands) Farmers & Merchants Capital Trust II November 13, 2003 $ 7,500 $ 7,732 November 8, 2033 Farmers & Merchants Capital Trust III June 30, 2005 3,500 3,609 July 7, 2035 $ 11,341 (1) All junior subordinated debentures were callable at March 31, 2024. Subordinated Notes In December 2017, the Bank issued $40.0 million aggregate principal amount of Fixed-to-Floating Rate Subordinated Notes (the “Bank Notes”) due December 15, 2027. The Bank Notes bear a floating rate of interest equal to 3-Month SOFR plus a spread adjustment until the Bank Notes mature on December 15, 2027, or such earlier redemption date, payable quarterly in arrears. The Bank Notes are redeemable by the Bank, in whole or in part or in whole but not in part, upon the occurrence of certain specified tax events, capital events or investment company events. Any redemption will be at a redemption price equal to 100% of the principal amount of Bank Notes being redeemed, plus accrued and unpaid interest, and will be subject to, and require, prior regulatory approval. The Bank Notes are not subject to redemption at the option of the holders. The Bank Notes are eligible for Tier 2 capital treatment, however, during the last five years of the instrument, the amount eligible must be reduced by 20% of the original amount annually and that no amount of the instrument is eligible for inclusion in Tier 2 capital when the remaining maturity of the instrument is less than one year. As the Bank Notes are within five years of maturity, only 60% of the notes are eligible for Tier 2 capital treatment at March 31, 2024. In September 2019, the Company issued $60.0 million aggregate principal amount of Fixed-to-Floating Rate Subordinated Notes (the “Company Notes”) due October 1, 2029. The Company Notes bear a fixed interest rate of 4.70% per annum until (but excluding) October 1, 2024, payable semi-annually in arrears on April 1 and October 1, commencing on April 1, 2020. Thereafter, from October 1, 2024 through the maturity date, October 1, 2029, or earlier redemption date, the Company Notes will bear interest at a floating rate equal to 3-Month SOFR, plus 3.13%, for each quarterly interest period, payable quarterly in arrears on January 1, April 1, July 1 and October 1 of each year. Any redemption will be at a redemption price equal to 100% of the principal amount of Company Notes being redeemed, plus accrued and unpaid interest, and will be subject to, and require, prior regulatory approval. The Company Notes are not subject to redemption at the option of the holders.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The amount of the Company’s income tax expense is influenced by the amount of pre-tax income, the amount of tax-exempt income and the amount of other nondeductible items. Three Months Ended March 31, 2024 March 31, 2023 Income tax expense $ 6,759 $ 9,913 Effective income tax rate 20.5 % 21.1 %

STOCK BASED COMPENSATION

STOCK BASED COMPENSATION	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
STOCK BASED COMPENSATION	STOCK BASED COMPENSATION Under the 2022 Omnibus Incentive Plan (the “2022 Plan”) the Company is authorized to issue a maximum aggregate of 2,000,000 shares of common stock. All restricted stock and performance share awards outstanding at March 31, 2024 were issued under the 2022 Plan. At March 31, 2024, there were 770,505 shares reserved and available for issuance under the 2022 Plan. The Company accounts for stock based employee compensation plans using the fair value-based method of accounting. The Company recognized total stock based compensation expense of $2.8 million and $2.6 million for the three months ended March 31, 2024 and 2023, respectively. Stock Options Stock options outstanding at March 31, 2024, were issued under equity compensation plans that are no longer active and no additional shares may be issued under these compensation plans. Stock option activity during the three months ended March 31, 2024 was as follows: Number of Weighted- Weighted- Aggregate (In thousands) (In years) (In thousands) Options outstanding, January 1, 2024 258 $ 18.56 2.09 $ 2,398 Options granted — — Options exercised (22) (14.68) Options forfeited (4) 14.11 Options outstanding, March 31, 2024 232 $ 19.01 2.02 $ 1,319 Options vested and exercisable, March 31, 2024 232 $ 19.01 2.02 $ 1,319 Restricted Stock Awards The fair value of the Company’s restricted stock awards is estimated based on the market value of the Company’s common stock at the date of grant, which is the closing price of the Company’s common stock on the day before the grant date. The shares of restricted stock granted during 2024 generally vest over a period of two Shares of restricted stock are considered outstanding at the date of issuance as the grantee becomes the record owner of the restricted stock and has voting, dividend and other shareholder rights. The shares of restricted stock are non-transferable and subject to forfeiture until the restricted stock awards vest and any dividends with respect to the restricted stock awards are subject to the same restrictions, including the risk of forfeiture. Nonvested shares of restricted stock activity during the three months ended March 31, 2024 was as follows: Number of Weighted- (In thousands) Nonvested share awards outstanding, January 1, 2024 458 $ 29.38 Share awards granted 263 23.31 Share awards vested (57) (25.99) Unvested share awards forfeited or cancelled (1) (25.99) Nonvested share awards outstanding, March 31, 2024 663 27.27 As of March 31, 2024, there was $16.1 million of unrecognized compensation expense related to restricted stock awards which is expected to be recognized over a weighted-average period of 2.04 years. Performance Share Awards ( “ PSAs ” ) PSAs are generally earned subject to certain performance goals being met after the two-year performance period and will be settled in shares of Company common stock following a one-year service period. There were 77,624 PSAs awarded during the three months ended March 31, 2024. The grant date fair value of the PSAs is based on the probable outcome of the applicable performance conditions and is calculated at target based on a combination of the closing market price of our common stock on the grant date and a Monte Carlo simulated fair value in accordance with ASC 718. At March 31, 2024, there was $2.2 million of unrecognized compensation expense related to the PSAs, which is expected to be recognized over a weighted-average period of 2.14 years.

OFF-BALANCE SHEET ARRANGEMENTS,

OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES	OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES In the normal course of business, the Company enters into various transactions, which, in accordance with accounting principles generally accepted in the United States are not included in the Company’s 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 and commercial 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 uses the same credit policies in making commitments and conditional obligations as it does for on balance sheet instruments. The contractual amounts of financial instruments with off-balance sheet risk are as follows: March 31, 2024 December 31, 2023 Fixed Variable Fixed Variable (In thousands) Commitments to extend credit $ 294,694 $ 1,251,493 $ 367,068 $ 1,425,946 Standby letters of credit 14,771 24,660 16,147 21,514 Total $ 309,465 $ 1,276,153 $ 383,215 $ 1,447,460 At March 31, 2024 and December 31, 2023, the Company had FHLB letters of credit in the amount of $1.17 billion and $1.82 billion, respectively, pledged as collateral for public and other deposits of state and local government agencies. For more information on FHLB borrowings, see Note 9 – Borrowings and Borrowing Capacity. Commitments to Extend Credit Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being fully drawn upon, the total commitment amounts disclosed do not necessarily represent future cash funding requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The Company minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures. Management assesses the credit risk associated with certain commitments to extend credit in determining the level of the allowance for credit losses. The amount and type of collateral, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the customer. Commitments to make loans are generally made for an approval period of 120 days or less. As of March 31, 2024, the fixed rate loan commitments had interest rates ranging from 1.80% to 13.50% with a weighted average maturity of 2.28 years and a weighted-average rate of 6.59%. Standby Letters of Credit Standby letters of credit are written conditional commitments issued by the Company to guarantee the performance of a customer to a third party. In the event of nonperformance by the customer, the Company has the rights to the underlying collateral. The credit risk to the Company in issuing letters of credit is substantially similar to that involved in extending loan facilities to its customers. The Company’s policy for obtaining collateral, and the nature of such collateral, is substantially similar to that involved in making commitments to extend credit. Litigation

REGULATORY CAPITAL MATTERS

REGULATORY CAPITAL MATTERS	3 Months Ended
	Mar. 31, 2024
Regulatory Capital Matters [Abstract]
REGULATORY CAPITAL MATTERS	REGULATORY CAPITAL MATTERS The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Capital adequacy guidelines, and for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities and certain off balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk weightings and other factors. Failure to meet minimum capital requirements can initiate actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Management believes as of March 31, 2024 and December 31, 2023, the Company and the Bank met all capital adequacy requirements to which they were then subject. Prompt corrective action regulations provide five classifications: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If less than well capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. Based on the ratios presented below, the Company’s and the Bank’s capital ratios as of March 31, 2024 exceed the minimum levels necessary to be considered “well-capitalized” under the prompt corrective action regulatory framework. The following is a summary of the Company’s and the Bank’s actual and required capital ratios as of March 31, 2024 and December 31, 2023: Actual Minimum Required for Capital Adequacy Purposes Minimum Required Plus Capital Conservation Buffer To Be Categorized As Well-Capitalized Under Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) STELLAR BANCORP, INC. (Consolidated) March 31, 2024 Total Capital (to risk-weighted assets) $ 1,252,365 14.62 % $ 685,412 8.00 % $ 899,603 10.50 % N/A N/A Common Equity Tier 1 Capital (to risk-weighted assets) 1,053,055 12.29 % 385,544 4.50 % 599,735 7.00 % N/A N/A Tier 1 Capital (to risk-weighted assets) 1,062,953 12.41 % 514,059 6.00 % 728,250 8.50 % N/A N/A Tier 1 Leverage (to average tangible assets) 1,062,953 10.41 % 408,273 4.00 % 408,273 4.00 % N/A N/A December 31, 2023 Total Capital (to risk-weighted assets) $ 1,221,060 14.02 % $ 696,529 8.00 % $ 914,195 10.50 % N/A N/A Common Equity Tier 1 Capital (to risk-weighted assets) 1,025,076 11.77 % 391,798 4.50 % 604,463 7.00 % N/A N/A Tier 1 Capital (to risk-weighted assets) 1,034,974 11.89 % 522,397 6.00 % 740,062 8.50 % N/A N/A Tier 1 Leverage (to average tangible assets) 1,034,974 10.18 % 406,859 4.00 % 406,859 4.00 % N/A N/A STELLAR BANK March 31, 2024 Total Capital (to risk-weighted assets) $ 1,208,772 14.13 % $ 684,604 8.00 % $ 898,542 10.50 % $ 855,755 10.00 % Common Equity Tier 1 Capital (to risk-weighted assets) 1,079,360 12.61 % 385,090 4.50 % 599,028 7.00 % 556,240 6.50 % Tier 1 Capital (to risk-weighted assets) 1,079,360 12.61 % 513,453 6.00 % 727,391 8.50 % 684,604 8.00 % Tier 1 Leverage (to average tangible assets) 1,079,360 10.59 % 407,853 4.00 % 407,853 4.00 % 509,816 5.00 % December 31, 2023 Total Capital (to risk-weighted assets) $ 1,186,710 13.65 % $ 695,746 8.00 % $ 913,167 10.50 % $ 869,683 10.00 % Common Equity Tier 1 Capital (to risk-weighted assets) 1,060,624 12.20 % 391,357 4.50 % 608,778 7.00 % 565,294 6.50 % Tier 1 Capital (to risk-weighted assets) 1,060,624 12.20 % 521,810 6.00 % 739,231 8.50 % 695,746 8.00 % Tier 1 Leverage (to average tangible assets) 1,060,624 10.44 % 406,453 4.00 % 406,453 4.00 % 508,066 5.00 % Dividend Restrictions The Company’s principal source of funds for dividend payments is dividends received from the Bank. Banking regulations limit the amount of dividends that may be paid without prior approval of regulatory agencies. In addition, the Company’s credit agreement with another financial institution also limits its ability to pay dividends. Under applicable banking regulations, the amount of dividends that may be paid by the Bank in any calendar year is limited to the current year’s net profits combined with the retained net profits of the preceding two years, subject to the capital requirements described above.

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
EARNINGS PER COMMON SHARE	EARNINGS PER COMMON SHARE Diluted earnings per common share is computed using the weighted-average number of common shares determined for the basic earnings per common share computation plus the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock using the treasury stock method. Outstanding stock options issued by the Company represent the only dilutive effect reflected in diluted weighted average shares. Restricted shares and performance share awards are considered outstanding at the date of grant, accounted for as participating securities and included in basic and diluted weighted average common shares outstanding. Three Months Ended March 31, 2024 2023 Amount Per Share Amount Per Share (Amounts in thousands, except per share data) Net income attributable to shareholders $ 26,147 $ 37,148 Basic: Weighted average shares outstanding 53,343 $ 0.49 53,021 $ 0.70 Diluted: Add incremental shares for: Dilutive effect of stock option exercises and performance share units 63 117 Total 53,406 $ 0.49 53,138 $ 0.70

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net income	$ 26,147	$ 37,148

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Ramon A. Vitulli III [Member]
Trading Arrangements, by Individual
Name	Ramon A. Vitulli III
Title	President of Stellar Bancorp, Inc.
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 8, 2024
Termination Date	December 31, 2024
Arrangement Duration	298 days
Aggregate Available	9,000

NATURE OF OPERATIONS AND SUMM_2

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation —The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in accordance with guidance provided by the Securities and Exchange Commission (“SEC”). Accordingly, the condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments considered 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. Transactions between Stellar and the Bank have been eliminated. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023. Operating results for the three months ended March 31, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024.
Reclassification	Reclassification s —Certain items in the prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or shareholders’ equity.
Recent Accounting Standards	Recent Accounting Standards Accounting Standards Update ( “ ASU ” ) 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	Changes in the carrying amount of the Company’s goodwill and core deposit intangible assets were as follows: Goodwill Core Deposit Servicing Assets (In thousands) Balance as of December 31, 2022 $ 497,260 $ 143,525 $ 309 Amortization — (26,813) (70) Goodwill true-up 58 — — Decrease due to payoff of serviced loans — — (27) Balance as of December 31, 2023 497,318 116,712 212 Amortization — (6,199) (13) Balance as of March 31, 2024 $ 497,318 $ 110,513 $ 199
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The estimated aggregate future amortization expense for core deposit intangible assets remaining as of March 31, 2024 is as follows (in thousands): Remaining 2024 $ 17,967 2025 21,528 2026 18,896 2027 16,272 Thereafter 35,850 Total $ 110,513

SECURITIES (Tables)

SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	The amortized cost and fair value of securities available for sale were as follows: March 31, 2024 Amortized Gross Gross Fair (In thousands) Available for Sale U.S. government and agency securities $ 299,366 $ 69 $ (10,070) $ 289,365 Municipal securities 222,809 1,166 (27,227) 196,748 Agency mortgage-backed pass-through securities 454,639 39 (42,673) 412,005 Agency collateralized mortgage obligations 593,435 185 (72,751) 520,869 Corporate bonds and other 117,631 34 (13,552) 104,113 Total $ 1,687,880 $ 1,493 $ (166,273) $ 1,523,100 December 31, 2023 Amortized Gross Gross Fair (In thousands) Available for Sale U.S. government and agency securities $ 307,529 $ 90 $ (10,201) $ 297,418 Municipal securities 229,615 1,615 (27,171) 204,059 Agency mortgage-backed pass-through securities 424,664 370 (37,161) 387,873 Agency collateralized mortgage obligations 462,498 172 (64,553) 398,117 Corporate bonds and other 120,824 56 (12,667) 108,213 Total $ 1,545,130 $ 2,303 $ (151,753) $ 1,395,680
Investments Classified by Contractual Maturity Date	The amortized cost and fair value of investment securities at March 31, 2024, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations at any time with or without call or prepayment penalties. Amortized Fair (In thousands) Due in one year or less $ 76,060 $ 74,067 Due after one year through five years 83,030 78,334 Due after five years through ten years 137,346 121,106 Due after ten years 343,370 316,719 Subtotal 639,806 590,226 Agency mortgage-backed pass-through securities and collateralized mortgage obligations 1,048,074 932,874 Total $ 1,687,880 $ 1,523,100
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	Securities with unrealized losses segregated by length of time in a continuous loss position were as follows: March 31, 2024 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (In thousands) Available for Sale U.S. government and agency securities $ 35,927 $ (628) $ 229,325 $ (9,442) $ 265,252 $ (10,070) Municipal securities 2,159 (16) 172,364 (27,211) 174,523 (27,227) Agency mortgage-backed pass-through securities 104,502 (2,385) 284,000 (40,288) 388,502 (42,673) Agency collateralized mortgage obligations 119,120 (2,905) 335,294 (69,846) 454,414 (72,751) Corporate bonds and other 7,101 (2,637) 89,893 (10,915) 96,994 (13,552) Total $ 268,809 $ (8,571) $ 1,110,876 $ (157,702) $ 1,379,685 $ (166,273) December 31, 2023 Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (In thousands) Available for Sale U.S. government and agency securities $ 110,038 $ (2,208) $ 154,145 $ (7,993) $ 264,183 $ (10,201) Municipal securities 1,303 (14) 177,957 (27,157) 179,260 (27,171) Agency mortgage-backed pass-through securities 80,208 (1,444) 257,779 (35,717) 337,987 (37,161) Agency collateralized mortgage obligations 23,051 (621) 348,854 (63,932) 371,905 (64,553) Corporate bonds and other 11,279 (1,452) 85,285 (11,215) 96,564 (12,667) Total $ 225,879 $ (5,739) $ 1,024,020 $ (146,014) $ 1,249,899 $ (151,753)

LOANS AND ALLOWANCE FOR CREDI_2

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The loan portfolio balances, net of unearned income and fees, consist of various types of loans primarily made to borrowers located within Texas and segregated by class of loan were as follows: March 31, 2024 December 31, 2023 (In thousands) Commercial and industrial $ 1,451,462 $ 1,409,002 Paycheck Protection Program (PPP) 4,293 5,100 Real estate: Commercial real estate (including multi-family residential) 4,049,885 4,071,807 Commercial real estate construction and land development 1,039,443 1,060,406 1-4 family residential (including home equity) 1,049,316 1,047,174 Residential construction 252,573 267,357 Consumer and other 61,139 64,287 Total loans 7,908,111 7,925,133 Allowance for credit losses on loans (96,285) (91,684) Loans, net $ 7,811,826 $ 7,833,449
Past Due Financing Receivables	An aging analysis of the recorded investment in past due loans, segregated by class of loans, is included below. The Company defines recorded investment as the outstanding loan balances including net deferred loan fees, and excluding accrued interest receivable of $37.9 million and $37.4 million as of March 31, 2024 and December 31, 2023, respectively, due to immateriality. March 31, 2024 Loans Past Due and Still Accruing Nonaccrual Current Total 30-89 90 or More Total Past (In thousands) Commercial and industrial $ 7,137 $ — $ 7,137 $ 15,465 $ 1,428,860 $ 1,451,462 Paycheck Protection Program (PPP) 81 — 81 — 4,212 4,293 Real estate: Commercial real estate (including multi-family residential) 13,498 — 13,498 21,268 4,015,119 4,049,885 Commercial real estate construction and land development 4,345 — 4,345 8,406 1,026,692 1,039,443 1-4 family residential (including home equity) 6,170 — 6,170 10,368 1,032,778 1,049,316 Residential construction 575 — 575 1,410 250,588 252,573 Consumer and other 11 — 11 212 60,916 61,139 Total loans $ 31,817 $ — $ 31,817 $ 57,129 $ 7,819,165 $ 7,908,111 December 31, 2023 Loans Past Due and Still Accruing Nonaccrual Current Total 30-89 90 or More Total Past (In thousands) Commercial and industrial $ 6,096 $ — $ 6,096 $ 5,048 $ 1,397,858 $ 1,409,002 Paycheck Protection Program (PPP) 375 — 375 — 4,725 5,100 Real estate: Commercial real estate (including multi-family residential) 9,600 — 9,600 16,699 4,045,508 4,071,807 Commercial real estate construction and land development 7,341 — 7,341 5,043 1,048,022 1,060,406 1-4 family residential (including home equity) 3,492 — 3,492 8,874 1,034,808 1,047,174 Residential construction 498 — 498 3,288 263,571 267,357 Consumer and other 64 — 64 239 63,984 64,287 Total loans $ 27,466 $ — $ 27,466 $ 39,191 $ 7,858,476 $ 7,925,133
Financing Receivable Credit Quality Indicators	The following table presents risk ratings by category and the gross charge-offs by primary loan type and year of origination or renewal. Generally, current period renewals of credit are re-underwritten at the point of renewal and considered current period originations for purposes of the table below. The following summarizes the amortized cost basis of loans by year of origination/renewal and credit quality indicator by class of loan as of March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Revolving Loans Total Total 2024 2023 2022 2021 2020 Prior (In thousands) Commercial and industrial Pass $ 107,787 $ 292,611 $ 217,128 $ 153,240 $ 35,742 $ 34,744 $ 533,879 $ 33,792 $ 1,408,923 $ 1,377,118 Special Mention — 115 2,270 589 66 325 3,459 1,460 8,284 8,340 Substandard 71 2,374 4,082 968 559 12,585 11,637 1,932 34,208 23,496 Doubtful — 47 — — — — — — 47 48 Total commercial and industrial loans $ 107,858 $ 295,147 $ 223,480 $ 154,797 $ 36,367 $ 47,654 $ 548,975 $ 37,184 $ 1,451,462 $ 1,409,002 Current period gross charge-offs $ — $ — $ 30 $ 85 $ 144 $ — $ 50 $ — $ 309 Paycheck Protection Program (PPP) Pass $ — $ — $ — $ 2,347 $ 1,946 $ — $ — $ — $ 4,293 $ 5,100 Special Mention — — — — — — — — — — Substandard — — — — — — — — — — Doubtful — — — — — — — — — — Total PPP loans $ — $ — $ — $ 2,347 $ 1,946 $ — $ — $ — $ 4,293 $ 5,100 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate (including multi-family residential) Pass $ 96,235 $ 425,893 $ 1,309,676 $ 834,247 $ 417,006 $ 689,186 $ 116,365 $ 20,128 $ 3,908,736 $ 3,959,675 Special Mention 2,745 10,358 11,822 15,343 20,377 7,840 2,659 485 71,629 54,483 Substandard 2,193 9,507 11,559 22,828 7,956 14,991 386 100 69,520 57,649 Doubtful — — — — — — — — — — Total commercial real estate (including multi-family residential) loans $ 101,173 $ 445,758 $ 1,333,057 $ 872,418 $ 445,339 $ 712,017 $ 119,410 $ 20,713 $ 4,049,885 $ 4,071,807 Current period gross charge-offs $ — $ — $ — $ 527 $ — $ — $ — $ — $ 527 Commercial real estate construction and land development Pass $ 78,696 $ 273,479 $ 443,705 $ 105,452 $ 24,665 $ 14,684 $ 61,296 $ 2,772 $ 1,004,749 $ 1,032,789 Special Mention 1,994 1,140 7,801 237 — 478 — — 11,650 9,737 Substandard — 3,280 1,601 17,316 74 79 370 324 23,044 17,880 Doubtful — — — — — — — — — — Total commercial real estate construction and land development $ 80,690 $ 277,899 $ 453,107 $ 123,005 $ 24,739 $ 15,241 $ 61,666 $ 3,096 $ 1,039,443 $ 1,060,406 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — March 31, 2024 December 31, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Revolving Loans 2024 2023 2022 2021 2020 Prior Total Total (In thousands) 1-4 family residential (including Pass $ 30,500 $ 157,208 $ 266,182 $ 210,530 $ 107,684 $ 137,325 $ 91,132 $ 11,046 $ 1,011,607 $ 1,011,743 Special Mention 173 977 850 1,470 1,816 1,063 — 175 6,524 5,384 Substandard 1,587 1,956 1,419 3,480 2,092 10,722 8,226 1,703 31,185 30,047 Doubtful — — — — — — — — — — Total 1-4 family residential (including home equity) $ 32,260 $ 160,141 $ 268,451 $ 215,480 $ 111,592 $ 149,110 $ 99,358 $ 12,924 $ 1,049,316 $ 1,047,174 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential construction Pass $ 39,851 $ 123,542 $ 74,617 $ 6,142 $ 2,437 $ 489 $ 1,156 $ — $ 248,234 $ 264,069 Special Mention — — — 365 — — — — 365 — Substandard — 3,974 — — — — — — 3,974 3,288 Doubtful — — — — — — — — — — Total residential construction $ 39,851 $ 127,516 $ 74,617 $ 6,507 $ 2,437 $ 489 $ 1,156 $ — $ 252,573 $ 267,357 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Consumer and other Pass $ 14,060 $ 19,415 $ 7,010 $ 2,799 $ 1,673 $ 646 $ 14,663 $ 481 $ 60,747 $ 63,881 Special Mention — — 18 — — — — — 18 67 Substandard — — 110 102 — 10 2 150 374 339 Doubtful — — — — — — — — — — Total consumer and other $ 14,060 $ 19,415 $ 7,138 $ 2,901 $ 1,673 $ 656 $ 14,665 $ 631 $ 61,139 $ 64,287 Current period gross charge-offs $ — $ 5 $ — $ — $ — $ — $ — $ 5 Total loans Pass $ 367,129 $ 1,292,148 $ 2,318,318 $ 1,314,757 $ 591,153 $ 877,074 $ 818,491 $ 68,219 $ 7,647,289 $ 7,714,375 Special Mention 4,912 12,590 22,761 18,004 22,259 9,706 6,118 2,120 98,470 78,011 Substandard 3,851 21,091 18,771 44,694 10,681 38,387 20,621 4,209 162,305 132,699 Doubtful — 47 — — — — — — 47 48 Total loans $ 375,892 $ 1,325,876 $ 2,359,850 $ 1,377,455 $ 624,093 $ 925,167 $ 845,230 $ 74,548 $ 7,908,111 $ 7,925,133 Current period gross charge-offs $ — $ 5 $ 30 $ 612 $ 144 $ — $ 50 $ — $ 841
Allowance for Credit Losses on Financing Receivables	The following table presents the activity in the allowance for credit losses on loans by portfolio type for the three months ended March 31, 2024 and 2023: Commercial and industrial Paycheck Protection Program (PPP) Commercial real estate (including multi-family residential) Commercial real estate construction and land development 1-4 family residential (including home equity) Residential construction Consumer and other Total (In thousands) Allowance for credit losses on loans: Three Months Ended Balance December 31, 2023 $ 31,979 $ — $ 38,187 $ 13,627 $ 4,785 $ 2,623 $ 483 $ 91,684 Provision for credit losses on loans 5,667 (1,049) 425 265 72 (65) 5,315 Charge-offs (309) — (527) — — — (5) (841) Recoveries 114 — — — 5 — 8 127 Net charge-offs (195) — (527) — 5 — 3 (714) Balance March 31, 2024 $ 37,451 $ — $ 36,611 $ 14,052 $ 5,055 $ 2,695 $ 421 $ 96,285 Three Months Ended Balance December 31, 2022 $ 41,236 $ — $ 32,970 $ 14,121 $ 2,709 $ 1,796 $ 348 $ 93,180 Provision for credit losses on loans (1,502) — 4,716 (542) 116 293 119 3,200 Charge-offs (426) — — — — — (8) (434) Recoveries 208 — 14 — 7 — 13 242 Net charge-offs (218) — 14 — 7 — 5 (192) Balance March 31, 2023 $ 39,516 $ — $ 37,700 $ 13,579 $ 2,832 $ 2,089 $ 472 $ 96,188
Summary of Amortized Cost Basis of Collateral Dependent Loans Individually Evaluated to Determine Expected Credit Losses	The following tables present the amortized cost basis of collateral dependent loans, which are individually evaluated to determine expected credit losses as of March 31, 2024 and December 31, 2023: March 31, 2024 Real Estate Business Assets Other Total (In thousands) Commercial and industrial $ — $ 18 $ — $ 18 Real estate: Commercial real estate (including multi-family residential) 7,410 — — 7,410 Commercial real estate construction and land development 1,179 — — 1,179 1-4 family residential (including home equity) 620 — — 620 Residential construction — — — — Consumer and other — — — — Total $ 9,209 $ 18 $ — $ 9,227 December 31, 2023 Real Estate Business Assets Other Total (In thousands) Commercial and industrial $ — $ 70 $ — $ 70 Real estate: Commercial real estate (including multi-family residential) 5,548 — — 5,548 Commercial real estate construction and land development 437 — — 437 1-4 family residential (including home equity) 424 — — 424 Residential construction — — — — Consumer and other — — — — Total $ 6,409 $ 70 $ — $ 6,479
Summary of Nonaccrual Loans	The following tables present additional information regarding nonaccrual loans. No interest income was recognized on nonaccrual loans as of March 31, 2024 and December 31, 2023. March 31, 2024 Nonaccrual Loans with No Related Allowance Nonaccrual Loans with Related Allowance Total Nonaccrual Loans (In thousands) Commercial and industrial $ 1,073 $ 14,392 $ 15,465 Paycheck Protection Program (PPP) — — — Real estate: Commercial real estate (including multi-family residential) 15,905 5,363 21,268 Commercial real estate construction and land development 7,664 742 8,406 1-4 family residential (including home equity) 7,310 3,058 10,368 Residential construction — 1,410 1,410 Consumer and other 32 180 212 Total loans $ 31,984 $ 25,145 $ 57,129 December 31, 2023 Nonaccrual Loans with No Related Allowance Nonaccrual Loans with Related Allowance Total Nonaccrual Loans (In thousands) Commercial and industrial $ 1,616 $ 3,432 $ 5,048 Paycheck Protection Program (PPP) — — — Real estate: Commercial real estate (including multi-family residential) 11,844 4,855 16,699 Commercial real estate construction and land development 5,043 — 5,043 1-4 family residential (including home equity) 7,400 1,474 8,874 Residential construction 3,288 — 3,288 Consumer and other 54 185 239 Total loans $ 29,245 $ 9,946 $ 39,191
Troubled Debt Restructurings on Financing Receivables	The following tables present information regarding loans that were modified due to the borrowers experiencing financial difficulty during the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 Interest Rate Reduction Term Extension Payment Delay Principal forgiveness Combination Term Extension and Principal Forgiveness Combination Term Extension and Payment Delay Total (In thousands) Commercial and industrial $ — $ 1,059 $ 814 $ — $ — $ 468 $ 2,341 Real estate: Commercial real estate (including multi-family residential) — — 1,800 — — — 1,800 Commercial real estate construction and land development — 2,097 — — — 1,944 4,041 1-4 family residential (including home equity) — — 657 — — — 657 Residential construction — 55 1,173 — — 237 1,465 Consumer and other — — — — — — — Total $ — $ 3,211 $ 4,444 $ — $ — $ 2,649 $ 10,304 Three Months Ended March 31, 2023 Interest Rate Reduction Term Extension Payment Delay Principal forgiveness Combination Term Extension and Principal Forgiveness Combination Term Extension and Payment Delay Total (In thousands) Commercial and industrial $ 96 $ 2,251 $ — $ — $ — $ — $ 2,347 Real estate: Commercial real estate (including multi-family residential) — 798 — — — 798 Commercial real estate construction and land development — — — — — — — 1-4 family residential (including home equity) — 725 — — — — 725 Residential construction — — — — — — — Consumer and other — — — — — — — Total $ 96 $ 3,774 $ — $ — $ — $ — $ 3,870 The following table summarizes, by loan portfolio, the financial effect of the Company's loan modifications for the periods indicated: Three Months Ended March 31, 2024 Three Months Ended March 31, 2023 Weighted-Average Interest Rate Reduction Weighted-Average Term Extension Weighted-Average Interest Rate Reduction Weighted-Average Term Extension (months) (months) Commercial and industrial — % 4 — % 29 Real estate: Commercial real estate (including multi-family residential) — % — — % 6 Commercial real estate construction and land development — % 5 — % — 1-4 family residential (including home equity) — % — — % 12 Residential construction — % 6 — % — Consumer and other — % — — % — The following table summarizes modified loans that had a payment default during the twelve months ended March 31, 2024: Term Extension Payment Delay Combination Term Extension and Payment Delay (In thousands) Commercial and industrial $ 142 $ — $ — Real estate: Commercial real estate (including multi-family residential) — — — Commercial real estate construction and land development 1,727 — — 1-4 family residential (including home equity) — — 69 Residential construction — 1,173 — Consumer and other 92 — — $ 1,961 $ 1,173 $ 69

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Supplemental Lease Information	Supplemental lease information at the dates indicated was as follows: March 31, 2024 December 31, 2023 (Dollars in thousands) Balance Sheet: Operating lease right-of-use asset classified as premises and equipment $ 19,193 $ 20,746 Operating lease liability classified as other liabilities $ 19,658 $ 20,659 Weighted average lease term, in years 7.63 7.67 Weighted average discount rate 4.21 % 4.17 %
Summary of Lease Costs	Lease costs for the dates indicated was as follows: Three Months Ended March 31, 2024 2023 (In thousands) Income Statement: Operating lease cost $ 1,943 $ 1,809 Short-term lease cost 6 5 Total operating lease costs $ 1,949 $ 1,814
Maturity Analysis of Lease Liabilities	The following table summarizes the contractual maturity of the Company’s lease liabilities as of the dates indicated below: March 31, 2024 December 31, 2023 (In thousands) Lease payments due: Within one year $ 3,281 $ 4,428 After one but within two years 4,191 3,978 After two but within three years 3,667 3,430 After three but within four years 3,469 3,227 After four but within five years 3,294 3,047 After five years 6,815 6,605 Total lease payments 24,717 24,715 Less: discount on cash flows (5,059) (4,056) Total lease liability $ 19,658 $ 20,659

FAIR VALUE (Tables)

FAIR VALUE (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The carrying amounts and estimated fair values of financial instruments that are reported on the balance sheet were as follows: March 31, 2024 Carrying Estimated Fair Value Level 1 Level 2 Level 3 Total (In thousands) Financial assets Cash and cash equivalents $ 399,742 $ 399,742 $ — $ — $ 399,742 Available for sale securities 1,523,100 — 1,523,100 — 1,523,100 Loans held for investment, net of allowance 7,811,826 — — 7,583,625 7,583,625 Accrued interest receivable 45,466 297 7,286 37,883 45,466 Financial liabilities Deposits $ 8,794,716 $ — $ 8,788,761 $ — $ 8,788,761 Accrued interest payable 12,227 — 12,227 — 12,227 Borrowed funds 215,000 — 215,000 — 215,000 Subordinated debt 109,864 — 108,739 — 108,739 December 31, 2023 Carrying Estimated Fair Value Level 1 Level 2 Level 3 Total (In thousands) Financial assets Cash and cash equivalents $ 399,237 $ 399,237 $ — $ — $ 399,237 Available for sale securities 1,395,680 — 1,395,680 — 1,395,680 Loans held for investment, net of allowance 7,833,449 — — 7,627,962 7,627,962 Accrued interest receivable 44,244 118 6,716 37,410 44,244 Financial liabilities Deposits $ 8,873,467 $ — $ 8,866,645 $ — $ 8,866,645 Accrued interest payable 11,288 — 11,288 — 11,288 Borrowed funds 50,000 — 50,000 — 50,000 Subordinated debt 109,765 — 109,390 — 109,390
Schedule of 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. March 31, 2024 Level 1 Level 2 Level 3 Total (In thousands) Financial assets Available for sale securities: U.S. government and agency securities $ — $ 289,365 $ — $ 289,365 Municipal securities — 196,748 — 196,748 Agency mortgage-backed pass-through securities — 412,005 — 412,005 Agency collateralized mortgage obligations — 520,869 — 520,869 Corporate bonds and other — 104,113 — 104,113 Interest rate swaps — 7,370 — 7,370 Credit risk participation agreements — — 13 13 Total fair value of financial assets $ — $ 1,530,470 $ 13 $ 1,530,483 Financial liabilities Interest rate swaps $ — $ 7,370 $ — $ 7,370 Total fair value of financial liabilities $ — $ 7,370 $ — $ 7,370 December 31, 2023 Level 1 Level 2 Level 3 Total (In thousands) Financial assets Available for sale securities: U.S. government and agency securities $ — $ 297,418 $ — $ 297,418 Municipal securities — 204,059 — 204,059 Agency mortgage-backed pass-through securities — 387,873 — 387,873 Agency collateralized mortgage obligations — 398,117 — 398,117 Corporate bonds and other — 108,213 — 108,213 Interest rate swaps — 6,692 — 6,692 Credit risk participation agreements — — 20 20 Total fair value of financial assets $ — $ 1,402,372 $ 20 $ 1,402,392 Financial liabilities Interest rate swaps $ — $ 6,692 $ — $ 6,692 Total fair value of financial liabilities $ — $ 6,692 $ — $ 6,692
Fair Value Measurements, Nonrecurring	There were no liabilities measured at fair value on a nonrecurring basis at March 31, 2024 and December 31, 2023. Assets measured on a nonrecurring basis for the periods noted are summarized in the table below. March 31, 2024 Level 1 Level 2 Level 3 (In thousands) Loans: Commercial and industrial $ — $ — $ 18,691 Commercial real estate (including multi-family residential) — — 7,373 Commercial real estate construction and land development — — 8,708 1-4 family residential (including home equity) — — 4,997 Residential construction — — 1,192 Consumer and other — — 85 $ — $ — $ 41,046 December 31, 2023 Level 1 Level 2 Level 3 (In thousands) Loans: Commercial and industrial $ — $ — $ 10,084 Commercial real estate (including multi-family residential) — — 7,134 Commercial real estate construction and land development — — 6,654 1-4 family residential (including home equity) — — 3,892 Consumer and other — — 106 Branch assets held for sale (1) 2,033 — — $ 2,033 $ — $ 27,870 (1) Branch assets held for sale are banking centers that have closed and are for sale.

DEPOSITS (Tables)

DEPOSITS (Tables)	3 Months Ended
	Mar. 31, 2024
Deposit Liabilities [Abstract]
Schedule of Maturities of Time Deposits	Scheduled maturities of time deposits for the next five years are as follows (in thousands): Within one year $ 1,538,006 After one but within two years 60,069 Over three years 93,464 Total $ 1,691,539

DERIVATIVE INSTRUMENTS (Tables)

DERIVATIVE INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives Not Designated as Hedging Instruments	Derivative instruments not designated as hedges outstanding as of the periods indicated below were as follows (dollars in thousands): March 31, 2024 Weighted Average Notional Fair Maturity Classification Amounts Value Fixed Rate Floating Rate (Years) Interest rate swaps: Financial institutions Other assets $ 103,805 $ 7,011 8856 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.26 Financial institutions Other assets 4,880 359 -8856 4.99% U.S. Prime 3.71 Customers Other liabilities 4,880 (359) 2 4.99% U.S. Prime 3.71 Customers Other liabilities 103,805 (7,011) 25 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.26 Credit risk participation agreements: Financial institutions Other assets $ 20,557 $ 13 3.50% - 5.40% SOFR CME 1M + 2.50% 7.07 December 31, 2023 Weighted Average Notional Fair Maturity Classification Amounts Value Fixed Rate Floating Rate (Years) Interest rate swaps: Financial institutions Other assets $ 104,930 $ 6,367 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.51 Financial institutions Other assets 4,911 295 4.99% U.S. Prime 3.96 Customers Other assets 4,875 30 6.25% SOFR CME 1M + 2.50% 4.04 Financial institutions Other liabilities 4,875 (30) 6.25% SOFR CME 1M + 2.50% 4.04 Customers Other liabilities 4,911 (295) 4.99% U.S. Prime 3.96 Customers Other liabilities 104,930 (6,367) 3.25% - 5.58% SOFR CME 1M + 2.50% - 3.00% 4.51 Credit risk participation agreements: Financial institutions Other assets $ 20,758 $ 20 3.50% - 5.40% SOFR CME 1M + 2.50% 7.33

BORROWINGS AND BORROWING CAPA_2

BORROWINGS AND BORROWING CAPACITY (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Maturities of Long-Term Debt	Letters of credit were $1.17 billion at March 31, 2024 and will expire in the following periods (in thousands): 2024 $ 310,280 2025 296,200 2026 57,300 2027 402,500 Thereafter 100,000 Total $ 1,166,280

SUBORDINATED DEBT (Tables)

SUBORDINATED DEBT (Tables)	3 Months Ended
	Mar. 31, 2024
Subordinated Borrowings [Abstract]
Schedule of Subordinated Borrowing	A summary of pertinent information related to the Company’s junior subordinated debentures outstanding at March 31, 2024 is set forth in the table below: Description Issuance Date Trust Preferred Securities Outstanding Junior Subordinated Debt Owed to Trusts Maturity Date (1) (Dollars in thousands) Farmers & Merchants Capital Trust II November 13, 2003 $ 7,500 $ 7,732 November 8, 2033 Farmers & Merchants Capital Trust III June 30, 2005 3,500 3,609 July 7, 2035 $ 11,341 (1) All junior subordinated debentures were callable at March 31, 2024.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The amount of the Company’s income tax expense is influenced by the amount of pre-tax income, the amount of tax-exempt income and the amount of other nondeductible items. Three Months Ended March 31, 2024 March 31, 2023 Income tax expense $ 6,759 $ 9,913 Effective income tax rate 20.5 % 21.1 %

STOCK BASED COMPENSATION (Table

STOCK BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	Stock option activity during the three months ended March 31, 2024 was as follows: Number of Weighted- Weighted- Aggregate (In thousands) (In years) (In thousands) Options outstanding, January 1, 2024 258 $ 18.56 2.09 $ 2,398 Options granted — — Options exercised (22) (14.68) Options forfeited (4) 14.11 Options outstanding, March 31, 2024 232 $ 19.01 2.02 $ 1,319 Options vested and exercisable, March 31, 2024 232 $ 19.01 2.02 $ 1,319
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	Nonvested shares of restricted stock activity during the three months ended March 31, 2024 was as follows: Number of Weighted- (In thousands) Nonvested share awards outstanding, January 1, 2024 458 $ 29.38 Share awards granted 263 23.31 Share awards vested (57) (25.99) Unvested share awards forfeited or cancelled (1) (25.99) Nonvested share awards outstanding, March 31, 2024 663 27.27

OFF-BALANCE SHEET ARRANGEMENT_2

OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Fair Value, Off-balance Sheet Risks	The contractual amounts of financial instruments with off-balance sheet risk are as follows: March 31, 2024 December 31, 2023 Fixed Variable Fixed Variable (In thousands) Commitments to extend credit $ 294,694 $ 1,251,493 $ 367,068 $ 1,425,946 Standby letters of credit 14,771 24,660 16,147 21,514 Total $ 309,465 $ 1,276,153 $ 383,215 $ 1,447,460

REGULATORY CAPITAL MATTERS (Tab

REGULATORY CAPITAL MATTERS (Tables)	3 Months Ended
	Mar. 31, 2024
Regulatory Capital Matters [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following is a summary of the Company’s and the Bank’s actual and required capital ratios as of March 31, 2024 and December 31, 2023: Actual Minimum Required for Capital Adequacy Purposes Minimum Required Plus Capital Conservation Buffer To Be Categorized As Well-Capitalized Under Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) STELLAR BANCORP, INC. (Consolidated) March 31, 2024 Total Capital (to risk-weighted assets) $ 1,252,365 14.62 % $ 685,412 8.00 % $ 899,603 10.50 % N/A N/A Common Equity Tier 1 Capital (to risk-weighted assets) 1,053,055 12.29 % 385,544 4.50 % 599,735 7.00 % N/A N/A Tier 1 Capital (to risk-weighted assets) 1,062,953 12.41 % 514,059 6.00 % 728,250 8.50 % N/A N/A Tier 1 Leverage (to average tangible assets) 1,062,953 10.41 % 408,273 4.00 % 408,273 4.00 % N/A N/A December 31, 2023 Total Capital (to risk-weighted assets) $ 1,221,060 14.02 % $ 696,529 8.00 % $ 914,195 10.50 % N/A N/A Common Equity Tier 1 Capital (to risk-weighted assets) 1,025,076 11.77 % 391,798 4.50 % 604,463 7.00 % N/A N/A Tier 1 Capital (to risk-weighted assets) 1,034,974 11.89 % 522,397 6.00 % 740,062 8.50 % N/A N/A Tier 1 Leverage (to average tangible assets) 1,034,974 10.18 % 406,859 4.00 % 406,859 4.00 % N/A N/A STELLAR BANK March 31, 2024 Total Capital (to risk-weighted assets) $ 1,208,772 14.13 % $ 684,604 8.00 % $ 898,542 10.50 % $ 855,755 10.00 % Common Equity Tier 1 Capital (to risk-weighted assets) 1,079,360 12.61 % 385,090 4.50 % 599,028 7.00 % 556,240 6.50 % Tier 1 Capital (to risk-weighted assets) 1,079,360 12.61 % 513,453 6.00 % 727,391 8.50 % 684,604 8.00 % Tier 1 Leverage (to average tangible assets) 1,079,360 10.59 % 407,853 4.00 % 407,853 4.00 % 509,816 5.00 % December 31, 2023 Total Capital (to risk-weighted assets) $ 1,186,710 13.65 % $ 695,746 8.00 % $ 913,167 10.50 % $ 869,683 10.00 % Common Equity Tier 1 Capital (to risk-weighted assets) 1,060,624 12.20 % 391,357 4.50 % 608,778 7.00 % 565,294 6.50 % Tier 1 Capital (to risk-weighted assets) 1,060,624 12.20 % 521,810 6.00 % 739,231 8.50 % 695,746 8.00 % Tier 1 Leverage (to average tangible assets) 1,060,624 10.44 % 406,453 4.00 % 406,453 4.00 % 508,066 5.00 %

EARNINGS PER COMMON SHARE (Tabl

EARNINGS PER COMMON SHARE (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Restricted shares and performance share awards are considered outstanding at the date of grant, accounted for as participating securities and included in basic and diluted weighted average common shares outstanding. Three Months Ended March 31, 2024 2023 Amount Per Share Amount Per Share (Amounts in thousands, except per share data) Net income attributable to shareholders $ 26,147 $ 37,148 Basic: Weighted average shares outstanding 53,343 $ 0.49 53,021 $ 0.70 Diluted: Add incremental shares for: Dilutive effect of stock option exercises and performance share units 63 117 Total 53,406 $ 0.49 53,138 $ 0.70

NATURE OF OPERATIONS AND SUMM_3

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES (Details)	Mar. 31, 2024 office
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates	54
Houston Metropolitan
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates	37
Beaumont
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates	16
Dallas
New Accounting Pronouncement Early Adoption [Line Items]
Number of offices in which entity operates	1

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Goodwill
Balance, beginning	$ 497,318	$ 497,260	$ 497,260
Amortization			0
Goodwill true-up	58
Balance, ending	497,318
Intangible Assets
Balance, beginning	116,712
Decrease due to payoff of serviced loans	(6,212)	(6,879)
Balance, ending	110,513
Core Deposit Intangibles
Intangible Assets
Balance, beginning	116,712	143,525	143,525
Amortization			(26,813)
Decrease due to payoff of serviced loans	(6,199)		0
Balance, ending	110,513
Servicing Assets
Intangible Assets
Balance, beginning	212	$ 309	309
Amortization			(70)
Decrease due to payoff of serviced loans	(13)		$ (27)
Balance, ending	$ 199

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2024	$ 17,967
2025	21,528
2026	18,896
2027	16,272
Thereafter	35,850
Total	$ 110,513	$ 116,712

SECURITIES - Amortized Cost and

SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,687,880	$ 1,545,130
Gross Unrealized Gains	1,493	2,303
Gross Unrealized Losses	(166,273)	(151,753)
Fair Value	1,523,100	1,395,680
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	299,366	307,529
Gross Unrealized Gains	69	90
Gross Unrealized Losses	(10,070)	(10,201)
Fair Value	289,365	297,418
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	222,809	229,615
Gross Unrealized Gains	1,166	1,615
Gross Unrealized Losses	(27,227)	(27,171)
Fair Value	196,748	204,059
Agency mortgage-backed pass-through securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	454,639	424,664
Gross Unrealized Gains	39	370
Gross Unrealized Losses	(42,673)	(37,161)
Fair Value	412,005	387,873
Agency collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	593,435	462,498
Gross Unrealized Gains	185	172
Gross Unrealized Losses	(72,751)	(64,553)
Fair Value	520,869	398,117
Corporate bonds and other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	117,631	120,824
Gross Unrealized Gains	34	56
Gross Unrealized Losses	(13,552)	(12,667)
Fair Value	$ 104,113	$ 108,213

SECURITIES - Amortized Cost a_2

SECURITIES - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 76,060
Due after one year through five years	83,030
Due after five years through ten years	137,346
Due after ten years	343,370
Subtotal	639,806
Agency mortgage-backed pass-through securities and collateralized mortgage obligations	1,048,074
Amortized Cost	1,687,880	$ 1,545,130
Fair Value
Due in one year or less	74,067
Due after one year through five years	78,334
Due after five years through ten years	121,106
Due after ten years	316,719
Subtotal	590,226
Agency mortgage-backed pass-through securities and collateralized mortgage obligations	932,874
Fair Value	$ 1,523,100	$ 1,395,680

SECURITIES - Securities in a Co

SECURITIES - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Securities in a Continuous Unrealized Loss Position, Less than 12 months, Estimated Fair Value	$ 268,809	$ 225,879
Securities in a Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(8,571)	(5,739)
Securities in a Continuous Unrealized Loss Position, More than 12 Months, Estimated Fair Value	1,110,876	1,024,020
Securities in a Continuous Unrealized Loss Position, More than 12 Months Unrealized Losses	(157,702)	(146,014)
Securities in a Continuous Unrealized Loss Position, Total Estimated Fair Value	1,379,685	1,249,899
Securities in a Continuous Unrealized Loss Position, Total Unrealized Losses	(166,273)	(151,753)
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Securities in a Continuous Unrealized Loss Position, Less than 12 months, Estimated Fair Value	35,927	110,038
Securities in a Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(628)	(2,208)
Securities in a Continuous Unrealized Loss Position, More than 12 Months, Estimated Fair Value	229,325	154,145
Securities in a Continuous Unrealized Loss Position, More than 12 Months Unrealized Losses	(9,442)	(7,993)
Securities in a Continuous Unrealized Loss Position, Total Estimated Fair Value	265,252	264,183
Securities in a Continuous Unrealized Loss Position, Total Unrealized Losses	(10,070)	(10,201)
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Securities in a Continuous Unrealized Loss Position, Less than 12 months, Estimated Fair Value	2,159	1,303
Securities in a Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(16)	(14)
Securities in a Continuous Unrealized Loss Position, More than 12 Months, Estimated Fair Value	172,364	177,957
Securities in a Continuous Unrealized Loss Position, More than 12 Months Unrealized Losses	(27,211)	(27,157)
Securities in a Continuous Unrealized Loss Position, Total Estimated Fair Value	174,523	179,260
Securities in a Continuous Unrealized Loss Position, Total Unrealized Losses	(27,227)	(27,171)
Agency mortgage-backed pass-through securities
Debt Securities, Available-for-sale [Line Items]
Securities in a Continuous Unrealized Loss Position, Less than 12 months, Estimated Fair Value	104,502	80,208
Securities in a Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(2,385)	(1,444)
Securities in a Continuous Unrealized Loss Position, More than 12 Months, Estimated Fair Value	284,000	257,779
Securities in a Continuous Unrealized Loss Position, More than 12 Months Unrealized Losses	(40,288)	(35,717)
Securities in a Continuous Unrealized Loss Position, Total Estimated Fair Value	388,502	337,987
Securities in a Continuous Unrealized Loss Position, Total Unrealized Losses	(42,673)	(37,161)
Agency collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Securities in a Continuous Unrealized Loss Position, Less than 12 months, Estimated Fair Value	119,120	23,051
Securities in a Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(2,905)	(621)
Securities in a Continuous Unrealized Loss Position, More than 12 Months, Estimated Fair Value	335,294	348,854
Securities in a Continuous Unrealized Loss Position, More than 12 Months Unrealized Losses	(69,846)	(63,932)
Securities in a Continuous Unrealized Loss Position, Total Estimated Fair Value	454,414	371,905
Securities in a Continuous Unrealized Loss Position, Total Unrealized Losses	(72,751)	(64,553)
Corporate bonds and other
Debt Securities, Available-for-sale [Line Items]
Securities in a Continuous Unrealized Loss Position, Less than 12 months, Estimated Fair Value	7,101	11,279
Securities in a Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(2,637)	(1,452)
Securities in a Continuous Unrealized Loss Position, More than 12 Months, Estimated Fair Value	89,893	85,285
Securities in a Continuous Unrealized Loss Position, More than 12 Months Unrealized Losses	(10,915)	(11,215)
Securities in a Continuous Unrealized Loss Position, Total Estimated Fair Value	96,994	96,564
Securities in a Continuous Unrealized Loss Position, Total Unrealized Losses	$ (13,552)	$ (12,667)

SECURITIES - Narrative (Details

SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of available for sale securities	$ 5,100	$ 320,700
Realized gains		$ 234
Security owned and pledged as collateral, associated liabilities, fair value	$ 601,900		$ 607,500

LOANS AND ALLOWANCE FOR CREDI_3

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	$ 7,908,111	$ 7,925,133
Allowance for credit losses on loans	(96,285)	(91,684)	$ (96,188)	$ (93,180)
Loans, net	7,811,826	7,833,449
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	1,451,462	1,409,002
Allowance for credit losses on loans	(37,451)	(31,979)	(39,516)	(41,236)
Paycheck Protection Program (PPP)
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	4,293	5,100
Allowance for credit losses on loans	0	0	0	0
Real estate: | Commercial real estate (including multi-family residential)
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	4,049,885	4,071,807
Allowance for credit losses on loans	(36,611)	(38,187)	(37,700)	(32,970)
Real estate: | Commercial real estate construction and land development
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	1,039,443	1,060,406
Allowance for credit losses on loans	(14,052)	(13,627)	(13,579)	(14,121)
Real estate: | 1-4 family residential (including home equity)
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	1,049,316	1,047,174
Allowance for credit losses on loans	(5,055)	(4,785)	(2,832)	(2,709)
Real estate: | Residential construction
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	252,573	267,357
Allowance for credit losses on loans	(2,695)	(2,623)	(2,089)	(1,796)
Consumer and other
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	61,139	64,287
Allowance for credit losses on loans	$ (421)	$ (483)	$ (472)	$ (348)

LOANS AND ALLOWANCE FOR CREDI_4

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Accrued interest receivable	$ 37,900,000			$ 37,400,000
Less: allowance for credit losses on loans	96,285,000	$ 96,188,000		91,684,000	$ 93,180,000
Provision (reversal) for credit losses on loans	5,315,000	3,200,000
Non accrual loans interest income	$ 0		$ 0
Concessions granted, percent to loan portfolio (less than)	1%
Commitments to lend additional amounts	$ 1,400,000
Unfunded Loan Commitment
Financing Receivable Allowance For Credit Losses [Line Items]
Less: allowance for credit losses on loans	10,100,000			$ 11,300,000
Provision (reversal) for credit losses on loans	$ (1,200,000)	$ 466,000

LOANS AND ALLOWANCE FOR CREDI_5

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging Analysis of the Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 7,908,111	$ 7,925,133
Nonaccrual Loans	57,129	39,191
30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	31,817	27,466
90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	31,817	27,466
Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	7,819,165	7,858,476
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Loans	1,451,462	1,409,002
Nonaccrual Loans	15,465	5,048
Commercial and industrial | 30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	7,137	6,096
Commercial and industrial | 90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Commercial and industrial | Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	7,137	6,096
Commercial and industrial | Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,428,860	1,397,858
Paycheck Protection Program (PPP)
Accounts Notes And Loans Receivable [Line Items]
Loans	4,293	5,100
Nonaccrual Loans	0	0
Paycheck Protection Program (PPP) | 30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	81	375
Paycheck Protection Program (PPP) | 90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Paycheck Protection Program (PPP) | Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	81	375
Paycheck Protection Program (PPP) | Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	4,212	4,725
Real estate: | Commercial real estate (including multi-family residential)
Accounts Notes And Loans Receivable [Line Items]
Loans	4,049,885	4,071,807
Nonaccrual Loans	21,268	16,699
Real estate: | Commercial real estate (including multi-family residential) | 30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	13,498	9,600
Real estate: | Commercial real estate (including multi-family residential) | 90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Real estate: | Commercial real estate (including multi-family residential) | Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	13,498	9,600
Real estate: | Commercial real estate (including multi-family residential) | Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	4,015,119	4,045,508
Real estate: | Commercial real estate construction and land development
Accounts Notes And Loans Receivable [Line Items]
Loans	1,039,443	1,060,406
Nonaccrual Loans	8,406	5,043
Real estate: | Commercial real estate construction and land development | 30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	4,345	7,341
Real estate: | Commercial real estate construction and land development | 90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Real estate: | Commercial real estate construction and land development | Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	4,345	7,341
Real estate: | Commercial real estate construction and land development | Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,026,692	1,048,022
Real estate: | 1-4 family residential (including home equity)
Accounts Notes And Loans Receivable [Line Items]
Loans	1,049,316	1,047,174
Nonaccrual Loans	10,368	8,874
Real estate: | 1-4 family residential (including home equity) | 30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	6,170	3,492
Real estate: | 1-4 family residential (including home equity) | 90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Real estate: | 1-4 family residential (including home equity) | Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	6,170	3,492
Real estate: | 1-4 family residential (including home equity) | Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,032,778	1,034,808
Real estate: | Residential construction
Accounts Notes And Loans Receivable [Line Items]
Loans	252,573	267,357
Nonaccrual Loans	1,410	3,288
Real estate: | Residential construction | 30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	575	498
Real estate: | Residential construction | 90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Real estate: | Residential construction | Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	575	498
Real estate: | Residential construction | Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	250,588	263,571
Consumer and other
Accounts Notes And Loans Receivable [Line Items]
Loans	61,139	64,287
Nonaccrual Loans	212	239
Consumer and other | 30-89 Days
Accounts Notes And Loans Receivable [Line Items]
Loans	11	64
Consumer and other | 90 or More Days
Accounts Notes And Loans Receivable [Line Items]
Loans	0	0
Consumer and other | Total Past Due Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	11	64
Consumer and other | Current Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 60,916	$ 63,984

LOANS AND ALLOWANCE FOR CREDI_6

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Risk Ratings by Category of Loans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	$ 375,892,000
Origination Year, 2023	1,325,876,000
Origination Year, 2022	2,359,850,000
Origination Year, 2021	1,377,455,000
Origination Year, 2020	624,093,000
Origination Year, Prior	925,167,000
Revolving Loans	845,230,000
Revolving Loans Converted to Term Loans	74,548,000
Total loans	7,908,111,000	$ 7,925,133,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	5,000
Origination Year, 2022	30,000
Origination Year, 2021	612,000
Origination Year, 2020	144,000
Origination Year, Prior	0
Revolving Loans	50,000
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	841,000
Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	367,129,000
Origination Year, 2023	1,292,148,000
Origination Year, 2022	2,318,318,000
Origination Year, 2021	1,314,757,000
Origination Year, 2020	591,153,000
Origination Year, Prior	877,074,000
Revolving Loans	818,491,000
Revolving Loans Converted to Term Loans	68,219,000
Total loans	7,647,289,000	7,714,375,000
Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	4,912,000
Origination Year, 2023	12,590,000
Origination Year, 2022	22,761,000
Origination Year, 2021	18,004,000
Origination Year, 2020	22,259,000
Origination Year, Prior	9,706,000
Revolving Loans	6,118,000
Revolving Loans Converted to Term Loans	2,120,000
Total loans	98,470,000	78,011,000
Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	3,851,000
Origination Year, 2023	21,091,000
Origination Year, 2022	18,771,000
Origination Year, 2021	44,694,000
Origination Year, 2020	10,681,000
Origination Year, Prior	38,387,000
Revolving Loans	20,621,000
Revolving Loans Converted to Term Loans	4,209,000
Total loans	162,305,000	132,699,000
Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	47,000
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	47,000	48,000
Commercial and industrial
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	107,858,000
Origination Year, 2023	295,147,000
Origination Year, 2022	223,480,000
Origination Year, 2021	154,797,000
Origination Year, 2020	36,367,000
Origination Year, Prior	47,654,000
Revolving Loans	548,975,000
Revolving Loans Converted to Term Loans	37,184,000
Total loans	1,451,462,000	1,409,002,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	30,000
Origination Year, 2021	85,000
Origination Year, 2020	144,000
Origination Year, Prior	0
Revolving Loans	50,000
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	309,000
Commercial and industrial | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	107,787,000
Origination Year, 2023	292,611,000
Origination Year, 2022	217,128,000
Origination Year, 2021	153,240,000
Origination Year, 2020	35,742,000
Origination Year, Prior	34,744,000
Revolving Loans	533,879,000
Revolving Loans Converted to Term Loans	33,792,000
Total loans	1,408,923,000	1,377,118,000
Commercial and industrial | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	115,000
Origination Year, 2022	2,270,000
Origination Year, 2021	589,000
Origination Year, 2020	66,000
Origination Year, Prior	325,000
Revolving Loans	3,459,000
Revolving Loans Converted to Term Loans	1,460,000
Total loans	8,284,000	8,340,000
Commercial and industrial | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	71,000
Origination Year, 2023	2,374,000
Origination Year, 2022	4,082,000
Origination Year, 2021	968,000
Origination Year, 2020	559,000
Origination Year, Prior	12,585,000
Revolving Loans	11,637,000
Revolving Loans Converted to Term Loans	1,932,000
Total loans	34,208,000	23,496,000
Commercial and industrial | Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	47,000
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	47,000	48,000
Paycheck Protection Program (PPP)
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	2,347,000
Origination Year, 2020	1,946,000
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	4,293,000	5,100,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	0
Paycheck Protection Program (PPP) | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	2,347,000
Origination Year, 2020	1,946,000
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	4,293,000	5,100,000
Paycheck Protection Program (PPP) | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	0	0
Paycheck Protection Program (PPP) | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	0	0
Paycheck Protection Program (PPP) | Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	0	0
Real estate: | Commercial real estate (including multi-family residential)
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	101,173,000
Origination Year, 2023	445,758,000
Origination Year, 2022	1,333,057,000
Origination Year, 2021	872,418,000
Origination Year, 2020	445,339,000
Origination Year, Prior	712,017,000
Revolving Loans	119,410,000
Revolving Loans Converted to Term Loans	20,713,000
Total loans	4,049,885,000	4,071,807,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	527,000
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	527,000
Real estate: | Commercial real estate (including multi-family residential) | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	96,235,000
Origination Year, 2023	425,893,000
Origination Year, 2022	1,309,676,000
Origination Year, 2021	834,247,000
Origination Year, 2020	417,006,000
Origination Year, Prior	689,186,000
Revolving Loans	116,365,000
Revolving Loans Converted to Term Loans	20,128,000
Total loans	3,908,736,000	3,959,675,000
Real estate: | Commercial real estate (including multi-family residential) | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	2,745,000
Origination Year, 2023	10,358,000
Origination Year, 2022	11,822,000
Origination Year, 2021	15,343,000
Origination Year, 2020	20,377,000
Origination Year, Prior	7,840,000
Revolving Loans	2,659,000
Revolving Loans Converted to Term Loans	485,000
Total loans	71,629,000	54,483,000
Real estate: | Commercial real estate (including multi-family residential) | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	2,193,000
Origination Year, 2023	9,507,000
Origination Year, 2022	11,559,000
Origination Year, 2021	22,828,000
Origination Year, 2020	7,956,000
Origination Year, Prior	14,991,000
Revolving Loans	386,000
Revolving Loans Converted to Term Loans	100,000
Total loans	69,520,000	57,649,000
Real estate: | Commercial real estate (including multi-family residential) | Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	0	0
Real estate: | Commercial real estate construction and land development
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	80,690,000
Origination Year, 2023	277,899,000
Origination Year, 2022	453,107,000
Origination Year, 2021	123,005,000
Origination Year, 2020	24,739,000
Origination Year, Prior	15,241,000
Revolving Loans	61,666,000
Revolving Loans Converted to Term Loans	3,096,000
Total loans	1,039,443,000	1,060,406,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	0
Real estate: | Commercial real estate construction and land development | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	78,696,000
Origination Year, 2023	273,479,000
Origination Year, 2022	443,705,000
Origination Year, 2021	105,452,000
Origination Year, 2020	24,665,000
Origination Year, Prior	14,684,000
Revolving Loans	61,296,000
Revolving Loans Converted to Term Loans	2,772,000
Total loans	1,004,749,000	1,032,789,000
Real estate: | Commercial real estate construction and land development | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	1,994,000
Origination Year, 2023	1,140,000
Origination Year, 2022	7,801,000
Origination Year, 2021	237,000
Origination Year, 2020	0
Origination Year, Prior	478,000
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	11,650,000	9,737,000
Real estate: | Commercial real estate construction and land development | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	3,280,000
Origination Year, 2022	1,601,000
Origination Year, 2021	17,316,000
Origination Year, 2020	74,000
Origination Year, Prior	79,000
Revolving Loans	370,000
Revolving Loans Converted to Term Loans	324,000
Total loans	23,044,000	17,880,000
Real estate: | Commercial real estate construction and land development | Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	0	0
Real estate: | 1-4 family residential (including home equity)
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	32,260,000
Origination Year, 2023	160,141,000
Origination Year, 2022	268,451,000
Origination Year, 2021	215,480,000
Origination Year, 2020	111,592,000
Origination Year, Prior	149,110,000
Revolving Loans	99,358,000
Revolving Loans Converted to Term Loans	12,924,000
Total loans	1,049,316,000	1,047,174,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	0
Real estate: | 1-4 family residential (including home equity) | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	30,500,000
Origination Year, 2023	157,208,000
Origination Year, 2022	266,182,000
Origination Year, 2021	210,530,000
Origination Year, 2020	107,684,000
Origination Year, Prior	137,325,000
Revolving Loans	91,132,000
Revolving Loans Converted to Term Loans	11,046,000
Total loans	1,011,607,000	1,011,743,000
Real estate: | 1-4 family residential (including home equity) | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	173,000
Origination Year, 2023	977,000
Origination Year, 2022	850,000
Origination Year, 2021	1,470,000
Origination Year, 2020	1,816,000
Origination Year, Prior	1,063,000
Revolving Loans	0
Revolving Loans Converted to Term Loans	175,000
Total loans	6,524,000	5,384,000
Real estate: | 1-4 family residential (including home equity) | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	1,587,000
Origination Year, 2023	1,956,000
Origination Year, 2022	1,419,000
Origination Year, 2021	3,480,000
Origination Year, 2020	2,092,000
Origination Year, Prior	10,722,000
Revolving Loans	8,226,000
Revolving Loans Converted to Term Loans	1,703,000
Total loans	31,185,000	30,047,000
Real estate: | 1-4 family residential (including home equity) | Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	0	0
Real estate: | Residential construction
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	39,851,000
Origination Year, 2023	127,516,000
Origination Year, 2022	74,617,000
Origination Year, 2021	6,507,000
Origination Year, 2020	2,437,000
Origination Year, Prior	489,000
Revolving Loans	1,156,000
Revolving Loans Converted to Term Loans	0
Total loans	252,573,000	267,357,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	0
Real estate: | Residential construction | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	39,851,000
Origination Year, 2023	123,542,000
Origination Year, 2022	74,617,000
Origination Year, 2021	6,142,000
Origination Year, 2020	2,437,000
Origination Year, Prior	489,000
Revolving Loans	1,156,000
Revolving Loans Converted to Term Loans	0
Total loans	248,234,000	264,069,000
Real estate: | Residential construction | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	365,000
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	365,000	0
Real estate: | Residential construction | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	3,974,000
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	3,974,000	3,288,000
Real estate: | Residential construction | Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	0	0
Consumer and other
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	14,060,000
Origination Year, 2023	19,415,000
Origination Year, 2022	7,138,000
Origination Year, 2021	2,901,000
Origination Year, 2020	1,673,000
Origination Year, Prior	656,000
Revolving Loans	14,665,000
Revolving Loans Converted to Term Loans	631,000
Total loans	61,139,000	64,287,000
Current period gross charge-offs
Origination Year, 2024	0
Origination Year, 2023	5,000
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans
Revolving Loans Converted to Term Loans	0
Current-period gross charge-offs, Total	5,000
Consumer and other | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	14,060,000
Origination Year, 2023	19,415,000
Origination Year, 2022	7,010,000
Origination Year, 2021	2,799,000
Origination Year, 2020	1,673,000
Origination Year, Prior	646,000
Revolving Loans	14,663,000
Revolving Loans Converted to Term Loans	481,000
Total loans	60,747,000	63,881,000
Consumer and other | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	18,000
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	18,000	67,000
Consumer and other | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	110,000
Origination Year, 2021	102,000
Origination Year, 2020	0
Origination Year, Prior	10,000
Revolving Loans	2,000
Revolving Loans Converted to Term Loans	150,000
Total loans	374,000	339,000
Consumer and other | Doubtful
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination Year, 2024	0
Origination Year, 2023	0
Origination Year, 2022	0
Origination Year, 2021	0
Origination Year, 2020	0
Origination Year, Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total loans	$ 0	$ 0

LOANS AND ALLOWANCE FOR CREDI_7

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Allowance for credit losses on loans:
Balance, beginning of period	$ 91,684	$ 93,180
Provision for credit losses on loans	5,315	3,200
Charge-offs	(841)	(434)
Recoveries	127	242
Net charge-offs	(714)	(192)
Balance, end of period	96,285	96,188
Commercial and industrial
Allowance for credit losses on loans:
Balance, beginning of period	31,979	41,236
Provision for credit losses on loans	5,667	(1,502)
Charge-offs	(309)	(426)
Recoveries	114	208
Net charge-offs	(195)	(218)
Balance, end of period	37,451	39,516
Paycheck Protection Program (PPP)
Allowance for credit losses on loans:
Balance, beginning of period	0	0
Provision for credit losses on loans		0
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Balance, end of period	0	0
Real estate: | Commercial real estate (including multi-family residential)
Allowance for credit losses on loans:
Balance, beginning of period	38,187	32,970
Provision for credit losses on loans	(1,049)	4,716
Charge-offs	(527)	0
Recoveries	0	14
Net charge-offs	(527)	14
Balance, end of period	36,611	37,700
Real estate: | Commercial real estate construction and land development
Allowance for credit losses on loans:
Balance, beginning of period	13,627	14,121
Provision for credit losses on loans	425	(542)
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Balance, end of period	14,052	13,579
Real estate: | 1-4 family residential (including home equity)
Allowance for credit losses on loans:
Balance, beginning of period	4,785	2,709
Provision for credit losses on loans	265	116
Charge-offs	0	0
Recoveries	5	7
Net charge-offs	5	7
Balance, end of period	5,055	2,832
Real estate: | Residential construction
Allowance for credit losses on loans:
Balance, beginning of period	2,623	1,796
Provision for credit losses on loans	72	293
Charge-offs	0	0
Recoveries	0	0
Net charge-offs	0	0
Balance, end of period	2,695	2,089
Consumer and other
Allowance for credit losses on loans:
Balance, beginning of period	483	348
Provision for credit losses on loans	(65)	119
Charge-offs	(5)	(8)
Recoveries	8	13
Net charge-offs	3	5
Balance, end of period	$ 421	$ 472

LOANS AND ALLOWANCE FOR CREDI_8

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Amortized Cost Basis of Collateral Dependent Loans Individually Evaluated to Determine Expected Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	$ 9,227	$ 6,479
Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	9,209	6,409
Business Assets
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	18	70
Other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	18	70
Commercial and industrial | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Commercial and industrial | Business Assets
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	18	70
Commercial and industrial | Other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Commercial real estate (including multi-family residential)
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	7,410	5,548
Real estate: | Commercial real estate (including multi-family residential) | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	7,410	5,548
Real estate: | Commercial real estate (including multi-family residential) | Business Assets
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Commercial real estate (including multi-family residential) | Other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Commercial real estate construction and land development
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	1,179	437
Real estate: | Commercial real estate construction and land development | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	1,179	437
Real estate: | Commercial real estate construction and land development | Business Assets
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Commercial real estate construction and land development | Other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | 1-4 family residential (including home equity)
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	620	424
Real estate: | 1-4 family residential (including home equity) | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	620	424
Real estate: | 1-4 family residential (including home equity) | Business Assets
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | 1-4 family residential (including home equity) | Other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Residential construction
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Residential construction | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Residential construction | Business Assets
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Real estate: | Residential construction | Other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Consumer and other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Consumer and other | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Consumer and other | Business Assets
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	0	0
Consumer and other | Other
Financing Receivable Allowance For Credit Losses [Line Items]
Finance receivables allowance of credit losses	$ 0	$ 0

LOANS AND ALLOWANCE FOR CREDI_9

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	$ 31,984	$ 29,245
Nonaccrual Loans with Related Allowance	25,145	9,946
Total Nonaccrual Loans	57,129	39,191
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	1,073	1,616
Nonaccrual Loans with Related Allowance	14,392	3,432
Total Nonaccrual Loans	15,465	5,048
Paycheck Protection Program (PPP)
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	0	0
Nonaccrual Loans with Related Allowance	0	0
Total Nonaccrual Loans	0	0
Real estate: | Commercial real estate (including multi-family residential)
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	15,905	11,844
Nonaccrual Loans with Related Allowance	5,363	4,855
Total Nonaccrual Loans	21,268	16,699
Real estate: | Commercial real estate construction and land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	7,664	5,043
Nonaccrual Loans with Related Allowance	742	0
Total Nonaccrual Loans	8,406	5,043
Real estate: | 1-4 family residential (including home equity)
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	7,310	7,400
Nonaccrual Loans with Related Allowance	3,058	1,474
Total Nonaccrual Loans	10,368	8,874
Real estate: | Residential construction
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	0	3,288
Nonaccrual Loans with Related Allowance	1,410	0
Total Nonaccrual Loans	1,410	3,288
Consumer and other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual Loans with No Related Allowance	32	54
Nonaccrual Loans with Related Allowance	180	185
Total Nonaccrual Loans	$ 212	$ 239

LOANS AND ALLOWANCE FOR CRED_10

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Modified Borrowers Experiencing Financial Difficulty (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	$ 10,304,000	$ 3,870,000
Interest Rate Reduction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	96,000
Term Extension
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	3,211,000	3,774,000
Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	4,444,000	0
Principal forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Combination Term Extension and Principal Forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Combination Term Extension and Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	2,649,000	0
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	2,341,000	2,347,000
Commercial and industrial | Interest Rate Reduction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	96,000
Commercial and industrial | Term Extension
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	1,059,000	2,251,000
Commercial and industrial | Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	814,000	0
Commercial and industrial | Principal forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Commercial and industrial | Combination Term Extension and Principal Forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Commercial and industrial | Combination Term Extension and Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	468,000	0
Real estate: | Commercial real estate (including multi-family residential)
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	1,800,000	798,000
Real estate: | Commercial real estate (including multi-family residential) | Interest Rate Reduction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Commercial real estate (including multi-family residential) | Term Extension
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	798,000
Real estate: | Commercial real estate (including multi-family residential) | Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	1,800,000	0
Real estate: | Commercial real estate (including multi-family residential) | Principal forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Commercial real estate (including multi-family residential) | Combination Term Extension and Principal Forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Commercial real estate (including multi-family residential) | Combination Term Extension and Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0
Real estate: | Commercial real estate construction and land development
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	4,041,000	0
Real estate: | Commercial real estate construction and land development | Interest Rate Reduction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Commercial real estate construction and land development | Term Extension
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	2,097,000	0
Real estate: | Commercial real estate construction and land development | Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Commercial real estate construction and land development | Principal forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Commercial real estate construction and land development | Combination Term Extension and Principal Forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Commercial real estate construction and land development | Combination Term Extension and Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	1,944,000	0
Real estate: | 1-4 family residential (including home equity)
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	657,000	725,000
Real estate: | 1-4 family residential (including home equity) | Interest Rate Reduction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | 1-4 family residential (including home equity) | Term Extension
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	725,000
Real estate: | 1-4 family residential (including home equity) | Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	657,000	0
Real estate: | 1-4 family residential (including home equity) | Principal forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | 1-4 family residential (including home equity) | Combination Term Extension and Principal Forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | 1-4 family residential (including home equity) | Combination Term Extension and Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Residential construction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	1,465,000	0
Real estate: | Residential construction | Interest Rate Reduction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Residential construction | Term Extension
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	55,000	0
Real estate: | Residential construction | Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	1,173,000	0
Real estate: | Residential construction | Principal forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Residential construction | Combination Term Extension and Principal Forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Real estate: | Residential construction | Combination Term Extension and Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	237,000	0
Consumer and other
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Consumer and other | Interest Rate Reduction
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Consumer and other | Term Extension
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Consumer and other | Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Consumer and other | Principal forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Consumer and other | Combination Term Extension and Principal Forgiveness
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	0	0
Consumer and other | Combination Term Extension and Payment Delay
Accounts Notes And Loans Receivable [Line Items]
Financing receivable, modified period	$ 0	$ 0

LOANS AND ALLOWANCE FOR CRED_11

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Financial Effects of Loans Modified (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%
Weighted-Average Term Extension	4 months	29 months
Real estate: | Commercial real estate (including multi-family residential)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%
Weighted-Average Term Extension		6 months
Real estate: | Commercial real estate construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%
Weighted-Average Term Extension	5 months
Real estate: | 1-4 family residential (including home equity)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%
Weighted-Average Term Extension		12 months
Real estate: | Residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%
Weighted-Average Term Extension	6 months
Consumer and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	0%	0%

LOANS AND ALLOWANCE FOR CRED_12

LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans with Payment Default, Modified (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	$ 1,961
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	1,173
Combination Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	69
Commercial and industrial | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	142
Commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Commercial and industrial | Combination Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | Commercial real estate (including multi-family residential) | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | Commercial real estate (including multi-family residential) | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | Commercial real estate (including multi-family residential) | Combination Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | Commercial real estate construction and land development | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	1,727
Real estate: | Commercial real estate construction and land development | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | Commercial real estate construction and land development | Combination Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | 1-4 family residential (including home equity) | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | 1-4 family residential (including home equity) | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | 1-4 family residential (including home equity) | Combination Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	69
Real estate: | Residential construction | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Real estate: | Residential construction | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	1,173
Real estate: | Residential construction | Combination Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Consumer and other | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	92
Consumer and other | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	0
Consumer and other | Combination Term Extension and Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis, subsequent default loans	$ 0

LEASES - Narrative (Details)

LEASES - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 lease
Leases [Abstract]
Number of leased branch locations and office space along with equipment	31

LEASES - Supplemental Lease Inf

LEASES - Supplemental Lease Information (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Balance Sheet:
Operating lease right-of-use asset classified as premises and equipment	$ 19,193	$ 20,746
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Premises and equipment, net	Premises and equipment, net
Operating lease liability classified as other liabilities	$ 19,658	$ 20,659
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Weighted average lease term, in years	7 years 7 months 17 days	7 years 8 months 1 day
Weighted average discount rate	4.21%	4.17%

LEASES - Summary of Lease Costs

LEASES - Summary of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement:
Operating lease cost	$ 1,943	$ 1,809
Short-term lease cost	6	5
Total operating lease costs	$ 1,949	$ 1,814

LEASES - Maturity Analysis of L

LEASES - Maturity Analysis of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Lease payments due:
Within one year	$ 3,281	$ 4,428
After one but within two years	4,191	3,978
After two but within three years	3,667	3,430
After three but within four years	3,469	3,227
After four but within five years	3,294	3,047
After five years	6,815	6,605
Total lease payments	24,717	24,715
Less: discount on cash flows	(5,059)	(4,056)
Operating lease liability classified as other liabilities	$ 19,658	$ 20,659

FAIR VALUE - Carrying Amounts a

FAIR VALUE - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	$ 1,523,100	$ 1,395,680
Accrued interest receivable	37,900	37,400
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	399,742	399,237
Available for sale securities	1,523,100	1,395,680
Loans held for investment, net of allowance	7,811,826	7,833,449
Accrued interest receivable	45,466	44,244
Deposits	8,794,716	8,873,467
Accrued interest payable	12,227	11,288
Borrowed funds	215,000	50,000
Subordinated debt	109,864	109,765
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	399,742	399,237
Available for sale securities	1,523,100	1,395,680
Loans held for investment, net of allowance	7,583,625	7,627,962
Accrued interest receivable	45,466	44,244
Deposits	8,788,761	8,866,645
Accrued interest payable	12,227	11,288
Borrowed funds	215,000	50,000
Subordinated debt	108,739	109,390
Estimated Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	399,742	399,237
Available for sale securities	0	0
Loans held for investment, net of allowance	0	0
Accrued interest receivable	297	118
Deposits	0	0
Accrued interest payable	0	0
Borrowed funds	0	0
Subordinated debt	0	0
Estimated Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Available for sale securities	1,523,100	1,395,680
Loans held for investment, net of allowance	0	0
Accrued interest receivable	7,286	6,716
Deposits	8,788,761	8,866,645
Accrued interest payable	12,227	11,288
Borrowed funds	215,000	50,000
Subordinated debt	108,739	109,390
Estimated Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Available for sale securities	0	0
Loans held for investment, net of allowance	7,583,625	7,627,962
Accrued interest receivable	37,883	37,410
Deposits	0	0
Accrued interest payable	0	0
Borrowed funds	0	0
Subordinated debt	$ 0	$ 0

FAIR VALUE - Fair Values for As

FAIR VALUE - Fair Values for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]
Fair Value	$ 1,523,100	$ 1,395,680
U.S. government and agency securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	289,365	297,418
Municipal securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	196,748	204,059
Agency mortgage-backed pass-through securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	412,005	387,873
Agency collateralized mortgage obligations
Assets, Fair Value Disclosure [Abstract]
Fair Value	520,869	398,117
Corporate bonds and other
Assets, Fair Value Disclosure [Abstract]
Fair Value	104,113	108,213
Recurring Basis
Assets, Fair Value Disclosure [Abstract]
Fair Value		1,402,392
Total fair value of financial assets	1,530,483
Liabilities, Fair Value Disclosure [Abstract]
Total fair value of financial liabilities	7,370	6,692
Recurring Basis | Interest rate swaps
Liabilities, Fair Value Disclosure [Abstract]
Interest rate swaps	7,370	6,692
Recurring Basis | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value		0
Total fair value of financial assets	0
Liabilities, Fair Value Disclosure [Abstract]
Total fair value of financial liabilities	0	0
Recurring Basis | Level 1 | Interest rate swaps
Liabilities, Fair Value Disclosure [Abstract]
Interest rate swaps	0	0
Recurring Basis | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value		1,402,372
Total fair value of financial assets	1,530,470
Liabilities, Fair Value Disclosure [Abstract]
Total fair value of financial liabilities	7,370	6,692
Recurring Basis | Level 2 | Interest rate swaps
Liabilities, Fair Value Disclosure [Abstract]
Interest rate swaps	7,370	6,692
Recurring Basis | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value		20
Total fair value of financial assets	13
Liabilities, Fair Value Disclosure [Abstract]
Total fair value of financial liabilities	0	0
Recurring Basis | Level 3 | Interest rate swaps
Liabilities, Fair Value Disclosure [Abstract]
Interest rate swaps	0	0
Recurring Basis | U.S. government and agency securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	289,365	297,418
Recurring Basis | U.S. government and agency securities | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | U.S. government and agency securities | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	289,365	297,418
Recurring Basis | U.S. government and agency securities | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Municipal securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	196,748	204,059
Recurring Basis | Municipal securities | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Municipal securities | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	196,748	204,059
Recurring Basis | Municipal securities | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Agency mortgage-backed pass-through securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	412,005	387,873
Recurring Basis | Agency mortgage-backed pass-through securities | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Agency mortgage-backed pass-through securities | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	412,005	387,873
Recurring Basis | Agency mortgage-backed pass-through securities | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Agency collateralized mortgage obligations
Assets, Fair Value Disclosure [Abstract]
Fair Value	520,869	398,117
Recurring Basis | Agency collateralized mortgage obligations | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Agency collateralized mortgage obligations | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	520,869	398,117
Recurring Basis | Agency collateralized mortgage obligations | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Corporate bonds and other
Assets, Fair Value Disclosure [Abstract]
Fair Value	104,113	108,213
Recurring Basis | Corporate bonds and other | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Corporate bonds and other | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	104,113	108,213
Recurring Basis | Corporate bonds and other | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Interest rate swaps
Assets, Fair Value Disclosure [Abstract]
Fair Value	7,370	6,692
Recurring Basis | Interest rate swaps | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Interest rate swaps | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	7,370	6,692
Recurring Basis | Interest rate swaps | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Credit risk participation agreements
Assets, Fair Value Disclosure [Abstract]
Fair Value	13	20
Recurring Basis | Credit risk participation agreements | Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Credit risk participation agreements | Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Recurring Basis | Credit risk participation agreements | Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	$ 13	$ 20

FAIR VALUE - Narrative (Details

FAIR VALUE - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between levels	$ 0	$ 0
Liabilities measured at fair value	7,370,000		$ 6,692,000
Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	$ 0		$ 0

FAIR VALUE - Assets Measured at

FAIR VALUE - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Branch assets held for sale		$ 2,033
Total fair value of financial assets	$ 0	2,033
Level 1 | Commercial real estate construction and land development
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 1 | 1-4 family residential (including home equity)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 1 | Residential construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0
Level 1 | Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 1 | Commercial real estate (including multi-family residential)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 1 | Consumer and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Branch assets held for sale		0
Total fair value of financial assets	0	0
Level 2 | Commercial real estate construction and land development
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2 | 1-4 family residential (including home equity)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2 | Residential construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0
Level 2 | Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2 | Commercial real estate (including multi-family residential)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2 | Consumer and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Branch assets held for sale		0
Total fair value of financial assets	41,046	27,870
Level 3 | Commercial real estate construction and land development
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	8,708	6,654
Level 3 | 1-4 family residential (including home equity)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	4,997	3,892
Level 3 | Residential construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	1,192
Level 3 | Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	18,691	10,084
Level 3 | Commercial real estate (including multi-family residential)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	7,373	7,134
Level 3 | Consumer and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 85	$ 106

DEPOSITS - Narrative (Details)

DEPOSITS - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Deposit Liabilities [Abstract]
Time deposits, at or above FDIC insurance limit	$ 542.3	$ 548.4
Brokered deposits	$ 786.6	$ 615.9

DEPOSITS - Time Deposits by Mat

DEPOSITS - Time Deposits by Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Deposit Liabilities [Abstract]
Within one year	$ 1,538,006
After one but within two years	60,069
Over three years	93,464
Total	$ 1,691,539	$ 1,529,876

DERIVATIVE INSTRUMENTS - Narrat

DERIVATIVE INSTRUMENTS - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2024 interest_rate_swap creditAgreement	Dec. 31, 2023 interest_rate_swap creditAgreement
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of interest rate swap agreements outstanding | interest_rate_swap	14	15
Number of credit risk participation agreements | creditAgreement	3	3

DERIVATIVE INSTRUMENTS - Effect

DERIVATIVE INSTRUMENTS - Effect of Cash Flow Hedge Relationship on Statement of Comprehensive Income (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023	Dec. 31, 2023
Other liabilities | Minimum | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate	2.50%
Other liabilities | Maximum | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate	3%
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions One | Other assets
Derivative Instruments Gain Loss [Line Items]
Notional Amount		$ 104,930,000		$ 103,805,000
Fair Value, Asset		$ 6,367,000		7,011,000
Weighted Average Maturity (Years)		4 years 6 months 3 days	4 years 3 months 3 days
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions One | Other assets | Minimum
Derivative Instruments Gain Loss [Line Items]
Fixed Rate	3.25%	3.25%
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions One | Other assets | Minimum | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate	2.50%	2.50%
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions One | Other assets | Maximum
Derivative Instruments Gain Loss [Line Items]
Fixed Rate	5.58%	5.58%
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions One | Other assets | Maximum | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate	3%	3%
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions One | Other liabilities
Derivative Instruments Gain Loss [Line Items]
Notional Amount		$ 4,875,000
Fair Value, Liability		$ (30,000)
Fixed Rate		6.25%
Weighted Average Maturity (Years)		4 years 14 days
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions One | Other liabilities | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate		2.50%
Not Designated as Hedging Instrument | Interest Rate Swap With Financial Institutions Two | Other assets
Derivative Instruments Gain Loss [Line Items]
Notional Amount		$ 4,911,000		4,880,000
Fair Value, Asset		$ 295,000		359,000
Fixed Rate	4.99%	4.99%
Weighted Average Maturity (Years)		3 years 11 months 15 days	3 years 8 months 15 days
Not Designated as Hedging Instrument | Interest Rate Swaps With Customers | Other assets
Derivative Instruments Gain Loss [Line Items]
Notional Amount		$ 4,875,000
Fair Value, Asset		$ 30,000
Fixed Rate		6.25%
Weighted Average Maturity (Years)		4 years 14 days
Not Designated as Hedging Instrument | Interest Rate Swaps With Customers | Other assets | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate		2.50%
Not Designated as Hedging Instrument | Interest Rate Swaps With Customers | Other liabilities
Derivative Instruments Gain Loss [Line Items]
Notional Amount		$ 4,911,000		4,880,000
Fair Value, Liability		$ (295,000)		$ (359,000)
Fixed Rate		4.99%		4.99%
Weighted Average Maturity (Years)		3 years 11 months 15 days	3 years 8 months 15 days
Not Designated as Hedging Instrument | Interest Rate Swap With Customers Two | Other liabilities
Derivative Instruments Gain Loss [Line Items]
Notional Amount		$ 104,930,000		$ 103,805,000
Fair Value, Liability		$ (6,367,000)		$ (7,011,000)
Weighted Average Maturity (Years)		4 years 6 months 3 days	4 years 3 months 3 days
Not Designated as Hedging Instrument | Interest Rate Swap With Customers Two | Other liabilities | Minimum
Derivative Instruments Gain Loss [Line Items]
Fixed Rate	3.25%	3.25%
Not Designated as Hedging Instrument | Interest Rate Swap With Customers Two | Other liabilities | Minimum | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate		2.50%
Not Designated as Hedging Instrument | Interest Rate Swap With Customers Two | Other liabilities | Maximum
Derivative Instruments Gain Loss [Line Items]
Fixed Rate	5.58%	5.58%
Not Designated as Hedging Instrument | Interest Rate Swap With Customers Two | Other liabilities | Maximum | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate		3%
Not Designated as Hedging Instrument | Credit Risk Participation Agreement With Financial Institution | Other assets
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 20,557,000	$ 20,758,000
Fair Value, Asset	$ 13,000	$ 20,000
Weighted Average Maturity (Years)	7 years 25 days	7 years 3 months 29 days
Not Designated as Hedging Instrument | Credit Risk Participation Agreement With Financial Institution | Other assets | SOFR
Derivative Instruments Gain Loss [Line Items]
Floating Rate	2.50%	2.50%
Not Designated as Hedging Instrument | Credit Risk Participation Agreement With Financial Institution | Other assets | Minimum
Derivative Instruments Gain Loss [Line Items]
Fixed Rate	3.50%	3.50%
Not Designated as Hedging Instrument | Credit Risk Participation Agreement With Financial Institution | Other assets | Maximum
Derivative Instruments Gain Loss [Line Items]
Fixed Rate	5.40%	5.40%

BORROWINGS AND BORROWING CAPA_3

BORROWINGS AND BORROWING CAPACITY (Details) - USD ($)	Dec. 13, 2022	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Letters of credit, outstanding amount		$ 1,170,000,000	$ 1,820,000,000
Frost Agreement | Line of Credit | Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75,000,000
Letters of credit, outstanding amount		0
Period to draw	24 months
Long-Term Debt, Amortization Period	60 months
Interest payment period	24 months
Debt service ratio	1.25
Texas ratio	0.250
Leverage ratio	0.070
Federal Home Loan Bank of Dallas
Debt Instrument [Line Items]
Maximum borrowing capacity		3,520,000,000
Remaining borrowing capacity		2,140,000,000
Outstanding amount		1,380,000,000
Letters of credit, outstanding amount		1,170,000,000
Federal Home Loan Bank of Dallas | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Federal Home Loan Bank, advances		$ 215,000,000
Weighted average interest rate		5.60%
Federal Home Loan Bank of Dallas | Weighted Average | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Federal Home Loan Bank, advances, interest rate	3.50%

BORROWINGS AND BORROWING CAPA_4

BORROWINGS AND BORROWING CAPACITY - Scheduled Principal Maturities (Details) - Federal Home Loan Bank of Dallas $ in Thousands	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
2024	$ 310,280
2025	296,200
2026	57,300
2027	402,500
Thereafter	100,000
Total	$ 1,166,280

SUBORDINATED DEBT - Narrative (

SUBORDINATED DEBT - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Sep. 30, 2019	Dec. 31, 2017	Mar. 31, 2024
Subordinated Notes | Fixed-to-Floating Rate Subordinated Notes
Subordinated Borrowing [Line Items]
Debt instrument, face amount	$ 60	$ 40
Redemption price	100%	100%
Stated percentage	4.70%
Subordinated Notes | Fixed-to-Floating Rate Subordinated Notes | SOFR
Subordinated Borrowing [Line Items]
Basis spread on variable rate	3.13%
F&M Bancshares. Inc. | Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Debentures, period over which company may defer interest payments			5 years

SUBORDINATED DEBT - Summary of

SUBORDINATED DEBT - Summary of Pertinent Information Related to Junior Subordinated Debentures (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Subordinated Borrowing [Line Items]
Junior Subordinated Debenture Owed to Trust	$ 11,341
Junior Subordinated Debt | Farmers & Merchants Capital Trust II
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding	7,500
Junior Subordinated Debenture Owed to Trust	7,732
Junior Subordinated Debt | Farmers & Merchants Capital Trust III
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding	3,500
Junior Subordinated Debenture Owed to Trust	$ 3,609

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 6,759,000	$ 9,913,000
Effective income tax rate reconciliation	20.50%	21.10%
Unrecognized tax benefits, income tax penalties and interest expense	$ 0

STOCK BASED COMPENSATION - Narr

STOCK BASED COMPENSATION - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Oct. 01, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)			2,000,000
Shares reserved for issuance (in shares)	770,505
Share-based compensation expense	$ 2.8	$ 2.6
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 16.1
Weighted average period over which unrecognized compensation	2 years 14 days
Share awards granted (in shares)	263,000
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Weighted average period over which unrecognized compensation	2 years 1 month 20 days
Service period	1 year
Share awards granted (in shares)	77,624
Unrecognized compensation expense	$ 2.2

STOCK BASED COMPENSATION - Stoc

STOCK BASED COMPENSATION - Stock Option Plans Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Number of Options
Options outstanding, beginning balance (in shares)	258,000
Options granted (in shares)	0
Options exercised (in shares)	(22,000)
Options forfeited (in shares)	(4,000)
Options outstanding, ending balance (in shares)	232,000	258,000
Number of options vested and exercisable (in shares)	232,000
Weighted- Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 18.56
Options granted (in dollars per share)	0
Options exercised (in dollars per share)	(14.68)
Options forfeited (in dollars per share)	14.11
Options outstanding, ending balance (in dollars per share)	19.01	$ 18.56
Weighted Average Exercise Price, Options vested and exercisable (in dollars per share)	$ 19.01
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted Average Remaining Contractual Term, Options outstanding	2 years 7 days	2 years 1 month 2 days
Weighted Average Remaining Contractual Term, Options vested and exercisable	2 years 7 days
Aggregate Intrinsic Value, Options outstanding	$ 1,319	$ 2,398
Aggregate Intrinsic Value, Options vested and exercisable	$ 1,319

STOCK BASED COMPENSATION - Summ

STOCK BASED COMPENSATION - Summary of Restricted Stock Activity (Details) - Restricted Stock shares in Thousands	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Number of Shares
Nonvested share awards outstanding, beginning balance (in shares) | shares	458
Share awards granted (in shares) | shares	263
Share awards vested (in shares) | shares	(57)
Unvested share awards forfeited or cancelled (in shares) | shares	(1)
Nonvested share awards outstanding, ending balance (in shares) | shares	663
Weighted- Average Grant Date Fair Value
Nonvested share awards outstanding, beginning balance (in dollars per share) | $ / shares	$ 29.38
Share awards granted (in dollars per share) | $ / shares	23.31
Share awards vested (in dollars per share) | $ / shares	(25.99)
Unvested share awards forfeited or cancelled (in dollars per share) | $ / shares	(25.99)
Nonvested share awards outstanding, ending balance (in dollars per share) | $ / shares	$ 27.27

OFF-BALANCE SHEET ARRANGEMENT_3

OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Contractual Amounts of Financial Instruments With Off-balance Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	$ 309,465	$ 383,215
Variable Rate	1,276,153	1,447,460
Letters of credit, outstanding amount	1,170,000	1,820,000
Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	294,694	367,068
Variable Rate	1,251,493	1,425,946
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	14,771	16,147
Variable Rate	$ 24,660	$ 21,514

OFF-BALANCE SHEET ARRANGEMENT_4

OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Narrative (Details)	3 Months Ended
	Mar. 31, 2024
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to make loans, period	120 days
Off-balance-sheet fixed rate loan commitments, weighted average maturity	2 years 3 months 10 days
Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet fixed rate loan commitments, interest rate	1.80%
Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet fixed rate loan commitments, interest rate	13.50%
Weighted Average
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet fixed rate loan commitments, interest rate	6.59%

REGULATORY CAPITAL MATTERS - Ac

REGULATORY CAPITAL MATTERS - Actual and Required Capital (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Total Capital
Capital	$ 1,252,365	$ 1,221,060
Capital to Risk Weighted Assets	0.1462	0.1402
Capital Required for Capital Adequacy	$ 685,412	$ 696,529
Capital Required for Capital Adequacy to Risk Weighted Assets	0.0800	0.0800
Plus Capital Conservation Buffer	$ 899,603	$ 914,195
Plus Capital Conservation Buffer to Risk Weighted Assets	0.1050	0.1050
Common Equity Tier 1 Capital
Common Equity Tier 1 Risk Based Capital	$ 1,053,055	$ 1,025,076
Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets	0.1229	0.1177
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy	$ 385,544	$ 391,798
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	0.0450	0.0450
Plus Common Equity Tier 1 Risk Based Capital	$ 599,735	$ 604,463
Plus Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets	0.0700	0.0700
Tier 1 Capital (to risk-weighted assets)
Tier 1 Risk Based Capital	$ 1,062,953	$ 1,034,974
Tier 1 Risk Based Capital to Risk Weighted Assets	0.1241	0.1189
Tier 1 Risk Based Capital Required for Capital Adequacy	$ 514,059	$ 522,397
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	0.0600	0.0600
Plus Tier 1 Risk Based Capital	$ 728,250	$ 740,062
Plus Tier 1 Risk Based Capital to Risk Weighted Assets	0.0850	0.0850
Tier 1 Leverage (to average tangible assets)
Tier 1 Leverage Capital	$ 1,062,953	$ 1,034,974
Tier 1 Leverage Capital to Average Assets	0.1041	0.1018
Tier 1 Leverage Capital Required for Capital Adequacy	$ 408,273	$ 406,859
Tier 1 Leverage Capital Required for Capital Adequacy to Average Assets	0.0400	0.0400
Plus Tier 1 Leverage Capital	$ 408,273	$ 406,859
Plus Tier 1 Leverage Capital to Average Assets	0.0400	0.0400
Allegiance Bank
Total Capital
Capital	$ 1,208,772	$ 1,186,710
Capital to Risk Weighted Assets	0.1413	0.1365
Capital Required for Capital Adequacy	$ 684,604	$ 695,746
Capital Required for Capital Adequacy to Risk Weighted Assets	0.0800	0.0800
Plus Capital Conservation Buffer	$ 898,542	$ 913,167
Plus Capital Conservation Buffer to Risk Weighted Assets	0.1050	0.1050
Capital Required to be Well Capitalized	$ 855,755	$ 869,683
Capital Required to be Well Capitalized to Risk Weighted Assets	0.1000	0.1000
Common Equity Tier 1 Capital
Common Equity Tier 1 Risk Based Capital	$ 1,079,360	$ 1,060,624
Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets	0.1261	0.1220
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy	$ 385,090	$ 391,357
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	0.0450	0.0450
Plus Common Equity Tier 1 Risk Based Capital	$ 599,028	$ 608,778
Plus Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets	0.0700	0.0700
Common Equity Tier 1 Risk Based Capital Required to be Well Capitalized	$ 556,240	$ 565,294
Common Equity Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.0650	0.0650
Tier 1 Capital (to risk-weighted assets)
Tier 1 Risk Based Capital	$ 1,079,360	$ 1,060,624
Tier 1 Risk Based Capital to Risk Weighted Assets	0.1261	0.1220
Tier 1 Risk Based Capital Required for Capital Adequacy	$ 513,453	$ 521,810
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	0.0600	0.0600
Plus Tier 1 Risk Based Capital	$ 727,391	$ 739,231
Plus Tier 1 Risk Based Capital to Risk Weighted Assets	0.0850	0.0850
Tier 1 Risk Based Capital Required to be Well Capitalized	$ 684,604	$ 695,746
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.0800	0.0800
Tier 1 Leverage (to average tangible assets)
Tier 1 Leverage Capital	$ 1,079,360	$ 1,060,624
Tier 1 Leverage Capital to Average Assets	0.1059	0.1044
Tier 1 Leverage Capital Required for Capital Adequacy	$ 407,853	$ 406,453
Tier 1 Leverage Capital Required for Capital Adequacy to Average Assets	0.0400	0.0400
Plus Tier 1 Leverage Capital	$ 407,853	$ 406,453
Plus Tier 1 Leverage Capital to Average Assets	0.0400	0.0400
Tier 1 Leverage Capital Required to be Well Capitalized	$ 509,816	$ 508,066
Tier 1 Leverage Capital Required to be Well Capitalized to Average Assets	0.0500	0.0500

EARNINGS PER COMMON SHARE - Sum

EARNINGS PER COMMON SHARE - Summary of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income attributable to shareholders	$ 26,147	$ 37,148
Basic:
Weighted average shares outstanding (in shares)	53,343	53,021
Weighted average shares outstanding (in dollars per share)	$ 0.49	$ 0.70
Add incremental shares for:
Dilutive effect of stock option exercises and performance share units (in shares)	63	117
Total (in shares)	53,406	53,138
Total (in dollars per share)	$ 0.49	$ 0.70

EARNINGS PER COMMON SHARE - Nar

EARNINGS PER COMMON SHARE - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	101,166	6,807