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Earnings Per Common Share (Basic and Diluted Earnings Per Common Share) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 277,977us-gaap_NetIncomeLoss	$ 237,866us-gaap_NetIncomeLoss	$ 237,952us-gaap_NetIncomeLoss
Less: Preferred stock dividends	8,063us-gaap_PreferredStockDividendsAndOtherAdjustments	6,719us-gaap_PreferredStockDividendsAndOtherAdjustments	0us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income available to common shareholders	269,914us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	231,147us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	237,952us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Less: Earnings allocated to participating securities	1,001us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities	850us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities	773us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities
Net earnings allocated to common stock	268,913cfr_NetIncomeLossAvailableToCommonStockAfterParticipatingSecuritiesAllocation	230,297cfr_NetIncomeLossAvailableToCommonStockAfterParticipatingSecuritiesAllocation	237,179cfr_NetIncomeLossAvailableToCommonStockAfterParticipatingSecuritiesAllocation
Distributed earnings allocated to common stock	126,709us-gaap_DistributedEarnings	119,177us-gaap_DistributedEarnings	116,472us-gaap_DistributedEarnings
Undistributed earnings allocated to common stock	142,204us-gaap_UndistributedEarnings	111,120us-gaap_UndistributedEarnings	120,707us-gaap_UndistributedEarnings
Net earnings allocated to common stock	$ 268,913cfr_NetIncomeLossAvailableToCommonStockAfterParticipatingSecuritiesAllocation	$ 230,297cfr_NetIncomeLossAvailableToCommonStockAfterParticipatingSecuritiesAllocation	$ 237,179cfr_NetIncomeLossAvailableToCommonStockAfterParticipatingSecuritiesAllocation
Weighted-average shares outstanding for basic earnings per common share	62,072,080us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	60,350,552us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	61,298,041us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock compensation	901,448us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	765,858us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	345,341us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted-average shares outstanding for diluted earnings per common share	62,973,528us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	61,116,410us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	61,643,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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