10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2023

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 0-14384

BancFirst Corporation

(Exact name of registrant as specified in charter)

Oklahoma	73-1221379
(State or other Jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)

100 N. Broadway Ave., Oklahoma City, Oklahoma	73102-8405
(Address of principal executive offices)	(Zip Code)

(405) 270-1086

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $1.00 Par Value Per Share	BANF	NASDAQ Global Select Market System

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐.

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (sec. 232-405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of October 31, 2023 there were 32,921,393 shares of the registrant’s Common Stock outstanding.

BancFirst Corporation

Quarterly Report on Form 10-Q

September 30, 2023

Table of Contents

Item	PART I – Financial Information	Page
1.	Financial Statements (Unaudited)	2
	Consolidated Balance Sheets	2
	Consolidated Statements of Comprehensive Income	3
	Consolidated Statements of Shareholders’ Equity	4
	Consolidated Statements of Cash Flow	5
	Notes to Consolidated Financial Statements	6
2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
3.	Quantitative and Qualitative Disclosure About Market Risk	40
4.	Controls and Procedures	40
	PART II – Other Information
1.	Legal Proceedings	41
1A.	Risk Factors	41
2.	Unregistered Sales of Equity Securities	41
3.	Defaults Upon Senior Securities	41
4.	Mine Safety Disclosures	41
5.	Other Information	41
6.	Exhibits	42
Signatures		43

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements.

BANCFIRST CORPORATION

CONSOLIDATED BALANCE SHEETS

(Dollars in thousands)

	September 30,			December 31,
	2023			2022
	(unaudited)			(see Note 1)
ASSETS
Cash and due from banks	$	202,680		$	259,049
Interest-bearing deposits with banks		2,134,081			2,909,861
Federal funds sold		6,875			2,850
Debt securities held for investment (fair value: $1,192 and $2,383, respectively)		1,192			2,383
Debt securities available for sale at fair value		1,524,256			1,538,221
Loans held for sale		3,852			6,232
Loans held for investment (net of unearned interest)		7,472,622			6,943,563
Allowance for credit losses		(97,776	)		(92,728	)
Loans, net of allowance for credit losses		7,374,846			6,850,835
Premises and equipment, net		279,607			278,088
Other real estate owned		42,390			36,756
Intangible assets, net		17,591			19,983
Goodwill		182,263			182,055
Accrued interest receivable and other assets		344,969			301,550
Total assets	$	12,114,602		$	12,387,863
LIABILITIES AND STOCKHOLDERS' EQUITY
Deposits:
Noninterest-bearing	$	4,170,550		$	4,944,730
Interest-bearing		6,363,621			6,029,498
Total deposits		10,534,171			10,974,228
Short-term borrowings		3,976			300
Accrued interest payable and other liabilities		119,785			76,455
Subordinated debt		86,086			86,044
Total liabilities		10,744,018			11,137,027
Stockholders' equity:
Senior preferred stock, $1.00 par; 10,000,000 shares authorized; none issued		—			—
Cumulative preferred stock, $5.00 par; 900,000 shares authorized; none issued		—			—
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and       outstanding: 32,921,393 and 32,875,560, respectively		32,921			32,876
Capital surplus		173,308			169,231
Retained earnings		1,241,532			1,120,292
Accumulated other comprehensive loss, net of tax benefit of $23,872       and $22,107, respectively		(77,177	)		(71,563	)
Total stockholders' equity		1,370,584			1,250,836
Total liabilities and stockholders' equity	$	12,114,602		$	12,387,863

The accompanying Notes are an integral part of these consolidated financial statements.

2

BANCFIRST CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

(Dollars in thousands, except per share data)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
INTEREST INCOME
Loans, including fees	$	121,891		$	87,078		$	340,899		$	238,758
Debt securities:
Taxable		9,260			6,793			27,659			15,716
Tax-exempt		22			22			52			71
Federal funds sold		63			24			176			30
Interest-bearing deposits with banks		28,989			20,095			87,703			29,452
Total interest income		160,225			114,012			456,489			284,027
INTEREST EXPENSE
Deposits		54,838			11,999			133,747			17,566
Short-term borrowings		49			36			261			49
Subordinated debt		1,030			1,030			3,091			3,091
Total interest expense		55,917			13,065			137,099			20,706
Net interest income		104,308			100,947			319,390			263,321
Provision for credit losses		2,312			2,863			7,458			6,300
Net interest income after provision for credit losses		101,996			98,084			311,932			257,021
NONINTEREST INCOME
Trust revenue		4,866			4,125			13,678			11,580
Service charges on deposits		17,027			22,161			60,526			65,154
Securities transactions (includes accumulated other comprehensive loss reclassifications of $0, $0, $0 and $1,536, respectively)		(361	)		966			(464	)		(2,949	)
Income from sales of loans		734			969			2,095			3,891
Insurance commissions		8,429			7,498			23,395			20,227
Cash management		8,177			5,624			22,838			13,202
Gain on sale of other assets		464			53			1,258			216
Other		5,113			7,935			16,925			24,258
Total noninterest income		44,449			49,331			140,251			135,579
NONINTEREST EXPENSE
Salaries and employee benefits		50,200			47,741			149,255			136,957
Occupancy, net		5,487			4,930			15,588			14,067
Depreciation		4,685			4,612			14,097			14,034
Amortization of intangible assets		885			880			2,645			2,568
Data processing services		1,820			1,876			6,144			5,656
Net expense from other real estate owned		2,720			2,392			8,068			3,676
Marketing and business promotion		2,034			1,945			6,461			5,609
Deposit insurance		1,419			1,202			4,495			3,526
Other		11,965			13,500			35,889			39,214
Total noninterest expense		81,215			79,078			242,642			225,307
Income before taxes		65,230			68,337			209,541			167,293
Income tax expense		14,242			12,985			46,010			31,319
Net income	$	50,988		$	55,352		$	163,531		$	135,974
NET INCOME PER COMMON SHARE
Basic	$	1.55		$	1.69		$	4.97		$	4.15
Diluted	$	1.52		$	1.65		$	4.88		$	4.07
OTHER COMPREHENSIVE (LOSS)/GAIN
Unrealized loss on debt securities, net of tax benefit of $1,919, $11,033, $1,765 and $26,492, respectively		(6,172	)		(35,752	)		(5,614	)		(85,557	)
Reclassification adjustment for loss included in net income, net of tax expense of $0, $0, $0 and $369, respectively		—			—			—			1,167
Other comprehensive loss, net of tax benefit of $1,919, $11,033, $1,765 and $26,123, respectively		(6,172	)		(35,752	)		(5,614	)		(84,390	)
Comprehensive income	$	44,816		$	19,600		$	157,917		$	51,584

The accompanying Notes are an integral part of these consolidated financial statements.

3

BANCFIRST CORPORATION

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited)

(Dollars in thousands)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2023			2022			2023			2022
COMMON STOCK
Issued at beginning of period	$	32,939		$	32,781		$	32,876		$	32,603
Shares issued for stock options		3			75			66			253
Shares acquired and canceled		(21	)		—			(21	)		—
Issued at end of period	$	32,921		$	32,856		$	32,921		$	32,856
CAPITAL SURPLUS
Balance at beginning of period	$	172,358		$	165,295		$	169,231		$	159,914
Common stock issued for stock options		86			2,295			2,000			6,758
Stock-based compensation arrangements		864			627			2,077			1,545
Balance at end of period	$	173,308		$	168,217		$	173,308		$	168,217
RETAINED EARNINGS
Balance at beginning of period	$	1,206,499		$	1,034,107		$	1,120,292		$	977,067
Net income		50,988			55,352			163,531			135,974
Dividends on common stock ($0.43, $0.40, $1.23 and $1.12  per share, respectively)		(14,156	)		(13,143	)		(40,492	)		(36,725	)
Common stock acquired and canceled		(1,799	)		—			(1,799	)		—
Balance at end of period	$	1,241,532		$	1,076,316		$	1,241,532		$	1,076,316
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized (losses)/gains on securities:
Balance at beginning of period	$	(71,005	)	$	(46,488	)	$	(71,563	)	$	2,150
Net change		(6,172	)		(35,752	)		(5,614	)		(84,390	)
Balance at end of period	$	(77,177	)	$	(82,240	)	$	(77,177	)	$	(82,240	)
Total stockholders’ equity	$	1,370,584		$	1,195,149		$	1,370,584		$	1,195,149

The accompanying Notes are an integral part of these consolidated financial statements.

4

BANCFIRST CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOW

(Unaudited)

(Dollars in thousands)

	Nine Months Ended
	September 30,
	2023			2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	163,531		$	135,974
Adjustments to reconcile to net cash provided by operating activities:
Provision for credit losses		7,458			6,300
Depreciation and amortization		16,742			16,602
Net amortization of securities premiums and discounts		(883	)		3,002
Realized securities losses		464			2,949
Gain on sales of loans		(2,095	)		(3,891	)
Cash receipts from the sale of loans originated for sale		118,786			207,972
Cash disbursements for loans originated for sale		(114,312	)		(184,129	)
Deferred income tax benefit		(2,038	)		(2,940	)
Gain on sale of other assets		(1,635	)		(4,185	)
Increase in interest receivable		(8,519	)		(11,703	)
Increase in interest payable		5,235			528
Amortization of stock-based compensation arrangements		2,077			1,545
Excess tax benefit from stock-based compensation arrangements		(775	)		(3,058	)
Other, net		6,245			14,326
Net cash provided by operating activities		190,281			179,292
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid		8,045			121,099
Net increase in federal funds sold		(4,025	)		(465	)
Purchases of available for sale debt securities		(154,104	)		(1,375,496	)
Proceeds from maturities, calls and paydowns of held for investment debt securities		1,350			72
Proceeds from maturities, calls and paydowns of available for sale debt securities		161,414			48,300
Proceeds from sales of available for sale securities		—			222,474
Purchase of equity securities		(310	)		(3,952	)
Proceeds from paydowns and sales of equity securities		531			1,378
Net change in loans		(532,471	)		(405,052	)
Net payments on derivative asset contracts		(16,817	)		(11,019	)
Purchases of premises, equipment and computer software		(17,695	)		(15,105	)
Purchase of tax credits		(6,670	)		(4,091	)
Other, net		24,756			12,547
Net cash used in investing activities		(535,996	)		(1,409,310	)
FINANCING ACTIVITIES
Net change in deposits		(450,870	)		2,537,009
Net change in short-term borrowings		3,676			4,600
Issuance of common stock in connection with stock options, net		2,066			7,011
Common stock acquired		(1,820	)		—
Cash dividends paid		(39,486	)		(35,319	)
Net cash (used in) provided by financing activities		(486,434	)		2,513,301
Net (decrease)/increase in cash, due from banks and interest-bearing deposits		(832,149	)		1,283,283
Cash, due from banks and interest-bearing deposits at the beginning of the period		3,168,910			2,050,022
Cash, due from banks and interest-bearing deposits at the end of the period	$	2,336,761		$	3,333,305
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	$	131,864		$	20,154
Cash paid during the period for income taxes	$	42,680		$	26,780
Noncash investing and financing activities:
Cash (received)/consideration for acquisitions	$	(7,833	)	$	77,685
Fair value of assets acquired in acquisitions	$	2,981		$	511,580
Liabilities assumed in acquisitions	$	10,814		$	433,896
Unpaid common stock dividends declared	$	14,156		$	13,143

The accompanying Notes are an integral part of these consolidated financial statements.

5

BANCFIRST CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(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, 2022.

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, 2022, 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 loan segments from 2022 have been reclassified to conform to the 2023 presentation. Such reclassifications had no effect on previously reported balance sheets, 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 Adopted During the Current Period:

In March 2022, FASB issued ASU No. 2022-02, “Financial Instruments – Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures.” ASU 2022-02 eliminated the Troubled Debt Restructurings (“TDR”) recognition and measurement guidance and, instead, required that the Company evaluate, based on the accounting for loan modifications, whether the modification represents a new loan or a continuation of an existing loan when a borrower is experiencing financial difficulty. In addition, the update required that the Company disclose current-period charge-offs by year of origination for financing receivables. The current-period charge-off amendment was applied prospectively. The amendments were effective for annual periods beginning after December 15, 2022, including interim periods within those annual periods. The Company adopted ASU 2022-02 on January 1, 2023. ASU No. 2022-02 did not have a significant impact on the Company’s consolidated financial statements.

In March 2023, FASB issued ASU No. 2023-02, "Investments - Equity Method and Joint Ventures (Topic 323)." ASU 2023-02 permits the election of accounting for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method, if certain conditions are met. Using the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense (benefit). The amendments are effective for annual periods beginning after December 15, 2023, including interim periods

6

within those annual periods. Early adoption is permitted for all entities in any interim period. The Company adopted the amendment as of January 1, 2023 using the modified retrospective transition. The Company has investments in New Markets Tax Credits ("NMTC") and Low-Income Housing Tax Credits ("LIHTC") that were affected by ASU 2023-02. Upon adoption of ASU No. 2023-02, the Company recorded $21.8 million in other assets and other liabilities on the consolidated balance sheet for unfunded LIHTC commitments and amortized $977,000 of NMTC investments to income tax expense during the period that would have previously been recorded to other expense. ASU No. 2023-02 did not have a significant impact on the Company’s consolidated financial statements.

(2) RECENT DEVELOPMENTS, INCLUDING MERGERS AND ACQUISITIONS

BancFirst Corporation is regulated by the Federal Reserve System as a financial holding company. On August 11, 2023, BancFirst become a Federal Reserve System member bank, which changed its primary regulator from the Federal Deposit Insurance Corporation (“FDIC”) to the Federal Reserve System. Worthington became a Federal Reserve System member bank on September 1, 2023, and Pegasus became a Federal Reserve System member bank on October 12, 2023, which changed their primary regulator from the FDIC to the Federal Reserve System.

On July 20, 2023, BancFirst purchased approximately $2.5 million in total assets, which included $2.1 million in loans, and assumed $10.8 million in deposits and other obligations, from RCB Bank's Stroud, Oklahoma branch. RCB Bank paid BancFirst $7.8 million as a result of this transaction. In addition, the Company recorded a core deposit intangible of $252,280 and goodwill of $208,752. The Company did not incur a material amount of purchase-related expenses. The effect of this purchase was included in the consolidated financial statement of the Company from the date of purchase forward. The purchase did not have a material effect on the Company's consolidated financial statements. The purchase of this branch strengthens BancFirst's presence in the Stroud, Oklahoma community.

On February 8, 2022, the Company acquired Worthington for an aggregate cash purchase price of $77.7 million. Worthington is chartered and regulated by the Texas State Banking Department with one banking location in Arlington, Texas, one in Colleyville, Texas and two in Fort Worth, Texas. At acquisition, Worthington had approximately $478 million in total assets, $257 million in loans and $430 million in deposits. Worthington will continue to operate under a separate charter and remain a separate subsidiary of the Company governed by its existing board of directors. The Company intends to provide an appropriate amount of capital or other support to increase Worthington’s ability to approve larger loans and allow Worthington to continue to grow earning assets. As a result of the acquisition, the Company recorded a core deposit intangible of $5.9 million and goodwill of $32.1 million. The Company did not incur a material amount of acquisition-related expenses. The effect of this acquisition was included in the consolidated financial statements of the Company from the date of acquisition forward. Pro forma information has not been presented because the acquisition did not have a material effect on the Company’s consolidated financial statements. The acquisition of Worthington complements the Company by expanding its Texas presence in the Dallas-Fort Worth market.

(3) SECURITIES

The following table summarizes the amortized cost and estimated fair values of debt securities held for investment:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
September 30, 2023	(Dollars in thousands)
Mortgage backed securities (1)	$	7	$	—	$	—	$	7
States and political subdivisions		685		—		—		685
Other securities		500		—		—		500
Total	$	1,192	$	—	$	—	$	1,192
December 31, 2022
Mortgage backed securities (1)	$	13	$	—	$	—	$	13
States and political subdivisions		1,870		—		—		1,870
Other securities		500		—		—		500
Total	$	2,383	$	—	$	—	$	2,383

7

The following table summarizes the amortized cost and estimated fair values of debt securities available for sale:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
September 30, 2023	(Dollars in thousands)
U.S. treasuries	$	1,564,934	$	—	$	(96,730	)	$	1,468,204
U.S. federal agencies		12,427		156		(3	)		12,580
Mortgage backed securities (1)		16,877		7		(2,472	)		14,412
States and political subdivisions		10,115		5		(189	)		9,931
Asset backed securities		12,789		—		(378	)		12,411
Other securities		8,163		—		(1,445	)		6,718
Total	$	1,625,305	$	168	$	(101,217	)	$	1,524,256
December 31, 2022
U.S. treasuries	$	1,568,563	$	—	$	(90,699	)	$	1,477,864
U.S. federal agencies		15,025		198		(1	)		15,222
Mortgage backed securities (1)		18,449		21		(1,884	)		16,586
States and political subdivisions		8,320		35		(221	)		8,134
Asset backed securities		13,371		—		(361	)		13,010
Other securities		8,163		—		(758	)		7,405
Total	$	1,631,891	$	254	$	(93,924	)	$	1,538,221

(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.

	September 30, 2023				December 31, 2022
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
	(Dollars in thousands)
Held for Investment
Contractual maturity of debt securities:
Within one year	$	350	$	350	$	1,186	$	1,186
After one year but within five years		841		841		1,195		1,195
After five years but within ten years		1		1		2		2
After ten years		—		—		—		—
Total	$	1,192	$	1,192	$	2,383	$	2,383
Available for Sale
Contractual maturity of debt securities:
Within one year	$	208,397	$	203,774	$	101,607	$	100,655
After one year but within five years		1,317,661		1,228,720		1,316,874		1,233,725
After five years but within ten years		60,974		56,159		170,513		163,101
After ten years		38,273		35,603		42,897		40,740
Total debt securities	$	1,625,305	$	1,524,256	$	1,631,891	$	1,538,221

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:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Book value of pledged securities	$	542,516	$	573,952

8

The following is a detail of proceeds from sales and the realized losses on available for sale debt securities:

	For the Nine Months Ended September 30,
	2023		2022
	(Dollars in thousands)
Proceeds	$	—	$	222,474
Gross losses realized		—		3,990

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 nine months ended September 30, 2023. During the nine months ended September 30, 2022, the Company sold $226 million of debt securities with an average yield of 0.16%, the proceeds of which were subsequently reinvested in $220 million of debt securities with an average yield of 1.86%. The Company used specific identification to reclassify the unrealized loss in other comprehensive income to a realized loss, as shown in the consolidated statements of comprehensive income.

Realized gains/losses on debt and equity securities are reported as securities transactions within the noninterest income section of the consolidated statements of comprehensive income.

The following table summarizes debt securities with unrealized losses, segregated by the duration of the unrealized loss, at September 30, 2023 and December 31, 2022 respectively:

			Less than 12 Months				More than 12 Months				Total
	Number of investments		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
			(Dollars in thousands)
September 30, 2023
Available for Sale
U.S. treasuries		71	$	93,372	$	2,708	$	1,374,832	$	94,022	$	1,468,204	$	96,730
U.S. federal agencies		3		1,260		3		—		—		1,260		3
Mortgage backed securities		83		1,242		38		12,887		2,434		14,129		2,472
States and political subdivisions		9		1,657		21		1,292		168		2,949		189
Asset backed securities		1		—		—		12,411		378		12,411		378
Other securities		3		—		—		6,718		1,445		6,718		1,445
Total		170	$	97,531	$	2,770	$	1,408,140	$	98,447	$	1,505,671	$	101,217
December 31, 2022
Available for Sale
U.S. treasuries		74	$	787,925	$	27,078	$	689,939	$	63,621	$	1,477,864	$	90,699
U.S. federal agencies		1		—		—		349		1		349		1
Mortgage backed securities		92		10,001		1,239		5,055		645		15,056		1,884
States and political subdivisions		8		2,308		184		464		37		2,772		221
Asset backed securities		1		13,010		361		—		—		13,010		361
Other securities		3		4,871		291		2,534		467		7,405		758
Total		179	$	818,115	$	29,153	$	698,341	$	64,771	$	1,516,456	$	93,924

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 September 30, 2023 and December 31, 2022, 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.

9

(4) LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES ON LOANS

Loans held for investment are summarized by portfolio segment as follows:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Real estate:
Commercial real estate owner occupied		960,868		908,494
Commercial real estate non-owner occupied		1,443,831		1,383,150
Construction and development < 60 months		575,652		475,236
Construction residential real estate < 60 months		274,311		303,305
Residential real estate first lien		1,216,508		1,117,899
Residential real estate all other		230,397		196,198
Agriculture		425,930		408,037
Commercial non-real estate		1,296,796		1,241,454
Consumer non-real estate		475,721		446,756
Oil and gas		572,608		463,034
Total (1)	$	7,472,622	$	6,943,563
(1) Excludes accrued interest receivable of $37.8 million at September 30, 2023 and $30.6 million at December 31, 2022, that is recorded in accrued interest receivable and other assets.

Certain loan segments for 2022 were reclassified to conform to the 2023 presentation. Each loan segment consists of loan categories possessing similar risk characteristics. The Company’s re-alignment of the segments primarily consisted of reclassifying farmland and agriculture related loans that were previously included in consumer-related and commercial-related loans to the agriculture category. Management believes this accurately represents the risk profile of each loan segment. These reclassifications did not have a significant impact on the allowance for credit losses.

The Company's loans are currently 85% held by BancFirst and 15% 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 securities. The Company’s interest in collateral is secured through filing mortgages and liens, and in some cases, 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, 2022.

Loan Modifications, Other Real Estate Owned and Repossessed Assets and Held for Sale Assets

The following is a summary of other real estate owned and repossessed assets:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Other real estate owned and repossessed assets	$	42,782	$	36,936

As of both September 30, 2023 and December 31, 2022, other real estate owned included a commercial real estate property recorded at approximately $32.7 million and $29.4 million, respectively. 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 other 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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)
Rental income	$	2,911	$	2,437	$	8,379	$	7,750
Operating expense		2,690		2,381		8,038		7,120

10

During the nine months ended September 30, 2023, the Company sold property held in other real estate owned for a total gain of $342,000, compared to a total gain of $4.0 million in the nine months ended September 30, 2022.

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 modified loans was approximately $8.4 million during the period ended September 30, 2023.

Nonaccrual loans

The Company did not recognize any interest income on nonaccrual loans for either of the nine months ended September 30, 2023 or 2022. In addition, there were no nonaccrual loans for which there is no related allowance for credit losses at both September 30, 2023 and December 31, 2022. Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $1.1 million for the nine months ended September 30, 2023 and approximately $992,000 for the nine months ended September 30, 2022.

Nonaccrual loans guaranteed by government agencies totaled approximately $5.7 million at September 30, 2023 and approximately $4.7 million at December 31, 2022.

The following table is a summary of amounts included in nonaccrual loans, segregated by portfolio segment.

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Real estate:
Commercial real estate owner occupied	$	2,082	$	1,795
Commercial real estate non-owner occupied		674		667
Construction and development < 60 months		802		93
Construction residential real estate < 60 months		366		430
Residential real estate first lien		2,734		1,947
Residential real estate all other		833		55
Agriculture		2,305		2,734
Commercial non-real estate		6,465		7,066
Consumer non-real estate		332		192
Oil and gas		83		320
Total	$	16,676	$	15,299

11

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
(Dollars in thousands)	30-59 Days Past Due		60-89 Days Past Due		90 Days and Greater		Total Past Due Loans		Current Loans		Total Loans		Accruing Loans 90 Days or More Past Due
As of September 30, 2023
Real estate:
Commercial real estate owner occupied	$	1,490	$	671	$	6,522	$	8,683	$	952,185	$	960,868	$	4,928
Commercial real estate non-owner occupied		—		40		1,198		1,238		1,442,593		1,443,831		524
Construction and development < 60 months		9,161		—		1,186		10,347		565,305		575,652		384
Construction residential real estate < 60 months		424		97		543		1,064		273,247		274,311		543
Residential real estate first lien		3,104		543		2,877		6,524		1,209,984		1,216,508		1,120
Residential real estate all other		647		252		861		1,760		228,637		230,397		100
Agriculture		3,413		380		3,925		7,718		418,212		425,930		3,166
Commercial non-real estate		3,439		1,226		5,589		10,254		1,286,542		1,296,796		1,323
Consumer non-real estate		2,322		635		462		3,419		472,302		475,721		353
Oil and gas		115		—		217		332		572,276		572,608		134
Total	$	24,115	$	3,844	$	23,380	$	51,339	$	7,421,283	$	7,472,622	$	12,575
	30-59 Days Past Due		60-89 Days Past Due		90 Days and Greater		Total Past Due Loans		Current Loans		Total Loans		Accruing Loans 90 Days or More Past Due
As of December 31, 2022
Real estate:
Commercial real estate owner occupied	$	1,314	$	1,524	$	4,580	$	7,418	$	901,076	$	908,494	$	4,580
Commercial real estate non-owner occupied		6,237		—		42		6,279		1,376,871		1,383,150		43
Construction and development < 60 months		535		40		114		689		474,547		475,236		81
Construction residential real estate < 60 months		1,320		282		148		1,750		301,555		303,305		—
Residential real estate first lien		3,415		1,076		844		5,335		1,112,564		1,117,899		349
Residential real estate all other		265		37		185		487		195,711		196,198		166
Agriculture		2,357		34		2,265		4,656		403,381		408,037		1,054
Commercial non-real estate		2,490		2,142		2,772		7,404		1,234,050		1,241,454		345
Consumer non-real estate		2,591		648		585		3,824		442,932		446,756		467
Oil and gas		654		—		—		654		462,380		463,034		—
Total	$	21,178	$	5,783	$	11,535	$	38,496	$	6,905,067	$	6,943,563	$	7,085

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 classification 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, 2022, are disclosed in Note (5) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

The Company’s revolving loans that are converted to term loans are not material and therefore have not been presented.

12

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)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
As of September 30, 2023
Commercial real estate owner occupied
Grade 1	$	99,990	$	155,460	$	120,444	$	87,838	$	82,081	$	139,298	$	23,622	$	708,733
Grade 2		29,812		57,975		37,289		23,581		21,509		30,107		34,361		234,634
Grade 3		142		3,582		4,304		652		1,899		1,075		2,437		14,091
Grade 4		27		159		200		850		665		1,020		150		3,071
Grade 5		—		—		—		—		339		—		—		339
Total commercial real estate owner occupied		129,971		217,176		162,237		112,921		106,493		171,500		60,570		960,868
Commercial real estate non-owner occupied
Grade 1	$	160,303	$	255,862	$	176,995	$	122,636	$	59,973	$	72,918	$	47,780	$	896,467
Grade 2		74,860		155,293		81,452		53,753		62,989		73,789		28,722		530,858
Grade 3		—		6,736		1,717		149		6,207		299		—		15,108
Grade 4		200		632		—		—		—		566		—		1,398
Total commercial real estate non-owner occupied		235,363		418,523		260,164		176,538		129,169		147,572		76,502		1,443,831
Construction and development < 60 months
Grade 1	$	91,548	$	123,068	$	73,070	$	8,484	$	6,842	$	5,403	$	61,474	$	369,889
Grade 2		59,837		50,514		33,168		6,629		13,572		2,381		34,350		200,451
Grade 3		3,308		893		102		97		—		7		—		4,407
Grade 4		—		903		—		—		—		2		—		905
Total construction and development < 60 months		154,693		175,378		106,340		15,210		20,414		7,793		95,824		575,652
Construction residential real estate < 60 months
Grade 1	$	136,871	$	36,431	$	1,441	$	102	$	2	$	37	$	37,179	$	212,063
Grade 2		44,707		9,530		32		22		—		382		549		55,222
Grade 3		5,730		387		—		—		—		—		—		6,117
Grade 4		366		543		—		—		—		—		—		909
Total construction residential real estate < 60 months		187,674		46,891		1,473		124		2		419		37,728		274,311
Residential real estate first lien
Grade 1	$	223,552	$	238,614	$	177,122	$	121,747	$	74,016	$	155,802	$	2,918	$	993,771
Grade 2		41,655		40,971		39,280		25,018		13,617		43,460		—		204,001
Grade 3		2,282		1,902		2,626		1,327		1,606		4,202		—		13,945
Grade 4		384		172		1,246		346		440		2,203		—		4,791
Total residential real estate first lien		267,873		281,659		220,274		148,438		89,679		205,667		2,918		1,216,508
Residential real estate all other
Grade 1	$	35,422	$	27,339	$	8,166	$	8,242	$	3,963	$	13,045	$	41,474	$	137,651
Grade 2		2,828		5,088		2,210		1,958		1,546		3,272		71,527		88,429
Grade 3		416		353		74		42		41		440		1,925		3,291
Grade 4		—		24		—		—		95		45		862		1,026
Total residential real estate all other		38,666		32,804		10,450		10,242		5,645		16,802		115,788		230,397
Agriculture
Grade 1	$	47,552	$	55,420	$	35,685	$	29,284	$	17,863	$	33,652	$	39,462	$	258,918
Grade 2		28,366		24,237		19,989		10,303		9,369		17,304		35,554		145,122
Grade 3		8,891		856		854		3,433		323		2,696		2,896		19,949
Grade 4		41		901		217		134		384		244		20		1,941
Total Agriculture		84,850		81,414		56,745		43,154		27,939		53,896		77,932		425,930
Commercial non-real estate
Grade 1	$	204,828	$	186,934	$	167,915	$	40,328	$	39,003	$	39,326	$	281,116	$	959,450
Grade 2		80,383		43,067		25,617		15,244		10,064		9,171		137,965		321,511
Grade 3		1,840		3,149		1,073		163		563		1,103		2,648		10,539
Grade 4		1,038		1,408		304		690		309		129		1,154		5,032
Grade 5		—		—		—		—		264		—		—		264
Total commercial non-real estate		288,089		234,558		194,909		56,425		50,203		49,729		422,883		1,296,796
Consumer non-real estate
Grade 1	$	175,483	$	123,675	$	64,280	$	22,331	$	10,804	$	3,518	$	24,688	$	424,779
Grade 2		15,347		16,509		7,792		2,502		809		1,614		1,764		46,337
Grade 3		562		1,198		957		325		285		155		12		3,494
Grade 4		123		402		384		103		85		12		2		1,111
Total consumer non-real estate		191,515		141,784		73,413		25,261		11,983		5,299		26,466		475,721
Oil and gas
Grade 1	$	157,820	$	26,772	$	52,090	$	9,850	$	1,630	$	16,141	$	170,256	$	434,559
Grade 2		41,447		7,180		1,999		414		306		217		83,009		134,572
Grade 3		134		1,922		413		2		13		167		743		3,394
Grade 4		—		83		—		—		—		—		—		83
Total oil and gas		199,401		35,957		54,502		10,266		1,949		16,525		254,008		572,608
Total loans held for investment	$	1,778,095	$	1,666,144	$	1,140,507	$	598,579	$	443,476	$	675,202	$	1,170,619	$	7,472,622

13

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
(Dollars in thousands)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
Three months ended September 30, 2023
Commercial real estate owner occupied
Current-period gross charge-offs	$	174	$	189	$	25	$	112	$	147	$	158	$	—	$	805
Commercial real estate non-owner occupied
Current-period gross charge-offs		—		—		—		—		—		—		—		—
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		—		—		71		11		—		18		—		100
Residential real estate all other
Current-period gross charge-offs		—		—		—		—		—		—		—		—
Agriculture
Current-period gross charge-offs		—		150		9		—		—		—		—		159
Commercial non-real estate
Current-period gross charge-offs		19		15		46		—		51		108		—		239
Consumer non-real estate
Current-period gross charge-offs		192		146		56		12		1		18		2		427
Oil and gas
Current-period gross charge-offs		—		—		—		—		—		—		—		—
Total current-period gross charge-offs	$	385	$	500	$	207	$	135	$	199	$	302	$	2	$	1,730

	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans
(Dollars in thousands)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
Nine months ended September 30, 2023
Commercial real estate owner occupied
Current-period gross charge-offs	$	174	$	196	$	26	$	134	$	165	$	158	$	—	$	853
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		—		—		90		32		—		22		—		144
Residential real estate all other
Current-period gross charge-offs		—		4		19		—		1		4		—		28
Agriculture
Current-period gross charge-offs		—		154		9		317		14		2		—		496
Commercial non-real estate
Current-period gross charge-offs		61		116		109		20		51		160		—		517
Consumer non-real estate
Current-period gross charge-offs		221		408		203		41		38		35		19		965
Oil and gas
Current-period gross charge-offs		—		2		—		—		—		—		—		2
Total current-period gross charge-offs	$	456	$	882	$	456	$	546	$	269	$	384	$	19	$	3,012

14

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 CECL model. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist.

The following table details 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 beginning of period		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Three Months Ended September 30, 2023
Real estate:
Commercial real estate owner occupied	$	6,808	$	(805	)	$	3	$	(802	)	$	809		$	6,815
Commercial real estate non-owner occupied		33,432		—			—		—			1,182			34,614
Construction and development < 60 months		3,440		—			3		3			467			3,910
Construction residential real estate < 60 months		3,553		—			—		—			(9	)		3,544
Residential real estate first lien		4,755		(100	)		—		(100	)		109			4,764
Residential real estate all other		1,661		—			1		1			3			1,665
Agriculture		6,426		(159	)		—		(159	)		166			6,433
Commercial non-real estate		25,127		(239	)		243		4			(886	)		24,245
Consumer non-real estate		4,344		(427	)		24		(403	)		448			4,389
Oil and gas		7,374		—			—		—			23			7,397
Total	$	96,920	$	(1,730	)	$	274	$	(1,456	)	$	2,312		$	97,776

	Allowance for Credit Losses
	Balance at beginning of period		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Nine Months Ended September 30, 2023
Real estate:
Commercial real estate owner occupied	$	6,416	$	(853	)	$	55	$	(798	)	$	1,197		$	6,815
Commercial real estate non-owner occupied		30,190		(3	)		—		(3	)		4,427			34,614
Construction and development < 60 months		3,778		(4	)		9		5			127			3,910
Construction residential real estate < 60 months		3,275		—			—		—			269			3,544
Residential real estate first lien		4,092		(144	)		13		(131	)		803			4,764
Residential real estate all other		1,418		(28	)		4		(24	)		271			1,665
Agriculture		6,217		(496	)		13		(483	)		699			6,433
Commercial non-real estate		25,106		(517	)		392		(125	)		(736	)		24,245
Consumer non-real estate		4,132		(965	)		116		(849	)		1,106			4,389
Oil and gas		8,104		(2	)		—		(2	)		(705	)		7,397
Total	$	92,728	$	(3,012	)	$	602	$	(2,410	)	$	7,458		$	97,776

15

	Allowance for Credit Losses
	Balance at beginning of period		Initial allowance on loans purchased with credit deterioration			Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Three Months Ended September 30, 2022
Real estate:
Commercial real estate owner occupied	$	6,928	$	—		$	—		$	426	$	426		$	(231	)	$	7,123
Commercial real estate non-owner occupied		16,315		—			—			—		—			7,371			23,686
Construction and development < 60 months		3,680		—			—			3		3			461			4,144
Construction residential real estate < 60 months		1,183		—			—			—		—			1,124			2,307
Residential real estate first lien		3,355		—			(11	)		15		4			(18	)		3,341
Residential real estate all other		1,480		—			(2	)		1		(1	)		84			1,563
Agriculture		7,956		—			(80	)		1		(79	)		629			8,506
Commercial non-real estate		25,370		(4	)		(187	)		26		(161	)		(251	)		24,954
Consumer non-real estate		4,050		(3	)		(171	)		59		(112	)		270			4,205
Oil and gas		16,618		—			—			—		—			(6,576	)		10,042
Total	$	86,935	$	(7	)	$	(451	)	$	531	$	80		$	2,863		$	89,871

	Allowance for Credit Losses
	Balance at beginning of period		Initial allowance on loans purchased with credit deterioration		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Nine Months Ended September 30, 2022
Real estate:
Commercial real estate owner occupied	$	7,550	$	—	$	(20	)	$	504	$	484		$	(911	)	$	7,123
Commercial real estate non-owner occupied		16,807		—		—			—		—			6,879			23,686
Construction and development < 60 months		3,454		—		—			8		8			682			4,144
Construction residential real estate < 60 months		1,051		—		—			—		—			1,256			2,307
Residential real estate first lien		3,048		2		(60	)		28		(32	)		323			3,341
Residential real estate all other		1,567		—		(38	)		403		365			(369	)		1,563
Agriculture		8,392		—		(205	)		8		(197	)		311			8,506
Commercial non-real estate		25,565		44		(961	)		162		(799	)		144			24,954
Consumer non-real estate		3,694		25		(404	)		139		(265	)		751			4,205
Oil and gas		12,808		—		—			—		—			(2,766	)		10,042
Total	$	83,936	$	71	$	(1,688	)	$	1,252	$	(436	)	$	6,300		$	89,871

Purchased Credit Deteriorated Loans

The Company has 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 nine month period ended September 30, 2023. The credit-deteriorated loans purchased during the nine months ended September 30, 2022 were as follows:

	Loans acquired with deteriorated credit quality
	(Dollars in thousands)
For the period ended September 30, 2022
Purchase price of loans at acquisition	$	661
Allowance for credit losses at acquisition		71
Par value of acquired loans at acquisition	$	732

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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 nine months ended September 30, 2023 and 2022, no material amount of interest income was recognized on collateral-dependent loans subsequent to their classification as collateral-dependent. The following table summarizes collateral-dependent gross loans held for investment by collateral type and the related specific allocation as follows:

	Collateral Type
	Real Estate		Business Assets		Energy Reserves		Other Assets		Total		Specific Allocation
	(Dollars in thousands)
As of September 30, 2023
Real estate:
Commercial real estate owner occupied	$	—	$	—	$	—	$	—	$	—	$	—
Commercial real estate non-owner occupied		632		—		—		—		632		250
Construction and development < 60 months		—		—		—		—		—		—
Construction residential real estate < 60 months		366		—		—		—		366		45
Residential real estate first lien		214		—		—		—		214		65
Residential real estate all other		57		—		—		—		57		60
Agriculture		3,191		603		—		3,039		6,833		2,586
Commercial non-real estate		—		4,902		—		37		4,939		1,229
Consumer non-real estate		—		14		—		79		93		65
Oil and gas		—		—		—		—		—		—
Total collateral-dependent loans held for investment	$	4,460	$	5,519	$	—	$	3,155	$	13,134	$	4,300
	Collateral Type
	Real Estate		Business Assets		Energy Reserves		Other Assets		Total		Specific Allocation
	(Dollars in thousands)
As of December 31, 2022
Real estate:
Commercial real estate owner occupied	$	2,213	$	—	$	—	$	—	$	2,213	$	870
Commercial real estate non-owner occupied		1,263		—		—		—		1,263		333
Construction and development < 60 months		—		—		—		—		—		—
Construction residential real estate < 60 months		420		—		—		—		420		45
Residential real estate first lien		481		—		—		—		481		207
Residential real estate all other		9		—		—		—		9		9
Agriculture		3,447		701		—		3,592		7,740		3,114
Commercial non-real estate		—		5,924		—		4		5,928		1,938
Consumer non-real estate		—		—		—		117		117		81
Oil and gas		—		—		—		—		—		—
Total collateral-dependent loans held for investment	$	7,833	$	6,625	$	—	$	3,713	$	18,171	$	6,597

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:

	Nine Months Ended September 30,
	2023		2022
	(Dollars in thousands)
Other real estate owned	$	2,236	$	4,393
Repossessed assets		1,448		696
Total	$	3,684	$	5,089

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(5) INTANGIBLE ASSETS AND GOODWILL

The following is a summary of intangible assets as of the date listed:

	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(Dollars in thousands)
September 30, 2023
Core deposit intangibles	$	33,550	$	(16,170	)	$	17,380
Customer relationship intangibles		3,350		(3,139	)		211
Total	$	36,900	$	(19,309	)	$	17,591
December 31, 2022
Core deposit intangibles	$	33,298	$	(13,615	)	$	19,683
Customer relationship intangibles		3,350		(3,050	)		300
Total	$	36,648	$	(16,665	)	$	19,983

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)
Nine months ended September 30, 2023
Balance at beginning of period	$	13,767	$	61,212	$	68,855	$	32,133	$	5,464	$	624	$	182,055
Acquisitions		—		208		—		—		—		—		208
Balance at end of period	$	13,767	$	61,420	$	68,855	$	32,133	$	5,464	$	624	$	182,263

The Company purchased a branch from RCB bank on July 20, 2023, which added goodwill as shown in the table above. See Note (2) of the Notes to the Consolidated Financial Statements for disclosure regarding the Company's recent developments, including mergers and acquisitions.

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, 2022.

(6) 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 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 were callable at par, in whole or in part, after 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 have been structured to qualify as Tier 2 capital under bank regulatory guidelines. The net proceeds to the Company from the sale of the Subordinated Notes were approximately $59.15 million after deducting commissions and offering expenses of $850,000. The Company used the proceeds from the sale of the Subordinated Notes for general

18

corporate purposes. The Subordinated Notes will 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.

(7) 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 September 30, 2023 there were 490,925 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
Nine Months Ended September 30, 2023
Nonvested at December 31, 2022		—
Granted		9,075	$	96.39
Nonvested at September 30, 2023		9,075

The Company has had the BancFirst Corporation Directors’ Deferred Stock Compensation Plan (the “Deferred Stock Compensation Plan”) since May 1999. As of September 30, 2023, there are 20,262 shares available for future issuance under the Deferred Stock Compensation Plan. The Deferred Stock Compensation Plan will terminate on December 31, 2024, 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 18,136 and 16,684 shares of common stock distributed from the Deferred Stock Compensation Plan during the nine months ended September 30, 2023 and 2022, respectively.

A summary of the accumulated stock units is as follows:

	September 30,		December 31,
	2023		2022
Accumulated stock units		117,499		129,609
Average price	$	39.20	$	34.91

The Company had the BancFirst Corporation Stock Option Plan (the “Employee Plan”), which was terminated 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.

19

The Company had the BancFirst Corporation Non-Employee Directors’ Stock Option Plan (the “Non-Employee Directors’ Plan”), which was terminated 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)
Nine Months Ended September 30, 2023
Outstanding at December 31, 2022		1,310,290		$	52.51
Exercised		(48,399	)		33.34
Canceled, forfeited, or expired		(8,500	)		87.97
Outstanding at September 30, 2023		1,253,391			53.01	9.94 Yrs.	$	42,268
Exercisable at September 30, 2023		502,891			33.32	6.43 Yrs.	$	26,857

The following table has additional information regarding options exercised under both the Employee Plan and the Non-Employee Directors’ Plan:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Total intrinsic value of options exercised	$	176	$	5,638	$	2,507	$	14,581
Cash received from options exercised		75		2,285		1,614		6,577
Tax benefit realized from options exercised		43		1,355		603		3,505

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model and is based on certain assumptions including risk-free rate of return, dividend yield, stock price volatility and the expected term. The fair value of each option is expensed over its vesting period. The risk-free interest rate is determined by reference to the spot zero-coupon rate for the U.S. Treasury security with a maturity similar to the expected term of the options. The dividend yield is the expected yield for the expected term. The stock price volatility is estimated from the recent historical volatility of the Company’s stock. The expected term is estimated from the historical option exercise experience. The Company accounts for forfeitures as they occur. No stock options were granted during the nine months ended September 30, 2023.

The following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented:

	Nine Months Ended September 30,
	2023		2022
Weighted average grant-date fair value per share of options granted	$	—	$	30.72
Risk-free interest rate		—	1.75 to 3.25%
Dividend yield		—	2.00%
Stock price volatility		—	34.61 to 34.85%
Expected term		—	10 Yrs

The Company currently uses newly issued shares for stock option exercises and restricted stock units, 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 nine months ended September 30, 2023 or September 30, 2022.

20

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Stock-based compensation expense	$	864	$	627	$	2,077	$	1,545
Tax benefit		208		151		500		372
Stock-based compensation expense, net of tax	$	656	$	476	$	1,577	$	1,173

The Company will continue to amortize the unearned stock-based compensation expense over the remaining weighted average vesting period of approximately 5 years for unvested stock options and 6 years for unvested RSUs. The following table shows the unearned stock-based compensation expense for unvested stock options and unvested RSUs:

	September 30, 2023
	(Dollars in thousands)
Unearned stock-based compensation expense for unvested stock options	$	10,957
Unearned stock-based compensation expense for unvested RSUs		850

(8) STOCKHOLDERS’ EQUITY

In November 1999, the Company adopted 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 may be determined by management and approved by the Company’s Executive Committee.

The following table is a summary of the shares purchased under the program during the period indicated and the shares remaining to be repurchased in the program:

	For the Nine Months Ended September 30,
	2023		2022
Number of shares repurchased		20,702		—
Average price of shares repurchased	$	87.88	$	—
Shares remaining to be repurchased		479,784		500,486

21

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 BancFirst Corporation’s, BancFirst’s, Pegasus’s and Worthington's 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 September 30, 2023, BancFirst Corporation, BancFirst, Pegasus and Worthington 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 September 30, 2023:
Total Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,430,965	16.90%	$	677,482	8.00%	$	889,196	10.50%	N/A		N/A
BancFirst		1,189,612	16.36%		581,616	8.00%		763,371	10.50%	$	727,020	10.00%
Pegasus		143,898	18.16%		63,389	8.00%		83,199	10.50%		79,237	10.00%
Worthington		50,731	12.92%		31,401	8.00%		41,214	10.50%		39,251	10.00%
Common Equity Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,247,907	14.74%	$	381,084	4.50%	$	592,797	7.00%	N/A		N/A
BancFirst		1,083,583	14.90%		327,159	4.50%		508,914	7.00%	$	472,563	6.50%
Pegasus		135,463	17.10%		35,657	4.50%		55,466	7.00%		51,504	6.50%
Worthington		46,814	11.93%		17,663	4.50%		27,476	7.00%		25,513	6.50%
Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,273,907	15.04%	$	508,112	6.00%	$	719,825	8.50%	N/A		N/A
BancFirst		1,103,583	15.18%		436,212	6.00%		617,967	8.50%	$	581,616	8.00%
Pegasus		135,463	17.10%		47,542	6.00%		67,351	8.50%		63,389	8.00%
Worthington		46,814	11.93%		23,551	6.00%		33,363	8.50%		31,401	8.00%
Tier 1 Capital
(to Quarterly Average Assets)-
BancFirst Corporation	$	1,273,907	10.70%	$	476,200	4.00%	N/A		N/A	N/A		N/A
BancFirst		1,103,583	10.85%		406,769	4.00%	N/A		N/A	$	508,461	5.00%
Pegasus		135,463	11.26%		48,117	4.00%	N/A		N/A		60,146	5.00%
Worthington		46,814	8.88%		21,086	4.00%	N/A		N/A		26,358	5.00%

As of September 30, 2023, the most recent notifications from the Federal Reserve Bank of Kansas City, the FDIC and the Comptroller of the Currency, categorized BancFirst, Pegasus and Worthington 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 have continued to be included in Tier 1 capital, as the Company’s total assets do not exceed $15 billion. The Company's Subordinated Notes have been structured to qualify as Tier 2 capital under bank regulatory guidelines. There are no conditions or events since the most recent notifications to BancFirst Corporation, BancFirst, Pegasus and Worthington of their capital category that management believes would materially change their category under capital requirements existing as of the report date.

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(9) NET INCOME PER COMMON SHARE

Basic and diluted net income per common share are calculated as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands, except per share data)
(Numerator)
Income available to common stockholders	$	50,988	$	55,352	$	163,531	$	135,974
(Denominator)
Weighted average shares outstanding for basic earnings per common share		32,937,149		32,825,931		32,916,996		32,748,116
Dilutive effect of stock compensation		602,240		710,627		576,019		681,045
Weighted-average shares outstanding for diluted earnings per common share		33,539,389		33,536,558		33,493,015		33,429,161
Basic earnings per share	$	1.55	$	1.69	$	4.97	$	4.15
Diluted earnings per share	$	1.52	$	1.65	$	4.88	$	4.07

The following table shows the number of options and RSUs 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 September 30, 2023		263,176
Three Months Ended September 30, 2022		184,707
Nine Months Ended September 30, 2023		278,828
Nine Months Ended September 30, 2022		149,669

(10) 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.

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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 the 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 a small amount of municipal revenue bonds. Pricing for such instruments is fairly generic and 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)
September 30, 2023
Debt securities available for sale:
U.S. Treasury	$	1,468,204	$	—	$	—	$	1,468,204
U.S. federal agencies		—		12,580		—		12,580
Mortgage-backed securities		—		14,412		—		14,412
States and political subdivisions		—		9,502		429		9,931
Asset backed securities		—		12,411		—		12,411
Other debt securities		—		6,718		—		6,718
Derivative assets		—		21,686		—		21,686
Derivative liabilities		—		19,558		—		19,558
December 31, 2022
Debt securities available for sale:
U.S. Treasury	$	1,477,864	$	—	$	—	$	1,477,864
U.S. federal agencies		—		15,222		—		15,222
Mortgage-backed securities		—		16,586		—		16,586
States and political subdivisions		—		7,680		454		8,134
Asset backed securities		—		13,010		—		13,010
Other debt securities				7,405				7,405
Derivative assets		—		20,745		—		20,745
Derivative liabilities		—		19,683		—		19,683

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The changes in Level 3 assets measured at estimated fair value on a recurring basis during the periods presented were as follows:

	Nine Months Ended September 30,			Twelve Months Ended December 31,
	2023			2022
	(Dollars in thousands)
Balance at the beginning of the year	$	454		$	320
Purchases		—			255
Settlements		(30	)		(110	)
Total unrealized gain		5			(11	)
Balance at the end of the period	$	429		$	454

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 nine months ended September 30, 2023, the Company did not transfer any debt securities. In addition, during the year ended December 31, 2022, the Company did not transfer any debt securities.

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; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These 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 September 30, 2023
Equity securities	$	14,827
Collateral dependent loans		363
Repossessed assets		348
Other real estate owned		6,453
As of and for the Year-to-date Period Ended December 31, 2022
Equity securities	$	15,512
Collateral dependent loans		1,618
Repossessed assets		180
Other real estate owned		34,999

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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 were 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.

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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:

	September 30, 2023				December 31, 2022
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Dollars in thousands)
FINANCIAL ASSETS
Level 2 inputs:
Cash and cash equivalents	$	2,336,761	$	2,336,761	$	3,168,910	$	3,168,910
Federal funds sold		6,875		6,875		2,850		2,850
Debt securities held for investment		7		7		13		13
Loans held for sale		3,852		3,852		6,232		6,232
Level 3 inputs:
Debt securities held for investment		1,185		1,185		2,370		2,370
Loans, net of allowance for credit losses		7,374,846		7,065,173		6,850,835		6,563,755
FINANCIAL LIABILITIES
Level 2 inputs:
Deposits		10,534,171		10,098,240		10,974,228		10,614,840
Short-term borrowings		3,976		3,976		300		300
Subordinated debt		86,086		76,771		86,044		82,385
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments				4,714				4,598
Letters of credit				589				542

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. Certain non-financial assets and non-financial liabilities measured at fair value on a nonrecurring basis include intangible assets and other non-financial long-lived assets measured at fair value and adjusted for impairment. These items are evaluated at least annually for impairment. The overall levels of non-financial assets and non-financial liabilities measured at fair value on a nonrecurring basis were not considered to be significant to the Company at September 30, 2023 or December 31, 2022.

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(11) 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. The Company had a margin asset included in other assets in the amount of $22.3 million at September 30, 2023 and $6.6 million at December 31, 2022.

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:

		September 30, 2023						December 31, 2022
Oil and Natural Gas Swaps and Options	Notional Units	Notional Amount			Estimated Fair Value			Notional Amount			Estimated Fair Value
		(Notional amounts and dollars in thousands)
Oil
Derivative assets	Barrels		4,041		$	12,352			2,698		$	8,868
Derivative liabilities	Barrels		(4,041	)		(11,204	)		(2,698	)		(8,259	)
Gas/Natural Gas Liquids
Derivative assets	MMBTUs/Gallons		54,266			9,334			25,059			11,877
Derivative liabilities	MMBTUs/Gallons		(54,266	)		(8,354	)		(25,059	)		(11,424	)
Total Fair Value	Included in
Derivative assets	Other assets					21,686						20,745
Derivative liabilities	Other liabilities					(19,558	)					(19,683	)

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Derivative income	$	115	$	118	$	464	$	406

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:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Credit exposure	$	—	$	6,560

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

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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.

(12) 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 Dallas and Fort Worth metropolitan areas. 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 Banks		BancFirst Community Banks		Pegasus		Worthington		Other Financial Services		Executive, Operations & Support			Eliminations			Consolidated
	(Dollars in thousands)
Three Months Ended September 30, 2023
Net interest income	$	30,258	$	56,644	$	11,334	$	4,160	$	1,063	$	849		$	—		$	104,308
Noninterest income		5,533		15,986		561		301		14,542		59,923			(52,397	)		44,449
Income before taxes		22,043		38,985		6,559		693		5,541		43,282			(51,873	)		65,230
Three Months Ended September 30, 2022
Net interest income	$	26,022	$	55,782	$	13,815	$	4,723	$	1,604	$	(999	)	$	—		$	100,947
Noninterest income		8,722		18,764		246		305		14,106		62,969			(55,781	)		49,331
Income before taxes		22,827		41,179		8,178		2,109		6,222		43,180			(55,358	)		68,337
Nine Months Ended September 30, 2023
Net interest income	$	90,266	$	171,946	$	39,994	$	12,907	$	3,063	$	1,214		$	—		$	319,390
Noninterest income		18,710		55,504		1,242		835		41,064		189,754			(166,858	)		140,251
Income before taxes		66,941		125,768		26,060		3,114		16,003		137,624			(165,969	)		209,541
Nine Months Ended September 30, 2022
Net interest income	$	67,592	$	149,965	$	31,399	$	10,160	$	6,596	$	(2,411	)	$	20		$	263,321
Noninterest income		23,999		53,761		730		724		37,842		158,299			(139,776	)		135,579
Income before taxes		56,140		108,980		15,677		3,930		16,910		104,729			(139,073	)		167,293
Total Assets:
September 30, 2023	$	3,533,334	$	6,929,256	$	1,308,938	$	574,929	$	62,118	$	1,212,338		$	(1,506,311	)	$	12,114,602
December 31, 2022		3,412,369		6,886,066		1,404,033		541,002		171,679		1,473,443			(1,500,729	)		12,387,863

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.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis of our financial condition as of September 30, 2023 and December 31, 2022 and results of operations for the three and nine months ended September 30, 2023 should be read in conjunction with our consolidated financial statements and notes to the consolidated financial statements for the year ended December 31, 2022, and the other information included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. Certain risks, uncertainties and other factors, including those set forth under "Risk Factors" in Part I, Item 1A of the 2022 Form 10-K, and "Item 1A, Risk Factors" in this Quarterly Report on Form 10-Q, may cause actual results to differ materially from the results discussed in the forward-looking statements appearing in this discussion and analysis.

FORWARD LOOKING STATEMENTS

The Company may make forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 with respect to earnings, credit quality, corporate objectives, interest rates and other financial and business matters. Forward-looking statements include estimates and give management’s current expectations or forecasts of future events. The Company cautions readers that these forward-looking statements are subject to numerous assumptions, risks and uncertainties, including economic conditions; the performance of financial markets and interest rates; legislative and regulatory actions and reforms; competition; as well as other factors, all of which change over time. Examples of forward-looking statements include, but are not limited to: (i) projections of revenues, expenses, income or loss, earnings or loss per share, the payment or nonpayment of dividends, capital structure and other financial items; (ii) statements of plans, objectives and expectations, including those relating to products or services; (iii) statements of future economic performance; and (iv) statements of assumptions underlying such statements. Words such as “believes”, “anticipates”, “expects”, “intends”, “targeted”, “continue”, “remain”, “will”, “should”, “may” and other similar expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements.

Forward-looking statements involve risks and uncertainties that may cause actual results to differ materially from those in such statements. Factors that could cause actual results to differ from those discussed in the forward-looking statements include, but are not limited to:

•The impact of the Durbin Amendment of the Dodd-Frank Act ("Durbin Amendment") on noninterest income beginning July 1, 2023.

•Potential impacts of the recent adverse developments in the banking industry driven by high-profile bank failures, including impacts on customer confidence, demand deposit outflows and the regulatory response thereto.

•Recent deterioration in the market for commercial office property could have an adverse effect on the value of the Company's other real estate owned as well as commercial office collateral for the Company's commercial real estate loans.

•Political pressures could further limit our ability to charge for NSF and overdraft fees.

•Rising interest rates.

•The increased time, effort and non-interest expense related to ongoing and increased regulations from the Federal Reserve, Federal Deposit Insurance Corporation, the Consumer Financial Protection Bureau and the Securities and Exchange Commission (requirements related to environmental, social and governance (ESG) issues and climate disclosure).

•Local, regional, national and international economic conditions and the impact they may have on the Company and its customers.

•Changes in the mix of loan geographies, sectors and types or the level of non-performing assets and charge-offs.

•Inflation, including wage inflation, energy prices, securities markets and monetary fluctuations.

•Impairment of the Company’s goodwill or other intangible assets.

•Changes in consumer spending, borrowing and savings habits.

•Changes in the financial performance and/or condition of the Company’s borrowers, including the impact of rising interest rates.

•Technological changes.

•The effect of changes in accounting policies and practices, as may be adopted by the regulatory agencies, as well as the Public Company Accounting Oversight Board, the Financial Accounting Standards Board and other accounting standard setters.

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•The Company’s success at managing the risks involved in the foregoing items.

SUMMARY

The Company’s net income for the third quarter of 2023 was $51.0 million, compared to $55.4 million for the third quarter of 2022. Diluted net income per common share was $1.52 and $1.65 for the third quarter of 2023 and 2022, respectively. The Company’s net interest income for the third quarter of 2023 increased to $104.3 million, compared to $100.9 million for the third quarter of 2022. Rising short-term interest rates and loan growth drove the increase. The net interest margin for the third quarter was 3.73%, compared to 3.48% a year ago. For the third quarter of 2023, the Company recorded a provision for credit losses of $2.3 million to account for loan growth, compared to $2.9 million for the third quarter of 2022.

Noninterest income for the third quarter of 2023 totaled $44.4 million, compared to $49.3 million for the third quarter of 2022. The decrease in noninterest income was attributable to the reduction of interchange fees of approximately $5.4 million related to the impact of the Durbin Amendment as the Company exceeded $10 billion in total assets at December 31, 2022. In addition, noninterest income for the third quarter of 2022 included $3.2 million of income from an equity interest received from a prior loan settlement. The equity interest was sold during the second quarter of 2023 at no gain.

Noninterest expense for the third quarter of 2023 increased to $81.2 million compared to $79.1 million for the third quarter of 2022. Higher noninterest expense was primarily related to an increase in salaries and employee benefits of $2.5 million.

The Company’s effective tax rate was 21.8% for the third quarter of 2023 compared to 19.0% for the third quarter of 2022. The Company adopted Accounting Standard Update ("ASU") 2023-02 on January 1, 2023, which increased income tax expenses. Exercises of stock options contributed to the lower effective tax rate in 2022.

At September 30, 2023, the Company’s total assets were $12.1 billion, a decrease of $273.3 million from December 31, 2022. Loans totaled $7.5 billion, an increase of $526.7 million from December 31, 2022. Liquidity remained strong with cash at $2.3 billion and a quarterly average loan to deposit ratio of 70.6% at September 30, 2023 compared to 62.3% at year-end 2022. Deposits totaled $10.5 billion, $440.1 million below December 31, 2022 as some large commercial deposits moved from demand accounts into the Company's off balance sheet sweep account product. Sweep accounts totaled $4.0 billion at September 30, 2023, up $285.3 million from December 31, 2022. The Company continues to fund itself with community-based deposits and does not use brokered or reciprocal deposits. The Company’s total stockholders’ equity at September 30, 2023 was $1.4 billion, an increase of $119.7 million above December 31, 2022.

At September 30, 2023, the Company’s nonaccrual loans were $16.7 million compared to $15.3 million at year-end 2022. Asset quality remained strong with nonaccrual loans representing 0.22% of total loans at both September 30, 2023 and December 31, 2022. The allowance for credit losses to total loans stood at 1.31% at September 30, 2023, compared to 1.33% at December 31, 2022. Net charge-offs were 0.02% of average loans for the third quarter of 2023 compared to 0.00% for the third quarter of 2022.

Competition for deposits has recently increased and available yields have similarly increased, causing non-interest bearing deposits to move to interest bearing deposits and off balance sheet sweep account products. Although the percent of cash and due from banks, interest-bearing deposits with banks and federal funds sold to total assets has decreased to 19.4% at September 30, 2023, compared to 25.6% at December 31, 2022, the Company is still highly liquid.

See Note (2) of the Notes to Consolidated Financial Statements for disclosure regarding the Company’s recent developments, including mergers and acquisitions.

FUTURE APPLICATION OF ACCOUNTING STANDARDS

See Note (1) of the Notes to the Consolidated Financial Statements for disclosures regarding recently issued accounting pronouncements since December 31, 2022, the date of its most recent annual report to stockholders.

SEGMENT INFORMATION

See Note (12) of the Notes to the Consolidated Financial Statements for disclosures regarding business segments.

RESULTS OF OPERATIONS

Average Balances, Income, Expenses and Rates

31

The following table presents, for the periods indicated, certain information related to the Company's consolidated average balance sheets, average yields on assets and average costs of liabilities. Such yields are derived by dividing income or expense by the average balance of the corresponding assets or liabilities. For these computations: (i) average balances are derived from daily averages, (ii) information is shown on a taxable-equivalent basis assuming a 21% tax rate, and (iii) nonaccrual loans are included in the average loan balances and any interest on such nonaccrual loans is recognized on a cash basis. Loan fees included in interest income were $6.0 million for the three months ended September 30, 2023 compared to $5.7 million for the three months ended September 30, 2022. Loan fees included in interest income were $17.3 million for the nine months ended September 30, 2023 compared to $19.4 million for the nine months ended September 30, 2022.

BANCFIRST CORPORATION
CONSOLIDATED AVERAGE BALANCE SHEETS AND INTEREST MARGIN ANALYSIS
(Unaudited)
Taxable Equivalent Basis
(Dollars in thousands)
	Three Months Ended September 30,
	2023								2022
				Interest		Average						Interest		Average
	Average			Income/		Yield/			Average			Income/		Yield/
	Balance			Expense		Rate			Balance			Expense		Rate
ASSETS
Earning assets:
Loans (1)	$	7,379,572		$	122,005		6.56	%	$	6,652,613		$	87,169		5.20	%
Debt securities – taxable		1,552,590			9,260		2.37			1,353,950			6,793		1.99
Debt securities – tax exempt		2,990			27		3.61			3,539			28		3.09
Federal funds sold and interest-bearing deposits with banks		2,162,655			29,052		5.33			3,512,242			20,119		2.27
Total earning assets		11,097,807			160,344		5.73			11,522,344			114,109		3.93
Nonearning assets:
Cash and due from banks		197,702								252,874
Interest receivable and other assets		813,824								892,858
Allowance for credit losses		(97,591	)							(86,955	)
Total nonearning assets		913,935								1,058,777
Total assets	$	12,011,742							$	12,581,121
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Transaction deposits	$	804,122		$	2,002		0.99	%	$	958,008		$	442		0.18	%
Savings deposits		4,646,598			46,292		3.95			4,313,076			10,447		0.96
Time deposits		816,779			6,544		3.18			678,549			1,110		0.65
Short-term borrowings		4,937			49		3.94			6,979			36		2.05
Subordinated debt		86,077			1,030		4.75			86,020			1,030		4.75
Total interest-bearing liabilities		6,358,513			55,917		3.49			6,042,632			13,065		0.86
Interest-free funds:
Noninterest-bearing deposits		4,183,422								5,208,591
Interest payable and other liabilities		114,867								118,375
Stockholders’ equity		1,354,940								1,211,523
Total interest free funds		5,653,229								6,538,489
Total liabilities and stockholders’ equity	$	12,011,742							$	12,581,121
Net interest income				$	104,427							$	101,044
Net interest spread							2.24	%							3.07	%
Effect of interest free funds							1.49	%							0.41	%
Net interest margin							3.73	%							3.48	%

32

BANCFIRST CORPORATION
CONSOLIDATED AVERAGE BALANCE SHEETS AND INTEREST MARGIN ANALYSIS
(Unaudited)
Taxable Equivalent Basis
(Dollars in thousands)
	Nine Months Ended September 30,
	2023								2022
				Interest		Average						Interest		Average
	Average			Income/		Yield/			Average			Income/		Yield/
	Balance			Expense		Rate			Balance			Expense		Rate
ASSETS
Earning assets:
Loans (1)	$	7,212,231		$	341,194		6.33	%	$	6,527,355		$	239,072		4.90	%
Debt securities – taxable		1,576,358			27,659		2.35			1,218,092			15,716		1.73
Debt securities – tax exempt		3,239			65		2.70			3,993			89		2.99
Federal funds sold and interest-bearing deposits with banks		2,362,174			87,879		4.97			3,582,533			29,482		1.10
Total earning assets		11,154,002			456,797		5.48			11,331,973			284,359		3.35
Nonearning assets:
Cash and due from banks		205,269								271,060
Interest receivable and other assets		810,025								874,379
Allowance for credit losses		(95,614	)							(86,545	)
Total nonearning assets		919,680								1,058,894
Total assets	$	12,073,682							$	12,390,867
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Transaction deposits	$	859,301		$	5,271		0.82	%	$	959,261		$	846		0.12	%
Savings deposits		4,510,005			114,450		3.39			4,271,070			14,320		0.45
Time deposits		756,962			14,026		2.48			666,190			2,400		0.48
Short-term borrowings		7,324			261		4.76			5,401			49		1.21
Subordinated debt		86,063			3,091		4.80			86,006			3,091		4.81
Total interest-bearing liabilities		6,219,655			137,099		2.95			5,987,928			20,706		0.46
Interest-free funds:
Noninterest-bearing deposits		4,432,349								5,106,094
Interest payable and other liabilities		101,574								104,299
Stockholders’ equity		1,320,104								1,192,546
Total interest free funds		5,854,027								6,402,939
Total liabilities and stockholders’ equity	$	12,073,682							$	12,390,867
Net interest income				$	319,698							$	263,653
Net interest spread							2.53	%							2.89	%
Effect of interest free funds							1.30	%							0.22	%
Net interest margin							3.83	%							3.11	%

33

Selected income statement data and other selected data for the comparable periods were as follows:

BANCFIRST CORPORATION

SELECTED CONSOLIDATED FINANCIAL DATA

(Unaudited)

(Dollars in thousands, except per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Income Statement Data
Net interest income	$	104,308		$	100,947		$	319,390		$	263,321
Provision for credit losses		2,312			2,863			7,458			6,300
Securities transactions		(361	)		966			(464	)		(2,949	)
Total noninterest income		44,449			49,331			140,251			135,579
Salaries and employee benefits		50,200			47,741			149,255			136,957
Total noninterest expense		81,215			79,078			242,642			225,307
Net income		50,988			55,352			163,531			135,974
Per Common Share Data
Net income – basic	$	1.55		$	1.69		$	4.97		$	4.15
Net income – diluted		1.52			1.65			4.88			4.07
Cash dividends		0.43			0.40			1.23			1.12
Performance Data
Return on average assets		1.68	%		1.75	%		1.81	%		1.47	%
Return on average stockholders’ equity		14.93			18.13			16.56			15.24
Cash dividend payout ratio		27.74			23.67			24.75			26.99
Net interest spread		2.24			3.07			2.53			2.89
Net interest margin		3.73			3.48			3.83			3.11
Efficiency ratio		54.60			52.62			52.79			56.48
Net loan charge-offs
Net loan charge-offs to average loans		0.02			0.00			0.03			0.01

Net Interest Income

For the three months ended September 30, 2023, net interest income, which is the Company’s principal source of operating revenue, increased $3.4 million or 3.3% compared to the three months ended September 30, 2022. The increase was due to rising short-term interest rates and loan growth. Net interest margin is the ratio of taxable-equivalent net interest income to average earning assets for the period. As shown in the preceding table, the Company’s net interest margin for the third quarter of 2023 increased compared to the third quarter of 2022.

Net interest income for the nine months ended September 30, 2023 increased $56.1 million or 21.3% compared to the nine months ended September 30, 2022. Rising short term interest rates and loan growth contributed to the increase. As shown in the preceding table, the Company’s net interest margin for the nine months ended September 30, 2023 increased compared to the nine months ended September 30, 2022.

In March of 2022, the Federal Reserve began raising the federal funds rate in an effort to reduce inflation and slow the economy. The Company’s net interest income and net interest margin were impacted by the increases in interest rates.

Provision for Credit Losses

The provision for credit losses is presented in the preceding table. The Company establishes an allowance as an estimate of the expected credit losses in the loan portfolio at the balance sheet date. Management believes the allowance for credit losses is appropriate based upon management’s best estimate of expected losses within the existing loan portfolio. Should any of the factors considered by management in evaluating the appropriate level of the allowance for credit losses change, the Company’s estimate of expected credit losses could also change, which could affect the amount of future provisions for credit losses. Net loan charge-offs were $1.5 million for the third quarter of 2023, compared to net loan charge-offs of $80,000 for the third quarter of 2022. The rate of net charge-offs to average loans, as presented in the preceding table, continues to be at a low level.

The increased provision for credit losses for the nine months ended September 30, 2023 compared to the nine months ended September 30, 2022 was due to loan growth. Net loan charge-offs were $2.4 million for the nine months ended September 30, 2023, compared to $436,000 for the same period of the prior year.

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Noninterest Income

Noninterest income, as presented in the preceding table, decreased by $4.9 million for the third quarter of 2023 compared to the third quarter of 2022. The decrease in noninterest income was attributable to the reduction of interchange fees of approximately $5.4 million related to the impact of the Durbin Amendment as the Company exceeded $10 billion in total assets at December 31, 2022. Sweep account fees increased $2.4 million for the third quarter of 2023 compared to the third quarter of 2022 due to higher sweep account balances. Noninterest income for the third quarter of 2022 included $3.2 million in income from an equity interest received from a prior loan settlement, which was sold during the second quarter of 2023 at no gain.

Noninterest income included non-sufficient funds ("NSF") and overdraft fees totaling $7.4 million and $6.7 million for the three months ended September 30, 2023 and 2022, respectively. This represents 16.7% and 13.6% of the Company’s noninterest income for the respective periods. In addition, the Company had debit card interchange fees totaling $6.6 million and $12.6 million during the three months ended September 30, 2023 and 2022, respectively. This represents 14.9% and 25.5% of the Company’s noninterest income for the respective periods. The decrease in debit card interchange fees was due to the aforementioned impact of the Durbin Amendment.

Noninterest income grew by $4.7 million for the nine months ended September 30, 2023 compared to the nine months ended September 30, 2022. The growth in noninterest income was mostly attributable to an increase in sweep account fees of $10.7 million due to increased sweep account balances, along with an increase in trust revenue and insurance commissions. In addition, the first nine months of 2022 included a loss of $4.0 million on the sale of $226 million of low yielding debt securities, which were subsequently reinvested at higher yielding debt securities. Noninterest income for the nine months ended September 30, 2022 included $8.8 million of income from an equity interest received from a prior loan settlement compared to $327,000 for nine months ended September 30, 2023. The equity interest was sold during the second quarter of 2023 at no gain. The Company earned $2.1 million on the sale of loans for the nine months ended September 30, 2023 compared to $3.9 million for the nine months ended September 30, 2022.

Noninterest income included non-sufficient fund fees totaling $20.5 million and $19.4 million during the nine months ended September 30, 2023 and 2022, respectively. This represents 14.6% and 14.3% of the Company’s noninterest income for the respective periods. In addition, the Company had debit card interchange fees totaling $31.0 million and $36.7 million during the nine months ended September 30, 2023 and 2022, respectively. This represents 22.1% and 27.1% of the Company’s noninterest income for the respective periods. The decrease in debit card interchange fees was due to the aforementioned impact of the Durbin Amendment.

The Company is subject to political pressures that could limit our ability to charge for NSF and overdraft fees. As of April 1, 2022, the Company lowered the rates charged on NSF and overdraft fees. The Company exceeded $10 billion in total assets at December 31, 2022. Pursuant to the Durbin Amendment of the Dodd-Frank Act, which took effect on July 1, 2023, based on current run rates, annual pretax income from debit card interchange fees would be reduced by approximately $23 million.

Noninterest Expense

Noninterest expense, as presented in the preceding table, increased by $2.1 million for third quarter of 2023 compared to the third quarter of 2022. Higher noninterest expenses in 2023 was primarily related to growth in salaries and employee benefits of $2.5 million.

For the nine months ended September 30, 2023, noninterest expense increased by $17.3 million compared to the nine months ended September 30, 2022. Higher noninterest expenses in 2023 was primarily related to growth in salaries and employee benefits of $12.3 million. In addition, noninterest expense was lower in the nine months ended September 30, 2022 due to a gain from the sale of the Company’s prior headquarters that was carried in other real estate owned which reduced noninterest expense by $3.1 million. The nine months ended September 30, 2022 also included a write down of an equity investment of $1.5 million.

Income Taxes

The Company’s effective tax rate was 21.8% for the third quarter of 2023, compared to 19.0% for the third quarter of 2022. The Company's adoption of ASU 2023-02 in the first quarter of 2023 increased income tax expense due to the amortization of $1.3 million of New Markets Tax Credits ("NMTC") to income tax expense during the period that would have previously been recorded to other expense, which increased the effective tax rate by 1.99%. The lower effective tax rate in 2022 was also driven by the exercising of stock options during the quarter.

The Company’s effective tax rate was 22.0% for the first nine months of 2023, compared to 18.7% for the first nine months of 2022. The Company's adoption of ASU 2023-02 in the first quarter of 2023 increased income tax expense due to the amortization of $3.5 million of NMTC to income tax expense during the period that would have previously been recorded to other expense, which increased the effective tax rate by 1.65%. Exercises of stock options contributed to the lower effective tax rate in 2022.

The primary reasons for the difference between the Company’s effective tax rate and the federal statutory rate were tax-exempt income, nondeductible amortization, federal and state tax credits and state tax expense.

35

FINANCIAL POSITION

BANCFIRST CORPORATION
SELECTED CONSOLIDATED FINANCIAL DATA
(Dollars in thousands, except per share data)
	September 30, 2023			December 31, 2022
	(unaudited)
Balance Sheet Data
Total assets	$	12,114,602		$	12,387,863
Total loans (net of unearned interest)		7,476,474			6,949,795
Allowance for credit losses		97,776			92,728
Debt securities		1,525,448			1,540,604
Deposits		10,534,171			10,974,228
Stockholders' equity		1,370,584			1,250,836
Book value per share		41.63			38.05
Tangible book value per share (non-GAAP)(1)		35.56			31.90
Reconciliation of Tangible Book Value per Common Share (non-GAAP)(2)
Stockholders' equity	$	1,370,584		$	1,250,836
Less goodwill		182,263			182,055
Less intangible assets, net		17,591			19,983
Tangible stockholders' equity (non-GAAP)	$	1,170,730		$	1,048,798
Common shares outstanding		32,921,393			32,875,560
Tangible book value per share (non-GAAP)	$	35.56		$	31.90
Selected Financial Ratios
Balance Sheet Ratios:
Average loans to deposits (year-to-date)		68.31	%		60.06	%
Average earning assets to total assets (year-to-date)		92.38			91.63
Average stockholders’ equity to average assets (year-to-date)		10.93			9.67
Asset Quality Data
Loans past due 90 days and still accruing	$	12,575		$	7,085
Nonaccrual loans (3)		16,676			15,299
Other real estate owned and repossessed assets		42,782			36,936
Asset Quality Ratios:
Nonaccrual loans to total loans		0.22	%		0.22	%
Allowance for credit losses to total loans		1.31			1.33
Allowance for credit losses to nonaccrual loans		586.34			606.10
(1) Refer to the “Reconciliation of Tangible Book Value per Common Share (non-GAAP)” Table.
(2) Tangible book value per common share is stockholders’ equity less goodwill and intangible assets, net, divided by common shares outstanding. This amount is a non-GAAP financial measure but has been included as it is considered to be a critical metric with which to analyze and evaluate the financial condition and capital strength of the Company. This measure should not be considered a substitute for operating results determined in accordance with GAAP.
(3) Government agencies guarantee approximately $5.7 million of nonaccrual loans at September 30, 2023.

Cash and Due from Banks, Federal Funds Sold and Interest-Bearing Deposits with Banks

The aggregate of cash and due from banks, federal funds sold and interest-bearing deposits with banks decreased by $828.1 million or 26.1% to $2.3 billion, from December 31, 2022 to September 30, 2023. The decrease was primarily due to the movement of some large commercial deposits into the Company's off-balance sheet sweep account product and loan growth. Sweep accounts were $4.0 billion at September 30, 2023, up $285.3 million from December 31, 2022.

Securities

At September 30, 2023, total debt securities decreased $15.2 million, or 1.0% compared to December 31, 2022. The size of the Company’s securities portfolio is determined by the Company’s liquidity and asset/liability management. The net unrealized loss on debt securities available for sale, before taxes, was $101.0 million at September 30, 2023, compared to a net unrealized loss of $93.7 million at December 31, 2022. These unrealized losses are included in the Company’s stockholders’ equity as accumulated other

36

comprehensive income, net of income tax, in the amounts of a loss of $77.2 million at September 30, 2023 and a loss of $71.6 million at December 31, 2022. During the nine months ended September 30, 2023, the Company purchased debt securities as shown in the consolidated statements of cash flow. The Company did not have any sales of debt securities during the nine months ended September 30, 2023. During the nine months ended September 30, 2022, the Company had a loss of $4.0 million on bonds resulting from the sale of $226 million of debt securities with an average yield of 0.16%, the proceeds of which were subsequently reinvested in $220 million of debt securities with an average yield of 1.86%. The Company also made two other purchases of debt securities in 2022. On January 10, 2022, the Company purchased United States Treasury Notes with $600 million par value at an average yield of 1.42% and an average maturity of 53 months. On August 25, 2022, the Company purchased United States Treasury Notes of $300 million par value with an average yield of 3.27% and an average maturity of 58 months.

See Note (3) of the Notes to Consolidated Financial Statements for disclosures regarding the Company’s Securities.

Loans

At September 30, 2023, total loans increased $526.7 million or 7.6% compared to December 31, 2022, as a result of internal loan growth. Of the total increase in loans, oil and gas loans made up the largest increase with $109.6 million, or 20.8% of the increase, and construction and development loans increasing $100.4 million, or 19.1%. At September 30, 2023, oil and gas loans comprise 7.7% of loans compared to 6.7% at December 31, 2022. The increase of internal loan growth was 79% from the Company's Oklahoma subsidiary BancFirst and 21% from the Company's Texas subsidiaries Pegasus and Worthington.

See Note (4) of the Notes to Consolidated Financial Statements for disclosures regarding the Company’s loan portfolio segments.

Allowance for Credit Losses

The allowance for credit losses to total loans was 1.31% at September 30, 2023, compared to 1.33% at December 31, 2022. The overall credit quality of the Company's loan portfolio has remained strong. If unforeseen adverse changes occur in the national or local economy, or in the credit markets, it would be reasonable to expect that the allowance for credit losses would increase in future periods.

Nonaccrual Loans

Nonaccrual loans totaled $16.7 million at September 30, 2023, compared to $15.3 million at December 31, 2022. The Company’s nonaccrual loans are primarily commercial real estate and commercial non-real estate loans. Nonaccrual loans negatively impact the Company’s net interest margin. A loan is placed on nonaccrual status when, in the opinion of management, the future collectability of both interest and principal is in serious doubt. Interest income is not recognized until the principal balance is fully collected. However, if the full collection of the remaining principal balance is not in doubt, interest income is recognized on certain of these loans on a cash basis. Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $1.1 million for the nine months ended September 30, 2023 and $992,000 for the nine months ended September 30, 2022. Only a small amount of this interest is expected to be ultimately collected. Approximately $5.7 million of nonaccrual loans were guaranteed by government agencies at September 30, 2023.

The classification of a loan as nonaccrual does not necessarily indicate that loan principal and interest will ultimately be uncollectible; although, in an economic downturn, the Company’s experience has been that the level of collections declines. The above normal risk associated with nonaccrual loans has been considered in the determination of the allowance for credit losses. The level of nonaccrual loans and credit losses could rise over time as a result of adverse economic conditions. The allowance for credit losses as a percentage of nonaccrual loans is shown in the table above.

Modified Loans

As of January 1, 2023, the Company adopted ASU No. 2022-02, which eliminates the Troubled Debt Restructurings (“TDR”) recognition and measurement guidance and, instead, requires that the Company evaluate, based on the accounting for loan modifications, whether the modification represents a new loan or a continuation of an existing loan when a borrower is experiencing financial difficulty. 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 modified loans was approximately $8.4 million during the period ended September 30, 2023.

Other Real Estate Owned and Repossessed Assets

Other real estate owned (OREO) and repossessed assets totaled $42.8 million at September 30, 2023, compared to $36.9 million at December 31, 2022. The Company has spent $4.2 million on OREO tenant improvement during the nine months ended September 30, 2023, which is the contributing factor to the increase. OREO consists of properties acquired through foreclosure proceedings or acceptance of a deed in lieu of foreclosure and premises held for sale. These properties are carried at the lower of the book values of the related loans or fair values based upon appraisals, less estimated costs to sell. Write-downs arising at the time of reclassification of such

37

properties from loans to OREO are charged directly to the allowance for credit losses. Any losses on bank premises designated to be sold are charged to operating expense at the time of transfer from premises to OREO. Decreases in values of properties subsequent to their classification as OREO are charged to operating expense.

OREO included a commercial real estate property recorded at $32.7 million at September 30, 2023 and $29.4 million at December 31, 2022. 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 OREO in other 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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)
Rental income	$	2,911	$	2,437	$	8,379	$	7,750
Operating expense		2,690		2,381		8,038		7,120

The Company's total rental income and operating expenses from OREO are presented in the following table:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)
Rental income	$	3,030	$	2,546	$	8,746	$	8,148
Operating expense		2,831		2,528		8,445		7,606

Intangible Assets, Goodwill and Other Assets

Identifiable intangible assets and goodwill totaled $199.9 million and $202.0 million at September 30, 2023 and December 31, 2022, respectively.

Other assets includes the cash surrender value of key-man life insurance policies totaling $84.0 million at September 30, 2023 and $82.7 million at December 31, 2022.

Derivative financial instruments consisting of oil and gas swaps and option contracts are included in other assets and totaled $21.7 million at September 30, 2023 and $20.7 million at December 31, 2022. These derivative financial instruments have increased due to the increase in oil and gas prices and customer activity. They require a daily margin to be posted, which fluctuates with oil and gas prices and customer activity. The Company had a margin asset included in other assets in the amount of $22.3 million at September 30, 2023 and $6.6 million at December 31, 2022. See Note (11) of the Notes to Consolidated Financial Statements for a complete discussion of the Company’s derivative financial instruments.

Equity securities are reported in other assets on the consolidated balance sheet. The Company invests in equity securities without readily determinable fair values. 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. The balance of equity securities was $14.8 million at September 30, 2023 and $15.5 million at December 31, 2022. The Company reviews its portfolio of equity securities for impairment at least quarterly.

The balance of other assets included equity interests of previous borrowers in the oil and gas industry that were received through bankruptcy proceedings, which totaled $21.4 million at December 31, 2022. This equity interest was sold during the second quarter of 2023 resulting in a zero balance at September 30, 2023. Under the equity method, the carrying value of a bank’s investment in an investee is originally recorded at cost but is adjusted periodically to record as income the bank’s proportionate share of the investee’s earnings or losses and decreased by the amount of cash dividends or similar distributions received from the investee.

Low Income Housing and New Market Tax Credit Investments

During 2023, there have not been any material changes in the Company’s low income housing tax credit ("LIHTC") investments and NMTC investments, which are included in other assets on the Company’s consolidated balance sheet. The Company adopted ASU 2023-02 on January 1, 2023 and as of September 30, 2023 have recorded $26.1 million in other assets and other liabilities on the

38

consolidated balance sheet for unfunded LIHTC commitments. See Note (6) of the Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022, for disclosures regarding these investments.

Liquidity and Funding

The Company’s principal source of liquidity and funding is its broad deposit base generated from customer relationships. The availability of deposits is affected by economic conditions, competition with other financial institutions and alternative investments available to customers. Through interest rates paid, service charge levels and services offered, the Company can affect its level of deposits to a limited extent. The level and maturity of funding necessary to support the Company’s lending and investment functions is determined through the Company’s asset/liability management process. The Company currently does not rely heavily on long-term borrowings and does not utilize brokered CDs. The Company maintains lines of credit from the Federal Home Loan Bank (“FHLB”), federal funds lines of credit with other banks and could also utilize the sale of loans, securities and liquidation of other assets as sources of liquidity and funding. Although the percent of cash and due from banks, interest-bearing deposits with banks and federal funds sold to total assets has decreased to 19.4% at September, 30. 2023, compared to 25.6% at December 31, 2022, the Company is still highly liquid. The decrease was primarily due to the movement of some large commercial deposits into the Company's off-balance sheet sweep account product and loan growth.

There have not been any other material changes from the liquidity and funding discussion included in Management’s Discussion and Analysis in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

Deposits

At September 30, 2023, deposits totaled $10.5 billion, a decrease of $440.1 million from December 31, 2022 as some large commercial deposits moved into the Company's off balance sheet sweep account product. The Company’s core deposits provide it with a stable, low-cost funding source. The Company’s core deposits as a percentage of total deposits were 97.3% at September 30, 2023 and 98.1% at December 31, 2022. Noninterest-bearing deposits to total deposits were 39.6% at September 30, 2023, compared to 45.1% at December 31, 2022. Competition for deposits has recently increased and available yields have similarly increased, causing non-interest bearing deposits to move to interest bearing deposits and off balance sheet sweep account products.

Off-balance sheet sweep accounts totaled $4.0 billion at September 30, 2023 compared to $3.7 billion at December 31, 2022. The Company's sweep accounts affected the balances of both cash and deposits.

Subordinated Debt

See Note (6) of the Notes to Consolidated Financial Statements for a complete discussion of the Company’s subordinated debt.

Short-Term Borrowings and Lines of Credit

Short-term borrowings, consisting primarily of federal funds purchased and repurchase agreements, are another source of funds for the Company. The level of these borrowings is determined by various factors, including customer demand and the Company’s ability to earn a favorable spread on the funds obtained. Short-term borrowings were $4.0 million at September 30, 2023, compared to $300,000 at December 31, 2022. The Company has several lines of credit it can use. At September 30, 2023, BancFirst had $793.2 million available on its line of credit from the FHLB of Topeka, Kansas and a $25.0 million line of credit with another financial institution that is an overnight federal funds facility. Worthington has a $10.5 million line of credit with another financial institution that is an overnight federal funds facility, a Federal Reserve discount window capacity of $27.5 million and a $76.4 million line of credit from the FHLB of Dallas, Texas.

Capital Resources

Stockholders’ equity totaled $1.4 billion at September 30, 2023, an increase of $119.7 million above December 31, 2022. In addition to net income of $163.5 million, other changes in stockholders’ equity during the nine months ended September 30, 2023 included $2.1 million related to common stock issuances for stock option exercises and $2.1 million related to stock-based compensation that were partially offset by $40.5 million in dividends, $1.8 million in the repurchase of company stock and a $5.6 million decrease in accumulated other comprehensive income. The Company’s leverage ratio and total risk-based capital ratios at September 30, 2023, were well in excess of the regulatory requirements.

See Note (8) of the Notes to Consolidated Financial Statements for a discussion of capital ratios and requirements.

Liquidity Risk and Off-Balance Sheet Arrangements

Other than changes in the Company's liquidity elsewhere disclosed in this discussion, there have not been any material changes in the Company’s liquidity risk and off-balance sheet arrangements included in Management’s Discussion and Analysis which was included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

39

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

There have been no significant changes in the Company’s disclosures regarding market risk since December 31, 2022, the date of its most recent annual report to stockholders.

Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures. Pursuant to Rule 13a-15 of the Securities Exchange Act of 1934 (the “Exchange Act”), the Company’s Chief Executive Officer, Chief Financial Officer and its Disclosure Committee, which includes the Company’s Executive Chairman, Chief Risk Officer, Chief Internal Auditor, Chief Asset Quality Officer, Controller, General Counsel and Director of Financial Reporting, have evaluated, as of the last day of the period covered by this report, the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act). Based on their evaluation they concluded that the disclosure controls and procedures of the Company are effective to ensure that information required to be disclosed by the Company in the reports filed or submitted by it under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported, within the time periods specified in the applicable rules and forms.

Changes in Internal Control Over Financial Reporting. During the period to which this report relates, there have not been any changes in the Company’s internal controls over financial reporting (as defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act) that have materially affected, or are reasonably likely to materially affect, such controls.

40

PART II – OTHER INFORMATION

Item 1. Legal Proceedings.

The Company has been named as a defendant in various legal actions arising from the conduct of its normal business activities. Although the amount of any liability that could arise with respect to these actions cannot be accurately predicted, in the opinion of the Company, any such liability will not have a material adverse effect on the consolidated financial statements of the Company.

Item 1A. Risk Factors.

The following represents a material change in our risk factors from those disclosed in Part I – “Item 1A. Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

Recent negative developments in the banking industry could adversely affect our financial condition and results of operations.

The recent bank failures and related negative media attention have generated significant market trading volatility among publicly traded bank holding companies and, in particular, regional, as well as community banks like the Company. These developments have negatively impacted customer confidence in regional and community banks that are not considered too big to fail, which has prompted customers to move uninsured deposits to banks that are perceived as too big to fail. Further, competition for deposits has recently increased and available yields have similarly increased, causing non-interest bearing deposits to move to interest bearing deposits and sweeps. If such movement is permanent, it will reduce our net interest margin going forward. The financial impact on the Company of ongoing market volatility, continued inflation and rising interest rates will depend on future developments which are highly uncertain and difficult to predict.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

The following table provides information with respect to purchases made by or on behalf of the Company or any “affiliated purchaser” (as defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934), of the Company’s common stock during the three months ended September 30, 2023.

								Maximum
						(1	)	Number of Shares
					Total Number of			That May Yet Be
					Shares Purchased			Purchased Under
	Total Number of		Average Price		as Part of Publicly			the Plan at the
Period	Shares Purchased		Paid Per Share		Announced Plan			End of the Period
July 1, 2023 to July 31, 2023		—	$	—		—			500,486
August 1, 2023 to August 31, 2023		—		—		—			500,486
September 1, 2023 to September 30, 2023		20,702		87.88		20,702			479,784

(1) In November 1999, the Company adopted the Stock Repurchase Program (the “SRP”), 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. The timing, price and amount of stock repurchases under the SRP are determined by management and subject to approval by the Company’s Executive Committee.

Item 3. Defaults Upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

None.

Item 5. Other Information.

None.

41

Item 6. Exhibits.

Exhibit Number	Exhibit
3.1	Amended and Restated By-Laws of BancFirst Corporation (filed as Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q for the Quarter Ended March 31, 2023 and incorporated herein by reference).
3.2	Restated Certificate of Incorporation of BancFirst Corporation dated August 5, 2021 (filed as Exhibit 3.2 to the Company's Quarterly Report on Form 10-Q for the Quarter Ended June 30, 2021 and incorporated herein by reference).
10.1	BancFirst Corporation 2023 Restricted Stock Unit Plan (filed as Exhibit 10.1 to the Company's Current Report on Form 8-K dated May 25, 2023 and incorporated herein by reference).
31.1*	Chief Executive Officer’s Certification pursuant to Rule 13a-14(a) or Rule 15d-14(a).
31.2*	Chief Financial Officer’s Certification pursuant to Rule 13a-14(a) or Rule 15d-14(a).
32**	CEO’s & CFO’s Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	Inline XBRL Instance Document - The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH*	Inline XBRL Taxonomy Extension Schema Document.
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB*	Inline XBRL Taxonomy Extension Label Linkbase Document.
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase Document.
104*	Cover page Interactive Data File (formatted as Inline XBRL and contained within the Inline XBRL Instance Document in Exhibit 101)

* Filed herewith.

** This exhibit is furnished herewith and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be deemed to be incorporated by reference into any filing under the Securities Act or the Exchange Act.

42

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	BANCFIRST CORPORATION
	(Registrant)
Date: November 6, 2023	/s/ David Harlow
	David Harlow
	President
	Chief Executive Officer
	(Principal Executive Officer)
Date: November 6, 2023	/s/ Kevin Lawrence
	Kevin Lawrence
	Executive Vice President
	Chief Financial Officer
	(Principal Financial Officer)

43

EX-31.1

Exhibit 31.1

CEO’S CERTIFICATION PURSUANT TO RULE 13a-14(a) OR RULE 15d-14(a)

I, David Harlow, certify that:

1.I have reviewed this quarterly report on Form 10-Q of BancFirst Corporation;

2.Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;

3.Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a – 15 (e) and 15d – 15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a – 15(f) and 15d – 15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this quarterly report based on such evaluation; and

d) Disclosed in this quarterly report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

Date: November 6, 2023	/s/ David Harlow
	David Harlow
	President and Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CFO’S CERTIFICATION PURSUANT TO RULE 13a-14(a) OR RULE 15d-14(a)

I, Kevin Lawrence, certify that:

1.I have reviewed this quarterly report on Form 10-Q of BancFirst Corporation;

2.Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;

3.Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a – 15 (e) and 15d – 15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a – 15(f) and 15d – 15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this quarterly report based on such evaluation; and

d) Disclosed in this quarterly report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

Date: November 6, 2023	/s/ Kevin Lawrence
	Kevin Lawrence
	Executive Vice President
	Chief Financial Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

Certification of periodic report

pursuant to section 906 of the sarbanes-oxley act of 2002

I, David Harlow, Chief Executive Officer and Kevin Lawrence, Chief Financial Officer of BancFirst Corporation (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

(1)The Quarterly Report on Form 10-Q of the Company for the period ended September 30, 2023 (the “Form 10-Q”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2)The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 6, 2023

/s/ David Harlow

David Harlow

President and Chief Executive Officer

(Principal Executive Officer)

/s/ Kevin Lawrence

Kevin Lawrence

Executive Vice President

and Chief Financial Officer

(Principal Financial Officer)

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
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		32,921,393

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks	$ 202,680	$ 259,049
Interest-bearing deposits with banks	2,134,081	2,909,861
Federal funds sold	6,875	2,850
Debt securities held for investment (fair value: $1,192 and $2,383, respectively)	1,192	2,383
Debt securities available for sale at fair value	1,524,256	1,538,221
Loans held for sale	3,852	6,232
Loans held for investment (net of unearned interest)	7,472,622	6,943,563
Allowance for credit losses	(97,776)	(92,728)
Loans, net of allowance for credit losses	7,374,846	6,850,835
Premises and equipment, net	279,607	278,088
Other real estate owned	42,390	36,756
Intangible assets, net	17,591	19,983
Goodwill	182,263	182,055
Accrued interest receivable and other assets	344,969	301,550
Total assets	12,114,602	12,387,863
Deposits:
Noninterest-bearing	4,170,550	4,944,730
Interest-bearing	6,363,621	6,029,498
Total deposits	10,534,171	10,974,228
Short-term borrowings	3,976	300
Accrued interest payable and other liabilities	119,785	76,455
Subordinated debt	86,086	86,044
Total liabilities	10,744,018	11,137,027
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,921,393 and 32,875,560, respectively	32,921	32,876
Capital surplus	173,308	169,231
Retained earnings	1,241,532	1,120,292
Accumulated other comprehensive loss, net of tax benefit of $23,872 and $22,107, respectively	(77,177)	(71,563)
Total stockholders' equity	1,370,584	1,250,836
Total liabilities and stockholders' equity	$ 12,114,602	$ 12,387,863

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities, fair value	$ 1,192	$ 2,383
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	32,921,393	32,875,560
Common stock, shares outstanding	32,921,393	32,875,560
Accumulated other comprehensive loss, net of tax benefit	$ 23,872	$ 22,107
Senior Preferred Stock [Member]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Cumulative Preferred Stock [Member]
Preferred stock, par value	$ 5.00	$ 5.00
Preferred stock, shares authorized	900,000	900,000
Preferred stock, shares issued	0	0

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
INTEREST INCOME
Loans, including fees	$ 121,891	$ 87,078	$ 340,899	$ 238,758
Debt securities:
Taxable	9,260	6,793	27,659	15,716
Tax-exempt	22	22	52	71
Federal funds sold	63	24	176	30
Interest-bearing deposits with banks	28,989	20,095	87,703	29,452
Total interest income	160,225	114,012	456,489	284,027
INTEREST EXPENSE
Deposits	54,838	11,999	133,747	17,566
Short-term borrowings	49	36	261	49
Subordinated debt	1,030	1,030	3,091	3,091
Total interest expense	55,917	13,065	137,099	20,706
Net interest income	104,308	100,947	319,390	263,321
Provision for credit losses	2,312	2,863	7,458	6,300
Net interest income after provision for credit losses	101,996	98,084	311,932	257,021
NONINTEREST INCOME
Securities transactions (includes accumulated other comprehensive loss reclassifications of $0 and $1,536, respectively)	(361)	966	(464)	(2,949)
Income from sales of loans	734	969	2,095	3,891
Insurance commissions	8,429	7,498	23,395	20,227
Cash management	8,177	5,624	22,838	13,202
Gain on sale of other assets	464	53	1,258	216
Other	5,113	7,935	16,925	24,258
Total noninterest income	44,449	49,331	140,251	135,579
NONINTEREST EXPENSE
Salaries and employee benefits	50,200	47,741	149,255	136,957
Occupancy, net	5,487	4,930	15,588	14,067
Depreciation	4,685	4,612	14,097	14,034
Amortization of intangible assets	885	880	2,645	2,568
Data processing services	1,820	1,876	6,144	5,656
Net expense from other real estate owned	2,720	2,392	8,068	3,676
Marketing and business promotion	2,034	1,945	6,461	5,609
Deposit insurance	1,419	1,202	4,495	3,526
Other	11,965	13,500	35,889	39,214
Total noninterest expense	81,215	79,078	242,642	225,307
Income before taxes	65,230	68,337	209,541	167,293
Income tax expense	14,242	12,985	46,010	31,319
Net income	$ 50,988	$ 55,352	$ 163,531	$ 135,974
NET INCOME PER COMMON SHARE
Basic	$ 1.55	$ 1.69	$ 4.97	$ 4.15
Diluted	$ 1.52	$ 1.65	$ 4.88	$ 4.07
OTHER COMPREHENSIVE (LOSS)/GAIN
Unrealized loss on debt securities, net of tax benefit of $1,919, $11,033, $1,765 and $26,492, respectively	$ (6,172)	$ (35,752)	$ (5,614)	$ (85,557)
Reclassification adjustment for loss included in net income, net of tax expense of $0, $0, $0 and $369, respectively				1,167
Other comprehensive loss, net of tax benefit of $1,919, $11,033, $1,765 and $26,123, respectively	(6,172)	(35,752)	(5,614)	(84,390)
Comprehensive income	44,816	19,600	157,917	51,584
Trust Revenue [Member]
NONINTEREST INCOME
Revenue	4,866	4,125	13,678	11,580
Service Charges on Deposits [Member]
NONINTEREST INCOME
Revenue	$ 17,027	$ 22,161	$ 60,526	$ 65,154

XML

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Securities transactions accumulated other comprehensive loss reclassifications	$ 0	$ 0	$ 0	$ 1,536
Unrealized losses on debt securities, tax	(1,919)	(11,033)	(1,765)	(26,492)
Reclassification adjustment for losses included in net income, tax	0	0	0	369
Other comprehensive loss, tax	$ (1,919)	$ (11,033)	$ (1,765)	$ (26,123)

XML

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	COMMON STOCK [Member]	CAPITAL SURPLUS [Member]	RETAINED EARNINGS [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
Balance at beginning of period at Dec. 31, 2021		$ 32,603	$ 159,914	$ 977,067	$ 2,150
Shares issued for stock options		253	6,758
Net income	$ 135,974			135,974
Dividends on common stock				(36,725)
Stock-based compensation arrangements			1,545
Net change					(84,390)
Balance at end of period at Sep. 30, 2022	1,195,149	32,856	168,217	1,076,316	(82,240)
Balance at beginning of period at Jun. 30, 2022		32,781	165,295	1,034,107	(46,488)
Shares issued for stock options		75	2,295
Net income	55,352			55,352
Dividends on common stock				(13,143)
Stock-based compensation arrangements			627
Net change					(35,752)
Balance at end of period at Sep. 30, 2022	1,195,149	32,856	168,217	1,076,316	(82,240)
Balance at beginning of period at Dec. 31, 2022	1,250,836	32,876	169,231	1,120,292	(71,563)
Shares issued for stock options		66	2,000
Net income	163,531			163,531
Dividends on common stock				(40,492)
Shares acquired and canceled		(21)		(1,799)
Stock-based compensation arrangements			2,077
Net change					(5,614)
Balance at end of period at Sep. 30, 2023	1,370,584	32,921	173,308	1,241,532	(77,177)
Balance at beginning of period at Jun. 30, 2023		32,939	172,358	1,206,499	(71,005)
Shares issued for stock options		3	86
Net income	50,988			50,988
Dividends on common stock				(14,156)
Shares acquired and canceled		(21)		(1,799)
Stock-based compensation arrangements			864
Net change					(6,172)
Balance at end of period at Sep. 30, 2023	$ 1,370,584	$ 32,921	$ 173,308	$ 1,241,532	$ (77,177)

XML

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
RETAINED EARNINGS [Member]
Dividend on common stock	$ 0.43	$ 0.40	$ 1.23	$ 1.12

XML

Consolidated Statements of Cash Flow (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 163,531,000	$ 135,974,000
Adjustments to reconcile to net cash provided by operating activities:
Provision for credit losses	7,458,000	6,300,000
Depreciation and amortization	16,742,000	16,602,000
Net amortization of securities premiums and discounts	(883,000)	3,002,000
Realized securities losses	464,000	2,949,000
Gain on sales of loans	(2,095,000)	(3,891,000)
Cash receipts from the sale of loans originated for sale	118,786,000	207,972,000
Cash disbursements for loans originated for sale	(114,312,000)	(184,129,000)
Deferred income tax benefit	(2,038,000)	(2,940,000)
Gain on sale of other assets	(1,635,000)	(4,185,000)
Increase in interest receivable	(8,519,000)	(11,703,000)
Increase in interest payable	5,235,000	528,000
Amortization of stock-based compensation arrangements	2,077,000	1,545,000
Excess tax benefit from stock-based compensation arrangements	(775,000)	(3,058,000)
Other, net	6,245,000	14,326,000
Net cash provided by operating activities	190,281,000	179,292,000
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	8,045,000	121,099,000
Net increase in federal funds sold	(4,025,000)	(465,000)
Purchases of available for sale debt securities	(154,104,000)	(1,375,496,000)
Proceeds from maturities, calls and paydowns of held for investment debt securities	1,350,000	72,000
Proceeds from maturities, calls and paydowns of available for sale debt securities	161,414,000	48,300,000
Proceeds from sales of available for sale securities	0	222,474,000
Purchase of equity securities	(310,000)	(3,952,000)
Proceeds from paydowns and sales of equity securities	531,000	1,378,000
Net change in loans	(532,471,000)	(405,052,000)
Net payments on derivative asset contracts	(16,817,000)	(11,019,000)
Purchases of premises, equipment and computer software	(17,695,000)	(15,105,000)
Purchase of tax credits	(6,670,000)	(4,091,000)
Other, net	24,756,000	12,547,000
Net cash used in investing activities	(535,996,000)	(1,409,310,000)
FINANCING ACTIVITIES
Net change in deposits	(450,870,000)	2,537,009,000
Net change in short-term borrowings	3,676,000	4,600,000
Issuance of common stock in connection with stock options, net	2,066,000	7,011,000
Common stock acquired	(1,820,000)
Cash dividends paid	(39,486,000)	(35,319,000)
Net cash used in financing activities	(486,434,000)	2,513,301,000
Net (decrease)/increase in cash, due from banks and interest-bearing deposits	(832,149,000)	1,283,283,000
Cash, due from banks and interest-bearing deposits at the beginning of the period	3,168,910,000	2,050,022,000
Cash, due from banks and interest-bearing deposits at the end of the period	2,336,761,000	3,333,305,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	131,864,000	20,154,000
Cash paid during the period for income taxes	42,680,000	26,780,000
Noncash investing and financing activities:
Cash (received)/consideration for acquisitions	(7,833,000)	77,685,000
Fair value of assets acquired in acquisitions	2,981,000	511,580,000
Liabilities assumed in acquisitions	10,814,000	433,896,000
Unpaid common stock dividends declared	$ 14,156,000	$ 13,143,000

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Description of Business and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2023

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, 2022.

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, 2022, 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 loan segments from 2022 have been reclassified to conform to the 2023 presentation. Such reclassifications had no effect on previously reported balance sheets, 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 Adopted During the Current Period:

In March 2022, FASB issued ASU No. 2022-02, “Financial Instruments – Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures.” ASU 2022-02 eliminated the Troubled Debt Restructurings (“TDR”) recognition and measurement guidance and, instead, required that the Company evaluate, based on the accounting for loan modifications, whether the modification represents a new loan or a continuation of an existing loan when a borrower is experiencing financial difficulty. In addition, the update required that the Company disclose current-period charge-offs by year of origination for financing receivables. The current-period charge-off amendment was applied prospectively. The amendments were effective for annual periods beginning after December 15, 2022, including interim periods within those annual periods. The Company adopted ASU 2022-02 on January 1, 2023. ASU No. 2022-02 did not have a significant impact on the Company’s consolidated financial statements.

In March 2023, FASB issued ASU No. 2023-02, "Investments - Equity Method and Joint Ventures (Topic 323)." ASU 2023-02 permits the election of accounting for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method, if certain conditions are met. Using the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense (benefit). The amendments are effective for annual periods beginning after December 15, 2023, including interim periods

within those annual periods. Early adoption is permitted for all entities in any interim period. The Company adopted the amendment as of January 1, 2023 using the modified retrospective transition. The Company has investments in New Markets Tax Credits ("NMTC") and Low-Income Housing Tax Credits ("LIHTC") that were affected by ASU 2023-02. Upon adoption of ASU No. 2023-02, the Company recorded $21.8 million in other assets and other liabilities on the consolidated balance sheet for unfunded LIHTC commitments and amortized $977,000 of NMTC investments to income tax expense during the period that would have previously been recorded to other expense. ASU No. 2023-02 did not have a significant impact on the Company’s consolidated financial statements.

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Recent Developments, Including Mergers and Acquisitions

9 Months Ended

Sep. 30, 2023

Recent Developments Including Mergers And Acquisitions [Abstract]

Recent Developments, Including Mergers and Acquisitions

(2) RECENT DEVELOPMENTS, INCLUDING MERGERS AND ACQUISITIONS

BancFirst Corporation is regulated by the Federal Reserve System as a financial holding company. On August 11, 2023, BancFirst become a Federal Reserve System member bank, which changed its primary regulator from the Federal Deposit Insurance Corporation (“FDIC”) to the Federal Reserve System. Worthington became a Federal Reserve System member bank on September 1, 2023, and Pegasus became a Federal Reserve System member bank on October 12, 2023, which changed their primary regulator from the FDIC to the Federal Reserve System.

On July 20, 2023, BancFirst purchased approximately $2.5 million in total assets, which included $2.1 million in loans, and assumed $10.8 million in deposits and other obligations, from RCB Bank's Stroud, Oklahoma branch. RCB Bank paid BancFirst $7.8 million as a result of this transaction. In addition, the Company recorded a core deposit intangible of $252,280 and goodwill of $208,752. The Company did not incur a material amount of purchase-related expenses. The effect of this purchase was included in the consolidated financial statement of the Company from the date of purchase forward. The purchase did not have a material effect on the Company's consolidated financial statements. The purchase of this branch strengthens BancFirst's presence in the Stroud, Oklahoma community.

On February 8, 2022, the Company acquired Worthington for an aggregate cash purchase price of $77.7 million. Worthington is chartered and regulated by the Texas State Banking Department with one banking location in Arlington, Texas, one in Colleyville, Texas and two in Fort Worth, Texas. At acquisition, Worthington had approximately $478 million in total assets, $257 million in loans and $430 million in deposits. Worthington will continue to operate under a separate charter and remain a separate subsidiary of the Company governed by its existing board of directors. The Company intends to provide an appropriate amount of capital or other support to increase Worthington’s ability to approve larger loans and allow Worthington to continue to grow earning assets. As a result of the acquisition, the Company recorded a core deposit intangible of $5.9 million and goodwill of $32.1 million. The Company did not incur a material amount of acquisition-related expenses. The effect of this acquisition was included in the consolidated financial statements of the Company from the date of acquisition forward. Pro forma information has not been presented because the acquisition did not have a material effect on the Company’s consolidated financial statements. The acquisition of Worthington complements the Company by expanding its Texas presence in the Dallas-Fort Worth market.

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Securities

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Securities

(3) SECURITIES

The following table summarizes the amortized cost and estimated fair values of debt securities held for investment:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
September 30, 2023	(Dollars in thousands)
Mortgage backed securities (1)	$	7	$	—	$	—	$	7
States and political subdivisions		685		—		—		685
Other securities		500		—		—		500
Total	$	1,192	$	—	$	—	$	1,192
December 31, 2022
Mortgage backed securities (1)	$	13	$	—	$	—	$	13
States and political subdivisions		1,870		—		—		1,870
Other securities		500		—		—		500
Total	$	2,383	$	—	$	—	$	2,383

The following table summarizes the amortized cost and estimated fair values of debt securities available for sale:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
September 30, 2023	(Dollars in thousands)
U.S. treasuries	$	1,564,934	$	—	$	(96,730	)	$	1,468,204
U.S. federal agencies		12,427		156		(3	)		12,580
Mortgage backed securities (1)		16,877		7		(2,472	)		14,412
States and political subdivisions		10,115		5		(189	)		9,931
Asset backed securities		12,789		—		(378	)		12,411
Other securities		8,163		—		(1,445	)		6,718
Total	$	1,625,305	$	168	$	(101,217	)	$	1,524,256
December 31, 2022
U.S. treasuries	$	1,568,563	$	—	$	(90,699	)	$	1,477,864
U.S. federal agencies		15,025		198		(1	)		15,222
Mortgage backed securities (1)		18,449		21		(1,884	)		16,586
States and political subdivisions		8,320		35		(221	)		8,134
Asset backed securities		13,371		—		(361	)		13,010
Other securities		8,163		—		(758	)		7,405
Total	$	1,631,891	$	254	$	(93,924	)	$	1,538,221

(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.

	September 30, 2023				December 31, 2022
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
	(Dollars in thousands)
Held for Investment
Contractual maturity of debt securities:
Within one year	$	350	$	350	$	1,186	$	1,186
After one year but within five years		841		841		1,195		1,195
After five years but within ten years		1		1		2		2
After ten years		—		—		—		—
Total	$	1,192	$	1,192	$	2,383	$	2,383
Available for Sale
Contractual maturity of debt securities:
Within one year	$	208,397	$	203,774	$	101,607	$	100,655
After one year but within five years		1,317,661		1,228,720		1,316,874		1,233,725
After five years but within ten years		60,974		56,159		170,513		163,101
After ten years		38,273		35,603		42,897		40,740
Total debt securities	$	1,625,305	$	1,524,256	$	1,631,891	$	1,538,221

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:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Book value of pledged securities	$	542,516	$	573,952

The following is a detail of proceeds from sales and the realized losses on available for sale debt securities:

	For the Nine Months Ended September 30,
	2023		2022
	(Dollars in thousands)
Proceeds	$	—	$	222,474
Gross losses realized		—		3,990

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 nine months ended September 30, 2023. During the nine months ended September 30, 2022, the Company sold $226 million of debt securities with an average yield of 0.16%, the proceeds of which were subsequently reinvested in $220 million of debt securities with an average yield of 1.86%. The Company used specific identification to reclassify the unrealized loss in other comprehensive income to a realized loss, as shown in the consolidated statements of comprehensive income.

Realized gains/losses on debt and equity securities are reported as securities transactions within the noninterest income section of the consolidated statements of comprehensive income.

The following table summarizes debt securities with unrealized losses, segregated by the duration of the unrealized loss, at September 30, 2023 and December 31, 2022 respectively:

			Less than 12 Months				More than 12 Months				Total
	Number of investments		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
			(Dollars in thousands)
September 30, 2023
Available for Sale
U.S. treasuries		71	$	93,372	$	2,708	$	1,374,832	$	94,022	$	1,468,204	$	96,730
U.S. federal agencies		3		1,260		3		—		—		1,260		3
Mortgage backed securities		83		1,242		38		12,887		2,434		14,129		2,472
States and political subdivisions		9		1,657		21		1,292		168		2,949		189
Asset backed securities		1		—		—		12,411		378		12,411		378
Other securities		3		—		—		6,718		1,445		6,718		1,445
Total		170	$	97,531	$	2,770	$	1,408,140	$	98,447	$	1,505,671	$	101,217
December 31, 2022
Available for Sale
U.S. treasuries		74	$	787,925	$	27,078	$	689,939	$	63,621	$	1,477,864	$	90,699
U.S. federal agencies		1		—		—		349		1		349		1
Mortgage backed securities		92		10,001		1,239		5,055		645		15,056		1,884
States and political subdivisions		8		2,308		184		464		37		2,772		221
Asset backed securities		1		13,010		361		—		—		13,010		361
Other securities		3		4,871		291		2,534		467		7,405		758
Total		179	$	818,115	$	29,153	$	698,341	$	64,771	$	1,516,456	$	93,924

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 September 30, 2023 and December 31, 2022, 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.

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Loans Held for Investment and Allowance for Credit Losses on Loans

9 Months Ended

Sep. 30, 2023

Receivables [Abstract]

Loans Held for Investment and Allowance for Credit Losses on Loans

(4) LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES ON LOANS

Loans held for investment are summarized by portfolio segment as follows:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Real estate:
Commercial real estate owner occupied		960,868		908,494
Commercial real estate non-owner occupied		1,443,831		1,383,150
Construction and development < 60 months		575,652		475,236
Construction residential real estate < 60 months		274,311		303,305
Residential real estate first lien		1,216,508		1,117,899
Residential real estate all other		230,397		196,198
Agriculture		425,930		408,037
Commercial non-real estate		1,296,796		1,241,454
Consumer non-real estate		475,721		446,756
Oil and gas		572,608		463,034
Total (1)	$	7,472,622	$	6,943,563
(1) Excludes accrued interest receivable of $37.8 million at September 30, 2023 and $30.6 million at December 31, 2022, that is recorded in accrued interest receivable and other assets.

Certain loan segments for 2022 were reclassified to conform to the 2023 presentation. Each loan segment consists of loan categories possessing similar risk characteristics. The Company’s re-alignment of the segments primarily consisted of reclassifying farmland and agriculture related loans that were previously included in consumer-related and commercial-related loans to the agriculture category. Management believes this accurately represents the risk profile of each loan segment. These reclassifications did not have a significant impact on the allowance for credit losses.

The Company's loans are currently 85% held by BancFirst and 15% 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 securities. The Company’s interest in collateral is secured through filing mortgages and liens, and in some cases, 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, 2022.

Loan Modifications, Other Real Estate Owned and Repossessed Assets and Held for Sale Assets

The following is a summary of other real estate owned and repossessed assets:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Other real estate owned and repossessed assets	$	42,782	$	36,936

As of both September 30, 2023 and December 31, 2022, other real estate owned included a commercial real estate property recorded at approximately $32.7 million and $29.4 million, respectively. 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 other 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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)
Rental income	$	2,911	$	2,437	$	8,379	$	7,750
Operating expense		2,690		2,381		8,038		7,120

During the nine months ended September 30, 2023, the Company sold property held in other real estate owned for a total gain of $342,000, compared to a total gain of $4.0 million in the nine months ended September 30, 2022.

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 modified loans was approximately $8.4 million during the period ended September 30, 2023.

Nonaccrual loans

The Company did not recognize any interest income on nonaccrual loans for either of the nine months ended September 30, 2023 or 2022. In addition, there were no nonaccrual loans for which there is no related allowance for credit losses at both September 30, 2023 and December 31, 2022. Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $1.1 million for the nine months ended September 30, 2023 and approximately $992,000 for the nine months ended September 30, 2022.

Nonaccrual loans guaranteed by government agencies totaled approximately $5.7 million at September 30, 2023 and approximately $4.7 million at December 31, 2022.

The following table is a summary of amounts included in nonaccrual loans, segregated by portfolio segment.

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Real estate:
Commercial real estate owner occupied	$	2,082	$	1,795
Commercial real estate non-owner occupied		674		667
Construction and development < 60 months		802		93
Construction residential real estate < 60 months		366		430
Residential real estate first lien		2,734		1,947
Residential real estate all other		833		55
Agriculture		2,305		2,734
Commercial non-real estate		6,465		7,066
Consumer non-real estate		332		192
Oil and gas		83		320
Total	$	16,676	$	15,299

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
(Dollars in thousands)	30-59 Days Past Due		60-89 Days Past Due		90 Days and Greater		Total Past Due Loans		Current Loans		Total Loans		Accruing Loans 90 Days or More Past Due
As of September 30, 2023
Real estate:
Commercial real estate owner occupied	$	1,490	$	671	$	6,522	$	8,683	$	952,185	$	960,868	$	4,928
Commercial real estate non-owner occupied		—		40		1,198		1,238		1,442,593		1,443,831		524
Construction and development < 60 months		9,161		—		1,186		10,347		565,305		575,652		384
Construction residential real estate < 60 months		424		97		543		1,064		273,247		274,311		543
Residential real estate first lien		3,104		543		2,877		6,524		1,209,984		1,216,508		1,120
Residential real estate all other		647		252		861		1,760		228,637		230,397		100
Agriculture		3,413		380		3,925		7,718		418,212		425,930		3,166
Commercial non-real estate		3,439		1,226		5,589		10,254		1,286,542		1,296,796		1,323
Consumer non-real estate		2,322		635		462		3,419		472,302		475,721		353
Oil and gas		115		—		217		332		572,276		572,608		134
Total	$	24,115	$	3,844	$	23,380	$	51,339	$	7,421,283	$	7,472,622	$	12,575
	30-59 Days Past Due		60-89 Days Past Due		90 Days and Greater		Total Past Due Loans		Current Loans		Total Loans		Accruing Loans 90 Days or More Past Due
As of December 31, 2022
Real estate:
Commercial real estate owner occupied	$	1,314	$	1,524	$	4,580	$	7,418	$	901,076	$	908,494	$	4,580
Commercial real estate non-owner occupied		6,237		—		42		6,279		1,376,871		1,383,150		43
Construction and development < 60 months		535		40		114		689		474,547		475,236		81
Construction residential real estate < 60 months		1,320		282		148		1,750		301,555		303,305		—
Residential real estate first lien		3,415		1,076		844		5,335		1,112,564		1,117,899		349
Residential real estate all other		265		37		185		487		195,711		196,198		166
Agriculture		2,357		34		2,265		4,656		403,381		408,037		1,054
Commercial non-real estate		2,490		2,142		2,772		7,404		1,234,050		1,241,454		345
Consumer non-real estate		2,591		648		585		3,824		442,932		446,756		467
Oil and gas		654		—		—		654		462,380		463,034		—
Total	$	21,178	$	5,783	$	11,535	$	38,496	$	6,905,067	$	6,943,563	$	7,085

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 classification 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, 2022, are disclosed in Note (5) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

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)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
As of September 30, 2023
Commercial real estate owner occupied
Grade 1	$	99,990	$	155,460	$	120,444	$	87,838	$	82,081	$	139,298	$	23,622	$	708,733
Grade 2		29,812		57,975		37,289		23,581		21,509		30,107		34,361		234,634
Grade 3		142		3,582		4,304		652		1,899		1,075		2,437		14,091
Grade 4		27		159		200		850		665		1,020		150		3,071
Grade 5		—		—		—		—		339		—		—		339
Total commercial real estate owner occupied		129,971		217,176		162,237		112,921		106,493		171,500		60,570		960,868
Commercial real estate non-owner occupied
Grade 1	$	160,303	$	255,862	$	176,995	$	122,636	$	59,973	$	72,918	$	47,780	$	896,467
Grade 2		74,860		155,293		81,452		53,753		62,989		73,789		28,722		530,858
Grade 3		—		6,736		1,717		149		6,207		299		—		15,108
Grade 4		200		632		—		—		—		566		—		1,398
Total commercial real estate non-owner occupied		235,363		418,523		260,164		176,538		129,169		147,572		76,502		1,443,831
Construction and development < 60 months
Grade 1	$	91,548	$	123,068	$	73,070	$	8,484	$	6,842	$	5,403	$	61,474	$	369,889
Grade 2		59,837		50,514		33,168		6,629		13,572		2,381		34,350		200,451
Grade 3		3,308		893		102		97		—		7		—		4,407
Grade 4		—		903		—		—		—		2		—		905
Total construction and development < 60 months		154,693		175,378		106,340		15,210		20,414		7,793		95,824		575,652
Construction residential real estate < 60 months
Grade 1	$	136,871	$	36,431	$	1,441	$	102	$	2	$	37	$	37,179	$	212,063
Grade 2		44,707		9,530		32		22		—		382		549		55,222
Grade 3		5,730		387		—		—		—		—		—		6,117
Grade 4		366		543		—		—		—		—		—		909
Total construction residential real estate < 60 months		187,674		46,891		1,473		124		2		419		37,728		274,311
Residential real estate first lien
Grade 1	$	223,552	$	238,614	$	177,122	$	121,747	$	74,016	$	155,802	$	2,918	$	993,771
Grade 2		41,655		40,971		39,280		25,018		13,617		43,460		—		204,001
Grade 3		2,282		1,902		2,626		1,327		1,606		4,202		—		13,945
Grade 4		384		172		1,246		346		440		2,203		—		4,791
Total residential real estate first lien		267,873		281,659		220,274		148,438		89,679		205,667		2,918		1,216,508
Residential real estate all other
Grade 1	$	35,422	$	27,339	$	8,166	$	8,242	$	3,963	$	13,045	$	41,474	$	137,651
Grade 2		2,828		5,088		2,210		1,958		1,546		3,272		71,527		88,429
Grade 3		416		353		74		42		41		440		1,925		3,291
Grade 4		—		24		—		—		95		45		862		1,026
Total residential real estate all other		38,666		32,804		10,450		10,242		5,645		16,802		115,788		230,397
Agriculture
Grade 1	$	47,552	$	55,420	$	35,685	$	29,284	$	17,863	$	33,652	$	39,462	$	258,918
Grade 2		28,366		24,237		19,989		10,303		9,369		17,304		35,554		145,122
Grade 3		8,891		856		854		3,433		323		2,696		2,896		19,949
Grade 4		41		901		217		134		384		244		20		1,941
Total Agriculture		84,850		81,414		56,745		43,154		27,939		53,896		77,932		425,930
Commercial non-real estate
Grade 1	$	204,828	$	186,934	$	167,915	$	40,328	$	39,003	$	39,326	$	281,116	$	959,450
Grade 2		80,383		43,067		25,617		15,244		10,064		9,171		137,965		321,511
Grade 3		1,840		3,149		1,073		163		563		1,103		2,648		10,539
Grade 4		1,038		1,408		304		690		309		129		1,154		5,032
Grade 5		—		—		—		—		264		—		—		264
Total commercial non-real estate		288,089		234,558		194,909		56,425		50,203		49,729		422,883		1,296,796
Consumer non-real estate
Grade 1	$	175,483	$	123,675	$	64,280	$	22,331	$	10,804	$	3,518	$	24,688	$	424,779
Grade 2		15,347		16,509		7,792		2,502		809		1,614		1,764		46,337
Grade 3		562		1,198		957		325		285		155		12		3,494
Grade 4		123		402		384		103		85		12		2		1,111
Total consumer non-real estate		191,515		141,784		73,413		25,261		11,983		5,299		26,466		475,721
Oil and gas
Grade 1	$	157,820	$	26,772	$	52,090	$	9,850	$	1,630	$	16,141	$	170,256	$	434,559
Grade 2		41,447		7,180		1,999		414		306		217		83,009		134,572
Grade 3		134		1,922		413		2		13		167		743		3,394
Grade 4		—		83		—		—		—		—		—		83
Total oil and gas		199,401		35,957		54,502		10,266		1,949		16,525		254,008		572,608
Total loans held for investment	$	1,778,095	$	1,666,144	$	1,140,507	$	598,579	$	443,476	$	675,202	$	1,170,619	$	7,472,622

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
(Dollars in thousands)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
Three months ended September 30, 2023
Commercial real estate owner occupied
Current-period gross charge-offs	$	174	$	189	$	25	$	112	$	147	$	158	$	—	$	805
Commercial real estate non-owner occupied
Current-period gross charge-offs		—		—		—		—		—		—		—		—
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		—		—		71		11		—		18		—		100
Residential real estate all other
Current-period gross charge-offs		—		—		—		—		—		—		—		—
Agriculture
Current-period gross charge-offs		—		150		9		—		—		—		—		159
Commercial non-real estate
Current-period gross charge-offs		19		15		46		—		51		108		—		239
Consumer non-real estate
Current-period gross charge-offs		192		146		56		12		1		18		2		427
Oil and gas
Current-period gross charge-offs		—		—		—		—		—		—		—		—
Total current-period gross charge-offs	$	385	$	500	$	207	$	135	$	199	$	302	$	2	$	1,730

	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans
(Dollars in thousands)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
Nine months ended September 30, 2023
Commercial real estate owner occupied
Current-period gross charge-offs	$	174	$	196	$	26	$	134	$	165	$	158	$	—	$	853
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		—		—		90		32		—		22		—		144
Residential real estate all other
Current-period gross charge-offs		—		4		19		—		1		4		—		28
Agriculture
Current-period gross charge-offs		—		154		9		317		14		2		—		496
Commercial non-real estate
Current-period gross charge-offs		61		116		109		20		51		160		—		517
Consumer non-real estate
Current-period gross charge-offs		221		408		203		41		38		35		19		965
Oil and gas
Current-period gross charge-offs		—		2		—		—		—		—		—		2
Total current-period gross charge-offs	$	456	$	882	$	456	$	546	$	269	$	384	$	19	$	3,012

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 CECL model. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist.

The following table details 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 beginning of period		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Three Months Ended September 30, 2023
Real estate:
Commercial real estate owner occupied	$	6,808	$	(805	)	$	3	$	(802	)	$	809		$	6,815
Commercial real estate non-owner occupied		33,432		—			—		—			1,182			34,614
Construction and development < 60 months		3,440		—			3		3			467			3,910
Construction residential real estate < 60 months		3,553		—			—		—			(9	)		3,544
Residential real estate first lien		4,755		(100	)		—		(100	)		109			4,764
Residential real estate all other		1,661		—			1		1			3			1,665
Agriculture		6,426		(159	)		—		(159	)		166			6,433
Commercial non-real estate		25,127		(239	)		243		4			(886	)		24,245
Consumer non-real estate		4,344		(427	)		24		(403	)		448			4,389
Oil and gas		7,374		—			—		—			23			7,397
Total	$	96,920	$	(1,730	)	$	274	$	(1,456	)	$	2,312		$	97,776

	Allowance for Credit Losses
	Balance at beginning of period		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Nine Months Ended September 30, 2023
Real estate:
Commercial real estate owner occupied	$	6,416	$	(853	)	$	55	$	(798	)	$	1,197		$	6,815
Commercial real estate non-owner occupied		30,190		(3	)		—		(3	)		4,427			34,614
Construction and development < 60 months		3,778		(4	)		9		5			127			3,910
Construction residential real estate < 60 months		3,275		—			—		—			269			3,544
Residential real estate first lien		4,092		(144	)		13		(131	)		803			4,764
Residential real estate all other		1,418		(28	)		4		(24	)		271			1,665
Agriculture		6,217		(496	)		13		(483	)		699			6,433
Commercial non-real estate		25,106		(517	)		392		(125	)		(736	)		24,245
Consumer non-real estate		4,132		(965	)		116		(849	)		1,106			4,389
Oil and gas		8,104		(2	)		—		(2	)		(705	)		7,397
Total	$	92,728	$	(3,012	)	$	602	$	(2,410	)	$	7,458		$	97,776

	Allowance for Credit Losses
	Balance at beginning of period		Initial allowance on loans purchased with credit deterioration			Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Three Months Ended September 30, 2022
Real estate:
Commercial real estate owner occupied	$	6,928	$	—		$	—		$	426	$	426		$	(231	)	$	7,123
Commercial real estate non-owner occupied		16,315		—			—			—		—			7,371			23,686
Construction and development < 60 months		3,680		—			—			3		3			461			4,144
Construction residential real estate < 60 months		1,183		—			—			—		—			1,124			2,307
Residential real estate first lien		3,355		—			(11	)		15		4			(18	)		3,341
Residential real estate all other		1,480		—			(2	)		1		(1	)		84			1,563
Agriculture		7,956		—			(80	)		1		(79	)		629			8,506
Commercial non-real estate		25,370		(4	)		(187	)		26		(161	)		(251	)		24,954
Consumer non-real estate		4,050		(3	)		(171	)		59		(112	)		270			4,205
Oil and gas		16,618		—			—			—		—			(6,576	)		10,042
Total	$	86,935	$	(7	)	$	(451	)	$	531	$	80		$	2,863		$	89,871

	Allowance for Credit Losses
	Balance at beginning of period		Initial allowance on loans purchased with credit deterioration		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Nine Months Ended September 30, 2022
Real estate:
Commercial real estate owner occupied	$	7,550	$	—	$	(20	)	$	504	$	484		$	(911	)	$	7,123
Commercial real estate non-owner occupied		16,807		—		—			—		—			6,879			23,686
Construction and development < 60 months		3,454		—		—			8		8			682			4,144
Construction residential real estate < 60 months		1,051		—		—			—		—			1,256			2,307
Residential real estate first lien		3,048		2		(60	)		28		(32	)		323			3,341
Residential real estate all other		1,567		—		(38	)		403		365			(369	)		1,563
Agriculture		8,392		—		(205	)		8		(197	)		311			8,506
Commercial non-real estate		25,565		44		(961	)		162		(799	)		144			24,954
Consumer non-real estate		3,694		25		(404	)		139		(265	)		751			4,205
Oil and gas		12,808		—		—			—		—			(2,766	)		10,042
Total	$	83,936	$	71	$	(1,688	)	$	1,252	$	(436	)	$	6,300		$	89,871

Purchased Credit Deteriorated Loans

The Company has 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 nine month period ended September 30, 2023. The credit-deteriorated loans purchased during the nine months ended September 30, 2022 were as follows:

	Loans acquired with deteriorated credit quality
	(Dollars in thousands)
For the period ended September 30, 2022
Purchase price of loans at acquisition	$	661
Allowance for credit losses at acquisition		71
Par value of acquired loans at acquisition	$	732

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 nine months ended September 30, 2023 and 2022, no material amount of interest income was recognized on collateral-dependent loans subsequent to their classification as collateral-dependent. The following table summarizes collateral-dependent gross loans held for investment by collateral type and the related specific allocation as follows:

	Collateral Type
	Real Estate		Business Assets		Energy Reserves		Other Assets		Total		Specific Allocation
	(Dollars in thousands)
As of September 30, 2023
Real estate:
Commercial real estate owner occupied	$	—	$	—	$	—	$	—	$	—	$	—
Commercial real estate non-owner occupied		632		—		—		—		632		250
Construction and development < 60 months		—		—		—		—		—		—
Construction residential real estate < 60 months		366		—		—		—		366		45
Residential real estate first lien		214		—		—		—		214		65
Residential real estate all other		57		—		—		—		57		60
Agriculture		3,191		603		—		3,039		6,833		2,586
Commercial non-real estate		—		4,902		—		37		4,939		1,229
Consumer non-real estate		—		14		—		79		93		65
Oil and gas		—		—		—		—		—		—
Total collateral-dependent loans held for investment	$	4,460	$	5,519	$	—	$	3,155	$	13,134	$	4,300
	Collateral Type
	Real Estate		Business Assets		Energy Reserves		Other Assets		Total		Specific Allocation
	(Dollars in thousands)
As of December 31, 2022
Real estate:
Commercial real estate owner occupied	$	2,213	$	—	$	—	$	—	$	2,213	$	870
Commercial real estate non-owner occupied		1,263		—		—		—		1,263		333
Construction and development < 60 months		—		—		—		—		—		—
Construction residential real estate < 60 months		420		—		—		—		420		45
Residential real estate first lien		481		—		—		—		481		207
Residential real estate all other		9		—		—		—		9		9
Agriculture		3,447		701		—		3,592		7,740		3,114
Commercial non-real estate		—		5,924		—		4		5,928		1,938
Consumer non-real estate		—		—		—		117		117		81
Oil and gas		—		—		—		—		—		—
Total collateral-dependent loans held for investment	$	7,833	$	6,625	$	—	$	3,713	$	18,171	$	6,597

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:

	Nine Months Ended September 30,
	2023		2022
	(Dollars in thousands)
Other real estate owned	$	2,236	$	4,393
Repossessed assets		1,448		696
Total	$	3,684	$	5,089

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Intangible Assets and Goodwill

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

(5) INTANGIBLE ASSETS AND GOODWILL

The following is a summary of intangible assets as of the date listed:

	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(Dollars in thousands)
September 30, 2023
Core deposit intangibles	$	33,550	$	(16,170	)	$	17,380
Customer relationship intangibles		3,350		(3,139	)		211
Total	$	36,900	$	(19,309	)	$	17,591
December 31, 2022
Core deposit intangibles	$	33,298	$	(13,615	)	$	19,683
Customer relationship intangibles		3,350		(3,050	)		300
Total	$	36,648	$	(16,665	)	$	19,983

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)
Nine months ended September 30, 2023
Balance at beginning of period	$	13,767	$	61,212	$	68,855	$	32,133	$	5,464	$	624	$	182,055
Acquisitions		—		208		—		—		—		—		208
Balance at end of period	$	13,767	$	61,420	$	68,855	$	32,133	$	5,464	$	624	$	182,263

The Company purchased a branch from RCB bank on July 20, 2023, which added goodwill as shown in the table above. See Note (2) of the Notes to the Consolidated Financial Statements for disclosure regarding the Company's recent developments, including mergers and acquisitions.

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, 2022.

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Subordinated Debt

9 Months Ended

Sep. 30, 2023

Broker-Dealer [Abstract]

Subordinated Debt

(6) 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 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 were callable at par, in whole or in part, after 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 have been structured to qualify as Tier 2 capital under bank regulatory guidelines. The net proceeds to the Company from the sale of the Subordinated Notes were approximately $59.15 million after deducting commissions and offering expenses of $850,000. The Company used the proceeds from the sale of the Subordinated Notes for general

corporate purposes. The Subordinated Notes will 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.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

(7) 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 September 30, 2023 there were 490,925 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
Nine Months Ended September 30, 2023
Nonvested at December 31, 2022		—
Granted		9,075	$	96.39
Nonvested at September 30, 2023		9,075

The Company has had the BancFirst Corporation Directors’ Deferred Stock Compensation Plan (the “Deferred Stock Compensation Plan”) since May 1999. As of September 30, 2023, there are 20,262 shares available for future issuance under the Deferred Stock Compensation Plan. The Deferred Stock Compensation Plan will terminate on December 31, 2024, 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 18,136 and 16,684 shares of common stock distributed from the Deferred Stock Compensation Plan during the nine months ended September 30, 2023 and 2022, respectively.

A summary of the accumulated stock units is as follows:

	September 30,		December 31,
	2023		2022
Accumulated stock units		117,499		129,609
Average price	$	39.20	$	34.91

The Company had the BancFirst Corporation Stock Option Plan (the “Employee Plan”), which was terminated 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 had the BancFirst Corporation Non-Employee Directors’ Stock Option Plan (the “Non-Employee Directors’ Plan”), which was terminated 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)
Nine Months Ended September 30, 2023
Outstanding at December 31, 2022		1,310,290		$	52.51
Exercised		(48,399	)		33.34
Canceled, forfeited, or expired		(8,500	)		87.97
Outstanding at September 30, 2023		1,253,391			53.01	9.94 Yrs.	$	42,268
Exercisable at September 30, 2023		502,891			33.32	6.43 Yrs.	$	26,857

The following table has additional information regarding options exercised under both the Employee Plan and the Non-Employee Directors’ Plan:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Total intrinsic value of options exercised	$	176	$	5,638	$	2,507	$	14,581
Cash received from options exercised		75		2,285		1,614		6,577
Tax benefit realized from options exercised		43		1,355		603		3,505

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model and is based on certain assumptions including risk-free rate of return, dividend yield, stock price volatility and the expected term. The fair value of each option is expensed over its vesting period. The risk-free interest rate is determined by reference to the spot zero-coupon rate for the U.S. Treasury security with a maturity similar to the expected term of the options. The dividend yield is the expected yield for the expected term. The stock price volatility is estimated from the recent historical volatility of the Company’s stock. The expected term is estimated from the historical option exercise experience. The Company accounts for forfeitures as they occur. No stock options were granted during the nine months ended September 30, 2023.

The following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented:

	Nine Months Ended September 30,
	2023		2022
Weighted average grant-date fair value per share of options granted	$	—	$	30.72
Risk-free interest rate		—	1.75 to 3.25%
Dividend yield		—	2.00%
Stock price volatility		—	34.61 to 34.85%
Expected term		—	10 Yrs

The Company currently uses newly issued shares for stock option exercises and restricted stock units, 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 nine months ended September 30, 2023 or September 30, 2022.

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Stock-based compensation expense	$	864	$	627	$	2,077	$	1,545
Tax benefit		208		151		500		372
Stock-based compensation expense, net of tax	$	656	$	476	$	1,577	$	1,173

The Company will continue to amortize the unearned stock-based compensation expense over the remaining weighted average vesting period of approximately 5 years for unvested stock options and 6 years for unvested RSUs. The following table shows the unearned stock-based compensation expense for unvested stock options and unvested RSUs:

	September 30, 2023
	(Dollars in thousands)
Unearned stock-based compensation expense for unvested stock options	$	10,957
Unearned stock-based compensation expense for unvested RSUs		850

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Stockholders' Equity

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Stockholders' Equity

(8) STOCKHOLDERS’ EQUITY

In November 1999, the Company adopted 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 may be determined by management and approved by the Company’s Executive Committee.

The following table is a summary of the shares purchased under the program during the period indicated and the shares remaining to be repurchased in the program:

	For the Nine Months Ended September 30,
	2023		2022
Number of shares repurchased		20,702		—
Average price of shares repurchased	$	87.88	$	—
Shares remaining to be repurchased		479,784		500,486

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 BancFirst Corporation’s, BancFirst’s, Pegasus’s and Worthington's 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 September 30, 2023, BancFirst Corporation, BancFirst, Pegasus and Worthington 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 September 30, 2023:
Total Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,430,965	16.90%	$	677,482	8.00%	$	889,196	10.50%	N/A		N/A
BancFirst		1,189,612	16.36%		581,616	8.00%		763,371	10.50%	$	727,020	10.00%
Pegasus		143,898	18.16%		63,389	8.00%		83,199	10.50%		79,237	10.00%
Worthington		50,731	12.92%		31,401	8.00%		41,214	10.50%		39,251	10.00%
Common Equity Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,247,907	14.74%	$	381,084	4.50%	$	592,797	7.00%	N/A		N/A
BancFirst		1,083,583	14.90%		327,159	4.50%		508,914	7.00%	$	472,563	6.50%
Pegasus		135,463	17.10%		35,657	4.50%		55,466	7.00%		51,504	6.50%
Worthington		46,814	11.93%		17,663	4.50%		27,476	7.00%		25,513	6.50%
Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,273,907	15.04%	$	508,112	6.00%	$	719,825	8.50%	N/A		N/A
BancFirst		1,103,583	15.18%		436,212	6.00%		617,967	8.50%	$	581,616	8.00%
Pegasus		135,463	17.10%		47,542	6.00%		67,351	8.50%		63,389	8.00%
Worthington		46,814	11.93%		23,551	6.00%		33,363	8.50%		31,401	8.00%
Tier 1 Capital
(to Quarterly Average Assets)-
BancFirst Corporation	$	1,273,907	10.70%	$	476,200	4.00%	N/A		N/A	N/A		N/A
BancFirst		1,103,583	10.85%		406,769	4.00%	N/A		N/A	$	508,461	5.00%
Pegasus		135,463	11.26%		48,117	4.00%	N/A		N/A		60,146	5.00%
Worthington		46,814	8.88%		21,086	4.00%	N/A		N/A		26,358	5.00%

As of September 30, 2023, the most recent notifications from the Federal Reserve Bank of Kansas City, the FDIC and the Comptroller of the Currency, categorized BancFirst, Pegasus and Worthington 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 have continued to be included in Tier 1 capital, as the Company’s total assets do not exceed $15 billion. The Company's Subordinated Notes have been structured to qualify as Tier 2 capital under bank regulatory guidelines. There are no conditions or events since the most recent notifications to BancFirst Corporation, BancFirst, Pegasus and Worthington of their capital category that management believes would materially change their category under capital requirements existing as of the report date.

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Net Income Per Common Share

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Net Income Per Common Share

(9) NET INCOME PER COMMON SHARE

Basic and diluted net income per common share are calculated as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands, except per share data)
(Numerator)
Income available to common stockholders	$	50,988	$	55,352	$	163,531	$	135,974
(Denominator)
Weighted average shares outstanding for basic earnings per common share		32,937,149		32,825,931		32,916,996		32,748,116
Dilutive effect of stock compensation		602,240		710,627		576,019		681,045
Weighted-average shares outstanding for diluted earnings per common share		33,539,389		33,536,558		33,493,015		33,429,161
Basic earnings per share	$	1.55	$	1.69	$	4.97	$	4.15
Diluted earnings per share	$	1.52	$	1.65	$	4.88	$	4.07

The following table shows the number of options and RSUs 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 September 30, 2023		263,176
Three Months Ended September 30, 2022		184,707
Nine Months Ended September 30, 2023		278,828
Nine Months Ended September 30, 2022		149,669

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Fair Value Measurements

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

(10) 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 the 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 a small amount of municipal revenue bonds. Pricing for such instruments is fairly generic and 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)
September 30, 2023
Debt securities available for sale:
U.S. Treasury	$	1,468,204	$	—	$	—	$	1,468,204
U.S. federal agencies		—		12,580		—		12,580
Mortgage-backed securities		—		14,412		—		14,412
States and political subdivisions		—		9,502		429		9,931
Asset backed securities		—		12,411		—		12,411
Other debt securities		—		6,718		—		6,718
Derivative assets		—		21,686		—		21,686
Derivative liabilities		—		19,558		—		19,558
December 31, 2022
Debt securities available for sale:
U.S. Treasury	$	1,477,864	$	—	$	—	$	1,477,864
U.S. federal agencies		—		15,222		—		15,222
Mortgage-backed securities		—		16,586		—		16,586
States and political subdivisions		—		7,680		454		8,134
Asset backed securities		—		13,010		—		13,010
Other debt securities				7,405				7,405
Derivative assets		—		20,745		—		20,745
Derivative liabilities		—		19,683		—		19,683

The changes in Level 3 assets measured at estimated fair value on a recurring basis during the periods presented were as follows:

	Nine Months Ended September 30,			Twelve Months Ended December 31,
	2023			2022
	(Dollars in thousands)
Balance at the beginning of the year	$	454		$	320
Purchases		—			255
Settlements		(30	)		(110	)
Total unrealized gain		5			(11	)
Balance at the end of the period	$	429		$	454

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 nine months ended September 30, 2023, the Company did not transfer any debt securities. In addition, during the year ended December 31, 2022, the Company did not transfer any debt securities.

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; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These 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 September 30, 2023
Equity securities	$	14,827
Collateral dependent loans		363
Repossessed assets		348
Other real estate owned		6,453
As of and for the Year-to-date Period Ended December 31, 2022
Equity securities	$	15,512
Collateral dependent loans		1,618
Repossessed assets		180
Other real estate owned		34,999

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 were 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:

	September 30, 2023				December 31, 2022
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Dollars in thousands)
FINANCIAL ASSETS
Level 2 inputs:
Cash and cash equivalents	$	2,336,761	$	2,336,761	$	3,168,910	$	3,168,910
Federal funds sold		6,875		6,875		2,850		2,850
Debt securities held for investment		7		7		13		13
Loans held for sale		3,852		3,852		6,232		6,232
Level 3 inputs:
Debt securities held for investment		1,185		1,185		2,370		2,370
Loans, net of allowance for credit losses		7,374,846		7,065,173		6,850,835		6,563,755
FINANCIAL LIABILITIES
Level 2 inputs:
Deposits		10,534,171		10,098,240		10,974,228		10,614,840
Short-term borrowings		3,976		3,976		300		300
Subordinated debt		86,086		76,771		86,044		82,385
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments				4,714				4,598
Letters of credit				589				542

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. Certain non-financial assets and non-financial liabilities measured at fair value on a nonrecurring basis include intangible assets and other non-financial long-lived assets measured at fair value and adjusted for impairment. These items are evaluated at least annually for impairment. The overall levels of non-financial assets and non-financial liabilities measured at fair value on a nonrecurring basis were not considered to be significant to the Company at September 30, 2023 or December 31, 2022.

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

(11) 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. The Company had a margin asset included in other assets in the amount of $22.3 million at September 30, 2023 and $6.6 million at December 31, 2022.

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:

		September 30, 2023						December 31, 2022
Oil and Natural Gas Swaps and Options	Notional Units	Notional Amount			Estimated Fair Value			Notional Amount			Estimated Fair Value
		(Notional amounts and dollars in thousands)
Oil
Derivative assets	Barrels		4,041		$	12,352			2,698		$	8,868
Derivative liabilities	Barrels		(4,041	)		(11,204	)		(2,698	)		(8,259	)
Gas/Natural Gas Liquids
Derivative assets	MMBTUs/Gallons		54,266			9,334			25,059			11,877
Derivative liabilities	MMBTUs/Gallons		(54,266	)		(8,354	)		(25,059	)		(11,424	)
Total Fair Value	Included in
Derivative assets	Other assets					21,686						20,745
Derivative liabilities	Other liabilities					(19,558	)					(19,683	)

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Derivative income	$	115	$	118	$	464	$	406

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:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Credit exposure	$	—	$	6,560

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.

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Segment Information

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Segment Information

(12) 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 Dallas and Fort Worth metropolitan areas. 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 Banks		BancFirst Community Banks		Pegasus		Worthington		Other Financial Services		Executive, Operations & Support			Eliminations			Consolidated
	(Dollars in thousands)
Three Months Ended September 30, 2023
Net interest income	$	30,258	$	56,644	$	11,334	$	4,160	$	1,063	$	849		$	—		$	104,308
Noninterest income		5,533		15,986		561		301		14,542		59,923			(52,397	)		44,449
Income before taxes		22,043		38,985		6,559		693		5,541		43,282			(51,873	)		65,230
Three Months Ended September 30, 2022
Net interest income	$	26,022	$	55,782	$	13,815	$	4,723	$	1,604	$	(999	)	$	—		$	100,947
Noninterest income		8,722		18,764		246		305		14,106		62,969			(55,781	)		49,331
Income before taxes		22,827		41,179		8,178		2,109		6,222		43,180			(55,358	)		68,337
Nine Months Ended September 30, 2023
Net interest income	$	90,266	$	171,946	$	39,994	$	12,907	$	3,063	$	1,214		$	—		$	319,390
Noninterest income		18,710		55,504		1,242		835		41,064		189,754			(166,858	)		140,251
Income before taxes		66,941		125,768		26,060		3,114		16,003		137,624			(165,969	)		209,541
Nine Months Ended September 30, 2022
Net interest income	$	67,592	$	149,965	$	31,399	$	10,160	$	6,596	$	(2,411	)	$	20		$	263,321
Noninterest income		23,999		53,761		730		724		37,842		158,299			(139,776	)		135,579
Income before taxes		56,140		108,980		15,677		3,930		16,910		104,729			(139,073	)		167,293
Total Assets:
September 30, 2023	$	3,533,334	$	6,929,256	$	1,308,938	$	574,929	$	62,118	$	1,212,338		$	(1,506,311	)	$	12,114,602
December 31, 2022		3,412,369		6,886,066		1,404,033		541,002		171,679		1,473,443			(1,500,729	)		12,387,863

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

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Description of Business and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2023

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, 2022, 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 loan segments from 2022 have been reclassified to conform to the 2023 presentation. Such reclassifications had no effect on previously reported balance sheets, 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 Adopted During the Current Period:

In March 2022, FASB issued ASU No. 2022-02, “Financial Instruments – Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures.” ASU 2022-02 eliminated the Troubled Debt Restructurings (“TDR”) recognition and measurement guidance and, instead, required that the Company evaluate, based on the accounting for loan modifications, whether the modification represents a new loan or a continuation of an existing loan when a borrower is experiencing financial difficulty. In addition, the update required that the Company disclose current-period charge-offs by year of origination for financing receivables. The current-period charge-off amendment was applied prospectively. The amendments were effective for annual periods beginning after December 15, 2022, including interim periods within those annual periods. The Company adopted ASU 2022-02 on January 1, 2023. ASU No. 2022-02 did not have a significant impact on the Company’s consolidated financial statements.

In March 2023, FASB issued ASU No. 2023-02, "Investments - Equity Method and Joint Ventures (Topic 323)." ASU 2023-02 permits the election of accounting for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method, if certain conditions are met. Using the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense (benefit). The amendments are effective for annual periods beginning after December 15, 2023, including interim periods

within those annual periods. Early adoption is permitted for all entities in any interim period. The Company adopted the amendment as of January 1, 2023 using the modified retrospective transition. The Company has investments in New Markets Tax Credits ("NMTC") and Low-Income Housing Tax Credits ("LIHTC") that were affected by ASU 2023-02. Upon adoption of ASU No. 2023-02, the Company recorded $21.8 million in other assets and other liabilities on the consolidated balance sheet for unfunded LIHTC commitments and amortized $977,000 of NMTC investments to income tax expense during the period that would have previously been recorded to other expense. ASU No. 2023-02 did not have a significant impact on the Company’s consolidated financial statements.

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Securities (Tables)

9 Months Ended

Sep. 30, 2023

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 Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
September 30, 2023	(Dollars in thousands)
Mortgage backed securities (1)	$	7	$	—	$	—	$	7
States and political subdivisions		685		—		—		685
Other securities		500		—		—		500
Total	$	1,192	$	—	$	—	$	1,192
December 31, 2022
Mortgage backed securities (1)	$	13	$	—	$	—	$	13
States and political subdivisions		1,870		—		—		1,870
Other securities		500		—		—		500
Total	$	2,383	$	—	$	—	$	2,383

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 Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
September 30, 2023	(Dollars in thousands)
U.S. treasuries	$	1,564,934	$	—	$	(96,730	)	$	1,468,204
U.S. federal agencies		12,427		156		(3	)		12,580
Mortgage backed securities (1)		16,877		7		(2,472	)		14,412
States and political subdivisions		10,115		5		(189	)		9,931
Asset backed securities		12,789		—		(378	)		12,411
Other securities		8,163		—		(1,445	)		6,718
Total	$	1,625,305	$	168	$	(101,217	)	$	1,524,256
December 31, 2022
U.S. treasuries	$	1,568,563	$	—	$	(90,699	)	$	1,477,864
U.S. federal agencies		15,025		198		(1	)		15,222
Mortgage backed securities (1)		18,449		21		(1,884	)		16,586
States and political subdivisions		8,320		35		(221	)		8,134
Asset backed securities		13,371		—		(361	)		13,010
Other securities		8,163		—		(758	)		7,405
Total	$	1,631,891	$	254	$	(93,924	)	$	1,538,221

(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.

	September 30, 2023				December 31, 2022
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
	(Dollars in thousands)
Held for Investment
Contractual maturity of debt securities:
Within one year	$	350	$	350	$	1,186	$	1,186
After one year but within five years		841		841		1,195		1,195
After five years but within ten years		1		1		2		2
After ten years		—		—		—		—
Total	$	1,192	$	1,192	$	2,383	$	2,383
Available for Sale
Contractual maturity of debt securities:
Within one year	$	208,397	$	203,774	$	101,607	$	100,655
After one year but within five years		1,317,661		1,228,720		1,316,874		1,233,725
After five years but within ten years		60,974		56,159		170,513		163,101
After ten years		38,273		35,603		42,897		40,740
Total debt securities	$	1,625,305	$	1,524,256	$	1,631,891	$	1,538,221

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:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Book value of pledged securities	$	542,516	$	573,952

Proceeds from Sales and Realized Losses on Available foe Sale Debt Securities

The following is a detail of proceeds from sales and the realized losses on available for sale debt securities:

	For the Nine Months Ended September 30,
	2023		2022
	(Dollars in thousands)
Proceeds	$	—	$	222,474
Gross losses realized		—		3,990

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 September 30, 2023 and December 31, 2022 respectively:

			Less than 12 Months				More than 12 Months				Total
	Number of investments		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
			(Dollars in thousands)
September 30, 2023
Available for Sale
U.S. treasuries		71	$	93,372	$	2,708	$	1,374,832	$	94,022	$	1,468,204	$	96,730
U.S. federal agencies		3		1,260		3		—		—		1,260		3
Mortgage backed securities		83		1,242		38		12,887		2,434		14,129		2,472
States and political subdivisions		9		1,657		21		1,292		168		2,949		189
Asset backed securities		1		—		—		12,411		378		12,411		378
Other securities		3		—		—		6,718		1,445		6,718		1,445
Total		170	$	97,531	$	2,770	$	1,408,140	$	98,447	$	1,505,671	$	101,217
December 31, 2022
Available for Sale
U.S. treasuries		74	$	787,925	$	27,078	$	689,939	$	63,621	$	1,477,864	$	90,699
U.S. federal agencies		1		—		—		349		1		349		1
Mortgage backed securities		92		10,001		1,239		5,055		645		15,056		1,884
States and political subdivisions		8		2,308		184		464		37		2,772		221
Asset backed securities		1		13,010		361		—		—		13,010		361
Other securities		3		4,871		291		2,534		467		7,405		758
Total		179	$	818,115	$	29,153	$	698,341	$	64,771	$	1,516,456	$	93,924

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Loans Held for Investment and Allowance for Credit Losses on Loans (Tables)

9 Months Ended

Sep. 30, 2023

Receivables [Abstract]

Summary of Loans Held for Investment by Portfolio Segment

Loans held for investment are summarized by portfolio segment as follows:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Real estate:
Commercial real estate owner occupied		960,868		908,494
Commercial real estate non-owner occupied		1,443,831		1,383,150
Construction and development < 60 months		575,652		475,236
Construction residential real estate < 60 months		274,311		303,305
Residential real estate first lien		1,216,508		1,117,899
Residential real estate all other		230,397		196,198
Agriculture		425,930		408,037
Commercial non-real estate		1,296,796		1,241,454
Consumer non-real estate		475,721		446,756
Oil and gas		572,608		463,034
Total (1)	$	7,472,622	$	6,943,563
(1) Excludes accrued interest receivable of $37.8 million at September 30, 2023 and $30.6 million at December 31, 2022, 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:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Other real estate owned and repossessed assets	$	42,782	$	36,936

Summary of Rental Income and Operating Expenses

This property had the following rental income and operating expenses for the periods presented.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)
Rental income	$	2,911	$	2,437	$	8,379	$	7,750
Operating expense		2,690		2,381		8,038		7,120

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.

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Real estate:
Commercial real estate owner occupied	$	2,082	$	1,795
Commercial real estate non-owner occupied		674		667
Construction and development < 60 months		802		93
Construction residential real estate < 60 months		366		430
Residential real estate first lien		2,734		1,947
Residential real estate all other		833		55
Agriculture		2,305		2,734
Commercial non-real estate		6,465		7,066
Consumer non-real estate		332		192
Oil and gas		83		320
Total	$	16,676	$	15,299

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
(Dollars in thousands)	30-59 Days Past Due		60-89 Days Past Due		90 Days and Greater		Total Past Due Loans		Current Loans		Total Loans		Accruing Loans 90 Days or More Past Due
As of September 30, 2023
Real estate:
Commercial real estate owner occupied	$	1,490	$	671	$	6,522	$	8,683	$	952,185	$	960,868	$	4,928
Commercial real estate non-owner occupied		—		40		1,198		1,238		1,442,593		1,443,831		524
Construction and development < 60 months		9,161		—		1,186		10,347		565,305		575,652		384
Construction residential real estate < 60 months		424		97		543		1,064		273,247		274,311		543
Residential real estate first lien		3,104		543		2,877		6,524		1,209,984		1,216,508		1,120
Residential real estate all other		647		252		861		1,760		228,637		230,397		100
Agriculture		3,413		380		3,925		7,718		418,212		425,930		3,166
Commercial non-real estate		3,439		1,226		5,589		10,254		1,286,542		1,296,796		1,323
Consumer non-real estate		2,322		635		462		3,419		472,302		475,721		353
Oil and gas		115		—		217		332		572,276		572,608		134
Total	$	24,115	$	3,844	$	23,380	$	51,339	$	7,421,283	$	7,472,622	$	12,575
	30-59 Days Past Due		60-89 Days Past Due		90 Days and Greater		Total Past Due Loans		Current Loans		Total Loans		Accruing Loans 90 Days or More Past Due
As of December 31, 2022
Real estate:
Commercial real estate owner occupied	$	1,314	$	1,524	$	4,580	$	7,418	$	901,076	$	908,494	$	4,580
Commercial real estate non-owner occupied		6,237		—		42		6,279		1,376,871		1,383,150		43
Construction and development < 60 months		535		40		114		689		474,547		475,236		81
Construction residential real estate < 60 months		1,320		282		148		1,750		301,555		303,305		—
Residential real estate first lien		3,415		1,076		844		5,335		1,112,564		1,117,899		349
Residential real estate all other		265		37		185		487		195,711		196,198		166
Agriculture		2,357		34		2,265		4,656		403,381		408,037		1,054
Commercial non-real estate		2,490		2,142		2,772		7,404		1,234,050		1,241,454		345
Consumer non-real estate		2,591		648		585		3,824		442,932		446,756		467
Oil and gas		654		—		—		654		462,380		463,034		—
Total	$	21,178	$	5,783	$	11,535	$	38,496	$	6,905,067	$	6,943,563	$	7,085

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)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
As of September 30, 2023
Commercial real estate owner occupied
Grade 1	$	99,990	$	155,460	$	120,444	$	87,838	$	82,081	$	139,298	$	23,622	$	708,733
Grade 2		29,812		57,975		37,289		23,581		21,509		30,107		34,361		234,634
Grade 3		142		3,582		4,304		652		1,899		1,075		2,437		14,091
Grade 4		27		159		200		850		665		1,020		150		3,071
Grade 5		—		—		—		—		339		—		—		339
Total commercial real estate owner occupied		129,971		217,176		162,237		112,921		106,493		171,500		60,570		960,868
Commercial real estate non-owner occupied
Grade 1	$	160,303	$	255,862	$	176,995	$	122,636	$	59,973	$	72,918	$	47,780	$	896,467
Grade 2		74,860		155,293		81,452		53,753		62,989		73,789		28,722		530,858
Grade 3		—		6,736		1,717		149		6,207		299		—		15,108
Grade 4		200		632		—		—		—		566		—		1,398
Total commercial real estate non-owner occupied		235,363		418,523		260,164		176,538		129,169		147,572		76,502		1,443,831
Construction and development < 60 months
Grade 1	$	91,548	$	123,068	$	73,070	$	8,484	$	6,842	$	5,403	$	61,474	$	369,889
Grade 2		59,837		50,514		33,168		6,629		13,572		2,381		34,350		200,451
Grade 3		3,308		893		102		97		—		7		—		4,407
Grade 4		—		903		—		—		—		2		—		905
Total construction and development < 60 months		154,693		175,378		106,340		15,210		20,414		7,793		95,824		575,652
Construction residential real estate < 60 months
Grade 1	$	136,871	$	36,431	$	1,441	$	102	$	2	$	37	$	37,179	$	212,063
Grade 2		44,707		9,530		32		22		—		382		549		55,222
Grade 3		5,730		387		—		—		—		—		—		6,117
Grade 4		366		543		—		—		—		—		—		909
Total construction residential real estate < 60 months		187,674		46,891		1,473		124		2		419		37,728		274,311
Residential real estate first lien
Grade 1	$	223,552	$	238,614	$	177,122	$	121,747	$	74,016	$	155,802	$	2,918	$	993,771
Grade 2		41,655		40,971		39,280		25,018		13,617		43,460		—		204,001
Grade 3		2,282		1,902		2,626		1,327		1,606		4,202		—		13,945
Grade 4		384		172		1,246		346		440		2,203		—		4,791
Total residential real estate first lien		267,873		281,659		220,274		148,438		89,679		205,667		2,918		1,216,508
Residential real estate all other
Grade 1	$	35,422	$	27,339	$	8,166	$	8,242	$	3,963	$	13,045	$	41,474	$	137,651
Grade 2		2,828		5,088		2,210		1,958		1,546		3,272		71,527		88,429
Grade 3		416		353		74		42		41		440		1,925		3,291
Grade 4		—		24		—		—		95		45		862		1,026
Total residential real estate all other		38,666		32,804		10,450		10,242		5,645		16,802		115,788		230,397
Agriculture
Grade 1	$	47,552	$	55,420	$	35,685	$	29,284	$	17,863	$	33,652	$	39,462	$	258,918
Grade 2		28,366		24,237		19,989		10,303		9,369		17,304		35,554		145,122
Grade 3		8,891		856		854		3,433		323		2,696		2,896		19,949
Grade 4		41		901		217		134		384		244		20		1,941
Total Agriculture		84,850		81,414		56,745		43,154		27,939		53,896		77,932		425,930
Commercial non-real estate
Grade 1	$	204,828	$	186,934	$	167,915	$	40,328	$	39,003	$	39,326	$	281,116	$	959,450
Grade 2		80,383		43,067		25,617		15,244		10,064		9,171		137,965		321,511
Grade 3		1,840		3,149		1,073		163		563		1,103		2,648		10,539
Grade 4		1,038		1,408		304		690		309		129		1,154		5,032
Grade 5		—		—		—		—		264		—		—		264
Total commercial non-real estate		288,089		234,558		194,909		56,425		50,203		49,729		422,883		1,296,796
Consumer non-real estate
Grade 1	$	175,483	$	123,675	$	64,280	$	22,331	$	10,804	$	3,518	$	24,688	$	424,779
Grade 2		15,347		16,509		7,792		2,502		809		1,614		1,764		46,337
Grade 3		562		1,198		957		325		285		155		12		3,494
Grade 4		123		402		384		103		85		12		2		1,111
Total consumer non-real estate		191,515		141,784		73,413		25,261		11,983		5,299		26,466		475,721
Oil and gas
Grade 1	$	157,820	$	26,772	$	52,090	$	9,850	$	1,630	$	16,141	$	170,256	$	434,559
Grade 2		41,447		7,180		1,999		414		306		217		83,009		134,572
Grade 3		134		1,922		413		2		13		167		743		3,394
Grade 4		—		83		—		—		—		—		—		83
Total oil and gas		199,401		35,957		54,502		10,266		1,949		16,525		254,008		572,608
Total loans held for investment	$	1,778,095	$	1,666,144	$	1,140,507	$	598,579	$	443,476	$	675,202	$	1,170,619	$	7,472,622

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
(Dollars in thousands)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
Three months ended September 30, 2023
Commercial real estate owner occupied
Current-period gross charge-offs	$	174	$	189	$	25	$	112	$	147	$	158	$	—	$	805
Commercial real estate non-owner occupied
Current-period gross charge-offs		—		—		—		—		—		—		—		—
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		—		—		71		11		—		18		—		100
Residential real estate all other
Current-period gross charge-offs		—		—		—		—		—		—		—		—
Agriculture
Current-period gross charge-offs		—		150		9		—		—		—		—		159
Commercial non-real estate
Current-period gross charge-offs		19		15		46		—		51		108		—		239
Consumer non-real estate
Current-period gross charge-offs		192		146		56		12		1		18		2		427
Oil and gas
Current-period gross charge-offs		—		—		—		—		—		—		—		—
Total current-period gross charge-offs	$	385	$	500	$	207	$	135	$	199	$	302	$	2	$	1,730

	Term Loans Amortized Cost Basis by Origination Year												Revolving Loans
(Dollars in thousands)	2023		2022		2021		2020		2019		Prior		Amortized Cost Basis		Total
Nine months ended September 30, 2023
Commercial real estate owner occupied
Current-period gross charge-offs	$	174	$	196	$	26	$	134	$	165	$	158	$	—	$	853
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		—		—		90		32		—		22		—		144
Residential real estate all other
Current-period gross charge-offs		—		4		19		—		1		4		—		28
Agriculture
Current-period gross charge-offs		—		154		9		317		14		2		—		496
Commercial non-real estate
Current-period gross charge-offs		61		116		109		20		51		160		—		517
Consumer non-real estate
Current-period gross charge-offs		221		408		203		41		38		35		19		965
Oil and gas
Current-period gross charge-offs		—		2		—		—		—		—		—		2
Total current-period gross charge-offs	$	456	$	882	$	456	$	546	$	269	$	384	$	19	$	3,012

Activity in Allowance for Credit Losses on Loans

The following table details 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 beginning of period		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Three Months Ended September 30, 2023
Real estate:
Commercial real estate owner occupied	$	6,808	$	(805	)	$	3	$	(802	)	$	809		$	6,815
Commercial real estate non-owner occupied		33,432		—			—		—			1,182			34,614
Construction and development < 60 months		3,440		—			3		3			467			3,910
Construction residential real estate < 60 months		3,553		—			—		—			(9	)		3,544
Residential real estate first lien		4,755		(100	)		—		(100	)		109			4,764
Residential real estate all other		1,661		—			1		1			3			1,665
Agriculture		6,426		(159	)		—		(159	)		166			6,433
Commercial non-real estate		25,127		(239	)		243		4			(886	)		24,245
Consumer non-real estate		4,344		(427	)		24		(403	)		448			4,389
Oil and gas		7,374		—			—		—			23			7,397
Total	$	96,920	$	(1,730	)	$	274	$	(1,456	)	$	2,312		$	97,776

	Allowance for Credit Losses
	Balance at beginning of period		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Nine Months Ended September 30, 2023
Real estate:
Commercial real estate owner occupied	$	6,416	$	(853	)	$	55	$	(798	)	$	1,197		$	6,815
Commercial real estate non-owner occupied		30,190		(3	)		—		(3	)		4,427			34,614
Construction and development < 60 months		3,778		(4	)		9		5			127			3,910
Construction residential real estate < 60 months		3,275		—			—		—			269			3,544
Residential real estate first lien		4,092		(144	)		13		(131	)		803			4,764
Residential real estate all other		1,418		(28	)		4		(24	)		271			1,665
Agriculture		6,217		(496	)		13		(483	)		699			6,433
Commercial non-real estate		25,106		(517	)		392		(125	)		(736	)		24,245
Consumer non-real estate		4,132		(965	)		116		(849	)		1,106			4,389
Oil and gas		8,104		(2	)		—		(2	)		(705	)		7,397
Total	$	92,728	$	(3,012	)	$	602	$	(2,410	)	$	7,458		$	97,776

	Allowance for Credit Losses
	Balance at beginning of period		Initial allowance on loans purchased with credit deterioration			Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Three Months Ended September 30, 2022
Real estate:
Commercial real estate owner occupied	$	6,928	$	—		$	—		$	426	$	426		$	(231	)	$	7,123
Commercial real estate non-owner occupied		16,315		—			—			—		—			7,371			23,686
Construction and development < 60 months		3,680		—			—			3		3			461			4,144
Construction residential real estate < 60 months		1,183		—			—			—		—			1,124			2,307
Residential real estate first lien		3,355		—			(11	)		15		4			(18	)		3,341
Residential real estate all other		1,480		—			(2	)		1		(1	)		84			1,563
Agriculture		7,956		—			(80	)		1		(79	)		629			8,506
Commercial non-real estate		25,370		(4	)		(187	)		26		(161	)		(251	)		24,954
Consumer non-real estate		4,050		(3	)		(171	)		59		(112	)		270			4,205
Oil and gas		16,618		—			—			—		—			(6,576	)		10,042
Total	$	86,935	$	(7	)	$	(451	)	$	531	$	80		$	2,863		$	89,871

	Allowance for Credit Losses
	Balance at beginning of period		Initial allowance on loans purchased with credit deterioration		Charge- offs			Recoveries		Net charge-offs			Provision for/(benefit from) credit losses on loans			Balance at end of period
	(Dollars in thousands)
Nine Months Ended September 30, 2022
Real estate:
Commercial real estate owner occupied	$	7,550	$	—	$	(20	)	$	504	$	484		$	(911	)	$	7,123
Commercial real estate non-owner occupied		16,807		—		—			—		—			6,879			23,686
Construction and development < 60 months		3,454		—		—			8		8			682			4,144
Construction residential real estate < 60 months		1,051		—		—			—		—			1,256			2,307
Residential real estate first lien		3,048		2		(60	)		28		(32	)		323			3,341
Residential real estate all other		1,567		—		(38	)		403		365			(369	)		1,563
Agriculture		8,392		—		(205	)		8		(197	)		311			8,506
Commercial non-real estate		25,565		44		(961	)		162		(799	)		144			24,954
Consumer non-real estate		3,694		25		(404	)		139		(265	)		751			4,205
Oil and gas		12,808		—		—			—		—			(2,766	)		10,042
Total	$	83,936	$	71	$	(1,688	)	$	1,252	$	(436	)	$	6,300		$	89,871

Purchased Credit Deteriorated Loans

The Company has 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 nine month period ended September 30, 2023. The credit-deteriorated loans purchased during the nine months ended September 30, 2022 were as follows:

	Loans acquired with deteriorated credit quality
	(Dollars in thousands)
For the period ended September 30, 2022
Purchase price of loans at acquisition	$	661
Allowance for credit losses at acquisition		71
Par value of acquired loans at acquisition	$	732

Collateral-Dependent Gross Loans Held for Investment by Collateral Type and Related Specific Allocation

The following table summarizes collateral-dependent gross loans held for investment by collateral type and the related specific allocation as follows:

	Collateral Type
	Real Estate		Business Assets		Energy Reserves		Other Assets		Total		Specific Allocation
	(Dollars in thousands)
As of September 30, 2023
Real estate:
Commercial real estate owner occupied	$	—	$	—	$	—	$	—	$	—	$	—
Commercial real estate non-owner occupied		632		—		—		—		632		250
Construction and development < 60 months		—		—		—		—		—		—
Construction residential real estate < 60 months		366		—		—		—		366		45
Residential real estate first lien		214		—		—		—		214		65
Residential real estate all other		57		—		—		—		57		60
Agriculture		3,191		603		—		3,039		6,833		2,586
Commercial non-real estate		—		4,902		—		37		4,939		1,229
Consumer non-real estate		—		14		—		79		93		65
Oil and gas		—		—		—		—		—		—
Total collateral-dependent loans held for investment	$	4,460	$	5,519	$	—	$	3,155	$	13,134	$	4,300
	Collateral Type
	Real Estate		Business Assets		Energy Reserves		Other Assets		Total		Specific Allocation
	(Dollars in thousands)
As of December 31, 2022
Real estate:
Commercial real estate owner occupied	$	2,213	$	—	$	—	$	—	$	2,213	$	870
Commercial real estate non-owner occupied		1,263		—		—		—		1,263		333
Construction and development < 60 months		—		—		—		—		—		—
Construction residential real estate < 60 months		420		—		—		—		420		45
Residential real estate first lien		481		—		—		—		481		207
Residential real estate all other		9		—		—		—		9		9
Agriculture		3,447		701		—		3,592		7,740		3,114
Commercial non-real estate		—		5,924		—		4		5,928		1,938
Consumer non-real estate		—		—		—		117		117		81
Oil and gas		—		—		—		—		—		—
Total collateral-dependent loans held for investment	$	7,833	$	6,625	$	—	$	3,713	$	18,171	$	6,597

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:

	Nine Months Ended September 30,
	2023		2022
	(Dollars in thousands)
Other real estate owned	$	2,236	$	4,393
Repossessed assets		1,448		696
Total	$	3,684	$	5,089

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Intangible Assets and Goodwill (Tables)

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

The following is a summary of intangible assets as of the date listed:

	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(Dollars in thousands)
September 30, 2023
Core deposit intangibles	$	33,550	$	(16,170	)	$	17,380
Customer relationship intangibles		3,350		(3,139	)		211
Total	$	36,900	$	(19,309	)	$	17,591
December 31, 2022
Core deposit intangibles	$	33,298	$	(13,615	)	$	19,683
Customer relationship intangibles		3,350		(3,050	)		300
Total	$	36,648	$	(16,665	)	$	19,983

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)
Nine months ended September 30, 2023
Balance at beginning of period	$	13,767	$	61,212	$	68,855	$	32,133	$	5,464	$	624	$	182,055
Acquisitions		—		208		—		—		—		—		208
Balance at end of period	$	13,767	$	61,420	$	68,855	$	32,133	$	5,464	$	624	$	182,263

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

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
Nine Months Ended September 30, 2023
Nonvested at December 31, 2022		—
Granted		9,075	$	96.39
Nonvested at September 30, 2023		9,075

Summary of Accumulated Stock Units

A summary of the accumulated stock units is as follows:

	September 30,		December 31,
	2023		2022
Accumulated stock units		117,499		129,609
Average price	$	39.20	$	34.91

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)
Nine Months Ended September 30, 2023
Outstanding at December 31, 2022		1,310,290		$	52.51
Exercised		(48,399	)		33.34
Canceled, forfeited, or expired		(8,500	)		87.97
Outstanding at September 30, 2023		1,253,391			53.01	9.94 Yrs.	$	42,268
Exercisable at September 30, 2023		502,891			33.32	6.43 Yrs.	$	26,857

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Total intrinsic value of options exercised	$	176	$	5,638	$	2,507	$	14,581
Cash received from options exercised		75		2,285		1,614		6,577
Tax benefit realized from options exercised		43		1,355		603		3,505

Assumptions Used for Computing Stock-Based Compensation Expense

The following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented:

	Nine Months Ended September 30,
	2023		2022
Weighted average grant-date fair value per share of options granted	$	—	$	30.72
Risk-free interest rate		—	1.75 to 3.25%
Dividend yield		—	2.00%
Stock price volatility		—	34.61 to 34.85%
Expected term		—	10 Yrs

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Stock-based compensation expense	$	864	$	627	$	2,077	$	1,545
Tax benefit		208		151		500		372
Stock-based compensation expense, net of tax	$	656	$	476	$	1,577	$	1,173

The Company will continue to amortize the unearned stock-based compensation expense over the remaining weighted average vesting period of approximately 5 years for unvested stock options and 6 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

	September 30, 2023
	(Dollars in thousands)
Unearned stock-based compensation expense for unvested stock options	$	10,957
Unearned stock-based compensation expense for unvested RSUs		850

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Summary of Shares Repurchased Under Stock Purchase Program

The following table is a summary of the shares purchased under the program during the period indicated and the shares remaining to be repurchased in the program:

	For the Nine Months Ended September 30,
	2023		2022
Number of shares repurchased		20,702		—
Average price of shares repurchased	$	87.88	$	—
Shares remaining to be repurchased		479,784		500,486

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 September 30, 2023:
Total Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,430,965	16.90%	$	677,482	8.00%	$	889,196	10.50%	N/A		N/A
BancFirst		1,189,612	16.36%		581,616	8.00%		763,371	10.50%	$	727,020	10.00%
Pegasus		143,898	18.16%		63,389	8.00%		83,199	10.50%		79,237	10.00%
Worthington		50,731	12.92%		31,401	8.00%		41,214	10.50%		39,251	10.00%
Common Equity Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,247,907	14.74%	$	381,084	4.50%	$	592,797	7.00%	N/A		N/A
BancFirst		1,083,583	14.90%		327,159	4.50%		508,914	7.00%	$	472,563	6.50%
Pegasus		135,463	17.10%		35,657	4.50%		55,466	7.00%		51,504	6.50%
Worthington		46,814	11.93%		17,663	4.50%		27,476	7.00%		25,513	6.50%
Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	1,273,907	15.04%	$	508,112	6.00%	$	719,825	8.50%	N/A		N/A
BancFirst		1,103,583	15.18%		436,212	6.00%		617,967	8.50%	$	581,616	8.00%
Pegasus		135,463	17.10%		47,542	6.00%		67,351	8.50%		63,389	8.00%
Worthington		46,814	11.93%		23,551	6.00%		33,363	8.50%		31,401	8.00%
Tier 1 Capital
(to Quarterly Average Assets)-
BancFirst Corporation	$	1,273,907	10.70%	$	476,200	4.00%	N/A		N/A	N/A		N/A
BancFirst		1,103,583	10.85%		406,769	4.00%	N/A		N/A	$	508,461	5.00%
Pegasus		135,463	11.26%		48,117	4.00%	N/A		N/A		60,146	5.00%
Worthington		46,814	8.88%		21,086	4.00%	N/A		N/A		26,358	5.00%

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Net Income Per Common Share (Tables)

9 Months Ended

Sep. 30, 2023

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands, except per share data)
(Numerator)
Income available to common stockholders	$	50,988	$	55,352	$	163,531	$	135,974
(Denominator)
Weighted average shares outstanding for basic earnings per common share		32,937,149		32,825,931		32,916,996		32,748,116
Dilutive effect of stock compensation		602,240		710,627		576,019		681,045
Weighted-average shares outstanding for diluted earnings per common share		33,539,389		33,536,558		33,493,015		33,429,161
Basic earnings per share	$	1.55	$	1.69	$	4.97	$	4.15
Diluted earnings per share	$	1.52	$	1.65	$	4.88	$	4.07

Average Exercise Price of Options And RSUs Excluded from Computation of Diluted Net Income Per Common Share

The following table shows the number of options and RSUs 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 September 30, 2023		263,176
Three Months Ended September 30, 2022		184,707
Nine Months Ended September 30, 2023		278,828
Nine Months Ended September 30, 2022		149,669

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2023

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)
September 30, 2023
Debt securities available for sale:
U.S. Treasury	$	1,468,204	$	—	$	—	$	1,468,204
U.S. federal agencies		—		12,580		—		12,580
Mortgage-backed securities		—		14,412		—		14,412
States and political subdivisions		—		9,502		429		9,931
Asset backed securities		—		12,411		—		12,411
Other debt securities		—		6,718		—		6,718
Derivative assets		—		21,686		—		21,686
Derivative liabilities		—		19,558		—		19,558
December 31, 2022
Debt securities available for sale:
U.S. Treasury	$	1,477,864	$	—	$	—	$	1,477,864
U.S. federal agencies		—		15,222		—		15,222
Mortgage-backed securities		—		16,586		—		16,586
States and political subdivisions		—		7,680		454		8,134
Asset backed securities		—		13,010		—		13,010
Other debt securities				7,405				7,405
Derivative assets		—		20,745		—		20,745
Derivative liabilities		—		19,683		—		19,683

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:

	Nine Months Ended September 30,			Twelve Months Ended December 31,
	2023			2022
	(Dollars in thousands)
Balance at the beginning of the year	$	454		$	320
Purchases		—			255
Settlements		(30	)		(110	)
Total unrealized gain		5			(11	)
Balance at the end of the period	$	429		$	454

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 September 30, 2023
Equity securities	$	14,827
Collateral dependent loans		363
Repossessed assets		348
Other real estate owned		6,453
As of and for the Year-to-date Period Ended December 31, 2022
Equity securities	$	15,512
Collateral dependent loans		1,618
Repossessed assets		180
Other real estate owned		34,999

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:

	September 30, 2023				December 31, 2022
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Dollars in thousands)
FINANCIAL ASSETS
Level 2 inputs:
Cash and cash equivalents	$	2,336,761	$	2,336,761	$	3,168,910	$	3,168,910
Federal funds sold		6,875		6,875		2,850		2,850
Debt securities held for investment		7		7		13		13
Loans held for sale		3,852		3,852		6,232		6,232
Level 3 inputs:
Debt securities held for investment		1,185		1,185		2,370		2,370
Loans, net of allowance for credit losses		7,374,846		7,065,173		6,850,835		6,563,755
FINANCIAL LIABILITIES
Level 2 inputs:
Deposits		10,534,171		10,098,240		10,974,228		10,614,840
Short-term borrowings		3,976		3,976		300		300
Subordinated debt		86,086		76,771		86,044		82,385
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments				4,714				4,598
Letters of credit				589				542

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

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:

		September 30, 2023						December 31, 2022
Oil and Natural Gas Swaps and Options	Notional Units	Notional Amount			Estimated Fair Value			Notional Amount			Estimated Fair Value
		(Notional amounts and dollars in thousands)
Oil
Derivative assets	Barrels		4,041		$	12,352			2,698		$	8,868
Derivative liabilities	Barrels		(4,041	)		(11,204	)		(2,698	)		(8,259	)
Gas/Natural Gas Liquids
Derivative assets	MMBTUs/Gallons		54,266			9,334			25,059			11,877
Derivative liabilities	MMBTUs/Gallons		(54,266	)		(8,354	)		(25,059	)		(11,424	)
Total Fair Value	Included in
Derivative assets	Other assets					21,686						20,745
Derivative liabilities	Other liabilities					(19,558	)					(19,683	)

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 September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(Dollars in thousands)				(Dollars in thousands)
Derivative income	$	115	$	118	$	464	$	406

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:

	September 30, 2023		December 31, 2022
	(Dollars in thousands)
Credit exposure	$	—	$	6,560

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2023

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 Banks		BancFirst Community Banks		Pegasus		Worthington		Other Financial Services		Executive, Operations & Support			Eliminations			Consolidated
	(Dollars in thousands)
Three Months Ended September 30, 2023
Net interest income	$	30,258	$	56,644	$	11,334	$	4,160	$	1,063	$	849		$	—		$	104,308
Noninterest income		5,533		15,986		561		301		14,542		59,923			(52,397	)		44,449
Income before taxes		22,043		38,985		6,559		693		5,541		43,282			(51,873	)		65,230
Three Months Ended September 30, 2022
Net interest income	$	26,022	$	55,782	$	13,815	$	4,723	$	1,604	$	(999	)	$	—		$	100,947
Noninterest income		8,722		18,764		246		305		14,106		62,969			(55,781	)		49,331
Income before taxes		22,827		41,179		8,178		2,109		6,222		43,180			(55,358	)		68,337
Nine Months Ended September 30, 2023
Net interest income	$	90,266	$	171,946	$	39,994	$	12,907	$	3,063	$	1,214		$	—		$	319,390
Noninterest income		18,710		55,504		1,242		835		41,064		189,754			(166,858	)		140,251
Income before taxes		66,941		125,768		26,060		3,114		16,003		137,624			(165,969	)		209,541
Nine Months Ended September 30, 2022
Net interest income	$	67,592	$	149,965	$	31,399	$	10,160	$	6,596	$	(2,411	)	$	20		$	263,321
Noninterest income		23,999		53,761		730		724		37,842		158,299			(139,776	)		135,579
Income before taxes		56,140		108,980		15,677		3,930		16,910		104,729			(139,073	)		167,293
Total Assets:
September 30, 2023	$	3,533,334	$	6,929,256	$	1,308,938	$	574,929	$	62,118	$	1,212,338		$	(1,506,311	)	$	12,114,602
December 31, 2022		3,412,369		6,886,066		1,404,033		541,002		171,679		1,473,443			(1,500,729	)		12,387,863

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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2023 USD ($)
ASU 2022-02 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2023
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU 2023-02 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2023
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Unfunded LIHTC commitments	$ 21,800,000
Amortization of NMTC investments	$ 977,000

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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail)	Jul. 20, 2023 USD ($)	Feb. 08, 2022 USD ($) Location	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Combination Separately Recognized Transactions [Line Items]
Total assets			$ 12,114,602,000	$ 12,387,863,000
Loans held for investment (net of unearned interest)			7,472,622,000	6,943,563,000
Deposits			10,534,171,000	10,974,228,000
Goodwill			$ 182,263,000	$ 182,055,000
RCB Bank [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total assets	$ 2,500,000
Loans held for investment (net of unearned interest)	2,100,000
Deposits	10,800,000
Proceeds from acquisition	7,800,000
Intangibles assets, net	252,280
Goodwill	$ 208,752
Worthington [Member]
Business Combination Separately Recognized Transactions [Line Items]
Purchase price		$ 77,700,000
Total assets		478,000,000
Loans held for investment (net of unearned interest)		257,000,000
Deposits		430,000,000
Intangibles assets, net		5,900,000
Goodwill		$ 32,100,000
Worthington [Member] | Arlington, Texas [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location		1
Worthington [Member] | Colleyville, Texas [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location		1
Worthington [Member] | Fort Worth, Texas [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location		2

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Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,192	$ 2,383
Estimated Fair Value	1,192	2,383
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	7	13
Estimated Fair Value	7	13
States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	685	1,870
Estimated Fair Value	685	1,870
Other Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	500	500
Estimated Fair Value	$ 500	$ 500

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Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,625,305	$ 1,631,891
Gross Unrealized Gains	168	254
Gross Unrealized Losses	(101,217)	(93,924)
Estimated Fair Value	1,524,256	1,538,221
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,564,934	1,568,563
Gross Unrealized Losses	(96,730)	(90,699)
Estimated Fair Value	1,468,204	1,477,864
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,427	15,025
Gross Unrealized Gains	156	198
Gross Unrealized Losses	(3)	(1)
Estimated Fair Value	12,580	15,222
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,877	18,449
Gross Unrealized Gains	7	21
Gross Unrealized Losses	(2,472)	(1,884)
Estimated Fair Value	14,412	16,586
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,115	8,320
Gross Unrealized Gains	5	35
Gross Unrealized Losses	(189)	(221)
Estimated Fair Value	9,931	8,134
Asset backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,789	13,371
Gross Unrealized Losses	(378)	(361)
Estimated Fair Value	12,411	13,010
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,163	8,163
Gross Unrealized Losses	(1,445)	(758)
Estimated Fair Value	$ 6,718	$ 7,405

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Securities - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-Sale [Line Items]
Sale of low yielding securities		$ 226,000,000
Debt securities. average yield percentage		0.16%
Reinvested in debt securities		$ 220,000,000
Reinvested debt securities, average yield percentage		1.86%
Proceeds from sales of available for sale securities	$ 0	$ 222,474,000
Avaliable for sale of debt securities realized gains or losses	$ 0

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Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 350	$ 1,186
Amortized cost, After one year but within five years	841	1,195
Amortized cost, After five years but within ten years	1	2
Amortized Cost	1,192	2,383
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	208,397	101,607
Amortized Cost, After one year but within five years	1,317,661	1,316,874
Amortized Cost, After five years but within ten years	60,974	170,513
Amortized Cost, After ten years	38,273	42,897
Amortized Cost	1,625,305	1,631,891
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	350	1,186
Estimated Fair Value, After one year but within five years	841	1,195
Estimated Fair Value, After five years but within ten years	1	2
Estimated Fair Value	1,192	2,383
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	203,774	100,655
Estimated Fair Value, After one year but within five years	1,228,720	1,233,725
Estimated Fair Value, After five years but within ten years	56,159	163,101
Estimated Fair Value, After ten years	35,603	40,740
Total debt securities	$ 1,524,256	$ 1,538,221

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Securities - Company's Book Value of Pledged Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]
Book value of pledged securities			$ 220,000
Asset Pledged as Collateral without Right [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Book value of pledged securities	$ 542,516	$ 573,952

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Securities - Schedule of Proceeds from Sales and Realized Losses on Available for Sale Sebt Securities (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 0	$ 222,474,000
Gross losses realized		$ 3,990,000

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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands	Sep. 30, 2023 USD ($) Investments	Dec. 31, 2022 USD ($) Investments
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	170	179
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 97,531	$ 818,115
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	2,770	29,153
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,408,140	698,341
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	98,447	64,771
Available-for-sale Securities, Fair Value, Total	1,505,671	1,516,456
Available-for-sale Securities, Unrealized Losses, Total	$ 101,217	$ 93,924
U.S. Treasuries [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	71	74
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 93,372	$ 787,925
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	2,708	27,078
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,374,832	689,939
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	94,022	63,621
Available-for-sale Securities, Fair Value, Total	1,468,204	1,477,864
Available-for-sale Securities, Unrealized Losses, Total	$ 96,730	$ 90,699
U.S. Federal Agencies [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	3	1
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,260
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	3
Available-for-sale Securities, 12 Months or Longer, Fair Value		$ 349
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses		1
Available-for-sale Securities, Fair Value, Total	1,260	349
Available-for-sale Securities, Unrealized Losses, Total	$ 3	$ 1
Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	83	92
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,242	$ 10,001
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	38	1,239
Available-for-sale Securities, 12 Months or Longer, Fair Value	12,887	5,055
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	2,434	645
Available-for-sale Securities, Fair Value, Total	14,129	15,056
Available-for-sale Securities, Unrealized Losses, Total	$ 2,472	$ 1,884
States and Political Subdivisions [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	9	8
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 1,657	$ 2,308
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	21	184
Available-for-sale Securities, 12 Months or Longer, Fair Value	1,292	464
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	168	37
Available-for-sale Securities, Fair Value, Total	2,949	2,772
Available-for-sale Securities, Unrealized Losses, Total	$ 189	$ 221
Asset backed Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	1	1
Available-for-sale Securities, Less than 12 Months, Fair Value		$ 13,010
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		361
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 12,411
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	378
Available-for-sale Securities, Fair Value, Total	12,411	13,010
Available-for-sale Securities, Unrealized Losses, Total	$ 378	$ 361
Other Securities [Member]
Debt Securities, Available-for-Sale [Abstract]
Number of investments | Investments	3	3
Available-for-sale Securities, Less than 12 Months, Fair Value		$ 4,871
Available-for-sale Securities, Less than 12 Months, Unrealized Losses		291
Available-for-sale Securities, 12 Months or Longer, Fair Value	$ 6,718	2,534
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	1,445	467
Available-for-sale Securities, Fair Value, Total	6,718	7,405
Available-for-sale Securities, Unrealized Losses, Total	$ 1,445	$ 758

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Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	$ 7,472,622	$ 6,943,563
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)	960,868	908,494
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)	1,443,831	1,383,150
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)	575,652	475,236
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)	274,311	303,305
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)	1,216,508	1,117,899
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)	230,397	196,198
Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	425,930	408,037
Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	1,296,796	1,241,454
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	475,721	446,756
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	$ 572,608	$ 463,034

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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	Sep. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Accrued interest receivable	$ 37.8	$ 30.6

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Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Gains (losses) on sale of property held in other real estate owned	$ 342,000	$ 4,000,000
Interest income recognized on nonaccrual loans	0	0
Nonaccrual loans with no related allowance for credit losses	0		$ 0
Balance of modifies loans	8,400,000
Interest income that would have been recognized	1,100,000	$ 992,000
U.S. Federal Agencies [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans guaranteed by government agencies	5,700,000		4,700,000
Other Real Estate Owned [Member] | Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Other real estate	$ 32,700,000		$ 29,400,000
Parent Company [Member]
Financing Receivable Recorded Investment [Line Items]
Percentage of loans secured by real estate	69.00%
BancFirst [Member]
Financing Receivable Recorded Investment [Line Items]
Loan percentage	85.00%
Pegasus and Worthington [Member]
Financing Receivable Recorded Investment [Line Items]
Loan percentage	15.00%

XML

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Other Real Estate Owned and Repossessed Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Summary Of Nonperforming And Restructured Assets [Abstract]
Other real estate owned and repossessed assets	$ 42,782	$ 36,936

XML

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Rental Income and Operating Expenses (Details) - Real Estate Investment [Member] - Commercial Real Estate [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Rental income	$ 2,911	$ 2,437	$ 8,379	$ 7,750
Operating expense	$ 2,690	$ 2,381	$ 8,038	$ 7,120

XML

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	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 16,676	$ 15,299
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	2,082	1,795
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	674	667
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	802	93
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	366	430
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	2,734	1,947
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	833	55
Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	2,305	2,734
Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	6,465	7,066
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	332	192
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 83	$ 320

XML

Loans Held for Investment and Allowance for Credit Losses on Loans - Age Analysis of Loans Held for Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 7,472,622	$ 6,943,563
Accruing Loans 90 Days or More Past Due	12,575	7,085
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	960,868	908,494
Accruing Loans 90 Days or More Past Due	4,928	4,580
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,443,831	1,383,150
Accruing Loans 90 Days or More Past Due	524	43
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	575,652	475,236
Accruing Loans 90 Days or More Past Due	384	81
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	274,311	303,305
Accruing Loans 90 Days or More Past Due	543
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,216,508	1,117,899
Accruing Loans 90 Days or More Past Due	1,120	349
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	230,397	196,198
Accruing Loans 90 Days or More Past Due	100	166
Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	425,930	408,037
Accruing Loans 90 Days or More Past Due	3,166	1,054
Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,296,796	1,241,454
Accruing Loans 90 Days or More Past Due	1,323	345
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	475,721	446,756
Accruing Loans 90 Days or More Past Due	353	467
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	572,608	463,034
Accruing Loans 90 Days or More Past Due	134
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	24,115	21,178
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	1,490	1,314
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		6,237
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	9,161	535
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	424	1,320
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	3,104	3,415
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	647	265
30 to 59 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,413	2,357
30 to 59 Days Past Due [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,439	2,490
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,322	2,591
30 to 59 Days Past Due [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	115	654
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,844	5,783
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	671	1,524
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	40
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		40
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	97	282
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	543	1,076
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	252	37
60 to 89 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	380	34
60 to 89 Days Past Due [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,226	2,142
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	635	648
90 Days and Greater [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	23,380	11,535
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	6,522	4,580
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	1,198	42
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	1,186	114
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	543	148
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	2,877	844
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	861	185
90 Days and Greater [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,925	2,265
90 Days and Greater [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,589	2,772
90 Days and Greater [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	462	585
90 Days and Greater [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	217
Past Due Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	51,339	38,496
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	8,683	7,418
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	1,238	6,279
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	10,347	689
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	1,064	1,750
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	6,524	5,335
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	1,760	487
Past Due Loans [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	7,718	4,656
Past Due Loans [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	10,254	7,404
Past Due Loans [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,419	3,824
Past Due Loans [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	332	654
Current Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	7,421,283	6,905,067
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	952,185	901,076
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	1,442,593	1,376,871
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	565,305	474,547
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	273,247	301,555
Current Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,209,984	1,112,564
Current Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	228,637	195,711
Current Loans [Member] | Real Estate [Member] | Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	418,212	403,381
Current Loans [Member] | Commercial Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,286,542	1,234,050
Current Loans [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	472,302	442,932
Current Loans [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 572,276	$ 462,380

XML

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	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	$ 1,778,095
Fiscal year before current fiscal year	1,666,144
Two years before current fiscal year	1,140,507
Three years before current fiscal year	598,579
Four years before current fiscal year	443,476
Prior	675,202
Revolving Loans Amortized Cost Basis	1,170,619
Total loans	7,472,622	$ 6,943,563
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	129,971
Fiscal year before current fiscal year	217,176
Two years before current fiscal year	162,237
Three years before current fiscal year	112,921
Four years before current fiscal year	106,493
Prior	171,500
Revolving Loans Amortized Cost Basis	60,570
Total loans	960,868	908,494
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	99,990
Fiscal year before current fiscal year	155,460
Two years before current fiscal year	120,444
Three years before current fiscal year	87,838
Four years before current fiscal year	82,081
Prior	139,298
Revolving Loans Amortized Cost Basis	23,622
Total loans	708,733
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	29,812
Fiscal year before current fiscal year	57,975
Two years before current fiscal year	37,289
Three years before current fiscal year	23,581
Four years before current fiscal year	21,509
Prior	30,107
Revolving Loans Amortized Cost Basis	34,361
Total loans	234,634
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	142
Fiscal year before current fiscal year	3,582
Two years before current fiscal year	4,304
Three years before current fiscal year	652
Four years before current fiscal year	1,899
Prior	1,075
Revolving Loans Amortized Cost Basis	2,437
Total loans	14,091
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	27
Fiscal year before current fiscal year	159
Two years before current fiscal year	200
Three years before current fiscal year	850
Four years before current fiscal year	665
Prior	1,020
Revolving Loans Amortized Cost Basis	150
Total loans	3,071
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
Four years before current fiscal year	339
Total loans	339
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	235,363
Fiscal year before current fiscal year	418,523
Two years before current fiscal year	260,164
Three years before current fiscal year	176,538
Four years before current fiscal year	129,169
Prior	147,572
Revolving Loans Amortized Cost Basis	76,502
Total loans	1,443,831	1,383,150
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	160,303
Fiscal year before current fiscal year	255,862
Two years before current fiscal year	176,995
Three years before current fiscal year	122,636
Four years before current fiscal year	59,973
Prior	72,918
Revolving Loans Amortized Cost Basis	47,780
Total loans	896,467
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	74,860
Fiscal year before current fiscal year	155,293
Two years before current fiscal year	81,452
Three years before current fiscal year	53,753
Four years before current fiscal year	62,989
Prior	73,789
Revolving Loans Amortized Cost Basis	28,722
Total loans	530,858
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	6,736
Two years before current fiscal year	1,717
Three years before current fiscal year	149
Four years before current fiscal year	6,207
Prior	299
Total loans	15,108
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	200
Fiscal year before current fiscal year	632
Prior	566
Total loans	1,398
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	154,693
Fiscal year before current fiscal year	175,378
Two years before current fiscal year	106,340
Three years before current fiscal year	15,210
Four years before current fiscal year	20,414
Prior	7,793
Revolving Loans Amortized Cost Basis	95,824
Total loans	575,652	475,236
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	91,548
Fiscal year before current fiscal year	123,068
Two years before current fiscal year	73,070
Three years before current fiscal year	8,484
Four years before current fiscal year	6,842
Prior	5,403
Revolving Loans Amortized Cost Basis	61,474
Total loans	369,889
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	59,837
Fiscal year before current fiscal year	50,514
Two years before current fiscal year	33,168
Three years before current fiscal year	6,629
Four years before current fiscal year	13,572
Prior	2,381
Revolving Loans Amortized Cost Basis	34,350
Total loans	200,451
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	3,308
Fiscal year before current fiscal year	893
Two years before current fiscal year	102
Three years before current fiscal year	97
Prior	7
Total loans	4,407
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	903
Prior	2
Total loans	905
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	187,674
Fiscal year before current fiscal year	46,891
Two years before current fiscal year	1,473
Three years before current fiscal year	124
Four years before current fiscal year	2
Prior	419
Revolving Loans Amortized Cost Basis	37,728
Total loans	274,311	303,305
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	136,871
Fiscal year before current fiscal year	36,431
Two years before current fiscal year	1,441
Three years before current fiscal year	102
Four years before current fiscal year	2
Prior	37
Revolving Loans Amortized Cost Basis	37,179
Total loans	212,063
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	44,707
Fiscal year before current fiscal year	9,530
Two years before current fiscal year	32
Three years before current fiscal year	22
Prior	382
Revolving Loans Amortized Cost Basis	549
Total loans	55,222
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	5,730
Fiscal year before current fiscal year	387
Total loans	6,117
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	366
Fiscal year before current fiscal year	543
Total loans	909
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	267,873
Fiscal year before current fiscal year	281,659
Two years before current fiscal year	220,274
Three years before current fiscal year	148,438
Four years before current fiscal year	89,679
Prior	205,667
Revolving Loans Amortized Cost Basis	2,918
Total loans	1,216,508	1,117,899
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	223,552
Fiscal year before current fiscal year	238,614
Two years before current fiscal year	177,122
Three years before current fiscal year	121,747
Four years before current fiscal year	74,016
Prior	155,802
Revolving Loans Amortized Cost Basis	2,918
Total loans	993,771
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	41,655
Fiscal year before current fiscal year	40,971
Two years before current fiscal year	39,280
Three years before current fiscal year	25,018
Four years before current fiscal year	13,617
Prior	43,460
Total loans	204,001
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	2,282
Fiscal year before current fiscal year	1,902
Two years before current fiscal year	2,626
Three years before current fiscal year	1,327
Four years before current fiscal year	1,606
Prior	4,202
Total loans	13,945
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	384
Fiscal year before current fiscal year	172
Two years before current fiscal year	1,246
Three years before current fiscal year	346
Four years before current fiscal year	440
Prior	2,203
Total loans	4,791
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	38,666
Fiscal year before current fiscal year	32,804
Two years before current fiscal year	10,450
Three years before current fiscal year	10,242
Four years before current fiscal year	5,645
Prior	16,802
Revolving Loans Amortized Cost Basis	115,788
Total loans	230,397	196,198
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	35,422
Fiscal year before current fiscal year	27,339
Two years before current fiscal year	8,166
Three years before current fiscal year	8,242
Four years before current fiscal year	3,963
Prior	13,045
Revolving Loans Amortized Cost Basis	41,474
Total loans	137,651
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	2,828
Fiscal year before current fiscal year	5,088
Two years before current fiscal year	2,210
Three years before current fiscal year	1,958
Four years before current fiscal year	1,546
Prior	3,272
Revolving Loans Amortized Cost Basis	71,527
Total loans	88,429
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	416
Fiscal year before current fiscal year	353
Two years before current fiscal year	74
Three years before current fiscal year	42
Four years before current fiscal year	41
Prior	440
Revolving Loans Amortized Cost Basis	1,925
Total loans	3,291
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	24
Four years before current fiscal year	95
Prior	45
Revolving Loans Amortized Cost Basis	862
Total loans	1,026
Real Estate [Member] | Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	84,850
Fiscal year before current fiscal year	81,414
Two years before current fiscal year	56,745
Three years before current fiscal year	43,154
Four years before current fiscal year	27,939
Prior	53,896
Revolving Loans Amortized Cost Basis	77,932
Total loans	425,930	408,037
Real Estate [Member] | Agriculture [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	47,552
Fiscal year before current fiscal year	55,420
Two years before current fiscal year	35,685
Three years before current fiscal year	29,284
Four years before current fiscal year	17,863
Prior	33,652
Revolving Loans Amortized Cost Basis	39,462
Total loans	258,918
Real Estate [Member] | Agriculture [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	28,366
Fiscal year before current fiscal year	24,237
Two years before current fiscal year	19,989
Three years before current fiscal year	10,303
Four years before current fiscal year	9,369
Prior	17,304
Revolving Loans Amortized Cost Basis	35,554
Total loans	145,122
Real Estate [Member] | Agriculture [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	8,891
Fiscal year before current fiscal year	856
Two years before current fiscal year	854
Three years before current fiscal year	3,433
Four years before current fiscal year	323
Prior	2,696
Revolving Loans Amortized Cost Basis	2,896
Total loans	19,949
Real Estate [Member] | Agriculture [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	41
Fiscal year before current fiscal year	901
Two years before current fiscal year	217
Three years before current fiscal year	134
Four years before current fiscal year	384
Prior	244
Revolving Loans Amortized Cost Basis	20
Total loans	1,941
Commercial Non-real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	288,089
Fiscal year before current fiscal year	234,558
Two years before current fiscal year	194,909
Three years before current fiscal year	56,425
Four years before current fiscal year	50,203
Prior	49,729
Revolving Loans Amortized Cost Basis	422,883
Total loans	1,296,796	1,241,454
Commercial Non-real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	204,828
Fiscal year before current fiscal year	186,934
Two years before current fiscal year	167,915
Three years before current fiscal year	40,328
Four years before current fiscal year	39,003
Prior	39,326
Revolving Loans Amortized Cost Basis	281,116
Total loans	959,450
Commercial Non-real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	80,383
Fiscal year before current fiscal year	43,067
Two years before current fiscal year	25,617
Three years before current fiscal year	15,244
Four years before current fiscal year	10,064
Prior	9,171
Revolving Loans Amortized Cost Basis	137,965
Total loans	321,511
Commercial Non-real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,840
Fiscal year before current fiscal year	3,149
Two years before current fiscal year	1,073
Three years before current fiscal year	163
Four years before current fiscal year	563
Prior	1,103
Revolving Loans Amortized Cost Basis	2,648
Total loans	10,539
Commercial Non-real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,038
Fiscal year before current fiscal year	1,408
Two years before current fiscal year	304
Three years before current fiscal year	690
Four years before current fiscal year	309
Prior	129
Revolving Loans Amortized Cost Basis	1,154
Total loans	5,032
Commercial Non-real Estate [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
Four years before current fiscal year	264
Total loans	264
Consumer Non-real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	191,515
Fiscal year before current fiscal year	141,784
Two years before current fiscal year	73,413
Three years before current fiscal year	25,261
Four years before current fiscal year	11,983
Prior	5,299
Revolving Loans Amortized Cost Basis	26,466
Total loans	475,721	446,756
Consumer Non-real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	175,483
Fiscal year before current fiscal year	123,675
Two years before current fiscal year	64,280
Three years before current fiscal year	22,331
Four years before current fiscal year	10,804
Prior	3,518
Revolving Loans Amortized Cost Basis	24,688
Total loans	424,779
Consumer Non-real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	15,347
Fiscal year before current fiscal year	16,509
Two years before current fiscal year	7,792
Three years before current fiscal year	2,502
Four years before current fiscal year	809
Prior	1,614
Revolving Loans Amortized Cost Basis	1,764
Total loans	46,337
Consumer Non-real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	562
Fiscal year before current fiscal year	1,198
Two years before current fiscal year	957
Three years before current fiscal year	325
Four years before current fiscal year	285
Prior	155
Revolving Loans Amortized Cost Basis	12
Total loans	3,494
Consumer Non-real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	123
Fiscal year before current fiscal year	402
Two years before current fiscal year	384
Three years before current fiscal year	103
Four years before current fiscal year	85
Prior	12
Revolving Loans Amortized Cost Basis	2
Total loans	1,111
Oil and Gas [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	199,401
Fiscal year before current fiscal year	35,957
Two years before current fiscal year	54,502
Three years before current fiscal year	10,266
Four years before current fiscal year	1,949
Prior	16,525
Revolving Loans Amortized Cost Basis	254,008
Total loans	572,608	$ 463,034
Oil and Gas [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	157,820
Fiscal year before current fiscal year	26,772
Two years before current fiscal year	52,090
Three years before current fiscal year	9,850
Four years before current fiscal year	1,630
Prior	16,141
Revolving Loans Amortized Cost Basis	170,256
Total loans	434,559
Oil and Gas [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	41,447
Fiscal year before current fiscal year	7,180
Two years before current fiscal year	1,999
Three years before current fiscal year	414
Four years before current fiscal year	306
Prior	217
Revolving Loans Amortized Cost Basis	83,009
Total loans	134,572
Oil and Gas [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	134
Fiscal year before current fiscal year	1,922
Two years before current fiscal year	413
Three years before current fiscal year	2
Four years before current fiscal year	13
Prior	167
Revolving Loans Amortized Cost Basis	743
Total loans	3,394
Oil and Gas [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	83
Total loans	$ 83

XML

Loans Held for Investment and Allowance for Credit Losses on Loans - Gross Charges-offs by Year of Orgination (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	$ 385	$ 456
Fiscal year before current fiscal year gross charge-offs	500	882
Two years before current fiscal year gross charge-offs	207	456
Three years before current fiscal year gross charge-offs	135	546
Four years before current fiscal year gross charge-offs	199	269
Prior gross charge-offs	302	384
Revolving Loans Amortized Cost Basis gross charge-offs	2	19
Total current-period gross charge-offs	1,730	3,012
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	174	174
Fiscal year before current fiscal year gross charge-offs	189	196
Two years before current fiscal year gross charge-offs	25	26
Three years before current fiscal year gross charge-offs	112	134
Four years before current fiscal year gross charge-offs	147	165
Prior gross charge-offs	158	158
Total current-period gross charge-offs	805	853
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior gross charge-offs		3
Total current-period gross charge-offs		3
Real Estate [Member] | Construction and Development Less than 60 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
Prior gross charge-offs
Total current-period gross charge-offs		4
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Two years before current fiscal year gross charge-offs	71	90
Three years before current fiscal year gross charge-offs	11	32
Prior gross charge-offs	18	22
Total current-period gross charge-offs	100	144
Real Estate [Member] | Residential Real Estate All Other [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		19
Four years before current fiscal year gross charge-offs		1
Prior gross charge-offs		4
Total current-period gross charge-offs		28
Real Estate [Member] | Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs	150	154
Two years before current fiscal year gross charge-offs	9	9
Three years before current fiscal year gross charge-offs		317
Four years before current fiscal year gross charge-offs		14
Prior gross charge-offs		2
Total current-period gross charge-offs	159	496
Commercial Non-real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	19	61
Fiscal year before current fiscal year gross charge-offs	15	116
Two years before current fiscal year gross charge-offs	46	109
Three years before current fiscal year gross charge-offs		20
Four years before current fiscal year gross charge-offs	51	51
Prior gross charge-offs	108	160
Total current-period gross charge-offs	239	517
Consumer Non-real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year gross charge-offs	192	221
Fiscal year before current fiscal year gross charge-offs	146	408
Two years before current fiscal year gross charge-offs	56	203
Three years before current fiscal year gross charge-offs	12	41
Four years before current fiscal year gross charge-offs	1	38
Prior gross charge-offs	18	35
Revolving Loans Amortized Cost Basis gross charge-offs	2	19
Total current-period gross charge-offs	$ 427	965
Oil and Gas [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Fiscal year before current fiscal year gross charge-offs		2
Total current-period gross charge-offs		$ 2

XML

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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	$ 96,920	$ 86,935	$ 92,728	$ 83,936
Initial allowance on loans purchased with credit deterioration		(7)		71
Charge- offs	(1,730)	(451)	(3,012)	(1,688)
Recoveries	274	531	602	1,252
Net charge-offs	(1,456)	80	(2,410)	(436)
Provision for/(benefit from) credit losses	2,312	2,863	7,458	6,300
Balance at end of period	97,776	89,871	97,776	89,871
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	6,808	6,928	6,416	7,550
Charge- offs	(805)		(853)	(20)
Recoveries	3	426	55	504
Net charge-offs	(802)	426	(798)	484
Provision for/(benefit from) credit losses	809	(231)	1,197	(911)
Balance at end of period	6,815	7,123	6,815	7,123
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	33,432	16,315	30,190	16,807
Charge- offs			(3)
Net charge-offs			(3)
Provision for/(benefit from) credit losses	1,182	7,371	4,427	6,879
Balance at end of period	34,614	23,686	34,614	23,686
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	3,440	3,680	3,778	3,454
Charge- offs			(4)
Recoveries	3	3	9	8
Net charge-offs	3	3	5	8
Provision for/(benefit from) credit losses	467	461	127	682
Balance at end of period	3,910	4,144	3,910	4,144
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	3,553	1,183	3,275	1,051
Provision for/(benefit from) credit losses	(9)	1,124	269	1,256
Balance at end of period	3,544	2,307	3,544	2,307
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	4,755	3,355	4,092	3,048
Initial allowance on loans purchased with credit deterioration				2
Charge- offs	(100)	(11)	(144)	(60)
Recoveries		15	13	28
Net charge-offs	(100)	4	(131)	(32)
Provision for/(benefit from) credit losses	109	(18)	803	323
Balance at end of period	4,764	3,341	4,764	3,341
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	1,661	1,480	1,418	1,567
Charge- offs		(2)	(28)	(38)
Recoveries	1	1	4	403
Net charge-offs	1	(1)	(24)	365
Provision for/(benefit from) credit losses	3	84	271	(369)
Balance at end of period	1,665	1,563	1,665	1,563
Commercial Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	25,127	25,370	25,106	25,565
Initial allowance on loans purchased with credit deterioration		(4)		44
Charge- offs	(239)	(187)	(517)	(961)
Recoveries	243	26	392	162
Net charge-offs	4	(161)	(125)	(799)
Provision for/(benefit from) credit losses	(886)	(251)	(736)	144
Balance at end of period	24,245	24,954	24,245	24,954
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	4,344	4,050	4,132	3,694
Initial allowance on loans purchased with credit deterioration		(3)		25
Charge- offs	(427)	(171)	(965)	(404)
Recoveries	24	59	116	139
Net charge-offs	(403)	(112)	(849)	(265)
Provision for/(benefit from) credit losses	448	270	1,106	751
Balance at end of period	4,389	4,205	4,389	4,205
Oil and Gas [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	7,374	16,618	8,104	12,808
Charge- offs			(2)
Net charge-offs			(2)
Provision for/(benefit from) credit losses	23	(6,576)	(705)	(2,766)
Balance at end of period	7,397	10,042	7,397	10,042
Agriculture [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	6,426	7,956	6,217	8,392
Charge- offs	(159)	(80)	(496)	(205)
Recoveries		1	13	8
Net charge-offs	(159)	(79)	(483)	(197)
Provision for/(benefit from) credit losses	166	629	699	311
Balance at end of period	$ 6,433	$ 8,506	$ 6,433	$ 8,506

XML

Loans Held for Investment and Allowance for Credit Losses on Loans - Purchased Credit Deteriorated Loans (Detail) - Loans Acquired with Deteriorated Credit Quality [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Purchase price of loans at acquisition	$ 661
Allowance for credit losses at acquisition	71
Par value of acquired loans at acquisition	$ 732

XML

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	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	$ 13,134		$ 18,171
Specific Allocation	97,776	$ 96,920	92,728	$ 89,871	$ 86,935	$ 83,936
Real Estate Asset [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	4,460		7,833
Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	5,519		6,625
Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	3,155		3,713
Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	4,300		6,597
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans			2,213
Specific Allocation	6,815	6,808	6,416	7,123	6,928	7,550
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	632		1,263
Specific Allocation	34,614	33,432	30,190	23,686	16,315	16,807
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	366		420
Specific Allocation	3,544	3,553	3,275	2,307	1,183	1,051
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	214		481
Specific Allocation	4,764	4,755	4,092	3,341	3,355	3,048
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	57		9
Specific Allocation	1,665	1,661	1,418	1,563	1,480	1,567
Real Estate [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	6,833		7,740
Real Estate [Member] | Real Estate Asset [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans			2,213
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	632		1,263
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	366		420
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	214		481
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	57		9
Real Estate [Member] | Real Estate Asset [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	3,191		3,447
Real Estate [Member] | Business Assets [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	603		701
Real Estate [Member] | Other Assets [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	3,039		3,592
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation			870
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	250		333
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	45		45
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	65		207
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	60		9
Real Estate [Member] | Specific Allocation [Member] | Agriculture [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	2,586		3,114
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans			5,928
Commercial and Agricultural Non-Real Estate [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans			5,924
Commercial and Agricultural Non-Real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans			4
Commercial and Agricultural Non-Real Estate [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation			1,938
Commercial Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	4,939
Specific Allocation	24,245	25,127	25,106	24,954	25,370	25,565
Commercial Non-real Estate [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	4,902
Commercial Non-real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	37
Commercial Non-real Estate [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	1,229
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	93		117
Specific Allocation	4,389	$ 4,344	4,132	$ 4,205	$ 4,050	$ 3,694
Consumer Non-real Estate [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	14
Consumer Non-real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	79		117
Consumer Non-real Estate [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Specific Allocation	$ 65		$ 81

XML

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	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Noncash Investing and Financing Items [Abstract]
Other real estate owned	$ 2,236	$ 4,393
Repossessed assets	1,448	696
Total	$ 3,684	$ 5,089

XML

Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,900	$ 36,648
Accumulated Amortization	(19,309)	(16,665)
Net Carrying Amount	17,591	19,983
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,550	33,298
Accumulated Amortization	(16,170)	(13,615)
Net Carrying Amount	17,380	19,683
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,350	3,350
Accumulated Amortization	(3,139)	(3,050)
Net Carrying Amount	$ 211	$ 300

XML

Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 182,055
Acquisitions	208
Balance at end of period	182,263
BancFirst Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	13,767
Balance at end of period	13,767
BancFirst Community Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	61,212
Acquisitions	208
Balance at end of period	61,420
Pegasus [Member]
Goodwill [Line Items]
Balance at beginning of period	68,855
Balance at end of period	68,855
Worthington [Member]
Goodwill [Line Items]
Balance at beginning of period	32,133
Balance at end of period	32,133
Other Financial Services [Member]
Goodwill [Line Items]
Balance at beginning of period	5,464
Balance at end of period	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at beginning of period	624
Balance at end of period	$ 624

XML

Subordinated Debt - Additional Information (Detail) - USD ($)		1 Months Ended		9 Months Ended
	Jun. 17, 2021	Mar. 31, 2004	Feb. 29, 2004	Sep. 30, 2023
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	$ 60,000,000
Net proceeds from sale of notes	59,150,000
Commissions and offering expenses	$ 850,000
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				100.00%
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 will 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				$ 26,800,000
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		$ 1,000,000	$ 25,000,000
Cumulative trust preferred securities interest rate				7.20%

XML

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands			9 Months Ended
	Jun. 01, 2023	May 25, 2023	Sep. 30, 2023	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted			0
Net cash settlement for stock options, cost			$ 0	$ 0
Deferred board fees percentage for stock units accumulation			100.00%
RSU's Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares for future grants		490,925
Option exercisable rate		20.00%
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] | Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option plan termination date	Jun. 01, 2023
Option exercisable rate			25.00%
Option exercisable period			4 years
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			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			25.00%
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, 2024
Number of shares available for future issuance under deferred compensation plan			20,262
Number of shares of common stock distributed			18,136	16,684

XML

Stock-Based Compensation - Summary of Activity Under RSU Plan (Details)	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Share-Based Payment Arrangement [Abstract]
Restricted Stock Units, Granted	9,075
Restricted Stock Units, Nonvested Ending Balance	9,075
Weightage Average Grant Date Fair Value, Granted | $ / shares	$ 96.39

XML

Stock-Based Compensation - Summary of Accumulated Stock Units (Detail) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Accumulated stock units	117,499	129,609
Average price	$ 39.2	$ 34.91

XML

Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Share-Based Payment Arrangement [Abstract]
Outstanding at beginning period - Options | shares	1,310,290
Options exercised | shares	(48,399)
Options canceled, forfeited, or expired | shares	(8,500)
Outstanding at ending period - Options | shares	1,253,391
Exercisable at ending period - Options | shares	502,891
Outstanding at beginning period - Wgtd. Avg. Exercise Price | $ / shares	$ 52.51
Options exercised - Wgtd. Avg. Exercise Price | $ / shares	33.34
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price | $ / shares	87.97
Outstanding at ending period - Wgtd. Avg. Exercise Price | $ / shares	53.01
Exercisable at ending period - Wgtd. Avg. Exercise Price | $ / shares	$ 33.32
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	9 years 11 months 8 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	6 years 5 months 4 days
Outstanding at ending period - Aggregate Intrinsic Value | $	$ 42,268
Exercisable at ending period - Aggregate Intrinsic Value | $	$ 26,857

XML

Stock-Based Compensation - Options Exercised Under Stock Option Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of options exercised	$ 176	$ 5,638	$ 2,507	$ 14,581
Cash received from options exercised	75	2,285	1,614	6,577
Tax benefit realized from options exercised	$ 43	$ 1,355	$ 603	$ 3,505

XML

Stock-Based Compensation - Assumptions Used for Computing Stock-Based Compensation Expense (Detail)	9 Months Ended
	Sep. 30, 2022 $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted average grant-date fair value per share of options granted	$ 30.72
Risk-free interest rate, minimum	1.75%
Risk-free interest rate, maximum	3.25%
Dividend yield	2.00%
Stock price volatility, minimum	34.61%
Stock price volatility, maximum	34.85%
Expected term	10 years

XML

Stock-Based Compensation - Stock-Based Employee Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement Compensation Expense Items [Abstract]
Stock-based compensation expense	$ 864	$ 627	$ 2,077	$ 1,545
Tax benefit	208	151	500	372
Stock-based compensation expense, net of tax	$ 656	$ 476	$ 1,577	$ 1,173

XML

Stock-Based Compensation - Unearned Stock-based Compensation Expense (Detail) $ in Thousands	Sep. 30, 2023 USD ($)
Stock Option [Member]
Stock-Based Compensation Expense [Line Items]
Unearned stock-based compensation expense	$ 10,957
RSU's Plan [Member]
Stock-Based Compensation Expense [Line Items]
Unearned stock-based compensation expense	$ 850

XML

Stockholders' Equity - Additional Information (Detail)	Sep. 30, 2023 USD ($)
Maximum [Member]
Stockholders Equity [Line Items]
Quantitative limit for trust preferred securities to be included in tier 1 capital	$ 15,000,000,000

XML

Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Number of shares repurchased	20,702
Average price of shares repurchased	$ 87.88
Shares remaining to be repurchased	479,784	500,486

XML

Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Sep. 30, 2023 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,430,965
Total Capital To Risk Weighted Assets Actual Ratio	0.169
Capital Required For Capital Adequacy Amount	$ 677,482
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 889,196
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Common Equity Tier 1 Risk Based Capital Amount	$ 1,247,907
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1474
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 381,084
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	$ 592,797
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Tier 1 Risk Based Capital Amount	$ 1,273,907
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1504
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 508,112
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	$ 719,825
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Capital Amount	$ 1,273,907
Tier 1 Capital To Quarterly Average Assets Ratio	0.107
Tier 1 Capital Required For Capital Adequacy Amount	$ 476,200
Tier 1 Capital Required For Capital Adequacy To Quartely Average Assets Ratio	0.04
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,189,612
Total Capital To Risk Weighted Assets Actual Ratio	0.1636
Capital Required For Capital Adequacy Amount	$ 581,616
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 763,371
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 727,020
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 1,083,583
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.149
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 327,159
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	$ 508,914
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	$ 472,563
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	$ 1,103,583
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1518
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 436,212
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	$ 617,967
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	$ 581,616
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 1,103,583
Tier 1 Capital To Quarterly Average Assets Ratio	0.1085
Tier 1 Capital Required For Capital Adequacy Amount	$ 406,769
Tier 1 Capital Required For Capital Adequacy To Quartely Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 508,461
Tier 1 Capital Required To Be Well Capitalized To Quartely Average Assets Ratio	0.05
Pegasus [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 143,898
Total Capital To Risk Weighted Assets Actual Ratio	0.1816
Capital Required For Capital Adequacy Amount	$ 63,389
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 83,199
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 79,237
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 135,463
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.171
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 35,657
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	$ 55,466
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	$ 51,504
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	$ 135,463
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.171
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 47,542
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	$ 67,351
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	$ 63,389
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 135,463
Tier 1 Capital To Quarterly Average Assets Ratio	0.1126
Tier 1 Capital Required For Capital Adequacy Amount	$ 48,117
Tier 1 Capital Required For Capital Adequacy To Quartely Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 60,146
Tier 1 Capital Required To Be Well Capitalized To Quartely Average Assets Ratio	0.05
Worthington [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 50,731
Total Capital To Risk Weighted Assets Actual Ratio	0.1292
Capital Required For Capital Adequacy Amount	$ 31,401
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 41,214
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 39,251
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 46,814
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1193
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 17,663
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	$ 27,476
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	$ 25,513
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	$ 46,814
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1193
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 23,551
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	$ 33,363
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	$ 31,401
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 46,814
Tier 1 Capital To Quarterly Average Assets Ratio	0.0888
Tier 1 Capital Required For Capital Adequacy Amount	$ 21,086
Tier 1 Capital Required For Capital Adequacy To Quartely Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 26,358
Tier 1 Capital Required To Be Well Capitalized To Quartely Average Assets Ratio	0.05

XML

Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
(Numerator)
Income available to common stockholders	$ 50,988	$ 55,352	$ 163,531	$ 135,974
(Denominator)
Weighted average shares outstanding for basic earnings per common share	32,937,149	32,825,931	32,916,996	32,748,116
Dilutive effect of stock compensation	602,240	710,627	576,019	681,045
Weighted-average shares outstanding for diluted earnings per common share	33,539,389	33,536,558	33,493,015	33,429,161
Basic earnings per share	$ 1.55	$ 1.69	$ 4.97	$ 4.15
Diluted earnings per share	$ 1.52	$ 1.65	$ 4.88	$ 4.07

XML

Net Income Per Common Share - Average Exercise Prices of Options And RSUs Excluded from Computation of Diluted Net Income Per Common Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Abstract]
Shares	263,176	184,707	278,828	149,669

XML

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 1,524,256	$ 1,538,221
Derivative assets	$ 21,686	$ 20,745
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets	Interest Receivable and Other Assets
Derivative liabilities	$ 19,558	$ 19,683
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	$ 1,468,204	$ 1,477,864
U.S. Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	12,580	15,222
Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	14,412	16,586
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	9,931	8,134
Asset backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	12,411	13,010
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	6,718	7,405
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	1,468,204	1,477,864
Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	21,686	20,745
Derivative liabilities	19,558	19,683
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	12,580	15,222
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	14,412	16,586
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	9,502	7,680
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	12,411	13,010
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	6,718	7,405
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	$ 429	$ 454

XML

Fair Value Measurements - Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the year	$ 454	$ 320
Purchases		255
Settlements	(30)	(110)
Total unrealized gain	$ 5	$ (11)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Balance at the end of the period	$ 429	$ 454

XML

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Level 3 [Member] - Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 14,827	$ 15,512
Collateral Dependent Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	363	1,618
Repossessed Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	348	180
Other Real Estate Owned [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 6,453	$ 34,999

XML

Fair Value Measurements - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
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 or liabilities for which no impairment was provided	$ 0	$ 0

XML

Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
FINANCIAL ASSETS
Federal funds sold, Carrying Amount	$ 6,875	$ 2,850
Debt securities held for investment, Carrying Amount	1,192	2,383
Loans, net of allowance for credit losses, Carrying Amount	7,374,846	6,850,835
Debt securities held for investment, Fair Value	1,192	2,383
Loans held for sale, Fair Value	3,852	6,232
FINANCIAL LIABILITIES
Deposits, Carrying Amount	10,534,171	10,974,228
Short-term borrowings, Carrying Amount	3,976	300
Subordinated debt, Carrying Amount	86,086	86,044
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments, Fair Value	4,714	4,598
Letters of credit, Fair Value	589	542
Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents, Carrying Amount	2,336,761	3,168,910
Federal funds sold, Carrying Amount	6,875	2,850
Debt securities held for investment, Carrying Amount	7	13
Loans held for sale, Carrying Amount	3,852	6,232
Cash and cash equivalents, Fair Value	2,336,761	3,168,910
Federal funds sold, Fair Value	6,875	2,850
Debt securities held for investment, Fair Value	7	13
Loans held for sale, Fair Value	3,852	6,232
FINANCIAL LIABILITIES
Deposits, Carrying Amount	10,534,171	10,974,228
Short-term borrowings, Carrying Amount	3,976	300
Subordinated debt, Carrying Amount	86,086	86,044
Deposits, Fair Value	10,098,240	10,614,840
Short-term borrowings, Fair Value	3,976	300
Subordinated debt, Fair Value	76,771	82,385
Level 3 Inputs [Member]
FINANCIAL ASSETS
Debt securities held for investment, Carrying Amount	1,185	2,370
Loans, net of allowance for credit losses, Carrying Amount	7,374,846	6,850,835
Debt securities held for investment, Fair Value	1,185	2,370
Loans, net of allowance for credit losses, Fair Value	$ 7,065,173	$ 6,563,755

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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Percentage share of total profit	35.00%
Other Assets [Member] | Oil and Gas Reserves [Member]
Derivative [Line Items]
Derivative instrument margin amount	$ 22.3	$ 6.6

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Derivative Financial Instruments - Summary of Notional Amounts and Estimated Fair Values of Oil and Gas Derivative Positions Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	$ 21,686	$ 20,745
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets	Interest Receivable and Other Assets
Derivative liabilities, Estimated Fair Value	$ (19,558)	$ (19,683)
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	$ 21,686	$ 20,745
Derivative liabilities, Estimated Fair Value	(19,558)	(19,683)
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	4,041	2,698
Derivative liabilities, Notional Amount	(4,041)	(2,698)
Derivative assets, Estimated Fair Value	12,352	8,868
Derivative liabilities, Estimated Fair Value	(11,204)	(8,259)
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	54,266	25,059
Derivative liabilities, Notional Amount	(54,266)	(25,059)
Derivative assets, Estimated Fair Value	9,334	11,877
Derivative liabilities, Estimated Fair Value	$ (8,354)	$ (11,424)

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Derivative Financial Instruments - Summary of Company's Recognized Income Related to Activity Included in Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
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	$ 115	$ 118	$ 464	$ 406

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Derivative Financial Instruments - Summary of Company's Net Credit Exposure Relating to Oil and Gas Swaps and Options with Bank Counterparties (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Oil and Natural Gas Swaps and Options [Member]
Credit Derivatives [Line Items]
Credit exposure	$ 6,560

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Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2023 Business_Unit
Segment Reporting [Abstract]
Number of principal business units	6

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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net interest income	$ 104,308	$ 100,947	$ 319,390	$ 263,321
Noninterest income	44,449	49,331	140,251	135,579
Income before taxes	65,230	68,337	209,541	167,293
Total assets	12,114,602		12,114,602		$ 12,387,863
Operating Segments [Member] | BancFirst Metropolitan Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	30,258	26,022	90,266	67,592
Noninterest income	5,533	8,722	18,710	23,999
Income before taxes	22,043	22,827	66,941	56,140
Total assets	3,533,334		3,533,334		3,412,369
Operating Segments [Member] | BancFirst Community Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	56,644	55,782	171,946	149,965
Noninterest income	15,986	18,764	55,504	53,761
Income before taxes	38,985	41,179	125,768	108,980
Total assets	6,929,256		6,929,256		6,886,066
Operating Segments [Member] | Pegasus [Member]
Segment Reporting Information [Line Items]
Net interest income	11,334	13,815	39,994	31,399
Noninterest income	561	246	1,242	730
Income before taxes	6,559	8,178	26,060	15,677
Total assets	1,308,938		1,308,938		1,404,033
Operating Segments [Member] | Worthington [Member]
Segment Reporting Information [Line Items]
Net interest income	4,160	4,723	12,907	10,160
Noninterest income	301	305	835	724
Income before taxes	693	2,109	3,114	3,930
Total assets	574,929		574,929		541,002
Operating Segments [Member] | Other Financial Services [Member]
Segment Reporting Information [Line Items]
Net interest income	1,063	1,604	3,063	6,596
Noninterest income	14,542	14,106	41,064	37,842
Income before taxes	5,541	6,222	16,003	16,910
Total assets	62,118		62,118		171,679
Operating Segments [Member] | Executive, Operations & Support [Member]
Segment Reporting Information [Line Items]
Net interest income	849	(999)	1,214	(2,411)
Noninterest income	59,923	62,969	189,754	158,299
Income before taxes	43,282	43,180	137,624	104,729
Total assets	1,212,338		1,212,338		1,473,443
Eliminations [Member]
Segment Reporting Information [Line Items]
Net interest income				20
Noninterest income	(52,397)	(55,781)	(166,858)	(139,776)
Income before taxes	(51,873)	$ (55,358)	(165,969)	$ (139,073)
Total assets	$ (1,506,311)		$ (1,506,311)		$ (1,500,729)