BancFirst (BANF) 10-Q 10 Aug 20 2020 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Trading Symbol	BANF
Entity Registrant Name	BancFirst Corporation
Entity Central Index Key	0000760498
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, $1.00 Par Value Per Share
Security Exchange Name	NASDAQ
Entity File Number	0-14384
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1221379
Entity Address, Address Line One	101 N. Broadway
Entity Address, City or Town	Oklahoma City
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	73102-8405
City Area Code	405
Local Phone Number	270-1086
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		32,662,691

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 205,227	$ 222,043
Interest-bearing deposits with banks	1,583,116	1,646,238
Federal funds sold		1,000
Securities held for investment (fair value: $3,048 and $1,903, respectively)	3,055	1,903
Securities available for sale at fair value	604,976	489,723
Loans held for sale	21,902	11,001
Loans (net of unearned interest)	6,674,954	5,662,143
Allowance for credit losses	(89,500)	(54,238)
Loans, net of allowance for credit losses	6,585,454	5,607,905
Premises and equipment, net	232,517	206,275
Other real estate owned	4,668	5,607
Intangible assets, net	20,882	22,608
Goodwill	149,922	148,604
Accrued interest receivable and other assets	200,734	202,851
Total assets	9,612,453	8,565,758
Deposits:
Noninterest-bearing	3,709,330	2,956,370
Interest-bearing	4,777,341	4,527,265
Total deposits	8,486,671	7,483,635
Short-term borrowings	8,100	1,100
Long-term borrowings	3,000
Accrued interest payable and other liabilities	53,679	49,230
Junior subordinated debentures	26,804	26,804
Total liabilities	8,578,254	7,560,769
Stockholders' equity:
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,662,691 and 32,694,268, respectively	32,663	32,694
Capital surplus	154,692	153,353
Retained earnings	837,154	815,488
Accumulated other comprehensive income, net of income tax of $3,278 and $1,187, respectively	9,690	3,454
Total stockholders' equity	1,034,199	1,004,989
Total liabilities and stockholders' equity	9,612,453	8,565,758
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Securities, fair value	$ 3,048	$ 1,903
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	32,662,691	32,694,268
Common stock, shares outstanding	32,662,691	32,694,268
Accumulated other comprehensive loss, tax expense (benefit)	$ 3,278	$ 1,187
Senior Preferred Stock [Member]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Cumulative Preferred Stock [Member]
Preferred stock, par value	$ 5	$ 5
Preferred stock, shares authorized	900,000	900,000
Preferred stock, shares issued	0	0

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INTEREST INCOME
Loans, including fees	$ 78,855	$ 70,990	$ 155,373	$ 139,720
Securities:
Taxable	2,047	3,855	4,633	8,190
Tax-exempt	154	118	252	244
Federal funds sold				2
Interest-bearing deposits with banks	395	8,135	5,164	15,883
Total interest income	81,451	83,098	165,422	164,039
INTEREST EXPENSE
Deposits	3,750	13,802	13,150	27,339
Short-term borrowings	1	12	8	22
Junior subordinated debentures	492	492	983	983
Total interest expense	4,243	14,306	14,141	28,344
Net interest income	77,208	68,792	151,281	135,695
Provision for credit losses	19,333	2,433	38,916	4,117
Net interest income after provision for credit losses	57,875	66,359	112,365	131,578
NONINTEREST INCOME
Securities transactions (includes no accumulated other comprehensive income reclassifications)	(595)	821	(545)	821
Income from sales of loans	1,561	868	2,342	1,566
Insurance commissions	4,443	4,420	10,119	9,685
Cash management	4,255	4,402	8,575	8,178
Gain/(loss) on sale of other assets	49	(7)	135	(11)
Other	2,241	1,209	4,014	2,635
Total noninterest income	32,082	34,077	67,227	66,078
NONINTEREST EXPENSE
Salaries and employee benefits	42,226	36,124	81,982	72,295
Occupancy, net	3,839	2,953	7,385	5,580
Depreciation	3,544	3,015	7,035	6,000
Amortization of intangible assets	968	758	1,932	1,517
Data processing services	1,629	1,262	3,321	2,742
Net income from other real estate owned	(12)	97	(2,147)	(387)
Marketing and business promotion	1,485	1,919	3,840	4,180
Deposit insurance	365	544	501	1,077
Other	10,607	9,936	22,187	19,810
Total noninterest expense	64,651	56,608	126,036	112,814
Income before taxes	25,306	43,828	53,556	84,842
Income tax expense	4,576	9,661	10,218	18,838
Net income	$ 20,730	$ 34,167	$ 43,338	$ 66,004
NET INCOME PER COMMON SHARE
Basic	$ 0.64	$ 1.04	$ 1.33	$ 2.02
Diluted	$ 0.63	$ 1.02	$ 1.31	$ 1.98
OTHER COMPREHENSIVE (LOSS) GAIN
Unrealized (loss) gain on securities, net of tax of $85, $(1,112), $(2,091) and $(1,980) respectively	$ (189)	$ 3,254	$ 6,236	$ 5,794
Comprehensive income	20,541	37,421	49,574	71,798
Trust Revenue [Member]
NONINTEREST INCOME
Revenue	3,368	3,250	7,023	6,427
Service Charges on Deposits [Member]
NONINTEREST INCOME
Revenue	$ 16,760	$ 19,114	$ 35,564	$ 36,777

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Securities transactions accumulated other comprehensive income reclassifications	$ 0	$ 0	$ 0	$ 0
Unrealized gain on securities, tax	$ 85,000	$ (1,112,000)	$ (2,091,000)	$ (1,980,000)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	COMMON STOCK [Member]	CAPITAL SURPLUS [Member]	RETAINED EARNINGS [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
Balance at beginning of period at Dec. 31, 2018		$ 32,604	$ 149,709	$ 722,615	$ (2,139)
Shares issued for stock options		36	745
Net income	$ 66,004			66,004
Dividends on common stock				(19,529)
Stock-based compensation arrangements			541
Net change					5,794
Balance at end of period at Jun. 30, 2019	956,380	32,640	150,995	769,090	3,655
Balance at beginning of period at Mar. 31, 2019		32,618	150,195	744,713	401
Shares issued for stock options		22	433
Net income	34,167			34,167
Dividends on common stock				(9,790)
Stock-based compensation arrangements			367
Net change					3,254
Balance at end of period at Jun. 30, 2019	956,380	32,640	150,995	769,090	3,655
Balance at beginning of period at Dec. 31, 2019	1,004,989	32,694	153,353	815,488	3,454
Shares issued for stock options		28	507
Shares acquired and canceled		(59)		(3,039)
Net income	43,338			43,338
Cumulative effect of change in accounting principle, net of tax of $925 (Note 1)				2,270
Dividends on common stock				(20,903)
Stock-based compensation arrangements			832
Net change					6,236
Balance at end of period at Jun. 30, 2020	1,034,199	32,663	154,692	837,154	9,690
Balance at beginning of period at Mar. 31, 2020		32,647	153,999	826,855	9,879
Shares issued for stock options		16	287
Net income	20,730			20,730
Dividends on common stock				(10,431)
Stock-based compensation arrangements			406
Net change					(189)
Balance at end of period at Jun. 30, 2020	$ 1,034,199	$ 32,663	$ 154,692	$ 837,154	$ 9,690

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cumulative effect of change in accounting principle tax	$ 925
RETAINED EARNINGS [Member]
Dividend on common stock	$ 0.32	$ 0.30	$ 0.64	$ 0.60

Consolidated Statements of Cash

Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 43,338	$ 66,004
Adjustments to reconcile to net cash provided by operating activities:
Provision for credit losses	38,916	4,117
Depreciation and amortization	8,967	7,517
Net amortization of securities premiums and discounts	(340)	(3,650)
Realized securities losses (gains)	545	(821)
Gain on sales of loans	(2,342)	(1,566)
Cash receipts from the sale of loans originated for sale	171,433	98,587
Cash disbursements for loans originated for sale	(179,996)	(99,782)
Deferred income tax benefit	(3,987)	(893)
Gain on sale of other assets	(2,289)	(455)
Increase in interest receivable	(3,438)	(2,064)
(Decrease)/increase in interest payable	(943)	461
Amortization of stock-based compensation arrangements	832	541
Excess tax benefit from stock-based compensation arrangements	(143)	(263)
Other, net	12,094	4,374
Net cash provided by operating activities	82,647	72,107
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	18,397
Net decrease in federal funds sold	1,000
Purchases of held for investment securities	(1,395)	(1,010)
Purchases of available for sale securities	(255,178)
Proceeds from maturities, calls and paydowns of held for investment securities	470	440
Proceeds from maturities, calls and paydowns of available for sale securities	148,365	358,972
Purchase of equity securities	(234)	(2,649)
Proceeds from paydowns and sales of equity securities	437	1,892
Net change in loans	(993,997)	(121,426)
Purchases of premises, equipment and computer software	(30,292)	(12,907)
Purchase of tax credits	(357)	(6,946)
Other, net	5,641	3,053
Net cash (used in) provided by investing activities	(1,107,143)	219,419
FINANCING ACTIVITIES
Net change in deposits	958,030	8,118
Net change in short-term borrowings	7,000	(675)
Proceeds from long-term borrowings	3,000
Issuance of common stock in connection with stock options, net	535	781
Common stock acquired	(3,098)
Cash dividends paid	(20,909)	(19,567)
Net cash provided by (used in) financing activities	944,558	(11,343)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits	(79,938)	280,183
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,868,281	1,424,255
Cash, due from banks and interest-bearing deposits at the end of the period	1,788,343	1,704,438
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	15,053	27,882
Cash paid during the period for income taxes	5,075	17,175
Noncash investing and financing activities:
Fair value of assets acquired in acquisitions	47,838
Liabilities assumed in acquisitions	45,040
Unpaid common stock dividends declared	$ 10,447	$ 9,788

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Description of Business and Summary of Significant Accounting Policies	(1) DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The accounting and reporting policies of BancFirst Corporation and its subsidiaries (the “Company”) conform to accounting principles generally accepted in the United States of America (U.S. GAAP) and general practice within the banking industry. A summary of significant accounting policies can be found in Note (1) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. Basis of Presentation The accompanying unaudited interim consolidated financial statements include the accounts of BancFirst Corporation, Council Oak Partners, LLC, BancFirst Insurance Services, Inc., BancFirst Risk & Insurance Company, 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 and BancFirst Agency, Inc. All significant intercompany accounts and transactions have been eliminated. Assets held in a fiduciary or agency capacity are not assets of the Company and, accordingly, are not included in the unaudited interim consolidated financial statements. The accompanying unaudited interim consolidated financial statements and notes are presented in accordance with U.S. GAAP for interim financial information and the instructions for Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). The information contained in the financial statements and footnotes included in BancFirst Corporation’s Annual Report on Form 10-K for the year ended December 31, 2019, should be referred to in connection with these unaudited interim consolidated financial statements. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. The unaudited interim consolidated financial statements contained herein reflect all adjustments which are, in the opinion of management, necessary to provide a fair statement of the financial position and results of operations of the Company for the interim periods presented. All such adjustments are of a normal and recurring nature. Reclassifications Certain items in prior financial statements have been reclassified to conform to the current presentation. Such reclassifications had no effect on previously reported cash flows, stockholders’ equity or comprehensive income. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States inherently involves the use of estimates and assumptions that affect the amounts reported in the financial statements and the related disclosures. These estimates relate principally to the determination of the allowance for credit losses, income taxes, the fair value of financial instruments and the valuation of intangibles. Such estimates and assumptions may change over time and actual amounts realized may differ from those reported. Recent Accounting Pronouncements Standards Adopted During Current Period: In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018-13, “Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement (Topic 820).” ASU 2018-13 modifies disclosure requirements on fair value measurements in Topic 820. ASU 2018-13 was effective for the Company on January 1, 2020. ASU No. 2018-13 was adopted on January 1, 2020 and did not have a significant impact on the Company’s financial statements. On January 1, 2020, the Company adopted ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” Accounting Standards Codification (“ASC”) 326 replaces the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor in accordance with Topic 842 on leases. In addition, ASC 326 made changes to the accounting for purchased loans and securities with credit deterioration and available-for-sale debt securities. The Company adopted ASC 326 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Operating results for periods from January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards and the accounting policies described in our 2019 Form 10-K. The Company recorded a net increase to retained earnings of $2.3 million, net of tax of $925,000, as of January 1, 2020 for the cumulative effect of adopting ASC 326, and the impact on our results of operations and cash flows was not material. The Company adopted ASC 326 using the prospective transition approach for financial assets purchased with credit deterioration (PCD) that were previously classified as purchased credit impaired (PCI) and accounted for under ASC 310-30. In accordance with the standard, management did not reassess whether PCI assets met the criteria of PCD assets as of the date of adoption. On January 1, 2020, the amortized cost basis of the PCD assets was adjusted to reflect the addition of approximately $1.2 million to the allowance for credit losses. The Company has not recorded an allowance for credit losses against its available-for-sale securities, as the credit risk is not material. The following table illustrates the impact of ASC 326 on the allowance for credit losses on the Company’s loans as of January 1, 2020. January 1, 2020 As Reported Under ASC 326 Pre ASC 326 Adoption Impact of ASC 326 Adoption (Dollars in thousands) BancFirst Real estate: Commercial real estate owner occupied $ 2,819 $ 5,625 $ (2,806 ) Commercial real estate non-owner occupied 2,851 8,358 (5,507 ) Construction and development < 60 months 1,158 2,214 (1,056 ) Construction residential real estate < 60 months 1,155 1,933 (778 ) Residential real estate first lien 4,861 8,692 (3,831 ) Residential real estate all other 1,359 2,767 (1,408 ) Farmland 1,413 2,821 (1,408 ) Commercial and agricultural non-real estate 27,194 15,345 11,849 Consumer non-real estate 2,630 3,252 (622 ) Other loans 2,516 2,632 (116 ) Pegasus Bank 3,087 599 2,488 Allowance for credit losses on loans $ 51,043 $ 54,238 $ (3,195 ) The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. In order to estimate expected losses using historical loss information, the Company elected to utilize a methodology known as vintage loss analysis for substantially all of our loan portfolio. Vintage loss analysis measures impairment based on the age of the accounts and the historical asset performance of assets with similar risk characteristics. Vintage loss analysis accounts for expected losses by allowing the Company to calculate the cumulative loss rates of a given loan pool and in so doing, determine the loan pool’s lifetime expected loss experience. This includes a reasonable approximation of probable and estimable future losses determined by applying historical net charge off information to forward looking qualitative and environmental factors. First, the Company determined the appropriate type of financial assets that share similar risk characteristics, and then the Company developed a cumulative loss curve for the applicable financial assets based on historical data using different “vintages” analyzed by year of origination. This is done by dividing each year’s net charge-offs by the original principal balance. The respective vintage’s original principal balance remains the denominator in each annual calculation, as it references the specific vintage’s original balance. The loss experience of this original balance is tracked annually and summed over the life of the loan for each separate loan pool leaving a cumulative, life of credit loss rate based on historic averages weighted towards more recent loss experience. In addition to life of credit loss data, primary drivers like macroeconomic indicators of qualitative factors are used as adjustments to the expected loss calculation to reach a forecast supported by both quantitative and qualitative data points. The intent is to express the impact of changes in external factors while incorporating analysis of where the loan pool is in its loss history. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not included in the collective evaluation. The Company has made the accounting policy election to use the fair value of the collateral to measure expected credit losses on collateral-dependent financial assets. 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 connection with the adoption of ASC 326, the Company revised certain accounting policies and implemented accounting policy elections. The revised accounting policies are described below. Loans The Company has made the accounting policy election to exclude accrued interest receivable on loans from the estimate of credit losses. 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. Purchased Credit Deteriorated (PCD) Loans Allowance for Credit Losses - Loans 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 under CECL. The Company has identified the following portfolio segments, which includes the applicable weighted average life, and measures the allowance for credit losses using the vintage loss analysis adjusted for qualitative factors: Loan Segment Life (in years) BancFirst 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 6 Farmland 12 Commercial and agricultural non-real estate 3 Consumer non-real estate 4 Other loans 9 Pegasus Bank 4 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, oil and gas, 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. Other loans. Other loans consist of loans approved by the Small Business A dministratio n (SBA), which include loans funded through the Paycheck Protection Program (PPP) . Since PPP loans are fully guaranteed by the SBA, there is no expected credit loss related to these loans. Pegasus Bank. Pegasus Bank’s loans are commercial and consumer loans mostly to customers within Texas secured by real estate. Pegasus Bank also includes commercial and industrial loans, which includes loans to companies in the oil and gas industry. 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 oil and gas prices, national and local unemployment, real gross domestic product (“GDP”), house price index (“HPI”), consumer price index (“CPI”), rental vacancies, and retail sales. 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. Determining the Contractual Term: Troubled Debt Restructurings (TDRs Allowance for Credit Losses on Off-Balance Sheet Credit Exposures Allowance for Credit Losses - Available-for-Sale Securities PPP Fee Income Policy:

Recent Developments, Including

Recent Developments, Including Mergers and Acquisitions	6 Months Ended
	Jun. 30, 2020
Recent Developments Including Mergers And Acquisitions [Abstract]
Recent Developments, Including Mergers and Acquisitions	(2) RECENT DEVELOPMENTS, INCLUDING MERGERS AND ACQUISITIONS 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 COVID-19 that are offered by financial institutions Specifically, 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. As of June 30, 2020, the Company has identified $939.8 million in loans that have been modified according to these terms. 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. In January 2020, the Company sold property held in other real estate owned for a $2.2 million gain. On August 15, 2019 the Company acquired Pegasus Bank, a Texas state-charted bank with three banking locations in Dallas, Texas. This acquisition is disclosed in Note (2) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.

Securities

Securities	6 Months Ended
	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Securities	( 3 ) SECURITIES The following table summarizes the amortized cost and estimated fair values of debt securities held for investment: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value June 30, 2020 (Dollars in thousands) Mortgage backed securities (1) $ 75 $ 4 $ — $ 79 States and political subdivisions 2,480 3 (14 ) 2,469 Other securities 500 — — 500 Total $ 3,055 $ 7 $ (14 ) $ 3,048 December 31, 2019 Mortgage backed securities (1) $ 93 $ 4 $ — $ 97 States and political subdivisions 1,310 1 (5 ) 1,306 Other securities 500 — — 500 Total $ 1,903 $ 5 $ (5 ) $ 1,903 The following table summarizes the amortized cost and estimated fair values of debt securities available for sale: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value June 30, 2020 (Dollars in thousands) U.S. treasuries $ 500,161 $ 12,700 $ — $ 512,861 U.S. federal agencies 21,242 5 (66 ) 21,181 Mortgage backed securities (1) 16,127 455 — 16,582 States and political subdivisions 41,150 497 (9 ) 41,638 Asset backed securities 13,328 — (614 ) 12,714 Total $ 592,008 $ 13,657 $ (689 ) $ 604,976 December 31, 2019 U.S. treasuries $ 409,488 $ 4,974 $ (13 ) $ 414,449 U.S. federal agencies 23,039 23 (38 ) 23,024 Mortgage backed securities (1) 16,941 128 (64 ) 17,005 States and political subdivisions 22,294 282 (45 ) 22,531 Asset backed securities 13,320 — (606 ) 12,714 Total $ 485,082 $ 5,407 $ (766 ) $ 489,723 (1) Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies. The maturities of debt securities held for investment and available for sale are summarized in the following table using contractual maturities. Actual maturities may differ from contractual maturities due to obligations that are called or prepaid. For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been presented at their contractual maturity. June 30, 2020 December 31, 2019 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value (Dollars in thousands) Held for Investment Contractual maturity of debt securities: Within one year $ 880 $ 879 $ 300 $ 300 After one year but within five years 1,581 1,574 1,058 1,055 After five years but within ten years 593 594 543 546 After ten years 1 1 2 2 Total $ 3,055 $ 3,048 $ 1,903 $ 1,903 Available for Sale Contractual maturity of debt securities: Within one year $ 314,154 $ 315,140 $ 186,373 $ 186,539 After one year but within five years 234,514 246,662 252,519 257,430 After five years but within ten years 4,918 5,074 5,873 6,008 After ten years 38,422 38,100 40,317 39,746 Total debt securities $ 592,008 $ 604,976 $ 485,082 $ 489,723 The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law: June 30, 2020 December 31, 2019 (Dollars Book value of pledged securities $ 423,779 $ 445,702

Loans Held for Investment and A

Loans Held for Investment and Allowance for Credit Losses on Loans	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Loans Held for Investment and Allowance for Credit Losses on Loans	( 4 ) LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES ON LOANS In connection with our adoption of ASC 326 Loans held for investment are summarized by portfolio segment as follows: June 30, 2020 December 31, 2019 Amount Amount (Dollars in thousands) BancFirst Real estate: Commercial real estate owner occupied $ 651,416 $ 621,188 Commercial real estate non-owner occupied 990,180 851,200 Construction and development < 60 months 225,598 287,138 Construction residential real estate < 60 months 206,504 189,480 Residential real estate first lien 860,964 834,849 Residential real estate all other 180,839 187,647 Farmland 256,136 246,988 Commercial and agricultural non-real estate 1,470,523 1,499,404 Consumer non-real estate 360,740 359,529 Other loans (2) 987,250 154,015 Pegasus Bank 484,804 430,705 Total (1) $ 6,674,954 $ 5,662,143 (1) Excludes accrued interest receivable of $31.0 million at June 30, 2020 and $27.4 million at December 31, 2019, that is recorded in accrued interest receivable and other assets. (2) Includes PPP loans of $825.1 million, net of unamortized processing fees of $26.2 million, at June 30, 2020. BancFirst’s loans are mostly to customers within Oklahoma and approximately 50% of the 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. BancFirst’s commercial and agricultural non-real estate loan category includes upstream and midstream energy loans and loans to companies that provide ancillary services to the energy industry, such as transportation, preparation contractors and equipment manufacturers. The balance of upstream energy loans was approximately $229 million at June 30, 2020 and approximately $189 million at December 31, 2019. The balance of midstream energy loans was approximately $45 million at June 30, 2020 and approximately $41 million at December 31, 2019. The balance of the ancillary services energy loans was approximately $78 million at June 30, 2020 and approximately $90 million at December 31, 2019. Pegasus Bank’s loans are mostly to customers within Texas and approximately $246 million or 51% of the loans are secured by real estate at June 30, 2020. Pegasus Bank’s commercial and agricultural non-real estate loan were approximately $208 million at June 30, 2020 and approximately $172 million at December 31, 2019. Pegasus Bank’s commercial and agricultural non-real estate loan category includes upstream energy loans and loans to companies that provide ancillary services to the energy industry, such as transportation, preparation contractors and equipment manufacturers. The balance of upstream energy loans was approximately $88 million at June 30, 2020 and approximately $57 million at December 31, 2019. The balance of the ancillary services energy loans was approximately $8 million at June 30, 2020 and approximately $7 million at December 31, 2019. As of June 30, 2020, the Company reported $825.1 million in PPP loans, net of unamortized processing fees of $26.2 million and recognized $3.6 million of processing fees, which were included in interest income. Accounting policies related to appraisals, and charge-offs are disclosed in Note (1) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. Troubled Debt Restructur ings 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: June 30, December 31, 2020 2019 (Dollars in thousands) Troubled debt restructurings $ 3,213 $ 18,010 Other real estate owned and repossessed assets $ 4,948 $ 6,073 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. Nonaccrual loans Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $983,000 for the six months ended June 30, 2020 and approximately $1.0 million for the six months ended June 30, 2019. In addition, approximately $8.0 million of nonaccrual loans are guaranteed by government agencies. The following table is a summary of amounts included in nonaccrual loans, segregated by portfolio segment. Residential real estate refers to one-to-four family real estate. June 30, 2020 (Dollars in thousands) BancFirst Real estate: Commercial real estate owner occupied $ 2,094 Commercial real estate non-owner occupied 463 Construction and development < 60 months 119 Construction residential real estate < 60 months — Residential real estate first lien 3,904 Residential real estate all other 792 Farmland 3,118 Commercial and agricultural non-real estate 32,299 Consumer non-real estate 247 Other loans 5,841 Pegasus Bank 600 Total $ 49,477 December 31, 2019 (Dollars in thousands) BancFirst Real estate: Non-residential real estate owner occupied $ 2,275 Non-residential real estate other 1,815 Residential real estate permanent mortgage 1,206 Residential real estate all other 3,060 Non-consumer non-real estate 2,915 Consumer non-real estate 264 Other loans 1,083 Acquired loans 4,496 Pegasus Bank 851 Total $ 17,965 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 Days Past Due 60-89 Days Past Due 90 Days and Greater Total Past Due Loans Current Loans Total Loans Accruing Loans 90 Days or More Past Due (Dollars in thousands) As of June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 415 $ 55 $ 2,037 $ 2,507 $ 648,909 $ 651,416 $ 77 Commercial real estate non-owner occupied 50 112 188 350 989,830 990,180 — Construction and development < 60 months 952 — — 952 224,646 225,598 — Construction residential real estate < 60 months 396 — — 396 206,108 206,504 — Residential real estate first lien 3,587 1,316 4,575 9,478 851,486 860,964 1,945 Residential real estate all other 449 171 766 1,386 179,453 180,839 63 Farmland 1,649 888 3,257 5,794 250,342 256,136 763 Commercial and agricultural non-real estate 19,056 4,766 4,841 28,663 1,441,860 1,470,523 2,154 Consumer non-real estate 1,712 595 465 2,772 357,968 360,740 313 Other loans 219 162 5,621 6,002 981,248 987,250 67 Pegasus Bank — — 600 600 484,204 484,804 — Total $ 28,485 $ 8,065 $ 22,350 $ 58,900 $ 6,616,054 $ 6,674,954 $ 5,382 As of December 31, 2019 BancFirst Real estate: Non-residential real estate owner occupied $ 1,600 $ 967 $ 5,159 $ 7,726 $ 699,690 $ 707,416 $ 3,799 Non-residential real estate other 971 — 1,228 2,199 1,134,976 1,137,175 — Residential real estate permanent mortgage 4,705 973 2,215 7,893 332,679 340,572 1,660 Residential real estate other 4,496 1,028 2,541 8,065 912,767 920,832 549 Non-consumer non-real estate 2,290 1,446 1,763 5,499 1,448,894 1,454,393 354 Consumer other 2,829 858 592 4,279 358,075 362,354 491 Other loans 1,670 8 4,613 6,291 147,724 154,015 4,426 Acquired loans 2,167 1,376 3,447 6,990 147,691 154,681 555 Pegasus Bank — — 851 851 429,854 430,705 — Total $ 20,728 $ 6,656 $ 22,409 $ 49,793 $ 5,612,350 $ 5,662,143 $ 11,834 Due to the impacts of the COVID-19 pandemic, the Company has modified approximately $939.8 million in loans, most of which are 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. Consequently, it is reasonable to expect that when temporary regulatory accounting relief and payment modifications cease, there will be a marked increase in credit impairment and restructured loans. The timing and extent of such consequences are impossible 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. 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 disclosed in Note (5) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. The Company’s revolving loans that are converted to term loans are not material and therefore have not been presented. The following table summarizes our gross loans held for investment by year of origination and internally assigned credit grades: Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total (Dollars in thousands) As of June 30, 2020 BancFirst Commercial real estate owner occupied Grade 1 $93,204 $115,392 $88,126 $56,119 $43,573 $117,406 $9,505 $523,325 Grade 2 16,310 31,307 12,723 10,742 13,926 29,741 3,324 118,073 Grade 3 142 107 599 1,583 495 1,380 2,742 7,048 Grade 4 47 78 879 — 392 1,107 467 2,970 Total commercial real estate owner occupied loans 109,703 146,884 102,327 68,444 58,386 149,634 16,038 651,416 Commercial real estate non-owner occupied Grade 1 188,253 178,055 105,465 90,957 91,046 107,176 13,590 774,542 Grade 2 25,466 68,282 18,066 23,070 11,432 52,193 3,712 202,221 Grade 3 1,126 3,929 7,118 543 42 155 70 12,983 Grade 4 — 94 191 — — 149 — 434 Total commercial real estate non-owner occupied loans 214,845 250,360 130,840 114,570 102,520 159,673 17,372 990,180 Construction and development < 60 months Grade 1 66,608 76,743 28,386 5,535 2,880 4,081 14,229 198,462 Grade 2 12,612 8,249 1,698 853 166 568 442 24,588 Grade 3 34 2,211 184 — — — — 2,429 Grade 4 — 70 10 24 — — — 104 Grade 5 15 — — — — — — 15 Total construction and development < 60 months 79,269 87,273 30,278 6,412 3,046 4,649 14,671 225,598 Construction residential real estate < 60 months Grade 1 94,678 72,479 69 22 37 32 4,727 172,044 Grade 2 18,660 11,920 114 — — 481 32 31,207 Grade 3 1,416 1,440 397 — — — — 3,253 Total construction residential real estate < 60 months 114,754 85,839 580 22 37 513 4,759 206,504 Residential real estate first lien Grade 1 135,181 176,422 94,426 76,299 56,326 169,576 — 708,230 Grade 2 16,067 26,417 23,633 12,417 13,232 37,470 — 129,236 Grade 3 3,796 2,195 1,597 1,737 2,340 6,592 — 18,257 Grade 4 88 815 858 301 1,105 2,023 — 5,190 Grade 5 — — — — 51 — — 51 Total residential real estate first lien 155,132 205,849 120,514 90,754 73,054 215,661 — 860,964 Residential real estate all other Grade 1 13,054 17,126 13,224 9,660 6,747 13,647 32,726 106,184 Grade 2 2,064 2,381 1,545 1,997 415 2,999 59,063 70,464 Grade 3 180 890 996 161 226 386 311 3,150 Grade 4 52 — 74 51 34 720 40 971 Grade 5 — 70 — — — — — 70 Total residential real estate all other 15,350 20,467 15,839 11,869 7,422 17,752 92,140 180,839 Farmland Grade 1 27,303 32,686 22,385 16,365 15,894 35,182 7,696 157,511 Grade 2 7,741 34,758 7,341 7,582 6,262 10,985 8,486 83,155 Grade 3 748 625 5,313 1,109 584 1,353 3,320 13,052 Grade 4 — — 758 639 381 379 261 2,418 Total farmland 35,792 68,069 35,797 25,695 23,121 47,899 19,763 256,136 Commercial and agricultural non-real estate Grade 1 245,805 218,847 148,454 114,049 56,916 48,438 310,921 1,143,430 Grade 2 52,956 46,418 31,373 9,951 8,123 27,830 95,956 272,607 Grade 3 9,530 2,634 2,494 1,473 1,517 398 4,724 22,770 Grade 4 26,681 989 836 2,361 150 266 377 31,660 Grade 5 — 51 — — — — 5 56 Total commercial and agricultural non-real estate 334,972 268,939 183,157 127,834 66,706 76,932 411,983 1,470,523 Consumer non-real estate Grade 1 97,332 134,078 62,491 23,064 8,531 3,601 6,040 335,137 Grade 2 5,823 8,919 5,049 1,440 822 451 268 22,772 Grade 3 207 866 574 303 127 114 15 2,206 Grade 4 17 224 211 53 49 70 1 625 Total consumer non-real estate 103,379 144,087 68,325 24,860 9,529 4,236 6,324 360,740 Other loans Grade 1 840,615 31,131 28,254 21,729 18,562 17,839 20,228 978,358 Grade 2 — — 17 3,011 1,174 2,136 794 7,132 Grade 3 — — 14 3 71 229 122 439 Grade 4 — — 26 62 28 120 1,085 1,321 Total other loans 840,615 31,131 28,311 24,805 19,835 20,324 22,229 987,250 Pegasus Bank Grade 1 55,924 73,386 41,076 29,680 15,297 42,601 91,378 349,342 Grade 2 17,057 34,856 7,213 22,767 4,652 8,014 38,964 133,523 Grade 3 — — — — — 1,339 — 1,339 Grade 4 — — — — 600 — — 600 Total Pegasus Bank 72,981 108,242 48,289 52,447 20,549 51,954 130,342 484,804 Total loans held for investment $2,076,792 $1,417,140 $764,257 $547,712 $384,205 $749,227 $735,621 $6,674,954 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. See Note (1) for additional information regarding the factors that influenced the Company’s current estimate of expected credit losses. 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 $38.9 million provision for credit losses for the first six months of 2020 utilizing the newly adopted CECL methodology, a significant increase from the first six months of 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 the first six months of 2020. Prolonged low energy prices will not only have a direct impact on the energy portfolio; it will have an indirect effect on the economies of Oklahoma and the Dallas, Texas market, including higher unemployment, with a residual effect on land values and real estate prices. The following table details activity in the allowance for credit losses on loans for the period presented. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. Allowance for Credit Losses Balance at beginning of period Impact of CECL adoption Initial allowance on loans purchased with credit deterioration Charge- offs Recoveries Net charge-offs Provision for credit losses on loans Balance at end of period (Dollars in thousands) Three Months Ended June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 4,544 $ — $ — $ (113 ) $ 1 $ (112 ) $ 2,198 $ 6,630 Commercial real estate non-owner occupied 5,935 — — — — — 3,548 9,483 Construction and development < 60 months 1,136 — — (56 ) 3 (53 ) 672 1,755 Construction residential real estate < 60 months 1,618 — — (28 ) — (28 ) 669 2,259 Residential real estate first lien 6,192 — — (66 ) 4 (62 ) 2,423 8,553 Residential real estate all other 2,292 — — (7 ) 1 (6 ) 434 2,720 Farmland 1,788 — — — — — 723 2,511 Commercial and agricultural non-real estate 37,276 — — (287 ) 66 (221 ) 7,450 44,505 Consumer non-real estate 3,385 — — (235 ) 57 (178 ) 1,507 4,714 Other loans 2,751 — — — — — (238 ) 2,513 Pegasus Bank 3,163 — — 330 417 747 (53 ) 3,857 Total $ 70,080 $ — $ — $ (462 ) $ 549 $ 87 $ 19,333 $ 89,500 Six Months Ended June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 5,625 $ (2,806 ) $ 432 $ (113 ) $ 1 $ (112 ) $ 3,491 $ 6,630 Commercial real estate non-owner occupied 8,358 (5,507 ) — — — — 6,632 9,483 Construction and development < 60 months 2,214 (1,056 ) — (59 ) 3 (56 ) 653 1,755 Construction residential real estate < 60 months 1,933 (778 ) — (29 ) — (29 ) 1,133 2,259 Residential real estate first lien 8,692 (3,831 ) 7 (218 ) 6 (212 ) 3,897 8,553 Residential real estate all other 2,767 (1,408 ) — (32 ) 28 (4 ) 1,365 2,720 Farmland 2,821 (1,408 ) 1 — — — 1,097 2,511 Commercial and agricultural non-real estate 15,345 11,849 62 (374 ) 83 (291 ) 17,540 44,505 Consumer non-real estate 3,252 (622 ) — (556 ) 114 (442 ) 2,526 4,714 Other loans 2,632 (116 ) — — 2 2 (5 ) 2,513 Pegasus Bank 599 2,488 — (241 ) 424 183 587 3,857 Total $ 54,238 $ (3,195 ) $ 502 $ (1,622 ) $ 661 $ (961 ) $ 38,916 $ 89,500 Allowance for Credit Losses Balance at beginning of period Charge- offs Recoveries Net charge-offs Provision for credit losses on loans Balance at end of period (Dollars in thousands) Three Months Ended June 30, 2019 BancFirst Real estate: Non-residential real estate owner occupied $ 6,655 $ (3 ) $ — $ (3 ) $ 235 $ 6,887 Non-residential real estate other 11,362 (16 ) 1 (15 ) (60 ) 11,287 Residential real estate permanent mortgage 3,261 (4 ) 4 — 64 3,325 Residential real estate all other 11,046 (143 ) 25 (118 ) 793 11,721 Non-consumer non-real estate 14,409 (87 ) 85 (2 ) 825 15,232 Consumer non-real estate 3,072 (162 ) 38 (124 ) 286 3,234 Other loans 2,408 — 43 43 (2 ) 2,449 Acquired loans 702 (170 ) 149 (21 ) 292 973 Total $ 52,915 $ (585 ) $ 345 $ (240 ) $ 2,433 $ 55,108 Six Months Ended June 30, 2019 BancFirst Real estate: Non-residential real estate owner occupied $ 6,328 $ (9 ) $ 1 $ (8 ) $ 567 $ 6,887 Non-residential real estate other 11,027 (22 ) 1 (21 ) 281 11,287 Residential real estate permanent mortgage 3,261 (67 ) 9 (58 ) 122 3,325 Residential real estate all other 10,673 (195 ) 27 (168 ) 1,216 11,721 Non-consumer non-real estate 13,151 (157 ) 152 (5 ) 2,086 15,232 Consumer non-real estate 3,065 (282 ) 109 (173 ) 342 3,234 Other loans 2,423 — 78 78 (52 ) 2,449 Acquired loans 1,461 (196 ) 153 (43 ) (445 ) 973 Total $ 51,389 $ (928 ) $ 530 $ (398 ) $ 4,117 $ 55,108 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 period ended June 30, 2020 Purchase price of loans at acquisition $ 1,586 Allowance for credit losses at acquisition 502 Par value of acquired loans at acquisition $ 2,088 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. The following table summarizes collateral-dependent gross loans held for investment by collateral type as follows: Collateral Type Real Estate Business Assets Energy Reserves Other Assets (Dollars in thousands) As of June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 2,386 $ — $ — $ — Commercial real estate non-owner occupied 341 — — — Construction and development < 60 months 15 — — — Construction residential real estate < 60 months — — — — Residential real estate first lien 1,491 — — — Residential real estate all other 657 — — — Farmland 984 — — — Commercial and agricultural non-real estate — 515 28,282 760 Consumer non-real estate — — — 127 Other loans — 23 — — Pegasus Bank 1,265 — — — Total collateral-dependent loans held for investment $ 7,139 $ 538 $ 28,282 $ 887 Non-Cash Transfers from Loans and Premises and Equipment Transfers from loans and premises and equipment to other real estate owned and repossessed assets are non-cash transactions, and are not included in the statements of cash flow. Transfers from loans and premises and equipment to other real estate owned and repossessed assets during the periods presented are summarized as follows: Six Months Ended June 30, 2020 2019 (Dollars in thousands) Other real estate owned $ 2,876 $ 2,010 Repossessed assets 722 627 Total $ 3,598 $ 2,637

Intangible Assets and Goodwill

Intangible Assets and Goodwill	6 Months Ended
	Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	( 5 ) INTANGIBLE ASSETS AND GOODWILL The following is a summary of intangible assets: Gross Carrying Amount Accumulated Amortization Net Carrying Amount (Dollars in thousands) As of June 30, 2020 Core deposit intangibles $ 35,562 $ (15,453 ) $ 20,109 Customer relationship intangibles 3,391 (2,618 ) 773 Total $ 38,953 $ (18,071 ) $ 20,882 As of December 31, 2019 Core deposit intangibles $ 35,856 $ (14,131 ) $ 21,725 Customer relationship intangibles 3,391 (2,508 ) 883 Total $ 39,247 $ (16,639 ) $ 22,608 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) Six months ended June 30, 2020 Balance at beginning of period $ 13,767 $ 59,894 $ 68,855 $ 5,464 $ 624 $ 148,604 Acquisitions — 1,318 — — — 1,318 Balance at beginning and 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. Additional information for intangible assets can be found in Note (7) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.

Leases

Leases	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	(6) 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. Rent expense for all operating leases, including those rented on a monthly or temporary basis totaled approximately $453,000 and $376,000 for the three months ended June 30, 2020 and June 30, 2019, respectively. Rent expense for all operating leases, including those rented on a monthly or temporary basis totaled approximately $916,000 and $767,000 for the six months ended June 30, 2020 and June 30, 2019, respectively. As of June 30, 2020, right of use lease asset included in accrued interest receivable and other assets on the balance sheet totaled $4.8 million, and a related lease liability included in accrued interest payable and other liabilities on the balance sheet totaled $4.6 million. There have been no significant changes in our expected future minimum lease payments since December 31, 2019. The future minimum lease payments are disclosed in Note (20) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. As of June 30, 2020, our operating leases have a weighted-average remaining lease term of 3.2 years and a weighted-average discount rate of 3.3 percent. Maturity of Operating Lease Liabilities June 30, 2020 (Dollars in thousands) 2020 (six months) $ 782 2021 1,240 2022 993 2023 562 2024 339 Thereafter 1,165 Total lease payments 5,081 Less imputed Interest (473 ) Operating lease liability $ 4,608 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 $1.4 million and $1.5 million for the three months ended June 30, 2020 and June 30, 2019, respectively. The Company had operating lease revenue of $2.8 million and $3.1 million for the six months ended June 30, 2020 and June 30, 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: June 30, 2020 (Dollars in thousands) 2020 (six months) $ 2,022 2021 3,394 2022 2,810 2023 2,324 2024 1,783 2025-2030 4,496 Total future minimum lease payments $ 16,829

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	( 7 ) STOCK-BASED COMPENSATION The Company has had a nonqualified incentive stock option plan (the “BancFirst ISOP”) since May 1986. At June 30, 2020, there were 330,000 shares available for future grants. The BancFirst ISOP 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 “BancFirst Directors’ Stock Option Plan”) since June 1999. Each non-employee director is granted an option for 10,000 shares. At June 30, 2020, there were 30,000 shares available for future grants. The BancFirst Directors’ Stock Option 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. The following table is a summary of the activity under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan: Wgtd. Avg. Wgtd. Avg. Remaining Aggregate Exercise Contractual Intrinsic Options Price Term Value (Dollars in thousands, except option data) Six Months Ended June 30, 2020 Outstanding at December 31, 2019 1,257,730 $ 32.70 Options granted 157,500 49.32 Options exercised (26,400 ) 19.07 Options canceled, forfeited, or expired (135,000 ) 51.56 Outstanding at June 30, 2020 1,253,830 33.04 8.93 Yrs $ 9,440 Exercisable at June 30, 2020 697,330 24.13 7.12 Yrs $ 11,461 The following table has additional information regarding options exercised under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Total intrinsic value of options exercised $ 337 $ 759 $ 726 $ 904 Cash received from options exercised 303 455 504 611 Tax benefit realized from options exercised 86 193 185 230 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: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Stock-based compensation expense $ 406 $ 367 $ 832 $ 541 Tax benefit 103 94 212 138 Stock-based compensation expense, net of tax $ 303 $ 273 $ 620 $ 403 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: June 30, 2020 (Dollars in thousands) Unearned stock-based compensation expense $ 4,128 The following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented: Six Months Ended June 30, 2020 2019 Weighted average grant-date fair value per share of options granted $ 10.63 $ 13.67 Risk-free interest rate 0.66 to 1.13% 2.62 to 2.76% Dividend yield 2.00% 2.00% Stock price volatility 22.84 to 33.56% 22.93 to 22.96% Expected term 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 “BancFirst Deferred Stock Compensation Plan”) since May 1999. As of June 30, 2020, there are 28,582 shares available for future issuance under the BancFirst Deferred Stock Compensation Plan. The BancFirst Deferred Stock Compensation Plan will terminate on December 31, 2024, if not extended. Under the plan, directors and members of the community advisory boards of the Company and its subsidiaries may defer up to 100% of their board fees. They are credited for each deferral with a number of stock units based on the current market price of the Company’s stock, which accumulate in an account until such time as the director or community board member terminates serving as a board member. Shares of common stock of the Company are then distributed to the terminating director or community board member based upon the number of stock units accumulated in his or her account. There were 1,307 and 8,362 shares of common stock distributed from the BancFirst Deferred Stock Compensation Plan during the six months ended June 30, 2020 and June 30, 2019, respectively. A summary of the accumulated stock units is as follows: June 30, December 31, 2020 2019 Accumulated stock units 148,550 143,362 Average price $ 27.85 $ 27.17

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Stockholders' Equity	( 8 ) STOCKHOLDERS’ EQUITY In November 1999, the Company adopted the SRP. The SRP may be used as a means to increase earnings per share and return on equity, to purchase treasury stock for the exercise of stock options or for distributions under the Deferred Stock Compensation Plan, to provide liquidity for optionees to dispose of stock from exercises of their stock options, and to provide liquidity for stockholders wishing to sell their stock. All shares repurchased under the SRP have been retired and not held as treasury stock. The timing, price and amount of stock repurchases under the SRP may be determined by management and approved by the Company’s Executive Committee. The following table is a summary of the shares under the program: Six Months Ended June 30, 2020 2019 Number of shares repurchased 59,284 — Average price of shares repurchased $ 52.26 $ — Shares remaining to be repurchased 62,782 148,736 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 Federal Deposit Insurance Corporation (“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 June 30, 2020, 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: Required To Be Well For Capital With Capitalized Under Adequacy Capital Conservation Prompt Corrective Actual Purposes Buffer Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) As of June 30, 2020: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 960,793 14.83% $ 518,290 8.00% $ 680,256 10.50% N/A N/A BancFirst 871,013 14.62% 476,462 8.00% 625,357 10.50% $ 595,578 10.00% Pegasus Bank 67,867 13.28% 40,893 8.00% 53,672 10.50% 51,116 10.00% Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 853,705 13.18% $ 291,538 4.50% $ 453,504 7.00% N/A N/A BancFirst 776,428 13.04% 268,010 4.50% 416,905 7.00% $ 387,126 6.50% Pegasus Bank 63,636 12.45% 23,002 4.50% 35,781 7.00% 33,226 6.50% Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 879,705 13.58% $ 388,718 6.00% $ 550,683 8.50% N/A N/A BancFirst 796,428 13.37% 357,347 6.00% 506,241 8.50% $ 476,462 8.00% Pegasus Bank 63,636 12.45% 30,670 6.00% 43,449 8.50% 40,893 8.00% Tier 1 Capital (to Total Assets)- BancFirst Corporation $ 879,705 9.45% $ 372,344 4.00% N/A N/A N/A N/A BancFirst 796,428 9.33% 341,272 4.00% N/A N/A $ 426,591 5.00% Pegasus Bank 63,636 8.34% 30,517 4.00% N/A N/A 38,146 5.00% As of June 30, 2020, 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. 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 the second quarter of 2020 are included in the calculation of the Company’s leverage ratio as of June 30, 2020 as the Company did not utilize the PPP Facility for funding purposes. As discussed in Note 1 - Significant Accounting Policies, 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 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	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Net Income Per Common Share	( 9 ) NET INCOME PER COMMON SHARE Basic and diluted net income per common share are calculated as follows: Income (Numerator) Shares (Denominator) Per Share Amount (Dollars in thousands, except per share data) Three Months Ended June 30, 2020 Basic Income available to common stockholders $ 20,730 32,651,262 $ 0.64 Dilutive effect of stock options — 424,231 Diluted Income available to common stockholders plus assumed exercises of stock options $ 20,730 33,075,493 $ 0.63 Three Months Ended June 30, 2019 Basic Income available to common stockholders $ 34,167 32,629,146 $ 1.04 Dilutive effect of stock options — 688,047 Diluted Income available to common stockholders plus assumed exercises of stock options $ 34,167 33,317,193 $ 1.02 Six Months Ended June 30, 2020 Basic Income available to common stockholders $ 43,338 32,665,425 $ 1.33 Dilutive effect of stock options — 531,966 Diluted Income available to common stockholders plus assumed exercises of stock options $ 43,338 33,197,391 $ 1.31 Six Months Ended June 30, 2019 Basic Income available to common stockholders $ 66,004 32,620,819 $ 2.02 Dilutive effect of stock options — 685,610 Diluted Income available to common stockholders plus assumed exercises of stock options $ 66,004 33,306,429 $ 1.98 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 period because the options were anti-dilutive for the period: Shares Three Months Ended June 30, 2020 448,016 Three Months Ended June 30, 2019 158,500 Six Months Ended June 30, 2020 424,939 Six Months Ended June 30, 2019 169,301

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	( 10 ) FAIR VALUE MEASUREMENTS Accounting standards define fair value as the price that would be received to sell an asset or the price paid to transfer a liability in the principal or most advantageous market available to the entity in an orderly transaction between market participants on the measurement date. FASB Accounting Standards Codification (“ASC”) Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: • Level 1 Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset and liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose values are determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. This category includes certain 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. Securities Available for Sale Securities classified as available for sale are reported at fair value. U.S. Treasuries are valued using Level 1 inputs. Other securities available for sale including U.S. federal agencies, registered mortgage backed 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 securities for which observable information is not readily available. These securities are reported at fair value utilizing Level 3 inputs. For these 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 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 securities. The Company reviews the prices for Level 1 and Level 2 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 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 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. The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of the periods presented, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Fair Value (Dollars in thousands) June 30, 2020 Securities available for sale: U.S. Treasury $ 512,861 $ — $ — $ 512,861 U.S. federal agencies — 21,181 — 21,181 Mortgage-backed securities — 16,582 — 16,582 States and political subdivisions — 41,048 590 41,638 Asset backed securities — — 12,714 12,714 December 31, 2019 Securities available for sale: U.S. Treasury $ 414,449 $ — $ — $ 414,449 U.S. federal agencies — 23,024 — 23,024 Mortgage-backed securities — 17,005 — 17,005 States and political subdivisions — 22,531 — 22,531 Asset backed securities — — 12,714 12,714 The changes in Level 3 assets measured at estimated fair value on a recurring basis during the periods presented were as follows: Six Months Ended June 30, Twelve Months Ended December 31, 2020 2019 (Dollars in thousands) Balance at the beginning of the year $ 12,714 $ 13,443 Transfers from level 2 1,644 — Settlements (1,047 ) (695 ) Total unrealized losses (7 ) (34 ) Balance at the end of the period $ 13,304 $ 12,714 The Company’s policy is to recognize transfers in and transfers out of Levels 1, 2 and 3 as of the end of the reporting period. During the six months ended June 30, 2020, the Company transferred 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. During the twelve months ended December 31, 2019, the Company did not transfer any securities between levels in the fair value hierarchy. 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. Beginning January 1, 2018, upon adoption of ASU 2016-01, 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 l oans 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 Level 3 (Dollars in thousands) As of and for the Year-to-date Period Ended June 30, 2020 Equity securities $ 9,373 Collateral dependent loans 21,440 Repossessed assets 264 Other real estate owned 2,215 As of and for the Year-to-date Period Ended December 31, 2019 Equity securities $ 10,121 Collateral dependent loans 45,687 Repossessed assets 465 Other real estate owned 3,024 Estimated Fair Value of Financial Instruments The Company is required under current authoritative accounting guidance to disclose the estimated fair value of their financial instruments that are not recorded at fair value. For the Company, as for most financial institutions, substantially all of its assets and liabilities are considered financial instruments. A financial instrument is defined as cash, evidence of an ownership interest in an entity or a contract that creates a contractual obligation or right to deliver or receive cash or another financial instrument from a second entity. The following methods and assumptions were used to estimate the fair value of each class of financial instruments: Cash and Cash Equivalents Include: Cash and Due from Banks and Interest-Bearing Deposits with Banks The carrying amount of these short-term instruments is based on a reasonable estimate of fair value. Federal Funds Sold The carrying amount of these short-term instruments is based on a reasonable estimate of fair value. Securities Held for Investment For 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. 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 including PPP 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. Long-Term Borrowings The fair values of fixed-rate long-term borrowings are estimated using rates that would be charged for borrowings of similar remaining maturities. Junior Subordinated Debentures The fair values of junior subordinated debentures are estimated using the rates that would be charged for junior subordinated debentures of similar remaining maturities. Loan Commitments and Letters of Credit The fair values of commitments are estimated using the fees currently charged to enter into similar agreements, taking into account the terms of the agreements. The fair values of letters of credit are based on fees currently charged for similar agreements. The estimated fair values of the Company’s financial instruments that are reported at amortized cost in the Company’s consolidated balance sheets, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows: June 30, December 31, 2020 2019 Carrying Amount Fair Value Carrying Amount Fair Value (Dollars in thousands) FINANCIAL ASSETS Level 2 inputs: Cash and cash equivalents $ 1,788,343 $ 1,788,343 $ 1,868,281 $ 1,868,281 Federal funds sold — — 1,000 1,000 Securities held for investment 75 78 1,403 1,403 Loans held for sale 21,902 21,902 11,001 11,001 Level 3 inputs: Securities held for investment 2,980 2,970 500 500 Loans, net of allowance for credit losses 6,585,454 6,643,225 5,607,905 5,625,005 FINANCIAL LIABILITIES Level 2 inputs: Deposits 8,486,671 8,503,240 7,483,635 7,497,429 Short-term borrowings 8,100 8,100 1,100 1,100 Long-term borrowings 3,000 2,989 — — Junior subordinated debentures 26,804 30,246 26,804 29,324 OFF-BALANCE SHEET FINANCIAL INSTRUMENTS Loan commitments 3,140 2,832 Letters of credit 476 485 Non-financial Assets and Non-financial Liabilities Measured at Fair Value The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Certain non-financial assets and non-financial liabilities measured at fair value on a nonrecurring basis include intangible assets and other non-financial long-lived assets measured at fair value and adjusted for impairment. These items are evaluated at least annually for impairment. The overall levels of non-financial assets and non-financial liabilities measured at fair value on a nonrecurring basis were not considered to be significant to the Company at June 30, 2020 or December 31, 2019.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Information	(11) SEGMENT INFORMATION The Company evaluates its performance with an internal profitability measurement system that measures the profitability of its business units on a pre-tax basis. The 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 four business units are as follows: Metropolitan Banks Community Banks Pegasus Bank Other Financial Services Executive, Operations & Support Eliminations Consolidated (Dollars in thousands) Three Months Ended June 30, 2020 Net interest income $ 22,310 $ 43,917 $ 4,976 $ 5,905 $ 100 $ — $ 77,208 Noninterest income 4,571 13,841 121 9,328 25,774 (21,553 ) 32,082 Income before taxes 3,613 15,532 1,345 7,786 18,232 (21,202 ) 25,306 Three Months Ended June 30, 2019 Net interest income $ 21,438 $ 44,775 $ — $ 1,411 $ 1,168 $ — $ 68,792 Noninterest income 4,635 16,243 — 10,105 37,917 (34,823 ) 34,077 Income before taxes 14,866 30,041 — 5,572 27,590 (34,241 ) 43,828 Six Months Ended June 30, 2020 Net interest income $ 44,494 $ 88,415 $ 10,584 $ 7,488 $ 300 $ — $ 151,281 Noninterest income 9,271 29,694 252 20,218 53,257 (45,465 ) 67,227 Income before taxes 14,026 39,968 2,943 13,545 27,635 (44,561 ) 53,556 Six Months Ended June 30, 2019 Net interest income $ 42,791 $ 88,182 $ — $ 2,582 $ 2,140 $ — $ 135,695 Noninterest income 8,844 31,128 — 19,978 73,438 (67,310 ) 66,078 Income before taxes 30,235 58,086 — 10,071 52,613 (66,163 ) 84,842 Total Assets: June 30, 2020 $ 3,035,989 $ 5,703,770 $ 774,939 $ 938,034 $ 248,390 $ (1,088,669 ) $ 9,612,453 December 31, 2019 2,806,021 4,998,247 738,351 102,442 950,920 (1,030,223 ) 8,565,758 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.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements include the accounts of BancFirst Corporation, Council Oak Partners, LLC, BancFirst Insurance Services, Inc., BancFirst Risk & Insurance Company, 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 and BancFirst Agency, Inc. All significant intercompany accounts and transactions have been eliminated. Assets held in a fiduciary or agency capacity are not assets of the Company and, accordingly, are not included in the unaudited interim consolidated financial statements. The accompanying unaudited interim consolidated financial statements and notes are presented in accordance with U.S. GAAP for interim financial information and the instructions for Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). The information contained in the financial statements and footnotes included in BancFirst Corporation’s Annual Report on Form 10-K for the year ended December 31, 2019, should be referred to in connection with these unaudited interim consolidated financial statements. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. The unaudited interim consolidated financial statements contained herein reflect all adjustments which are, in the opinion of management, necessary to provide a fair statement of the financial position and results of operations of the Company for the interim periods presented. All such adjustments are of a normal and recurring nature.
Reclassifications	Reclassifications Certain items in prior financial statements have been reclassified to conform to the current presentation. Such reclassifications had no effect on previously reported cash flows, stockholders’ equity or comprehensive income.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States inherently involves the use of estimates and assumptions that affect the amounts reported in the financial statements and the related disclosures. These estimates relate principally to the determination of the allowance for credit losses, income taxes, the fair value of financial instruments and the valuation of intangibles. Such estimates and assumptions may change over time and actual amounts realized may differ from those reported.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Standards Adopted During Current Period: In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018-13, “Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement (Topic 820).” ASU 2018-13 modifies disclosure requirements on fair value measurements in Topic 820. ASU 2018-13 was effective for the Company on January 1, 2020. ASU No. 2018-13 was adopted on January 1, 2020 and did not have a significant impact on the Company’s financial statements. On January 1, 2020, the Company adopted ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” Accounting Standards Codification (“ASC”) 326 replaces the incurred loss methodology with an expected loss methodology that is referred to as the current expected credit loss (“CECL”) methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor in accordance with Topic 842 on leases. In addition, ASC 326 made changes to the accounting for purchased loans and securities with credit deterioration and available-for-sale debt securities. The Company adopted ASC 326 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Operating results for periods from January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards and the accounting policies described in our 2019 Form 10-K. The Company recorded a net increase to retained earnings of $2.3 million, net of tax of $925,000, as of January 1, 2020 for the cumulative effect of adopting ASC 326, and the impact on our results of operations and cash flows was not material. The Company adopted ASC 326 using the prospective transition approach for financial assets purchased with credit deterioration (PCD) that were previously classified as purchased credit impaired (PCI) and accounted for under ASC 310-30. In accordance with the standard, management did not reassess whether PCI assets met the criteria of PCD assets as of the date of adoption. On January 1, 2020, the amortized cost basis of the PCD assets was adjusted to reflect the addition of approximately $1.2 million to the allowance for credit losses. The Company has not recorded an allowance for credit losses against its available-for-sale securities, as the credit risk is not material. The following table illustrates the impact of ASC 326 on the allowance for credit losses on the Company’s loans as of January 1, 2020. January 1, 2020 As Reported Under ASC 326 Pre ASC 326 Adoption Impact of ASC 326 Adoption (Dollars in thousands) BancFirst Real estate: Commercial real estate owner occupied $ 2,819 $ 5,625 $ (2,806 ) Commercial real estate non-owner occupied 2,851 8,358 (5,507 ) Construction and development < 60 months 1,158 2,214 (1,056 ) Construction residential real estate < 60 months 1,155 1,933 (778 ) Residential real estate first lien 4,861 8,692 (3,831 ) Residential real estate all other 1,359 2,767 (1,408 ) Farmland 1,413 2,821 (1,408 ) Commercial and agricultural non-real estate 27,194 15,345 11,849 Consumer non-real estate 2,630 3,252 (622 ) Other loans 2,516 2,632 (116 ) Pegasus Bank 3,087 599 2,488 Allowance for credit losses on loans $ 51,043 $ 54,238 $ (3,195 ) The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. In order to estimate expected losses using historical loss information, the Company elected to utilize a methodology known as vintage loss analysis for substantially all of our loan portfolio. Vintage loss analysis measures impairment based on the age of the accounts and the historical asset performance of assets with similar risk characteristics. Vintage loss analysis accounts for expected losses by allowing the Company to calculate the cumulative loss rates of a given loan pool and in so doing, determine the loan pool’s lifetime expected loss experience. This includes a reasonable approximation of probable and estimable future losses determined by applying historical net charge off information to forward looking qualitative and environmental factors. First, the Company determined the appropriate type of financial assets that share similar risk characteristics, and then the Company developed a cumulative loss curve for the applicable financial assets based on historical data using different “vintages” analyzed by year of origination. This is done by dividing each year’s net charge-offs by the original principal balance. The respective vintage’s original principal balance remains the denominator in each annual calculation, as it references the specific vintage’s original balance. The loss experience of this original balance is tracked annually and summed over the life of the loan for each separate loan pool leaving a cumulative, life of credit loss rate based on historic averages weighted towards more recent loss experience. In addition to life of credit loss data, primary drivers like macroeconomic indicators of qualitative factors are used as adjustments to the expected loss calculation to reach a forecast supported by both quantitative and qualitative data points. The intent is to express the impact of changes in external factors while incorporating analysis of where the loan pool is in its loss history. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not included in the collective evaluation. The Company has made the accounting policy election to use the fair value of the collateral to measure expected credit losses on collateral-dependent financial assets. 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 connection with the adoption of ASC 326, the Company revised certain accounting policies and implemented accounting policy elections. The revised accounting policies are described below. Loans The Company has made the accounting policy election to exclude accrued interest receivable on loans from the estimate of credit losses. 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. Purchased Credit Deteriorated (PCD) Loans Allowance for Credit Losses - Loans 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 under CECL. The Company has identified the following portfolio segments, which includes the applicable weighted average life, and measures the allowance for credit losses using the vintage loss analysis adjusted for qualitative factors: Loan Segment Life (in years) BancFirst 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 6 Farmland 12 Commercial and agricultural non-real estate 3 Consumer non-real estate 4 Other loans 9 Pegasus Bank 4 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, oil and gas, 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. Other loans. Other loans consist of loans approved by the Small Business A dministratio n (SBA), which include loans funded through the Paycheck Protection Program (PPP) . Since PPP loans are fully guaranteed by the SBA, there is no expected credit loss related to these loans. Pegasus Bank. Pegasus Bank’s loans are commercial and consumer loans mostly to customers within Texas secured by real estate. Pegasus Bank also includes commercial and industrial loans, which includes loans to companies in the oil and gas industry. 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 oil and gas prices, national and local unemployment, real gross domestic product (“GDP”), house price index (“HPI”), consumer price index (“CPI”), rental vacancies, and retail sales. 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. Determining the Contractual Term: Troubled Debt Restructurings (TDRs Allowance for Credit Losses on Off-Balance Sheet Credit Exposures Allowance for Credit Losses - Available-for-Sale Securities PPP Fee Income Policy:

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies (Tables) - ASC 326 [Member]	6 Months Ended
	Jun. 30, 2020
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Schedule of Impact of ASC 326 Adoption on Allowance for Credit losses on Loans	The Company has not recorded an allowance for credit losses against its available-for-sale securities, as the credit risk is not material. The following table illustrates the impact of ASC 326 on the allowance for credit losses on the Company’s loans as of January 1, 2020. January 1, 2020 As Reported Under ASC 326 Pre ASC 326 Adoption Impact of ASC 326 Adoption (Dollars in thousands) BancFirst Real estate: Commercial real estate owner occupied $ 2,819 $ 5,625 $ (2,806 ) Commercial real estate non-owner occupied 2,851 8,358 (5,507 ) Construction and development < 60 months 1,158 2,214 (1,056 ) Construction residential real estate < 60 months 1,155 1,933 (778 ) Residential real estate first lien 4,861 8,692 (3,831 ) Residential real estate all other 1,359 2,767 (1,408 ) Farmland 1,413 2,821 (1,408 ) Commercial and agricultural non-real estate 27,194 15,345 11,849 Consumer non-real estate 2,630 3,252 (622 ) Other loans 2,516 2,632 (116 ) Pegasus Bank 3,087 599 2,488 Allowance for credit losses on loans $ 51,043 $ 54,238 $ (3,195 )
Schedule of Portfolio Segments Weighted Average Life, and Measures the Allowance for Credit Losses	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 under CECL. The Company has identified the following portfolio segments, which includes the applicable weighted average life, and measures the allowance for credit losses using the vintage loss analysis adjusted for qualitative factors: Loan Segment Life (in years) BancFirst 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 6 Farmland 12 Commercial and agricultural non-real estate 3 Consumer non-real estate 4 Other loans 9 Pegasus Bank 4

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment	The following table summarizes the amortized cost and estimated fair values of debt securities held for investment: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value June 30, 2020 (Dollars in thousands) Mortgage backed securities (1) $ 75 $ 4 $ — $ 79 States and political subdivisions 2,480 3 (14 ) 2,469 Other securities 500 — — 500 Total $ 3,055 $ 7 $ (14 ) $ 3,048 December 31, 2019 Mortgage backed securities (1) $ 93 $ 4 $ — $ 97 States and political subdivisions 1,310 1 (5 ) 1,306 Other securities 500 — — 500 Total $ 1,903 $ 5 $ (5 ) $ 1,903
Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale	The following table summarizes the amortized cost and estimated fair values of debt securities available for sale: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value June 30, 2020 (Dollars in thousands) U.S. treasuries $ 500,161 $ 12,700 $ — $ 512,861 U.S. federal agencies 21,242 5 (66 ) 21,181 Mortgage backed securities (1) 16,127 455 — 16,582 States and political subdivisions 41,150 497 (9 ) 41,638 Asset backed securities 13,328 — (614 ) 12,714 Total $ 592,008 $ 13,657 $ (689 ) $ 604,976 December 31, 2019 U.S. treasuries $ 409,488 $ 4,974 $ (13 ) $ 414,449 U.S. federal agencies 23,039 23 (38 ) 23,024 Mortgage backed securities (1) 16,941 128 (64 ) 17,005 States and political subdivisions 22,294 282 (45 ) 22,531 Asset backed securities 13,320 — (606 ) 12,714 Total $ 485,082 $ 5,407 $ (766 ) $ 489,723 (1) Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.
Maturity of Debt Securities	The maturities of debt securities held for investment and available for sale are summarized in the following table using contractual maturities. Actual maturities may differ from contractual maturities due to obligations that are called or prepaid. For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been presented at their contractual maturity. June 30, 2020 December 31, 2019 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value (Dollars in thousands) Held for Investment Contractual maturity of debt securities: Within one year $ 880 $ 879 $ 300 $ 300 After one year but within five years 1,581 1,574 1,058 1,055 After five years but within ten years 593 594 543 546 After ten years 1 1 2 2 Total $ 3,055 $ 3,048 $ 1,903 $ 1,903 Available for Sale Contractual maturity of debt securities: Within one year $ 314,154 $ 315,140 $ 186,373 $ 186,539 After one year but within five years 234,514 246,662 252,519 257,430 After five years but within ten years 4,918 5,074 5,873 6,008 After ten years 38,422 38,100 40,317 39,746 Total debt securities $ 592,008 $ 604,976 $ 485,082 $ 489,723
Company's Book Value of Pledged Debt Securities	The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law: June 30, 2020 December 31, 2019 (Dollars Book value of pledged securities $ 423,779 $ 445,702

Loans Held for Investment and_2

Loans Held for Investment and Allowance for Credit Losses on Loans (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Summary of Loans Held for Investment by Portfolio Segment	Loans held for investment are summarized by portfolio segment as follows: June 30, 2020 December 31, 2019 Amount Amount (Dollars in thousands) BancFirst Real estate: Commercial real estate owner occupied $ 651,416 $ 621,188 Commercial real estate non-owner occupied 990,180 851,200 Construction and development < 60 months 225,598 287,138 Construction residential real estate < 60 months 206,504 189,480 Residential real estate first lien 860,964 834,849 Residential real estate all other 180,839 187,647 Farmland 256,136 246,988 Commercial and agricultural non-real estate 1,470,523 1,499,404 Consumer non-real estate 360,740 359,529 Other loans (2) 987,250 154,015 Pegasus Bank 484,804 430,705 Total (1) $ 6,674,954 $ 5,662,143 (1) Excludes accrued interest receivable of $31.0 million at June 30, 2020 and $27.4 million at December 31, 2019, that is recorded in accrued interest receivable and other assets. (2) Includes PPP loans of $825.1 million, net of unamortized processing fees of $26.2 million, at June 30, 2020.
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: June 30, December 31, 2020 2019 (Dollars in thousands) Troubled debt restructurings $ 3,213 $ 18,010 Other real estate owned and repossessed assets $ 4,948 $ 6,073
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. Residential real estate refers to one-to-four family real estate. June 30, 2020 (Dollars in thousands) BancFirst Real estate: Commercial real estate owner occupied $ 2,094 Commercial real estate non-owner occupied 463 Construction and development < 60 months 119 Construction residential real estate < 60 months — Residential real estate first lien 3,904 Residential real estate all other 792 Farmland 3,118 Commercial and agricultural non-real estate 32,299 Consumer non-real estate 247 Other loans 5,841 Pegasus Bank 600 Total $ 49,477 December 31, 2019 (Dollars in thousands) BancFirst Real estate: Non-residential real estate owner occupied $ 2,275 Non-residential real estate other 1,815 Residential real estate permanent mortgage 1,206 Residential real estate all other 3,060 Non-consumer non-real estate 2,915 Consumer non-real estate 264 Other loans 1,083 Acquired loans 4,496 Pegasus Bank 851 Total $ 17,965
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 Days Past Due 60-89 Days Past Due 90 Days and Greater Total Past Due Loans Current Loans Total Loans Accruing Loans 90 Days or More Past Due (Dollars in thousands) As of June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 415 $ 55 $ 2,037 $ 2,507 $ 648,909 $ 651,416 $ 77 Commercial real estate non-owner occupied 50 112 188 350 989,830 990,180 — Construction and development < 60 months 952 — — 952 224,646 225,598 — Construction residential real estate < 60 months 396 — — 396 206,108 206,504 — Residential real estate first lien 3,587 1,316 4,575 9,478 851,486 860,964 1,945 Residential real estate all other 449 171 766 1,386 179,453 180,839 63 Farmland 1,649 888 3,257 5,794 250,342 256,136 763 Commercial and agricultural non-real estate 19,056 4,766 4,841 28,663 1,441,860 1,470,523 2,154 Consumer non-real estate 1,712 595 465 2,772 357,968 360,740 313 Other loans 219 162 5,621 6,002 981,248 987,250 67 Pegasus Bank — — 600 600 484,204 484,804 — Total $ 28,485 $ 8,065 $ 22,350 $ 58,900 $ 6,616,054 $ 6,674,954 $ 5,382 As of December 31, 2019 BancFirst Real estate: Non-residential real estate owner occupied $ 1,600 $ 967 $ 5,159 $ 7,726 $ 699,690 $ 707,416 $ 3,799 Non-residential real estate other 971 — 1,228 2,199 1,134,976 1,137,175 — Residential real estate permanent mortgage 4,705 973 2,215 7,893 332,679 340,572 1,660 Residential real estate other 4,496 1,028 2,541 8,065 912,767 920,832 549 Non-consumer non-real estate 2,290 1,446 1,763 5,499 1,448,894 1,454,393 354 Consumer other 2,829 858 592 4,279 358,075 362,354 491 Other loans 1,670 8 4,613 6,291 147,724 154,015 4,426 Acquired loans 2,167 1,376 3,447 6,990 147,691 154,681 555 Pegasus Bank — — 851 851 429,854 430,705 — Total $ 20,728 $ 6,656 $ 22,409 $ 49,793 $ 5,612,350 $ 5,662,143 $ 11,834
Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades	The following table summarizes our gross loans held for investment by year of origination and internally assigned credit grades: Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total (Dollars in thousands) As of June 30, 2020 BancFirst Commercial real estate owner occupied Grade 1 $93,204 $115,392 $88,126 $56,119 $43,573 $117,406 $9,505 $523,325 Grade 2 16,310 31,307 12,723 10,742 13,926 29,741 3,324 118,073 Grade 3 142 107 599 1,583 495 1,380 2,742 7,048 Grade 4 47 78 879 — 392 1,107 467 2,970 Total commercial real estate owner occupied loans 109,703 146,884 102,327 68,444 58,386 149,634 16,038 651,416 Commercial real estate non-owner occupied Grade 1 188,253 178,055 105,465 90,957 91,046 107,176 13,590 774,542 Grade 2 25,466 68,282 18,066 23,070 11,432 52,193 3,712 202,221 Grade 3 1,126 3,929 7,118 543 42 155 70 12,983 Grade 4 — 94 191 — — 149 — 434 Total commercial real estate non-owner occupied loans 214,845 250,360 130,840 114,570 102,520 159,673 17,372 990,180 Construction and development < 60 months Grade 1 66,608 76,743 28,386 5,535 2,880 4,081 14,229 198,462 Grade 2 12,612 8,249 1,698 853 166 568 442 24,588 Grade 3 34 2,211 184 — — — — 2,429 Grade 4 — 70 10 24 — — — 104 Grade 5 15 — — — — — — 15 Total construction and development < 60 months 79,269 87,273 30,278 6,412 3,046 4,649 14,671 225,598 Construction residential real estate < 60 months Grade 1 94,678 72,479 69 22 37 32 4,727 172,044 Grade 2 18,660 11,920 114 — — 481 32 31,207 Grade 3 1,416 1,440 397 — — — — 3,253 Total construction residential real estate < 60 months 114,754 85,839 580 22 37 513 4,759 206,504 Residential real estate first lien Grade 1 135,181 176,422 94,426 76,299 56,326 169,576 — 708,230 Grade 2 16,067 26,417 23,633 12,417 13,232 37,470 — 129,236 Grade 3 3,796 2,195 1,597 1,737 2,340 6,592 — 18,257 Grade 4 88 815 858 301 1,105 2,023 — 5,190 Grade 5 — — — — 51 — — 51 Total residential real estate first lien 155,132 205,849 120,514 90,754 73,054 215,661 — 860,964 Residential real estate all other Grade 1 13,054 17,126 13,224 9,660 6,747 13,647 32,726 106,184 Grade 2 2,064 2,381 1,545 1,997 415 2,999 59,063 70,464 Grade 3 180 890 996 161 226 386 311 3,150 Grade 4 52 — 74 51 34 720 40 971 Grade 5 — 70 — — — — — 70 Total residential real estate all other 15,350 20,467 15,839 11,869 7,422 17,752 92,140 180,839 Farmland Grade 1 27,303 32,686 22,385 16,365 15,894 35,182 7,696 157,511 Grade 2 7,741 34,758 7,341 7,582 6,262 10,985 8,486 83,155 Grade 3 748 625 5,313 1,109 584 1,353 3,320 13,052 Grade 4 — — 758 639 381 379 261 2,418 Total farmland 35,792 68,069 35,797 25,695 23,121 47,899 19,763 256,136 Commercial and agricultural non-real estate Grade 1 245,805 218,847 148,454 114,049 56,916 48,438 310,921 1,143,430 Grade 2 52,956 46,418 31,373 9,951 8,123 27,830 95,956 272,607 Grade 3 9,530 2,634 2,494 1,473 1,517 398 4,724 22,770 Grade 4 26,681 989 836 2,361 150 266 377 31,660 Grade 5 — 51 — — — — 5 56 Total commercial and agricultural non-real estate 334,972 268,939 183,157 127,834 66,706 76,932 411,983 1,470,523 Consumer non-real estate Grade 1 97,332 134,078 62,491 23,064 8,531 3,601 6,040 335,137 Grade 2 5,823 8,919 5,049 1,440 822 451 268 22,772 Grade 3 207 866 574 303 127 114 15 2,206 Grade 4 17 224 211 53 49 70 1 625 Total consumer non-real estate 103,379 144,087 68,325 24,860 9,529 4,236 6,324 360,740 Other loans Grade 1 840,615 31,131 28,254 21,729 18,562 17,839 20,228 978,358 Grade 2 — — 17 3,011 1,174 2,136 794 7,132 Grade 3 — — 14 3 71 229 122 439 Grade 4 — — 26 62 28 120 1,085 1,321 Total other loans 840,615 31,131 28,311 24,805 19,835 20,324 22,229 987,250 Pegasus Bank Grade 1 55,924 73,386 41,076 29,680 15,297 42,601 91,378 349,342 Grade 2 17,057 34,856 7,213 22,767 4,652 8,014 38,964 133,523 Grade 3 — — — — — 1,339 — 1,339 Grade 4 — — — — 600 — — 600 Total Pegasus Bank 72,981 108,242 48,289 52,447 20,549 51,954 130,342 484,804 Total loans held for investment $2,076,792 $1,417,140 $764,257 $547,712 $384,205 $749,227 $735,621 $6,674,954
Activity in Allowance for Credit Losses on Loans	The following table details activity in the allowance for credit losses on loans for the period presented. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. Allowance for Credit Losses Balance at beginning of period Impact of CECL adoption Initial allowance on loans purchased with credit deterioration Charge- offs Recoveries Net charge-offs Provision for credit losses on loans Balance at end of period (Dollars in thousands) Three Months Ended June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 4,544 $ — $ — $ (113 ) $ 1 $ (112 ) $ 2,198 $ 6,630 Commercial real estate non-owner occupied 5,935 — — — — — 3,548 9,483 Construction and development < 60 months 1,136 — — (56 ) 3 (53 ) 672 1,755 Construction residential real estate < 60 months 1,618 — — (28 ) — (28 ) 669 2,259 Residential real estate first lien 6,192 — — (66 ) 4 (62 ) 2,423 8,553 Residential real estate all other 2,292 — — (7 ) 1 (6 ) 434 2,720 Farmland 1,788 — — — — — 723 2,511 Commercial and agricultural non-real estate 37,276 — — (287 ) 66 (221 ) 7,450 44,505 Consumer non-real estate 3,385 — — (235 ) 57 (178 ) 1,507 4,714 Other loans 2,751 — — — — — (238 ) 2,513 Pegasus Bank 3,163 — — 330 417 747 (53 ) 3,857 Total $ 70,080 $ — $ — $ (462 ) $ 549 $ 87 $ 19,333 $ 89,500 Six Months Ended June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 5,625 $ (2,806 ) $ 432 $ (113 ) $ 1 $ (112 ) $ 3,491 $ 6,630 Commercial real estate non-owner occupied 8,358 (5,507 ) — — — — 6,632 9,483 Construction and development < 60 months 2,214 (1,056 ) — (59 ) 3 (56 ) 653 1,755 Construction residential real estate < 60 months 1,933 (778 ) — (29 ) — (29 ) 1,133 2,259 Residential real estate first lien 8,692 (3,831 ) 7 (218 ) 6 (212 ) 3,897 8,553 Residential real estate all other 2,767 (1,408 ) — (32 ) 28 (4 ) 1,365 2,720 Farmland 2,821 (1,408 ) 1 — — — 1,097 2,511 Commercial and agricultural non-real estate 15,345 11,849 62 (374 ) 83 (291 ) 17,540 44,505 Consumer non-real estate 3,252 (622 ) — (556 ) 114 (442 ) 2,526 4,714 Other loans 2,632 (116 ) — — 2 2 (5 ) 2,513 Pegasus Bank 599 2,488 — (241 ) 424 183 587 3,857 Total $ 54,238 $ (3,195 ) $ 502 $ (1,622 ) $ 661 $ (961 ) $ 38,916 $ 89,500 Allowance for Credit Losses Balance at beginning of period Charge- offs Recoveries Net charge-offs Provision for credit losses on loans Balance at end of period (Dollars in thousands) Three Months Ended June 30, 2019 BancFirst Real estate: Non-residential real estate owner occupied $ 6,655 $ (3 ) $ — $ (3 ) $ 235 $ 6,887 Non-residential real estate other 11,362 (16 ) 1 (15 ) (60 ) 11,287 Residential real estate permanent mortgage 3,261 (4 ) 4 — 64 3,325 Residential real estate all other 11,046 (143 ) 25 (118 ) 793 11,721 Non-consumer non-real estate 14,409 (87 ) 85 (2 ) 825 15,232 Consumer non-real estate 3,072 (162 ) 38 (124 ) 286 3,234 Other loans 2,408 — 43 43 (2 ) 2,449 Acquired loans 702 (170 ) 149 (21 ) 292 973 Total $ 52,915 $ (585 ) $ 345 $ (240 ) $ 2,433 $ 55,108 Six Months Ended June 30, 2019 BancFirst Real estate: Non-residential real estate owner occupied $ 6,328 $ (9 ) $ 1 $ (8 ) $ 567 $ 6,887 Non-residential real estate other 11,027 (22 ) 1 (21 ) 281 11,287 Residential real estate permanent mortgage 3,261 (67 ) 9 (58 ) 122 3,325 Residential real estate all other 10,673 (195 ) 27 (168 ) 1,216 11,721 Non-consumer non-real estate 13,151 (157 ) 152 (5 ) 2,086 15,232 Consumer non-real estate 3,065 (282 ) 109 (173 ) 342 3,234 Other loans 2,423 — 78 78 (52 ) 2,449 Acquired loans 1,461 (196 ) 153 (43 ) (445 ) 973 Total $ 51,389 $ (928 ) $ 530 $ (398 ) $ 4,117 $ 55,108
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 period ended June 30, 2020 Purchase price of loans at acquisition $ 1,586 Allowance for credit losses at acquisition 502 Par value of acquired loans at acquisition $ 2,088
Collateral-Dependent Gross Loans Held for Investment by Collateral Type	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. The following table summarizes collateral-dependent gross loans held for investment by collateral type as follows: Collateral Type Real Estate Business Assets Energy Reserves Other Assets (Dollars in thousands) As of June 30, 2020 BancFirst Real estate: Commercial real estate owner occupied $ 2,386 $ — $ — $ — Commercial real estate non-owner occupied 341 — — — Construction and development < 60 months 15 — — — Construction residential real estate < 60 months — — — — Residential real estate first lien 1,491 — — — Residential real estate all other 657 — — — Farmland 984 — — — Commercial and agricultural non-real estate — 515 28,282 760 Consumer non-real estate — — — 127 Other loans — 23 — — Pegasus Bank 1,265 — — — Total collateral-dependent loans held for investment $ 7,139 $ 538 $ 28,282 $ 887
Transfers from Loans and Premises and Equipment to Other Real Estate Owned and Repossessed Assets	Transfers from loans and premises and equipment to other real estate owned and repossessed assets during the periods presented are summarized as follows: Six Months Ended June 30, 2020 2019 (Dollars in thousands) Other real estate owned $ 2,876 $ 2,010 Repossessed assets 722 627 Total $ 3,598 $ 2,637

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following is a summary of intangible assets: Gross Carrying Amount Accumulated Amortization Net Carrying Amount (Dollars in thousands) As of June 30, 2020 Core deposit intangibles $ 35,562 $ (15,453 ) $ 20,109 Customer relationship intangibles 3,391 (2,618 ) 773 Total $ 38,953 $ (18,071 ) $ 20,882 As of December 31, 2019 Core deposit intangibles $ 35,856 $ (14,131 ) $ 21,725 Customer relationship intangibles 3,391 (2,508 ) 883 Total $ 39,247 $ (16,639 ) $ 22,608
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) Six months ended June 30, 2020 Balance at beginning of period $ 13,767 $ 59,894 $ 68,855 $ 5,464 $ 624 $ 148,604 Acquisitions — 1,318 — — — 1,318 Balance at beginning and end of period $ 13,767 $ 61,212 $ 68,855 $ 5,464 $ 624 $ 149,922

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Schedule of Maturity of Operating Lease Liabilities	Maturity of Operating Lease Liabilities June 30, 2020 (Dollars in thousands) 2020 (six months) $ 782 2021 1,240 2022 993 2023 562 2024 339 Thereafter 1,165 Total lease payments 5,081 Less imputed Interest (473 ) Operating lease liability $ 4,608
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: June 30, 2020 (Dollars in thousands) 2020 (six months) $ 2,022 2021 3,394 2022 2,810 2023 2,324 2024 1,783 2025-2030 4,496 Total future minimum lease payments $ 16,829

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Activity Under Stock Option Plan	The following table is a summary of the activity under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan: Wgtd. Avg. Wgtd. Avg. Remaining Aggregate Exercise Contractual Intrinsic Options Price Term Value (Dollars in thousands, except option data) Six Months Ended June 30, 2020 Outstanding at December 31, 2019 1,257,730 $ 32.70 Options granted 157,500 49.32 Options exercised (26,400 ) 19.07 Options canceled, forfeited, or expired (135,000 ) 51.56 Outstanding at June 30, 2020 1,253,830 33.04 8.93 Yrs $ 9,440 Exercisable at June 30, 2020 697,330 24.13 7.12 Yrs $ 11,461
Options Exercised Under Stock Option Plan	The following table has additional information regarding options exercised under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Total intrinsic value of options exercised $ 337 $ 759 $ 726 $ 904 Cash received from options exercised 303 455 504 611 Tax benefit realized from options exercised 86 193 185 230
Stock-based Employee Compensation Expense	The following table is a summary of the Company’s recorded stock-based compensation expense: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Stock-based compensation expense $ 406 $ 367 $ 832 $ 541 Tax benefit 103 94 212 138 Stock-based compensation expense, net of tax $ 303 $ 273 $ 620 $ 403
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: June 30, 2020 (Dollars in thousands) Unearned stock-based compensation expense $ 4,128
Assumptions Used for Computing Stock-Based Compensation Expense	The following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented: Six Months Ended June 30, 2020 2019 Weighted average grant-date fair value per share of options granted $ 10.63 $ 13.67 Risk-free interest rate 0.66 to 1.13% 2.62 to 2.76% Dividend yield 2.00% 2.00% Stock price volatility 22.84 to 33.56% 22.93 to 22.96% Expected term 10 Yrs 10 Yrs
Summary of Accumulated Stock Units	A summary of the accumulated stock units is as follows: June 30, December 31, 2020 2019 Accumulated stock units 148,550 143,362 Average price $ 27.85 $ 27.17

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Summary of Shares Repurchased Under Stock Purchase Program	The following table is a summary of the shares under the program: Six Months Ended June 30, 2020 2019 Number of shares repurchased 59,284 — Average price of shares repurchased $ 52.26 $ — Shares remaining to be repurchased 62,782 148,736
Required Capital Amounts and Company's Respective Ratios	The actual and required capital amounts and ratios are shown in the following table: Required To Be Well For Capital With Capitalized Under Adequacy Capital Conservation Prompt Corrective Actual Purposes Buffer Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) As of June 30, 2020: Total Capital (to Risk Weighted Assets)- BancFirst Corporation $ 960,793 14.83% $ 518,290 8.00% $ 680,256 10.50% N/A N/A BancFirst 871,013 14.62% 476,462 8.00% 625,357 10.50% $ 595,578 10.00% Pegasus Bank 67,867 13.28% 40,893 8.00% 53,672 10.50% 51,116 10.00% Common Equity Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 853,705 13.18% $ 291,538 4.50% $ 453,504 7.00% N/A N/A BancFirst 776,428 13.04% 268,010 4.50% 416,905 7.00% $ 387,126 6.50% Pegasus Bank 63,636 12.45% 23,002 4.50% 35,781 7.00% 33,226 6.50% Tier 1 Capital (to Risk Weighted Assets)- BancFirst Corporation $ 879,705 13.58% $ 388,718 6.00% $ 550,683 8.50% N/A N/A BancFirst 796,428 13.37% 357,347 6.00% 506,241 8.50% $ 476,462 8.00% Pegasus Bank 63,636 12.45% 30,670 6.00% 43,449 8.50% 40,893 8.00% Tier 1 Capital (to Total Assets)- BancFirst Corporation $ 879,705 9.45% $ 372,344 4.00% N/A N/A N/A N/A BancFirst 796,428 9.33% 341,272 4.00% N/A N/A $ 426,591 5.00% Pegasus Bank 63,636 8.34% 30,517 4.00% N/A N/A 38,146 5.00%

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2020
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 (Numerator) Shares (Denominator) Per Share Amount (Dollars in thousands, except per share data) Three Months Ended June 30, 2020 Basic Income available to common stockholders $ 20,730 32,651,262 $ 0.64 Dilutive effect of stock options — 424,231 Diluted Income available to common stockholders plus assumed exercises of stock options $ 20,730 33,075,493 $ 0.63 Three Months Ended June 30, 2019 Basic Income available to common stockholders $ 34,167 32,629,146 $ 1.04 Dilutive effect of stock options — 688,047 Diluted Income available to common stockholders plus assumed exercises of stock options $ 34,167 33,317,193 $ 1.02 Six Months Ended June 30, 2020 Basic Income available to common stockholders $ 43,338 32,665,425 $ 1.33 Dilutive effect of stock options — 531,966 Diluted Income available to common stockholders plus assumed exercises of stock options $ 43,338 33,197,391 $ 1.31 Six Months Ended June 30, 2019 Basic Income available to common stockholders $ 66,004 32,620,819 $ 2.02 Dilutive effect of stock options — 685,610 Diluted Income available to common stockholders plus assumed exercises of stock options $ 66,004 33,306,429 $ 1.98
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 period because the options were anti-dilutive for the period: Shares Three Months Ended June 30, 2020 448,016 Three Months Ended June 30, 2019 158,500 Six Months Ended June 30, 2020 424,939 Six Months Ended June 30, 2019 169,301

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of the periods presented, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Fair Value (Dollars in thousands) June 30, 2020 Securities available for sale: U.S. Treasury $ 512,861 $ — $ — $ 512,861 U.S. federal agencies — 21,181 — 21,181 Mortgage-backed securities — 16,582 — 16,582 States and political subdivisions — 41,048 590 41,638 Asset backed securities — — 12,714 12,714 December 31, 2019 Securities available for sale: U.S. Treasury $ 414,449 $ — $ — $ 414,449 U.S. federal agencies — 23,024 — 23,024 Mortgage-backed securities — 17,005 — 17,005 States and political subdivisions — 22,531 — 22,531 Asset backed securities — — 12,714 12,714
Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis	The changes in Level 3 assets measured at estimated fair value on a recurring basis during the periods presented were as follows: Six Months Ended June 30, Twelve Months Ended December 31, 2020 2019 (Dollars in thousands) Balance at the beginning of the year $ 12,714 $ 13,443 Transfers from level 2 1,644 — Settlements (1,047 ) (695 ) Total unrealized losses (7 ) (34 ) Balance at the end of the period $ 13,304 $ 12,714
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 Level 3 (Dollars in thousands) As of and for the Year-to-date Period Ended June 30, 2020 Equity securities $ 9,373 Collateral dependent loans 21,440 Repossessed assets 264 Other real estate owned 2,215 As of and for the Year-to-date Period Ended December 31, 2019 Equity securities $ 10,121 Collateral dependent loans 45,687 Repossessed assets 465 Other real estate owned 3,024
Estimated Fair Values of Financial Instruments	The estimated fair values of the Company’s financial instruments that are reported at amortized cost in the Company’s consolidated balance sheets, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows: June 30, December 31, 2020 2019 Carrying Amount Fair Value Carrying Amount Fair Value (Dollars in thousands) FINANCIAL ASSETS Level 2 inputs: Cash and cash equivalents $ 1,788,343 $ 1,788,343 $ 1,868,281 $ 1,868,281 Federal funds sold — — 1,000 1,000 Securities held for investment 75 78 1,403 1,403 Loans held for sale 21,902 21,902 11,001 11,001 Level 3 inputs: Securities held for investment 2,980 2,970 500 500 Loans, net of allowance for credit losses 6,585,454 6,643,225 5,607,905 5,625,005 FINANCIAL LIABILITIES Level 2 inputs: Deposits 8,486,671 8,503,240 7,483,635 7,497,429 Short-term borrowings 8,100 8,100 1,100 1,100 Long-term borrowings 3,000 2,989 — — Junior subordinated debentures 26,804 30,246 26,804 29,324 OFF-BALANCE SHEET FINANCIAL INSTRUMENTS Loan commitments 3,140 2,832 Letters of credit 476 485

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Results of Operations and Selected Financial Information	The results of operations and selected financial information for the four business units are as follows: Metropolitan Banks Community Banks Pegasus Bank Other Financial Services Executive, Operations & Support Eliminations Consolidated (Dollars in thousands) Three Months Ended June 30, 2020 Net interest income $ 22,310 $ 43,917 $ 4,976 $ 5,905 $ 100 $ — $ 77,208 Noninterest income 4,571 13,841 121 9,328 25,774 (21,553 ) 32,082 Income before taxes 3,613 15,532 1,345 7,786 18,232 (21,202 ) 25,306 Three Months Ended June 30, 2019 Net interest income $ 21,438 $ 44,775 $ — $ 1,411 $ 1,168 $ — $ 68,792 Noninterest income 4,635 16,243 — 10,105 37,917 (34,823 ) 34,077 Income before taxes 14,866 30,041 — 5,572 27,590 (34,241 ) 43,828 Six Months Ended June 30, 2020 Net interest income $ 44,494 $ 88,415 $ 10,584 $ 7,488 $ 300 $ — $ 151,281 Noninterest income 9,271 29,694 252 20,218 53,257 (45,465 ) 67,227 Income before taxes 14,026 39,968 2,943 13,545 27,635 (44,561 ) 53,556 Six Months Ended June 30, 2019 Net interest income $ 42,791 $ 88,182 $ — $ 2,582 $ 2,140 $ — $ 135,695 Noninterest income 8,844 31,128 — 19,978 73,438 (67,310 ) 66,078 Income before taxes 30,235 58,086 — 10,071 52,613 (66,163 ) 84,842 Total Assets: June 30, 2020 $ 3,035,989 $ 5,703,770 $ 774,939 $ 938,034 $ 248,390 $ (1,088,669 ) $ 9,612,453 December 31, 2019 2,806,021 4,998,247 738,351 102,442 950,920 (1,030,223 ) 8,565,758

Description of Business and S_4

Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Increase to retained earnings for cumulative effect of adopting ASU tax		$ 925,000
Addition to allowance for credit losses for financial assets purchased with credit deterioration			$ 502,000
Accrued interest receivable		31,000,000	$ 31,000,000	$ 27,400,000
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%
Processing fees received from the SBA			$ 30,000,000
ASU No. 2016-13 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Increase to retained earnings for cumulative effect of adopting ASU	$ 2,300,000
Increase to retained earnings for cumulative effect of adopting ASU tax	925,000
Addition to allowance for credit losses for financial assets purchased with credit deterioration	$ 1,200,000
Accrued interest receivable		$ 31,000,000	$ 31,000,000
Delinquency period placed on nonaccrual status loan			90 days
Commercial loans are charged off deemed uncollectible period		180 days	180 days
ASU No. 2016-13 [Member] | 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%

Description of Business and S_5

Description of Business and Summary of Significant Accounting Policies - Schedule of Impact of ASC 326 Adoption on Allowance for Credit losses on Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	$ 89,500	$ 70,080		$ 54,238	$ 55,108	$ 52,915	$ 51,389
Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			$ 54,238
ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			51,043
ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(3,195)
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	6,630	4,544		5,625
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			5,625
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,819
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(2,806)
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	9,483	5,935		8,358
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			8,358
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,851
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(5,507)
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	1,755	1,136		2,214
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,214
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			1,158
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(1,056)
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	2,259	1,618		1,933
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			1,933
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			1,155
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(778)
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	8,553	6,192		8,692
Real Estate [Member] | Residential Real Estate First Lien [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			8,692
Real Estate [Member] | Residential Real Estate First Lien [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			4,861
Real Estate [Member] | Residential Real Estate First Lien [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(3,831)
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	2,720	2,292		2,767	11,721	11,046	10,673
Real Estate [Member] | Residential Real Estate All Other [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,767
Real Estate [Member] | Residential Real Estate All Other [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			1,359
Real Estate [Member] | Residential Real Estate All Other [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(1,408)
Real Estate [Member] | Farmland [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,821
Real Estate [Member] | Farmland [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			1,413
Real Estate [Member] | Farmland [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(1,408)
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	44,505	37,276		15,345
Commercial and Agricultural Non-Real Estate [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			15,345
Commercial and Agricultural Non-Real Estate [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			27,194
Commercial and Agricultural Non-Real Estate [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			11,849
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	4,714	3,385		3,252	3,234	3,072	3,065
Consumer Non-real Estate [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			3,252
Consumer Non-real Estate [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,630
Consumer Non-real Estate [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(622)
Other Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	2,513	2,751		2,632	$ 2,449	$ 2,408	$ 2,423
Other Loans [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,632
Other Loans [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			2,516
Other Loans [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			(116)
Pegasus Bank [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans	$ 3,857	$ 3,163		$ 599
Pegasus Bank [Member] | Pre ASC 326 Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			599
Pegasus Bank [Member] | ASC 326 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			3,087
Pegasus Bank [Member] | ASC 326 [Member] | Impact of ASC Adoption [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses on loans			$ 2,488

Description of Business and S_6

Description of Business and Summary of Significant Accounting Policies - Schedule of Portfolio Segments Weighted Average Life, and Measures the Allowance for Credit Losses (Detail) - ASU No. 2016-13 [Member]	6 Months Ended
	Jun. 30, 2020
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	8 years
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	6 years
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	3 years
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	1 year
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	13 years
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	6 years
Real Estate [Member] | Farmland [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	12 years
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	3 years
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	4 years
Other Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	9 years
Pegasus Bank [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Segment, Life (in years)	4 years

Recent Developments Including M

Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) - USD ($)	Mar. 05, 2020	Aug. 15, 2019	Jan. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Business Combination Separately Recognized Transactions [Line Items]
Goodwill				$ 149,922,000	$ 148,604,000
Gain on sale of property held in other real estate owned			$ 2,200,000
COVID 19 [Member]
Business Combination Separately Recognized Transactions [Line Items]
Loans modification				$ 939,800,000
Citizens Bankshares, Inc [Member]
Business Combination Separately Recognized Transactions [Line Items]
Date of acquisition	Mar. 5, 2020
Total assets acquired	$ 47,800,000
Loans	22,900,000
Deposits	45,000,000
Purchase price	2,900,000
Intangibles assets, net	206,000
Goodwill	$ 1,300,000
Pegasus Bank [Member]
Business Combination Separately Recognized Transactions [Line Items]
Date of acquisition		Aug. 15, 2019

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Held for Investment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 3,055	$ 1,903
Gross Unrealized Gains	7	5
Gross Unrealized Losses	(14)	(5)
Estimated Fair Value	3,048	1,903
Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	75	93
Gross Unrealized Gains	4	4
Estimated Fair Value	79	97
States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,480	1,310
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(14)	(5)
Estimated Fair Value	2,469	1,306
Other Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	500	500
Estimated Fair Value	$ 500	$ 500

Securities - Summary of Amort_2

Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 592,008	$ 485,082
Gross Unrealized Gains	13,657	5,407
Gross Unrealized Losses	(689)	(766)
Estimated Fair Value	604,976	489,723
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	500,161	409,488
Gross Unrealized Gains	12,700	4,974
Gross Unrealized Losses		(13)
Estimated Fair Value	512,861	414,449
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,242	23,039
Gross Unrealized Gains	5	23
Gross Unrealized Losses	(66)	(38)
Estimated Fair Value	21,181	23,024
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,127	16,941
Gross Unrealized Gains	455	128
Gross Unrealized Losses		(64)
Estimated Fair Value	16,582	17,005
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	41,150	22,294
Gross Unrealized Gains	497	282
Gross Unrealized Losses	(9)	(45)
Estimated Fair Value	41,638	22,531
Asset backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,328	13,320
Gross Unrealized Losses	(614)	(606)
Estimated Fair Value	$ 12,714	$ 12,714

Securities - Maturity of Debt S

Securities - Maturity of Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 880	$ 300
Amortized cost, After one year but within five years	1,581	1,058
Amortized cost, After five years but within ten years	593	543
Amortized cost, After ten years	1	2
Amortized Cost	3,055	1,903
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	314,154	186,373
Amortized Cost, After one year but within five years	234,514	252,519
Amortized Cost, After five years but within ten years	4,918	5,873
Amortized Cost, After ten years	38,422	40,317
Amortized Cost	592,008	485,082
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	879	300
Estimated Fair Value, After one year but within five years	1,574	1,055
Estimated Fair Value, After five years but within ten years	594	546
Estimated Fair Value, After ten years	1	2
Estimated Fair Value	3,048	1,903
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	315,140	186,539
Estimated Fair Value, After one year but within five years	246,662	257,430
Estimated Fair Value, After five years but within ten years	5,074	6,008
Estimated Fair Value, After ten years	38,100	39,746
Total debt securities	$ 604,976	$ 489,723

Securities - Company's Book Val

Securities - Company's Book Value of Pledged Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Pledged Financial Instruments Not Separately Reported Securities Pledged By Type Of Security [Abstract]
Book value of pledged securities	$ 423,779	$ 445,702

Loans Held for Investment and_3

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	$ 6,674,954	$ 5,662,143
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	651,416	621,188
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	990,180	851,200
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	225,598	287,138
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	206,504	189,480
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	860,964	834,849
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	180,839	187,647
Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	256,136	246,988
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	1,470,523	1,499,404
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	360,740	359,529
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	987,250	154,015
Pegasus Bank [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	484,804	$ 430,705
Pegasus Bank [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans (net of unearned interest)	$ 246,000

Loans Held for Investment and_4

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Accrued interest receivable	$ 31	$ 27.4
Paycheck protection program loan	825.1
Paycheck protection program unamortized processing fees	$ 26.2

Loans Held for Investment and_5

Loans Held for Investment and Allowance for Credit Losses on Loans - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	$ 6,674,954,000		$ 6,674,954,000		$ 5,662,143,000
Paycheck protection program loan	825,100,000		825,100,000
Paycheck protection program unamortized processing fees	26,200,000		26,200,000
Paycheck protection program unamortized processing fees included in interest income	3,600,000		3,600,000
Interest income that would have been recognized			983,000	$ 1,000,000
Decrease in allowance for credit losses upon adoption of ASC 326			3,195,000
Provision for credit losses on loans	19,333,000	$ 2,433,000	38,916,000	$ 4,117,000
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Loans modification	$ 939,800,000		939,800,000
U.S. Federal Agencies [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual loans guaranteed by government agencies			$ 8,000,000
BancFirst’s [Member]
Financing Receivable Recorded Investment [Line Items]
Percentage of loans secured by real estate	50.00%		50.00%
BancFirst’s [Member] | Commercial and Agricultural Non-Real Estate [Member] | Ancillary Services [Member]
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	$ 78,000,000		$ 78,000,000		90,000,000
BancFirst’s [Member] | Energy [Member]
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	229,000,000		229,000,000		189,000,000
BancFirst’s [Member] | Energy [Member] | Midstream Energy Loans
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	45,000,000		45,000,000		41,000,000
Pegasus Bank [Member]
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	484,804,000		484,804,000		430,705,000
Decrease in allowance for credit losses upon adoption of ASC 326			(2,488,000)
Provision for credit losses on loans	(53,000)		587,000
Pegasus Bank [Member] | Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	$ 246,000,000		$ 246,000,000
Percentage of loans secured by real estate	51.00%		51.00%
Pegasus Bank [Member] | Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	$ 208,000,000		$ 208,000,000		172,000,000
Pegasus Bank [Member] | Energy [Member]
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	88,000,000		88,000,000		57,000,000
Pegasus Bank [Member] | Energy [Member] | Ancillary Services [Member]
Financing Receivable Recorded Investment [Line Items]
Loans (net of unearned interest)	$ 8,000,000		$ 8,000,000		$ 7,000,000

Loans Held for Investment and_6

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	Jun. 30, 2020	Dec. 31, 2019
Summary Of Nonperforming And Restructured Assets [Abstract]
Troubled debt restructurings	$ 3,213	$ 18,010
Other real estate owned and repossessed assets	$ 4,948	$ 6,073

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Amounts Included in Nonaccrual Loans Segregated by Portfolio Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 49,477	$ 17,965
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	2,094
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	463
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	119
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	3,904
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total		2,275
Real Estate [Member] | Non-residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total		1,815
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total		1,206
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	792	3,060
Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	3,118
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total		2,915
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	32,299
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	247	264
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	5,841	1,083
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total		4,496
Pegasus Bank [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans, Total	$ 600	$ 851

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Credit Losses on Loans - Age Analysis of Loans Held for Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 58,900	$ 49,793
Current Loans	6,616,054	5,612,350
Total Loans	6,674,954	5,662,143
Accruing Loans 90 Days or More Past Due	5,382	11,834
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,507
Current Loans	648,909
Total Loans	651,416	621,188
Accruing Loans 90 Days or More Past Due	77
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	350
Current Loans	989,830
Total Loans	990,180	851,200
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	952
Current Loans	224,646
Total Loans	225,598	287,138
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	396
Current Loans	206,108
Total Loans	206,504	189,480
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	9,478
Current Loans	851,486
Total Loans	860,964	834,849
Accruing Loans 90 Days or More Past Due	1,945
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,386
Current Loans	179,453
Total Loans	180,839	187,647
Accruing Loans 90 Days or More Past Due	63
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		7,726
Current Loans		699,690
Total Loans		707,416
Accruing Loans 90 Days or More Past Due		3,799
Real Estate [Member] | Non-residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		2,199
Current Loans		1,134,976
Total Loans		1,137,175
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		7,893
Current Loans		332,679
Total Loans		340,572
Accruing Loans 90 Days or More Past Due		1,660
Real Estate [Member] | Residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		8,065
Current Loans		912,767
Total Loans		920,832
Accruing Loans 90 Days or More Past Due		549
Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,794
Current Loans	250,342
Total Loans	256,136	246,988
Accruing Loans 90 Days or More Past Due	763
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	28,663
Current Loans	1,441,860
Total Loans	1,470,523	1,499,404
Accruing Loans 90 Days or More Past Due	2,154
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,772
Current Loans	357,968
Total Loans	360,740	359,529
Accruing Loans 90 Days or More Past Due	313
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	6,002	6,291
Current Loans	981,248	147,724
Total Loans	987,250	154,015
Accruing Loans 90 Days or More Past Due	67	4,426
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		5,499
Current Loans		1,448,894
Total Loans		1,454,393
Accruing Loans 90 Days or More Past Due		354
Consumer Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		4,279
Current Loans		358,075
Total Loans		362,354
Accruing Loans 90 Days or More Past Due		491
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		6,990
Current Loans		147,691
Total Loans		154,681
Accruing Loans 90 Days or More Past Due		555
Pegasus Bank [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	600	851
Current Loans	484,204	429,854
Total Loans	484,804	430,705
Pegasus Bank [Member] | Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	246,000
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	28,485	20,728
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	415
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	50
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	952
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	396
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	3,587
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	449
30 to 59 Days Past Due [Member] | Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		1,600
30 to 59 Days Past Due [Member] | Real Estate [Member] | Non-residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		971
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		4,705
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		4,496
30 to 59 Days Past Due [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,649
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	19,056
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,712
30 to 59 Days Past Due [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	219	1,670
30 to 59 Days Past Due [Member] | Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		2,290
30 to 59 Days Past Due [Member] | Consumer Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		2,829
30 to 59 Days Past Due [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		2,167
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	8,065	6,656
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	55
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	112
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	1,316
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	171
60 to 89 Days Past Due [Member] | Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		967
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		973
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		1,028
60 to 89 Days Past Due [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	888
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	4,766
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	595
60 to 89 Days Past Due [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	162	8
60 to 89 Days Past Due [Member] | Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		1,446
60 to 89 Days Past Due [Member] | Consumer Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		858
60 to 89 Days Past Due [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		1,376
90 Days and Greater [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	22,350	22,409
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	2,037
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	188
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	4,575
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	766
90 Days and Greater [Member] | Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		5,159
90 Days and Greater [Member] | Real Estate [Member] | Non-residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		1,228
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		2,215
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		2,541
90 Days and Greater [Member] | Real Estate [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,257
90 Days and Greater [Member] | Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,841
90 Days and Greater [Member] | Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	465
90 Days and Greater [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,621	4,613
90 Days and Greater [Member] | Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		1,763
90 Days and Greater [Member] | Consumer Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		592
90 Days and Greater [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans		3,447
90 Days and Greater [Member] | Pegasus Bank [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 600	$ 851

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Credit Losses on Loans - Gross Loans Held for Investment by Year of Origination and Internally Assigned Credit Grades (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable Recorded Investment [Line Items]
2020	$ 2,076,792
2019	1,417,140
2018	764,257
2017	547,712
2016	384,205
Prior	749,227
Revolving Loans Amortized Cost Basis	735,621
Total Loans	6,674,954	$ 5,662,143
Pegasus Bank [Member]
Financing Receivable Recorded Investment [Line Items]
2020	72,981
2019	108,242
2018	48,289
2017	52,447
2016	20,549
Prior	51,954
Revolving Loans Amortized Cost Basis	130,342
Total Loans	484,804	430,705
Pegasus Bank [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	55,924
2019	73,386
2018	41,076
2017	29,680
2016	15,297
Prior	42,601
Revolving Loans Amortized Cost Basis	91,378
Total Loans	349,342
Pegasus Bank [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	17,057
2019	34,856
2018	7,213
2017	22,767
2016	4,652
Prior	8,014
Revolving Loans Amortized Cost Basis	38,964
Total Loans	133,523
Pegasus Bank [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
Prior	1,339
Total Loans	1,339
Pegasus Bank [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2016	600
Total Loans	600
Real Estate [Member] | Pegasus Bank [Member]
Financing Receivable Recorded Investment [Line Items]
Total Loans	246,000
Real Estate [Member] | Farmland [Member]
Financing Receivable Recorded Investment [Line Items]
2020	35,792
2019	68,069
2018	35,797
2017	25,695
2016	23,121
Prior	47,899
Revolving Loans Amortized Cost Basis	19,763
Total Loans	256,136	246,988
Real Estate [Member] | Farmland [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	27,303
2019	32,686
2018	22,385
2017	16,365
2016	15,894
Prior	35,182
Revolving Loans Amortized Cost Basis	7,696
Total Loans	157,511
Real Estate [Member] | Farmland [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	7,741
2019	34,758
2018	7,341
2017	7,582
2016	6,262
Prior	10,985
Revolving Loans Amortized Cost Basis	8,486
Total Loans	83,155
Real Estate [Member] | Farmland [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	748
2019	625
2018	5,313
2017	1,109
2016	584
Prior	1,353
Revolving Loans Amortized Cost Basis	3,320
Total Loans	13,052
Real Estate [Member] | Farmland [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2018	758
2017	639
2016	381
Prior	379
Revolving Loans Amortized Cost Basis	261
Total Loans	2,418
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
2020	109,703
2019	146,884
2018	102,327
2017	68,444
2016	58,386
Prior	149,634
Revolving Loans Amortized Cost Basis	16,038
Total Loans	651,416	621,188
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	93,204
2019	115,392
2018	88,126
2017	56,119
2016	43,573
Prior	117,406
Revolving Loans Amortized Cost Basis	9,505
Total Loans	523,325
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	16,310
2019	31,307
2018	12,723
2017	10,742
2016	13,926
Prior	29,741
Revolving Loans Amortized Cost Basis	3,324
Total Loans	118,073
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	142
2019	107
2018	599
2017	1,583
2016	495
Prior	1,380
Revolving Loans Amortized Cost Basis	2,742
Total Loans	7,048
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	47
2019	78
2018	879
2016	392
Prior	1,107
Revolving Loans Amortized Cost Basis	467
Total Loans	2,970
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
2020	214,845
2019	250,360
2018	130,840
2017	114,570
2016	102,520
Prior	159,673
Revolving Loans Amortized Cost Basis	17,372
Total Loans	990,180	851,200
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	188,253
2019	178,055
2018	105,465
2017	90,957
2016	91,046
Prior	107,176
Revolving Loans Amortized Cost Basis	13,590
Total Loans	774,542
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	25,466
2019	68,282
2018	18,066
2017	23,070
2016	11,432
Prior	52,193
Revolving Loans Amortized Cost Basis	3,712
Total Loans	202,221
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	1,126
2019	3,929
2018	7,118
2017	543
2016	42
Prior	155
Revolving Loans Amortized Cost Basis	70
Total Loans	12,983
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2019	94
2018	191
Prior	149
Total Loans	434
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
2020	79,269
2019	87,273
2018	30,278
2017	6,412
2016	3,046
Prior	4,649
Revolving Loans Amortized Cost Basis	14,671
Total Loans	225,598	287,138
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	66,608
2019	76,743
2018	28,386
2017	5,535
2016	2,880
Prior	4,081
Revolving Loans Amortized Cost Basis	14,229
Total Loans	198,462
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	12,612
2019	8,249
2018	1,698
2017	853
2016	166
Prior	568
Revolving Loans Amortized Cost Basis	442
Total Loans	24,588
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	34
2019	2,211
2018	184
Total Loans	2,429
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2019	70
2018	10
2017	24
Total Loans	104
Real Estate [Member] | Construction and Development Less than 60 Months [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	15
Total Loans	15
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member]
Financing Receivable Recorded Investment [Line Items]
2020	114,754
2019	85,839
2018	580
2017	22
2016	37
Prior	513
Revolving Loans Amortized Cost Basis	4,759
Total Loans	206,504	189,480
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	94,678
2019	72,479
2018	69
2017	22
2016	37
Prior	32
Revolving Loans Amortized Cost Basis	4,727
Total Loans	172,044
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	18,660
2019	11,920
2018	114
Prior	481
Revolving Loans Amortized Cost Basis	32
Total Loans	31,207
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	1,416
2019	1,440
2018	397
Total Loans	3,253
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Recorded Investment [Line Items]
2020	155,132
2019	205,849
2018	120,514
2017	90,754
2016	73,054
Prior	215,661
Total Loans	860,964	834,849
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	135,181
2019	176,422
2018	94,426
2017	76,299
2016	56,326
Prior	169,576
Total Loans	708,230
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	16,067
2019	26,417
2018	23,633
2017	12,417
2016	13,232
Prior	37,470
Total Loans	129,236
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	3,796
2019	2,195
2018	1,597
2017	1,737
2016	2,340
Prior	6,592
Total Loans	18,257
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	88
2019	815
2018	858
2017	301
2016	1,105
Prior	2,023
Total Loans	5,190
Real Estate [Member] | Residential Real Estate First Lien [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
2016	51
Total Loans	51
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Recorded Investment [Line Items]
2020	15,350
2019	20,467
2018	15,839
2017	11,869
2016	7,422
Prior	17,752
Revolving Loans Amortized Cost Basis	92,140
Total Loans	180,839	187,647
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	13,054
2019	17,126
2018	13,224
2017	9,660
2016	6,747
Prior	13,647
Revolving Loans Amortized Cost Basis	32,726
Total Loans	106,184
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	2,064
2019	2,381
2018	1,545
2017	1,997
2016	415
Prior	2,999
Revolving Loans Amortized Cost Basis	59,063
Total Loans	70,464
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	180
2019	890
2018	996
2017	161
2016	226
Prior	386
Revolving Loans Amortized Cost Basis	311
Total Loans	3,150
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	52
2018	74
2017	51
2016	34
Prior	720
Revolving Loans Amortized Cost Basis	40
Total Loans	971
Real Estate [Member] | Residential Real Estate All Other [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
2019	70
Total Loans	70
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
2020	334,972
2019	268,939
2018	183,157
2017	127,834
2016	66,706
Prior	76,932
Revolving Loans Amortized Cost Basis	411,983
Total Loans	1,470,523	1,499,404
Commercial and Agricultural Non-Real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	245,805
2019	218,847
2018	148,454
2017	114,049
2016	56,916
Prior	48,438
Revolving Loans Amortized Cost Basis	310,921
Total Loans	1,143,430
Commercial and Agricultural Non-Real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	52,956
2019	46,418
2018	31,373
2017	9,951
2016	8,123
Prior	27,830
Revolving Loans Amortized Cost Basis	95,956
Total Loans	272,607
Commercial and Agricultural Non-Real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	9,530
2019	2,634
2018	2,494
2017	1,473
2016	1,517
Prior	398
Revolving Loans Amortized Cost Basis	4,724
Total Loans	22,770
Commercial and Agricultural Non-Real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	26,681
2019	989
2018	836
2017	2,361
2016	150
Prior	266
Revolving Loans Amortized Cost Basis	377
Total Loans	31,660
Commercial and Agricultural Non-Real Estate [Member] | Grade 5 [Member]
Financing Receivable Recorded Investment [Line Items]
2019	51
Revolving Loans Amortized Cost Basis	5
Total Loans	56
Consumer Non-real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
2020	103,379
2019	144,087
2018	68,325
2017	24,860
2016	9,529
Prior	4,236
Revolving Loans Amortized Cost Basis	6,324
Total Loans	360,740	359,529
Consumer Non-real Estate [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	97,332
2019	134,078
2018	62,491
2017	23,064
2016	8,531
Prior	3,601
Revolving Loans Amortized Cost Basis	6,040
Total Loans	335,137
Consumer Non-real Estate [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	5,823
2019	8,919
2018	5,049
2017	1,440
2016	822
Prior	451
Revolving Loans Amortized Cost Basis	268
Total Loans	22,772
Consumer Non-real Estate [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	207
2019	866
2018	574
2017	303
2016	127
Prior	114
Revolving Loans Amortized Cost Basis	15
Total Loans	2,206
Consumer Non-real Estate [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	17
2019	224
2018	211
2017	53
2016	49
Prior	70
Revolving Loans Amortized Cost Basis	1
Total Loans	625
Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
2020	840,615
2019	31,131
2018	28,311
2017	24,805
2016	19,835
Prior	20,324
Revolving Loans Amortized Cost Basis	22,229
Total Loans	987,250	$ 154,015
Other Loans [Member] | Grade 1 [Member]
Financing Receivable Recorded Investment [Line Items]
2020	840,615
2019	31,131
2018	28,254
2017	21,729
2016	18,562
Prior	17,839
Revolving Loans Amortized Cost Basis	20,228
Total Loans	978,358
Other Loans [Member] | Grade 2 [Member]
Financing Receivable Recorded Investment [Line Items]
2018	17
2017	3,011
2016	1,174
Prior	2,136
Revolving Loans Amortized Cost Basis	794
Total Loans	7,132
Other Loans [Member] | Grade 3 [Member]
Financing Receivable Recorded Investment [Line Items]
2018	14
2017	3
2016	71
Prior	229
Revolving Loans Amortized Cost Basis	122
Total Loans	439
Other Loans [Member] | Grade 4 [Member]
Financing Receivable Recorded Investment [Line Items]
2018	26
2017	62
2016	28
Prior	120
Revolving Loans Amortized Cost Basis	1,085
Total Loans	$ 1,321

Loans Held for Investment an_10

Loans Held for Investment and Allowance for Credit Losses on Loans - Activity in Allowance for Credit Losses on Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	$ 70,080	$ 52,915	$ 54,238	$ 51,389
Impact of CECL adoption			(3,195)
Initial allowance on loans purchased with credit deterioration			502
Charge- offs	(462)	(585)	(1,622)	(928)
Recoveries	549	345	661	530
Net charge-offs	87	(240)	(961)	(398)
Provision for credit losses on loans	19,333	2,433	38,916	4,117
Balance at end of period	89,500	55,108	89,500	55,108
Non-consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period		14,409		13,151
Charge- offs		(87)		(157)
Recoveries		85		152
Net charge-offs		(2)		(5)
Provision for credit losses on loans		825		2,086
Balance at end of period		15,232		15,232
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	4,544		5,625
Impact of CECL adoption			(2,806)
Initial allowance on loans purchased with credit deterioration			432
Charge- offs	(113)		(113)
Recoveries	1		1
Net charge-offs	(112)		(112)
Provision for credit losses on loans	2,198		3,491
Balance at end of period	6,630		6,630
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	5,935		8,358
Impact of CECL adoption			(5,507)
Provision for credit losses on loans	3,548		6,632
Balance at end of period	9,483		9,483
Real Estate [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	1,136		2,214
Impact of CECL adoption			(1,056)
Charge- offs	(56)		(59)
Recoveries	3		3
Net charge-offs	(53)		(56)
Provision for credit losses on loans	672		653
Balance at end of period	1,755		1,755
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	1,618		1,933
Impact of CECL adoption			(778)
Charge- offs	(28)		(29)
Net charge-offs	(28)		(29)
Provision for credit losses on loans	669		1,133
Balance at end of period	2,259		2,259
Real Estate [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	6,192		8,692
Impact of CECL adoption			(3,831)
Initial allowance on loans purchased with credit deterioration			7
Charge- offs	(66)		(218)
Recoveries	4		6
Net charge-offs	(62)		(212)
Provision for credit losses on loans	2,423		3,897
Balance at end of period	8,553		8,553
Real Estate [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	2,292	11,046	2,767	10,673
Impact of CECL adoption			(1,408)
Charge- offs	(7)	(143)	(32)	(195)
Recoveries	1	25	28	27
Net charge-offs	(6)	(118)	(4)	(168)
Provision for credit losses on loans	434	793	1,365	1,216
Balance at end of period	2,720	11,721	2,720	11,721
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period		6,655		6,328
Charge- offs		(3)		(9)
Recoveries				1
Net charge-offs		(3)		(8)
Provision for credit losses on loans		235		567
Balance at end of period		6,887		6,887
Real Estate [Member] | Non-residential Real Estate Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period		11,362		11,027
Charge- offs		(16)		(22)
Recoveries		1		1
Net charge-offs		(15)		(21)
Provision for credit losses on loans		(60)		281
Balance at end of period		11,287		11,287
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period		3,261		3,261
Charge- offs		(4)		(67)
Recoveries		4		9
Net charge-offs				(58)
Provision for credit losses on loans		64		122
Balance at end of period		3,325		3,325
Commercial and Agricultural Non-Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	37,276		15,345
Impact of CECL adoption			11,849
Initial allowance on loans purchased with credit deterioration			62
Charge- offs	(287)		(374)
Recoveries	66		83
Net charge-offs	(221)		(291)
Provision for credit losses on loans	7,450		17,540
Balance at end of period	44,505		44,505
Consumer Non-real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	3,385	3,072	3,252	3,065
Impact of CECL adoption			(622)
Charge- offs	(235)	(162)	(556)	(282)
Recoveries	57	38	114	109
Net charge-offs	(178)	(124)	(442)	(173)
Provision for credit losses on loans	1,507	286	2,526	342
Balance at end of period	4,714	3,234	4,714	3,234
Other Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	2,751	2,408	2,632	2,423
Impact of CECL adoption			(116)
Recoveries		43	2	78
Net charge-offs		43	2	78
Provision for credit losses on loans	(238)	(2)	(5)	(52)
Balance at end of period	2,513	2,449	2,513	2,449
Acquired Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period		702		1,461
Charge- offs		(170)		(196)
Recoveries		149		153
Net charge-offs		(21)		(43)
Provision for credit losses on loans		292		(445)
Balance at end of period		$ 973		$ 973
Farmland [Member] | Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	1,788		2,821
Impact of CECL adoption			(1,408)
Initial allowance on loans purchased with credit deterioration			1
Provision for credit losses on loans	723		1,097
Balance at end of period	2,511		2,511
Pegasus Bank [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of period	3,163		599
Impact of CECL adoption			2,488
Charge- offs	330		(241)
Recoveries	417		424
Net charge-offs	747		183
Provision for credit losses on loans	(53)		587
Balance at end of period	$ 3,857		$ 3,857

Loans Held for Investment an_11

Loans Held for Investment and Allowance for Credit Losses on Loans - Purchased Credit Deteriorated Loans (Detail) - Financial Asset Acquired with Credit Deterioration [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Purchase price of loans at acquisition	$ 1,586
Allowance for credit losses at acquisition	502
Par value of acquired loans at acquisition	$ 2,088

Loans Held for Investment an_12

Loans Held for Investment and Allowance for Credit Losses on Loans - Collateral-dependent Gross Loans Held for Investment by Collateral Type (Detail) $ in Thousands	Jun. 30, 2020USD ($)
Real Estate Asset [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	$ 7,139
Real Estate Asset [Member] | Pegasus Bank [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,265
Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	538
Energy Reserves [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	28,282
Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	887
Real Estate [Member] | Real Estate Asset [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	2,386
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	341
Real Estate [Member] | Real Estate Asset [Member] | Construction and Development Less than 60 Months [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	15
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	1,491
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	657
Real Estate [Member] | Real Estate Asset [Member] | Farmland [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	984
Commercial and Agricultural Non-Real Estate [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	515
Commercial and Agricultural Non-Real Estate [Member] | Energy Reserves [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	28,282
Commercial and Agricultural Non-Real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	760
Consumer Non-real Estate [Member] | Other Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	127
Other Loans [Member] | Business Assets [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Collateral Dependent Loans	$ 23

Loans Held for Investment an_13

Loans Held for Investment and Allowance for Credit Losses on Loans - Transfers from Loans and Premises and Equipment to Other Real Estate Owned and Repossessed Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Noncash Investing And Financing Items [Abstract]
Other real estate owned	$ 2,876	$ 2,010
Repossessed assets	722	627
Total	$ 3,598	$ 2,637

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 38,953	$ 39,247
Accumulated Amortization	(18,071)	(16,639)
Net Carrying Amount	20,882	22,608
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,562	35,856
Accumulated Amortization	(15,453)	(14,131)
Net Carrying Amount	20,109	21,725
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,391	3,391
Accumulated Amortization	(2,618)	(2,508)
Net Carrying Amount	$ 773	$ 883

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 148,604
Acquisitions	1,318
Balance at end of period	149,922
Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	13,767
Balance at end of period	13,767
Community Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	59,894
Acquisitions	1,318
Balance at end of period	61,212
Pegasus Bank [Member]
Goodwill [Line Items]
Balance at beginning of period	68,855
Balance at end of period	68,855
Other Financial Services [Member]
Goodwill [Line Items]
Balance at beginning of period	5,464
Balance at end of period	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at beginning of period	624
Balance at end of period	$ 624

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 05, 2020	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 149,922	$ 148,604
Citizens Bankshares, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Date of acquisition	Mar. 5, 2020
Goodwill	$ 1,300

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Rent expense for operating leases	$ 453,000	$ 376,000	$ 916,000	$ 767,000
Right of use lease asset	$ 4,800,000		$ 4,800,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	banf:AccruedInterestReceivableAndOtherAssetsMember		banf:AccruedInterestReceivableAndOtherAssetsMember
Operating lease liability	$ 4,608,000		$ 4,608,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	banf:AccruedInterestPayableAndOtherLiabilitiesMember		banf:AccruedInterestPayableAndOtherLiabilitiesMember
Operating lease weighted-average remaining lease term	3 years 2 months 12 days		3 years 2 months 12 days
Operating lease weighted-average discount rate	3.30%		3.30%
Operating lease revenue	$ 1,400,000	$ 1,500,000	$ 2,800,000	$ 3,100,000

Leases - Schedule of Maturity o

Leases - Schedule of Maturity of Operating Lease Liabilities (Detail) $ in Thousands	Jun. 30, 2020USD ($)
Leases [Abstract]
2020 (six months)	$ 782
2021	1,240
2022	993
2023	562
2024	339
Thereafter	1,165
Total lease payments	5,081
Less imputed Interest	(473)
Operating lease liability	$ 4,608

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	Jun. 30, 2020USD ($)
Leases [Abstract]
2020 (six months)	$ 2,022
2021	3,394
2022	2,810
2023	2,324
2024	1,783
2025-2030	4,496
Total future minimum lease payments	$ 16,829

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
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	330,000
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	30,000
Stock option plan termination date	Dec. 31, 2024
Option exercisable rate	25.00%
Option exercisable period	1 year
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	28,582
Number of shares of common stock distributed	1,307	8,362

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)$ / sharesshares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning period - Options | shares	1,257,730
Options granted | shares	157,500
Options exercised | shares	(26,400)
Options canceled, forfeited, or expired | shares	(135,000)
Outstanding at ending period - Options | shares	1,253,830
Exercisable at ending period - Options | shares	697,330
Outstanding at beginning period - Wgtd. Avg. Exercise Price | $ / shares	$ 32.70
Options granted - Wgtd. Avg. Exercise Price | $ / shares	49.32
Options exercised - Wgtd. Avg. Exercise Price | $ / shares	19.07
Options canceled, forfeited, or expired - Wgtd. Avg. Exercise Price | $ / shares	51.56
Outstanding at ending period - Wgtd. Avg. Exercise Price | $ / shares	33.04
Exercisable at ending period - Wgtd. Avg. Exercise Price | $ / shares	$ 24.13
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	8 years 11 months 4 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	7 years 1 month 13 days
Outstanding at ending period - Aggregate Intrinsic Value | $	$ 9,440
Exercisable at ending period - Aggregate Intrinsic Value | $	$ 11,461

Stock-Based Compensation - Opti

Stock-Based Compensation - Options Exercised Under Stock Option Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]
Total intrinsic value of options exercised	$ 337	$ 759	$ 726	$ 904
Cash received from options exercised	303	455	504	611
Tax benefit realized from options exercised	$ 86	$ 193	$ 185	$ 230

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Employee Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Labor And Related Expense [Abstract]
Stock-based compensation expense	$ 406	$ 367	$ 832	$ 541
Tax benefit	103	94	212	138
Stock-based compensation expense, net of tax	$ 303	$ 273	$ 620	$ 403

Stock-Based Compensation - Unea

Stock-Based Compensation - Unearned Stock-based Compensation Expense (Detail) $ in Thousands	Jun. 30, 2020USD ($)
Share Based Compensation [Abstract]
Unearned stock-based compensation expense	$ 4,128

Stock-Based Compensation - Assu

Stock-Based Compensation - Assumptions Used for Computing Stock-Based Compensation Expense (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 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	$ 10.63	$ 13.67
Risk-free interest rate, minimum	0.66%	2.62%
Risk-free interest rate, maximum	1.13%	2.76%
Dividend yield	2.00%	2.00%
Stock price volatility, minimum	22.84%	22.93%
Stock price volatility, maximum	33.56%	22.96%
Expected term	10 years	10 years

Stock - Based Compensation - Su

Stock - Based Compensation - Summary of Accumulated Stock Units (Detail) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Accumulated stock units	148,550	143,362
Average price	$ 27.85	$ 27.17

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Number of shares repurchased	59,284
Average price of shares repurchased	$ 52.26
Shares remaining to be repurchased	62,782	148,736

Stockholders' Equity - Required

Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Jun. 30, 2020USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 960,793
Total Capital To Risk Weighted Assets Actual Ratio	14.83%
Capital Required For Capital Adequacy Amount	$ 518,290
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Capital With Capital Conservation Buffer Amount	$ 680,256
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50%
Common Equity Tier 1 Risk Based Capital Amount	$ 853,705
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.18%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 291,538
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 453,504
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00%
Tier 1 Risk Based Capital Amount	$ 879,705
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.58%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 388,718
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 550,683
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50%
Tier 1 Capital Amount	$ 879,705
Tier 1 Capital To Average Assets Ratio	9.45%
Tier 1 Capital Required For Capital Adequacy Amount	$ 372,344
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00%
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 871,013
Total Capital To Risk Weighted Assets Actual Ratio	14.62%
Capital Required For Capital Adequacy Amount	$ 476,462
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Capital With Capital Conservation Buffer Amount	$ 625,357
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50%
Capital Required To Be Well Capitalized Amount	$ 595,578
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%
Common Equity Tier 1 Risk Based Capital Amount	$ 776,428
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.04%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 268,010
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 416,905
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 387,126
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.50%
Tier 1 Risk Based Capital Amount	$ 796,428
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.37%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 357,347
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 506,241
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 476,462
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00%
Tier 1 Capital Amount	$ 796,428
Tier 1 Capital To Average Assets Ratio	9.33%
Tier 1 Capital Required For Capital Adequacy Amount	$ 341,272
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00%
Tier 1 Capital Required To Be Well Capitalized Amount	$ 426,591
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5.00%
Pegasus Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 67,867
Total Capital To Risk Weighted Assets Actual Ratio	13.28%
Capital Required For Capital Adequacy Amount	$ 40,893
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Capital With Capital Conservation Buffer Amount	$ 53,672
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50%
Capital Required To Be Well Capitalized Amount	$ 51,116
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%
Common Equity Tier 1 Risk Based Capital Amount	$ 63,636
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.45%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 23,002
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 35,781
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 33,226
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.50%
Tier 1 Risk Based Capital Amount	$ 63,636
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.45%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 30,670
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 43,449
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 40,893
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00%
Tier 1 Capital Amount	$ 63,636
Tier 1 Capital To Average Assets Ratio	8.34%
Tier 1 Capital Required For Capital Adequacy Amount	$ 30,517
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00%
Tier 1 Capital Required To Be Well Capitalized Amount	$ 38,146
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5.00%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Jan. 01, 2020	Jun. 30, 2020
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%
ASU No. 2016-13 [Member]
Stockholders Equity [Line Items]
Increase to retained earnings for cumulative effect of adopting ASU	$ 2,300,000
Maximum [Member]
Stockholders Equity [Line Items]
Quantitative limit for trust preferred securities to be included in tier 1 capital		$ 15,000,000,000

Net Income Per Common Share - B

Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders	$ 20,730	$ 34,167	$ 43,338	$ 66,004
Income available to common stockholders plus assumed exercises of stock options	$ 20,730	$ 34,167	$ 43,338	$ 66,004
Income available to common stockholders - Shares	32,651,262	32,629,146	32,665,425	32,620,819
Dilutive effect of stock options - Shares	424,231	688,047	531,966	685,610
Income available to common stockholders plus assumed exercises of stock options - Shares	33,075,493	33,317,193	33,197,391	33,306,429
Income available to common stockholders - Per Share Amount	$ 0.64	$ 1.04	$ 1.33	$ 2.02
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 0.63	$ 1.02	$ 1.31	$ 1.98

Net Income Per Common Share - A

Net Income Per Common Share - Average Exercise Prices of Options Excluded from Computation of Diluted Net Income Per Common Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Abstract]
Shares	448,016	158,500	424,939	169,301

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 604,976	$ 489,723
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	512,861	414,449
U.S. Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	21,181	23,024
Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	16,582	17,005
States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	41,638	22,531
Asset backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	12,714	12,714
Level 1 Inputs [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	512,861	414,449
Level 2 Inputs [Member] | U.S. Federal Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	21,181	23,024
Level 2 Inputs [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	16,582	17,005
Level 2 Inputs [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	41,048	22,531
Level 3 Inputs [Member] | States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	590
Level 3 Inputs [Member] | Asset backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 12,714	$ 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	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward
Balance at the beginning of the year	$ 12,714	$ 13,443
Transfers from level 2	1,644
Settlements	(1,047)	(695)
Total unrealized losses	(7)	(34)
Balance at the end of the period	$ 13,304	$ 12,714

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument Fair Value Disclosure [Abstract]
Transfer of securities between levels of fair value hierarchy		$ 0
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

Fair Value Measurements - Asset

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Level 3 [Member] - Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 9,373	$ 10,121
Repossessed Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	264	465
Collateral Dependent Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	21,440	45,687
Other Real Estate Owned [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total Fair Value	$ 2,215	$ 3,024

Fair Value Measurements - Estim

Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
FINANCIAL ASSETS
Federal funds sold, Carrying Amount		$ 1,000
Securities held for investment, Carrying Amount	$ 3,055	1,903
Loans, net of allowance for credit losses,Carrying Amount	6,585,454	5,607,905
Securities held for investment, Fair Value	3,048	1,903
Loans held for sale, Fair Value	21,902	11,001
FINANCIAL LIABILITIES
Deposits, Carrying Amount	8,486,671	7,483,635
Short-term borrowings, Carrying Amount	8,100	1,100
Junior subordinated debentures, Carrying Amount	26,804	26,804
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments, Fair Value	3,140	2,832
Letters of credit, Fair Value	476	485
Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents, Carrying Amount	1,788,343	1,868,281
Federal funds sold, Carrying Amount		1,000
Securities held for investment, Carrying Amount	75	1,403
Loans held for sale, Carrying Amount	21,902	11,001
Cash and cash equivalents, Fair Value	1,788,343	1,868,281
Federal funds sold, Fair Value		1,000
Securities held for investment, Fair Value	78	1,403
Loans held for sale, Fair Value	21,902	11,001
FINANCIAL LIABILITIES
Deposits, Carrying Amount	8,486,671	7,483,635
Short-term borrowings, Carrying Amount	8,100	1,100
Long-term borrowings, Carrying Amount	3,000
Junior subordinated debentures, Carrying Amount	26,804	26,804
Deposits, Fair Value	8,503,240	7,497,429
Short-term borrowings, Fair Value	8,100	1,100
Long-term borrowings, Fair Value	2,989
Junior subordinated debentures, Fair Value	30,246	29,324
Level 3 Inputs [Member]
FINANCIAL ASSETS
Securities held for investment, Carrying Amount	2,980	500
Loans, net of allowance for credit losses,Carrying Amount	6,585,454	5,607,905
Securities held for investment, Fair Value	2,970	500
Loans, net of allowance for credit losses,Fair Value	$ 6,643,225	$ 5,625,005

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2020Business_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	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 77,208	$ 68,792	$ 151,281	$ 135,695
Noninterest income	32,082	34,077	67,227	66,078
Income before taxes	25,306	43,828	53,556	84,842
Total Assets	9,612,453		9,612,453		$ 8,565,758
Operating Segments [Member] | Metropolitan Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	22,310	21,438	44,494	42,791
Noninterest income	4,571	4,635	9,271	8,844
Income before taxes	3,613	14,866	14,026	30,235
Total Assets	3,035,989		3,035,989		2,806,021
Operating Segments [Member] | Community Banks [Member]
Segment Reporting Information [Line Items]
Net interest income	43,917	44,775	88,415	88,182
Noninterest income	13,841	16,243	29,694	31,128
Income before taxes	15,532	30,041	39,968	58,086
Total Assets	5,703,770		5,703,770		4,998,247
Operating Segments [Member] | Pegasus Bank [Member]
Segment Reporting Information [Line Items]
Net interest income	4,976		10,584
Noninterest income	121		252
Income before taxes	1,345		2,943
Total Assets	774,939		774,939		738,351
Operating Segments [Member] | Other Financial Services [Member]
Segment Reporting Information [Line Items]
Net interest income	5,905	1,411	7,488	2,582
Noninterest income	9,328	10,105	20,218	19,978
Income before taxes	7,786	5,572	13,545	10,071
Total Assets	938,034		938,034		102,442
Operating Segments [Member] | Executive, Operations & Support [Member]
Segment Reporting Information [Line Items]
Net interest income	100	1,168	300	2,140
Noninterest income	25,774	37,917	53,257	73,438
Income before taxes	18,232	27,590	27,635	52,613
Total Assets	248,390		248,390		950,920
Eliminations [Member]
Segment Reporting Information [Line Items]
Noninterest income	(21,553)	(34,823)	(45,465)	(67,310)
Income before taxes	(21,202)	$ (34,241)	(44,561)	$ (66,163)
Total Assets	$ (1,088,669)		$ (1,088,669)		$ (1,030,223)