XML 95 R84.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Derivative Financial Instruments - Schedule of Amounts Related to Non-Hedging Interest Rate and Commodity Derivatives (Detail) - Non Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Interest Rate Contract [Member] | Other Non-Interest Income [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | $ 370 | $ 435
Interest Rate Contract [Member] | Other Non-Interest Expense [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | (1) | 0
Commodity Contract [Member] | Other Non-Interest Income [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | 52 | 132
Foreign Currency Derivative Contracts [Member] | Other Non-Interest Income [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | $ 9 | $ 6

X
- Definition Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] + References No definition available. + Details
Name: | cfr_OtherNonInterestIncomeNonHedgingInterestRateDerivativesLineItems
Namespace Prefix: | cfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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