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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Stockholders' Equity Note [Abstract]  
Summary of Regulatory Capital Levels [Table Text Block]
A summary of regulatory capital levels follows (dollars in thousands):
 
 
As of December 31,
 
 
2013
 
2012
Total Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
Consolidated
 
$
3,017,022

 
15.56
%
 
$
2,877,949

 
15.13
%
BOKF, NA
 
2,293,673

 
11.88

 
2,296,451

 
12.13

Tier I Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
Consolidated
 
$
2,668,981

 
13.77
%
 
$
2,430,671

 
12.78
%
BOKF, NA
 
1,946,247

 
10.08

 
1,849,769

 
9.77

Tier I Capital (to Average Assets):
 
 
 
 
 
 
 
 
Consolidated
 
$
2,668,981

 
10.05
%
 
$
2,430,671

 
9.01
%
BOKF, NA
 
1,946,247

 
7.38

 
1,849,769

 
6.89
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
 
 
Unrealized Gain (Loss) on
 
 
 
 
 
 
Available for Sale Securities
 
Investment Securities Transferred from AFS
 
Employee Benefit Plans
 
Loss on Effective Cash Flow Hedges
 
Total
Balance, December 31, 2010
 
$
122,494

 
$
—

 
$
(13,777
)
 
$
(878
)
 
$
107,839

Net change in unrealized gain (loss)
 
45,593

 
—

 
1,694

 
—

 
47,287

Transfer of net unrealized gain from AFS to investment securities
 
(12,999
)
 
12,999

 
—

 
—

 
—

Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
(1,357
)
 
—

 
—

 
(1,357
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
304

 
304

Net impairment losses recognized in earnings
 
23,507

 
—

 
—

 
—

 
23,507

Gain on available for sale securities, net
 
(34,144
)
 
—

 
—

 
—

 
(34,144
)
Other comprehensive income (loss), before income taxes
 
21,957

 
11,642

 
1,694

 
304

 
35,597

Federal and state income tax1
 
(8,711
)
 
(4,969
)
 
(659
)
 
(118
)
 
(14,457
)
Other comprehensive income (loss), net of income taxes
 
13,246

 
6,673

 
1,035

 
186

 
21,140

Balance, December 31, 2011
 
135,740

 
6,673

 
(12,742
)
 
(692
)
 
128,979

Net change in unrealized gain (loss)
 
58,921

 
—

 
7,276

 
—

 
66,197

Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
(6,601
)
 
—

 
—

 
(6,601
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
453

 
453

Net impairment losses recognized in earnings
 
7,351

 
—

 
—

 
—

 
7,351

Gain on available for sale securities, net
 
(33,845
)
 
—

 
—

 
—

 
(33,845
)
Other comprehensive income (loss), before income taxes
 
32,427

 
(6,601
)
 
7,276

 
453

 
33,555

Federal and state income tax1
 
(12,614
)
 
3,006

 
(2,830
)
 
(176
)
 
(12,614
)
Other comprehensive income (loss), net of income taxes
 
19,813

 
(3,595
)
 
4,446

 
277

 
20,941

Balance, December 31, 2012
 
155,553

 
3,078

 
(8,296
)
 
(415
)
 
149,920

Net change in unrealized gain (loss)
 
(284,104
)
 
—

 
8,159

 
—

 
(275,945
)
Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
(3,210
)
 
—

 
—

 
(3,210
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
262

 
262

Net impairment losses recognized in earnings
 
2,308

 
—

 
—

 
—

 
2,308

Gain on available for sale securities, net
 
(10,720
)
 
—

 
—

 
—

 
(10,720
)
Other comprehensive income (loss), before income taxes
 
(292,516
)
 
(3,210
)
 
8,159

 
262

 
(287,305
)
Federal and state income tax1
 
113,788

 
1,250

 
(3,174
)
 
(102
)
 
111,762

Other comprehensive income (loss), net of income taxes
 
(178,728
)
 
(1,960
)
 
4,985

 
160

 
(175,543
)
Balance, December 31, 2013
 
$
(23,175
)
 
$
1,118

 
$
(3,311
)
 
$
(255
)
 
$
(25,623
)

1 
Calculated using 39% effective tax rate.