Exhibit 99 (a)

NASD: BOKF

For Further Information Contact:

Steven Nell             Andrea Myers

Chief Financial Officer     Corporate Communications

(918) 588-6752         (918) 594-7794

BOK Financial Reports Record Earnings of $351 Million for 2012

Fourth Quarter Earnings Total $83 Million

TULSA, Okla. ( Wednesday, January 30, 2013 ) - BOK Financial Corporation reported record net income of $351.2 million or $5.13 per diluted share for the year ended December 31, 2012 , up $ 65.3 million or 23% over 2011. Net income for the year ended December 31, 2011 was $285.9 million or $4.17 per diluted share.

“BOK Financial's results for 2012 reflect the value of our diversified revenue business model,” said President and CEO Stan Lybarger. “Non-interest revenue increased by $103 million or 20% over 2011, led by tremendous growth in mortgage banking revenue. Our mortgage banking professionals originated over $3.7 billion in loans, assisting a record number of customers in the purchase or refinance of their home during this year. In addition to mortgage banking revenue, brokerage and trading revenue was up nearly $23 million over the previous year, which more than offset the full year effect of regulatory limits on interchange fees."

"Our commercial loan portfolio grew by $1.1 billion or 16% and deposits grew by $2.4 billion or 13% over December 31, 2011," said Lybarger. "Additionally, continued improvements in credit quality in 2012 required us to further reduce our combined allowances for credit losses by $45 million through net charge-offs and a $22 million negative provision for credit losses."

"While persistently low interest rates and modest economic growth present a challenge for all banks, including BOK Financial, we expect the Company to continue to perform well," said Lybarger. "Our outlook for the upcoming year includes continued loan growth, increased non-interest revenue and operating expense discipline."

Net income for the fourth quarter of 2012 totaled $82.6 million or $1.21 per diluted share, compared to net income of $87.4 million or $1.27 per diluted share for the third quarter of 2012 and net income of $67.0 million or $0.98 per diluted share for the fourth quarter of 2011 .

Highlights of fourth quarter of 2012 included:

Net Interest Revenue

Net interest revenue decrease d $2.7 million compared to the third quarter of 2012 . Net interest margin was 2.95% for the fourth quarter of 2012 compared to 3.12% for the third quarter of 2012 .

The yield on average earning assets decrease d 17 basis points compared to the prior quarter. The available for sale securities portfolio yield decrease d 28 basis points to 2.10% due primarily to the continued reinvestment of cash flows from the portfolio at lower current rates. The loan portfolio yield of 4.33% was unchanged compared to the previous quarter.

"In the present low interest rate environment, our ability to further decrease funding costs is limited," said Steven Nell, Chief Financial Officer. "In addition, our ability to bolster near term net interest revenue through continued securities portfolio growth may be constrained by our conservative approach to interest rate risk management. We intend to focus on supporting net interest revenue through continued loan portfolio growth. Based on the current interest rate environment, we see continued pressure on net interest margin in 2013."

Average earning assets increase d $741 million during the fourth quarter of 2012 . The average balance of the available for sale securities portfolio increase d $424 million over the third quarter of 2012 due primarily to growth in residential and commercial mortgage-backed securities issued by U.S. government agencies. Average outstanding loans increase d $250 million due primarily to a $209 million increase in commercial loan balances.

Average deposits increase d $1.4 billion over the previous quarter. Demand deposit balances were up $787 million and interest-bearing transaction account balances increase d $624 million . Time deposit account balances decrease d $59 million . The average balance of borrowed funds decrease d $328 million compared to the third quarter of 2012 .

Fees and Commissions Revenue

Fees and commissions revenue totaled $165.8 million , largely unchanged compared to the third quarter of 2012 . Increased revenue from an acquisition made during the third quarter was mostly offset by decreased mortgage banking revenue.

Mortgage banking revenue totaled $46.4 million , down $3.9 million from the prior quarter. Record mortgage loan production volume during the fourth quarter was offset by a seasonal decrease in mortgage loan commitments and loans held for sale. Residential mortgage loans funded for sale totaled $1.1 billion for the fourth quarter of 2012 , up $27 million or 3% over the previous quarter. Refinanced mortgage loans were 62% of loans originated for sale in the fourth quarter of 2012 compared to 61% of the loans originated for sale in the third quarter of 2012 . Outstanding mortgage loan commitments decreased $95 million and the unpaid principal balance of loans held for sale decreased $25 million compared to September 30, 2012 .

"Despite some industry forecasts of a reduction in mortgage lending activity, we expect our mortgage banking revenue to remain strong in 2013," said Nell. "During 2012, we increased the number of mortgage lenders, expanded further into our regional markets and added correspondent loan origination channels. In addition, it does not appear that government policies that stimulate mortgage lending will end anytime soon. We also expect continued revenue growth from our wealth management business in 2013 through a full year's performance from our Milestone acquisition and further expansion throughout our regional markets."

Trust fees and commissions revenue were up $2.4 million primarily related to revenue from The Milestone Group, Inc., a Denver-based Registered Investment Adviser acquired by BOK Financial in the third quarter. Brokerage and trading revenue increase d $697 thousand , transaction card revenue increase d $221 thousand and deposit service charges and fees decrease d $974 thousand .

Operating Expenses

Total operating expenses were $222.1 million for the fourth quarter of 2012 compared to $222.3 million for the third quarter of 2012 . Excluding changes in the fair value of mortgage servicing rights, operating expenses totaled $226.8 million , up $14.0 million over the third quarter of 2012 .

Personnel costs increase d $8.4 million over the third quarter of 2012 due largely to increased incentive compensation and health care costs. Incentive compensation expense increase d $5.8 million . Stock-based incentive compensation expense increase d $4.8 million primarily due to increased incentive compensation accruals for executive compensation plans. Cash-based incentive compensation, which rewards employees as they generate business opportunities for the Company by growing loans, deposits, customer relationships or other measurable metrics, increase d $1.0 million . Employee health care costs increased $3.0 million over the third quarter of 2012 primarily due to an increased level of large dollar claims.

Non-personnel expense increase d $5.6 million over the third quarter of 2012 . During the fourth quarter, the Company made a $2.1 million discretionary contribution to the BOKF Foundation. The BOKF Foundation partners with various charitable organizations to support needs within our communities. All other non-personnel expenses were up $3.5 million over the previous quarter.

Loans, Deposits and Capital

Loans

Outstanding loans at December 31, 2012 were $12.3 billion , up $479 million over September 30, 2012 . All categories of loans experienced growth during the fourth quarter.

Outstanding commercial loan balances grew by $351 million or 19% on an annualized basis over September 30, 2012 . Outstanding balances were up in most geographic markets, including $133 million in Oklahoma, $125 million in Texas, $46 million in Kansas/Missouri and $33 million in Colorado. Service sector loans grew by $134 million primarily in the Texas and Oklahoma markets. Energy sector loans increase d $57 million . Energy sector loans grew primarily in the Oklahoma and Colorado markets, partially offset by a decrease in the Texas market. Healthcare sector loans increase d $56 million primarily in the Texas market. Wholesale/retail sector loans increase d $55 million primarily in the Texas and Kansas/Missouri markets, partially offset by a decrease in the Oklahoma market. Other commercial and industrial sector loans increase d $33 million and manufacturing sector loans increase d $18 million both primarily in the Oklahoma market. Unfunded energy loan commitments increased $170 million during the

fourth quarter to $2.4 billion. All other unfunded commercial loan commitments totaled $3.2 billion at December 31, 2012 , up slightly from September 30, 2012 .

Commercial real estate loans were up $68 million over September 30, 2012 . Loans secured by industrial properties increase d by $59 million primarily in the Texas market. Other real estate loans increase d $24 million . Growth in the Oklahoma and Colorado markets was partially offset by a decrease in the Texas market. Loans secured by office buildings were up $20 million primarily due to growth in the Texas market, partially offset by a decrease in loans attributed to the Oklahoma market. Growth in these loan classes was partially offset by a $40 million decrease in construction and land development loans primarily in the Oklahoma, Texas and Colorado markets. Unfunded commercial real estate loan commitments totaled $621 million at December 31, 2012 , up $47 million over September 30, 2012 .

Residential mortgage loans increase d $32 million over September 30, 2012 . Home equity loans increase d $46 million . Growth continues to be primarily focused in first-lien, fully amortizing home equity loans. At December 31, 2012 , approximately 63% of our $761 million home equity loan portfolio consisted of first-lien, fully amortizing loans. Non-guaranteed permanent mortgage loans decrease d $11.0 million . Permanent mortgage loans guaranteed by U.S. government agencies decrease d $2.2 million .

Consumer loans increase d $28 million from September 30, 2012 . Other consumer loans were up $40 million over September 30, 2012 , partially offset by a $13 million decrease primarily related to continued runoff of indirect automobile loans resulting from the previously announced decision to curtail that business in favor of a customer-focused direct approach to consumer lending. Approximately $35 million of indirect automobile loans remain outstanding at December 31, 2012 .

Deposits

Deposits totaled $21.2 billion at December 31, 2012 compared to $19.1 billion at September 30, 2012 . Demand deposit balances increase d $1.2 billion . Interest-bearing transaction account balances increase d $885 million and time deposits decrease d $54 million . Among the lines of business, commercial deposits increase d $1.1 billion , wealth management deposits increase d $599 million and consumer deposits increase d $80 million . Energy, commercial real estate, treasury services and small business customer account balances all increased over the prior quarter. Commercial customers continue to maintain high account balances due to continued economic uncertainty and persistently low yields available on high-quality investment alternatives. A significant driver of deposit growth in the fourth quarter was sales of businesses or assets by customers. During the first half of January 2013, demand deposit balances decreased by approximately $700 million as customers redeployed these funds.

The temporary unlimited deposit insurance coverage program for noninterest-bearing transaction accounts at all FDIC-insured institutions provided for by the Dodd-Frank Wall Street Reform and Consumer Protection Act expired on December 31, 2012. Noninterest-bearing transaction accounts are now insured up to $250,000.

Capital

The Company and its subsidiary bank exceeded the regulatory definition of well capitalized at December 31, 2012 . The Company's Tier 1 capital ratio was 12.78% at December 31, 2012 and 13.21% at September 30, 2012 . The total capital ratio was 15.13% at December 31, 2012 and 15.71% at September 30, 2012 . In addition, the Company's tangible common equity ratio, a non-GAAP measure, was 9.25% at December 31, 2012 and 9.67% at September 30, 2012 . Unrealized securities gains added 48 basis points to the tangible common equity ratio at December 31, 2012 . The decrease in Tier 1, total and tangible common equity ratios was largely due to the $1.00 per share special dividend paid in the fourth quarter.

"BOK Financial has increased cash dividends each year since paying its first quarterly cash dividend in 2005," said Nell. "We will consider migrating toward a higher regular dividend payout ratio in the future, subject to attractive capital deployment opportunities."

In June 2012, banking regulators issued a Notice of Proposed Rulemaking that will incorporate Basel III capital changes for substantially all U.S. banking organizations. If adopted as proposed, these changes will establish a 7% threshold for the Tier 1 common equity ratio consisting of a minimum level plus a capital conservation buffer. BOK Financial's Tier 1 common equity ratio based on the existing Basel I standards was 12.59% as of December 31, 2012 . Our estimated Tier 1 common equity ratio under a fully phased in Basel III framework is approximately 12.15%, nearly 515 basis points above the 7% regulatory threshold. This estimate is subject to interpretation of rules that are not yet final. Additionally, the proposed definition of Tier 1 common equity includes unrealized gains and losses on available for sale securities which will vary based on market conditions.

Credit Quality

Nonperforming assets increase d $13 million during the fourth quarter of 2012 to $277 million or 2.23% of outstanding loans and repossessed assets at December 31, 2012 . Excluding the impact of recent regulatory guidance that primarily affected residential mortgage loans, nonperforming assets decreased $19 million. Implementation of this guidance increased nonperforming assets by $31 million in the fourth quarter.

The Office of the Comptroller of the Currency issued interpretive guidance in the third quarter of 2012 regarding accounting for and classification of retail loans to borrowers who have filed for Chapter 7 bankruptcy. This guidance requires that these loans be charged-down to collateral value and classified as nonaccruing and troubled debt restructurings, regardless of current payment status. We have generally been complying with this guidance by charging down such loans to collateral value. Implementation of this guidance in the fourth quarter did not significantly affect charge-offs or provision for credit losses. Nonaccruing loans increased by approximately $19 million. At December 31, 2012, payments on approximately 65% of these newly-identified nonaccruing loans are current. Most of this increase in nonaccruing loans is attributed to residential mortgage loans in the the Oklahoma market. Implementation of this guidance also increased renegotiated residential mortgage loans guaranteed by U.S. government agencies by $12 million.

Nonaccruing loans totaled $134 million or 1.09% of outstanding loans at December 31, 2012 and $132 million or 1.11% of outstanding loans at September 30, 2012 . New nonaccruing loans identified in the fourth quarter totaled $38 million, including $19 million identified related to the implementation of the recent regulatory guidance on Chapter 7 bankruptcies. This was offset by $16 million in payments received, $8.0 million in charge-offs and $13 million in foreclosures and repossessions .

Nonaccruing commercial loans increased to $24 million or 0.32% of outstanding commercial loans at December 31, 2012 from $22 million or 0.30% of outstanding commercial loans at September 30, 2012 . Nonaccruing commercial real estate loans decreased to $61 million or 2.71% of outstanding commercial real estate loans at December 31, 2012 from $76 million or 3.50% of outstanding commercial real estate loans at September 30, 2012 . Nonaccruing commercial real estate loans consist primarily of land development and residential construction loans. Nonaccruing land development and residential construction loans totaled $26 million or 10.49% of all land development and construction loans at December 31, 2012 , a decrease of $12 million during the fourth quarter.

Nonaccruing residential mortgage loans increase d $17 million during the fourth quarter of 2012 to $47 million or 2.27% of outstanding residential mortgage loans. Principally all non-guaranteed residential mortgage loans past due 90 days or more are nonaccruing. Residential mortgage loans past due 30 to 89 days and still accruing interest, excluding loans guaranteed by U.S. government agencies, totaled $11 million at December 31, 2012 and $21 million at September 30, 2012 .

The combined allowance for credit losses totaled $217 million or 1.77% of outstanding loans and 161.76% of nonaccruing loans at December 31, 2012 . The allowance for loan losses was $216 million and the accrual for off-balance sheet credit losses was $1.9 million . Gross charge-offs continue to decrease, totaling $8.0 million for the fourth quarter, compared to $8.9 million for the previous quarter. Recoveries totaled $3.7 million for the fourth quarter of 2012 . Net charge-offs totaled $4.3 million or 0.14% on an annualized basis for the fourth quarter of 2012 compared with net charge-offs of $5.7 million or 0.19% on an annualized basis for the third quarter of 2012 .

After evaluating all credit factors, the Company determined that a $14 million negative provision for credit losses was necessary during the fourth quarter of 2012 . Improving trends in gross charge-offs and loan portfolio risk grading across most loan classes resulted in lower estimated loss rates used in developing the combined allowance for credit losses. Most economic factors are stable or improving in our primary markets.

Real estate and other repossessed assets totaled $104 million at December 31, 2012 , primarily consisting of $44 million of 1-4 family residential properties (including $22 million guaranteed by U.S. government agencies), $25 million of developed commercial real estate properties, $18 million of undeveloped land and $16 million of residential land and land development properties. The distribution of real estate owned and other repossessed assets among various markets included $29 million attributed to Arizona, $18 million attributed to New Mexico, $16 million attributed to Texas, $15 million attributed to Oklahoma and $13 million attributed to Colorado. Real estate and other repossessed assets decrease d by $337 thousand during the fourth quarter of 2012 . Additions of $36 million were partially offset by $33 million of sales. Additions included $23 million and sales included $24 million of 1-4 family residential properties guaranteed by U.S. government agencies. Write-downs and net losses on sales of real estate and other repossessed assets totaled $4.1 million.

Securities and Derivatives

The fair value of the available for sale securities portfolio totaled $11.3 billion at December 31, 2012 and $11.5 billion at September 30, 2012 . At December 31, 2012 , the available for sale portfolio consisted primarily of $9.9 billion of residential mortgage-backed securities fully backed by U.S. government agencies, $895 million of commercial mortgage-backed securities fully backed by U.S. government agencies, and $325 million of residential mortgage-backed securities privately issued by publicly owned financial institutions. Privately issued residential mortgage-backed securities included $202 million

backed by Jumbo-A mortgage loans and $123 million backed by Alt-A mortgage loans. Net unamortized premiums are less than 1% of the securities portfolio amortized cost.

Net unrealized gains on available for sale securities totaled $255 million at December 31, 2012 and $281 million at September 30, 2012 . Net unrealized gains on residential mortgage-backed securities issued by U.S. government agencies decrease d $34 million during the fourth quarter to $239 million at December 31, 2012 . The privately issued residential mortgage-backed securities portfolio has a net unrealized gain of $2.3 million at December 31, 2012 compared to a net unrealized loss of $5.3 million at September 30, 2012 .

The amortized cost of privately issued residential mortgage-backed securities totaled $323 million at December 31, 2012 , down $14 million since September 30, 2012 . All of these securities are rated below investment grade by at least one nationally-recognized rating agency. The amortized cost of these securities was reduced during the fourth quarter of 2012 by $14 million of cash payments received and $197 thousand of credit-related impairment charges during the quarter.

In the fourth quarter of 2012 , the Company recognized net gains of $1.1 million from sales of $84 million of available for sale securities. These securities were sold either because they had reached their expected maximum potential total return or to mitigate exposure to prepayment risk. Net gains from sales of $209 million of available for sale securities in the third quarter of 2012 totaled $8.0 million .

The Company also maintains a portfolio of residential mortgage-backed securities issued by U.S. government agencies and interest rate derivative contracts designated as an economic hedge of the changes in the fair value of our mortgage servicing rights. Due to changes in residential mortgage interest rates during the fourth quarter of 2012 , prepayment speeds decreased and the value of our mortgage servicing rights increase d by $4.7 million . This increase was partially offset by a $2.9 million decrease in the value of securities and interest rate derivative contracts held as an economic hedge.

About BOK Financial Corporation

BOK Financial is a $28 billion regional financial services company based in Tulsa, Oklahoma. The Company's stock is publicly traded on NASDAQ under the Global Select market listings (symbol: BOKF). BOK Financial's holdings include BOKF, NA, BOSC, Inc., The Milestone Group, Inc. and Cavanal Hill Investment Management, Inc. BOKF, NA operates the TransFund electronic funds network and seven banking divisions: Bank of Albuquerque, Bank of Arizona, Bank of Arkansas, Bank of Kansas City, Bank of Oklahoma, Bank of Texas and Colorado State Bank and Trust. Through its subsidiaries, the Company provides commercial and consumer banking, investment and trust services, mortgage origination and servicing, and an electronic funds transfer network. For more information, visit www.bokf.com .

The Company will continue to evaluate critical assumptions and estimates, such as the adequacy of the allowance for credit losses and asset impairment as of December 31, 2012 through the date its financial statements are filed with the Securities and Exchange Commission and will adjust amounts reported if necessary.

This news release contains forward-looking statements that are based on management's beliefs, assumptions, current expectations, estimates and projections about BOK Financial, the financial services industry and the economy generally. Words such as “anticipates,” “believes,” “estimates,” “expects,” “forecasts,” “plans,” “projects,” variations of such words and similar expressions are intended to identify such forward-looking statements. Management judgments relating to and discussion of the provision and allowance for credit losses involve judgments as to future events and are inherently forward-looking statements. Assessments that BOK Financial's acquisitions and other growth endeavors will be profitable are necessary statements of belief as to the outcome of future events based in part on information provided by others which BOK Financial has not independently verified. These statements are not guarantees of future performance and involve certain risks, uncertainties, and assumptions which are difficult to predict with regard to timing, extent, likelihood and degree of occurrence. Therefore, actual results and outcomes may materially differ from what is expected, implied or forecasted in such forward-looking statements. Internal and external factors that might cause such a difference include, but are not limited to (1) the ability to fully realize expected cost savings from mergers within the expected time frames, (2) the ability of other companies on which BOK Financial relies to provide goods and services in a timely and accurate manner, (3) changes in interest rates and interest rate relationships, (4) demand for products and services, (5) the degree of competition by traditional and nontraditional competitors, (6) changes in banking regulations, tax laws, prices, levies and assessments, (7) the impact of technological advances and (8) trends in consumer behavior as well as their ability to repay loans. BOK Financial and its affiliates undertake no obligation to update, amend or clarify forward-looking statements, whether as a result of new information, future events, or otherwise.

BALANCE SHEETS -- UNAUDITED BOK FINANCIAL CORPORATION (in thousands)
		December 31, 2012				September 30, 2012				December 31, 2011
ASSETS
Cash and due from banks		$	1,266,834			$	596,590			$	976,191
Funds sold and resell agreements		19,405				18,904				10,174
Trading securities		214,102				204,242				76,800
Investment securities		499,534				432,114				439,236
Available for sale securities		11,287,221				11,506,434				10,179,365
Fair value option securities		284,296				331,887				651,226
Residential mortgage loans held for sale		293,762				325,102				188,125
Loans:
Commercial		7,624,420				7,273,217				6,555,070
Commercial real estate		2,233,158				2,165,526				2,291,303
Residential mortgage		2,051,354				2,018,980				1,974,527
Consumer		402,524				374,644				448,843
Total loans		12,311,456				11,832,367				11,269,743
Less allowance for loan losses		(215,507		)		(233,756		)		(253,481		)
Loans, net of allowance		12,095,949				11,598,611				11,016,262
Premises and equipment, net		265,920				259,195				262,735
Receivables		114,185				116,243				123,257
Goodwill		361,979				358,962				335,601
Intangible assets, net		28,192				33,196				10,219
Mortgage servicing rights, net		100,812				89,653				86,783
Real estate and other repossessed assets		103,791				104,128				122,753
Bankers' acceptances		605				1,605				1,881
Derivative contracts		338,106				435,653				293,859
Cash surrender value of bank-owned life insurance		274,531				271,830				263,318
Receivable on unsettled securities sales		211,052				32,480				75,151
Other assets		388,355				400,812				381,010
TOTAL ASSETS		$	28,148,631			$	27,117,641			$	25,493,946

LIABILITIES AND EQUITY
Deposits:
Demand		$	8,038,286			$	6,848,401			$	5,799,785
Interest-bearing transaction		9,888,038				9,002,567				9,354,456
Savings		284,744				269,573				226,357
Time		2,967,992				3,022,326				3,381,982
Total deposits		21,179,060				19,142,867				18,762,580
Funds purchased		1,167,416				1,680,626				1,063,318
Repurchase agreements		887,030				1,109,696				1,233,064
Other borrowings		651,775				639,254				74,485
Subordinated debentures		347,633				347,592				398,881
Accrued interest, taxes, and expense		176,678				182,410				149,508
Bankers' acceptances		605				1,605				1,881
Due on unsettled securities purchases		297,453				556,998				653,371
Derivative contracts		283,589				254,422				236,522
Other liabilities		163,711				189,696				133,684
TOTAL LIABILITIES		25,154,950				24,105,166				22,707,294
Shareholders' equity:
Capital, surplus and retained earnings		2,807,940				2,813,264				2,621,489
Accumulated other comprehensive income		149,920				162,393				128,979
TOTAL SHAREHOLDERS' EQUITY		2,957,860				2,975,657				2,750,468
Non-controlling interest		35,821				36,818				36,184
TOTAL EQUITY		2,993,681				3,012,475				2,786,652
TOTAL LIABILITIES AND EQUITY		$	28,148,631			$	27,117,641			$	25,493,946