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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Summary of Regulatory Capital Levels [Table Text Block]
A summary of regulatory capital minimum requirements and levels follows (dollars in thousands):
 
 
Minimum Capital Requirement1
 
Capital Conservation Buffer2
 
Minimum Capital Requirement Including Capital Conservation Buffer
 
December 31, 2015
Total Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.50%
 
2.50%
 
7.00%
 
$
3,116,144

 
13.30
%
BOKF, NA
 
4.50%
 
N/A
 
4.50%
 
2,657,935

 
11.43
%
Common equity Tier 1 Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
Consolidated
 
6.00%
 
2.50%
 
8.50%
 
2,842,193

 
12.13
%
BOKF, NA
 
6.00%
 
N/A
 
6.00%
 
2,385,323

 
10.26
%
Tier I Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
Consolidated
 
8.00%
 
2.50%
 
10.50%
 
$
2,842,193

 
12.13
%
BOKF, NA
 
8.00%
 
N/A
 
8.00%
 
2,385,323

 
10.26
%
Tier I Capital (to Average Assets):
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.00%
 
N/A
 
4.00%
 
$
2,842,193

 
9.25
%
BOKF, NA
 
4.00%
 
N/A
 
4.00%
 
2,385,323

 
7.81
%

1 
Effective January 1, 2015
2 
Effective January 1, 2016

A summary of regulatory capital levels under then current capital rules follows as of December 31, 2014 (dollars in thousands):
 
 
 
 
 
2014
Total Capital (to Risk Weighted Assets):
 
 
 
 
Consolidated
 
$
3,120,223

 
14.66
%
BOKF, NA
 
2,449,078

 
11.56
%
Tier I Capital (to Risk Weighted Assets):
 
 
 
 
Consolidated
 
$
2,838,129

 
13.33
%
BOKF, NA
 
2,168,161

 
10.24
%
Tier I Capital (to Average Assets):
 
 
 
 
Consolidated
 
$
2,838,129

 
9.96
%
BOKF, NA
 
2,168,161

 
7.65
%
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, 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

Net change in unrealized gain (loss)
 
(48,607
)
 
—

 
1,804

 
—

 
(46,803
)
Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
(503
)
 
—

 
—

 
(503
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
121

 
121

Net impairment losses recognized in earnings
 
1,819

 
—

 
—

 
—

 
1,819

Gain on available for sale securities, net
 
(12,058
)
 
—

 
—

 
—

 
(12,058
)
Other comprehensive income (loss), before income taxes
 
(58,846
)
 
(503
)
 
1,804

 
121

 
(57,424
)
Federal and state income tax1
 
(22,891
)
 
(195
)
 
701

 
47

 
(22,338
)
Other comprehensive income (loss), net of income taxes
 
(35,955
)

(308
)

1,103


74


(35,086
)
Balance, December 31, 2015
 
$
23,284

 
$
68

 
$
(1,765
)
 
$
—

 
$
21,587


1 
Calculated using 39% effective tax rate.