Consolidated Statements of Earnings (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest revenue
Loans	$ 131,175	$ 123,830	$ 258,158	$ 247,570
Residential mortgage loans held for sale	1,784	1,505	3,552	2,844
Trading securities	364	434	664	848
Taxable securities	4,282	2,800	8,716	5,145
Tax-exempt securities	921	1,324	1,898	2,720
Total investment securities	5,203	4,124	10,614	7,865
Taxable securities	61,583	69,978	121,239	138,992
Tax-exempt securities	631	600	1,232	1,207
Total available for sale securities	62,214	70,578	122,471	140,199
Fair value optioin securities	2,311	5,243	5,798	8,473
Funds sold and resell agreements	4	3	6	7
Total interest revenue	203,055	205,717	401,263	407,806
Interest expense
Deposits	16,390	23,160	33,888	47,202
Borrowed funds	1,792	3,015	3,381	4,846
Subordinated debentures	3,512	5,541	9,064	11,118
Total interest expense	21,694	31,716	46,333	63,166
Net interest revenue	181,361	174,001	354,930	344,640
Provision for credit losses	(8,000)	2,700	(8,000)	8,950
Net interest revenue after provision for credit losses	189,361	171,301	362,930	335,690
Other operating revenue
Brokerage and trading revenue	32,600	23,725	63,711	49,101
Transaction card revenue	26,758	31,024	52,188	59,469
Trust fees and commissions	19,931	19,150	38,369	37,572
Deposit service charges and fees	25,216	23,857	49,595	46,337
Mortgage banking revenue	39,548	19,356	72,626	36,712
Bank-owned life insurance	2,838	2,872	5,709	5,735
Other revenue	7,559	7,842	16,586	16,174
Total fees and commissions	154,450	127,826	298,784	251,100
Gain (loss) on sales of assets, net	3,765	3,344	3,409	3,276
Gain on derivatives, net	2,345	1,225	(128)	(1,188)
Gain on fair value option securities, net	6,852	9,921	5,119	6,403
Gain on available for sale securities, net	20,481	5,468	24,812	10,370
Total other-than-temporary impairment losses	(135)	(74)	(640)	(74)
Portion of loss recognized in (reclassified from) other comprehensive income	(723)	(4,750)	(3,940)	(9,349)
Net impairment losses recognized in earnings	(858)	(4,824)	(4,580)	(9,423)
Total other operating revenue	187,035	142,960	327,416	260,538
Other operating expense
Personnel	122,297	105,603	237,066	205,597
Business promotion	6,746	4,777	11,134	9,401
Professional fees and services	8,343	6,258	15,942	13,716
Net occupancy and equipment	16,906	15,554	32,929	31,158
Insurance	4,011	4,771	7,877	10,957
Data processing and communications	25,264	24,428	47,408	46,931
Printing, postage and supplies	3,903	3,586	7,214	6,668
Net losses and expenses of repossessed assets	5,912	5,859	8,157	11,874
Amortization of intangible assets	545	896	1,120	1,792
Mortgage banking costs	11,173	8,968	18,746	15,439
Change in fair value of mortgage servicing rights	11,450	13,493	4,323	10,364
Other expense	7,236	9,016	17,107	17,761
Total other operating expense	223,786	203,209	409,023	381,658
Income before taxes	152,610	111,052	281,323	214,570
Federal and state income tax	53,149	39,357	98,669	78,109
Net income	99,461	71,695	182,654	136,461
Net income (loss) attributable to non-controlling interest	1,833	2,688	1,411	2,680
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	1,833	2,688	1,411	2,680
Net income attributable to BOK Financial Corporation	$ 97,628	$ 69,007	$ 181,243	$ 133,781
Earnings per share:
Basic (in dollars per share)	$ 1.43	$ 1.01	$ 2.66	$ 1.96
Diluted (in dollars per share)	$ 1.43	$ 1.00	$ 2.65	$ 1.95
Average shares used in computation:
Basic (in shares)	67,472,665	67,898,483	67,573,280	67,900,279
Diluted (in shares)	67,744,828	68,169,485	67,847,659	68,173,182
Dividends declared per share (in dollars per share)	$ 0.38	$ 0.275	$ 0.71	$ 0.525