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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 186,337us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Held to Maturity, Due after one year through five years, Amortized Cost	491,938us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Held to Maturity, Due after five years through ten years, Amortized Cost	220,730us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
Held to Maturity, Due after ten years, Amortized Cost	1,911,007us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	7,499cfr_MortgageBackedSecuritiesHeldToMaturityNetCarryingAmount
Held-to-maturity Securities, Equity Securities, Amortized cost	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount
Held to Maturity, Amortized Cost	2,817,511us-gaap_HeldToMaturitySecurities	2,926,486us-gaap_HeldToMaturitySecurities
Held to Maturity, Due in one year or less, Estimated Fair Value	191,861us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Held to Maturity, Due after one year through five years, Estimated Fair Value	523,304us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Held to Maturity, Due after five years through ten years, Estimated Fair Value	222,875us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Held to Maturity, Due after ten years, Estimated Fair Value	1,921,052us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	7,612us-gaap_MortgageBackedSecuritiesHeldToMaturityFairValueDisclosure
Held-to-maturity Securities, Equity Securities, Fair Value	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
Held to Maturity, Estimated Fair Value	2,866,704us-gaap_HeldToMaturitySecuritiesFairValue	2,966,390us-gaap_HeldToMaturitySecuritiesFairValue
Available-for-sale Securities, Due in one year or less, Amortized Cost	14,228us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Available for Sale, Due after one year through five years, Amortized Cost	3,110,546us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Available for Sale, Due after five years through ten years, Amortized Cost	1,718,927us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Available for Sale, Due after ten years, Amortized Cost	2,296,409us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Available for Sale, Residential mortgage-backed securities, Amortized Cost	1,256,377cfr_MortgageBackedSecuritiesAvailableForSaleAmortizedCost
Available-for-sale Securities, Equity Securities, Amortized cost	42,404us-gaap_AvailableForSaleSecuritiesEquitySecurities
Available for Sale, Amortized Cost	8,438,891us-gaap_AvailableForSaleSecuritiesAmortizedCost	8,261,947us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for Sale, Due in one year or less, Estimated Fair Value	14,542us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Available for Sale, Due after one year through five years, Estimated Fair Value	3,146,176us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Available for Sale, Due after five years through ten years, Estimated Fair Value	1,778,335us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Available for Sale, Due after ten years, Estimated Fair Value	2,367,327us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	1,323,713us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
Available For Sale Securities Equity Securities Fair Value	42,404cfr_AvailableForSaleSecuritiesEquitySecuritiesFairValue
Available for Sale, Estimated Fair Value	$ 8,672,497us-gaap_AvailableForSaleSecurities	$ 8,461,254us-gaap_AvailableForSaleSecurities

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Available For Sale Securities Equity Securities Fair Value

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Mortgage-backed securities Available For Sale, Amortized Cost

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year.

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Amount of held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, over several maturity groupings.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity.

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