BancFirst (BANF) 10-Q 6 Aug 24 2024 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2024	Jul. 31, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Trading Symbol	BANF
Entity Registrant Name	BancFirst Corporation
Entity Central Index Key	0000760498
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, $1.00 Par Value Per Share
Security Exchange Name	NASDAQ
Entity File Number	0-14384
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1221379
Entity Address, Address Line One	100 N. Broadway Ave.
Entity Address, City or Town	Oklahoma City
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	73102-8405
City Area Code	405
Local Phone Number	270-1086
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		33,022,124

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks	$ 194,273	$ 225,462
Interest-bearing deposits with banks	2,299,019	2,172,001
Federal funds sold	1,102	1,316
Debt securities held for investment (fair value: $838 and $1,190, respectively)	838	1,190
Debt securities available for sale at fair value	1,440,527	1,553,905
Loans held for sale	7,408	3,489
Loans held for investment (net of unearned interest)	8,047,448	7,656,645
Allowance for credit losses	(99,626)	(96,800)
Loans, net of allowance for credit losses	7,947,822	7,559,845
Premises and equipment, net	285,131	278,594
Other real estate owned	37,823	33,718
Intangible assets, net	14,931	16,704
Goodwill	182,263	182,263
Accrued interest receivable and other assets	326,181	343,555
Total assets	12,737,318	12,372,042
Deposits:
Noninterest-bearing	3,815,818	3,982,226
Interest-bearing	7,199,784	6,717,896
Total deposits	11,015,602	10,700,122
Short-term borrowings	4,264	3,351
Accrued interest payable and other liabilities	118,831	148,577
Subordinated debt	86,129	86,101
Total liabilities	11,224,826	10,938,151
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 33,022,124 and 32,933,018, respectively	33,022	32,933
Capital surplus	178,806	174,695
Retained earnings	1,348,905	1,276,305
Accumulated other comprehensive loss, net of tax benefit of $14,938 and $15,473, respectively	(48,241)	(50,042)
Total stockholders' equity	1,512,492	1,433,891
Total liabilities and stockholders' equity	12,737,318	12,372,042
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities, fair value	$ 838	$ 1,190
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	33,022,124	32,933,018
Common stock, shares outstanding	33,022,124	32,933,018
Accumulated other comprehensive loss, net of tax benefit	$ 14,938	$ 15,473
Senior Preferred Stock [Member]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Cumulative Preferred Stock [Member]
Preferred stock, par value	$ 5	$ 5
Preferred stock, shares authorized	900,000	900,000
Preferred stock, shares issued	0	0

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
INTEREST INCOME
Loans, including fees	$ 137,710	$ 114,612	$ 269,836	$ 219,008
Securities:
Taxable	8,932	9,408	18,113	18,399
Tax-exempt	18	23	38	30
Federal funds sold	5	81	24	113
Interest-bearing deposits with banks	31,800	26,694	62,097	58,714
Total interest income	178,465	150,818	350,108	296,264
INTEREST EXPENSE
Deposits	67,479	43,732	131,892	78,909
Short-term borrowings	59	129	155	212
Subordinated debt	1,031	1,031	2,061	2,061
Total interest expense	68,569	44,892	134,108	81,182
Net interest income	109,896	105,926	216,000	215,082
Provision for credit losses	3,358	2,824	7,373	5,146
Net interest income after provision for credit losses	106,538	103,102	208,627	209,936
NONINTEREST INCOME
Securities transactions	317	110	50	(103)
Sales of loans	733	757	1,224	1,361
Insurance commissions	6,668	6,225	16,123	14,966
Cash management	9,149	7,927	17,800	14,661
Gain/(loss) on sale of other assets	55	315	(4)	794
Other	4,252	5,782	9,365	11,812
Total noninterest income	43,944	47,974	88,844	95,802
NONINTEREST EXPENSE
Salaries and employee benefits	51,928	49,803	103,456	99,055
Occupancy, net	5,233	5,118	10,439	10,101
Depreciation	4,504	4,769	9,060	9,412
Amortization of intangible assets	887	880	1,773	1,760
Data processing services	2,696	2,217	5,312	4,324
Net expense from other real estate owned	1,656	2,889	3,858	5,348
Marketing and business promotion	2,246	1,900	4,502	4,427
Deposit insurance	1,614	1,463	3,052	3,076
Other	14,552	12,071	26,643	23,924
Total noninterest expense	85,316	81,110	168,095	161,427
Income before taxes	65,166	69,966	129,376	144,311
Income tax expense	14,525	14,956	28,401	31,768
Net income	$ 50,641	$ 55,010	$ 100,975	$ 112,543
NET INCOME PER COMMON SHARE
Basic	$ 1.53	$ 1.67	$ 3.06	$ 3.42
Diluted	$ 1.51	$ 1.64	$ 3.01	$ 3.36
OTHER COMPREHENSIVE GAIN/(LOSS)
Unrealized income/(loss) on debt securities, net of tax (expense)/benefit of $(1,263), $4,350, $(535) and $(154), respectively	$ 4,105	$ (14,091)	$ 1,801	$ 558
Other comprehensive income/(loss), net of tax (expense)/benefit of $(1,263), $4,350, $(535) and $(154), respectively	4,105	(14,091)	1,801	558
Comprehensive income	54,746	40,919	102,776	113,101
Trust Revenue [Member]
NONINTEREST INCOME
Revenue	5,490	4,590	10,578	8,812
Service Charges on Deposits [Member]
NONINTEREST INCOME
Revenue	$ 17,280	$ 22,268	$ 33,708	$ 43,499

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Unrealized (losses)/gains on debt securities, net of tax benefit/(expense)	$ (1,263)	$ 4,350	$ (535)	$ (154)
Other comprehensive (loss)/gain, net of tax benefit/(expense)	$ (1,263)	$ 4,350	$ (535)	$ (154)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	COMMON STOCK [Member]	CAPITAL SURPLUS [Member]	RETAINED EARNINGS [Member]	ACCUMULATED OTHER COMPREHENSIVE LOSS [Member]
Balance at beginning of period at Dec. 31, 2022		$ 32,876	$ 169,231	$ 1,120,292	$ (71,563)
Shares issued for stock options		63	1,914
Net income	$ 112,543			112,543
Dividends on common stock				(26,336)
Stock-based compensation arrangements			1,213
Net change					558
Balance at end of period at Jun. 30, 2023	1,340,791	32,939	172,358	1,206,499	(71,005)
Balance at beginning of period at Mar. 31, 2023		32,900	170,231	1,164,665	(56,914)
Shares issued for stock options		39	1,296
Net income	55,010			55,010
Dividends on common stock				(13,176)
Stock-based compensation arrangements			831
Net change					(14,091)
Balance at end of period at Jun. 30, 2023	1,340,791	32,939	172,358	1,206,499	(71,005)
Balance at beginning of period at Dec. 31, 2023	1,433,891	32,933	174,695	1,276,305	(50,042)
Shares issued for stock options		89	2,476
Net income	100,975			100,975
Dividends on common stock				(28,375)
Stock-based compensation arrangements			1,635
Net change					1,801
Balance at end of period at Jun. 30, 2024	1,512,492	33,022	178,806	1,348,905	(48,241)
Balance at beginning of period at Mar. 31, 2024		32,967	176,227	1,312,464	(52,346)
Shares issued for stock options		55	1,659
Net income	50,641			50,641
Dividends on common stock				(14,200)
Stock-based compensation arrangements			920
Net change					4,105
Balance at end of period at Jun. 30, 2024	$ 1,512,492	$ 33,022	$ 178,806	$ 1,348,905	$ (48,241)

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
RETAINED EARNINGS [Member]
Dividend on common stock	$ 0.43	$ 0.40	$ 0.86	$ 0.80

Consolidated Statements of Cash

Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 100,975	$ 112,543
Adjustments to reconcile to net cash provided by operating activities:
Provision for credit losses	7,373	5,146
Depreciation and amortization	10,833	11,172
Net amortization of securities premiums and discounts	(627)	(577)
Realized securities (gains)/losses	(50)	103
Gain on sales of loans	(1,224)	(1,361)
Cash receipts from the sale of loans originated for sale	110,096	77,758
Cash disbursements for loans originated for sale	(72,791)	(78,948)
Deferred income tax benefit	(1,764)	(1,489)
Gain on sale of other assets	(1,319)	(1,061)
Increase in interest receivable	(3,074)	(3,387)
Increase in interest payable	5,314	3,005
Amortization of stock-based compensation arrangements	1,635	1,213
Excess tax benefit from stock-based compensation arrangements	(750)	(734)
Other, net	11,848	5,797
Net cash provided by operating activities	166,475	129,180
INVESTING ACTIVITIES
Net decrease/(increase) in federal funds sold	214	(1,631)
Purchases of available for sale debt securities	(270)	(94,112)
Proceeds from maturities, calls and paydowns of held for investment debt securities	352	1,349
Proceeds from maturities, calls and paydowns of available for sale debt securities	116,611	64,036
Purchase of equity securities	(404)	(294)
Proceeds from paydowns and sales of equity securities	206	531
Net change in loans	(445,920)	(357,140)
Net (payments)/receipts on derivative asset contracts	(22,293)	11,628
Purchases of premises, equipment and computer software	(16,273)	(13,016)
Purchase of tax credits	(2,469)	(3,813)
Other, net	8,978	23,302
Net cash used in investing activities	(361,268)	(369,160)
FINANCING ACTIVITIES
Net change in deposits	315,480	(499,048)
Net change in short-term borrowings	913	3,593
Issuance of common stock in connection with stock options, net	2,565	1,977
Cash dividends paid	(28,336)	(26,310)
Net cash provided by (used in) financing activities	290,622	(519,788)
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	95,829	(759,768)
Cash, due from banks and interest-bearing deposits at the beginning of the period	2,397,463	3,168,910
Cash, due from banks and interest-bearing deposits at the end of the period	2,493,292	2,409,142
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	128,794	78,176
Cash paid during the period for income taxes	22,349	31,180
Noncash investing and financing activities:
Unpaid common stock dividends declared	$ 14,200	$ 13,176

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Description of Business and Summary of Significant Accounting Policies	(1) DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The accounting and reporting policies of BancFirst Corporation and its subsidiaries (the “Company”) conform to accounting principles generally accepted in the United States of America (U.S. GAAP) and general practice within the banking industry. A summary of significant accounting policies can be found in Note (1) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Basis of Presentation The accompanying unaudited interim consolidated financial statements include the accounts of BancFirst Corporation, Council Oak Partners, LLC, BancFirst Insurance Services, Inc., Pegasus Bank ("Pegasus"), Worthington Bank ("Worthington") and BancFirst and its subsidiaries ("BancFirst"). The principal operating subsidiaries of BancFirst are BFTower, LLC, BFC-PNC LLC, and BancFirst Agency, Inc. All significant intercompany accounts and transactions have been eliminated. Assets held in a fiduciary or agency capacity are not assets of the Company and, accordingly, are not included in the unaudited interim consolidated financial statements. The accompanying unaudited interim consolidated financial statements and notes are presented in accordance with U.S. GAAP for interim financial information and the instructions for Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). The information contained in the consolidated financial statements and footnotes included in BancFirst Corporation’s Annual Report on Form 10-K for the year ended December 31, 2023, should be referred to in connection with these unaudited interim consolidated financial statements. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. The unaudited interim consolidated financial statements contained herein reflect all adjustments, which are, in the opinion of management, necessary to provide a fair statement of the financial position and results of operations of the Company for the interim periods presented. All such adjustments are of a normal and recurring nature. Reclassifications Certain items in prior consolidated financial statements have been reclassified to conform to the current presentation. Such reclassifications had no effect on previously reported cash flows, stockholders’ equity or comprehensive income. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States inherently involves the use of estimates and assumptions that affect the amounts reported in the financial statements and the related disclosures. These estimates relate principally to the determination of the allowance for credit losses, income taxes, the fair value of financial instruments and the valuation of assets and liabilities acquired in a business combination, including identifiable intangible assets. Such estimates and assumptions may change over time and actual amounts realized may differ from those reported. Recent Accounting Pronouncements Standards Not Yet Adopted: In December 2023, the Financial Accounting Standards Board (“FASB“) issued Accounting Standards Update (“ASU”) No. 2023-09, “Income Taxes - Improvements to Income Tax Disclosures” requiring enhancements and further transparency to certain income tax disclosures, most notably the tax rate reconciliation and income taxes paid. This ASU is effective for fiscal years beginning after December 15, 2024 on a prospective basis and retrospective application is permitted. The Company does not expect adoption of the standard to have a material impact on its consolidated financial statements. In November 2023, the FASB issued ASU 2023-07, “Segment Reporting - Improvements to Reportable Segment Disclosures” requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more decision-useful financial analyses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024 on a retrospective basis. The amendments are to be applied retrospectively to all periods presented and segment expense categories are required to be based on the categories identified at adoption. The Company is currently evaluating the provisions of this ASU and expects to adopt them for the year ending December 31, 2024. The Company does no t expect the adoption to have a significant impact on the Company’s consolidated financial statements.

Securities

Securities	6 Months Ended
	Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Securities	(2) SECURITIES The following table summarizes the amortized cost and estimated fair values of debt securities held for investment: Amortized Gross Gross Estimated June 30, 2024 (Dollars in thousands) Mortgage backed securities (1) $ 3 $ — $ — $ 3 States and political subdivisions 335 — — 335 Other securities 500 — — 500 Total $ 838 $ — $ — $ 838 December 31, 2023 Mortgage backed securities (1) $ 5 $ — $ — $ 5 States and political subdivisions 685 — — 685 Other securities 500 — — 500 Total $ 1,190 $ — $ — $ 1,190 The following table summarizes the amortized cost and estimated fair values of debt securities available for sale: Amortized Gross Gross Estimated June 30, 2024 (Dollars in thousands) U.S. treasuries $ 1,450,915 $ — $ ( 60,133 ) $ 1,390,782 U.S. federal agencies 9,565 121 ( 3 ) 9,683 Mortgage backed securities (1) 15,647 7 ( 1,746 ) 13,908 States and political subdivisions 10,078 8 ( 135 ) 9,951 Asset backed securities 9,338 43 — 9,381 Other securities 8,163 — ( 1,341 ) 6,822 Total $ 1,503,706 $ 179 $ ( 63,358 ) $ 1,440,527 December 31, 2023 U.S. treasuries $ 1,560,265 $ 415 $ ( 62,635 ) $ 1,498,045 U.S. federal agencies 11,631 142 ( 3 ) 11,770 Mortgage backed securities (1) 16,459 13 ( 1,677 ) 14,795 States and political subdivisions 10,108 16 ( 114 ) 10,010 Asset backed securities 12,794 — ( 282 ) 12,512 Other securities 8,163 — ( 1,390 ) 6,773 Total $ 1,619,420 $ 586 $ ( 66,101 ) $ 1,553,905 (1) Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies. The maturities of debt securities held for investment and available for sale are summarized in the following table using contractual maturities. Actual maturities may differ from contractual maturities due to obligations that are called or prepaid. For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been presented at their contractual maturity. June 30, 2024 December 31, 2023 Amortized Estimated Amortized Estimated (Dollars in thousands) Held for Investment Contractual maturity of debt securities: Within one year $ 275 $ 275 $ 350 $ 350 After one year but within five years 563 563 840 840 After five years but within ten years — — — — After ten years — — — — Total $ 838 $ 838 $ 1,190 $ 1,190 Available for Sale Contractual maturity of debt securities: Within one year $ 364,890 $ 358,962 $ 348,318 $ 341,645 After one year but within five years 1,097,339 1,043,120 1,223,529 1,167,973 After five years but within ten years 11,071 9,657 10,331 8,851 After ten years 30,406 28,788 37,242 35,436 Total debt securities $ 1,503,706 $ 1,440,527 $ 1,619,420 $ 1,553,905 The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law: June 30, 2024 December 31, 2023 (Dollars in thousands) Book value of pledged securities $ 910,357 $ 591,324 There were no sales of debt securities and therefore no proceeds from sales or realized securities gains or losses on available for sale debt securities for the six months ended June 30, 2024 or June 30, 2023. Realized gains/losses on debt and equity securities are reported as securities transactions within the noninterest income section of the consolidated statement of comprehensive income. The following table summarizes debt securities with unrealized losses, segregated by the duration of the unrealized loss, at June 30, 2024 and December 31, 2023 respectively: Less than 12 Months More than 12 Months Total Number of investments Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) June 30, 2024 Available for Sale U.S. treasuries 62 $ 90,084 $ 926 $ 1,300,697 $ 59,207 $ 1,390,781 $ 60,133 U.S. federal agencies 2 205 2 688 1 893 3 Mortgage backed securities 69 1,188 9 12,455 1,737 13,643 1,746 States and political subdivisions 8 867 3 1,871 132 2,738 135 Other securities 3 — — 6,822 1,341 6,822 1,341 Total 144 $ 92,344 $ 940 $ 1,322,533 $ 62,418 $ 1,414,877 $ 63,358 December 31, 2023 Available for Sale U.S. treasuries 68 $ 4,838 $ 90 $ 1,401,669 $ 62,545 $ 1,406,507 $ 62,635 U.S. federal agencies 3 1,100 3 — — 1,100 3 Mortgage backed securities 74 80 — 13,261 1,677 13,341 1,677 States and political subdivisions 6 306 4 1,847 110 2,153 114 Asset backed securities 1 — — 12,512 282 12,512 282 Other securities 3 — — 6,773 1,390 6,773 1,390 Total 155 $ 6,324 $ 97 $ 1,436,062 $ 66,004 $ 1,442,386 $ 66,101 The Company has the ability and intent to hold the debt securities classified as held for investment until they mature, at which time the Company will receive full value for the debt securities. Furthermore, as of June 30, 2024 and December 31, 2023 , the Company also had the ability and intent to hold the debt securities classified as available for sale for a period of time sufficient for a recovery of cost. The unrealized losses are due to increases in market interest rates over the yields available at the time the underlying debt securities were purchased. The fair value of those debt securities having unrealized losses is expected to recover as the securities approach their maturity date or repricing date, or if market yields for such investments decline. The Company has no intent or requirement to sell before the recovery of the unrealized loss; therefore, no impairment loss was realized in the Company’s consolidated statement of comprehensive income.

Loans Held for Investment and A

Loans Held for Investment and Allowance for Credit Losses on Loans	6 Months Ended
	Jun. 30, 2024
Receivables [Abstract]
Loans Held for Investment and Allowance for Credit Losses on Loans	(3) LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES ON LOANS Loans held for investment are summarized by portfolio segment as follows: June 30, 2024 December 31, 2023 (Dollars in thousands) Real estate: Commercial real estate owner occupied 954,942 960,944 Commercial real estate non-owner occupied 1,604,132 1,486,420 Construction and development < 60 months 680,807 642,643 Construction residential real estate < 60 months 288,900 283,486 Residential real estate first lien 1,335,124 1,258,744 Residential real estate all other 260,036 244,696 Agriculture 432,360 427,139 Commercial non-real estate 1,436,349 1,289,452 Consumer non-real estate 469,084 476,467 Oil and gas 585,714 586,654 Total (1) $ 8,047,448 $ 7,656,645 (1) Excludes accrued interest receivable of $ 42.8 million at June 30, 2024 and $ 39.4 million at December 31, 2023, that is recorded in accrued interest receivable and other assets. The C ompany's loans are currently 84 % held by BancFirst and 16 % held by Pegasus and Worthington. In addition, approximately 69 % of the Company's loans are secured by real estate. Credit risk on loans is managed through limits on amounts loaned to individual and related borrowers, underwriting standards and loan monitoring procedures. The amounts and types of collateral obtained, if any, to secure loans are based upon the Company’s underwriting standards and management’s credit evaluation. Collateral varies, but may include real estate, equipment, accounts receivable, inventory, livestock and/or securities. The Company’s interest in collateral is secured through filing mortgages and liens, or by possession of the collateral. The Company's portfolio segment descriptions and the weighted average remaining life of portfolio segments are disclosed in Note (5) to the Company's Annual Report on Form 10-K for the year ended December 31, 2023. Other Real Estate Owned and Repossessed Assets and Loan Modifications The following is a summary of other real estate owned and repossessed assets: June 30, 2024 December 31, 2023 (Dollars in thousands) Other real estate owned and repossessed assets $ 38,497 $ 34,200 As of both June 30, 2024 and December 31, 2023, other real estate owned included a commercial real estate property recorded at approximately $ 30.7 million and $ 29.4 m illion, respectively. The increase in OREO and this commercial real estate property was due to tenant improvements during the six months ended June 30, 2024. Rental income for this property is included in other noninterest income on the consolidated statements of comprehensive income. Operating expense for this property is included in net expense from other real estate owned in noninterest expense on the consolidated statements of comprehensive income. This property had the following rental income and operating expenses for the periods presented. Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands) Rental income $ 3,085 $ 2,778 $ 6,026 $ 5,468 Operating expense 2,673 2,967 4,923 5,348 During the six months ended June 30, 2024, the Company sold property held in other real estate owned for a total gain of $ 1.3 million, compared to a total gain of $ 266,000 in the six months ended June 30, 2023. The Company charges interest on principal balances outstanding on modified loans during deferral periods. The current and future financial effects of the recorded balance of loans considered to be modified during the period were not considered to be material. The recorded balance of loans modified during the six months ended June 30, 2024 was approximately $ 5.9 million compared to $ 5.3 million during the year ended December 31, 2023. Nonaccrual loans The Company did no t recognize any interest income on nonaccrual loans for either the six months ended June 30, 2024 or 2023. In addition, all loans identified as nonaccrual loans have related allowances for credit losses at June 30, 2024 and December 31, 2023 , respectively. Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $ 1.8 million for the six months ended June 30, 2024 and approximately $ 718,000 for the six months ended June 30, 2023. Nonaccrual loans guaranteed by government agencies totaled approximately $ 8.5 million at June 30, 2024 and approximately $ 6.7 million at December 31, 2023. The following table is a summary of amounts included in nonaccrual loans, segregated by portfolio segment. June 30, 2024 December 31, 2023 (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 5,543 $ 1,686 Commercial real estate non-owner occupied 3,280 874 Construction and development < 60 months 20,142 800 Construction residential real estate < 60 months 745 638 Residential real estate first lien 3,425 3,336 Residential real estate all other 628 899 Agriculture 2,092 3,662 Commercial non-real estate 5,605 10,101 Consumer non-real estate 685 449 Oil and gas 1,876 2,128 Total $ 44,021 $ 24,573 Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. The following table presents an age analysis of the Company's loans held for investment: Age Analysis of Past Due Loans 30-59 60-89 90 Days Total Current Total Loans Accruing (Dollars in thousands) As of June 30, 2024 Real estate: Commercial real estate owner occupied $ 3,020 $ 38 $ 5,379 $ 8,437 $ 946,505 $ 954,942 $ 532 Commercial real estate non-owner occupied — 141 1,544 1,685 1,602,447 1,604,132 803 Construction and development < 60 months 405 1,738 831 2,974 677,833 680,807 31 Construction residential real estate < 60 months 229 117 407 753 288,147 288,900 — Residential real estate first lien 4,929 2,144 2,213 9,286 1,325,838 1,335,124 961 Residential real estate all other 866 152 835 1,853 258,183 260,036 250 Agriculture 1,805 937 1,447 4,189 428,171 432,360 916 Commercial non-real estate 1,857 831 5,256 7,944 1,428,405 1,436,349 587 Consumer non-real estate 3,166 555 495 4,216 464,868 469,084 200 Oil and gas 588 416 — 1,004 584,710 585,714 — Total $ 16,865 $ 7,069 $ 18,407 $ 42,341 $ 8,005,107 $ 8,047,448 $ 4,280 As of December 31, 2023 Real estate: Commercial real estate owner occupied $ 1,386 $ 26 $ 5,598 $ 7,010 $ 953,934 $ 960,944 $ 4,377 Commercial real estate non-owner occupied 2,224 7,371 1,786 11,381 1,475,039 1,486,420 913 Construction and development < 60 months 198 158 800 1,156 641,487 642,643 — Construction residential real estate < 60 months 1,542 206 405 2,153 281,333 283,486 332 Residential real estate first lien 3,879 1,204 1,849 6,932 1,251,812 1,258,744 731 Residential real estate all other 757 190 613 1,560 243,136 244,696 549 Agriculture 1,694 724 1,227 3,645 423,494 427,139 579 Commercial non-real estate 1,501 436 10,028 11,965 1,277,487 1,289,452 1,714 Consumer non-real estate 3,248 1,090 594 4,932 471,535 476,467 347 Oil and gas — — 92 92 586,562 586,654 — Total $ 16,429 $ 11,405 $ 22,992 $ 50,826 $ 7,605,819 $ 7,656,645 $ 9,542 Credit Quality Indicators The Company considers credit quality indicators to monitor the credit risk in the loan portfolio including volume and severity of loan delinquencies, nonaccrual loans, internal grading of loans, historical credit loss experience and economic conditions. These indicators are reviewed and updated regularly throughout the year. An internal risk grading system is used to indicate the credit risk of loans. The loan grades used by the Company are for internal risk identification purposes and do not directly correlate to regulatory categories or any financial reporting definitions. The general characteristics of the risk grades and the table summarizing the Company’s gross loans held for investment by year of origination and internally assigned credit grades as of December 31, 2023, are disclosed in Note (5) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The Company’s revolving loans that are converted to term loans are not material and therefore have not been presented. The following table summarizes the Company’s gross loans held for investment by year of origination and internally assigned credit grades: Term Loans Amortized Cost Basis by Origination Year Revolving Loans (Dollars in thousands) 2024 2023 2022 2021 2020 Prior Amortized Cost Basis Total As of June 30, 2024 Commercial real estate owner occupied Grade 1 $ 39,257 $ 104,695 $ 151,859 $ 111,308 $ 78,999 $ 186,219 $ 25,667 $ 698,004 Grade 2 23,094 34,818 49,139 44,044 21,710 34,604 24,187 231,596 Grade 3 128 7,339 3,574 4,489 939 4,121 2,100 22,690 Grade 4 — 372 21 170 352 1,615 122 2,652 Total commercial real estate owner occupied 62,479 147,224 204,593 160,011 102,000 226,559 52,076 954,942 Commercial real estate non-owner occupied Grade 1 $ 64,168 $ 258,439 $ 283,026 $ 187,391 $ 120,052 $ 126,177 $ 41,093 $ 1,080,346 Grade 2 61,660 104,871 126,693 89,290 38,105 71,591 3,122 495,332 Grade 3 8,934 141 13,635 1,690 — 245 — 24,645 Grade 4 185 2,043 643 316 98 524 — 3,809 Total commercial real estate non-owner occupied 134,947 365,494 423,997 278,687 158,255 198,537 44,215 1,604,132 Construction and development < 60 months Grade 1 $ 49,830 $ 76,166 $ 146,196 $ 33,350 $ 9,848 $ 7,591 $ 51,139 $ 374,120 Grade 2 64,768 118,553 62,487 8,296 1,590 14,969 10,703 281,366 Grade 3 2,641 1,829 — 354 71 68 19,287 24,250 Grade 4 — — 831 100 140 — — 1,071 Total construction and development < 60 months 117,239 196,548 209,514 42,100 11,649 22,628 81,129 680,807 Construction residential real estate < 60 months Grade 1 $ 78,419 $ 48,981 $ 15,922 $ 8,162 $ 98 $ 546 $ 30,001 $ 182,129 Grade 2 54,233 33,153 2,447 15 12 — 11,630 101,490 Grade 3 3,503 408 — — — — 396 4,307 Grade 4 568 200 206 — — — — 974 Total construction residential real estate < 60 months 136,723 82,742 18,575 8,177 110 546 42,027 288,900 Residential real estate first lien Grade 1 $ 134,305 $ 211,033 $ 205,048 $ 162,128 $ 130,865 $ 192,862 $ 5,031 $ 1,041,272 Grade 2 43,810 65,488 50,368 37,025 25,620 48,645 519 271,475 Grade 3 1,453 2,576 3,098 2,835 1,821 5,562 — 17,345 Grade 4 907 646 312 795 539 1,756 — 4,955 Grade 5 — 77 — — — — — 77 Total residential real estate first lien 180,475 279,820 258,826 202,783 158,845 248,825 5,550 1,335,124 Residential real estate all other Grade 1 $ 18,801 $ 34,325 $ 21,028 $ 6,512 $ 7,196 $ 12,957 $ 54,939 $ 155,758 Grade 2 3,804 5,198 4,467 1,341 1,462 3,918 79,266 99,456 Grade 3 756 344 106 176 295 437 1,507 3,621 Grade 4 — 174 67 — — 26 934 1,201 Total residential real estate all other 23,361 40,041 25,668 8,029 8,953 17,338 136,646 260,036 Agriculture Grade 1 $ 26,725 $ 36,340 $ 44,928 $ 31,695 $ 22,757 $ 46,282 $ 46,588 $ 255,315 Grade 2 23,833 21,355 20,788 16,052 9,606 19,830 39,081 150,545 Grade 3 5,833 8,951 1,119 1,076 2,589 3,072 1,686 24,326 Grade 4 354 886 612 51 5 262 4 2,174 Total Agriculture 56,745 67,532 67,447 48,874 34,957 69,446 87,359 432,360 Commercial non-real estate Grade 1 $ 98,481 $ 135,724 $ 155,712 $ 132,447 $ 28,731 $ 58,159 $ 421,728 $ 1,030,982 Grade 2 57,646 94,429 30,313 20,608 5,593 6,885 176,353 391,827 Grade 3 1,471 2,160 2,183 1,035 235 250 2,637 9,971 Grade 4 787 364 793 255 508 116 563 3,386 Grade 5 — — — 6 — 177 — 183 Total commercial non-real estate 158,385 232,677 189,001 154,351 35,067 65,587 601,281 1,436,349 Consumer non-real estate Grade 1 $ 105,282 $ 153,775 $ 77,329 $ 40,937 $ 11,724 $ 6,655 $ 12,793 $ 408,495 Grade 2 9,876 17,288 10,906 5,582 1,542 1,219 6,427 52,840 Grade 3 1,059 1,839 1,641 1,119 274 276 15 6,223 Grade 4 198 556 314 282 104 68 4 1,526 Total consumer non-real estate 116,415 173,458 90,190 47,920 13,644 8,218 19,239 469,084 Oil and gas Grade 1 $ 76,512 $ 63,488 $ 5,807 $ 26,153 $ 5,951 $ 3,116 $ 269,441 $ 450,468 Grade 2 60,737 9,097 5,045 677 374 267 58,161 134,358 Grade 3 29 109 — 183 — — — 321 Grade 4 — — — 127 — 440 — 567 Total oil and gas 137,278 72,694 10,852 27,140 6,325 3,823 327,602 585,714 Total loans held for investment $ 1,124,047 $ 1,658,230 $ 1,498,663 $ 978,072 $ 529,805 $ 861,507 $ 1,397,124 $ 8,047,448 The following tables summarize the Company's gross charge-offs by year of origination for the periods indicated: Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2024 2023 2022 2021 2020 Prior Amortized Cost Basis Total (Dollars in thousands) Three months ended June 30, 2024 Commercial real estate owner occupied Current-period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate non-owner occupied Current-period gross charge-offs — — — 1 — — — 1 Construction and development < 60 months Current-period gross charge-offs — — — — — — — — Construction residential real estate < 60 months Current-period gross charge-offs — — — — — — — — Residential real estate first lien Current-period gross charge-offs 2 23 — 2 4 36 — 67 Residential real estate all other Current-period gross charge-offs — — — — — — — — Agriculture Current-period gross charge-offs — — 6 13 — — — 19 Commercial non-real estate Current-period gross charge-offs 6 155 43 8 — 190 378 780 Consumer non-real estate Current-period gross charge-offs 21 256 150 28 21 30 4 510 Oil and gas Current-period gross charge-offs — — — — — — — — Total current-period gross charge-offs $ 29 $ 434 $ 199 $ 52 $ 25 $ 256 $ 382 $ 1,377 Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2023 2022 2021 2020 2019 Prior Amortized Cost Basis Total (Dollars in thousands) Three months ended June 30, 2023 Commercial real estate owner occupied Current-period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate non-owner occupied Current-period gross charge-offs — — — — — — — — Construction and development < 60 months Current-period gross charge-offs — — — 2 — — — 2 Construction residential real estate < 60 months Current-period gross charge-offs — — — — — — — — Residential real estate first lien Current-period gross charge-offs — — 19 21 — 2 — 42 Residential real estate all other Current-period gross charge-offs — 2 — — — — — 2 Agriculture Current-period gross charge-offs — — — 301 1 — — 302 Commercial non-real estate Current-period gross charge-offs 42 34 1 20 — 5 — 102 Consumer non-real estate Current-period gross charge-offs 29 186 115 14 28 11 15 398 Oil and gas Current-period gross charge-offs — 2 — — — — — 2 Total current-period gross charge-offs $ 71 $ 224 $ 135 $ 358 $ 29 $ 18 $ 15 $ 850 Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2024 2023 2022 2021 2020 Prior Amortized Cost Basis Total (Dollars in thousands) Six months ended June 30, 2024 Commercial real estate owner occupied Current-period gross charge-offs $ — $ — $ — $ 15 $ — $ — $ — $ 15 Commercial real estate non-owner occupied Current-period gross charge-offs — 12 — 1 1 — — 14 Construction and development < 60 months Current-period gross charge-offs — — — — — — — — Construction residential real estate < 60 months Current-period gross charge-offs — 3 — — — — — 3 Residential real estate first lien Current-period gross charge-offs 3 23 — 3 4 57 — 90 Residential real estate all other Current-period gross charge-offs — — — — — 2 27 29 Agriculture Current-period gross charge-offs — — 37 13 — — — 50 Commercial non-real estate Current-period gross charge-offs 6 1,156 318 140 12 316 1,886 3,834 Consumer non-real estate Current-period gross charge-offs 21 500 247 79 34 45 15 941 Oil and gas Current-period gross charge-offs — 9 83 — — — — 92 Total current-period gross charge-offs $ 30 $ 1,703 $ 685 $ 251 $ 51 $ 420 $ 1,928 $ 5,068 Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2023 2022 2021 2020 2019 Prior Amortized Cost Basis Total (Dollars in thousands) Six months ended June 30, 2023 Commercial real estate owner occupied Current-period gross charge-offs $ — $ 7 $ 1 $ 22 $ 18 $ — $ — $ 48 Commercial real estate non-owner occupied Current-period gross charge-offs — — — — — 3 — 3 Construction and development < 60 months Current-period gross charge-offs — 2 — 2 — — — 4 Construction residential real estate < 60 months Current-period gross charge-offs — — — — — — — — Residential real estate first lien Current-period gross charge-offs — — 19 21 — 4 — 44 Residential real estate all other Current-period gross charge-offs — 4 19 — 1 4 — 28 Agriculture Current-period gross charge-offs — 4 — 317 14 2 — 337 Commercial non-real estate Current-period gross charge-offs 42 101 63 20 — 52 — 278 Consumer non-real estate Current-period gross charge-offs 29 262 147 29 37 17 17 538 Oil and gas Current-period gross charge-offs — 2 — — — — — 2 Total current-period gross charge-offs $ 71 $ 382 $ 249 $ 411 $ 70 $ 82 $ 17 $ 1,282 Allowance for Credit Losses Methodology The Company determines its provision for credit losses and allowance for credit losses using the current expected credit loss methodology that is referred to as the current expected credit loss ("CECL") model. The allowance for current expected credit losses is measured on a collective (pool) basis when similar risk characteristics exist. The allowance for credit losses methodology is disclosed in Note (5) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The following tables detail activity in the allowance for credit losses on loans for the period presented. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Three Months Ended June 30, 2024 Real estate: Commercial real estate owner occupied $ 7,468 $ — $ 11 $ 11 $ ( 109 ) $ 7,370 Commercial real estate non-owner occupied 33,180 ( 1 ) — ( 1 ) 688 33,867 Construction and development < 60 months 6,596 — — — 184 6,780 Construction residential real estate < 60 months 3,464 — — — 55 3,519 Residential real estate first lien 4,923 ( 67 ) 21 ( 46 ) 695 5,572 Residential real estate all other 1,652 — 3 3 74 1,729 Agriculture 6,137 ( 19 ) 5 ( 14 ) ( 206 ) 5,917 Commercial non-real estate 20,482 ( 780 ) 280 ( 500 ) 1,493 21,475 Consumer non-real estate 4,335 ( 510 ) 58 ( 452 ) 500 4,383 Oil and gas 9,030 — — — ( 16 ) 9,014 Total $ 97,267 $ ( 1,377 ) $ 378 $ ( 999 ) $ 3,358 $ 99,626 Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Three Months Ended June 30, 2023 Real estate: Commercial real estate owner occupied $ 6,547 $ — $ 3 $ 3 $ 258 $ 6,808 Commercial real estate non-owner occupied 32,120 — — — 1,312 33,432 Construction and development < 60 months 3,608 ( 2 ) 3 1 ( 169 ) 3,440 Construction residential real estate < 60 months 3,226 — — — 327 3,553 Residential real estate first lien 4,454 ( 42 ) 10 ( 32 ) 333 4,755 Residential real estate all other 1,444 ( 2 ) 1 ( 1 ) 218 1,661 Agriculture 6,268 ( 302 ) 7 ( 295 ) 453 6,426 Commercial non-real estate 25,079 ( 102 ) 127 25 23 25,127 Consumer non-real estate 4,232 ( 398 ) 35 ( 363 ) 475 4,344 Oil and gas 7,782 ( 2 ) — ( 2 ) ( 406 ) 7,374 Total $ 94,760 $ ( 850 ) $ 186 $ ( 664 ) $ 2,824 $ 96,920 Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Six Months Ended June 30, 2024 Real estate: Commercial real estate owner occupied $ 7,483 $ ( 15 ) $ 31 $ 16 $ ( 129 ) $ 7,370 Commercial real estate non-owner occupied 33,080 ( 14 ) — ( 14 ) 801 33,867 Construction and development < 60 months 3,950 — — — 2,830 6,780 Construction residential real estate < 60 months 3,414 ( 3 ) — ( 3 ) 108 3,519 Residential real estate first lien 4,914 ( 90 ) 25 ( 65 ) 723 5,572 Residential real estate all other 1,646 ( 29 ) 8 ( 21 ) 104 1,729 Agriculture 6,137 ( 50 ) 17 ( 33 ) ( 187 ) 5,917 Commercial non-real estate 22,745 ( 3,834 ) 313 ( 3,521 ) 2,251 21,475 Consumer non-real estate 4,401 ( 941 ) 127 ( 814 ) 796 4,383 Oil and gas 9,030 ( 92 ) — ( 92 ) 76 9,014 Total $ 96,800 $ ( 5,068 ) $ 521 $ ( 4,547 ) $ 7,373 $ 99,626 Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Six Months Ended June 30, 2023 Real estate: Commercial real estate owner occupied $ 6,416 $ ( 48 ) $ 52 $ 4 $ 388 $ 6,808 Commercial real estate non-owner occupied 30,190 ( 3 ) — ( 3 ) 3,245 33,432 Construction and development < 60 months 3,778 ( 4 ) 6 2 ( 340 ) 3,440 Construction residential real estate < 60 months 3,275 — — — 278 3,553 Residential real estate first lien 4,092 ( 44 ) 13 ( 31 ) 694 4,755 Residential real estate all other 1,418 ( 28 ) 3 ( 25 ) 268 1,661 Agriculture 6,217 ( 337 ) 13 ( 324 ) 533 6,426 Commercial non-real estate 25,106 ( 278 ) 149 ( 129 ) 150 25,127 Consumer non-real estate 4,132 ( 538 ) 92 ( 446 ) 658 4,344 Oil and gas 8,104 ( 2 ) — ( 2 ) ( 728 ) 7,374 Total $ 92,728 $ ( 1,282 ) $ 328 $ ( 954 ) $ 5,146 $ 96,920 Purchased Credit Deteriorated Loans The Company has previously purchased loans, for which there was, at acquisition, evidence of more than insignificant deterioration of credit quality since origination. The Company did not purchase credit-deteriorated loans during the six months ended June 30, 2024 and 2023. Collateral Dependent Loans A loan is considered collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. During the six months ended June 30, 2024 and 2023, no material amount of interest income was recognized on collateral-dependent loans subsequent to their classification as collateral-dependent. The following tables summarize collateral-dependent gross loans held for investment by collateral type and the related specific allocation as follows: Collateral Type Real Estate Business Assets Other Assets Total Specific Allocation (Dollars in thousands) As of June 30, 2024 Real estate: Commercial real estate owner occupied $ — $ — $ — $ — $ — Commercial real estate non-owner occupied 643 — — 643 250 Construction and development < 60 months 20,142 — — 20,142 2,825 Construction residential real estate < 60 months 618 — — 618 134 Residential real estate first lien 195 — — 195 66 Residential real estate all other 79 — — 79 81 Agriculture 1,833 401 14 2,248 1,193 Commercial non-real estate — 4,140 87 4,227 1,342 Consumer non-real estate — — 236 236 133 Oil and gas — — — — — Total collateral-dependent loans held for investment $ 23,510 $ 4,541 $ 337 $ 28,388 $ 6,024 Collateral Type Real Estate Business Assets Other Assets Total Specific Allocation (Dollars in thousands) As of December 31, 2023 Real estate: Commercial real estate owner occupied $ — $ — $ — $ — $ — Commercial real estate non-owner occupied 632 — — 632 250 Construction and development < 60 months 800 — — 800 225 Construction residential real estate < 60 months 638 — — 638 134 Residential real estate first lien 189 — — 189 62 Residential real estate all other 140 — — 140 140 Agriculture 1,841 593 15 2,449 1,386 Commercial non-real estate — 6,090 241 6,331 1,867 Consumer non-real estate — — 147 147 88 Oil and gas — — — — — Total collateral-dependent loans held for investment $ 4,240 $ 6,683 $ 403 $ 11,326 $ 4,152 Non-Cash Transfers from Loans and Premises and Equipment Transfers from loans and premises and equipment to other real estate owned and repossessed assets are non-cash transactions, and are not included in the consolidated statements of cash flow. Transfers from loans and premises and equipment to other real estate owned and repossessed assets during the periods presented are summarized as follows: Six Months Ended June 30, 2024 2023 (Dollars in thousands) Other real estate owned $ 8,995 $ 667 Repossessed assets 1,575 946 Total $ 10,570 $ 1,613

Intangible Assets and Goodwill

Intangible Assets and Goodwill	6 Months Ended
	Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	(4) INTANGIBLE ASSETS AND GOODWILL The following is a summary of intangible assets as of the date listed: Gross Accumulated Net (Dollars in thousands) June 30, 2024 Core deposit intangibles $ 33,550 $ ( 18,741 ) $ 14,809 Customer relationship intangibles 3,350 ( 3,228 ) 122 Total $ 36,900 $ ( 21,969 ) $ 14,931 December 31, 2023 Core deposit intangibles $ 33,550 $ ( 17,027 ) $ 16,523 Customer relationship intangibles 3,350 ( 3,169 ) 181 Total $ 36,900 $ ( 20,196 ) $ 16,704 The following is a summary of goodwill by business segment: BancFirst Metropolitan Banks BancFirst Community Banks Pegasus Worthington Other Financial Services Executive, Operations & Support Consolidated (Dollars in thousands) Six months ended June 30, 2024 Balance at beginning and end of period $ 13,767 $ 61,420 $ 68,855 $ 32,133 $ 5,464 $ 624 $ 182,263 Additional information for intangible assets can be found in Note (7) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 .

Subordinated Debt

Subordinated Debt	6 Months Ended
	Jun. 30, 2024
Broker-Dealer [Abstract]
Subordinated Debt	(5) SUBORDINATED DEBT In January 2004, the Company established BFC Capital Trust II (“BFC II”), a trust formed under the Delaware Business Trust Act. The Company owns all of the common securities of BFC II. In February 2004, BFC II issued $ 25 million of aggregate liquidation amount of 7.20 % Cumulative Trust Preferred Securities (the “Cumulative Trust Preferred Securities”) to other investors. In March 2004, BFC II issued an additional $ 1 million in Cumulative Trust Preferred Securities through the execution of an over-allotment option. The Cumulative Trust Preferred Securities qualify as Tier 1 capital under regulatory guidelines. The proceeds from the sale of the Cumulative Trust Preferred Securities and the common securities of BFC II were invested in $ 26.8 million of 7.20 % Junior Subordinated Debentures of the Company. Interest payments on the $ 26.8 million of 7.20 % Junior Subordinated Debentures are payable January 15, April 15, July 15 and October 15 of each year . Such interest payments may be deferred for up to twenty consecutive quarters. The stated maturity date of the $ 26.8 million of 7.20 % Junior Subordinated Debentures is March 31, 2034 , but they are subject to mandatory redemption pursuant to optional prepayment terms. The Cumulative Trust Preferred Securities represent an undivided interest in the $ 26.8 million of 7.20 % Junior Subordinated Debentures and are guaranteed by the Company. During any deferral period or during any event of default, the Company may not declare or pay any dividends on any of its capital stock. The Cumulative Trust Preferred Securities have been callable at par, in whole or in part, since March 31, 2009. On June 17, 2021, the Company completed a private placement, under Regulation D of the Securities Act of 1933, of $ 60 million aggregate principal amount of 3.50 % Fixed-to-Floating Rate Subordinated Notes due 2036 (the “Subordinated Notes”) to various institutional accredited investors. The sale of the Subordinated Notes was pursuant to a Subordinated Note Purchase Agreement entered into with each of the investors. The Subordinated Notes qualify as Tier 2 capital under regulatory guidelines. The net proceeds to the Company from the sale of the Subordinated Notes were approximately $ 59.15 million net of commissions and offering expenses. The Company used the proceeds from the sale of the Subordinated Notes for general corporate purposes. The Subordinated Notes initially bear interest at a fixed rate of 3.50 % per annum, from and including June 17, 2021 to but excluding June 30, 2031, payable semi-annually in arrears on June 30 and December 31 of each year , commencing December 31, 2021 . Then, from and including June 30, 2031, to but excluding the maturity date, the Subordinated Notes will bear interest at a floating rate equal to the benchmark (initially, three-month term SOFR), reset quarterly, plus a spread of 229 basis points, payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year. The Subordinated Notes mature on June 30, 2036 . The Company may, at its option, beginning with the interest payment date of June 30, 2031, and on any scheduled interest payment date thereafter, redeem the Subordinated Notes, in whole or in part. In addition, the Company may redeem all, but not less than all, of the Subordinated Notes at any time upon the occurrence of a “Tier 2 Capital Event,” a “Tax Event” or an “Investment Company Event” (each as defined in the Subordinated Notes). Any such redemption is subject to obtaining the prior approval of the Board of Governors of the Federal Reserve System (or its designee). The redemption price with respect to any such redemption will be equal to 100 % of the principal amount of the Subordinated Note, or portion thereof, to be redeemed, plus accrued but unpaid interest, if any, thereon to, but excluding, the redemption date.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	(6) STOCK-BASED COMPENSATION On May 25, 2023, the shareholders of the Company adopted the BancFirst Corporation 2023 Restricted Stock Unit Plan (the "RSU Plan"). The RSU Plan was effective as of June 1, 2023 and for a period of ten years thereafter. The RSU Plan will continue in effect after such ten-year period until all matters relating to the payment of awards and administration of the RSU Plan have been settled. At June 30, 2024 there were 462,175 shares available for future grants. The restricted stock units ("RSU's") vest beginning two years from the date of grant at the rate of 20 % per year for five years . The RSUs are settled and distributed as of each vesting date. The fair value of each RSU granted is equal to the market price of the Company’s stock at the date of grant. The following table is a summary of the activity under the Company's RSU plan. Wgtd. Avg. Restricted Grant Date Stock Units Fair Value Six Months Ended June 30, 2024 Nonvested at December 31, 2023 32,075 $ 87.23 Granted 7,250 88.57 Forfeited ( 1,500 ) 83.61 Nonvested at June 30, 2024 37,825 87.63 The Company has had the BancFirst Corporation Directors’ Deferred Stock Compensation Plan (the “Deferred Stock Compensation Plan”) since May 1999. As of June 30, 2024 , there are 39,525 shares available for future issuance under the Deferred Stock Compensation Plan. The Deferred Stock Compensation Plan will terminate on December 31, 2030 , if not extended. Under the plan, directors and members of the community advisory boards of the Company and its subsidiaries may defer up to 100 % of their board fees. They are credited for each deferral with a number of stock units based on the current market price of the Company’s stock, which accumulate in an account until such time as the director or community board member terminates serving as a board member. Shares of common stock of the Company are then distributed to the terminating director or community board member based upon the number of stock units accumulated in his or her account. There were 5,022 and 17,797 shares of common stock distributed from the Deferred Stock Compensation Plan during the six months ended June 30, 2024 and 2023, respectively. A summary of the accumulated stock units under the Deferred Stock Compensation Plan is as follows: June 30, 2024 December 31, 2023 Accumulated stock units 119,115 119,575 Average price $ 42.43 $ 40.03 The Company terminated the BancFirst Corporation Stock Option Plan (the “Employee Plan”) on June 1, 2023 . The remaining options will continue to vest and are exercisable beginning four years from the date of grant at the rate of 25 % per year for four years , and expire no later than the end of fifteen years from the date of grant . The Company terminated the BancFirst Corporation Non-Employee Directors’ Stock Option Plan (the “Non-Employee Directors’ Plan”) on June 1, 2023 . The remaining options will continue to vest and are exercisable beginning one year from the date of grant at the rate of 25 % per year for four years , and expire no later than the end of fifteen years from the date of grant. The following table is a summary of the activity under both the Employee Plan and the Non-Employee Directors’ Plan: Wgtd. Avg. Wgtd. Avg. Remaining Aggregate Exercise Contractual Intrinsic Options Price Term Value (Dollars in thousands, except option data) Six Months Ended June 30, 2024 Outstanding at December 31, 2023 1,241,391 $ 53.12 Options exercised ( 84,084 ) 28.80 Options canceled, forfeited, or expired ( 12,000 ) 91.64 Outstanding at June 30, 2024 1,145,307 54.50 9.57 Yrs. $ 38,022 Exercisable at June 30, 2024 502,932 37.51 6.64 Yrs. $ 25,243 The following table has additional information regarding options exercised under both the Employee Plan and the Non-Employee Directors’ Plan: Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands) Total intrinsic value of options exercised $ 3,254 $ 1,979 $ 5,085 $ 2,331 Cash received from options exercised 1,714 1,318 2,422 1,539 Tax benefit realized from options exercised 782 475 1,222 560 The Company currently uses newly issued shares for stock option exercises, but reserves the right to use shares purchased under the Company’s Stock Repurchase Program (the “SRP”) in the future. Although not required or expected, the Company may settle some options or restricted stock units in cash on a limited basis at the discretion of the Company. The Company had no cash settlements during the six months ended June 30, 2024 or 2023. Stock-based compensation expense is charged to salaries and benefits expense on the Consolidated Statements of Comprehensive Income. The components of stock-based compensation expense for all share-based compensation plans and related tax benefits are as follows: Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands) Stock-based compensation expense $ 920 $ 831 $ 1,635 $ 1,213 Tax benefit 221 200 393 292 Stock-based compensation expense, net of tax $ 699 $ 631 $ 1,242 $ 921 The Company will continue to amortize the unearned stock-based compensation expense over the remaining weighted average vesting period of approximately five years for unvested stock options and six years for unvested RSUs. The following table shows the unearned stock-based compensation expense for unvested stock options and unvested RSUs: June 30, 2024 (Dollars in thousands) Unearned stock-based compensation expense for unvested stock options $ 8,769 Unearned stock-based compensation expense for unvested RSU's 2,940

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2024
Equity [Abstract]
Stockholders' Equity	(7) STOCKHOLDERS’ EQUITY The Company has adopted a Stock Repurchase Program (the “SRP”). The SRP may be used as a means to increase earnings per share and return on equity. In addition, the SRP may be used to purchase treasury stock for the exercise of stock options or for distributions under the Deferred Stock Compensation Plan, to provide liquidity for optionees to dispose of stock from exercises of their stock options and to provide liquidity for stockholders wishing to sell their stock. All shares repurchased under the SRP have been retired and not held as treasury stock. The timing, price and amount of stock repurchases under the SRP is determined by management and approved by the Company’s Executive Committee. The following table is a summary of the shares under the SRP: June 30, 2024 Shares remaining to be repurchased 479,784 BancFirst Corporation, BancFirst, Pegasus and Worthington are subject to risk-based capital guidelines issued by the Board of Governors of the Federal Reserve System and the Federal Deposit Insurance Corporation (“FDIC”). These guidelines are used to evaluate capital adequacy and involve both quantitative and qualitative evaluations of assets, liabilities and certain off-balance-sheet items calculated under regulatory practices. Failure to meet the minimum capital requirements can initiate certain mandatory or discretionary actions by the regulatory agencies that could have a direct material effect on the Company’s consolidated financial statements. The Company believes that as of June 30, 2024 , BancFirst Corporation, BancFirst, Pegasus and Worthington each met all capital adequacy requirements to which they are subject. The actual and required capital amounts and ratios are shown in the following table: Required To Be Well For Capital With Capitalized Under Adequacy Capital Conservation Prompt Corrective Actual Purposes Buffer Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) As of June 30, 2024: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,548,490 17.22 % $ 719,342 8.00 % $ 944,136 10.50 % N/A N/A BancFirst 1,224,212 16.09 % 608,791 8.00 % 799,039 10.50 % $ 760,989 10.00 % Pegasus 143,683 15.85 % 72,538 8.00 % 95,206 10.50 % 90,672 10.00 % Worthington 53,063 11.85 % 35,810 8.00 % 47,001 10.50 % 44,763 10.00 % Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,363,539 15.16 % $ 404,630 4.50 % $ 629,424 7.00 % N/A N/A BancFirst 1,119,672 14.71 % 342,445 4.50 % 532,693 7.00 % $ 494,643 6.50 % Pegasus 134,727 14.86 % 40,802 4.50 % 63,470 7.00 % 58,937 6.50 % Worthington 48,955 10.94 % 20,143 4.50 % 31,334 7.00 % 29,096 6.50 % Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,389,539 15.45 % $ 539,507 6.00 % $ 764,301 8.50 % N/A N/A BancFirst 1,139,672 14.98 % 456,594 6.00 % 646,841 8.50 % $ 608,791 8.00 % Pegasus 134,727 14.86 % 54,403 6.00 % 77,071 8.50 % 72,538 8.00 % Worthington 48,955 10.94 % 26,858 6.00 % 38,048 8.50 % 35,810 8.00 % Tier 1 Capital (to Quarterly Average Assets)- BancFirst Corporation $ 1,389,539 11.10 % $ 500,747 4.00 % N/A N/A N/A N/A BancFirst 1,139,672 10.69 % 426,413 4.00 % N/A N/A $ 533,017 5.00 % Pegasus 134,727 10.59 % 50,900 4.00 % N/A N/A 63,624 5.00 % Worthington 48,955 8.44 % 23,207 4.00 % N/A N/A 29,008 5.00 % As of June 30, 2024, BancFirst, Pegasus and Worthington were classified by the Federal Reserve as “well capitalized” under the prompt corrective action provisions. The Common Equity Tier 1 Capital of BancFirst Corporation, BancFirst, Pegasus and Worthington includes common stock and related paid-in capital and retained earnings. In connection with the adoption of the Basel III Capital Rules, the election was made to opt-out of the requirement to include most components of accumulated other comprehensive income in Common Equity Tier 1 Capital. Common Equity Tier 1 Capital for BancFirst Corporation, BancFirst, Pegasus and Worthington is reduced by goodwill and other intangible assets, net of associated deferred tax liabilities. The Company’s trust preferred securities qualify as Tier 1 capital and its Subordinated Notes qualify as Tier 2 capital. The Company's Subordinated Notes have been structured to qualify as Tier 2 capital under bank regulatory guidelines. BancFirst, Pegasus and Worthington have had no events or conditions that management believes would materially change their category under capital requirements existing as of the report dates.

Net Income Per Common Share

Net Income Per Common Share	6 Months Ended
	Jun. 30, 2024
Earnings Per Share [Abstract]
Net Income Per Common Share	(8) NET INCOME PER COMMON SHARE Basic and diluted net income per common share are calculated as follows: Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands, except per share data) (Numerator) Income available to common stockholders $ 50,641 $ 55,010 $ 100,975 $ 112,543 (Denominator) Weighted average shares outstanding for basic earnings per common share 33,001,180 32,920,497 32,974,582 32,906,753 Dilutive effect of stock compensation 523,881 546,757 545,665 559,178 Weighted-average shares outstanding for diluted earnings per common share 33,525,061 33,467,254 33,520,247 33,465,931 Basic earnings per share $ 1.53 $ 1.67 $ 3.06 $ 3.42 Diluted earnings per share $ 1.51 $ 1.64 $ 3.01 $ 3.36 The following table shows the number of options and RSU's that were excluded from the computation of diluted net income per common share for each period because they were anti-dilutive for the period: Shares Three Months Ended June 30, 2024 260,548 Three Months Ended June 30, 2023 305,407 Six Months Ended June 30, 2024 262,251 Six Months Ended June 30, 2023 307,608

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	(9) FAIR VALUE MEASUREMENTS Accounting standards define fair value as the price that would be received to sell an asset or the price paid to transfer a liability in the principal or most advantageous market available to the entity in an orderly transaction between market participants on the measurement date. FASB Accounting Standards Codification (“ASC”) Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: • Level 1 Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset and liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose values are determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant judgment or estimation. This category includes certain collaterally dependent loans, repossessed assets, other real estate owned, goodwill and other intangible assets. Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis A description of the valuation methodologies and key inputs used to measure financial assets and financial liabilities at fair value on a recurring basis, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to the following categories of the Company’s financial assets and financial liabilities. Debt Securities Available for Sale Debt securities classified as available for sale are reported at fair value. U.S. Treasuries are valued using Level 1 inputs. Other debt securities available for sale including U.S. federal agencies, registered mortgage backed debt securities and state and political subdivisions are valued using prices from an independent pricing service utilizing Level 2 data. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and a bond’s terms and conditions, among other things. The Company also invests in private label mortgage backed debt securities for which observable information is not readily available. These debt securities are reported at fair value utilizing Level 3 inputs. For these debt securities, management determines the fair value based on replacement cost, the income approach or information provided by outside consultants or lead investors. Discount rates are primarily based on reference to interest rate spreads on comparable debt securities of similar duration and credit rating as determined by the nationally recognized rating agencies adjusted for a lack of trading volume. Significant unobservable inputs are developed by investment securities professionals involved in the active trading of similar debt securities. The Company reviews the prices for Level 1 and Level 2 debt securities supplied by the independent pricing service for reasonableness and to ensure such prices are aligned with traditional pricing matrices. In general, the Company does not purchase investment portfolio debt securities that are esoteric or that have complicated structures. The Company’s portfolio primarily consists of traditional investments including U.S. Treasury obligations, federal agency mortgage pass-through debt securities, general obligation municipal bonds and municipal revenue bonds. Pricing for such instruments is easily obtained. For in-state bond issues that have relatively low issue sizes and liquidity, the Company utilizes the same parameters for pricing mentioned in the preceding paragraph adjusted for the specific issue. Periodically, the Company will validate prices supplied by the independent pricing service by comparison to prices obtained from third party sources. Derivatives Derivatives are reported at fair value utilizing Level 2 inputs. The Company obtains dealer and market quotations to value its oil and gas swaps and options. The Company utilizes dealer quotes and observable market data inputs to substantiate internal valuation models. The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of the periods presented, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Fair Value (Dollars in thousands) June 30, 2024 Debt securities available for sale: U.S. Treasury $ 1,390,782 $ — $ — $ 1,390,782 U.S. federal agencies — 9,683 — 9,683 Mortgage-backed securities — 13,908 — 13,908 States and political subdivisions — 9,801 150 9,951 Asset backed securities — 9,381 — 9,381 Other debt securities — 6,822 — 6,822 Derivative assets — 15,239 — 15,239 Derivative liabilities — 13,420 — 13,420 December 31, 2023 Debt securities available for sale: U.S. Treasury $ 1,498,045 $ — $ — $ 1,498,045 U.S. federal agencies — 11,770 — 11,770 Mortgage-backed securities — 14,795 — 14,795 States and political subdivisions — 9,830 180 10,010 Asset backed securities — 12,512 — 12,512 Other debt securities 6,773 6,773 Derivative assets — 41,099 — 41,099 Derivative liabilities — 39,176 — 39,176 The changes in Level 3 assets measured at estimated fair value on a recurring basis during the periods presented were as follows: Six Months Ended June 30, Twelve Months Ended December 31, 2024 2023 (Dollars in thousands) Balance at the beginning of the year $ 180 $ 454 Transfers to level 2 — ( 244 ) Settlements ( 30 ) ( 30 ) Balance at the end of the period $ 150 $ 180 The Company’s policy is to recognize transfers in and transfers out of Levels 1, 2 and 3 as of the end of the reporting period. During the six months ended June 30, 2024, the Company did not transfer any debt securities. During the year ended December 31, 2023, the Company transferred debt securities from Level 3 to Level 2 due to a review of the pricing models that determined some state and political subdivision securities to be Level 2. Financial Assets and Financial Liabilities Measured at Fair Value on a Nonrecurring Basis Certain financial assets and financial liabilities are measured at fair value on a nonrecurring basis; the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These financial assets and financial liabilities are reported at fair value utilizing Level 3 inputs. The Company invests in equity securities without readily determinable fair values and utilizes Level 3 inputs. These equity securities are reported at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The realized and unrealized gains and losses are reported as securities transactions in the noninterest income section of the consolidated statements of comprehensive income. Collateral dependent loans are reported at the fair value of the underlying collateral if repayment is dependent on liquidation of the collateral. When the Company determines that foreclosure is probable or when the borrower is experiencing financial difficulty at the reporting date and repayment is expected to be provided substantially through the operation or sale of the collateral, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. In no case does the fair value of a collateral dependent loan exceed the fair value of the underlying collateral. The collateral dependent loans are adjusted to fair value through a specific allocation of the allowance for credit losses or a direct charge-down of the loan. Repossessed assets, upon initial recognition, are measured and adjusted to fair value through a charge-off to the allowance for possible credit losses based upon the fair value of the repossessed asset. Other real estate owned is revalued at fair value subsequent to initial recognition, with any losses recognized in net expense from other real estate owned. The following table summarizes assets measured at fair value on a nonrecurring basis during the period presented. These nonrecurring fair values do not represent all assets, only those assets that have been adjusted during the reporting period: Total Fair Value Level 3 (Dollars in thousands) As of and for the Year-to-date Period Ended June 30, 2024 Equity securities $ 13,331 Collateral dependent loans 230 Repossessed assets 657 Other real estate owned 6,838 As of and for the Year-to-date Period Ended December 31, 2023 Equity securities $ 13,144 Collateral dependent loans 1,894 Repossessed assets 474 Other real estate owned 31,773 Estimated Fair Value of Financial Instruments The Company is required under current authoritative accounting guidance to disclose the estimated fair value of their financial instruments that are not recorded at fair value. For the Company, as for most financial institutions, substantially all of its assets and liabilities are considered financial instruments. A financial instrument is defined as cash, evidence of an ownership interest in an entity or a contract that creates a contractual obligation or right to deliver or receive cash or another financial instrument from a second entity. The following methods and assumptions are used to estimate the fair value of each class of financial instruments: Cash and Cash Equivalents Include: Cash and Due from Banks and Interest-Bearing Deposits with Banks The carrying amount of these short-term instruments is based on a reasonable estimate of fair value. Federal Funds Sold The carrying amount of these short-term instruments is a reasonable estimate of fair value. Debt Securities Held for Investment For debt securities held for investment, which are generally traded in secondary markets, fair values are based on quoted market prices or dealer quotes, if available. If a quoted market price is not available, fair value is estimated using quoted market prices for similar debt securities making adjustments for credit or liquidity if applicable. Loans Held For Sale The Company originates mortgage loans to be sold. At the time of origination, the acquiring bank has already been determined and the terms of the loan, including interest rate, have already been set by the acquiring bank, allowing the Company to originate the loan at fair value. Mortgage loans are generally sold within 30 days of origination. Loans held for sale are valued using Level 2 inputs. Gains or losses recognized upon the sale of the loans are determined on a specific identification basis. Loans Held For Investment To determine the fair value of loans held for investment, the Company uses an exit price calculation, which takes into account factors such as liquidity, credit and the nonperformance risk of loans. For certain homogeneous categories of loans, such as some residential mortgages, fair values are estimated using the quoted market prices for securities backed by similar loans, adjusted for differences in loan characteristics. The fair values of other types of loans are estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. Deposits The fair values of transaction and savings accounts are the amounts payable on demand at the reporting date. The fair values of fixed-maturity certificates of deposit are estimated using the rates currently offered for deposits of similar remaining maturities. Short-Term Borrowings The amounts payable on these short-term instruments are reasonable estimates of fair value. Subordinated Debt The fair values of subordinated debt are estimated using the rates that would be charged for subordinated debt of similar remaining maturities. Loan Commitments and Letters of Credit The fair values of commitments are estimated using the fees currently charged to enter into similar agreements, taking into account the terms of the agreements. The fair values of letters of credit are based on fees currently charged for similar agreements. The estimated fair values of the Company’s financial instruments that are reported at amortized cost in the Company’s consolidated balance sheets, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows: June 30, 2024 December 31, 2023 Carrying Fair Value Carrying Fair Value (Dollars in thousands) FINANCIAL ASSETS Level 2 inputs: Cash and cash equivalents $ 2,493,292 $ 2,493,292 $ 2,397,463 $ 2,397,463 Federal funds sold 1,102 1,102 $ 1,316 1,316 Debt securities held for investment 3 3 5 5 Loans held for sale 7,408 7,408 3,489 3,489 Level 3 inputs: Debt securities held for investment 835 835 1,185 1,185 Loans, net of allowance for credit losses 7,947,822 8,692,589 7,559,845 7,356,768 FINANCIAL LIABILITIES Level 2 inputs: Deposits 11,015,602 10,511,836 10,700,122 10,413,348 Short-term borrowings 4,264 4,264 3,351 3,351 Subordinated debt 86,129 77,459 86,101 79,271 OFF-BALANCE-SHEET FINANCIAL INSTRUMENTS Loan commitments 4,510 4,875 Letters of credit 671 637 Non-financial Assets and Non-financial Liabilities Measured at Fair Value The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. In addition, the Company has no non-financial liabilities measured at fair value on a nonrecurring basis. Non-financial assets measured at fair value on a nonrecurring basis include intangible assets. The intangible assets are evaluated at least annually for impairment. The overall levels of non-financial assets measured at fair value on a nonrecurring basis were no t considered to be significant to the Company at June 30, 2024 or December 31, 2023 .

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	(10) DERIVATIVE FINANCIAL INSTRUMENTS The Company enters into oil and gas swaps and options contracts to accommodate the business needs of its customers. Upon the origination of an oil or gas swap or option contract with a customer, to mitigate the exposure to fluctuations in oil and gas prices, the Company simultaneously enters into an offsetting contract with a counterparty. These derivatives are not designated as hedged instruments and are recorded on the Company's consolidated balance sheet at fair value and are included in other assets. The Company's derivative financial instruments require a daily margin to be posted, which fluctuates with oil and gas prices. At June 30, 2024 , the Company had a margin asset included in other assets in the amount of $ 7.2 million. At December 31, 2023 , the Company had a margin liability in other liabilities in the amount of $ 15.5 million. The Company utilizes dealer quotations and observable market data inputs to substantiate internal valuation models. The notional amounts and estimated fair values of oil and gas derivative positions outstanding are presented in the following table: June 30, 2024 December 31, 2023 Oil and Natural Gas Swaps and Options Notional Units Notional Estimated Notional Estimated (Notional amounts and dollars in thousands) Oil Derivative assets Barrels 3,866 $ 4,033 3,896 $ 20,567 Derivative liabilities Barrels ( 3,866 ) ( 3,097 ) ( 3,896 ) ( 19,512 ) Gas/Natural Gas Liquids Derivative assets MMBTUs/Gallons 39,502 11,206 46,140 20,532 Derivative liabilities MMBTUs/Gallons ( 39,502 ) ( 10,323 ) ( 46,140 ) ( 19,664 ) Total Fair Value Included in Derivative assets Other assets 15,239 41,099 Derivative liabilities Other liabilities ( 13,420 ) ( 39,176 ) The following table is a summary of the Company's recognized income related to the activity, which was included in other noninterest income: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 (Dollars in thousands) (Dollars in thousands) Derivative income $ 94 $ 260 $ 197 $ 349 The Company's credit exposure on oil and gas swaps and options varies based on the current market prices of oil and natural gas. Other than credit risk, changes in the fair value of customer positions will be offset by equal and opposite changes in the counterparty positions. The net positive fair value of the contracts represents the profit derived from the activity and is unaffected by the market price movements. The Company's share of total profit is approximately 35 %. Customer credit exposure is managed by strict position limits and is primarily offset by first liens on production while the remainder is offset by cash. Counterparty credit exposure is managed by selecting highly rated counterparties (rated A- or better by Standard and Poor's) and monitoring market information. The following table is a summary of the Company's net credit exposure relating to oil and gas swaps and options with bank counterparties: June 30, 2024 December 31, 2023 (Dollars in thousands) Credit exposure $ 7,134 $ 39,527 Balance Sheet Offsetting Derivatives may be eligible for offset in the consolidated balance sheet and/or subject to master netting arrangements. The Company's derivative transactions with upstream financial institution counterparties and bank customers are generally executed under International Swaps and Derivative Association ("ISDA") master agreements, which include "right of set-off" provisions. In such cases there is generally a legally enforceable right to offset recognized amounts and there may be an intention to settle such amounts on a net basis. Nonetheless, the Company does not generally offset such financial instruments for financial reporting purposes.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Segment Information	(11) SEGMENT INFORMATION The Company evaluates its performance with an internal profitability measurement system that measures the profitability of its business units on a pre-tax basis. The six principal business units are BancFirst metropolitan banks, BancFirst community banks, Pegasus, Worthington, other financial services and executive, operations and support. BancFirst metropolitan banks, BancFirst community banks, Pegasus and Worthington offer traditional banking products such as commercial and retail lending and a full line of deposit accounts. BancFirst metropolitan banks consist of banking locations in the metropolitan Oklahoma City and Tulsa areas. BancFirst community banks consist of banking locations in communities in Oklahoma outside the Oklahoma City and Tulsa metropolitan areas. Pegasus consists of banking locations in the Dallas metropolitan area. Worthington consists of banking locations in the Arlington, Fort Worth and Denton Texas. Other financial services are specialty product business units including guaranteed small business lending, residential mortgage lending, trust services, securities brokerage, electronic banking and insurance. The executive, operations and support groups represent executive management, operational support and corporate functions that are not allocated to the other business units. The results of operations and selected financial information for the six business units are as follows: BancFirst Metropolitan BancFirst Community Pegasus Worthington Other Executive, Eliminations Consolidated (Dollars in thousands) Three Months Ended June 30, 2024 Net interest income $ 29,139 $ 61,710 $ 11,363 $ 4,462 $ 1,103 $ 2,119 $ — $ 109,896 Noninterest income 5,562 16,886 339 250 13,513 58,064 ( 50,670 ) 43,944 Income before taxes 21,209 42,267 6,112 744 4,139 41,225 ( 50,530 ) 65,166 Three Months Ended June 30, 2023 Net interest income $ 29,269 $ 57,617 $ 13,509 $ 4,123 $ 1,058 $ 350 $ — $ 105,926 Noninterest income 7,090 19,986 467 255 12,350 63,688 ( 55,862 ) 47,974 Income before taxes 21,588 43,184 9,857 791 4,298 45,925 ( 55,677 ) 69,966 Six Months Ended June 30, 2024 Net interest income $ 57,332 $ 121,721 $ 22,230 $ 8,851 $ 2,122 $ 3,744 $ — $ 216,000 Noninterest income 10,731 32,804 659 471 28,676 116,492 ( 100,989 ) 88,844 Income before taxes 43,540 81,059 9,257 1,413 10,474 84,296 ( 100,663 ) 129,376 Six Months Ended June 30, 2023 Net interest income $ 60,008 $ 115,302 $ 28,660 $ 8,747 $ 2,000 $ 365 $ — $ 215,082 Noninterest income 13,177 39,518 681 534 26,522 129,831 ( 114,461 ) 95,802 Income before taxes 44,898 86,783 19,501 2,421 10,462 94,342 ( 114,096 ) 144,311 Total Assets: June 30, 2024 $ 3,365,250 $ 7,489,606 $ 1,360,612 $ 622,902 $ 121,308 $ 1,392,169 $ ( 1,614,529 ) $ 12,737,318 December 31, 2023 3,598,888 7,012,905 1,280,618 600,364 121,601 1,307,714 ( 1,550,048 ) 12,372,042 The financial information for each business unit is presented on the basis used internally by management to evaluate performance and allocate resources. The Company utilizes a transfer pricing system to allocate the benefit or cost of funds provided or used by the various business units. Certain services provided by the support group to other business units, such as item processing, are allocated at rates approximating the cost of providing the services. Eliminations are adjustments to consolidate the business units and companies.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements include the accounts of BancFirst Corporation, Council Oak Partners, LLC, BancFirst Insurance Services, Inc., Pegasus Bank ("Pegasus"), Worthington Bank ("Worthington") and BancFirst and its subsidiaries ("BancFirst"). The principal operating subsidiaries of BancFirst are BFTower, LLC, BFC-PNC LLC, and BancFirst Agency, Inc. All significant intercompany accounts and transactions have been eliminated. Assets held in a fiduciary or agency capacity are not assets of the Company and, accordingly, are not included in the unaudited interim consolidated financial statements. The accompanying unaudited interim consolidated financial statements and notes are presented in accordance with U.S. GAAP for interim financial information and the instructions for Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). The information contained in the consolidated financial statements and footnotes included in BancFirst Corporation’s Annual Report on Form 10-K for the year ended December 31, 2023, should be referred to in connection with these unaudited interim consolidated financial statements. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. The unaudited interim consolidated financial statements contained herein reflect all adjustments, which are, in the opinion of management, necessary to provide a fair statement of the financial position and results of operations of the Company for the interim periods presented. All such adjustments are of a normal and recurring nature.
Reclassifications	Reclassifications Certain items in prior consolidated financial statements have been reclassified to conform to the current presentation. Such reclassifications had no effect on previously reported cash flows, stockholders’ equity or comprehensive income.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States inherently involves the use of estimates and assumptions that affect the amounts reported in the financial statements and the related disclosures. These estimates relate principally to the determination of the allowance for credit losses, income taxes, the fair value of financial instruments and the valuation of assets and liabilities acquired in a business combination, including identifiable intangible assets. Such estimates and assumptions may change over time and actual amounts realized may differ from those reported.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Standards Not Yet Adopted: In December 2023, the Financial Accounting Standards Board (“FASB“) issued Accounting Standards Update (“ASU”) No. 2023-09, “Income Taxes - Improvements to Income Tax Disclosures” requiring enhancements and further transparency to certain income tax disclosures, most notably the tax rate reconciliation and income taxes paid. This ASU is effective for fiscal years beginning after December 15, 2024 on a prospective basis and retrospective application is permitted. The Company does not expect adoption of the standard to have a material impact on its consolidated financial statements. In November 2023, the FASB issued ASU 2023-07, “Segment Reporting - Improvements to Reportable Segment Disclosures” requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more decision-useful financial analyses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024 on a retrospective basis. The amendments are to be applied retrospectively to all periods presented and segment expense categories are required to be based on the categories identified at adoption. The Company is currently evaluating the provisions of this ASU and expects to adopt them for the year ending December 31, 2024. The Company does no t expect the adoption to have a significant impact on the Company’s consolidated financial statements.

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment	The following table summarizes the amortized cost and estimated fair values of debt securities held for investment: Amortized Gross Gross Estimated June 30, 2024 (Dollars in thousands) Mortgage backed securities (1) $ 3 $ — $ — $ 3 States and political subdivisions 335 — — 335 Other securities 500 — — 500 Total $ 838 $ — $ — $ 838 December 31, 2023 Mortgage backed securities (1) $ 5 $ — $ — $ 5 States and political subdivisions 685 — — 685 Other securities 500 — — 500 Total $ 1,190 $ — $ — $ 1,190
Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale	The following table summarizes the amortized cost and estimated fair values of debt securities available for sale: Amortized Gross Gross Estimated June 30, 2024 (Dollars in thousands) U.S. treasuries $ 1,450,915 $ — $ ( 60,133 ) $ 1,390,782 U.S. federal agencies 9,565 121 ( 3 ) 9,683 Mortgage backed securities (1) 15,647 7 ( 1,746 ) 13,908 States and political subdivisions 10,078 8 ( 135 ) 9,951 Asset backed securities 9,338 43 — 9,381 Other securities 8,163 — ( 1,341 ) 6,822 Total $ 1,503,706 $ 179 $ ( 63,358 ) $ 1,440,527 December 31, 2023 U.S. treasuries $ 1,560,265 $ 415 $ ( 62,635 ) $ 1,498,045 U.S. federal agencies 11,631 142 ( 3 ) 11,770 Mortgage backed securities (1) 16,459 13 ( 1,677 ) 14,795 States and political subdivisions 10,108 16 ( 114 ) 10,010 Asset backed securities 12,794 — ( 282 ) 12,512 Other securities 8,163 — ( 1,390 ) 6,773 Total $ 1,619,420 $ 586 $ ( 66,101 ) $ 1,553,905 (1) Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.
Maturity of Debt Securities	The maturities of debt securities held for investment and available for sale are summarized in the following table using contractual maturities. Actual maturities may differ from contractual maturities due to obligations that are called or prepaid. For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been presented at their contractual maturity. June 30, 2024 December 31, 2023 Amortized Estimated Amortized Estimated (Dollars in thousands) Held for Investment Contractual maturity of debt securities: Within one year $ 275 $ 275 $ 350 $ 350 After one year but within five years 563 563 840 840 After five years but within ten years — — — — After ten years — — — — Total $ 838 $ 838 $ 1,190 $ 1,190 Available for Sale Contractual maturity of debt securities: Within one year $ 364,890 $ 358,962 $ 348,318 $ 341,645 After one year but within five years 1,097,339 1,043,120 1,223,529 1,167,973 After five years but within ten years 11,071 9,657 10,331 8,851 After ten years 30,406 28,788 37,242 35,436 Total debt securities $ 1,503,706 $ 1,440,527 $ 1,619,420 $ 1,553,905
Company's Book Value of Pledged Debt Securities	The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law: June 30, 2024 December 31, 2023 (Dollars in thousands) Book value of pledged securities $ 910,357 $ 591,324
Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss	The following table summarizes debt securities with unrealized losses, segregated by the duration of the unrealized loss, at June 30, 2024 and December 31, 2023 respectively: Less than 12 Months More than 12 Months Total Number of investments Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) June 30, 2024 Available for Sale U.S. treasuries 62 $ 90,084 $ 926 $ 1,300,697 $ 59,207 $ 1,390,781 $ 60,133 U.S. federal agencies 2 205 2 688 1 893 3 Mortgage backed securities 69 1,188 9 12,455 1,737 13,643 1,746 States and political subdivisions 8 867 3 1,871 132 2,738 135 Other securities 3 — — 6,822 1,341 6,822 1,341 Total 144 $ 92,344 $ 940 $ 1,322,533 $ 62,418 $ 1,414,877 $ 63,358 December 31, 2023 Available for Sale U.S. treasuries 68 $ 4,838 $ 90 $ 1,401,669 $ 62,545 $ 1,406,507 $ 62,635 U.S. federal agencies 3 1,100 3 — — 1,100 3 Mortgage backed securities 74 80 — 13,261 1,677 13,341 1,677 States and political subdivisions 6 306 4 1,847 110 2,153 114 Asset backed securities 1 — — 12,512 282 12,512 282 Other securities 3 — — 6,773 1,390 6,773 1,390 Total 155 $ 6,324 $ 97 $ 1,436,062 $ 66,004 $ 1,442,386 $ 66,101

Loans Held for Investment and_2

Loans Held for Investment and Allowance for Credit Losses on Loans (Tables)	6 Months Ended
	Jun. 30, 2024
Receivables [Abstract]
Summary of Loans Held for Investment by Portfolio Segment	Loans held for investment are summarized by portfolio segment as follows: June 30, 2024 December 31, 2023 (Dollars in thousands) Real estate: Commercial real estate owner occupied 954,942 960,944 Commercial real estate non-owner occupied 1,604,132 1,486,420 Construction and development < 60 months 680,807 642,643 Construction residential real estate < 60 months 288,900 283,486 Residential real estate first lien 1,335,124 1,258,744 Residential real estate all other 260,036 244,696 Agriculture 432,360 427,139 Commercial non-real estate 1,436,349 1,289,452 Consumer non-real estate 469,084 476,467 Oil and gas 585,714 586,654 Total (1) $ 8,047,448 $ 7,656,645 (1) Excludes accrued interest receivable of $ 42.8 million at June 30, 2024 and $ 39.4 million at December 31, 2023, that is recorded in accrued interest receivable and other assets.
Summary of Other Real Estate Owned and Repossessed Assets	The following is a summary of other real estate owned and repossessed assets: June 30, 2024 December 31, 2023 (Dollars in thousands) Other real estate owned and repossessed assets $ 38,497 $ 34,200
Summary of Rental Income and Operating Expenses	This property had the following rental income and operating expenses for the periods presented. Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands) Rental income $ 3,085 $ 2,778 $ 6,026 $ 5,468 Operating expense 2,673 2,967 4,923 5,348
Summary of Amounts Included in Nonaccrual Loans Segregated by Portfolio Segment	The following table is a summary of amounts included in nonaccrual loans, segregated by portfolio segment. June 30, 2024 December 31, 2023 (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 5,543 $ 1,686 Commercial real estate non-owner occupied 3,280 874 Construction and development < 60 months 20,142 800 Construction residential real estate < 60 months 745 638 Residential real estate first lien 3,425 3,336 Residential real estate all other 628 899 Agriculture 2,092 3,662 Commercial non-real estate 5,605 10,101 Consumer non-real estate 685 449 Oil and gas 1,876 2,128 Total $ 44,021 $ 24,573
Age Analysis of Loans Held for Investments	Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. The following table presents an age analysis of the Company's loans held for investment: Age Analysis of Past Due Loans 30-59 60-89 90 Days Total Current Total Loans Accruing (Dollars in thousands) As of June 30, 2024 Real estate: Commercial real estate owner occupied $ 3,020 $ 38 $ 5,379 $ 8,437 $ 946,505 $ 954,942 $ 532 Commercial real estate non-owner occupied — 141 1,544 1,685 1,602,447 1,604,132 803 Construction and development < 60 months 405 1,738 831 2,974 677,833 680,807 31 Construction residential real estate < 60 months 229 117 407 753 288,147 288,900 — Residential real estate first lien 4,929 2,144 2,213 9,286 1,325,838 1,335,124 961 Residential real estate all other 866 152 835 1,853 258,183 260,036 250 Agriculture 1,805 937 1,447 4,189 428,171 432,360 916 Commercial non-real estate 1,857 831 5,256 7,944 1,428,405 1,436,349 587 Consumer non-real estate 3,166 555 495 4,216 464,868 469,084 200 Oil and gas 588 416 — 1,004 584,710 585,714 — Total $ 16,865 $ 7,069 $ 18,407 $ 42,341 $ 8,005,107 $ 8,047,448 $ 4,280 As of December 31, 2023 Real estate: Commercial real estate owner occupied $ 1,386 $ 26 $ 5,598 $ 7,010 $ 953,934 $ 960,944 $ 4,377 Commercial real estate non-owner occupied 2,224 7,371 1,786 11,381 1,475,039 1,486,420 913 Construction and development < 60 months 198 158 800 1,156 641,487 642,643 — Construction residential real estate < 60 months 1,542 206 405 2,153 281,333 283,486 332 Residential real estate first lien 3,879 1,204 1,849 6,932 1,251,812 1,258,744 731 Residential real estate all other 757 190 613 1,560 243,136 244,696 549 Agriculture 1,694 724 1,227 3,645 423,494 427,139 579 Commercial non-real estate 1,501 436 10,028 11,965 1,277,487 1,289,452 1,714 Consumer non-real estate 3,248 1,090 594 4,932 471,535 476,467 347 Oil and gas — — 92 92 586,562 586,654 — Total $ 16,429 $ 11,405 $ 22,992 $ 50,826 $ 7,605,819 $ 7,656,645 $ 9,542
Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades	The following table summarizes the Company’s gross loans held for investment by year of origination and internally assigned credit grades: Term Loans Amortized Cost Basis by Origination Year Revolving Loans (Dollars in thousands) 2024 2023 2022 2021 2020 Prior Amortized Cost Basis Total As of June 30, 2024 Commercial real estate owner occupied Grade 1 $ 39,257 $ 104,695 $ 151,859 $ 111,308 $ 78,999 $ 186,219 $ 25,667 $ 698,004 Grade 2 23,094 34,818 49,139 44,044 21,710 34,604 24,187 231,596 Grade 3 128 7,339 3,574 4,489 939 4,121 2,100 22,690 Grade 4 — 372 21 170 352 1,615 122 2,652 Total commercial real estate owner occupied 62,479 147,224 204,593 160,011 102,000 226,559 52,076 954,942 Commercial real estate non-owner occupied Grade 1 $ 64,168 $ 258,439 $ 283,026 $ 187,391 $ 120,052 $ 126,177 $ 41,093 $ 1,080,346 Grade 2 61,660 104,871 126,693 89,290 38,105 71,591 3,122 495,332 Grade 3 8,934 141 13,635 1,690 — 245 — 24,645 Grade 4 185 2,043 643 316 98 524 — 3,809 Total commercial real estate non-owner occupied 134,947 365,494 423,997 278,687 158,255 198,537 44,215 1,604,132 Construction and development < 60 months Grade 1 $ 49,830 $ 76,166 $ 146,196 $ 33,350 $ 9,848 $ 7,591 $ 51,139 $ 374,120 Grade 2 64,768 118,553 62,487 8,296 1,590 14,969 10,703 281,366 Grade 3 2,641 1,829 — 354 71 68 19,287 24,250 Grade 4 — — 831 100 140 — — 1,071 Total construction and development < 60 months 117,239 196,548 209,514 42,100 11,649 22,628 81,129 680,807 Construction residential real estate < 60 months Grade 1 $ 78,419 $ 48,981 $ 15,922 $ 8,162 $ 98 $ 546 $ 30,001 $ 182,129 Grade 2 54,233 33,153 2,447 15 12 — 11,630 101,490 Grade 3 3,503 408 — — — — 396 4,307 Grade 4 568 200 206 — — — — 974 Total construction residential real estate < 60 months 136,723 82,742 18,575 8,177 110 546 42,027 288,900 Residential real estate first lien Grade 1 $ 134,305 $ 211,033 $ 205,048 $ 162,128 $ 130,865 $ 192,862 $ 5,031 $ 1,041,272 Grade 2 43,810 65,488 50,368 37,025 25,620 48,645 519 271,475 Grade 3 1,453 2,576 3,098 2,835 1,821 5,562 — 17,345 Grade 4 907 646 312 795 539 1,756 — 4,955 Grade 5 — 77 — — — — — 77 Total residential real estate first lien 180,475 279,820 258,826 202,783 158,845 248,825 5,550 1,335,124 Residential real estate all other Grade 1 $ 18,801 $ 34,325 $ 21,028 $ 6,512 $ 7,196 $ 12,957 $ 54,939 $ 155,758 Grade 2 3,804 5,198 4,467 1,341 1,462 3,918 79,266 99,456 Grade 3 756 344 106 176 295 437 1,507 3,621 Grade 4 — 174 67 — — 26 934 1,201 Total residential real estate all other 23,361 40,041 25,668 8,029 8,953 17,338 136,646 260,036 Agriculture Grade 1 $ 26,725 $ 36,340 $ 44,928 $ 31,695 $ 22,757 $ 46,282 $ 46,588 $ 255,315 Grade 2 23,833 21,355 20,788 16,052 9,606 19,830 39,081 150,545 Grade 3 5,833 8,951 1,119 1,076 2,589 3,072 1,686 24,326 Grade 4 354 886 612 51 5 262 4 2,174 Total Agriculture 56,745 67,532 67,447 48,874 34,957 69,446 87,359 432,360 Commercial non-real estate Grade 1 $ 98,481 $ 135,724 $ 155,712 $ 132,447 $ 28,731 $ 58,159 $ 421,728 $ 1,030,982 Grade 2 57,646 94,429 30,313 20,608 5,593 6,885 176,353 391,827 Grade 3 1,471 2,160 2,183 1,035 235 250 2,637 9,971 Grade 4 787 364 793 255 508 116 563 3,386 Grade 5 — — — 6 — 177 — 183 Total commercial non-real estate 158,385 232,677 189,001 154,351 35,067 65,587 601,281 1,436,349 Consumer non-real estate Grade 1 $ 105,282 $ 153,775 $ 77,329 $ 40,937 $ 11,724 $ 6,655 $ 12,793 $ 408,495 Grade 2 9,876 17,288 10,906 5,582 1,542 1,219 6,427 52,840 Grade 3 1,059 1,839 1,641 1,119 274 276 15 6,223 Grade 4 198 556 314 282 104 68 4 1,526 Total consumer non-real estate 116,415 173,458 90,190 47,920 13,644 8,218 19,239 469,084 Oil and gas Grade 1 $ 76,512 $ 63,488 $ 5,807 $ 26,153 $ 5,951 $ 3,116 $ 269,441 $ 450,468 Grade 2 60,737 9,097 5,045 677 374 267 58,161 134,358 Grade 3 29 109 — 183 — — — 321 Grade 4 — — — 127 — 440 — 567 Total oil and gas 137,278 72,694 10,852 27,140 6,325 3,823 327,602 585,714 Total loans held for investment $ 1,124,047 $ 1,658,230 $ 1,498,663 $ 978,072 $ 529,805 $ 861,507 $ 1,397,124 $ 8,047,448
Gross Charge-offs by Year of Origination	The following tables summarize the Company's gross charge-offs by year of origination for the periods indicated: Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2024 2023 2022 2021 2020 Prior Amortized Cost Basis Total (Dollars in thousands) Three months ended June 30, 2024 Commercial real estate owner occupied Current-period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate non-owner occupied Current-period gross charge-offs — — — 1 — — — 1 Construction and development < 60 months Current-period gross charge-offs — — — — — — — — Construction residential real estate < 60 months Current-period gross charge-offs — — — — — — — — Residential real estate first lien Current-period gross charge-offs 2 23 — 2 4 36 — 67 Residential real estate all other Current-period gross charge-offs — — — — — — — — Agriculture Current-period gross charge-offs — — 6 13 — — — 19 Commercial non-real estate Current-period gross charge-offs 6 155 43 8 — 190 378 780 Consumer non-real estate Current-period gross charge-offs 21 256 150 28 21 30 4 510 Oil and gas Current-period gross charge-offs — — — — — — — — Total current-period gross charge-offs $ 29 $ 434 $ 199 $ 52 $ 25 $ 256 $ 382 $ 1,377 Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2023 2022 2021 2020 2019 Prior Amortized Cost Basis Total (Dollars in thousands) Three months ended June 30, 2023 Commercial real estate owner occupied Current-period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate non-owner occupied Current-period gross charge-offs — — — — — — — — Construction and development < 60 months Current-period gross charge-offs — — — 2 — — — 2 Construction residential real estate < 60 months Current-period gross charge-offs — — — — — — — — Residential real estate first lien Current-period gross charge-offs — — 19 21 — 2 — 42 Residential real estate all other Current-period gross charge-offs — 2 — — — — — 2 Agriculture Current-period gross charge-offs — — — 301 1 — — 302 Commercial non-real estate Current-period gross charge-offs 42 34 1 20 — 5 — 102 Consumer non-real estate Current-period gross charge-offs 29 186 115 14 28 11 15 398 Oil and gas Current-period gross charge-offs — 2 — — — — — 2 Total current-period gross charge-offs $ 71 $ 224 $ 135 $ 358 $ 29 $ 18 $ 15 $ 850 Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2024 2023 2022 2021 2020 Prior Amortized Cost Basis Total (Dollars in thousands) Six months ended June 30, 2024 Commercial real estate owner occupied Current-period gross charge-offs $ — $ — $ — $ 15 $ — $ — $ — $ 15 Commercial real estate non-owner occupied Current-period gross charge-offs — 12 — 1 1 — — 14 Construction and development < 60 months Current-period gross charge-offs — — — — — — — — Construction residential real estate < 60 months Current-period gross charge-offs — 3 — — — — — 3 Residential real estate first lien Current-period gross charge-offs 3 23 — 3 4 57 — 90 Residential real estate all other Current-period gross charge-offs — — — — — 2 27 29 Agriculture Current-period gross charge-offs — — 37 13 — — — 50 Commercial non-real estate Current-period gross charge-offs 6 1,156 318 140 12 316 1,886 3,834 Consumer non-real estate Current-period gross charge-offs 21 500 247 79 34 45 15 941 Oil and gas Current-period gross charge-offs — 9 83 — — — — 92 Total current-period gross charge-offs $ 30 $ 1,703 $ 685 $ 251 $ 51 $ 420 $ 1,928 $ 5,068 Term Loans Amortized Cost Basis by Origination Year Revolving Loans 2023 2022 2021 2020 2019 Prior Amortized Cost Basis Total (Dollars in thousands) Six months ended June 30, 2023 Commercial real estate owner occupied Current-period gross charge-offs $ — $ 7 $ 1 $ 22 $ 18 $ — $ — $ 48 Commercial real estate non-owner occupied Current-period gross charge-offs — — — — — 3 — 3 Construction and development < 60 months Current-period gross charge-offs — 2 — 2 — — — 4 Construction residential real estate < 60 months Current-period gross charge-offs — — — — — — — — Residential real estate first lien Current-period gross charge-offs — — 19 21 — 4 — 44 Residential real estate all other Current-period gross charge-offs — 4 19 — 1 4 — 28 Agriculture Current-period gross charge-offs — 4 — 317 14 2 — 337 Commercial non-real estate Current-period gross charge-offs 42 101 63 20 — 52 — 278 Consumer non-real estate Current-period gross charge-offs 29 262 147 29 37 17 17 538 Oil and gas Current-period gross charge-offs — 2 — — — — — 2 Total current-period gross charge-offs $ 71 $ 382 $ 249 $ 411 $ 70 $ 82 $ 17 $ 1,282
Activity in Allowance for Credit Losses on Loans	The following tables detail activity in the allowance for credit losses on loans for the period presented. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Three Months Ended June 30, 2024 Real estate: Commercial real estate owner occupied $ 7,468 $ — $ 11 $ 11 $ ( 109 ) $ 7,370 Commercial real estate non-owner occupied 33,180 ( 1 ) — ( 1 ) 688 33,867 Construction and development < 60 months 6,596 — — — 184 6,780 Construction residential real estate < 60 months 3,464 — — — 55 3,519 Residential real estate first lien 4,923 ( 67 ) 21 ( 46 ) 695 5,572 Residential real estate all other 1,652 — 3 3 74 1,729 Agriculture 6,137 ( 19 ) 5 ( 14 ) ( 206 ) 5,917 Commercial non-real estate 20,482 ( 780 ) 280 ( 500 ) 1,493 21,475 Consumer non-real estate 4,335 ( 510 ) 58 ( 452 ) 500 4,383 Oil and gas 9,030 — — — ( 16 ) 9,014 Total $ 97,267 $ ( 1,377 ) $ 378 $ ( 999 ) $ 3,358 $ 99,626 Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Three Months Ended June 30, 2023 Real estate: Commercial real estate owner occupied $ 6,547 $ — $ 3 $ 3 $ 258 $ 6,808 Commercial real estate non-owner occupied 32,120 — — — 1,312 33,432 Construction and development < 60 months 3,608 ( 2 ) 3 1 ( 169 ) 3,440 Construction residential real estate < 60 months 3,226 — — — 327 3,553 Residential real estate first lien 4,454 ( 42 ) 10 ( 32 ) 333 4,755 Residential real estate all other 1,444 ( 2 ) 1 ( 1 ) 218 1,661 Agriculture 6,268 ( 302 ) 7 ( 295 ) 453 6,426 Commercial non-real estate 25,079 ( 102 ) 127 25 23 25,127 Consumer non-real estate 4,232 ( 398 ) 35 ( 363 ) 475 4,344 Oil and gas 7,782 ( 2 ) — ( 2 ) ( 406 ) 7,374 Total $ 94,760 $ ( 850 ) $ 186 $ ( 664 ) $ 2,824 $ 96,920 Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Six Months Ended June 30, 2024 Real estate: Commercial real estate owner occupied $ 7,483 $ ( 15 ) $ 31 $ 16 $ ( 129 ) $ 7,370 Commercial real estate non-owner occupied 33,080 ( 14 ) — ( 14 ) 801 33,867 Construction and development < 60 months 3,950 — — — 2,830 6,780 Construction residential real estate < 60 months 3,414 ( 3 ) — ( 3 ) 108 3,519 Residential real estate first lien 4,914 ( 90 ) 25 ( 65 ) 723 5,572 Residential real estate all other 1,646 ( 29 ) 8 ( 21 ) 104 1,729 Agriculture 6,137 ( 50 ) 17 ( 33 ) ( 187 ) 5,917 Commercial non-real estate 22,745 ( 3,834 ) 313 ( 3,521 ) 2,251 21,475 Consumer non-real estate 4,401 ( 941 ) 127 ( 814 ) 796 4,383 Oil and gas 9,030 ( 92 ) — ( 92 ) 76 9,014 Total $ 96,800 $ ( 5,068 ) $ 521 $ ( 4,547 ) $ 7,373 $ 99,626 Allowance for Credit Losses Balance at Charge- Recoveries Net Provision for/(benefit from) credit losses on loans Balance at (Dollars in thousands) Six Months Ended June 30, 2023 Real estate: Commercial real estate owner occupied $ 6,416 $ ( 48 ) $ 52 $ 4 $ 388 $ 6,808 Commercial real estate non-owner occupied 30,190 ( 3 ) — ( 3 ) 3,245 33,432 Construction and development < 60 months 3,778 ( 4 ) 6 2 ( 340 ) 3,440 Construction residential real estate < 60 months 3,275 — — — 278 3,553 Residential real estate first lien 4,092 ( 44 ) 13 ( 31 ) 694 4,755 Residential real estate all other 1,418 ( 28 ) 3 ( 25 ) 268 1,661 Agriculture 6,217 ( 337 ) 13 ( 324 ) 533 6,426 Commercial non-real estate 25,106 ( 278 ) 149 ( 129 ) 150 25,127 Consumer non-real estate 4,132 ( 538 ) 92 ( 446 ) 658 4,344 Oil and gas 8,104 ( 2 ) — ( 2 ) ( 728 ) 7,374 Total $ 92,728 $ ( 1,282 ) $ 328 $ ( 954 ) $ 5,146 $ 96,920
Collateral-Dependent Gross Loans Held for Investment by Collateral Type and Related Specific Allocation	The following tables summarize collateral-dependent gross loans held for investment by collateral type and the related specific allocation as follows: Collateral Type Real Estate Business Assets Other Assets Total Specific Allocation (Dollars in thousands) As of June 30, 2024 Real estate: Commercial real estate owner occupied $ — $ — $ — $ — $ — Commercial real estate non-owner occupied 643 — — 643 250 Construction and development < 60 months 20,142 — — 20,142 2,825 Construction residential real estate < 60 months 618 — — 618 134 Residential real estate first lien 195 — — 195 66 Residential real estate all other 79 — — 79 81 Agriculture 1,833 401 14 2,248 1,193 Commercial non-real estate — 4,140 87 4,227 1,342 Consumer non-real estate — — 236 236 133 Oil and gas — — — — — Total collateral-dependent loans held for investment $ 23,510 $ 4,541 $ 337 $ 28,388 $ 6,024 Collateral Type Real Estate Business Assets Other Assets Total Specific Allocation (Dollars in thousands) As of December 31, 2023 Real estate: Commercial real estate owner occupied $ — $ — $ — $ — $ — Commercial real estate non-owner occupied 632 — — 632 250 Construction and development < 60 months 800 — — 800 225 Construction residential real estate < 60 months 638 — — 638 134 Residential real estate first lien 189 — — 189 62 Residential real estate all other 140 — — 140 140 Agriculture 1,841 593 15 2,449 1,386 Commercial non-real estate — 6,090 241 6,331 1,867 Consumer non-real estate — — 147 147 88 Oil and gas — — — — — Total collateral-dependent loans held for investment $ 4,240 $ 6,683 $ 403 $ 11,326 $ 4,152
Transfers from Loans and Premises and Equipment to Other Real Estate Owned and Repossessed Assets	Transfers from loans and premises and equipment to other real estate owned and repossessed assets during the periods presented are summarized as follows: Six Months Ended June 30, 2024 2023 (Dollars in thousands) Other real estate owned $ 8,995 $ 667 Repossessed assets 1,575 946 Total $ 10,570 $ 1,613

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	6 Months Ended
	Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following is a summary of intangible assets as of the date listed: Gross Accumulated Net (Dollars in thousands) June 30, 2024 Core deposit intangibles $ 33,550 $ ( 18,741 ) $ 14,809 Customer relationship intangibles 3,350 ( 3,228 ) 122 Total $ 36,900 $ ( 21,969 ) $ 14,931 December 31, 2023 Core deposit intangibles $ 33,550 $ ( 17,027 ) $ 16,523 Customer relationship intangibles 3,350 ( 3,169 ) 181 Total $ 36,900 $ ( 20,196 ) $ 16,704
Summary of Goodwill by Business Segment	The following is a summary of goodwill by business segment: BancFirst Metropolitan Banks BancFirst Community Banks Pegasus Worthington Other Financial Services Executive, Operations & Support Consolidated (Dollars in thousands) Six months ended June 30, 2024 Balance at beginning and end of period $ 13,767 $ 61,420 $ 68,855 $ 32,133 $ 5,464 $ 624 $ 182,263

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Summary of Activity Under RSU Plan	The following table is a summary of the activity under the Company's RSU plan. Wgtd. Avg. Restricted Grant Date Stock Units Fair Value Six Months Ended June 30, 2024 Nonvested at December 31, 2023 32,075 $ 87.23 Granted 7,250 88.57 Forfeited ( 1,500 ) 83.61 Nonvested at June 30, 2024 37,825 87.63
Summary of Accumulated Stock Units	A summary of the accumulated stock units under the Deferred Stock Compensation Plan is as follows: June 30, 2024 December 31, 2023 Accumulated stock units 119,115 119,575 Average price $ 42.43 $ 40.03
Summary of Activity Under Stock Option Plan	The following table is a summary of the activity under both the Employee Plan and the Non-Employee Directors’ Plan: Wgtd. Avg. Wgtd. Avg. Remaining Aggregate Exercise Contractual Intrinsic Options Price Term Value (Dollars in thousands, except option data) Six Months Ended June 30, 2024 Outstanding at December 31, 2023 1,241,391 $ 53.12 Options exercised ( 84,084 ) 28.80 Options canceled, forfeited, or expired ( 12,000 ) 91.64 Outstanding at June 30, 2024 1,145,307 54.50 9.57 Yrs. $ 38,022 Exercisable at June 30, 2024 502,932 37.51 6.64 Yrs. $ 25,243
Options Exercised Under Stock Option Plan	The following table has additional information regarding options exercised under both the Employee Plan and the Non-Employee Directors’ Plan: Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands) Total intrinsic value of options exercised $ 3,254 $ 1,979 $ 5,085 $ 2,331 Cash received from options exercised 1,714 1,318 2,422 1,539 Tax benefit realized from options exercised 782 475 1,222 560
Stock-based Employee Compensation Expense	The components of stock-based compensation expense for all share-based compensation plans and related tax benefits are as follows: Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands) Stock-based compensation expense $ 920 $ 831 $ 1,635 $ 1,213 Tax benefit 221 200 393 292 Stock-based compensation expense, net of tax $ 699 $ 631 $ 1,242 $ 921 The Company will continue to amortize the unearned stock-based compensation expense over the remaining weighted average vesting period of approximately five years for unvested stock options and six years for unvested RSUs. The following table shows the unearned stock-based compensation expense for unvested stock options and unvested RSUs:
Unearned Stock-based Compensation Expense	June 30, 2024 (Dollars in thousands) Unearned stock-based compensation expense for unvested stock options $ 8,769 Unearned stock-based compensation expense for unvested RSU's 2,940

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2024
Equity [Abstract]
Summary of Shares Repurchased Under Stock Purchase Program	The following table is a summary of the shares under the SRP: June 30, 2024 Shares remaining to be repurchased 479,784
Required Capital Amounts and Company's Respective Ratios	The actual and required capital amounts and ratios are shown in the following table: Required To Be Well For Capital With Capitalized Under Adequacy Capital Conservation Prompt Corrective Actual Purposes Buffer Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) As of June 30, 2024: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,548,490 17.22 % $ 719,342 8.00 % $ 944,136 10.50 % N/A N/A BancFirst 1,224,212 16.09 % 608,791 8.00 % 799,039 10.50 % $ 760,989 10.00 % Pegasus 143,683 15.85 % 72,538 8.00 % 95,206 10.50 % 90,672 10.00 % Worthington 53,063 11.85 % 35,810 8.00 % 47,001 10.50 % 44,763 10.00 % Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,363,539 15.16 % $ 404,630 4.50 % $ 629,424 7.00 % N/A N/A BancFirst 1,119,672 14.71 % 342,445 4.50 % 532,693 7.00 % $ 494,643 6.50 % Pegasus 134,727 14.86 % 40,802 4.50 % 63,470 7.00 % 58,937 6.50 % Worthington 48,955 10.94 % 20,143 4.50 % 31,334 7.00 % 29,096 6.50 % Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,389,539 15.45 % $ 539,507 6.00 % $ 764,301 8.50 % N/A N/A BancFirst 1,139,672 14.98 % 456,594 6.00 % 646,841 8.50 % $ 608,791 8.00 % Pegasus 134,727 14.86 % 54,403 6.00 % 77,071 8.50 % 72,538 8.00 % Worthington 48,955 10.94 % 26,858 6.00 % 38,048 8.50 % 35,810 8.00 % Tier 1 Capital (to Quarterly Average Assets)- BancFirst Corporation $ 1,389,539 11.10 % $ 500,747 4.00 % N/A N/A N/A N/A BancFirst 1,139,672 10.69 % 426,413 4.00 % N/A N/A $ 533,017 5.00 % Pegasus 134,727 10.59 % 50,900 4.00 % N/A N/A 63,624 5.00 % Worthington 48,955 8.44 % 23,207 4.00 % N/A N/A 29,008 5.00 %

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2024
Earnings Per Share [Abstract]
Basic and Diluted Net Income Per Common Share	Basic and diluted net income per common share are calculated as follows: Three Months Ended Six Months Ended 2024 2023 2024 2023 (Dollars in thousands, except per share data) (Numerator) Income available to common stockholders $ 50,641 $ 55,010 $ 100,975 $ 112,543 (Denominator) Weighted average shares outstanding for basic earnings per common share 33,001,180 32,920,497 32,974,582 32,906,753 Dilutive effect of stock compensation 523,881 546,757 545,665 559,178 Weighted-average shares outstanding for diluted earnings per common share 33,525,061 33,467,254 33,520,247 33,465,931 Basic earnings per share $ 1.53 $ 1.67 $ 3.06 $ 3.42 Diluted earnings per share $ 1.51 $ 1.64 $ 3.01 $ 3.36
Average Exercise Price of Options Excluded from Computation of Diluted Net Income Per Common Share	The following table shows the number of options and RSU's that were excluded from the computation of diluted net income per common share for each period because they were anti-dilutive for the period: Shares Three Months Ended June 30, 2024 260,548 Three Months Ended June 30, 2023 305,407 Six Months Ended June 30, 2024 262,251 Six Months Ended June 30, 2023 307,608

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of the periods presented, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Fair Value (Dollars in thousands) June 30, 2024 Debt securities available for sale: U.S. Treasury $ 1,390,782 $ — $ — $ 1,390,782 U.S. federal agencies — 9,683 — 9,683 Mortgage-backed securities — 13,908 — 13,908 States and political subdivisions — 9,801 150 9,951 Asset backed securities — 9,381 — 9,381 Other debt securities — 6,822 — 6,822 Derivative assets — 15,239 — 15,239 Derivative liabilities — 13,420 — 13,420 December 31, 2023 Debt securities available for sale: U.S. Treasury $ 1,498,045 $ — $ — $ 1,498,045 U.S. federal agencies — 11,770 — 11,770 Mortgage-backed securities — 14,795 — 14,795 States and political subdivisions — 9,830 180 10,010 Asset backed securities — 12,512 — 12,512 Other debt securities 6,773 6,773 Derivative assets — 41,099 — 41,099 Derivative liabilities — 39,176 — 39,176
Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis	The changes in Level 3 assets measured at estimated fair value on a recurring basis during the periods presented were as follows: Six Months Ended June 30, Twelve Months Ended December 31, 2024 2023 (Dollars in thousands) Balance at the beginning of the year $ 180 $ 454 Transfers to level 2 — ( 244 ) Settlements ( 30 ) ( 30 ) Balance at the end of the period $ 150 $ 180
Assets Measured at Fair Value on Nonrecurring Basis	The following table summarizes assets measured at fair value on a nonrecurring basis during the period presented. These nonrecurring fair values do not represent all assets, only those assets that have been adjusted during the reporting period: Total Fair Value Level 3 (Dollars in thousands) As of and for the Year-to-date Period Ended June 30, 2024 Equity securities $ 13,331 Collateral dependent loans 230 Repossessed assets 657 Other real estate owned 6,838 As of and for the Year-to-date Period Ended December 31, 2023 Equity securities $ 13,144 Collateral dependent loans 1,894 Repossessed assets 474 Other real estate owned 31,773
Estimated Fair Values of Financial Instruments	The estimated fair values of the Company’s financial instruments that are reported at amortized cost in the Company’s consolidated balance sheets, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows: June 30, 2024 December 31, 2023 Carrying Fair Value Carrying Fair Value (Dollars in thousands) FINANCIAL ASSETS Level 2 inputs: Cash and cash equivalents $ 2,493,292 $ 2,493,292 $ 2,397,463 $ 2,397,463 Federal funds sold 1,102 1,102 $ 1,316 1,316 Debt securities held for investment 3 3 5 5 Loans held for sale 7,408 7,408 3,489 3,489 Level 3 inputs: Debt securities held for investment 835 835 1,185 1,185 Loans, net of allowance for credit losses 7,947,822 8,692,589 7,559,845 7,356,768 FINANCIAL LIABILITIES Level 2 inputs: Deposits 11,015,602 10,511,836 10,700,122 10,413,348 Short-term borrowings 4,264 4,264 3,351 3,351 Subordinated debt 86,129 77,459 86,101 79,271 OFF-BALANCE-SHEET FINANCIAL INSTRUMENTS Loan commitments 4,510 4,875 Letters of credit 671 637

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Notional Amounts and Estimated Fair Values of Oil and Gas Derivative Positions Outstanding	The Company utilizes dealer quotations and observable market data inputs to substantiate internal valuation models. The notional amounts and estimated fair values of oil and gas derivative positions outstanding are presented in the following table: June 30, 2024 December 31, 2023 Oil and Natural Gas Swaps and Options Notional Units Notional Estimated Notional Estimated (Notional amounts and dollars in thousands) Oil Derivative assets Barrels 3,866 $ 4,033 3,896 $ 20,567 Derivative liabilities Barrels ( 3,866 ) ( 3,097 ) ( 3,896 ) ( 19,512 ) Gas/Natural Gas Liquids Derivative assets MMBTUs/Gallons 39,502 11,206 46,140 20,532 Derivative liabilities MMBTUs/Gallons ( 39,502 ) ( 10,323 ) ( 46,140 ) ( 19,664 ) Total Fair Value Included in Derivative assets Other assets 15,239 41,099 Derivative liabilities Other liabilities ( 13,420 ) ( 39,176 )
Summary of Company's Recognized Income Related to Activity Included in Other Noninterest Income	The following table is a summary of the Company's recognized income related to the activity, which was included in other noninterest income: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 (Dollars in thousands) (Dollars in thousands) Derivative income $ 94 $ 260 $ 197 $ 349
Summary of Company's Net Credit Exposure Relating to Oil and Gas Swaps and Options with Bank Counterparties	The following table is a summary of the Company's net credit exposure relating to oil and gas swaps and options with bank counterparties: June 30, 2024 December 31, 2023 (Dollars in thousands) Credit exposure $ 7,134 $ 39,527

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Results of Operations and Selected Financial Information	The results of operations and selected financial information for the six business units are as follows: BancFirst Metropolitan BancFirst Community Pegasus Worthington Other Executive, Eliminations Consolidated (Dollars in thousands) Three Months Ended June 30, 2024 Net interest income $ 29,139 $ 61,710 $ 11,363 $ 4,462 $ 1,103 $ 2,119 $ — $ 109,896 Noninterest income 5,562 16,886 339 250 13,513 58,064 ( 50,670 ) 43,944 Income before taxes 21,209 42,267 6,112 744 4,139 41,225 ( 50,530 ) 65,166 Three Months Ended June 30, 2023 Net interest income $ 29,269 $ 57,617 $ 13,509 $ 4,123 $ 1,058 $ 350 $ — $ 105,926 Noninterest income 7,090 19,986 467 255 12,350 63,688 ( 55,862 ) 47,974 Income before taxes 21,588 43,184 9,857 791 4,298 45,925 ( 55,677 ) 69,966 Six Months Ended June 30, 2024 Net interest income $ 57,332 $ 121,721 $ 22,230 $ 8,851 $ 2,122 $ 3,744 $ — $ 216,000 Noninterest income 10,731 32,804 659 471 28,676 116,492 ( 100,989 ) 88,844 Income before taxes 43,540 81,059 9,257 1,413 10,474 84,296 ( 100,663 ) 129,376 Six Months Ended June 30, 2023 Net interest income $ 60,008 $ 115,302 $ 28,660 $ 8,747 $ 2,000 $ 365 $ — $ 215,082 Noninterest income 13,177 39,518 681 534 26,522 129,831 ( 114,461 ) 95,802 Income before taxes 44,898 86,783 19,501 2,421 10,462 94,342 ( 114,096 ) 144,311 Total Assets: June 30, 2024 $ 3,365,250 $ 7,489,606 $ 1,360,612 $ 622,902 $ 121,308 $ 1,392,169 $ ( 1,614,529 ) $ 12,737,318 December 31, 2023 3,598,888 7,012,905 1,280,618 600,364 121,601 1,307,714 ( 1,550,048 ) 12,372,042

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail)	Jun. 30, 2024
ASU 2023-07 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true

Recent Developments Including M

Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 17, 2021
Business Combination Separately Recognized Transactions [Line Items]
Total assets	$ 12,737,318	$ 12,372,042
Deposits	11,015,602	10,700,122
Goodwill	$ 182,263	$ 182,263
Subordinated Notes due 2036 [Member] | Private Placement [Member]
Business Combination Separately Recognized Transactions [Line Items]
Aggregate principal amount			$ 60,000
Fixed-to-floating rate			3.50%

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 838	$ 1,190
Estimated Fair Value	838	1,190
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	3	5
Estimated Fair Value	3	5
States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	335	685
Estimated Fair Value	335	685
Other Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	500	500
Estimated Fair Value	$ 500	$ 500

Securities - Summary of Amort_2

Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,503,706	$ 1,619,420
Gross Unrealized Gains	179	586
Gross Unrealized Losses	(63,358)	(66,101)
Estimated Fair Value	1,440,527	1,553,905
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,450,915	1,560,265
Gross Unrealized Gains		415
Gross Unrealized Losses	(60,133)	(62,635)
Estimated Fair Value	1,390,782	1,498,045
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,565	11,631
Gross Unrealized Gains	121	142
Gross Unrealized Losses	(3)	(3)
Estimated Fair Value	9,683	11,770
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,647	16,459
Gross Unrealized Gains	7	13
Gross Unrealized Losses	(1,746)	(1,677)
Estimated Fair Value	13,908	14,795
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,078	10,108
Gross Unrealized Gains	8	16
Gross Unrealized Losses	(135)	(114)
Estimated Fair Value	9,951	10,010
Asset backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,338	12,794
Gross Unrealized Gains	43
Gross Unrealized Losses		(282)
Estimated Fair Value	9,381	12,512
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,163	8,163
Gross Unrealized Losses	(1,341)	(1,390)
Estimated Fair Value	$ 6,822	$ 6,773

Securities - Additional Informa

Securities - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-Sale [Line Items]
Proceeds from sales of available for sale securities	$ 0	$ 0
Avaliable for sale of debt securities realized gains or losses	$ 0	$ 0

Securities - Maturity of Debt S

Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 275	$ 350
Amortized cost, After one year but within five years	563	840
Amortized Cost	838	1,190
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	364,890	348,318
Amortized Cost, After one year but within five years	1,097,339	1,223,529
Amortized Cost, After five years but within ten years	11,071	10,331
Amortized Cost, After ten years	30,406	37,242
Amortized Cost	1,503,706	1,619,420
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	275	350
Estimated Fair Value, After one year but within five years	563	840
Estimated Fair Value	838	1,190
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	358,962	341,645
Estimated Fair Value, After one year but within five years	1,043,120	1,167,973
Estimated Fair Value, After five years but within ten years	9,657	8,851
Estimated Fair Value, After ten years	28,788	35,436
Total debt securities	$ 1,440,527	$ 1,553,905

Securities - Company's Book Val

Securities - Company's Book Value of Pledged Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Asset Pledged as Collateral without Right [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Book value of pledged securities	$ 910,357	$ 591,324

Securities - Summary of Debt Se

Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands	Jun. 30, 2024 USD ($) Investments	Dec. 31, 2023 USD ($) Investments
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	144	155
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 92,344	$ 6,324
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	940	97
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,322,533	1,436,062
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	62,418	66,004
Available-for-sale Securities, Fair Value, Total	1,414,877	1,442,386
Available-for-sale Securities, Unrealized Losses, Total	$ 63,358	$ 66,101
U.S. Treasuries [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	62	68
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 90,084	$ 4,838
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	926	90
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,300,697	1,401,669
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	59,207	62,545
Available-for-sale Securities, Fair Value, Total	1,390,781	1,406,507
Available-for-sale Securities, Unrealized Losses, Total	$ 60,133	$ 62,635
U.S. Federal Agencies [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	2	3
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 205	$ 1,100
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	2	3
Available-for-sale Securities, 12 Months or Longer, Fair Value	688
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1
Available-for-sale Securities, Fair Value, Total	893	1,100
Available-for-sale Securities, Unrealized Losses, Total	$ 3	$ 3
Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	69	74
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,188	$ 80
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	9
Available-for-sale Securities, 12 Months or Longer, Fair Value	12,455	13,261
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,737	1,677
Available-for-sale Securities, Fair Value, Total	13,643	13,341
Available-for-sale Securities, Unrealized Losses, Total	$ 1,746	$ 1,677
States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	8	6
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 867	$ 306
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	3	4
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,871	1,847
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	132	110
Available-for-sale Securities, Fair Value, Total	2,738	2,153
Available-for-sale Securities, Unrealized Losses, Total	$ 135	$ 114
Asset backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments		1
Available-for-sale Securities, 12 Months or Longer, Fair Value		$ 12,512
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses		282
Available-for-sale Securities, Fair Value, Total		12,512
Available-for-sale Securities, Unrealized Losses, Total		$ 282
Other Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	3	3
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 6,822	$ 6,773
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,341	1,390
Available-for-sale Securities, Fair Value, Total	6,822	6,773
Available-for-sale Securities, Unrealized Losses, Total	$ 1,341	$ 1,390

Loans Held for Investment and_3

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	$ 8,047,448	$ 7,656,645
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	954,942	960,944
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	1,604,132	1,486,420
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	680,807	642,643
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	288,900	283,486
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	1,335,124	1,258,744
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	260,036	244,696
Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	432,360	427,139
Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	1,436,349	1,289,452
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	469,084	476,467
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	$ 585,714	$ 586,654

Loans Held for Investment and_4

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Receivables [Abstract]
Accrued interest receivable	$ 42.8	$ 39.4

Loans Held for Investment and_5

Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]
Gains (losses) on sale of property held in other real estate owned	$ 1,300,000	$ 266,000
Interest income recognized on nonaccrual loans	0	0
Interest income that would have been recognized	1,800,000	$ 718,000
Balance of modifies loans	5,900,000		$ 5,300,000
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Other real estate	30,700,000		29,400,000
U.S. Federal Agencies [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans guaranteed by government agencies	$ 8,500,000		$ 6,700,000
Parent Company [Member]
Financing Receivable Recorded Investment [Line Items]
Percentage of loans secured by real estate	69%
BancFirst [Member]
Financing Receivable Recorded Investment [Line Items]
Loan percentage	84%
Pegasus and Worthington [Member]
Financing Receivable Recorded Investment [Line Items]
Loan percentage	16%

Loans Held for Investment and_6

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Other Real Estate Owned and Repossessed Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Summary Of Nonperforming And Restructured Assets [Abstract]
Other real estate owned and repossessed assets	$ 38,497	$ 34,200

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Rental Income and Operating Expenses (Details) - Commercial Real Estate [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Rental income	$ 3,085	$ 2,778	$ 6,026	$ 5,468
Operating expense	$ 2,673	$ 2,967	$ 4,923	$ 5,348

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Amounts Included in Nonaccrual Loans Segregated by Portfolio Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 44,021	$ 24,573
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	5,543	1,686
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	3,280	874
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	20,142	800
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	745	638
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	3,425	3,336
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	628	899
Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	2,092	3,662
Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	5,605	10,101
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	685	449
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 1,876	$ 2,128

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Credit Losses on Loans - Age Analysis of Loans Held for Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 8,047,448	$ 7,656,645
Accruing Loans 90 Days or More Past Due	4,280	9,542
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	954,942	960,944
Accruing Loans 90 Days or More Past Due	532	4,377
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,604,132	1,486,420
Accruing Loans 90 Days or More Past Due	803	913
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	680,807	642,643
Accruing Loans 90 Days or More Past Due	31
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	288,900	283,486
Accruing Loans 90 Days or More Past Due		332
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,335,124	1,258,744
Accruing Loans 90 Days or More Past Due	961	731
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	260,036	244,696
Accruing Loans 90 Days or More Past Due	250	549
Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	432,360	427,139
Accruing Loans 90 Days or More Past Due	916	579
Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,436,349	1,289,452
Accruing Loans 90 Days or More Past Due	587	1,714
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	469,084	476,467
Accruing Loans 90 Days or More Past Due	200	347
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	585,714	586,654
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	16,865	16,429
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,020	1,386
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	2,224
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	405	198
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	229	1,542
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,929	3,879
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	866	757
30 to 59 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,805	1,694
30 to 59 Days Past Due [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,857	1,501
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,166	3,248
30 to 59 Days Past Due [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	588
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	7,069	11,405
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	38	26
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	141	7,371
60 to 89 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,738	158
60 to 89 Days Past Due [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	117	206
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,144	1,204
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	152	190
60 to 89 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	937	724
60 to 89 Days Past Due [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	831	436
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	555	1,090
60 to 89 Days Past Due [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	416
90 Days and Greater [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	18,407	22,992
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,379	5,598
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,544	1,786
90 Days and Greater [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	831	800
90 Days and Greater [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	407	405
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,213	1,849
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	835	613
90 Days and Greater [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,447	1,227
90 Days and Greater [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,256	10,028
90 Days and Greater [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	495	594
90 Days and Greater [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		92
Past Due Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	42,341	50,826
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	8,437	7,010
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,685	11,381
Past Due Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,974	1,156
Past Due Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	753	2,153
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	9,286	6,932
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,853	1,560
Past Due Loans [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,189	3,645
Past Due Loans [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	7,944	11,965
Past Due Loans [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,216	4,932
Past Due Loans [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,004	92
Current Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	8,005,107	7,605,819
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	946,505	953,934
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,602,447	1,475,039
Current Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	677,833	641,487
Current Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	288,147	281,333
Current Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,325,838	1,251,812
Current Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	258,183	243,136
Current Loans [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	428,171	423,494
Current Loans [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,428,405	1,277,487
Current Loans [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	464,868	471,535
Current Loans [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 584,710	$ 586,562

Loans Held for Investment an_10

Loans Held for Investment and Allowance for Credit Losses on Loans - Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	$ 1,124,047
Fiscal year before current fiscal year	1,658,230
Two years before current fiscal year	1,498,663
Three years before current fiscal year	978,072
Four years before current fiscal year	529,805
Prior	861,507
Revolving Loans Amortized Cost Basis	1,397,124
Total Loans	8,047,448	$ 7,656,645
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	62,479
Fiscal year before current fiscal year	147,224
Two years before current fiscal year	204,593
Three years before current fiscal year	160,011
Four years before current fiscal year	102,000
Prior	226,559
Revolving Loans Amortized Cost Basis	52,076
Total Loans	954,942	960,944
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	39,257
Fiscal year before current fiscal year	104,695
Two years before current fiscal year	151,859
Three years before current fiscal year	111,308
Four years before current fiscal year	78,999
Prior	186,219
Revolving Loans Amortized Cost Basis	25,667
Total Loans	698,004
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	23,094
Fiscal year before current fiscal year	34,818
Two years before current fiscal year	49,139
Three years before current fiscal year	44,044
Four years before current fiscal year	21,710
Prior	34,604
Revolving Loans Amortized Cost Basis	24,187
Total Loans	231,596
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	128
Fiscal year before current fiscal year	7,339
Two years before current fiscal year	3,574
Three years before current fiscal year	4,489
Four years before current fiscal year	939
Prior	4,121
Revolving Loans Amortized Cost Basis	2,100
Total Loans	22,690
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	372
Two years before current fiscal year	21
Three years before current fiscal year	170
Four years before current fiscal year	352
Prior	1,615
Revolving Loans Amortized Cost Basis	122
Total Loans	2,652
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	134,947
Fiscal year before current fiscal year	365,494
Two years before current fiscal year	423,997
Three years before current fiscal year	278,687
Four years before current fiscal year	158,255
Prior	198,537
Revolving Loans Amortized Cost Basis	44,215
Total Loans	1,604,132	1,486,420
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	64,168
Fiscal year before current fiscal year	258,439
Two years before current fiscal year	283,026
Three years before current fiscal year	187,391
Four years before current fiscal year	120,052
Prior	126,177
Revolving Loans Amortized Cost Basis	41,093
Total Loans	1,080,346
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	61,660
Fiscal year before current fiscal year	104,871
Two years before current fiscal year	126,693
Three years before current fiscal year	89,290
Four years before current fiscal year	38,105
Prior	71,591
Revolving Loans Amortized Cost Basis	3,122
Total Loans	495,332
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	8,934
Fiscal year before current fiscal year	141
Two years before current fiscal year	13,635
Three years before current fiscal year	1,690
Prior	245
Total Loans	24,645
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	185
Fiscal year before current fiscal year	2,043
Two years before current fiscal year	643
Three years before current fiscal year	316
Four years before current fiscal year	98
Prior	524
Total Loans	3,809
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	117,239
Fiscal year before current fiscal year	196,548
Two years before current fiscal year	209,514
Three years before current fiscal year	42,100
Four years before current fiscal year	11,649
Prior	22,628
Revolving Loans Amortized Cost Basis	81,129
Total Loans	680,807	642,643
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	49,830
Fiscal year before current fiscal year	76,166
Two years before current fiscal year	146,196
Three years before current fiscal year	33,350
Four years before current fiscal year	9,848
Prior	7,591
Revolving Loans Amortized Cost Basis	51,139
Total Loans	374,120
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	64,768
Fiscal year before current fiscal year	118,553
Two years before current fiscal year	62,487
Three years before current fiscal year	8,296
Four years before current fiscal year	1,590
Prior	14,969
Revolving Loans Amortized Cost Basis	10,703
Total Loans	281,366
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	2,641
Fiscal year before current fiscal year	1,829
Two years before current fiscal year	0
Three years before current fiscal year	354
Four years before current fiscal year	71
Prior	68
Revolving Loans Amortized Cost Basis	19,287
Total Loans	24,250
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	0
Two years before current fiscal year	831
Three years before current fiscal year	100
Four years before current fiscal year	140
Total Loans	1,071
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	136,723
Fiscal year before current fiscal year	82,742
Two years before current fiscal year	18,575
Three years before current fiscal year	8,177
Four years before current fiscal year	110
Prior	546
Revolving Loans Amortized Cost Basis	42,027
Total Loans	288,900	283,486
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	78,419
Fiscal year before current fiscal year	48,981
Two years before current fiscal year	15,922
Three years before current fiscal year	8,162
Four years before current fiscal year	98
Prior	546
Revolving Loans Amortized Cost Basis	30,001
Total Loans	182,129
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	54,233
Fiscal year before current fiscal year	33,153
Two years before current fiscal year	2,447
Three years before current fiscal year	15
Four years before current fiscal year	12
Prior	0
Revolving Loans Amortized Cost Basis	11,630
Total Loans	101,490
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	3,503
Fiscal year before current fiscal year	408
Two years before current fiscal year	0
Three years before current fiscal year	0
Prior	0
Revolving Loans Amortized Cost Basis	396
Total Loans	4,307
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	568
Fiscal year before current fiscal year	200
Two years before current fiscal year	206
Total Loans	974
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	180,475
Fiscal year before current fiscal year	279,820
Two years before current fiscal year	258,826
Three years before current fiscal year	202,783
Four years before current fiscal year	158,845
Prior	248,825
Revolving Loans Amortized Cost Basis	5,550
Total Loans	1,335,124	1,258,744
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	134,305
Fiscal year before current fiscal year	211,033
Two years before current fiscal year	205,048
Three years before current fiscal year	162,128
Four years before current fiscal year	130,865
Prior	192,862
Revolving Loans Amortized Cost Basis	5,031
Total Loans	1,041,272
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	43,810
Fiscal year before current fiscal year	65,488
Two years before current fiscal year	50,368
Three years before current fiscal year	37,025
Four years before current fiscal year	25,620
Prior	48,645
Revolving Loans Amortized Cost Basis	519
Total Loans	271,475
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,453
Fiscal year before current fiscal year	2,576
Two years before current fiscal year	3,098
Three years before current fiscal year	2,835
Four years before current fiscal year	1,821
Prior	5,562
Total Loans	17,345
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	907
Fiscal year before current fiscal year	646
Two years before current fiscal year	312
Three years before current fiscal year	795
Four years before current fiscal year	539
Prior	1,756
Total Loans	4,955
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	77
Prior	0
Total Loans	77
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	23,361
Fiscal year before current fiscal year	40,041
Two years before current fiscal year	25,668
Three years before current fiscal year	8,029
Four years before current fiscal year	8,953
Prior	17,338
Revolving Loans Amortized Cost Basis	136,646
Total Loans	260,036	244,696
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	18,801
Fiscal year before current fiscal year	34,325
Two years before current fiscal year	21,028
Three years before current fiscal year	6,512
Four years before current fiscal year	7,196
Prior	12,957
Revolving Loans Amortized Cost Basis	54,939
Total Loans	155,758
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	3,804
Fiscal year before current fiscal year	5,198
Two years before current fiscal year	4,467
Three years before current fiscal year	1,341
Four years before current fiscal year	1,462
Prior	3,918
Revolving Loans Amortized Cost Basis	79,266
Total Loans	99,456
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	756
Fiscal year before current fiscal year	344
Two years before current fiscal year	106
Three years before current fiscal year	176
Four years before current fiscal year	295
Prior	437
Revolving Loans Amortized Cost Basis	1,507
Total Loans	3,621
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	174
Two years before current fiscal year	67
Three years before current fiscal year	0
Prior	26
Revolving Loans Amortized Cost Basis	934
Total Loans	1,201
Real Estate [Member] | Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	56,745
Fiscal year before current fiscal year	67,532
Two years before current fiscal year	67,447
Three years before current fiscal year	48,874
Four years before current fiscal year	34,957
Prior	69,446
Revolving Loans Amortized Cost Basis	87,359
Total Loans	432,360	427,139
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	26,725
Fiscal year before current fiscal year	36,340
Two years before current fiscal year	44,928
Three years before current fiscal year	31,695
Four years before current fiscal year	22,757
Prior	46,282
Revolving Loans Amortized Cost Basis	46,588
Total Loans	255,315
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	23,833
Fiscal year before current fiscal year	21,355
Two years before current fiscal year	20,788
Three years before current fiscal year	16,052
Four years before current fiscal year	9,606
Prior	19,830
Revolving Loans Amortized Cost Basis	39,081
Total Loans	150,545
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	5,833
Fiscal year before current fiscal year	8,951
Two years before current fiscal year	1,119
Three years before current fiscal year	1,076
Four years before current fiscal year	2,589
Prior	3,072
Revolving Loans Amortized Cost Basis	1,686
Total Loans	24,326
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	354
Fiscal year before current fiscal year	886
Two years before current fiscal year	612
Three years before current fiscal year	51
Four years before current fiscal year	5
Prior	262
Revolving Loans Amortized Cost Basis	4
Total Loans	2,174
Commercial Non-real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	158,385
Fiscal year before current fiscal year	232,677
Two years before current fiscal year	189,001
Three years before current fiscal year	154,351
Four years before current fiscal year	35,067
Prior	65,587
Revolving Loans Amortized Cost Basis	601,281
Total Loans	1,436,349	1,289,452
Commercial Non-real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	98,481
Fiscal year before current fiscal year	135,724
Two years before current fiscal year	155,712
Three years before current fiscal year	132,447
Four years before current fiscal year	28,731
Prior	58,159
Revolving Loans Amortized Cost Basis	421,728
Total Loans	1,030,982
Commercial Non-real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	57,646
Fiscal year before current fiscal year	94,429
Two years before current fiscal year	30,313
Three years before current fiscal year	20,608
Four years before current fiscal year	5,593
Prior	6,885
Revolving Loans Amortized Cost Basis	176,353
Total Loans	391,827
Commercial Non-real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,471
Fiscal year before current fiscal year	2,160
Two years before current fiscal year	2,183
Three years before current fiscal year	1,035
Four years before current fiscal year	235
Prior	250
Revolving Loans Amortized Cost Basis	2,637
Total Loans	9,971
Commercial Non-real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	787
Fiscal year before current fiscal year	364
Two years before current fiscal year	793
Three years before current fiscal year	255
Four years before current fiscal year	508
Prior	116
Revolving Loans Amortized Cost Basis	563
Total Loans	3,386
Commercial Non-real Estate [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
Three years before current fiscal year	6
Prior	177
Total Loans	183
Consumer Non-real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	116,415
Fiscal year before current fiscal year	173,458
Two years before current fiscal year	90,190
Three years before current fiscal year	47,920
Four years before current fiscal year	13,644
Prior	8,218
Revolving Loans Amortized Cost Basis	19,239
Total Loans	469,084	476,467
Consumer Non-real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	105,282
Fiscal year before current fiscal year	153,775
Two years before current fiscal year	77,329
Three years before current fiscal year	40,937
Four years before current fiscal year	11,724
Prior	6,655
Revolving Loans Amortized Cost Basis	12,793
Total Loans	408,495
Consumer Non-real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	9,876
Fiscal year before current fiscal year	17,288
Two years before current fiscal year	10,906
Three years before current fiscal year	5,582
Four years before current fiscal year	1,542
Prior	1,219
Revolving Loans Amortized Cost Basis	6,427
Total Loans	52,840
Consumer Non-real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,059
Fiscal year before current fiscal year	1,839
Two years before current fiscal year	1,641
Three years before current fiscal year	1,119
Four years before current fiscal year	274
Prior	276
Revolving Loans Amortized Cost Basis	15
Total Loans	6,223
Consumer Non-real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	198
Fiscal year before current fiscal year	556
Two years before current fiscal year	314
Three years before current fiscal year	282
Four years before current fiscal year	104
Prior	68
Revolving Loans Amortized Cost Basis	4
Total Loans	1,526
Oil and Gas [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	137,278
Fiscal year before current fiscal year	72,694
Two years before current fiscal year	10,852
Three years before current fiscal year	27,140
Four years before current fiscal year	6,325
Prior	3,823
Revolving Loans Amortized Cost Basis	327,602
Total Loans	585,714	$ 586,654
Oil and Gas [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	76,512
Fiscal year before current fiscal year	63,488
Two years before current fiscal year	5,807
Three years before current fiscal year	26,153
Four years before current fiscal year	5,951
Prior	3,116
Revolving Loans Amortized Cost Basis	269,441
Total Loans	450,468
Oil and Gas [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	60,737
Fiscal year before current fiscal year	9,097
Two years before current fiscal year	5,045
Three years before current fiscal year	677
Four years before current fiscal year	374
Prior	267
Revolving Loans Amortized Cost Basis	58,161
Total Loans	134,358
Oil and Gas [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	29
Fiscal year before current fiscal year	109
Three years before current fiscal year	183
Four years before current fiscal year	0
Total Loans	321
Oil and Gas [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Three years before current fiscal year	127
Prior	440
Total Loans	$ 567

Loans Held for investment an_11

Loans Held for investment and Allowance for Credit Losses on Loans - Gross charge-offs by year of origination (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	$ 29	$ 71	$ 30	$ 71
Fiscal year before current fiscal year gross charge-offs	434	224	1,703	382
Two years before current fiscal year gross charge-offs	199	135	685	249
Three years before current fiscal year gross charge-offs	52	358	251	411
Four years before current fiscal year gross charge-offs	25	29	51	70
Prior gross charge-offs	256	18	420	82
Revolving Loans Amortized Cost Basis gross charge-offs	382	15	1,928	17
Total current-period gross charge-offs	1,377	850	5,068	1,282
Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs				7
Two years before current fiscal year gross charge-offs				1
Three years before current fiscal year gross charge-offs			15	22
Four years before current fiscal year gross charge-offs				18
Total current-period gross charge-offs			15	48
Real Estate Portfolio Segment [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs			12
Three years before current fiscal year gross charge-offs	1		1
Four years before current fiscal year gross charge-offs			1
Prior gross charge-offs				3
Total current-period gross charge-offs	1		14	3
Real Estate Portfolio Segment [Member] | Construction And Development Less Than Sixty Months [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs				2
Three years before current fiscal year gross charge-offs		2		2
Total current-period gross charge-offs		2		4
Real Estate Portfolio Segment [Member] | Construction Residential Real Estate Less Than Sixty Months [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs			3
Total current-period gross charge-offs	0		3
Real Estate Portfolio Segment [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	2		3
Fiscal year before current fiscal year gross charge-offs	23		23
Two years before current fiscal year gross charge-offs		19		19
Three years before current fiscal year gross charge-offs	2	21	3	21
Four years before current fiscal year gross charge-offs	4		4
Prior gross charge-offs	36	2	57	4
Total current-period gross charge-offs	67	42	90	44
Real Estate Portfolio Segment [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs		2		4
Two years before current fiscal year gross charge-offs				19
Four years before current fiscal year gross charge-offs				1
Prior gross charge-offs			2	4
Revolving Loans Amortized Cost Basis gross charge-offs			27
Total current-period gross charge-offs		2	29	28
Real Estate Portfolio Segment [Member] | Agriculture Member
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs				4
Two years before current fiscal year gross charge-offs	6		37
Three years before current fiscal year gross charge-offs	13	301	13	317
Four years before current fiscal year gross charge-offs		1		14
Prior gross charge-offs				2
Total current-period gross charge-offs	19	302	50	337
Commercial Non Real Estate Member
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	6	42	6	42
Fiscal year before current fiscal year gross charge-offs	155	34	1,156	101
Two years before current fiscal year gross charge-offs	43	1	318	63
Three years before current fiscal year gross charge-offs	8	20	140	20
Four years before current fiscal year gross charge-offs			12
Prior gross charge-offs	190	5	316	52
Revolving Loans Amortized Cost Basis gross charge-offs	378		1,886
Total current-period gross charge-offs	780	102	3,834	278
Consumer Non Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	21	29	21	29
Fiscal year before current fiscal year gross charge-offs	256	186	500	262
Two years before current fiscal year gross charge-offs	150	115	247	147
Three years before current fiscal year gross charge-offs	28	14	79	29
Four years before current fiscal year gross charge-offs	21	28	34	37
Prior gross charge-offs	30	11	45	17
Revolving Loans Amortized Cost Basis gross charge-offs	4	15	15	17
Total current-period gross charge-offs	$ 510	398	941	538
Oil and Gas [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs		2	9	2
Two years before current fiscal year gross charge-offs			83
Total current-period gross charge-offs		$ 2	$ 92	$ 2

Loans Held for Investment an_12

Loans Held for Investment and Allowance for Credit Losses on Loans - Activity in Allowance for Credit Losses on Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	$ 97,267	$ 94,760	$ 96,800	$ 92,728
Charge- offs	(1,377)	(850)	(5,068)	(1,282)
Recoveries	378	186	521	328
Net charge-offs	(999)	(664)	(4,547)	(954)
Provision for/(benefit from) credit losses	3,358	2,824	7,373	5,146
Balance at end of period	99,626	96,920	99,626	96,920
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	7,468	6,547	7,483	6,416
Charge- offs			(15)	(48)
Recoveries	11	3	31	52
Net charge-offs	(11)	3	16	4
Provision for/(benefit from) credit losses	(109)	258	(129)	388
Balance at end of period	7,370	6,808	7,370	6,808
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	33,180	32,120	33,080	30,190
Charge- offs	(1)		(14)	(3)
Recoveries
Net charge-offs	(1)		(14)	(3)
Provision for/(benefit from) credit losses	688	1,312	801	3,245
Balance at end of period	33,867	33,432	33,867	33,432
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	6,596	3,608	3,950	3,778
Charge- offs		(2)		(4)
Recoveries		3		6
Net charge-offs		1		2
Provision for/(benefit from) credit losses	(184)	(169)	2,830	(340)
Balance at end of period	6,780	3,440	6,780	3,440
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	3,464	3,226	3,414	3,275
Charge- offs			(3)
Net charge-offs			(3)
Provision for/(benefit from) credit losses	55	327	108	278
Balance at end of period	3,519	3,553	3,519	3,553
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	4,923	4,454	4,914	4,092
Charge- offs	(67)	(42)	(90)	(44)
Recoveries	21	10	25	13
Net charge-offs	(46)	(32)	(65)	(31)
Provision for/(benefit from) credit losses	695	333	723	694
Balance at end of period	5,572	4,755	5,572	4,755
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	1,652	1,444	1,646	1,418
Charge- offs		(2)	(29)	(28)
Recoveries	3	1	8	3
Net charge-offs	3	(1)	(21)	(25)
Provision for/(benefit from) credit losses	74	218	104	268
Balance at end of period	1,729	1,661	1,729	1,661
Commercial Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	20,482	25,079	22,745	25,106
Charge- offs	(780)	(102)	(3,834)	(278)
Recoveries	280	127	313	149
Net charge-offs	(500)	25	(3,521)	(129)
Provision for/(benefit from) credit losses	1,493	23	2,251	150
Balance at end of period	21,475	25,127	21,475	25,127
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	4,335	4,232	4,401	4,132
Charge- offs	(510)	(398)	(941)	(538)
Recoveries	58	35	127	92
Net charge-offs	(452)	(363)	(814)	(446)
Provision for/(benefit from) credit losses	500	475	796	658
Balance at end of period	4,383	4,344	4,383	4,344
Oil and Gas [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	9,030	7,782	9,030	8,104
Charge- offs		(2)	(92)	(2)
Net charge-offs		(2)	(92)	(2)
Provision for/(benefit from) credit losses	(16)	(406)	76	(728)
Balance at end of period	9,014	7,374	9,014	7,374
Agriculture [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	6,137	6,268	6,137	6,217
Charge- offs	(19)	(302)	(50)	(337)
Recoveries	5	7	17	13
Net charge-offs	(14)	(295)	(33)	(324)
Provision for/(benefit from) credit losses	(206)	453	(187)	533
Balance at end of period	$ 5,917	$ 6,426	$ 5,917	$ 6,426

Loans Held for Investment an_13

Loans Held for Investment and Allowance for Credit Losses on Loans - Collateral-dependent Gross Loans Held for Investment by Collateral Type and Related Specific Allocation (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	$ 8,047,448		$ 7,656,645
Specific Allocation	99,626	$ 97,267	96,800	$ 96,920	$ 94,760	$ 92,728
Real Estate Asset [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	23,510		4,240
Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	4,541		6,683
Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	337		403
Collateral Pledged [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	28,388		11,326
Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	6,024		4,152
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	954,942		960,944
Specific Allocation	7,370	7,468	7,483	6,808	6,547	6,416
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,604,132		1,486,420
Specific Allocation	33,867	33,180	33,080	33,432	32,120	30,190
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	680,807		642,643
Specific Allocation	6,780	6,596	3,950	3,440	3,608	3,778
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	288,900		283,486
Specific Allocation	3,519	3,464	3,414	3,553	3,226	3,275
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,335,124		1,258,744
Specific Allocation	5,572	4,923	4,914	4,755	4,454	4,092
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	260,036		244,696
Specific Allocation	1,729	1,652	1,646	1,661	1,444	1,418
Real Estate [Member] | Real Estate Asset [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	643		632
Real Estate [Member] | Real Estate Asset [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	20,142		800
Real Estate [Member] | Real Estate Asset [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	618		638
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	195		189
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	79		140
Real Estate [Member] | Real Estate Asset [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,833		1,841
Real Estate [Member] | Business Assets [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	401		593
Real Estate [Member] | Other Assets [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	14		15
Real Estate [Member] | Collateral Pledged [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	643		632
Real Estate [Member] | Collateral Pledged [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	20,142		800
Real Estate [Member] | Collateral Pledged [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	618		638
Real Estate [Member] | Collateral Pledged [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	195		189
Real Estate [Member] | Collateral Pledged [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	79		140
Real Estate [Member] | Collateral Pledged [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	2,248		2,449
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	250		250
Real Estate [Member] | Specific Allocation [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	2,825		225
Real Estate [Member] | Specific Allocation [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	134		134
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	66		62
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	81		140
Real Estate [Member] | Specific Allocation [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	1,193		1,386
Commercial Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,436,349		1,289,452
Specific Allocation	21,475	20,482	22,745	25,127	25,079	25,106
Commercial Non-real Estate [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	4,140		6,090
Commercial Non-real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	87		241
Commercial Non-real Estate [Member] | Collateral Pledged [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	4,227		6,331
Commercial Non-real Estate [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	1,342		1,867
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	469,084		476,467
Specific Allocation	4,383	$ 4,335	4,401	$ 4,344	$ 4,232	$ 4,132
Consumer Non-real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	236		147
Consumer Non-real Estate [Member] | Collateral Pledged [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	236		147
Consumer Non-real Estate [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	$ 133		$ 88

Loans Held for Investment an_14

Loans Held for Investment and Allowance for Credit Losses on Loans - Transfers from Loans and Premises and Equipment to Other Real Estate Owned and Repossessed Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Noncash Investing and Financing Items [Abstract]
Other real estate owned	$ 8,995	$ 667
Repossessed assets	1,575	946
Total	$ 10,570	$ 1,613

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,900	$ 36,900
Accumulated Amortization	(21,969)	(20,196)
Net Carrying Amount	14,931	16,704
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,550	33,550
Accumulated Amortization	(18,741)	(17,027)
Net Carrying Amount	14,809	16,523
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,350	3,350
Accumulated Amortization	(3,228)	(3,169)
Net Carrying Amount	$ 122	$ 181

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) $ in Thousands	Jun. 30, 2024 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 182,263
Balance at beginning and end of period	182,263
BancFirst Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at beginning and end of period	13,767
BancFirst Community Banks [Member]
Goodwill [Line Items]
Balance at beginning and end of period	61,420
Pegasus [Member]
Goodwill [Line Items]
Balance at beginning and end of period	68,855
Worthington [Member]
Goodwill [Line Items]
Balance at beginning and end of period	32,133
Other Financial Services [Member]
Goodwill [Line Items]
Balance at beginning and end of period	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at beginning and end of period	$ 624

Subordinated Debt - Additional

Subordinated Debt - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended		6 Months Ended
	Jun. 17, 2021	Mar. 31, 2004	Feb. 29, 2004	Jun. 30, 2024
Subordinated Notes due 2036 [Member] | Private Placement [Member]
Subordinated Borrowing [Line Items]
Interest rate of securities	3.50%
Debt instrument maturity date				Jun. 30, 2036
Aggregate principal amount	$ 60,000
Net proceeds from sale of notes	$ 59,150
Debt instrument, redemption, description				the Company may redeem all, but not less than all, of the Subordinated Notes at any time upon the occurrence of a “Tier 2 Capital Event,” a “Tax Event” or an “Investment Company Event” (each as defined in the Subordinated Notes). Any such redemption is subject to obtaining the prior approval of the Board of Governors of the Federal Reserve System (or its designee). The redemption price with respect to any such redemption will be equal to 100% of the principal amount of the Subordinated Note, or portion thereof, to be redeemed, plus accrued but unpaid interest, if any, thereon to, but excluding, the redemption date.
Debt instrument, redemption price, percentage of principal amount to be redeemed				100%
Subordinated Notes due 2036 [Member] | Private Placement [Member] | Bear Interest at Fixed Rate of 3.50% [Member]
Subordinated Borrowing [Line Items]
Frequency of payment				payable semi-annually in arrears on June 30 and December 31 of each year
Debt instrument, payment terms				The Subordinated Notes initially bear interest at a fixed rate of 3.50% per annum, from and including June 17, 2021 to but excluding June 30, 2031, payable semi-annually in arrears on June 30 and December 31 of each year, commencing December 31, 2021. Then, from and including June 30, 2031, to but excluding the maturity date, the Subordinated Notes will bear interest at a floating rate equal to the benchmark (initially, three-month term SOFR), reset quarterly, plus a spread of 229 basis points, payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year. The Subordinated Notes mature on June 30, 2036.
Fixed rate				3.50%
Debt instrument, commencing date				Dec. 31, 2021
Subordinated Notes due 2036 [Member] | Private Placement [Member] | Three-Month Term SOFR [Member]
Subordinated Borrowing [Line Items]
Frequency of payment				payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year.
Debt instrument, Basis point rate				2.29%
BancFirst Capital Trust Two [Member] | Subordinated Debentures Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Interest rate of securities				7.20%
Junior subordinated notes assumed				$ 26,800
Frequency of payment				payable January 15, April 15, July 15 and October 15 of each year
Debt instrument maturity date				Mar. 31, 2034
BancFirst Capital Trust Two [Member] | Cumulative Preferred Stock [Member]
Subordinated Borrowing [Line Items]
Issue of securities		$ 1,000	$ 25,000
Cumulative trust preferred securities interest rate				7.20%

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)			6 Months Ended
	Jun. 01, 2023	May 25, 2023	Jun. 30, 2024	Jun. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cash settlement for stock options, cost			$ 0	$ 0
Deferred board fees percentage for stock units accumulation			100%
RSU's Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares for future grants			462,175
Option exercisable rate			20%
Option exercisable period			2 years
Options expire period		10 years
Options vest and exercisable Description			The restricted stock units ("RSU's") vest beginning two years from the date of grant at the rate of 20% per year for five years.
Vesting period in years			5 years
Employee Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option plan termination date	Jun. 01, 2023
Option exercisable rate			25%
Options expire period			15 years
Vesting period in years, start			4 years
Options vest and exercisable Description			and are exercisable beginning four years from the date of grant at the rate of 25% per year for four years, and expire no later than the end of fifteen years from the date of grant
Vesting period in years			4 years
Employee Plan [Member] | Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period in years			5 years
Employee Plan [Member] | RSU's Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period in years			6 years
Non-Employee Directors Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option plan termination date	Jun. 01, 2023
Option exercisable rate			25%
Option exercisable period			1 year
Options expire period			15 years
Options vest and exercisable Description			The remaining options will continue to vest and are exercisable beginning one year from the date of grant at the rate of 25% per year for four years
Vesting period in years			4 years
Banc First Deferred Stock Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option plan termination date			Dec. 31, 2030
Number of shares available for future issuance under deferred compensation plan			39,525
Number of shares of common stock distributed			5,022	17,797

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Activity Under RSU Plan (Details) - $ / shares	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Restricted Stock Units, Nonvested Beginning Balance	37,825	32,075
Restricted Stock Units, Granted	7,250
Restricted Stock Units, Forfeited	(1,500)
Restricted Stock Units, Nonvested Ending Balance	37,825
Weightage Average Grant Date Fair Value, Nonvested Beginning Balance	$ 87.23
Weightage Average Grant Date Fair Value, Granted	88.57
Weightage Average Grant Date Fair Value, Forfeited	83.61
Weightage Average Grant Date Fair Value, Nonvested Ending Balance	$ 87.63

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Accumulated Stock Units (Detail) - $ / shares	Jun. 30, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Accumulated stock units	119,115	119,575
Average price	$ 42.43	$ 40.03

Stock-Based Compensation - Su_3

Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares
Share-Based Payment Arrangement [Abstract]
Outstanding at beginning period - Options | shares	1,241,391
Options exercised | shares	(84,084)
Options canceled, forfeited, or expired | shares	(12,000)
Outstanding at ending period - Options | shares	1,145,307
Exercisable at ending period - Options | shares	502,932
Outstanding at beginning period - Wgtd. Avg. Exercise Price | $ / shares	$ 53.12
Options exercised - Wgtd. Avg. Exercise Price | $ / shares	28.8
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price | $ / shares	91.64
Outstanding at ending period - Wgtd. Avg. Exercise Price | $ / shares	54.5
Exercisable at ending period - Wgtd. Avg. Exercise Price | $ / shares	$ 37.51
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	9 years 6 months 25 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	6 years 7 months 20 days
Outstanding at ending period - Aggregate Intrinsic Value | $	$ 38,022
Exercisable at ending period - Aggregate Intrinsic Value | $	$ 25,243

Stock-Based Compensation - Opti

Stock-Based Compensation - Options Exercised Under Stock Option Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of options exercised	$ 3,254	$ 1,979	$ 5,085	$ 2,331
Cash received from options exercised	1,714	1,318	2,422	1,539
Tax benefit realized from options exercised	$ 782	$ 475	$ 1,222	$ 560

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Employee Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement Compensation Expense Items [Abstract]
Stock-based compensation expense	$ 920	$ 831	$ 1,635	$ 1,213
Tax benefit	221	200	393	292
Stock-based compensation expense, net of tax	$ 699	$ 631	$ 1,242	$ 921

Stock-Based Compensation - Unea

Stock-Based Compensation - Unearned Stock-based Compensation Expense (Detail) $ in Thousands	Jun. 30, 2024 USD ($)
Stock Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unearned stock-based compensation expense	$ 8,769
RSU's Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unearned stock-based compensation expense	$ 2,940

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail)	Jun. 30, 2024 shares
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Shares remaining to be repurchased	479,784

Stockholders' Equity - Required

Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Jun. 30, 2024 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,548,490
Total Capital To Risk Weighted Assets Actual Ratio	0.1722
Capital Required For Capital Adequacy Amount	$ 719,342
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 944,136
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Common Equity Tier 1 Risk Based Capital Amount	$ 1,363,539
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1516
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 404,630
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 629,424
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Tier 1 Risk Based Capital Amount	$ 1,389,539
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1545
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 539,507
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 764,301
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Capital Amount	$ 1,389,539
Tier 1 Capital To Quarterly Average Assets Ratio	0.111
Tier 1 Capital Required For Capital Adequacy Amount	$ 500,747
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,224,212
Total Capital To Risk Weighted Assets Actual Ratio	0.1609
Capital Required For Capital Adequacy Amount	$ 608,791
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 799,039
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 760,989
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 1,119,672
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1471
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 342,445
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 532,693
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 494,643
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065
Tier 1 Risk Based Capital Amount	$ 1,139,672
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1498
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 456,594
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 646,841
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 608,791
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 1,139,672
Tier 1 Capital To Quarterly Average Assets Ratio	0.1069
Tier 1 Capital Required For Capital Adequacy Amount	$ 426,413
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 533,017
Tier 1 Capital Required To Be Well Capitalized To Quarterly Average Assets Ratio	0.05
Pegasus [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 143,683
Total Capital To Risk Weighted Assets Actual Ratio	0.1585
Capital Required For Capital Adequacy Amount	$ 72,538
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 95,206
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 90,672
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 134,727
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1486
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 40,802
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 63,470
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 58,937
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065
Tier 1 Risk Based Capital Amount	$ 134,727
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1486
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 54,403
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 77,071
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 72,538
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 134,727
Tier 1 Capital To Quarterly Average Assets Ratio	0.1059
Tier 1 Capital Required For Capital Adequacy Amount	$ 50,900
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 63,624
Tier 1 Capital Required To Be Well Capitalized To Quarterly Average Assets Ratio	0.05
Worthington [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 53,063
Total Capital To Risk Weighted Assets Actual Ratio	0.1185
Capital Required For Capital Adequacy Amount	$ 35,810
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 47,001
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 44,763
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 48,955
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1094
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 20,143
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 31,334
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 29,096
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065
Tier 1 Risk Based Capital Amount	$ 48,955
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1094
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 26,858
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 38,048
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 35,810
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 48,955
Tier 1 Capital To Quarterly Average Assets Ratio	0.0844
Tier 1 Capital Required For Capital Adequacy Amount	$ 23,207
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 29,008
Tier 1 Capital Required To Be Well Capitalized To Quarterly Average Assets Ratio	0.05

Net Income Per Common Share - B

Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
(Numerator)
Income available to common stockholders	$ 50,641	$ 55,010	$ 100,975	$ 112,543
(Denominator)
Weighted average shares outstanding for basic earnings per common share	33,001,180	32,920,497	32,974,582	32,906,753
Dilutive effect of stock compensation	523,881	546,757	545,665	559,178
Weighted-average shares outstanding for diluted earnings per common share	33,525,061	33,467,254	33,520,247	33,465,931
Basic earnings per share	$ 1.53	$ 1.67	$ 3.06	$ 3.42
Diluted earnings per share	$ 1.51	$ 1.64	$ 3.01	$ 3.36

Net Income Per Common Share - A

Net Income Per Common Share - Average Exercise Prices of Options Excluded from Computation of Diluted Net Income Per Common Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Abstract]
Shares	260,548	305,407	262,251	307,608

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 1,440,527	$ 1,553,905
Derivative assets	$ 15,239	$ 41,099
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets	Interest Receivable and Other Assets
Derivative liabilities	$ 13,420	$ 39,176
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 1,390,782	$ 1,498,045
U.S. Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	9,683	11,770
Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	13,908	14,795
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	9,951	10,010
Asset backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	9,381	12,512
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	6,822	6,773
Level 1 Inputs [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	1,390,782	1,498,045
Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	15,239	41,099
Derivative liabilities	13,420	39,176
Level 2 Inputs [Member] | U.S. Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	9,683	11,770
Level 2 Inputs [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	13,908	14,795
Level 2 Inputs [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	9,801	9,830
Level 2 Inputs [Member] | Asset backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	9,381	12,512
Level 2 Inputs [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	6,822	6,773
Level 3 Inputs [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 150	$ 180

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the year	$ 180	$ 454
Transfers (to)/from level 2	0	(244)
Settlements	(30)	(30)
Balance at the end of the period	$ 150	$ 180

Fair Value Measurements - Asset

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Level 3 [Member] - Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 13,331	$ 13,144
Collateral Dependent Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	230	1,894
Repossessed Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	657	474
Other Real Estate Owned [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 6,838	$ 31,773

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Days from origination after which mortgage loans are sold	30 days
Amount of non-financial assets (liabilities) measured at fair value on a recurring basis	$ 0	$ 0
Non-financial assets for which no impairment was provided	$ 0	$ 0

Fair Value Measurements - Estim

Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
FINANCIAL ASSETS
Federal funds sold, Carrying Amount	$ 1,102	$ 1,316
Debt securities held for investment, Carrying Amount	838	1,190
Loans, net of allowance for credit losses, Carrying Amount	7,947,822	7,559,845
Debt securities held for investment, Fair Value	838	1,190
Loans held for sale, Fair Value	7,408	3,489
FINANCIAL LIABILITIES
Deposits, Carrying Amount	11,015,602	10,700,122
Short-term borrowings, Carrying Amount	4,264	3,351
Subordinated debt, Carrying Amount	86,129	86,101
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments, Fair Value	4,510	4,875
Letters of credit, Fair Value	671	637
Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents, Carrying Amount	2,493,292	2,397,463
Federal funds sold, Carrying Amount	1,102	1,316
Debt securities held for investment, Carrying Amount	3	5
Loans held for sale, Carrying Amount	7,408	3,489
Cash and cash equivalents, Fair Value	2,493,292	2,397,463
Federal funds sold, Fair Value	1,102	1,316
Debt securities held for investment, Fair Value	3	5
Loans held for sale, Fair Value	7,408	3,489
FINANCIAL LIABILITIES
Deposits, Carrying Amount	11,015,602	10,700,122
Short-term borrowings, Carrying Amount	4,264	3,351
Subordinated debt, Carrying Amount	86,129	86,101
Deposits, Fair Value	10,511,836	10,413,348
Short-term borrowings, Fair Value	4,264	3,351
Subordinated debt, Fair Value	77,459	79,271
Level 3 Inputs [Member]
FINANCIAL ASSETS
Debt securities held for investment, Carrying Amount	835	1,185
Loans, net of allowance for credit losses, Carrying Amount	7,947,822	7,559,845
Debt securities held for investment, Fair Value	835	1,185
Loans, net of allowance for credit losses, Fair Value	$ 8,692,589	$ 7,356,768

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Percentage share of total profit	35%
Other Assets [Member] | Oil and Gas Reserves [Member]
Derivative [Line Items]
Derivative instrument margin amount	$ 7.2
Other Liabilities [Member] | Oil and Gas Reserves [Member]
Derivative [Line Items]
Derivative instrument margin amount		$ 15.5

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Notional Amounts and Estimated Fair Values of Oil and Gas Derivative Positions Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	$ 15,239	$ 41,099
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets	Interest Receivable and Other Assets
Derivative liabilities, Estimated Fair Value	$ (13,420)	$ (39,176)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	$ 15,239	$ 41,099
Derivative liabilities, Estimated Fair Value	(13,420)	(39,176)
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member] | Oil [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, Notional Amount	3,866	3,896
Derivative liabilities, Notional Amount	(3,866)	(3,896)
Derivative assets, Estimated Fair Value	4,033	20,567
Derivative liabilities, Estimated Fair Value	(3,097)	(19,512)
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member] | Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, Notional Amount	39,502	46,140
Derivative liabilities, Notional Amount	(39,502)	(46,140)
Derivative assets, Estimated Fair Value	11,206	20,532
Derivative liabilities, Estimated Fair Value	$ (10,323)	$ (19,664)

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Company's Recognized Income Related to Activity Included in Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other	Noninterest Income, Other	Noninterest Income, Other
Oil and Natural Gas Swaps and Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income	$ 94	$ 260	$ 197	$ 349

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Company's Net Credit Exposure Relating to Oil and Gas Swaps and Options with Bank Counterparties (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Oil and Natural Gas Swaps and Options [Member]
Credit Derivatives [Line Items]
Credit exposure	$ 7,134	$ 39,527

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2024 Business_Unit
Segment Reporting [Abstract]
Number of principal business units	6

Segment Information - Results o

Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net interest income	$ 109,896	$ 105,926	$ 216,000	$ 215,082
Noninterest income	43,944	47,974	88,844	95,802
Income before taxes	65,166	69,966	129,376	144,311
Total assets	12,737,318		12,737,318		$ 12,372,042
Operating Segments [Member] | BancFirst Metropolitan Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	29,139	29,269	57,332	60,008
Noninterest income	5,562	7,090	10,731	13,177
Income before taxes	21,209	21,588	43,540	44,898
Total assets	3,365,250		3,365,250		3,598,888
Operating Segments [Member] | BancFirst Community Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	61,710	57,617	121,721	115,302
Noninterest income	16,886	19,986	32,804	39,518
Income before taxes	42,267	43,184	81,059	86,783
Total assets	7,489,606		7,489,606		7,012,905
Operating Segments [Member] | Pegasus [Member]
Segment Reporting Information [Line Items]
Net interest income	11,363	13,509	22,230	28,660
Noninterest income	339	467	659	681
Income before taxes	6,112	9,857	9,257	19,501
Total assets	1,360,612		1,360,612		1,280,618
Operating Segments [Member] | Worthington [Member]
Segment Reporting Information [Line Items]
Net interest income	4,462	4,123	8,851	8,747
Noninterest income	250	255	471	534
Income before taxes	744	791	1,413	2,421
Total assets	622,902		622,902		600,364
Operating Segments [Member] | Other Financial Services [Member]
Segment Reporting Information [Line Items]
Net interest income	1,103	1,058	2,122	2,000
Noninterest income	13,513	12,350	28,676	26,522
Income before taxes	4,139	4,298	10,474	10,462
Total assets	121,308		121,308		121,601
Operating Segments [Member] | Executive, Operations & Support [Member]
Segment Reporting Information [Line Items]
Net interest income	2,119	350	3,744	365
Noninterest income	58,064	63,688	116,492	129,831
Income before taxes	41,225	45,925	84,296	94,342
Total assets	1,392,169		1,392,169		1,307,714
Eliminations [Member]
Segment Reporting Information [Line Items]
Noninterest income	(50,670)	(55,862)	(100,989)	(114,461)
Income before taxes	(50,530)	$ (55,677)	(100,663)	$ (114,096)
Total assets	$ (1,614,529)		$ (1,614,529)		$ (1,550,048)