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Reportable Segments
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Reportable Segments [Text Block] Reportable Segments

BOK Financial operates three principal lines of business: Commercial Banking, Consumer Banking and Wealth Management. Commercial Banking includes lending, treasury and cash management services and customer risk management products to small businesses, middle market and larger commercial customers. Commercial Banking also includes the TransFund EFT network. Consumer Banking includes retail lending and deposit services, lending and deposit services to small business customers served through the consumer branch network and all mortgage banking activities. Wealth Management provides fiduciary services, private bank services and investment advisory services in all markets. Wealth Management also underwrites state and municipal securities and engages in brokerage and trading activities.

In addition to its lines of business, BOK Financial has a Funds Management unit. The primary purpose of this unit is to manage overall liquidity needs and interest rate risk. Each line of business borrows funds from and provides funds to the Funds Management unit as needed to support their operations. Operating results for Funds Management and Other include the effect of interest rate risk positions and risk management activities, securities gains and losses including impairment charges, the provision for credit losses in excess of net loans charged off, tax planning strategies and certain executive compensation costs that are not attributed to the lines of business. 

BOK Financial allocates resources and evaluates performance of its lines of business after allocation of funds, actual net credit losses and capital costs. In addition, we measure the performance of our business lines after allocation of certain indirect expenses and taxes on statutory rates. The allocation for the prior comparable periods have been revised on a comparable basis.

The cost of funds borrowed from the Funds Management unit by the operating lines of business is transfer priced at rates that approximate market rates for funds with similar duration. Market rates are generally based on the applicable LIBOR or interest rate swap rates, adjusted for prepayment risk. This method of transfer-pricing funds that support assets of the operating lines of business tends to insulate them from interest rate risk.

The value of funds provided by the operating lines of business to the Funds Management unit is based on rates which approximate the wholesale market rates for funds with similar duration and re-pricing characteristics. Market rates are generally based on LIBOR or interest rate swap rates. The funds credit formula applied to deposit products with indeterminate maturities is established based on their re-pricing characteristics reflected in a combination of the short-term LIBOR rates and a moving average of an intermediate term swap rate, with an appropriate spread applied to both. Shorter duration products are weighted towards the short-term LIBOR rate and longer duration products are weighted towards intermediate swap rates. The expected duration ranges from 30 days for certain rate-sensitive deposits to five years.

Substantially all revenue is from domestic customers. No single external customer accounts for more than 10% of total revenue.

Net loans charged off and provision for credit losses represents net loans charged off as attributed to the lines of business and the provision for credit losses in excess of net charge-offs attributed to Funds Management and Other.

The operations of CoBiz, acquired on October 1, 2018 were not yet allocated to the operating segments at December 31, 2018. Accordingly, the operations, assets and liabilities of CoBiz were included in Funds Management and Other for 2018. The acquisition of Mobank on December 1, 2016 was allocated to the operating segments in 2017.

Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2018 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest and dividend revenue from external sources
 
$
726,856

 
$
83,231

 
$
81,527

 
$
93,253

 
$
984,867

Net interest revenue (expense) from internal sources
 
(156,254
)
 
73,448

 
31,505

 
51,301

 
—

Net interest and dividend revenue
 
570,602

 
156,679

 
113,032

 
144,554

 
984,867

Provision for credit losses
 
30,358

 
5,143

 
(288
)
 
(27,213
)
 
8,000

Net interest and dividend revenue after provision for credit losses
 
540,244

 
151,536

 
113,320

 
171,767

 
976,867

Other operating revenue
 
162,701

 
178,123

 
296,369

 
(20,409
)
 
616,784

Other operating expense
 
192,811

 
210,187

 
248,959

 
376,209

 
1,028,166

Net direct contribution
 
510,134

 
119,472

 
160,730

 
(224,851
)
 
565,485

Gain (loss) on financial instruments, net
 
26

 
(25,021
)
 
7

 
24,988

 
—

Change in fair value of mortgage servicing rights
 
—

 
4,668

 
—

 
(4,668
)
 
—

Gain (loss) on repossessed assets, net
 
(6,532
)
 
247

 
—

 
6,285

 
—

Corporate expense allocations
 
45,818

 
63,700

 
44,190

 
(153,708
)
 
—

Net income before taxes
 
457,810

 
35,666

 
116,547

 
(44,538
)
 
565,485

Federal and state income taxes
 
121,434

 
9,085

 
30,003

 
(41,461
)
 
119,061

Net income
 
336,376

 
26,581

 
86,544

 
(3,077
)
 
446,424

Net income attributable to non-controlling interests
 
—

 
—

 
—

 
778

 
778

Net income attributable to BOK Financial Corp. shareholders
 
$
336,376

 
$
26,581

 
$
86,544

 
$
(3,855
)
 
$
445,646

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
18,431,411

 
$
8,303,262

 
$
8,446,006

 
$
(243,149
)
 
$
34,937,530


Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2017 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest and dividend revenue from external sources
 
$
618,325

 
$
84,286

 
$
45,024

 
$
94,066

 
$
841,701

Net interest revenue (expense) from internal sources
 
(89,106
)
 
53,916

 
38,344

 
(3,154
)
 
—

Net interest and dividend revenue
 
529,219

 
138,202

 
83,368

 
90,912

 
841,701

Provision for credit losses
 
13,877

 
4,786

 
(696
)
 
(24,967
)
 
(7,000
)
Net interest and dividend revenue after provision for credit losses
 
515,342

 
133,416

 
84,064

 
115,879

 
848,701

Other operating revenue
 
208,404

 
184,878

 
301,434

 
378

 
695,094

Other operating expense
 
228,119

 
221,679

 
246,626

 
329,093

 
1,025,517

Net direct contribution
 
495,627

 
96,615

 
138,872

 
(212,836
)
 
518,278

Gain (loss) on financial instruments, net
 
52

 
(2,054
)
 
—

 
2,002

 
—

Change in fair value of mortgage servicing rights
 
—

 
172

 
—

 
(172
)
 
—

Gain (loss) on repossessed assets, net
 
(2,681
)
 
223

 
387

 
2,071

 
—

Corporate expense allocations
 
34,253

 
67,320

 
40,562

 
(142,135
)
 
—

Net income before taxes
 
458,745

 
27,636

 
98,697

 
(66,800
)
 
518,278

Federal and state income taxes
 
188,241

 
10,750

 
38,848

 
(55,246
)
 
182,593

Net income
 
270,504

 
16,886

 
59,849

 
(11,554
)
 
335,685

Net income attributable to non-controlling interests
 
—

 
—

 
—

 
1,041

 
1,041

Net income attributable to BOK Financial Corp. shareholders
 
$
270,504

 
$
16,886

 
$
59,849

 
$
(12,595
)
 
$
334,644

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
17,730,654

 
$
8,544,117

 
$
7,072,622

 
$
(399,899
)
 
$
32,947,494



Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2016 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest and dividend revenue from external sources
 
$
501,042

 
$
77,283

 
$
33,006

 
$
135,897

 
$
747,228

Net interest revenue (expense) from internal sources
 
(62,655
)
 
43,156

 
29,043

 
(9,544
)
 
—

Net interest and dividend revenue
 
438,387

 
120,439

 
62,049

 
126,353

 
747,228

Provision for credit losses
 
32,961

 
4,925

 
(801
)
 
27,915

 
65,000

Net interest and dividend revenue after provision for credit losses
 
405,426

 
115,514

 
62,850

 
98,438

 
682,228

Other operating revenue
 
198,902

 
216,285

 
283,222

 
(24,389
)
 
674,020

Other operating expense
 
217,993

 
247,478

 
250,995

 
301,124

 
1,017,590

Net direct contribution
 
386,335

 
84,321

 
95,077

 
(227,075
)
 
338,658

Gain (loss) on financial instruments, net
 
10

 
(26,252
)
 
(42
)
 
26,284

 
—

Change in fair value of mortgage servicing rights
 
—

 
(2,193
)
 
—

 
2,193

 
—

Gain on repossessed assets, net
 
669

 
979

 
—

 
(1,648
)
 
—

Corporate expense allocations
 
36,134

 
65,567

 
42,378

 
(144,079
)
 
—

Net income before taxes
 
350,880

 
(8,712
)
 
52,657

 
(56,167
)
 
338,658

Federal and state income taxes
 
146,740

 
(3,389
)
 
20,976

 
(57,950
)
 
106,377

Net income
 
204,140

 
(5,323
)
 
31,681

 
1,783

 
232,281

Net loss attributable to non-controlling interests
 
—

 
—

 
—

 
(387
)
 
(387
)
Net income attributable to BOK Financial Corp. shareholders
 
$
204,140

 
$
(5,323
)
 
$
31,681

 
$
2,170

 
$
232,668

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
17,175,325

 
$
8,254,666

 
$
7,373,080

 
$
(524,669
)
 
$
32,278,402