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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
 
December 31, 2018
Common Equity Tier 1 Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.50%
 
2.50%
 
7.00%
 
N/A
 
$
3,608,821

 
11.39
%
 
$
3,356,524

 
10.92
%
BOKF, NA
 
4.50%
 
N/A
 
4.50%
 
6.50%
 
3,414,446

 
10.90
%
 
2,894,119

 
10.50
%
CoBiz Bank2
 
4.50%
 
N/A
 
4.50%
 
6.50%
 
—

 
—
%
 
317,944

 
10.65
%
Tier I Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
6.00%
 
2.50%
 
8.50%
 
N/A
 
$
3,608,821

 
11.39
%
 
$
3,356,524

 
10.92
%
BOKF, NA
 
6.00%
 
N/A
 
6.00%
 
8.00%
 
3,414,446

 
10.90
%
 
2,894,119

 
10.50
%
CoBiz Bank2
 
6.00%
 
N/A
 
6.00%
 
8.00%
 
—

 
—
%
 
317,944

 
10.65
%
Total Capital (to Risk Weighted Assets):
 
 
 
 
 
 
 
 
 
 

 
 

 
 
 
 
Consolidated
 
8.00%
 
2.50%
 
10.50%
 
N/A
 
$
4,097,087

 
12.94
%
 
$
3,841,684

 
12.50
%
BOKF, NA
 
8.00%
 
N/A
 
8.00%
 
10.00%
 
3,692,010

 
11.79
%
 
3,103,366

 
11.26
%
CoBiz Bank2
 
8.00%
 
N/A
 
8.00%
 
10.00%
 
—

 
—
%
 
382,944

 
12.83
%
Leverage (Tier I Capital to Average Assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
4.00%
 
N/A
 
4.00%
 
N/A
 
$
3,608,820

 
8.40
%
 
$
3,356,524

 
8.96
%
BOKF, NA
 
4.00%
 
N/A
 
4.00%
 
5.00%
 
3,414,446

 
7.98
%
 
2,894,119

 
8.56
%
CoBiz Bank2
 
4.00%
 
N/A
 
4.00%
 
5.00%
 
—

 
—
%
 
317,944

 
8.25
%

1 
Capital conservation buffer was effective January 1, 2016 and phased in through 2019. The phased in capital conservation buffer was 2.50% at December 31, 2019 and 1.875% at December 31, 2018. 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 and merged into BOKF, NA during the first quarter of 2019.
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
 
Employee Benefit Plans
 
Total
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:
 
 
 
 
 
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:
 
 
 
 
 
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
)
Net change in unrealized gain (loss)
239,017

 
2,030

 
241,047

Reclassification adjustments included in earnings:
 
 
 
 
 
Gain on available for sale securities, net
(5,597
)
 
—

 
(5,597
)
Other comprehensive income (loss), before income taxes
233,420

 
2,030

 
235,450

Federal and state income tax2
57,425

 
517

 
57,942

Other comprehensive income (loss), net of income taxes
175,995


1,513


177,508

Balance, December 31, 2019
$
104,996

 
$
(73
)
 
$
104,923


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.