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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 $ 593,107us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross $ 791,119us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Remaining contractual maturity of the agreements overnight and continuous 581,229cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous 782,589cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous
Remaining contractual maturity of the agreements up to 30 Days 0cfr_Remainingcontractualmaturityoftheagreementsupto30Days 0cfr_Remainingcontractualmaturityoftheagreementsupto30Days
Remaining contractual maturity of the agreements 30 to 90 Days 11,878cfr_Remainingcontractualmaturityoftheagreements30to90Days 8,530cfr_Remainingcontractualmaturityoftheagreements30to90Days
Remaining contractual maturity of the agreements greater than 90 Days 0cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days 0cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days
Remaining contractual maturity of the agreements total 593,107cfr_Remainingcontractualmaturityoftheagreementstotal 791,119cfr_Remainingcontractualmaturityoftheagreementstotal
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement 593,107us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseNotSubjectToMasterNettingArrangement 791,119us-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 363,374cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 427,402cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements up to 30 Days 0cfr_Remainingcontractualmaturityoftheagreementsupto30Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 0cfr_Remainingcontractualmaturityoftheagreementsupto30Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements 30 to 90 Days 0cfr_Remainingcontractualmaturityoftheagreements30to90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 0cfr_Remainingcontractualmaturityoftheagreements30to90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements greater than 90 Days 0cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 0cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Remaining contractual maturity of the agreements total 363,374cfr_Remainingcontractualmaturityoftheagreementstotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 427,402cfr_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 217,855cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 355,187cfr_Remainingcontractualmaturityoftheagreementsovernightandcontinuous
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements up to 30 Days 0cfr_Remainingcontractualmaturityoftheagreementsupto30Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 0cfr_Remainingcontractualmaturityoftheagreementsupto30Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements 30 to 90 Days 11,878cfr_Remainingcontractualmaturityoftheagreements30to90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 8,530cfr_Remainingcontractualmaturityoftheagreements30to90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements greater than 90 Days 0cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 0cfr_Remainingcontractualmaturityoftheagreementsgreaterthan90Days
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Remaining contractual maturity of the agreements total $ 229,733cfr_Remainingcontractualmaturityoftheagreementstotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 $ 363,717cfr_Remainingcontractualmaturityoftheagreementstotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember