Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net income	$ 277,977us-gaap_NetIncomeLoss	$ 237,866us-gaap_NetIncomeLoss	$ 237,952us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	16,314us-gaap_ProvisionForLoanAndLeaseLosses	20,582us-gaap_ProvisionForLoanAndLeaseLosses	10,080us-gaap_ProvisionForLoanAndLeaseLosses
Deferred tax expense (benefit)	(4,130)us-gaap_DeferredIncomeTaxExpenseBenefit	3,279us-gaap_DeferredIncomeTaxExpenseBenefit	(6,405)us-gaap_DeferredIncomeTaxExpenseBenefit
Accretion of loan discounts	(14,567)cfr_AccretionOfLoanDiscount	(12,654)cfr_AccretionOfLoanDiscount	(10,888)cfr_AccretionOfLoanDiscount
Securities premium amortization (discount accretion), net	61,268	41,921	21,701
Net (gain) loss on securities transactions	(38)us-gaap_GainLossOnSaleOfSecuritiesNet	(1,176)us-gaap_GainLossOnSaleOfSecuritiesNet	(4,314)us-gaap_GainLossOnSaleOfSecuritiesNet
Depreciation and amortization	39,694us-gaap_DepreciationAndAmortization	38,471us-gaap_DepreciationAndAmortization	37,776us-gaap_DepreciationAndAmortization
Net loss on sale/write-down of assets/foreclosed assets	761us-gaap_GainLossOnSaleOfOtherAssets	3,235us-gaap_GainLossOnSaleOfOtherAssets	4,603us-gaap_GainLossOnSaleOfOtherAssets
Stock-based compensation	12,503us-gaap_ShareBasedCompensation	11,963us-gaap_ShareBasedCompensation	12,836us-gaap_ShareBasedCompensation
Net tax benefit (deficiency) from stock-based compensation	19	(393)	(555)
Excess tax benefits from stock-based compensation	(3,183)	(2,686)	(171)
Earnings on life insurance policies	(3,218)us-gaap_OtherNoncashIncome	(3,103)us-gaap_OtherNoncashIncome	(4,038)us-gaap_OtherNoncashIncome
Net change in:
Trading account securities	972	14,686	(16,465)
Accrued interest receivable and other assets	(73,184)	(7,996)	48,176
Accrued interest payable and other liabilities	(24,518)	(170,389)	(30,289)
Net cash from operating activities	286,670	173,606	299,999
Investing Activities:
Securities held to maturity: Purchases	0	(257,571)	(237,503)
Securities held to maturity: Maturities, calls and principal repayments	153,523	14,891	2,100
Securities available for sale:
Purchases	(19,484,433)	(11,178,144)	(18,328,058)
Sales	12,151,287	10,056,060	16,587,482
Maturities, calls and principal repayments	4,987,629	1,311,643	1,073,122
Net change in loans	(800,120)	(317,987)	(1,241,422)
Net cash received (paid) in acquisitions	830,661	(1,896)	(7,199)
Proceeds from sales of premises and equipment	49	18,481	5,085
Purchases of premises and equipment	(131,970)	(39,599)	(24,891)
Proceeds from sales of repossessed properties	11,281	8,200	15,816
Net cash from investing activities	(2,282,093)	(385,922)	(2,155,468)
Financing Activities:
Net change in deposits	1,823,101us-gaap_IncreaseDecreaseInDeposits	1,191,420us-gaap_IncreaseDecreaseInDeposits	2,740,618us-gaap_IncreaseDecreaseInDeposits
Net change in short-term borrowings	84,677	107,192	(161,141)
Principal payments on long-term borrowings	0us-gaap_RepaymentsOfLongTermDebt	(7)us-gaap_RepaymentsOfLongTermDebt	(19)us-gaap_RepaymentsOfLongTermDebt
Proceeds from stock option exercises	29,158	68,653	10,516
Excess tax benefits from stock-based compensation	3,183	2,686	171
Proceeds from issuance of preferred stock	0	144,486	0
Purchase of treasury stock	(1,457)	(144,630)	(436)
Cash dividends paid on preferred stock	(8,063)	(6,719)	0
Cash dividends paid on common stock	(127,178)us-gaap_PaymentsOfDividendsCommonStock	(119,619)us-gaap_PaymentsOfDividendsCommonStock	(116,853)us-gaap_PaymentsOfDividendsCommonStock
Net cash from financing activities	1,803,421	1,243,462	2,472,856
Net change in cash and cash equivalents	(192,002)	1,031,146	617,387
Cash and cash equivalents at beginning of year	4,556,125	3,524,979	2,907,592
Cash and cash equivalents at end of year	$ 4,364,123	$ 4,556,125	$ 3,524,979

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