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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Stockholders' Equity Note [Abstract]  
Summary of Regulatory Capital Levels [Table Text Block]
A summary of regulatory capital levels follows (dollars in thousands):
 
 
December 31,
 
 
2014
 
2013
Total Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
Consolidated
 
$
3,120,223

 
14.66
%
 
$
3,017,022

 
15.56
%
BOKF, NA
 
2,449,078

 
11.56

 
2,293,673

 
11.88

Tier I Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
Consolidated
 
$
2,838,129

 
13.33
%
 
$
2,668,981

 
13.77
%
BOKF, NA
 
2,168,161

 
10.24

 
1,946,247

 
10.08

Tier I Capital (to Average Assets):
 
 
 
 
 
 
 
 
Consolidated
 
$
2,838,129

 
9.96
%
 
$
2,668,981

 
10.05
%
BOKF, NA
 
2,168,161

 
7.65

 
1,946,247

 
7.38
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, 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
)
Net change in unrealized gain (loss)
 
136,050

 
—

 
725

 
—

 
136,775

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

 
(1,216
)
 
—

 
—

 
(1,216
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
296

 
296

Net impairment losses recognized in earnings
 
373

 
—

 
—

 
—

 
373

Gain on available for sale securities, net
 
(1,539
)
 
—

 
—

 
—

 
(1,539
)
Other comprehensive income (loss), before income taxes
 
134,884

 
(1,216
)
 
725

 
296

 
134,689

Federal and state income tax1
 
(52,470
)
 
474

 
(282
)
 
(115
)
 
(52,393
)
Other comprehensive income (loss), net of income taxes
 
82,414

 
(742
)
 
443

 
181

 
82,296

Balance, December 31, 2014
 
$
59,239

 
$
376

 
$
(2,868
)
 
$
(74
)
 
$
56,673


1 
Calculated using 39% effective tax rate.