XML 92 R82.htm IDEA: XBRL DOCUMENT
v3.23.3

Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions (Detail) bbl in Thousands, MMBTU in Thousands, $ in Thousands | Sep. 30, 2023 USD ($) bbl MMBTU | Dec. 31, 2022 USD ($) MMBTU bbl
--- | --- | ---
Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 3,819 | 4,024
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 7,103 | 6,068
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 13,764 | $ 27,082
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (49,509) | $ (53,579)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 17,873 | 16,539
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 8,382 | 15,682
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 6,126 | $ 6,220
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (5,726) | $ (19,138)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 7,380 | 6,068
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 3,542 | 4,024
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 50,384 | $ 54,219
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (13,471) | $ (26,551)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 8,824 | 15,682
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 17,431 | 16,539
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 5,745 | $ 19,164
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (5,901) | $ (6,124)

X
- Definition Derivative, Assets Nonmonetary Notional Amount + References No definition available. + Details
Name: | cfr_DerivativeAssetsNonmonetaryNotionalAmount
Namespace Prefix: | cfr_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Derivative Instruments [Line Items] + References No definition available. + Details
Name: | cfr_DerivativeInstrumentsLineItems
Namespace Prefix: | cfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative, Liabilities Nonmonetary Notional Amount + References No definition available. + Details
Name: | cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount
Namespace Prefix: | cfr_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
Name: | us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
Name: | us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=cfr_FinancialInstitutionCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cfr_OilCommodityDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cfr_NaturalGasCommodityDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=cfr_CustomerCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |