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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
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
 
Well Capitalized Bank Requirement
 
December 31, 2018
 
December 31, 2017
Common Equity Tier 1 Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.50%
 
2.50%
 
7.00%
 
N/A
 
$
3,356,524

 
10.92
%
 
$
3,074,981

 
12.05
%
BOKF, NA
 
4.50%
 
N/A
 
4.50%
 
6.50%
 
2,894,119

 
10.50
%
 
2,870,694

 
11.34
%
CoBiz Bank2
 
4.50%
 
N/A
 
4.50%
 
6.50%
 
317,944

 
10.65
%
 
399,768

 
12.19
%
Tier I Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
6.00%
 
2.50%
 
8.50%
 
N/A
 
$
3,356,524

 
10.92
%
 
$
3,074,981

 
12.05
%
BOKF, NA
 
6.00%
 
N/A
 
6.00%
 
8.00%
 
2,894,119

 
10.50
%
 
2,870,694

 
11.34
%
CoBiz Bank2
 
6.00%
 
N/A
 
6.00%
 
8.00%
 
317,944

 
10.65
%
 
399,768

 
12.19
%
Total Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 

 
 

 
 
 
 
Consolidated
 
8.00%
 
2.50%
 
10.50%
 
N/A
 
$
3,841,684

 
12.50
%
 
$
3,455,709

 
13.54
%
BOKF, NA
 
8.00%
 
N/A
 
8.00%
 
10.00%
 
3,103,366

 
11.26
%
 
3,105,117

 
12.27
%
CoBiz Bank2
 
8.00%
 
N/A
 
8.00%
 
10.00%
 
382,944

 
12.83
%
 
434,012

 
13.23
%
Leverage (Tier I Capital to Average Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.00%
 
N/A
 
4.00%
 
N/A
 
$
3,356,524

 
8.96
%
 
$
3,074,981

 
9.31
%
BOKF, NA
 
4.00%
 
N/A
 
4.00%
 
5.00%
 
2,894,119

 
8.56
%
 
2,870,694

 
8.73
%
CoBiz Bank2
 
4.00%
 
N/A
 
4.00%
 
5.00%
 
317,944

 
8.25
%
 
399,768

 
10.47
%

1 
Capital conservation buffer is effective January 1, 2016 and is phased in through 2019. The phased in capital conservation buffer was 1.875% at December 31, 2018 and 1.25% at December 31, 2017. The fully phased in requirement of 2.50% is included in the table above.
2 
CoBiz Bank was acquired by BOK Financial effective October 1, 2018.
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
 
Total
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
)
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
)
Net change in unrealized gain (loss)
 
(28,170
)
 
—

 
2,018

 
(26,152
)
Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
—

 
—

 
—

Gain on available for sale securities, net
 
(4,428
)
 
—

 
—

 
(4,428
)
Other comprehensive income (loss), before income taxes
 
(32,598
)
 
—

 
2,018

 
(30,580
)
Federal and state income tax1
 
(12,708
)
 
—

 
785

 
(11,923
)
Other comprehensive income (loss), net of income taxes
 
(19,890
)

—


1,233


(18,657
)
Reclassification of stranded accumulated other comprehensive loss related to tax reform
 
(6,408
)
 
—

 
(142
)
 
(6,550
)
Balance, December 31, 2017
 
(35,385
)
 
—

 
(789
)
 
(36,174
)
Transition adjustment for net unrealized gains on equity securities
 
(2,709
)
 
—

 
—

 
(2,709
)
Net change in unrealized gain (loss)
 
(46,941
)
 
—

 
(1,069
)
 
(48,010
)
Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
—

 
—

 
—

Loss on available for sale securities, net
 
2,801

 
—

 
—

 
2,801

Other comprehensive income (loss), before income taxes
 
(44,140
)
 
—

 
(1,069
)
 
(45,209
)
Federal and state income tax2
 
(11,235
)
 
—

 
(272
)
 
(11,507
)
Other comprehensive income (loss), net of income taxes
 
(32,905
)

—


(797
)

(33,702
)
Balance, December 31, 2018
 
$
(70,999
)
 
$
—

 
$
(1,586
)
 
$
(72,585
)

1 
Calculated using a 39 percent blended federal and state statutory tax rate.
2 
Calculated using a 25 percent blended federal and state statutory tax rate.