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Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Mortgage Banking Revenue [Abstract]
Net realized gains on sale of mortgage loans	$ 2,202	$ 2,085	$ 5,104	$ 6,449
Net change in unrealized gain (loss) on mortgage loans held for sale	(154)	(190)	1,255	59
Net change in the fair value of mortgage loan commitments	(345)	13	953	579
Net change in the fair value of forward sales contracts	667	(345)	(606)	370
Total mortgage production revenue	2,370	1,563	6,706	7,457
Servicing revenue	17,394	16,809	51,866	48,510
Total mortgage banking revenue	$ 19,764	$ 18,372	$ 58,572	$ 55,967

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 (loss) on mortgage loans held for sale under fair value option.

+ References

No definition available.

+ Details

Name:	bokf_NetChangeInUnrealizedGainLossOnMortgageLoansHeldForSale
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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-SubTopic 310
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-SubTopic 310
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 310
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477363/944-310-50-1

+ Details

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