XML 144 R127.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Balance Sheet Offsetting Balance Sheet Offsetting - Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | $ 4,342,941 | $ 4,127,188
Remaining contractual maturity of the agreements up to 30 Days | 0 | 0
Remaining contractual maturity of the agreements 30 to 90 Days | 0 | 0
Remaining contractual maturity of the agreements greater than 90 Days | 0 | 0
Remaining contractual maturity of the agreements total | 4,342,941 | 4,127,188
Securities Sold under Agreements to Repurchase, Gross | 4,342,941 | 4,127,188
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 0 | 0
US Treasury [Member] |  |
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | 2,170,482 | 3,300,662
Remaining contractual maturity of the agreements up to 30 Days | 0 | 0
Remaining contractual maturity of the agreements 30 to 90 Days | 0 | 0
Remaining contractual maturity of the agreements greater than 90 Days | 0 | 0
Remaining contractual maturity of the agreements total | 2,170,482 | 3,300,662
Residential Mortgage Backed Securities [Member] |  |
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | 2,172,459 | 826,526
Remaining contractual maturity of the agreements up to 30 Days | 0 | 0
Remaining contractual maturity of the agreements 30 to 90 Days | 0 | 0
Remaining contractual maturity of the agreements greater than 90 Days | 0 | 0
Remaining contractual maturity of the agreements total | $ 2,172,459 | $ 826,526

X
- Definition [Line Items] for Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Table] + References No definition available. + Details
Name: | cfr_RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchaseLineItems
Namespace Prefix: | cfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining contractual maturity of the agreements 30 to 90 Days + References No definition available. + Details
Name: | cfr_Remainingcontractualmaturityoftheagreements30to90Days
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Remaining contractual maturity of the agreements greater than 90 Days + References No definition available. + Details
Name: | cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Remaining contractual maturity of the agreements overnight and continuous + References No definition available. + Details
Name: | cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Remaining contractual maturity of the agreements total + References No definition available. + Details
Name: | cfr_Remainingcontractualmaturityoftheagreementstotal
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Remaining contractual maturity of the agreements up to 30 Days + References No definition available. + Details
Name: | cfr_Remainingcontractualmaturityoftheagreementsupto30Days
Namespace Prefix: | cfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of right to receive securities collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 55 -Paragraph 13 -SubTopic 20 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-13 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-20 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 + Details
Name: | us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-7 + Details
Name: | us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |