(Former name, former address and former fiscal year, if changed since last report)

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

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

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

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

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

As of April ~~28, 2017~~30, 2018 there were ~~15,906,276~~32,713,215 shares of the registrant’s Common Stock outstanding.

	March 31,			December 31,			March 31,			December 31,
		2017			2016			2018			2017
	(unaudited)			(see Note 1)			(unaudited)			(see Note 1)
ASSETS
Cash and due from banks	$	180,051		$	183,921		$	181,863		$	216,104
Interest-bearing deposits with banks		1,857,961			1,666,540			1,590,240			1,541,771
Federal funds sold		200			700			21,097			700
Securities (fair value: $463,285 and $469,871, respectively)		463,250			469,833
Securities (fair value: $493,108 and $470,006, respectively)								493,101			469,995
Loans held for sale		7,754			9,318			6,197			6,173
Loans (net of unearned interest)		4,390,775			4,400,232			4,984,484			4,721,995
Allowance for loan losses		(47,921	)		(48,693	)		(51,550	)		(51,666	)
Loans, net of allowance for loan losses		4,342,854			4,351,539			4,932,934			4,670,329
Premises and equipment, net		127,124			126,771			141,163			134,088
Other real estate owned		4,018			3,526			3,478			4,136
Intangible assets, net		12,768			13,330			18,782			11,082
Goodwill		54,042			54,042			79,796			54,042
Accrued interest receivable and other assets		139,615			139,432			146,991			144,736
Total assets	$	7,189,637		$	7,018,952		$	7,615,642		$	7,253,156

LIABILITIES AND STOCKHOLDERS' EQUITY
Deposits:
Noninterest-bearing	$	2,652,691		$	2,526,842		$	2,629,984		$	2,550,150
Interest-bearing		3,741,936			3,721,215			4,083,068			3,864,895
Total deposits		6,394,627			6,248,057			6,713,052			6,415,045
Short-term borrowings		800			500			100			900
Accrued interest payable and other liabilities		32,378			27,342			32,435			29,623
Junior subordinated debentures		31,959			31,959			31,959			31,959
Total liabilities		6,459,764			6,307,858			6,777,546			6,477,527

Stockholders' equity:
Senior preferred stock, $1.00 par; 10,000,000 shares authorized; none issued		—			—			—			—
Cumulative preferred stock, $5.00 par; 900,000 shares authorized; none issued		—			—			—			—
Common stock, $1.00 par, 20,000,000 shares authorized; shares issued and outstanding: 15,891,276 and 15,810,935, respectively		15,891			15,811
Common stock, $1.00 par, 40,000,000 shares authorized; shares issued and outstanding: 32,707,166 and 31,894,563, respectively								32,708			31,895
Capital surplus		120,435			117,541			147,762			107,481
Retained earnings		593,631			577,648			661,341			638,580
Accumulated other comprehensive (loss) income, net of income tax of $54 and $(59), respectively		(84	)		94
Accumulated other comprehensive loss, net of income tax of $(1,269) and $(795), respectively								(3,715	)		(2,327	)
Total stockholders' equity		729,873			711,094			838,096			775,629
Total liabilities and stockholders' equity	$	7,189,637		$	7,018,952		$	7,615,642		$	7,253,156

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

	Three Months Ended						Three Months Ended
	March 31,						March 31,
		2017			2016			2018			2017
INTEREST INCOME
Loans, including fees	$	53,635		$	50,195		$	62,919		$	53,635
Securities:
Taxable		1,761			1,327			1,898			1,761
Tax-exempt		187			255			171			187
Federal funds sold								104			—
Interest-bearing deposits with banks		3,440			1,802			5,782			3,440
Total interest income		59,023			53,579			70,874			59,023
INTEREST EXPENSE
Deposits		3,725			3,080			7,269			3,725
Short-term borrowings		3			1			35			3
Junior subordinated debentures		527			522			535			527
Total interest expense		4,255			3,603			7,839			4,255
Net interest income		54,768			49,976			63,035			54,768
Provision for loan losses		72			4,103			314			72
Net interest income after provision for loan losses		54,696			45,873			62,721			54,696
NONINTEREST INCOME
Trust revenue		2,952			2,465			3,129			2,952
Service charges on deposits		15,778			14,710			16,653			15,778
Securities transactions (includes accumulated other comprehensive income reclassifications of $0 and $100, respectively)		—			100
Securities transactions (includes no accumulated other comprehensive income reclassifications)								(14	)		—
Income from sales of loans		632			562			651			632
Insurance commissions		4,563			4,135			5,199			4,563
Cash management		2,754			2,318			3,021			2,754
(Loss) gain on sale of other assets		(24	)		4
Gain (loss) on sale of other assets								26			(24	)
Other		1,430			1,323			1,445			1,430
Total noninterest income		28,085			25,617			30,110			28,085
NONINTEREST EXPENSE
Salaries and employee benefits		30,654			29,357			34,190			30,654
Occupancy, net		2,974			2,827			3,402			2,974
Depreciation		2,420			2,530			2,410			2,420
Amortization of intangible assets		547			581			733			547
Data processing services		1,195			1,215			1,203			1,195
Net expense (income) from other real estate owned		50			(1,141	)
Net expense from other real estate owned								26			50
Marketing and business promotion		2,215			1,855			2,352			2,215
Deposit insurance		588			839			619			588
Other		8,945			8,228			10,955			8,945
Total noninterest expense		49,588			46,291			55,890			49,588
Income before taxes		33,193			25,199			36,941			33,193
Income tax expense		11,143			8,620			7,321			11,143
Net income	$	22,050		$	16,579		$	29,620		$	22,050
NET INCOME PER COMMON SHARE
Basic	$	1.39		$	1.07		$	0.91		$	0.70
Diluted	$	1.36		$	1.05		$	0.89		$	0.68
OTHER COMPREHENSIVE INCOME
Unrealized (losses)/gains on securities, net of tax of $113 and $(374), respectively		(178	)		591
Reclassification adjustment for gains included in net income, net of tax of $0 and $39, respectively		—			(61	)
Other comprehensive (losses)/gains, net of tax of $113 and $(335), respectively		(178	)		530
OTHER COMPREHENSIVE LOSS
Unrealized losses on securities, net of tax of $474 and $113, respectively								(1,388	)		(178	)
Reclassification adjustment for losses included in net income								—			—
Other comprehensive losses, net of tax of $474 and $113, respectively								(1,388	)		(178	)
Comprehensive income	$	21,872		$	17,109		$	28,232		$	21,872

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

	Three Months Ended						Three Months Ended
	March 31,						March 31,
	2017			2016			2018			2017
COMMON STOCK
Issued at beginning of period	$	15,811		$	15,597		$	31,895		$	31,622
Shares issued		80			31
Shares acquired and canceled		—			(100	)
Shares issued for stock options								80			160
Shares issued for acquisitions								733			—
Issued at end of period	$	15,891		$	15,528		$	32,708		$	31,782
CAPITAL SURPLUS
Balance at beginning of period	$	117,541		$	102,865		$	107,481		$	101,730
Common stock issued		2,672			871
Tax effect of stock options		—			(209	)
Common stock issued for stock options								1,210			2,592
Common stock issued for acquisitions								38,765			—
Stock-based compensation arrangements		222			451			306			222
Balance at end of period	$	120,435		$	103,978		$	147,762		$	104,544
RETAINED EARNINGS
Balance at beginning of period	$	577,648		$	535,521		$	638,580		$	577,648
Net income		22,050			16,579			29,620			22,050
Dividends on common stock ($0.38 and $0.36 per share, respectively)		(6,067	)		(5,579	)
Common stock acquired and canceled		—			(5,423	)
Dividends on common stock ($0.21 and $0.19 per share, respectively)								(6,859	)		(6,067	)
Balance at end of period	$	593,631		$	541,098		$	661,341		$	593,631
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized gains on securities:
Balance at beginning of period	$	94		$	1,527		$	(2,327	)	$	94
Net change		(178	)		530			(1,388	)		(178	)
Balance at end of period	$	(84	)	$	2,057		$	(3,715	)	$	(84	)
Total stockholders’ equity	$	729,873		$	662,661		$	838,096		$	729,873

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

	Three Months Ended						Three Months Ended
	March 31,						March 31,
	2017			2016			2018			2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	22,050		$	16,579		$	29,620		$	22,050
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses		72			4,103			314			72
Depreciation and amortization		2,967			3,111			3,143			2,967
Net amortization of securities premiums and discounts		(47	)		148			(49	)		(47	)
Realized securities gains	—				(100	)
Realized securities losses								14		—
Gain on sales of loans		(632	)		(562	)		(651	)		(632	)
Cash receipts from the sale of loans originated for sale		43,005			40,271			44,558			43,005
Cash disbursements for loans originated for sale		(40,826	)		(33,610	)		(43,949	)		(40,826	)
Deferred income tax benefit		(485	)		(829	)		(117	)		(485	)
Loss/(gain) on other assets		35			(1,222	)
Decrease/(increase) in interest receivable		598			(176	)
(Gain)/loss on other assets								(21	)		35
(Increase)/decrease in interest receivable								(1,111	)		598
Increase in interest payable		22			13			353			22
Amortization of stock-based compensation arrangements		222			451			306			222
Excess tax benefit from stock-based compensation arrangements		(376	)	—				(647	)		(376	)
Other, net		5,310			300			(8,067	)		5,310
Net cash provided by operating activities	$	31,915		$	28,477		$	23,696		$	31,915
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid							$	6,248		$ —
Net decrease in federal funds sold		500		—				2,451			500
Purchases of available for sale securities		(20,511	)	—				(30,861	)		(20,511	)
Proceeds from maturities, calls and paydowns of held for investment securities		361			410			213			361
Proceeds from maturities, calls and paydowns of available for sale securities		26,489			55,071			5,729			26,489
Proceeds from sales of available for sale securities	—				299			1,460		—
Net change in loans		7,366			(45,010	)		48,819			7,366
Purchases of premises, equipment and computer software		(3,369	)		(2,939	)		(7,168	)		(3,369	)
Proceeds from the sale of other real estate owned and other assets		1,186			5,971			1,802			1,186
Net cash provided by investing activities		12,022			13,802			28,693			12,022
FINANCING ACTIVITIES
Net change in deposits		146,570			37,514			(31,953	)		146,570
Net increase in short-term borrowings		300			800
Issuance of common stock, net		2,752			693
Common stock acquired	—				(5,523	)
Net (decrease)/increase in short-term borrowings								(800	)		300
Issuance of common stock in connection with stock options, net								1,290			2,752
Cash dividends paid		(6,008	)		(5,615	)		(6,698	)		(6,008	)
Net cash provided by financing activities		143,614			27,869
Net cash (used in) provided by financing activities								(38,161	)		143,614
Net increase in cash, due from banks and interest-bearing deposits		187,551			70,148			14,228			187,551
Cash, due from banks and interest-bearing deposits at the beginning of the period		1,850,461			1,598,177			1,757,875			1,850,461
Cash, due from banks and interest-bearing deposits at the end of the period	$	2,038,012		$	1,668,325		$	1,772,103		$	2,038,012
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	$	4,235		$	3,591		$	7,486		$	4,235
Cash paid during the period for income taxes	$	1,100		$	1,050		$	1,250		$	1,100
Noncash investing and financing activities:
Stock issued in acquisitions							$	39,498		$	—
Cash consideration for acquisitions							$	24,722		$	—
Fair value of assets acquired in acquisitions							$	377,320		$	—
Liabilities assumed in acquisitions							$	338,860		$	—
Unpaid common stock dividends declared	$	6,028		$	5,579		$	6,854		$	6,028

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

The accounting and reporting policies of BancFirst Corporation and its subsidiaries (the “Company”) conform to accounting principles generally accepted in the United State 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, ~~2016.~~2017.

The accompanying unaudited interim consolidated financial statements include the accounts of BancFirst Corporation, First Bank of Chandler, Council Oak Partners, LLC, BancFirst Insurance Services, Inc., BancFirst Risk and Insurance Company and BancFirst and its subsidiaries. The principal operating subsidiaries of BancFirst are Council Oak Investment Corporation, Council Oak Real Estate, Inc. 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 the instructions for Form 10-Q. 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, ~~2016,~~2017, 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. There have been no significant changes in the accounting policies of the Company since December 31, ~~2016,~~2017, the date of the most recent annual report.

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 loan 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.

In March 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Topic 310-20): Premium Amortization on Purchased Callable Debt Securities.” ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium. The Company opted for early adoption of ASU 2017-08, as was permitted, on January 1, 2017. ASU 2017-08 did not have a significant impact on the Company’s financial statements and no prior periods were adjusted.

~~In October 2016,~~February 2018, the FASB issued ASU No. ~~2016-17, “Consolidation (Topic 810): Interests Held Through Related Parties That Are Under Common Control.”~~2018-2, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. ASU ~~2016-17 updates~~2018-2 allows a reclassification from accumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. ASU 2018-2 is effective for fiscal years beginning after December 15, 2018 with early adoption permitted. The Company elected to early adopt the provisions of ASU 2018-2 and the amount to reclassify was immaterial to the Company’s financial statements. The Company’s policy is to release material stranded tax effects on a specific identification basis.

In May 2017, the FASB issued ASU No. ~~2015-02~~2017-09, “Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting.” The amendments in this update provide guidance about types of changes to ~~amend~~ the ~~consolidation guidance on how a reporting~~terms of conditions of share-based payment awards that would require an entity ~~that is the single decision maker of a variable interest entity (“VIE”) should treat indirect interests in the entity held through related parties that are~~to apply modification accounting under ~~common control with the reporting entity when determining whether it is the primary beneficiary of that VIE.~~ASC 718. ASU ~~2016-17~~2017-09 was adopted on January 1, ~~2017~~2018 and did not have a significant impact on the Company’s financial statements and no prior periods were adjusted.

In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” Under ASU 2016-09 all excess tax benefits and tax deficiencies related to share-based payment awards should be recognized as income tax expense or benefit in the income statement during the period in which they occur. Previously, such amounts were recorded in the pool of excess tax benefits included in additional paid-in capital, if such pool was available. Because excess tax benefits are no longer recognized in additional paid-in capital, the assumed proceeds from applying the

treasury stock method when computing earnings per share should exclude the amount of excess tax benefits that would have previously been recognized in additional paid-in capital. Additionally, excess tax benefits should be classified along with other income tax cash flows as an operating activity rather than a financing activity, as was previously the case. ASU 2016-09 also allows entities to make an entity-wide accounting policy election to account for forfeitures when they occur, which the Company has elected to do. ASU 2016-09 changes the threshold to qualify for equity classification (rather than as a liability) to permit withholding up to the maximum statutory tax rates (rather than the minimum as was previously the case) in the applicable jurisdictions. ASU 2016-09 was adopted on January 1, 2017 and did not have a significant impact on the Company’s financial statements. In addition, ASU 2016-09 was applied prospectively and no prior periods were adjusted. The excess tax benefit for share-based payment awards that vested or were exercised during the three months ended March 31, 2017 was approximately $376,000.

In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements – Going Concern (Topic 205-40).” ASU 2014-15 provides guidance on management’s responsibility in evaluating whether there is substantial doubt about the Company’s ability to continue as a going concern and related footnote disclosures. For each reporting period, management will be required to evaluate whether there are conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year from the date the financial statements are issued. ASU 2014-15 was adopted on January 1, 2017. Adoption of ASU 2014-15 did not have a significant effect on the Company’s financial statements.

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 removes the second step of goodwill testing. ASU 2017-04 ~~will be~~is effective ~~on January 1, 2020~~for fiscal years beginning after December 31, 2019 with early adoption permitted. The Company elected to early adopt ASU 2017-4 and isit did not ~~expected to~~ have a significant impact on the Company’s financial statements.

In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business.” ASU 2017-01 clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of a business. ASU 2017-01 ~~will be effective~~was adopted on January 1, 2018 and isdid not ~~expected to~~ have a significant impact on the Company’s financial statements.

In October 2016, the FASB issued ASU No. 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.” ASU 2016-16 provides guidance stating that an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. ASU 2016-16 ~~will be effective~~was adopted on January 1, 2018 and isdid not ~~expected to~~ have a significant impact on the Company’s financial ~~statements.~~statements and no prior periods were adjusted.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 is intended to reduce the diversity in practice around how certain transactions are classified within the statement of cash flows. ASU 2016-15 ~~will be effective~~was adopted on January 1, ~~2018. Early adoption~~2018 and did not have a significant impact on the Company’s financial statements.

In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments – Overall (Subtopic 825-10).” ASU 2016-01 requires all equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in the fair value recognized through net income. ASU 2016-01 also emphasizes the existing requirement to use exit prices to measure fair value for disclosure purposes and clarifies that entities should not make use of a practicability exception in determining the fair value of loans. Accordingly, we refined the calculation used to determine the disclosed fair value of the Company’s loans held for investment as part of adopting this standard. The refined calculation did not have a significant impact on the Company’s fair value disclosures. ASU 2016-01 was adopted on January 1, 2018 and did not have a significant impact on the Company’s financial statements.

In January 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customer (Topic 606).” ASU 2014-09 implements a comprehensive new revenue recognition standard that will supersede substantially all existing revenue recognition guidance. The new standard’s core principle is ~~permitted~~that a company will recognize revenue when it transfers promised goods or services to customers in a manner that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The guidance does not apply to revenue associated with ~~retrospective applications. The Company is currently evaluating~~financial instruments, including loans and securities that are accounted for under other GAAP, which comprises a significant portion of the ~~potential~~Company’s revenue stream. ASU 2014-09 was adopted on January 1, 2018 and did not have a significant impact ~~of ASU 2016-15~~ on ~~its~~the Company’s financial statements.

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 requires a financial asset measured at amortized cost basis to be presented at the net amount expected to be collected. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. ASU 2016-13 requires enhanced disclosures related to the significant estimates and judgements used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. In addition, ASU 2016-13 amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. ASU 2016-13 will be effective for the Company on January 1, 2020. The Company is currently evaluating the potential impact of ASU 2016-13 on its financial statements. In that regard, the Company has formed a task force under the direction of its Chief Financial Officer. The Company is currently developing an implementation plan to include assessment of process, portfolio segmentation, model development, system requirements and the identification of data and resource need, among other things.

In February 2016, the FASB issued ASU No. 2016-02, “Leases - (Topic 842).” ASU 2016-02 requires that lessees recognize on the balance sheet the assets and liabilities for the rights and obligations created by leases. The amendments are effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted. Adoption of ASU 2016-02 is not expected to have a significant effect on the Company’s financial statements.

On January ~~2016,~~11, 2018, the ~~FASB issued ASU No. 2016-01, “Financial Instruments - Overall (Subtopic 825-10).” ASU 2016-01 require all~~Company acquired First Wagoner Corp. and its subsidiary bank, First Bank & Trust Company, with locations in Carney, Grove, Ketchum, Luther, Tulsa and Wagoner. First Bank & Trust Company had approximately $290 million in total assets, $247 million in loans, $251 million in deposits and $36 million in equity ~~investments (except those accounted for under the equity method~~capital. First Bank & Trust Company operated as a subsidiary of ~~accounting or those that~~BancFirst Corporation until it was merged into BancFirst on February 16, 2018. As a result ~~in consolidation~~ of the ~~investee) to be measured at~~acquisition, the Company recorded a core deposit intangible of approximately $6.3 million and goodwill of approximately $19.1 million. These fair value ~~with changes~~estimates are considered preliminary and are subject to change for up to one year after the closing date of the acquisition as additional information becomes available. The effect of this acquisition was included in the ~~fair value recognized through net income. In addition, the amendment will require an entity to present separately in other comprehensive income the portion~~consolidated financial statements of the ~~total change in~~

Company from the ~~fair value~~date of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments.acquisition forward. The ~~amendments are effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. Early adoption is~~acquisition did not ~~permitted. Adoption of ASU 2016-01 is not expected to~~ have a ~~significant~~material effect on the Company’s consolidated financial statements. The acquisition of First Wagoner Corp. and its subsidiary bank, First Bank & Trust Company complements the Company’s community banking strategy by adding five communities to its banking network in Oklahoma.

InOn January 11, 2018, the Company acquired First Chandler Corp. and its subsidiary bank, First Bank of ~~2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts~~Chandler, with ~~Customer (Topic 606).” ASU 2014-09 implements a comprehensive new revenue recognition standard that~~two locations in Chandler. First Bank of Chandler had approximately $88 million in total assets, $66 million in loans, $79 million in deposits and $11 million in equity capital. The bank will ~~supersede substantially all existing revenue recognition guidance. The new standard’s core principle~~operate as First Bank of Chandler until it is ~~that a company will recognize revenue when it transfers promised goods or services to customers in a manner that reflects the consideration to~~merged into BancFirst, which ~~the company expects~~is expected to be ~~entitled~~during the third quarter of 2018. As a result of the acquisition, the Company recorded a core deposit intangible of approximately $2.2 million and goodwill of approximately $6.7 million. These fair value estimates are considered preliminary and are subject to change for up to one year after the closing date of the acquisition as additional information becomes available. The effect of this acquisition was included in ~~exchange for those goods or services.~~the consolidated financial statements of the Company from the date of acquisition forward. The ~~guidance does~~acquisition did not ~~apply to revenue associated with~~have a material effect on the Company’s consolidated financial ~~instruments, including loans~~statements. The acquisition of First Chandler Corp. and ~~securities that are accounted for under other GAAP, which comprises~~its subsidiary bank, First Bank of Chandler complements the Company’s community banking strategy by increasing its banking network in Oklahoma.

On July 31, 2017, the Company completed a ~~significant portion~~two-for-one stock split of the Company’s ~~revenue stream. In August 2015,~~outstanding shares of common stock. The stock was payable in the ~~FASB issued ASU No. 2015-14, “Revenue from Contracts with Customers (Topic 606).” ASU 2015-14 is an amendment~~form of a dividend on or about July 31, 2017 to ~~defer~~shareholders of record of the ~~effective~~outstanding common stock as of the close of business record date of ~~ASU N. 2014-09. The amendments are effective~~July 17, 2017. Stockholders received one additional share for ~~annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. Adoption of ASU 2014-09 may require~~each share held on that date. This was the second stock split for the Company since going public. All share and per share amounts in these consolidated financial statements and related notes have been retroactively adjusted to amend how it recognizes certain recurring revenue streams related to trust fees, which are recorded in non-interest expense; however, the Company does not expect the adoption of ASU 2014-09 to have a significant impact on the Company’s financial statements.

The following table summarizes securities held for investment and securities available for sale:

	March 31, 2017		December 31, 2016		March 31, 2018		December 31, 2017
	(Dollars in thousands)				(Dollars in thousands)
Held for investment, at cost (fair value: $4,038 and $4,403, respectively)	$	4,003	$	4,365
Held for investment, at cost (fair value: $2,086 and $2,303, respectively)					$	2,079	$	2,292
Available for sale, at fair value		459,247		465,468		491,022		467,703
Total	$	463,250	$	469,833	$	493,101	$	469,995

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


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
March 31, 2017	(Dollars in thousands)
March 31, 2018										(Dollars in thousands)
Mortgage backed securities (1)	$	233	$	15	$	—		$	248	$	174	$	7	$	—		$	181
States and political subdivisions		3,270		22		(2	)		3,290		1,405		1		(1	)		1,405
Other securities		500		—		—			500		500		—		—			500
Total	$	4,003	$	37	$	(2	)	$	4,038	$	2,079	$	8	$	(1	)	$	2,086
December 31, 2016
December 31, 2017
Mortgage backed securities (1)	$	252	$	17	$	—		$	269	$	187	$	10	$	—		$	197
States and political subdivisions		3,613		25		(4	)		3,634		1,605		3		(2	)		1,606
Other securities		500		—		—			500		500		—		—			500
Total	$	4,365	$	42	$	(4	)	$	4,403	$	2,292	$	13	$	(2	)	$	2,303

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


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
March 31, 2017	(Dollars in thousands)
March 31, 2018										(Dollars in thousands)
U.S. treasuries	$	289,248	$	723	$	(538	)	$	289,433	$	344,978	$	74	$	(3,803	)	$	341,249
U.S. federal agencies		105,166		307		(415	)		105,058		86,172		11		(283	)		85,900
Mortgage backed securities (1)		19,369		271		(567	)		19,073		18,114		165		(594	)		17,685
States and political subdivisions		38,856		853		(71	)		39,638		39,654		412		(143	)		39,923
Other securities (2)		6,746		125		(826	)		6,045		7,088		71		(894	)		6,265
Total	$	459,385	$	2,279	$	(2,417	)	$	459,247	$	496,006	$	733	$	(5,717	)	$	491,022
December 31, 2016
December 31, 2017
U.S. treasuries	$	268,763	$	700	$	(920	)	$	268,543	$	314,905	$	—	$	(2,103	)	$	312,802
U.S. federal agencies		129,674		373		(405	)		129,642		89,098		82		(329	)		88,851
Mortgage backed securities (1)		19,949		290		(567	)		19,672		18,358		204		(586	)		17,976
States and political subdivisions		40,335		836		(129	)		41,042		41,937		554		(121	)		42,370
Other securities (2)		6,594		125		(150	)		6,569		6,527		71		(894	)		5,704
Total	$	465,315	$	2,324	$	(2,171	)	$	465,468	$	470,825	$	911	$	(4,033	)	$	467,703

The maturities of 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.

	March 31, 2017				December 31, 2016				March 31, 2018				December 31, 2017
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
	(Dollars in thousands)								(Dollars in thousands)
Held for Investment
Contractual maturity of debt securities:
Within one year	$	1,563	$	1,573	$	1,561	$	1,568	$	1,036	$	1,036	$	1,036	$	1,034
After one year but within five years		1,751		1,762		1,937		1,951		422		422		623		627
After five years but within ten years		673		687		707		723		613		620		625		633
After ten years		16		16		160		161		8		8		8		9
Total	$	4,003	$	4,038	$	4,365	$	4,403	$	2,079	$	2,086	$	2,292	$	2,303
Available for Sale
Contractual maturity of debt securities:
Within one year	$	75,206	$	75,378	$	66,542	$	66,662	$	162,621	$	162,261	$	113,225	$	112,974
After one year but within five years		308,182		308,229		320,150		319,839		268,010		264,525		289,038		287,058
After five years but within ten years		6,318		6,666		5,830		6,152		5,616		5,819		6,222		6,500
After ten years		62,933		62,929		66,199		66,246		52,671		52,152		55,813		55,467
Total debt securities		452,639		453,202		458,721		458,899		488,918		484,757		464,298		461,999
Equity securities		6,746		6,045		6,594		6,569		7,088		6,265		6,527		5,704
Total	$	459,385	$	459,247	$	465,315	$	465,468	$	496,006	$	491,022	$	470,825	$	467,703

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:

	March 31, 2017					December 31, 2016					March 31, 2018					December 31, 2017
	Amount		Percent			Amount		Percent			Amount		Percent			Amount		Percent
	(Dollars in thousands)										(Dollars in thousands)
Commercial and financial:
Commercial and industrial	$	834,561		19.01	%	$	828,260		18.82	%	$	1,045,706		20.98	%	$	995,207		21.08	%
Oil & gas production and equipment		84,976		1.93			84,228		1.91			91,051		1.83			95,574		2.02
Agriculture		139,542		3.18			144,751		3.29			142,146		2.85			141,249		2.99
State and political subdivisions:
Taxable		32,597		0.74			33,793		0.77			70,932		1.42			73,827		1.56
Tax-exempt		48,313		1.10			47,283		1.07			51,765		1.04			48,626		1.03
Real estate:
Construction		417,148		9.50			420,884		9.57			445,744		8.94			437,277		9.26
Farmland		201,450		4.59			197,872		4.50			220,882		4.43			195,162		4.13
One to four family residences		843,731		19.22			846,360		19.24			966,006		19.38			875,766		18.55
Multifamily residential properties		48,302		1.10			57,806		1.31			59,469		1.19			46,030		0.98
Commercial		1,433,707		32.65			1,426,643		32.42			1,555,340		31.21			1,487,927		31.51
Consumer		272,637		6.21			279,704		6.36			295,148		5.92			284,373		6.02
Other (not classified above)		33,811		0.77			32,648		0.74			40,295		0.81			40,977		0.87
Total loans	$	4,390,775		100.00	%	$	4,400,232		100.00	%	$	4,984,484		100.00	%	$	4,721,995		100.00	%

The Company’s commercial and industrial loan category includes a small percentage of loans to companies that provide ancillary services to the oil and gas industry, such as transportation, preparation contractors and equipment manufacturers. The balance of these loans was approximately $58 million at March 31, 2017 and approximately $56 million at December 31, 2016.

The Company’s loans are mostly to customers within Oklahoma and over 65% 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.

The Company’s commercial and industrial loan category includes a small percentage of loans to companies that provide ancillary services to the oil and gas industry, such as transportation, preparation contractors and equipment manufacturers. The balance of these loans was approximately $67 million at March 31, 2018 and approximately $81 million at December 31, 2017.

Accounting policies related to appraisals, nonaccruals and charge-offs are disclosed in Note (1) to the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2016.~~2017.

	March 31,		December 31,		March 31,		December 31,
	2017		2016		2018		2017
	(Dollars in thousands)				(Dollars in thousands)
Past due 90 days or more and still accruing	$	2,024	$	1,962	$	3,900	$	2,893
Nonaccrual		23,694		31,798		31,849		31,943
Restructured		2,203		1,713		12,945		4,720
Total nonperforming and restructured loans		27,921		35,473		48,694		39,556
Other real estate owned and repossessed assets		4,404		3,866		3,676		4,424
Total nonperforming and restructured assets	$	32,325	$	39,339	$	52,370	$	43,980

~~Nonaccrual loans, accruing loans past due 90 days or more, and restructured loans are shown in the table above.~~ Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $542,000 for the three months ended March 31, 2018 and approximately $499,000 for the three months ended March 31, ~~2017 and approximately $513,000 for the three months ended March 31, 2016.~~2017.

The Company charges interest on principal balances outstanding on restructured loans during deferral periods. The current and future financial effects of the recorded balance of loans considered to be restructured were not considered to be material.

Loans are segregated into classes based upon the nature of the collateral and the borrower. These classes are used to estimate the ~~credit risk component in the~~ allowance for loan losses.

The following table is a summary of amounts included in nonaccrual loans, segregated by class of loans. Residential real estate refers to one-to-four family real estate.

	March 31, 2017		December 31, 2016		March 31, 2018		December 31, 2017
	(Dollars in thousands)				(Dollars in thousands)
Real estate:
Non-residential real estate owner occupied	$	599	$	713	$	1,082	$	1,108
Non-residential real estate other		2,087		5,688		9,131		9,809
Residential real estate permanent mortgage		1,397		1,116		986		781
Residential real estate all other		4,726		5,089		3,911		3,980
Commercial and financial:
Non-consumer non-real estate		3,643		4,464		7,914		7,785
Consumer non-real estate		286		265		310		250
Other loans		5,033		8,370		2,467		5,596
Acquired loans		5,923		6,093		6,048		2,634
Total	$	23,694	$	31,798	$	31,849	$	31,943

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 past due loans, segregated by class of loans:

		Age Analysis of Past Due Loans														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		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)														(Dollars in thousands)
As of March 31, 2017
As of March 31, 2018
Real estate:
Non-residential real estate owner occupied		$	1,183	$	526	$	1,034	$	2,743	$	573,970	$	576,713	$	983	$	1,072	$	30	$	872	$	1,974	$	670,610	$	672,584	$	—
Non-residential real estate other			1,985		29		250		2,264		1,125,063		1,127,327		—		1,957		32		2,148		4,137		1,108,882		1,113,019		239
Residential real estate permanent mortgage			1,900		756		1,085		3,741		319,986		323,727		232		2,599		661		1,027		4,287		326,763		331,050		711
Residential real estate all other			5,036		337		982		6,355		732,679		739,034		252		4,503		778		1,870		7,151		771,129		778,280		1,562
Commercial and financial:
Non-consumer non-real estate			3,837		1,722		272		5,831		1,053,489		1,059,320		108		3,481		302		2,961		6,744		1,249,968		1,256,712		116
Consumer non-real estate			1,954		595		502		3,051		273,007		276,058		384		1,530		359		638		2,527		282,233		284,760		440
Other loans			5,143		826		4,760		10,729		131,804		142,533		51		779		107		2,148		3,034		135,643		138,677		141
Acquired loans			1,104		20		2,537		3,661		142,402		146,063		14		3,010		1,223		2,398		6,631		402,771		409,402		691
Total		$	22,142	$	4,811	$	11,422	$	38,375	$	4,352,400	$	4,390,775	$	2,024	$	18,931	$	3,492	$	14,062	$	36,485	$	4,947,999	$	4,984,484	$	3,900
As of December 31, 2016
As of December 31, 2017
Real estate:
Non-residential real estate owner occupied		$	2,255	$	96	$	150	$	2,501	$	569,130	$	571,631	$	—	$	998	$	68	$	977	$	2,043	$	639,575	$	641,618	$	84
Non-residential real estate other			611		16		418		1,045		1,122,351		1,123,396		—		2,905		271		2,112		5,288		1,121,303		1,126,591		432
Residential real estate permanent mortgage			2,742		649		1,273		4,664		320,749		325,413		513		2,211		403		977		3,591		326,743		330,334		584
Residential real estate all other			2,559		531		1,416		4,506		743,723		748,229		369		1,739		749		1,377		3,865		781,790		785,655		973
Commercial and financial:
Non-consumer non-real estate			1,269		1,628		741		3,638		1,047,547		1,051,185		608		2,210		706		1,785		4,701		1,279,704		1,284,405		403
Consumer non-real estate			2,046		760		419		3,225		280,652		283,877		274		2,085		670		293		3,048		285,872		288,920		194
Other loans	��		5,345		958		7,775		14,078		127,404		141,482		45		506		103		3,916		4,525		139,920		144,445		—
Acquired loans			825		310		408		1,543		153,476		155,019		153		753		192		713		1,658		118,369		120,027		223
Total		$	17,652	$	4,948	$	12,600	$	35,200	$	4,365,032	$	4,400,232	$	1,962	$	13,407	$	3,162	$	12,150	$	28,719	$	4,693,276	$	4,721,995	$	2,893

Loans are considered impaired when, based on current information and events, it is probable the Company will be unable to collect the full amount of scheduled principal and interest payments in accordance with the original contractual terms of the loan agreement. If a loan is impaired, a specific valuation allowance may be allocated, if necessary, so that the loan is reported, net of

allowance for loss, at the present value of future cash flows using the loan’s existing rate, or the fair value of collateral if repayment is expected solely from the collateral.

The following table presents impaired loans, segregated by class of loans. During the period ended March 31, 2017, $2.3 million of interest income was recognized on impaired loans subsequent to their classification as impaired. During ~~previous periods~~the period ended March 31, 2018 no material amount of interest income was recognized on impaired loans subsequent to their classification as impaired.

	Impaired Loans								Impaired Loans
	Unpaid Principal Balance		Recorded Investment with Allowance		Related Allowance		Average Recorded Investment		Unpaid Principal Balance		Recorded Investment with Allowance		Related Allowance		Average Recorded Investment
	(Dollars in thousands)								(Dollars in thousands)
As of March 31, 2017
As of March 31, 2018
Real estate:
Non-residential real estate owner occupied	$	1,766	$	1,672	$	73	$	1,026	$	7,580	$	7,507	$	296	$	5,944
Non-residential real estate other		2,175		2,087		448		4,809		10,137		9,941		532		10,023
Residential real estate permanent mortgage		1,884		1,682		129		1,808		2,118		1,918		138		1,835
Residential real estate all other		5,364		5,123		1,513		5,388		6,906		6,611		2,372		6,241
Commercial and financial:
Non-consumer non-real estate		11,474		5,461		1,486		5,882		19,526		12,407		2,448		11,705
Consumer non-real estate		814		777		141		776		850		817		134		783
Other loans		6,606		5,084		673		5,276		2,991		2,608		99		2,570
Acquired loans		8,196		6,186		—		6,472		9,454		6,492		4		5,086
Total	$	38,279	$	28,072	$	4,463	$	31,437	$	59,562	$	48,301	$	6,023	$	44,187

As of December 31, 2016
As of December 31, 2017
Real estate:
Non-residential real estate owner occupied	$	894	$	806	$	101	$	825	$	2,011	$	1,945	$	141	$	1,858
Non-residential real estate other		7,742		5,688		574		5,854		10,323		10,240		496		3,975
Residential real estate permanent mortgage		1,878		1,683		124		1,612		1,745		1,542		146		1,440
Residential real estate all other		5,871		5,614		1,538		5,445		5,837		5,549		2,135		5,258
Commercial and financial:
Non-consumer non-real estate		12,015		6,272		1,457		6,478		18,101		11,158		2,412		11,131
Consumer non-real estate		686		650		133		788		545		514		127		541
Other loans		9,799		8,415		1,870		8,062		6,092		5,595		178		7,439
Acquired loans		8,780		6,581		—		6,041		4,737		3,145		12		3,539
Total	$	47,665	$	35,709	$	5,797	$	35,105	$	49,391	$	39,688	$	5,647	$	35,181

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.

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, ~~2016.~~2017.

	Internal Loan Grading												Internal Loan Grading
	Grade												Grade
		1		2		3		4		5	Total			1		2		3		4		5	Total
	(Dollars in thousands)												(Dollars in thousands)
As of March 31, 2017
As of March 31, 2018
Real estate:
Non-residential real estate owner occupied	$	469,833	$	91,517	$	14,764	$	599	$	—	$	576,713	$	530,979	$	121,730	$	18,485	$	1,390	$	—	$	672,584
Non-residential real estate other		931,160		179,042		15,038		2,087		—		1,127,327		912,482		182,611		8,645		9,281		—		1,113,019
Residential real estate permanent mortgage		281,991		33,986		6,121		1,629		—		323,727		287,363		34,047		7,562		2,078		—		331,050
Residential real estate all other		601,273		121,042		11,756		4,963		—		739,034		611,885		151,133		9,587		5,675		—		778,280
Commercial and financial:
Non-consumer non-real estate		830,209		203,922		21,216		3,973		—		1,059,320		982,927		244,432		22,054		7,270		29		1,256,712
Consumer non-real estate		255,874		17,116		2,367		701		—		276,058		263,827		18,099		1,939		895		—		284,760
Other loans		135,396		5,678		1,365		94		—		142,533		132,305		5,318		873		181		—		138,677
Acquired loans		87,373		39,256		13,310		6,124		—		146,063		237,669		124,669		40,793		6,271		—		409,402
Total	$	3,593,109	$	691,559	$	85,937	$	20,170	$	—	$	4,390,775	$	3,959,437	$	882,039	$	109,938	$	33,041	$	29	$	4,984,484

As of December 31, 2016
As of December 31, 2017
Real estate:
Non-residential real estate owner occupied	$	464,504	$	89,978	$	16,220	$	929	$	—	$	571,631	$	520,641	$	105,696	$	13,852	$	1,429	$	—	$	641,618
Non-residential real estate other		933,743		169,561		14,404		5,688		—		1,123,396		931,295		178,282		14,290		2,724		—		1,126,591
Residential real estate permanent mortgage		284,893		32,889		5,987		1,644		—		325,413		289,200		33,033		6,352		1,749		—		330,334
Residential real estate all other		614,338		119,018		9,382		5,491		—		748,229		621,401		149,201		9,418		5,635		—		785,655
Commercial and financial:
Non-consumer non-real estate		856,318		170,865		19,101		4,901		—		1,051,185		1,018,172		234,884		24,322		6,997		30		1,284,405
Consumer non-real estate		263,442		17,154		2,640		641		—		283,877		268,826		17,499		2,038		557		—		288,920
Other loans		132,254		5,376		1,514		2,338		—		141,482		136,617		5,668		1,203		957		—		144,445
Acquired loans		92,946		42,668		12,888		6,517		—		155,019		65,685		34,418		17,113		2,811		—		120,027
Total	$	3,642,438	$	647,509	$	82,136	$	28,149	$	—	$	4,400,232	$	3,851,837	$	758,681	$	88,588	$	22,859	$	30	$	4,721,995

The allowance for loan losses (“ALL”) methodology is disclosed in Note (5) to the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2016.~~2017.

The following table details activity in the ALL by class of 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.

	ALL															ALL
	Balance at beginning of period		Charge- offs			Recoveries		Net charge-offs			Provisions charged to operations			Balance at end of period		Balance at beginning of period		Charge- offs			Recoveries		Net charge-offs			Provisions charged to operations			Balance at end of period
	(Dollars in thousands)															(Dollars in thousands)
Three Months Ended March 31, 2017
Three Months Ended March 31, 2018
Real estate:
Non-residential real estate owner occupied	$	5,602	$	(32	)	$	1	$	(31	)	$	(9	)	$	5,562	$	6,195	$	(19	)	$	1	$	(18	)	$	473		$	6,650
Non-residential real estate other		10,793		(1	)		1		—			(5	)		10,788		10,519		(1	)		39		38			(9	)		10,548
Residential real estate permanent mortgage		3,129		(120	)		1		(119	)		120			3,130		3,226		(56	)		3		(53	)		108			3,281
Residential real estate all other		8,622		(57	)		11		(46	)		83			8,659		9,672		(90	)		3		(87	)		246			9,831
Commercial and financial:
Non-consumer non-real estate		12,421		(206	)		918		712			(323	)		12,810		15,334		(156	)		13		(143	)		(406	)		14,785
Consumer non-real estate		2,804		(234	)		51		(183	)		104			2,725		2,793		(250	)		80		(170	)		76			2,699
Other loans		4,045		(1,218	)		4		(1,214	)		127			2,958		2,481		—			12		12			(157	)		2,336
Acquired loans		1,277		(13	)		50		37			(25	)		1,289		1,446		(27	)		18		(9	)		(17	)		1,420
Total	$	48,693	$	(1,881	)	$	1,037	$	(844	)	$	72		$	47,921	$	51,666	$	(599	)	$	169	$	(430	)	$	314		$	51,550

	ALL														ALL
	Balance at beginning of period		Charge- offs			Recoveries		Net charge-offs			Provisions charged to operations		Balance at end of period		Balance at beginning of period		Charge- offs			Recoveries		Net charge-offs			Provisions charged to operations			Balance at end of period
	(Dollars in thousands)														(Dollars in thousands)
Three Months Ended March 31, 2016
Three Months Ended March 31, 2017
Real estate:
Non-residential real estate owner occupied	$	4,661	$	(1	)	$	—	$	(1	)	$	172	$	4,832	$	5,602	$	(32	)	$	1	$	(31	)	$	(9	)	$	5,562
Non-residential real estate other		9,921		(1	)		1		—			290		10,211		10,793		(1	)		1		—			(5	)		10,788
Residential real estate permanent mortgage		3,148		(50	)		17		(33	)		49		3,164		3,129		(120	)		1		(119	)		120			3,130
Residential real estate all other		6,725		(67	)		4		(63	)		1,327		7,989		8,622		(57	)		11		(46	)		83			8,659
Commercial and financial:
Non-consumer non-real estate		11,754		(803	)		11		(792	)		1,851		12,813		12,421		(206	)		918		712			(323	)		12,810
Consumer non-real estate		2,642		(221	)		38		(183	)		94		2,553		2,804		(234	)		51		(183	)		104			2,725
Other loans		2,648		(133	)		6		(127	)		269		2,790		4,045		(1,218	)		4		(1,214	)		127			2,958
Acquired loans		167		(4	)		5		1			51		219		1,277		(13	)		50		37			(25	)		1,289
Total	$	41,666	$	(1,280	)	$	82	$	(1,198	)	$	4,103	$	44,571	$	48,693	$	(1,881	)	$	1,037	$	(844	)	$	72		$	47,921

The following table details the amount of ALL by class of loans for the period presented, detailed on the basis of the impairment methodology used by the Company.

	ALL								ALL
	March 31, 2017				December 31, 2016				March 31, 2018				December 31, 2017

	Individually evaluated for impairment		Collectively evaluated for impairment		Individually evaluated for impairment		Collectively evaluated for impairment		Individually evaluated for impairment		Collectively evaluated for impairment		Individually evaluated for impairment		Collectively evaluated for impairment
	(Dollars in thousands)								(Dollars in thousands)
Real estate:
Non-residential real estate owner occupied.	$	614	$	4,948	$	716	$	4,886	$	820	$	5,830	$	656	$	5,539
Non-residential real estate other		1,011		9,777		1,119		9,674		874		9,674		751		9,768
Residential real estate permanent mortgage		433		2,697		422		2,707		540		2,741		483		2,743
Residential real estate all other		2,275		6,384		2,160		6,462		2,971		6,860		2,761		6,911
Commercial and financial:
Non-consumer non-real estate		3,517		9,293		3,317		9,104		4,257		10,528		4,651		10,683
Consumer non-real estate		459		2,266		478		2,326		361		2,338		429		2,364
Other loans		658		2,300		1,812		2,233		66		2,270		133		2,348
Acquired loans		10		1,279		495		782		—		1,420		12		1,434
Total	$	8,977	$	38,944	$	10,519	$	38,174	$	9,889	$	41,661	$	9,876	$	41,790

The following table details the loans outstanding by class of loans for the period presented, on the basis of the impairment methodology used by the Company.

	Loans												Loans
	March 31, 2017						December 31, 2016						March 31, 2018						December 31, 2017
	Individually evaluated for impairment		Collectively evaluated for impairment		Loans acquired with deteriorated credit quality		Individually evaluated for impairment		Collectively evaluated for impairment		Loans acquired with deteriorated credit quality		Individually evaluated for impairment		Collectively evaluated for impairment		Loans acquired with deteriorated credit quality		Individually evaluated for impairment		Collectively evaluated for impairment		Loans acquired with deteriorated credit quality
	(Dollars in thousands)												(Dollars in thousands)
Real estate:
Non-residential real estate owner occupied	$	15,363	$	561,350	$	—	$	17,149	$	554,482	$	—	$	19,875	$	652,709	$	—	$	15,281	$	626,337	$	—
Non-residential real estate other		17,125		1,110,202		—		20,092		1,103,304		—		17,926		1,095,093		—		17,013		1,109,578		—
Residential real estate permanent mortgage		7,750		315,977		—		7,631		317,782		—		9,640		321,410		—		8,100		322,234		—
Residential real estate all other		16,719		722,315		—		14,873		733,356		—		15,262		763,018		—		15,052		770,603		—
Commercial and financial:
Non-consumer non-real estate		25,189		1,034,131		—		24,002		1,027,183		—		29,378		1,227,334		—		31,349		1,253,056		—
Consumer non-real estate		3,068		272,990		—		3,203		280,674		—		2,838		281,922		—		2,600		286,320		—
Other loans		2,338		140,195		—		2,254		139,228		—		198		138,479		—		764		143,681		—
Acquired loans		13,651		126,630		5,782		13,459		135,616		5,944		39,207		362,338		7,857		14,464		100,106		5,457
Total	$	101,203	$	4,283,790	$	5,782	$	102,663	$	4,291,625	$	5,944	$	134,324	$	4,842,303	$	7,857	$	104,623	$	4,611,915	$	5,457

Transfers from loans 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 to other real estate owned and repossessed assets during the periods presented, are summarized as follows:

	Three Months Ended March 31,				Three Months Ended March 31,
	2017		2016		2018		2017
	(Dollars in thousands)				(Dollars in thousands)
Other real estate owned	$	901	$	344	$	402	$	901
Repossessed assets		363		404		220		363
Total	$	1,264	$	748	$	622	$	1,264

During the quarter ended March 31, 2016, the Company had gains on the sale of other real estate owned totaling $1.2 million that is included in net expense from other real estate owned on the consolidated statements of comprehensive income.

	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(Dollars in thousands)							(Dollars in thousands)
As of March 31, 2017
As of March 31, 2018
Core deposit intangibles	$	17,447	$	(7,071	)	$	10,376	$	25,907	$	(9,098	)	$	16,809
Customer relationship intangibles		5,699		(3,506	)		2,193		5,699		(3,854	)		1,845
Mortgage servicing intangibles		465		(266	)		199		419		(291	)		128
Total	$	23,611	$	(10,843	)	$	12,768	$	32,025	$	(13,243	)	$	18,782
As of December 31, 2016
As of December 31, 2017
Core deposit intangibles	$	17,447	$	(6,611	)	$	10,836	$	17,447	$	(8,451	)	$	8,996
Customer relationship intangibles		5,699		(3,419	)		2,280		5,699		(3,767	)		1,932
Mortgage servicing intangibles		473		(259	)		214		439		(285	)		154
Total	$	23,619	$	(10,289	)	$	13,330	$	23,585	$	(12,503	)	$	11,082

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, ~~2016.~~2017.

The Company adopted a nonqualified incentive stock option plan (the “BancFirst ISOP”) in May 1986. The Company has amended the BancFirst ISOP since 1986 to increase the number of shares to be issued under the plan to ~~3,200,000 shares in May 2016.~~6,400,000 shares. At March 31, ~~2017, 215,735~~2018, there were 309,970 shares ~~were~~ available for future grants. The BancFirst ISOP will terminate on December 31, ~~2019.~~2019, 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 at the end of fifteen years from the date of grant. Options outstanding as of March 31, ~~2017~~2018 will become exercisable through the year ~~2023.~~2025. 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.

In June 1999, the Company adopted the BancFirst Corporation Non-Employee Directors’ Stock Option Plan (the “BancFirst Directors’ Stock Option Plan”). Each non-employee director is granted an option for 10,000 shares. The Company has amended the BancFirst Directors’ Stock Option Plan since 1999 to increase the number of shares to be issued under the plan to ~~260,000 shares in May 2016.~~520,000 shares. At March 31, ~~2017, 40,000~~2018, there were 50,000 shares ~~were~~ available for future grants. The BancFirst Directors’ Stock Option Plan will terminate on December 31, 2019, 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 at the end of fifteen years from the date of grant. Options outstanding as of March 31, ~~2017~~2018 will become exercisable through the year ~~2020.~~2022. 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:

The following table has additional information regarding options granted and options exercised under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan:

	Three Months Ended March 31,				Three Months Ended March 31,
	2017		2016		2018		2017
	(Dollars in thousands except per share data)				(Dollars in thousands except per share data)
Weighted average grant-date fair value per share of options granted	$	—	$	11.47	$	13.98	$	—
Total intrinsic value of options exercised		4,613		779		2,860		4,613
Cash received from options exercised		2,610		875		1,233		2,610
Tax benefit realized from options exercised		1,784		301		729		1,784

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 March 31,				Three Months Ended March 31,
	2017		2016		2018		2017
	(Dollars in thousands)				(Dollars in thousands)
Stock-based compensation expense	$	222	$	451	$	306	$	222
Tax benefit		71		174		78		71
Stock-based compensation expense, net of tax	$	151	$	277	$	228	$	151

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:

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:

	Three Months Ended March 31,			Three Months Ended March 31,
	2017		2016	2018	2017
Risk-free interest rate		—	1.91 to 2.02%	2.55 to 2.92%		—
Dividend yield		—	2.00%	2.00%		—
Stock price volatility		—	20.41 to 20.64%	23.05 to 23.18%		—
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.

In May 1999, the Company adopted the BancFirst Corporation Directors’ Deferred Stock Compensation Plan (the “BancFirst Deferred Stock Compensation Plan”). The Company has amended the BancFirst Deferred Stock Compensation Plan since 1999 to increase the number of shares to be issued under the plan to ~~91,110 shares in May 2014.~~222,220 shares. The BancFirst Deferred Stock Compensation Plan will terminate on December 31, 2019, 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 ~~3,891~~2,842 and 7,782 shares of common stock distributed from the BancFirst Deferred Stock Compensation Plan during the three months ended March 31, ~~2017.~~2018 and March 31, 2017, respectively.

	March 31,		December 31,		March 31,		December 31,
	2017		2016		2018		2017
Accumulated stock units		67,230		70,022		137,889		138,768
Average price	$	42.87	$	41.74	$	23.34	$	22.84

In November 1999, the Company adopted a Stock Repurchase Program (the “SRP”). The SRP may be used as a means to increase earnings per share and return on equity, to purchase treasury stock for the exercise of stock options or for distributions under the Deferred Stock Compensation Plan, to provide liquidity for optionees to dispose of stock from exercises of their stock options, and

to provide liquidity for stockholders wishing to sell their stock. All shares repurchased under the SRP have been retired and not held as treasury stock. The timing, price and amount of stock repurchases under the SRP may be determined by management ~~within~~and approved by the ~~limitations of the SRP. During the third quarter of 2016 the SRP was amended to increase the remaining shares to be repurchased to 150,000.~~Company’s Executive Committee.

	Three Months Ended March 31,				Three Months Ended March 31,
	2017		2016		2018		2017
Number of shares repurchased		—		100,000		—		—
Average price of shares repurchased	$	—	$	55.23	$	—	$	—
Shares remaining to be repurchased		150,000		66,276		300,000		300,000

The Company and BancFirst 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 and BancFirst’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 March 31, ~~2017,~~2018, the Company and BancFirst 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							Required							To Be Well
					For Capital				With				Capitalized Under							For Capital				With			Capitalized Under
					Adequacy				Capital Conservation				Prompt Corrective							Adequacy				Capital Conservation			Prompt Corrective
	Actual				Purposes				Buffer				Action Provisions				Actual			Purposes				Buffer			Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio	Amount		Ratio		Amount		Ratio	Amount		Ratio
	(Dollars in thousands)																(Dollars in thousands)
As of March 31, 2017:
As of March 31, 2018:
Total Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	743,955		15.72%	$	378,690		8.00%	$	437,861		9.250%	N/A		N/A		$	825,088	15.48%	$	426,422		8.00%	$	526,365	9.875%	N/A		N/A
BancFirst		668,329		14.14%		378,252		8.00%		437,354		9.250%	$	472,815		10.00%		708,338	13.46%		420,910		8.00%		519,560	9.875%	$	526,137		10.00%
Common Equity Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	665,034		14.05%	$	213,013		4.50%	$	272,184		5.750%	N/A		N/A		$	742,538	13.93%	$	239,862		4.50%	$	339,805	6.375%	N/A		N/A
BancFirst		600,408		12.70%		212,767		4.50%		271,869		5.750%	$	307,330		6.50%		636,775	12.10%		236,762		4.50%		335,412	6.375%	$	341,989		6.50%
Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	696,034		14.70%	$	284,018		6.00%	$	343,188		7.250%	N/A		N/A		$	773,538	14.51%	$	319,816		6.00%	$	419,759	7.875%	N/A		N/A
BancFirst		620,408		13.12%		283,689		6.00%		342,791		7.250%	$	378,252		8.00%		656,775	12.48%		315,682		6.00%		414,333	7.875%	$	420,910		8.00%
Tier 1 Capital
(to Total Assets)-
BancFirst Corporation	$	696,034		9.95%	$	279,674		4.00%	N/A		N/A		N/A		N/A		$	773,538	10.43%	$	296,653		4.00%	N/A		N/A	N/A		N/A
BancFirst		620,408		8.88%		279,412		4.00%	N/A		N/A		$	349,266		5.00%		656,775	8.96%		293,061		4.00%	N/A		N/A	$	366,327		5.00%

As of March 31, ~~2017,~~2018, the most recent notification from the Federal Reserve Bank of Kansas City and the FDIC categorized BancFirst as “well capitalized” under the regulatory framework from prompt corrective action. 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 notifications of BancFirst’s capital category that management believes would materially change its category under capital requirements existing as of the report date.

Under the Basel III Capital Rules, in order to avoid limitations on capital distributions, including dividend payments and certain discretionary bonus payments to executive officers, a banking organization must hold a capital conservation buffer composed of CET1 capital above its minimum risk-based capital requirements. The implementation of the capital conservation buffer began on January 1, 2016 at the 0.625% level and will be phased in over a four-year period (increasing by that amount on each subsequent January 1, until it reaches 2.5% on January 1, 2019). Management believes that, as of March 31, ~~2017,~~2018, the Company and BancFirst would meet all capital adequacy requirements under the Basel III Capital Rules on a fully phased-in basis as if such requirements were currently in effect.

Basic and diluted net income per common share based on weighted-average shares outstanding are calculated as follows:

	Income (Numerator)		Shares (Denominator)		Per Share Amount		Income (Numerator)		Shares (Denominator)		Per Share Amount
	(Dollars in thousands, except per share data)						(Dollars in thousands, except per share data)
Three Months Ended March 31, 2018
Basic
Income available to common stockholders							$	29,620		32,574,251	$	0.91
Dilutive effect of stock options								—		743,493
Diluted
Income available to common stockholders plus assumed exercises of stock options							$	29,620		33,317,744	$	0.89
Three Months Ended March 31, 2017
Basic
Income available to common stockholders	$	22,050		15,864,807	$	1.39	$	22,050		31,729,614	$	0.70
Dilutive effect of stock options		—		373,191				—		746,382
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	22,050		16,237,998	$	1.36	$	22,050		32,475,996	$	0.68
Three Months Ended March 31, 2016
Basic
Income available to common stockholders	$	16,579		15,534,416	$	1.07
Dilutive effect of stock options		—		281,955
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	16,579		15,816,371	$	1.05

The following table shows the number ~~and average exercise price~~ of options that were excluded from the computation of diluted net income per common share for each period because the options’ exercise prices were greater than the average market price of the common shares:

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 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:

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 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 and equity securities classified as available for sale 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.

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.

Derivatives are reported at fair value utilizing Level 2 inputs. The Company obtains dealer and market quotations to value its oil and gas swaps and options. The Company utilizes dealer quotes and observable market data inputs to substantiate internal valuation models.

The 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.

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		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
	(Dollars in thousands)								(Dollars in thousands)
March 31, 2017
March 31, 2018
Securities available for sale:
U.S. Treasury	$	289,433	$	—	$	—	$	289,433	$	341,249	$	—	$	—	$	341,249
U.S. federal agencies		—		105,058		—		105,058		—		85,900		—		85,900
Mortgage-backed securities		—		4,464		14,609		19,073		—		3,218		14,467		17,685
States and political subdivisions		—		39,638		—		39,638		—		39,923		—		39,923
Other securities		—		—		6,045		6,045		—		—		6,265		6,265
Derivative assets		—		528		—		528		—		331		—		331
Derivative liabilities		—		329		—		329		—		287		—		287
Loans held for sale		—		7,754		—		7,754		—		6,197		—		6,197

December 31, 2016
December 31, 2017
Securities available for sale:
U.S. Treasury	$	268,543	$	—	$	—	$	268,543	$	312,802	$	—	$	—	$	312,802
U.S. federal agencies		—		129,642		—		129,642		—		88,851		—		88,851
Mortgage-backed securities		—		4,856		14,816		19,672		—		3,509		14,467		17,976
States and political subdivisions		—		41,042		—		41,042		—		42,370		—		42,370
Other securities		—		—		6,569		6,569		—		—		5,704		5,704
Derivative assets		—		1,569		—		1,569		—		295		—		295
Derivative liabilities		—		1,306		—		1,306		—		261		—		261
Loans held for sale		—		9,318		—		9,318		—		6,173		—		6,173

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

	Three Months Ended March 31,			Twelve Months Ended December 31,			Three Months Ended March 31,			Twelve Months Ended December 31,
	2017			2016			2018			2017
	(Dollars in thousands)						(Dollars in thousands)
Balance at the beginning of the year	$	21,385		$	21,124		$	20,171		$	21,385
Purchases		157			1,096			874			1,668
Settlements		(212	)		(191	)		(313	)		(722	)
Sales		—			(429	)		—			(5,412	)
Losses included in earnings		—			(111	)
Gains included in earnings								—			4,060
Total unrealized losses		(676	)		(104	)		—			(808	)
Balance at the end of the period	$	20,654		$	21,385		$	20,732		$	20,171

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 three months ended March 31, ~~2017~~2018 and ~~2016,~~2017, 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.

Impaired loans are reported at the fair value of the underlying collateral if repayment is dependent on liquidation of the collateral. In no case does the fair value of an impaired loan exceed the fair value of the underlying collateral. The impaired loans are adjusted to fair value through a specific allocation of the allowance for loan 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 loan 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		Total Fair Value
	Level 3		Level 3
	(Dollars in thousands)		(Dollars in thousands)
As of and for the Year-to-date Period Ended March 31, 2017
As of and for the Year-to-date Period Ended March 31, 2018
Impaired loans (less specific allowance)	$	23,609	$	42,278
Repossessed assets		266		151
Other real estate owned		776		750

As of and for the Year-to-date Period Ended December 31, 2016
As of and for the Year-to-date Period Ended December 31, 2017
Impaired loans (less specific allowance)	$	29,912	$	34,041
Repossessed assets		340		288
Other real estate owned		1,480		1,995

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, Federal Funds Sold and Interest-Bearing Deposits

The carrying amount of these short-term instruments is a reasonable estimate of fair value.

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.

To determine the fair value of loans, the Company uses an exit price calculation, which takes into account factors such as liquidity, credit and the nonperformance risk of loans. For certain homogeneous categories of loans, such as some residential mortgages, fair values are estimated using the quoted market prices for securities backed by similar loans, adjusted for differences in loan characteristics. The fair values of other types of loans are estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities.

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.

The amounts payable on these short-term instruments are reasonable estimates of fair value.

The fair values of junior subordinated debentures are estimated using the rates that would be charged for junior subordinated debentures of similar remaining maturities.

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:

	March 31,				December 31,				March 31,				December 31,
	2017				2016				2018				2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Dollars in thousands)								(Dollars in thousands)
FINANCIAL ASSETS
Level 2 inputs:
Cash and cash equivalents	$	2,038,212	$	2,038,212	$	1,851,161	$	1,851,161	$	1,793,200	$	1,793,200	$	1,758,575	$	1,758,575
Securities held for investment		3,503		3,538		3,722		3,760		1,579		1,586		1,792		1,803
Level 3 inputs:
Securities held for investment		500		500		643		643		500		500		500		500
Loans, net of allowance for loan losses		4,342,854		4,358,648		4,351,539		4,367,363		4,932,934		4,910,027		4,670,329		4,663,608
FINANCIAL LIABILITIES
Level 2 inputs:
Deposits		6,394,627		6,462,059		6,248,057		6,313,622		6,713,052		6,811,967		6,415,045		6,490,309
Short-term borrowings		800		800		500		500		100		100		900		900
Junior subordinated debentures		31,959		36,248		31,959		34,339		31,959		35,548		31,959		34,661
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments				1,749				1,718				1,791				1,839
Letters of credit				430				424				483				428

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 (excluding mortgage service rights, which are valued ~~semi-annually)~~periodically) 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 March 31, ~~2017~~2018 or December 31, ~~2016.~~2017.

The Company enters into oil and gas swaps and options contracts to accommodate the business needs of its customers. Upon the origination of an oil or gas swap or option contract with a customer, the Company simultaneously enters into an offsetting contract with a counterparty to mitigate the exposure to fluctuations in oil and gas prices. These derivatives are not designated as hedged instruments and are recorded on the Company’s consolidated balance sheet at fair value.

(10)The Company utilizes dealer quotations and observable market data inputs to substantiate internal valuation models. The notional amounts and estimated fair values of oil and gas derivative positions outstanding are presented in the following table:SEGMENT INFORMATION

~~The following table is a summary of the Company’s recognized income related to the activity, which was included in other noninterest income:~~

The Company’s credit exposure on oil and gas swaps and options varies based on the current market prices of oil and natural gas. Other than credit risk, changes in the fair value of customer positions will be offset by equal and opposite changes in the counterparty positions. The net positive fair value of the contracts is the profit derived from the activity and is unaffected by market price movements. The Company’s share of total profit is approximately 35%.

Customer credit exposure is managed by strict position limits and is primarily offset by first liens on production while the remainder is offset by cash. Counterparty credit exposure is managed by selecting highly rated counterparties (rated A- or better by Standard and Poor’s) and monitoring market information.

~~The following table is a summary of the Company’s net credit exposure relating to oil and gas swaps and options with bank counterparties:~~

Derivatives may be eligible for offset in the consolidated balance sheet and/or subject to master netting arrangements. The Company’s derivative transactions with upstream financial institution counterparties and bank customers are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements which include “right of set-off” provisions. In such cases there is generally a legally enforceable right to offset recognized amounts and there may be an intention to settle such amounts on a net basis. Nonetheless, the Company does not generally offset such financial instruments for financial reporting purposes.

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 four principal business units are metropolitan banks, community banks, other financial services and executive, operations and support. Metropolitan and community banks 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. 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		Other Financial Services		Executive, Operations & Support			Eliminations			Consolidated		Metropolitan Banks		Community Banks		Other Financial Services		Executive, Operations & Support			Eliminations			Consolidated
															(Dollars in thousands)
Three Months Ended March 31, 2018
Net interest income (expense)															$	20,304	$	41,382	$	1,475	$	(126	)	$	—		$	63,035
Noninterest income																3,941		13,953		9,624		32,194			(29,602	)		30,110
Income before taxes																14,736		26,348		5,043		19,915			(29,101	)		36,941
	(Dollars in thousands)
Three Months Ended March 31, 2017
Net interest income (expense)	$	18,520	$	35,123	$	1,495	$	(370	)	$	—		$	54,768	$	18,520	$	35,123	$	1,495	$	(370	)	$	—		$	54,768
Noninterest income		3,822		13,277		8,310		24,472			(21,796	)		28,085		3,822		13,277		8,310		24,472			(21,796	)		28,085
Income before taxes		13,074		22,719		3,645		15,511			(21,756	)		33,193		13,074		22,719		3,645		15,511			(21,756	)		33,193

Three Months Ended March 31, 2016
Net interest income (expense)	$	15,843	$	33,122	$	1,416	$	(405	)	$	—		$	49,976
Noninterest income		3,788		13,596		7,479		17,678			(16,924	)		25,617
Income before taxes		9,348		19,094		3,114		10,500			(16,857	)		25,199

Total Assets:
March 31, 2017	$	2,569,703	$	4,481,943	$	75,587	$	854,316		$	(791,912	)	$	7,189,637
December 31, 2016		2,493,096		4,412,174		83,594		803,810			(773,722	)		7,018,952
March 31, 2018															$	2,646,469	$	4,952,580	$	84,625	$	838,976		$	(907,008	)	$	7,615,642
December 31, 2017																2,552,024		4,544,196		117,332		885,590			(845,986	)		7,253,156

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.

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

The following discussion and analysis presents factors that the Company believes are relevant to an assessment and understanding of the Company’s consolidated financial position and results of operations. This discussion and analysis should be read in conjunction with the Company’s December 31, ~~2016~~2017 consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2016~~2017 and the Company’s consolidated financial statements and the related Notes included in Item 1.

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

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

BancFirst Corporation’s net income for the first quarter of ~~2017~~2018 was ~~$22.1~~$29.6 million, compared to ~~$16.6~~$22.1 million for the first quarter of ~~2016.~~2017. Diluted net income per common share was ~~$1.36~~$0.89 and ~~$1.05~~$0.68 for the first quarter of 2018 and 2017, ~~and 2016,~~ respectively. On January 11, 2018 the Company completed the acquisitions of two Oklahoma banking corporations. Consequently, the first quarter of 2018 included one-time acquisition related expenses of approximately $2.1 million, which reduced diluted earnings per share by approximately 5 cents. Net income for the first quarter of 2017 included the effects of favorable resolutions of two problem loans which resulted in principal recovery of $894,000 and unaccrued interest income of $2.3 million.

The Company’s net interest income for the first quarter of ~~2017~~2018 increased to ~~$54.8~~$63.0 million, compared to ~~$50.0~~$54.8 million for the first quarter of ~~2016.~~2017. The net interest margin for the quarter was ~~3.39%~~3.66%, compared to ~~3.25%~~3.39% a year ago. The increase in margin was primarily due to the ~~previously mentioned interest of $2.3 million, which added approximately 0.14% to the margin, and increases~~increase in the federal funds ~~rate.~~rate throughout 2017 and the first quarter of 2018 and the two acquisitions. The Company’s provision for loan losses for the first quarter of ~~2017 decreased~~2018 was $314,000, compared to $72,000 ~~compared to $4.1 million~~ a year ago. ~~The decrease in the provision was due in part to the resolution of the above-mentioned problem loans and an unusually high provision for a few commercial loans in the prior year.~~ Net charge-offs for the quarter were only ~~0.02%~~0.01% of average loans, compared to ~~0.03%~~0.02% for the first quarter of ~~2016.~~2017. Noninterest income for the quarter totaled ~~$28.1~~$30.1 million, compared to ~~$25.6~~$28.1 million last year. Noninterest expense for the quarter totaled ~~$49.6~~$55.9 million, compared to ~~$46.3~~$49.6 million last year. The increase in noninterest expenses was due to salary increases in ~~2017~~2018 and ~~$1.2 million in gains on~~ the ~~sale of other real estate owned that reduced expenses in 2016.~~two acquisitions. The Company’s effective tax rate was ~~33.6%~~19.8% compared to ~~34.2%~~33.6% for the first quarter of ~~2016.~~2017 and added approximately 15 cents to the first quarter diluted earnings per share. The decrease in the effective tax rate was ~~primarily~~ due to ~~Accounting Standards Update 2016-09, which is a~~ change in ~~accounting standards related to~~tax rates from the Tax Cuts and Jobs Act and exercising of stock ~~based compensation.~~options during the quarter.

At March 31, ~~2017,~~2018, the Company’s total assets were ~~$7.2~~$7.6 billion, an increase of ~~$170.7~~$362.5 million from December 31, ~~2016.~~2017. The increase in total assets was primarily related to acquisitions during the quarter. Securities of ~~$463.3~~$493.1 million ~~and loans of $4.4 billion~~ were ~~both down~~up slightly from December 31, ~~2016. Deposits~~2017. Loans totaled ~~$6.4~~$5.0 billion, an increase of ~~$146.6~~$262.5 million from December 31, 2017. Excluding acquired loans of $312.3 million, loans were slightly down from December 31, 2017. Deposits totaled $6.7 billion, an increase of $298.0 million from the December 31, ~~2016 total.~~2017 total, which was primarily related to the acquisitions. The Company’s total stockholders’ equity was ~~$729.9~~$838.1 million, an increase of ~~$18.8~~$62.5 million over December 31, ~~2016.~~2017.

Asset quality remained strong during the first quarter of ~~2017.~~2018. Nonperforming and restructured assets ~~fell to 0.45%~~were 0.69% of total assets at March 31, ~~2017~~2018 compared to ~~0.56%~~0.61% at December 31, ~~2016. The decrease in nonperforming and restructured assets was largely due to the resolution of the aforementioned two problem loans during the first quarter of~~ 2017. The allowance to total loans was ~~1.09%~~1.03%, compared to ~~1.10%~~1.09% at year-end ~~2016.~~2017. The allowance to nonperforming and restructured loans was ~~171.6%~~105.9% compared to ~~137.3%~~130.6% at year-end ~~2016.~~2017.

On January 11, 2018, the Company completed the previously announced acquisitions of two Oklahoma banking corporations. First Wagoner Corporation and its subsidiary bank, First Bank & Trust Company, and First Chandler Corp. and its subsidiary bank, First Bank of Chandler, had combined total assets of approximately $378 million. The Company exchanged a combination of cash and stock for these transactions.

See Note (1) of the Notes to Consolidated Financial Statements for a discussion of recently issued accounting pronouncements.

See Note (10) of the Notes to Consolidated Financial Statements for disclosures regarding business segments.

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

	Three Months Ended March 31,						Three Months Ended March 31,
	2017			2016			2018			2017
Income Statement Data
Net interest income	$	54,768		$	49,976		$	63,035		$	54,768
Provision for loan losses		72			4,103			314			72
Securities transactions		—			100			(14	)		—
Total noninterest income		28,085			25,617			30,110			28,085
Salaries and employee benefits		30,654			29,357			34,190			30,654
Total noninterest expense		49,588			46,291			55,890			49,588
Net income		22,050			16,579			29,620			22,050
Per Common Share Data
Net income – basic	$	1.39		$	1.07		$	0.91		$	0.70
Net income – diluted		1.36			1.05			0.89			0.68
Cash dividends		0.38			0.36			0.21			0.19
Performance Data
Return on average assets		1.27	%		1.00	%		1.60	%		1.27	%
Return on average stockholders’ equity		12.37			10.05			14.60			12.37
Cash dividend payout ratio		27.34			33.73			23.08			27.34
Net interest spread		3.19			3.09			3.34			3.19
Net interest margin		3.39			3.25			3.66			3.39
Efficiency ratio		59.85			61.24			60.00			59.85
Net charge-offs to average loans		0.02			0.03			0.01			0.02

For the three months ended March 31, ~~2017,~~2018, net interest income, which is the Company’s principal source of operating revenue, increased to ~~$54.8~~$63.0 million compared to ~~$50.0~~$54.8 million for the three months ended March 31, ~~2016.~~2017. Net interest margin is the ratio of taxable-equivalent net interest income to average earning assets for the period. The Company’s net interest margin for the quarter was ~~3.39%~~3.66% compared to ~~3.25%~~3.39% a year ago. The increase in the margin was primarily due to ~~interest income of $2.3 million related to the favorable resolution of two problem loans, which added approximately 0.14% to the margin, and~~ the increase in the federal funds rate ~~of 25 basis points during~~throughout 2017 and the ~~fourth~~first quarter of ~~2016.~~2018 and the two acquisitions.

The Company’s provision for loan loss for the first quarter of ~~2017 decreased~~2018 was $314,000 compared to $72,000 ~~compared to $4.1 million~~ a year ago. ~~The decrease in the provision was due in part to the resolution of two problem loans and an unusually high provision for a few commercial loans in the prior year.~~ The Company establishes an allowance as an estimate of the probable inherent losses in the loan portfolio at the balance sheet date. Management believes the allowance for loan losses is appropriate based upon management’s best estimate of probable losses that have been incurred within the existing loan portfolio. Should any of the factors considered by management in evaluating the appropriate level of the allowance for loan losses change, the Company’s estimate of probable loan losses could also change, which could affect the amount of future provisions for loan losses. Net loan charge-offs were $430,000 for the first quarter of 2018, compared to $844,000 for the first quarter of ~~2017, compared to $1.2 million for the first quarter of 2016.~~2017. The rate of net charge-offs to average total loans, as presented in the preceding table, continues to be at a very low level.

Noninterest income totaled $30.1 million for the first quarter of 2018 compared to $28.1 million for the first quarter of ~~2017 compared to $25.6 million for the first quarter of 2016.~~2017. Noninterest income included increases in trust revenue, insurance commissions, debit card usage fees and non-sufficient funds fees. The Company had fees from debit card usage totaling ~~$6.2~~$6.8 million and ~~$5.9~~$6.2 million during the three month periods ended March 31, ~~2017~~2018 and ~~2016,~~2017, respectively. This represents ~~22.2%~~22.7% and ~~23.1% of the Company’s noninterest income for the three month periods~~

ended March 31, 2017 and 2016, respectively. In addition, the Company has non-sufficient funds fees totaling $6.9 million and $6.1 million for the three month periods ended March 31, 2017 and 2016, respectively. This represents 24.4% and 24.0%22.2% of the Company’s noninterest income for the three month periods ended March 31, 2018 and 2017, respectively. In addition, the Company has non-sufficient funds fees totaling $7.2 million and ~~2016,~~$6.9

million for the three month periods ended March 31, 2018 and 2017, respectively. This represents 24.0% and 24.4% of the Company’s noninterest income for the three month periods ended March 31, 2018 and 2017, respectively.

For the three months ended March 31, ~~2017,~~2018, noninterest expense totaled ~~$49.6~~$55.9 million, compared to ~~$46.3~~$49.6 million for the three months ended March 31, ~~2016.~~2017. The increase in noninterest expense for the first quarter of ~~2017~~2018 was ~~primarily~~ due to salary increases in 2018 and ~~$1.2 million in gains on sale~~the two acquisitions which included one-time acquisition related expenses of ~~other real estate owned that reduced expenses in 2016.~~approximately $2.1 million.

The Company’s effective tax rate on income before taxes was 19.8% for the first quarter of 2018, compared to 33.6% for the first quarter of ~~2017, compared to 34.2% for the first quarter of 2016.~~2017. The decrease in the effective tax rate was ~~primarily~~ due to ~~Accounting Standards Update 2016-09, which is a~~the change in ~~accounting standards related to~~tax rates from the Tax Cuts and Jobs Act and exercising of stock ~~based compensation.~~options during the quarter.

	March 31,			December 31,			March 31,			December 31,
	2017			2016			2018			2017
	(unaudited)						(unaudited)
Balance Sheet Data
Total assets	$	7,189,637		$	7,018,952		$	7,615,642		$	7,253,156
Total loans (net of unearned interest)		4,398,529			4,409,550			4,990,681			4,728,168
Allowance for loan losses		47,921			48,693			51,550			51,666
Securities		463,250			469,833			493,101			469,995
Deposits		6,394,627			6,248,057			6,713,052			6,415,045
Stockholders' equity		729,873			711,094			838,096			775,629
Book value per share		45.93			44.97			25.62			24.32
Tangible book value per share		41.72			40.71
Tangible book value per share (non-GAAP)(1)								22.61			22.28
Average loans to deposits (year-to-date)		70.13	%		71.44	%		75.42	%		72.22	%
Average earning assets to total assets (year-to-date)		93.45			93.10			93.14			93.41
Average stockholders’ equity to average assets (year-to-date)		10.25			10.11			10.95			10.56
Asset Quality Ratios
Nonperforming and restructured loans to total loans		0.63	%		0.80	%		0.98	%		0.84	%
Nonperforming and restructured assets to total assets		0.45			0.56			0.69			0.61
Allowance for loan losses to total loans		1.09			1.10			1.03			1.09
Allowance for loan losses to nonperforming and restructured loans		171.63			137.27			105.87			130.62
Reconciliation of Tangible Book Value per Common Share (non-GAAP)(2)
Stockholders' equity							$	838,096		$	775,629
Less goodwill								79,796			54,042
Less intangible assets, net								18,782			11,082
Tangible stockholders' equity (non-GAAP)							$	739,518		$	710,505
Common shares outstanding								32,707,166			31,894,563
Tangible book value per share (non-GAAP)							$	22.61		$	22.28

The aggregate of cash and due from banks, interest-bearing deposits with banks and federal funds sold increased ~~$187.1~~slightly by $34.6 million or ~~10.1%~~2.0% to ~~$2.0~~$1.8 billion, from December 31, ~~2016~~2017 to March 31, ~~2017. This increase was due primarily to the increase in deposits.~~2018.

At March 31, ~~2017,~~2018, total securities ~~decreased $6.6~~increased $23.1 million, or ~~1.4%~~4.9% compared to December 31, ~~2016.~~2017. The size of the Company’s securities portfolio is determined by the Company’s liquidity and asset/liability management. The net unrealized loss on securities available for sale, before taxes, was ~~$138,000~~$5.0 million at March 31, ~~2017,~~2018, compared to ~~an unrealized gain of $153,000~~$3.1 million at December 31, ~~2016.~~2017. These unrealized ~~(losses)/gains~~losses are included in the Company’s stockholders’ equity as accumulated other comprehensive income, net of income tax, in the amounts of ($~~84,000)~~3.7) and ~~$94,000,~~($2.3) million, respectively.

At March 31, ~~2017,~~2018, loans totaled ~~$4.4~~$5.0 billion, ~~down slightly~~an increase of $262.5 million from December 31, ~~2016.~~2017. Excluding acquired loans of approximately $312.3 million, loans were slightly down from December 31, 2017. The slight decrease in loans was due to ~~several contributing factors including,~~ modest loan ~~demand, the payoff of a few large loans, and the timing of funding for new loans.~~demand.

At March 31, ~~2017,~~2018, the allowance for loan losses to total loans represented ~~1.09%~~1.03% of total loans, compared to ~~1.10%~~1.09% at December 31, ~~2016.~~2017.

The fair value adjustment on acquired loans consists of an interest rate component to adjust the effective rates on the loans to market rates and a credit component to adjust for estimated credit exposures in the acquired loans. The interest rate component was $3.2 million at March 31, 2018 and zero at December 31, 2017. The credit component of the adjustment was ~~$1.8~~$11.1 million at March 31, ~~2017~~2018 and ~~$2.0~~$1.2 million at December 31, ~~2016~~2017 while the acquired loans outstanding were ~~$146.1~~$409.4 million and ~~$155.0~~$120.0 million, respectively.

Nonperforming and restructured assets totaled ~~$32.3~~$52.4 million at March 31, ~~2017,~~2018, compared to ~~$39.3~~$44.0 million at December 31, ~~2016.~~2017. The Company’s level of nonperforming and restructured assets has continued to be relatively low. ~~The decrease in nonperforming and restructured assets in 2017 was due to the resolution of two problem loans.~~

Nonaccrual loans totaled ~~$23.7~~$31.8 million at March 31, ~~2017,~~2018, compared to ~~$31.8~~$31.9 million at the end of ~~2016.~~2017. The Company’s nonaccrual loans are primarily commercial and real estate loans. Nonaccrual loans negatively impact the Company’s net interest margin. A loan is placed on nonaccrual status when, in the opinion of management, the future collectability of interest or principal or both is in serious doubt. Interest income is recognized on certain of these loans on a cash basis if the full collection of the remaining principal balance is reasonably expected. Otherwise, interest income is not recognized until the principal balance is fully collected. Had nonaccrual loans performed in accordance with their original contractual terms, the Company would have recognized additional interest income of approximately $542,000 for the first quarter of 2018 and $499,000 for the first quarter of ~~2017 and $513,000 for the first quarter of 2016.~~2017. Only a small amount of this interest is expected to be ultimately collected.

Restructured loans totaled $12.9 million at March 31, 2018, compared to $4.7 million at the end of 2017. The increase in restructured loans was due primarily to a few commercial loans identified as troubled debt restructurings during the quarter and the restructured loans from the two acquisitions. The Company charges interest on principal balances outstanding during deferral periods. As a result, the current and future financial effects of the recorded balance of loans considered to be troubled debt restructurings whose terms were modified during the period were not considered to be material.

Other real estate owned and repossessed assets totaled ~~$4.4~~$3.7 million at March 31, ~~2017,~~2018, compared to ~~$3.9~~$4.4 million at December 31, ~~2016.~~2017.

Potential problem loans are performing loans to borrowers with a weakened financial condition, or which are experiencing unfavorable trends in their financial condition, which causes management to have concerns as to the ability of such borrowers to comply with the existing repayment terms. The Company had approximately ~~$7.4~~$9.4 million of these loans at March 31, ~~2017,~~2018, compared to ~~$7.5~~$7.7 million at December 31, ~~2016.~~2017. Potential problem loans are not included in nonperforming and restructured loans. In general, these loans are adequately collateralized and have no specific identifiable probable loss. Loans which are considered to have identifiable probable loss potential are placed on nonaccrual status, are allocated a specific allowance for loss or are directly charged-down, and are reported as nonperforming.

At March 31, ~~2017,~~2018, deposits totaled ~~$6.4~~$6.7 billion, an increase of ~~$146.6~~$298.0 million from the December 31, ~~2016 balance.~~2017 total, which was primarily related to the acquisitions during the quarter. The Company’s core deposits provide it with a stable, low-cost funding source.

The Company’s core deposits as a percentage of total deposits were ~~94.9%~~97.8% at March 31, ~~2017~~2018 compared to ~~94.7%~~98.1% at December 31, ~~2016.~~2017. Noninterest-bearing deposits to total deposits were ~~41.5%~~39.2% at March 31, ~~2017,~~2018, compared to ~~40.4%~~39.8% at December 31, ~~2016.~~2017.

Short-term borrowings, consisting primarily of federal funds purchased and repurchase agreements are another source of funds for the Company. The level of these borrowings is determined by various factors, including customer demand and the Company’s ability to earn a favorable spread on the funds obtained. Short-term borrowings were ~~$800,000~~$100,000 at March 31, ~~2017,~~2018, compared to ~~$500,000~~$900,000 at December 31, ~~2016.~~2017.

The Company has a line of credit from the Federal Home Loan Bank (“FHLB”) of Topeka, Kansas to use for liquidity or to match-fund certain long-term fixed-rate loans. The Company’s assets, including residential first mortgages of ~~$670.0~~$755.4 million, are

pledged as collateral for the borrowings under the line of credit. As of March 31, ~~2017~~2018 and December 31, ~~2016,~~2017, the Company had no advances outstanding under the line of credit from FHLB. In addition, the Company has a revolving line of credit with another financial institution with the ability to draw up to $10.0 million with no advances outstanding. This line of credit has a variable rate based on prime rate minus 25 basis points and matures in 2020.

There have not been any other material changes from the liquidity and funding discussion included in Management’s Discussion and Analysis in the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2016.~~2017.

Stockholders’ equity totaled ~~$729.9~~$838.1 million at March 31, ~~2017,~~2018, compared to ~~$711.1~~$775.6 million at December 31, ~~2016.~~2017. In addition to net income of ~~$22.1~~$29.6 million, other changes in stockholders’ equity during the three months ended March 31, ~~2017~~2018 included ~~$2.8~~$40.8 million related to common stock ~~option exercises~~issuances and ~~$222,000~~$306,000 related to stock-based compensation, that were partially offset by ~~$6.1~~$6.9 million in dividends and a ~~$178,000~~$1.4 million decrease in other comprehensive income. The Company’s leverage ratio and total risk-based capital ratios at March 31, ~~2017,~~2018, were well in excess of the regulatory requirements.

See Note (6) of the Notes to Consolidated Financial Statements for a discussion of capital ratio requirements.

On January 20, 2017, the Company filed with the Securities and Exchange Commission (“SEC”) an automatic shelf registration statement on Form S-3, which became effective upon filing with the SEC. Under the shelf registration, the Company may offer and sell, from time to time, an indeterminate amount of its common stock in one or more future offerings.

There have not been any material changes in the resources required for scheduled repayments of contractual obligations from the table of Contractual Cash Obligations included in Management’s Discussion and Analysis which was included in the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2016.~~2017.

	Three Months Ended March 31,																Three Months Ended March 31,
	2017								2016								2018								2017
				Interest		Average						Interest		Average						Interest		Average						Interest		Average
	Average			Income/		Yield/			Average			Income/		Yield/			Average			Income/		Yield/			Average			Income/		Yield/
	Balance			Expense		Rate			Balance			Expense		Rate			Balance			Expense		Rate			Balance			Expense		Rate
ASSETS
Earning assets:
Loans (1)	$	4,400,707		$	53,833		4.96	%	$	4,242,883		$	50,329		4.76	%	$	4,993,902		$	63,055		5.12	%	$	4,400,707		$	53,833		4.96	%
Securities – taxable		435,196			1,761		1.64			491,505			1,327		1.08			438,848			1,898		1.75			435,196			1,761		1.64
Securities – tax exempt		33,291			287		3.50			42,539			393		3.71			29,444			216		2.98			33,291			287		3.50
Interest-bearing deposits w/ banks & FFS		1,724,747			3,440		0.81			1,419,500			1,802		0.51
Federal funds sold and interest-bearing deposits with banks																		1,536,973			5,886		1.55			1,724,747			3,440		0.81
Total earning assets		6,593,941			59,321		3.65			6,196,427			53,851		3.49			6,999,167			71,055		4.12			6,593,941			59,321		3.65
Nonearning assets:
Cash and due from banks		173,329								179,455								185,548								173,329
Interest receivable and other assets		337,123								336,841								382,536								337,123
Allowance for loan losses		(48,453	)							(41,591	)							(52,479	)							(48,453	)
Total nonearning assets		461,999								474,705								515,605								461,999
Total assets	$	7,055,940							$	6,671,132							$	7,514,772							$	7,055,940
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Transaction deposits	$	795,743		$	211		0.11	%	$	792,120		$	201		0.10	%	$	809,827		$	394		0.20	%	$	795,743		$	211		0.11	%
Savings deposits		2,263,918			2,297		0.41			2,078,802			1,691		0.33			2,451,433			5,106		0.84			2,263,918			2,297		0.41
Time deposits		685,575			1,217		0.72			721,792			1,188		0.66			777,811			1,769		0.92			685,575			1,217		0.72
Short-term borrowings		1,870			3		0.62			1,111			1		0.35			7,996			35		1.79			1,870			3		0.62
Junior subordinated debentures		31,959			527		6.69			31,959			522		6.55			31,959			535		6.79			31,959			527		6.69
Total interest-bearing liabilities		3,779,065			4,255		0.46			3,625,784			3,603		0.40			4,079,026			7,839		0.78			3,779,065			4,255		0.46
Interest-free funds:
Noninterest-bearing deposits		2,529,883								2,359,783								2,582,195								2,529,883
Interest payable and other liabilities		23,874								23,627								30,683								23,874
Stockholders’ equity		723,118								661,938								822,868								723,118
Total interest free funds		3,276,875								3,045,348								3,435,746								3,276,875
Total liabilities and stockholders’ equity	$	7,055,940							$	6,671,132							$	7,514,772							$	7,055,940
Net interest income				$	55,066							$	50,248							$	63,216							$	55,066
Net interest spread							3.19	%							3.09	%							3.34	%							3.19	%
Effect of interest free funds							0.20	%							0.16	%							0.32	%							0.20	%
Net interest margin							3.39	%							3.25	%							3.66	%							3.39	%

There have been no significant changes in the Registrant’s disclosures regarding market risk since December 31, ~~2016,~~2017, the date of its most recent annual report to stockholders.

The Company’s Chief Executive Officer, Chief Financial Officer and its Disclosure Committee, which includes the Company’s Executive Chairman, Chief Risk Officer, Chief Internal Auditor, Chief Asset Quality Officer, Controller, ~~and~~ General Counsel and Vice President of Corporate Finance, have evaluated, as of the last day of the period covered by this report, the Company’s disclosure controls and procedures. Based on their evaluation they concluded that the disclosure controls and procedures of the Company are

Company in the reports filed or submitted by it under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported, within the time periods specified in the applicable rules and forms.

No changes were made to the Company’s internal control over financial reporting during the period covered by this report that materially affected, or are likely to materially affect, the Company’s internal control over financial reporting.

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

As of March 31, ~~2017,~~2018, there have been no material changes from the risk factors previously disclosed in Part I, Item 1A, of the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2016.~~2017.

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

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

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

Large accelerated filer	☐☒	Accelerated filer	☒☐

Non-accelerated filer	☐ (Do not check if a smaller reporting company)	Smaller reporting company	☐

Emerging growth company	☐

						Wgtd. Avg.
				Wgtd. Avg.		Remaining	Aggregate
				Exercise		Contractual	Intrinsic
	Options			Price		Term	Value
	(Dollars in thousands, except option data)
Three Months Ended March 31, 2017
Outstanding at December 31, 2016		707,450		$	44.92
Options exercised		(76,450	)		34.14
Outstanding at March 31, 2017		631,000			46.23	9.75 Yrs	$	27,558
Exercisable at March 31, 2017		265,625			38.46	6.88 Yrs	$	13,663

						Wgtd. Avg.
				Wgtd. Avg.		Remaining	Aggregate
				Exercise		Contractual	Intrinsic
	Options			Price		Term	Value
	(Dollars in thousands, except option data)
Three Months Ended March 31, 2018
Outstanding at December 31, 2017		1,273,625		$	25.90
Options granted		30,000			54.73
Options exercised		(76,950	)		16.02
Outstanding at March 31, 2018		1,226,675			27.22	10.00 Yrs	$	31,747
Exercisable at March 31, 2018		520,925			20.77	7.30 Yrs	$	16,840

					Other		Executive,
	Metropolitan		Community		Financial		Operations
	Banks		Banks		Services		& Support		Consolidated
	(Dollars in thousands)
Three month ended March 31, 2017
Balance at beginning and end of period	$	8,078	$	40,050	$	5,464	$	450	$	54,042

	March 31, 2017
	(Dollars in thousands)
Unearned stock-based compensation expense	$	2,538

	Shares
Three Months Ended March 31, 2018		113,278
Three Months Ended March 31, 2017		—

		March 31, 2017						December 31, 2016
Oil and Natural Gas Swaps and Options	Notional Units	Notional Amount			Estimated Fair Value			Notional Amount			Estimated Fair Value
		(Notional amounts and dollars in thousands)
Oil
Derivative assets	Barrels		63		$	161			83		$	576
Derivative liabilities	Barrels		(63	)		(101	)		(83	)		(496	)

Natural Gas
Derivative assets	MMBTUs		1,770			367			1,900			993
Derivative liabilities	MMBTUs		(1,770	)		(228	)		(1,900	)		(810	)

Total Fair Value	Included in
Derivative assets	Other assets					528						1,569
Derivative liabilities	Other liabilities					(329	)					(1,306	)

	~~March 31, 2017~~		~~December 31, 2016~~
	~~(Dollars in thousands)~~
~~Credit exposure~~	$	—	$	—

Exhibit Number		Exhibit
3.1		Second Amended and Restated Certificate of Incorporation of BancFirst Corporation (filed as Exhibit 1 to the Company’s 8-A/A filed July 23, 1998 and incorporated herein by reference).

3.2		Certificate of Amendment of the Second Amended and Restated Certificate of Incorporation of BancFirst Corporation dated June 15, 2004 (filed as Exhibit 3.5 to the Company’s Quarterly Report on Form 10-Q for the Quarter Ended June 30, 2004 and incorporated herein by reference).

3.3		Amended and Restated By-Laws of BancFirst Corporation (filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K dated March 30, 2015 and incorporated herein by reference).

3.4		Certificate of Amendment of the Second Amended and Restated Certificate of Incorporation of BancFirst Corporation dated May 23, 2013 (filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K dated May 29, 2013 and incorporated herein by reference).

3.5		Certificate of Amendment of the Third Amended and Restated Certificate of Incorporation of BancFirst Corporation dated May 31, 2017 (filed as Exhibit 3.1 to the Company’s Current Report on Form 8-K dated May 31, 2017 and incorporated herein by reference).

4.1		Instruments defining the rights of securities holders (see Exhibits 3.1, 3.2, 3.3 and 3.4 above).

4.2		Form of Amended and Restated Trust Agreement relating to the 7.20% Cumulative Trust Preferred Securities of BFC Capital Trust II (filed as Exhibit 4.5 to the Company’s registration statement on Form S-3/A, File No. 333-112488 dated February 23, 2004, and incorporated herein by reference).

4.3		Form of 7.20% Cumulative Trust Preferred Security Certificate for BFC Capital Trust II (filed as Exhibit D to Exhibit 4.5 to the Company’s registration statement on Form S-3/A, File No. 333-112488 dated February 23, 2004, and incorporated herein by reference).

4.4		Form of Indenture relating to the 7.20% Junior Subordinated Deferrable Interest Debentures of BancFirst Corporation issued to BFC Capital Trust II (filed as Exhibit 4.1 to the Company’s registration statement on Form S-3, File No. 333-112488 dated February 4, 2004, and incorporated herein by reference).

4.5		Form of Certificate of 7.20% Junior Subordinated Deferrable Interest Debenture of BancFirst Corporation (filed as Exhibit 4.2 to the Company’s registration statement on Form S-3, File No. 333-112488 dated February 4, 2004, and incorporated herein by reference).

4.6		Form of Guarantee of BancFirst Corporation relating to the 7.20% Cumulative Trust Preferred Securities of BFC Capital Trust II (filed as Exhibit 4.7 to the Company’s registration statement on Form S-3/A, File No. 333-112488 dated February 23, 2004, and incorporated herein by reference).

4.7		Form of Guarantee Agreement by and between CSB Bancshares, Inc. and Wilmington Trust Company (filed as Exhibit 4.7 to the Company’s Quarterly Report on Form 10-Q for the Quarter ended September 30, 2015 and incorporated herein by reference).

4.8		Form of Indenture relating to the Floating Rate Junior Subordinated Deferrable Interest Debentures of CSB Bancshares, Inc., issued to Wilmington Trust Company (filed as Exhibit 4.8 to the Company’s Quarterly Report on Form 10-Q for the Quarter ended September 30, 2015 and incorporated herein by reference).

4.9		Form of First Supplemental Indenture relating to the Floating Rate Junior Subordinated Deferrable Interest Debentures by and between Wilmington Trust Company and BancFirst Corporation (filed as Exhibit 4.9 to the Company’s Quarterly Report on Form 10-Q for the Quarter ended September 30, 2015 and incorporated herein by reference).

10.1		BancFirst Corporation Employee Stock Ownership and Trust Agreement adopted effective January 1, 2015 (filed as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the Quarter Ended March 31, 2015 and incorporated herein by reference).
10.2		Amendment Number One to the BancFirst Corporation Employee Stock Ownership Plan (filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K dated February 26, 2018 and incorporated herein by reference).

~~10.2~~10.3		Fifth Amended and Restated BancFirst Corporation Directors’ Stock Option Plan (filed as Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the Quarter Ended June 30, 2016 and incorporated herein by reference).

~~10.3~~Exhibit Number		Exhibit
10.4		Fifth Amended and Restated BancFirst Corporation Directors’ Deferred Stock Compensation Plan (filed as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the Quarter Ended June 30, 2016 and incorporated herein by reference).

~~10.4~~10.5		Fourteenth Amended and Restated BancFirst Corporation Stock Option Plan (filed as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the Quarter Ended June 30, 2016 and incorporated herein by reference).

Exhibit Number10.6		~~Exhibit~~
~~10.5~~		Adoption Agreement for the BancFirst Corporation Thrift Plan adopted April 21, 2016 effective January 1, 2016. (filed as Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q for the Quarter Ended March 31, 2016 and incorporated herein by reference).
10.7		Amendment Number One to the BancFirst Corporation Thrift Plan. (filed as Exhibit 10.2 to the Company’s Current Report on Form 8-K dated February 26, 2018 and incorporated herein by reference).
31.1*		Chief Executive Officer’s Certification pursuant to Rule 13a-14(a) or Rule 15d-14(a).

31.2*		Chief Financial Officer’s Certification pursuant to Rule 13a-14(a) or Rule 15d-14(a).

32.132		CEO’s ~~Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.~~

32.2*		& CFO’s Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS*		XBRL Instance Document

101.SCH*		XBRL Taxonomy Extension Schema

101.CAL*		XBRL Taxonomy Extension Calculation Linkbase

101.DEF*		XBRL Taxonomy Extension Definition Linkbase

101.LAB*		XBRL Taxonomy Extension Label Linkbase

101.PRE*		XBRL Taxonomy Extension Presentation Linkbase

		BANCFIRST CORPORATION
		(Registrant)

Date: May ~~5, 2017~~4, 2018		/s/ David ~~E. Rainbolt~~Harlow
		David ~~E. Rainbolt~~Harlow
		President
		Chief Executive Officer
		(Principal Executive Officer)

Date: May ~~5, 2017~~4, 2018		/s/ Kevin Lawrence
		Kevin Lawrence
		Executive Vice President
		Chief Financial Officer
		(Principal Financial Officer)