Consolidated Statements of Earnings (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Interest revenue
Loans	$ 126,983	$ 123,740
Residential mortgage loans held for sale	1,768	1,339
Trading securities	300	414
Taxable securities	4,434	2,345
Tax-exempt securities	977	1,396
Total investment securities	5,411	3,741
Taxable securities	59,656	69,014
Tax-exempt securities	601	607
Total available for sale securities	60,257	69,621
Fair value option securitites	3,487	3,230
Funds sold and resell agreements	2	4
Total interest revenue	198,208	202,089
Interest expense
Deposits	17,498	24,042
Borrowed funds	1,589	1,831
Subordinated debentures	5,552	5,577
Total interest expense	24,639	31,450
Net interest revenue	173,569	170,639
Provision for credit losses	0	6,250
Net interest revenue after provision for credit losses	173,569	164,389
Other operating revenue
Brokerage and trading revenue	31,111	25,376
Transaction card revenue	25,430	28,445
Trust fees and commissions	18,438	18,422
Deposit service charges and fees	24,379	22,480
Mortgage banking revenue	33,078	17,356
Bank-owned life insurance	2,871	2,863
Other revenue	9,027	8,332
Total fees and commissions	144,334	123,274
Loss on sales of assets, net	(356)	(68)
Loss on derivatives, net	(2,473)	(2,413)
Loss on fair value option securities, net	(1,733)	(3,518)
Gain on available for sale securities, net	4,331	4,902
Total other-than-temporary impairment losses	(505)	0
Portion of loss reclassified from other comprehensive income	(3,217)	(4,599)
Net impairment losses recognized in earnings	(3,722)	(4,599)
Total other operating revenue	140,381	117,578
Other operating expense
Personnel	114,769	99,994
Business promotion	4,388	4,624
Professional fees and services	7,599	7,458
Net occupancy and equipment	16,023	15,604
Insurance	3,866	6,186
Data processing and communications	22,144	22,503
Printing, postage and supplies	3,311	3,082
Net losses and expenses of repossessed assets	2,245	6,015
Amortization of intangible assets	575	896
Mortgage banking costs	7,573	6,471
Change in fair value of mortgage servicing rights	(7,127)	(3,129)
Other expense	9,871	8,745
Total other operating expense	185,237	178,449
Income before taxes	128,713	103,518
Federal and state income tax	45,520	38,752
Net income	83,193	64,766
Net loss attributable to non-controlling interest	(422)	(8)
Net income attributable to BOK Financial Corp. shareholders	$ 83,615	$ 64,774
Earnings per share:
Basic (in dollars per share)	$ 1.22	$ 0.95
Diluted (in dollars per share)	$ 1.22	$ 0.94
Average shares used in computation:
Basic (in shares)	67,665,300	67,901,722
Diluted (in shares)	67,941,895	68,176,527
Dividends declared per share	$ 0.33	$ 0.25