XML 94 R82.htm IDEA: XBRL DOCUMENT
v3.19.2

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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
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) | $ 387 | $ 702 | $ 973 | $ 2,190
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) | 0 | 17 | 0 | (4)
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) | 110 | (54) | 213 | 36
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) | $ 12 | $ 91 | $ 29 | $ 150

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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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: |