XML 101 R90.htm IDEA: XBRL DOCUMENT
v3.21.2

Balance Sheet Offsetting Balance Sheet Offsetting - Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | $ 2,216,889 | $ 2,068,147
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 | 2,216,889 | 2,068,147
Securities Sold under Agreements to Repurchase, Gross | 2,216,889 | 2,068,147
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 0 | 0
US Treasury Securities [Member] |  |
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | 1,197,365 | 692,860
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 | 1,197,365 | 692,860
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 | 1,019,524 | 1,375,287
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 | $ 1,019,524 | $ 1,375,287

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: | instant

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: | instant

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: | instant

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: | instant

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: | instant

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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + 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: |