Consolidated Statements of Earnings (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest revenue
Loans	$ 498,600	$ 513,429	$ 504,989
Residential mortgage loans held for sale	8,505	8,185	6,492
Trading securities	1,962	1,419	1,836
Investment securities, Taxable securities	14,260	16,848	12,581
Investment securities, Tax-exempt securities	4,781	3,577	4,768
Total investment securities	19,041	20,425	17,349
Available for sale securities, Taxable securities	204,830	237,226	258,828
Available for sale securities, Tax-exempt securities	2,380	2,487	2,394
Total available for sale securities	207,210	239,713	261,222
Fair value option securities	3,907	8,464	18,649
Restricted equity securities	5,071	2,291	2,118
Interest-bearing cash and cash equivalents	1,075	945	491
Total interest revenue	745,371	794,871	813,146
Interest expense
Deposits	55,564	67,013	88,890
Borrowed funds	6,589	6,531	8,826
Subordinated debentures	8,741	13,778	22,385
Total interest expense	70,894	87,322	120,101
Net interest revenue	674,477	707,549	693,045
Provision for credit losses	(27,900)	(22,000)	(6,050)
Net interest revenue after provision for credit losses	702,377	729,549	699,095
Other operating revenue
Brokerage and trading revenue	125,478	126,930	104,181
Transaction card revenue	116,823	107,985	116,757
Trust fees and commissions	96,082	80,053	73,290
Deposit service charges and fees	95,110	98,917	95,872
Mortgage banking revenue	121,934	169,302	91,643
Bank-owned life insurance	10,155	11,089	11,280
Other revenue	38,262	34,604	34,070
Total fees and commissions	603,844	628,880	527,093
Gain (loss) on assets, net	(925)	(1,415)	4,156
Gain (loss) on derivatives, net	(4,367)	(301)	2,686
Gain on fair value option securities, net	(15,212)	9,230	24,413
Change in fair value of mortgage servicing rights	22,720	(9,210)	(40,447)
Gain on available for sale securities, net	10,720	33,845	34,144
Total other-than-temporary impairment losses	(2,574)	(1,144)	(10,578)
Portion of loss recognized in (reclassified from) other comprehensive income	266	(6,207)	(12,929)
Net impairment losses recognized in earnings	(2,308)	(7,351)	(23,507)
Total other operating revenue	614,472	653,678	528,538
Other operating expense
Personnel	505,225	491,033	429,986
Business promotion	22,598	23,338	20,549
Contribution to BOKF Foundation	2,062	2,062	4,000
Professional fees and services	32,552	34,015	28,798
Net occupancy and equipment	69,773	66,726	64,611
Insurance	16,122	15,356	16,799
Data processing and communications	106,075	98,904	97,976
Printing, postage and supplies	13,885	14,228	14,085
Net losses and expenses of repossessed assets	5,160	20,528	23,715
Amortization of intangible assets	3,428	2,927	3,583
Mortgage banking costs	31,088	44,334	37,621
Other expense	32,652	26,912	37,575
Total other operating expense	840,620	840,363	779,298
Income before taxes	476,229	542,864	448,335
Federal and state income tax	157,298	188,740	158,511
Net income	318,931	354,124	289,824
Net income attributable to non-controlling interests	2,322	2,933	3,949
Net income attributable to BOK Financial Corp. shareholders	$ 316,609	$ 351,191	$ 285,875
Earnings per share:
Basic (in dollars per share)	$ 4.61	$ 5.15	$ 4.18
Diluted (in dollars per share)	$ 4.59	$ 5.13	$ 4.17
Average shares used in computation:
Basic (in shares)	67,988,897	67,684,043	67,787,676
Diluted (in shares)	68,205,519	67,964,940	68,038,763
Dividends declared per share (in dollars per share)	$ 1.54	$ 2.47	$ 1.13