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Shareholders' Equity
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Shareholders' Equity [Text Block] Shareholders Equity

Preferred Stock
 
One billion shares of preferred stock with a par value of $0.00005 per share are authorized. The Series A Preferred Stock has no voting rights except as otherwise provided by Oklahoma corporate law and may be converted into one share of Common Stock for each 36 shares of Series A Preferred Stock at the option of the holder. Dividends are cumulative at an annual rate of ten percent of the $0.06 per share liquidation preference value when declared and are payable in cash. Aggregate liquidation preference is $15 million. No Series A Preferred Stock was outstanding in 2018, 2017 or 2016.
 
Common Stock
 
Common stock consists of 2.5 billion authorized shares with a $0.00006 par value. Holders of common shares are entitled to one vote per share at the election of the Board of Directors and on any question arising at any shareholders’ meeting and to receive dividends when and as declared. Additionally, regulations restrict the ability of national banks and bank holding companies to pay dividends.
 
Subsidiary Banks
 
The amounts of dividends that BOK Financial’s subsidiary banks can declare and the amounts of loans the subsidiary banks can extend to affiliates are limited by various federal banking regulations and state corporate law. Generally, dividends declared during a calendar year are limited to net profits, as defined, for the year plus retained profits for the preceding two years. The amounts of dividends are further restricted by minimum capital requirements. 

Regulatory Capital

BOK Financial and the subsidiary banks are subject to various capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and additional discretionary actions by regulators that could have a material effect on BOK Financial's operations. These capital requirements include quantitative measures of assets, liabilities and certain off-balance sheet items. The capital standards are also subject to qualitative judgments by the regulators.

New capital rules were effective for BOK Financial on January 1, 2015. Components of these rules will phase in through January 1, 2019. A bank falling below the minimum capital requirements, including the capital conservation buffer, would be subject to regulatory restrictions on capital distributions (including but not limited to dividends and share repurchases) and executive bonus payments. For a banking institution to qualify as well capitalized, Common Equity Tier 1, Tier I, Total and Leverage capital ratios must be at least 6.5%, 8%, 10% and 5%, respectively. Tier I capital consists primarily of common stockholders' equity, excluding unrealized gains or losses on available for sale securities, less goodwill, core deposit premiums and certain other intangible assets. Total capital consists primarily of Tier I capital plus preferred stock, subordinated debt and allowances for credit losses, subject to certain limitations. The subsidiary banks exceeded the regulatory definition of well capitalized as of December 31, 2018 and December 31, 2017.

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)

AOCI includes unrealized gains and losses on available for sale ("AFS") securities and non-credit related unrealized losses on AFS securities for which an other-than-temporary impairment has been recorded in earnings. AOCI also includes unrealized gains on AFS securities that were transferred from AFS to investment securities in 2011. Such amounts were amortized over the estimated remaining life of the security as an adjustment to yield, offsetting the related amortization of premium on the transferred securities. Unrealized losses on employee benefit plans will be reclassified into income as pension plan costs are recognized over the remaining service period of plan participants. Gains and losses in AOCI are net of deferred income taxes.

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.