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Balance Sheet Offsetting Balance Sheet Offsetting - Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase, Gross | $ 593,107 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | $ 791,119 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Remaining contractual maturity of the agreements overnight and continuous | 581,229 cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous | 782,589 cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous
Remaining contractual maturity of the agreements up to 30 Days | 0 cfr_Remainingcontractualmaturityoftheagreementsupto30Days | 0 cfr_Remainingcontractualmaturityoftheagreementsupto30Days
Remaining contractual maturity of the agreements 30 to 90 Days | 11,878 cfr_Remainingcontractualmaturityoftheagreements30to90Days | 8,530 cfr_Remainingcontractualmaturityoftheagreements30to90Days
Remaining contractual maturity of the agreements greater than 90 Days | 0 cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days | 0 cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days
Remaining contractual maturity of the agreements total | 593,107 cfr_Remainingcontractualmaturityoftheagreementstotal | 791,119 cfr_Remainingcontractualmaturityoftheagreementstotal
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement | 593,107 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement | 791,119 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement
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 | 363,374 cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 427,402 cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements up to 30 Days | 0 cfr_Remainingcontractualmaturityoftheagreementsupto30Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 0 cfr_Remainingcontractualmaturityoftheagreementsupto30Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements 30 to 90 Days | 0 cfr_Remainingcontractualmaturityoftheagreements30to90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 0 cfr_Remainingcontractualmaturityoftheagreements30to90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements greater than 90 Days | 0 cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 0 cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements total | 363,374 cfr_Remainingcontractualmaturityoftheagreementstotal / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 427,402 cfr_Remainingcontractualmaturityoftheagreementstotal / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
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 | 217,855 cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 355,187 cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements up to 30 Days | 0 cfr_Remainingcontractualmaturityoftheagreementsupto30Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 0 cfr_Remainingcontractualmaturityoftheagreementsupto30Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements 30 to 90 Days | 11,878 cfr_Remainingcontractualmaturityoftheagreements30to90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 8,530 cfr_Remainingcontractualmaturityoftheagreements30to90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements greater than 90 Days | 0 cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 0 cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements total | $ 229,733 cfr_Remainingcontractualmaturityoftheagreementstotal / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | $ 363,717 cfr_Remainingcontractualmaturityoftheagreementstotal / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 + Details
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- 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/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 + Details
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