XML 90 R78.htm IDEA: XBRL DOCUMENT
v3.19.2

Derivative Financial Instruments - Schedule of Weighted-Average Rates Paid and Received for Interest Rate Swaps Outstanding (Detail) | Jun. 30, 2019
--- | ---
Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Fair value hedge loan/lease interest rate swaps | 2.29%
Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Fair value hedge loan/lease interest rate swaps | 2.41%
Financial Institution Counterparties [Member] | Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – financial institution counterparties | 4.19%
Financial Institution Counterparties [Member] | Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – financial institution counterparties | 4.03%
Customer Counterparties [Member] | Weighted Average Interest Rate Paid [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – customer counterparties | 4.03%
Customer Counterparties [Member] | Weighted-Average Interest Rate Received [Member] |
Weighted Average Discount Rate [Line Items] |
Non-hedging interest rate swaps – customer counterparties | 4.19%

X
- Definition Fair Value Hedge Loan Lease Interest Rate Swaps + References No definition available. + Details
Name: | cfr_FairValueHedgeLoanLeaseInterestRateSwaps
Namespace Prefix: | cfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Non-hedging interest rate swaps + References No definition available. + Details
Name: | cfr_NonHedgingInterestRateSwaps
Namespace Prefix: | cfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Non-hedging interest rate swaps (2) + References No definition available. + Details
Name: | cfr_NonHedgingInterestRateSwaps2
Namespace Prefix: | cfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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_WeightedAverageDiscountRateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | srt_CounterpartyNameAxis=cfr_FinancialInstitutionCounterpartiesMember
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: |