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Deposits - Additional Information About Corporation's Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Deposits [Abstract]
Deposits from the Certificate of Deposit Account Registry Service (CDARS)	$ 4,648	$ 22,229
Deposits from Promontory Interfinancial Network Insured Cash Sweep Service	15,313	148,665
Deposits from foreign sources (primarily Mexico)	$ 766,432	$ 744,295

X

- Definition

This element represents Certificate Of Deposit Account Registry Service (CDARS) deposits held

+ References

No definition available.

+ Details

Name:	cfr_CertificateOfDepositAccountRegistryServiceCdarsDepositsHeld
Namespace Prefix:	cfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Promontory Interfinancial Network Insured Cash Sweep Service

+ References

No definition available.

+ Details

Name:	cfr_PromontoryInterfinancialNetworkInsuredCashSweepService
Namespace Prefix:	cfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate of all foreign interest-bearing and noninterest-bearing deposit liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 235



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-05(a))



-URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537907-122884



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.12(a))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DepositsForeign
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant