XML 90 R79.htm IDEA: XBRL DOCUMENT
v3.5.0.2

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, 2016 USD ($) bbl MMBTU | Dec. 31, 2015 USD ($) bbl MMBTU
--- | --- | ---
Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 819 | 1,184
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 549 | 45
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 1,734 | $ 12,650
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (2,265) | $ (352)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 0 | 760
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 2,313 | 0
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 0 | $ 560
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (1,241) | $ 0
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 549 | 45
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 819 | 1,184
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 2,369 | $ 354
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (1,599) | $ (12,454)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 2,313 | 0
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 0 | 760
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 1,301 | $ 0
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ 0 | $ (549)

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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
Name: | us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_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: | us-gaap_CounterpartyNameAxis=cfr_CustomerCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |