XML 52 R43.htm IDEA: XBRL DOCUMENT
v3.23.1

Loans and Allowances for Credit Losses, Modifications (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |
Financing Receivable, Modified in Period, Amount | $ 35,000
Healthcare [Member] | Commercial [Member] |
Financing Receivable, Troubled Debt Restructuring [Line Items] |
Financing Receivable, Modified in Period, Amount | 26,000
US Government Agency Insured Loans [Member] | Residential mortgage [Member] | Loans to individuals [Member] |
Financing Receivable, Troubled Debt Restructuring [Line Items] |
Financing Receivable, Modified, Subsequent Default | 511
Financing Receivable, Modified in Period, Amount | $ 8,400

X
- Definition Financing Receivable, Modified in Period, Amount + References No definition available. + Details
Name: | bokf_FinancingReceivableModifiedInPeriodAmount
Namespace Prefix: | bokf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Modified, Subsequent Default + References No definition available. + Details
Name: | bokf_FinancingReceivableModifiedSubsequentDefault
Namespace Prefix: | bokf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HealthCareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=us-gaap_UsGovernmentAgencyInsuredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=bokf_LoanstoindividualsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |