Consolidated Statements of Earnings (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest revenue
Loans	$ 123,830	$ 131,102	$ 247,570	$ 263,046
Residential mortgage loans held for sale	1,505	2,177	2,844	3,924
Trading securities	434	542	848	1,152
Taxable securities	2,800	1,784	5,145	2,786
Tax-exempt securities	1,324	1,766	2,720	3,561
Total investment securities	4,124	3,550	7,865	6,347
Taxable securities	69,978	75,228	138,992	152,803
Tax-exempt securities	600	542	1,207	1,196
Total available for sale securities	70,578	75,770	140,199	153,999
Mortgage trading securities	5,243	4,448	8,473	8,483
Funds sold and resell agreements	3	8	7	16
Total interest revenue	205,717	217,597	407,806	436,967
Interest expense
Deposits	23,160	26,292	47,202	53,909
Borrowed funds	3,015	3,657	4,846	7,270
Subordinated debentures	5,541	5,535	11,118	11,101
Total interest expense	31,716	35,484	63,166	72,280
Net interest revenue	174,001	182,113	344,640	364,687
Provision for credit losses	2,700	36,040	8,950	78,140
Net interest revenue after provision for credit losses	171,301	146,073	335,690	286,547
Other operating revenue
Brokerage and trading revenue	23,725	24,754	49,101	45,789
Transaction card revenue	31,024	28,263	59,469	53,950
Trust fees and commissions	19,150	17,737	37,572	34,057
Deposit service charges and fees	23,857	28,797	46,337	55,589
Mortgage banking revenue	19,356	18,335	36,712	33,206
Bank-owned life insurance	2,872	2,908	5,735	5,880
Other revenue	7,842	7,374	16,174	15,012
Total fees and commissions	127,826	128,168	251,100	243,483
Gain on sales of assets, net	3,344	1,545	3,276	155
Gain (loss) on derivatives, net	1,225	7,272	(1,188)	6,931
Gain on mortgage trading securities, net	9,921	14,631	6,403	15,079
Gain on available for sale securities, net	5,468	8,469	10,370	12,545
Total other-than-temporary impairment losses	(74)	(10,959)	(74)	(20,667)
Portion of loss recognized in (reclassified from) other comprehensive income	(4,750)	8,313	(9,349)	13,796
Net impairment losses recognized in earnings	(4,824)	(2,646)	(9,423)	(6,871)
Total other operating revenue	142,960	157,439	260,538	271,322
Other operating expense
Personnel	105,603	97,054	205,597	193,878
Business promotion	4,777	4,945	9,401	8,923
Professional fees and services	6,258	6,668	13,716	13,069
Net occupancy and equipment	15,554	15,691	31,158	31,202
Insurance	4,771	5,596	10,957	12,129
Data processing and communications	24,428	21,940	46,931	42,249
Printing, postage and supplies	3,586	3,525	6,668	6,847
Net losses and expenses of repossessed assets	5,859	13,067	11,874	20,287
Amortization of intangible assets	896	1,323	1,792	2,647
Mortgage banking costs	8,968	10,380	15,439	19,647
Change in fair value of mortgage servicing rights	13,493	19,458	10,364	5,526
Other expense	9,016	6,265	17,761	13,240
Total other operating expense	203,209	205,912	381,658	369,644
Income before taxes	111,052	97,600	214,570	188,225
Federal and state income tax	39,357	32,042	78,109	62,325
Net income	71,695	65,558	136,461	125,900
Net income attributable to non-controlling interest	2,688	2,036	2,680	2,245
Net income attributable to BOK Financial Corporation	$ 69,007	$ 63,522	$ 133,781	$ 123,655
Earnings per share:
Basic	$ 1.01	$ 0.93	$ 1.96	$ 1.82
Diluted	$ 1.00	$ 0.93	$ 1.95	$ 1.81
Average shares used in computation:
Basic	67,898,483	67,605,807	67,900,279	67,599,349
Diluted	68,169,485	67,880,587	68,173,182	67,835,606
Dividends declared per share	$ 0.275	$ 0.25	$ 0.525	$ 0.49