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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
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 Requirement
 
Capital Conservation Buffer1
 
Minimum Capital Requirement Including Capital Conservation Buffer
 
December 31, 2016
 
December 31, 2015
Common equity Tier 1 Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.50%
 
2.50%
 
7.00%
 
2,834,532

 
11.21
%
 
$
2,842,193

 
12.13
%
BOKF, NA
 
4.50%
 
N/A
 
4.50%
 
2,609,450

 
10.65
%
 
2,385,323

 
10.26
%
Mobank2
 
4.50%
 
N/A
 
4.50%
 
54,616

 
10.03
%
 
N/A
 
N/A
Tier I Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
6.00%
 
2.50%
 
8.50%
 
$
2,834,532

 
11.21
%
 
$
2,842,193

 
12.13
%
BOKF, NA
 
6.00%
 
N/A
 
6.00%
 
2,609,450

 
10.65
%
 
2,385,323

 
10.26
%
Mobank2
 
6.00%
 
N/A
 
6.00%
 
54,616

 
10.03
%
 
N/A
 
N/A
Total Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 

 
 

 
 
 
 
Consolidated
 
8.00%
 
2.50%
 
10.50%
 
$
3,238,323

 
12.81
%
 
$
3,116,144

 
13.30
%
BOKF, NA
 
8.00%
 
N/A
 
8.00%
 
2,866,949

 
11.70
%
 
2,657,935

 
11.43
%
Mobank2
 
8.00%
 
N/A
 
8.00%
 
54,617

 
10.03
%
 
N/A
 
N/A
Leverage (Tier I Capital to Average Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.00%
 
N/A
 
4.00%
 
$
2,834,532

 
8.72
%
 
$
2,842,193

 
9.25
%
BOKF, NA
 
4.00%
 
N/A
 
4.00%
 
2,609,450

 
8.11
%
 
2,385,323

 
7.81
%
Mobank2
 
4.00%
 
N/A
 
4.00%
 
54,616

 
8.37
%
 
N/A
 
N/A

1 
Capital conservation buffer is effective January 1, 2016 and is phased in through 2019. The phased in capital conservation buffer at December 31, 2016 is 0.625%. The fully phased in requirement of 2.50% is included in the table above.
2 
Missouri Bank and Trust Company of Kansas City dba Mobank was acquired by BOK Financial effective December 1, 2016.
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, 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

Net change in unrealized gain (loss)
 
(41,333
)
 
—

 
(188
)
 
—

 
(41,521
)
Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
(112
)
 
—

 
—

 
(112
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
—

 
—

Net impairment losses recognized in earnings
 
—

 
—

 
—

 
—

 
—

Gain on available for sale securities, net
 
(11,675
)
 
—

 
—

 
—

 
(11,675
)
Other comprehensive income (loss), before income taxes
 
(53,008
)
 
(112
)
 
(188
)
 
—

 
(53,308
)
Federal and state income tax1
 
(20,637
)
 
(44
)
 
(73
)
 
—

 
(20,754
)
Other comprehensive income (loss), net of income taxes
 
(32,371
)

(68
)

(115
)

—


(32,554
)
Balance, December 31, 2016
 
$
(9,087
)
 
$
—

 
$
(1,880
)
 
$
—

 
$
(10,967
)

1 
Calculated using 39% effective tax rate.