BancFirst (BANF) 10-K 25 Feb 22 2021 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Jun. 30, 2021
Document And Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
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
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
City Area Code	405
Local Phone Number	270-1086
Document Annual Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		32,630,638
Entity Public Float			$ 1,212,712,989
Documents Incorporated by Reference	Portions of the Proxy Statement for the 2022 Annual Meeting of Stockholders of the registrant (the “2022 Proxy Statement”) to be filed pursuant to Regulation 14A are incorporated by reference into Part III of this report.
Auditor Name	BKD, LLP
Auditor Location	Oklahoma City, OK
Auditor Firm ID	686

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 228,819	$ 280,518
Interest-bearing deposits with banks	1,821,203	1,336,394
Federal funds sold	800	0
Debt securities held for investment (fair value: $2,978 and $2,984, respectively)	2,977	2,964
Debt securities available for sale	531,523	552,232
Loans held for sale	24,776	53,719
Loans held for investment (net of unearned interest)	6,169,442	6,394,506
Allowance for credit losses	(83,936)	(91,366)
Loans, net of allowance for credit losses	6,085,506	6,303,140
Premises and equipment, net	269,047	261,677
Other real estate owned	39,475	32,179
Intangible assets, net	17,566	18,999
Goodwill	149,922	149,922
Accrued interest receivable and other assets	233,998	220,613
Total assets	9,405,612	9,212,357
Deposits:
Noninterest-bearing	3,775,387	3,790,900
Interest-bearing	4,316,527	4,273,804
Total deposits	8,091,914	8,064,704
Short-term borrowings	0	1,100
Accrued interest payable and other liabilities	55,977	51,864
Subordinated debt	85,987	26,804
Total liabilities	8,233,878	8,144,472
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,603,118 and 32,719,852, respectively	32,603	32,720
Capital surplus	159,914	156,574
Retained earnings	977,067	871,161
Accumulated other comprehensive income, net of income tax of $684 and $2,513, respectively	2,150	7,430
Total stockholders' equity	1,171,734	1,067,885
Total liabilities and stockholders' equity	9,405,612	9,212,357
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities, fair value	$ 2,978	$ 2,984
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	32,603,118	32,719,852
Common stock, shares outstanding	32,603,118	32,719,852
Accumulated other comprehensive income, net of tax expense (benefit)	$ 684	$ 2,513
Senior Preferred Stock [Member]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Cumulative Preferred Stock [Member]
Preferred stock, par value	$ 5	$ 5
Preferred stock, shares authorized	900,000	900,000
Preferred stock, shares issued	0	0

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INTEREST INCOME
Loans, including fees	$ 316,124	$ 311,987	$ 291,519
Debt securities:
Taxable	6,327	8,591	13,308
Tax-exempt	204	487	458
Federal funds sold			4
Interest-bearing deposits with banks	4,366	6,049	31,368
Total interest income	327,021	327,114	336,657
INTEREST EXPENSE
Deposits	8,232	18,472	52,738
Short-term borrowings	2	8	32
Subordinated debt	3,130	1,966	1,966
Total interest expense	11,364	20,446	54,736
Net interest income	315,657	306,668	281,921
(Benefit from) provision for credit losses	(8,690)	62,648	8,287
Net interest income after provision for credit losses	324,347	244,020	273,634
NONINTEREST INCOME
Securities transactions (includes no accumulated other comprehensive income reclassifications)	1,047	(389)	812
Income from sales of loans	7,282	6,067	3,619
Insurance commissions	23,745	20,996	20,296
Cash management	12,313	15,411	16,866
Gain/(loss) on sale of other assets	2,762	130	(39)
Other	26,546	7,439	5,495
Total noninterest income	170,032	137,222	137,229
NONINTEREST EXPENSE
Salaries and employee benefits	166,723	164,727	153,024
Occupancy, net	18,483	16,421	12,704
Depreciation	16,925	14,609	12,623
Amortization of intangible assets	3,116	3,815	3,366
Data processing services	6,735	6,753	5,843
Net expense/(income) from other real estate owned	9,089	(1,531)	(785)
Marketing and business promotion	7,403	6,996	8,554
Deposit insurance	3,456	2,081	1,143
Other	54,051	43,859	44,829
Total noninterest expense	285,981	257,730	241,301
Income before taxes	208,398	123,512	169,562
Income tax expense	40,768	23,926	34,683
Net income	$ 167,630	$ 99,586	$ 134,879
NET INCOME PER COMMON SHARE
Basic	$ 5.12	$ 3.05	$ 4.13
Diluted	$ 5.03	$ 3	$ 4.05
OTHER COMPREHENSIVE GAIN/(LOSS)
Unrealized (losses)/gains on securities, net of tax of $1,829, $(1,326) and $(1,918), respectively	$ (5,280)	$ 3,976	$ 5,593
Other comprehensive (loss)/gain, net of tax of $1,829, $(1,326) and $(1,918), respectively	(5,280)	3,976	5,593
Comprehensive income	162,350	103,562	140,472
Trust Revenue [Member]
NONINTEREST INCOME
Revenue	12,912	13,130	13,599
Service Charges on Deposits [Member]
NONINTEREST INCOME
Revenue	$ 83,425	$ 74,438	$ 76,581

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Securities transactions accumulated other comprehensive income reclassifications	$ 0
Unrealized (losses)/gains on securities, net of tax	1,829	$ (1,326)	$ (1,918)
Other comprehensive (loss)/gain, net of tax	$ 1,829	$ (1,326)	$ (1,918)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	CUMULATIVE EFFECT, PERIOD OF ADOPTION, ADJUSTMENT [Member]	Common Stock [Member]	CAPITAL SURPLUS [Member]	RETAINED EARNINGS [Member]	RETAINED EARNINGS [Member]CUMULATIVE EFFECT, PERIOD OF ADOPTION, ADJUSTMENT [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME [Member]
Balance at beginning of period, Shares at Dec. 31, 2018			32,603,926
Balance at beginning of period at Dec. 31, 2018			$ 32,604	$ 149,709	$ 722,615		$ (2,139)
Shares issued for stock options, Shares			117,012
Shares issued for stock options, Value			$ 117	2,367
Net income	$ 134,879				134,879
Net change							5,593
Dividends on common stock					(40,432)
Stock-based compensation arrangements				1,277
Shares acquired and canceled, Shares			(26,670)
Shares acquired and canceled, Value			$ (27)		(1,574)
Balance at end of period, Shares at Dec. 31, 2019	32,694,268		32,694,268
Balance at end of period at Dec. 31, 2019	$ 1,004,989		$ 32,694	153,353	815,488	$ 2,270	3,454
Accounting Standards Update Extensible List		ASC 326 [Member]				ASC 326 [Member]
Shares issued for stock options, Shares			84,868
Shares issued for stock options, Value			$ 85	1,705
Net income	$ 99,586				99,586
Net change							3,976
Dividends on common stock					(43,144)
Stock-based compensation arrangements				1,516
Shares acquired and canceled, Shares			(59,284)
Shares acquired and canceled, Value			$ (59)		(3,039)
Balance at end of period, Shares at Dec. 31, 2020	32,719,852		32,719,852
Balance at end of period at Dec. 31, 2020	$ 1,067,885		$ 32,720	156,574	871,161		7,430
Shares issued for stock options, Shares			95,562
Shares issued for stock options, Value			$ 95	2,165
Net income	$ 167,630				167,630
Net change							(5,280)
Dividends on common stock					(45,752)
Net cash settlement of options				(958)	(4,521)
Stock-based compensation arrangements				2,133
Shares acquired and canceled, Shares			(212,296)
Shares acquired and canceled, Value			$ (212)		(11,451)
Balance at end of period, Shares at Dec. 31, 2021	32,603,118		32,603,118
Balance at end of period at Dec. 31, 2021	$ 1,171,734		$ 32,603	$ 159,914	$ 977,067		$ 2,150

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cumulative effect of change in accounting principle tax		$ 925
RETAINED EARNINGS [Member]
Dividend on common stock	$ 1.40	$ 1.32	$ 1.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 167,630	$ 99,586	$ 134,879
Adjustments to reconcile to net cash provided by operating activities:
(Benefit from) provision for credit losses	(8,690)	62,648	8,287
Depreciation and amortization	20,041	18,424	15,989
Net amortization of securities premiums and discounts	4,409	(94)	(4,282)
Realized securities (gains) losses	(1,047)	389	(812)
Gain on sales of loans	(7,282)	(6,067)	(3,619)
Cash receipts from the sale of loans originated for sale	369,301	415,589	238,324
Cash disbursements for loans originated for sale	(354,674)	(430,653)	(237,543)
Deferred income tax provision (benefit)	7,044	(9,491)	1,148
Gain on other assets	(3,379)	(2,345)	(1,372)
Decrease/(increase) in interest receivable	4,214	(325)	887
Decrease in interest payable	(617)	(1,641)	(17)
Amortization of stock-based compensation arrangements of subsidiaries	2,133	1,516	1,277
Excess tax benefit from stock-based compensation arrangements	(1,932)	(500)	(928)
Other, net	(7,363)	7,305	6,740
Net cash provided by operating activities	189,788	154,341	158,958
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	12,599	18,397	77,672
Net cash paid from sale of assets and liabilities, net of cash received	(13,733)
Net decrease/(increase) in federal funds sold	14,200	1,000	(1,000)
Purchases of held for investment debt securities	(845)	(1,395)	(1,010)
Purchases of available for sale debt securities	(462,304)	(605,069)	(174,090)
Proceeds from maturities, calls and paydowns of held for investment debt securities	831	561	535
Proceeds from maturities, calls and paydowns of available for sale debt securities	506,737	547,729	508,293
Purchase of equity securities	(904)	(811)	(3,966)
Proceeds from paydowns and sales of equity securities	1,459	445	2,178
Net change in loans	404,393	(798,024)	(310,053)
Purchases of premises, equipment and computer software	(27,251)	(66,446)	(27,054)
Purchase of tax credits	(7,456)	(2,200)	(29,025)
Other, net	9,305	7,820	7,867
Net cash provided by (used in) investing activities	437,031	(897,993)	50,347
FINANCING ACTIVITIES
Net change in deposits	(191,737)	536,063	274,218
Net change in short-term borrowings	(1,100)		(575)
Proceeds from long-term borrowings		3,000
Paydown of long-term borrowings		(3,000)
Issuance of common stock in connection with stock options, net	2,260	1,790	2,484
Common stock acquired	(11,663)	(3,098)	(1,601)
Proceeds from issuance of subordinated notes, net of debt issuance costs	59,150
Net cash settlement of options	(5,479)
Cash dividends paid	(45,140)	(42,472)	(39,805)
Net cash (used in) provided by financing activities	(193,709)	492,283	234,721
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	433,110	(251,369)	444,026
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,616,912	1,868,281	1,424,255
Cash, due from banks and interest-bearing deposits at the end of the period	2,050,022	1,616,912	1,868,281
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	11,993	22,056	54,602
Cash paid during the period for income taxes	30,600	26,525	30,975
Noncash investing and financing activities:
Cash consideration for acquisitions	21,000	2,861	123,457
Fair value of assets acquired in acquisitions	283,711	47,838	729,378
Liabilities assumed in acquisitions	257,915	45,040	605,921
Unpaid common stock dividends declared	$ 11,737	$ 11,125	$ 10,453

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
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 the significant accounting policies follows. Nature of Operations BancFirst Corporation is an Oklahoma business corporation and a financial holding company under federal law. It conducts virtually all of its operating activities through its principal wholly-owned subsidiary, BancFirst (“BancFirst”), an Oklahoma state-chartered bank headquartered in Oklahoma City, Oklahoma. The Company also conducts operating activities through its wholly-owned subsidiary, Pegasus Bank (“Pegasus Bank”), a Texas state-chartered bank headquartered in Dallas, Texas. BancFirst and Pegasus Bank provide a wide range of retail and commercial banking services, including: commercial, real estate, agricultural and consumer lending; depository and funds transfer services; collections; safe deposit boxes; cash management services; and other services tailored for both individual and corporate customers. BancFirst also offers trust services and acts as executor, administrator, trustee, transfer agent and in various other fiduciary capacities. Through its Technology and Operations Center, BancFirst provides item processing, research and other correspondent banking services to financial institutions and governmental units. The Company’s wholly-owned subsidiary, BancFirst Insurance Services, Inc., an independent insurance agency, offers a variety of commercial and personal insurance products. In addition, the Company’s wholly-owned subsidiary, Council Oak Partners, LLC, an Oklahoma limited liability company, engages in investing activities. Basis of Presentation The accompanying consolidated financial statements include the accounts of BancFirst Corporation, Council Oak Partners, LLC, BancFirst Insurance Services, Inc., BancFirst Risk & Insurance Company (2019 and 2020 consolidated financials include a full year of operations for BancFirst Risk & Insurance Company; however it was dissolved as of December 31, 2020), Pegasus Bank, and BancFirst and its subsidiaries. The principal operating subsidiaries of BancFirst are Council Oak Investment Corporation, Council Oak Real Estate Inc., BFTower, LLC, BFC-PNC LLC, BF Brazito, 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 consolidated financial statements. Certain amounts from 2020 and 2019 have been reclassified to conform to the 2021 presentation. These reclassifications were not material to the Company’s financial statements. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with U.S. GAAP 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 intangibles. Such estimates and assumptions may change over time and actual amounts realized may differ from those reported. Securities The Company invests in debt securities. Any sales of debt securities are for the purpose of executing the Company’s asset/liability management strategy, eliminating a perceived credit risk in a specific security or providing liquidity. Debt securities that are being held for indefinite periods of time, or that may be sold as part of the Company’s asset/liability management strategy, to provide liquidity or for other reasons, are classified as available for sale and are stated at estimated fair value. Unrealized gains or losses on debt securities available for sale are reported as a component of stockholders’ equity, net of income tax. Gains or losses from sales of debt securities are based upon the book values of the specific debt securities sold. Debt securities for which the Company has the intent and ability to hold to maturity are classified as held for investment and are stated at cost, adjusted for amortization of premiums and accretion of discounts computed under the interest method. The Company reviews its portfolio of debt securities in an unrealized loss position at least quarterly. The Company first assesses whether it intends to sell or it is more-likely-than-not that it will be required to sell the securities before recovery of the amortized cost basis. If either of these criteria is met, the securities amortized cost basis is written down to fair value as a current period expense. If either of the above criteria is not met, the Company evaluates whether the decline in fair value is the result of credit losses or other factors. In making this assessment, the Company considers, among other things, the period of time the security has been in an unrealized loss position, and performance of any underlying collateral and adverse conditions specifically related to the security. The Company does not consider the unrealized position of its debt securities to be the result of credit factors, because the decline in fair value is attributable to changes in interest rates and illiquidity, and not credit quality, and the Company does not have the intent to sell these securities and it is likely that it will not be required to sell the securities before their anticipated recovery. Therefore, the Company has not recorded an allowance for credit losses against its debt securities portfolio, as the credit risk is not material. The Company does not engage in securities trading activities. The Company invests in equity securities without readily determinable fair values and utilizes Level 3 inputs. These 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. Equity securities are reported in other assets on the balance sheet. The Company reviews its portfolio of equity securities for impairment at least quarterly. Prior to the adoption of Accounting Standards Codification ("ASC") 326, declines in the fair value of held-to-maturity and available-for-sale securities below their cost that were deemed to be other than temporary were reflected in earnings as realized losses. In estimating other-than-temporary impairment losses prior to January 1, 2020, management considered, among other things, (i) the length of time and the extent to which the fair value had been less than cost, (ii) the financial condition and near-term prospects of the issuer and (iii) the intent and our ability to retain our investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. Loans The lending function is governed by written policies and procedures, as determined by senior management and approved by the Board of Directors. The policies and procedures set the standards for lending in each major loan category by collateral type and use of loan proceeds. The objectives of these policies and procedures are to identify profitable markets, determine appropriate risk tolerance levels for each type of loan, establish limits for loan officer approval, set concentration limits, establish loan-to-value thresholds, set repayment terms and loan structure guidelines and adhere to documentation requirements. Interest rate risk is controlled by the use of variable rate provisions, the vast majority of which have a rate floor, limits on fixing rates for longer periods and the use of prepayment penalties. Loans originated within the Company are stated at the principal amount outstanding, net of unearned interest, loan fees and allowance for credit losses. Interest on all performing loans is recognized, on a simple interest basis, based upon the principal amount outstanding. See Note (5) for loan disclosures. Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts. The Company has made the accounting policy election to exclude accrued interest receivable on loans from the estimate of credit losses. Interest income is accrued on the unpaid principal balance using the simple-interest method on the daily balances of the principal amounts outstanding. Interest income on consumer and commercial loans is discontinued and placed on nonaccrual status at the time the loan is 90 days delinquent unless the loan is well secured and in process of collection. Consumer loans are charged off at 180 days past due and commercial loans are charged off to the extent principal or interest is deemed uncollectible. Past-due status is based on the contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal or interest is considered doubtful. All interest accrued but not received for loans placed on nonaccrual is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Under the cost-recovery method, interest income is not recognized until the loan balance is reduced to zero. Under the cash-basis method, interest income is recorded when the payment is received in cash. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Troubled debt restructurings are loans on which, due to the borrower’s financial difficulties, the Company has granted a concession that the Company would not otherwise consider for borrowers of similar credit quality. This may include a transfer of real estate or other assets from the borrower, a modification of loan terms, or a combination of the two. Modifications of terms that could potentially qualify as a restructuring include reduction of contractual interest rate, extension of the maturity date at a contractual interest rate lower than the current rate for new debt with similar risk, and a reduction of the face amount of debt or forgiveness of either principal or accrued interest. A loan continues to qualify as restructured until a consistent payment history or change in the borrower’s financial condition has been evidenced, generally for no less than twelve months. If the restructuring agreement specifies an interest rate at the time of the restructuring that is greater than or equal to the rate that the Company is willing to accept for a new extension of credit with comparable risk, then the loan is no longer considered a restructured loan if it is in compliance with the modified terms in calendar years after the year of restructure. Residential real estate loans are made in accordance with underwriting policies and are fully documented. Credit worthiness is assessed based on significant credit characteristics including credit history and residential and employment stability. The Company does not engage in any hybrid loan programs. In addition, the Company does not have any exposure to loans with negative amortization, interest rate carryover or discounting of the initial rates (teaser rates). An updated appraisal of the collateral is obtained when a loan is first identified as a problem loan. Appraisals are reviewed annually and are updated as needed, or are updated more frequently if significant changes are believed to have occurred in the collateral or market conditions. Appraisals of other real estate owned are also reviewed and updated consistent with this policy. When a loan deteriorates to the point that the account officer or the Loan Committee concludes it no longer represents a viable asset, it will be charged off. Similarly, any portion of a loan that is deemed to no longer be a viable asset will be charged off. A loan will not be charged off unless such action has been approved by the branch President. Acquired Loans Loans acquired through business combinations are required to be carried at fair value as of the date of the combination. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date. The methodology of allowance for credit loss recorded for these acquired loans depends on whether the acquired loans are purchase credit deteriorated or non-purchase credit deteriorated. An allowance for credit loss for non-purchase credit deteriorated loans is determined and recorded in a manner consistent with originated loans. That is, the allowance for credit loss is calculated based on the loan’s amortized cost basis (i.e., the acquisition date fair value in a business combination) and is established through a charge to provision expense at the acquisition date. An allowance for credit loss for purchase credit deteriorated loans is recorded as an adjustment to the loans, in addition to the fair value amount recorded, as of the acquisition date, and not through provision expense. The acquisition date fair value plus the allowance for credit loss equals the loans new amortized cost basis as of the acquisition date. The difference between the new amortized cost basis and the unpaid principal balance of the loan represents the non-credit purchase discount/premium recorded. The difference between the fair value of loans which do not have specific evidence of deterioration of credit quality since origination and their principal balance is recognized in interest income on a level-yield method over the life of the loans. For loans which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments (as determined by the present value of expected future cash flows), the difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” is recognized in interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as yield adjustments or as loss accruals or valuation allowances. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows are recognized as impairments. Any probable loss due to subsequent credit deterioration of the loans since acquisition is provided for in the allowance for credit losses. Purchased Credit Deteriorated (PCD) Loans The Company has purchased loans, some of which have experienced more than insignificant credit deterioration since origination. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through provision expense. 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 the 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 carried at the lower of cost or fair value. Gains or losses recognized upon the sale of the loans are determined on a specific identification basis. The Company does not sell residential mortgage loans with recourse other than obligations under standard representations and warranties or for fraud. These obligations relate to loan performance for the life of the loan. The amount of loans repurchased since the inception of the program is not considered to be material, and therefore, no reserve has been required. At December 31, 2020, loans held for sale included loans at its Hugo, Oklahoma branch that it had entered into an agreement to sell to AmeriState Bank in Atoka, Oklahoma. Allowance for Credit Losses The allowance for credit losses is a valuation account that is deducted from the loans amortized cost basis to present the net amount expected to be collected on the loans. Loans are charged off against the allowance when management believes the uncollectibility of a loan balance is confirmed. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. The allowance for credit losses is increased by provisions charged to operating expense and is reduced by net loan charge-offs. The Company considers various factors to monitor the credit risk in the loan portfolio including volume and severity of loan delinquencies, nonaccrual loans, internal grading of loans, historical loan loss experience and economic conditions. Management estimates the allowance balance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, or term as well as for changes in environmental conditions, such as the political, legal, and regulatory environment, technology and consumer preferences. Historical loss information is also adjusted for reasonable and supportable changes in national and local economic conditions, such as consumer loans 90 days past due and commercial bankruptcies. Economic conditions are forecast as "current conditions" over the forecast period. Forecast models were used to validate credit performance during the forecast period. Beyond the reasonable and supportable forecast, the economic expectation reverts to the historical average, which is determined by the weighted average life of each loan pool. If a loan is individually evaluated a specific allowance is provided, if necessary, so that the loan is reported net, at the fair value of collateral. Interest payments on collateral dependent loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis. Loans, or portions thereof, are charged off when deemed uncollectible. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist. Determining the Contractual Term Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by the Company. Troubled Debt Restructurings (TDRs) The allowance for credit loss on a TDR is measured using the same method as all other loans held for investment, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the allowance for credit loss is determined by discounting the expected future cash flows at the original interest rate of the loan. Allowance for Credit Losses on Off-Balance Sheet Credit Exposures The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on off-balance sheet credit exposures is adjusted as a provision for credit loss expense. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. Based on a low likelihood that funding will occur and the Company’s ability to manage the extension of credit to our borrowers, the allowance for credit losses on off-balance sheet credit exposure is not material. Allowance for Credit Losses on Available-for-Sale Debt Securities The Company reviews its portfolio of debt securities in an unrealized loss position at least quarterly. The Company first assesses whether it intends to sell or it is more-likely-than-not that it will be required to sell the securities before recovery of the amortized cost basis. If either of these criteria is met, the securities amortized cost basis is written down to fair value as a current period expense. If either of the above criteria is not met, the Company evaluates whether the decline in fair value is the result of credit losses or other factors. In making this assessment, the Company considers, among other things, the period of time the security has been in an unrealized loss position, and performance of any underlying collateral and adverse conditions specifically related to the security. At December 31, 2021 and December 31, 2020 approximately 95 % of the available for sale debt securities held by the Company were issued by the U.S. Treasury, or U.S. government-sponsored entities and agencies. The Company does not consider the unrealized loss position of these securities to be the result of credit factors, because the decline in fair value is attributable to changes in interest rates and illiquidity, and not credit quality, and the Company does not have the intent to sell these securities and it is likely that it will not be required to sell the securities before their anticipated recovery. Therefore, the Company has not recorded an allowance for credit losses against its debt securities portfolio, as the credit risk is not material. PPP Fee Income Policy The Paycheck Protection Program (“PPP”) , established as part of the Coronavirus Aid, Relief and Economic Security (“CARES”) Act, provides that the Small Business Administration ("SBA") will pay processing fees of up to 5 % to lenders based on the volume of the PPP loans disbursed. The fee is based on the balance of each PPP loan outstanding at the time of full disbursement. The Company had received processing fees from the SBA of approximately $ 23.8 million in 2021 and $ 30.2 million in 2020. The unamortized balance of these fees on each loan is reported on the Company's balance sheet as part of the loan balance to which it relates and is recognized over the remaining life of the loan as an adjustment of yield. The unamortized balances of these fees was approximately $ 2.0 million and $ 14.5 million for the year ended December 31, 2021 and 2020, respectively. Upon notification from the SBA of the amount of the PPP loan to be forgiven the acceleration of recognition of deferred loan fee will occur for the percentage of the loan forgiven. Nonaccrual Policy A loan is placed on nonaccrual status when, in the opinion of management, the future collectability of both interest and principal is not probable. When interest accrual is discontinued, all unpaid accrued interest is reversed. Interest income is recognized on certain of these loans on a cash basis if the full collection of the remaining principal balance is reasonably expected. Otherwise, interest income is not recognized until the principal balance is fully collected. The Company does not accrue interest on (1) any loan upon which a default of principal or interest has existed for a period of 90 days or over unless the collateral margin or guarantor support are such that full collection of principal and interest are not in doubt, and an orderly plan for collection is in process; and (2) any other loan for which it is expected full collection of principal and interest is not probable. A nonaccrual loan may be restored to an accrual status when none of its principal and interest are past due and unpaid or otherwise becomes well secured and in the process of collection and when prospects for collection of future contractual payments are no longer in doubt. With the exception of a formal debt forgiveness agreement, no loan which has had principal charged-off shall be restored to accrual status unless the charged-off principal has been recovered. Premises and Equipment Premises and equipment are stated at cost, less accumulated depreciation. Depreciation is charged to operating expense and is computed using the straight-line method over the estimated useful lives of the assets. Maintenance and repairs are charged to expense as incurred while improvements are capitalized. Premises and equipment is tested for impairment if events or changes in circumstances occur that indicate that the carrying amount of any premises and equipment may not be recoverable. Impairment losses are measured by comparing the fair values of the premises and equipment with their recorded amounts. Premises that are identified to be sold are transferred to other real estate owned at the lower of their carrying amounts or their fair values less estimated costs to sell. Any losses on premises identified to be sold are charged to operating expense. When premises and equipment are transferred to other real estate owned, sold, or otherwise retired, the cost and applicable accumulated depreciation are removed from the respective accounts and any resulting gains or losses are reported in the statement of comprehensive income. Construction in progress includes all the costs of construction associated with the building of fixed long-term assets and is included in premises and equipment, net as an asset. When construction is completed, the asset is reclassified as a building or a leasehold improvement and depreciated over its applicable useful life. Leases Certain operating leases are included as right of use lease assets in accrued interest receivable and other assets on the balance sheet and a related lease liability is included in accrued interest payable and other liabilities on the balance sheet. Right of use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. The lease liability is measured as the present value of the unpaid lease payments, and the right of use assets value is derived from the calculation of the lease liability. To calculate the discount rate for each lease, the Company uses the rate implicit in the lease if available, otherwise an appropriate Federal Home Loan Bank ("FHLB") advance borrowing rate is used that correlates with the term of the lease. Other Real Estate Owned Other real estate owned ("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. Losses arising at the time of reclassification of such properties from loans to OREO are charged directly to the allowance for credit losses. Any losses on premises identified to be sold are charged to operating expense at the time of transfer from premises to OREO. Losses from declines in value of the properties subsequent to classification as OREO are charged to operating expense. Revenues and expenses for OREO property are included in the income statement for the period in which they occur. Gross rental income for OREO is included in other non-interest income. The expenses of operating or holding OREO property are included in noninterest expense. Intangible Assets and Goodwill Core deposit intangibles are amortized on a straight-line basis over the estimated useful lives of seven to ten years and customer relationship intangibles are amortized on a straight-line basis over the estimated useful life of three to eighteen years . Goodwill is not amortized, but is evaluated at a reporting unit level at least annually for impairment, or more frequently if other indicators of impairment are present. At least annually in the fourth quarter, intangible assets are evaluated for possible impairment. Impairment losses are measured by comparing the fair values of the intangible assets with their recorded amounts. Any impairment losses are reported in the statement of comprehensive income. Advertising Costs Advertising costs are expensed as incurred. Advertising costs for the year ended December 31, 2021 were $ 3.0 million. Advertising costs for the years ended December 31, 2020 and 2019 were $ 3.3 million and $ 3.8 million, respectively. Stock-based Compensation The Company recognizes stock-based compensation as compensation expense in the statement of comprehensive income based on the fair value of the Company’s stock options on the measurement date, which, for the Company, is the date of the grant. 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. Income Taxes The Company files a consolidated income tax return with its subsidiaries. Federal and state income tax expense or benefit has been allocated to subsidiaries on a separate return basis. Deferred taxes are recognized under the balance sheet method based upon the future tax consequences of temporary differences between the carrying amounts and tax basis of assets and liabilities, using the tax rates expected to apply to taxable income in the periods when the related temporary differences are expected to be realized. Realization of deferred tax assets is dependent upon the generation of a sufficient level of future taxable income and recoverable taxes paid in prior years. Although realization is not assured, management believes it is more likely than not that all of the deferred tax assets will be realized. Earnings Per Common Share Basic earnings per common share is computed by dividing net income, less any preferred dividends requirement, by the weighted average of common shares outstanding. Diluted earnings per common share reflects the potential dilution that could occur if options, convertible securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company. Revenue Recognition In addition to lending and related activities, the Company offers various services to customers that generate revenue. Contract performance typically occurs in one year or less. Incremental costs of obtaining a contract are expensed when incurred when the amortization period is one year or less. Sales of real estate The sale of real estate property is generally recognized, along with any associated gain or loss, when control of the property transfers to the buyer. Service and transaction fees on depository accounts Customers often pay certain fees to the bank to access the cash on deposit including certain non-transactional fees such as account maintenance or dormancy fees, and certain transaction based fees such as non-sufficient funds fees, overdraft, ATM, wire transfer, or foreign exchange fees.

Recent Developments, Including

Recent Developments, Including Mergers and Acquisitions	12 Months Ended
	Dec. 31, 2021
Recent Developments Including Mergers And Acquisitions [Abstract]
Recent Developments, Including Mergers and Acquisitions	(2) RECENT DEVELOPMENTS, INCLUDING MERGERS AND ACQUISITIONS 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. See Note (11) of the Notes to Consolidated Financial Statements for a complete discussion of the Company’s subordinated debt. On May 20, 2021, the Company purchased approximately $ 284 million in total assets, which included approximately $ 195 million in loans, and assumed approximately $ 256 million in deposits and certain other obligations, from The First National Bank and Trust Company of Vinita, Oklahoma for a purchase price of approximately $ 21 million. The Company recorded a bargain purchase gain related to this purchase of approximately $ 4.8 million, which is included in other noninterest income on the statement of comprehensive income and other operating activities on the statement of cash flow. The bargain purchase gain is a noncash item on the statement of cash flow. In addition, the Company recorded expenses related to this purchase of approximately $ 4.8 million, which are included in noninterest expense. As a result of the purchase, the Company recorded a core deposit intangible of approximately $ 1.7 million. 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 First National Bank and Trust Company of Vinita was a nationally chartered bank with two banking locations in Vinita and Grove, Oklahoma. On January 22, 2021, the Company sold approximately $ 21 million in loans and approximately $ 38 million in deposits from its Hugo, Oklahoma branch to AmeriState Bank in Atoka, Oklahoma. The Company recorded a gain on the transaction of $ 2.5 million, which is included in noninterest income. On March 5, 2020 the Company purchased approximately $ 47.8 million in total assets, which included $ 22.9 million in loans, and assumed approximately $ 45.0 million in deposits and certain other obligations of The Citizens State Bank of Okemah, Oklahoma (“Citizens”) for a purchase price of $ 2.9 million. As a result of the purchase, the Company recorded a core deposit intangible of approximately $ 206,000 and goodwill of approximately $ 1.3 million. The effect of this purchase was included in the consolidated financial statements of the Company from the date of purchase forward. The purchase did not have a material effect on the Company’s consolidated financial statements. Citizens was an Oklahoma state-chartered bank with banking locations in Okemah and Paden, Oklahoma. These banking locations became branches of BancFirst.

Cash, Due from Banks, Interest-

Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold	12 Months Ended
	Dec. 31, 2021
Cash and Cash Equivalents [Abstract]
Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold	(3) CASH, DUE FROM BANKS, INTEREST-BEARING DEPOSITS AND FEDERAL FUNDS SOLD The Company maintains accounts with the Federal Reserve Bank and various other financial institutions primarily for the purpose of holding excess liquidity and clearing cash items. It may also sell federal funds to certain of these institutions on an overnight basis. At December 31, 2021 and 2020, the Company had no significant concentrations of credit risk with other financial institutions. The Company maintained vault cash and funds on deposit with the Federal Reserve Bank, which is included in the following table: December 31, 2021 2020 (Dollars in thousands) Vault cash and funds on deposit with the Federal Reserve Bank $ 1,907,482 $ 1,429,410

Securities

Securities	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Securities	(4) SECURITIES The following table summarizes the amortized cost and estimated fair values of debt securities held for investment: Amortized Gross Gross Estimated (Dollars in thousands) December 31, 2021 Mortgage backed securities (1) $ 32 $ 1 $ — $ 33 States and political subdivisions 2,445 — — 2,445 Other securities 500 — — 500 Total $ 2,977 $ 1 $ — $ 2,978 December 31, 2020 Mortgage backed securities (1) $ 59 $ 3 $ — $ 62 States and political subdivisions 2,405 18 ( 1 ) 2,422 Other securities 500 — — 500 Total $ 2,964 $ 21 $ ( 1 ) $ 2,984 The following table summarizes the amortized cost and estimated fair values of debt securities available for sale: Amortized Gross Gross Estimated (Dollars in thousands) December 31, 2021 U.S. treasuries $ 455,701 $ 3,693 $ ( 1,766 ) $ 457,628 U.S. federal agencies 21,609 335 ( 2 ) 21,942 Mortgage backed securities (1) 28,897 400 ( 14 ) 29,283 States and political subdivisions 6,128 194 ( 3 ) 6,319 Asset backed securities 13,354 3 — 13,357 Other securities 3,000 — ( 6 ) 2,994 Total $ 528,689 $ 4,625 $ ( 1,791 ) $ 531,523 December 31, 2020 U.S. treasuries $ 465,416 $ 9,820 $ — $ 475,236 U.S. federal agencies 19,697 1 ( 60 ) 19,638 Mortgage backed securities (1) 15,268 428 — 15,696 States and political subdivisions 28,571 377 — 28,948 Asset backed securities 13,337 — ( 623 ) 12,714 Total $ 542,289 $ 10,626 $ ( 683 ) $ 552,232 (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. December 31, 2021 2020 Amortized Estimated Amortized Estimated (Dollars in thousands) Held for Investment Contractual maturity of debt securities: Within one year $ 577 $ 577 $ 807 $ 809 After one year but within five years 2,396 2,397 2,091 2,110 After five years but within ten years 4 4 65 64 After ten years — — 1 1 Total $ 2,977 $ 2,978 $ 2,964 $ 2,984 Available for Sale Contractual maturity of debt securities: Within one year $ 58,478 $ 58,688 $ 339,752 $ 341,102 After one year but within five years 408,253 410,049 162,401 171,135 After five years but within ten years 10,851 11,011 3,753 3,910 After ten years 51,107 51,775 36,383 36,085 Total debt securities $ 528,689 $ 531,523 $ 542,289 $ 552,232 There were no sales of securities and therefore no proceeds from sales or realized securities losses on available for sale debt securities for the years ended December 31, 2021, 2020 and 2019, respectively. Realized gains/losses on debt and equity securities are reported as securities transactions within the noninterest income section of the consolidated statement of comprehensive income. The following table is a summary of the Company’s book value of debt securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law: December 31, 2021 2020 (Dollars in thousands) Book value of pledged securities $ 473,026 $ 490,833 The following table summarizes debt securities with unrealized losses, segregated by the duration of the unrealized loss, at December 31, 2021 and 2020 respectively: Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) December 31, 2021 Available for Sale U.S. treasuries $ 298,080 $ 1,766 $ — $ — $ 298,080 $ 1,766 U.S. federal agencies 376 2 — — 376 2 Mortgage backed securities 2,824 14 — — 2,824 14 States and political subdivisions 505 3 — — 505 3 Other securities 2,994 6 — — 2,994 6 Total $ 304,779 $ 1,791 $ — $ — $ 304,779 $ 1,791 December 31, 2020 Held for Investment States and political subdivisions $ 119 $ 1 $ — $ — $ 119 $ 1 Total $ 119 $ 1 $ — $ — $ 119 $ 1 Available for Sale U.S. federal agencies $ 12,236 $ 41 $ 2,184 $ 19 $ 14,420 $ 60 Asset backed securities — — 12,714 623 12,714 623 Total $ 12,236 $ 41 $ 14,898 $ 642 $ 27,134 $ 683 Management 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 December 31, 2021 and 2020, 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. Management has no intent or requirement to sell before the recovery of the unrealized loss; therefore, no significant impairment loss was realized in the Company’s consolidated statement of comprehensive income.

Loans Held for Investment and A

Loans Held for Investment and Allowance for Credit Losses on Loans	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Loans Held for Investment and Allowance for Credit Losses on Loans	(5) LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES ON LOANS Certain loan segments were reclassified during the year. Each loan segment is made up of loan categories possessing similar risk characteristics. The Company’s re-alignment of the segments primarily consisted of reclassifying energy related loans that were previously included in consumer-related and commercial-related loans to the oil and gas categories. Management believes this accurately represents the risk profile of each loan segment. The prior period amounts have been revised to conform to the current period presentation. These reclassifications did not have a significant impact on the allowance for credit losses. Loans held for investment are summarized by portfolio segment as follows: December 31, 2021 2020 Amount Amount (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 684,739 $ 659,762 Commercial real estate non-owner occupied 1,095,324 1,050,739 Construction and development < 60 months 415,466 275,096 Construction residential real estate < 60 months 254,524 230,193 Residential real estate first lien 937,006 930,576 Residential real estate all other 161,018 172,883 Farmland 272,179 254,330 Commercial and agricultural non-real estate 1,256,487 1,193,719 Consumer non-real estate 413,370 376,264 Oil and gas 428,908 428,866 Other loans (2) 250,421 822,078 Total loans (1) $ 6,169,442 $ 6,394,506 (1) Excludes accrued interest receivable of $ 21.0 million at December 31, 2021 and $ 26.0 million at December 31, 2020, that is recorded in accrued interest receivable and other assets. (2) Includes PPP loans held for investment of $ 80.4 million, net of unamortized processing fees of $ 2.0 million at December 31, 2021 and $ 652.7 million, net of unamortized processing fees of $ 14.5 million at December 31, 2020. The Company's loans are mostly to customers within Oklahoma and approximately 62 % of 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 allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist. In connection with our adoption of ASC 326, changes were made to our primary portfolio segments to align with the methodology applied in determining the allowance for credit losses with and expected loss methodology ("CECL"). The Company has identified the following portfolio segments, which includes the applicable weighted average remaining life, and measures the allowance for credit losses using the vintage loss analysis adjusted for qualitative factors: Portfolio Segments Life (in years) Real estate: Commercial real estate owner occupied 8 Commercial real estate non-owner occupied 6 Construction and development < 60 months 3 Construction residential real estate < 60 months 1 Residential real estate first lien 13 Residential real estate all other 7 Farmland 12 Commercial and agricultural non-real estate 3 Consumer non-real estate 4 Oil and gas 2 Other loans 10 These portfolio segments are separately identified because they exhibit distinctive risk characteristics, such as financial asset types, loan purpose, collateral, and industry of the borrower. A summary of our primary portfolio segments is as follows: Commercial real estate owner occupied. Commercial real estate owner occupied are nonresidential property loans for which the primary source of repayment is the cash flow from the ongoing operations and activities conducted by the entity, or an affiliate of the entity, who owns the property. This category includes, among other loans, loans secured by office buildings, garden office buildings, manufacturing facilities, warehouse and flex warehouse facilities, hospitals, and car washes unless the property is owned by an investor who leases the property to the operator who, in turn, is not related to or affiliated with the investor. Commercial real estate non-owner occupied. Commercial real estate non-owner occupied are nonresidential property loans where the primary source of repayment is derived from rental income associated with the property or the proceeds of the sale, refinancing, or permanent financing of the property. This category includes, among other loans, loans secured by shopping centers, office buildings, hotels/motels, nursing homes, assisted-living facilities, mini-storage warehouse facilities, and similar properties. Construction and development < 60 months . Residential development loans include loans to develop raw land into a residential development. Advances on the loans typically include land costs, hard costs (grading, utilities, roads, etc.), soft costs (engineering fees, development fees, entitlement fees, etc.) and carrying costs until the development is completed. Upon completion of the development, the loan is typically repaid through the sale of lots to homebuilders. Construction residential real estate < 60 months. Residential construction includes loans to builders for speculative or custom homes, as well as direct loans to individuals for construction of their personal residence. Custom construction and self-construction loans typically will have commitments in place for long-term financing at the completion of construction. Speculative construction loans generally will have periodic curtailment plans beginning after completion of construction and a reasonable time for sales to have occurred. Residential real estate first lien. Residential real estate first lien loans includes all closed-end loans secured by first liens on 1-to-4 family residential properties. This category includes property containing 1-to-4 dwelling units (including vacation homes) or more than four dwelling units if each is separated from other units by dividing walls that extend from ground to roof. This category also includes individual condominium dwelling units and loans secured by an interest in individual cooperative housing units, even if in a building with five or more dwelling units. Residential real estate all other. Residential real estate all other loans includes loans secured by junior (i.e., other than first) liens on 1-to-4 family residential properties. This category includes loans secured by junior liens even if the Company also holds a loan secured by a first lien on the same 1-to-4 family residential property. Farmland. This category includes loans secured by all land known to be used or usable for agricultural purposes, such as crop and livestock production. Farmland includes grazing or pasture land, whether tillable or not and whether wooded or not. Commercial and agricultural non-real estate. Commercial and agricultural non-real estate represent loans for working capital, facilities acquisition or expansion, purchase of equipment and other needs of commercial customers primarily located within Oklahoma. Loans in this category include commercial and industrial, agriculture and state and political subdivisions. Consumer non-real estate. Consumer loans are loans to individuals for household, family and other personal expenditures. Commonly, such loans are made to finance purchases of consumer goods, such as automobiles, boats, household goods, vacations and education. Oil and gas. Oil and gas loans represent loans for producing oil and gas properties and any other mineral interests that may be pumped, mined, quarried or otherwise extracted from the earth primarily located within Oklahoma. These loans also include upstream and midstream energy loans, and loans to companies that provide ancillary services to the energy industry, such as transportation, wellsite preparation contractors and equipment manufacturers. Other loans. Other loans consist of loans approved by the SBA, which include loans funded through the PPP. Since PPP loans are fully guaranteed by the SBA, there is no expected credit loss related to these loans. In April 2020, the Company began originating loans to qualified small businesses under the PPP administered by the SBA. The Company had processing fees, which were recognized as interest income related to the PPP loans totaling $ 36.4 million and $ 15.5 million during the years ended December 31, 2021 and 2020, respectively. Troubled Debt Restructurings, Other Real Estate Owned and Repossessed Assets and Held for Sale Assets The following is a summary of troubled debt restructurings and other real estate owned and repossessed assets: December 31, 2021 2020 (Dollars in thousands) Troubled debt restructurings $ 3,665 $ 7,784 Other real estate owned and repossessed assets $ 39,553 $ 32,480 The Company charges interest on principal balances outstanding on troubled debt restructurings during deferral periods. The current and future financial effects of the recorded balance of loans considered to be troubled debt restructurings were not considered to be material. During the year ended December 31, 2021, the Company completed the move to its new corporate headquarters and transferred approximately $ 2.4 million from premises and equipment related to its previous headquarters to other real estate owned. During 2021, the Company sold property held in other real estate owned for a total gain of $ 618,000 compared to gains of $ 2.4 million in 2020 and $ 1.4 million in 2019. At December 31, 2020, the Company’s principal subsidiary bank, BancFirst, had approximately $ 21.6 million in loans at its Hugo, Oklahoma branch that it had entered into an agreement to sell to AmeriState Bank in Atoka, Oklahoma. Accordingly, as of December 31, 2020, the Company had transferred $ 21.6 million from loans held for investment (net of unearned interest) to loans held for sale. Nonaccrual loans Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $ 2.2 million in 2021, $ 2.8 million in 2020 and $ 1.7 million in 2019. Approximately $ 3.3 million of nonaccrual loans are guaranteed by government agencies as of December 31, 2021. The following table is a summary of amounts included in nonaccrual loans, segregated by portfolio segment. December 31, 2021 December 31, 2020 (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 2,900 $ 1,404 Commercial real estate non-owner occupied 407 4,719 Construction and development < 60 months 80 95 Construction residential real estate < 60 months — — Residential real estate first lien 2,763 3,615 Residential real estate all other 280 1,362 Farmland 4,224 7,901 Commercial and agricultural non-real estate 7,569 12,782 Consumer non-real estate 148 268 Oil and gas 1,070 — Other loans 1,451 5,399 Total $ 20,892 $ 37,545 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 our loans held for investment: Age Analysis of Past Due Loans 30-59 60-89 90 Days Total Current Total Loans Accruing (Dollars in thousands) December 31, 2021 Real estate: Commercial real estate owner occupied $ 972 $ 223 $ 1,363 $ 2,558 $ 682,181 $ 684,739 $ 18 Commercial real estate non-owner occupied 7,244 — — 7,244 1,088,080 1,095,324 — Construction and development < 60 months 136 — — 136 415,330 415,466 — Construction residential real estate < 60 months 2,264 — — 2,264 252,260 254,524 — Residential real estate first lien 3,351 567 2,817 6,735 930,271 937,006 1,704 Residential real estate all other 293 30 451 774 160,244 161,018 431 Farmland 253 37 2,077 2,367 269,812 272,179 139 Commercial and agricultural non-real estate 1,807 199 4,574 6,580 1,249,907 1,256,487 124 Consumer non-real estate 1,873 321 272 2,466 410,904 413,370 254 Oil and gas — — — — 428,908 428,908 — Other loans 1,773 347 2,646 4,766 245,655 250,421 2,294 Total $ 19,966 $ 1,724 $ 14,200 $ 35,890 $ 6,133,552 $ 6,169,442 $ 4,964 December 31, 2020 Real estate: Commercial real estate owner occupied $ 1,096 $ 108 $ 1,164 $ 2,368 $ 657,394 $ 659,762 $ — Commercial real estate non-owner occupied 323 — 34 357 1,050,382 1,050,739 35 Construction and development < 60 months 511 86 — 597 274,499 275,096 — Construction residential real estate < 60 months 1,106 — 282 1,388 228,805 230,193 282 Residential real estate first lien 5,428 1,463 2,978 9,869 920,707 930,576 945 Residential real estate all other 520 55 1,606 2,181 170,702 172,883 384 Farmland 1,297 344 6,223 7,864 246,466 254,330 135 Commercial and agricultural non-real estate 2,788 1,794 4,345 8,927 1,184,792 1,193,719 465 Consumer non-real estate 2,154 501 534 3,189 373,075 376,264 386 Oil and gas — — — — 428,866 428,866 — Other loans 951 1,223 6,618 8,792 813,286 822,078 2,170 Total $ 16,174 $ 5,574 $ 23,784 $ 45,532 $ 6,348,974 $ 6,394,506 $ 4,802 Section 4013 of the CARES Act and the Interagency Statement on Loan Modifications by Financial Institutions provides temporary relief from the accounting and reporting requirements for TDRs regarding certain loan modifications related to the Coronavirus Disease 2019 (“COVID-19”) that are offered by financial institutions. Sp ecifically, the CARES Act provides that a financial institution may elect to suspend (1) the requirements under U.S. GAAP for certain loan modifications that would otherwise be categorized as a TDR and (2) any determination that such loan modifications would be considered a TDR, including the related impairment for accounting purposes. The modifications that would qualify for this exception include any modification involving a loan that was not more than 30 days past due as of December 31, 2019, that occurs during the “applicable period,” including any of the following: • A forbearance arrangement. • An interest rate modification. • A repayment plan. • Any other similar arrangement that defers or delays the payment of principal or interest. The exception does not apply to any adverse impact on the credit of a borrower that is not related to the COVID-19 pandemic. Furthermore, even when the exception is applied, an entity may determine that it is appropriate to place the loan on nonaccrual status. Due to the impacts of the COVID-19 pandemic, the Company had approximately $ 53.9 million in modified loans as of December 31, 2021 and $ 81.7 million in modified loans as of December 31, 2020, most of which were secured by commercial real estate. These modifications were undertaken in response to Section 4013 of the CARES Act and the regulatory intent outlined in the Interagency Statement on Loan Modifications by Financial Institutions Working with Customers Affected by the Coronavirus and to provide businesses financial flexibility until the economy has time to recover to a more normal level of activity. However, these modifications, which typically involve payment modifications and forbearance, also have the effect of delaying recognition of loans that may ultimately be permanently impaired. The timing and extent of such consequences are difficult to ascertain at this time and are dependent on the duration of the COVID-19 pandemic, the level and success of the government’s economic stimulus, and further regulatory guidance. These modified loans are included in Current Loans in the table above. 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 are as follows: Grade 1 – Acceptable - Loans graded 1 represent reasonable and satisfactory credit risk which requires normal attention and supervision. Capacity to repay through primary and/or secondary sources is not questioned. Grade 2 – Acceptable - Increased Attention - This category consists of loans that have credit characteristics deserving management’s close attention. These complexities or potential weaknesses could result in deterioration of the repayment prospects for the loan or the Company's credit position at some future date. Such credit characteristics include loans to highly leveraged borrowers in cyclical industries, adverse financial trends which could potentially weaken repayment capacity, loans that have fundamental structure complexity or deficiencies, loans lacking secondary sources of repayment where prudent, and loans with deficiencies in essential documentation, including financial information. Grade 3 – Loans with Problem Potential - This category consists of performing loans which are considered to exhibit problem potential. Loans in this category would generally include, but not be limited to, borrowers with a weakened financial condition or poor performance history, past dues, loans restructured to reduce payments to an amount that is below market standards and/or loans with severe documentation problems. In general, these loans have no identifiable loss potential in the near future, however; the possibility of a loss developing is heightened. Grade 4 - Problem Loans/Assets – Nonperforming - This category consists of nonperforming loans/assets which are considered to be problems. Nonperforming loans are described as being 90 days and over past due and still accruing, and loans that are nonaccrual. The government guaranteed portion of SBA loans is excluded. Grade 5 - Loss Potential - This category consists of loans/assets which are considered to possess loss potential. While the loss may not occur in the current year, management expects that loans/assets in this category will ultimately result in a loss, unless substantial improvement occurs. Grade 6 - Charge Off - This category consists of loans that are considered uncollectible and other assets with little or no value. The Company’s revolving loans that are converted to term loans are not material and therefore have not been presented. The following tables summarize our gross loans held for investment by year of origination and internally assigned credit grades as of the period indicated: Term Loans Amortized Cost Basis by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total (Dollars in thousands) December 31, 2021 Commercial real estate owner occupied Grade 1 $ 136,757 $ 112,106 $ 97,417 $ 49,642 $ 28,208 $ 94,015 $ 17,669 $ 535,814 Grade 2 35,192 33,198 21,570 8,397 7,871 28,395 8,682 143,305 Grade 3 — 275 606 261 465 1,028 62 2,697 Grade 4 337 600 890 445 — 326 325 2,923 Total commercial real estate owner occupied loans 172,286 146,179 120,483 58,745 36,544 123,764 26,738 684,739 Commercial real estate non-owner occupied Grade 1 252,718 204,892 114,429 51,440 37,305 118,264 29,257 808,305 Grade 2 53,548 51,206 50,912 38,850 19,466 36,808 24,335 275,125 Grade 3 7,095 — 3,254 121 234 656 — 11,360 Grade 4 407 — — 35 — 92 — 534 Total commercial real estate non-owner occupied loans 313,768 256,098 168,595 90,446 57,005 155,820 53,592 1,095,324 Construction and development < 60 months Grade 1 173,384 34,351 57,729 9,276 1,953 4,181 32,294 313,168 Grade 2 37,275 7,511 13,161 4,526 803 510 37,153 100,939 Grade 3 1,273 — — 6 — — — 1,279 Grade 4 — — 56 6 18 — — 80 Total construction and development < 60 months 211,932 41,862 70,946 13,814 2,774 4,691 69,447 415,466 Construction residential real estate < 60 months Grade 1 193,311 7,786 41 — 18 29 16,247 217,432 Grade 2 28,170 2,564 — — — 425 5,455 36,614 Grade 3 478 — — — — — — 478 Total construction residential real estate < 60 months 221,959 10,350 41 — 18 454 21,702 254,524 Residential real estate first lien Grade 1 256,834 174,718 99,082 64,949 45,211 128,898 3,928 773,620 Grade 2 44,080 26,073 15,719 12,612 10,926 38,230 — 147,640 Grade 3 1,151 1,266 2,054 1,930 1,155 3,523 — 11,079 Grade 4 64 489 479 1,247 915 1,473 — 4,667 Total residential real estate first lien 302,129 202,546 117,334 80,738 58,207 172,124 3,928 937,006 Residential real estate all other Grade 1 16,376 13,320 8,691 5,609 4,101 12,386 30,840 91,323 Grade 2 2,183 2,941 1,919 1,500 895 2,202 55,000 66,640 Grade 3 250 98 112 232 702 309 538 2,241 Grade 4 156 180 — 38 12 84 344 814 Total residential real estate all other 18,965 16,539 10,722 7,379 5,710 14,981 86,722 161,018 Farmland Grade 1 47,485 39,216 23,627 15,180 12,579 29,457 6,946 174,490 Grade 2 16,063 8,702 23,688 5,488 4,159 10,848 10,455 79,403 Grade 3 3,587 4,021 1,514 74 1,293 1,316 3,386 15,191 Grade 4 1,109 379 — 1,121 109 145 232 3,095 Total farmland 68,244 52,318 48,829 21,863 18,140 41,766 21,019 272,179 Commercial and agricultural non-real estate Grade 1 353,164 102,137 83,615 33,943 27,701 43,750 288,745 933,055 Grade 2 85,920 30,568 25,097 9,607 2,612 10,575 105,682 270,061 Grade 3 2,995 2,185 1,347 11,479 1,291 599 26,642 46,538 Grade 4 870 212 1,222 654 573 1,109 2,193 6,833 Total commercial and agricultural non-real estate 442,949 135,102 111,281 55,683 32,177 56,033 423,262 1,256,487 Consumer non-real estate Grade 1 201,893 80,616 43,793 17,587 5,723 2,048 20,600 372,260 Grade 2 19,349 7,551 6,119 2,167 816 1,342 996 38,340 Grade 3 1,146 307 551 203 86 31 4 2,328 Grade 4 62 90 199 69 14 8 — 442 Total consumer non-real estate 222,450 88,564 50,662 20,026 6,639 3,429 21,600 413,370 Oil and gas Grade 1 188,072 26,090 6,579 1,257 89 73 139,687 361,847 Grade 2 17,150 9,774 13,909 2,657 170 215 13,186 57,061 Grade 3 6,641 10 — — — 255 2,024 8,930 Grade 4 1,000 — — — — — 70 1,070 Total oil and gas 212,863 35,874 20,488 3,914 259 543 154,967 428,908 Other loans Grade 1 109,830 38,379 28,176 20,171 13,908 8,425 26,076 244,965 Grade 2 283 — — 73 2,187 1,041 488 4,072 Grade 3 — — — — — 43 1,073 1,116 Grade 4 — 8 115 — — 44 101 268 Total other loans 110,113 38,387 28,291 20,244 16,095 9,553 27,738 250,421 Total loans held for investment $ 2,297,658 $ 1,023,819 $ 747,672 $ 372,852 $ 233,568 $ 583,158 $ 910,715 $ 6,169,442 Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total (Dollars in thousands) December 31, 2020 Commercial real estate owner occupied Grade 1 $ 136,638 $ 107,664 $ 75,262 $ 46,584 $ 37,857 $ 89,940 $ 18,941 $ 512,886 Grade 2 42,993 31,817 11,060 9,644 14,558 25,494 4,209 139,775 Grade 3 1,010 32 334 704 895 2,671 — 5,646 Grade 4 37 66 742 — 251 52 307 1,455 Total commercial real estate owner occupied loans 180,678 139,579 87,398 56,932 53,561 118,157 23,457 659,762 Commercial real estate non-owner occupied Grade 1 282,985 166,369 88,717 72,117 86,190 81,749 31,747 809,874 Grade 2 62,688 56,026 27,188 20,416 8,755 41,492 5,890 222,455 Grade 3 7,718 3,137 472 1,937 40 148 150 13,602 Grade 4 4,719 89 — — — — — 4,808 Total commercial real estate non-owner occupied loans 358,110 225,621 116,377 94,470 94,985 123,389 37,787 1,050,739 Construction and development < 60 months Grade 1 121,699 62,722 12,821 4,655 2,334 3,824 22,288 230,343 Grade 2 13,433 11,142 3,973 764 157 540 10,798 40,807 Grade 3 3,842 — 9 — — — — 3,851 Grade 4 — 64 9 22 — — — 95 Total construction and development < 60 months 138,974 73,928 16,812 5,441 2,491 4,364 33,086 275,096 Construction residential real estate < 60 months Grade 1 159,432 4,214 69 21 33 23 25,918 189,710 Grade 2 27,400 580 — — — 468 10,030 38,478 Grade 3 1,885 120 — — — — — 2,005 Total construction residential real estate < 60 months 188,717 4,914 69 21 33 491 35,948 230,193 Residential real estate first lien Grade 1 281,908 140,246 87,317 70,541 50,419 138,772 3,362 772,565 Grade 2 35,924 20,492 21,965 13,447 12,254 34,312 — 138,394 Grade 3 2,754 2,029 1,375 2,073 1,213 5,194 — 14,638 Grade 4 731 733 478 210 1,186 1,590 — 4,928 Grade 5 — — — — 51 — — 51 Total residential real estate first lien 321,317 163,500 111,135 86,271 65,123 179,868 3,362 930,576 Residential real estate all other Grade 1 21,492 15,461 11,010 6,717 5,381 11,037 29,851 100,949 Grade 2 3,694 1,675 1,268 1,809 450 2,793 56,295 67,984 Grade 3 384 461 328 116 119 221 494 2,123 Grade 4 204 217 570 65 34 715 22 1,827 Total residential real estate all other 25,774 17,814 13,176 8,707 5,984 14,766 86,662 172,883 Farmland Grade 1 51,284 27,116 18,993 13,821 13,517 27,100 8,185 160,016 Grade 2 15,737 30,684 6,639 6,391 4,763 8,916 7,140 80,270 Grade 3 3,681 290 152 1,055 703 551 1,955 8,387 Grade 4 414 14 4,058 296 340 223 312 5,657 Total farmland 71,116 58,104 29,842 21,563 19,323 36,790 17,592 254,330 Commercial and agricultural non-real estate Grade 1 225,207 146,263 118,571 77,547 46,687 37,767 256,282 908,324 Grade 2 64,187 40,901 29,787 6,590 7,054 22,710 73,134 244,363 Grade 3 18,922 1,400 1,402 723 271 327 12,659 35,704 Grade 4 584 1,607 652 241 1,139 146 959 5,328 Total commercial and agricultural non-real estate 308,900 190,171 150,412 85,101 55,151 60,950 343,034 1,193,719 Consumer non-real estate Grade 1 168,544 94,375 41,715 13,157 6,831 1,768 18,132 344,522 Grade 2 13,444 9,123 4,104 842 507 266 574 28,860 Grade 3 568 840 450 175 75 63 2 2,173 Grade 4 89 287 144 95 47 40 7 709 Total consumer non-real estate 182,645 104,625 46,413 14,269 7,460 2,137 18,715 376,264 Oil and gas Grade 1 151,000 19,288 15,589 464 25 4,777 92,123 283,266 Grade 2 73,882 11,996 6,217 396 169 81 34,210 126,951 Grade 3 9,010 111 64 66 364 — 2,418 12,033 Grade 4 6,600 — — — — 16 — 6,616 Total oil and gas 240,492 31,395 21,870 926 558 4,874 128,751 428,866 Other loans Grade 1 685,426 32,392 25,707 20,638 16,378 10,341 22,976 813,858 Grade 2 — — 17 2,936 1,126 2,179 692 6,950 Grade 3 — — 78 — 53 67 36 234 Grade 4 — — — 124 208 33 671 1,036 Total other loans 685,426 32,392 25,802 23,698 17,765 12,620 24,375 822,078 Total loans held for investment $ 2,702,149 $ 1,042,043 $ 619,306 $ 397,399 $ 322,434 $ 558,406 $ 752,769 $ 6,394,506 Allowance for Credit Losses Methodology On January 1, 2020, the Company adopted ASC 326, which replaces the incurred loss methodology for determining its provision for credit losses and allowance for credit losses with an expected 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. Upon adoption, the allowance for credit losses was decreased by $ 3.2 million, with no impact to the consolidated statement of income. Subsequent to the adoption of ASC 326, the Company recorded a $ 62.6 million provision for credit losses for year ended December 31, 2020 utilizing the newly adopted CECL methodology, a significant increase from the year ended December 31, 2019. The increase resulted primarily from the anticipated impact on our loan portfolio resulting from the economic outlook related to the COVID-19 pandemic and the decline in energy prices and to a lesser degree, loan growth during 2020. The decrease in the allowance for credit loss during 2021 was driven by a reversal of provision during 2021 based on sustained improvements in the economy, both nationally and in the Company's markets, which reduced the amount of expected credit loss within the loan portfolio. This reduction was partially offset by additional allowance for credit loss required by newly acquired 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 Impact of CECL adoption Initial allowance on loans purchased with credit deterioration Charge- Recoveries Net Provision Balance at (Dollars in thousands) Year ended December 31, 2021 Real estate: Commercial real estate owner occupied $ 6,911 $ — $ 1,080 $ ( 38 ) $ 74 $ 36 $ ( 1,617 ) $ 6,410 Commercial real estate non-owner occupied 12,318 — 824 ( 803 ) 67 ( 736 ) 4,581 16,987 Construction and development < 60 months 2,723 — 173 — 12 12 582 3,490 Construction residential real estate < 60 months 726 — — — — — 366 1,092 Residential real estate first lien 2,822 — 126 ( 87 ) 55 ( 32 ) 160 3,076 Residential real estate all other 2,236 — — ( 521 ) 52 ( 469 ) 337 2,104 Farmland 3,153 — 395 ( 889 ) 1 ( 888 ) 2,162 4,822 Commercial and agricultural non-real estate 33,020 — 5,663 ( 4,509 ) 218 ( 4,291 ) ( 8,319 ) 26,073 Consumer non-real estate 3,542 — 38 ( 864 ) 326 ( 538 ) 692 3,734 Oil and gas 20,733 — — — — — ( 7,755 ) 12,978 Other loans 3,182 — — ( 134 ) 1 ( 133 ) 121 3,170 Total $ 91,366 $ — $ 8,299 $ ( 7,845 ) $ 806 $ ( 7,039 ) $ ( 8,690 ) $ 83,936 Balance at Impact of CECL adoption Initial allowance on loans purchased with credit deterioration Charge- Recoveries Net Provision Balance at Year ended December 31, 2020 Real estate: Commercial real estate owner occupied $ 5,600 $ ( 2,704 ) $ 432 $ ( 773 ) $ 10 $ ( 763 ) $ 4,346 $ 6,911 Commercial real estate non-owner occupied 8,459 ( 5,265 ) — ( 3,609 ) — ( 3,609 ) 12,733 12,318 Construction and development < 60 months 2,276 ( 916 ) — ( 59 ) 123 64 1,299 2,723 Construction residential real estate < 60 months 1,960 ( 690 ) — ( 29 ) — ( 29 ) ( 515 ) 726 Residential real estate first lien 8,781 ( 3,052 ) 7 ( 465 ) 44 ( 421 ) ( 2,493 ) 2,822 Residential real estate all other 2,763 ( 1,383 ) — ( 126 ) 54 ( 72 ) 928 2,236 Farmland 2,818 ( 1,402 ) 1 ( 2,055 ) — ( 2,055 ) 3,791 3,153 Commercial and agricultural non-real estate 12,310 13,949 62 ( 4,161 ) 540 ( 3,621 ) 10,320 33,020 Consumer non-real estate 3,284 ( 548 ) — ( 1,142 ) 224 ( 918 ) 1,724 3,542 Oil and gas 3,355 ( 1,068 ) — ( 11,245 ) — ( 11,245 ) 29,691 20,733 Other loans 2,632 ( 116 ) — ( 168 ) 10 ( 158 ) 824 3,182 Total $ 54,238 $ ( 3,195 ) $ 502 $ ( 23,832 ) $ 1,005 $ ( 22,827 ) $ 62,648 $ 91,366 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 purchased credit deteriorated loans for the period are as follows: Loans acquired with deteriorated credit quality (Dollars in thousands) For the year ended December 31, 2021 Purchase price of loans at acquisition $ 39,284 Allowance for credit losses at acquisition 8,299 Par value of acquired loans at acquisition $ 47,583 For the year ended December 31, 2020 Purchase price of loans at acquisition $ 1,761 Allowance for credit losses at acquisition 502 Par value of acquired loans at acquisition $ 2,263 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 years ended December 31, 2021 and 2020, 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 As of December 31, 2021 (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 1,952 $ — $ — $ — $ 1,952 $ 576 Commercial real estate non-owner occupied 1,404 — — — 1,404 263 Construction and development < 60 months — — — — — — Construction residential real estate < 60 months — — — — — — Residential real estate first lien 871 — — — 871 143 Residential real estate all other 199 — — — 199 178 Farmland 8,703 — — — 8,703 1,805 Commercial and agricultural non-real estate — 6,363 — 5,202 11,565 4,867 Consumer non-real estate — — — 54 54 20 Oil and gas — — — — — — Other loans — 109 — — 109 71 Total collateral-dependent loans held for investment $ 13,129 $ 6,472 $ — $ 5,256 $ 24,857 $ 7,923 Collateral Type Real Estate Business Assets Energy Reserves Other Assets Total Specific Allocation As of December 31, 2020 (Dollars in thousands) Real estate: Commercial real e

Premises and Equipment, Net and

Premises and Equipment, Net and Other Assets	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Premises and Equipment, Net and Other Assets	(6) PREMISES AND EQUIPMENT, NET AND OTHER ASSETS The following is a summary of premises and equipment by classification: December 31, Estimated 2021 2020 (Dollars in thousands) Land $ 44,588 $ 45,792 Buildings 10 to 40 years 256,738 201,606 Furniture, fixtures and equipment 3 to 15 years 89,058 87,001 Construction in progress 12,335 61,300 Accumulated depreciation ( 133,672 ) ( 134,022 ) Premises and equipment, net $ 269,047 $ 261,677 Non-cash items in Premises and Equipment, Net As of December 31, 2021, the Company had approximate ly $ 1.0 mill ion in construction in progress for retainage payable. Retainage payable is not remitted to the vendor until completion of the project and is therefore not included in the statement of cash flow. Construction in Progress Construction in progress included in the table above is primarily related to the renovation of BancFirst Tower, which began in 2018. When renovations on the building are completed, the asset is reclassified as buildings and depreciated over its applicable useful life. Other Assets Other assets includes the cash surrender value of key-man life insurance policies totaling $ 81.4 million at December 31, 2021 and $ 80.7 million at December 31, 2020. Equity securities are reported in other assets on the 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 w as $ 10.6 mil lion at December 31, 2021 and $ 10.1 million at December 31, 2020. The balance of other assets included equity interests of previous borrowers in the oil and gas industry, which were received through bankruptcy proceedings, which totaled approximately $ 16.4 million at December 31, 2021 and approximately $ 11.1 million at December 31, 2020. 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 Tax Credit Investments The Company invests in affordable housing projects that qualify for the low income housing tax credit (LIHTC), which is designed to promote private development of low income housing. These investments generate a return primarily through realization of federal tax credits, and also through a tax deduction generated by operating losses of the investments. The investments are amortized through tax expense using the proportional amortization method as related tax credits are utilized. The Company is periodically required to provide additional contributions at the discretion of the project sponsors. Although in some cases the Company’s investment may exceed 50 % of the equity interest in an entity, the Company does not consolidate these structures as variable interest entities due to the project sponsor’s ability to manage the projects, which is indicative of power in them. Total LIHTC investments were $ 20.1 million and $ 18.1 million at December 31, 2021 and 2020, respectively and are included in other assets on the balance sheet. The Company recognized tax credits and other tax benefits of $ 6.5 mi llion, $ 5.6 million and $ 5.4 million in 2021, 2020 and 2019, respectively and amortization expense of $ 5.5 million, $ 4.6 million and $ 4.5 million in 2021, 2020 and 2019, respectively resulting from LIHTC investments. Additional contributions are committed during the investment periods through the ye ar 2033. Unfunded commitments to these investments as of December 31, 2021 tot aled $ 17.0 mil lion. New Market Tax Credit Investments The Company also invests in active low income community businesses that qualify for New Market Tax Credits (NMTC). NMTC investments are made through Community Development Entities (CDE) and such entities are qualified through the US Department of the Treasury. NMTCs are earned for a qualified entity investment made by a taxpayer in CDEs if substantially all of the investment is used by the CDE to make qualified investments. It is through its equity contributions into the CDE entities that the Company is able to receive the benefits of the NMTCs. The amount of the NMTC is equal to 39 % of the qualified investment taken over a seven year period. The investments are amortized through other noninterest expense using the effective yield method as related tax credits are utilized. The Company does not consolidate these CDEs as variable interest entities due to the control the allocatee of the tax credits has over the entity. Total NMTC investments were $ 15.2 million and $ 18.5 million at December 31, 2021 and 2020, respectively and are included in other assets on the balance sheet. The Company recognized tax cred its of $ 4.0 m illion, $ 4.0 million and $ 4.5 million in 2021, 2020 and 2019, respectively and amortization expe nse of $ 3.3 m illion, $ 3.3 million, and $ 3.7 million in 2021, 2020 and 2019 , respectively resulting from NMTC investments. NMTC investments are funded in full in the year they begin. There are no unfunded commitments.

Intangible Assets and Goodwill

Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	(7) INTANGIBLE ASSETS AND GOODWILL The following is a summary of intangible assets: Gross Accumulated Net (Dollars in thousands) As of December 31, 2021 Core deposit intangibles $ 27,433 $ ( 10,311 ) 17,122 Customer relationship intangibles 3,350 ( 2,906 ) 444 Total $ 30,783 $ ( 13,217 ) $ 17,566 As of December 31, 2020 Core deposit intangibles $ 33,411 $ ( 15,076 ) $ 18,335 Customer relationship intangibles 3,350 ( 2,686 ) 664 Total $ 36,761 $ ( 17,762 ) $ 18,999 Estimated amortization of intangible assets for the next five years, as of December 31, 2021, is as follows (dollars in thousands): Estimated Amortization 2022 $ 2,879 2023 2,862 2024 2,862 2025 2,645 2026 2,033 At December 31, 2021 , the weighted-average remaining life of all intangible assets was approximately 6.6 years, which consisted of customer relationship intangibles with a weighted-average life of 3.5 years and core deposit intangibles with a weighted-average life of 6.7 years. The following is a summary of goodwill by business segment: Other Executive, Metropolitan Community Pegasus Financial Operations Banks Banks Bank Services & Support Consolidated (Dollars in thousands) Year Ended December 31, 2021 Balance at beginning and end of period $ 13,767 $ 61,212 $ 68,855 $ 5,464 $ 624 $ 149,922 Year Ended December 31, 2020 Balance at beginning of period $ 13,767 $ 59,894 $ 68,855 $ 5,464 $ 624 $ 148,604 Acquisitions — 1,318 — — — 1,318 Balance at end of period $ 13,767 $ 61,212 $ 68,855 $ 5,464 $ 624 $ 149,922 The Company acquired Citizens on March 5, 2020 , which added $ 1.3 million in goodwill.

Time Deposits

Time Deposits	12 Months Ended
	Dec. 31, 2021
Deposits [Abstract]
Time Deposits	(8) TIME DEPOSITS Time deposits include certificates of deposit and individual retirement accounts. At December 31, 2021, the scheduled maturities of all time deposits are as follows (Dollars in thousands): 2022 $ 465,804 2023 95,294 2024 34,946 2025 19,649 2026 19,273 Total $ 634,966 The following table is a summary of time deposits that meet or exceed the current Federal Deposit Insurance Corporation ("FDIC") insurance limit for the periods presented: December 31, 2021 2020 (Dollars in thousands) Time deposits of $250,000 or more $ 150,393 $ 154,646

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2021
Short-term Debt [Abstract]
Short-Term Borrowings	(9) SHORT-TERM BORROWINGS The following is a summary of short-term borrowings: December 31, 2021 2020 (Dollars in thousands) Federal funds purchased $ — $ 1,100 Weighted average interest rate 0.08 % 0.30 % End of period interest rate 0.10 % 0.05 % Federal funds purchased represent borrowings of overnight funds from other financial institutions.

Line of Credit

Line of Credit	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Line of Credit	(10) LINES OF CREDIT BancFirst has a line of credit from the FHLB of Topeka, Kansas to use for liquidity or to match-fund certain long-term fixed rate loans. BancFirst's assets, including residential first mortgages of $ 860.8 million, are pledged as collateral for the borrowings under the line of credit. As of December 31, 2021 , BancFirst had the ability to draw up to $ 672.2 million on the FHLB line of credit based on FHLB stock holdings of $ 651,100 with no advances outstanding. In addition, BancFirst has a $ 25.0 million line of credit with another financial institution that is an overnight federal funds facility. Pegasus Bank also has a $ 20.0 million line of credit with another financial institution that is an overnight federal funds facility.

Subordinated Debt

Subordinated Debt	12 Months Ended
	Dec. 31, 2021
Brokers and Dealers [Abstract]
Subordinated Debt	(11) 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 expects to use 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.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	(12) INCOME TAXES The components of the Company’s income tax expense (benefit) are as follows: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Current taxes: Federal $ 28,359 $ 25,974 $ 26,247 State 5,365 7,443 7,288 Deferred taxes 7,044 ( 9,491 ) 1,148 Total income taxes $ 40,768 $ 23,926 $ 34,683 Income tax (benefit) expense applicable to securities transactions approximated $ 220,000 , $( 82,000 ) and $ 171,000 for the years ended December 31, 2021, 2020 and 2019, respectively. A reconciliation of tax expense at the federal statutory tax rate applied to income before taxes is presented in the following table. The federal statutory tax rate was 21 % in 2021, 2020 and 2019: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Tax expense at the federal statutory tax rate $ 43,764 $ 25,937 $ 35,377 Increase (decrease) in tax expense from: Tax-exempt income, net ( 436 ) ( 507 ) ( 581 ) Modified endowment life contracts ( 501 ) ( 508 ) ( 519 ) Share based compensation excess tax benefit ( 1,643 ) ( 412 ) ( 765 ) Tax deductible dividends paid on ESOP ( 490 ) ( 453 ) — State tax expense, net of federal tax benefit 4,779 5,606 5,757 Bargain purchase gain ( 1,007 ) — — Utilization of tax credits: New markets tax credits, net of tax expense ( 3,192 ) ( 3,121 ) ( 3,547 ) Low-income housing tax credits, net of amortization ( 1,533 ) ( 1,273 ) ( 1,266 ) Other tax credits ( 379 ) ( 320 ) — Other, net 1,406 ( 1,023 ) 227 Total tax expense $ 40,768 $ 23,926 $ 34,683 The net deferred tax asset consisted of the following and is reported in other assets: December 31, 2021 2020 (Dollars in thousands) Provision for credit losses $ 17,654 $ 22,500 Write-downs of other real estate owned 255 143 Deferred compensation 2,320 2,325 Stock-based compensation 1,575 1,672 Investments in partnership interests 3,840 4,695 Other 901 405 Gross deferred tax assets 26,545 31,740 Unrealized net gains on securities ( 684 ) ( 2,513 ) Premium on securities of banks acquired ( 120 ) ( 144 ) Intangibles ( 5,756 ) ( 6,135 ) Basis difference related to tax credits ( 2,979 ) ( 2,127 ) Depreciation ( 14,545 ) ( 11,529 ) Prepaid expense deducted ( 1,120 ) ( 1,208 ) Other ( 169 ) ( 178 ) Gross deferred tax liabilities ( 25,373 ) ( 23,834 ) Net deferred tax asset $ 1,172 $ 7,906 The Company recognizes accrued interest and penalties related to unrecognized tax benefits, if applicable, in income tax expense. During the years ended December 31, 2021, 2020 and 2019 , the Company did no t recognize or accrue any interest and penalties related to unrecognized tax benefits. Federal and various state income tax statutes dictate that tax returns filed in any of the previous three reporting periods remain open to examination, which includes tax return years 2018 to 2020 . In addition, the 2018 return was amended and therefore will remain open through 2023 . The Company has no open examinations with either the Internal Revenue Service or any state agency. Management performs an analysis of the Company’s tax position annually and believes it is more likely than not that all of its tax positions will be utilized in future years.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	(13) STOCK-BASED COMPENSATION The Company has had a nonqualified incentive stock option plan, the BancFirst Corporation Stock Option Plan (the “Employee Plan”), since May 1986. At December 31, 2021 , there were 158,500 shares available for future grants. The Employee Plan will terminate on December 31, 2024 , if not extended. The options vest and are exercisable beginning four years from the date of grant at the rate of 25 % per year for four years . Options expire no later than the end of fifteen years from the date of grant. The option price must be no less than 100 % of the fair value of the stock relating to such option at the date of grant. The Company has had the BancFirst Corporation Non-Employee Directors’ Stock Option Plan (the “Non-Employee Directors’ Plan”) since June 1999. Each non-employee director is granted an option for 10,000 shares. At December 31, 2021 , there were 40,000 shares available for future grants. The Non-Employee Directors’ Plan will terminate on December 31, 2024 , if not extended. The options 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 option price must be no less than 100 % of the fair value of the stock relating to such option at the date of grant. The Company currently uses newly issued shares for stock option exercises, but reserves the right to use shares purchased under the Company’s Stock Repurchase Program (the “SRP”) in the future. Although not required or expected, the Company may settle some options in cash on a limited basis at the discretion of the Company. During the year ended December 31, 2021 , the Company had cash settlements for 121,330 shares for a total net cash settlement of options of $ 5.5 million that did not increase the outstanding shares of the Company. T he 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) Year Ended December 31, 2021 Outstanding at December 31, 2020 1,343,080 $ 35.28 Options granted 179,500 62.13 Options exercised ( 214,330 ) 23.40 Options canceled, forfeited, or expired ( 5,000 ) 44.23 Outstanding at December 31, 2021 1,303,250 40.90 8.40 Yrs $ 38,656 Exercisable at December 31, 2021 614,875 28.03 7.15 Yrs $ 26,153 Year Ended December 31, 2020 Outstanding at December 31, 2019 1,257,730 $ 32.70 Options granted 171,000 48.89 Options exercised ( 76,650 ) 20.53 Options canceled, forfeited, or expired ( 9,000 ) 58.26 Outstanding at December 31, 2020 1,343,080 35.28 8.61 Yrs $ 31,453 Exercisable at December 31, 2020 710,330 25.06 6.94 Yrs $ 23,894 The following table has additional information regarding options exercised under both the Employee Plan and the Non-Employee Directors’ Plan: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Total intrinsic value of options exercised $ 9,264 $ 2,315 $ 3,982 Cash received from options exercised 5,015 1,574 2,282 Tax benefit realized from options exercised 2,360 590 1,014 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 following table is a summary of the Company’s recorded stock-based compensation expense: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Stock-based compensation expense $ 2,133 $ 1,516 $ 1,277 Tax benefit 513 386 325 Stock-based compensation expense, net of tax $ 1,620 $ 1,130 $ 952 The Company will continue to amortize the unearned stock-based compensation expense over the remaining vesting period of approximately seven years . The following table shows the unearned stock-based compensation expense: December 31, 2021 (Dollars in thousands) Unearned stock-based compensation expense $ 7,109 T he following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented: Year Ended December 31, 2021 2020 2019 Weighted average grant-date fair value per share of options granted $ 21.16 $ 10.85 $ 13.34 Risk-free interest rate 1.30 to 1.74 % 0.64 to 1.13 % 1.55 to 2.76 % Dividend yield 2.00 % 2.00 % 2.00 % Stock price volatility 35.55 to 36.39 % 22.84 to 36.1 % 22.93 to 23.63 % Expected term 10 Yrs 10 Yrs 10 Yrs 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. The Company has had the BancFirst Corporation Directors’ Deferred Stock Compensation Plan (the “Deferred Stock Compensation Plan”) since May 1999. As of December 31, 2021 , there are 34,125 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 the director or community board member terminates serving as a board member. Shares of common stock of the Company are then distributed to the terminating director or community board member based upon the number of stock units accumulated in his or her account. There were 5,400 and 8,218 shares of common stock distributed from the Deferred Stock Compensation Plan during the years ended December 31, 2021 and 2020, respectively. A summary of the accumulated stock units is as follows: December 31, 2021 2020 Accumulated stock units 152,754 148,278 Average price $ 30.86 $ 28.57

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Retirement Plans	(14) RETIREMENT PLANS Since January 1, 2009, the Company has had two individual retirement plans. The Thrift Plan (“401(k)”) and Employee Stock Ownership Plan (“ESOP”) cover all eligible employees, as defined in the plans, of the Company and its subsidiaries. The 401(k) allows employees to defer up to the maximum legal limit of their compensation, of which the Company may match up to 3 % of their compensation. In addition, the Company may make discretionary contributions based on employee contributions or eligible compensation to the ESOP, as determined by the Company’s Board of Directors. The ESOP sponsor purchases shares from the open market. These shares are included in the calculation of the basic earnings per share. Dividends issued on these shares are reinvested into the ESOP. The ESOP is not leveraged. The aggregate amounts of contributions by the Company to the 401(k) and ESOP are shown in the following table: December 31, 2021 2020 2019 (Dollars in thousands) 401(k) contributions $ 2,856 $ 2,986 $ 2,526 ESOP contributions 4,317 3,689 4,403 Total contributions $ 7,173 $ 6,675 $ 6,929

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Stockholders' Equity	(15) STOCKHOLDERS’ EQUITY As of December 31, 2021, 2020 and 2019 the Company’s authorized and outstanding preferred and common stock was as follows: No. of Shares No. of Shares Outstanding at December 31, Class of Stock December 31, 2021 2021 2020 2019 Par Value Dividends Voting Rights Senior Preferred 10,000,000 — — — $ 1.00 As declared Voting 10% Cumulative 900,000 — — — 5.00 As declared Non-voting Common 40,000,000 32,603,118 32,719,852 32,694,268 1.00 As declared Voting The following is a description of the capital stock of the Company: (a) Senior Preferred Stock: No shares issued or outstanding. Shares may be issued with such voting, dividend, redemption, sinking fund, conversion, exchange, liquidation and other rights as shall be determined by the Company’s Board of Directors, without approval of the stockholders. The Senior Preferred Stock would have a preference over common stock as to payment of dividends, as to the right to distribution of assets upon redemption of such shares or upon liquidation of the Company. (b) 10% Cumulative Preferred Stock: Redeemable at the Company’s option at $ 5.00 per share plus accumulated dividends; non-voting; cumulative dividends at the rate of 10 % payable semi-annually on January 15 and July 15; no shares issued or outstanding. (c) Common stock: At December 31, 2021, 2020 and 2019 the shares issued equaled shares outstanding. In November 1999, the Company adopted a Stock Repurchase Program (the “SRP”). The SRP may be used as a means to increase earnings per share and return on equity, 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. During September 2021, the SRP was amended to permit the repurchase of an additional 650,000 shares. The following table is a summary of the shares under the program: Year Ended December 31, 2021 2020 2019 Number of shares repurchased 212,296 59,284 26,670 Average price of shares repurchased $ 54.94 $ 52.26 $ 60.04 Shares remaining to be repurchased 500,486 62,782 122,066 The Company’s ability to pay dividends is dependent upon dividend payments received from BancFirst. Banking regulations limit bank dividends based upon net earnings retained and minimum capital requirements. Dividends in excess of these requirements require regulatory approval. At January 1, 2022, approximately $ 153.3 million of the equity of BancFirst was available for dividend payments to the Company. During any deferral period or any event of default on the Junior Subordinated Debentures, the Company may not declare or pay any dividends on any of its capital stock. The Company, BancFirst and Pegasus Bank are subject to risk-based capital guidelines issued by the Board of Governors of the Federal Reserve System and the FDIC. These guidelines are used to evaluate capital adequacy and involve both quantitative and qualitative evaluations of the Company’s, BancFirst’s and Pegasus Bank’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 financial statements. Management believes that as of December 31, 2021 , the Company, BancFirst and Pegasus Bank met all capital adequacy requirements to which they are subject. The actual and required capital amounts and ratios are shown in the following table: Actual Required For Capital Adequacy Purposes With Capital Consevation Buffer To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) As of December 31, 2021: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,171,215 17.30 % $ 541,493 8.00 % $ 710,709 10.50 % N/A N/A BancFirst 1,004,835 16.75 % 479,883 8.00 % 629,847 10.50 % $ 599,854 10.00 % Pegasus Bank 88,224 11.62 % 60,765 8.00 % 79,754 10.50 % 75,956 10.00 % Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,002,096 14.80 % $ 304,590 4.50 % $ 473,806 7.00 % N/A N/A BancFirst 909,817 15.17 % 269,934 4.50 % 419,898 7.00 % $ 389,905 6.50 % Pegasus Bank 82,056 10.80 % 34,180 4.50 % 53,170 7.00 % 49,372 6.50 % Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,028,096 15.19 % $ 406,120 6.00 % $ 575,336 8.50 % N/A N/A BancFirst 929,817 15.50 % 359,913 6.00 % 509,876 8.50 % $ 479,883 8.00 % Pegasus Bank 82,056 10.80 % 45,574 6.00 % 64,563 8.50 % 60,765 8.00 % Tier 1 Capital (to Total Assets)- BancFirst Corporation $ 1,028,096 9.14 % $ 449,847 4.00 % N/A N/A N/A N/A BancFirst 929,817 9.22 % 403,460 4.00 % N/A N/A $ 504,325 5.00 % Pegasus Bank 82,056 6.98 % 47,054 4.00 % N/A N/A 58,817 5.00 % As of December 31, 2020: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 997,383 15.64 % $ 510,110 8.00 % $ 669,519 10.50 % N/A N/A BancFirst 898,714 15.59 % 461,142 8.00 % 605,248 10.50 % $ 576,427 10.00 % Pegasus Bank 70,922 11.85 % 47,893 8.00 % 62,860 10.50 % 59,866 10.00 % Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 891,534 13.98 % $ 286,937 4.50 % $ 446,346 7.00 % N/A N/A BancFirst 806,478 13.99 % 259,392 4.50 % 403,499 7.00 % $ 374,678 6.50 % Pegasus Bank 66,150 11.05 % 26,940 4.50 % 41,906 7.00 % 38,913 6.50 % Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 917,534 14.39 % $ 382,583 6.00 % $ 541,992 8.50 % N/A N/A BancFirst 826,478 14.34 % 345,856 6.00 % 489,963 8.50 % $ 461,142 8.00 % Pegasus Bank 66,150 11.05 % 35,920 6.00 % 50,886 8.50 % 47,893 8.00 % Tier 1 Capital (to Total Assets)- BancFirst Corporation $ 917,534 9.63 % $ 380,952 4.00 % N/A N/A N/A N/A BancFirst 826,478 9.48 % 348,666 4.00 % N/A N/A $ 435,833 5.00 % Pegasus Bank 66,150 8.10 % 32,682 4.00 % N/A N/A 40,852 5.00 % As of December 31, 2021 , the most recent notification from the Federal Reserve Bank of Kansas City and the FDIC categorized BancFirst and Pegasus Bank as “well capitalized” under the prompt corrective action provisions. The Common Equity Tier 1 Capital of the Company, BancFirst and Pegasus Bank 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 the Company, BancFirst and Pegasus Bank 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. There are no conditions or events since the most recent notification of BancFirst and Pegasus Bank’s capital category that management believes would materially change its category under capital requirements existing as of the report date. 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 Subordinated Notes. The Subordinated Notes have been structured to qualify as Tier 2 capital under bank regulatory guidelines. In April 2020, the Company began originating loans to qualified small businesses under the PPP administered by the SBA. Federal bank regulatory agencies have issued an interim final rule that permits banks to neutralize the regulatory capital effects of participating in the Paycheck Protection Program Lending Facility (the “PPP Facility”) and clarify that PPP loans have a zero percent risk weight under applicable risk-based capital rules. Specifically, a bank may exclude all PPP loans pledged as collateral to the PPP Facility from its average total consolidated assets for the purposes of calculating its leverage ratio, while PPP loans that are not pledged as collateral to the PPP Facility are included. The PPP loans the Company originated in 2021 and 2020 are included in the calculation of the Company’s leverage ratio as of December 31, 2021 and December 31, 2020 as the Company did not utilize the PPP Facility for funding purposes. In connection with the adoption of ASC 326 , the Company recognized an after-tax cumulative effect reduction to retained earnings totaling $ 2.3 million in 2020. In February 2019, the federal bank regulatory agencies issued a final rule (the “2019 CECL Rule”) that revised certain capital regulations to account for changes to credit loss accounting under U.S. GAAP. The 2019 CECL Rule included a transition option that allows banking organizations to phase in, over a three-year period, the day-one adverse effects of CECL on their regulatory capital ratios (three-year transition option). In March 2020, the federal bank regulatory agencies issued an interim final rule that maintains the three-year transition option of the 2019 CECL Rule and also provides banking organizations that were required under U.S. GAAP (as of January 2020) to implement CECL before the end of 2020 the option to delay for two years an estimate of the effect of CECL on regulatory capital, relative to the incurred loss methodology’s effect on regulatory capital, followed by a three-year transition period (five-year transition option). The Company elected not to adopt the five-year transition option.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Net Income Per Common Share	(16) NET INCOME PER COMMON SHARE Basic and diluted net income per common share are calculated as follows: Income Shares Per Share (Dollars in thousands, except per share data) Year Ended December 31, 2021 Basic Income available to common stockholders $ 167,630 32,716,099 $ 5.12 Dilutive effect of stock options — 598,047 Diluted Income available to common stockholders plus assumed $ 167,630 33,314,146 $ 5.03 Year Ended December 31, 2020 Basic Income available to common stockholders $ 99,586 32,672,522 $ 3.05 Dilutive effect of stock options — 538,430 Diluted Income available to common stockholders plus assumed $ 99,586 33,210,952 $ 3.00 Year Ended December 31, 2019 Basic Income available to common stockholders $ 134,879 32,639,396 $ 4.13 Dilutive effect of stock options — 690,448 Diluted Income available to common stockholders plus assumed $ 134,879 33,329,844 $ 4.05 The following table shows the number and average exercise price of options that were excluded from the computation of diluted net income per common share for each year because the options were anti-dilutive for the period. Shares Average Price December 31, 2021 189,780 $ 60.33 December 31, 2020 402,575 52.72 December 31, 2019 180,989 54.73

Condensed Parent Company Financ

Condensed Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2021
Condensed Financial Information Disclosure [Abstract]
Condensed Parent Company Financial Statements	(17) CONDENSED PARENT COMPANY FINANCIAL STATEMENTS BALANCE SHEETS December 31, 2021 2020 (Dollars in thousands) ASSETS Cash $ 62,007 $ 9,081 Investments in subsidiaries 1,117,622 1,003,017 Goodwill 69,478 69,478 Core deposit premium 7,627 8,622 Dividends receivable 13,426 12,750 Other assets 1,515 5,331 Total assets $ 1,271,675 $ 1,108,279 LIABILITIES AND STOCKHOLDERS’ EQUITY Other liabilities $ 13,954 $ 13,590 Subordinated debt 85,987 26,804 Stockholders’ equity 1,171,734 1,067,885 Total liabilities and stockholders’ equity $ 1,271,675 $ 1,108,279 STATEMENTS OF INCOME Year Ended December 31, 2021 2020 2019 (Dollars in thousands) OPERATING INCOME Dividends from subsidiaries $ 54,480 $ 50,872 $ 77,559 Interest on interest-bearing deposits 41 1 1,150 Other 1,071 886 451 Total operating income 55,592 51,759 79,160 OPERATING EXPENSE Interest 3,130 1,965 1,965 Other 3,340 3,317 5,017 Total operating expense 6,470 5,282 6,982 Income before taxes and equity in undistributed earnings of subsidiaries 49,122 46,477 72,178 Allocated income tax benefit 4,191 2,610 2,731 Income before equity in undistributed earnings of subsidiaries 53,313 49,087 74,909 Equity in undistributed earnings of subsidiaries 116,365 51,955 61,194 Amortization of stock-based compensation arrangements of subsidiaries ( 2,048 ) ( 1,456 ) ( 1,224 ) Net income $ 167,630 $ 99,586 $ 134,879 STATEMENTS OF CASH FLOW Year Ended December 31, 2021 2020 2019 (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 167,630 $ 99,586 $ 134,879 Adjustments to reconcile to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries ( 116,365 ) ( 51,955 ) ( 61,194 ) Amortization of stock-based compensation arrangements of subsidiaries 2,048 1,456 1,224 Other, net 5,056 188 ( 440 ) Net cash provided by operating activities 58,369 49,275 74,469 INVESTING ACTIVITIES Payments for investments in subsidiaries ( 9,000 ) ( 1,000 ) ( 134,457 ) Other, net 4,429 ( 1,175 ) ( 418 ) Net cash used in investing activities ( 4,571 ) ( 2,175 ) ( 134,875 ) FINANCING ACTIVITIES Issuance of common stock 2,260 1,790 2,484 Common stock acquired ( 11,663 ) ( 3,098 ) ( 1,601 ) Net cash settlement of options ( 5,479 ) — — Cash dividends paid ( 45,140 ) ( 42,472 ) ( 39,805 ) Proceeds from the issuance of subordinated notes, net of debt issuance costs 59,150 — — Net cash used in financing activities ( 872 ) ( 43,780 ) ( 38,922 ) Net increase (decrease) in cash and due from banks 52,926 3,320 ( 99,328 ) Cash and due from banks at the beginning of the period 9,081 5,761 105,089 Cash and due from banks at the end of the period $ 62,007 $ 9,081 $ 5,761 SUPPLEMENTAL DISCLOSURE Cash paid during the period for interest $ 3,130 $ 1,966 $ 5,131 Cash received during the period for income taxes, net $ 4,411 $ 2,812 $ 4,518

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	(18) RELATED PARTY TRANSACTIONS Refer to Note (5) for information regarding loan transactions with related parties.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	(19) COMMITMENTS AND CONTINGENT LIABILITIES The Company is a party to financial instruments with off balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include loan commitments and standby letters of credit, which involve elements of credit and interest rate risk to varying degrees. The Company’s exposure to credit loss in the event of nonperformance by the other party to the instrument is represented by the instrument’s contractual amount. To control this credit risk, the Company uses the same underwriting standards as it uses for loans recorded on the balance sheet. The amounts of financial instruments with off-balance-sheet risk are as follows: December 31, 2021 2020 (Dollars in thousands) Loan commitments $ 2,084,706 $ 1,779,857 Stand-by letters of credit 82,841 96,311 Loan commitments are agreements to lend to a customer, as long as there is no violation of any condition established in the contract. Stand-by letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These instruments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the instruments are expected to expire without being drawn upon, the total amounts do not necessarily represent commitments that will be funded in the future. The Company is a defendant in legal actions arising from normal business activities. Management believes that all legal actions against the Company are without merit or that the ultimate liability, if any, resulting from them will not materially affect the Company’s financial statements.

Leases

Leases	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases	(20) LEASES Lessee The Company has operating leases, which primarily consist of office space in buildings, ATM locations, storage facilities, parking lots, equipment and land on which it owns certain buildings. Rental expense on all operating leases, including those rented on a monthly or temporary basis were as follows (Dollars in thousands): Year Ending December 31: 2021 $ 1,560 2020 1,894 2019 1,633 A right of use lease asset included in accrued interest receivable and other assets on the balance sheet totaled $ 5.0 million at December 31, 2021 compared to $ 4.4 million at December 31, 2020 , and a related lease liability included in accrued interest payable and other liabilities on the balance sheet totaled $ 4.9 million at December 31, 2021 compared to $ 4.3 million at December 31, 2020. As of December 31, 2021 , our operating leases have a weighted-average remaining lease term of 3.5 years and a weighted-average discount rate of 2.6 percent. Maturity of Operating Lease Liabilities The following table presents minimum future commitments by year for the Company’s operating leases. Such commitments are reflected as undiscounted values and are reconciled to the discounted present value recognized on the balance sheet. December 31, 2021 (Dollars in thousands) 2022 $ 1,405 2023 1,027 2024 664 2025 608 2026 508 Thereafter 1,396 Total lease payments 5,608 Less imputed interest ( 732 ) Operating lease liability $ 4,876 Lessor The Company is a lessor of operating leases, which primarily consist of office space in buildings and parking lots. These assets are classified on the balance sheet as premises and equipment. The Company had operating lease revenue of $ 4.9 million, $ 5.3 million and $ 6.1 million for the years ended December 31, 2021, 2020 and 2019, respectively. Lease revenue is included in occupancy, net on the consolidated statement of comprehensive income. Future Minimum Lease Payments to be received The Company does not have operating leases that extend beyond 2030. The following table presents the scheduled minimum future contractual rent to be received under the remaining non-cancelable term of the operating leases: December 31, 2021 (Dollars in thousands) 2022 $ 3,375 2023 2,636 2024 2,574 2025 1,946 2026 1,547 2027-2030 2,921 Total future minimum lease payments $ 14,999

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	(21) 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 management judgment or estimation. This category includes certain collaterally dependent loans, impaired 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) December 31, 2021 Debt securities available for sale: U.S. Treasury $ 457,628 $ — $ — $ 457,628 U.S. federal agencies — 21,942 — 21,942 Mortgage-backed securities — 29,283 — 29,283 States and political subdivisions — 5,999 320 6,319 Asset backed securities — 13,357 — 13,357 Other debt securities — 2,994 — 2,994 Derivative assets — 8,946 — 8,946 Derivative liabilities — 8,237 — 8,237 December 31, 2020 Debt securities available for sale: U.S. Treasury $ 475,236 $ — $ — $ 475,236 U.S. federal agencies — 19,638 — 19,638 Mortgage-backed securities — 15,696 — 15,696 States and political subdivisions — 28,793 155 28,948 Asset backed securities — — 12,714 12,714 Derivative assets — 991 — 991 Derivative liabilities — 872 — 872 The changes in Level 3 assets measured at estimated fair value on a recurring basis during the periods presented were as follows: Twelve Months Ended 2021 2020 (Dollars in thousands) Balance at the beginning of the year $ 12,869 $ 12,714 Transfers (to)/from level 2 ( 12,714 ) 1,643 Purchases 240 — Settlements ( 75 ) ( 1,473 ) Total unrealized losses — ( 15 ) Balance at the end of the period $ 320 $ 12,869 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 year ended December 31, 2021, the Company transferred debt securities from Level 3 to Level 2 due to a review of the pricing models that determined some asset backed debt securities to be Level 2. During the year ended December 31, 2020, the Company transferred debt securities from Level 2 to Level 3 due to a review of the pricing models that determined some state and political subdivisions bonds to be Level 3. 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 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 management 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. The fair value represents end of period values, which approximate fair value measurements that occurred on various measurement dates throughout the period: Total Fair Value (Dollars in thousands) As of and for the Year-to-date Period Ended December 31, 2021 Equity securities $ 10,590 Collateral dependent loans 13,195 Repossessed assets 78 Other real estate owned 7,496 As of and for the Year-to-date Period Ended December 31, 2020 Equity securities $ 10,098 Collateral dependent loans 11,347 Repossessed assets 291 Other real estate owned 32,066 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 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 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. At December 31, 2020, the Company’s principal subsidiary bank, BancFirst, had approximately $ 21.6 million in loans at its Hugo, Oklahoma branch that it had entered into an agreement to sell to AmeriState Bank in Atoka, Oklahoma. Loans To determine the fair value of loans, 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. T he 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: December 31, 2021 2020 Carrying Fair Value Carrying Fair Value (Dollars in thousands) FINANCIAL ASSETS Level 2 inputs: Cash and cash equivalents $ 2,050,022 $ 2,050,022 $ 1,616,912 $ 1,616,912 Federal funds sold 800 800 — — Debt securities held for investment 32 33 59 62 Loans held for sale 24,776 24,776 53,719 53,719 Level 3 inputs: Debt securities held for investment 2,945 2,945 2,905 2,922 Loans, net of allowance for credit losses 6,085,506 6,059,716 6,303,140 6,347,803 FINANCIAL LIABILITIES Level 2 inputs: Deposits 8,091,914 8,161,553 8,064,704 8,084,695 Short-term borrowings — — 1,100 1,100 Subordinated debt 85,987 90,391 26,804 30,535 OFF-BALANCE SHEET FINANCIAL INSTRUMENTS Loan commitments 3,648 3,115 Letters of credit 621 722 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, of which there was none as of December 31, 2021 or 2020. 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 December 31, 2021 or 2020.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	(22) 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. 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: December 31, 2021 2020 Oil and Natural Gas Swaps and Options Notional Units Notional Estimated Notional Estimated (Notional amounts and dollars in thousands) Oil Derivative assets Barrels 2,585 $ 6,563 50 $ 53 Derivative liabilities Barrels ( 2,585 ) ( 6,129 ) ( 50 ) ( 43 ) Natural Gas Derivative assets MMBTUs 19,752 2,383 4,663 938 Derivative liabilities MMBTUs ( 19,752 ) ( 2,108 ) ( 4,663 ) ( 829 ) Total Fair Value Included in Derivative assets Other assets 8,946 991 Derivative liabilities Other liabilities ( 8,237 ) ( 872 ) The following table is a summary of the Company’s recognized income related to the activity, which was included in other noninterest income: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Derivative income $ 266 $ 50 $ 3 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 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: December 31, 2021 2020 (Dollars in thousands) Credit exposure $ — $ 965 Balance Sheet Offsetting Derivatives may be eligible for offset in the consolidated balance sheet and/or subject to master netting arrangements. The Company’s derivative transactions with upstream financial institution counterparties and bank customers are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements, which include “right of set-off” provisions. In such cases there is generally a legally enforceable right to offset recognized amounts and there may be an intention to settle such amounts on a net basis. Nonetheless, the Company does not generally offset such financial instruments for financial reporting purposes.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Segment Information	(23) 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 five principal business units are metropolitan banks, community banks, Pegasus Bank, other financial services and executive, operations and support. Metropolitan banks, community banks and Pegasus Bank offer traditional banking products such as commercial and retail lending, and a full line of deposit accounts. Metropolitan banks consist of banking locations in the metropolitan Oklahoma City and Tulsa areas. Community banks consist of banking locations in communities throughout Oklahoma. Pegasus Bank consists of banking locations in the Dallas metropolitan area. 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 five business units are as follows: Metropolitan Community Pegasus Other Executive, Eliminations Consolidated (Dollars in thousands) December 31, 2021 Net interest income $ 77,840 $ 180,925 $ 24,222 $ 35,244 $ ( 3,295 ) $ 721 $ 315,657 Provision for/(benefit from) credit losses ( 5,474 ) ( 4,694 ) 1,395 109 ( 26 ) — ( 8,690 ) Noninterest income 23,257 65,600 1,448 47,124 203,005 ( 170,402 ) 170,032 Depreciation and amortization 2,593 10,483 782 557 5,626 — 20,041 Other expenses 39,356 110,574 15,317 60,435 41,199 ( 941 ) 265,940 Income before taxes $ 64,622 $ 130,162 $ 8,176 $ 21,267 $ 152,911 $ ( 168,740 ) $ 208,398 Total assets $ 2,627,874 $ 5,821,220 $ 1,045,699 $ 71,694 $ 1,201,974 $ ( 1,362,849 ) $ 9,405,612 Capital expenditures $ 1,612 $ 7,390 $ 363 $ 400 $ 17,486 $ — $ 27,251 December 31, 2020 Net interest income $ 85,464 $ 175,757 $ 21,360 $ 23,500 $ 79 $ 508 $ 306,668 Provision for credit losses 30,202 29,827 1,916 562 141 — 62,648 Noninterest income 18,664 60,386 1,071 41,549 118,491 ( 102,939 ) 137,222 Depreciation and amortization 2,639 10,603 760 500 3,922 — 18,424 Other expenses 36,746 111,341 13,831 44,918 33,588 ( 1,118 ) 239,306 Income before taxes $ 34,541 $ 84,372 $ 5,924 $ 19,069 $ 80,919 $ ( 101,313 ) $ 123,512 Total assets $ 2,729,886 $ 5,527,611 $ 919,572 $ 137,122 $ 1,073,507 $ ( 1,175,341 ) $ 9,212,357 Capital expenditures $ 1,087 $ 9,946 $ 1,775 $ 450 $ 53,188 $ — $ 66,446 December 31, 2019 Net interest income $ 86,511 $ 177,330 $ 8,657 $ 5,763 $ 3,660 $ — $ 281,921 Provision for credit losses 2,143 5,606 140 ( 69 ) 467 — 8,287 Noninterest income 18,608 64,485 483 40,270 152,320 ( 138,937 ) 137,229 Depreciation and amortization 2,463 10,218 274 603 2,431 — 15,989 Other expenses 37,549 109,044 4,939 25,408 50,941 ( 2,569 ) 225,312 Income before taxes $ 62,964 $ 116,947 $ 3,787 $ 20,091 $ 102,141 $ ( 136,368 ) $ 169,562 Total assets $ 2,806,021 $ 4,998,247 $ 738,351 $ 102,442 $ 950,920 $ ( 1,030,223 ) $ 8,565,758 Capital expenditures $ 4,349 $ 11,219 $ 83 $ 1,220 $ 10,183 $ — $ 27,054 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. Capital expenditures are generally charged to the business unit using the asset.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Event	(24) SUBSEQUENT EVENT On January 10, 2022, the Company purchased United States Treasury Notes of $ 600 million par value with an average yield of 1.42 % and an average maturity of 53 months . The effect of this purchase was included in the consolidated financial statements of the Company from the date of purchase forward. On February 8, 2022, BancFirst Corporation acquired Worthington National Bank (“Worthington”), for an aggregate cash purchase price of $ 77.7 million. Worthington is chartered and regulated by the Office of the Comptroller of the Currency (OCC), with one banking location in Arlington, Texas, one in Colleyville, Texas and two in Fort Worth, Texas. At acquisition, Worthington had approximately $ 470.3 million in total assets, $ 260.9 million in loans and $ 429.9 million in deposits. Worthington will continue to operate as “Worthington National Bank” and will remain a wholly-owned subsidiary of BancFirst Corporation. BancFirst Corporation 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 their assets. The initial accounting for the business combination is not complete due to limited time since the acquisition date. The acquisition did not have a material effect on the Company's consolidated financial statements.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations BancFirst Corporation is an Oklahoma business corporation and a financial holding company under federal law. It conducts virtually all of its operating activities through its principal wholly-owned subsidiary, BancFirst (“BancFirst”), an Oklahoma state-chartered bank headquartered in Oklahoma City, Oklahoma. The Company also conducts operating activities through its wholly-owned subsidiary, Pegasus Bank (“Pegasus Bank”), a Texas state-chartered bank headquartered in Dallas, Texas. BancFirst and Pegasus Bank provide a wide range of retail and commercial banking services, including: commercial, real estate, agricultural and consumer lending; depository and funds transfer services; collections; safe deposit boxes; cash management services; and other services tailored for both individual and corporate customers. BancFirst also offers trust services and acts as executor, administrator, trustee, transfer agent and in various other fiduciary capacities. Through its Technology and Operations Center, BancFirst provides item processing, research and other correspondent banking services to financial institutions and governmental units. The Company’s wholly-owned subsidiary, BancFirst Insurance Services, Inc., an independent insurance agency, offers a variety of commercial and personal insurance products. In addition, the Company’s wholly-owned subsidiary, Council Oak Partners, LLC, an Oklahoma limited liability company, engages in investing activities.
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of BancFirst Corporation, Council Oak Partners, LLC, BancFirst Insurance Services, Inc., BancFirst Risk & Insurance Company (2019 and 2020 consolidated financials include a full year of operations for BancFirst Risk & Insurance Company; however it was dissolved as of December 31, 2020), Pegasus Bank, and BancFirst and its subsidiaries. The principal operating subsidiaries of BancFirst are Council Oak Investment Corporation, Council Oak Real Estate Inc., BFTower, LLC, BFC-PNC LLC, BF Brazito, 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 consolidated financial statements. Certain amounts from 2020 and 2019 have been reclassified to conform to the 2021 presentation. These reclassifications were not material to the Company’s financial statements.
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 U.S. GAAP 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 intangibles. Such estimates and assumptions may change over time and actual amounts realized may differ from those reported.
Securities	Securities The Company invests in debt securities. Any sales of debt securities are for the purpose of executing the Company’s asset/liability management strategy, eliminating a perceived credit risk in a specific security or providing liquidity. Debt securities that are being held for indefinite periods of time, or that may be sold as part of the Company’s asset/liability management strategy, to provide liquidity or for other reasons, are classified as available for sale and are stated at estimated fair value. Unrealized gains or losses on debt securities available for sale are reported as a component of stockholders’ equity, net of income tax. Gains or losses from sales of debt securities are based upon the book values of the specific debt securities sold. Debt securities for which the Company has the intent and ability to hold to maturity are classified as held for investment and are stated at cost, adjusted for amortization of premiums and accretion of discounts computed under the interest method. The Company reviews its portfolio of debt securities in an unrealized loss position at least quarterly. The Company first assesses whether it intends to sell or it is more-likely-than-not that it will be required to sell the securities before recovery of the amortized cost basis. If either of these criteria is met, the securities amortized cost basis is written down to fair value as a current period expense. If either of the above criteria is not met, the Company evaluates whether the decline in fair value is the result of credit losses or other factors. In making this assessment, the Company considers, among other things, the period of time the security has been in an unrealized loss position, and performance of any underlying collateral and adverse conditions specifically related to the security. The Company does not consider the unrealized position of its debt securities to be the result of credit factors, because the decline in fair value is attributable to changes in interest rates and illiquidity, and not credit quality, and the Company does not have the intent to sell these securities and it is likely that it will not be required to sell the securities before their anticipated recovery. Therefore, the Company has not recorded an allowance for credit losses against its debt securities portfolio, as the credit risk is not material. The Company does not engage in securities trading activities. The Company invests in equity securities without readily determinable fair values and utilizes Level 3 inputs. These 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. Equity securities are reported in other assets on the balance sheet. The Company reviews its portfolio of equity securities for impairment at least quarterly. Prior to the adoption of Accounting Standards Codification ("ASC") 326, declines in the fair value of held-to-maturity and available-for-sale securities below their cost that were deemed to be other than temporary were reflected in earnings as realized losses. In estimating other-than-temporary impairment losses prior to January 1, 2020, management considered, among other things, (i) the length of time and the extent to which the fair value had been less than cost, (ii) the financial condition and near-term prospects of the issuer and (iii) the intent and our ability to retain our investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.
Loans	Loans The lending function is governed by written policies and procedures, as determined by senior management and approved by the Board of Directors. The policies and procedures set the standards for lending in each major loan category by collateral type and use of loan proceeds. The objectives of these policies and procedures are to identify profitable markets, determine appropriate risk tolerance levels for each type of loan, establish limits for loan officer approval, set concentration limits, establish loan-to-value thresholds, set repayment terms and loan structure guidelines and adhere to documentation requirements. Interest rate risk is controlled by the use of variable rate provisions, the vast majority of which have a rate floor, limits on fixing rates for longer periods and the use of prepayment penalties. Loans originated within the Company are stated at the principal amount outstanding, net of unearned interest, loan fees and allowance for credit losses. Interest on all performing loans is recognized, on a simple interest basis, based upon the principal amount outstanding. See Note (5) for loan disclosures. Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts. The Company has made the accounting policy election to exclude accrued interest receivable on loans from the estimate of credit losses. Interest income is accrued on the unpaid principal balance using the simple-interest method on the daily balances of the principal amounts outstanding. Interest income on consumer and commercial loans is discontinued and placed on nonaccrual status at the time the loan is 90 days delinquent unless the loan is well secured and in process of collection. Consumer loans are charged off at 180 days past due and commercial loans are charged off to the extent principal or interest is deemed uncollectible. Past-due status is based on the contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal or interest is considered doubtful. All interest accrued but not received for loans placed on nonaccrual is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Under the cost-recovery method, interest income is not recognized until the loan balance is reduced to zero. Under the cash-basis method, interest income is recorded when the payment is received in cash. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Troubled debt restructurings are loans on which, due to the borrower’s financial difficulties, the Company has granted a concession that the Company would not otherwise consider for borrowers of similar credit quality. This may include a transfer of real estate or other assets from the borrower, a modification of loan terms, or a combination of the two. Modifications of terms that could potentially qualify as a restructuring include reduction of contractual interest rate, extension of the maturity date at a contractual interest rate lower than the current rate for new debt with similar risk, and a reduction of the face amount of debt or forgiveness of either principal or accrued interest. A loan continues to qualify as restructured until a consistent payment history or change in the borrower’s financial condition has been evidenced, generally for no less than twelve months. If the restructuring agreement specifies an interest rate at the time of the restructuring that is greater than or equal to the rate that the Company is willing to accept for a new extension of credit with comparable risk, then the loan is no longer considered a restructured loan if it is in compliance with the modified terms in calendar years after the year of restructure. Residential real estate loans are made in accordance with underwriting policies and are fully documented. Credit worthiness is assessed based on significant credit characteristics including credit history and residential and employment stability. The Company does not engage in any hybrid loan programs. In addition, the Company does not have any exposure to loans with negative amortization, interest rate carryover or discounting of the initial rates (teaser rates). An updated appraisal of the collateral is obtained when a loan is first identified as a problem loan. Appraisals are reviewed annually and are updated as needed, or are updated more frequently if significant changes are believed to have occurred in the collateral or market conditions. Appraisals of other real estate owned are also reviewed and updated consistent with this policy. When a loan deteriorates to the point that the account officer or the Loan Committee concludes it no longer represents a viable asset, it will be charged off. Similarly, any portion of a loan that is deemed to no longer be a viable asset will be charged off. A loan will not be charged off unless such action has been approved by the branch President.
Acquired Loans	Acquired Loans Loans acquired through business combinations are required to be carried at fair value as of the date of the combination. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date. The methodology of allowance for credit loss recorded for these acquired loans depends on whether the acquired loans are purchase credit deteriorated or non-purchase credit deteriorated. An allowance for credit loss for non-purchase credit deteriorated loans is determined and recorded in a manner consistent with originated loans. That is, the allowance for credit loss is calculated based on the loan’s amortized cost basis (i.e., the acquisition date fair value in a business combination) and is established through a charge to provision expense at the acquisition date. An allowance for credit loss for purchase credit deteriorated loans is recorded as an adjustment to the loans, in addition to the fair value amount recorded, as of the acquisition date, and not through provision expense. The acquisition date fair value plus the allowance for credit loss equals the loans new amortized cost basis as of the acquisition date. The difference between the new amortized cost basis and the unpaid principal balance of the loan represents the non-credit purchase discount/premium recorded. The difference between the fair value of loans which do not have specific evidence of deterioration of credit quality since origination and their principal balance is recognized in interest income on a level-yield method over the life of the loans. For loans which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments (as determined by the present value of expected future cash flows), the difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” is recognized in interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as yield adjustments or as loss accruals or valuation allowances. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows are recognized as impairments. Any probable loss due to subsequent credit deterioration of the loans since acquisition is provided for in the allowance for credit losses.
Purchased Credit Deteriorated (PCD) Loans	Purchased Credit Deteriorated (PCD) Loans The Company has purchased loans, some of which have experienced more than insignificant credit deterioration since origination. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through provision expense.
Loans Held For Sale	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 the 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 carried at the lower of cost or fair value. Gains or losses recognized upon the sale of the loans are determined on a specific identification basis. The Company does not sell residential mortgage loans with recourse other than obligations under standard representations and warranties or for fraud. These obligations relate to loan performance for the life of the loan. The amount of loans repurchased since the inception of the program is not considered to be material, and therefore, no reserve has been required. At December 31, 2020, loans held for sale included loans at its Hugo, Oklahoma branch that it had entered into an agreement to sell to AmeriState Bank in Atoka, Oklahoma.
Allowance for Credit Losses	Allowance for Credit Losses The allowance for credit losses is a valuation account that is deducted from the loans amortized cost basis to present the net amount expected to be collected on the loans. Loans are charged off against the allowance when management believes the uncollectibility of a loan balance is confirmed. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. The allowance for credit losses is increased by provisions charged to operating expense and is reduced by net loan charge-offs. The Company considers various factors to monitor the credit risk in the loan portfolio including volume and severity of loan delinquencies, nonaccrual loans, internal grading of loans, historical loan loss experience and economic conditions. Management estimates the allowance balance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, or term as well as for changes in environmental conditions, such as the political, legal, and regulatory environment, technology and consumer preferences. Historical loss information is also adjusted for reasonable and supportable changes in national and local economic conditions, such as consumer loans 90 days past due and commercial bankruptcies. Economic conditions are forecast as "current conditions" over the forecast period. Forecast models were used to validate credit performance during the forecast period. Beyond the reasonable and supportable forecast, the economic expectation reverts to the historical average, which is determined by the weighted average life of each loan pool. If a loan is individually evaluated a specific allowance is provided, if necessary, so that the loan is reported net, at the fair value of collateral. Interest payments on collateral dependent loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis. Loans, or portions thereof, are charged off when deemed uncollectible. The allowance for credit losses is measured on a collective (pool) basis when similar risk characteristics exist.
Determining the Contractual Term	Determining the Contractual Term Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by the Company.
Troubled Debt Restructurings (TDRs)	Troubled Debt Restructurings (TDRs) The allowance for credit loss on a TDR is measured using the same method as all other loans held for investment, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the allowance for credit loss is determined by discounting the expected future cash flows at the original interest rate of the loan.
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures	Allowance for Credit Losses on Off-Balance Sheet Credit Exposures The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on off-balance sheet credit exposures is adjusted as a provision for credit loss expense. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. Based on a low likelihood that funding will occur and the Company’s ability to manage the extension of credit to our borrowers, the allowance for credit losses on off-balance sheet credit exposure is not material.
Allowance for Credit Losses on Available-for-Sale Debt Securities	Allowance for Credit Losses on Available-for-Sale Debt Securities The Company reviews its portfolio of debt securities in an unrealized loss position at least quarterly. The Company first assesses whether it intends to sell or it is more-likely-than-not that it will be required to sell the securities before recovery of the amortized cost basis. If either of these criteria is met, the securities amortized cost basis is written down to fair value as a current period expense. If either of the above criteria is not met, the Company evaluates whether the decline in fair value is the result of credit losses or other factors. In making this assessment, the Company considers, among other things, the period of time the security has been in an unrealized loss position, and performance of any underlying collateral and adverse conditions specifically related to the security. At December 31, 2021 and December 31, 2020 approximately 95 % of the available for sale debt securities held by the Company were issued by the U.S. Treasury, or U.S. government-sponsored entities and agencies. The Company does not consider the unrealized loss position of these securities to be the result of credit factors, because the decline in fair value is attributable to changes in interest rates and illiquidity, and not credit quality, and the Company does not have the intent to sell these securities and it is likely that it will not be required to sell the securities before their anticipated recovery. Therefore, the Company has not recorded an allowance for credit losses against its debt securities portfolio, as the credit risk is not material.
PPP Fee Income Policy	PPP Fee Income Policy The Paycheck Protection Program (“PPP”) , established as part of the Coronavirus Aid, Relief and Economic Security (“CARES”) Act, provides that the Small Business Administration ("SBA") will pay processing fees of up to 5 % to lenders based on the volume of the PPP loans disbursed. The fee is based on the balance of each PPP loan outstanding at the time of full disbursement. The Company had received processing fees from the SBA of approximately $ 23.8 million in 2021 and $ 30.2 million in 2020. The unamortized balance of these fees on each loan is reported on the Company's balance sheet as part of the loan balance to which it relates and is recognized over the remaining life of the loan as an adjustment of yield. The unamortized balances of these fees was approximately $ 2.0 million and $ 14.5 million for the year ended December 31, 2021 and 2020, respectively. Upon notification from the SBA of the amount of the PPP loan to be forgiven the acceleration of recognition of deferred loan fee will occur for the percentage of the loan forgiven.
Nonaccrual Policy	Nonaccrual Policy A loan is placed on nonaccrual status when, in the opinion of management, the future collectability of both interest and principal is not probable. When interest accrual is discontinued, all unpaid accrued interest is reversed. Interest income is recognized on certain of these loans on a cash basis if the full collection of the remaining principal balance is reasonably expected. Otherwise, interest income is not recognized until the principal balance is fully collected. The Company does not accrue interest on (1) any loan upon which a default of principal or interest has existed for a period of 90 days or over unless the collateral margin or guarantor support are such that full collection of principal and interest are not in doubt, and an orderly plan for collection is in process; and (2) any other loan for which it is expected full collection of principal and interest is not probable. A nonaccrual loan may be restored to an accrual status when none of its principal and interest are past due and unpaid or otherwise becomes well secured and in the process of collection and when prospects for collection of future contractual payments are no longer in doubt. With the exception of a formal debt forgiveness agreement, no loan which has had principal charged-off shall be restored to accrual status unless the charged-off principal has been recovered.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost, less accumulated depreciation. Depreciation is charged to operating expense and is computed using the straight-line method over the estimated useful lives of the assets. Maintenance and repairs are charged to expense as incurred while improvements are capitalized. Premises and equipment is tested for impairment if events or changes in circumstances occur that indicate that the carrying amount of any premises and equipment may not be recoverable. Impairment losses are measured by comparing the fair values of the premises and equipment with their recorded amounts. Premises that are identified to be sold are transferred to other real estate owned at the lower of their carrying amounts or their fair values less estimated costs to sell. Any losses on premises identified to be sold are charged to operating expense. When premises and equipment are transferred to other real estate owned, sold, or otherwise retired, the cost and applicable accumulated depreciation are removed from the respective accounts and any resulting gains or losses are reported in the statement of comprehensive income. Construction in progress includes all the costs of construction associated with the building of fixed long-term assets and is included in premises and equipment, net as an asset. When construction is completed, the asset is reclassified as a building or a leasehold improvement and depreciated over its applicable useful life.
Leases	Leases Certain operating leases are included as right of use lease assets in accrued interest receivable and other assets on the balance sheet and a related lease liability is included in accrued interest payable and other liabilities on the balance sheet. Right of use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. The lease liability is measured as the present value of the unpaid lease payments, and the right of use assets value is derived from the calculation of the lease liability. To calculate the discount rate for each lease, the Company uses the rate implicit in the lease if available, otherwise an appropriate Federal Home Loan Bank ("FHLB") advance borrowing rate is used that correlates with the term of the lease.
Other Real Estate Owned	Other Real Estate Owned Other real estate owned ("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. Losses arising at the time of reclassification of such properties from loans to OREO are charged directly to the allowance for credit losses. Any losses on premises identified to be sold are charged to operating expense at the time of transfer from premises to OREO. Losses from declines in value of the properties subsequent to classification as OREO are charged to operating expense. Revenues and expenses for OREO property are included in the income statement for the period in which they occur. Gross rental income for OREO is included in other non-interest income. The expenses of operating or holding OREO property are included in noninterest expense.
Intangible Assets and Goodwill	Intangible Assets and Goodwill Core deposit intangibles are amortized on a straight-line basis over the estimated useful lives of seven to ten years and customer relationship intangibles are amortized on a straight-line basis over the estimated useful life of three to eighteen years . Goodwill is not amortized, but is evaluated at a reporting unit level at least annually for impairment, or more frequently if other indicators of impairment are present. At least annually in the fourth quarter, intangible assets are evaluated for possible impairment. Impairment losses are measured by comparing the fair values of the intangible assets with their recorded amounts. Any impairment losses are reported in the statement of comprehensive income.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred. Advertising costs for the year ended December 31, 2021 were $ 3.0 million. Advertising costs for the years ended December 31, 2020 and 2019 were $ 3.3 million and $ 3.8 million, respectively.
Stock-based Compensation	Stock-based Compensation The Company recognizes stock-based compensation as compensation expense in the statement of comprehensive income based on the fair value of the Company’s stock options on the measurement date, which, for the Company, is the date of the grant. 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.
Income Taxes	Income Taxes The Company files a consolidated income tax return with its subsidiaries. Federal and state income tax expense or benefit has been allocated to subsidiaries on a separate return basis. Deferred taxes are recognized under the balance sheet method based upon the future tax consequences of temporary differences between the carrying amounts and tax basis of assets and liabilities, using the tax rates expected to apply to taxable income in the periods when the related temporary differences are expected to be realized. Realization of deferred tax assets is dependent upon the generation of a sufficient level of future taxable income and recoverable taxes paid in prior years. Although realization is not assured, management believes it is more likely than not that all of the deferred tax assets will be realized.
Earnings Per Common Share	Earnings Per Common Share Basic earnings per common share is computed by dividing net income, less any preferred dividends requirement, by the weighted average of common shares outstanding. Diluted earnings per common share reflects the potential dilution that could occur if options, convertible securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company.
Revenue Recognition	Revenue Recognition In addition to lending and related activities, the Company offers various services to customers that generate revenue. Contract performance typically occurs in one year or less. Incremental costs of obtaining a contract are expensed when incurred when the amortization period is one year or less. Sales of real estate The sale of real estate property is generally recognized, along with any associated gain or loss, when control of the property transfers to the buyer. Service and transaction fees on depository accounts Customers often pay certain fees to the bank to access the cash on deposit including certain non-transactional fees such as account maintenance or dormancy fees, and certain transaction based fees such as non-sufficient funds fees, overdraft, ATM, wire transfer, or foreign exchange fees. Revenue is recognized when the transactions occur or as services are performed over primarily monthly or quarterly periods. Payment is typically received in the period the transactions occur, or in some cases, within 90 days of the service period. Interchange Fees Interchange fees, or “swipe” fees, are charges that merchants pay to the processors who, in turn, share that revenue with us and other card-issuing banks for processing electronic payment transactions. Interchange fees represent the portion of the debit card transaction amount that the card issuer retains to compensate it for processing transactions and providing rewards. Interchange fees are settled and recognized on a daily or monthly basis. Insurance Commissions and Fees Insurance commissions are received on the sale of insurance products, and revenue is recognized upon the placement date of the insurance policies or when such commissions are received. Payment is normally received within the policy period. In addition to placement, the Company also provides insurance policy related risk management services. Revenue is recognized as these services are provided. Performance-based commissions are recognized when received or earlier when, upon consideration of past results and current condition, the revenue is deemed not probable of reversal. For accounts billed by BancFirst Insurance Services, Inc., commission revenue is recognized at the later of the billing date or the effective date of the related insurance policies. Commission revenue, for accounts that are directly billed by the insurance company to the insured, is recognized when determinable by BancFirst Insurance Services, Inc., which is generally when such commissions are received. BancFirst Insurance Services, Inc. also receives contingent commissions from insurance companies as additional incentive for achieving specified premium volume goals and/or loss experience parameters relating to the insurance they place. Contingent commissions from insurance companies are recognized when determinable, which is generally when such commissions are received. Trust BancFirst offers trust services and acts as executor, administrator, trustee, transfer agent and in various other fiduciary capacities. There are four basic types of fees that are included in the trust department income. Administrative fees are assessed for managing trust accounts. Shareholder fees are received in connection with holding specific fund share classes. In return for these services, the mutual fund (or its distributor or investment advisor) pay a fee to BancFirst. Oil and gas fees are assessed for management of oil and gas related activities. There are also other types of fees charged on a one time basis such as those related to opening and closing trust accounts. BancFirst records trust fees on a monthly, quarterly or annual basis based on the size of the asset being managed. Fees may be fixed or, where applicable, based on a percentage of transaction size of managed assets. These fees are recorded as revenue at the time the fee is billed, according to the agreement with the customer.
Comprehensive Income	Comprehensive Income Comprehensive income includes all changes in stockholders’ equity during a period, except those resulting from transactions with stockholders. Besides net income, other components of the Company’s comprehensive income includes the after tax effect of changes in the net unrealized gain/loss on debt securities available for sale. The Company’s policy is to release material stranded tax effects included in accumulated other comprehensive income on a specific identification basis.
Statement of Cash Flows	Statement of Cash Flows For purposes of the statement of cash flows, the Company considers cash and due from banks and interest-bearing deposits with banks as cash equivalents.

Cash, Due from Banks, Interes_2

Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold (Tables)	12 Months Ended
	Dec. 31, 2021
Cash and Cash Equivalents [Abstract]
Summary of Vault Cash and Funds on Deposit with Federal Reserve Bank	The Company maintained vault cash and funds on deposit with the Federal Reserve Bank, which is included in the following table: December 31, 2021 2020 (Dollars in thousands) Vault cash and funds on deposit with the Federal Reserve Bank $ 1,907,482 $ 1,429,410

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment	The following table summarizes the amortized cost and estimated fair values of debt securities held for investment: Amortized Gross Gross Estimated (Dollars in thousands) December 31, 2021 Mortgage backed securities (1) $ 32 $ 1 $ — $ 33 States and political subdivisions 2,445 — — 2,445 Other securities 500 — — 500 Total $ 2,977 $ 1 $ — $ 2,978 December 31, 2020 Mortgage backed securities (1) $ 59 $ 3 $ — $ 62 States and political subdivisions 2,405 18 ( 1 ) 2,422 Other securities 500 — — 500 Total $ 2,964 $ 21 $ ( 1 ) $ 2,984
Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale	The following table summarizes the amortized cost and estimated fair values of debt securities available for sale: Amortized Gross Gross Estimated (Dollars in thousands) December 31, 2021 U.S. treasuries $ 455,701 $ 3,693 $ ( 1,766 ) $ 457,628 U.S. federal agencies 21,609 335 ( 2 ) 21,942 Mortgage backed securities (1) 28,897 400 ( 14 ) 29,283 States and political subdivisions 6,128 194 ( 3 ) 6,319 Asset backed securities 13,354 3 — 13,357 Other securities 3,000 — ( 6 ) 2,994 Total $ 528,689 $ 4,625 $ ( 1,791 ) $ 531,523 December 31, 2020 U.S. treasuries $ 465,416 $ 9,820 $ — $ 475,236 U.S. federal agencies 19,697 1 ( 60 ) 19,638 Mortgage backed securities (1) 15,268 428 — 15,696 States and political subdivisions 28,571 377 — 28,948 Asset backed securities 13,337 — ( 623 ) 12,714 Total $ 542,289 $ 10,626 $ ( 683 ) $ 552,232 (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. December 31, 2021 2020 Amortized Estimated Amortized Estimated (Dollars in thousands) Held for Investment Contractual maturity of debt securities: Within one year $ 577 $ 577 $ 807 $ 809 After one year but within five years 2,396 2,397 2,091 2,110 After five years but within ten years 4 4 65 64 After ten years — — 1 1 Total $ 2,977 $ 2,978 $ 2,964 $ 2,984 Available for Sale Contractual maturity of debt securities: Within one year $ 58,478 $ 58,688 $ 339,752 $ 341,102 After one year but within five years 408,253 410,049 162,401 171,135 After five years but within ten years 10,851 11,011 3,753 3,910 After ten years 51,107 51,775 36,383 36,085 Total debt securities $ 528,689 $ 531,523 $ 542,289 $ 552,232
Company's Book Value of Pledged Debt Securities	The following table is a summary of the Company’s book value of debt securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law: December 31, 2021 2020 (Dollars in thousands) Book value of pledged securities $ 473,026 $ 490,833
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 December 31, 2021 and 2020 respectively: Less than 12 Months More than 12 Months Total Estimated Unrealized Estimated Unrealized Estimated Unrealized (Dollars in thousands) December 31, 2021 Available for Sale U.S. treasuries $ 298,080 $ 1,766 $ — $ — $ 298,080 $ 1,766 U.S. federal agencies 376 2 — — 376 2 Mortgage backed securities 2,824 14 — — 2,824 14 States and political subdivisions 505 3 — — 505 3 Other securities 2,994 6 — — 2,994 6 Total $ 304,779 $ 1,791 $ — $ — $ 304,779 $ 1,791 December 31, 2020 Held for Investment States and political subdivisions $ 119 $ 1 $ — $ — $ 119 $ 1 Total $ 119 $ 1 $ — $ — $ 119 $ 1 Available for Sale U.S. federal agencies $ 12,236 $ 41 $ 2,184 $ 19 $ 14,420 $ 60 Asset backed securities — — 12,714 623 12,714 623 Total $ 12,236 $ 41 $ 14,898 $ 642 $ 27,134 $ 683

Loans Held for Investment and_2

Loans Held for Investment and Allowance for Credit Losses on Loans (Tables)	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Summary of Loans Held for Investment by Portfolio Segment	Loans held for investment are summarized by portfolio segment as follows: December 31, 2021 2020 Amount Amount (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 684,739 $ 659,762 Commercial real estate non-owner occupied 1,095,324 1,050,739 Construction and development < 60 months 415,466 275,096 Construction residential real estate < 60 months 254,524 230,193 Residential real estate first lien 937,006 930,576 Residential real estate all other 161,018 172,883 Farmland 272,179 254,330 Commercial and agricultural non-real estate 1,256,487 1,193,719 Consumer non-real estate 413,370 376,264 Oil and gas 428,908 428,866 Other loans (2) 250,421 822,078 Total loans (1) $ 6,169,442 $ 6,394,506 (1) Excludes accrued interest receivable of $ 21.0 million at December 31, 2021 and $ 26.0 million at December 31, 2020, that is recorded in accrued interest receivable and other assets. (2) Includes PPP loans held for investment of $ 80.4 million, net of unamortized processing fees of $ 2.0 million at December 31, 2021 and $ 652.7 million, net of unamortized processing fees of $ 14.5 million at December 31, 2020.
Schedule of Portfolio Segments Weighted Average Life, and Measures the Allowance for Credit Losses	The Company has identified the following portfolio segments, which includes the applicable weighted average remaining life, and measures the allowance for credit losses using the vintage loss analysis adjusted for qualitative factors: Portfolio Segments Life (in years) Real estate: Commercial real estate owner occupied 8 Commercial real estate non-owner occupied 6 Construction and development < 60 months 3 Construction residential real estate < 60 months 1 Residential real estate first lien 13 Residential real estate all other 7 Farmland 12 Commercial and agricultural non-real estate 3 Consumer non-real estate 4 Oil and gas 2 Other loans 10
Summary of Troubled Debt Restructurings and Other Real Estate Owned and Repossessed Assets	The following is a summary of troubled debt restructurings and other real estate owned and repossessed assets: December 31, 2021 2020 (Dollars in thousands) Troubled debt restructurings $ 3,665 $ 7,784 Other real estate owned and repossessed assets $ 39,553 $ 32,480
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. December 31, 2021 December 31, 2020 (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 2,900 $ 1,404 Commercial real estate non-owner occupied 407 4,719 Construction and development < 60 months 80 95 Construction residential real estate < 60 months — — Residential real estate first lien 2,763 3,615 Residential real estate all other 280 1,362 Farmland 4,224 7,901 Commercial and agricultural non-real estate 7,569 12,782 Consumer non-real estate 148 268 Oil and gas 1,070 — Other loans 1,451 5,399 Total $ 20,892 $ 37,545
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 our loans held for investment: Age Analysis of Past Due Loans 30-59 60-89 90 Days Total Current Total Loans Accruing (Dollars in thousands) December 31, 2021 Real estate: Commercial real estate owner occupied $ 972 $ 223 $ 1,363 $ 2,558 $ 682,181 $ 684,739 $ 18 Commercial real estate non-owner occupied 7,244 — — 7,244 1,088,080 1,095,324 — Construction and development < 60 months 136 — — 136 415,330 415,466 — Construction residential real estate < 60 months 2,264 — — 2,264 252,260 254,524 — Residential real estate first lien 3,351 567 2,817 6,735 930,271 937,006 1,704 Residential real estate all other 293 30 451 774 160,244 161,018 431 Farmland 253 37 2,077 2,367 269,812 272,179 139 Commercial and agricultural non-real estate 1,807 199 4,574 6,580 1,249,907 1,256,487 124 Consumer non-real estate 1,873 321 272 2,466 410,904 413,370 254 Oil and gas — — — — 428,908 428,908 — Other loans 1,773 347 2,646 4,766 245,655 250,421 2,294 Total $ 19,966 $ 1,724 $ 14,200 $ 35,890 $ 6,133,552 $ 6,169,442 $ 4,964 December 31, 2020 Real estate: Commercial real estate owner occupied $ 1,096 $ 108 $ 1,164 $ 2,368 $ 657,394 $ 659,762 $ — Commercial real estate non-owner occupied 323 — 34 357 1,050,382 1,050,739 35 Construction and development < 60 months 511 86 — 597 274,499 275,096 — Construction residential real estate < 60 months 1,106 — 282 1,388 228,805 230,193 282 Residential real estate first lien 5,428 1,463 2,978 9,869 920,707 930,576 945 Residential real estate all other 520 55 1,606 2,181 170,702 172,883 384 Farmland 1,297 344 6,223 7,864 246,466 254,330 135 Commercial and agricultural non-real estate 2,788 1,794 4,345 8,927 1,184,792 1,193,719 465 Consumer non-real estate 2,154 501 534 3,189 373,075 376,264 386 Oil and gas — — — — 428,866 428,866 — Other loans 951 1,223 6,618 8,792 813,286 822,078 2,170 Total $ 16,174 $ 5,574 $ 23,784 $ 45,532 $ 6,348,974 $ 6,394,506 $ 4,802
Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades	The following tables summarize our gross loans held for investment by year of origination and internally assigned credit grades as of the period indicated: Term Loans Amortized Cost Basis by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total (Dollars in thousands) December 31, 2021 Commercial real estate owner occupied Grade 1 $ 136,757 $ 112,106 $ 97,417 $ 49,642 $ 28,208 $ 94,015 $ 17,669 $ 535,814 Grade 2 35,192 33,198 21,570 8,397 7,871 28,395 8,682 143,305 Grade 3 — 275 606 261 465 1,028 62 2,697 Grade 4 337 600 890 445 — 326 325 2,923 Total commercial real estate owner occupied loans 172,286 146,179 120,483 58,745 36,544 123,764 26,738 684,739 Commercial real estate non-owner occupied Grade 1 252,718 204,892 114,429 51,440 37,305 118,264 29,257 808,305 Grade 2 53,548 51,206 50,912 38,850 19,466 36,808 24,335 275,125 Grade 3 7,095 — 3,254 121 234 656 — 11,360 Grade 4 407 — — 35 — 92 — 534 Total commercial real estate non-owner occupied loans 313,768 256,098 168,595 90,446 57,005 155,820 53,592 1,095,324 Construction and development < 60 months Grade 1 173,384 34,351 57,729 9,276 1,953 4,181 32,294 313,168 Grade 2 37,275 7,511 13,161 4,526 803 510 37,153 100,939 Grade 3 1,273 — — 6 — — — 1,279 Grade 4 — — 56 6 18 — — 80 Total construction and development < 60 months 211,932 41,862 70,946 13,814 2,774 4,691 69,447 415,466 Construction residential real estate < 60 months Grade 1 193,311 7,786 41 — 18 29 16,247 217,432 Grade 2 28,170 2,564 — — — 425 5,455 36,614 Grade 3 478 — — — — — — 478 Total construction residential real estate < 60 months 221,959 10,350 41 — 18 454 21,702 254,524 Residential real estate first lien Grade 1 256,834 174,718 99,082 64,949 45,211 128,898 3,928 773,620 Grade 2 44,080 26,073 15,719 12,612 10,926 38,230 — 147,640 Grade 3 1,151 1,266 2,054 1,930 1,155 3,523 — 11,079 Grade 4 64 489 479 1,247 915 1,473 — 4,667 Total residential real estate first lien 302,129 202,546 117,334 80,738 58,207 172,124 3,928 937,006 Residential real estate all other Grade 1 16,376 13,320 8,691 5,609 4,101 12,386 30,840 91,323 Grade 2 2,183 2,941 1,919 1,500 895 2,202 55,000 66,640 Grade 3 250 98 112 232 702 309 538 2,241 Grade 4 156 180 — 38 12 84 344 814 Total residential real estate all other 18,965 16,539 10,722 7,379 5,710 14,981 86,722 161,018 Farmland Grade 1 47,485 39,216 23,627 15,180 12,579 29,457 6,946 174,490 Grade 2 16,063 8,702 23,688 5,488 4,159 10,848 10,455 79,403 Grade 3 3,587 4,021 1,514 74 1,293 1,316 3,386 15,191 Grade 4 1,109 379 — 1,121 109 145 232 3,095 Total farmland 68,244 52,318 48,829 21,863 18,140 41,766 21,019 272,179 Commercial and agricultural non-real estate Grade 1 353,164 102,137 83,615 33,943 27,701 43,750 288,745 933,055 Grade 2 85,920 30,568 25,097 9,607 2,612 10,575 105,682 270,061 Grade 3 2,995 2,185 1,347 11,479 1,291 599 26,642 46,538 Grade 4 870 212 1,222 654 573 1,109 2,193 6,833 Total commercial and agricultural non-real estate 442,949 135,102 111,281 55,683 32,177 56,033 423,262 1,256,487 Consumer non-real estate Grade 1 201,893 80,616 43,793 17,587 5,723 2,048 20,600 372,260 Grade 2 19,349 7,551 6,119 2,167 816 1,342 996 38,340 Grade 3 1,146 307 551 203 86 31 4 2,328 Grade 4 62 90 199 69 14 8 — 442 Total consumer non-real estate 222,450 88,564 50,662 20,026 6,639 3,429 21,600 413,370 Oil and gas Grade 1 188,072 26,090 6,579 1,257 89 73 139,687 361,847 Grade 2 17,150 9,774 13,909 2,657 170 215 13,186 57,061 Grade 3 6,641 10 — — — 255 2,024 8,930 Grade 4 1,000 — — — — — 70 1,070 Total oil and gas 212,863 35,874 20,488 3,914 259 543 154,967 428,908 Other loans Grade 1 109,830 38,379 28,176 20,171 13,908 8,425 26,076 244,965 Grade 2 283 — — 73 2,187 1,041 488 4,072 Grade 3 — — — — — 43 1,073 1,116 Grade 4 — 8 115 — — 44 101 268 Total other loans 110,113 38,387 28,291 20,244 16,095 9,553 27,738 250,421 Total loans held for investment $ 2,297,658 $ 1,023,819 $ 747,672 $ 372,852 $ 233,568 $ 583,158 $ 910,715 $ 6,169,442 Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total (Dollars in thousands) December 31, 2020 Commercial real estate owner occupied Grade 1 $ 136,638 $ 107,664 $ 75,262 $ 46,584 $ 37,857 $ 89,940 $ 18,941 $ 512,886 Grade 2 42,993 31,817 11,060 9,644 14,558 25,494 4,209 139,775 Grade 3 1,010 32 334 704 895 2,671 — 5,646 Grade 4 37 66 742 — 251 52 307 1,455 Total commercial real estate owner occupied loans 180,678 139,579 87,398 56,932 53,561 118,157 23,457 659,762 Commercial real estate non-owner occupied Grade 1 282,985 166,369 88,717 72,117 86,190 81,749 31,747 809,874 Grade 2 62,688 56,026 27,188 20,416 8,755 41,492 5,890 222,455 Grade 3 7,718 3,137 472 1,937 40 148 150 13,602 Grade 4 4,719 89 — — — — — 4,808 Total commercial real estate non-owner occupied loans 358,110 225,621 116,377 94,470 94,985 123,389 37,787 1,050,739 Construction and development < 60 months Grade 1 121,699 62,722 12,821 4,655 2,334 3,824 22,288 230,343 Grade 2 13,433 11,142 3,973 764 157 540 10,798 40,807 Grade 3 3,842 — 9 — — — — 3,851 Grade 4 — 64 9 22 — — — 95 Total construction and development < 60 months 138,974 73,928 16,812 5,441 2,491 4,364 33,086 275,096 Construction residential real estate < 60 months Grade 1 159,432 4,214 69 21 33 23 25,918 189,710 Grade 2 27,400 580 — — — 468 10,030 38,478 Grade 3 1,885 120 — — — — — 2,005 Total construction residential real estate < 60 months 188,717 4,914 69 21 33 491 35,948 230,193 Residential real estate first lien Grade 1 281,908 140,246 87,317 70,541 50,419 138,772 3,362 772,565 Grade 2 35,924 20,492 21,965 13,447 12,254 34,312 — 138,394 Grade 3 2,754 2,029 1,375 2,073 1,213 5,194 — 14,638 Grade 4 731 733 478 210 1,186 1,590 — 4,928 Grade 5 — — — — 51 — — 51 Total residential real estate first lien 321,317 163,500 111,135 86,271 65,123 179,868 3,362 930,576 Residential real estate all other Grade 1 21,492 15,461 11,010 6,717 5,381 11,037 29,851 100,949 Grade 2 3,694 1,675 1,268 1,809 450 2,793 56,295 67,984 Grade 3 384 461 328 116 119 221 494 2,123 Grade 4 204 217 570 65 34 715 22 1,827 Total residential real estate all other 25,774 17,814 13,176 8,707 5,984 14,766 86,662 172,883 Farmland Grade 1 51,284 27,116 18,993 13,821 13,517 27,100 8,185 160,016 Grade 2 15,737 30,684 6,639 6,391 4,763 8,916 7,140 80,270 Grade 3 3,681 290 152 1,055 703 551 1,955 8,387 Grade 4 414 14 4,058 296 340 223 312 5,657 Total farmland 71,116 58,104 29,842 21,563 19,323 36,790 17,592 254,330 Commercial and agricultural non-real estate Grade 1 225,207 146,263 118,571 77,547 46,687 37,767 256,282 908,324 Grade 2 64,187 40,901 29,787 6,590 7,054 22,710 73,134 244,363 Grade 3 18,922 1,400 1,402 723 271 327 12,659 35,704 Grade 4 584 1,607 652 241 1,139 146 959 5,328 Total commercial and agricultural non-real estate 308,900 190,171 150,412 85,101 55,151 60,950 343,034 1,193,719 Consumer non-real estate Grade 1 168,544 94,375 41,715 13,157 6,831 1,768 18,132 344,522 Grade 2 13,444 9,123 4,104 842 507 266 574 28,860 Grade 3 568 840 450 175 75 63 2 2,173 Grade 4 89 287 144 95 47 40 7 709 Total consumer non-real estate 182,645 104,625 46,413 14,269 7,460 2,137 18,715 376,264 Oil and gas Grade 1 151,000 19,288 15,589 464 25 4,777 92,123 283,266 Grade 2 73,882 11,996 6,217 396 169 81 34,210 126,951 Grade 3 9,010 111 64 66 364 — 2,418 12,033 Grade 4 6,600 — — — — 16 — 6,616 Total oil and gas 240,492 31,395 21,870 926 558 4,874 128,751 428,866 Other loans Grade 1 685,426 32,392 25,707 20,638 16,378 10,341 22,976 813,858 Grade 2 — — 17 2,936 1,126 2,179 692 6,950 Grade 3 — — 78 — 53 67 36 234 Grade 4 — — — 124 208 33 671 1,036 Total other loans 685,426 32,392 25,802 23,698 17,765 12,620 24,375 822,078 Total loans held for investment $ 2,702,149 $ 1,042,043 $ 619,306 $ 397,399 $ 322,434 $ 558,406 $ 752,769 $ 6,394,506
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 Impact of CECL adoption Initial allowance on loans purchased with credit deterioration Charge- Recoveries Net Provision Balance at (Dollars in thousands) Year ended December 31, 2021 Real estate: Commercial real estate owner occupied $ 6,911 $ — $ 1,080 $ ( 38 ) $ 74 $ 36 $ ( 1,617 ) $ 6,410 Commercial real estate non-owner occupied 12,318 — 824 ( 803 ) 67 ( 736 ) 4,581 16,987 Construction and development < 60 months 2,723 — 173 — 12 12 582 3,490 Construction residential real estate < 60 months 726 — — — — — 366 1,092 Residential real estate first lien 2,822 — 126 ( 87 ) 55 ( 32 ) 160 3,076 Residential real estate all other 2,236 — — ( 521 ) 52 ( 469 ) 337 2,104 Farmland 3,153 — 395 ( 889 ) 1 ( 888 ) 2,162 4,822 Commercial and agricultural non-real estate 33,020 — 5,663 ( 4,509 ) 218 ( 4,291 ) ( 8,319 ) 26,073 Consumer non-real estate 3,542 — 38 ( 864 ) 326 ( 538 ) 692 3,734 Oil and gas 20,733 — — — — — ( 7,755 ) 12,978 Other loans 3,182 — — ( 134 ) 1 ( 133 ) 121 3,170 Total $ 91,366 $ — $ 8,299 $ ( 7,845 ) $ 806 $ ( 7,039 ) $ ( 8,690 ) $ 83,936 Balance at Impact of CECL adoption Initial allowance on loans purchased with credit deterioration Charge- Recoveries Net Provision Balance at Year ended December 31, 2020 Real estate: Commercial real estate owner occupied $ 5,600 $ ( 2,704 ) $ 432 $ ( 773 ) $ 10 $ ( 763 ) $ 4,346 $ 6,911 Commercial real estate non-owner occupied 8,459 ( 5,265 ) — ( 3,609 ) — ( 3,609 ) 12,733 12,318 Construction and development < 60 months 2,276 ( 916 ) — ( 59 ) 123 64 1,299 2,723 Construction residential real estate < 60 months 1,960 ( 690 ) — ( 29 ) — ( 29 ) ( 515 ) 726 Residential real estate first lien 8,781 ( 3,052 ) 7 ( 465 ) 44 ( 421 ) ( 2,493 ) 2,822 Residential real estate all other 2,763 ( 1,383 ) — ( 126 ) 54 ( 72 ) 928 2,236 Farmland 2,818 ( 1,402 ) 1 ( 2,055 ) — ( 2,055 ) 3,791 3,153 Commercial and agricultural non-real estate 12,310 13,949 62 ( 4,161 ) 540 ( 3,621 ) 10,320 33,020 Consumer non-real estate 3,284 ( 548 ) — ( 1,142 ) 224 ( 918 ) 1,724 3,542 Oil and gas 3,355 ( 1,068 ) — ( 11,245 ) — ( 11,245 ) 29,691 20,733 Other loans 2,632 ( 116 ) — ( 168 ) 10 ( 158 ) 824 3,182 Total $ 54,238 $ ( 3,195 ) $ 502 $ ( 23,832 ) $ 1,005 $ ( 22,827 ) $ 62,648 $ 91,366
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 purchased credit deteriorated loans for the period are as follows: Loans acquired with deteriorated credit quality (Dollars in thousands) For the year ended December 31, 2021 Purchase price of loans at acquisition $ 39,284 Allowance for credit losses at acquisition 8,299 Par value of acquired loans at acquisition $ 47,583 For the year ended December 31, 2020 Purchase price of loans at acquisition $ 1,761 Allowance for credit losses at acquisition 502 Par value of acquired loans at acquisition $ 2,263
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 As of December 31, 2021 (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 1,952 $ — $ — $ — $ 1,952 $ 576 Commercial real estate non-owner occupied 1,404 — — — 1,404 263 Construction and development < 60 months — — — — — — Construction residential real estate < 60 months — — — — — — Residential real estate first lien 871 — — — 871 143 Residential real estate all other 199 — — — 199 178 Farmland 8,703 — — — 8,703 1,805 Commercial and agricultural non-real estate — 6,363 — 5,202 11,565 4,867 Consumer non-real estate — — — 54 54 20 Oil and gas — — — — — — Other loans — 109 — — 109 71 Total collateral-dependent loans held for investment $ 13,129 $ 6,472 $ — $ 5,256 $ 24,857 $ 7,923 Collateral Type Real Estate Business Assets Energy Reserves Other Assets Total Specific Allocation As of December 31, 2020 (Dollars in thousands) Real estate: Commercial real estate owner occupied $ 848 $ — $ — $ — $ 848 $ 226 Commercial real estate non-owner occupied 4,719 — — — 4,719 1,000 Construction and development < 60 months — — — — — — Construction residential real estate < 60 months — — — — — — Residential real estate first lien 2,117 — — — 2,117 373 Residential real estate all other 866 — — — 866 616 Farmland 3,258 — — — 3,258 1,114 Commercial and agricultural non-real estate — 8,460 — 413 8,873 2,813 Consumer non-real estate — — — 109 109 58 Oil and gas — — — — — — Other loans — 13 — — 13 12 Total collateral-dependent loans held for investment $ 11,808 $ 8,473 $ — $ 522 $ 20,803 $ 6,212
Transfers from Loans and Premises and Equipment to Other Real Estate Owned, Repossessed Assets and Other Assets	Transfers from loans and premises and equipment to other real estate owned, repossessed assets, and other assets during the periods presented are summarized as follows: Year ended December 31, 2021 2020 2019 (Dollars in thousands) Other real estate owned $ 12,651 $ 32,093 $ 3,941 Repossessed assets 844 1,418 1,473 Other assets — 11,105 — Total $ 13,495 $ 44,616 $ 5,414
Related Party Loans	A summary of these loans is as follows: Year Ended December 31, Balance Additions Collections/ Terminations Balance (Dollars in thousands) 2021 $ 22,057 $ 31,574 $ ( 25,339 ) $ 28,292 2020 20,281 19,682 ( 17,906 ) 22,057 2019 19,891 12,371 ( 11,981 ) 20,281

Premises and Equipment, Net a_2

Premises and Equipment, Net and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment by Classification	The following is a summary of premises and equipment by classification: December 31, Estimated 2021 2020 (Dollars in thousands) Land $ 44,588 $ 45,792 Buildings 10 to 40 years 256,738 201,606 Furniture, fixtures and equipment 3 to 15 years 89,058 87,001 Construction in progress 12,335 61,300 Accumulated depreciation ( 133,672 ) ( 134,022 ) Premises and equipment, net $ 269,047 $ 261,677

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following is a summary of intangible assets: Gross Accumulated Net (Dollars in thousands) As of December 31, 2021 Core deposit intangibles $ 27,433 $ ( 10,311 ) 17,122 Customer relationship intangibles 3,350 ( 2,906 ) 444 Total $ 30,783 $ ( 13,217 ) $ 17,566 As of December 31, 2020 Core deposit intangibles $ 33,411 $ ( 15,076 ) $ 18,335 Customer relationship intangibles 3,350 ( 2,686 ) 664 Total $ 36,761 $ ( 17,762 ) $ 18,999
Estimated Amortization of Intangible Assets	Estimated amortization of intangible assets for the next five years, as of December 31, 2021, is as follows (dollars in thousands): Estimated Amortization 2022 $ 2,879 2023 2,862 2024 2,862 2025 2,645 2026 2,033
Summary of Goodwill by Business Segment	The following is a summary of goodwill by business segment: Other Executive, Metropolitan Community Pegasus Financial Operations Banks Banks Bank Services & Support Consolidated (Dollars in thousands) Year Ended December 31, 2021 Balance at beginning and end of period $ 13,767 $ 61,212 $ 68,855 $ 5,464 $ 624 $ 149,922 Year Ended December 31, 2020 Balance at beginning of period $ 13,767 $ 59,894 $ 68,855 $ 5,464 $ 624 $ 148,604 Acquisitions — 1,318 — — — 1,318 Balance at end of period $ 13,767 $ 61,212 $ 68,855 $ 5,464 $ 624 $ 149,922

Time Deposits (Tables)

Time Deposits (Tables)	12 Months Ended
	Dec. 31, 2021
Deposits [Abstract]
Schedule of Maturities of Time Deposits	At December 31, 2021, the scheduled maturities of all time deposits are as follows (Dollars in thousands): 2022 $ 465,804 2023 95,294 2024 34,946 2025 19,649 2026 19,273 Total $ 634,966
Summary of time Deposits Meet or Exceed Current Federal Deposit Insurance Corporation Insurance Limit for Periods Presented	The following table is a summary of time deposits that meet or exceed the current Federal Deposit Insurance Corporation ("FDIC") insurance limit for the periods presented: December 31, 2021 2020 (Dollars in thousands) Time deposits of $250,000 or more $ 150,393 $ 154,646

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2021
Short-term Debt [Abstract]
Summary of Short-Term Borrowings	The following is a summary of short-term borrowings: December 31, 2021 2020 (Dollars in thousands) Federal funds purchased $ — $ 1,100 Weighted average interest rate 0.08 % 0.30 % End of period interest rate 0.10 % 0.05 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Components of the Company's Income Tax Expense (Benefit)	The components of the Company’s income tax expense (benefit) are as follows: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Current taxes: Federal $ 28,359 $ 25,974 $ 26,247 State 5,365 7,443 7,288 Deferred taxes 7,044 ( 9,491 ) 1,148 Total income taxes $ 40,768 $ 23,926 $ 34,683
Reconciliation of Tax Expense at the Federal Statutory Tax Rate	A reconciliation of tax expense at the federal statutory tax rate applied to income before taxes is presented in the following table. The federal statutory tax rate was 21 % in 2021, 2020 and 2019: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Tax expense at the federal statutory tax rate $ 43,764 $ 25,937 $ 35,377 Increase (decrease) in tax expense from: Tax-exempt income, net ( 436 ) ( 507 ) ( 581 ) Modified endowment life contracts ( 501 ) ( 508 ) ( 519 ) Share based compensation excess tax benefit ( 1,643 ) ( 412 ) ( 765 ) Tax deductible dividends paid on ESOP ( 490 ) ( 453 ) — State tax expense, net of federal tax benefit 4,779 5,606 5,757 Bargain purchase gain ( 1,007 ) — — Utilization of tax credits: New markets tax credits, net of tax expense ( 3,192 ) ( 3,121 ) ( 3,547 ) Low-income housing tax credits, net of amortization ( 1,533 ) ( 1,273 ) ( 1,266 ) Other tax credits ( 379 ) ( 320 ) — Other, net 1,406 ( 1,023 ) 227 Total tax expense $ 40,768 $ 23,926 $ 34,683
Summary of Net Deferred Tax Asset Reported in Other Assets	The net deferred tax asset consisted of the following and is reported in other assets: December 31, 2021 2020 (Dollars in thousands) Provision for credit losses $ 17,654 $ 22,500 Write-downs of other real estate owned 255 143 Deferred compensation 2,320 2,325 Stock-based compensation 1,575 1,672 Investments in partnership interests 3,840 4,695 Other 901 405 Gross deferred tax assets 26,545 31,740 Unrealized net gains on securities ( 684 ) ( 2,513 ) Premium on securities of banks acquired ( 120 ) ( 144 ) Intangibles ( 5,756 ) ( 6,135 ) Basis difference related to tax credits ( 2,979 ) ( 2,127 ) Depreciation ( 14,545 ) ( 11,529 ) Prepaid expense deducted ( 1,120 ) ( 1,208 ) Other ( 169 ) ( 178 ) Gross deferred tax liabilities ( 25,373 ) ( 23,834 ) Net deferred tax asset $ 1,172 $ 7,906

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Summary of Activity Under Stock Option Plan	he 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) Year Ended December 31, 2021 Outstanding at December 31, 2020 1,343,080 $ 35.28 Options granted 179,500 62.13 Options exercised ( 214,330 ) 23.40 Options canceled, forfeited, or expired ( 5,000 ) 44.23 Outstanding at December 31, 2021 1,303,250 40.90 8.40 Yrs $ 38,656 Exercisable at December 31, 2021 614,875 28.03 7.15 Yrs $ 26,153 Year Ended December 31, 2020 Outstanding at December 31, 2019 1,257,730 $ 32.70 Options granted 171,000 48.89 Options exercised ( 76,650 ) 20.53 Options canceled, forfeited, or expired ( 9,000 ) 58.26 Outstanding at December 31, 2020 1,343,080 35.28 8.61 Yrs $ 31,453 Exercisable at December 31, 2020 710,330 25.06 6.94 Yrs $ 23,894
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: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Total intrinsic value of options exercised $ 9,264 $ 2,315 $ 3,982 Cash received from options exercised 5,015 1,574 2,282 Tax benefit realized from options exercised 2,360 590 1,014
Stock-based Employee Compensation Expense	The following table is a summary of the Company’s recorded stock-based compensation expense: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Stock-based compensation expense $ 2,133 $ 1,516 $ 1,277 Tax benefit 513 386 325 Stock-based compensation expense, net of tax $ 1,620 $ 1,130 $ 952
Unearned Stock-based Compensation Expense	The Company will continue to amortize the unearned stock-based compensation expense over the remaining vesting period of approximately seven years . The following table shows the unearned stock-based compensation expense: December 31, 2021 (Dollars in thousands) Unearned stock-based compensation expense $ 7,109
Assumptions Used for Computing Stock-Based Compensation Expense	he following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented: Year Ended December 31, 2021 2020 2019 Weighted average grant-date fair value per share of options granted $ 21.16 $ 10.85 $ 13.34 Risk-free interest rate 1.30 to 1.74 % 0.64 to 1.13 % 1.55 to 2.76 % Dividend yield 2.00 % 2.00 % 2.00 % Stock price volatility 35.55 to 36.39 % 22.84 to 36.1 % 22.93 to 23.63 % Expected term 10 Yrs 10 Yrs 10 Yrs
Summary of Accumulated Stock Units	A summary of the accumulated stock units is as follows: December 31, 2021 2020 Accumulated stock units 152,754 148,278 Average price $ 30.86 $ 28.57

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Aggregate Amounts of Contributions to the 401(k) and ESOP Plans	The aggregate amounts of contributions by the Company to the 401(k) and ESOP are shown in the following table: December 31, 2021 2020 2019 (Dollars in thousands) 401(k) contributions $ 2,856 $ 2,986 $ 2,526 ESOP contributions 4,317 3,689 4,403 Total contributions $ 7,173 $ 6,675 $ 6,929

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Summary of Authorized Outstanding Preferred and Common Stock	As of December 31, 2021, 2020 and 2019 the Company’s authorized and outstanding preferred and common stock was as follows: No. of Shares No. of Shares Outstanding at December 31, Class of Stock December 31, 2021 2021 2020 2019 Par Value Dividends Voting Rights Senior Preferred 10,000,000 — — — $ 1.00 As declared Voting 10% Cumulative 900,000 — — — 5.00 As declared Non-voting Common 40,000,000 32,603,118 32,719,852 32,694,268 1.00 As declared Voting
Summary of Shares Repurchased Under Stock Purchase Program	The following table is a summary of the shares under the program: Year Ended December 31, 2021 2020 2019 Number of shares repurchased 212,296 59,284 26,670 Average price of shares repurchased $ 54.94 $ 52.26 $ 60.04 Shares remaining to be repurchased 500,486 62,782 122,066
Required Capital Amounts and Company's Respective Ratios	The actual and required capital amounts and ratios are shown in the following table: Actual Required For Capital Adequacy Purposes With Capital Consevation Buffer To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) As of December 31, 2021: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,171,215 17.30 % $ 541,493 8.00 % $ 710,709 10.50 % N/A N/A BancFirst 1,004,835 16.75 % 479,883 8.00 % 629,847 10.50 % $ 599,854 10.00 % Pegasus Bank 88,224 11.62 % 60,765 8.00 % 79,754 10.50 % 75,956 10.00 % Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,002,096 14.80 % $ 304,590 4.50 % $ 473,806 7.00 % N/A N/A BancFirst 909,817 15.17 % 269,934 4.50 % 419,898 7.00 % $ 389,905 6.50 % Pegasus Bank 82,056 10.80 % 34,180 4.50 % 53,170 7.00 % 49,372 6.50 % Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 1,028,096 15.19 % $ 406,120 6.00 % $ 575,336 8.50 % N/A N/A BancFirst 929,817 15.50 % 359,913 6.00 % 509,876 8.50 % $ 479,883 8.00 % Pegasus Bank 82,056 10.80 % 45,574 6.00 % 64,563 8.50 % 60,765 8.00 % Tier 1 Capital (to Total Assets)- BancFirst Corporation $ 1,028,096 9.14 % $ 449,847 4.00 % N/A N/A N/A N/A BancFirst 929,817 9.22 % 403,460 4.00 % N/A N/A $ 504,325 5.00 % Pegasus Bank 82,056 6.98 % 47,054 4.00 % N/A N/A 58,817 5.00 % As of December 31, 2020: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 997,383 15.64 % $ 510,110 8.00 % $ 669,519 10.50 % N/A N/A BancFirst 898,714 15.59 % 461,142 8.00 % 605,248 10.50 % $ 576,427 10.00 % Pegasus Bank 70,922 11.85 % 47,893 8.00 % 62,860 10.50 % 59,866 10.00 % Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 891,534 13.98 % $ 286,937 4.50 % $ 446,346 7.00 % N/A N/A BancFirst 806,478 13.99 % 259,392 4.50 % 403,499 7.00 % $ 374,678 6.50 % Pegasus Bank 66,150 11.05 % 26,940 4.50 % 41,906 7.00 % 38,913 6.50 % Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 917,534 14.39 % $ 382,583 6.00 % $ 541,992 8.50 % N/A N/A BancFirst 826,478 14.34 % 345,856 6.00 % 489,963 8.50 % $ 461,142 8.00 % Pegasus Bank 66,150 11.05 % 35,920 6.00 % 50,886 8.50 % 47,893 8.00 % Tier 1 Capital (to Total Assets)- BancFirst Corporation $ 917,534 9.63 % $ 380,952 4.00 % N/A N/A N/A N/A BancFirst 826,478 9.48 % 348,666 4.00 % N/A N/A $ 435,833 5.00 % Pegasus Bank 66,150 8.10 % 32,682 4.00 % N/A N/A 40,852 5.00 %

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Basic and Diluted Net Income Per Common Share	Basic and diluted net income per common share are calculated as follows: Income Shares Per Share (Dollars in thousands, except per share data) Year Ended December 31, 2021 Basic Income available to common stockholders $ 167,630 32,716,099 $ 5.12 Dilutive effect of stock options — 598,047 Diluted Income available to common stockholders plus assumed $ 167,630 33,314,146 $ 5.03 Year Ended December 31, 2020 Basic Income available to common stockholders $ 99,586 32,672,522 $ 3.05 Dilutive effect of stock options — 538,430 Diluted Income available to common stockholders plus assumed $ 99,586 33,210,952 $ 3.00 Year Ended December 31, 2019 Basic Income available to common stockholders $ 134,879 32,639,396 $ 4.13 Dilutive effect of stock options — 690,448 Diluted Income available to common stockholders plus assumed $ 134,879 33,329,844 $ 4.05
Average Exercise Price of Options Excluded from Computation of Diluted Net Income Per Common Share	The following table shows the number and average exercise price of options that were excluded from the computation of diluted net income per common share for each year because the options were anti-dilutive for the period. Shares Average Price December 31, 2021 189,780 $ 60.33 December 31, 2020 402,575 52.72 December 31, 2019 180,989 54.73

Condensed Parent Company Fina_2

Condensed Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2021
Condensed Financial Information Disclosure [Abstract]
Summary of Balance Sheet of Parent Company	BALANCE SHEETS December 31, 2021 2020 (Dollars in thousands) ASSETS Cash $ 62,007 $ 9,081 Investments in subsidiaries 1,117,622 1,003,017 Goodwill 69,478 69,478 Core deposit premium 7,627 8,622 Dividends receivable 13,426 12,750 Other assets 1,515 5,331 Total assets $ 1,271,675 $ 1,108,279 LIABILITIES AND STOCKHOLDERS’ EQUITY Other liabilities $ 13,954 $ 13,590 Subordinated debt 85,987 26,804 Stockholders’ equity 1,171,734 1,067,885 Total liabilities and stockholders’ equity $ 1,271,675 $ 1,108,279
Summary of Income Statement of Parent Company	STATEMENTS OF INCOME Year Ended December 31, 2021 2020 2019 (Dollars in thousands) OPERATING INCOME Dividends from subsidiaries $ 54,480 $ 50,872 $ 77,559 Interest on interest-bearing deposits 41 1 1,150 Other 1,071 886 451 Total operating income 55,592 51,759 79,160 OPERATING EXPENSE Interest 3,130 1,965 1,965 Other 3,340 3,317 5,017 Total operating expense 6,470 5,282 6,982 Income before taxes and equity in undistributed earnings of subsidiaries 49,122 46,477 72,178 Allocated income tax benefit 4,191 2,610 2,731 Income before equity in undistributed earnings of subsidiaries 53,313 49,087 74,909 Equity in undistributed earnings of subsidiaries 116,365 51,955 61,194 Amortization of stock-based compensation arrangements of subsidiaries ( 2,048 ) ( 1,456 ) ( 1,224 ) Net income $ 167,630 $ 99,586 $ 134,879
Summary of Cash Flow of Parent Company	STATEMENTS OF CASH FLOW Year Ended December 31, 2021 2020 2019 (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 167,630 $ 99,586 $ 134,879 Adjustments to reconcile to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries ( 116,365 ) ( 51,955 ) ( 61,194 ) Amortization of stock-based compensation arrangements of subsidiaries 2,048 1,456 1,224 Other, net 5,056 188 ( 440 ) Net cash provided by operating activities 58,369 49,275 74,469 INVESTING ACTIVITIES Payments for investments in subsidiaries ( 9,000 ) ( 1,000 ) ( 134,457 ) Other, net 4,429 ( 1,175 ) ( 418 ) Net cash used in investing activities ( 4,571 ) ( 2,175 ) ( 134,875 ) FINANCING ACTIVITIES Issuance of common stock 2,260 1,790 2,484 Common stock acquired ( 11,663 ) ( 3,098 ) ( 1,601 ) Net cash settlement of options ( 5,479 ) — — Cash dividends paid ( 45,140 ) ( 42,472 ) ( 39,805 ) Proceeds from the issuance of subordinated notes, net of debt issuance costs 59,150 — — Net cash used in financing activities ( 872 ) ( 43,780 ) ( 38,922 ) Net increase (decrease) in cash and due from banks 52,926 3,320 ( 99,328 ) Cash and due from banks at the beginning of the period 9,081 5,761 105,089 Cash and due from banks at the end of the period $ 62,007 $ 9,081 $ 5,761 SUPPLEMENTAL DISCLOSURE Cash paid during the period for interest $ 3,130 $ 1,966 $ 5,131 Cash received during the period for income taxes, net $ 4,411 $ 2,812 $ 4,518

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Summary of Financial Instruments with Off-Balance-Sheet Risks	The amounts of financial instruments with off-balance-sheet risk are as follows: December 31, 2021 2020 (Dollars in thousands) Loan commitments $ 2,084,706 $ 1,779,857 Stand-by letters of credit 82,841 96,311

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Schedule of Rent Expense of Operating Leases	Rental expense on all operating leases, including those rented on a monthly or temporary basis were as follows (Dollars in thousands): Year Ending December 31: 2021 $ 1,560 2020 1,894 2019 1,633
Schedule of Minimum Future Commitments of Operating Leases	The following table presents minimum future commitments by year for the Company’s operating leases. Such commitments are reflected as undiscounted values and are reconciled to the discounted present value recognized on the balance sheet. December 31, 2021 (Dollars in thousands) 2022 $ 1,405 2023 1,027 2024 664 2025 608 2026 508 Thereafter 1,396 Total lease payments 5,608 Less imputed interest ( 732 ) Operating lease liability $ 4,876
Scheduled of Minimum Future Contractual Rent To be Received Under The Remaining Non-Cancelable Term of Operating Leases	The following table presents the scheduled minimum future contractual rent to be received under the remaining non-cancelable term of the operating leases: December 31, 2021 (Dollars in thousands) 2022 $ 3,375 2023 2,636 2024 2,574 2025 1,946 2026 1,547 2027-2030 2,921 Total future minimum lease payments $ 14,999

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2021
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) December 31, 2021 Debt securities available for sale: U.S. Treasury $ 457,628 $ — $ — $ 457,628 U.S. federal agencies — 21,942 — 21,942 Mortgage-backed securities — 29,283 — 29,283 States and political subdivisions — 5,999 320 6,319 Asset backed securities — 13,357 — 13,357 Other debt securities — 2,994 — 2,994 Derivative assets — 8,946 — 8,946 Derivative liabilities — 8,237 — 8,237 December 31, 2020 Debt securities available for sale: U.S. Treasury $ 475,236 $ — $ — $ 475,236 U.S. federal agencies — 19,638 — 19,638 Mortgage-backed securities — 15,696 — 15,696 States and political subdivisions — 28,793 155 28,948 Asset backed securities — — 12,714 12,714 Derivative assets — 991 — 991 Derivative liabilities — 872 — 872
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: Twelve Months Ended 2021 2020 (Dollars in thousands) Balance at the beginning of the year $ 12,869 $ 12,714 Transfers (to)/from level 2 ( 12,714 ) 1,643 Purchases 240 — Settlements ( 75 ) ( 1,473 ) Total unrealized losses — ( 15 ) Balance at the end of the period $ 320 $ 12,869
Assets Measured at Fair Value on Nonrecurring Basis	The following table summarizes assets measured at fair value on a nonrecurring basis. The fair value represents end of period values, which approximate fair value measurements that occurred on various measurement dates throughout the period: Total Fair Value (Dollars in thousands) As of and for the Year-to-date Period Ended December 31, 2021 Equity securities $ 10,590 Collateral dependent loans 13,195 Repossessed assets 78 Other real estate owned 7,496 As of and for the Year-to-date Period Ended December 31, 2020 Equity securities $ 10,098 Collateral dependent loans 11,347 Repossessed assets 291 Other real estate owned 32,066
Estimated Fair Values of Financial Instruments	he 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: December 31, 2021 2020 Carrying Fair Value Carrying Fair Value (Dollars in thousands) FINANCIAL ASSETS Level 2 inputs: Cash and cash equivalents $ 2,050,022 $ 2,050,022 $ 1,616,912 $ 1,616,912 Federal funds sold 800 800 — — Debt securities held for investment 32 33 59 62 Loans held for sale 24,776 24,776 53,719 53,719 Level 3 inputs: Debt securities held for investment 2,945 2,945 2,905 2,922 Loans, net of allowance for credit losses 6,085,506 6,059,716 6,303,140 6,347,803 FINANCIAL LIABILITIES Level 2 inputs: Deposits 8,091,914 8,161,553 8,064,704 8,084,695 Short-term borrowings — — 1,100 1,100 Subordinated debt 85,987 90,391 26,804 30,535 OFF-BALANCE SHEET FINANCIAL INSTRUMENTS Loan commitments 3,648 3,115 Letters of credit 621 722

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2021
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: December 31, 2021 2020 Oil and Natural Gas Swaps and Options Notional Units Notional Estimated Notional Estimated (Notional amounts and dollars in thousands) Oil Derivative assets Barrels 2,585 $ 6,563 50 $ 53 Derivative liabilities Barrels ( 2,585 ) ( 6,129 ) ( 50 ) ( 43 ) Natural Gas Derivative assets MMBTUs 19,752 2,383 4,663 938 Derivative liabilities MMBTUs ( 19,752 ) ( 2,108 ) ( 4,663 ) ( 829 ) Total Fair Value Included in Derivative assets Other assets 8,946 991 Derivative liabilities Other liabilities ( 8,237 ) ( 872 )
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: Year Ended December 31, 2021 2020 2019 (Dollars in thousands) Derivative income $ 266 $ 50 $ 3
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: December 31, 2021 2020 (Dollars in thousands) Credit exposure $ — $ 965

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Results of Operations and Selected Financial Information	The results of operations and selected financial information for the five business units are as follows: Metropolitan Community Pegasus Other Executive, Eliminations Consolidated (Dollars in thousands) December 31, 2021 Net interest income $ 77,840 $ 180,925 $ 24,222 $ 35,244 $ ( 3,295 ) $ 721 $ 315,657 Provision for/(benefit from) credit losses ( 5,474 ) ( 4,694 ) 1,395 109 ( 26 ) — ( 8,690 ) Noninterest income 23,257 65,600 1,448 47,124 203,005 ( 170,402 ) 170,032 Depreciation and amortization 2,593 10,483 782 557 5,626 — 20,041 Other expenses 39,356 110,574 15,317 60,435 41,199 ( 941 ) 265,940 Income before taxes $ 64,622 $ 130,162 $ 8,176 $ 21,267 $ 152,911 $ ( 168,740 ) $ 208,398 Total assets $ 2,627,874 $ 5,821,220 $ 1,045,699 $ 71,694 $ 1,201,974 $ ( 1,362,849 ) $ 9,405,612 Capital expenditures $ 1,612 $ 7,390 $ 363 $ 400 $ 17,486 $ — $ 27,251 December 31, 2020 Net interest income $ 85,464 $ 175,757 $ 21,360 $ 23,500 $ 79 $ 508 $ 306,668 Provision for credit losses 30,202 29,827 1,916 562 141 — 62,648 Noninterest income 18,664 60,386 1,071 41,549 118,491 ( 102,939 ) 137,222 Depreciation and amortization 2,639 10,603 760 500 3,922 — 18,424 Other expenses 36,746 111,341 13,831 44,918 33,588 ( 1,118 ) 239,306 Income before taxes $ 34,541 $ 84,372 $ 5,924 $ 19,069 $ 80,919 $ ( 101,313 ) $ 123,512 Total assets $ 2,729,886 $ 5,527,611 $ 919,572 $ 137,122 $ 1,073,507 $ ( 1,175,341 ) $ 9,212,357 Capital expenditures $ 1,087 $ 9,946 $ 1,775 $ 450 $ 53,188 $ — $ 66,446 December 31, 2019 Net interest income $ 86,511 $ 177,330 $ 8,657 $ 5,763 $ 3,660 $ — $ 281,921 Provision for credit losses 2,143 5,606 140 ( 69 ) 467 — 8,287 Noninterest income 18,608 64,485 483 40,270 152,320 ( 138,937 ) 137,229 Depreciation and amortization 2,463 10,218 274 603 2,431 — 15,989 Other expenses 37,549 109,044 4,939 25,408 50,941 ( 2,569 ) 225,312 Income before taxes $ 62,964 $ 116,947 $ 3,787 $ 20,091 $ 102,141 $ ( 136,368 ) $ 169,562 Total assets $ 2,806,021 $ 4,998,247 $ 738,351 $ 102,442 $ 950,920 $ ( 1,030,223 ) $ 8,565,758 Capital expenditures $ 4,349 $ 11,219 $ 83 $ 1,220 $ 10,183 $ — $ 27,054

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Days from origination after which mortgage loans are sold	30 days
Loan upon which a default of principal or interest has existed for a period	90 days
Intangible assets, Estimated useful lives	6 years 7 months 6 days
Advertising costs	$ 3	$ 3.3	$ 3.8
Revenue recognition, description of performance obligation	the Company offers various services to customers that generate revenue. Contract performance typically occurs in one year or less.
Incremental cost of obtaining contract	true
Revenue recognition, description of payment terms	Revenue is recognized when the transactions occur or as services are performed over primarily monthly or quarterly periods. Payment is typically received in the period the transactions occur, or in some cases, within 90 days of the service period.
Delinquency period placed on nonaccrual status loan	90 days
Commercial loans are charged off deemed uncollectible period	180 days
Oklahoma [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Commercial loans past due period	90 days
Paycheck Protection Program, CARES Act [Member] | Small Business Administration (SBA) [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of processing fees	5.00%
Unamortized balances of fees	$ 2	14.5
Processing fees received from the SBA	$ 23.8	$ 30.2
U.S. Treasury or U.S. Government-sponsored Entities and Agencies [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of available for sale securities held	95.00%	95.00%
Core Deposit Intangibles [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Estimated useful lives	6 years 8 months 12 days
Core Deposit Intangibles [Member] | Minimum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Estimated useful lives	7 years
Core Deposit Intangibles [Member] | Maximum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Estimated useful lives	10 years
Customer Relationship Intangibles [Member] | Minimum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Estimated useful lives	3 years
Customer Relationship Intangibles [Member] | Maximum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Estimated useful lives	18 years

Recent Developments Including M

Recent Developments Including Mergers and Acquisitions - Additional Information (Detail)	Jun. 17, 2021USD ($)	May 20, 2021USD ($)Location	Jan. 22, 2021USD ($)	Mar. 05, 2020USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Business Combination Separately Recognized Transactions [Line Items]
Total assets					$ 9,405,612,000	$ 9,212,357,000	$ 8,565,758,000
Loans held for investment (net of unearned interest)					6,169,442,000	6,394,506,000
Deposits					8,091,914,000	8,064,704,000
Goodwill					$ 149,922,000	$ 149,922,000	$ 148,604,000
Oklahoma [Member]
Business Combination Separately Recognized Transactions [Line Items]
Sale of Loans			$ 21,000,000
Deposits sold			38,000,000
Oklahoma [Member] | Noninterest Income [Member]
Business Combination Separately Recognized Transactions [Line Items]
Gain on transaction			$ 2,500,000
First National Bank and Trust [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total assets		$ 284,000,000
Loans held for investment (net of unearned interest)		195,000,000
Deposits		256,000,000
Purchase price		21,000,000
Bargain purchase gain		4,800,000
Purchase expenses		4,800,000
Intangibles assets, net		$ 1,700,000
First National Bank and Trust [Member] | Oklahoma [Member]
Business Combination Separately Recognized Transactions [Line Items]
Number of banking locations | Location		2
Subordinated Notes due 2036 [Member] | Private Placement [Member]
Business Combination Separately Recognized Transactions [Line Items]
Aggregate principal amount	$ 60,000,000
Fixed-to-floating rate	3.50%
Debt instrument maturity year	2036
Citizens Bankshares, Inc [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total assets				$ 47,800,000
Loans held for investment (net of unearned interest)				22,900,000
Deposits				45,000,000
Purchase price				$ 2,900,000
Date of acquisition				Mar. 5, 2020
Intangibles assets, net				$ 206,000
Goodwill				$ 1,300,000

Cash Due from Banks, Interest-B

Cash Due from Banks, Interest-Bearing Deposits and Federal Funds Sold - Summary of Vault Cash and Funds on Deposit with Federal Reserve Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Average Amount Of Required Reserves [Abstract]
Vault cash and funds on deposit with the Federal Reserve Bank	$ 1,907,482	$ 1,429,410

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,977	$ 2,964
Gross Unrealized Gains	1	21
Gross Unrealized Losses		(1)
Estimated Fair Value	2,978	2,984
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	32	59
Gross Unrealized Gains	1	3
Estimated Fair Value	33	62
States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,445	2,405
Gross Unrealized Gains		18
Gross Unrealized Losses		(1)
Estimated Fair Value	2,445	2,422
Other Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	500	500
Estimated Fair Value	$ 500	$ 500

Securities - Summary of Amort_2

Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 528,689	$ 542,289
Gross Unrealized Gains	4,625	10,626
Gross Unrealized Losses	(1,791)	(683)
Estimated Fair Value	531,523	552,232
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	455,701	465,416
Gross Unrealized Gains	3,693	9,820
Gross Unrealized Losses	(1,766)
Estimated Fair Value	457,628	475,236
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,609	19,697
Gross Unrealized Gains	335	1
Gross Unrealized Losses	(2)	(60)
Estimated Fair Value	21,942	19,638
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	28,897	15,268
Gross Unrealized Gains	400	428
Gross Unrealized Losses	(14)
Estimated Fair Value	29,283	15,696
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,128	28,571
Gross Unrealized Gains	194	377
Gross Unrealized Losses	(3)
Estimated Fair Value	6,319	28,948
Asset backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,354	13,337
Gross Unrealized Gains	3
Gross Unrealized Losses		(623)
Estimated Fair Value	13,357	$ 12,714
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,000
Gross Unrealized Losses	(6)
Estimated Fair Value	$ 2,994

Securities - Maturity of Debt S

Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 577	$ 807
Amortized cost, After one year but within five years	2,396	2,091
Amortized cost, After five years but within ten years	4	65
Amortized cost, After ten years		1
Amortized Cost	2,977	2,964
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	58,478	339,752
Amortized Cost, After one year but within five years	408,253	162,401
Amortized Cost, After five years but within ten years	10,851	3,753
Amortized Cost, After ten years	51,107	36,383
Amortized Cost	528,689	542,289
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	577	809
Estimated Fair Value, After one year but within five years	2,397	2,110
Estimated Fair Value, After five years but within ten years	4	64
Estimated Fair Value, After ten years		1
Estimated Fair Value	2,978	2,984
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	58,688	341,102
Estimated Fair Value, After one year but within five years	410,049	171,135
Estimated Fair Value, After five years but within ten years	11,011	3,910
Estimated Fair Value, After ten years	51,775	36,085
Total debt securities	$ 531,523	$ 552,232

Securities - Additional Informa

Securities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Proceeds from sales of available for sale debt securities	$ 0	$ 0	$ 0
Gross losses realized	$ 0	$ 0	$ 0

Securities - Company's Book Val

Securities - Company's Book Value of Pledged Debt Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Pledged Financial Instruments, Not Separately Reported, Securities, by Type of Security [Abstract]
Book value of pledged securities	$ 473,026	$ 490,833

Securities - Summary of Debt Se

Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available for Sale
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 304,779	$ 12,236
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	1,791	41
Available-for-sale Securities, 12 Months or Longer, Fair Value		14,898
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses		642
Available-for-sale Securities, Fair Value, Total	304,779	27,134
Available-for-sale Securities, Unrealized Losses, Total	1,791	683
Held for Investment
Held-to-maturity Securities, Less than 12 Months, Fair Value		119
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses		1
Held-to-maturity Securities, Fair Value, Total		119
Held-to-maturity Securities, Unrealized Losses, Total		1
U.S. Treasuries [Member]
Available for Sale
Available-for-sale Securities, Less than 12 Months, Fair Value	298,080
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	1,766
Available-for-sale Securities, Fair Value, Total	298,080
Available-for-sale Securities, Unrealized Losses, Total	1,766
U.S. Federal Agencies [Member]
Available for Sale
Available-for-sale Securities, Less than 12 Months, Fair Value	376	12,236
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	2	41
Available-for-sale Securities, 12 Months or Longer, Fair Value		2,184
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses		19
Available-for-sale Securities, Fair Value, Total	376	14,420
Available-for-sale Securities, Unrealized Losses, Total	2	60
Asset backed Securities [Member]
Available for Sale
Available-for-sale Securities, 12 Months or Longer, Fair Value		12,714
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses		623
Available-for-sale Securities, Fair Value, Total		12,714
Available-for-sale Securities, Unrealized Losses, Total		623
Mortgage Backed Securities [Member]
Available for Sale
Available-for-sale Securities, Less than 12 Months, Fair Value	2,824
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	14
Available-for-sale Securities, Fair Value, Total	2,824
Available-for-sale Securities, Unrealized Losses, Total	14
States and Political Subdivisions [Member]
Available for Sale
Available-for-sale Securities, Less than 12 Months, Fair Value	505
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	3
Available-for-sale Securities, Fair Value, Total	505
Available-for-sale Securities, Unrealized Losses, Total	3
Held for Investment
Held-to-maturity Securities, Less than 12 Months, Fair Value		119
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses		1
Held-to-maturity Securities, Fair Value, Total		119
Held-to-maturity Securities, Unrealized Losses, Total		$ 1
Other Securities [Member]
Available for Sale
Available-for-sale Securities, Less than 12 Months, Fair Value	2,994
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	6
Available-for-sale Securities, Fair Value, Total	2,994
Available-for-sale Securities, Unrealized Losses, Total	$ 6

Loans Held for Investment and_3

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	$ 6,169,442	$ 6,394,506
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)	684,739	659,762
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)	1,095,324	1,050,739
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)	415,466	275,096
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)	254,524	230,193
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)	937,006	930,576
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)	161,018	172,883
Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	272,179	254,330
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	1,256,487	1,193,719
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	413,370	376,264
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	428,908	428,866
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment (net of unearned interest)	$ 250,421	$ 822,078

Loans Held for Investment and_4

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Accrued interest receivable	$ 21	$ 26
Pay check protection program loan held for investment	80.4	652.7
Paycheck protection program unamortized processing fees	$ 2	$ 14.5

Loans Held for Investment and_5

Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable Recorded Investment [Line Items]
Total loans		$ 6,169,442,000	$ 6,394,506,000
Paycheck protection program amortized processing fees recognized as interest income		36,400,000	15,500,000
Gains on sale of property held in other real estate owned		618,000,000	2,400,000	$ 1,400,000
Interest income that would have been recognized		2,200,000	2,800,000	1,700,000
Decrease in allowance for credit losses upon adoption of ASC 326	$ 3,200,000		3,195,000
Provision for credit losses on loans		(8,690,000)	62,648,000	$ 8,287,000
Interest income recognized on collateral-dependent loans		0	0
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Loans modification		53,900,000	81,700,000
U.S. Federal Agencies [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans guaranteed by government agencies		3,300,000
Previous Corporate Headquarters [Member] | Other Real Estate Owned [Member]
Financing Receivable Recorded Investment [Line Items]
Transferred premises and equipment to other real estate		$ 2,400,000
BancFirst [Member]
Financing Receivable Recorded Investment [Line Items]
Loans held for sale			21,600,000
Amount transferred from loans held for investment (net of unearned interest) to loans held for sale			$ 21,600,000
Parent Company [Member]
Financing Receivable Recorded Investment [Line Items]
Percentage of loans secured by real estate		62.00%

Loans Held for Investment and_6

Loans Held for Investment and Allowance for Credit Losses on Loans - Schedule of Portfolio Segments Weighted Average Life, and Measures the Allowance for Credit Losses (Detail) - ASC 326 [Member]	12 Months Ended
	Dec. 31, 2021
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	8 years
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	6 years
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	3 years
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	1 year
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	13 years
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	7 years
Real Estate [Member] | Farmland [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	12 years
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	3 years
Consumer Non-real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	4 years
Oil and Gas [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	2 years
Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan Segment, Life (in years)	10 years

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Troubled Debt Restructurings and Other Real Estate Owned and Repossessed Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Summary Of Nonperforming And Restructured Assets [Abstract]
Troubled debt restructurings	$ 3,665	$ 7,784
Other real estate owned and repossessed assets	$ 39,553	$ 32,480

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Amounts Included in Nonaccrual Loans Segregated by Portfolio Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 20,892	$ 37,545
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	2,900	1,404
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	407	4,719
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	80	95
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	2,763	3,615
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	280	1,362
Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	4,224	7,901
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	7,569	12,782
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	148	268
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	1,070
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 1,451	$ 5,399

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Credit Losses on Loans - Age Analysis of Loans Held for Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 6,169,442	$ 6,394,506
Accruing Loans 90 Days or More Past Due	4,964	4,802
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	684,739	659,762
Accruing Loans 90 Days or More Past Due	18
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,095,324	1,050,739
Accruing Loans 90 Days or More Past Due		35
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	415,466	275,096
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	254,524	230,193
Accruing Loans 90 Days or More Past Due		282
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	937,006	930,576
Accruing Loans 90 Days or More Past Due	1,704	945
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	161,018	172,883
Accruing Loans 90 Days or More Past Due	431	384
Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	272,179	254,330
Accruing Loans 90 Days or More Past Due	139	135
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,256,487	1,193,719
Accruing Loans 90 Days or More Past Due	124	465
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	413,370	376,264
Accruing Loans 90 Days or More Past Due	254	386
Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	428,908	428,866
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	250,421	822,078
Accruing Loans 90 Days or More Past Due	2,294	2,170
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	19,966	16,174
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	972	1,096
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	7,244	323
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	136	511
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	2,264	1,106
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	3,351	5,428
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	293	520
30 to 59 Days Past Due [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	253	1,297
30 to 59 Days Past Due [Member] | Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,807	2,788
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,873	2,154
30 to 59 Days Past Due [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,773	951
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,724	5,574
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	223	108
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		86
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	567	1,463
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	30	55
60 to 89 Days Past Due [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	37	344
60 to 89 Days Past Due [Member] | Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	199	1,794
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	321	501
60 to 89 Days Past Due [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	347	1,223
90 Days and Greater [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	14,200	23,784
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	1,363	1,164
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		34
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		282
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	2,817	2,978
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	451	1,606
90 Days and Greater [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,077	6,223
90 Days and Greater [Member] | Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,574	4,345
90 Days and Greater [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	272	534
90 Days and Greater [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,646	6,618
Past Due Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	35,890	45,532
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	2,558	2,368
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	7,244	357
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	136	597
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	2,264	1,388
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	6,735	9,869
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	774	2,181
Past Due Loans [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,367	7,864
Past Due Loans [Member] | Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	6,580	8,927
Past Due Loans [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,466	3,189
Past Due Loans [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,766	8,792
Current Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	6,133,552	6,348,974
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	682,181	657,394
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	1,088,080	1,050,382
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	415,330	274,499
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	252,260	228,805
Current Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	930,271	920,707
Current Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	160,244	170,702
Current Loans [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	269,812	246,466
Current Loans [Member] | Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,249,907	1,184,792
Current Loans [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	410,904	373,075
Current Loans [Member] | Oil and Gas [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	428,908	428,866
Current Loans [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 245,655	$ 813,286

Loans Held for Investment an_10

Loans Held for Investment and Allowance for Credit Losses on Loans - Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	$ 2,297,658	$ 2,702,149
Fiscal year before current fiscal year	1,023,819	1,042,043
Two years before current fiscal year	747,672	619,306
Three years before current fiscal year	372,852	397,399
Four years before current fiscal year	233,568	322,434
Prior	583,158	558,406
Revolving Loans Amortized Cost Basis	910,715	752,769
Total Loans	6,169,442	6,394,506
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	172,286	180,678
Fiscal year before current fiscal year	146,179	139,579
Two years before current fiscal year	120,483	87,398
Three years before current fiscal year	58,745	56,932
Four years before current fiscal year	36,544	53,561
Prior	123,764	118,157
Revolving Loans Amortized Cost Basis	26,738	23,457
Total Loans	684,739	659,762
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	136,757	136,638
Fiscal year before current fiscal year	112,106	107,664
Two years before current fiscal year	97,417	75,262
Three years before current fiscal year	49,642	46,584
Four years before current fiscal year	28,208	37,857
Prior	94,015	89,940
Revolving Loans Amortized Cost Basis	17,669	18,941
Total Loans	535,814	512,886
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	35,192	42,993
Fiscal year before current fiscal year	33,198	31,817
Two years before current fiscal year	21,570	11,060
Three years before current fiscal year	8,397	9,644
Four years before current fiscal year	7,871	14,558
Prior	28,395	25,494
Revolving Loans Amortized Cost Basis	8,682	4,209
Total Loans	143,305	139,775
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year		1,010
Fiscal year before current fiscal year	275	32
Two years before current fiscal year	606	334
Three years before current fiscal year	261	704
Four years before current fiscal year	465	895
Prior	1,028	2,671
Revolving Loans Amortized Cost Basis	62
Total Loans	2,697	5,646
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	337	37
Fiscal year before current fiscal year	600	66
Two years before current fiscal year	890	742
Three years before current fiscal year	445
Four years before current fiscal year		251
Prior	326	52
Revolving Loans Amortized Cost Basis	325	307
Total Loans	2,923	1,455
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	313,768	358,110
Fiscal year before current fiscal year	256,098	225,621
Two years before current fiscal year	168,595	116,377
Three years before current fiscal year	90,446	94,470
Four years before current fiscal year	57,005	94,985
Prior	155,820	123,389
Revolving Loans Amortized Cost Basis	53,592	37,787
Total Loans	1,095,324	1,050,739
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	252,718	282,985
Fiscal year before current fiscal year	204,892	166,369
Two years before current fiscal year	114,429	88,717
Three years before current fiscal year	51,440	72,117
Four years before current fiscal year	37,305	86,190
Prior	118,264	81,749
Revolving Loans Amortized Cost Basis	29,257	31,747
Total Loans	808,305	809,874
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	53,548	62,688
Fiscal year before current fiscal year	51,206	56,026
Two years before current fiscal year	50,912	27,188
Three years before current fiscal year	38,850	20,416
Four years before current fiscal year	19,466	8,755
Prior	36,808	41,492
Revolving Loans Amortized Cost Basis	24,335	5,890
Total Loans	275,125	222,455
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	7,095	7,718
Fiscal year before current fiscal year		3,137
Two years before current fiscal year	3,254	472
Three years before current fiscal year	121	1,937
Four years before current fiscal year	234	40
Prior	656	148
Revolving Loans Amortized Cost Basis		150
Total Loans	11,360	13,602
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	407	4,719
Fiscal year before current fiscal year		89
Three years before current fiscal year	35
Prior	92
Total Loans	534	4,808
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	211,932	138,974
Fiscal year before current fiscal year	41,862	73,928
Two years before current fiscal year	70,946	16,812
Three years before current fiscal year	13,814	5,441
Four years before current fiscal year	2,774	2,491
Prior	4,691	4,364
Revolving Loans Amortized Cost Basis	69,447	33,086
Total Loans	415,466	275,096
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	173,384	121,699
Fiscal year before current fiscal year	34,351	62,722
Two years before current fiscal year	57,729	12,821
Three years before current fiscal year	9,276	4,655
Four years before current fiscal year	1,953	2,334
Prior	4,181	3,824
Revolving Loans Amortized Cost Basis	32,294	22,288
Total Loans	313,168	230,343
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	37,275	13,433
Fiscal year before current fiscal year	7,511	11,142
Two years before current fiscal year	13,161	3,973
Three years before current fiscal year	4,526	764
Four years before current fiscal year	803	157
Prior	510	540
Revolving Loans Amortized Cost Basis	37,153	10,798
Total Loans	100,939	40,807
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,273	3,842
Two years before current fiscal year		9
Three years before current fiscal year	6
Total Loans	1,279	3,851
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		64
Two years before current fiscal year	56	9
Three years before current fiscal year	6	22
Four years before current fiscal year	18
Total Loans	80	95
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	221,959	188,717
Fiscal year before current fiscal year	10,350	4,914
Two years before current fiscal year	41	69
Three years before current fiscal year		21
Four years before current fiscal year	18	33
Prior	454	491
Revolving Loans Amortized Cost Basis	21,702	35,948
Total Loans	254,524	230,193
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	193,311	159,432
Fiscal year before current fiscal year	7,786	4,214
Two years before current fiscal year	41	69
Three years before current fiscal year		21
Four years before current fiscal year	18	33
Prior	29	23
Revolving Loans Amortized Cost Basis	16,247	25,918
Total Loans	217,432	189,710
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	28,170	27,400
Fiscal year before current fiscal year	2,564	580
Prior	425	468
Revolving Loans Amortized Cost Basis	5,455	10,030
Total Loans	36,614	38,478
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	478	1,885
Fiscal year before current fiscal year		120
Total Loans	478	2,005
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	302,129	321,317
Fiscal year before current fiscal year	202,546	163,500
Two years before current fiscal year	117,334	111,135
Three years before current fiscal year	80,738	86,271
Four years before current fiscal year	58,207	65,123
Prior	172,124	179,868
Revolving Loans Amortized Cost Basis	3,928	3,362
Total Loans	937,006	930,576
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	256,834	281,908
Fiscal year before current fiscal year	174,718	140,246
Two years before current fiscal year	99,082	87,317
Three years before current fiscal year	64,949	70,541
Four years before current fiscal year	45,211	50,419
Prior	128,898	138,772
Revolving Loans Amortized Cost Basis	3,928	3,362
Total Loans	773,620	772,565
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	44,080	35,924
Fiscal year before current fiscal year	26,073	20,492
Two years before current fiscal year	15,719	21,965
Three years before current fiscal year	12,612	13,447
Four years before current fiscal year	10,926	12,254
Prior	38,230	34,312
Total Loans	147,640	138,394
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,151	2,754
Fiscal year before current fiscal year	1,266	2,029
Two years before current fiscal year	2,054	1,375
Three years before current fiscal year	1,930	2,073
Four years before current fiscal year	1,155	1,213
Prior	3,523	5,194
Total Loans	11,079	14,638
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	64	731
Fiscal year before current fiscal year	489	733
Two years before current fiscal year	479	478
Three years before current fiscal year	1,247	210
Four years before current fiscal year	915	1,186
Prior	1,473	1,590
Total Loans	4,667	4,928
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
Four years before current fiscal year		51
Total Loans		51
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	18,965	25,774
Fiscal year before current fiscal year	16,539	17,814
Two years before current fiscal year	10,722	13,176
Three years before current fiscal year	7,379	8,707
Four years before current fiscal year	5,710	5,984
Prior	14,981	14,766
Revolving Loans Amortized Cost Basis	86,722	86,662
Total Loans	161,018	172,883
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	16,376	21,492
Fiscal year before current fiscal year	13,320	15,461
Two years before current fiscal year	8,691	11,010
Three years before current fiscal year	5,609	6,717
Four years before current fiscal year	4,101	5,381
Prior	12,386	11,037
Revolving Loans Amortized Cost Basis	30,840	29,851
Total Loans	91,323	100,949
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	2,183	3,694
Fiscal year before current fiscal year	2,941	1,675
Two years before current fiscal year	1,919	1,268
Three years before current fiscal year	1,500	1,809
Four years before current fiscal year	895	450
Prior	2,202	2,793
Revolving Loans Amortized Cost Basis	55,000	56,295
Total Loans	66,640	67,984
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	250	384
Fiscal year before current fiscal year	98	461
Two years before current fiscal year	112	328
Three years before current fiscal year	232	116
Four years before current fiscal year	702	119
Prior	309	221
Revolving Loans Amortized Cost Basis	538	494
Total Loans	2,241	2,123
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	156	204
Fiscal year before current fiscal year	180	217
Two years before current fiscal year		570
Three years before current fiscal year	38	65
Four years before current fiscal year	12	34
Prior	84	715
Revolving Loans Amortized Cost Basis	344	22
Total Loans	814	1,827
Real Estate [Member] | Farmland [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	68,244	71,116
Fiscal year before current fiscal year	52,318	58,104
Two years before current fiscal year	48,829	29,842
Three years before current fiscal year	21,863	21,563
Four years before current fiscal year	18,140	19,323
Prior	41,766	36,790
Revolving Loans Amortized Cost Basis	21,019	17,592
Total Loans	272,179	254,330
Real Estate [Member] | Farmland [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	47,485	51,284
Fiscal year before current fiscal year	39,216	27,116
Two years before current fiscal year	23,627	18,993
Three years before current fiscal year	15,180	13,821
Four years before current fiscal year	12,579	13,517
Prior	29,457	27,100
Revolving Loans Amortized Cost Basis	6,946	8,185
Total Loans	174,490	160,016
Real Estate [Member] | Farmland [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	16,063	15,737
Fiscal year before current fiscal year	8,702	30,684
Two years before current fiscal year	23,688	6,639
Three years before current fiscal year	5,488	6,391
Four years before current fiscal year	4,159	4,763
Prior	10,848	8,916
Revolving Loans Amortized Cost Basis	10,455	7,140
Total Loans	79,403	80,270
Real Estate [Member] | Farmland [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	3,587	3,681
Fiscal year before current fiscal year	4,021	290
Two years before current fiscal year	1,514	152
Three years before current fiscal year	74	1,055
Four years before current fiscal year	1,293	703
Prior	1,316	551
Revolving Loans Amortized Cost Basis	3,386	1,955
Total Loans	15,191	8,387
Real Estate [Member] | Farmland [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,109	414
Fiscal year before current fiscal year	379	14
Two years before current fiscal year		4,058
Three years before current fiscal year	1,121	296
Four years before current fiscal year	109	340
Prior	145	223
Revolving Loans Amortized Cost Basis	232	312
Total Loans	3,095	5,657
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	442,949	308,900
Fiscal year before current fiscal year	135,102	190,171
Two years before current fiscal year	111,281	150,412
Three years before current fiscal year	55,683	85,101
Four years before current fiscal year	32,177	55,151
Prior	56,033	60,950
Revolving Loans Amortized Cost Basis	423,262	343,034
Total Loans	1,256,487	1,193,719
Commercial and Agricultural Non-Real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	353,164	225,207
Fiscal year before current fiscal year	102,137	146,263
Two years before current fiscal year	83,615	118,571
Three years before current fiscal year	33,943	77,547
Four years before current fiscal year	27,701	46,687
Prior	43,750	37,767
Revolving Loans Amortized Cost Basis	288,745	256,282
Total Loans	933,055	908,324
Commercial and Agricultural Non-Real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	85,920	64,187
Fiscal year before current fiscal year	30,568	40,901
Two years before current fiscal year	25,097	29,787
Three years before current fiscal year	9,607	6,590
Four years before current fiscal year	2,612	7,054
Prior	10,575	22,710
Revolving Loans Amortized Cost Basis	105,682	73,134
Total Loans	270,061	244,363
Commercial and Agricultural Non-Real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	2,995	18,922
Fiscal year before current fiscal year	2,185	1,400
Two years before current fiscal year	1,347	1,402
Three years before current fiscal year	11,479	723
Four years before current fiscal year	1,291	271
Prior	599	327
Revolving Loans Amortized Cost Basis	26,642	12,659
Total Loans	46,538	35,704
Commercial and Agricultural Non-Real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	870	584
Fiscal year before current fiscal year	212	1,607
Two years before current fiscal year	1,222	652
Three years before current fiscal year	654	241
Four years before current fiscal year	573	1,139
Prior	1,109	146
Revolving Loans Amortized Cost Basis	2,193	959
Total Loans	6,833	5,328
Consumer Non-real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	222,450	182,645
Fiscal year before current fiscal year	88,564	104,625
Two years before current fiscal year	50,662	46,413
Three years before current fiscal year	20,026	14,269
Four years before current fiscal year	6,639	7,460
Prior	3,429	2,137
Revolving Loans Amortized Cost Basis	21,600	18,715
Total Loans	413,370	376,264
Consumer Non-real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	201,893	168,544
Fiscal year before current fiscal year	80,616	94,375
Two years before current fiscal year	43,793	41,715
Three years before current fiscal year	17,587	13,157
Four years before current fiscal year	5,723	6,831
Prior	2,048	1,768
Revolving Loans Amortized Cost Basis	20,600	18,132
Total Loans	372,260	344,522
Consumer Non-real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	19,349	13,444
Fiscal year before current fiscal year	7,551	9,123
Two years before current fiscal year	6,119	4,104
Three years before current fiscal year	2,167	842
Four years before current fiscal year	816	507
Prior	1,342	266
Revolving Loans Amortized Cost Basis	996	574
Total Loans	38,340	28,860
Consumer Non-real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,146	568
Fiscal year before current fiscal year	307	840
Two years before current fiscal year	551	450
Three years before current fiscal year	203	175
Four years before current fiscal year	86	75
Prior	31	63
Revolving Loans Amortized Cost Basis	4	2
Total Loans	2,328	2,173
Consumer Non-real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	62	89
Fiscal year before current fiscal year	90	287
Two years before current fiscal year	199	144
Three years before current fiscal year	69	95
Four years before current fiscal year	14	47
Prior	8	40
Revolving Loans Amortized Cost Basis		7
Total Loans	442	709
Oil and Gas [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	212,863	240,492
Fiscal year before current fiscal year	35,874	31,395
Two years before current fiscal year	20,488	21,870
Three years before current fiscal year	3,914	926
Four years before current fiscal year	259	558
Prior	543	4,874
Revolving Loans Amortized Cost Basis	154,967	128,751
Total Loans	428,908	428,866
Oil and Gas [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	188,072	151,000
Fiscal year before current fiscal year	26,090	19,288
Two years before current fiscal year	6,579	15,589
Three years before current fiscal year	1,257	464
Four years before current fiscal year	89	25
Prior	73	4,777
Revolving Loans Amortized Cost Basis	139,687	92,123
Total Loans	361,847	283,266
Oil and Gas [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	17,150	73,882
Fiscal year before current fiscal year	9,774	11,996
Two years before current fiscal year	13,909	6,217
Three years before current fiscal year	2,657	396
Four years before current fiscal year	170	169
Prior	215	81
Revolving Loans Amortized Cost Basis	13,186	34,210
Total Loans	57,061	126,951
Oil and Gas [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	6,641	9,010
Fiscal year before current fiscal year	10	111
Two years before current fiscal year		64
Three years before current fiscal year		66
Four years before current fiscal year		364
Prior	255
Revolving Loans Amortized Cost Basis	2,024	2,418
Total Loans	8,930	12,033
Oil and Gas [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	1,000	6,600
Prior		16
Revolving Loans Amortized Cost Basis	70
Total Loans	1,070	6,616
Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	110,113	685,426
Fiscal year before current fiscal year	38,387	32,392
Two years before current fiscal year	28,291	25,802
Three years before current fiscal year	20,244	23,698
Four years before current fiscal year	16,095	17,765
Prior	9,553	12,620
Revolving Loans Amortized Cost Basis	27,738	24,375
Total Loans	250,421	822,078
Other Loans [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	109,830	685,426
Fiscal year before current fiscal year	38,379	32,392
Two years before current fiscal year	28,176	25,707
Three years before current fiscal year	20,171	20,638
Four years before current fiscal year	13,908	16,378
Prior	8,425	10,341
Revolving Loans Amortized Cost Basis	26,076	22,976
Total Loans	244,965	813,858
Other Loans [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
Current fiscal year	283
Two years before current fiscal year		17
Three years before current fiscal year	73	2,936
Four years before current fiscal year	2,187	1,126
Prior	1,041	2,179
Revolving Loans Amortized Cost Basis	488	692
Total Loans	4,072	6,950
Other Loans [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Two years before current fiscal year		78
Four years before current fiscal year		53
Prior	43	67
Revolving Loans Amortized Cost Basis	1,073	36
Total Loans	1,116	234
Other Loans [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
Fiscal year before current fiscal year	8
Two years before current fiscal year	115
Three years before current fiscal year		124
Four years before current fiscal year		208
Prior	44	33
Revolving Loans Amortized Cost Basis	101	671
Total Loans	$ 268	$ 1,036

Loans Held for Investment an_11

Loans Held for Investment and Allowance for Credit Losses on Loans - Activity in Allowance for Credit Losses on Loans (Detail) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	$ 54,238	$ 91,366	$ 54,238
Decrease in allowance for credit losses upon adoption of ASC 326	(3,200)		(3,195)
Initial allowance on loans purchased with credit deterioration		8,299	502
Charge- offs		(7,845)	(23,832)
Recoveries		806	1,005
Net charge-offs		(7,039)	(22,827)
Provision for credit losses on loans		(8,690)	62,648	$ 8,287
Balance at end of period		83,936	91,366	54,238
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	5,600	6,911	5,600
Decrease in allowance for credit losses upon adoption of ASC 326			(2,704)
Initial allowance on loans purchased with credit deterioration		1,080	432
Charge- offs		(38)	(773)
Recoveries		74	10
Net charge-offs		36	(763)
Provision for credit losses on loans		(1,617)	4,346
Balance at end of period		6,410	6,911	5,600
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	8,459	12,318	8,459
Decrease in allowance for credit losses upon adoption of ASC 326			(5,265)
Initial allowance on loans purchased with credit deterioration		824
Charge- offs		(803)	(3,609)
Recoveries		67
Net charge-offs		(736)	(3,609)
Provision for credit losses on loans		4,581	12,733
Balance at end of period		16,987	12,318	8,459
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	2,276	2,723	2,276
Decrease in allowance for credit losses upon adoption of ASC 326			(916)
Initial allowance on loans purchased with credit deterioration		173
Charge- offs			(59)
Recoveries		12	123
Net charge-offs		12	64
Provision for credit losses on loans		582	1,299
Balance at end of period		3,490	2,723	2,276
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	1,960	726	1,960
Decrease in allowance for credit losses upon adoption of ASC 326			(690)
Charge- offs			(29)
Net charge-offs			(29)
Provision for credit losses on loans		366	(515)
Balance at end of period		1,092	726	1,960
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	8,781	2,822	8,781
Decrease in allowance for credit losses upon adoption of ASC 326			(3,052)
Initial allowance on loans purchased with credit deterioration		126	7
Charge- offs		(87)	(465)
Recoveries		55	44
Net charge-offs		(32)	(421)
Provision for credit losses on loans		160	(2,493)
Balance at end of period		3,076	2,822	8,781
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	2,763	2,236	2,763
Decrease in allowance for credit losses upon adoption of ASC 326			(1,383)
Charge- offs		(521)	(126)
Recoveries		52	54
Net charge-offs		(469)	(72)
Provision for credit losses on loans		337	928
Balance at end of period		2,104	2,236	2,763
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	12,310	33,020	12,310
Decrease in allowance for credit losses upon adoption of ASC 326			13,949
Initial allowance on loans purchased with credit deterioration		5,663	62
Charge- offs		(4,509)	(4,161)
Recoveries		218	540
Net charge-offs		(4,291)	(3,621)
Provision for credit losses on loans		(8,319)	10,320
Balance at end of period		26,073	33,020	12,310
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	3,284	3,542	3,284
Decrease in allowance for credit losses upon adoption of ASC 326			(548)
Initial allowance on loans purchased with credit deterioration		38
Charge- offs		(864)	(1,142)
Recoveries		326	224
Net charge-offs		(538)	(918)
Provision for credit losses on loans		692	1,724
Balance at end of period		3,734	3,542	3,284
Oil and Gas [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	3,355	20,733	3,355
Decrease in allowance for credit losses upon adoption of ASC 326			(1,068)
Charge- offs			(11,245)
Net charge-offs			(11,245)
Provision for credit losses on loans		(7,755)	29,691
Balance at end of period		12,978	20,733	3,355
Other Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	2,632	3,182	2,632
Decrease in allowance for credit losses upon adoption of ASC 326			(116)
Charge- offs		(134)	(168)
Recoveries		1	10
Net charge-offs		(133)	(158)
Provision for credit losses on loans		121	824
Balance at end of period		3,170	3,182	2,632
Farmland [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	$ 2,818	3,153	2,818
Decrease in allowance for credit losses upon adoption of ASC 326			(1,402)
Initial allowance on loans purchased with credit deterioration		395	1
Charge- offs		(889)	(2,055)
Recoveries		1
Net charge-offs		(888)	(2,055)
Provision for credit losses on loans		2,162	3,791
Balance at end of period		$ 4,822	$ 3,153	$ 2,818

Loans Held for Investment an_12

Loans Held for Investment and Allowance for Credit Losses on Loans - Purchased Credit Deteriorated Loans (Detail) - Loans Acquired with Deteriorated Credit Quality [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Purchase price of loans at acquisition	$ 39,284	$ 1,761
Allowance for credit losses at acquisition	8,299	502
Par value of acquired loans at acquisition	$ 47,583	$ 2,263

Loans Held for Investment an_13

Loans Held for Investment and Allowance for Credit Losses on Loans - Collateral-dependent Gross Loans Held for Investment by Collateral Type and Related Specific Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	$ 24,857	$ 20,803
Real Estate Asset [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	13,129	11,808
Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	6,472	8,473
Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	5,256	522
Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	7,923	6,212
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,952	848
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,404	4,719
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	871	2,117
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	199	866
Real Estate [Member] | Farmland [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	8,703	3,258
Real Estate [Member] | Real Estate Asset [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,952	848
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	1,404	4,719
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	871	2,117
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	199	866
Real Estate [Member] | Real Estate Asset [Member] | Farmland [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	8,703	3,258
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	576	226
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	263	1,000
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	143	373
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	178	616
Real Estate [Member] | Specific Allocation [Member] | Farmland [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,805	1,114
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	11,565	8,873
Commercial and Agricultural Non-Real Estate [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	6,363	8,460
Commercial and Agricultural Non-Real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	5,202	413
Commercial and Agricultural Non-Real Estate [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	4,867	2,813
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	54	109
Consumer Non-real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	54	109
Consumer Non-real Estate [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	20	58
Other Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	109	13
Other Loans [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	109	13
Other Loans [Member] | Specific Allocation [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	$ 71	$ 12

Loans Held for Investment an_14

Loans Held for Investment and Allowance for Credit Losses on Loans - Transfers from Loans and Premises and Equipment to Other Real Estate Owned, Repossessed Assets and Other Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Noncash Investing and Financing Items [Abstract]
Other real estate owned	$ 12,651	$ 32,093	$ 3,941
Repossessed assets	844	1,418	1,473
Other assets		11,105
Total	$ 13,495	$ 44,616	$ 5,414

Loans Held for Investment an_15

Loans Held for Investment and Allowance for Credit Losses on Loans - Related Party Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Balance Beginning of the Period	$ 22,057	$ 20,281	$ 19,891
Additions	31,574	19,682	12,371
Collections/ Terminations	(25,339)	(17,906)	(11,981)
Balance End of the Period	$ 28,292	$ 22,057	$ 20,281

Premises and Equipment, Net a_3

Premises and Equipment, Net and Other Assets - Summary of Premises and Equipment by Classification (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Accumulated depreciation	$ (133,672)	$ (134,022)
Premises and equipment, net	269,047	261,677
Land [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	44,588	45,792
Buildings [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	$ 256,738	201,606
Buildings [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	10 years
Buildings [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	40 years
Furniture Fixtures and Equipment [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	$ 89,058	87,001
Furniture Fixtures and Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	3 years
Furniture Fixtures and Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	15 years
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	$ 12,335	$ 61,300

Premises and Equipment, Net a_4

Premises and Equipment, Net and Other Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Noncash construction in progress for retainage payable	$ 1,000,000
Cash surrender value of life insurance policies	$ 81,400,000	$ 80,700,000
Percentage of equity investment	50.00%
Low income housing tax credit investments	$ 20,100,000	18,100,000
Tax credits and other tax benefits recognized from LIHTC investments	6,500,000	5,600,000	$ 5,400,000
Equity securities	10,600,000	10,100,000
Other assets in equity interest	16,400,000	11,100,000
Amortization expense resulting from LIHTC investments	5,500,000	4,600,000	4,500,000
Unfunded commitment on investments	$ 17,000,000
Percentage of qualified investment	39.00%
Period of qualified investments taken	7 years
New market tax credit investments	$ 15,200,000	18,500,000
Tax credits and other tax benefits recognized from NMTC investments	4,000,000	4,000,000	4,500,000
Amortization expense resulting from NMTC investments	3,300,000	$ 3,300,000	$ 3,700,000
Unfunded commitment on NMTC investments	$ 0

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 30,783	$ 36,761
Accumulated Amortization	(13,217)	(17,762)
Net Carrying Amount	17,566	18,999
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,433	33,411
Accumulated Amortization	(10,311)	(15,076)
Net Carrying Amount	17,122	18,335
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,350	3,350
Accumulated Amortization	(2,906)	(2,686)
Net Carrying Amount	$ 444	$ 664

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 05, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Weighted-average life		6 years 7 months 6 days
Goodwill		$ 149,922	$ 149,922	$ 148,604
Citizens Bankshares, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Date of acquisition	Mar. 5, 2020
Goodwill	$ 1,300
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average life		3 years 6 months
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average life		6 years 8 months 12 days

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Estimated Amortization of Intangible Assets (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2022	$ 2,879
2023	2,862
2024	2,862
2025	2,645
2026	$ 2,033

Intangible Assets and Goodwil_5

Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Balance at beginning of period	$ 149,922	$ 148,604
Acquisitions		1,318
Balance at end of period	149,922	149,922
Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	13,767	13,767
Balance at end of period	13,767	13,767
Community Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	61,212	59,894
Acquisitions		1,318
Balance at end of period	61,212	61,212
Pegasus Bank [Member]
Goodwill [Line Items]
Balance at beginning of period	68,855	68,855
Balance at end of period	68,855	68,855
Other Financial Services [Member]
Goodwill [Line Items]
Balance at beginning of period	5,464	5,464
Balance at end of period	5,464	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at beginning of period	624	624
Balance at end of period	$ 624	$ 624

Time Deposits - Summary of Sche

Time Deposits - Summary of Scheduled Maturities of all Time Deposits (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Deposits [Abstract]
2021	$ 465,804
2022	95,294
2023	34,946
2024	19,649
2025	19,273
Total	$ 634,966

Time Deposits - Summary of time

Time Deposits - Summary of time Deposits Meet or Exceed Current Federal Deposit Insurance Corporation Insurance Limit for Periods Presented (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Time deposits of $250,000 or more	$ 150,393	$ 154,646

Short-Term Borrowings - Summary

Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Short-term borrowings	$ 0	$ 1,100
Weighted average interest rate	0.08%	0.30%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term borrowings		$ 1,100
Short-term Debt [Member]
Short-term Debt [Line Items]
End of period interest rate	0.10%	0.05%

Line of Credit - Additional Inf

Line of Credit - Additional Information (Detail)	Dec. 31, 2021USD ($)
Debt Instrument [Line Items]
Maximum drawing capacity	$ 672,200,000
FHLB stock holdings	651,100
Advances outstanding	0
Residential Mortgage [Member]
Debt Instrument [Line Items]
Line of credit assets pledged as collateral	860,800,000
Revolving Line of Credit Member] | BancFirst [Member]
Debt Instrument [Line Items]
Maximum drawing capacity	25,000,000
Revolving Line of Credit Member] | Pegasus Bank [Member]
Debt Instrument [Line Items]
Maximum drawing capacity	$ 20,000,000

Subordinated Debt - Additional

Subordinated Debt - Additional Information (Detail) - USD ($)	Jun. 17, 2021	Mar. 31, 2004	Feb. 29, 2004	Dec. 31, 2021
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 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%

Income Taxes - Components of th

Income Taxes - Components of the Company's Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current taxes:
Federal	$ 28,359	$ 25,974	$ 26,247
State	5,365	7,443	7,288
Deferred taxes	7,044	(9,491)	1,148
Total income taxes	$ 40,768	$ 23,926	$ 34,683

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Securities transactions income tax (benefit) expense	$ 220,000	$ (82,000)	$ 171,000
Federal tax rate, percentage	21.00%	21.00%	21.00%
Recognition of interest and penalties related to unrecognized tax benefits	$ 0	$ 0	$ 0
Amended Open tax	2023
Earliest Tax Year [Member]
Income Taxes [Line Items]
Year under examination	2018			2018
Latest Tax Year [Member]
Income Taxes [Line Items]
Year under examination	2020

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Tax Expense at the Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax expense at the federal statutory tax rate	$ 43,764	$ 25,937	$ 35,377
Increase (decrease) in tax expense from:
Tax-exempt income, net	(436)	(507)	(581)
Modified endowment life contracts	(501)	(508)	(519)
Share based compensation excess tax benefit	(1,643)	(412)	(765)
Tax deductible dividends paid on ESOP	(490)	(453)
State tax expense, net of federal tax benefit	4,779	5,606	5,757
Bargain purchase gain	(1,007)
Utilization of tax credits:
New markets tax credits, net of tax expense	(3,192)	(3,121)	(3,547)
Low-income housing tax credits, net of amortization	(1,533)	(1,273)	(1,266)
Other tax credits	(379)	(320)
Other, net	1,406	(1,023)	227
Total income taxes	$ 40,768	$ 23,926	$ 34,683

Income Taxes - Summary of Net D

Income Taxes - Summary of Net Deferred Tax Asset Reported in Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision for credit losses	$ 17,654	$ 22,500
Write-downs of other real estate owned	255	143
Deferred compensation	2,320	2,325
Stock-based compensation	1,575	1,672
Investments in partnership interests	3,840	4,695
Other	901	405
Gross deferred tax assets	26,545	31,740
Unrealized net gains on securities	(684)	(2,513)
Premium on securities of banks acquired	(120)	(144)
Intangibles	(5,756)	(6,135)
Basis difference related to tax credits	(2,979)	(2,127)
Depreciation	(14,545)	(11,529)
Prepaid expense deducted	(1,120)	(1,208)
Other	(169)	(178)
Gross deferred tax liabilities	(25,373)	(23,834)
Net deferred tax asset	$ 1,172	$ 7,906

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash settlement for stock options, number of shares	121,330
Net cash settlement for stock options, cost	$ 5.5
Deferred board fees percentage for stock units accumulation	100.00%
Nonqualified Incentive Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period in years	7 years
Nonqualified Incentive Stock Option Plan [Member] | Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares for future grants	158,500
Stock option plan termination date	Dec. 31, 2024
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	The options vest and are exercisable beginning four years from the date of grant at the rate of 25% per year for four years. Options expire no later than the end of fifteen years from the date of grant.
Nonqualified Incentive Stock Option Plan [Member] | Stock Option [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price percentage to fair value at grant date	100.00%
Non-Employee Directors Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares for future grants	40,000
Stock option plan termination date	Dec. 31, 2024
Option exercisable rate	25.00%
Options expire period	15 years
Options vest and exercisable Description	The options vest and are exercisable beginning one year from the date of grant at the rate of 25% per year for four years
Number of options granted for non-employee director	10,000
Vesting period in years	4 years
Non-Employee Directors Stock Option Plan [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price percentage to fair value at grant date	100.00%
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	34,125
Number of shares of common stock distributed	5,400	8,218

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Outstanding at beginning period - Options	1,343,080	1,257,730
Options granted	179,500	171,000
Options exercised	(214,330)	(76,650)
Options canceled, forfeited, or expired	(5,000)	(9,000)
Outstanding at ending period - Options	1,303,250	1,343,080
Exercisable at ending period - Options	614,875	710,330
Outstanding at beginning period - Wgtd. Avg. Exercise Price	$ 35.28	$ 32.70
Options granted - Wgtd. Avg. Exercise Price	62.13	48.89
Options exercised - Wgtd. Avg. Exercise Price	23.40	20.53
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price	44.23	58.26
Outstanding at ending period - Wgtd. Avg. Exercise Price	40.90	35.28
Exercisable at ending period - Wgtd. Avg. Exercise Price	$ 28.03	$ 25.06
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	8 years 4 months 24 days	8 years 7 months 9 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	7 years 1 month 24 days	6 years 11 months 8 days
Outstanding at ending period - Aggregate Intrinsic Value	$ 38,656	$ 31,453
Exercisable at ending period - Aggregate Intrinsic Value	$ 26,153	$ 23,894

Stock-Based Compensation - Opti

Stock-Based Compensation - Options Exercised Under Stock Option Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of options exercised	$ 9,264	$ 2,315	$ 3,982
Cash received from options exercised	5,015	1,574	2,282
Tax benefit realized from options exercised	$ 2,360	$ 590	$ 1,014

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Employee Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement Compensation Expense Items [Abstract]
Stock-based compensation expense	$ 2,133	$ 1,516	$ 1,277
Tax benefit	513	386	325
Stock-based compensation expense, net of tax	$ 1,620	$ 1,130	$ 952

Stock-Based Compensation - Unea

Stock-Based Compensation - Unearned Stock-based Compensation Expense (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Share-based Payment Arrangement, Noncash Expense [Abstract]
Unearned stock-based compensation expense	$ 7,109

Stock-Based Compensation - Assu

Stock-Based Compensation - Assumptions Used for Computing Stock-Based Compensation Expense (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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	$ 21.16	$ 10.85	$ 13.34
Risk-free interest rate, minimum	1.30%	0.64%	1.55%
Risk-free interest rate, maximum	1.74%	1.13%	2.76%
Dividend yield	2.00%	2.00%	2.00%
Stock price volatility, minimum	35.55%	22.84%	22.93%
Stock price volatility, maximum	36.39%	36.10%	23.63%
Expected term	10 years	10 years	10 years

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Accumulated Stock Units (Detail) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Accumulated stock units	152,754	148,278
Average price	$ 30.86	$ 28.57

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Number of retirement plans	2
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Maximum legal limit of employer contribution to plan	3.00%

Retirement Plans - Aggregate Am

Retirement Plans - Aggregate Amounts of Contributions to the 401(k) and ESOP Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Total contributions	$ 7,173	$ 6,675	$ 6,929
401(k) contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Aggregate amounts of contributions	2,856	2,986	2,526
ESOP contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Aggregate amounts of contributions	$ 4,317	$ 3,689	$ 4,403

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Authorized Outstanding Preferred and Common Stock (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares outstanding	32,603,118	32,719,852	32,694,268
Common stock, par value	$ 1	$ 1
Common stock dividend payment terms	As declared
Common stock, voting rights	Voting
Senior Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0
Preferred stock, par value	$ 1	$ 1
Preferred stock, dividend payment terms	As declared
Preferred stock, voting rights	Voting
Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized	900,000	900,000
Preferred stock, shares outstanding	0
Preferred stock, par value	$ 5	$ 5
Preferred stock, dividend payment terms	As declared
Preferred stock, voting rights	Non-voting

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2022	Jun. 17, 2021
Stockholders Equity [Line Items]
Additional shares to repurchase	650,000
Increase to retained earnings for cumulative effect of adopting ASU		$ 977,067,000	$ 871,161,000
Subordinated Notes due 2036 [Member] | Private Placement [Member]
Stockholders Equity [Line Items]
Aggregate principal amount					$ 60,000,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program Lending Facility [Member]
Stockholders Equity [Line Items]
Percentage of risk weight under risk based capital rules		0.00%
Cumulative Effect Period of Adoption Adjustment [Member]
Stockholders Equity [Line Items]
Increase to retained earnings for cumulative effect of adopting ASU			$ 2,300,000
Accounting Standards Update [Extensible List]			ASC 326 [Member]
Maximum [Member]
Stockholders Equity [Line Items]
Quantitative limit for trust preferred securities to be included in tier 1 capital		$ 15,000,000,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Available equity of BancFirst for dividend payments to the company				$ 153,300,000
Senior Preferred Stock [Member]
Stockholders Equity [Line Items]
Preferred stock, shares issued		0	0
Preferred stock, shares outstanding		0
Cumulative Preferred Stock [Member]
Stockholders Equity [Line Items]
Preferred stock, shares issued		0	0
Preferred stock, shares outstanding		0
Dividend payable at redemption, per share		$ 5
Cumulative preferred stock dividend rate		10.00%

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Number of shares repurchased	212,296	59,284	26,670
Average price of shares repurchased	$ 54.94	$ 52.26	$ 60.04
Shares remaining to be repurchased	500,486	62,782	122,066

Stockholders' Equity - Required

Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,171,215	$ 997,383
Total Capital To Risk Weighted Assets Actual Ratio	17.30	15.64
Capital Required For Capital Adequacy Amount	$ 541,493	$ 510,110
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8	8
Capital With Capital Conservation Buffer Amount	$ 710,709	$ 669,519
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50	10.50
Common Equity Tier 1 Risk Based Capital Amount	$ 1,002,096	$ 891,534
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	14.80	13.98
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 304,590	$ 286,937
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.50	4.50
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 473,806	$ 446,346
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7	7
Tier 1 Risk Based Capital Amount	$ 1,028,096	$ 917,534
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	15.19	14.39
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 406,120	$ 382,583
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	6	6
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 575,336	$ 541,992
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50	8.50
Tier 1 Capital Amount	$ 1,028,096	$ 917,534
Tier 1 Capital To Average Assets Ratio	9.14	9.63
Tier 1 Capital Required For Capital Adequacy Amount	$ 449,847	$ 380,952
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4	4
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,004,835	$ 898,714
Total Capital To Risk Weighted Assets Actual Ratio	16.75	15.59
Capital Required For Capital Adequacy Amount	$ 479,883	$ 461,142
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8	8
Capital With Capital Conservation Buffer Amount	$ 629,847	$ 605,248
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50	10.50
Capital Required To Be Well Capitalized Amount	$ 599,854	$ 576,427
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10	10
Common Equity Tier 1 Risk Based Capital Amount	$ 909,817	$ 806,478
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	15.17	13.99
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 269,934	$ 259,392
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.50	4.50
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 419,898	$ 403,499
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7	7
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 389,905	$ 374,678
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.50	6.50
Tier 1 Risk Based Capital Amount	$ 929,817	$ 826,478
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	15.50	14.34
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 359,913	$ 345,856
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	6	6
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 509,876	$ 489,963
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50	8.50
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 479,883	$ 461,142
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8	8
Tier 1 Capital Amount	$ 929,817	$ 826,478
Tier 1 Capital To Average Assets Ratio	9.22	9.48
Tier 1 Capital Required For Capital Adequacy Amount	$ 403,460	$ 348,666
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4	4
Tier 1 Capital Required To Be Well Capitalized Amount	$ 504,325	$ 435,833
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5	5
Pegasus Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 88,224	$ 70,922
Total Capital To Risk Weighted Assets Actual Ratio	11.62	11.85
Capital Required For Capital Adequacy Amount	$ 60,765	$ 47,893
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8	8
Capital With Capital Conservation Buffer Amount	$ 79,754	$ 62,860
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50	10.50
Capital Required To Be Well Capitalized Amount	$ 75,956	$ 59,866
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10	10
Common Equity Tier 1 Risk Based Capital Amount	$ 82,056	$ 66,150
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	10.80	11.05
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 34,180	$ 26,940
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.50	4.50
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 53,170	$ 41,906
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7	7
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 49,372	$ 38,913
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.50	6.50
Tier 1 Risk Based Capital Amount	$ 82,056	$ 66,150
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	10.80	11.05
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 45,574	$ 35,920
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	6	6
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 64,563	$ 50,886
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50	8.50
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 60,765	$ 47,893
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8	8
Tier 1 Capital Amount	$ 82,056	$ 66,150
Tier 1 Capital To Average Assets Ratio	6.98	8.10
Tier 1 Capital Required For Capital Adequacy Amount	$ 47,054	$ 32,682
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4	4
Tier 1 Capital Required To Be Well Capitalized Amount	$ 58,817	$ 40,852
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5	5

Net Income Per Common Share - B

Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders	$ 167,630	$ 99,586	$ 134,879
Income available to common stockholders plus assumed exercises of stock options	$ 167,630	$ 99,586	$ 134,879
Income available to common stockholders - Shares	32,716,099	32,672,522	32,639,396
Dilutive effect of stock options - Shares	598,047	538,430	690,448
Income available to common stockholders plus assumed exercises of stock options - Shares	33,314,146	33,210,952	33,329,844
Income available to common stockholders - Per Share Amount	$ 5.12	$ 3.05	$ 4.13
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 5.03	$ 3	$ 4.05

Net Income Per Common Share - A

Net Income Per Common Share - Average Exercise Prices of Options Excluded from Computation of Diluted Net Income Per Common Share (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Abstract]
Shares	189,780	402,575	180,989
Average Exercise Price	$ 60.33	$ 52.72	$ 54.73

Condensed Parent Company Fina_3

Condensed Parent Company Financial Statements - Summary of Balance Sheet of Parent Company (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash	$ 228,819	$ 280,518
Goodwill	149,922	149,922	$ 148,604
Total assets	9,405,612	9,212,357	8,565,758
LIABILITIES AND STOCKHOLDERS' EQUITY
Other liabilities	55,977	51,864
Subordinated debt	85,987	26,804
Stockholders’ equity	1,171,734	1,067,885	$ 1,004,989
Total liabilities and stockholders' equity	9,405,612	9,212,357
Parent Company [Member]
ASSETS
Cash	62,007	9,081
Investments in subsidiaries	1,117,622	1,003,017
Goodwill	69,478	69,478
Core deposit premium	7,627	8,622
Dividends receivable	13,426	12,750
Other assets	1,515	5,331
Total assets	1,271,675	1,108,279
LIABILITIES AND STOCKHOLDERS' EQUITY
Other liabilities	13,954	13,590
Subordinated debt	85,987	26,804
Stockholders’ equity	1,171,734	1,067,885
Total liabilities and stockholders' equity	$ 1,271,675	$ 1,108,279

Condensed Parent Company Fina_4

Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING INCOME
Interest on interest-bearing deposits	$ 4,366	$ 6,049	$ 31,368
OPERATING EXPENSE
Other	54,051	43,859	44,829
Allocated income tax benefit	(40,768)	(23,926)	(34,683)
Amortization of stock-based compensation arrangements of subsidiaries	(2,133)	(1,516)	(1,277)
Net income	167,630	99,586	134,879
Parent Company [Member]
OPERATING INCOME
Dividends from subsidiaries	54,480	50,872	77,559
Interest on interest-bearing deposits	41	1	1,150
Other	1,071	886	451
Total operating income	55,592	51,759	79,160
OPERATING EXPENSE
Interest	3,130	1,965	1,965
Other	3,340	3,317	5,017
Total operating expense	6,470	5,282	6,982
Income before taxes	49,122	46,477	72,178
Allocated income tax benefit	4,191	2,610	2,731
Income before equity in undistributed earnings of subsidiaries	53,313	49,087	74,909
Equity in undistributed earnings of subsidiaries	116,365	51,955	61,194
Amortization of stock-based compensation arrangements of subsidiaries	(2,048)	(1,456)	(1,224)
Net income	$ 167,630	$ 99,586	$ 134,879

Condensed Parent Company Fina_5

Condensed Parent Company Financial Statements - Summary of Cash Flow of Parent Company (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 167,630	$ 99,586	$ 134,879
Adjustments to reconcile to net cash provided by operating activities:
Amortization of stock-based compensation arrangements of subsidiaries	2,133	1,516	1,277
Other, net	(7,363)	7,305	6,740
Net cash provided by operating activities	189,788	154,341	158,958
INVESTING ACTIVITIES
Other, net	9,305	7,820	7,867
Net cash provided by (used in) investing activities	437,031	(897,993)	50,347
FINANCING ACTIVITIES
Common stock acquired	(11,663)	(3,098)	(1,601)
Net cash settlement of options	(5,479)
Cash dividends paid	(45,140)	(42,472)	(39,805)
Proceeds from issuance of subordinated notes, net of debt issuance costs	59,150
Net cash (used in) provided by financing activities	(193,709)	492,283	234,721
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	433,110	(251,369)	444,026
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,616,912	1,868,281	1,424,255
Cash, due from banks and interest-bearing deposits at the end of the period	2,050,022	1,616,912	1,868,281
SUPPLEMENTAL DISCLOSURE
Cash paid during the period for interest	11,993	22,056	54,602
Cash received during the period for income taxes, net	30,600	26,525	30,975
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	167,630	99,586	134,879
Adjustments to reconcile to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(116,365)	(51,955)	(61,194)
Amortization of stock-based compensation arrangements of subsidiaries	2,048	1,456	1,224
Other, net	5,056	188	(440)
Net cash provided by operating activities	58,369	49,275	74,469
INVESTING ACTIVITIES
Payments for investments in subsidiaries	(9,000)	(1,000)	(134,457)
Other, net	4,429	(1,175)	(418)
Net cash provided by (used in) investing activities	(4,571)	(2,175)	(134,875)
FINANCING ACTIVITIES
Issuance of common stock	2,260	1,790	2,484
Common stock acquired	(11,663)	(3,098)	(1,601)
Net cash settlement of options	(5,479)
Cash dividends paid	(45,140)	(42,472)	(39,805)
Proceeds from issuance of subordinated notes, net of debt issuance costs	59,150
Net cash (used in) provided by financing activities	(872)	(43,780)	(38,922)
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	52,926	3,320	(99,328)
Cash, due from banks and interest-bearing deposits at the beginning of the period	9,081	5,761	105,089
Cash, due from banks and interest-bearing deposits at the end of the period	62,007	9,081	5,761
SUPPLEMENTAL DISCLOSURE
Cash paid during the period for interest	3,130	1,966	5,131
Cash received during the period for income taxes, net	$ 4,411	$ 2,812	$ 4,518

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Summary of Financial Instruments with Off-Balance-Sheet Risks (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 2,084,706	$ 1,779,857
Stand-by letters of credit	$ 82,841	$ 96,311

Leases - Schedule of Rent Expen

Leases - Schedule of Rent Expense of Operating Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Rent expense on all property and equipment rented	$ 1,560	$ 1,894	$ 1,633

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Right of use lease asset	$ 5,000	$ 4,400
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Accrued interest receivable and other assets	Accrued interest receivable and other assets
Operating lease liability	$ 4,876	$ 4,300
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued interest payable and other liabilities	Accrued interest payable and other liabilities
Operating lease weighted-average remaining lease term	3 years 6 months
Operating lease weighted-average discount rate	2.60%
Operating lease revenue	$ 4,900	$ 5,300	$ 6,100

Leases - Schedule of Minimum Fu

Leases - Schedule of Minimum Future Commitments of Operating Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
2022	$ 1,405
2023	1,027
2024	664
2025	608
2026	508
Thereafter	1,396
Total lease payments	5,608
Less imputed interest	(732)
Operating lease liability	$ 4,876	$ 4,300

Leases - Scheduled of Minimum F

Leases - Scheduled of Minimum Future Contractual Rent To be Received Under The Remaining Non-Cancelable Term of Operating Leases (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Leases [Abstract]
2022	$ 3,375
2023	2,636
2024	2,574
2025	1,946
2026	1,547
2027-2030	2,921
Total future minimum lease payments	$ 14,999

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 531,523	$ 552,232
Derivative assets	8,946	991
Derivative liabilities	8,237	872
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	457,628	475,236
U.S. Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	21,942	19,638
Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	29,283	15,696
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	6,319	28,948
Asset backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	13,357	12,714
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	2,994
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	457,628	475,236
Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	8,946	991
Derivative liabilities	8,237	872
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	21,942	19,638
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	29,283	15,696
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	5,999	28,793
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	13,357
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	2,994
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	$ 320	155
Level 3 Inputs [Member] | Asset backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale		$ 12,714

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the year	$ 12,869	$ 12,714
Transfers (to)/from level 2	(12,714)	1,643
Purchases	240
Settlements	(75)	(1,473)
Total unrealized losses		(15)
Balance at the end of the period	$ 320	$ 12,869

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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
BancFirst [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans held for sale		21,600,000
Level 2 Inputs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans held for sale	$ 24,776,000	53,719,000
Level 2 Inputs [Member] | BancFirst [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans held for sale		$ 21,600,000

Fair Value Measurements - Asset

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Level 3 [Member] - Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 10,590	$ 10,098
Collateral Dependent Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	13,195	11,347
Repossessed Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	78	291
Other Real Estate Owned [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 7,496	$ 32,066

Fair Value Measurements - Estim

Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
FINANCIAL ASSETS
Federal funds sold, Carrying Amount	$ 800	$ 0
Debt securities held for investment, Carrying Amount	2,977	2,964
Loans, net of allowance for credit losses, Carrying Amount	6,085,506	6,303,140
Debt securities held for investment, Fair Value	2,978	2,984
Loans held for sale, Fair Value	24,776	53,719
FINANCIAL LIABILITIES
Deposits, Carrying Amount	8,091,914	8,064,704
Short-term borrowings, Carrying Amount	0	1,100
Subordinated debt, Carrying Amount	85,987	26,804
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments, Fair Value	3,648	3,115
Letters of credit, Fair Value	621	722
Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents, Carrying Amount	2,050,022	1,616,912
Federal funds sold, Carrying Amount	800
Debt securities held for investment, Carrying Amount	32	59
Loans held for sale, Carrying Amount	24,776	53,719
Cash and cash equivalents, Fair Value	2,050,022	1,616,912
Federal funds sold, Fair Value	800
Debt securities held for investment, Fair Value	33	62
Loans held for sale, Fair Value	24,776	53,719
FINANCIAL LIABILITIES
Deposits, Carrying Amount	8,091,914	8,064,704
Short-term borrowings, Carrying Amount		1,100
Subordinated debt, Carrying Amount	85,987	26,804
Deposits, Fair Value	8,161,553	8,084,695
Short-term borrowings, Fair Value		1,100
Subordinated debt, Fair Value	90,391	30,535
Level 3 Inputs [Member]
FINANCIAL ASSETS
Debt securities held for investment, Carrying Amount	2,945	2,905
Loans, net of allowance for credit losses, Carrying Amount	6,085,506	6,303,140
Debt securities held for investment, Fair Value	2,945	2,922
Loans, net of allowance for credit losses, Fair Value	$ 6,059,716	$ 6,347,803

Derivative Financial Instrume_3

Derivative Financial Instruments - Summary of Notional Amounts and Estimated Fair Values of Oil and Gas Derivative Positions Outstanding (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	$ 8,946	$ 991
Derivative liabilities, Estimated Fair Value	(8,237)	(872)
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	8,946	991
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Estimated Fair Value	(8,237)	(872)
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	2,585	50
Derivative liabilities, Notional Amount	(2,585)	(50)
Derivative assets, Estimated Fair Value	6,563	53
Derivative liabilities, Estimated Fair Value	(6,129)	(43)
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	19,752	4,663
Derivative liabilities, Notional Amount	(19,752)	(4,663)
Derivative assets, Estimated Fair Value	2,383	938
Derivative liabilities, Estimated Fair Value	$ (2,108)	$ (829)

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Company's Recognized Income Related to Activity Included in Other Noninterest Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Oil and Natural Gas Swaps and Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative income	$ 266	$ 50	$ 3

Derivative Financial Instrume_5

Derivative Financial Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Percentage share of total profit	35.00%

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Company's Net Credit Exposure Relating to Oil and Gas Swaps and Options with Bank Counterparties (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Oil and Natural Gas Swaps and Options [Member]
Credit Derivatives [Line Items]
Credit exposure	$ 965

Segment Information - Additiona

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021Business_Unit
Segment Reporting [Abstract]
Number of principal business units	5

Segment Information - Results o

Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 315,657	$ 306,668	$ 281,921
Provision for/(benefit from) credit losses	(8,690)	62,648	8,287
Noninterest income	170,032	137,222	137,229
Depreciation and amortization	20,041	18,424	15,989
Other expenses	265,940	239,306	225,312
Income before taxes	208,398	123,512	169,562
Total assets	9,405,612	9,212,357	8,565,758
Capital expenditures	27,251	66,446	27,054
Operating Segments [Member] | Metropolitan Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	77,840	85,464	86,511
Provision for/(benefit from) credit losses	(5,474)	30,202	2,143
Noninterest income	23,257	18,664	18,608
Depreciation and amortization	2,593	2,639	2,463
Other expenses	39,356	36,746	37,549
Income before taxes	64,622	34,541	62,964
Total assets	2,627,874	2,729,886	2,806,021
Capital expenditures	1,612	1,087	4,349
Operating Segments [Member] | Community Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	180,925	175,757	177,330
Provision for/(benefit from) credit losses	(4,694)	29,827	5,606
Noninterest income	65,600	60,386	64,485
Depreciation and amortization	10,483	10,603	10,218
Other expenses	110,574	111,341	109,044
Income before taxes	130,162	84,372	116,947
Total assets	5,821,220	5,527,611	4,998,247
Capital expenditures	7,390	9,946	11,219
Operating Segments [Member] | Pegasus Bank [Member]
Segment Reporting Information [Line Items]
Net interest income	24,222	21,360	8,657
Provision for/(benefit from) credit losses	1,395	1,916	140
Noninterest income	1,448	1,071	483
Depreciation and amortization	782	760	274
Other expenses	15,317	13,831	4,939
Income before taxes	8,176	5,924	3,787
Total assets	1,045,699	919,572	738,351
Capital expenditures	363	1,775	83
Operating Segments [Member] | Other Financial Services [Member]
Segment Reporting Information [Line Items]
Net interest income	35,244	23,500	5,763
Provision for/(benefit from) credit losses	109	562	(69)
Noninterest income	47,124	41,549	40,270
Depreciation and amortization	557	500	603
Other expenses	60,435	44,918	25,408
Income before taxes	21,267	19,069	20,091
Total assets	71,694	137,122	102,442
Capital expenditures	400	450	1,220
Operating Segments [Member] | Executive, Operations & Support [Member]
Segment Reporting Information [Line Items]
Net interest income	(3,295)	79	3,660
Provision for/(benefit from) credit losses	(26)	141	467
Noninterest income	203,005	118,491	152,320
Depreciation and amortization	5,626	3,922	2,431
Other expenses	41,199	33,588	50,941
Income before taxes	152,911	80,919	102,141
Total assets	1,201,974	1,073,507	950,920
Capital expenditures	17,486	53,188	10,183
Eliminations [Member]
Segment Reporting Information [Line Items]
Net interest income	721	508
Noninterest income	(170,402)	(102,939)	(138,937)
Other expenses	(941)	(1,118)	(2,569)
Income before taxes	(168,740)	(101,313)	(136,368)
Total assets	$ (1,362,849)	$ (1,175,341)	$ (1,030,223)

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail) - USD ($) $ in Thousands	Feb. 08, 2022	Jan. 10, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Total assets			$ 9,405,612	$ 9,212,357	$ 8,565,758
Total loans			6,169,442	6,394,506
Deposits			$ 8,091,914	$ 8,064,704
Subsequent Event [Member] | Worthington National Bank [Member]
Subsequent Event [Line Items]
Purchase price	$ 77,700
Total assets	470,300
Total loans	260,900
Deposits	$ 429,900
Subsequent Event [Member] | United States Treasury Notes [Member]
Subsequent Event [Line Items]
Debt securities. average yield percentage		1.42%
Debt securities purchased at par value		$ 600,000
Debt securities, average maturity term		53 months