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Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Mortgage Banking Revenue [Abstract]
Net realized gains on sale of mortgage loans	$ 26,000	$ 9,717
Net change in unrealized gain (loss) on mortgage loans held for sale	(6,955)	3,561
Net change in the fair value of mortgage loan commitments	(8,980)	19,017
Net change in the fair value of forward sales contracts	15,222	(10,725)
Total production revenue	25,287	21,570
Servicing revenue	11,826	15,597
Total mortgage banking revenue	$ 37,113	$ 37,167

X

- Definition

Represents the change in fair value of mortgage loan commitments during the period.

+ References

No definition available.

+ Details

Name:	bokf_Changeinfairvalueofmortgageloancommitments
Namespace Prefix:	bokf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the change in the fair value of forward sales commitments considered to be derivative instruments during the period.

+ References

No definition available.

+ Details

Name:	bokf_Changeinthefairvalueofforwardsalescommitments
Namespace Prefix:	bokf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Noninterest income derived from the sale and changes in fair value of residential mortgage loans held for sale and fees for servicing of residential mortgage loans held by third parties. Also includes changes in the fair value of residential mortgage loan commitments and forward sales commitments considered to be derivative instruments.

+ References

No definition available.

+ Details

Name:	bokf_MortgageBankingRevenue
Namespace Prefix:	bokf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Mortgage Banking Revenue [Abstract]

+ References

No definition available.

+ Details

Name:	bokf_MortgageBankingRevenueAbstract
Namespace Prefix:	bokf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total gain (loss) on mortgage loans held for sale, including mortgage loan commitments and forward sales contracts.

+ References

No definition available.

+ Details

Name:	bokf_MortgageProductionRevenue
Namespace Prefix:	bokf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Servicing fees for loans secured by real property.

+ References

No definition available.

+ Details

Name:	bokf_MortgageServicingFees
Namespace Prefix:	bokf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the net change in unrealized gain on mortgage loans held for sale under fair value option.

+ References

No definition available.

+ Details

Name:	bokf_Netchangeinunrealizedgainonmortgageloansheldforsale
Namespace Prefix:	bokf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121581245&loc=d3e21310-158488

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121581245&loc=d3e21286-158488

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=117337389&loc=d3e21493-158490

+ Details

Name:	us-gaap_GainLossOnSaleOfMortgageLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration